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 for (j = 0; j < i; j++) { 297 usb_free_urb(dev->adev.urb[j]); 298 kfree(dev->adev.transfer_buffer[j]); 299 } 300 return -ENOMEM; 301 } 302 303 urb->dev = dev->udev; 304 urb->context = dev; 305 urb->pipe = usb_rcvisocpipe(dev->udev, 306 dev->adev.end_point_addr); 307 urb->transfer_flags = URB_ISO_ASAP; 308 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 309 urb->interval = 1; 310 urb->complete = cx231xx_audio_isocirq; 311 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS; 312 urb->transfer_buffer_length = sb_size; 313 314 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS; 315 j++, k += dev->adev.max_pkt_size) { 316 urb->iso_frame_desc[j].offset = k; 317 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size; 318 } 319 dev->adev.urb[i] = urb; 320 } 321 322 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 323 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 324 if (errCode < 0) { 325 cx231xx_isoc_audio_deinit(dev); 326 return errCode; 327 } 328 } 329 330 return errCode; 331 } 332 333 static int cx231xx_init_audio_bulk(struct cx231xx *dev) 334 { 335 int i, errCode; 336 int sb_size; 337 338 dev_dbg(dev->dev, 339 "%s: Starting BULK AUDIO transfers\n", __func__); 340 341 if (dev->state & DEV_DISCONNECTED) 342 return -ENODEV; 343 344 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 345 346 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 347 struct urb *urb; 348 int j; 349 350 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 351 if (!dev->adev.transfer_buffer[i]) 352 return -ENOMEM; 353 354 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 355 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 356 if (!urb) { 357 for (j = 0; j < i; j++) { 358 usb_free_urb(dev->adev.urb[j]); 359 kfree(dev->adev.transfer_buffer[j]); 360 } 361 return -ENOMEM; 362 } 363 364 urb->dev = dev->udev; 365 urb->context = dev; 366 urb->pipe = usb_rcvbulkpipe(dev->udev, 367 dev->adev.end_point_addr); 368 urb->transfer_flags = 0; 369 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 370 urb->complete = cx231xx_audio_bulkirq; 371 urb->transfer_buffer_length = sb_size; 372 373 dev->adev.urb[i] = urb; 374 375 } 376 377 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 378 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 379 if (errCode < 0) { 380 cx231xx_bulk_audio_deinit(dev); 381 return errCode; 382 } 383 } 384 385 return errCode; 386 } 387 388 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 389 size_t size) 390 { 391 struct snd_pcm_runtime *runtime = subs->runtime; 392 struct cx231xx *dev = snd_pcm_substream_chip(subs); 393 394 dev_dbg(dev->dev, "Allocating vbuffer\n"); 395 if (runtime->dma_area) { 396 if (runtime->dma_bytes > size) 397 return 0; 398 399 vfree(runtime->dma_area); 400 } 401 runtime->dma_area = vmalloc(size); 402 if (!runtime->dma_area) 403 return -ENOMEM; 404 405 runtime->dma_bytes = size; 406 407 return 0; 408 } 409 410 static struct snd_pcm_hardware snd_cx231xx_hw_capture = { 411 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 412 SNDRV_PCM_INFO_MMAP | 413 SNDRV_PCM_INFO_INTERLEAVED | 414 SNDRV_PCM_INFO_MMAP_VALID, 415 416 .formats = SNDRV_PCM_FMTBIT_S16_LE, 417 418 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 419 420 .rate_min = 48000, 421 .rate_max = 48000, 422 .channels_min = 2, 423 .channels_max = 2, 424 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 425 .period_bytes_min = 64, /* 12544/2, */ 426 .period_bytes_max = 12544, 427 .periods_min = 2, 428 .periods_max = 98, /* 12544, */ 429 }; 430 431 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream) 432 { 433 struct cx231xx *dev = snd_pcm_substream_chip(substream); 434 struct snd_pcm_runtime *runtime = substream->runtime; 435 int ret = 0; 436 437 dev_dbg(dev->dev, 438 "opening device and trying to acquire exclusive lock\n"); 439 440 if (dev->state & DEV_DISCONNECTED) { 441 dev_err(dev->dev, 442 "Can't open. the device was removed.\n"); 443 return -ENODEV; 444 } 445 446 /* set alternate setting for audio interface */ 447 /* 1 - 48000 samples per sec */ 448 mutex_lock(&dev->lock); 449 if (dev->USE_ISO) 450 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 451 else 452 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 453 mutex_unlock(&dev->lock); 454 if (ret < 0) { 455 dev_err(dev->dev, 456 "failed to set alternate setting !\n"); 457 458 return ret; 459 } 460 461 runtime->hw = snd_cx231xx_hw_capture; 462 463 mutex_lock(&dev->lock); 464 /* inform hardware to start streaming */ 465 ret = cx231xx_capture_start(dev, 1, Audio); 466 467 dev->adev.users++; 468 mutex_unlock(&dev->lock); 469 470 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 471 dev->adev.capture_pcm_substream = substream; 472 runtime->private_data = dev; 473 474 return 0; 475 } 476 477 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 478 { 479 int ret; 480 struct cx231xx *dev = snd_pcm_substream_chip(substream); 481 482 dev_dbg(dev->dev, "closing device\n"); 483 484 /* inform hardware to stop streaming */ 485 mutex_lock(&dev->lock); 486 ret = cx231xx_capture_start(dev, 0, Audio); 487 488 /* set alternate setting for audio interface */ 489 /* 1 - 48000 samples per sec */ 490 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 491 if (ret < 0) { 492 dev_err(dev->dev, 493 "failed to set alternate setting !\n"); 494 495 mutex_unlock(&dev->lock); 496 return ret; 497 } 498 499 dev->adev.users--; 500 if (substream->runtime->dma_area) { 501 dev_dbg(dev->dev, "freeing\n"); 502 vfree(substream->runtime->dma_area); 503 substream->runtime->dma_area = NULL; 504 } 505 mutex_unlock(&dev->lock); 506 507 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 508 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users); 509 dev_dbg(dev->dev, "disabling audio stream!\n"); 510 dev->adev.shutdown = 0; 511 dev_dbg(dev->dev, "released lock\n"); 512 if (atomic_read(&dev->stream_started) > 0) { 513 atomic_set(&dev->stream_started, 0); 514 schedule_work(&dev->wq_trigger); 515 } 516 } 517 return 0; 518 } 519 520 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 521 struct snd_pcm_hw_params *hw_params) 522 { 523 struct cx231xx *dev = snd_pcm_substream_chip(substream); 524 int ret; 525 526 dev_dbg(dev->dev, "Setting capture parameters\n"); 527 528 ret = snd_pcm_alloc_vmalloc_buffer(substream, 529 params_buffer_bytes(hw_params)); 530 #if 0 531 /* TODO: set up cx231xx audio chip to deliver the correct audio format, 532 current default is 48000hz multiplexed => 96000hz mono 533 which shouldn't matter since analogue TV only supports mono */ 534 unsigned int channels, rate, format; 535 536 format = params_format(hw_params); 537 rate = params_rate(hw_params); 538 channels = params_channels(hw_params); 539 #endif 540 541 return ret; 542 } 543 544 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream) 545 { 546 struct cx231xx *dev = snd_pcm_substream_chip(substream); 547 548 dev_dbg(dev->dev, "Stop capture, if needed\n"); 549 550 if (atomic_read(&dev->stream_started) > 0) { 551 atomic_set(&dev->stream_started, 0); 552 schedule_work(&dev->wq_trigger); 553 } 554 555 return 0; 556 } 557 558 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream) 559 { 560 struct cx231xx *dev = snd_pcm_substream_chip(substream); 561 562 dev->adev.hwptr_done_capture = 0; 563 dev->adev.capture_transfer_done = 0; 564 565 return 0; 566 } 567 568 static void audio_trigger(struct work_struct *work) 569 { 570 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger); 571 572 if (atomic_read(&dev->stream_started)) { 573 dev_dbg(dev->dev, "starting capture"); 574 if (is_fw_load(dev) == 0) 575 cx25840_call(dev, core, load_fw); 576 if (dev->USE_ISO) 577 cx231xx_init_audio_isoc(dev); 578 else 579 cx231xx_init_audio_bulk(dev); 580 } else { 581 dev_dbg(dev->dev, "stopping capture"); 582 cx231xx_isoc_audio_deinit(dev); 583 } 584 } 585 586 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream, 587 int cmd) 588 { 589 struct cx231xx *dev = snd_pcm_substream_chip(substream); 590 int retval = 0; 591 592 if (dev->state & DEV_DISCONNECTED) 593 return -ENODEV; 594 595 spin_lock(&dev->adev.slock); 596 switch (cmd) { 597 case SNDRV_PCM_TRIGGER_START: 598 atomic_set(&dev->stream_started, 1); 599 break; 600 case SNDRV_PCM_TRIGGER_STOP: 601 atomic_set(&dev->stream_started, 0); 602 break; 603 default: 604 retval = -EINVAL; 605 break; 606 } 607 spin_unlock(&dev->adev.slock); 608 609 schedule_work(&dev->wq_trigger); 610 611 return retval; 612 } 613 614 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream 615 *substream) 616 { 617 struct cx231xx *dev; 618 unsigned long flags; 619 snd_pcm_uframes_t hwptr_done; 620 621 dev = snd_pcm_substream_chip(substream); 622 623 spin_lock_irqsave(&dev->adev.slock, flags); 624 hwptr_done = dev->adev.hwptr_done_capture; 625 spin_unlock_irqrestore(&dev->adev.slock, flags); 626 627 return hwptr_done; 628 } 629 630 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 631 unsigned long offset) 632 { 633 void *pageptr = subs->runtime->dma_area + offset; 634 635 return vmalloc_to_page(pageptr); 636 } 637 638 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = { 639 .open = snd_cx231xx_capture_open, 640 .close = snd_cx231xx_pcm_close, 641 .ioctl = snd_pcm_lib_ioctl, 642 .hw_params = snd_cx231xx_hw_capture_params, 643 .hw_free = snd_cx231xx_hw_capture_free, 644 .prepare = snd_cx231xx_prepare, 645 .trigger = snd_cx231xx_capture_trigger, 646 .pointer = snd_cx231xx_capture_pointer, 647 .page = snd_pcm_get_vmalloc_page, 648 }; 649 650 static int cx231xx_audio_init(struct cx231xx *dev) 651 { 652 struct cx231xx_audio *adev = &dev->adev; 653 struct snd_pcm *pcm; 654 struct snd_card *card; 655 static int devnr; 656 int err; 657 struct usb_interface *uif; 658 int i, isoc_pipe = 0; 659 660 if (dev->has_alsa_audio != 1) { 661 /* This device does not support the extension (in this case 662 the device is expecting the snd-usb-audio module or 663 doesn't have analog audio support at all) */ 664 return 0; 665 } 666 667 dev_dbg(dev->dev, 668 "probing for cx231xx non standard usbaudio\n"); 669 670 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio", 671 THIS_MODULE, 0, &card); 672 if (err < 0) 673 return err; 674 675 spin_lock_init(&adev->slock); 676 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm); 677 if (err < 0) { 678 snd_card_free(card); 679 return err; 680 } 681 682 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 683 &snd_cx231xx_pcm_capture); 684 pcm->info_flags = 0; 685 pcm->private_data = dev; 686 strcpy(pcm->name, "Conexant cx231xx Capture"); 687 strcpy(card->driver, "Cx231xx-Audio"); 688 strcpy(card->shortname, "Cx231xx Audio"); 689 strcpy(card->longname, "Conexant cx231xx Audio"); 690 691 INIT_WORK(&dev->wq_trigger, audio_trigger); 692 693 err = snd_card_register(card); 694 if (err < 0) { 695 snd_card_free(card); 696 return err; 697 } 698 adev->sndcard = card; 699 adev->udev = dev->udev; 700 701 /* compute alternate max packet sizes for Audio */ 702 uif = 703 dev->udev->actconfig->interface[dev->current_pcb_config. 704 hs_config_info[0].interface_info. 705 audio_index + 1]; 706 707 adev->end_point_addr = 708 uif->altsetting[0].endpoint[isoc_pipe].desc. 709 bEndpointAddress; 710 711 adev->num_alt = uif->num_altsetting; 712 dev_info(dev->dev, 713 "audio EndPoint Addr 0x%x, Alternate settings: %i\n", 714 adev->end_point_addr, adev->num_alt); 715 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL); 716 717 if (adev->alt_max_pkt_size == NULL) 718 return -ENOMEM; 719 720 for (i = 0; i < adev->num_alt; i++) { 721 u16 tmp = 722 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc. 723 wMaxPacketSize); 724 adev->alt_max_pkt_size[i] = 725 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1); 726 dev_dbg(dev->dev, 727 "audio alternate setting %i, max size= %i\n", i, 728 adev->alt_max_pkt_size[i]); 729 } 730 731 return 0; 732 } 733 734 static int cx231xx_audio_fini(struct cx231xx *dev) 735 { 736 if (dev == NULL) 737 return 0; 738 739 if (dev->has_alsa_audio != 1) { 740 /* This device does not support the extension (in this case 741 the device is expecting the snd-usb-audio module or 742 doesn't have analog audio support at all) */ 743 return 0; 744 } 745 746 if (dev->adev.sndcard) { 747 snd_card_free(dev->adev.sndcard); 748 kfree(dev->adev.alt_max_pkt_size); 749 dev->adev.sndcard = NULL; 750 } 751 752 return 0; 753 } 754 755 static struct cx231xx_ops audio_ops = { 756 .id = CX231XX_AUDIO, 757 .name = "Cx231xx Audio Extension", 758 .init = cx231xx_audio_init, 759 .fini = cx231xx_audio_fini, 760 }; 761 762 static int __init cx231xx_alsa_register(void) 763 { 764 return cx231xx_register_extension(&audio_ops); 765 } 766 767 static void __exit cx231xx_alsa_unregister(void) 768 { 769 cx231xx_unregister_extension(&audio_ops); 770 } 771 772 MODULE_LICENSE("GPL"); 773 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 774 MODULE_DESCRIPTION("Cx231xx Audio driver"); 775 776 module_init(cx231xx_alsa_register); 777 module_exit(cx231xx_alsa_unregister); 778