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 /* Sets volume, mute, etc */ 453 dev->mute = 0; 454 455 /* set alternate setting for audio interface */ 456 /* 1 - 48000 samples per sec */ 457 mutex_lock(&dev->lock); 458 if (dev->USE_ISO) 459 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); 460 else 461 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 462 mutex_unlock(&dev->lock); 463 if (ret < 0) { 464 cx231xx_errdev("failed to set alternate setting !\n"); 465 466 return ret; 467 } 468 469 runtime->hw = snd_cx231xx_hw_capture; 470 471 mutex_lock(&dev->lock); 472 /* inform hardware to start streaming */ 473 ret = cx231xx_capture_start(dev, 1, Audio); 474 475 dev->adev.users++; 476 mutex_unlock(&dev->lock); 477 478 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 479 dev->adev.capture_pcm_substream = substream; 480 runtime->private_data = dev; 481 482 return 0; 483 } 484 485 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream) 486 { 487 int ret; 488 struct cx231xx *dev = snd_pcm_substream_chip(substream); 489 490 dprintk("closing device\n"); 491 492 /* inform hardware to stop streaming */ 493 mutex_lock(&dev->lock); 494 ret = cx231xx_capture_start(dev, 0, Audio); 495 496 /* set alternate setting for audio interface */ 497 /* 1 - 48000 samples per sec */ 498 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); 499 if (ret < 0) { 500 cx231xx_errdev("failed to set alternate setting !\n"); 501 502 mutex_unlock(&dev->lock); 503 return ret; 504 } 505 506 dev->mute = 1; 507 dev->adev.users--; 508 mutex_unlock(&dev->lock); 509 510 if (dev->adev.users == 0 && dev->adev.shutdown == 1) { 511 dprintk("audio users: %d\n", dev->adev.users); 512 dprintk("disabling audio stream!\n"); 513 dev->adev.shutdown = 0; 514 dprintk("released lock\n"); 515 if (atomic_read(&dev->stream_started) > 0) { 516 atomic_set(&dev->stream_started, 0); 517 schedule_work(&dev->wq_trigger); 518 } 519 } 520 return 0; 521 } 522 523 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream, 524 struct snd_pcm_hw_params *hw_params) 525 { 526 int ret; 527 528 dprintk("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 dprintk("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 dprintk("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 dprintk("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 cx231xx_info("cx231xx-audio.c: probing for cx231xx " 670 "non standard usbaudio\n"); 671 672 err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE, 673 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 snd_card_set_dev(card, &dev->udev->dev); 690 strcpy(card->driver, "Cx231xx-Audio"); 691 strcpy(card->shortname, "Cx231xx Audio"); 692 strcpy(card->longname, "Conexant cx231xx Audio"); 693 694 INIT_WORK(&dev->wq_trigger, audio_trigger); 695 696 err = snd_card_register(card); 697 if (err < 0) { 698 snd_card_free(card); 699 return err; 700 } 701 adev->sndcard = card; 702 adev->udev = dev->udev; 703 704 /* compute alternate max packet sizes for Audio */ 705 uif = 706 dev->udev->actconfig->interface[dev->current_pcb_config. 707 hs_config_info[0].interface_info. 708 audio_index + 1]; 709 710 adev->end_point_addr = 711 le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc. 712 bEndpointAddress); 713 714 adev->num_alt = uif->num_altsetting; 715 cx231xx_info("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 cx231xx_errdev("out of memory!\n"); 721 return -ENOMEM; 722 } 723 724 for (i = 0; i < adev->num_alt; i++) { 725 u16 tmp = 726 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc. 727 wMaxPacketSize); 728 adev->alt_max_pkt_size[i] = 729 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1); 730 cx231xx_info("Alternate setting %i, max size= %i\n", i, 731 adev->alt_max_pkt_size[i]); 732 } 733 734 return 0; 735 } 736 737 static int cx231xx_audio_fini(struct cx231xx *dev) 738 { 739 if (dev == NULL) 740 return 0; 741 742 if (dev->has_alsa_audio != 1) { 743 /* This device does not support the extension (in this case 744 the device is expecting the snd-usb-audio module or 745 doesn't have analog audio support at all) */ 746 return 0; 747 } 748 749 if (dev->adev.sndcard) { 750 snd_card_free(dev->adev.sndcard); 751 kfree(dev->adev.alt_max_pkt_size); 752 dev->adev.sndcard = NULL; 753 } 754 755 return 0; 756 } 757 758 static struct cx231xx_ops audio_ops = { 759 .id = CX231XX_AUDIO, 760 .name = "Cx231xx Audio Extension", 761 .init = cx231xx_audio_init, 762 .fini = cx231xx_audio_fini, 763 }; 764 765 static int __init cx231xx_alsa_register(void) 766 { 767 return cx231xx_register_extension(&audio_ops); 768 } 769 770 static void __exit cx231xx_alsa_unregister(void) 771 { 772 cx231xx_unregister_extension(&audio_ops); 773 } 774 775 MODULE_LICENSE("GPL"); 776 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>"); 777 MODULE_DESCRIPTION("Cx231xx Audio driver"); 778 779 module_init(cx231xx_alsa_register); 780 module_exit(cx231xx_alsa_unregister); 781