root/sound/core/oss/pcm_oss.c

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DEFINITIONS

This source file includes following definitions.
  1. snd_interval_refine_min
  2. snd_interval_refine_max
  3. snd_interval_refine_set
  4. snd_pcm_hw_param_value_min
  5. snd_pcm_hw_param_value_max
  6. _snd_pcm_hw_param_mask
  7. snd_pcm_hw_param_mask
  8. _snd_pcm_hw_param_min
  9. snd_pcm_hw_param_min
  10. _snd_pcm_hw_param_max
  11. snd_pcm_hw_param_max
  12. boundary_sub
  13. boundary_lt
  14. boundary_nearer
  15. snd_pcm_hw_param_near
  16. _snd_pcm_hw_param_set
  17. snd_pcm_hw_param_set
  18. _snd_pcm_hw_param_setinteger
  19. snd_pcm_oss_plugin_clear
  20. snd_pcm_plugin_insert
  21. snd_pcm_plugin_append
  22. snd_pcm_oss_bytes
  23. snd_pcm_alsa_frames
  24. get_hw_ptr_period
  25. snd_pcm_oss_format_from
  26. snd_pcm_oss_format_to
  27. snd_pcm_oss_period_size
  28. choose_rate
  29. lock_params
  30. unlock_params
  31. snd_pcm_oss_change_params_locked
  32. snd_pcm_oss_change_params
  33. snd_pcm_oss_get_active_substream
  34. snd_pcm_oss_prepare
  35. snd_pcm_oss_make_ready
  36. snd_pcm_oss_make_ready_locked
  37. snd_pcm_oss_capture_position_fixup
  38. snd_pcm_oss_write3
  39. snd_pcm_oss_read3
  40. snd_pcm_oss_writev3
  41. snd_pcm_oss_readv3
  42. snd_pcm_oss_write2
  43. snd_pcm_oss_write1
  44. snd_pcm_oss_read2
  45. snd_pcm_oss_read1
  46. snd_pcm_oss_reset
  47. snd_pcm_oss_post
  48. snd_pcm_oss_sync1
  49. snd_pcm_oss_sync
  50. snd_pcm_oss_set_rate
  51. snd_pcm_oss_get_rate
  52. snd_pcm_oss_set_channels
  53. snd_pcm_oss_get_channels
  54. snd_pcm_oss_get_block_size
  55. snd_pcm_oss_get_formats
  56. snd_pcm_oss_set_format
  57. snd_pcm_oss_get_format
  58. snd_pcm_oss_set_subdivide1
  59. snd_pcm_oss_set_subdivide
  60. snd_pcm_oss_set_fragment1
  61. snd_pcm_oss_set_fragment
  62. snd_pcm_oss_nonblock
  63. snd_pcm_oss_get_caps1
  64. snd_pcm_oss_get_caps
  65. snd_pcm_oss_simulate_fill
  66. snd_pcm_oss_set_trigger
  67. snd_pcm_oss_get_trigger
  68. snd_pcm_oss_get_odelay
  69. snd_pcm_oss_get_ptr
  70. snd_pcm_oss_get_space
  71. snd_pcm_oss_get_mapbuf
  72. strip_task_path
  73. snd_pcm_oss_look_for_setup
  74. snd_pcm_oss_release_substream
  75. snd_pcm_oss_init_substream
  76. snd_pcm_oss_release_file
  77. snd_pcm_oss_open_file
  78. snd_task_name
  79. snd_pcm_oss_open
  80. snd_pcm_oss_release
  81. snd_pcm_oss_ioctl
  82. snd_pcm_oss_ioctl_compat
  83. snd_pcm_oss_read
  84. snd_pcm_oss_write
  85. snd_pcm_oss_playback_ready
  86. snd_pcm_oss_capture_ready
  87. snd_pcm_oss_poll
  88. snd_pcm_oss_mmap
  89. snd_pcm_oss_proc_read
  90. snd_pcm_oss_proc_free_setup_list
  91. snd_pcm_oss_proc_write
  92. snd_pcm_oss_proc_init
  93. snd_pcm_oss_proc_done
  94. register_oss_dsp
  95. snd_pcm_oss_register_minor
  96. snd_pcm_oss_disconnect_minor
  97. snd_pcm_oss_unregister_minor
  98. alsa_pcm_oss_init
  99. alsa_pcm_oss_exit

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer / OSS compatible
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6 
   7 #if 0
   8 #define PLUGIN_DEBUG
   9 #endif
  10 #if 0
  11 #define OSS_DEBUG
  12 #endif
  13 
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched/signal.h>
  17 #include <linux/time.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/module.h>
  20 #include <linux/math64.h>
  21 #include <linux/string.h>
  22 #include <linux/compat.h>
  23 #include <sound/core.h>
  24 #include <sound/minors.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include "pcm_plugin.h"
  28 #include <sound/info.h>
  29 #include <linux/soundcard.h>
  30 #include <sound/initval.h>
  31 #include <sound/mixer_oss.h>
  32 
  33 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  34 
  35 static int dsp_map[SNDRV_CARDS];
  36 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  37 static bool nonblock_open = 1;
  38 
  39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  40 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  41 MODULE_LICENSE("GPL");
  42 module_param_array(dsp_map, int, NULL, 0444);
  43 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  44 module_param_array(adsp_map, int, NULL, 0444);
  45 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  46 module_param(nonblock_open, bool, 0644);
  47 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  48 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  49 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  50 
  51 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  52 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  53 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  54 
  55 /*
  56  * helper functions to process hw_params
  57  */
  58 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  59 {
  60         int changed = 0;
  61         if (i->min < min) {
  62                 i->min = min;
  63                 i->openmin = openmin;
  64                 changed = 1;
  65         } else if (i->min == min && !i->openmin && openmin) {
  66                 i->openmin = 1;
  67                 changed = 1;
  68         }
  69         if (i->integer) {
  70                 if (i->openmin) {
  71                         i->min++;
  72                         i->openmin = 0;
  73                 }
  74         }
  75         if (snd_interval_checkempty(i)) {
  76                 snd_interval_none(i);
  77                 return -EINVAL;
  78         }
  79         return changed;
  80 }
  81 
  82 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
  83 {
  84         int changed = 0;
  85         if (i->max > max) {
  86                 i->max = max;
  87                 i->openmax = openmax;
  88                 changed = 1;
  89         } else if (i->max == max && !i->openmax && openmax) {
  90                 i->openmax = 1;
  91                 changed = 1;
  92         }
  93         if (i->integer) {
  94                 if (i->openmax) {
  95                         i->max--;
  96                         i->openmax = 0;
  97                 }
  98         }
  99         if (snd_interval_checkempty(i)) {
 100                 snd_interval_none(i);
 101                 return -EINVAL;
 102         }
 103         return changed;
 104 }
 105 
 106 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 107 {
 108         struct snd_interval t;
 109         t.empty = 0;
 110         t.min = t.max = val;
 111         t.openmin = t.openmax = 0;
 112         t.integer = 1;
 113         return snd_interval_refine(i, &t);
 114 }
 115 
 116 /**
 117  * snd_pcm_hw_param_value_min
 118  * @params: the hw_params instance
 119  * @var: parameter to retrieve
 120  * @dir: pointer to the direction (-1,0,1) or NULL
 121  *
 122  * Return the minimum value for field PAR.
 123  */
 124 static unsigned int
 125 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 126                            snd_pcm_hw_param_t var, int *dir)
 127 {
 128         if (hw_is_mask(var)) {
 129                 if (dir)
 130                         *dir = 0;
 131                 return snd_mask_min(hw_param_mask_c(params, var));
 132         }
 133         if (hw_is_interval(var)) {
 134                 const struct snd_interval *i = hw_param_interval_c(params, var);
 135                 if (dir)
 136                         *dir = i->openmin;
 137                 return snd_interval_min(i);
 138         }
 139         return -EINVAL;
 140 }
 141 
 142 /**
 143  * snd_pcm_hw_param_value_max
 144  * @params: the hw_params instance
 145  * @var: parameter to retrieve
 146  * @dir: pointer to the direction (-1,0,1) or NULL
 147  *
 148  * Return the maximum value for field PAR.
 149  */
 150 static unsigned int
 151 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 152                            snd_pcm_hw_param_t var, int *dir)
 153 {
 154         if (hw_is_mask(var)) {
 155                 if (dir)
 156                         *dir = 0;
 157                 return snd_mask_max(hw_param_mask_c(params, var));
 158         }
 159         if (hw_is_interval(var)) {
 160                 const struct snd_interval *i = hw_param_interval_c(params, var);
 161                 if (dir)
 162                         *dir = - (int) i->openmax;
 163                 return snd_interval_max(i);
 164         }
 165         return -EINVAL;
 166 }
 167 
 168 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 169                                   snd_pcm_hw_param_t var,
 170                                   const struct snd_mask *val)
 171 {
 172         int changed;
 173         changed = snd_mask_refine(hw_param_mask(params, var), val);
 174         if (changed > 0) {
 175                 params->cmask |= 1 << var;
 176                 params->rmask |= 1 << var;
 177         }
 178         return changed;
 179 }
 180 
 181 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 182                                  struct snd_pcm_hw_params *params,
 183                                  snd_pcm_hw_param_t var,
 184                                  const struct snd_mask *val)
 185 {
 186         int changed = _snd_pcm_hw_param_mask(params, var, val);
 187         if (changed < 0)
 188                 return changed;
 189         if (params->rmask) {
 190                 int err = snd_pcm_hw_refine(pcm, params);
 191                 if (err < 0)
 192                         return err;
 193         }
 194         return 0;
 195 }
 196 
 197 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 198                                  snd_pcm_hw_param_t var, unsigned int val,
 199                                  int dir)
 200 {
 201         int changed;
 202         int open = 0;
 203         if (dir) {
 204                 if (dir > 0) {
 205                         open = 1;
 206                 } else if (dir < 0) {
 207                         if (val > 0) {
 208                                 open = 1;
 209                                 val--;
 210                         }
 211                 }
 212         }
 213         if (hw_is_mask(var))
 214                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 215                                               val + !!open);
 216         else if (hw_is_interval(var))
 217                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 218                                                   val, open);
 219         else
 220                 return -EINVAL;
 221         if (changed > 0) {
 222                 params->cmask |= 1 << var;
 223                 params->rmask |= 1 << var;
 224         }
 225         return changed;
 226 }
 227 
 228 /**
 229  * snd_pcm_hw_param_min
 230  * @pcm: PCM instance
 231  * @params: the hw_params instance
 232  * @var: parameter to retrieve
 233  * @val: minimal value
 234  * @dir: pointer to the direction (-1,0,1) or NULL
 235  *
 236  * Inside configuration space defined by PARAMS remove from PAR all 
 237  * values < VAL. Reduce configuration space accordingly.
 238  * Return new minimum or -EINVAL if the configuration space is empty
 239  */
 240 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 241                                 struct snd_pcm_hw_params *params,
 242                                 snd_pcm_hw_param_t var, unsigned int val,
 243                                 int *dir)
 244 {
 245         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 246         if (changed < 0)
 247                 return changed;
 248         if (params->rmask) {
 249                 int err = snd_pcm_hw_refine(pcm, params);
 250                 if (err < 0)
 251                         return err;
 252         }
 253         return snd_pcm_hw_param_value_min(params, var, dir);
 254 }
 255 
 256 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 257                                  snd_pcm_hw_param_t var, unsigned int val,
 258                                  int dir)
 259 {
 260         int changed;
 261         int open = 0;
 262         if (dir) {
 263                 if (dir < 0) {
 264                         open = 1;
 265                 } else if (dir > 0) {
 266                         open = 1;
 267                         val++;
 268                 }
 269         }
 270         if (hw_is_mask(var)) {
 271                 if (val == 0 && open) {
 272                         snd_mask_none(hw_param_mask(params, var));
 273                         changed = -EINVAL;
 274                 } else
 275                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 276                                                       val - !!open);
 277         } else if (hw_is_interval(var))
 278                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 279                                                   val, open);
 280         else
 281                 return -EINVAL;
 282         if (changed > 0) {
 283                 params->cmask |= 1 << var;
 284                 params->rmask |= 1 << var;
 285         }
 286         return changed;
 287 }
 288 
 289 /**
 290  * snd_pcm_hw_param_max
 291  * @pcm: PCM instance
 292  * @params: the hw_params instance
 293  * @var: parameter to retrieve
 294  * @val: maximal value
 295  * @dir: pointer to the direction (-1,0,1) or NULL
 296  *
 297  * Inside configuration space defined by PARAMS remove from PAR all 
 298  *  values >= VAL + 1. Reduce configuration space accordingly.
 299  *  Return new maximum or -EINVAL if the configuration space is empty
 300  */
 301 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 302                                 struct snd_pcm_hw_params *params,
 303                                 snd_pcm_hw_param_t var, unsigned int val,
 304                                 int *dir)
 305 {
 306         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 307         if (changed < 0)
 308                 return changed;
 309         if (params->rmask) {
 310                 int err = snd_pcm_hw_refine(pcm, params);
 311                 if (err < 0)
 312                         return err;
 313         }
 314         return snd_pcm_hw_param_value_max(params, var, dir);
 315 }
 316 
 317 static int boundary_sub(int a, int adir,
 318                         int b, int bdir,
 319                         int *c, int *cdir)
 320 {
 321         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 322         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 323         *c = a - b;
 324         *cdir = adir - bdir;
 325         if (*cdir == -2) {
 326                 (*c)--;
 327         } else if (*cdir == 2) {
 328                 (*c)++;
 329         }
 330         return 0;
 331 }
 332 
 333 static int boundary_lt(unsigned int a, int adir,
 334                        unsigned int b, int bdir)
 335 {
 336         if (adir < 0) {
 337                 a--;
 338                 adir = 1;
 339         } else if (adir > 0)
 340                 adir = 1;
 341         if (bdir < 0) {
 342                 b--;
 343                 bdir = 1;
 344         } else if (bdir > 0)
 345                 bdir = 1;
 346         return a < b || (a == b && adir < bdir);
 347 }
 348 
 349 /* Return 1 if min is nearer to best than max */
 350 static int boundary_nearer(int min, int mindir,
 351                            int best, int bestdir,
 352                            int max, int maxdir)
 353 {
 354         int dmin, dmindir;
 355         int dmax, dmaxdir;
 356         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 357         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 358         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 359 }
 360 
 361 /**
 362  * snd_pcm_hw_param_near
 363  * @pcm: PCM instance
 364  * @params: the hw_params instance
 365  * @var: parameter to retrieve
 366  * @best: value to set
 367  * @dir: pointer to the direction (-1,0,1) or NULL
 368  *
 369  * Inside configuration space defined by PARAMS set PAR to the available value
 370  * nearest to VAL. Reduce configuration space accordingly.
 371  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 372  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 373  * Return the value found.
 374   */
 375 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 376                                  struct snd_pcm_hw_params *params,
 377                                  snd_pcm_hw_param_t var, unsigned int best,
 378                                  int *dir)
 379 {
 380         struct snd_pcm_hw_params *save = NULL;
 381         int v;
 382         unsigned int saved_min;
 383         int last = 0;
 384         int min, max;
 385         int mindir, maxdir;
 386         int valdir = dir ? *dir : 0;
 387         /* FIXME */
 388         if (best > INT_MAX)
 389                 best = INT_MAX;
 390         min = max = best;
 391         mindir = maxdir = valdir;
 392         if (maxdir > 0)
 393                 maxdir = 0;
 394         else if (maxdir == 0)
 395                 maxdir = -1;
 396         else {
 397                 maxdir = 1;
 398                 max--;
 399         }
 400         save = kmalloc(sizeof(*save), GFP_KERNEL);
 401         if (save == NULL)
 402                 return -ENOMEM;
 403         *save = *params;
 404         saved_min = min;
 405         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 406         if (min >= 0) {
 407                 struct snd_pcm_hw_params *params1;
 408                 if (max < 0)
 409                         goto _end;
 410                 if ((unsigned int)min == saved_min && mindir == valdir)
 411                         goto _end;
 412                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 413                 if (params1 == NULL) {
 414                         kfree(save);
 415                         return -ENOMEM;
 416                 }
 417                 *params1 = *save;
 418                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 419                 if (max < 0) {
 420                         kfree(params1);
 421                         goto _end;
 422                 }
 423                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 424                         *params = *params1;
 425                         last = 1;
 426                 }
 427                 kfree(params1);
 428         } else {
 429                 *params = *save;
 430                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 431                 if (max < 0) {
 432                         kfree(save);
 433                         return max;
 434                 }
 435                 last = 1;
 436         }
 437  _end:
 438         kfree(save);
 439         if (last)
 440                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 441         else
 442                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 443         return v;
 444 }
 445 
 446 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 447                                  snd_pcm_hw_param_t var, unsigned int val,
 448                                  int dir)
 449 {
 450         int changed;
 451         if (hw_is_mask(var)) {
 452                 struct snd_mask *m = hw_param_mask(params, var);
 453                 if (val == 0 && dir < 0) {
 454                         changed = -EINVAL;
 455                         snd_mask_none(m);
 456                 } else {
 457                         if (dir > 0)
 458                                 val++;
 459                         else if (dir < 0)
 460                                 val--;
 461                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 462                 }
 463         } else if (hw_is_interval(var)) {
 464                 struct snd_interval *i = hw_param_interval(params, var);
 465                 if (val == 0 && dir < 0) {
 466                         changed = -EINVAL;
 467                         snd_interval_none(i);
 468                 } else if (dir == 0)
 469                         changed = snd_interval_refine_set(i, val);
 470                 else {
 471                         struct snd_interval t;
 472                         t.openmin = 1;
 473                         t.openmax = 1;
 474                         t.empty = 0;
 475                         t.integer = 0;
 476                         if (dir < 0) {
 477                                 t.min = val - 1;
 478                                 t.max = val;
 479                         } else {
 480                                 t.min = val;
 481                                 t.max = val+1;
 482                         }
 483                         changed = snd_interval_refine(i, &t);
 484                 }
 485         } else
 486                 return -EINVAL;
 487         if (changed > 0) {
 488                 params->cmask |= 1 << var;
 489                 params->rmask |= 1 << var;
 490         }
 491         return changed;
 492 }
 493 
 494 /**
 495  * snd_pcm_hw_param_set
 496  * @pcm: PCM instance
 497  * @params: the hw_params instance
 498  * @var: parameter to retrieve
 499  * @val: value to set
 500  * @dir: pointer to the direction (-1,0,1) or NULL
 501  *
 502  * Inside configuration space defined by PARAMS remove from PAR all 
 503  * values != VAL. Reduce configuration space accordingly.
 504  *  Return VAL or -EINVAL if the configuration space is empty
 505  */
 506 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 507                                 struct snd_pcm_hw_params *params,
 508                                 snd_pcm_hw_param_t var, unsigned int val,
 509                                 int dir)
 510 {
 511         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 512         if (changed < 0)
 513                 return changed;
 514         if (params->rmask) {
 515                 int err = snd_pcm_hw_refine(pcm, params);
 516                 if (err < 0)
 517                         return err;
 518         }
 519         return snd_pcm_hw_param_value(params, var, NULL);
 520 }
 521 
 522 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 523                                         snd_pcm_hw_param_t var)
 524 {
 525         int changed;
 526         changed = snd_interval_setinteger(hw_param_interval(params, var));
 527         if (changed > 0) {
 528                 params->cmask |= 1 << var;
 529                 params->rmask |= 1 << var;
 530         }
 531         return changed;
 532 }
 533         
 534 /*
 535  * plugin
 536  */
 537 
 538 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 539 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 540 {
 541         struct snd_pcm_runtime *runtime = substream->runtime;
 542         struct snd_pcm_plugin *plugin, *next;
 543         
 544         plugin = runtime->oss.plugin_first;
 545         while (plugin) {
 546                 next = plugin->next;
 547                 snd_pcm_plugin_free(plugin);
 548                 plugin = next;
 549         }
 550         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 551         return 0;
 552 }
 553 
 554 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 555 {
 556         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 557         plugin->next = runtime->oss.plugin_first;
 558         plugin->prev = NULL;
 559         if (runtime->oss.plugin_first) {
 560                 runtime->oss.plugin_first->prev = plugin;
 561                 runtime->oss.plugin_first = plugin;
 562         } else {
 563                 runtime->oss.plugin_last =
 564                 runtime->oss.plugin_first = plugin;
 565         }
 566         return 0;
 567 }
 568 
 569 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 570 {
 571         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 572         plugin->next = NULL;
 573         plugin->prev = runtime->oss.plugin_last;
 574         if (runtime->oss.plugin_last) {
 575                 runtime->oss.plugin_last->next = plugin;
 576                 runtime->oss.plugin_last = plugin;
 577         } else {
 578                 runtime->oss.plugin_last =
 579                 runtime->oss.plugin_first = plugin;
 580         }
 581         return 0;
 582 }
 583 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 584 
 585 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 586 {
 587         struct snd_pcm_runtime *runtime = substream->runtime;
 588         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 589         long bytes = frames_to_bytes(runtime, frames);
 590         if (buffer_size == runtime->oss.buffer_bytes)
 591                 return bytes;
 592 #if BITS_PER_LONG >= 64
 593         return runtime->oss.buffer_bytes * bytes / buffer_size;
 594 #else
 595         {
 596                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 597                 return div_u64(bsize, buffer_size);
 598         }
 599 #endif
 600 }
 601 
 602 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 603 {
 604         struct snd_pcm_runtime *runtime = substream->runtime;
 605         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 606         if (buffer_size == runtime->oss.buffer_bytes)
 607                 return bytes_to_frames(runtime, bytes);
 608         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 609 }
 610 
 611 static inline
 612 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 613 {
 614         return runtime->hw_ptr_interrupt;
 615 }
 616 
 617 /* define extended formats in the recent OSS versions (if any) */
 618 /* linear formats */
 619 #define AFMT_S32_LE      0x00001000
 620 #define AFMT_S32_BE      0x00002000
 621 #define AFMT_S24_LE      0x00008000
 622 #define AFMT_S24_BE      0x00010000
 623 #define AFMT_S24_PACKED  0x00040000
 624 
 625 /* other supported formats */
 626 #define AFMT_FLOAT       0x00004000
 627 #define AFMT_SPDIF_RAW   0x00020000
 628 
 629 /* unsupported formats */
 630 #define AFMT_AC3         0x00000400
 631 #define AFMT_VORBIS      0x00000800
 632 
 633 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 634 {
 635         switch (format) {
 636         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 637         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 638         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 639         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 640         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 641         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 642         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 643         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 644         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 645         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 646         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 647         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 648         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 649         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 650         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 651         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 652         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 653         default:                return SNDRV_PCM_FORMAT_U8;
 654         }
 655 }
 656 
 657 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 658 {
 659         switch (format) {
 660         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 661         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 662         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 663         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 664         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 665         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 666         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 667         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 668         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 669         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 670         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 671         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 672         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 673         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 674         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 675         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 676         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 677         default:                        return -EINVAL;
 678         }
 679 }
 680 
 681 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, 
 682                                    struct snd_pcm_hw_params *oss_params,
 683                                    struct snd_pcm_hw_params *slave_params)
 684 {
 685         size_t s;
 686         size_t oss_buffer_size, oss_period_size, oss_periods;
 687         size_t min_period_size, max_period_size;
 688         struct snd_pcm_runtime *runtime = substream->runtime;
 689         size_t oss_frame_size;
 690 
 691         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 692                          params_channels(oss_params) / 8;
 693 
 694         oss_buffer_size = snd_pcm_plug_client_size(substream,
 695                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
 696         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 697         if (atomic_read(&substream->mmap_count)) {
 698                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 699                         oss_buffer_size = runtime->oss.mmap_bytes;
 700         }
 701 
 702         if (substream->oss.setup.period_size > 16)
 703                 oss_period_size = substream->oss.setup.period_size;
 704         else if (runtime->oss.fragshift) {
 705                 oss_period_size = 1 << runtime->oss.fragshift;
 706                 if (oss_period_size > oss_buffer_size / 2)
 707                         oss_period_size = oss_buffer_size / 2;
 708         } else {
 709                 int sd;
 710                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 711 
 712                 oss_period_size = oss_buffer_size;
 713                 do {
 714                         oss_period_size /= 2;
 715                 } while (oss_period_size > bytes_per_sec);
 716                 if (runtime->oss.subdivision == 0) {
 717                         sd = 4;
 718                         if (oss_period_size / sd > 4096)
 719                                 sd *= 2;
 720                         if (oss_period_size / sd < 4096)
 721                                 sd = 1;
 722                 } else
 723                         sd = runtime->oss.subdivision;
 724                 oss_period_size /= sd;
 725                 if (oss_period_size < 16)
 726                         oss_period_size = 16;
 727         }
 728 
 729         min_period_size = snd_pcm_plug_client_size(substream,
 730                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 731         min_period_size *= oss_frame_size;
 732         min_period_size = roundup_pow_of_two(min_period_size);
 733         if (oss_period_size < min_period_size)
 734                 oss_period_size = min_period_size;
 735 
 736         max_period_size = snd_pcm_plug_client_size(substream,
 737                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 738         max_period_size *= oss_frame_size;
 739         max_period_size = rounddown_pow_of_two(max_period_size);
 740         if (oss_period_size > max_period_size)
 741                 oss_period_size = max_period_size;
 742 
 743         oss_periods = oss_buffer_size / oss_period_size;
 744 
 745         if (substream->oss.setup.periods > 1)
 746                 oss_periods = substream->oss.setup.periods;
 747 
 748         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 749         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 750                 s = runtime->oss.maxfrags;
 751         if (oss_periods > s)
 752                 oss_periods = s;
 753 
 754         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 755         if (s < 2)
 756                 s = 2;
 757         if (oss_periods < s)
 758                 oss_periods = s;
 759 
 760         while (oss_period_size * oss_periods > oss_buffer_size)
 761                 oss_period_size /= 2;
 762 
 763         if (oss_period_size < 16)
 764                 return -EINVAL;
 765         runtime->oss.period_bytes = oss_period_size;
 766         runtime->oss.period_frames = 1;
 767         runtime->oss.periods = oss_periods;
 768         return 0;
 769 }
 770 
 771 static int choose_rate(struct snd_pcm_substream *substream,
 772                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 773 {
 774         const struct snd_interval *it;
 775         struct snd_pcm_hw_params *save;
 776         unsigned int rate, prev;
 777 
 778         save = kmalloc(sizeof(*save), GFP_KERNEL);
 779         if (save == NULL)
 780                 return -ENOMEM;
 781         *save = *params;
 782         it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
 783 
 784         /* try multiples of the best rate */
 785         rate = best_rate;
 786         for (;;) {
 787                 if (it->max < rate || (it->max == rate && it->openmax))
 788                         break;
 789                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 790                         int ret;
 791                         ret = snd_pcm_hw_param_set(substream, params,
 792                                                    SNDRV_PCM_HW_PARAM_RATE,
 793                                                    rate, 0);
 794                         if (ret == (int)rate) {
 795                                 kfree(save);
 796                                 return rate;
 797                         }
 798                         *params = *save;
 799                 }
 800                 prev = rate;
 801                 rate += best_rate;
 802                 if (rate <= prev)
 803                         break;
 804         }
 805 
 806         /* not found, use the nearest rate */
 807         kfree(save);
 808         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 809 }
 810 
 811 /* parameter locking: returns immediately if tried during streaming */
 812 static int lock_params(struct snd_pcm_runtime *runtime)
 813 {
 814         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 815                 return -ERESTARTSYS;
 816         if (atomic_read(&runtime->oss.rw_ref)) {
 817                 mutex_unlock(&runtime->oss.params_lock);
 818                 return -EBUSY;
 819         }
 820         return 0;
 821 }
 822 
 823 static void unlock_params(struct snd_pcm_runtime *runtime)
 824 {
 825         mutex_unlock(&runtime->oss.params_lock);
 826 }
 827 
 828 /* call with params_lock held */
 829 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 830 {
 831         struct snd_pcm_runtime *runtime = substream->runtime;
 832         struct snd_pcm_hw_params *params, *sparams;
 833         struct snd_pcm_sw_params *sw_params;
 834         ssize_t oss_buffer_size, oss_period_size;
 835         size_t oss_frame_size;
 836         int err;
 837         int direct;
 838         snd_pcm_format_t format, sformat;
 839         int n;
 840         const struct snd_mask *sformat_mask;
 841         struct snd_mask mask;
 842 
 843         if (!runtime->oss.params)
 844                 return 0;
 845         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 846         params = kmalloc(sizeof(*params), GFP_KERNEL);
 847         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 848         if (!sw_params || !params || !sparams) {
 849                 err = -ENOMEM;
 850                 goto failure;
 851         }
 852 
 853         if (atomic_read(&substream->mmap_count))
 854                 direct = 1;
 855         else
 856                 direct = substream->oss.setup.direct;
 857 
 858         _snd_pcm_hw_params_any(sparams);
 859         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 860         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 861         snd_mask_none(&mask);
 862         if (atomic_read(&substream->mmap_count))
 863                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 864         else {
 865                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 866                 if (!direct)
 867                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 868         }
 869         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 870         if (err < 0) {
 871                 pcm_dbg(substream->pcm, "No usable accesses\n");
 872                 err = -EINVAL;
 873                 goto failure;
 874         }
 875         choose_rate(substream, sparams, runtime->oss.rate);
 876         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
 877 
 878         format = snd_pcm_oss_format_from(runtime->oss.format);
 879 
 880         sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 881         if (direct)
 882                 sformat = format;
 883         else
 884                 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
 885 
 886         if ((__force int)sformat < 0 ||
 887             !snd_mask_test(sformat_mask, (__force int)sformat)) {
 888                 for (sformat = (__force snd_pcm_format_t)0;
 889                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
 890                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
 891                         if (snd_mask_test(sformat_mask, (__force int)sformat) &&
 892                             snd_pcm_oss_format_to(sformat) >= 0)
 893                                 break;
 894                 }
 895                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
 896                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 897                         err = -EINVAL;
 898                         goto failure;
 899                 }
 900         }
 901         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 902         if (err < 0)
 903                 goto failure;
 904 
 905         if (direct) {
 906                 memcpy(params, sparams, sizeof(*params));
 907         } else {
 908                 _snd_pcm_hw_params_any(params);
 909                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 910                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 911                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 912                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 913                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 914                                       runtime->oss.channels, 0);
 915                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 916                                       runtime->oss.rate, 0);
 917                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 918                          params_access(params), params_format(params),
 919                          params_channels(params), params_rate(params));
 920         }
 921         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 922                  params_access(sparams), params_format(sparams),
 923                  params_channels(sparams), params_rate(sparams));
 924 
 925         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 926                          params_channels(params) / 8;
 927 
 928         err = snd_pcm_oss_period_size(substream, params, sparams);
 929         if (err < 0)
 930                 goto failure;
 931 
 932         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 933         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 934         if (err < 0)
 935                 goto failure;
 936 
 937         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 938                                      runtime->oss.periods, NULL);
 939         if (err < 0)
 940                 goto failure;
 941 
 942         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
 943 
 944         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
 945         if (err < 0) {
 946                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
 947                 goto failure;
 948         }
 949 
 950 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 951         snd_pcm_oss_plugin_clear(substream);
 952         if (!direct) {
 953                 /* add necessary plugins */
 954                 snd_pcm_oss_plugin_clear(substream);
 955                 if ((err = snd_pcm_plug_format_plugins(substream,
 956                                                        params, 
 957                                                        sparams)) < 0) {
 958                         pcm_dbg(substream->pcm,
 959                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
 960                         snd_pcm_oss_plugin_clear(substream);
 961                         goto failure;
 962                 }
 963                 if (runtime->oss.plugin_first) {
 964                         struct snd_pcm_plugin *plugin;
 965                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
 966                                 pcm_dbg(substream->pcm,
 967                                         "snd_pcm_plugin_build_io failed: %i\n", err);
 968                                 snd_pcm_oss_plugin_clear(substream);
 969                                 goto failure;
 970                         }
 971                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 972                                 err = snd_pcm_plugin_append(plugin);
 973                         } else {
 974                                 err = snd_pcm_plugin_insert(plugin);
 975                         }
 976                         if (err < 0) {
 977                                 snd_pcm_oss_plugin_clear(substream);
 978                                 goto failure;
 979                         }
 980                 }
 981         }
 982 #endif
 983 
 984         if (runtime->oss.trigger) {
 985                 sw_params->start_threshold = 1;
 986         } else {
 987                 sw_params->start_threshold = runtime->boundary;
 988         }
 989         if (atomic_read(&substream->mmap_count) ||
 990             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 991                 sw_params->stop_threshold = runtime->boundary;
 992         else
 993                 sw_params->stop_threshold = runtime->buffer_size;
 994         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 995         sw_params->period_step = 1;
 996         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 997                 1 : runtime->period_size;
 998         if (atomic_read(&substream->mmap_count) ||
 999             substream->oss.setup.nosilence) {
1000                 sw_params->silence_threshold = 0;
1001                 sw_params->silence_size = 0;
1002         } else {
1003                 snd_pcm_uframes_t frames;
1004                 frames = runtime->period_size + 16;
1005                 if (frames > runtime->buffer_size)
1006                         frames = runtime->buffer_size;
1007                 sw_params->silence_threshold = frames;
1008                 sw_params->silence_size = frames;
1009         }
1010 
1011         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1012                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1013                 goto failure;
1014         }
1015 
1016         runtime->oss.periods = params_periods(sparams);
1017         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1018         if (oss_period_size < 0) {
1019                 err = -EINVAL;
1020                 goto failure;
1021         }
1022 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1023         if (runtime->oss.plugin_first) {
1024                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1025                 if (err < 0)
1026                         goto failure;
1027         }
1028 #endif
1029         oss_period_size *= oss_frame_size;
1030 
1031         oss_buffer_size = oss_period_size * runtime->oss.periods;
1032         if (oss_buffer_size < 0) {
1033                 err = -EINVAL;
1034                 goto failure;
1035         }
1036 
1037         runtime->oss.period_bytes = oss_period_size;
1038         runtime->oss.buffer_bytes = oss_buffer_size;
1039 
1040         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1041                  runtime->oss.period_bytes,
1042                  runtime->oss.buffer_bytes);
1043         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1044                  params_period_size(sparams),
1045                  params_buffer_size(sparams));
1046 
1047         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1048         runtime->oss.channels = params_channels(params);
1049         runtime->oss.rate = params_rate(params);
1050 
1051         kvfree(runtime->oss.buffer);
1052         runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1053         if (!runtime->oss.buffer) {
1054                 err = -ENOMEM;
1055                 goto failure;
1056         }
1057 
1058         runtime->oss.params = 0;
1059         runtime->oss.prepare = 1;
1060         runtime->oss.buffer_used = 0;
1061         if (runtime->dma_area)
1062                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1063 
1064         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1065 
1066         err = 0;
1067 failure:
1068         kfree(sw_params);
1069         kfree(params);
1070         kfree(sparams);
1071         return err;
1072 }
1073 
1074 /* this one takes the lock by itself */
1075 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1076                                      bool trylock)
1077 {
1078         struct snd_pcm_runtime *runtime = substream->runtime;
1079         int err;
1080 
1081         if (trylock) {
1082                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1083                         return -EAGAIN;
1084         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1085                 return -ERESTARTSYS;
1086 
1087         err = snd_pcm_oss_change_params_locked(substream);
1088         mutex_unlock(&runtime->oss.params_lock);
1089         return err;
1090 }
1091 
1092 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1093 {
1094         int idx, err;
1095         struct snd_pcm_substream *asubstream = NULL, *substream;
1096 
1097         for (idx = 0; idx < 2; idx++) {
1098                 substream = pcm_oss_file->streams[idx];
1099                 if (substream == NULL)
1100                         continue;
1101                 if (asubstream == NULL)
1102                         asubstream = substream;
1103                 if (substream->runtime->oss.params) {
1104                         err = snd_pcm_oss_change_params(substream, false);
1105                         if (err < 0)
1106                                 return err;
1107                 }
1108         }
1109         if (!asubstream)
1110                 return -EIO;
1111         if (r_substream)
1112                 *r_substream = asubstream;
1113         return 0;
1114 }
1115 
1116 /* call with params_lock held */
1117 /* NOTE: this always call PREPARE unconditionally no matter whether
1118  * runtime->oss.prepare is set or not
1119  */
1120 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1121 {
1122         int err;
1123         struct snd_pcm_runtime *runtime = substream->runtime;
1124 
1125         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1126         if (err < 0) {
1127                 pcm_dbg(substream->pcm,
1128                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1129                 return err;
1130         }
1131         runtime->oss.prepare = 0;
1132         runtime->oss.prev_hw_ptr_period = 0;
1133         runtime->oss.period_ptr = 0;
1134         runtime->oss.buffer_used = 0;
1135 
1136         return 0;
1137 }
1138 
1139 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1140 {
1141         struct snd_pcm_runtime *runtime;
1142         int err;
1143 
1144         runtime = substream->runtime;
1145         if (runtime->oss.params) {
1146                 err = snd_pcm_oss_change_params(substream, false);
1147                 if (err < 0)
1148                         return err;
1149         }
1150         if (runtime->oss.prepare) {
1151                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1152                         return -ERESTARTSYS;
1153                 err = snd_pcm_oss_prepare(substream);
1154                 mutex_unlock(&runtime->oss.params_lock);
1155                 if (err < 0)
1156                         return err;
1157         }
1158         return 0;
1159 }
1160 
1161 /* call with params_lock held */
1162 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1163 {
1164         struct snd_pcm_runtime *runtime;
1165         int err;
1166 
1167         runtime = substream->runtime;
1168         if (runtime->oss.params) {
1169                 err = snd_pcm_oss_change_params_locked(substream);
1170                 if (err < 0)
1171                         return err;
1172         }
1173         if (runtime->oss.prepare) {
1174                 err = snd_pcm_oss_prepare(substream);
1175                 if (err < 0)
1176                         return err;
1177         }
1178         return 0;
1179 }
1180 
1181 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1182 {
1183         struct snd_pcm_runtime *runtime;
1184         snd_pcm_uframes_t frames;
1185         int err = 0;
1186 
1187         while (1) {
1188                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1189                 if (err < 0)
1190                         break;
1191                 runtime = substream->runtime;
1192                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1193                         break;
1194                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1195                 /* until avail(delay) <= buffer_size */
1196                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1197                 frames /= runtime->period_size;
1198                 frames *= runtime->period_size;
1199                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1200                 if (err < 0)
1201                         break;
1202         }
1203         return err;
1204 }
1205 
1206 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1207 {
1208         struct snd_pcm_runtime *runtime = substream->runtime;
1209         int ret;
1210         while (1) {
1211                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1212                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1213 #ifdef OSS_DEBUG
1214                         pcm_dbg(substream->pcm,
1215                                 "pcm_oss: write: recovering from %s\n",
1216                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1217                                 "XRUN" : "SUSPEND");
1218 #endif
1219                         ret = snd_pcm_oss_prepare(substream);
1220                         if (ret < 0)
1221                                 break;
1222                 }
1223                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1224                                          frames, in_kernel);
1225                 if (ret != -EPIPE && ret != -ESTRPIPE)
1226                         break;
1227                 /* test, if we can't store new data, because the stream */
1228                 /* has not been started */
1229                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1230                         return -EAGAIN;
1231         }
1232         return ret;
1233 }
1234 
1235 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1236 {
1237         struct snd_pcm_runtime *runtime = substream->runtime;
1238         snd_pcm_sframes_t delay;
1239         int ret;
1240         while (1) {
1241                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1242                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1243 #ifdef OSS_DEBUG
1244                         pcm_dbg(substream->pcm,
1245                                 "pcm_oss: read: recovering from %s\n",
1246                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1247                                 "XRUN" : "SUSPEND");
1248 #endif
1249                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1250                         if (ret < 0)
1251                                 break;
1252                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1253                         ret = snd_pcm_oss_prepare(substream);
1254                         if (ret < 0)
1255                                 break;
1256                 }
1257                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1258                 if (ret < 0)
1259                         break;
1260                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1261                                          frames, in_kernel);
1262                 if (ret == -EPIPE) {
1263                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1264                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1265                                 if (ret < 0)
1266                                         break;
1267                         }
1268                         continue;
1269                 }
1270                 if (ret != -ESTRPIPE)
1271                         break;
1272         }
1273         return ret;
1274 }
1275 
1276 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1277 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1278 {
1279         struct snd_pcm_runtime *runtime = substream->runtime;
1280         int ret;
1281         while (1) {
1282                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1283                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1284 #ifdef OSS_DEBUG
1285                         pcm_dbg(substream->pcm,
1286                                 "pcm_oss: writev: recovering from %s\n",
1287                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1288                                 "XRUN" : "SUSPEND");
1289 #endif
1290                         ret = snd_pcm_oss_prepare(substream);
1291                         if (ret < 0)
1292                                 break;
1293                 }
1294                 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1295                 if (ret != -EPIPE && ret != -ESTRPIPE)
1296                         break;
1297 
1298                 /* test, if we can't store new data, because the stream */
1299                 /* has not been started */
1300                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1301                         return -EAGAIN;
1302         }
1303         return ret;
1304 }
1305         
1306 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1307 {
1308         struct snd_pcm_runtime *runtime = substream->runtime;
1309         int ret;
1310         while (1) {
1311                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1312                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1313 #ifdef OSS_DEBUG
1314                         pcm_dbg(substream->pcm,
1315                                 "pcm_oss: readv: recovering from %s\n",
1316                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1317                                 "XRUN" : "SUSPEND");
1318 #endif
1319                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1320                         if (ret < 0)
1321                                 break;
1322                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1323                         ret = snd_pcm_oss_prepare(substream);
1324                         if (ret < 0)
1325                                 break;
1326                 }
1327                 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1328                 if (ret != -EPIPE && ret != -ESTRPIPE)
1329                         break;
1330         }
1331         return ret;
1332 }
1333 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1334 
1335 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1336 {
1337         struct snd_pcm_runtime *runtime = substream->runtime;
1338         snd_pcm_sframes_t frames, frames1;
1339 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1340         if (runtime->oss.plugin_first) {
1341                 struct snd_pcm_plugin_channel *channels;
1342                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1343                 if (!in_kernel) {
1344                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1345                                 return -EFAULT;
1346                         buf = runtime->oss.buffer;
1347                 }
1348                 frames = bytes / oss_frame_bytes;
1349                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1350                 if (frames1 < 0)
1351                         return frames1;
1352                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1353                 if (frames1 <= 0)
1354                         return frames1;
1355                 bytes = frames1 * oss_frame_bytes;
1356         } else
1357 #endif
1358         {
1359                 frames = bytes_to_frames(runtime, bytes);
1360                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1361                 if (frames1 <= 0)
1362                         return frames1;
1363                 bytes = frames_to_bytes(runtime, frames1);
1364         }
1365         return bytes;
1366 }
1367 
1368 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1369 {
1370         size_t xfer = 0;
1371         ssize_t tmp = 0;
1372         struct snd_pcm_runtime *runtime = substream->runtime;
1373 
1374         if (atomic_read(&substream->mmap_count))
1375                 return -ENXIO;
1376 
1377         atomic_inc(&runtime->oss.rw_ref);
1378         while (bytes > 0) {
1379                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1380                         tmp = -ERESTARTSYS;
1381                         break;
1382                 }
1383                 tmp = snd_pcm_oss_make_ready_locked(substream);
1384                 if (tmp < 0)
1385                         goto err;
1386                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1387                         tmp = bytes;
1388                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1389                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1390                         if (tmp > 0) {
1391                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1392                                         tmp = -EFAULT;
1393                                         goto err;
1394                                 }
1395                         }
1396                         runtime->oss.buffer_used += tmp;
1397                         buf += tmp;
1398                         bytes -= tmp;
1399                         xfer += tmp;
1400                         if (substream->oss.setup.partialfrag ||
1401                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1402                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr, 
1403                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1404                                 if (tmp <= 0)
1405                                         goto err;
1406                                 runtime->oss.bytes += tmp;
1407                                 runtime->oss.period_ptr += tmp;
1408                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1409                                 if (runtime->oss.period_ptr == 0 ||
1410                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1411                                         runtime->oss.buffer_used = 0;
1412                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1413                                         tmp = -EAGAIN;
1414                                         goto err;
1415                                 }
1416                         }
1417                 } else {
1418                         tmp = snd_pcm_oss_write2(substream,
1419                                                  (const char __force *)buf,
1420                                                  runtime->oss.period_bytes, 0);
1421                         if (tmp <= 0)
1422                                 goto err;
1423                         runtime->oss.bytes += tmp;
1424                         buf += tmp;
1425                         bytes -= tmp;
1426                         xfer += tmp;
1427                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1428                             tmp != runtime->oss.period_bytes)
1429                                 tmp = -EAGAIN;
1430                 }
1431  err:
1432                 mutex_unlock(&runtime->oss.params_lock);
1433                 if (tmp < 0)
1434                         break;
1435                 if (signal_pending(current)) {
1436                         tmp = -ERESTARTSYS;
1437                         break;
1438                 }
1439                 tmp = 0;
1440         }
1441         atomic_dec(&runtime->oss.rw_ref);
1442         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1443 }
1444 
1445 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1446 {
1447         struct snd_pcm_runtime *runtime = substream->runtime;
1448         snd_pcm_sframes_t frames, frames1;
1449 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1450         char __user *final_dst = (char __force __user *)buf;
1451         if (runtime->oss.plugin_first) {
1452                 struct snd_pcm_plugin_channel *channels;
1453                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1454                 if (!in_kernel)
1455                         buf = runtime->oss.buffer;
1456                 frames = bytes / oss_frame_bytes;
1457                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1458                 if (frames1 < 0)
1459                         return frames1;
1460                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1461                 if (frames1 <= 0)
1462                         return frames1;
1463                 bytes = frames1 * oss_frame_bytes;
1464                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1465                         return -EFAULT;
1466         } else
1467 #endif
1468         {
1469                 frames = bytes_to_frames(runtime, bytes);
1470                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1471                 if (frames1 <= 0)
1472                         return frames1;
1473                 bytes = frames_to_bytes(runtime, frames1);
1474         }
1475         return bytes;
1476 }
1477 
1478 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1479 {
1480         size_t xfer = 0;
1481         ssize_t tmp = 0;
1482         struct snd_pcm_runtime *runtime = substream->runtime;
1483 
1484         if (atomic_read(&substream->mmap_count))
1485                 return -ENXIO;
1486 
1487         atomic_inc(&runtime->oss.rw_ref);
1488         while (bytes > 0) {
1489                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1490                         tmp = -ERESTARTSYS;
1491                         break;
1492                 }
1493                 tmp = snd_pcm_oss_make_ready_locked(substream);
1494                 if (tmp < 0)
1495                         goto err;
1496                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1497                         if (runtime->oss.buffer_used == 0) {
1498                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1499                                 if (tmp <= 0)
1500                                         goto err;
1501                                 runtime->oss.bytes += tmp;
1502                                 runtime->oss.period_ptr = tmp;
1503                                 runtime->oss.buffer_used = tmp;
1504                         }
1505                         tmp = bytes;
1506                         if ((size_t) tmp > runtime->oss.buffer_used)
1507                                 tmp = runtime->oss.buffer_used;
1508                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1509                                 tmp = -EFAULT;
1510                                 goto err;
1511                         }
1512                         buf += tmp;
1513                         bytes -= tmp;
1514                         xfer += tmp;
1515                         runtime->oss.buffer_used -= tmp;
1516                 } else {
1517                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1518                                                 runtime->oss.period_bytes, 0);
1519                         if (tmp <= 0)
1520                                 goto err;
1521                         runtime->oss.bytes += tmp;
1522                         buf += tmp;
1523                         bytes -= tmp;
1524                         xfer += tmp;
1525                 }
1526  err:
1527                 mutex_unlock(&runtime->oss.params_lock);
1528                 if (tmp < 0)
1529                         break;
1530                 if (signal_pending(current)) {
1531                         tmp = -ERESTARTSYS;
1532                         break;
1533                 }
1534                 tmp = 0;
1535         }
1536         atomic_dec(&runtime->oss.rw_ref);
1537         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1538 }
1539 
1540 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1541 {
1542         struct snd_pcm_substream *substream;
1543         struct snd_pcm_runtime *runtime;
1544         int i;
1545 
1546         for (i = 0; i < 2; i++) { 
1547                 substream = pcm_oss_file->streams[i];
1548                 if (!substream)
1549                         continue;
1550                 runtime = substream->runtime;
1551                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1552                 mutex_lock(&runtime->oss.params_lock);
1553                 runtime->oss.prepare = 1;
1554                 runtime->oss.buffer_used = 0;
1555                 runtime->oss.prev_hw_ptr_period = 0;
1556                 runtime->oss.period_ptr = 0;
1557                 mutex_unlock(&runtime->oss.params_lock);
1558         }
1559         return 0;
1560 }
1561 
1562 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1563 {
1564         struct snd_pcm_substream *substream;
1565         int err;
1566 
1567         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1568         if (substream != NULL) {
1569                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1570                         return err;
1571                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1572         }
1573         /* note: all errors from the start action are ignored */
1574         /* OSS apps do not know, how to handle them */
1575         return 0;
1576 }
1577 
1578 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1579 {
1580         struct snd_pcm_runtime *runtime;
1581         ssize_t result = 0;
1582         snd_pcm_state_t state;
1583         long res;
1584         wait_queue_entry_t wait;
1585 
1586         runtime = substream->runtime;
1587         init_waitqueue_entry(&wait, current);
1588         add_wait_queue(&runtime->sleep, &wait);
1589 #ifdef OSS_DEBUG
1590         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1591 #endif
1592         while (1) {
1593                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1594                 if (result > 0) {
1595                         runtime->oss.buffer_used = 0;
1596                         result = 0;
1597                         break;
1598                 }
1599                 if (result != 0 && result != -EAGAIN)
1600                         break;
1601                 result = 0;
1602                 set_current_state(TASK_INTERRUPTIBLE);
1603                 snd_pcm_stream_lock_irq(substream);
1604                 state = runtime->status->state;
1605                 snd_pcm_stream_unlock_irq(substream);
1606                 if (state != SNDRV_PCM_STATE_RUNNING) {
1607                         set_current_state(TASK_RUNNING);
1608                         break;
1609                 }
1610                 res = schedule_timeout(10 * HZ);
1611                 if (signal_pending(current)) {
1612                         result = -ERESTARTSYS;
1613                         break;
1614                 }
1615                 if (res == 0) {
1616                         pcm_err(substream->pcm,
1617                                 "OSS sync error - DMA timeout\n");
1618                         result = -EIO;
1619                         break;
1620                 }
1621         }
1622         remove_wait_queue(&runtime->sleep, &wait);
1623         return result;
1624 }
1625 
1626 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1627 {
1628         int err = 0;
1629         unsigned int saved_f_flags;
1630         struct snd_pcm_substream *substream;
1631         struct snd_pcm_runtime *runtime;
1632         snd_pcm_format_t format;
1633         unsigned long width;
1634         size_t size;
1635 
1636         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1637         if (substream != NULL) {
1638                 runtime = substream->runtime;
1639                 if (atomic_read(&substream->mmap_count))
1640                         goto __direct;
1641                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1642                         return err;
1643                 atomic_inc(&runtime->oss.rw_ref);
1644                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1645                         atomic_dec(&runtime->oss.rw_ref);
1646                         return -ERESTARTSYS;
1647                 }
1648                 format = snd_pcm_oss_format_from(runtime->oss.format);
1649                 width = snd_pcm_format_physical_width(format);
1650                 if (runtime->oss.buffer_used > 0) {
1651 #ifdef OSS_DEBUG
1652                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1653 #endif
1654                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1655                         snd_pcm_format_set_silence(format,
1656                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1657                                                    size);
1658                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1659                         if (err < 0)
1660                                 goto unlock;
1661                 } else if (runtime->oss.period_ptr > 0) {
1662 #ifdef OSS_DEBUG
1663                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1664 #endif
1665                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1666                         snd_pcm_format_set_silence(format,
1667                                                    runtime->oss.buffer,
1668                                                    size * 8 / width);
1669                         err = snd_pcm_oss_sync1(substream, size);
1670                         if (err < 0)
1671                                 goto unlock;
1672                 }
1673                 /*
1674                  * The ALSA's period might be a bit large than OSS one.
1675                  * Fill the remain portion of ALSA period with zeros.
1676                  */
1677                 size = runtime->control->appl_ptr % runtime->period_size;
1678                 if (size > 0) {
1679                         size = runtime->period_size - size;
1680                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1681                                 snd_pcm_lib_write(substream, NULL, size);
1682                         else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1683                                 snd_pcm_lib_writev(substream, NULL, size);
1684                 }
1685 unlock:
1686                 mutex_unlock(&runtime->oss.params_lock);
1687                 atomic_dec(&runtime->oss.rw_ref);
1688                 if (err < 0)
1689                         return err;
1690                 /*
1691                  * finish sync: drain the buffer
1692                  */
1693               __direct:
1694                 saved_f_flags = substream->f_flags;
1695                 substream->f_flags &= ~O_NONBLOCK;
1696                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1697                 substream->f_flags = saved_f_flags;
1698                 if (err < 0)
1699                         return err;
1700                 mutex_lock(&runtime->oss.params_lock);
1701                 runtime->oss.prepare = 1;
1702                 mutex_unlock(&runtime->oss.params_lock);
1703         }
1704 
1705         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1706         if (substream != NULL) {
1707                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1708                         return err;
1709                 runtime = substream->runtime;
1710                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1711                 if (err < 0)
1712                         return err;
1713                 mutex_lock(&runtime->oss.params_lock);
1714                 runtime->oss.buffer_used = 0;
1715                 runtime->oss.prepare = 1;
1716                 mutex_unlock(&runtime->oss.params_lock);
1717         }
1718         return 0;
1719 }
1720 
1721 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1722 {
1723         int idx;
1724 
1725         for (idx = 1; idx >= 0; --idx) {
1726                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1727                 struct snd_pcm_runtime *runtime;
1728                 int err;
1729 
1730                 if (substream == NULL)
1731                         continue;
1732                 runtime = substream->runtime;
1733                 if (rate < 1000)
1734                         rate = 1000;
1735                 else if (rate > 192000)
1736                         rate = 192000;
1737                 err = lock_params(runtime);
1738                 if (err < 0)
1739                         return err;
1740                 if (runtime->oss.rate != rate) {
1741                         runtime->oss.params = 1;
1742                         runtime->oss.rate = rate;
1743                 }
1744                 unlock_params(runtime);
1745         }
1746         return snd_pcm_oss_get_rate(pcm_oss_file);
1747 }
1748 
1749 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1750 {
1751         struct snd_pcm_substream *substream;
1752         int err;
1753         
1754         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1755                 return err;
1756         return substream->runtime->oss.rate;
1757 }
1758 
1759 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1760 {
1761         int idx;
1762         if (channels < 1)
1763                 channels = 1;
1764         if (channels > 128)
1765                 return -EINVAL;
1766         for (idx = 1; idx >= 0; --idx) {
1767                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1768                 struct snd_pcm_runtime *runtime;
1769                 int err;
1770 
1771                 if (substream == NULL)
1772                         continue;
1773                 runtime = substream->runtime;
1774                 err = lock_params(runtime);
1775                 if (err < 0)
1776                         return err;
1777                 if (runtime->oss.channels != channels) {
1778                         runtime->oss.params = 1;
1779                         runtime->oss.channels = channels;
1780                 }
1781                 unlock_params(runtime);
1782         }
1783         return snd_pcm_oss_get_channels(pcm_oss_file);
1784 }
1785 
1786 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1787 {
1788         struct snd_pcm_substream *substream;
1789         int err;
1790         
1791         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1792                 return err;
1793         return substream->runtime->oss.channels;
1794 }
1795 
1796 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1797 {
1798         struct snd_pcm_substream *substream;
1799         int err;
1800         
1801         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1802                 return err;
1803         return substream->runtime->oss.period_bytes;
1804 }
1805 
1806 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1807 {
1808         struct snd_pcm_substream *substream;
1809         int err;
1810         int direct;
1811         struct snd_pcm_hw_params *params;
1812         unsigned int formats = 0;
1813         const struct snd_mask *format_mask;
1814         int fmt;
1815 
1816         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1817                 return err;
1818         if (atomic_read(&substream->mmap_count))
1819                 direct = 1;
1820         else
1821                 direct = substream->oss.setup.direct;
1822         if (!direct)
1823                 return AFMT_MU_LAW | AFMT_U8 |
1824                        AFMT_S16_LE | AFMT_S16_BE |
1825                        AFMT_S8 | AFMT_U16_LE |
1826                        AFMT_U16_BE |
1827                         AFMT_S32_LE | AFMT_S32_BE |
1828                         AFMT_S24_LE | AFMT_S24_BE |
1829                         AFMT_S24_PACKED;
1830         params = kmalloc(sizeof(*params), GFP_KERNEL);
1831         if (!params)
1832                 return -ENOMEM;
1833         _snd_pcm_hw_params_any(params);
1834         err = snd_pcm_hw_refine(substream, params);
1835         if (err < 0)
1836                 goto error;
1837         format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1838         for (fmt = 0; fmt < 32; ++fmt) {
1839                 if (snd_mask_test(format_mask, fmt)) {
1840                         int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1841                         if (f >= 0)
1842                                 formats |= f;
1843                 }
1844         }
1845 
1846  error:
1847         kfree(params);
1848         return err < 0 ? err : formats;
1849 }
1850 
1851 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1852 {
1853         int formats, idx;
1854         int err;
1855         
1856         if (format != AFMT_QUERY) {
1857                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1858                 if (formats < 0)
1859                         return formats;
1860                 if (!(formats & format))
1861                         format = AFMT_U8;
1862                 for (idx = 1; idx >= 0; --idx) {
1863                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1864                         struct snd_pcm_runtime *runtime;
1865                         if (substream == NULL)
1866                                 continue;
1867                         runtime = substream->runtime;
1868                         err = lock_params(runtime);
1869                         if (err < 0)
1870                                 return err;
1871                         if (runtime->oss.format != format) {
1872                                 runtime->oss.params = 1;
1873                                 runtime->oss.format = format;
1874                         }
1875                         unlock_params(runtime);
1876                 }
1877         }
1878         return snd_pcm_oss_get_format(pcm_oss_file);
1879 }
1880 
1881 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1882 {
1883         struct snd_pcm_substream *substream;
1884         int err;
1885         
1886         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1887                 return err;
1888         return substream->runtime->oss.format;
1889 }
1890 
1891 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1892 {
1893         struct snd_pcm_runtime *runtime;
1894 
1895         runtime = substream->runtime;
1896         if (subdivide == 0) {
1897                 subdivide = runtime->oss.subdivision;
1898                 if (subdivide == 0)
1899                         subdivide = 1;
1900                 return subdivide;
1901         }
1902         if (runtime->oss.subdivision || runtime->oss.fragshift)
1903                 return -EINVAL;
1904         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1905             subdivide != 8 && subdivide != 16)
1906                 return -EINVAL;
1907         runtime->oss.subdivision = subdivide;
1908         runtime->oss.params = 1;
1909         return subdivide;
1910 }
1911 
1912 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1913 {
1914         int err = -EINVAL, idx;
1915 
1916         for (idx = 1; idx >= 0; --idx) {
1917                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1918                 struct snd_pcm_runtime *runtime;
1919 
1920                 if (substream == NULL)
1921                         continue;
1922                 runtime = substream->runtime;
1923                 err = lock_params(runtime);
1924                 if (err < 0)
1925                         return err;
1926                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1927                 unlock_params(runtime);
1928                 if (err < 0)
1929                         return err;
1930         }
1931         return err;
1932 }
1933 
1934 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1935 {
1936         struct snd_pcm_runtime *runtime;
1937 
1938         runtime = substream->runtime;
1939         if (runtime->oss.subdivision || runtime->oss.fragshift)
1940                 return -EINVAL;
1941         runtime->oss.fragshift = val & 0xffff;
1942         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1943         if (runtime->oss.fragshift < 4)         /* < 16 */
1944                 runtime->oss.fragshift = 4;
1945         if (runtime->oss.maxfrags < 2)
1946                 runtime->oss.maxfrags = 2;
1947         runtime->oss.params = 1;
1948         return 0;
1949 }
1950 
1951 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1952 {
1953         int err = -EINVAL, idx;
1954 
1955         for (idx = 1; idx >= 0; --idx) {
1956                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1957                 struct snd_pcm_runtime *runtime;
1958 
1959                 if (substream == NULL)
1960                         continue;
1961                 runtime = substream->runtime;
1962                 err = lock_params(runtime);
1963                 if (err < 0)
1964                         return err;
1965                 err = snd_pcm_oss_set_fragment1(substream, val);
1966                 unlock_params(runtime);
1967                 if (err < 0)
1968                         return err;
1969         }
1970         return err;
1971 }
1972 
1973 static int snd_pcm_oss_nonblock(struct file * file)
1974 {
1975         spin_lock(&file->f_lock);
1976         file->f_flags |= O_NONBLOCK;
1977         spin_unlock(&file->f_lock);
1978         return 0;
1979 }
1980 
1981 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1982 {
1983 
1984         if (substream == NULL) {
1985                 res &= ~DSP_CAP_DUPLEX;
1986                 return res;
1987         }
1988 #ifdef DSP_CAP_MULTI
1989         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1990                 if (substream->pstr->substream_count > 1)
1991                         res |= DSP_CAP_MULTI;
1992 #endif
1993         /* DSP_CAP_REALTIME is set all times: */
1994         /* all ALSA drivers can return actual pointer in ring buffer */
1995 #if defined(DSP_CAP_REALTIME) && 0
1996         {
1997                 struct snd_pcm_runtime *runtime = substream->runtime;
1998                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
1999                         res &= ~DSP_CAP_REALTIME;
2000         }
2001 #endif
2002         return res;
2003 }
2004 
2005 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2006 {
2007         int result, idx;
2008         
2009         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2010         for (idx = 0; idx < 2; idx++) {
2011                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2012                 result = snd_pcm_oss_get_caps1(substream, result);
2013         }
2014         result |= 0x0001;       /* revision - same as SB AWE 64 */
2015         return result;
2016 }
2017 
2018 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2019                                       snd_pcm_uframes_t hw_ptr)
2020 {
2021         struct snd_pcm_runtime *runtime = substream->runtime;
2022         snd_pcm_uframes_t appl_ptr;
2023         appl_ptr = hw_ptr + runtime->buffer_size;
2024         appl_ptr %= runtime->boundary;
2025         runtime->control->appl_ptr = appl_ptr;
2026 }
2027 
2028 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2029 {
2030         struct snd_pcm_runtime *runtime;
2031         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2032         int err, cmd;
2033 
2034 #ifdef OSS_DEBUG
2035         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2036 #endif
2037         
2038         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2039         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2040 
2041         if (psubstream) {
2042                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2043                         return err;
2044         }
2045         if (csubstream) {
2046                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2047                         return err;
2048         }
2049         if (psubstream) {
2050                 runtime = psubstream->runtime;
2051                 cmd = 0;
2052                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2053                         return -ERESTARTSYS;
2054                 if (trigger & PCM_ENABLE_OUTPUT) {
2055                         if (runtime->oss.trigger)
2056                                 goto _skip1;
2057                         if (atomic_read(&psubstream->mmap_count))
2058                                 snd_pcm_oss_simulate_fill(psubstream,
2059                                                 get_hw_ptr_period(runtime));
2060                         runtime->oss.trigger = 1;
2061                         runtime->start_threshold = 1;
2062                         cmd = SNDRV_PCM_IOCTL_START;
2063                 } else {
2064                         if (!runtime->oss.trigger)
2065                                 goto _skip1;
2066                         runtime->oss.trigger = 0;
2067                         runtime->start_threshold = runtime->boundary;
2068                         cmd = SNDRV_PCM_IOCTL_DROP;
2069                         runtime->oss.prepare = 1;
2070                 }
2071  _skip1:
2072                 mutex_unlock(&runtime->oss.params_lock);
2073                 if (cmd) {
2074                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2075                         if (err < 0)
2076                                 return err;
2077                 }
2078         }
2079         if (csubstream) {
2080                 runtime = csubstream->runtime;
2081                 cmd = 0;
2082                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2083                         return -ERESTARTSYS;
2084                 if (trigger & PCM_ENABLE_INPUT) {
2085                         if (runtime->oss.trigger)
2086                                 goto _skip2;
2087                         runtime->oss.trigger = 1;
2088                         runtime->start_threshold = 1;
2089                         cmd = SNDRV_PCM_IOCTL_START;
2090                 } else {
2091                         if (!runtime->oss.trigger)
2092                                 goto _skip2;
2093                         runtime->oss.trigger = 0;
2094                         runtime->start_threshold = runtime->boundary;
2095                         cmd = SNDRV_PCM_IOCTL_DROP;
2096                         runtime->oss.prepare = 1;
2097                 }
2098  _skip2:
2099                 mutex_unlock(&runtime->oss.params_lock);
2100                 if (cmd) {
2101                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2102                         if (err < 0)
2103                                 return err;
2104                 }
2105         }
2106         return 0;
2107 }
2108 
2109 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2110 {
2111         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2112         int result = 0;
2113 
2114         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2115         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2116         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2117                 result |= PCM_ENABLE_OUTPUT;
2118         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2119                 result |= PCM_ENABLE_INPUT;
2120         return result;
2121 }
2122 
2123 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2124 {
2125         struct snd_pcm_substream *substream;
2126         struct snd_pcm_runtime *runtime;
2127         snd_pcm_sframes_t delay;
2128         int err;
2129 
2130         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2131         if (substream == NULL)
2132                 return -EINVAL;
2133         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2134                 return err;
2135         runtime = substream->runtime;
2136         if (runtime->oss.params || runtime->oss.prepare)
2137                 return 0;
2138         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2139         if (err == -EPIPE)
2140                 delay = 0;      /* hack for broken OSS applications */
2141         else if (err < 0)
2142                 return err;
2143         return snd_pcm_oss_bytes(substream, delay);
2144 }
2145 
2146 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2147 {       
2148         struct snd_pcm_substream *substream;
2149         struct snd_pcm_runtime *runtime;
2150         snd_pcm_sframes_t delay;
2151         int fixup;
2152         struct count_info info;
2153         int err;
2154 
2155         if (_info == NULL)
2156                 return -EFAULT;
2157         substream = pcm_oss_file->streams[stream];
2158         if (substream == NULL)
2159                 return -EINVAL;
2160         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2161                 return err;
2162         runtime = substream->runtime;
2163         if (runtime->oss.params || runtime->oss.prepare) {
2164                 memset(&info, 0, sizeof(info));
2165                 if (copy_to_user(_info, &info, sizeof(info)))
2166                         return -EFAULT;
2167                 return 0;
2168         }
2169         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2170                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2171                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2172                         err = 0;
2173                         delay = 0;
2174                         fixup = 0;
2175                 } else {
2176                         fixup = runtime->oss.buffer_used;
2177                 }
2178         } else {
2179                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2180                 fixup = -runtime->oss.buffer_used;
2181         }
2182         if (err < 0)
2183                 return err;
2184         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2185         if (atomic_read(&substream->mmap_count)) {
2186                 snd_pcm_sframes_t n;
2187                 delay = get_hw_ptr_period(runtime);
2188                 n = delay - runtime->oss.prev_hw_ptr_period;
2189                 if (n < 0)
2190                         n += runtime->boundary;
2191                 info.blocks = n / runtime->period_size;
2192                 runtime->oss.prev_hw_ptr_period = delay;
2193                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2194                         snd_pcm_oss_simulate_fill(substream, delay);
2195                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2196         } else {
2197                 delay = snd_pcm_oss_bytes(substream, delay);
2198                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2199                         if (substream->oss.setup.buggyptr)
2200                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2201                         else
2202                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2203                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2204                 } else {
2205                         delay += fixup;
2206                         info.blocks = delay / runtime->oss.period_bytes;
2207                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2208                 }
2209         }
2210         if (copy_to_user(_info, &info, sizeof(info)))
2211                 return -EFAULT;
2212         return 0;
2213 }
2214 
2215 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2216 {
2217         struct snd_pcm_substream *substream;
2218         struct snd_pcm_runtime *runtime;
2219         snd_pcm_sframes_t avail;
2220         int fixup;
2221         struct audio_buf_info info;
2222         int err;
2223 
2224         if (_info == NULL)
2225                 return -EFAULT;
2226         substream = pcm_oss_file->streams[stream];
2227         if (substream == NULL)
2228                 return -EINVAL;
2229         runtime = substream->runtime;
2230 
2231         if (runtime->oss.params &&
2232             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2233                 return err;
2234 
2235         info.fragsize = runtime->oss.period_bytes;
2236         info.fragstotal = runtime->periods;
2237         if (runtime->oss.prepare) {
2238                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2239                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2240                         info.fragments = runtime->oss.periods;
2241                 } else {
2242                         info.bytes = 0;
2243                         info.fragments = 0;
2244                 }
2245         } else {
2246                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2247                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2248                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2249                                 avail = runtime->buffer_size;
2250                                 err = 0;
2251                                 fixup = 0;
2252                         } else {
2253                                 avail = runtime->buffer_size - avail;
2254                                 fixup = -runtime->oss.buffer_used;
2255                         }
2256                 } else {
2257                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2258                         fixup = runtime->oss.buffer_used;
2259                 }
2260                 if (err < 0)
2261                         return err;
2262                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2263                 info.fragments = info.bytes / runtime->oss.period_bytes;
2264         }
2265 
2266 #ifdef OSS_DEBUG
2267         pcm_dbg(substream->pcm,
2268                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2269                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2270 #endif
2271         if (copy_to_user(_info, &info, sizeof(info)))
2272                 return -EFAULT;
2273         return 0;
2274 }
2275 
2276 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2277 {
2278         // it won't be probably implemented
2279         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2280         return -EINVAL;
2281 }
2282 
2283 static const char *strip_task_path(const char *path)
2284 {
2285         const char *ptr, *ptrl = NULL;
2286         for (ptr = path; *ptr; ptr++) {
2287                 if (*ptr == '/')
2288                         ptrl = ptr + 1;
2289         }
2290         return ptrl;
2291 }
2292 
2293 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2294                                       const char *task_name,
2295                                       struct snd_pcm_oss_setup *rsetup)
2296 {
2297         struct snd_pcm_oss_setup *setup;
2298 
2299         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2300         do {
2301                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2302                      setup = setup->next) {
2303                         if (!strcmp(setup->task_name, task_name))
2304                                 goto out;
2305                 }
2306         } while ((task_name = strip_task_path(task_name)) != NULL);
2307  out:
2308         if (setup)
2309                 *rsetup = *setup;
2310         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2311 }
2312 
2313 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2314 {
2315         struct snd_pcm_runtime *runtime;
2316         runtime = substream->runtime;
2317         kvfree(runtime->oss.buffer);
2318         runtime->oss.buffer = NULL;
2319 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2320         snd_pcm_oss_plugin_clear(substream);
2321 #endif
2322         substream->oss.oss = 0;
2323 }
2324 
2325 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2326                                        struct snd_pcm_oss_setup *setup,
2327                                        int minor)
2328 {
2329         struct snd_pcm_runtime *runtime;
2330 
2331         substream->oss.oss = 1;
2332         substream->oss.setup = *setup;
2333         if (setup->nonblock)
2334                 substream->f_flags |= O_NONBLOCK;
2335         else if (setup->block)
2336                 substream->f_flags &= ~O_NONBLOCK;
2337         runtime = substream->runtime;
2338         runtime->oss.params = 1;
2339         runtime->oss.trigger = 1;
2340         runtime->oss.rate = 8000;
2341         mutex_init(&runtime->oss.params_lock);
2342         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2343         case SNDRV_MINOR_OSS_PCM_8:
2344                 runtime->oss.format = AFMT_U8;
2345                 break;
2346         case SNDRV_MINOR_OSS_PCM_16:
2347                 runtime->oss.format = AFMT_S16_LE;
2348                 break;
2349         default:
2350                 runtime->oss.format = AFMT_MU_LAW;
2351         }
2352         runtime->oss.channels = 1;
2353         runtime->oss.fragshift = 0;
2354         runtime->oss.maxfrags = 0;
2355         runtime->oss.subdivision = 0;
2356         substream->pcm_release = snd_pcm_oss_release_substream;
2357         atomic_set(&runtime->oss.rw_ref, 0);
2358 }
2359 
2360 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2361 {
2362         int cidx;
2363         if (!pcm_oss_file)
2364                 return 0;
2365         for (cidx = 0; cidx < 2; ++cidx) {
2366                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2367                 if (substream)
2368                         snd_pcm_release_substream(substream);
2369         }
2370         kfree(pcm_oss_file);
2371         return 0;
2372 }
2373 
2374 static int snd_pcm_oss_open_file(struct file *file,
2375                                  struct snd_pcm *pcm,
2376                                  struct snd_pcm_oss_file **rpcm_oss_file,
2377                                  int minor,
2378                                  struct snd_pcm_oss_setup *setup)
2379 {
2380         int idx, err;
2381         struct snd_pcm_oss_file *pcm_oss_file;
2382         struct snd_pcm_substream *substream;
2383         fmode_t f_mode = file->f_mode;
2384 
2385         if (rpcm_oss_file)
2386                 *rpcm_oss_file = NULL;
2387 
2388         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2389         if (pcm_oss_file == NULL)
2390                 return -ENOMEM;
2391 
2392         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2393             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2394                 f_mode = FMODE_WRITE;
2395 
2396         file->f_flags &= ~O_APPEND;
2397         for (idx = 0; idx < 2; idx++) {
2398                 if (setup[idx].disable)
2399                         continue;
2400                 if (! pcm->streams[idx].substream_count)
2401                         continue; /* no matching substream */
2402                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2403                         if (! (f_mode & FMODE_WRITE))
2404                                 continue;
2405                 } else {
2406                         if (! (f_mode & FMODE_READ))
2407                                 continue;
2408                 }
2409                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2410                 if (err < 0) {
2411                         snd_pcm_oss_release_file(pcm_oss_file);
2412                         return err;
2413                 }
2414 
2415                 pcm_oss_file->streams[idx] = substream;
2416                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2417         }
2418         
2419         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2420                 snd_pcm_oss_release_file(pcm_oss_file);
2421                 return -EINVAL;
2422         }
2423 
2424         file->private_data = pcm_oss_file;
2425         if (rpcm_oss_file)
2426                 *rpcm_oss_file = pcm_oss_file;
2427         return 0;
2428 }
2429 
2430 
2431 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2432 {
2433         unsigned int idx;
2434 
2435         if (snd_BUG_ON(!task || !name || size < 2))
2436                 return -EINVAL;
2437         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2438                 name[idx] = task->comm[idx];
2439         name[idx] = '\0';
2440         return 0;
2441 }
2442 
2443 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2444 {
2445         int err;
2446         char task_name[32];
2447         struct snd_pcm *pcm;
2448         struct snd_pcm_oss_file *pcm_oss_file;
2449         struct snd_pcm_oss_setup setup[2];
2450         int nonblock;
2451         wait_queue_entry_t wait;
2452 
2453         err = nonseekable_open(inode, file);
2454         if (err < 0)
2455                 return err;
2456 
2457         pcm = snd_lookup_oss_minor_data(iminor(inode),
2458                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2459         if (pcm == NULL) {
2460                 err = -ENODEV;
2461                 goto __error1;
2462         }
2463         err = snd_card_file_add(pcm->card, file);
2464         if (err < 0)
2465                 goto __error1;
2466         if (!try_module_get(pcm->card->module)) {
2467                 err = -EFAULT;
2468                 goto __error2;
2469         }
2470         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2471                 err = -EFAULT;
2472                 goto __error;
2473         }
2474         memset(setup, 0, sizeof(setup));
2475         if (file->f_mode & FMODE_WRITE)
2476                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2477                                            task_name, &setup[0]);
2478         if (file->f_mode & FMODE_READ)
2479                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2480                                            task_name, &setup[1]);
2481 
2482         nonblock = !!(file->f_flags & O_NONBLOCK);
2483         if (!nonblock)
2484                 nonblock = nonblock_open;
2485 
2486         init_waitqueue_entry(&wait, current);
2487         add_wait_queue(&pcm->open_wait, &wait);
2488         mutex_lock(&pcm->open_mutex);
2489         while (1) {
2490                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2491                                             iminor(inode), setup);
2492                 if (err >= 0)
2493                         break;
2494                 if (err == -EAGAIN) {
2495                         if (nonblock) {
2496                                 err = -EBUSY;
2497                                 break;
2498                         }
2499                 } else
2500                         break;
2501                 set_current_state(TASK_INTERRUPTIBLE);
2502                 mutex_unlock(&pcm->open_mutex);
2503                 schedule();
2504                 mutex_lock(&pcm->open_mutex);
2505                 if (pcm->card->shutdown) {
2506                         err = -ENODEV;
2507                         break;
2508                 }
2509                 if (signal_pending(current)) {
2510                         err = -ERESTARTSYS;
2511                         break;
2512                 }
2513         }
2514         remove_wait_queue(&pcm->open_wait, &wait);
2515         mutex_unlock(&pcm->open_mutex);
2516         if (err < 0)
2517                 goto __error;
2518         snd_card_unref(pcm->card);
2519         return err;
2520 
2521       __error:
2522         module_put(pcm->card->module);
2523       __error2:
2524         snd_card_file_remove(pcm->card, file);
2525       __error1:
2526         if (pcm)
2527                 snd_card_unref(pcm->card);
2528         return err;
2529 }
2530 
2531 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2532 {
2533         struct snd_pcm *pcm;
2534         struct snd_pcm_substream *substream;
2535         struct snd_pcm_oss_file *pcm_oss_file;
2536 
2537         pcm_oss_file = file->private_data;
2538         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2539         if (substream == NULL)
2540                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2541         if (snd_BUG_ON(!substream))
2542                 return -ENXIO;
2543         pcm = substream->pcm;
2544         if (!pcm->card->shutdown)
2545                 snd_pcm_oss_sync(pcm_oss_file);
2546         mutex_lock(&pcm->open_mutex);
2547         snd_pcm_oss_release_file(pcm_oss_file);
2548         mutex_unlock(&pcm->open_mutex);
2549         wake_up(&pcm->open_wait);
2550         module_put(pcm->card->module);
2551         snd_card_file_remove(pcm->card, file);
2552         return 0;
2553 }
2554 
2555 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2556 {
2557         struct snd_pcm_oss_file *pcm_oss_file;
2558         int __user *p = (int __user *)arg;
2559         int res;
2560 
2561         pcm_oss_file = file->private_data;
2562         if (cmd == OSS_GETVERSION)
2563                 return put_user(SNDRV_OSS_VERSION, p);
2564         if (cmd == OSS_ALSAEMULVER)
2565                 return put_user(1, p);
2566 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2567         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2568                 struct snd_pcm_substream *substream;
2569                 int idx;
2570                 for (idx = 0; idx < 2; ++idx) {
2571                         substream = pcm_oss_file->streams[idx];
2572                         if (substream != NULL)
2573                                 break;
2574                 }
2575                 if (snd_BUG_ON(idx >= 2))
2576                         return -ENXIO;
2577                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2578         }
2579 #endif
2580         if (((cmd >> 8) & 0xff) != 'P')
2581                 return -EINVAL;
2582 #ifdef OSS_DEBUG
2583         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2584 #endif
2585         switch (cmd) {
2586         case SNDCTL_DSP_RESET:
2587                 return snd_pcm_oss_reset(pcm_oss_file);
2588         case SNDCTL_DSP_SYNC:
2589                 return snd_pcm_oss_sync(pcm_oss_file);
2590         case SNDCTL_DSP_SPEED:
2591                 if (get_user(res, p))
2592                         return -EFAULT;
2593                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2594                         return res;
2595                 return put_user(res, p);
2596         case SOUND_PCM_READ_RATE:
2597                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2598                 if (res < 0)
2599                         return res;
2600                 return put_user(res, p);
2601         case SNDCTL_DSP_STEREO:
2602                 if (get_user(res, p))
2603                         return -EFAULT;
2604                 res = res > 0 ? 2 : 1;
2605                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2606                         return res;
2607                 return put_user(--res, p);
2608         case SNDCTL_DSP_GETBLKSIZE:
2609                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2610                 if (res < 0)
2611                         return res;
2612                 return put_user(res, p);
2613         case SNDCTL_DSP_SETFMT:
2614                 if (get_user(res, p))
2615                         return -EFAULT;
2616                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2617                 if (res < 0)
2618                         return res;
2619                 return put_user(res, p);
2620         case SOUND_PCM_READ_BITS:
2621                 res = snd_pcm_oss_get_format(pcm_oss_file);
2622                 if (res < 0)
2623                         return res;
2624                 return put_user(res, p);
2625         case SNDCTL_DSP_CHANNELS:
2626                 if (get_user(res, p))
2627                         return -EFAULT;
2628                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2629                 if (res < 0)
2630                         return res;
2631                 return put_user(res, p);
2632         case SOUND_PCM_READ_CHANNELS:
2633                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2634                 if (res < 0)
2635                         return res;
2636                 return put_user(res, p);
2637         case SOUND_PCM_WRITE_FILTER:
2638         case SOUND_PCM_READ_FILTER:
2639                 return -EIO;
2640         case SNDCTL_DSP_POST:
2641                 return snd_pcm_oss_post(pcm_oss_file);
2642         case SNDCTL_DSP_SUBDIVIDE:
2643                 if (get_user(res, p))
2644                         return -EFAULT;
2645                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2646                 if (res < 0)
2647                         return res;
2648                 return put_user(res, p);
2649         case SNDCTL_DSP_SETFRAGMENT:
2650                 if (get_user(res, p))
2651                         return -EFAULT;
2652                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2653         case SNDCTL_DSP_GETFMTS:
2654                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2655                 if (res < 0)
2656                         return res;
2657                 return put_user(res, p);
2658         case SNDCTL_DSP_GETOSPACE:
2659         case SNDCTL_DSP_GETISPACE:
2660                 return snd_pcm_oss_get_space(pcm_oss_file,
2661                         cmd == SNDCTL_DSP_GETISPACE ?
2662                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2663                         (struct audio_buf_info __user *) arg);
2664         case SNDCTL_DSP_NONBLOCK:
2665                 return snd_pcm_oss_nonblock(file);
2666         case SNDCTL_DSP_GETCAPS:
2667                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2668                 if (res < 0)
2669                         return res;
2670                 return put_user(res, p);
2671         case SNDCTL_DSP_GETTRIGGER:
2672                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2673                 if (res < 0)
2674                         return res;
2675                 return put_user(res, p);
2676         case SNDCTL_DSP_SETTRIGGER:
2677                 if (get_user(res, p))
2678                         return -EFAULT;
2679                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2680         case SNDCTL_DSP_GETIPTR:
2681         case SNDCTL_DSP_GETOPTR:
2682                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2683                         cmd == SNDCTL_DSP_GETIPTR ?
2684                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2685                         (struct count_info __user *) arg);
2686         case SNDCTL_DSP_MAPINBUF:
2687         case SNDCTL_DSP_MAPOUTBUF:
2688                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2689                         cmd == SNDCTL_DSP_MAPINBUF ?
2690                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2691                         (struct buffmem_desc __user *) arg);
2692         case SNDCTL_DSP_SETSYNCRO:
2693                 /* stop DMA now.. */
2694                 return 0;
2695         case SNDCTL_DSP_SETDUPLEX:
2696                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2697                         return 0;
2698                 return -EIO;
2699         case SNDCTL_DSP_GETODELAY:
2700                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2701                 if (res < 0) {
2702                         /* it's for sure, some broken apps don't check for error codes */
2703                         put_user(0, p);
2704                         return res;
2705                 }
2706                 return put_user(res, p);
2707         case SNDCTL_DSP_PROFILE:
2708                 return 0;       /* silently ignore */
2709         default:
2710                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2711         }
2712         return -EINVAL;
2713 }
2714 
2715 #ifdef CONFIG_COMPAT
2716 /* all compatible */
2717 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2718                                      unsigned long arg)
2719 {
2720         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2721 }
2722 #else
2723 #define snd_pcm_oss_ioctl_compat        NULL
2724 #endif
2725 
2726 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2727 {
2728         struct snd_pcm_oss_file *pcm_oss_file;
2729         struct snd_pcm_substream *substream;
2730 
2731         pcm_oss_file = file->private_data;
2732         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2733         if (substream == NULL)
2734                 return -ENXIO;
2735         substream->f_flags = file->f_flags & O_NONBLOCK;
2736 #ifndef OSS_DEBUG
2737         return snd_pcm_oss_read1(substream, buf, count);
2738 #else
2739         {
2740                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2741                 pcm_dbg(substream->pcm,
2742                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2743                         (long)count, (long)res);
2744                 return res;
2745         }
2746 #endif
2747 }
2748 
2749 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2750 {
2751         struct snd_pcm_oss_file *pcm_oss_file;
2752         struct snd_pcm_substream *substream;
2753         long result;
2754 
2755         pcm_oss_file = file->private_data;
2756         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2757         if (substream == NULL)
2758                 return -ENXIO;
2759         substream->f_flags = file->f_flags & O_NONBLOCK;
2760         result = snd_pcm_oss_write1(substream, buf, count);
2761 #ifdef OSS_DEBUG
2762         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2763                (long)count, (long)result);
2764 #endif
2765         return result;
2766 }
2767 
2768 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2769 {
2770         struct snd_pcm_runtime *runtime = substream->runtime;
2771         if (atomic_read(&substream->mmap_count))
2772                 return runtime->oss.prev_hw_ptr_period !=
2773                                                 get_hw_ptr_period(runtime);
2774         else
2775                 return snd_pcm_playback_avail(runtime) >=
2776                                                 runtime->oss.period_frames;
2777 }
2778 
2779 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2780 {
2781         struct snd_pcm_runtime *runtime = substream->runtime;
2782         if (atomic_read(&substream->mmap_count))
2783                 return runtime->oss.prev_hw_ptr_period !=
2784                                                 get_hw_ptr_period(runtime);
2785         else
2786                 return snd_pcm_capture_avail(runtime) >=
2787                                                 runtime->oss.period_frames;
2788 }
2789 
2790 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2791 {
2792         struct snd_pcm_oss_file *pcm_oss_file;
2793         __poll_t mask;
2794         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2795         
2796         pcm_oss_file = file->private_data;
2797 
2798         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2799         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2800 
2801         mask = 0;
2802         if (psubstream != NULL) {
2803                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2804                 poll_wait(file, &runtime->sleep, wait);
2805                 snd_pcm_stream_lock_irq(psubstream);
2806                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2807                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2808                      snd_pcm_oss_playback_ready(psubstream)))
2809                         mask |= EPOLLOUT | EPOLLWRNORM;
2810                 snd_pcm_stream_unlock_irq(psubstream);
2811         }
2812         if (csubstream != NULL) {
2813                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2814                 snd_pcm_state_t ostate;
2815                 poll_wait(file, &runtime->sleep, wait);
2816                 snd_pcm_stream_lock_irq(csubstream);
2817                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2818                     snd_pcm_oss_capture_ready(csubstream))
2819                         mask |= EPOLLIN | EPOLLRDNORM;
2820                 snd_pcm_stream_unlock_irq(csubstream);
2821                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2822                         struct snd_pcm_oss_file ofile;
2823                         memset(&ofile, 0, sizeof(ofile));
2824                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2825                         runtime->oss.trigger = 0;
2826                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2827                 }
2828         }
2829 
2830         return mask;
2831 }
2832 
2833 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2834 {
2835         struct snd_pcm_oss_file *pcm_oss_file;
2836         struct snd_pcm_substream *substream = NULL;
2837         struct snd_pcm_runtime *runtime;
2838         int err;
2839 
2840 #ifdef OSS_DEBUG
2841         pr_debug("pcm_oss: mmap begin\n");
2842 #endif
2843         pcm_oss_file = file->private_data;
2844         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2845         case VM_READ | VM_WRITE:
2846                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2847                 if (substream)
2848                         break;
2849                 /* Fall through */
2850         case VM_READ:
2851                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2852                 break;
2853         case VM_WRITE:
2854                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2855                 break;
2856         default:
2857                 return -EINVAL;
2858         }
2859         /* set VM_READ access as well to fix memset() routines that do
2860            reads before writes (to improve performance) */
2861         area->vm_flags |= VM_READ;
2862         if (substream == NULL)
2863                 return -ENXIO;
2864         runtime = substream->runtime;
2865         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2866                 return -EIO;
2867         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2868                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2869         else
2870                 return -EIO;
2871         
2872         if (runtime->oss.params) {
2873                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2874                  * between mmap_sem and params_lock taken by
2875                  * copy_from/to_user() in snd_pcm_oss_write/read()
2876                  */
2877                 err = snd_pcm_oss_change_params(substream, true);
2878                 if (err < 0)
2879                         return err;
2880         }
2881 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2882         if (runtime->oss.plugin_first != NULL)
2883                 return -EIO;
2884 #endif
2885 
2886         if (area->vm_pgoff != 0)
2887                 return -EINVAL;
2888 
2889         err = snd_pcm_mmap_data(substream, file, area);
2890         if (err < 0)
2891                 return err;
2892         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2893         runtime->silence_threshold = 0;
2894         runtime->silence_size = 0;
2895 #ifdef OSS_DEBUG
2896         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2897                runtime->oss.mmap_bytes);
2898 #endif
2899         /* In mmap mode we never stop */
2900         runtime->stop_threshold = runtime->boundary;
2901 
2902         return 0;
2903 }
2904 
2905 #ifdef CONFIG_SND_VERBOSE_PROCFS
2906 /*
2907  *  /proc interface
2908  */
2909 
2910 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2911                                   struct snd_info_buffer *buffer)
2912 {
2913         struct snd_pcm_str *pstr = entry->private_data;
2914         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2915         mutex_lock(&pstr->oss.setup_mutex);
2916         while (setup) {
2917                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2918                             setup->task_name,
2919                             setup->periods,
2920                             setup->period_size,
2921                             setup->disable ? " disable" : "",
2922                             setup->direct ? " direct" : "",
2923                             setup->block ? " block" : "",
2924                             setup->nonblock ? " non-block" : "",
2925                             setup->partialfrag ? " partial-frag" : "",
2926                             setup->nosilence ? " no-silence" : "");
2927                 setup = setup->next;
2928         }
2929         mutex_unlock(&pstr->oss.setup_mutex);
2930 }
2931 
2932 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2933 {
2934         struct snd_pcm_oss_setup *setup, *setupn;
2935 
2936         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2937              setup; setup = setupn) {
2938                 setupn = setup->next;
2939                 kfree(setup->task_name);
2940                 kfree(setup);
2941         }
2942         pstr->oss.setup_list = NULL;
2943 }
2944 
2945 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2946                                    struct snd_info_buffer *buffer)
2947 {
2948         struct snd_pcm_str *pstr = entry->private_data;
2949         char line[128], str[32], task_name[32];
2950         const char *ptr;
2951         int idx1;
2952         struct snd_pcm_oss_setup *setup, *setup1, template;
2953 
2954         while (!snd_info_get_line(buffer, line, sizeof(line))) {
2955                 mutex_lock(&pstr->oss.setup_mutex);
2956                 memset(&template, 0, sizeof(template));
2957                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2958                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2959                         snd_pcm_oss_proc_free_setup_list(pstr);
2960                         mutex_unlock(&pstr->oss.setup_mutex);
2961                         continue;
2962                 }
2963                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2964                         if (!strcmp(setup->task_name, task_name)) {
2965                                 template = *setup;
2966                                 break;
2967                         }
2968                 }
2969                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2970                 template.periods = simple_strtoul(str, NULL, 10);
2971                 ptr = snd_info_get_str(str, ptr, sizeof(str));
2972                 template.period_size = simple_strtoul(str, NULL, 10);
2973                 for (idx1 = 31; idx1 >= 0; idx1--)
2974                         if (template.period_size & (1 << idx1))
2975                                 break;
2976                 for (idx1--; idx1 >= 0; idx1--)
2977                         template.period_size &= ~(1 << idx1);
2978                 do {
2979                         ptr = snd_info_get_str(str, ptr, sizeof(str));
2980                         if (!strcmp(str, "disable")) {
2981                                 template.disable = 1;
2982                         } else if (!strcmp(str, "direct")) {
2983                                 template.direct = 1;
2984                         } else if (!strcmp(str, "block")) {
2985                                 template.block = 1;
2986                         } else if (!strcmp(str, "non-block")) {
2987                                 template.nonblock = 1;
2988                         } else if (!strcmp(str, "partial-frag")) {
2989                                 template.partialfrag = 1;
2990                         } else if (!strcmp(str, "no-silence")) {
2991                                 template.nosilence = 1;
2992                         } else if (!strcmp(str, "buggy-ptr")) {
2993                                 template.buggyptr = 1;
2994                         }
2995                 } while (*str);
2996                 if (setup == NULL) {
2997                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
2998                         if (! setup) {
2999                                 buffer->error = -ENOMEM;
3000                                 mutex_unlock(&pstr->oss.setup_mutex);
3001                                 return;
3002                         }
3003                         if (pstr->oss.setup_list == NULL)
3004                                 pstr->oss.setup_list = setup;
3005                         else {
3006                                 for (setup1 = pstr->oss.setup_list;
3007                                      setup1->next; setup1 = setup1->next);
3008                                 setup1->next = setup;
3009                         }
3010                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3011                         if (! template.task_name) {
3012                                 kfree(setup);
3013                                 buffer->error = -ENOMEM;
3014                                 mutex_unlock(&pstr->oss.setup_mutex);
3015                                 return;
3016                         }
3017                 }
3018                 *setup = template;
3019                 mutex_unlock(&pstr->oss.setup_mutex);
3020         }
3021 }
3022 
3023 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3024 {
3025         int stream;
3026         for (stream = 0; stream < 2; ++stream) {
3027                 struct snd_info_entry *entry;
3028                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3029                 if (pstr->substream_count == 0)
3030                         continue;
3031                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3032                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3033                         entry->mode = S_IFREG | 0644;
3034                         entry->c.text.read = snd_pcm_oss_proc_read;
3035                         entry->c.text.write = snd_pcm_oss_proc_write;
3036                         entry->private_data = pstr;
3037                         if (snd_info_register(entry) < 0) {
3038                                 snd_info_free_entry(entry);
3039                                 entry = NULL;
3040                         }
3041                 }
3042                 pstr->oss.proc_entry = entry;
3043         }
3044 }
3045 
3046 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3047 {
3048         int stream;
3049         for (stream = 0; stream < 2; ++stream) {
3050                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3051                 snd_info_free_entry(pstr->oss.proc_entry);
3052                 pstr->oss.proc_entry = NULL;
3053                 snd_pcm_oss_proc_free_setup_list(pstr);
3054         }
3055 }
3056 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3057 #define snd_pcm_oss_proc_init(pcm)
3058 #define snd_pcm_oss_proc_done(pcm)
3059 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3060 
3061 /*
3062  *  ENTRY functions
3063  */
3064 
3065 static const struct file_operations snd_pcm_oss_f_reg =
3066 {
3067         .owner =        THIS_MODULE,
3068         .read =         snd_pcm_oss_read,
3069         .write =        snd_pcm_oss_write,
3070         .open =         snd_pcm_oss_open,
3071         .release =      snd_pcm_oss_release,
3072         .llseek =       no_llseek,
3073         .poll =         snd_pcm_oss_poll,
3074         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3075         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3076         .mmap =         snd_pcm_oss_mmap,
3077 };
3078 
3079 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3080 {
3081         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3082                                     pcm->card, index, &snd_pcm_oss_f_reg,
3083                                     pcm) < 0) {
3084                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3085                            pcm->card->number, pcm->device);
3086         }
3087 }
3088 
3089 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3090 {
3091         pcm->oss.reg = 0;
3092         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3093                 char name[128];
3094                 int duplex;
3095                 register_oss_dsp(pcm, 0);
3096                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 && 
3097                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count && 
3098                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3099                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3100 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3101                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3102                                       pcm->card->number,
3103                                       name);
3104 #endif
3105                 pcm->oss.reg++;
3106                 pcm->oss.reg_mask |= 1;
3107         }
3108         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3109                 register_oss_dsp(pcm, 1);
3110                 pcm->oss.reg++;
3111                 pcm->oss.reg_mask |= 2;
3112         }
3113 
3114         if (pcm->oss.reg)
3115                 snd_pcm_oss_proc_init(pcm);
3116 
3117         return 0;
3118 }
3119 
3120 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3121 {
3122         if (pcm->oss.reg) {
3123                 if (pcm->oss.reg_mask & 1) {
3124                         pcm->oss.reg_mask &= ~1;
3125                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3126                                                   pcm->card, 0);
3127                 }
3128                 if (pcm->oss.reg_mask & 2) {
3129                         pcm->oss.reg_mask &= ~2;
3130                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3131                                                   pcm->card, 1);
3132                 }
3133                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3134 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3135                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3136 #endif
3137                 }
3138                 pcm->oss.reg = 0;
3139         }
3140         return 0;
3141 }
3142 
3143 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3144 {
3145         snd_pcm_oss_disconnect_minor(pcm);
3146         snd_pcm_oss_proc_done(pcm);
3147         return 0;
3148 }
3149 
3150 static struct snd_pcm_notify snd_pcm_oss_notify =
3151 {
3152         .n_register =   snd_pcm_oss_register_minor,
3153         .n_disconnect = snd_pcm_oss_disconnect_minor,
3154         .n_unregister = snd_pcm_oss_unregister_minor,
3155 };
3156 
3157 static int __init alsa_pcm_oss_init(void)
3158 {
3159         int i;
3160         int err;
3161 
3162         /* check device map table */
3163         for (i = 0; i < SNDRV_CARDS; i++) {
3164                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3165                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3166                                    i, dsp_map[i]);
3167                         dsp_map[i] = 0;
3168                 }
3169                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3170                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3171                                    i, adsp_map[i]);
3172                         adsp_map[i] = 1;
3173                 }
3174         }
3175         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3176                 return err;
3177         return 0;
3178 }
3179 
3180 static void __exit alsa_pcm_oss_exit(void)
3181 {
3182         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3183 }
3184 
3185 module_init(alsa_pcm_oss_init)
3186 module_exit(alsa_pcm_oss_exit)

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