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 completion 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 unsigned long flags; 130 int length = urb->iso_frame_desc[i].actual_length / 131 stride; 132 cp = (unsigned char *)urb->transfer_buffer + 133 urb->iso_frame_desc[i].offset; 134 135 if (!length) 136 continue; 137 138 oldptr = dev->adev.hwptr_done_capture; 139 if (oldptr + length >= runtime->buffer_size) { 140 unsigned int cnt; 141 142 cnt = runtime->buffer_size - oldptr; 143 memcpy(runtime->dma_area + oldptr * stride, cp, 144 cnt * stride); 145 memcpy(runtime->dma_area, cp + cnt * stride, 146 length * stride - cnt * stride); 147 } else { 148 memcpy(runtime->dma_area + oldptr * stride, cp, 149 length * stride); 150 } 151 152 snd_pcm_stream_lock_irqsave(substream, flags); 153 154 dev->adev.hwptr_done_capture += length; 155 if (dev->adev.hwptr_done_capture >= 156 runtime->buffer_size) 157 dev->adev.hwptr_done_capture -= 158 runtime->buffer_size; 159 160 dev->adev.capture_transfer_done += length; 161 if (dev->adev.capture_transfer_done >= 162 runtime->period_size) { 163 dev->adev.capture_transfer_done -= 164 runtime->period_size; 165 period_elapsed = 1; 166 } 167 snd_pcm_stream_unlock_irqrestore(substream, flags); 168 } 169 if (period_elapsed) 170 snd_pcm_period_elapsed(substream); 171 } 172 urb->status = 0; 173 174 status = usb_submit_urb(urb, GFP_ATOMIC); 175 if (status < 0) { 176 dev_err(dev->dev, 177 "resubmit of audio urb failed (error=%i)\n", 178 status); 179 } 180 return; 181 } 182 183 static void cx231xx_audio_bulkirq(struct urb *urb) 184 { 185 struct cx231xx *dev = urb->context; 186 unsigned int oldptr; 187 int period_elapsed = 0; 188 int status; 189 unsigned char *cp; 190 unsigned int stride; 191 struct snd_pcm_substream *substream; 192 struct snd_pcm_runtime *runtime; 193 194 if (dev->state & DEV_DISCONNECTED) 195 return; 196 197 switch (urb->status) { 198 case 0: /* success */ 199 case -ETIMEDOUT: /* NAK */ 200 break; 201 case -ECONNRESET: /* kill */ 202 case -ENOENT: 203 case -ESHUTDOWN: 204 return; 205 default: /* error */ 206 dev_dbg(dev->dev, "urb completion error %d.\n", 207 urb->status); 208 break; 209 } 210 211 if (atomic_read(&dev->stream_started) == 0) 212 return; 213 214 if (dev->adev.capture_pcm_substream) { 215 substream = dev->adev.capture_pcm_substream; 216 runtime = substream->runtime; 217 stride = runtime->frame_bits >> 3; 218 219 if (1) { 220 unsigned long flags; 221 int length = urb->actual_length / 222 stride; 223 cp = (unsigned char *)urb->transfer_buffer; 224 225 oldptr = dev->adev.hwptr_done_capture; 226 if (oldptr + length >= runtime->buffer_size) { 227 unsigned int cnt; 228 229 cnt = runtime->buffer_size - oldptr; 230 memcpy(runtime->dma_area + oldptr * stride, cp, 231 cnt * stride); 232 memcpy(runtime->dma_area, cp + cnt * stride, 233 length * stride - cnt * stride); 234 } else { 235 memcpy(runtime->dma_area + oldptr * stride, cp, 236 length * stride); 237 } 238 239 snd_pcm_stream_lock_irqsave(substream, flags); 240 241 dev->adev.hwptr_done_capture += length; 242 if (dev->adev.hwptr_done_capture >= 243 runtime->buffer_size) 244 dev->adev.hwptr_done_capture -= 245 runtime->buffer_size; 246 247 dev->adev.capture_transfer_done += length; 248 if (dev->adev.capture_transfer_done >= 249 runtime->period_size) { 250 dev->adev.capture_transfer_done -= 251 runtime->period_size; 252 period_elapsed = 1; 253 } 254 snd_pcm_stream_unlock_irqrestore(substream, flags); 255 } 256 if (period_elapsed) 257 snd_pcm_period_elapsed(substream); 258 } 259 urb->status = 0; 260 261 status = usb_submit_urb(urb, GFP_ATOMIC); 262 if (status < 0) { 263 dev_err(dev->dev, 264 "resubmit of audio urb failed (error=%i)\n", 265 status); 266 } 267 return; 268 } 269 270 static int cx231xx_init_audio_isoc(struct cx231xx *dev) 271 { 272 int i, errCode; 273 int sb_size; 274 275 dev_dbg(dev->dev, 276 "%s: Starting ISO AUDIO transfers\n", __func__); 277 278 if (dev->state & DEV_DISCONNECTED) 279 return -ENODEV; 280 281 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 282 283 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 284 struct urb *urb; 285 int j, k; 286 287 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 288 if (!dev->adev.transfer_buffer[i]) 289 return -ENOMEM; 290 291 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 292 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC); 293 if (!urb) { 294 for (j = 0; j < i; j++) { 295 usb_free_urb(dev->adev.urb[j]); 296 kfree(dev->adev.transfer_buffer[j]); 297 } 298 return -ENOMEM; 299 } 300 301 urb->dev = dev->udev; 302 urb->context = dev; 303 urb->pipe = usb_rcvisocpipe(dev->udev, 304 dev->adev.end_point_addr); 305 urb->transfer_flags = URB_ISO_ASAP; 306 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 307 urb->interval = 1; 308 urb->complete = cx231xx_audio_isocirq; 309 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS; 310 urb->transfer_buffer_length = sb_size; 311 312 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS; 313 j++, k += dev->adev.max_pkt_size) { 314 urb->iso_frame_desc[j].offset = k; 315 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size; 316 } 317 dev->adev.urb[i] = urb; 318 } 319 320 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 321 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 322 if (errCode < 0) { 323 cx231xx_isoc_audio_deinit(dev); 324 return errCode; 325 } 326 } 327 328 return errCode; 329 } 330 331 static int cx231xx_init_audio_bulk(struct cx231xx *dev) 332 { 333 int i, errCode; 334 int sb_size; 335 336 dev_dbg(dev->dev, 337 "%s: Starting BULK AUDIO transfers\n", __func__); 338 339 if (dev->state & DEV_DISCONNECTED) 340 return -ENODEV; 341 342 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 343 344 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 345 struct urb *urb; 346 int j; 347 348 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 349 if (!dev->adev.transfer_buffer[i]) 350 return -ENOMEM; 351 352 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 353 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 354 if (!urb) { 355 for (j = 0; j < i; j++) { 356 usb_free_urb(dev->adev.urb[j]); 357 kfree(dev->adev.transfer_buffer[j]); 358 } 359 return -ENOMEM; 360 } 361 362 urb->dev = dev->udev; 363 urb->context = dev; 364 urb->pipe = usb_rcvbulkpipe(dev->udev, 365 dev->adev.end_point_addr); 366 urb->transfer_flags = 0; 367 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 368 urb->complete = cx231xx_audio_bulkirq; 369 urb->transfer_buffer_length = sb_size; 370 371 dev->adev.urb[i] = urb; 372 373 } 374 375 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 376 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 377 if (errCode < 0) { 378 cx231xx_bulk_audio_deinit(dev); 379 return errCode; 380 } 381 } 382 383 return errCode; 384 } 385 386 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 387 size_t size) 388 { 389 struct snd_pcm_runtime *runtime = subs->runtime; 390 struct cx231xx *dev = snd_pcm_substream_chip(subs); 391 392 dev_dbg(dev->dev, "Allocating vbuffer\n"); 393 if (runtime->dma_area) { 394 if (runtime->dma_bytes > size) 395 return 0; 396 397 vfree(runtime->dma_area); 398 } 399 runtime->dma_area = vmalloc(size); 400 if (!runtime->dma_area) 401 return -ENOMEM; 402 403 runtime->dma_bytes = size; 404 405 return 0; 406 } 407 408 static const struct snd_pcm_hardware snd_cx231xx_hw_capture = { 409 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 410 SNDRV_PCM_INFO_MMAP | 411 SNDRV_PCM_INFO_INTERLEAVED | 412 SNDRV_PCM_INFO_MMAP_VALID, 413 414 .formats = SNDRV_PCM_FMTBIT_S16_LE, 415 416 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, 417 418 .rate_min = 48000, 419 .rate_max = 48000, 420 .channels_min = 2, 421 .channels_max = 2, 422 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 423 .period_bytes_min = 64, /* 12544/2, */ 424 .period_bytes_max = 12544, 425 .periods_min = 2, 426 .periods_max = 98, /* 12544, */ 427 }; 428 429 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream) 430 { 431 struct cx231xx *dev = snd_pcm_substream_chip(substream); 432 struct snd_pcm_runtime *runtime = substream->runtime; 433 int ret = 0; 434 435 dev_dbg(dev->dev, 436 "opening device and trying to acquire exclusive lock\n"); 437 438 if (dev->state & DEV_DISCONNECTED) { 439 dev_err(dev->dev, 440 "Can't open. the device was removed.\n"); 441 return -ENODEV; 442 } 443 444 /* set alternate setting for audio interface */ 445 /* 1 - 48000 samples per sec */ 446 mutex_lock(&dev->lock); 447 if (dev->USE_ISO) 448 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 449 else 450 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 451 mutex_unlock(&dev->lock); 452 if (ret < 0) { 453 dev_err(dev->dev, 454 "failed to set alternate setting !\n"); 455 456 return ret; 457 } 458 459 runtime->hw = snd_cx231xx_hw_capture; 460 461 mutex_lock(&dev->lock); 462 /* inform hardware to start streaming */ 463 ret = cx231xx_capture_start(dev, 1, Audio); 464 465 dev->adev.users++; 466 mutex_unlock(&dev->lock); 467 468 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 469 dev->adev.capture_pcm_substream = substream; 470 runtime->private_data = dev; 471 472 return 0; 473 } 474 475 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 476 { 477 int ret; 478 struct cx231xx *dev = snd_pcm_substream_chip(substream); 479 480 dev_dbg(dev->dev, "closing device\n"); 481 482 /* inform hardware to stop streaming */ 483 mutex_lock(&dev->lock); 484 ret = cx231xx_capture_start(dev, 0, Audio); 485 486 /* set alternate setting for audio interface */ 487 /* 1 - 48000 samples per sec */ 488 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 489 if (ret < 0) { 490 dev_err(dev->dev, 491 "failed to set alternate setting !\n"); 492 493 mutex_unlock(&dev->lock); 494 return ret; 495 } 496 497 dev->adev.users--; 498 if (substream->runtime->dma_area) { 499 dev_dbg(dev->dev, "freeing\n"); 500 vfree(substream->runtime->dma_area); 501 substream->runtime->dma_area = NULL; 502 } 503 mutex_unlock(&dev->lock); 504 505 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 506 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users); 507 dev_dbg(dev->dev, "disabling audio stream!\n"); 508 dev->adev.shutdown = 0; 509 dev_dbg(dev->dev, "released lock\n"); 510 if (atomic_read(&dev->stream_started) > 0) { 511 atomic_set(&dev->stream_started, 0); 512 schedule_work(&dev->wq_trigger); 513 } 514 } 515 return 0; 516 } 517 518 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 519 struct snd_pcm_hw_params *hw_params) 520 { 521 struct cx231xx *dev = snd_pcm_substream_chip(substream); 522 int ret; 523 524 dev_dbg(dev->dev, "Setting capture parameters\n"); 525 526 ret = snd_pcm_alloc_vmalloc_buffer(substream, 527 params_buffer_bytes(hw_params)); 528 #if 0 529 /* TODO: set up cx231xx audio chip to deliver the correct audio format, 530 current default is 48000hz multiplexed => 96000hz mono 531 which shouldn't matter since analogue TV only supports mono */ 532 unsigned int channels, rate, format; 533 534 format = params_format(hw_params); 535 rate = params_rate(hw_params); 536 channels = params_channels(hw_params); 537 #endif 538 539 return ret; 540 } 541 542 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream) 543 { 544 struct cx231xx *dev = snd_pcm_substream_chip(substream); 545 546 dev_dbg(dev->dev, "Stop capture, if needed\n"); 547 548 if (atomic_read(&dev->stream_started) > 0) { 549 atomic_set(&dev->stream_started, 0); 550 schedule_work(&dev->wq_trigger); 551 } 552 553 return 0; 554 } 555 556 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream) 557 { 558 struct cx231xx *dev = snd_pcm_substream_chip(substream); 559 560 dev->adev.hwptr_done_capture = 0; 561 dev->adev.capture_transfer_done = 0; 562 563 return 0; 564 } 565 566 static void audio_trigger(struct work_struct *work) 567 { 568 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger); 569 570 if (atomic_read(&dev->stream_started)) { 571 dev_dbg(dev->dev, "starting capture"); 572 if (is_fw_load(dev) == 0) 573 cx25840_call(dev, core, load_fw); 574 if (dev->USE_ISO) 575 cx231xx_init_audio_isoc(dev); 576 else 577 cx231xx_init_audio_bulk(dev); 578 } else { 579 dev_dbg(dev->dev, "stopping capture"); 580 cx231xx_isoc_audio_deinit(dev); 581 } 582 } 583 584 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream, 585 int cmd) 586 { 587 struct cx231xx *dev = snd_pcm_substream_chip(substream); 588 int retval = 0; 589 590 if (dev->state & DEV_DISCONNECTED) 591 return -ENODEV; 592 593 spin_lock(&dev->adev.slock); 594 switch (cmd) { 595 case SNDRV_PCM_TRIGGER_START: 596 atomic_set(&dev->stream_started, 1); 597 break; 598 case SNDRV_PCM_TRIGGER_STOP: 599 atomic_set(&dev->stream_started, 0); 600 break; 601 default: 602 retval = -EINVAL; 603 break; 604 } 605 spin_unlock(&dev->adev.slock); 606 607 schedule_work(&dev->wq_trigger); 608 609 return retval; 610 } 611 612 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream 613 *substream) 614 { 615 struct cx231xx *dev; 616 unsigned long flags; 617 snd_pcm_uframes_t hwptr_done; 618 619 dev = snd_pcm_substream_chip(substream); 620 621 spin_lock_irqsave(&dev->adev.slock, flags); 622 hwptr_done = dev->adev.hwptr_done_capture; 623 spin_unlock_irqrestore(&dev->adev.slock, flags); 624 625 return hwptr_done; 626 } 627 628 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 629 unsigned long offset) 630 { 631 void *pageptr = subs->runtime->dma_area + offset; 632 633 return vmalloc_to_page(pageptr); 634 } 635 636 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = { 637 .open = snd_cx231xx_capture_open, 638 .close = snd_cx231xx_pcm_close, 639 .ioctl = snd_pcm_lib_ioctl, 640 .hw_params = snd_cx231xx_hw_capture_params, 641 .hw_free = snd_cx231xx_hw_capture_free, 642 .prepare = snd_cx231xx_prepare, 643 .trigger = snd_cx231xx_capture_trigger, 644 .pointer = snd_cx231xx_capture_pointer, 645 .page = snd_pcm_get_vmalloc_page, 646 }; 647 648 static int cx231xx_audio_init(struct cx231xx *dev) 649 { 650 struct cx231xx_audio *adev = &dev->adev; 651 struct snd_pcm *pcm; 652 struct snd_card *card; 653 static int devnr; 654 int err; 655 struct usb_interface *uif; 656 int i, isoc_pipe = 0; 657 658 if (dev->has_alsa_audio != 1) { 659 /* This device does not support the extension (in this case 660 the device is expecting the snd-usb-audio module or 661 doesn't have analog audio support at all) */ 662 return 0; 663 } 664 665 dev_dbg(dev->dev, 666 "probing for cx231xx non standard usbaudio\n"); 667 668 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio", 669 THIS_MODULE, 0, &card); 670 if (err < 0) 671 return err; 672 673 spin_lock_init(&adev->slock); 674 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm); 675 if (err < 0) 676 goto err_free_card; 677 678 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 679 &snd_cx231xx_pcm_capture); 680 pcm->info_flags = 0; 681 pcm->private_data = dev; 682 strscpy(pcm->name, "Conexant cx231xx Capture", sizeof(pcm->name)); 683 strscpy(card->driver, "Cx231xx-Audio", sizeof(card->driver)); 684 strscpy(card->shortname, "Cx231xx Audio", sizeof(card->shortname)); 685 strscpy(card->longname, "Conexant cx231xx Audio", sizeof(card->longname)); 686 687 INIT_WORK(&dev->wq_trigger, audio_trigger); 688 689 err = snd_card_register(card); 690 if (err < 0) 691 goto err_free_card; 692 693 adev->sndcard = card; 694 adev->udev = dev->udev; 695 696 /* compute alternate max packet sizes for Audio */ 697 uif = 698 dev->udev->actconfig->interface[dev->current_pcb_config. 699 hs_config_info[0].interface_info. 700 audio_index + 1]; 701 702 if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) { 703 err = -ENODEV; 704 goto err_free_card; 705 } 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_array(32, adev->num_alt, GFP_KERNEL); 716 if (!adev->alt_max_pkt_size) { 717 err = -ENOMEM; 718 goto err_free_card; 719 } 720 721 for (i = 0; i < adev->num_alt; i++) { 722 u16 tmp; 723 724 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) { 725 err = -ENODEV; 726 goto err_free_pkt_size; 727 } 728 729 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc. 730 wMaxPacketSize); 731 adev->alt_max_pkt_size[i] = 732 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1); 733 dev_dbg(dev->dev, 734 "audio alternate setting %i, max size= %i\n", i, 735 adev->alt_max_pkt_size[i]); 736 } 737 738 return 0; 739 740 err_free_pkt_size: 741 kfree(adev->alt_max_pkt_size); 742 err_free_card: 743 snd_card_free(card); 744 745 return err; 746 } 747 748 static int cx231xx_audio_fini(struct cx231xx *dev) 749 { 750 if (dev == NULL) 751 return 0; 752 753 if (dev->has_alsa_audio != 1) { 754 /* This device does not support the extension (in this case 755 the device is expecting the snd-usb-audio module or 756 doesn't have analog audio support at all) */ 757 return 0; 758 } 759 760 if (dev->adev.sndcard) { 761 snd_card_free(dev->adev.sndcard); 762 kfree(dev->adev.alt_max_pkt_size); 763 dev->adev.sndcard = NULL; 764 } 765 766 return 0; 767 } 768 769 static struct cx231xx_ops audio_ops = { 770 .id = CX231XX_AUDIO, 771 .name = "Cx231xx Audio Extension", 772 .init = cx231xx_audio_init, 773 .fini = cx231xx_audio_fini, 774 }; 775 776 static int __init cx231xx_alsa_register(void) 777 { 778 return cx231xx_register_extension(&audio_ops); 779 } 780 781 static void __exit cx231xx_alsa_unregister(void) 782 { 783 cx231xx_unregister_extension(&audio_ops); 784 } 785 786 MODULE_LICENSE("GPL"); 787 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 788 MODULE_DESCRIPTION("Cx231xx Audio driver"); 789 790 module_init(cx231xx_alsa_register); 791 module_exit(cx231xx_alsa_unregister); 792