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 19 #include "cx231xx.h" 20 #include <linux/kernel.h> 21 #include <linux/init.h> 22 #include <linux/sound.h> 23 #include <linux/spinlock.h> 24 #include <linux/soundcard.h> 25 #include <linux/slab.h> 26 #include <linux/vmalloc.h> 27 #include <linux/proc_fs.h> 28 #include <linux/module.h> 29 #include <sound/core.h> 30 #include <sound/pcm.h> 31 #include <sound/pcm_params.h> 32 #include <sound/info.h> 33 #include <sound/initval.h> 34 #include <sound/control.h> 35 #include <media/v4l2-common.h> 36 37 static int debug; 38 module_param(debug, int, 0644); 39 MODULE_PARM_DESC(debug, "activates debug info"); 40 41 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 42 43 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev) 44 { 45 int i; 46 47 dev_dbg(dev->dev, "Stopping isoc\n"); 48 49 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 50 if (dev->adev.urb[i]) { 51 if (!irqs_disabled()) 52 usb_kill_urb(dev->adev.urb[i]); 53 else 54 usb_unlink_urb(dev->adev.urb[i]); 55 56 usb_free_urb(dev->adev.urb[i]); 57 dev->adev.urb[i] = NULL; 58 59 kfree(dev->adev.transfer_buffer[i]); 60 dev->adev.transfer_buffer[i] = NULL; 61 } 62 } 63 64 return 0; 65 } 66 67 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev) 68 { 69 int i; 70 71 dev_dbg(dev->dev, "Stopping bulk\n"); 72 73 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 74 if (dev->adev.urb[i]) { 75 if (!irqs_disabled()) 76 usb_kill_urb(dev->adev.urb[i]); 77 else 78 usb_unlink_urb(dev->adev.urb[i]); 79 80 usb_free_urb(dev->adev.urb[i]); 81 dev->adev.urb[i] = NULL; 82 83 kfree(dev->adev.transfer_buffer[i]); 84 dev->adev.transfer_buffer[i] = NULL; 85 } 86 } 87 88 return 0; 89 } 90 91 static void cx231xx_audio_isocirq(struct urb *urb) 92 { 93 struct cx231xx *dev = urb->context; 94 int i; 95 unsigned int oldptr; 96 int period_elapsed = 0; 97 int status; 98 unsigned char *cp; 99 unsigned int stride; 100 struct snd_pcm_substream *substream; 101 struct snd_pcm_runtime *runtime; 102 103 if (dev->state & DEV_DISCONNECTED) 104 return; 105 106 switch (urb->status) { 107 case 0: /* success */ 108 case -ETIMEDOUT: /* NAK */ 109 break; 110 case -ECONNRESET: /* kill */ 111 case -ENOENT: 112 case -ESHUTDOWN: 113 return; 114 default: /* error */ 115 dev_dbg(dev->dev, "urb completition error %d.\n", 116 urb->status); 117 break; 118 } 119 120 if (atomic_read(&dev->stream_started) == 0) 121 return; 122 123 if (dev->adev.capture_pcm_substream) { 124 substream = dev->adev.capture_pcm_substream; 125 runtime = substream->runtime; 126 stride = runtime->frame_bits >> 3; 127 128 for (i = 0; i < urb->number_of_packets; i++) { 129 int length = urb->iso_frame_desc[i].actual_length / 130 stride; 131 cp = (unsigned char *)urb->transfer_buffer + 132 urb->iso_frame_desc[i].offset; 133 134 if (!length) 135 continue; 136 137 oldptr = dev->adev.hwptr_done_capture; 138 if (oldptr + length >= runtime->buffer_size) { 139 unsigned int cnt; 140 141 cnt = runtime->buffer_size - oldptr; 142 memcpy(runtime->dma_area + oldptr * stride, cp, 143 cnt * stride); 144 memcpy(runtime->dma_area, cp + cnt * stride, 145 length * stride - cnt * stride); 146 } else { 147 memcpy(runtime->dma_area + oldptr * stride, cp, 148 length * stride); 149 } 150 151 snd_pcm_stream_lock(substream); 152 153 dev->adev.hwptr_done_capture += length; 154 if (dev->adev.hwptr_done_capture >= 155 runtime->buffer_size) 156 dev->adev.hwptr_done_capture -= 157 runtime->buffer_size; 158 159 dev->adev.capture_transfer_done += length; 160 if (dev->adev.capture_transfer_done >= 161 runtime->period_size) { 162 dev->adev.capture_transfer_done -= 163 runtime->period_size; 164 period_elapsed = 1; 165 } 166 snd_pcm_stream_unlock(substream); 167 } 168 if (period_elapsed) 169 snd_pcm_period_elapsed(substream); 170 } 171 urb->status = 0; 172 173 status = usb_submit_urb(urb, GFP_ATOMIC); 174 if (status < 0) { 175 dev_err(dev->dev, 176 "resubmit of audio urb failed (error=%i)\n", 177 status); 178 } 179 return; 180 } 181 182 static void cx231xx_audio_bulkirq(struct urb *urb) 183 { 184 struct cx231xx *dev = urb->context; 185 unsigned int oldptr; 186 int period_elapsed = 0; 187 int status; 188 unsigned char *cp; 189 unsigned int stride; 190 struct snd_pcm_substream *substream; 191 struct snd_pcm_runtime *runtime; 192 193 if (dev->state & DEV_DISCONNECTED) 194 return; 195 196 switch (urb->status) { 197 case 0: /* success */ 198 case -ETIMEDOUT: /* NAK */ 199 break; 200 case -ECONNRESET: /* kill */ 201 case -ENOENT: 202 case -ESHUTDOWN: 203 return; 204 default: /* error */ 205 dev_dbg(dev->dev, "urb completition error %d.\n", 206 urb->status); 207 break; 208 } 209 210 if (atomic_read(&dev->stream_started) == 0) 211 return; 212 213 if (dev->adev.capture_pcm_substream) { 214 substream = dev->adev.capture_pcm_substream; 215 runtime = substream->runtime; 216 stride = runtime->frame_bits >> 3; 217 218 if (1) { 219 int length = urb->actual_length / 220 stride; 221 cp = (unsigned char *)urb->transfer_buffer; 222 223 oldptr = dev->adev.hwptr_done_capture; 224 if (oldptr + length >= runtime->buffer_size) { 225 unsigned int cnt; 226 227 cnt = runtime->buffer_size - oldptr; 228 memcpy(runtime->dma_area + oldptr * stride, cp, 229 cnt * stride); 230 memcpy(runtime->dma_area, cp + cnt * stride, 231 length * stride - cnt * stride); 232 } else { 233 memcpy(runtime->dma_area + oldptr * stride, cp, 234 length * stride); 235 } 236 237 snd_pcm_stream_lock(substream); 238 239 dev->adev.hwptr_done_capture += length; 240 if (dev->adev.hwptr_done_capture >= 241 runtime->buffer_size) 242 dev->adev.hwptr_done_capture -= 243 runtime->buffer_size; 244 245 dev->adev.capture_transfer_done += length; 246 if (dev->adev.capture_transfer_done >= 247 runtime->period_size) { 248 dev->adev.capture_transfer_done -= 249 runtime->period_size; 250 period_elapsed = 1; 251 } 252 snd_pcm_stream_unlock(substream); 253 } 254 if (period_elapsed) 255 snd_pcm_period_elapsed(substream); 256 } 257 urb->status = 0; 258 259 status = usb_submit_urb(urb, GFP_ATOMIC); 260 if (status < 0) { 261 dev_err(dev->dev, 262 "resubmit of audio urb failed (error=%i)\n", 263 status); 264 } 265 return; 266 } 267 268 static int cx231xx_init_audio_isoc(struct cx231xx *dev) 269 { 270 int i, errCode; 271 int sb_size; 272 273 dev_dbg(dev->dev, 274 "%s: Starting ISO AUDIO transfers\n", __func__); 275 276 if (dev->state & DEV_DISCONNECTED) 277 return -ENODEV; 278 279 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 280 281 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 282 struct urb *urb; 283 int j, k; 284 285 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 286 if (!dev->adev.transfer_buffer[i]) 287 return -ENOMEM; 288 289 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 290 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC); 291 if (!urb) { 292 for (j = 0; j < i; j++) { 293 usb_free_urb(dev->adev.urb[j]); 294 kfree(dev->adev.transfer_buffer[j]); 295 } 296 return -ENOMEM; 297 } 298 299 urb->dev = dev->udev; 300 urb->context = dev; 301 urb->pipe = usb_rcvisocpipe(dev->udev, 302 dev->adev.end_point_addr); 303 urb->transfer_flags = URB_ISO_ASAP; 304 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 305 urb->interval = 1; 306 urb->complete = cx231xx_audio_isocirq; 307 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS; 308 urb->transfer_buffer_length = sb_size; 309 310 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS; 311 j++, k += dev->adev.max_pkt_size) { 312 urb->iso_frame_desc[j].offset = k; 313 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size; 314 } 315 dev->adev.urb[i] = urb; 316 } 317 318 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 319 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 320 if (errCode < 0) { 321 cx231xx_isoc_audio_deinit(dev); 322 return errCode; 323 } 324 } 325 326 return errCode; 327 } 328 329 static int cx231xx_init_audio_bulk(struct cx231xx *dev) 330 { 331 int i, errCode; 332 int sb_size; 333 334 dev_dbg(dev->dev, 335 "%s: Starting BULK AUDIO transfers\n", __func__); 336 337 if (dev->state & DEV_DISCONNECTED) 338 return -ENODEV; 339 340 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 341 342 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 343 struct urb *urb; 344 int j; 345 346 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 347 if (!dev->adev.transfer_buffer[i]) 348 return -ENOMEM; 349 350 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 351 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 352 if (!urb) { 353 for (j = 0; j < i; j++) { 354 usb_free_urb(dev->adev.urb[j]); 355 kfree(dev->adev.transfer_buffer[j]); 356 } 357 return -ENOMEM; 358 } 359 360 urb->dev = dev->udev; 361 urb->context = dev; 362 urb->pipe = usb_rcvbulkpipe(dev->udev, 363 dev->adev.end_point_addr); 364 urb->transfer_flags = 0; 365 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 366 urb->complete = cx231xx_audio_bulkirq; 367 urb->transfer_buffer_length = sb_size; 368 369 dev->adev.urb[i] = urb; 370 371 } 372 373 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 374 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 375 if (errCode < 0) { 376 cx231xx_bulk_audio_deinit(dev); 377 return errCode; 378 } 379 } 380 381 return errCode; 382 } 383 384 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 385 size_t size) 386 { 387 struct snd_pcm_runtime *runtime = subs->runtime; 388 struct cx231xx *dev = snd_pcm_substream_chip(subs); 389 390 dev_dbg(dev->dev, "Allocating vbuffer\n"); 391 if (runtime->dma_area) { 392 if (runtime->dma_bytes > size) 393 return 0; 394 395 vfree(runtime->dma_area); 396 } 397 runtime->dma_area = vmalloc(size); 398 if (!runtime->dma_area) 399 return -ENOMEM; 400 401 runtime->dma_bytes = size; 402 403 return 0; 404 } 405 406 static const struct snd_pcm_hardware snd_cx231xx_hw_capture = { 407 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 408 SNDRV_PCM_INFO_MMAP | 409 SNDRV_PCM_INFO_INTERLEAVED | 410 SNDRV_PCM_INFO_MMAP_VALID, 411 412 .formats = SNDRV_PCM_FMTBIT_S16_LE, 413 414 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 415 416 .rate_min = 48000, 417 .rate_max = 48000, 418 .channels_min = 2, 419 .channels_max = 2, 420 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 421 .period_bytes_min = 64, /* 12544/2, */ 422 .period_bytes_max = 12544, 423 .periods_min = 2, 424 .periods_max = 98, /* 12544, */ 425 }; 426 427 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream) 428 { 429 struct cx231xx *dev = snd_pcm_substream_chip(substream); 430 struct snd_pcm_runtime *runtime = substream->runtime; 431 int ret = 0; 432 433 dev_dbg(dev->dev, 434 "opening device and trying to acquire exclusive lock\n"); 435 436 if (dev->state & DEV_DISCONNECTED) { 437 dev_err(dev->dev, 438 "Can't open. the device was removed.\n"); 439 return -ENODEV; 440 } 441 442 /* set alternate setting for audio interface */ 443 /* 1 - 48000 samples per sec */ 444 mutex_lock(&dev->lock); 445 if (dev->USE_ISO) 446 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 447 else 448 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 449 mutex_unlock(&dev->lock); 450 if (ret < 0) { 451 dev_err(dev->dev, 452 "failed to set alternate setting !\n"); 453 454 return ret; 455 } 456 457 runtime->hw = snd_cx231xx_hw_capture; 458 459 mutex_lock(&dev->lock); 460 /* inform hardware to start streaming */ 461 ret = cx231xx_capture_start(dev, 1, Audio); 462 463 dev->adev.users++; 464 mutex_unlock(&dev->lock); 465 466 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 467 dev->adev.capture_pcm_substream = substream; 468 runtime->private_data = dev; 469 470 return 0; 471 } 472 473 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 474 { 475 int ret; 476 struct cx231xx *dev = snd_pcm_substream_chip(substream); 477 478 dev_dbg(dev->dev, "closing device\n"); 479 480 /* inform hardware to stop streaming */ 481 mutex_lock(&dev->lock); 482 ret = cx231xx_capture_start(dev, 0, Audio); 483 484 /* set alternate setting for audio interface */ 485 /* 1 - 48000 samples per sec */ 486 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 487 if (ret < 0) { 488 dev_err(dev->dev, 489 "failed to set alternate setting !\n"); 490 491 mutex_unlock(&dev->lock); 492 return ret; 493 } 494 495 dev->adev.users--; 496 if (substream->runtime->dma_area) { 497 dev_dbg(dev->dev, "freeing\n"); 498 vfree(substream->runtime->dma_area); 499 substream->runtime->dma_area = NULL; 500 } 501 mutex_unlock(&dev->lock); 502 503 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 504 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users); 505 dev_dbg(dev->dev, "disabling audio stream!\n"); 506 dev->adev.shutdown = 0; 507 dev_dbg(dev->dev, "released lock\n"); 508 if (atomic_read(&dev->stream_started) > 0) { 509 atomic_set(&dev->stream_started, 0); 510 schedule_work(&dev->wq_trigger); 511 } 512 } 513 return 0; 514 } 515 516 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 517 struct snd_pcm_hw_params *hw_params) 518 { 519 struct cx231xx *dev = snd_pcm_substream_chip(substream); 520 int ret; 521 522 dev_dbg(dev->dev, "Setting capture parameters\n"); 523 524 ret = snd_pcm_alloc_vmalloc_buffer(substream, 525 params_buffer_bytes(hw_params)); 526 #if 0 527 /* TODO: set up cx231xx audio chip to deliver the correct audio format, 528 current default is 48000hz multiplexed => 96000hz mono 529 which shouldn't matter since analogue TV only supports mono */ 530 unsigned int channels, rate, format; 531 532 format = params_format(hw_params); 533 rate = params_rate(hw_params); 534 channels = params_channels(hw_params); 535 #endif 536 537 return ret; 538 } 539 540 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream) 541 { 542 struct cx231xx *dev = snd_pcm_substream_chip(substream); 543 544 dev_dbg(dev->dev, "Stop capture, if needed\n"); 545 546 if (atomic_read(&dev->stream_started) > 0) { 547 atomic_set(&dev->stream_started, 0); 548 schedule_work(&dev->wq_trigger); 549 } 550 551 return 0; 552 } 553 554 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream) 555 { 556 struct cx231xx *dev = snd_pcm_substream_chip(substream); 557 558 dev->adev.hwptr_done_capture = 0; 559 dev->adev.capture_transfer_done = 0; 560 561 return 0; 562 } 563 564 static void audio_trigger(struct work_struct *work) 565 { 566 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger); 567 568 if (atomic_read(&dev->stream_started)) { 569 dev_dbg(dev->dev, "starting capture"); 570 if (is_fw_load(dev) == 0) 571 cx25840_call(dev, core, load_fw); 572 if (dev->USE_ISO) 573 cx231xx_init_audio_isoc(dev); 574 else 575 cx231xx_init_audio_bulk(dev); 576 } else { 577 dev_dbg(dev->dev, "stopping capture"); 578 cx231xx_isoc_audio_deinit(dev); 579 } 580 } 581 582 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream, 583 int cmd) 584 { 585 struct cx231xx *dev = snd_pcm_substream_chip(substream); 586 int retval = 0; 587 588 if (dev->state & DEV_DISCONNECTED) 589 return -ENODEV; 590 591 spin_lock(&dev->adev.slock); 592 switch (cmd) { 593 case SNDRV_PCM_TRIGGER_START: 594 atomic_set(&dev->stream_started, 1); 595 break; 596 case SNDRV_PCM_TRIGGER_STOP: 597 atomic_set(&dev->stream_started, 0); 598 break; 599 default: 600 retval = -EINVAL; 601 break; 602 } 603 spin_unlock(&dev->adev.slock); 604 605 schedule_work(&dev->wq_trigger); 606 607 return retval; 608 } 609 610 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream 611 *substream) 612 { 613 struct cx231xx *dev; 614 unsigned long flags; 615 snd_pcm_uframes_t hwptr_done; 616 617 dev = snd_pcm_substream_chip(substream); 618 619 spin_lock_irqsave(&dev->adev.slock, flags); 620 hwptr_done = dev->adev.hwptr_done_capture; 621 spin_unlock_irqrestore(&dev->adev.slock, flags); 622 623 return hwptr_done; 624 } 625 626 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 627 unsigned long offset) 628 { 629 void *pageptr = subs->runtime->dma_area + offset; 630 631 return vmalloc_to_page(pageptr); 632 } 633 634 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = { 635 .open = snd_cx231xx_capture_open, 636 .close = snd_cx231xx_pcm_close, 637 .ioctl = snd_pcm_lib_ioctl, 638 .hw_params = snd_cx231xx_hw_capture_params, 639 .hw_free = snd_cx231xx_hw_capture_free, 640 .prepare = snd_cx231xx_prepare, 641 .trigger = snd_cx231xx_capture_trigger, 642 .pointer = snd_cx231xx_capture_pointer, 643 .page = snd_pcm_get_vmalloc_page, 644 }; 645 646 static int cx231xx_audio_init(struct cx231xx *dev) 647 { 648 struct cx231xx_audio *adev = &dev->adev; 649 struct snd_pcm *pcm; 650 struct snd_card *card; 651 static int devnr; 652 int err; 653 struct usb_interface *uif; 654 int i, isoc_pipe = 0; 655 656 if (dev->has_alsa_audio != 1) { 657 /* This device does not support the extension (in this case 658 the device is expecting the snd-usb-audio module or 659 doesn't have analog audio support at all) */ 660 return 0; 661 } 662 663 dev_dbg(dev->dev, 664 "probing for cx231xx non standard usbaudio\n"); 665 666 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio", 667 THIS_MODULE, 0, &card); 668 if (err < 0) 669 return err; 670 671 spin_lock_init(&adev->slock); 672 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm); 673 if (err < 0) 674 goto err_free_card; 675 676 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 677 &snd_cx231xx_pcm_capture); 678 pcm->info_flags = 0; 679 pcm->private_data = dev; 680 strcpy(pcm->name, "Conexant cx231xx Capture"); 681 strcpy(card->driver, "Cx231xx-Audio"); 682 strcpy(card->shortname, "Cx231xx Audio"); 683 strcpy(card->longname, "Conexant cx231xx Audio"); 684 685 INIT_WORK(&dev->wq_trigger, audio_trigger); 686 687 err = snd_card_register(card); 688 if (err < 0) 689 goto err_free_card; 690 691 adev->sndcard = card; 692 adev->udev = dev->udev; 693 694 /* compute alternate max packet sizes for Audio */ 695 uif = 696 dev->udev->actconfig->interface[dev->current_pcb_config. 697 hs_config_info[0].interface_info. 698 audio_index + 1]; 699 700 if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) { 701 err = -ENODEV; 702 goto err_free_card; 703 } 704 705 adev->end_point_addr = 706 uif->altsetting[0].endpoint[isoc_pipe].desc. 707 bEndpointAddress; 708 709 adev->num_alt = uif->num_altsetting; 710 dev_info(dev->dev, 711 "audio EndPoint Addr 0x%x, Alternate settings: %i\n", 712 adev->end_point_addr, adev->num_alt); 713 adev->alt_max_pkt_size = kmalloc_array(32, adev->num_alt, GFP_KERNEL); 714 if (!adev->alt_max_pkt_size) { 715 err = -ENOMEM; 716 goto err_free_card; 717 } 718 719 for (i = 0; i < adev->num_alt; i++) { 720 u16 tmp; 721 722 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) { 723 err = -ENODEV; 724 goto err_free_pkt_size; 725 } 726 727 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc. 728 wMaxPacketSize); 729 adev->alt_max_pkt_size[i] = 730 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1); 731 dev_dbg(dev->dev, 732 "audio alternate setting %i, max size= %i\n", i, 733 adev->alt_max_pkt_size[i]); 734 } 735 736 return 0; 737 738 err_free_pkt_size: 739 kfree(adev->alt_max_pkt_size); 740 err_free_card: 741 snd_card_free(card); 742 743 return err; 744 } 745 746 static int cx231xx_audio_fini(struct cx231xx *dev) 747 { 748 if (dev == NULL) 749 return 0; 750 751 if (dev->has_alsa_audio != 1) { 752 /* This device does not support the extension (in this case 753 the device is expecting the snd-usb-audio module or 754 doesn't have analog audio support at all) */ 755 return 0; 756 } 757 758 if (dev->adev.sndcard) { 759 snd_card_free(dev->adev.sndcard); 760 kfree(dev->adev.alt_max_pkt_size); 761 dev->adev.sndcard = NULL; 762 } 763 764 return 0; 765 } 766 767 static struct cx231xx_ops audio_ops = { 768 .id = CX231XX_AUDIO, 769 .name = "Cx231xx Audio Extension", 770 .init = cx231xx_audio_init, 771 .fini = cx231xx_audio_fini, 772 }; 773 774 static int __init cx231xx_alsa_register(void) 775 { 776 return cx231xx_register_extension(&audio_ops); 777 } 778 779 static void __exit cx231xx_alsa_unregister(void) 780 { 781 cx231xx_unregister_extension(&audio_ops); 782 } 783 784 MODULE_LICENSE("GPL"); 785 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 786 MODULE_DESCRIPTION("Cx231xx Audio driver"); 787 788 module_init(cx231xx_alsa_register); 789 module_exit(cx231xx_alsa_unregister); 790