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->adev.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->adev.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->adev.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 nonblock, 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 nonblock = !!(substream->f_flags & O_NONBLOCK); 269 if (nonblock) { 270 if (!mutex_trylock(&dev->lock)) 271 return -EAGAIN; 272 } else 273 mutex_lock(&dev->lock); 274 275 runtime->hw = snd_em28xx_hw_capture; 276 277 if (dev->adev.users == 0) { 278 if (dev->alt == 0 || dev->is_audio_only) { 279 if (dev->is_audio_only) 280 /* audio is on a separate interface */ 281 dev->alt = 1; 282 else 283 /* audio is on the same interface as video */ 284 dev->alt = 7; 285 /* 286 * FIXME: The intention seems to be to select 287 * the alt setting with the largest 288 * wMaxPacketSize for the video endpoint. 289 * At least dev->alt should be used instead, but 290 * we should probably not touch it at all if it 291 * is already >0, because wMaxPacketSize of the 292 * audio endpoints seems to be the same for all. 293 */ 294 dprintk("changing alternate number on interface %d to %d\n", 295 dev->ifnum, dev->alt); 296 usb_set_interface(dev->udev, dev->ifnum, dev->alt); 297 } 298 299 /* Sets volume, mute, etc */ 300 dev->mute = 0; 301 ret = em28xx_audio_analog_set(dev); 302 if (ret < 0) 303 goto err; 304 } 305 306 kref_get(&dev->ref); 307 dev->adev.users++; 308 mutex_unlock(&dev->lock); 309 310 /* Dynamically adjust the period size */ 311 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 312 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 313 dev->adev.period * 95 / 100, 314 dev->adev.period * 105 / 100); 315 316 dev->adev.capture_pcm_substream = substream; 317 318 return 0; 319 err: 320 mutex_unlock(&dev->lock); 321 322 em28xx_err("Error while configuring em28xx mixer\n"); 323 return ret; 324 } 325 326 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 327 { 328 struct em28xx *dev = snd_pcm_substream_chip(substream); 329 330 dprintk("closing device\n"); 331 332 dev->mute = 1; 333 mutex_lock(&dev->lock); 334 dev->adev.users--; 335 if (atomic_read(&dev->adev.stream_started) > 0) { 336 atomic_set(&dev->adev.stream_started, 0); 337 schedule_work(&dev->adev.wq_trigger); 338 } 339 340 em28xx_audio_analog_set(dev); 341 if (substream->runtime->dma_area) { 342 dprintk("freeing\n"); 343 vfree(substream->runtime->dma_area); 344 substream->runtime->dma_area = NULL; 345 } 346 mutex_unlock(&dev->lock); 347 kref_put(&dev->ref, em28xx_free_device); 348 349 return 0; 350 } 351 352 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 353 struct snd_pcm_hw_params *hw_params) 354 { 355 int ret; 356 struct em28xx *dev = snd_pcm_substream_chip(substream); 357 358 if (dev->disconnected) 359 return -ENODEV; 360 361 dprintk("Setting capture parameters\n"); 362 363 ret = snd_pcm_alloc_vmalloc_buffer(substream, 364 params_buffer_bytes(hw_params)); 365 if (ret < 0) 366 return ret; 367 #if 0 368 /* TODO: set up em28xx audio chip to deliver the correct audio format, 369 current default is 48000hz multiplexed => 96000hz mono 370 which shouldn't matter since analogue TV only supports mono */ 371 unsigned int channels, rate, format; 372 373 format = params_format(hw_params); 374 rate = params_rate(hw_params); 375 channels = params_channels(hw_params); 376 #endif 377 378 return 0; 379 } 380 381 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 382 { 383 struct em28xx *dev = snd_pcm_substream_chip(substream); 384 struct em28xx_audio *adev = &dev->adev; 385 386 dprintk("Stop capture, if needed\n"); 387 388 if (atomic_read(&adev->stream_started) > 0) { 389 atomic_set(&adev->stream_started, 0); 390 schedule_work(&adev->wq_trigger); 391 } 392 393 return 0; 394 } 395 396 static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 397 { 398 struct em28xx *dev = snd_pcm_substream_chip(substream); 399 400 if (dev->disconnected) 401 return -ENODEV; 402 403 dev->adev.hwptr_done_capture = 0; 404 dev->adev.capture_transfer_done = 0; 405 406 return 0; 407 } 408 409 static void audio_trigger(struct work_struct *work) 410 { 411 struct em28xx_audio *adev = 412 container_of(work, struct em28xx_audio, wq_trigger); 413 struct em28xx *dev = container_of(adev, struct em28xx, adev); 414 415 if (atomic_read(&adev->stream_started)) { 416 dprintk("starting capture"); 417 em28xx_init_audio_isoc(dev); 418 } else { 419 dprintk("stopping capture"); 420 em28xx_deinit_isoc_audio(dev); 421 } 422 } 423 424 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 425 int cmd) 426 { 427 struct em28xx *dev = snd_pcm_substream_chip(substream); 428 int retval = 0; 429 430 if (dev->disconnected) 431 return -ENODEV; 432 433 switch (cmd) { 434 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 435 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 436 case SNDRV_PCM_TRIGGER_START: 437 atomic_set(&dev->adev.stream_started, 1); 438 break; 439 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 440 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 441 case SNDRV_PCM_TRIGGER_STOP: 442 atomic_set(&dev->adev.stream_started, 0); 443 break; 444 default: 445 retval = -EINVAL; 446 } 447 schedule_work(&dev->adev.wq_trigger); 448 return retval; 449 } 450 451 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 452 *substream) 453 { 454 unsigned long flags; 455 struct em28xx *dev; 456 snd_pcm_uframes_t hwptr_done; 457 458 dev = snd_pcm_substream_chip(substream); 459 if (dev->disconnected) 460 return SNDRV_PCM_POS_XRUN; 461 462 spin_lock_irqsave(&dev->adev.slock, flags); 463 hwptr_done = dev->adev.hwptr_done_capture; 464 spin_unlock_irqrestore(&dev->adev.slock, flags); 465 466 return hwptr_done; 467 } 468 469 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 470 unsigned long offset) 471 { 472 void *pageptr = subs->runtime->dma_area + offset; 473 474 return vmalloc_to_page(pageptr); 475 } 476 477 /* 478 * AC97 volume control support 479 */ 480 static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 481 struct snd_ctl_elem_info *info) 482 { 483 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 484 485 if (dev->disconnected) 486 return -ENODEV; 487 488 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 489 info->count = 2; 490 info->value.integer.min = 0; 491 info->value.integer.max = 0x1f; 492 493 return 0; 494 } 495 496 static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 497 struct snd_ctl_elem_value *value) 498 { 499 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 500 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 501 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 502 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 503 int nonblock = 0; 504 int rc; 505 506 if (dev->disconnected) 507 return -ENODEV; 508 509 if (substream) 510 nonblock = !!(substream->f_flags & O_NONBLOCK); 511 if (nonblock) { 512 if (!mutex_trylock(&dev->lock)) 513 return -EAGAIN; 514 } else 515 mutex_lock(&dev->lock); 516 rc = em28xx_read_ac97(dev, kcontrol->private_value); 517 if (rc < 0) 518 goto err; 519 520 val |= rc & 0x8000; /* Preserve the mute flag */ 521 522 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 523 if (rc < 0) 524 goto err; 525 526 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 527 (val & 0x8000) ? "muted " : "", 528 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 529 val, (int)kcontrol->private_value); 530 531 err: 532 mutex_unlock(&dev->lock); 533 return rc; 534 } 535 536 static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 537 struct snd_ctl_elem_value *value) 538 { 539 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 540 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 541 int nonblock = 0; 542 int val; 543 544 if (dev->disconnected) 545 return -ENODEV; 546 547 if (substream) 548 nonblock = !!(substream->f_flags & O_NONBLOCK); 549 if (nonblock) { 550 if (!mutex_trylock(&dev->lock)) 551 return -EAGAIN; 552 } else 553 mutex_lock(&dev->lock); 554 val = em28xx_read_ac97(dev, kcontrol->private_value); 555 mutex_unlock(&dev->lock); 556 if (val < 0) 557 return val; 558 559 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 560 (val & 0x8000) ? "muted " : "", 561 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 562 val, (int)kcontrol->private_value); 563 564 value->value.integer.value[0] = 0x1f - (val & 0x1f); 565 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); 566 567 return 0; 568 } 569 570 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 571 struct snd_ctl_elem_value *value) 572 { 573 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 574 u16 val = value->value.integer.value[0]; 575 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 576 int nonblock = 0; 577 int rc; 578 579 if (dev->disconnected) 580 return -ENODEV; 581 582 if (substream) 583 nonblock = !!(substream->f_flags & O_NONBLOCK); 584 if (nonblock) { 585 if (!mutex_trylock(&dev->lock)) 586 return -EAGAIN; 587 } else 588 mutex_lock(&dev->lock); 589 rc = em28xx_read_ac97(dev, kcontrol->private_value); 590 if (rc < 0) 591 goto err; 592 593 if (val) 594 rc &= 0x1f1f; 595 else 596 rc |= 0x8000; 597 598 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 599 if (rc < 0) 600 goto err; 601 602 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 603 (val & 0x8000) ? "muted " : "", 604 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 605 val, (int)kcontrol->private_value); 606 607 err: 608 mutex_unlock(&dev->lock); 609 return rc; 610 } 611 612 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 613 struct snd_ctl_elem_value *value) 614 { 615 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 616 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 617 int nonblock = 0; 618 int val; 619 620 if (dev->disconnected) 621 return -ENODEV; 622 623 if (substream) 624 nonblock = !!(substream->f_flags & O_NONBLOCK); 625 if (nonblock) { 626 if (!mutex_trylock(&dev->lock)) 627 return -EAGAIN; 628 } else 629 mutex_lock(&dev->lock); 630 val = em28xx_read_ac97(dev, kcontrol->private_value); 631 mutex_unlock(&dev->lock); 632 if (val < 0) 633 return val; 634 635 if (val & 0x8000) 636 value->value.integer.value[0] = 0; 637 else 638 value->value.integer.value[0] = 1; 639 640 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 641 (val & 0x8000) ? "muted " : "", 642 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 643 val, (int)kcontrol->private_value); 644 645 return 0; 646 } 647 648 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 649 650 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 651 char *name, int id) 652 { 653 int err; 654 char ctl_name[44]; 655 struct snd_kcontrol *kctl; 656 struct snd_kcontrol_new tmp; 657 658 memset (&tmp, 0, sizeof(tmp)); 659 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 660 tmp.private_value = id, 661 tmp.name = ctl_name, 662 663 /* Add Mute Control */ 664 sprintf(ctl_name, "%s Switch", name); 665 tmp.get = em28xx_vol_get_mute; 666 tmp.put = em28xx_vol_put_mute; 667 tmp.info = snd_ctl_boolean_mono_info; 668 kctl = snd_ctl_new1(&tmp, dev); 669 err = snd_ctl_add(card, kctl); 670 if (err < 0) 671 return err; 672 dprintk("Added control %s for ac97 volume control 0x%04x\n", 673 ctl_name, id); 674 675 memset (&tmp, 0, sizeof(tmp)); 676 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 677 tmp.private_value = id, 678 tmp.name = ctl_name, 679 680 /* Add Volume Control */ 681 sprintf(ctl_name, "%s Volume", name); 682 tmp.get = em28xx_vol_get; 683 tmp.put = em28xx_vol_put; 684 tmp.info = em28xx_vol_info; 685 tmp.tlv.p = em28xx_db_scale, 686 kctl = snd_ctl_new1(&tmp, dev); 687 err = snd_ctl_add(card, kctl); 688 if (err < 0) 689 return err; 690 dprintk("Added control %s for ac97 volume control 0x%04x\n", 691 ctl_name, id); 692 693 return 0; 694 } 695 696 /* 697 * register/unregister code and data 698 */ 699 static struct snd_pcm_ops snd_em28xx_pcm_capture = { 700 .open = snd_em28xx_capture_open, 701 .close = snd_em28xx_pcm_close, 702 .ioctl = snd_pcm_lib_ioctl, 703 .hw_params = snd_em28xx_hw_capture_params, 704 .hw_free = snd_em28xx_hw_capture_free, 705 .prepare = snd_em28xx_prepare, 706 .trigger = snd_em28xx_capture_trigger, 707 .pointer = snd_em28xx_capture_pointer, 708 .page = snd_pcm_get_vmalloc_page, 709 }; 710 711 static void em28xx_audio_free_urb(struct em28xx *dev) 712 { 713 int i; 714 715 for (i = 0; i < dev->adev.num_urb; i++) { 716 struct urb *urb = dev->adev.urb[i]; 717 718 if (!urb) 719 continue; 720 721 usb_free_coherent(dev->udev, urb->transfer_buffer_length, 722 dev->adev.transfer_buffer[i], 723 urb->transfer_dma); 724 725 usb_free_urb(urb); 726 } 727 kfree(dev->adev.urb); 728 kfree(dev->adev.transfer_buffer); 729 dev->adev.num_urb = 0; 730 } 731 732 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ 733 static int em28xx_audio_ep_packet_size(struct usb_device *udev, 734 struct usb_endpoint_descriptor *e) 735 { 736 int size = le16_to_cpu(e->wMaxPacketSize); 737 738 if (udev->speed == USB_SPEED_HIGH) 739 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); 740 741 return size & 0x7ff; 742 } 743 744 static int em28xx_audio_urb_init(struct em28xx *dev) 745 { 746 struct usb_interface *intf; 747 struct usb_endpoint_descriptor *e, *ep = NULL; 748 int i, ep_size, interval, num_urb, npackets; 749 int urb_size, bytes_per_transfer; 750 u8 alt; 751 752 if (dev->ifnum) 753 alt = 1; 754 else 755 alt = 7; 756 757 intf = usb_ifnum_to_if(dev->udev, dev->ifnum); 758 759 if (intf->num_altsetting <= alt) { 760 em28xx_errdev("alt %d doesn't exist on interface %d\n", 761 dev->ifnum, alt); 762 return -ENODEV; 763 } 764 765 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { 766 e = &intf->altsetting[alt].endpoint[i].desc; 767 if (!usb_endpoint_dir_in(e)) 768 continue; 769 if (e->bEndpointAddress == EM28XX_EP_AUDIO) { 770 ep = e; 771 break; 772 } 773 } 774 775 if (!ep) { 776 em28xx_errdev("Couldn't find an audio endpoint"); 777 return -ENODEV; 778 } 779 780 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep); 781 interval = 1 << (ep->bInterval - 1); 782 783 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", 784 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed), 785 dev->ifnum, alt, 786 interval, 787 ep_size); 788 789 /* Calculate the number and size of URBs to better fit the audio samples */ 790 791 /* 792 * Estimate the number of bytes per DMA transfer. 793 * 794 * This is given by the bit rate (for now, only 48000 Hz) multiplied 795 * by 2 channels and 2 bytes/sample divided by the number of microframe 796 * intervals and by the microframe rate (125 us) 797 */ 798 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); 799 800 /* 801 * Estimate the number of transfer URBs. Don't let it go past the 802 * maximum number of URBs that is known to be supported by the device. 803 */ 804 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); 805 if (num_urb > EM28XX_MAX_AUDIO_BUFS) 806 num_urb = EM28XX_MAX_AUDIO_BUFS; 807 808 /* 809 * Now that we know the number of bytes per transfer and the number of 810 * URBs, estimate the typical size of an URB, in order to adjust the 811 * minimal number of packets. 812 */ 813 urb_size = bytes_per_transfer / num_urb; 814 815 /* 816 * Now, calculate the amount of audio packets to be filled on each 817 * URB. In order to preserve the old behaviour, use a minimal 818 * threshold for this value. 819 */ 820 npackets = EM28XX_MIN_AUDIO_PACKETS; 821 if (urb_size > ep_size * npackets) 822 npackets = DIV_ROUND_UP(urb_size, ep_size); 823 824 em28xx_info("Number of URBs: %d, with %d packets and %d size", 825 num_urb, npackets, urb_size); 826 827 /* Estimate the bytes per period */ 828 dev->adev.period = urb_size * npackets; 829 830 /* Allocate space to store the number of URBs to be used */ 831 832 dev->adev.transfer_buffer = kcalloc(num_urb, 833 sizeof(*dev->adev.transfer_buffer), 834 GFP_ATOMIC); 835 if (!dev->adev.transfer_buffer) { 836 return -ENOMEM; 837 } 838 839 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC); 840 if (!dev->adev.urb) { 841 kfree(dev->adev.transfer_buffer); 842 return -ENOMEM; 843 } 844 845 /* Alloc memory for each URB and for each transfer buffer */ 846 dev->adev.num_urb = num_urb; 847 for (i = 0; i < num_urb; i++) { 848 struct urb *urb; 849 int j, k; 850 void *buf; 851 852 urb = usb_alloc_urb(npackets, GFP_ATOMIC); 853 if (!urb) { 854 em28xx_errdev("usb_alloc_urb failed!\n"); 855 em28xx_audio_free_urb(dev); 856 return -ENOMEM; 857 } 858 dev->adev.urb[i] = urb; 859 860 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC, 861 &urb->transfer_dma); 862 if (!buf) { 863 em28xx_errdev("usb_alloc_coherent failed!\n"); 864 em28xx_audio_free_urb(dev); 865 return -ENOMEM; 866 } 867 dev->adev.transfer_buffer[i] = buf; 868 869 urb->dev = dev->udev; 870 urb->context = dev; 871 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO); 872 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 873 urb->transfer_buffer = buf; 874 urb->interval = interval; 875 urb->complete = em28xx_audio_isocirq; 876 urb->number_of_packets = npackets; 877 urb->transfer_buffer_length = ep_size * npackets; 878 879 for (j = k = 0; j < npackets; j++, k += ep_size) { 880 urb->iso_frame_desc[j].offset = k; 881 urb->iso_frame_desc[j].length = ep_size; 882 } 883 } 884 885 return 0; 886 } 887 888 static int em28xx_audio_init(struct em28xx *dev) 889 { 890 struct em28xx_audio *adev = &dev->adev; 891 struct snd_pcm *pcm; 892 struct snd_card *card; 893 static int devnr; 894 int err; 895 896 if (!dev->has_alsa_audio) { 897 /* This device does not support the extension (in this case 898 the device is expecting the snd-usb-audio module or 899 doesn't have analog audio support at all) */ 900 return 0; 901 } 902 903 em28xx_info("Binding audio extension\n"); 904 905 kref_get(&dev->ref); 906 907 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " 908 "Rechberger\n"); 909 printk(KERN_INFO 910 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n"); 911 912 err = snd_card_new(&dev->udev->dev, index[devnr], "Em28xx Audio", 913 THIS_MODULE, 0, &card); 914 if (err < 0) 915 return err; 916 917 spin_lock_init(&adev->slock); 918 adev->sndcard = card; 919 adev->udev = dev->udev; 920 921 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 922 if (err < 0) 923 goto card_free; 924 925 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 926 pcm->info_flags = 0; 927 pcm->private_data = dev; 928 strcpy(pcm->name, "Empia 28xx Capture"); 929 930 strcpy(card->driver, "Em28xx-Audio"); 931 strcpy(card->shortname, "Em28xx Audio"); 932 strcpy(card->longname, "Empia Em28xx Audio"); 933 934 INIT_WORK(&adev->wq_trigger, audio_trigger); 935 936 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 937 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); 938 em28xx_cvol_new(card, dev, "Line In", AC97_LINE); 939 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); 940 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); 941 em28xx_cvol_new(card, dev, "CD", AC97_CD); 942 em28xx_cvol_new(card, dev, "AUX", AC97_AUX); 943 em28xx_cvol_new(card, dev, "PCM", AC97_PCM); 944 945 em28xx_cvol_new(card, dev, "Master", AC97_MASTER); 946 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); 947 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); 948 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); 949 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); 950 } 951 952 err = em28xx_audio_urb_init(dev); 953 if (err) 954 goto card_free; 955 956 err = snd_card_register(card); 957 if (err < 0) 958 goto urb_free; 959 960 em28xx_info("Audio extension successfully initialized\n"); 961 return 0; 962 963 urb_free: 964 em28xx_audio_free_urb(dev); 965 966 card_free: 967 snd_card_free(card); 968 adev->sndcard = NULL; 969 970 return err; 971 } 972 973 static int em28xx_audio_fini(struct em28xx *dev) 974 { 975 if (dev == NULL) 976 return 0; 977 978 if (!dev->has_alsa_audio) { 979 /* This device does not support the extension (in this case 980 the device is expecting the snd-usb-audio module or 981 doesn't have analog audio support at all) */ 982 return 0; 983 } 984 985 em28xx_info("Closing audio extension"); 986 987 if (dev->adev.sndcard) { 988 snd_card_disconnect(dev->adev.sndcard); 989 flush_work(&dev->adev.wq_trigger); 990 991 em28xx_audio_free_urb(dev); 992 993 snd_card_free(dev->adev.sndcard); 994 dev->adev.sndcard = NULL; 995 } 996 997 kref_put(&dev->ref, em28xx_free_device); 998 return 0; 999 } 1000 1001 static int em28xx_audio_suspend(struct em28xx *dev) 1002 { 1003 if (dev == NULL) 1004 return 0; 1005 1006 if (!dev->has_alsa_audio) 1007 return 0; 1008 1009 em28xx_info("Suspending audio extension"); 1010 em28xx_deinit_isoc_audio(dev); 1011 atomic_set(&dev->adev.stream_started, 0); 1012 return 0; 1013 } 1014 1015 static int em28xx_audio_resume(struct em28xx *dev) 1016 { 1017 if (dev == NULL) 1018 return 0; 1019 1020 if (!dev->has_alsa_audio) 1021 return 0; 1022 1023 em28xx_info("Resuming audio extension"); 1024 /* Nothing to do other than schedule_work() ?? */ 1025 schedule_work(&dev->adev.wq_trigger); 1026 return 0; 1027 } 1028 1029 static struct em28xx_ops audio_ops = { 1030 .id = EM28XX_AUDIO, 1031 .name = "Em28xx Audio Extension", 1032 .init = em28xx_audio_init, 1033 .fini = em28xx_audio_fini, 1034 .suspend = em28xx_audio_suspend, 1035 .resume = em28xx_audio_resume, 1036 }; 1037 1038 static int __init em28xx_alsa_register(void) 1039 { 1040 return em28xx_register_extension(&audio_ops); 1041 } 1042 1043 static void __exit em28xx_alsa_unregister(void) 1044 { 1045 em28xx_unregister_extension(&audio_ops); 1046 } 1047 1048 MODULE_LICENSE("GPL"); 1049 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 1050 MODULE_AUTHOR("Mauro Carvalho Chehab"); 1051 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); 1052 MODULE_VERSION(EM28XX_VERSION); 1053 1054 module_init(em28xx_alsa_register); 1055 module_exit(em28xx_alsa_unregister); 1056