1 /* 2 * Empiatech em28x1 audio extension 3 * 4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 5 * 6 * Copyright (C) 2007-2014 Mauro Carvalho Chehab 7 * - Port to work with the in-kernel driver 8 * - Cleanups, fixes, alsa-controls, etc. 9 * 10 * This driver is based on my previous au600 usb pstn audio driver 11 * and inherits all the copyrights 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/kernel.h> 29 #include <linux/usb.h> 30 #include <linux/init.h> 31 #include <linux/sound.h> 32 #include <linux/spinlock.h> 33 #include <linux/soundcard.h> 34 #include <linux/slab.h> 35 #include <linux/vmalloc.h> 36 #include <linux/proc_fs.h> 37 #include <linux/module.h> 38 #include <sound/core.h> 39 #include <sound/pcm.h> 40 #include <sound/pcm_params.h> 41 #include <sound/info.h> 42 #include <sound/initval.h> 43 #include <sound/control.h> 44 #include <sound/tlv.h> 45 #include <sound/ac97_codec.h> 46 #include <media/v4l2-common.h> 47 #include "em28xx.h" 48 49 static int debug; 50 module_param(debug, int, 0644); 51 MODULE_PARM_DESC(debug, "activates debug info"); 52 53 #define EM28XX_MAX_AUDIO_BUFS 5 54 #define EM28XX_MIN_AUDIO_PACKETS 64 55 56 #define dprintk(fmt, arg...) do { \ 57 if (debug) \ 58 printk(KERN_INFO "em28xx-audio %s: " fmt, \ 59 __func__, ##arg); \ 60 } while (0) 61 62 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 63 64 static int em28xx_deinit_isoc_audio(struct em28xx *dev) 65 { 66 int i; 67 68 dprintk("Stopping isoc\n"); 69 for (i = 0; i < dev->adev.num_urb; i++) { 70 struct urb *urb = dev->adev.urb[i]; 71 72 if (!irqs_disabled()) 73 usb_kill_urb(urb); 74 else 75 usb_unlink_urb(urb); 76 } 77 78 return 0; 79 } 80 81 static void em28xx_audio_isocirq(struct urb *urb) 82 { 83 struct em28xx *dev = urb->context; 84 int i; 85 unsigned int oldptr; 86 int period_elapsed = 0; 87 int status; 88 unsigned char *cp; 89 unsigned int stride; 90 struct snd_pcm_substream *substream; 91 struct snd_pcm_runtime *runtime; 92 93 if (dev->disconnected) { 94 dprintk("device disconnected while streaming. URB status=%d.\n", urb->status); 95 atomic_set(&dev->stream_started, 0); 96 return; 97 } 98 99 switch (urb->status) { 100 case 0: /* success */ 101 case -ETIMEDOUT: /* NAK */ 102 break; 103 case -ECONNRESET: /* kill */ 104 case -ENOENT: 105 case -ESHUTDOWN: 106 return; 107 default: /* error */ 108 dprintk("urb completition error %d.\n", urb->status); 109 break; 110 } 111 112 if (atomic_read(&dev->stream_started) == 0) 113 return; 114 115 if (dev->adev.capture_pcm_substream) { 116 substream = dev->adev.capture_pcm_substream; 117 runtime = substream->runtime; 118 stride = runtime->frame_bits >> 3; 119 120 for (i = 0; i < urb->number_of_packets; i++) { 121 int length = 122 urb->iso_frame_desc[i].actual_length / stride; 123 cp = (unsigned char *)urb->transfer_buffer + 124 urb->iso_frame_desc[i].offset; 125 126 if (!length) 127 continue; 128 129 oldptr = dev->adev.hwptr_done_capture; 130 if (oldptr + length >= runtime->buffer_size) { 131 unsigned int cnt = 132 runtime->buffer_size - oldptr; 133 memcpy(runtime->dma_area + oldptr * stride, cp, 134 cnt * stride); 135 memcpy(runtime->dma_area, cp + cnt * stride, 136 length * stride - cnt * stride); 137 } else { 138 memcpy(runtime->dma_area + oldptr * stride, cp, 139 length * stride); 140 } 141 142 snd_pcm_stream_lock(substream); 143 144 dev->adev.hwptr_done_capture += length; 145 if (dev->adev.hwptr_done_capture >= 146 runtime->buffer_size) 147 dev->adev.hwptr_done_capture -= 148 runtime->buffer_size; 149 150 dev->adev.capture_transfer_done += length; 151 if (dev->adev.capture_transfer_done >= 152 runtime->period_size) { 153 dev->adev.capture_transfer_done -= 154 runtime->period_size; 155 period_elapsed = 1; 156 } 157 158 snd_pcm_stream_unlock(substream); 159 } 160 if (period_elapsed) 161 snd_pcm_period_elapsed(substream); 162 } 163 urb->status = 0; 164 165 status = usb_submit_urb(urb, GFP_ATOMIC); 166 if (status < 0) 167 em28xx_errdev("resubmit of audio urb failed (error=%i)\n", 168 status); 169 return; 170 } 171 172 static int em28xx_init_audio_isoc(struct em28xx *dev) 173 { 174 int i, errCode; 175 176 dprintk("Starting isoc transfers\n"); 177 178 /* Start streaming */ 179 for (i = 0; i < dev->adev.num_urb; i++) { 180 memset(dev->adev.transfer_buffer[i], 0x80, 181 dev->adev.urb[i]->transfer_buffer_length); 182 183 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 184 if (errCode) { 185 em28xx_errdev("submit of audio urb failed (error=%i)\n", 186 errCode); 187 em28xx_deinit_isoc_audio(dev); 188 atomic_set(&dev->stream_started, 0); 189 return errCode; 190 } 191 192 } 193 194 return 0; 195 } 196 197 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 198 size_t size) 199 { 200 struct snd_pcm_runtime *runtime = subs->runtime; 201 202 dprintk("Allocating vbuffer\n"); 203 if (runtime->dma_area) { 204 if (runtime->dma_bytes > size) 205 return 0; 206 207 vfree(runtime->dma_area); 208 } 209 runtime->dma_area = vmalloc(size); 210 if (!runtime->dma_area) 211 return -ENOMEM; 212 213 runtime->dma_bytes = size; 214 215 return 0; 216 } 217 218 static struct snd_pcm_hardware snd_em28xx_hw_capture = { 219 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 220 SNDRV_PCM_INFO_MMAP | 221 SNDRV_PCM_INFO_INTERLEAVED | 222 SNDRV_PCM_INFO_BATCH | 223 SNDRV_PCM_INFO_MMAP_VALID, 224 225 .formats = SNDRV_PCM_FMTBIT_S16_LE, 226 227 .rates = SNDRV_PCM_RATE_48000, 228 229 .rate_min = 48000, 230 .rate_max = 48000, 231 .channels_min = 2, 232 .channels_max = 2, 233 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 234 235 236 /* 237 * The period is 12.288 bytes. Allow a 10% of variation along its 238 * value, in order to avoid overruns/underruns due to some clock 239 * drift. 240 * 241 * FIXME: This period assumes 64 packets, and a 48000 PCM rate. 242 * Calculate it dynamically. 243 */ 244 .period_bytes_min = 11059, 245 .period_bytes_max = 13516, 246 247 .periods_min = 2, 248 .periods_max = 98, /* 12544, */ 249 }; 250 251 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) 252 { 253 struct em28xx *dev = snd_pcm_substream_chip(substream); 254 struct snd_pcm_runtime *runtime = substream->runtime; 255 int ret = 0; 256 257 if (!dev) { 258 em28xx_err("BUG: em28xx can't find device struct." 259 " Can't proceed with open\n"); 260 return -ENODEV; 261 } 262 263 if (dev->disconnected) 264 return -ENODEV; 265 266 dprintk("opening device and trying to acquire exclusive lock\n"); 267 268 runtime->hw = snd_em28xx_hw_capture; 269 if ((dev->alt == 0 || dev->is_audio_only) && dev->adev.users == 0) { 270 int nonblock = !!(substream->f_flags & O_NONBLOCK); 271 272 if (nonblock) { 273 if (!mutex_trylock(&dev->lock)) 274 return -EAGAIN; 275 } else 276 mutex_lock(&dev->lock); 277 if (dev->is_audio_only) 278 /* vendor audio is on a separate interface */ 279 dev->alt = 1; 280 else 281 /* vendor audio is on the same interface as video */ 282 dev->alt = 7; 283 /* 284 * FIXME: The intention seems to be to select the alt 285 * setting with the largest wMaxPacketSize for the video 286 * endpoint. 287 * At least dev->alt should be used instead, but we 288 * should probably not touch it at all if it is 289 * already >0, because wMaxPacketSize of the audio 290 * endpoints seems to be the same for all. 291 */ 292 293 dprintk("changing alternate number on interface %d to %d\n", 294 dev->ifnum, dev->alt); 295 usb_set_interface(dev->udev, dev->ifnum, dev->alt); 296 297 /* Sets volume, mute, etc */ 298 dev->mute = 0; 299 ret = em28xx_audio_analog_set(dev); 300 if (ret < 0) 301 goto err; 302 303 dev->adev.users++; 304 mutex_unlock(&dev->lock); 305 } 306 307 /* Dynamically adjust the period size */ 308 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 309 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 310 dev->adev.period * 95 / 100, 311 dev->adev.period * 105 / 100); 312 313 dev->adev.capture_pcm_substream = substream; 314 315 return 0; 316 err: 317 mutex_unlock(&dev->lock); 318 319 em28xx_err("Error while configuring em28xx mixer\n"); 320 return ret; 321 } 322 323 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 324 { 325 struct em28xx *dev = snd_pcm_substream_chip(substream); 326 327 dprintk("closing device\n"); 328 329 dev->mute = 1; 330 mutex_lock(&dev->lock); 331 dev->adev.users--; 332 if (atomic_read(&dev->stream_started) > 0) { 333 atomic_set(&dev->stream_started, 0); 334 schedule_work(&dev->wq_trigger); 335 } 336 337 em28xx_audio_analog_set(dev); 338 if (substream->runtime->dma_area) { 339 dprintk("freeing\n"); 340 vfree(substream->runtime->dma_area); 341 substream->runtime->dma_area = NULL; 342 } 343 mutex_unlock(&dev->lock); 344 345 return 0; 346 } 347 348 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 349 struct snd_pcm_hw_params *hw_params) 350 { 351 int ret; 352 struct em28xx *dev = snd_pcm_substream_chip(substream); 353 354 if (dev->disconnected) 355 return -ENODEV; 356 357 dprintk("Setting capture parameters\n"); 358 359 ret = snd_pcm_alloc_vmalloc_buffer(substream, 360 params_buffer_bytes(hw_params)); 361 if (ret < 0) 362 return ret; 363 #if 0 364 /* TODO: set up em28xx audio chip to deliver the correct audio format, 365 current default is 48000hz multiplexed => 96000hz mono 366 which shouldn't matter since analogue TV only supports mono */ 367 unsigned int channels, rate, format; 368 369 format = params_format(hw_params); 370 rate = params_rate(hw_params); 371 channels = params_channels(hw_params); 372 #endif 373 374 return 0; 375 } 376 377 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 378 { 379 struct em28xx *dev = snd_pcm_substream_chip(substream); 380 381 dprintk("Stop capture, if needed\n"); 382 383 if (atomic_read(&dev->stream_started) > 0) { 384 atomic_set(&dev->stream_started, 0); 385 schedule_work(&dev->wq_trigger); 386 } 387 388 return 0; 389 } 390 391 static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 392 { 393 struct em28xx *dev = snd_pcm_substream_chip(substream); 394 395 if (dev->disconnected) 396 return -ENODEV; 397 398 dev->adev.hwptr_done_capture = 0; 399 dev->adev.capture_transfer_done = 0; 400 401 return 0; 402 } 403 404 static void audio_trigger(struct work_struct *work) 405 { 406 struct em28xx *dev = container_of(work, struct em28xx, wq_trigger); 407 408 if (atomic_read(&dev->stream_started)) { 409 dprintk("starting capture"); 410 em28xx_init_audio_isoc(dev); 411 } else { 412 dprintk("stopping capture"); 413 em28xx_deinit_isoc_audio(dev); 414 } 415 } 416 417 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 418 int cmd) 419 { 420 struct em28xx *dev = snd_pcm_substream_chip(substream); 421 int retval = 0; 422 423 if (dev->disconnected) 424 return -ENODEV; 425 426 switch (cmd) { 427 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 428 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 429 case SNDRV_PCM_TRIGGER_START: 430 atomic_set(&dev->stream_started, 1); 431 break; 432 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 433 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 434 case SNDRV_PCM_TRIGGER_STOP: 435 atomic_set(&dev->stream_started, 0); 436 break; 437 default: 438 retval = -EINVAL; 439 } 440 schedule_work(&dev->wq_trigger); 441 return retval; 442 } 443 444 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 445 *substream) 446 { 447 unsigned long flags; 448 struct em28xx *dev; 449 snd_pcm_uframes_t hwptr_done; 450 451 dev = snd_pcm_substream_chip(substream); 452 if (dev->disconnected) 453 return SNDRV_PCM_POS_XRUN; 454 455 spin_lock_irqsave(&dev->adev.slock, flags); 456 hwptr_done = dev->adev.hwptr_done_capture; 457 spin_unlock_irqrestore(&dev->adev.slock, flags); 458 459 return hwptr_done; 460 } 461 462 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 463 unsigned long offset) 464 { 465 void *pageptr = subs->runtime->dma_area + offset; 466 467 return vmalloc_to_page(pageptr); 468 } 469 470 /* 471 * AC97 volume control support 472 */ 473 static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 474 struct snd_ctl_elem_info *info) 475 { 476 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 477 478 if (dev->disconnected) 479 return -ENODEV; 480 481 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 482 info->count = 2; 483 info->value.integer.min = 0; 484 info->value.integer.max = 0x1f; 485 486 return 0; 487 } 488 489 static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 490 struct snd_ctl_elem_value *value) 491 { 492 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 493 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 494 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 495 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 496 int nonblock = 0; 497 int rc; 498 499 if (dev->disconnected) 500 return -ENODEV; 501 502 if (substream) 503 nonblock = !!(substream->f_flags & O_NONBLOCK); 504 if (nonblock) { 505 if (!mutex_trylock(&dev->lock)) 506 return -EAGAIN; 507 } else 508 mutex_lock(&dev->lock); 509 rc = em28xx_read_ac97(dev, kcontrol->private_value); 510 if (rc < 0) 511 goto err; 512 513 val |= rc & 0x8000; /* Preserve the mute flag */ 514 515 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 516 if (rc < 0) 517 goto err; 518 519 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 520 (val & 0x8000) ? "muted " : "", 521 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 522 val, (int)kcontrol->private_value); 523 524 err: 525 mutex_unlock(&dev->lock); 526 return rc; 527 } 528 529 static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 530 struct snd_ctl_elem_value *value) 531 { 532 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 533 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 534 int nonblock = 0; 535 int val; 536 537 if (dev->disconnected) 538 return -ENODEV; 539 540 if (substream) 541 nonblock = !!(substream->f_flags & O_NONBLOCK); 542 if (nonblock) { 543 if (!mutex_trylock(&dev->lock)) 544 return -EAGAIN; 545 } else 546 mutex_lock(&dev->lock); 547 val = em28xx_read_ac97(dev, kcontrol->private_value); 548 mutex_unlock(&dev->lock); 549 if (val < 0) 550 return val; 551 552 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 553 (val & 0x8000) ? "muted " : "", 554 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 555 val, (int)kcontrol->private_value); 556 557 value->value.integer.value[0] = 0x1f - (val & 0x1f); 558 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); 559 560 return 0; 561 } 562 563 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 564 struct snd_ctl_elem_value *value) 565 { 566 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 567 u16 val = value->value.integer.value[0]; 568 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 569 int nonblock = 0; 570 int rc; 571 572 if (dev->disconnected) 573 return -ENODEV; 574 575 if (substream) 576 nonblock = !!(substream->f_flags & O_NONBLOCK); 577 if (nonblock) { 578 if (!mutex_trylock(&dev->lock)) 579 return -EAGAIN; 580 } else 581 mutex_lock(&dev->lock); 582 rc = em28xx_read_ac97(dev, kcontrol->private_value); 583 if (rc < 0) 584 goto err; 585 586 if (val) 587 rc &= 0x1f1f; 588 else 589 rc |= 0x8000; 590 591 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 592 if (rc < 0) 593 goto err; 594 595 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 596 (val & 0x8000) ? "muted " : "", 597 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 598 val, (int)kcontrol->private_value); 599 600 err: 601 mutex_unlock(&dev->lock); 602 return rc; 603 } 604 605 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 606 struct snd_ctl_elem_value *value) 607 { 608 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 609 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 610 int nonblock = 0; 611 int val; 612 613 if (dev->disconnected) 614 return -ENODEV; 615 616 if (substream) 617 nonblock = !!(substream->f_flags & O_NONBLOCK); 618 if (nonblock) { 619 if (!mutex_trylock(&dev->lock)) 620 return -EAGAIN; 621 } else 622 mutex_lock(&dev->lock); 623 val = em28xx_read_ac97(dev, kcontrol->private_value); 624 mutex_unlock(&dev->lock); 625 if (val < 0) 626 return val; 627 628 if (val & 0x8000) 629 value->value.integer.value[0] = 0; 630 else 631 value->value.integer.value[0] = 1; 632 633 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 634 (val & 0x8000) ? "muted " : "", 635 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 636 val, (int)kcontrol->private_value); 637 638 return 0; 639 } 640 641 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 642 643 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 644 char *name, int id) 645 { 646 int err; 647 char ctl_name[44]; 648 struct snd_kcontrol *kctl; 649 struct snd_kcontrol_new tmp; 650 651 memset (&tmp, 0, sizeof(tmp)); 652 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 653 tmp.private_value = id, 654 tmp.name = ctl_name, 655 656 /* Add Mute Control */ 657 sprintf(ctl_name, "%s Switch", name); 658 tmp.get = em28xx_vol_get_mute; 659 tmp.put = em28xx_vol_put_mute; 660 tmp.info = snd_ctl_boolean_mono_info; 661 kctl = snd_ctl_new1(&tmp, dev); 662 err = snd_ctl_add(card, kctl); 663 if (err < 0) 664 return err; 665 dprintk("Added control %s for ac97 volume control 0x%04x\n", 666 ctl_name, id); 667 668 memset (&tmp, 0, sizeof(tmp)); 669 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 670 tmp.private_value = id, 671 tmp.name = ctl_name, 672 673 /* Add Volume Control */ 674 sprintf(ctl_name, "%s Volume", name); 675 tmp.get = em28xx_vol_get; 676 tmp.put = em28xx_vol_put; 677 tmp.info = em28xx_vol_info; 678 tmp.tlv.p = em28xx_db_scale, 679 kctl = snd_ctl_new1(&tmp, dev); 680 err = snd_ctl_add(card, kctl); 681 if (err < 0) 682 return err; 683 dprintk("Added control %s for ac97 volume control 0x%04x\n", 684 ctl_name, id); 685 686 return 0; 687 } 688 689 /* 690 * register/unregister code and data 691 */ 692 static struct snd_pcm_ops snd_em28xx_pcm_capture = { 693 .open = snd_em28xx_capture_open, 694 .close = snd_em28xx_pcm_close, 695 .ioctl = snd_pcm_lib_ioctl, 696 .hw_params = snd_em28xx_hw_capture_params, 697 .hw_free = snd_em28xx_hw_capture_free, 698 .prepare = snd_em28xx_prepare, 699 .trigger = snd_em28xx_capture_trigger, 700 .pointer = snd_em28xx_capture_pointer, 701 .page = snd_pcm_get_vmalloc_page, 702 }; 703 704 static void em28xx_audio_free_urb(struct em28xx *dev) 705 { 706 int i; 707 708 for (i = 0; i < dev->adev.num_urb; i++) { 709 struct urb *urb = dev->adev.urb[i]; 710 711 if (!urb) 712 continue; 713 714 usb_free_coherent(dev->udev, urb->transfer_buffer_length, 715 dev->adev.transfer_buffer[i], 716 urb->transfer_dma); 717 718 usb_free_urb(urb); 719 } 720 kfree(dev->adev.urb); 721 kfree(dev->adev.transfer_buffer); 722 dev->adev.num_urb = 0; 723 } 724 725 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ 726 static int em28xx_audio_ep_packet_size(struct usb_device *udev, 727 struct usb_endpoint_descriptor *e) 728 { 729 int size = le16_to_cpu(e->wMaxPacketSize); 730 731 if (udev->speed == USB_SPEED_HIGH) 732 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); 733 734 return size & 0x7ff; 735 } 736 737 static int em28xx_audio_urb_init(struct em28xx *dev) 738 { 739 struct usb_interface *intf; 740 struct usb_endpoint_descriptor *e, *ep = NULL; 741 int i, ep_size, interval, num_urb, npackets; 742 int urb_size, bytes_per_transfer; 743 u8 alt; 744 745 if (dev->ifnum) 746 alt = 1; 747 else 748 alt = 7; 749 750 intf = usb_ifnum_to_if(dev->udev, dev->ifnum); 751 752 if (intf->num_altsetting <= alt) { 753 em28xx_errdev("alt %d doesn't exist on interface %d\n", 754 dev->ifnum, alt); 755 return -ENODEV; 756 } 757 758 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { 759 e = &intf->altsetting[alt].endpoint[i].desc; 760 if (!usb_endpoint_dir_in(e)) 761 continue; 762 if (e->bEndpointAddress == EM28XX_EP_AUDIO) { 763 ep = e; 764 break; 765 } 766 } 767 768 if (!ep) { 769 em28xx_errdev("Couldn't find an audio endpoint"); 770 return -ENODEV; 771 } 772 773 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep); 774 interval = 1 << (ep->bInterval - 1); 775 776 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", 777 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed), 778 dev->ifnum, alt, 779 interval, 780 ep_size); 781 782 /* Calculate the number and size of URBs to better fit the audio samples */ 783 784 /* 785 * Estimate the number of bytes per DMA transfer. 786 * 787 * This is given by the bit rate (for now, only 48000 Hz) multiplied 788 * by 2 channels and 2 bytes/sample divided by the number of microframe 789 * intervals and by the microframe rate (125 us) 790 */ 791 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); 792 793 /* 794 * Estimate the number of transfer URBs. Don't let it go past the 795 * maximum number of URBs that is known to be supported by the device. 796 */ 797 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); 798 if (num_urb > EM28XX_MAX_AUDIO_BUFS) 799 num_urb = EM28XX_MAX_AUDIO_BUFS; 800 801 /* 802 * Now that we know the number of bytes per transfer and the number of 803 * URBs, estimate the typical size of an URB, in order to adjust the 804 * minimal number of packets. 805 */ 806 urb_size = bytes_per_transfer / num_urb; 807 808 /* 809 * Now, calculate the amount of audio packets to be filled on each 810 * URB. In order to preserve the old behaviour, use a minimal 811 * threshold for this value. 812 */ 813 npackets = EM28XX_MIN_AUDIO_PACKETS; 814 if (urb_size > ep_size * npackets) 815 npackets = DIV_ROUND_UP(urb_size, ep_size); 816 817 em28xx_info("Number of URBs: %d, with %d packets and %d size", 818 num_urb, npackets, urb_size); 819 820 /* Estimate the bytes per period */ 821 dev->adev.period = urb_size * npackets; 822 823 /* Allocate space to store the number of URBs to be used */ 824 825 dev->adev.transfer_buffer = kcalloc(num_urb, 826 sizeof(*dev->adev.transfer_buffer), 827 GFP_ATOMIC); 828 if (!dev->adev.transfer_buffer) { 829 return -ENOMEM; 830 } 831 832 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC); 833 if (!dev->adev.urb) { 834 kfree(dev->adev.transfer_buffer); 835 return -ENOMEM; 836 } 837 838 /* Alloc memory for each URB and for each transfer buffer */ 839 dev->adev.num_urb = num_urb; 840 for (i = 0; i < num_urb; i++) { 841 struct urb *urb; 842 int j, k; 843 void *buf; 844 845 urb = usb_alloc_urb(npackets, GFP_ATOMIC); 846 if (!urb) { 847 em28xx_errdev("usb_alloc_urb failed!\n"); 848 em28xx_audio_free_urb(dev); 849 return -ENOMEM; 850 } 851 dev->adev.urb[i] = urb; 852 853 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC, 854 &urb->transfer_dma); 855 if (!buf) { 856 em28xx_errdev("usb_alloc_coherent failed!\n"); 857 em28xx_audio_free_urb(dev); 858 return -ENOMEM; 859 } 860 dev->adev.transfer_buffer[i] = buf; 861 862 urb->dev = dev->udev; 863 urb->context = dev; 864 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO); 865 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 866 urb->transfer_buffer = buf; 867 urb->interval = interval; 868 urb->complete = em28xx_audio_isocirq; 869 urb->number_of_packets = npackets; 870 urb->transfer_buffer_length = ep_size * npackets; 871 872 for (j = k = 0; j < npackets; j++, k += ep_size) { 873 urb->iso_frame_desc[j].offset = k; 874 urb->iso_frame_desc[j].length = ep_size; 875 } 876 } 877 878 return 0; 879 } 880 881 static int em28xx_audio_init(struct em28xx *dev) 882 { 883 struct em28xx_audio *adev = &dev->adev; 884 struct snd_pcm *pcm; 885 struct snd_card *card; 886 static int devnr; 887 int err; 888 889 if (!dev->has_alsa_audio) { 890 /* This device does not support the extension (in this case 891 the device is expecting the snd-usb-audio module or 892 doesn't have analog audio support at all) */ 893 return 0; 894 } 895 896 em28xx_info("Binding audio extension\n"); 897 898 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " 899 "Rechberger\n"); 900 printk(KERN_INFO 901 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n"); 902 903 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0, 904 &card); 905 if (err < 0) 906 return err; 907 908 spin_lock_init(&adev->slock); 909 adev->sndcard = card; 910 adev->udev = dev->udev; 911 912 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 913 if (err < 0) 914 goto card_free; 915 916 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 917 pcm->info_flags = 0; 918 pcm->private_data = dev; 919 strcpy(pcm->name, "Empia 28xx Capture"); 920 921 snd_card_set_dev(card, &dev->udev->dev); 922 strcpy(card->driver, "Em28xx-Audio"); 923 strcpy(card->shortname, "Em28xx Audio"); 924 strcpy(card->longname, "Empia Em28xx Audio"); 925 926 INIT_WORK(&dev->wq_trigger, audio_trigger); 927 928 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 929 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); 930 em28xx_cvol_new(card, dev, "Line In", AC97_LINE); 931 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); 932 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); 933 em28xx_cvol_new(card, dev, "CD", AC97_CD); 934 em28xx_cvol_new(card, dev, "AUX", AC97_AUX); 935 em28xx_cvol_new(card, dev, "PCM", AC97_PCM); 936 937 em28xx_cvol_new(card, dev, "Master", AC97_MASTER); 938 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); 939 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); 940 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); 941 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); 942 } 943 944 err = em28xx_audio_urb_init(dev); 945 if (err) 946 goto card_free; 947 948 err = snd_card_register(card); 949 if (err < 0) 950 goto urb_free; 951 952 em28xx_info("Audio extension successfully initialized\n"); 953 return 0; 954 955 urb_free: 956 em28xx_audio_free_urb(dev); 957 958 card_free: 959 snd_card_free(card); 960 adev->sndcard = NULL; 961 962 return err; 963 } 964 965 static int em28xx_audio_fini(struct em28xx *dev) 966 { 967 if (dev == NULL) 968 return 0; 969 970 if (dev->has_alsa_audio != 1) { 971 /* This device does not support the extension (in this case 972 the device is expecting the snd-usb-audio module or 973 doesn't have analog audio support at all) */ 974 return 0; 975 } 976 977 em28xx_info("Closing audio extension"); 978 979 if (dev->adev.sndcard) { 980 snd_card_disconnect(dev->adev.sndcard); 981 flush_work(&dev->wq_trigger); 982 983 em28xx_audio_free_urb(dev); 984 985 snd_card_free(dev->adev.sndcard); 986 dev->adev.sndcard = NULL; 987 } 988 989 return 0; 990 } 991 992 static struct em28xx_ops audio_ops = { 993 .id = EM28XX_AUDIO, 994 .name = "Em28xx Audio Extension", 995 .init = em28xx_audio_init, 996 .fini = em28xx_audio_fini, 997 }; 998 999 static int __init em28xx_alsa_register(void) 1000 { 1001 return em28xx_register_extension(&audio_ops); 1002 } 1003 1004 static void __exit em28xx_alsa_unregister(void) 1005 { 1006 em28xx_unregister_extension(&audio_ops); 1007 } 1008 1009 MODULE_LICENSE("GPL"); 1010 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 1011 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>"); 1012 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); 1013 MODULE_VERSION(EM28XX_VERSION); 1014 1015 module_init(em28xx_alsa_register); 1016 module_exit(em28xx_alsa_unregister); 1017