1/* 2 * Empiatech em28x1 audio extension 3 * 4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 5 * 6 * Copyright (C) 2007-2011 Mauro Carvalho Chehab <mchehab@redhat.com> 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 <media/v4l2-common.h> 46#include "em28xx.h" 47 48static int debug; 49module_param(debug, int, 0644); 50MODULE_PARM_DESC(debug, "activates debug info"); 51 52#define dprintk(fmt, arg...) do { \ 53 if (debug) \ 54 printk(KERN_INFO "em28xx-audio %s: " fmt, \ 55 __func__, ##arg); \ 56 } while (0) 57 58static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 59 60static int em28xx_deinit_isoc_audio(struct em28xx *dev) 61{ 62 int i; 63 64 dprintk("Stopping isoc\n"); 65 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 66 if (!irqs_disabled()) 67 usb_kill_urb(dev->adev.urb[i]); 68 else 69 usb_unlink_urb(dev->adev.urb[i]); 70 71 usb_free_urb(dev->adev.urb[i]); 72 dev->adev.urb[i] = NULL; 73 74 kfree(dev->adev.transfer_buffer[i]); 75 dev->adev.transfer_buffer[i] = NULL; 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 switch (urb->status) { 94 case 0: /* success */ 95 case -ETIMEDOUT: /* NAK */ 96 break; 97 case -ECONNRESET: /* kill */ 98 case -ENOENT: 99 case -ESHUTDOWN: 100 return; 101 default: /* error */ 102 dprintk("urb completition error %d.\n", urb->status); 103 break; 104 } 105 106 if (atomic_read(&dev->stream_started) == 0) 107 return; 108 109 if (dev->adev.capture_pcm_substream) { 110 substream = dev->adev.capture_pcm_substream; 111 runtime = substream->runtime; 112 stride = runtime->frame_bits >> 3; 113 114 for (i = 0; i < urb->number_of_packets; i++) { 115 int length = 116 urb->iso_frame_desc[i].actual_length / stride; 117 cp = (unsigned char *)urb->transfer_buffer + 118 urb->iso_frame_desc[i].offset; 119 120 if (!length) 121 continue; 122 123 oldptr = dev->adev.hwptr_done_capture; 124 if (oldptr + length >= runtime->buffer_size) { 125 unsigned int cnt = 126 runtime->buffer_size - oldptr; 127 memcpy(runtime->dma_area + oldptr * stride, cp, 128 cnt * stride); 129 memcpy(runtime->dma_area, cp + cnt * stride, 130 length * stride - cnt * stride); 131 } else { 132 memcpy(runtime->dma_area + oldptr * stride, cp, 133 length * stride); 134 } 135 136 snd_pcm_stream_lock(substream); 137 138 dev->adev.hwptr_done_capture += length; 139 if (dev->adev.hwptr_done_capture >= 140 runtime->buffer_size) 141 dev->adev.hwptr_done_capture -= 142 runtime->buffer_size; 143 144 dev->adev.capture_transfer_done += length; 145 if (dev->adev.capture_transfer_done >= 146 runtime->period_size) { 147 dev->adev.capture_transfer_done -= 148 runtime->period_size; 149 period_elapsed = 1; 150 } 151 152 snd_pcm_stream_unlock(substream); 153 } 154 if (period_elapsed) 155 snd_pcm_period_elapsed(substream); 156 } 157 urb->status = 0; 158 159 status = usb_submit_urb(urb, GFP_ATOMIC); 160 if (status < 0) { 161 em28xx_errdev("resubmit of audio urb failed (error=%i)\n", 162 status); 163 } 164 return; 165} 166 167static int em28xx_init_audio_isoc(struct em28xx *dev) 168{ 169 int i, errCode; 170 const int sb_size = EM28XX_NUM_AUDIO_PACKETS * 171 EM28XX_AUDIO_MAX_PACKET_SIZE; 172 173 dprintk("Starting isoc transfers\n"); 174 175 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 176 struct urb *urb; 177 int j, k; 178 179 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 180 if (!dev->adev.transfer_buffer[i]) 181 return -ENOMEM; 182 183 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 184 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 185 if (!urb) { 186 em28xx_errdev("usb_alloc_urb failed!\n"); 187 for (j = 0; j < i; j++) { 188 usb_free_urb(dev->adev.urb[j]); 189 kfree(dev->adev.transfer_buffer[j]); 190 } 191 return -ENOMEM; 192 } 193 194 urb->dev = dev->udev; 195 urb->context = dev; 196 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO); 197 urb->transfer_flags = URB_ISO_ASAP; 198 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 199 urb->interval = 1; 200 urb->complete = em28xx_audio_isocirq; 201 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS; 202 urb->transfer_buffer_length = sb_size; 203 204 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS; 205 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) { 206 urb->iso_frame_desc[j].offset = k; 207 urb->iso_frame_desc[j].length = 208 EM28XX_AUDIO_MAX_PACKET_SIZE; 209 } 210 dev->adev.urb[i] = urb; 211 } 212 213 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { 214 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 215 if (errCode) { 216 em28xx_errdev("submit of audio urb failed\n"); 217 em28xx_deinit_isoc_audio(dev); 218 atomic_set(&dev->stream_started, 0); 219 return errCode; 220 } 221 222 } 223 224 return 0; 225} 226 227static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 228 size_t size) 229{ 230 struct snd_pcm_runtime *runtime = subs->runtime; 231 232 dprintk("Allocating vbuffer\n"); 233 if (runtime->dma_area) { 234 if (runtime->dma_bytes > size) 235 return 0; 236 237 vfree(runtime->dma_area); 238 } 239 runtime->dma_area = vmalloc(size); 240 if (!runtime->dma_area) 241 return -ENOMEM; 242 243 runtime->dma_bytes = size; 244 245 return 0; 246} 247 248static struct snd_pcm_hardware snd_em28xx_hw_capture = { 249 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 250 SNDRV_PCM_INFO_MMAP | 251 SNDRV_PCM_INFO_INTERLEAVED | 252 SNDRV_PCM_INFO_BATCH | 253 SNDRV_PCM_INFO_MMAP_VALID, 254 255 .formats = SNDRV_PCM_FMTBIT_S16_LE, 256 257 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 258 259 .rate_min = 48000, 260 .rate_max = 48000, 261 .channels_min = 2, 262 .channels_max = 2, 263 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 264 .period_bytes_min = 64, /* 12544/2, */ 265 .period_bytes_max = 12544, 266 .periods_min = 2, 267 .periods_max = 98, /* 12544, */ 268}; 269 270static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) 271{ 272 struct em28xx *dev = snd_pcm_substream_chip(substream); 273 struct snd_pcm_runtime *runtime = substream->runtime; 274 int ret = 0; 275 276 dprintk("opening device and trying to acquire exclusive lock\n"); 277 278 if (!dev) { 279 em28xx_err("BUG: em28xx can't find device struct." 280 " Can't proceed with open\n"); 281 return -ENODEV; 282 } 283 284 runtime->hw = snd_em28xx_hw_capture; 285 if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) { 286 if (dev->audio_ifnum) 287 dev->alt = 1; 288 else 289 dev->alt = 7; 290 291 dprintk("changing alternate number on interface %d to %d\n", 292 dev->audio_ifnum, dev->alt); 293 usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt); 294 295 /* Sets volume, mute, etc */ 296 dev->mute = 0; 297 mutex_lock(&dev->lock); 298 ret = em28xx_audio_analog_set(dev); 299 if (ret < 0) 300 goto err; 301 302 dev->adev.users++; 303 mutex_unlock(&dev->lock); 304 } 305 306 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 307 dev->adev.capture_pcm_substream = substream; 308 runtime->private_data = dev; 309 310 return 0; 311err: 312 mutex_unlock(&dev->lock); 313 314 em28xx_err("Error while configuring em28xx mixer\n"); 315 return ret; 316} 317 318static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 319{ 320 struct em28xx *dev = snd_pcm_substream_chip(substream); 321 322 dprintk("closing device\n"); 323 324 dev->mute = 1; 325 mutex_lock(&dev->lock); 326 dev->adev.users--; 327 if (atomic_read(&dev->stream_started) > 0) { 328 atomic_set(&dev->stream_started, 0); 329 schedule_work(&dev->wq_trigger); 330 } 331 332 em28xx_audio_analog_set(dev); 333 if (substream->runtime->dma_area) { 334 dprintk("freeing\n"); 335 vfree(substream->runtime->dma_area); 336 substream->runtime->dma_area = NULL; 337 } 338 mutex_unlock(&dev->lock); 339 340 return 0; 341} 342 343static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 344 struct snd_pcm_hw_params *hw_params) 345{ 346 unsigned int channels, rate, format; 347 int ret; 348 349 dprintk("Setting capture parameters\n"); 350 351 ret = snd_pcm_alloc_vmalloc_buffer(substream, 352 params_buffer_bytes(hw_params)); 353 if (ret < 0) 354 return ret; 355 format = params_format(hw_params); 356 rate = params_rate(hw_params); 357 channels = params_channels(hw_params); 358 359 /* TODO: set up em28xx audio chip to deliver the correct audio format, 360 current default is 48000hz multiplexed => 96000hz mono 361 which shouldn't matter since analogue TV only supports mono */ 362 return 0; 363} 364 365static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 366{ 367 struct em28xx *dev = snd_pcm_substream_chip(substream); 368 369 dprintk("Stop capture, if needed\n"); 370 371 if (atomic_read(&dev->stream_started) > 0) { 372 atomic_set(&dev->stream_started, 0); 373 schedule_work(&dev->wq_trigger); 374 } 375 376 return 0; 377} 378 379static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 380{ 381 struct em28xx *dev = snd_pcm_substream_chip(substream); 382 383 dev->adev.hwptr_done_capture = 0; 384 dev->adev.capture_transfer_done = 0; 385 386 return 0; 387} 388 389static void audio_trigger(struct work_struct *work) 390{ 391 struct em28xx *dev = container_of(work, struct em28xx, wq_trigger); 392 393 if (atomic_read(&dev->stream_started)) { 394 dprintk("starting capture"); 395 em28xx_init_audio_isoc(dev); 396 } else { 397 dprintk("stopping capture"); 398 em28xx_deinit_isoc_audio(dev); 399 } 400} 401 402static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 403 int cmd) 404{ 405 struct em28xx *dev = snd_pcm_substream_chip(substream); 406 int retval = 0; 407 408 switch (cmd) { 409 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 410 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 411 case SNDRV_PCM_TRIGGER_START: 412 atomic_set(&dev->stream_started, 1); 413 break; 414 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 415 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 416 case SNDRV_PCM_TRIGGER_STOP: 417 atomic_set(&dev->stream_started, 0); 418 break; 419 default: 420 retval = -EINVAL; 421 } 422 schedule_work(&dev->wq_trigger); 423 return retval; 424} 425 426static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 427 *substream) 428{ 429 unsigned long flags; 430 struct em28xx *dev; 431 snd_pcm_uframes_t hwptr_done; 432 433 dev = snd_pcm_substream_chip(substream); 434 spin_lock_irqsave(&dev->adev.slock, flags); 435 hwptr_done = dev->adev.hwptr_done_capture; 436 spin_unlock_irqrestore(&dev->adev.slock, flags); 437 438 return hwptr_done; 439} 440 441static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 442 unsigned long offset) 443{ 444 void *pageptr = subs->runtime->dma_area + offset; 445 446 return vmalloc_to_page(pageptr); 447} 448 449/* 450 * AC97 volume control support 451 */ 452static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 453 struct snd_ctl_elem_info *info) 454{ 455 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 456 info->count = 2; 457 info->value.integer.min = 0; 458 info->value.integer.max = 0x1f; 459 460 return 0; 461} 462 463static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 464 struct snd_ctl_elem_value *value) 465{ 466 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 467 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 468 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 469 int rc; 470 471 mutex_lock(&dev->lock); 472 rc = em28xx_read_ac97(dev, kcontrol->private_value); 473 if (rc < 0) 474 goto err; 475 476 val |= rc & 0x8000; /* Preserve the mute flag */ 477 478 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 479 if (rc < 0) 480 goto err; 481 482 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 483 (val & 0x8000) ? "muted " : "", 484 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 485 val, (int)kcontrol->private_value); 486 487err: 488 mutex_unlock(&dev->lock); 489 return rc; 490} 491 492static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 493 struct snd_ctl_elem_value *value) 494{ 495 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 496 int val; 497 498 mutex_lock(&dev->lock); 499 val = em28xx_read_ac97(dev, kcontrol->private_value); 500 mutex_unlock(&dev->lock); 501 if (val < 0) 502 return val; 503 504 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 505 (val & 0x8000) ? "muted " : "", 506 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 507 val, (int)kcontrol->private_value); 508 509 value->value.integer.value[0] = 0x1f - (val & 0x1f); 510 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); 511 512 return 0; 513} 514 515static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 516 struct snd_ctl_elem_value *value) 517{ 518 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 519 u16 val = value->value.integer.value[0]; 520 int rc; 521 522 mutex_lock(&dev->lock); 523 rc = em28xx_read_ac97(dev, kcontrol->private_value); 524 if (rc < 0) 525 goto err; 526 527 if (val) 528 rc &= 0x1f1f; 529 else 530 rc |= 0x8000; 531 532 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 533 if (rc < 0) 534 goto err; 535 536 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 537 (val & 0x8000) ? "muted " : "", 538 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 539 val, (int)kcontrol->private_value); 540 541err: 542 mutex_unlock(&dev->lock); 543 return rc; 544} 545 546static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 547 struct snd_ctl_elem_value *value) 548{ 549 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 550 int val; 551 552 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 if (val & 0x8000) 559 value->value.integer.value[0] = 0; 560 else 561 value->value.integer.value[0] = 1; 562 563 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 564 (val & 0x8000) ? "muted " : "", 565 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 566 val, (int)kcontrol->private_value); 567 568 return 0; 569} 570 571static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 572 573static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 574 char *name, int id) 575{ 576 int err; 577 char ctl_name[44]; 578 struct snd_kcontrol *kctl; 579 struct snd_kcontrol_new tmp; 580 581 memset (&tmp, 0, sizeof(tmp)); 582 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 583 tmp.private_value = id, 584 tmp.name = ctl_name, 585 586 /* Add Mute Control */ 587 sprintf(ctl_name, "%s Switch", name); 588 tmp.get = em28xx_vol_get_mute; 589 tmp.put = em28xx_vol_put_mute; 590 tmp.info = snd_ctl_boolean_mono_info; 591 kctl = snd_ctl_new1(&tmp, dev); 592 err = snd_ctl_add(card, kctl); 593 if (err < 0) 594 return err; 595 dprintk("Added control %s for ac97 volume control 0x%04x\n", 596 ctl_name, id); 597 598 memset (&tmp, 0, sizeof(tmp)); 599 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 600 tmp.private_value = id, 601 tmp.name = ctl_name, 602 603 /* Add Volume Control */ 604 sprintf(ctl_name, "%s Volume", name); 605 tmp.get = em28xx_vol_get; 606 tmp.put = em28xx_vol_put; 607 tmp.info = em28xx_vol_info; 608 tmp.tlv.p = em28xx_db_scale, 609 kctl = snd_ctl_new1(&tmp, dev); 610 err = snd_ctl_add(card, kctl); 611 if (err < 0) 612 return err; 613 dprintk("Added control %s for ac97 volume control 0x%04x\n", 614 ctl_name, id); 615 616 return 0; 617} 618 619/* 620 * register/unregister code and data 621 */ 622static struct snd_pcm_ops snd_em28xx_pcm_capture = { 623 .open = snd_em28xx_capture_open, 624 .close = snd_em28xx_pcm_close, 625 .ioctl = snd_pcm_lib_ioctl, 626 .hw_params = snd_em28xx_hw_capture_params, 627 .hw_free = snd_em28xx_hw_capture_free, 628 .prepare = snd_em28xx_prepare, 629 .trigger = snd_em28xx_capture_trigger, 630 .pointer = snd_em28xx_capture_pointer, 631 .page = snd_pcm_get_vmalloc_page, 632}; 633 634static int em28xx_audio_init(struct em28xx *dev) 635{ 636 struct em28xx_audio *adev = &dev->adev; 637 struct snd_pcm *pcm; 638 struct snd_card *card; 639 static int devnr; 640 int err; 641 642 if (!dev->has_alsa_audio || dev->audio_ifnum < 0) { 643 /* This device does not support the extension (in this case 644 the device is expecting the snd-usb-audio module or 645 doesn't have analog audio support at all) */ 646 return 0; 647 } 648 649 printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n"); 650 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " 651 "Rechberger\n"); 652 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n"); 653 654 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0, 655 &card); 656 if (err < 0) 657 return err; 658 659 spin_lock_init(&adev->slock); 660 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 661 if (err < 0) { 662 snd_card_free(card); 663 return err; 664 } 665 666 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 667 pcm->info_flags = 0; 668 pcm->private_data = dev; 669 strcpy(pcm->name, "Empia 28xx Capture"); 670 671 snd_card_set_dev(card, &dev->udev->dev); 672 strcpy(card->driver, "Em28xx-Audio"); 673 strcpy(card->shortname, "Em28xx Audio"); 674 strcpy(card->longname, "Empia Em28xx Audio"); 675 676 INIT_WORK(&dev->wq_trigger, audio_trigger); 677 678 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 679 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL); 680 em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL); 681 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL); 682 em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL); 683 em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL); 684 em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL); 685 em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL); 686 687 em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL); 688 em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL); 689 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL); 690 em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL); 691 em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL); 692 } 693 694 err = snd_card_register(card); 695 if (err < 0) { 696 snd_card_free(card); 697 return err; 698 } 699 adev->sndcard = card; 700 adev->udev = dev->udev; 701 702 return 0; 703} 704 705static int em28xx_audio_fini(struct em28xx *dev) 706{ 707 if (dev == NULL) 708 return 0; 709 710 if (dev->has_alsa_audio != 1) { 711 /* This device does not support the extension (in this case 712 the device is expecting the snd-usb-audio module or 713 doesn't have analog audio support at all) */ 714 return 0; 715 } 716 717 if (dev->adev.sndcard) { 718 snd_card_free(dev->adev.sndcard); 719 dev->adev.sndcard = NULL; 720 } 721 722 return 0; 723} 724 725static struct em28xx_ops audio_ops = { 726 .id = EM28XX_AUDIO, 727 .name = "Em28xx Audio Extension", 728 .init = em28xx_audio_init, 729 .fini = em28xx_audio_fini, 730}; 731 732static int __init em28xx_alsa_register(void) 733{ 734 return em28xx_register_extension(&audio_ops); 735} 736 737static void __exit em28xx_alsa_unregister(void) 738{ 739 em28xx_unregister_extension(&audio_ops); 740} 741 742MODULE_LICENSE("GPL"); 743MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 744MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>"); 745MODULE_DESCRIPTION("Em28xx Audio driver"); 746 747module_init(em28xx_alsa_register); 748module_exit(em28xx_alsa_unregister); 749