drivers/media/pci/bt8xx/bttv-input.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ir_handle_key
ir_enltv_handle_key
bttv_input_irq
bttv_input_timer
bttv_rc5_decode
bttv_rc5_timer_end
bttv_rc5_irq
bttv_ir_start
bttv_ir_stop
get_key_pv951
init_bttv_i2c_ir
bttv_input_init
bttv_input_fini
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (c) 2003 Gerd Knorr
   5  * Copyright (c) 2003 Pavel Machek
   6  */
   7 
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9 
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/input.h>
  15 #include <linux/slab.h>
  16 
  17 #include "bttv.h"
  18 #include "bttvp.h"
  19 
  20 
  21 static int ir_debug;
  22 module_param(ir_debug, int, 0644);
  23 
  24 static int ir_rc5_remote_gap = 885;
  25 module_param(ir_rc5_remote_gap, int, 0644);
  26 
  27 #undef dprintk
  28 #define dprintk(fmt, ...)                       \
  29 do {                                            \
  30         if (ir_debug >= 1)                      \
  31                 pr_info(fmt, ##__VA_ARGS__);    \
  32 } while (0)
  33 
  34 #define DEVNAME "bttv-input"
  35 
  36 #define MODULE_NAME "bttv"
  37 
  38 /* ---------------------------------------------------------------------- */
  39 
  40 static void ir_handle_key(struct bttv *btv)
  41 {
  42         struct bttv_ir *ir = btv->remote;
  43         u32 gpio,data;
  44 
  45         /* read gpio value */
  46         gpio = bttv_gpio_read(&btv->c);
  47         if (ir->polling) {
  48                 if (ir->last_gpio == gpio)
  49                         return;
  50                 ir->last_gpio = gpio;
  51         }
  52 
  53         /* extract data */
  54         data = ir_extract_bits(gpio, ir->mask_keycode);
  55         dprintk("irq gpio=0x%x code=%d | %s%s%s\n",
  56                 gpio, data,
  57                 ir->polling               ? "poll"  : "irq",
  58                 (gpio & ir->mask_keydown) ? " down" : "",
  59                 (gpio & ir->mask_keyup)   ? " up"   : "");
  60 
  61         if ((ir->mask_keydown && (gpio & ir->mask_keydown)) ||
  62             (ir->mask_keyup   && !(gpio & ir->mask_keyup))) {
  63                 rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data, 0);
  64         } else {
  65                 /* HACK: Probably, ir->mask_keydown is missing
  66                    for this board */
  67                 if (btv->c.type == BTTV_BOARD_WINFAST2000)
  68                         rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
  69                                              0);
  70 
  71                 rc_keyup(ir->dev);
  72         }
  73 }
  74 
  75 static void ir_enltv_handle_key(struct bttv *btv)
  76 {
  77         struct bttv_ir *ir = btv->remote;
  78         u32 gpio, data, keyup;
  79 
  80         /* read gpio value */
  81         gpio = bttv_gpio_read(&btv->c);
  82 
  83         /* extract data */
  84         data = ir_extract_bits(gpio, ir->mask_keycode);
  85 
  86         /* Check if it is keyup */
  87         keyup = (gpio & ir->mask_keyup) ? 1UL << 31 : 0;
  88 
  89         if ((ir->last_gpio & 0x7f) != data) {
  90                 dprintk("gpio=0x%x code=%d | %s\n",
  91                         gpio, data,
  92                         (gpio & ir->mask_keyup) ? " up" : "up/down");
  93 
  94                 rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data, 0);
  95                 if (keyup)
  96                         rc_keyup(ir->dev);
  97         } else {
  98                 if ((ir->last_gpio & 1UL << 31) == keyup)
  99                         return;
 100 
 101                 dprintk("(cnt) gpio=0x%x code=%d | %s\n",
 102                         gpio, data,
 103                         (gpio & ir->mask_keyup) ? " up" : "down");
 104 
 105                 if (keyup)
 106                         rc_keyup(ir->dev);
 107                 else
 108                         rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
 109                                              0);
 110         }
 111 
 112         ir->last_gpio = data | keyup;
 113 }
 114 
 115 static int bttv_rc5_irq(struct bttv *btv);
 116 
 117 void bttv_input_irq(struct bttv *btv)
 118 {
 119         struct bttv_ir *ir = btv->remote;
 120 
 121         if (ir->rc5_gpio)
 122                 bttv_rc5_irq(btv);
 123         else if (!ir->polling)
 124                 ir_handle_key(btv);
 125 }
 126 
 127 static void bttv_input_timer(struct timer_list *t)
 128 {
 129         struct bttv_ir *ir = from_timer(ir, t, timer);
 130         struct bttv *btv = ir->btv;
 131 
 132         if (btv->c.type == BTTV_BOARD_ENLTV_FM_2)
 133                 ir_enltv_handle_key(btv);
 134         else
 135                 ir_handle_key(btv);
 136         mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
 137 }
 138 
 139 /*
 140  * FIXME: Nebula digi uses the legacy way to decode RC5, instead of relying
 141  * on the rc-core way. As we need to be sure that both IRQ transitions are
 142  * properly triggered, Better to touch it only with this hardware for
 143  * testing.
 144  */
 145 
 146 #define RC5_START(x)    (((x) >> 12) & 0x03)
 147 #define RC5_TOGGLE(x)   (((x) >> 11) & 0x01)
 148 #define RC5_ADDR(x)     (((x) >> 6)  & 0x1f)
 149 #define RC5_INSTR(x)    (((x) >> 0)  & 0x3f)
 150 
 151 /* decode raw bit pattern to RC5 code */
 152 static u32 bttv_rc5_decode(unsigned int code)
 153 {
 154         unsigned int org_code = code;
 155         unsigned int pair;
 156         unsigned int rc5 = 0;
 157         int i;
 158 
 159         for (i = 0; i < 14; ++i) {
 160                 pair = code & 0x3;
 161                 code >>= 2;
 162 
 163                 rc5 <<= 1;
 164                 switch (pair) {
 165                 case 0:
 166                 case 2:
 167                         break;
 168                 case 1:
 169                         rc5 |= 1;
 170                 break;
 171                 case 3:
 172                         dprintk("rc5_decode(%x) bad code\n",
 173                                 org_code);
 174                         return 0;
 175                 }
 176         }
 177         dprintk("code=%x, rc5=%x, start=%x, toggle=%x, address=%x, instr=%x\n",
 178                 rc5, org_code, RC5_START(rc5),
 179                 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
 180         return rc5;
 181 }
 182 
 183 static void bttv_rc5_timer_end(struct timer_list *t)
 184 {
 185         struct bttv_ir *ir = from_timer(ir, t, timer);
 186         ktime_t tv;
 187         u32 gap, rc5, scancode;
 188         u8 toggle, command, system;
 189 
 190         /* get time */
 191         tv = ktime_get();
 192 
 193         gap = ktime_to_us(ktime_sub(tv, ir->base_time));
 194         /* avoid overflow with gap >1s */
 195         if (gap > USEC_PER_SEC) {
 196                 gap = 200000;
 197         }
 198         /* signal we're ready to start a new code */
 199         ir->active = false;
 200 
 201         /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
 202         if (gap < 28000) {
 203                 dprintk("spurious timer_end\n");
 204                 return;
 205         }
 206 
 207         if (ir->last_bit < 20) {
 208                 /* ignore spurious codes (caused by light/other remotes) */
 209                 dprintk("short code: %x\n", ir->code);
 210                 return;
 211         }
 212 
 213         ir->code = (ir->code << ir->shift_by) | 1;
 214         rc5 = bttv_rc5_decode(ir->code);
 215 
 216         toggle = RC5_TOGGLE(rc5);
 217         system = RC5_ADDR(rc5);
 218         command = RC5_INSTR(rc5);
 219 
 220         switch (RC5_START(rc5)) {
 221         case 0x3:
 222                 break;
 223         case 0x2:
 224                 command += 0x40;
 225                 break;
 226         default:
 227                 return;
 228         }
 229 
 230         scancode = RC_SCANCODE_RC5(system, command);
 231         rc_keydown(ir->dev, RC_PROTO_RC5, scancode, toggle);
 232         dprintk("scancode %x, toggle %x\n", scancode, toggle);
 233 }
 234 
 235 static int bttv_rc5_irq(struct bttv *btv)
 236 {
 237         struct bttv_ir *ir = btv->remote;
 238         ktime_t tv;
 239         u32 gpio;
 240         u32 gap;
 241         unsigned long current_jiffies;
 242 
 243         /* read gpio port */
 244         gpio = bttv_gpio_read(&btv->c);
 245 
 246         /* get time of bit */
 247         current_jiffies = jiffies;
 248         tv = ktime_get();
 249 
 250         gap = ktime_to_us(ktime_sub(tv, ir->base_time));
 251         /* avoid overflow with gap >1s */
 252         if (gap > USEC_PER_SEC) {
 253                 gap = 200000;
 254         }
 255 
 256         dprintk("RC5 IRQ: gap %d us for %s\n",
 257                 gap, (gpio & 0x20) ? "mark" : "space");
 258 
 259         /* remote IRQ? */
 260         if (!(gpio & 0x20))
 261                 return 0;
 262 
 263         /* active code => add bit */
 264         if (ir->active) {
 265                 /* only if in the code (otherwise spurious IRQ or timer
 266                    late) */
 267                 if (ir->last_bit < 28) {
 268                         ir->last_bit = (gap - ir_rc5_remote_gap / 2) /
 269                             ir_rc5_remote_gap;
 270                         ir->code |= 1 << ir->last_bit;
 271                 }
 272                 /* starting new code */
 273         } else {
 274                 ir->active = true;
 275                 ir->code = 0;
 276                 ir->base_time = tv;
 277                 ir->last_bit = 0;
 278 
 279                 mod_timer(&ir->timer, current_jiffies + msecs_to_jiffies(30));
 280         }
 281 
 282         /* toggle GPIO pin 4 to reset the irq */
 283         bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
 284         bttv_gpio_write(&btv->c, gpio | (1 << 4));
 285         return 1;
 286 }
 287 
 288 /* ---------------------------------------------------------------------- */
 289 
 290 static void bttv_ir_start(struct bttv_ir *ir)
 291 {
 292         if (ir->polling) {
 293                 timer_setup(&ir->timer, bttv_input_timer, 0);
 294                 ir->timer.expires  = jiffies + msecs_to_jiffies(1000);
 295                 add_timer(&ir->timer);
 296         } else if (ir->rc5_gpio) {
 297                 /* set timer_end for code completion */
 298                 timer_setup(&ir->timer, bttv_rc5_timer_end, 0);
 299                 ir->shift_by = 1;
 300                 ir->rc5_remote_gap = ir_rc5_remote_gap;
 301         }
 302 }
 303 
 304 static void bttv_ir_stop(struct bttv *btv)
 305 {
 306         if (btv->remote->polling)
 307                 del_timer_sync(&btv->remote->timer);
 308 
 309         if (btv->remote->rc5_gpio) {
 310                 u32 gpio;
 311 
 312                 del_timer_sync(&btv->remote->timer);
 313 
 314                 gpio = bttv_gpio_read(&btv->c);
 315                 bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
 316         }
 317 }
 318 
 319 /*
 320  * Get_key functions used by I2C remotes
 321  */
 322 
 323 static int get_key_pv951(struct IR_i2c *ir, enum rc_proto *protocol,
 324                          u32 *scancode, u8 *toggle)
 325 {
 326         int rc;
 327         unsigned char b;
 328 
 329         /* poll IR chip */
 330         rc = i2c_master_recv(ir->c, &b, 1);
 331         if (rc != 1) {
 332                 dprintk("read error\n");
 333                 if (rc < 0)
 334                         return rc;
 335                 return -EIO;
 336         }
 337 
 338         /* ignore 0xaa */
 339         if (b==0xaa)
 340                 return 0;
 341         dprintk("key %02x\n", b);
 342 
 343         /*
 344          * NOTE:
 345          * lirc_i2c maps the pv951 code as:
 346          *      addr = 0x61D6
 347          *      cmd = bit_reverse (b)
 348          * So, it seems that this device uses NEC extended
 349          * I decided to not fix the table, due to two reasons:
 350          *      1) Without the actual device, this is only a guess;
 351          *      2) As the addr is not reported via I2C, nor can be changed,
 352          *         the device is bound to the vendor-provided RC.
 353          */
 354 
 355         *protocol = RC_PROTO_UNKNOWN;
 356         *scancode = b;
 357         *toggle = 0;
 358         return 1;
 359 }
 360 
 361 /* Instantiate the I2C IR receiver device, if present */
 362 void init_bttv_i2c_ir(struct bttv *btv)
 363 {
 364         static const unsigned short addr_list[] = {
 365                 0x1a, 0x18, 0x64, 0x30, 0x71,
 366                 I2C_CLIENT_END
 367         };
 368         struct i2c_board_info info;
 369         struct i2c_client *i2c_dev;
 370 
 371         if (0 != btv->i2c_rc)
 372                 return;
 373 
 374         memset(&info, 0, sizeof(struct i2c_board_info));
 375         memset(&btv->init_data, 0, sizeof(btv->init_data));
 376         strscpy(info.type, "ir_video", I2C_NAME_SIZE);
 377 
 378         switch (btv->c.type) {
 379         case BTTV_BOARD_PV951:
 380                 btv->init_data.name = "PV951";
 381                 btv->init_data.get_key = get_key_pv951;
 382                 btv->init_data.ir_codes = RC_MAP_PV951;
 383                 info.addr = 0x4b;
 384                 break;
 385         }
 386 
 387         if (btv->init_data.name) {
 388                 info.platform_data = &btv->init_data;
 389                 i2c_dev = i2c_new_device(&btv->c.i2c_adap, &info);
 390         } else {
 391                 /*
 392                  * The external IR receiver is at i2c address 0x34 (0x35 for
 393                  * reads).  Future Hauppauge cards will have an internal
 394                  * receiver at 0x30 (0x31 for reads).  In theory, both can be
 395                  * fitted, and Hauppauge suggest an external overrides an
 396                  * internal.
 397                  * That's why we probe 0x1a (~0x34) first. CB
 398                  */
 399                 i2c_dev = i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list, NULL);
 400         }
 401         if (NULL == i2c_dev)
 402                 return;
 403 
 404 #if defined(CONFIG_MODULES) && defined(MODULE)
 405         request_module("ir-kbd-i2c");
 406 #endif
 407 }
 408 
 409 int bttv_input_init(struct bttv *btv)
 410 {
 411         struct bttv_ir *ir;
 412         char *ir_codes = NULL;
 413         struct rc_dev *rc;
 414         int err = -ENOMEM;
 415 
 416         if (!btv->has_remote)
 417                 return -ENODEV;
 418 
 419         ir = kzalloc(sizeof(*ir),GFP_KERNEL);
 420         rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 421         if (!ir || !rc)
 422                 goto err_out_free;
 423 
 424         /* detect & configure */
 425         switch (btv->c.type) {
 426         case BTTV_BOARD_AVERMEDIA:
 427         case BTTV_BOARD_AVPHONE98:
 428         case BTTV_BOARD_AVERMEDIA98:
 429                 ir_codes         = RC_MAP_AVERMEDIA;
 430                 ir->mask_keycode = 0xf88000;
 431                 ir->mask_keydown = 0x010000;
 432                 ir->polling      = 50; // ms
 433                 break;
 434 
 435         case BTTV_BOARD_AVDVBT_761:
 436         case BTTV_BOARD_AVDVBT_771:
 437                 ir_codes         = RC_MAP_AVERMEDIA_DVBT;
 438                 ir->mask_keycode = 0x0f00c0;
 439                 ir->mask_keydown = 0x000020;
 440                 ir->polling      = 50; // ms
 441                 break;
 442 
 443         case BTTV_BOARD_PXELVWPLTVPAK:
 444                 ir_codes         = RC_MAP_PIXELVIEW;
 445                 ir->mask_keycode = 0x003e00;
 446                 ir->mask_keyup   = 0x010000;
 447                 ir->polling      = 50; // ms
 448                 break;
 449         case BTTV_BOARD_PV_M4900:
 450         case BTTV_BOARD_PV_BT878P_9B:
 451         case BTTV_BOARD_PV_BT878P_PLUS:
 452                 ir_codes         = RC_MAP_PIXELVIEW;
 453                 ir->mask_keycode = 0x001f00;
 454                 ir->mask_keyup   = 0x008000;
 455                 ir->polling      = 50; // ms
 456                 break;
 457 
 458         case BTTV_BOARD_WINFAST2000:
 459                 ir_codes         = RC_MAP_WINFAST;
 460                 ir->mask_keycode = 0x1f8;
 461                 break;
 462         case BTTV_BOARD_MAGICTVIEW061:
 463         case BTTV_BOARD_MAGICTVIEW063:
 464                 ir_codes         = RC_MAP_WINFAST;
 465                 ir->mask_keycode = 0x0008e000;
 466                 ir->mask_keydown = 0x00200000;
 467                 break;
 468         case BTTV_BOARD_APAC_VIEWCOMP:
 469                 ir_codes         = RC_MAP_APAC_VIEWCOMP;
 470                 ir->mask_keycode = 0x001f00;
 471                 ir->mask_keyup   = 0x008000;
 472                 ir->polling      = 50; // ms
 473                 break;
 474         case BTTV_BOARD_ASKEY_CPH03X:
 475         case BTTV_BOARD_CONCEPTRONIC_CTVFMI2:
 476         case BTTV_BOARD_CONTVFMI:
 477         case BTTV_BOARD_KWORLD_VSTREAM_XPERT:
 478                 ir_codes         = RC_MAP_PIXELVIEW;
 479                 ir->mask_keycode = 0x001F00;
 480                 ir->mask_keyup   = 0x006000;
 481                 ir->polling      = 50; // ms
 482                 break;
 483         case BTTV_BOARD_NEBULA_DIGITV:
 484                 ir_codes         = RC_MAP_NEBULA;
 485                 ir->rc5_gpio     = true;
 486                 break;
 487         case BTTV_BOARD_MACHTV_MAGICTV:
 488                 ir_codes         = RC_MAP_APAC_VIEWCOMP;
 489                 ir->mask_keycode = 0x001F00;
 490                 ir->mask_keyup   = 0x004000;
 491                 ir->polling      = 50; /* ms */
 492                 break;
 493         case BTTV_BOARD_KOZUMI_KTV_01C:
 494                 ir_codes         = RC_MAP_PCTV_SEDNA;
 495                 ir->mask_keycode = 0x001f00;
 496                 ir->mask_keyup   = 0x006000;
 497                 ir->polling      = 50; /* ms */
 498                 break;
 499         case BTTV_BOARD_ENLTV_FM_2:
 500                 ir_codes         = RC_MAP_ENCORE_ENLTV2;
 501                 ir->mask_keycode = 0x00fd00;
 502                 ir->mask_keyup   = 0x000080;
 503                 ir->polling      = 1; /* ms */
 504                 ir->last_gpio    = ir_extract_bits(bttv_gpio_read(&btv->c),
 505                                                    ir->mask_keycode);
 506                 break;
 507         }
 508 
 509         if (!ir_codes) {
 510                 dprintk("Ooops: IR config error [card=%d]\n", btv->c.type);
 511                 err = -ENODEV;
 512                 goto err_out_free;
 513         }
 514 
 515         if (ir->rc5_gpio) {
 516                 u32 gpio;
 517                 /* enable remote irq */
 518                 bttv_gpio_inout(&btv->c, (1 << 4), 1 << 4);
 519                 gpio = bttv_gpio_read(&btv->c);
 520                 bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
 521                 bttv_gpio_write(&btv->c, gpio | (1 << 4));
 522         } else {
 523                 /* init hardware-specific stuff */
 524                 bttv_gpio_inout(&btv->c, ir->mask_keycode | ir->mask_keydown, 0);
 525         }
 526 
 527         /* init input device */
 528         ir->dev = rc;
 529         ir->btv = btv;
 530 
 531         snprintf(ir->name, sizeof(ir->name), "bttv IR (card=%d)",
 532                  btv->c.type);
 533         snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0",
 534                  pci_name(btv->c.pci));
 535 
 536         rc->device_name = ir->name;
 537         rc->input_phys = ir->phys;
 538         rc->input_id.bustype = BUS_PCI;
 539         rc->input_id.version = 1;
 540         if (btv->c.pci->subsystem_vendor) {
 541                 rc->input_id.vendor  = btv->c.pci->subsystem_vendor;
 542                 rc->input_id.product = btv->c.pci->subsystem_device;
 543         } else {
 544                 rc->input_id.vendor  = btv->c.pci->vendor;
 545                 rc->input_id.product = btv->c.pci->device;
 546         }
 547         rc->dev.parent = &btv->c.pci->dev;
 548         rc->map_name = ir_codes;
 549         rc->driver_name = MODULE_NAME;
 550 
 551         btv->remote = ir;
 552         bttv_ir_start(ir);
 553 
 554         /* all done */
 555         err = rc_register_device(rc);
 556         if (err)
 557                 goto err_out_stop;
 558 
 559         return 0;
 560 
 561  err_out_stop:
 562         bttv_ir_stop(btv);
 563         btv->remote = NULL;
 564  err_out_free:
 565         rc_free_device(rc);
 566         kfree(ir);
 567         return err;
 568 }
 569 
 570 void bttv_input_fini(struct bttv *btv)
 571 {
 572         if (btv->remote == NULL)
 573                 return;
 574 
 575         bttv_ir_stop(btv);
 576         rc_unregister_device(btv->remote->dev);
 577         kfree(btv->remote);
 578         btv->remote = NULL;
 579 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/pci/bt8xx/bttv-input.c

DEFINITIONS
