1 /* 2 * Empiatech em28x1 audio extension 3 * 4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 5 * 6 * Copyright (C) 2007-2016 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 24 #include "em28xx.h" 25 26 #include <linux/kernel.h> 27 #include <linux/usb.h> 28 #include <linux/init.h> 29 #include <linux/sound.h> 30 #include <linux/spinlock.h> 31 #include <linux/soundcard.h> 32 #include <linux/slab.h> 33 #include <linux/vmalloc.h> 34 #include <linux/proc_fs.h> 35 #include <linux/module.h> 36 #include <sound/core.h> 37 #include <sound/pcm.h> 38 #include <sound/pcm_params.h> 39 #include <sound/info.h> 40 #include <sound/initval.h> 41 #include <sound/control.h> 42 #include <sound/tlv.h> 43 #include <sound/ac97_codec.h> 44 #include <media/v4l2-common.h> 45 46 static int debug; 47 module_param(debug, int, 0644); 48 MODULE_PARM_DESC(debug, "activates debug info"); 49 50 #define EM28XX_MAX_AUDIO_BUFS 5 51 #define EM28XX_MIN_AUDIO_PACKETS 64 52 53 #define dprintk(fmt, arg...) do { \ 54 if (debug) \ 55 dev_printk(KERN_DEBUG, &dev->intf->dev, \ 56 "video: %s: " fmt, __func__, ## arg); \ 57 } while (0) 58 59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 60 61 static int em28xx_deinit_isoc_audio(struct em28xx *dev) 62 { 63 int i; 64 65 dprintk("Stopping isoc\n"); 66 for (i = 0; i < dev->adev.num_urb; i++) { 67 struct urb *urb = dev->adev.urb[i]; 68 69 if (!irqs_disabled()) 70 usb_kill_urb(urb); 71 else 72 usb_unlink_urb(urb); 73 } 74 75 return 0; 76 } 77 78 static void em28xx_audio_isocirq(struct urb *urb) 79 { 80 struct em28xx *dev = urb->context; 81 int i; 82 unsigned int oldptr; 83 int period_elapsed = 0; 84 int status; 85 unsigned char *cp; 86 unsigned int stride; 87 struct snd_pcm_substream *substream; 88 struct snd_pcm_runtime *runtime; 89 90 if (dev->disconnected) { 91 dprintk("device disconnected while streaming. URB status=%d.\n", 92 urb->status); 93 atomic_set(&dev->adev.stream_started, 0); 94 return; 95 } 96 97 switch (urb->status) { 98 case 0: /* success */ 99 case -ETIMEDOUT: /* NAK */ 100 break; 101 case -ECONNRESET: /* kill */ 102 case -ENOENT: 103 case -ESHUTDOWN: 104 return; 105 default: /* error */ 106 dprintk("urb completition error %d.\n", urb->status); 107 break; 108 } 109 110 if (atomic_read(&dev->adev.stream_started) == 0) 111 return; 112 113 if (dev->adev.capture_pcm_substream) { 114 substream = dev->adev.capture_pcm_substream; 115 runtime = substream->runtime; 116 stride = runtime->frame_bits >> 3; 117 118 for (i = 0; i < urb->number_of_packets; i++) { 119 int length = 120 urb->iso_frame_desc[i].actual_length / stride; 121 cp = (unsigned char *)urb->transfer_buffer + 122 urb->iso_frame_desc[i].offset; 123 124 if (!length) 125 continue; 126 127 oldptr = dev->adev.hwptr_done_capture; 128 if (oldptr + length >= runtime->buffer_size) { 129 unsigned int cnt = 130 runtime->buffer_size - oldptr; 131 memcpy(runtime->dma_area + oldptr * stride, cp, 132 cnt * stride); 133 memcpy(runtime->dma_area, cp + cnt * stride, 134 length * stride - cnt * stride); 135 } else { 136 memcpy(runtime->dma_area + oldptr * stride, cp, 137 length * stride); 138 } 139 140 snd_pcm_stream_lock(substream); 141 142 dev->adev.hwptr_done_capture += length; 143 if (dev->adev.hwptr_done_capture >= 144 runtime->buffer_size) 145 dev->adev.hwptr_done_capture -= 146 runtime->buffer_size; 147 148 dev->adev.capture_transfer_done += length; 149 if (dev->adev.capture_transfer_done >= 150 runtime->period_size) { 151 dev->adev.capture_transfer_done -= 152 runtime->period_size; 153 period_elapsed = 1; 154 } 155 156 snd_pcm_stream_unlock(substream); 157 } 158 if (period_elapsed) 159 snd_pcm_period_elapsed(substream); 160 } 161 urb->status = 0; 162 163 status = usb_submit_urb(urb, GFP_ATOMIC); 164 if (status < 0) 165 dev_err(&dev->intf->dev, 166 "resubmit of audio urb failed (error=%i)\n", 167 status); 168 return; 169 } 170 171 static int em28xx_init_audio_isoc(struct em28xx *dev) 172 { 173 int i, errCode; 174 175 dprintk("Starting isoc transfers\n"); 176 177 /* Start streaming */ 178 for (i = 0; i < dev->adev.num_urb; i++) { 179 memset(dev->adev.transfer_buffer[i], 0x80, 180 dev->adev.urb[i]->transfer_buffer_length); 181 182 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 183 if (errCode) { 184 dev_err(&dev->intf->dev, 185 "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 em28xx *dev = snd_pcm_substream_chip(subs); 201 struct snd_pcm_runtime *runtime = subs->runtime; 202 203 dprintk("Allocating vbuffer\n"); 204 if (runtime->dma_area) { 205 if (runtime->dma_bytes > size) 206 return 0; 207 208 vfree(runtime->dma_area); 209 } 210 runtime->dma_area = vmalloc(size); 211 if (!runtime->dma_area) 212 return -ENOMEM; 213 214 runtime->dma_bytes = size; 215 216 return 0; 217 } 218 219 static struct snd_pcm_hardware snd_em28xx_hw_capture = { 220 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 221 SNDRV_PCM_INFO_MMAP | 222 SNDRV_PCM_INFO_INTERLEAVED | 223 SNDRV_PCM_INFO_BATCH | 224 SNDRV_PCM_INFO_MMAP_VALID, 225 226 .formats = SNDRV_PCM_FMTBIT_S16_LE, 227 228 .rates = SNDRV_PCM_RATE_48000, 229 230 .rate_min = 48000, 231 .rate_max = 48000, 232 .channels_min = 2, 233 .channels_max = 2, 234 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 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 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n"); 259 return -ENODEV; 260 } 261 262 if (dev->disconnected) 263 return -ENODEV; 264 265 dprintk("opening device and trying to acquire exclusive lock\n"); 266 267 nonblock = !!(substream->f_flags & O_NONBLOCK); 268 if (nonblock) { 269 if (!mutex_trylock(&dev->lock)) 270 return -EAGAIN; 271 } else 272 mutex_lock(&dev->lock); 273 274 runtime->hw = snd_em28xx_hw_capture; 275 276 if (dev->adev.users == 0) { 277 if (dev->alt == 0 || dev->is_audio_only) { 278 struct usb_device *udev = interface_to_usbdev(dev->intf); 279 280 if (dev->is_audio_only) 281 /* audio is on a separate interface */ 282 dev->alt = 1; 283 else 284 /* audio is on the same interface as video */ 285 dev->alt = 7; 286 /* 287 * FIXME: The intention seems to be to select 288 * the alt setting with the largest 289 * wMaxPacketSize for the video endpoint. 290 * At least dev->alt should be used instead, but 291 * we should probably not touch it at all if it 292 * is already >0, because wMaxPacketSize of the 293 * audio endpoints seems to be the same for all. 294 */ 295 dprintk("changing alternate number on interface %d to %d\n", 296 dev->ifnum, dev->alt); 297 usb_set_interface(udev, dev->ifnum, dev->alt); 298 } 299 300 /* Sets volume, mute, etc */ 301 dev->mute = 0; 302 ret = em28xx_audio_analog_set(dev); 303 if (ret < 0) 304 goto err; 305 } 306 307 kref_get(&dev->ref); 308 dev->adev.users++; 309 mutex_unlock(&dev->lock); 310 311 /* Dynamically adjust the period size */ 312 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 313 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 314 dev->adev.period * 95 / 100, 315 dev->adev.period * 105 / 100); 316 317 dev->adev.capture_pcm_substream = substream; 318 319 return 0; 320 err: 321 mutex_unlock(&dev->lock); 322 323 dev_err(&dev->intf->dev, 324 "Error while configuring em28xx mixer\n"); 325 return ret; 326 } 327 328 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 329 { 330 struct em28xx *dev = snd_pcm_substream_chip(substream); 331 332 dprintk("closing device\n"); 333 334 dev->mute = 1; 335 mutex_lock(&dev->lock); 336 dev->adev.users--; 337 if (atomic_read(&dev->adev.stream_started) > 0) { 338 atomic_set(&dev->adev.stream_started, 0); 339 schedule_work(&dev->adev.wq_trigger); 340 } 341 342 em28xx_audio_analog_set(dev); 343 if (substream->runtime->dma_area) { 344 dprintk("freeing\n"); 345 vfree(substream->runtime->dma_area); 346 substream->runtime->dma_area = NULL; 347 } 348 mutex_unlock(&dev->lock); 349 kref_put(&dev->ref, em28xx_free_device); 350 351 return 0; 352 } 353 354 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 355 struct snd_pcm_hw_params *hw_params) 356 { 357 int ret; 358 struct em28xx *dev = snd_pcm_substream_chip(substream); 359 360 if (dev->disconnected) 361 return -ENODEV; 362 363 dprintk("Setting capture parameters\n"); 364 365 ret = snd_pcm_alloc_vmalloc_buffer(substream, 366 params_buffer_bytes(hw_params)); 367 if (ret < 0) 368 return ret; 369 #if 0 370 /* TODO: set up em28xx audio chip to deliver the correct audio format, 371 current default is 48000hz multiplexed => 96000hz mono 372 which shouldn't matter since analogue TV only supports mono */ 373 unsigned int channels, rate, format; 374 375 format = params_format(hw_params); 376 rate = params_rate(hw_params); 377 channels = params_channels(hw_params); 378 #endif 379 380 return 0; 381 } 382 383 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 384 { 385 struct em28xx *dev = snd_pcm_substream_chip(substream); 386 struct em28xx_audio *adev = &dev->adev; 387 388 dprintk("Stop capture, if needed\n"); 389 390 if (atomic_read(&adev->stream_started) > 0) { 391 atomic_set(&adev->stream_started, 0); 392 schedule_work(&adev->wq_trigger); 393 } 394 395 return 0; 396 } 397 398 static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 399 { 400 struct em28xx *dev = snd_pcm_substream_chip(substream); 401 402 if (dev->disconnected) 403 return -ENODEV; 404 405 dev->adev.hwptr_done_capture = 0; 406 dev->adev.capture_transfer_done = 0; 407 408 return 0; 409 } 410 411 static void audio_trigger(struct work_struct *work) 412 { 413 struct em28xx_audio *adev = 414 container_of(work, struct em28xx_audio, wq_trigger); 415 struct em28xx *dev = container_of(adev, struct em28xx, adev); 416 417 if (atomic_read(&adev->stream_started)) { 418 dprintk("starting capture"); 419 em28xx_init_audio_isoc(dev); 420 } else { 421 dprintk("stopping capture"); 422 em28xx_deinit_isoc_audio(dev); 423 } 424 } 425 426 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 427 int cmd) 428 { 429 struct em28xx *dev = snd_pcm_substream_chip(substream); 430 int retval = 0; 431 432 if (dev->disconnected) 433 return -ENODEV; 434 435 switch (cmd) { 436 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 437 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 438 case SNDRV_PCM_TRIGGER_START: 439 atomic_set(&dev->adev.stream_started, 1); 440 break; 441 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 442 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 443 case SNDRV_PCM_TRIGGER_STOP: 444 atomic_set(&dev->adev.stream_started, 0); 445 break; 446 default: 447 retval = -EINVAL; 448 } 449 schedule_work(&dev->adev.wq_trigger); 450 return retval; 451 } 452 453 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 454 *substream) 455 { 456 unsigned long flags; 457 struct em28xx *dev; 458 snd_pcm_uframes_t hwptr_done; 459 460 dev = snd_pcm_substream_chip(substream); 461 if (dev->disconnected) 462 return SNDRV_PCM_POS_XRUN; 463 464 spin_lock_irqsave(&dev->adev.slock, flags); 465 hwptr_done = dev->adev.hwptr_done_capture; 466 spin_unlock_irqrestore(&dev->adev.slock, flags); 467 468 return hwptr_done; 469 } 470 471 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 472 unsigned long offset) 473 { 474 void *pageptr = subs->runtime->dma_area + offset; 475 476 return vmalloc_to_page(pageptr); 477 } 478 479 /* 480 * AC97 volume control support 481 */ 482 static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 483 struct snd_ctl_elem_info *info) 484 { 485 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 486 487 if (dev->disconnected) 488 return -ENODEV; 489 490 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 491 info->count = 2; 492 info->value.integer.min = 0; 493 info->value.integer.max = 0x1f; 494 495 return 0; 496 } 497 498 static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 499 struct snd_ctl_elem_value *value) 500 { 501 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 502 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 503 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 504 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 505 int nonblock = 0; 506 int rc; 507 508 if (dev->disconnected) 509 return -ENODEV; 510 511 if (substream) 512 nonblock = !!(substream->f_flags & O_NONBLOCK); 513 if (nonblock) { 514 if (!mutex_trylock(&dev->lock)) 515 return -EAGAIN; 516 } else 517 mutex_lock(&dev->lock); 518 rc = em28xx_read_ac97(dev, kcontrol->private_value); 519 if (rc < 0) 520 goto err; 521 522 val |= rc & 0x8000; /* Preserve the mute flag */ 523 524 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 525 if (rc < 0) 526 goto err; 527 528 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 529 (val & 0x8000) ? "muted " : "", 530 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 531 val, (int)kcontrol->private_value); 532 533 err: 534 mutex_unlock(&dev->lock); 535 return rc; 536 } 537 538 static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 539 struct snd_ctl_elem_value *value) 540 { 541 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 542 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 543 int nonblock = 0; 544 int val; 545 546 if (dev->disconnected) 547 return -ENODEV; 548 549 if (substream) 550 nonblock = !!(substream->f_flags & O_NONBLOCK); 551 if (nonblock) { 552 if (!mutex_trylock(&dev->lock)) 553 return -EAGAIN; 554 } else 555 mutex_lock(&dev->lock); 556 val = em28xx_read_ac97(dev, kcontrol->private_value); 557 mutex_unlock(&dev->lock); 558 if (val < 0) 559 return val; 560 561 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 562 (val & 0x8000) ? "muted " : "", 563 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 564 val, (int)kcontrol->private_value); 565 566 value->value.integer.value[0] = 0x1f - (val & 0x1f); 567 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); 568 569 return 0; 570 } 571 572 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 573 struct snd_ctl_elem_value *value) 574 { 575 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 576 u16 val = value->value.integer.value[0]; 577 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 578 int nonblock = 0; 579 int rc; 580 581 if (dev->disconnected) 582 return -ENODEV; 583 584 if (substream) 585 nonblock = !!(substream->f_flags & O_NONBLOCK); 586 if (nonblock) { 587 if (!mutex_trylock(&dev->lock)) 588 return -EAGAIN; 589 } else 590 mutex_lock(&dev->lock); 591 rc = em28xx_read_ac97(dev, kcontrol->private_value); 592 if (rc < 0) 593 goto err; 594 595 if (val) 596 rc &= 0x1f1f; 597 else 598 rc |= 0x8000; 599 600 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 601 if (rc < 0) 602 goto err; 603 604 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 605 (val & 0x8000) ? "muted " : "", 606 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 607 val, (int)kcontrol->private_value); 608 609 err: 610 mutex_unlock(&dev->lock); 611 return rc; 612 } 613 614 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 615 struct snd_ctl_elem_value *value) 616 { 617 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 618 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 619 int nonblock = 0; 620 int val; 621 622 if (dev->disconnected) 623 return -ENODEV; 624 625 if (substream) 626 nonblock = !!(substream->f_flags & O_NONBLOCK); 627 if (nonblock) { 628 if (!mutex_trylock(&dev->lock)) 629 return -EAGAIN; 630 } else 631 mutex_lock(&dev->lock); 632 val = em28xx_read_ac97(dev, kcontrol->private_value); 633 mutex_unlock(&dev->lock); 634 if (val < 0) 635 return val; 636 637 if (val & 0x8000) 638 value->value.integer.value[0] = 0; 639 else 640 value->value.integer.value[0] = 1; 641 642 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 643 (val & 0x8000) ? "muted " : "", 644 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 645 val, (int)kcontrol->private_value); 646 647 return 0; 648 } 649 650 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 651 652 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 653 char *name, int id) 654 { 655 int err; 656 char ctl_name[44]; 657 struct snd_kcontrol *kctl; 658 struct snd_kcontrol_new tmp; 659 660 memset(&tmp, 0, sizeof(tmp)); 661 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 662 tmp.private_value = id, 663 tmp.name = ctl_name, 664 665 /* Add Mute Control */ 666 sprintf(ctl_name, "%s Switch", name); 667 tmp.get = em28xx_vol_get_mute; 668 tmp.put = em28xx_vol_put_mute; 669 tmp.info = snd_ctl_boolean_mono_info; 670 kctl = snd_ctl_new1(&tmp, dev); 671 err = snd_ctl_add(card, kctl); 672 if (err < 0) 673 return err; 674 dprintk("Added control %s for ac97 volume control 0x%04x\n", 675 ctl_name, id); 676 677 memset(&tmp, 0, sizeof(tmp)); 678 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 679 tmp.private_value = id, 680 tmp.name = ctl_name, 681 682 /* Add Volume Control */ 683 sprintf(ctl_name, "%s Volume", name); 684 tmp.get = em28xx_vol_get; 685 tmp.put = em28xx_vol_put; 686 tmp.info = em28xx_vol_info; 687 tmp.tlv.p = em28xx_db_scale, 688 kctl = snd_ctl_new1(&tmp, dev); 689 err = snd_ctl_add(card, kctl); 690 if (err < 0) 691 return err; 692 dprintk("Added control %s for ac97 volume control 0x%04x\n", 693 ctl_name, id); 694 695 return 0; 696 } 697 698 /* 699 * register/unregister code and data 700 */ 701 static const struct snd_pcm_ops snd_em28xx_pcm_capture = { 702 .open = snd_em28xx_capture_open, 703 .close = snd_em28xx_pcm_close, 704 .ioctl = snd_pcm_lib_ioctl, 705 .hw_params = snd_em28xx_hw_capture_params, 706 .hw_free = snd_em28xx_hw_capture_free, 707 .prepare = snd_em28xx_prepare, 708 .trigger = snd_em28xx_capture_trigger, 709 .pointer = snd_em28xx_capture_pointer, 710 .page = snd_pcm_get_vmalloc_page, 711 }; 712 713 static void em28xx_audio_free_urb(struct em28xx *dev) 714 { 715 struct usb_device *udev = interface_to_usbdev(dev->intf); 716 int i; 717 718 for (i = 0; i < dev->adev.num_urb; i++) { 719 struct urb *urb = dev->adev.urb[i]; 720 721 if (!urb) 722 continue; 723 724 usb_free_coherent(udev, urb->transfer_buffer_length, 725 dev->adev.transfer_buffer[i], 726 urb->transfer_dma); 727 728 usb_free_urb(urb); 729 } 730 kfree(dev->adev.urb); 731 kfree(dev->adev.transfer_buffer); 732 dev->adev.num_urb = 0; 733 } 734 735 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ 736 static int em28xx_audio_ep_packet_size(struct usb_device *udev, 737 struct usb_endpoint_descriptor *e) 738 { 739 int size = le16_to_cpu(e->wMaxPacketSize); 740 741 if (udev->speed == USB_SPEED_HIGH) 742 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); 743 744 return size & 0x7ff; 745 } 746 747 static int em28xx_audio_urb_init(struct em28xx *dev) 748 { 749 struct usb_interface *intf; 750 struct usb_endpoint_descriptor *e, *ep = NULL; 751 struct usb_device *udev = interface_to_usbdev(dev->intf); 752 int i, ep_size, interval, num_urb, npackets; 753 int urb_size, bytes_per_transfer; 754 u8 alt; 755 756 if (dev->ifnum) 757 alt = 1; 758 else 759 alt = 7; 760 761 intf = usb_ifnum_to_if(udev, dev->ifnum); 762 763 if (intf->num_altsetting <= alt) { 764 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n", 765 dev->ifnum, alt); 766 return -ENODEV; 767 } 768 769 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { 770 e = &intf->altsetting[alt].endpoint[i].desc; 771 if (!usb_endpoint_dir_in(e)) 772 continue; 773 if (e->bEndpointAddress == EM28XX_EP_AUDIO) { 774 ep = e; 775 break; 776 } 777 } 778 779 if (!ep) { 780 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint"); 781 return -ENODEV; 782 } 783 784 ep_size = em28xx_audio_ep_packet_size(udev, ep); 785 interval = 1 << (ep->bInterval - 1); 786 787 dev_info(&dev->intf->dev, 788 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", 789 EM28XX_EP_AUDIO, usb_speed_string(udev->speed), 790 dev->ifnum, alt, interval, ep_size); 791 792 /* Calculate the number and size of URBs to better fit the audio samples */ 793 794 /* 795 * Estimate the number of bytes per DMA transfer. 796 * 797 * This is given by the bit rate (for now, only 48000 Hz) multiplied 798 * by 2 channels and 2 bytes/sample divided by the number of microframe 799 * intervals and by the microframe rate (125 us) 800 */ 801 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); 802 803 /* 804 * Estimate the number of transfer URBs. Don't let it go past the 805 * maximum number of URBs that is known to be supported by the device. 806 */ 807 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); 808 if (num_urb > EM28XX_MAX_AUDIO_BUFS) 809 num_urb = EM28XX_MAX_AUDIO_BUFS; 810 811 /* 812 * Now that we know the number of bytes per transfer and the number of 813 * URBs, estimate the typical size of an URB, in order to adjust the 814 * minimal number of packets. 815 */ 816 urb_size = bytes_per_transfer / num_urb; 817 818 /* 819 * Now, calculate the amount of audio packets to be filled on each 820 * URB. In order to preserve the old behaviour, use a minimal 821 * threshold for this value. 822 */ 823 npackets = EM28XX_MIN_AUDIO_PACKETS; 824 if (urb_size > ep_size * npackets) 825 npackets = DIV_ROUND_UP(urb_size, ep_size); 826 827 dev_info(&dev->intf->dev, 828 "Number of URBs: %d, with %d packets and %d size\n", 829 num_urb, npackets, urb_size); 830 831 /* Estimate the bytes per period */ 832 dev->adev.period = urb_size * npackets; 833 834 /* Allocate space to store the number of URBs to be used */ 835 836 dev->adev.transfer_buffer = kcalloc(num_urb, 837 sizeof(*dev->adev.transfer_buffer), 838 GFP_ATOMIC); 839 if (!dev->adev.transfer_buffer) { 840 return -ENOMEM; 841 } 842 843 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC); 844 if (!dev->adev.urb) { 845 kfree(dev->adev.transfer_buffer); 846 return -ENOMEM; 847 } 848 849 /* Alloc memory for each URB and for each transfer buffer */ 850 dev->adev.num_urb = num_urb; 851 for (i = 0; i < num_urb; i++) { 852 struct urb *urb; 853 int j, k; 854 void *buf; 855 856 urb = usb_alloc_urb(npackets, GFP_ATOMIC); 857 if (!urb) { 858 em28xx_audio_free_urb(dev); 859 return -ENOMEM; 860 } 861 dev->adev.urb[i] = urb; 862 863 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC, 864 &urb->transfer_dma); 865 if (!buf) { 866 dev_err(&dev->intf->dev, 867 "usb_alloc_coherent failed!\n"); 868 em28xx_audio_free_urb(dev); 869 return -ENOMEM; 870 } 871 dev->adev.transfer_buffer[i] = buf; 872 873 urb->dev = udev; 874 urb->context = dev; 875 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO); 876 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 877 urb->transfer_buffer = buf; 878 urb->interval = interval; 879 urb->complete = em28xx_audio_isocirq; 880 urb->number_of_packets = npackets; 881 urb->transfer_buffer_length = ep_size * npackets; 882 883 for (j = k = 0; j < npackets; j++, k += ep_size) { 884 urb->iso_frame_desc[j].offset = k; 885 urb->iso_frame_desc[j].length = ep_size; 886 } 887 } 888 889 return 0; 890 } 891 892 static int em28xx_audio_init(struct em28xx *dev) 893 { 894 struct em28xx_audio *adev = &dev->adev; 895 struct usb_device *udev = interface_to_usbdev(dev->intf); 896 struct snd_pcm *pcm; 897 struct snd_card *card; 898 static int devnr; 899 int err; 900 901 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 902 /* This device does not support the extension (in this case 903 the device is expecting the snd-usb-audio module or 904 doesn't have analog audio support at all) */ 905 return 0; 906 } 907 908 dev_info(&dev->intf->dev, "Binding audio extension\n"); 909 910 kref_get(&dev->ref); 911 912 dev_info(&dev->intf->dev, 913 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n"); 914 dev_info(&dev->intf->dev, 915 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n"); 916 917 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio", 918 THIS_MODULE, 0, &card); 919 if (err < 0) 920 return err; 921 922 spin_lock_init(&adev->slock); 923 adev->sndcard = card; 924 adev->udev = udev; 925 926 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 927 if (err < 0) 928 goto card_free; 929 930 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 931 pcm->info_flags = 0; 932 pcm->private_data = dev; 933 strcpy(pcm->name, "Empia 28xx Capture"); 934 935 strcpy(card->driver, "Em28xx-Audio"); 936 strcpy(card->shortname, "Em28xx Audio"); 937 strcpy(card->longname, "Empia Em28xx Audio"); 938 939 INIT_WORK(&adev->wq_trigger, audio_trigger); 940 941 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 942 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); 943 em28xx_cvol_new(card, dev, "Line In", AC97_LINE); 944 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); 945 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); 946 em28xx_cvol_new(card, dev, "CD", AC97_CD); 947 em28xx_cvol_new(card, dev, "AUX", AC97_AUX); 948 em28xx_cvol_new(card, dev, "PCM", AC97_PCM); 949 950 em28xx_cvol_new(card, dev, "Master", AC97_MASTER); 951 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); 952 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); 953 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); 954 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); 955 } 956 957 err = em28xx_audio_urb_init(dev); 958 if (err) 959 goto card_free; 960 961 err = snd_card_register(card); 962 if (err < 0) 963 goto urb_free; 964 965 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n"); 966 return 0; 967 968 urb_free: 969 em28xx_audio_free_urb(dev); 970 971 card_free: 972 snd_card_free(card); 973 adev->sndcard = NULL; 974 975 return err; 976 } 977 978 static int em28xx_audio_fini(struct em28xx *dev) 979 { 980 if (dev == NULL) 981 return 0; 982 983 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 984 /* This device does not support the extension (in this case 985 the device is expecting the snd-usb-audio module or 986 doesn't have analog audio support at all) */ 987 return 0; 988 } 989 990 dev_info(&dev->intf->dev, "Closing audio extension\n"); 991 992 if (dev->adev.sndcard) { 993 snd_card_disconnect(dev->adev.sndcard); 994 flush_work(&dev->adev.wq_trigger); 995 996 em28xx_audio_free_urb(dev); 997 998 snd_card_free(dev->adev.sndcard); 999 dev->adev.sndcard = NULL; 1000 } 1001 1002 kref_put(&dev->ref, em28xx_free_device); 1003 return 0; 1004 } 1005 1006 static int em28xx_audio_suspend(struct em28xx *dev) 1007 { 1008 if (dev == NULL) 1009 return 0; 1010 1011 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1012 return 0; 1013 1014 dev_info(&dev->intf->dev, "Suspending audio extension\n"); 1015 em28xx_deinit_isoc_audio(dev); 1016 atomic_set(&dev->adev.stream_started, 0); 1017 return 0; 1018 } 1019 1020 static int em28xx_audio_resume(struct em28xx *dev) 1021 { 1022 if (dev == NULL) 1023 return 0; 1024 1025 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1026 return 0; 1027 1028 dev_info(&dev->intf->dev, "Resuming audio extension\n"); 1029 /* Nothing to do other than schedule_work() ?? */ 1030 schedule_work(&dev->adev.wq_trigger); 1031 return 0; 1032 } 1033 1034 static struct em28xx_ops audio_ops = { 1035 .id = EM28XX_AUDIO, 1036 .name = "Em28xx Audio Extension", 1037 .init = em28xx_audio_init, 1038 .fini = em28xx_audio_fini, 1039 .suspend = em28xx_audio_suspend, 1040 .resume = em28xx_audio_resume, 1041 }; 1042 1043 static int __init em28xx_alsa_register(void) 1044 { 1045 return em28xx_register_extension(&audio_ops); 1046 } 1047 1048 static void __exit em28xx_alsa_unregister(void) 1049 { 1050 em28xx_unregister_extension(&audio_ops); 1051 } 1052 1053 MODULE_LICENSE("GPL"); 1054 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 1055 MODULE_AUTHOR("Mauro Carvalho Chehab"); 1056 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); 1057 MODULE_VERSION(EM28XX_VERSION); 1058 1059 module_init(em28xx_alsa_register); 1060 module_exit(em28xx_alsa_unregister); 1061