1 /* 2 * Conexant Cx231xx audio extension 3 * 4 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com> 5 * Based on em28xx driver 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include "cx231xx.h" 24 #include <linux/kernel.h> 25 #include <linux/init.h> 26 #include <linux/sound.h> 27 #include <linux/spinlock.h> 28 #include <linux/soundcard.h> 29 #include <linux/slab.h> 30 #include <linux/vmalloc.h> 31 #include <linux/proc_fs.h> 32 #include <linux/module.h> 33 #include <sound/core.h> 34 #include <sound/pcm.h> 35 #include <sound/pcm_params.h> 36 #include <sound/info.h> 37 #include <sound/initval.h> 38 #include <sound/control.h> 39 #include <media/v4l2-common.h> 40 41 static int debug; 42 module_param(debug, int, 0644); 43 MODULE_PARM_DESC(debug, "activates debug info"); 44 45 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 46 47 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev) 48 { 49 int i; 50 51 dev_dbg(dev->dev, "Stopping isoc\n"); 52 53 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 54 if (dev->adev.urb[i]) { 55 if (!irqs_disabled()) 56 usb_kill_urb(dev->adev.urb[i]); 57 else 58 usb_unlink_urb(dev->adev.urb[i]); 59 60 usb_free_urb(dev->adev.urb[i]); 61 dev->adev.urb[i] = NULL; 62 63 kfree(dev->adev.transfer_buffer[i]); 64 dev->adev.transfer_buffer[i] = NULL; 65 } 66 } 67 68 return 0; 69 } 70 71 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev) 72 { 73 int i; 74 75 dev_dbg(dev->dev, "Stopping bulk\n"); 76 77 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 78 if (dev->adev.urb[i]) { 79 if (!irqs_disabled()) 80 usb_kill_urb(dev->adev.urb[i]); 81 else 82 usb_unlink_urb(dev->adev.urb[i]); 83 84 usb_free_urb(dev->adev.urb[i]); 85 dev->adev.urb[i] = NULL; 86 87 kfree(dev->adev.transfer_buffer[i]); 88 dev->adev.transfer_buffer[i] = NULL; 89 } 90 } 91 92 return 0; 93 } 94 95 static void cx231xx_audio_isocirq(struct urb *urb) 96 { 97 struct cx231xx *dev = urb->context; 98 int i; 99 unsigned int oldptr; 100 int period_elapsed = 0; 101 int status; 102 unsigned char *cp; 103 unsigned int stride; 104 struct snd_pcm_substream *substream; 105 struct snd_pcm_runtime *runtime; 106 107 if (dev->state & DEV_DISCONNECTED) 108 return; 109 110 switch (urb->status) { 111 case 0: /* success */ 112 case -ETIMEDOUT: /* NAK */ 113 break; 114 case -ECONNRESET: /* kill */ 115 case -ENOENT: 116 case -ESHUTDOWN: 117 return; 118 default: /* error */ 119 dev_dbg(dev->dev, "urb completition error %d.\n", 120 urb->status); 121 break; 122 } 123 124 if (atomic_read(&dev->stream_started) == 0) 125 return; 126 127 if (dev->adev.capture_pcm_substream) { 128 substream = dev->adev.capture_pcm_substream; 129 runtime = substream->runtime; 130 stride = runtime->frame_bits >> 3; 131 132 for (i = 0; i < urb->number_of_packets; i++) { 133 int length = urb->iso_frame_desc[i].actual_length / 134 stride; 135 cp = (unsigned char *)urb->transfer_buffer + 136 urb->iso_frame_desc[i].offset; 137 138 if (!length) 139 continue; 140 141 oldptr = dev->adev.hwptr_done_capture; 142 if (oldptr + length >= runtime->buffer_size) { 143 unsigned int cnt; 144 145 cnt = runtime->buffer_size - oldptr; 146 memcpy(runtime->dma_area + oldptr * stride, cp, 147 cnt * stride); 148 memcpy(runtime->dma_area, cp + cnt * stride, 149 length * stride - cnt * stride); 150 } else { 151 memcpy(runtime->dma_area + oldptr * stride, cp, 152 length * stride); 153 } 154 155 snd_pcm_stream_lock(substream); 156 157 dev->adev.hwptr_done_capture += length; 158 if (dev->adev.hwptr_done_capture >= 159 runtime->buffer_size) 160 dev->adev.hwptr_done_capture -= 161 runtime->buffer_size; 162 163 dev->adev.capture_transfer_done += length; 164 if (dev->adev.capture_transfer_done >= 165 runtime->period_size) { 166 dev->adev.capture_transfer_done -= 167 runtime->period_size; 168 period_elapsed = 1; 169 } 170 snd_pcm_stream_unlock(substream); 171 } 172 if (period_elapsed) 173 snd_pcm_period_elapsed(substream); 174 } 175 urb->status = 0; 176 177 status = usb_submit_urb(urb, GFP_ATOMIC); 178 if (status < 0) { 179 dev_err(dev->dev, 180 "resubmit of audio urb failed (error=%i)\n", 181 status); 182 } 183 return; 184 } 185 186 static void cx231xx_audio_bulkirq(struct urb *urb) 187 { 188 struct cx231xx *dev = urb->context; 189 unsigned int oldptr; 190 int period_elapsed = 0; 191 int status; 192 unsigned char *cp; 193 unsigned int stride; 194 struct snd_pcm_substream *substream; 195 struct snd_pcm_runtime *runtime; 196 197 if (dev->state & DEV_DISCONNECTED) 198 return; 199 200 switch (urb->status) { 201 case 0: /* success */ 202 case -ETIMEDOUT: /* NAK */ 203 break; 204 case -ECONNRESET: /* kill */ 205 case -ENOENT: 206 case -ESHUTDOWN: 207 return; 208 default: /* error */ 209 dev_dbg(dev->dev, "urb completition error %d.\n", 210 urb->status); 211 break; 212 } 213 214 if (atomic_read(&dev->stream_started) == 0) 215 return; 216 217 if (dev->adev.capture_pcm_substream) { 218 substream = dev->adev.capture_pcm_substream; 219 runtime = substream->runtime; 220 stride = runtime->frame_bits >> 3; 221 222 if (1) { 223 int length = urb->actual_length / 224 stride; 225 cp = (unsigned char *)urb->transfer_buffer; 226 227 oldptr = dev->adev.hwptr_done_capture; 228 if (oldptr + length >= runtime->buffer_size) { 229 unsigned int cnt; 230 231 cnt = runtime->buffer_size - oldptr; 232 memcpy(runtime->dma_area + oldptr * stride, cp, 233 cnt * stride); 234 memcpy(runtime->dma_area, cp + cnt * stride, 235 length * stride - cnt * stride); 236 } else { 237 memcpy(runtime->dma_area + oldptr * stride, cp, 238 length * stride); 239 } 240 241 snd_pcm_stream_lock(substream); 242 243 dev->adev.hwptr_done_capture += length; 244 if (dev->adev.hwptr_done_capture >= 245 runtime->buffer_size) 246 dev->adev.hwptr_done_capture -= 247 runtime->buffer_size; 248 249 dev->adev.capture_transfer_done += length; 250 if (dev->adev.capture_transfer_done >= 251 runtime->period_size) { 252 dev->adev.capture_transfer_done -= 253 runtime->period_size; 254 period_elapsed = 1; 255 } 256 snd_pcm_stream_unlock(substream); 257 } 258 if (period_elapsed) 259 snd_pcm_period_elapsed(substream); 260 } 261 urb->status = 0; 262 263 status = usb_submit_urb(urb, GFP_ATOMIC); 264 if (status < 0) { 265 dev_err(dev->dev, 266 "resubmit of audio urb failed (error=%i)\n", 267 status); 268 } 269 return; 270 } 271 272 static int cx231xx_init_audio_isoc(struct cx231xx *dev) 273 { 274 int i, errCode; 275 int sb_size; 276 277 dev_dbg(dev->dev, 278 "%s: Starting ISO AUDIO transfers\n", __func__); 279 280 if (dev->state & DEV_DISCONNECTED) 281 return -ENODEV; 282 283 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 284 285 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 286 struct urb *urb; 287 int j, k; 288 289 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 290 if (!dev->adev.transfer_buffer[i]) 291 return -ENOMEM; 292 293 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 294 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC); 295 if (!urb) { 296 dev_err(dev->dev, "usb_alloc_urb failed!\n"); 297 for (j = 0; j < i; j++) { 298 usb_free_urb(dev->adev.urb[j]); 299 kfree(dev->adev.transfer_buffer[j]); 300 } 301 return -ENOMEM; 302 } 303 304 urb->dev = dev->udev; 305 urb->context = dev; 306 urb->pipe = usb_rcvisocpipe(dev->udev, 307 dev->adev.end_point_addr); 308 urb->transfer_flags = URB_ISO_ASAP; 309 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 310 urb->interval = 1; 311 urb->complete = cx231xx_audio_isocirq; 312 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS; 313 urb->transfer_buffer_length = sb_size; 314 315 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS; 316 j++, k += dev->adev.max_pkt_size) { 317 urb->iso_frame_desc[j].offset = k; 318 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size; 319 } 320 dev->adev.urb[i] = urb; 321 } 322 323 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 324 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 325 if (errCode < 0) { 326 cx231xx_isoc_audio_deinit(dev); 327 return errCode; 328 } 329 } 330 331 return errCode; 332 } 333 334 static int cx231xx_init_audio_bulk(struct cx231xx *dev) 335 { 336 int i, errCode; 337 int sb_size; 338 339 dev_dbg(dev->dev, 340 "%s: Starting BULK AUDIO transfers\n", __func__); 341 342 if (dev->state & DEV_DISCONNECTED) 343 return -ENODEV; 344 345 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 346 347 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 348 struct urb *urb; 349 int j; 350 351 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 352 if (!dev->adev.transfer_buffer[i]) 353 return -ENOMEM; 354 355 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 356 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 357 if (!urb) { 358 dev_err(dev->dev, "usb_alloc_urb failed!\n"); 359 for (j = 0; j < i; j++) { 360 usb_free_urb(dev->adev.urb[j]); 361 kfree(dev->adev.transfer_buffer[j]); 362 } 363 return -ENOMEM; 364 } 365 366 urb->dev = dev->udev; 367 urb->context = dev; 368 urb->pipe = usb_rcvbulkpipe(dev->udev, 369 dev->adev.end_point_addr); 370 urb->transfer_flags = 0; 371 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 372 urb->complete = cx231xx_audio_bulkirq; 373 urb->transfer_buffer_length = sb_size; 374 375 dev->adev.urb[i] = urb; 376 377 } 378 379 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 380 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 381 if (errCode < 0) { 382 cx231xx_bulk_audio_deinit(dev); 383 return errCode; 384 } 385 } 386 387 return errCode; 388 } 389 390 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 391 size_t size) 392 { 393 struct snd_pcm_runtime *runtime = subs->runtime; 394 struct cx231xx *dev = snd_pcm_substream_chip(subs); 395 396 dev_dbg(dev->dev, "Allocating vbuffer\n"); 397 if (runtime->dma_area) { 398 if (runtime->dma_bytes > size) 399 return 0; 400 401 vfree(runtime->dma_area); 402 } 403 runtime->dma_area = vmalloc(size); 404 if (!runtime->dma_area) 405 return -ENOMEM; 406 407 runtime->dma_bytes = size; 408 409 return 0; 410 } 411 412 static struct snd_pcm_hardware snd_cx231xx_hw_capture = { 413 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 414 SNDRV_PCM_INFO_MMAP | 415 SNDRV_PCM_INFO_INTERLEAVED | 416 SNDRV_PCM_INFO_MMAP_VALID, 417 418 .formats = SNDRV_PCM_FMTBIT_S16_LE, 419 420 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 421 422 .rate_min = 48000, 423 .rate_max = 48000, 424 .channels_min = 2, 425 .channels_max = 2, 426 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 427 .period_bytes_min = 64, /* 12544/2, */ 428 .period_bytes_max = 12544, 429 .periods_min = 2, 430 .periods_max = 98, /* 12544, */ 431 }; 432 433 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream) 434 { 435 struct cx231xx *dev = snd_pcm_substream_chip(substream); 436 struct snd_pcm_runtime *runtime = substream->runtime; 437 int ret = 0; 438 439 dev_dbg(dev->dev, 440 "opening device and trying to acquire exclusive lock\n"); 441 442 if (dev->state & DEV_DISCONNECTED) { 443 dev_err(dev->dev, 444 "Can't open. the device was removed.\n"); 445 return -ENODEV; 446 } 447 448 /* set alternate setting for audio interface */ 449 /* 1 - 48000 samples per sec */ 450 mutex_lock(&dev->lock); 451 if (dev->USE_ISO) 452 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 453 else 454 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 455 mutex_unlock(&dev->lock); 456 if (ret < 0) { 457 dev_err(dev->dev, 458 "failed to set alternate setting !\n"); 459 460 return ret; 461 } 462 463 runtime->hw = snd_cx231xx_hw_capture; 464 465 mutex_lock(&dev->lock); 466 /* inform hardware to start streaming */ 467 ret = cx231xx_capture_start(dev, 1, Audio); 468 469 dev->adev.users++; 470 mutex_unlock(&dev->lock); 471 472 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 473 dev->adev.capture_pcm_substream = substream; 474 runtime->private_data = dev; 475 476 return 0; 477 } 478 479 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 480 { 481 int ret; 482 struct cx231xx *dev = snd_pcm_substream_chip(substream); 483 484 dev_dbg(dev->dev, "closing device\n"); 485 486 /* inform hardware to stop streaming */ 487 mutex_lock(&dev->lock); 488 ret = cx231xx_capture_start(dev, 0, Audio); 489 490 /* set alternate setting for audio interface */ 491 /* 1 - 48000 samples per sec */ 492 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 493 if (ret < 0) { 494 dev_err(dev->dev, 495 "failed to set alternate setting !\n"); 496 497 mutex_unlock(&dev->lock); 498 return ret; 499 } 500 501 dev->adev.users--; 502 if (substream->runtime->dma_area) { 503 dev_dbg(dev->dev, "freeing\n"); 504 vfree(substream->runtime->dma_area); 505 substream->runtime->dma_area = NULL; 506 } 507 mutex_unlock(&dev->lock); 508 509 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 510 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users); 511 dev_dbg(dev->dev, "disabling audio stream!\n"); 512 dev->adev.shutdown = 0; 513 dev_dbg(dev->dev, "released lock\n"); 514 if (atomic_read(&dev->stream_started) > 0) { 515 atomic_set(&dev->stream_started, 0); 516 schedule_work(&dev->wq_trigger); 517 } 518 } 519 return 0; 520 } 521 522 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 523 struct snd_pcm_hw_params *hw_params) 524 { 525 struct cx231xx *dev = snd_pcm_substream_chip(substream); 526 int ret; 527 528 dev_dbg(dev->dev, "Setting capture parameters\n"); 529 530 ret = snd_pcm_alloc_vmalloc_buffer(substream, 531 params_buffer_bytes(hw_params)); 532 #if 0 533 /* TODO: set up cx231xx audio chip to deliver the correct audio format, 534 current default is 48000hz multiplexed => 96000hz mono 535 which shouldn't matter since analogue TV only supports mono */ 536 unsigned int channels, rate, format; 537 538 format = params_format(hw_params); 539 rate = params_rate(hw_params); 540 channels = params_channels(hw_params); 541 #endif 542 543 return ret; 544 } 545 546 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream) 547 { 548 struct cx231xx *dev = snd_pcm_substream_chip(substream); 549 550 dev_dbg(dev->dev, "Stop capture, if needed\n"); 551 552 if (atomic_read(&dev->stream_started) > 0) { 553 atomic_set(&dev->stream_started, 0); 554 schedule_work(&dev->wq_trigger); 555 } 556 557 return 0; 558 } 559 560 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream) 561 { 562 struct cx231xx *dev = snd_pcm_substream_chip(substream); 563 564 dev->adev.hwptr_done_capture = 0; 565 dev->adev.capture_transfer_done = 0; 566 567 return 0; 568 } 569 570 static void audio_trigger(struct work_struct *work) 571 { 572 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger); 573 574 if (atomic_read(&dev->stream_started)) { 575 dev_dbg(dev->dev, "starting capture"); 576 if (is_fw_load(dev) == 0) 577 cx25840_call(dev, core, load_fw); 578 if (dev->USE_ISO) 579 cx231xx_init_audio_isoc(dev); 580 else 581 cx231xx_init_audio_bulk(dev); 582 } else { 583 dev_dbg(dev->dev, "stopping capture"); 584 cx231xx_isoc_audio_deinit(dev); 585 } 586 } 587 588 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream, 589 int cmd) 590 { 591 struct cx231xx *dev = snd_pcm_substream_chip(substream); 592 int retval = 0; 593 594 if (dev->state & DEV_DISCONNECTED) 595 return -ENODEV; 596 597 spin_lock(&dev->adev.slock); 598 switch (cmd) { 599 case SNDRV_PCM_TRIGGER_START: 600 atomic_set(&dev->stream_started, 1); 601 break; 602 case SNDRV_PCM_TRIGGER_STOP: 603 atomic_set(&dev->stream_started, 0); 604 break; 605 default: 606 retval = -EINVAL; 607 break; 608 } 609 spin_unlock(&dev->adev.slock); 610 611 schedule_work(&dev->wq_trigger); 612 613 return retval; 614 } 615 616 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream 617 *substream) 618 { 619 struct cx231xx *dev; 620 unsigned long flags; 621 snd_pcm_uframes_t hwptr_done; 622 623 dev = snd_pcm_substream_chip(substream); 624 625 spin_lock_irqsave(&dev->adev.slock, flags); 626 hwptr_done = dev->adev.hwptr_done_capture; 627 spin_unlock_irqrestore(&dev->adev.slock, flags); 628 629 return hwptr_done; 630 } 631 632 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 633 unsigned long offset) 634 { 635 void *pageptr = subs->runtime->dma_area + offset; 636 637 return vmalloc_to_page(pageptr); 638 } 639 640 static struct snd_pcm_ops snd_cx231xx_pcm_capture = { 641 .open = snd_cx231xx_capture_open, 642 .close = snd_cx231xx_pcm_close, 643 .ioctl = snd_pcm_lib_ioctl, 644 .hw_params = snd_cx231xx_hw_capture_params, 645 .hw_free = snd_cx231xx_hw_capture_free, 646 .prepare = snd_cx231xx_prepare, 647 .trigger = snd_cx231xx_capture_trigger, 648 .pointer = snd_cx231xx_capture_pointer, 649 .page = snd_pcm_get_vmalloc_page, 650 }; 651 652 static int cx231xx_audio_init(struct cx231xx *dev) 653 { 654 struct cx231xx_audio *adev = &dev->adev; 655 struct snd_pcm *pcm; 656 struct snd_card *card; 657 static int devnr; 658 int err; 659 struct usb_interface *uif; 660 int i, isoc_pipe = 0; 661 662 if (dev->has_alsa_audio != 1) { 663 /* This device does not support the extension (in this case 664 the device is expecting the snd-usb-audio module or 665 doesn't have analog audio support at all) */ 666 return 0; 667 } 668 669 dev_dbg(dev->dev, 670 "probing for cx231xx non standard usbaudio\n"); 671 672 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio", 673 THIS_MODULE, 0, &card); 674 if (err < 0) 675 return err; 676 677 spin_lock_init(&adev->slock); 678 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm); 679 if (err < 0) { 680 snd_card_free(card); 681 return err; 682 } 683 684 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 685 &snd_cx231xx_pcm_capture); 686 pcm->info_flags = 0; 687 pcm->private_data = dev; 688 strcpy(pcm->name, "Conexant cx231xx Capture"); 689 strcpy(card->driver, "Cx231xx-Audio"); 690 strcpy(card->shortname, "Cx231xx Audio"); 691 strcpy(card->longname, "Conexant cx231xx Audio"); 692 693 INIT_WORK(&dev->wq_trigger, audio_trigger); 694 695 err = snd_card_register(card); 696 if (err < 0) { 697 snd_card_free(card); 698 return err; 699 } 700 adev->sndcard = card; 701 adev->udev = dev->udev; 702 703 /* compute alternate max packet sizes for Audio */ 704 uif = 705 dev->udev->actconfig->interface[dev->current_pcb_config. 706 hs_config_info[0].interface_info. 707 audio_index + 1]; 708 709 adev->end_point_addr = 710 uif->altsetting[0].endpoint[isoc_pipe].desc. 711 bEndpointAddress; 712 713 adev->num_alt = uif->num_altsetting; 714 dev_info(dev->dev, 715 "audio EndPoint Addr 0x%x, Alternate settings: %i\n", 716 adev->end_point_addr, adev->num_alt); 717 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL); 718 719 if (adev->alt_max_pkt_size == NULL) 720 return -ENOMEM; 721 722 for (i = 0; i < adev->num_alt; i++) { 723 u16 tmp = 724 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc. 725 wMaxPacketSize); 726 adev->alt_max_pkt_size[i] = 727 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1); 728 dev_dbg(dev->dev, 729 "audio alternate setting %i, max size= %i\n", i, 730 adev->alt_max_pkt_size[i]); 731 } 732 733 return 0; 734 } 735 736 static int cx231xx_audio_fini(struct cx231xx *dev) 737 { 738 if (dev == NULL) 739 return 0; 740 741 if (dev->has_alsa_audio != 1) { 742 /* This device does not support the extension (in this case 743 the device is expecting the snd-usb-audio module or 744 doesn't have analog audio support at all) */ 745 return 0; 746 } 747 748 if (dev->adev.sndcard) { 749 snd_card_free(dev->adev.sndcard); 750 kfree(dev->adev.alt_max_pkt_size); 751 dev->adev.sndcard = NULL; 752 } 753 754 return 0; 755 } 756 757 static struct cx231xx_ops audio_ops = { 758 .id = CX231XX_AUDIO, 759 .name = "Cx231xx Audio Extension", 760 .init = cx231xx_audio_init, 761 .fini = cx231xx_audio_fini, 762 }; 763 764 static int __init cx231xx_alsa_register(void) 765 { 766 return cx231xx_register_extension(&audio_ops); 767 } 768 769 static void __exit cx231xx_alsa_unregister(void) 770 { 771 cx231xx_unregister_extension(&audio_ops); 772 } 773 774 MODULE_LICENSE("GPL"); 775 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 776 MODULE_DESCRIPTION("Cx231xx Audio driver"); 777 778 module_init(cx231xx_alsa_register); 779 module_exit(cx231xx_alsa_unregister); 780