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 <linux/kernel.h> 24 #include <linux/usb.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 #include "cx231xx.h" 41 42 static int debug; 43 module_param(debug, int, 0644); 44 MODULE_PARM_DESC(debug, "activates debug info"); 45 46 #define dprintk(fmt, arg...) do { \ 47 if (debug) \ 48 printk(KERN_INFO "cx231xx-audio %s: " fmt, \ 49 __func__, ##arg); \ 50 } while (0) 51 52 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 53 54 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev) 55 { 56 int i; 57 58 dprintk("Stopping isoc\n"); 59 60 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 61 if (dev->adev.urb[i]) { 62 if (!irqs_disabled()) 63 usb_kill_urb(dev->adev.urb[i]); 64 else 65 usb_unlink_urb(dev->adev.urb[i]); 66 67 usb_free_urb(dev->adev.urb[i]); 68 dev->adev.urb[i] = NULL; 69 70 kfree(dev->adev.transfer_buffer[i]); 71 dev->adev.transfer_buffer[i] = NULL; 72 } 73 } 74 75 return 0; 76 } 77 78 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev) 79 { 80 int i; 81 82 dprintk("Stopping bulk\n"); 83 84 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 85 if (dev->adev.urb[i]) { 86 if (!irqs_disabled()) 87 usb_kill_urb(dev->adev.urb[i]); 88 else 89 usb_unlink_urb(dev->adev.urb[i]); 90 91 usb_free_urb(dev->adev.urb[i]); 92 dev->adev.urb[i] = NULL; 93 94 kfree(dev->adev.transfer_buffer[i]); 95 dev->adev.transfer_buffer[i] = NULL; 96 } 97 } 98 99 return 0; 100 } 101 102 static void cx231xx_audio_isocirq(struct urb *urb) 103 { 104 struct cx231xx *dev = urb->context; 105 int i; 106 unsigned int oldptr; 107 int period_elapsed = 0; 108 int status; 109 unsigned char *cp; 110 unsigned int stride; 111 struct snd_pcm_substream *substream; 112 struct snd_pcm_runtime *runtime; 113 114 if (dev->state & DEV_DISCONNECTED) 115 return; 116 117 switch (urb->status) { 118 case 0: /* success */ 119 case -ETIMEDOUT: /* NAK */ 120 break; 121 case -ECONNRESET: /* kill */ 122 case -ENOENT: 123 case -ESHUTDOWN: 124 return; 125 default: /* error */ 126 dprintk("urb completition error %d.\n", urb->status); 127 break; 128 } 129 130 if (atomic_read(&dev->stream_started) == 0) 131 return; 132 133 if (dev->adev.capture_pcm_substream) { 134 substream = dev->adev.capture_pcm_substream; 135 runtime = substream->runtime; 136 stride = runtime->frame_bits >> 3; 137 138 for (i = 0; i < urb->number_of_packets; i++) { 139 int length = urb->iso_frame_desc[i].actual_length / 140 stride; 141 cp = (unsigned char *)urb->transfer_buffer + 142 urb->iso_frame_desc[i].offset; 143 144 if (!length) 145 continue; 146 147 oldptr = dev->adev.hwptr_done_capture; 148 if (oldptr + length >= runtime->buffer_size) { 149 unsigned int cnt; 150 151 cnt = runtime->buffer_size - oldptr; 152 memcpy(runtime->dma_area + oldptr * stride, cp, 153 cnt * stride); 154 memcpy(runtime->dma_area, cp + cnt * stride, 155 length * stride - cnt * stride); 156 } else { 157 memcpy(runtime->dma_area + oldptr * stride, cp, 158 length * stride); 159 } 160 161 snd_pcm_stream_lock(substream); 162 163 dev->adev.hwptr_done_capture += length; 164 if (dev->adev.hwptr_done_capture >= 165 runtime->buffer_size) 166 dev->adev.hwptr_done_capture -= 167 runtime->buffer_size; 168 169 dev->adev.capture_transfer_done += length; 170 if (dev->adev.capture_transfer_done >= 171 runtime->period_size) { 172 dev->adev.capture_transfer_done -= 173 runtime->period_size; 174 period_elapsed = 1; 175 } 176 snd_pcm_stream_unlock(substream); 177 } 178 if (period_elapsed) 179 snd_pcm_period_elapsed(substream); 180 } 181 urb->status = 0; 182 183 status = usb_submit_urb(urb, GFP_ATOMIC); 184 if (status < 0) { 185 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n", 186 status); 187 } 188 return; 189 } 190 191 static void cx231xx_audio_bulkirq(struct urb *urb) 192 { 193 struct cx231xx *dev = urb->context; 194 unsigned int oldptr; 195 int period_elapsed = 0; 196 int status; 197 unsigned char *cp; 198 unsigned int stride; 199 struct snd_pcm_substream *substream; 200 struct snd_pcm_runtime *runtime; 201 202 if (dev->state & DEV_DISCONNECTED) 203 return; 204 205 switch (urb->status) { 206 case 0: /* success */ 207 case -ETIMEDOUT: /* NAK */ 208 break; 209 case -ECONNRESET: /* kill */ 210 case -ENOENT: 211 case -ESHUTDOWN: 212 return; 213 default: /* error */ 214 dprintk("urb completition error %d.\n", urb->status); 215 break; 216 } 217 218 if (atomic_read(&dev->stream_started) == 0) 219 return; 220 221 if (dev->adev.capture_pcm_substream) { 222 substream = dev->adev.capture_pcm_substream; 223 runtime = substream->runtime; 224 stride = runtime->frame_bits >> 3; 225 226 if (1) { 227 int length = urb->actual_length / 228 stride; 229 cp = (unsigned char *)urb->transfer_buffer; 230 231 oldptr = dev->adev.hwptr_done_capture; 232 if (oldptr + length >= runtime->buffer_size) { 233 unsigned int cnt; 234 235 cnt = runtime->buffer_size - oldptr; 236 memcpy(runtime->dma_area + oldptr * stride, cp, 237 cnt * stride); 238 memcpy(runtime->dma_area, cp + cnt * stride, 239 length * stride - cnt * stride); 240 } else { 241 memcpy(runtime->dma_area + oldptr * stride, cp, 242 length * stride); 243 } 244 245 snd_pcm_stream_lock(substream); 246 247 dev->adev.hwptr_done_capture += length; 248 if (dev->adev.hwptr_done_capture >= 249 runtime->buffer_size) 250 dev->adev.hwptr_done_capture -= 251 runtime->buffer_size; 252 253 dev->adev.capture_transfer_done += length; 254 if (dev->adev.capture_transfer_done >= 255 runtime->period_size) { 256 dev->adev.capture_transfer_done -= 257 runtime->period_size; 258 period_elapsed = 1; 259 } 260 snd_pcm_stream_unlock(substream); 261 } 262 if (period_elapsed) 263 snd_pcm_period_elapsed(substream); 264 } 265 urb->status = 0; 266 267 status = usb_submit_urb(urb, GFP_ATOMIC); 268 if (status < 0) { 269 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n", 270 status); 271 } 272 return; 273 } 274 275 static int cx231xx_init_audio_isoc(struct cx231xx *dev) 276 { 277 int i, errCode; 278 int sb_size; 279 280 cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__); 281 282 if (dev->state & DEV_DISCONNECTED) 283 return -ENODEV; 284 285 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 286 287 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 288 struct urb *urb; 289 int j, k; 290 291 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 292 if (!dev->adev.transfer_buffer[i]) 293 return -ENOMEM; 294 295 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 296 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC); 297 if (!urb) { 298 cx231xx_errdev("usb_alloc_urb failed!\n"); 299 for (j = 0; j < i; j++) { 300 usb_free_urb(dev->adev.urb[j]); 301 kfree(dev->adev.transfer_buffer[j]); 302 } 303 return -ENOMEM; 304 } 305 306 urb->dev = dev->udev; 307 urb->context = dev; 308 urb->pipe = usb_rcvisocpipe(dev->udev, 309 dev->adev.end_point_addr); 310 urb->transfer_flags = URB_ISO_ASAP; 311 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 312 urb->interval = 1; 313 urb->complete = cx231xx_audio_isocirq; 314 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS; 315 urb->transfer_buffer_length = sb_size; 316 317 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS; 318 j++, k += dev->adev.max_pkt_size) { 319 urb->iso_frame_desc[j].offset = k; 320 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size; 321 } 322 dev->adev.urb[i] = urb; 323 } 324 325 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 326 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 327 if (errCode < 0) { 328 cx231xx_isoc_audio_deinit(dev); 329 return errCode; 330 } 331 } 332 333 return errCode; 334 } 335 336 static int cx231xx_init_audio_bulk(struct cx231xx *dev) 337 { 338 int i, errCode; 339 int sb_size; 340 341 cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__); 342 343 if (dev->state & DEV_DISCONNECTED) 344 return -ENODEV; 345 346 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size; 347 348 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 349 struct urb *urb; 350 int j; 351 352 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); 353 if (!dev->adev.transfer_buffer[i]) 354 return -ENOMEM; 355 356 memset(dev->adev.transfer_buffer[i], 0x80, sb_size); 357 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); 358 if (!urb) { 359 cx231xx_errdev("usb_alloc_urb failed!\n"); 360 for (j = 0; j < i; j++) { 361 usb_free_urb(dev->adev.urb[j]); 362 kfree(dev->adev.transfer_buffer[j]); 363 } 364 return -ENOMEM; 365 } 366 367 urb->dev = dev->udev; 368 urb->context = dev; 369 urb->pipe = usb_rcvbulkpipe(dev->udev, 370 dev->adev.end_point_addr); 371 urb->transfer_flags = 0; 372 urb->transfer_buffer = dev->adev.transfer_buffer[i]; 373 urb->complete = cx231xx_audio_bulkirq; 374 urb->transfer_buffer_length = sb_size; 375 376 dev->adev.urb[i] = urb; 377 378 } 379 380 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) { 381 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 382 if (errCode < 0) { 383 cx231xx_bulk_audio_deinit(dev); 384 return errCode; 385 } 386 } 387 388 return errCode; 389 } 390 391 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 392 size_t size) 393 { 394 struct snd_pcm_runtime *runtime = subs->runtime; 395 396 dprintk("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 dprintk("opening device and trying to acquire exclusive lock\n"); 440 441 if (!dev) { 442 cx231xx_errdev("BUG: cx231xx can't find device struct." 443 " Can't proceed with open\n"); 444 return -ENODEV; 445 } 446 447 if (dev->state & DEV_DISCONNECTED) { 448 cx231xx_errdev("Can't open. the device was removed.\n"); 449 return -ENODEV; 450 } 451 452 /* set alternate setting for audio interface */ 453 /* 1 - 48000 samples per sec */ 454 mutex_lock(&dev->lock); 455 if (dev->USE_ISO) 456 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 457 else 458 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 459 mutex_unlock(&dev->lock); 460 if (ret < 0) { 461 cx231xx_errdev("failed to set alternate setting !\n"); 462 463 return ret; 464 } 465 466 runtime->hw = snd_cx231xx_hw_capture; 467 468 mutex_lock(&dev->lock); 469 /* inform hardware to start streaming */ 470 ret = cx231xx_capture_start(dev, 1, Audio); 471 472 dev->adev.users++; 473 mutex_unlock(&dev->lock); 474 475 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 476 dev->adev.capture_pcm_substream = substream; 477 runtime->private_data = dev; 478 479 return 0; 480 } 481 482 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 483 { 484 int ret; 485 struct cx231xx *dev = snd_pcm_substream_chip(substream); 486 487 dprintk("closing device\n"); 488 489 /* inform hardware to stop streaming */ 490 mutex_lock(&dev->lock); 491 ret = cx231xx_capture_start(dev, 0, Audio); 492 493 /* set alternate setting for audio interface */ 494 /* 1 - 48000 samples per sec */ 495 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 496 if (ret < 0) { 497 cx231xx_errdev("failed to set alternate setting !\n"); 498 499 mutex_unlock(&dev->lock); 500 return ret; 501 } 502 503 dev->adev.users--; 504 mutex_unlock(&dev->lock); 505 506 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 507 dprintk("audio users: %d\n", dev->adev.users); 508 dprintk("disabling audio stream!\n"); 509 dev->adev.shutdown = 0; 510 dprintk("released lock\n"); 511 if (atomic_read(&dev->stream_started) > 0) { 512 atomic_set(&dev->stream_started, 0); 513 schedule_work(&dev->wq_trigger); 514 } 515 } 516 return 0; 517 } 518 519 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 520 struct snd_pcm_hw_params *hw_params) 521 { 522 int ret; 523 524 dprintk("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 dprintk("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 dprintk("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 dprintk("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 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 cx231xx_info("cx231xx-audio.c: probing for cx231xx " 666 "non standard usbaudio\n"); 667 668 err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE, 669 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 snd_card_free(card); 677 return err; 678 } 679 680 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 681 &snd_cx231xx_pcm_capture); 682 pcm->info_flags = 0; 683 pcm->private_data = dev; 684 strcpy(pcm->name, "Conexant cx231xx Capture"); 685 snd_card_set_dev(card, &dev->udev->dev); 686 strcpy(card->driver, "Cx231xx-Audio"); 687 strcpy(card->shortname, "Cx231xx Audio"); 688 strcpy(card->longname, "Conexant cx231xx Audio"); 689 690 INIT_WORK(&dev->wq_trigger, audio_trigger); 691 692 err = snd_card_register(card); 693 if (err < 0) { 694 snd_card_free(card); 695 return err; 696 } 697 adev->sndcard = card; 698 adev->udev = dev->udev; 699 700 /* compute alternate max packet sizes for Audio */ 701 uif = 702 dev->udev->actconfig->interface[dev->current_pcb_config. 703 hs_config_info[0].interface_info. 704 audio_index + 1]; 705 706 adev->end_point_addr = 707 uif->altsetting[0].endpoint[isoc_pipe].desc. 708 bEndpointAddress; 709 710 adev->num_alt = uif->num_altsetting; 711 cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n", 712 adev->end_point_addr, adev->num_alt); 713 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL); 714 715 if (adev->alt_max_pkt_size == NULL) { 716 cx231xx_errdev("out of memory!\n"); 717 return -ENOMEM; 718 } 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 cx231xx_info("Alternate setting %i, max size= %i\n", i, 727 adev->alt_max_pkt_size[i]); 728 } 729 730 return 0; 731 } 732 733 static int cx231xx_audio_fini(struct cx231xx *dev) 734 { 735 if (dev == NULL) 736 return 0; 737 738 if (dev->has_alsa_audio != 1) { 739 /* This device does not support the extension (in this case 740 the device is expecting the snd-usb-audio module or 741 doesn't have analog audio support at all) */ 742 return 0; 743 } 744 745 if (dev->adev.sndcard) { 746 snd_card_free(dev->adev.sndcard); 747 kfree(dev->adev.alt_max_pkt_size); 748 dev->adev.sndcard = NULL; 749 } 750 751 return 0; 752 } 753 754 static struct cx231xx_ops audio_ops = { 755 .id = CX231XX_AUDIO, 756 .name = "Cx231xx Audio Extension", 757 .init = cx231xx_audio_init, 758 .fini = cx231xx_audio_fini, 759 }; 760 761 static int __init cx231xx_alsa_register(void) 762 { 763 return cx231xx_register_extension(&audio_ops); 764 } 765 766 static void __exit cx231xx_alsa_unregister(void) 767 { 768 cx231xx_unregister_extension(&audio_ops); 769 } 770 771 MODULE_LICENSE("GPL"); 772 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 773 MODULE_DESCRIPTION("Cx231xx Audio driver"); 774 775 module_init(cx231xx_alsa_register); 776 module_exit(cx231xx_alsa_unregister); 777