1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // Empiatech em28x1 audio extension 4 // 5 // Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> 6 // 7 // Copyright (C) 2007-2016 Mauro Carvalho Chehab 8 // - Port to work with the in-kernel driver 9 // - Cleanups, fixes, alsa-controls, etc. 10 // 11 // This driver is based on my previous au600 usb pstn audio driver 12 // and inherits all the copyrights 13 // 14 // This program is free software; you can redistribute it and/or modify 15 // it under the terms of the GNU General Public License as published by 16 // the Free Software Foundation; either version 2 of the License, or 17 // (at your option) any later version. 18 // 19 // This program is distributed in the hope that it will be useful, 20 // but WITHOUT ANY WARRANTY; without even the implied warranty of 21 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 // GNU General Public License for more details. 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/module.h> 35 #include <sound/core.h> 36 #include <sound/pcm.h> 37 #include <sound/pcm_params.h> 38 #include <sound/info.h> 39 #include <sound/initval.h> 40 #include <sound/control.h> 41 #include <sound/tlv.h> 42 #include <sound/ac97_codec.h> 43 #include <media/v4l2-common.h> 44 45 static int debug; 46 module_param(debug, int, 0644); 47 MODULE_PARM_DESC(debug, "activates debug info"); 48 49 #define EM28XX_MAX_AUDIO_BUFS 5 50 #define EM28XX_MIN_AUDIO_PACKETS 64 51 52 #define dprintk(fmt, arg...) do { \ 53 if (debug) \ 54 dev_printk(KERN_DEBUG, &dev->intf->dev, \ 55 "video: %s: " fmt, __func__, ## arg); \ 56 } while (0) 57 58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 59 60 static int em28xx_deinit_isoc_audio(struct em28xx *dev) 61 { 62 int i; 63 64 dprintk("Stopping isoc\n"); 65 for (i = 0; i < dev->adev.num_urb; i++) { 66 struct urb *urb = dev->adev.urb[i]; 67 68 if (!irqs_disabled()) 69 usb_kill_urb(urb); 70 else 71 usb_unlink_urb(urb); 72 } 73 74 return 0; 75 } 76 77 static void em28xx_audio_isocirq(struct urb *urb) 78 { 79 struct em28xx *dev = urb->context; 80 int i; 81 unsigned int oldptr; 82 int period_elapsed = 0; 83 int status; 84 unsigned char *cp; 85 unsigned int stride; 86 struct snd_pcm_substream *substream; 87 struct snd_pcm_runtime *runtime; 88 89 if (dev->disconnected) { 90 dprintk("device disconnected while streaming. URB status=%d.\n", 91 urb->status); 92 atomic_set(&dev->adev.stream_started, 0); 93 return; 94 } 95 96 switch (urb->status) { 97 case 0: /* success */ 98 case -ETIMEDOUT: /* NAK */ 99 break; 100 case -ECONNRESET: /* kill */ 101 case -ENOENT: 102 case -ESHUTDOWN: 103 return; 104 default: /* error */ 105 dprintk("urb completion error %d.\n", urb->status); 106 break; 107 } 108 109 if (atomic_read(&dev->adev.stream_started) == 0) 110 return; 111 112 if (dev->adev.capture_pcm_substream) { 113 substream = dev->adev.capture_pcm_substream; 114 runtime = substream->runtime; 115 stride = runtime->frame_bits >> 3; 116 117 for (i = 0; i < urb->number_of_packets; i++) { 118 unsigned long flags; 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_irqsave(substream, flags); 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_irqrestore(substream, flags); 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 } 169 170 static int em28xx_init_audio_isoc(struct em28xx *dev) 171 { 172 int i, err; 173 174 dprintk("Starting isoc transfers\n"); 175 176 /* Start streaming */ 177 for (i = 0; i < dev->adev.num_urb; i++) { 178 memset(dev->adev.transfer_buffer[i], 0x80, 179 dev->adev.urb[i]->transfer_buffer_length); 180 181 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); 182 if (err) { 183 dev_err(&dev->intf->dev, 184 "submit of audio urb failed (error=%i)\n", 185 err); 186 em28xx_deinit_isoc_audio(dev); 187 atomic_set(&dev->adev.stream_started, 0); 188 return err; 189 } 190 } 191 192 return 0; 193 } 194 195 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, 196 size_t size) 197 { 198 struct em28xx *dev = snd_pcm_substream_chip(subs); 199 struct snd_pcm_runtime *runtime = subs->runtime; 200 201 dprintk("Allocating vbuffer\n"); 202 if (runtime->dma_area) { 203 if (runtime->dma_bytes > size) 204 return 0; 205 206 vfree(runtime->dma_area); 207 } 208 runtime->dma_area = vmalloc(size); 209 if (!runtime->dma_area) 210 return -ENOMEM; 211 212 runtime->dma_bytes = size; 213 214 return 0; 215 } 216 217 static const struct snd_pcm_hardware snd_em28xx_hw_capture = { 218 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | 219 SNDRV_PCM_INFO_MMAP | 220 SNDRV_PCM_INFO_INTERLEAVED | 221 SNDRV_PCM_INFO_BATCH | 222 SNDRV_PCM_INFO_MMAP_VALID, 223 224 .formats = SNDRV_PCM_FMTBIT_S16_LE, 225 226 .rates = SNDRV_PCM_RATE_48000, 227 228 .rate_min = 48000, 229 .rate_max = 48000, 230 .channels_min = 2, 231 .channels_max = 2, 232 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ 233 234 /* 235 * The period is 12.288 bytes. Allow a 10% of variation along its 236 * value, in order to avoid overruns/underruns due to some clock 237 * drift. 238 * 239 * FIXME: This period assumes 64 packets, and a 48000 PCM rate. 240 * Calculate it dynamically. 241 */ 242 .period_bytes_min = 11059, 243 .period_bytes_max = 13516, 244 245 .periods_min = 2, 246 .periods_max = 98, /* 12544, */ 247 }; 248 249 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) 250 { 251 struct em28xx *dev = snd_pcm_substream_chip(substream); 252 struct snd_pcm_runtime *runtime = substream->runtime; 253 int nonblock, ret = 0; 254 255 if (!dev) { 256 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n"); 257 return -ENODEV; 258 } 259 260 if (dev->disconnected) 261 return -ENODEV; 262 263 dprintk("opening device and trying to acquire exclusive lock\n"); 264 265 nonblock = !!(substream->f_flags & O_NONBLOCK); 266 if (nonblock) { 267 if (!mutex_trylock(&dev->lock)) 268 return -EAGAIN; 269 } else { 270 mutex_lock(&dev->lock); 271 } 272 273 runtime->hw = snd_em28xx_hw_capture; 274 275 if (dev->adev.users == 0) { 276 if (!dev->alt || dev->is_audio_only) { 277 struct usb_device *udev; 278 279 udev = interface_to_usbdev(dev->intf); 280 281 if (dev->is_audio_only) 282 /* audio is on a separate interface */ 283 dev->alt = 1; 284 else 285 /* audio is on the same interface as video */ 286 dev->alt = 7; 287 /* 288 * FIXME: The intention seems to be to select 289 * the alt setting with the largest 290 * wMaxPacketSize for the video endpoint. 291 * At least dev->alt should be used instead, but 292 * we should probably not touch it at all if it 293 * is already >0, because wMaxPacketSize of the 294 * audio endpoints seems to be the same for all. 295 */ 296 dprintk("changing alternate number on interface %d to %d\n", 297 dev->ifnum, dev->alt); 298 usb_set_interface(udev, dev->ifnum, dev->alt); 299 } 300 301 /* Sets volume, mute, etc */ 302 dev->mute = 0; 303 ret = em28xx_audio_analog_set(dev); 304 if (ret < 0) 305 goto err; 306 } 307 308 kref_get(&dev->ref); 309 dev->adev.users++; 310 mutex_unlock(&dev->lock); 311 312 /* Dynamically adjust the period size */ 313 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 314 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 315 dev->adev.period * 95 / 100, 316 dev->adev.period * 105 / 100); 317 318 dev->adev.capture_pcm_substream = substream; 319 320 return 0; 321 err: 322 mutex_unlock(&dev->lock); 323 324 dev_err(&dev->intf->dev, 325 "Error while configuring em28xx mixer\n"); 326 return ret; 327 } 328 329 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) 330 { 331 struct em28xx *dev = snd_pcm_substream_chip(substream); 332 333 dprintk("closing device\n"); 334 335 dev->mute = 1; 336 mutex_lock(&dev->lock); 337 dev->adev.users--; 338 if (atomic_read(&dev->adev.stream_started) > 0) { 339 atomic_set(&dev->adev.stream_started, 0); 340 schedule_work(&dev->adev.wq_trigger); 341 } 342 343 em28xx_audio_analog_set(dev); 344 if (substream->runtime->dma_area) { 345 dprintk("freeing\n"); 346 vfree(substream->runtime->dma_area); 347 substream->runtime->dma_area = NULL; 348 } 349 mutex_unlock(&dev->lock); 350 kref_put(&dev->ref, em28xx_free_device); 351 352 return 0; 353 } 354 355 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, 356 struct snd_pcm_hw_params *hw_params) 357 { 358 int ret; 359 struct em28xx *dev = snd_pcm_substream_chip(substream); 360 361 if (dev->disconnected) 362 return -ENODEV; 363 364 dprintk("Setting capture parameters\n"); 365 366 ret = snd_pcm_alloc_vmalloc_buffer(substream, 367 params_buffer_bytes(hw_params)); 368 if (ret < 0) 369 return ret; 370 #if 0 371 /* 372 * TODO: set up em28xx audio chip to deliver the correct audio format, 373 * current default is 48000hz multiplexed => 96000hz mono 374 * which shouldn't matter since analogue TV only supports mono 375 */ 376 unsigned int channels, rate, format; 377 378 format = params_format(hw_params); 379 rate = params_rate(hw_params); 380 channels = params_channels(hw_params); 381 #endif 382 383 return 0; 384 } 385 386 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) 387 { 388 struct em28xx *dev = snd_pcm_substream_chip(substream); 389 struct em28xx_audio *adev = &dev->adev; 390 391 dprintk("Stop capture, if needed\n"); 392 393 if (atomic_read(&adev->stream_started) > 0) { 394 atomic_set(&adev->stream_started, 0); 395 schedule_work(&adev->wq_trigger); 396 } 397 398 return 0; 399 } 400 401 static int snd_em28xx_prepare(struct snd_pcm_substream *substream) 402 { 403 struct em28xx *dev = snd_pcm_substream_chip(substream); 404 405 if (dev->disconnected) 406 return -ENODEV; 407 408 dev->adev.hwptr_done_capture = 0; 409 dev->adev.capture_transfer_done = 0; 410 411 return 0; 412 } 413 414 static void audio_trigger(struct work_struct *work) 415 { 416 struct em28xx_audio *adev = 417 container_of(work, struct em28xx_audio, wq_trigger); 418 struct em28xx *dev = container_of(adev, struct em28xx, adev); 419 420 if (atomic_read(&adev->stream_started)) { 421 dprintk("starting capture"); 422 em28xx_init_audio_isoc(dev); 423 } else { 424 dprintk("stopping capture"); 425 em28xx_deinit_isoc_audio(dev); 426 } 427 } 428 429 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, 430 int cmd) 431 { 432 struct em28xx *dev = snd_pcm_substream_chip(substream); 433 int retval = 0; 434 435 if (dev->disconnected) 436 return -ENODEV; 437 438 switch (cmd) { 439 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 440 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 441 case SNDRV_PCM_TRIGGER_START: 442 atomic_set(&dev->adev.stream_started, 1); 443 break; 444 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 445 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 446 case SNDRV_PCM_TRIGGER_STOP: 447 atomic_set(&dev->adev.stream_started, 0); 448 break; 449 default: 450 retval = -EINVAL; 451 } 452 schedule_work(&dev->adev.wq_trigger); 453 return retval; 454 } 455 456 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream 457 *substream) 458 { 459 unsigned long flags; 460 struct em28xx *dev; 461 snd_pcm_uframes_t hwptr_done; 462 463 dev = snd_pcm_substream_chip(substream); 464 if (dev->disconnected) 465 return SNDRV_PCM_POS_XRUN; 466 467 spin_lock_irqsave(&dev->adev.slock, flags); 468 hwptr_done = dev->adev.hwptr_done_capture; 469 spin_unlock_irqrestore(&dev->adev.slock, flags); 470 471 return hwptr_done; 472 } 473 474 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, 475 unsigned long offset) 476 { 477 void *pageptr = subs->runtime->dma_area + offset; 478 479 return vmalloc_to_page(pageptr); 480 } 481 482 /* 483 * AC97 volume control support 484 */ 485 static int em28xx_vol_info(struct snd_kcontrol *kcontrol, 486 struct snd_ctl_elem_info *info) 487 { 488 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 489 490 if (dev->disconnected) 491 return -ENODEV; 492 493 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 494 info->count = 2; 495 info->value.integer.min = 0; 496 info->value.integer.max = 0x1f; 497 498 return 0; 499 } 500 501 static int em28xx_vol_put(struct snd_kcontrol *kcontrol, 502 struct snd_ctl_elem_value *value) 503 { 504 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 505 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 506 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | 507 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; 508 int nonblock = 0; 509 int rc; 510 511 if (dev->disconnected) 512 return -ENODEV; 513 514 if (substream) 515 nonblock = !!(substream->f_flags & O_NONBLOCK); 516 if (nonblock) { 517 if (!mutex_trylock(&dev->lock)) 518 return -EAGAIN; 519 } else { 520 mutex_lock(&dev->lock); 521 } 522 rc = em28xx_read_ac97(dev, kcontrol->private_value); 523 if (rc < 0) 524 goto err; 525 526 val |= rc & 0x8000; /* Preserve the mute flag */ 527 528 rc = em28xx_write_ac97(dev, kcontrol->private_value, val); 529 if (rc < 0) 530 goto err; 531 532 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 533 (val & 0x8000) ? "muted " : "", 534 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 535 val, (int)kcontrol->private_value); 536 537 err: 538 mutex_unlock(&dev->lock); 539 return rc; 540 } 541 542 static int em28xx_vol_get(struct snd_kcontrol *kcontrol, 543 struct snd_ctl_elem_value *value) 544 { 545 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 546 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 547 int nonblock = 0; 548 int val; 549 550 if (dev->disconnected) 551 return -ENODEV; 552 553 if (substream) 554 nonblock = !!(substream->f_flags & O_NONBLOCK); 555 if (nonblock) { 556 if (!mutex_trylock(&dev->lock)) 557 return -EAGAIN; 558 } else { 559 mutex_lock(&dev->lock); 560 } 561 val = em28xx_read_ac97(dev, kcontrol->private_value); 562 mutex_unlock(&dev->lock); 563 if (val < 0) 564 return val; 565 566 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 567 (val & 0x8000) ? "muted " : "", 568 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 569 val, (int)kcontrol->private_value); 570 571 value->value.integer.value[0] = 0x1f - (val & 0x1f); 572 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f); 573 574 return 0; 575 } 576 577 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, 578 struct snd_ctl_elem_value *value) 579 { 580 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 581 u16 val = value->value.integer.value[0]; 582 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 583 int nonblock = 0; 584 int rc; 585 586 if (dev->disconnected) 587 return -ENODEV; 588 589 if (substream) 590 nonblock = !!(substream->f_flags & O_NONBLOCK); 591 if (nonblock) { 592 if (!mutex_trylock(&dev->lock)) 593 return -EAGAIN; 594 } else { 595 mutex_lock(&dev->lock); 596 } 597 rc = em28xx_read_ac97(dev, kcontrol->private_value); 598 if (rc < 0) 599 goto err; 600 601 if (val) 602 rc &= 0x1f1f; 603 else 604 rc |= 0x8000; 605 606 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); 607 if (rc < 0) 608 goto err; 609 610 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", 611 (val & 0x8000) ? "muted " : "", 612 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 613 val, (int)kcontrol->private_value); 614 615 err: 616 mutex_unlock(&dev->lock); 617 return rc; 618 } 619 620 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, 621 struct snd_ctl_elem_value *value) 622 { 623 struct em28xx *dev = snd_kcontrol_chip(kcontrol); 624 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; 625 int nonblock = 0; 626 int val; 627 628 if (dev->disconnected) 629 return -ENODEV; 630 631 if (substream) 632 nonblock = !!(substream->f_flags & O_NONBLOCK); 633 if (nonblock) { 634 if (!mutex_trylock(&dev->lock)) 635 return -EAGAIN; 636 } else { 637 mutex_lock(&dev->lock); 638 } 639 val = em28xx_read_ac97(dev, kcontrol->private_value); 640 mutex_unlock(&dev->lock); 641 if (val < 0) 642 return val; 643 644 if (val & 0x8000) 645 value->value.integer.value[0] = 0; 646 else 647 value->value.integer.value[0] = 1; 648 649 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", 650 (val & 0x8000) ? "muted " : "", 651 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), 652 val, (int)kcontrol->private_value); 653 654 return 0; 655 } 656 657 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); 658 659 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, 660 char *name, int id) 661 { 662 int err; 663 char ctl_name[44]; 664 struct snd_kcontrol *kctl; 665 struct snd_kcontrol_new tmp; 666 667 memset(&tmp, 0, sizeof(tmp)); 668 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 669 tmp.private_value = id, 670 tmp.name = ctl_name, 671 672 /* Add Mute Control */ 673 sprintf(ctl_name, "%s Switch", name); 674 tmp.get = em28xx_vol_get_mute; 675 tmp.put = em28xx_vol_put_mute; 676 tmp.info = snd_ctl_boolean_mono_info; 677 kctl = snd_ctl_new1(&tmp, dev); 678 err = snd_ctl_add(card, kctl); 679 if (err < 0) 680 return err; 681 dprintk("Added control %s for ac97 volume control 0x%04x\n", 682 ctl_name, id); 683 684 memset(&tmp, 0, sizeof(tmp)); 685 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, 686 tmp.private_value = id, 687 tmp.name = ctl_name, 688 689 /* Add Volume Control */ 690 sprintf(ctl_name, "%s Volume", name); 691 tmp.get = em28xx_vol_get; 692 tmp.put = em28xx_vol_put; 693 tmp.info = em28xx_vol_info; 694 tmp.tlv.p = em28xx_db_scale, 695 kctl = snd_ctl_new1(&tmp, dev); 696 err = snd_ctl_add(card, kctl); 697 if (err < 0) 698 return err; 699 dprintk("Added control %s for ac97 volume control 0x%04x\n", 700 ctl_name, id); 701 702 return 0; 703 } 704 705 /* 706 * register/unregister code and data 707 */ 708 static const struct snd_pcm_ops snd_em28xx_pcm_capture = { 709 .open = snd_em28xx_capture_open, 710 .close = snd_em28xx_pcm_close, 711 .ioctl = snd_pcm_lib_ioctl, 712 .hw_params = snd_em28xx_hw_capture_params, 713 .hw_free = snd_em28xx_hw_capture_free, 714 .prepare = snd_em28xx_prepare, 715 .trigger = snd_em28xx_capture_trigger, 716 .pointer = snd_em28xx_capture_pointer, 717 .page = snd_pcm_get_vmalloc_page, 718 }; 719 720 static void em28xx_audio_free_urb(struct em28xx *dev) 721 { 722 struct usb_device *udev = interface_to_usbdev(dev->intf); 723 int i; 724 725 for (i = 0; i < dev->adev.num_urb; i++) { 726 struct urb *urb = dev->adev.urb[i]; 727 728 if (!urb) 729 continue; 730 731 usb_free_coherent(udev, urb->transfer_buffer_length, 732 dev->adev.transfer_buffer[i], 733 urb->transfer_dma); 734 735 usb_free_urb(urb); 736 } 737 kfree(dev->adev.urb); 738 kfree(dev->adev.transfer_buffer); 739 dev->adev.num_urb = 0; 740 } 741 742 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ 743 static int em28xx_audio_ep_packet_size(struct usb_device *udev, 744 struct usb_endpoint_descriptor *e) 745 { 746 int size = le16_to_cpu(e->wMaxPacketSize); 747 748 if (udev->speed == USB_SPEED_HIGH) 749 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); 750 751 return size & 0x7ff; 752 } 753 754 static int em28xx_audio_urb_init(struct em28xx *dev) 755 { 756 struct usb_interface *intf; 757 struct usb_endpoint_descriptor *e, *ep = NULL; 758 struct usb_device *udev = interface_to_usbdev(dev->intf); 759 int i, ep_size, interval, num_urb, npackets; 760 int urb_size, bytes_per_transfer; 761 u8 alt; 762 763 if (dev->ifnum) 764 alt = 1; 765 else 766 alt = 7; 767 768 intf = usb_ifnum_to_if(udev, dev->ifnum); 769 770 if (intf->num_altsetting <= alt) { 771 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n", 772 dev->ifnum, alt); 773 return -ENODEV; 774 } 775 776 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { 777 e = &intf->altsetting[alt].endpoint[i].desc; 778 if (!usb_endpoint_dir_in(e)) 779 continue; 780 if (e->bEndpointAddress == EM28XX_EP_AUDIO) { 781 ep = e; 782 break; 783 } 784 } 785 786 if (!ep) { 787 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint"); 788 return -ENODEV; 789 } 790 791 ep_size = em28xx_audio_ep_packet_size(udev, ep); 792 interval = 1 << (ep->bInterval - 1); 793 794 dev_info(&dev->intf->dev, 795 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", 796 EM28XX_EP_AUDIO, usb_speed_string(udev->speed), 797 dev->ifnum, alt, interval, ep_size); 798 799 /* Calculate the number and size of URBs to better fit the audio samples */ 800 801 /* 802 * Estimate the number of bytes per DMA transfer. 803 * 804 * This is given by the bit rate (for now, only 48000 Hz) multiplied 805 * by 2 channels and 2 bytes/sample divided by the number of microframe 806 * intervals and by the microframe rate (125 us) 807 */ 808 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); 809 810 /* 811 * Estimate the number of transfer URBs. Don't let it go past the 812 * maximum number of URBs that is known to be supported by the device. 813 */ 814 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); 815 if (num_urb > EM28XX_MAX_AUDIO_BUFS) 816 num_urb = EM28XX_MAX_AUDIO_BUFS; 817 818 /* 819 * Now that we know the number of bytes per transfer and the number of 820 * URBs, estimate the typical size of an URB, in order to adjust the 821 * minimal number of packets. 822 */ 823 urb_size = bytes_per_transfer / num_urb; 824 825 /* 826 * Now, calculate the amount of audio packets to be filled on each 827 * URB. In order to preserve the old behaviour, use a minimal 828 * threshold for this value. 829 */ 830 npackets = EM28XX_MIN_AUDIO_PACKETS; 831 if (urb_size > ep_size * npackets) 832 npackets = DIV_ROUND_UP(urb_size, ep_size); 833 834 dev_info(&dev->intf->dev, 835 "Number of URBs: %d, with %d packets and %d size\n", 836 num_urb, npackets, urb_size); 837 838 /* Estimate the bytes per period */ 839 dev->adev.period = urb_size * npackets; 840 841 /* Allocate space to store the number of URBs to be used */ 842 843 dev->adev.transfer_buffer = kcalloc(num_urb, 844 sizeof(*dev->adev.transfer_buffer), 845 GFP_KERNEL); 846 if (!dev->adev.transfer_buffer) 847 return -ENOMEM; 848 849 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL); 850 if (!dev->adev.urb) { 851 kfree(dev->adev.transfer_buffer); 852 return -ENOMEM; 853 } 854 855 /* Alloc memory for each URB and for each transfer buffer */ 856 dev->adev.num_urb = num_urb; 857 for (i = 0; i < num_urb; i++) { 858 struct urb *urb; 859 int j, k; 860 void *buf; 861 862 urb = usb_alloc_urb(npackets, GFP_KERNEL); 863 if (!urb) { 864 em28xx_audio_free_urb(dev); 865 return -ENOMEM; 866 } 867 dev->adev.urb[i] = urb; 868 869 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL, 870 &urb->transfer_dma); 871 if (!buf) { 872 dev_err(&dev->intf->dev, 873 "usb_alloc_coherent failed!\n"); 874 em28xx_audio_free_urb(dev); 875 return -ENOMEM; 876 } 877 dev->adev.transfer_buffer[i] = buf; 878 879 urb->dev = udev; 880 urb->context = dev; 881 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO); 882 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 883 urb->transfer_buffer = buf; 884 urb->interval = interval; 885 urb->complete = em28xx_audio_isocirq; 886 urb->number_of_packets = npackets; 887 urb->transfer_buffer_length = ep_size * npackets; 888 889 for (j = k = 0; j < npackets; j++, k += ep_size) { 890 urb->iso_frame_desc[j].offset = k; 891 urb->iso_frame_desc[j].length = ep_size; 892 } 893 } 894 895 return 0; 896 } 897 898 static int em28xx_audio_init(struct em28xx *dev) 899 { 900 struct em28xx_audio *adev = &dev->adev; 901 struct usb_device *udev = interface_to_usbdev(dev->intf); 902 struct snd_pcm *pcm; 903 struct snd_card *card; 904 static int devnr; 905 int err; 906 907 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 908 /* 909 * This device does not support the extension (in this case 910 * the device is expecting the snd-usb-audio module or 911 * doesn't have analog audio support at all) 912 */ 913 return 0; 914 } 915 916 dev_info(&dev->intf->dev, "Binding audio extension\n"); 917 918 kref_get(&dev->ref); 919 920 dev_info(&dev->intf->dev, 921 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n"); 922 dev_info(&dev->intf->dev, 923 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n"); 924 925 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio", 926 THIS_MODULE, 0, &card); 927 if (err < 0) 928 return err; 929 930 spin_lock_init(&adev->slock); 931 adev->sndcard = card; 932 adev->udev = udev; 933 934 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 935 if (err < 0) 936 goto card_free; 937 938 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); 939 pcm->info_flags = 0; 940 pcm->private_data = dev; 941 strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name)); 942 943 strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver)); 944 strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname)); 945 strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname)); 946 947 INIT_WORK(&adev->wq_trigger, audio_trigger); 948 949 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { 950 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); 951 em28xx_cvol_new(card, dev, "Line In", AC97_LINE); 952 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); 953 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); 954 em28xx_cvol_new(card, dev, "CD", AC97_CD); 955 em28xx_cvol_new(card, dev, "AUX", AC97_AUX); 956 em28xx_cvol_new(card, dev, "PCM", AC97_PCM); 957 958 em28xx_cvol_new(card, dev, "Master", AC97_MASTER); 959 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); 960 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); 961 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); 962 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); 963 } 964 965 err = em28xx_audio_urb_init(dev); 966 if (err) 967 goto card_free; 968 969 err = snd_card_register(card); 970 if (err < 0) 971 goto urb_free; 972 973 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n"); 974 return 0; 975 976 urb_free: 977 em28xx_audio_free_urb(dev); 978 979 card_free: 980 snd_card_free(card); 981 adev->sndcard = NULL; 982 983 return err; 984 } 985 986 static int em28xx_audio_fini(struct em28xx *dev) 987 { 988 if (!dev) 989 return 0; 990 991 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { 992 /* 993 * This device does not support the extension (in this case 994 * the device is expecting the snd-usb-audio module or 995 * doesn't have analog audio support at all) 996 */ 997 return 0; 998 } 999 1000 dev_info(&dev->intf->dev, "Closing audio extension\n"); 1001 1002 if (dev->adev.sndcard) { 1003 snd_card_disconnect(dev->adev.sndcard); 1004 flush_work(&dev->adev.wq_trigger); 1005 1006 em28xx_audio_free_urb(dev); 1007 1008 snd_card_free(dev->adev.sndcard); 1009 dev->adev.sndcard = NULL; 1010 } 1011 1012 kref_put(&dev->ref, em28xx_free_device); 1013 return 0; 1014 } 1015 1016 static int em28xx_audio_suspend(struct em28xx *dev) 1017 { 1018 if (!dev) 1019 return 0; 1020 1021 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1022 return 0; 1023 1024 dev_info(&dev->intf->dev, "Suspending audio extension\n"); 1025 em28xx_deinit_isoc_audio(dev); 1026 atomic_set(&dev->adev.stream_started, 0); 1027 return 0; 1028 } 1029 1030 static int em28xx_audio_resume(struct em28xx *dev) 1031 { 1032 if (!dev) 1033 return 0; 1034 1035 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) 1036 return 0; 1037 1038 dev_info(&dev->intf->dev, "Resuming audio extension\n"); 1039 /* Nothing to do other than schedule_work() ?? */ 1040 schedule_work(&dev->adev.wq_trigger); 1041 return 0; 1042 } 1043 1044 static struct em28xx_ops audio_ops = { 1045 .id = EM28XX_AUDIO, 1046 .name = "Em28xx Audio Extension", 1047 .init = em28xx_audio_init, 1048 .fini = em28xx_audio_fini, 1049 .suspend = em28xx_audio_suspend, 1050 .resume = em28xx_audio_resume, 1051 }; 1052 1053 static int __init em28xx_alsa_register(void) 1054 { 1055 return em28xx_register_extension(&audio_ops); 1056 } 1057 1058 static void __exit em28xx_alsa_unregister(void) 1059 { 1060 em28xx_unregister_extension(&audio_ops); 1061 } 1062 1063 MODULE_LICENSE("GPL v2"); 1064 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); 1065 MODULE_AUTHOR("Mauro Carvalho Chehab"); 1066 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); 1067 MODULE_VERSION(EM28XX_VERSION); 1068 1069 module_init(em28xx_alsa_register); 1070 module_exit(em28xx_alsa_unregister); 1071