1/* 2 * Empiatech em28x1 audio extension 3 * 4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 5 * 6 * Copyright (C) 2007-2014 Mauro Carvalho Chehab 7 * - Port to work with the in-kernel driver 8 * - Cleanups, fixes, alsa-controls, etc. 9 * 10 * This driver is based on my previous au600 usb pstn audio driver 11 * and inherits all the copyrights 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28#include <linux/kernel.h> 29#include <linux/usb.h> 30#include <linux/init.h> 31#include <linux/sound.h> 32#include <linux/spinlock.h> 33#include <linux/soundcard.h> 34#include <linux/slab.h> 35#include <linux/vmalloc.h> 36#include <linux/proc_fs.h> 37#include <linux/module.h> 38#include <sound/core.h> 39#include <sound/pcm.h> 40#include <sound/pcm_params.h> 41#include <sound/info.h> 42#include <sound/initval.h> 43#include <sound/control.h> 44#include <sound/tlv.h> 45#include <sound/ac97_codec.h> 46#include <media/v4l2-common.h> 47#include "em28xx.h" 48 49static int debug; 50module_param(debug, int, 0644); 51MODULE_PARM_DESC(debug, "activates debug info"); 52 53#define EM28XX_MAX_AUDIO_BUFS 5 54#define EM28XX_MIN_AUDIO_PACKETS 64 55 56#define dprintk(fmt, arg...) do { \ 57 if (debug) \ 58 printk(KERN_INFO "em28xx-audio %s: " fmt, \ 59 __func__, ##arg); \ 60 } while (0) 61 62static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 63 64static int em28xx_deinit_isoc_audio(struct em28xx *dev) 65{ 66 int i; 67 68 dprintk("Stopping isoc\n"); 69 for (i = 0; i < dev->adev.num_urb; i++) { 70 struct urb *urb = dev->adev.urb[i]; 71 72 if (!irqs_disabled()) 73 usb_kill_urb(urb); 74 else 75 usb_unlink_urb(urb); 76 } 77 78 return 0; 79} 80 81static void em28xx_audio_isocirq(struct urb *urb) 82{ 83 struct em28xx *dev = urb->context; 84 int i; 85 unsigned int oldptr; 86 int period_elapsed = 0; 87 int status; 88 unsigned char *cp; 89 unsigned int stride; 90 struct snd_pcm_substream *substream; 91 struct snd_pcm_runtime *runtime; 92 93 if (dev->disconnected) { 94 dprintk("device disconnected while streaming. URB status=%d.\n", urb->status); 95 atomic_set(&dev->adev.stream_started, 0); 96 return; 97 } 98 99 switch (urb->status) { 100 case 0: /* success */ 101 case -ETIMEDOUT: /* NAK */ 102 break; 103 case -ECONNRESET: /* kill */ 104 case -ENOENT: 105 case -ESHUTDOWN: 106 return; 107 default: /* error */ 108 dprintk("urb completition error %d.\n", urb->status); 109 break; 110 } 111 112 if (atomic_read(&dev->adev.stream_started) == 0) 113 return; 114 115 if (dev->adev.capture_pcm_substream) { 116 substream = dev->adev.capture_pcm_substream; 117 runtime = substream->runtime; 118 stride = runtime->frame_bits >> 3; 119 120 for (i = 0; i < urb->number_of_packets; i++) { 121 int length = 122 urb->iso_frame_desc[i].actual_length / stride; 123 cp = (unsigned char *)urb->transfer_buffer + 124 urb->iso_frame_desc[i].offset; 125 126 if (!length) 127 continue; 128 129 oldptr = dev->adev.hwptr_done_capture; 130 if (oldptr + length >= runtime->buffer_size) { 131 unsigned int cnt = 132 runtime->buffer_size - oldptr; 133 memcpy(runtime->dma_area + oldptr * stride, cp, 134 cnt * stride); 135 memcpy(runtime->dma_area, cp + cnt * stride, 136 length * stride - cnt * stride); 137 } else { 138 memcpy(runtime->dma_area + oldptr * stride, cp, 139 length * stride); 140 } 141 142 snd_pcm_stream_lock(substream); 143 144 dev->adev.hwptr_done_capture += length; 145 if (dev->adev.hwptr_done_capture >= 146 runtime->buffer_size) 147 dev->adev.hwptr_done_capture -= 148 runtime->buffer_size; 149 150 dev->adev.capture_transfer_done += length; 151 if (dev->adev.capture_transfer_done >= 152 runtime->period_size) { 153 dev->adev.capture_transfer_done -= 154 runtime->period_size; 155 period_elapsed = 1; 156 } 157 158 snd_pcm_stream_unlock(substream); 159 } 160 if (period_elapsed) 161 snd_pcm_period_elapsed(substream); 162 } 163 urb->status = 0; 164 165 status = usb_submit_urb(urb, GFP_ATOMIC); 166 if (status < 0) 167 em28xx_errdev("resubmit of audio urb failed (error=%i)\n", 168 status); 169 return; 170} 171 172static int em28xx_init_audio_isoc(struct em28xx *dev) 173{ 174 int i, errCode; 175 176 dprintk("Starting isoc transfers\n"); 177 178 /* Start streaming */ 179 for (i = 0; i < dev->adev.num_urb; i++) { 180 memset(dev->adev.transfer_buffer[i], 0x80, 181 dev->adev.urb[i]->transfer_buffer_length); 182 183 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 184 if (errCode) { 185 em28xx_errdev("submit of audio urb failed (error=%i)\n", 186 errCode); 187 em28xx_deinit_isoc_audio(dev); 188 atomic_set(&dev->adev.stream_started, 0); 189 return errCode; 190 } 191 192 } 193 194 return 0; 195} 196 197static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 198 size_t size) 199{ 200 struct snd_pcm_runtime *runtime = subs->runtime; 201 202 dprintk("Allocating vbuffer\n"); 203 if (runtime->dma_area) { 204 if (runtime->dma_bytes > size) 205 return 0; 206 207 vfree(runtime->dma_area); 208 } 209 runtime->dma_area = vmalloc(size); 210 if (!runtime->dma_area) 211 return -ENOMEM; 212 213 runtime->dma_bytes = size; 214 215 return 0; 216} 217 218static struct snd_pcm_hardware snd_em28xx_hw_capture = { 219 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 220 SNDRV_PCM_INFO_MMAP | 221 SNDRV_PCM_INFO_INTERLEAVED | 222 SNDRV_PCM_INFO_BATCH | 223 SNDRV_PCM_INFO_MMAP_VALID, 224 225 .formats = SNDRV_PCM_FMTBIT_S16_LE, 226 227 .rates = SNDRV_PCM_RATE_48000, 228 229 .rate_min = 48000, 230 .rate_max = 48000, 231 .channels_min = 2, 232 .channels_max = 2, 233 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 234 235 /* 236 * The period is 12.288 bytes. Allow a 10% of variation along its 237 * value, in order to avoid overruns/underruns due to some clock 238 * drift. 239 * 240 * FIXME: This period assumes 64 packets, and a 48000 PCM rate. 241 * Calculate it dynamically. 242 */ 243 .period_bytes_min = 11059, 244 .period_bytes_max = 13516, 245 246 .periods_min = 2, 247 .periods_max = 98, /* 12544, */ 248}; 249 250static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) 251{ 252 struct em28xx *dev = snd_pcm_substream_chip(substream); 253 struct snd_pcm_runtime *runtime = substream->runtime; 254 int nonblock, ret = 0; 255 256 if (!dev) { 257 em28xx_err("BUG: em28xx can't find device struct." 258 " Can't proceed with open\n"); 259 return -ENODEV; 260 } 261 262 if (dev->disconnected) 263 return -ENODEV; 264 265 dprintk("opening device and trying to acquire exclusive lock\n"); 266 267 nonblock = !!(substream->f_flags & O_NONBLOCK); 268 if (nonblock) { 269 if (!mutex_trylock(&dev->lock)) 270 return -EAGAIN; 271 } else 272 mutex_lock(&dev->lock); 273 274 runtime->hw = snd_em28xx_hw_capture; 275 276 if (dev->adev.users == 0) { 277 if (dev->alt == 0 || dev->is_audio_only) { 278 if (dev->is_audio_only) 279 /* audio is on a separate interface */ 280 dev->alt = 1; 281 else 282 /* audio is on the same interface as video */ 283 dev->alt = 7; 284 /* 285 * FIXME: The intention seems to be to select 286 * the alt setting with the largest 287 * wMaxPacketSize for the video endpoint. 288 * At least dev->alt should be used instead, but 289 * we should probably not touch it at all if it 290 * is already >0, because wMaxPacketSize of the 291 * audio endpoints seems to be the same for all. 292 */ 293 dprintk("changing alternate number on interface %d to %d\n", 294 dev->ifnum, dev->alt); 295 usb_set_interface(dev->udev, dev->ifnum, dev->alt); 296 } 297 298 /* Sets volume, mute, etc */ 299 dev->mute = 0; 300 ret = em28xx_audio_analog_set(dev); 301 if (ret < 0) 302 goto err; 303 } 304 305 kref_get(&dev->ref); 306 dev->adev.users++; 307 mutex_unlock(&dev->lock); 308 309 /* Dynamically adjust the period size */ 310 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 311 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 312 dev->adev.period * 95 / 100, 313 dev->adev.period * 105 / 100); 314 315 dev->adev.capture_pcm_substream = substream; 316 317 return 0; 318err: 319 mutex_unlock(&dev->lock); 320 321 em28xx_err("Error while configuring em28xx mixer\n"); 322 return ret; 323} 324 325static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 326{ 327 struct em28xx *dev = snd_pcm_substream_chip(substream); 328 329 dprintk("closing device\n"); 330 331 dev->mute = 1; 332 mutex_lock(&dev->lock); 333 dev->adev.users--; 334 if (atomic_read(&dev->adev.stream_started) > 0) { 335 atomic_set(&dev->adev.stream_started, 0); 336 schedule_work(&dev->adev.wq_trigger); 337 } 338 339 em28xx_audio_analog_set(dev); 340 if (substream->runtime->dma_area) { 341 dprintk("freeing\n"); 342 vfree(substream->runtime->dma_area); 343 substream->runtime->dma_area = NULL; 344 } 345 mutex_unlock(&dev->lock); 346 kref_put(&dev->ref, em28xx_free_device); 347 348 return 0; 349} 350 351static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 352 struct snd_pcm_hw_params *hw_params) 353{ 354 int ret; 355 struct em28xx *dev = snd_pcm_substream_chip(substream); 356 357 if (dev->disconnected) 358 return -ENODEV; 359 360 dprintk("Setting capture parameters\n"); 361 362 ret = snd_pcm_alloc_vmalloc_buffer(substream, 363 params_buffer_bytes(hw_params)); 364 if (ret < 0) 365 return ret; 366#if 0 367 /* TODO: set up em28xx audio chip to deliver the correct audio format, 368 current default is 48000hz multiplexed => 96000hz mono 369 which shouldn't matter since analogue TV only supports mono */ 370 unsigned int channels, rate, format; 371 372 format = params_format(hw_params); 373 rate = params_rate(hw_params); 374 channels = params_channels(hw_params); 375#endif 376 377 return 0; 378} 379 380static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 381{ 382 struct em28xx *dev = snd_pcm_substream_chip(substream); 383 struct em28xx_audio *adev = &dev->adev; 384 385 dprintk("Stop capture, if needed\n"); 386 387 if (atomic_read(&adev->stream_started) > 0) { 388 atomic_set(&adev->stream_started, 0); 389 schedule_work(&adev->wq_trigger); 390 } 391 392 return 0; 393} 394 395static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 396{ 397 struct em28xx *dev = snd_pcm_substream_chip(substream); 398 399 if (dev->disconnected) 400 return -ENODEV; 401 402 dev->adev.hwptr_done_capture = 0; 403 dev->adev.capture_transfer_done = 0; 404 405 return 0; 406} 407 408static void audio_trigger(struct work_struct *work) 409{ 410 struct em28xx_audio *adev = 411 container_of(work, struct em28xx_audio, wq_trigger); 412 struct em28xx *dev = container_of(adev, struct em28xx, adev); 413 414 if (atomic_read(&adev->stream_started)) { 415 dprintk("starting capture"); 416 em28xx_init_audio_isoc(dev); 417 } else { 418 dprintk("stopping capture"); 419 em28xx_deinit_isoc_audio(dev); 420 } 421} 422 423static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 424 int cmd) 425{ 426 struct em28xx *dev = snd_pcm_substream_chip(substream); 427 int retval = 0; 428 429 if (dev->disconnected) 430 return -ENODEV; 431 432 switch (cmd) { 433 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 434 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 435 case SNDRV_PCM_TRIGGER_START: 436 atomic_set(&dev->adev.stream_started, 1); 437 break; 438 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 439 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 440 case SNDRV_PCM_TRIGGER_STOP: 441 atomic_set(&dev->adev.stream_started, 0); 442 break; 443 default: 444 retval = -EINVAL; 445 } 446 schedule_work(&dev->adev.wq_trigger); 447 return retval; 448} 449 450static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 451 *substream) 452{ 453 unsigned long flags; 454 struct em28xx *dev; 455 snd_pcm_uframes_t hwptr_done; 456 457 dev = snd_pcm_substream_chip(substream); 458 if (dev->disconnected) 459 return SNDRV_PCM_POS_XRUN; 460 461 spin_lock_irqsave(&dev->adev.slock, flags); 462 hwptr_done = dev->adev.hwptr_done_capture; 463 spin_unlock_irqrestore(&dev->adev.slock, flags); 464 465 return hwptr_done; 466} 467 468static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 469 unsigned long offset) 470{ 471 void *pageptr = subs->runtime->dma_area + offset; 472 473 return vmalloc_to_page(pageptr); 474} 475 476/* 477 * AC97 volume control support 478 */ 479static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 480 struct snd_ctl_elem_info *info) 481{ 482 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 483 484 if (dev->disconnected) 485 return -ENODEV; 486 487 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 488 info->count = 2; 489 info->value.integer.min = 0; 490 info->value.integer.max = 0x1f; 491 492 return 0; 493} 494 495static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 496 struct snd_ctl_elem_value *value) 497{ 498 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 499 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 500 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 501 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 502 int nonblock = 0; 503 int rc; 504 505 if (dev->disconnected) 506 return -ENODEV; 507 508 if (substream) 509 nonblock = !!(substream->f_flags & O_NONBLOCK); 510 if (nonblock) { 511 if (!mutex_trylock(&dev->lock)) 512 return -EAGAIN; 513 } else 514 mutex_lock(&dev->lock); 515 rc = em28xx_read_ac97(dev, kcontrol->private_value); 516 if (rc < 0) 517 goto err; 518 519 val |= rc & 0x8000; /* Preserve the mute flag */ 520 521 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 522 if (rc < 0) 523 goto err; 524 525 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 526 (val & 0x8000) ? "muted " : "", 527 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 528 val, (int)kcontrol->private_value); 529 530err: 531 mutex_unlock(&dev->lock); 532 return rc; 533} 534 535static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 536 struct snd_ctl_elem_value *value) 537{ 538 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 539 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 540 int nonblock = 0; 541 int val; 542 543 if (dev->disconnected) 544 return -ENODEV; 545 546 if (substream) 547 nonblock = !!(substream->f_flags & O_NONBLOCK); 548 if (nonblock) { 549 if (!mutex_trylock(&dev->lock)) 550 return -EAGAIN; 551 } else 552 mutex_lock(&dev->lock); 553 val = em28xx_read_ac97(dev, kcontrol->private_value); 554 mutex_unlock(&dev->lock); 555 if (val < 0) 556 return val; 557 558 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 559 (val & 0x8000) ? "muted " : "", 560 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 561 val, (int)kcontrol->private_value); 562 563 value->value.integer.value[0] = 0x1f - (val & 0x1f); 564 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); 565 566 return 0; 567} 568 569static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 570 struct snd_ctl_elem_value *value) 571{ 572 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 573 u16 val = value->value.integer.value[0]; 574 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 575 int nonblock = 0; 576 int rc; 577 578 if (dev->disconnected) 579 return -ENODEV; 580 581 if (substream) 582 nonblock = !!(substream->f_flags & O_NONBLOCK); 583 if (nonblock) { 584 if (!mutex_trylock(&dev->lock)) 585 return -EAGAIN; 586 } else 587 mutex_lock(&dev->lock); 588 rc = em28xx_read_ac97(dev, kcontrol->private_value); 589 if (rc < 0) 590 goto err; 591 592 if (val) 593 rc &= 0x1f1f; 594 else 595 rc |= 0x8000; 596 597 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 598 if (rc < 0) 599 goto err; 600 601 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 602 (val & 0x8000) ? "muted " : "", 603 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 604 val, (int)kcontrol->private_value); 605 606err: 607 mutex_unlock(&dev->lock); 608 return rc; 609} 610 611static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 612 struct snd_ctl_elem_value *value) 613{ 614 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 615 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 616 int nonblock = 0; 617 int val; 618 619 if (dev->disconnected) 620 return -ENODEV; 621 622 if (substream) 623 nonblock = !!(substream->f_flags & O_NONBLOCK); 624 if (nonblock) { 625 if (!mutex_trylock(&dev->lock)) 626 return -EAGAIN; 627 } else 628 mutex_lock(&dev->lock); 629 val = em28xx_read_ac97(dev, kcontrol->private_value); 630 mutex_unlock(&dev->lock); 631 if (val < 0) 632 return val; 633 634 if (val & 0x8000) 635 value->value.integer.value[0] = 0; 636 else 637 value->value.integer.value[0] = 1; 638 639 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 640 (val & 0x8000) ? "muted " : "", 641 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 642 val, (int)kcontrol->private_value); 643 644 return 0; 645} 646 647static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 648 649static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 650 char *name, int id) 651{ 652 int err; 653 char ctl_name[44]; 654 struct snd_kcontrol *kctl; 655 struct snd_kcontrol_new tmp; 656 657 memset(&tmp, 0, sizeof(tmp)); 658 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 659 tmp.private_value = id, 660 tmp.name = ctl_name, 661 662 /* Add Mute Control */ 663 sprintf(ctl_name, "%s Switch", name); 664 tmp.get = em28xx_vol_get_mute; 665 tmp.put = em28xx_vol_put_mute; 666 tmp.info = snd_ctl_boolean_mono_info; 667 kctl = snd_ctl_new1(&tmp, dev); 668 err = snd_ctl_add(card, kctl); 669 if (err < 0) 670 return err; 671 dprintk("Added control %s for ac97 volume control 0x%04x\n", 672 ctl_name, id); 673 674 memset(&tmp, 0, sizeof(tmp)); 675 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 676 tmp.private_value = id, 677 tmp.name = ctl_name, 678 679 /* Add Volume Control */ 680 sprintf(ctl_name, "%s Volume", name); 681 tmp.get = em28xx_vol_get; 682 tmp.put = em28xx_vol_put; 683 tmp.info = em28xx_vol_info; 684 tmp.tlv.p = em28xx_db_scale, 685 kctl = snd_ctl_new1(&tmp, dev); 686 err = snd_ctl_add(card, kctl); 687 if (err < 0) 688 return err; 689 dprintk("Added control %s for ac97 volume control 0x%04x\n", 690 ctl_name, id); 691 692 return 0; 693} 694 695/* 696 * register/unregister code and data 697 */ 698static struct snd_pcm_ops snd_em28xx_pcm_capture = { 699 .open = snd_em28xx_capture_open, 700 .close = snd_em28xx_pcm_close, 701 .ioctl = snd_pcm_lib_ioctl, 702 .hw_params = snd_em28xx_hw_capture_params, 703 .hw_free = snd_em28xx_hw_capture_free, 704 .prepare = snd_em28xx_prepare, 705 .trigger = snd_em28xx_capture_trigger, 706 .pointer = snd_em28xx_capture_pointer, 707 .page = snd_pcm_get_vmalloc_page, 708}; 709 710static void em28xx_audio_free_urb(struct em28xx *dev) 711{ 712 int i; 713 714 for (i = 0; i < dev->adev.num_urb; i++) { 715 struct urb *urb = dev->adev.urb[i]; 716 717 if (!urb) 718 continue; 719 720 usb_free_coherent(dev->udev, urb->transfer_buffer_length, 721 dev->adev.transfer_buffer[i], 722 urb->transfer_dma); 723 724 usb_free_urb(urb); 725 } 726 kfree(dev->adev.urb); 727 kfree(dev->adev.transfer_buffer); 728 dev->adev.num_urb = 0; 729} 730 731/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ 732static int em28xx_audio_ep_packet_size(struct usb_device *udev, 733 struct usb_endpoint_descriptor *e) 734{ 735 int size = le16_to_cpu(e->wMaxPacketSize); 736 737 if (udev->speed == USB_SPEED_HIGH) 738 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); 739 740 return size & 0x7ff; 741} 742 743static int em28xx_audio_urb_init(struct em28xx *dev) 744{ 745 struct usb_interface *intf; 746 struct usb_endpoint_descriptor *e, *ep = NULL; 747 int i, ep_size, interval, num_urb, npackets; 748 int urb_size, bytes_per_transfer; 749 u8 alt; 750 751 if (dev->ifnum) 752 alt = 1; 753 else 754 alt = 7; 755 756 intf = usb_ifnum_to_if(dev->udev, dev->ifnum); 757 758 if (intf->num_altsetting <= alt) { 759 em28xx_errdev("alt %d doesn't exist on interface %d\n", 760 dev->ifnum, alt); 761 return -ENODEV; 762 } 763 764 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { 765 e = &intf->altsetting[alt].endpoint[i].desc; 766 if (!usb_endpoint_dir_in(e)) 767 continue; 768 if (e->bEndpointAddress == EM28XX_EP_AUDIO) { 769 ep = e; 770 break; 771 } 772 } 773 774 if (!ep) { 775 em28xx_errdev("Couldn't find an audio endpoint"); 776 return -ENODEV; 777 } 778 779 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep); 780 interval = 1 << (ep->bInterval - 1); 781 782 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", 783 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed), 784 dev->ifnum, alt, 785 interval, 786 ep_size); 787 788 /* Calculate the number and size of URBs to better fit the audio samples */ 789 790 /* 791 * Estimate the number of bytes per DMA transfer. 792 * 793 * This is given by the bit rate (for now, only 48000 Hz) multiplied 794 * by 2 channels and 2 bytes/sample divided by the number of microframe 795 * intervals and by the microframe rate (125 us) 796 */ 797 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); 798 799 /* 800 * Estimate the number of transfer URBs. Don't let it go past the 801 * maximum number of URBs that is known to be supported by the device. 802 */ 803 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); 804 if (num_urb > EM28XX_MAX_AUDIO_BUFS) 805 num_urb = EM28XX_MAX_AUDIO_BUFS; 806 807 /* 808 * Now that we know the number of bytes per transfer and the number of 809 * URBs, estimate the typical size of an URB, in order to adjust the 810 * minimal number of packets. 811 */ 812 urb_size = bytes_per_transfer / num_urb; 813 814 /* 815 * Now, calculate the amount of audio packets to be filled on each 816 * URB. In order to preserve the old behaviour, use a minimal 817 * threshold for this value. 818 */ 819 npackets = EM28XX_MIN_AUDIO_PACKETS; 820 if (urb_size > ep_size * npackets) 821 npackets = DIV_ROUND_UP(urb_size, ep_size); 822 823 em28xx_info("Number of URBs: %d, with %d packets and %d size\n", 824 num_urb, npackets, urb_size); 825 826 /* Estimate the bytes per period */ 827 dev->adev.period = urb_size * npackets; 828 829 /* Allocate space to store the number of URBs to be used */ 830 831 dev->adev.transfer_buffer = kcalloc(num_urb, 832 sizeof(*dev->adev.transfer_buffer), 833 GFP_ATOMIC); 834 if (!dev->adev.transfer_buffer) { 835 return -ENOMEM; 836 } 837 838 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC); 839 if (!dev->adev.urb) { 840 kfree(dev->adev.transfer_buffer); 841 return -ENOMEM; 842 } 843 844 /* Alloc memory for each URB and for each transfer buffer */ 845 dev->adev.num_urb = num_urb; 846 for (i = 0; i < num_urb; i++) { 847 struct urb *urb; 848 int j, k; 849 void *buf; 850 851 urb = usb_alloc_urb(npackets, GFP_ATOMIC); 852 if (!urb) { 853 em28xx_errdev("usb_alloc_urb failed!\n"); 854 em28xx_audio_free_urb(dev); 855 return -ENOMEM; 856 } 857 dev->adev.urb[i] = urb; 858 859 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC, 860 &urb->transfer_dma); 861 if (!buf) { 862 em28xx_errdev("usb_alloc_coherent failed!\n"); 863 em28xx_audio_free_urb(dev); 864 return -ENOMEM; 865 } 866 dev->adev.transfer_buffer[i] = buf; 867 868 urb->dev = dev->udev; 869 urb->context = dev; 870 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO); 871 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 872 urb->transfer_buffer = buf; 873 urb->interval = interval; 874 urb->complete = em28xx_audio_isocirq; 875 urb->number_of_packets = npackets; 876 urb->transfer_buffer_length = ep_size * npackets; 877 878 for (j = k = 0; j < npackets; j++, k += ep_size) { 879 urb->iso_frame_desc[j].offset = k; 880 urb->iso_frame_desc[j].length = ep_size; 881 } 882 } 883 884 return 0; 885} 886 887static int em28xx_audio_init(struct em28xx *dev) 888{ 889 struct em28xx_audio *adev = &dev->adev; 890 struct snd_pcm *pcm; 891 struct snd_card *card; 892 static int devnr; 893 int err; 894 895 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 896 /* This device does not support the extension (in this case 897 the device is expecting the snd-usb-audio module or 898 doesn't have analog audio support at all) */ 899 return 0; 900 } 901 902 em28xx_info("Binding audio extension\n"); 903 904 kref_get(&dev->ref); 905 906 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " 907 "Rechberger\n"); 908 printk(KERN_INFO 909 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n"); 910 911 err = snd_card_new(&dev->udev->dev, index[devnr], "Em28xx Audio", 912 THIS_MODULE, 0, &card); 913 if (err < 0) 914 return err; 915 916 spin_lock_init(&adev->slock); 917 adev->sndcard = card; 918 adev->udev = dev->udev; 919 920 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 921 if (err < 0) 922 goto card_free; 923 924 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 925 pcm->info_flags = 0; 926 pcm->private_data = dev; 927 strcpy(pcm->name, "Empia 28xx Capture"); 928 929 strcpy(card->driver, "Em28xx-Audio"); 930 strcpy(card->shortname, "Em28xx Audio"); 931 strcpy(card->longname, "Empia Em28xx Audio"); 932 933 INIT_WORK(&adev->wq_trigger, audio_trigger); 934 935 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 936 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); 937 em28xx_cvol_new(card, dev, "Line In", AC97_LINE); 938 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); 939 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); 940 em28xx_cvol_new(card, dev, "CD", AC97_CD); 941 em28xx_cvol_new(card, dev, "AUX", AC97_AUX); 942 em28xx_cvol_new(card, dev, "PCM", AC97_PCM); 943 944 em28xx_cvol_new(card, dev, "Master", AC97_MASTER); 945 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); 946 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); 947 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); 948 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); 949 } 950 951 err = em28xx_audio_urb_init(dev); 952 if (err) 953 goto card_free; 954 955 err = snd_card_register(card); 956 if (err < 0) 957 goto urb_free; 958 959 em28xx_info("Audio extension successfully initialized\n"); 960 return 0; 961 962urb_free: 963 em28xx_audio_free_urb(dev); 964 965card_free: 966 snd_card_free(card); 967 adev->sndcard = NULL; 968 969 return err; 970} 971 972static int em28xx_audio_fini(struct em28xx *dev) 973{ 974 if (dev == NULL) 975 return 0; 976 977 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 978 /* This device does not support the extension (in this case 979 the device is expecting the snd-usb-audio module or 980 doesn't have analog audio support at all) */ 981 return 0; 982 } 983 984 em28xx_info("Closing audio extension\n"); 985 986 if (dev->adev.sndcard) { 987 snd_card_disconnect(dev->adev.sndcard); 988 flush_work(&dev->adev.wq_trigger); 989 990 em28xx_audio_free_urb(dev); 991 992 snd_card_free(dev->adev.sndcard); 993 dev->adev.sndcard = NULL; 994 } 995 996 kref_put(&dev->ref, em28xx_free_device); 997 return 0; 998} 999 1000static int em28xx_audio_suspend(struct em28xx *dev) 1001{ 1002 if (dev == NULL) 1003 return 0; 1004 1005 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1006 return 0; 1007 1008 em28xx_info("Suspending audio extension\n"); 1009 em28xx_deinit_isoc_audio(dev); 1010 atomic_set(&dev->adev.stream_started, 0); 1011 return 0; 1012} 1013 1014static int em28xx_audio_resume(struct em28xx *dev) 1015{ 1016 if (dev == NULL) 1017 return 0; 1018 1019 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1020 return 0; 1021 1022 em28xx_info("Resuming audio extension\n"); 1023 /* Nothing to do other than schedule_work() ?? */ 1024 schedule_work(&dev->adev.wq_trigger); 1025 return 0; 1026} 1027 1028static struct em28xx_ops audio_ops = { 1029 .id = EM28XX_AUDIO, 1030 .name = "Em28xx Audio Extension", 1031 .init = em28xx_audio_init, 1032 .fini = em28xx_audio_fini, 1033 .suspend = em28xx_audio_suspend, 1034 .resume = em28xx_audio_resume, 1035}; 1036 1037static int __init em28xx_alsa_register(void) 1038{ 1039 return em28xx_register_extension(&audio_ops); 1040} 1041 1042static void __exit em28xx_alsa_unregister(void) 1043{ 1044 em28xx_unregister_extension(&audio_ops); 1045} 1046 1047MODULE_LICENSE("GPL"); 1048MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 1049MODULE_AUTHOR("Mauro Carvalho Chehab"); 1050MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); 1051MODULE_VERSION(EM28XX_VERSION); 1052 1053module_init(em28xx_alsa_register); 1054module_exit(em28xx_alsa_unregister); 1055