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