1 /* 2 * Apple iSight audio driver 3 * 4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de> 5 * Licensed under the terms of the GNU General Public License, version 2. 6 */ 7 8 #include <asm/byteorder.h> 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/firewire.h> 12 #include <linux/firewire-constants.h> 13 #include <linux/module.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/mutex.h> 16 #include <linux/string.h> 17 #include <sound/control.h> 18 #include <sound/core.h> 19 #include <sound/initval.h> 20 #include <sound/pcm.h> 21 #include <sound/tlv.h> 22 #include "lib.h" 23 #include "iso-resources.h" 24 #include "packets-buffer.h" 25 26 #define OUI_APPLE 0x000a27 27 #define MODEL_APPLE_ISIGHT 0x000008 28 #define SW_ISIGHT_AUDIO 0x000010 29 30 #define REG_AUDIO_ENABLE 0x000 31 #define AUDIO_ENABLE 0x80000000 32 #define REG_DEF_AUDIO_GAIN 0x204 33 #define REG_GAIN_RAW_START 0x210 34 #define REG_GAIN_RAW_END 0x214 35 #define REG_GAIN_DB_START 0x218 36 #define REG_GAIN_DB_END 0x21c 37 #define REG_SAMPLE_RATE_INQUIRY 0x280 38 #define REG_ISO_TX_CONFIG 0x300 39 #define SPEED_SHIFT 16 40 #define REG_SAMPLE_RATE 0x400 41 #define RATE_48000 0x80000000 42 #define REG_GAIN 0x500 43 #define REG_MUTE 0x504 44 45 #define MAX_FRAMES_PER_PACKET 475 46 47 #define QUEUE_LENGTH 20 48 49 struct isight { 50 struct snd_card *card; 51 struct fw_unit *unit; 52 struct fw_device *device; 53 u64 audio_base; 54 struct snd_pcm_substream *pcm; 55 struct mutex mutex; 56 struct iso_packets_buffer buffer; 57 struct fw_iso_resources resources; 58 struct fw_iso_context *context; 59 bool pcm_active; 60 bool pcm_running; 61 bool first_packet; 62 int packet_index; 63 u32 total_samples; 64 unsigned int buffer_pointer; 65 unsigned int period_counter; 66 s32 gain_min, gain_max; 67 unsigned int gain_tlv[4]; 68 }; 69 70 struct audio_payload { 71 __be32 sample_count; 72 __be32 signature; 73 __be32 sample_total; 74 __be32 reserved; 75 __be16 samples[2 * MAX_FRAMES_PER_PACKET]; 76 }; 77 78 MODULE_DESCRIPTION("iSight audio driver"); 79 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); 80 MODULE_LICENSE("GPL v2"); 81 82 static struct fw_iso_packet audio_packet = { 83 .payload_length = sizeof(struct audio_payload), 84 .interrupt = 1, 85 .header_length = 4, 86 }; 87 88 static void isight_update_pointers(struct isight *isight, unsigned int count) 89 { 90 struct snd_pcm_runtime *runtime = isight->pcm->runtime; 91 unsigned int ptr; 92 93 smp_wmb(); /* update buffer data before buffer pointer */ 94 95 ptr = isight->buffer_pointer; 96 ptr += count; 97 if (ptr >= runtime->buffer_size) 98 ptr -= runtime->buffer_size; 99 ACCESS_ONCE(isight->buffer_pointer) = ptr; 100 101 isight->period_counter += count; 102 if (isight->period_counter >= runtime->period_size) { 103 isight->period_counter -= runtime->period_size; 104 snd_pcm_period_elapsed(isight->pcm); 105 } 106 } 107 108 static void isight_samples(struct isight *isight, 109 const __be16 *samples, unsigned int count) 110 { 111 struct snd_pcm_runtime *runtime; 112 unsigned int count1; 113 114 if (!ACCESS_ONCE(isight->pcm_running)) 115 return; 116 117 runtime = isight->pcm->runtime; 118 if (isight->buffer_pointer + count <= runtime->buffer_size) { 119 memcpy(runtime->dma_area + isight->buffer_pointer * 4, 120 samples, count * 4); 121 } else { 122 count1 = runtime->buffer_size - isight->buffer_pointer; 123 memcpy(runtime->dma_area + isight->buffer_pointer * 4, 124 samples, count1 * 4); 125 samples += count1 * 2; 126 memcpy(runtime->dma_area, samples, (count - count1) * 4); 127 } 128 129 isight_update_pointers(isight, count); 130 } 131 132 static void isight_pcm_abort(struct isight *isight) 133 { 134 if (ACCESS_ONCE(isight->pcm_active)) 135 snd_pcm_stop_xrun(isight->pcm); 136 } 137 138 static void isight_dropped_samples(struct isight *isight, unsigned int total) 139 { 140 struct snd_pcm_runtime *runtime; 141 u32 dropped; 142 unsigned int count1; 143 144 if (!ACCESS_ONCE(isight->pcm_running)) 145 return; 146 147 runtime = isight->pcm->runtime; 148 dropped = total - isight->total_samples; 149 if (dropped < runtime->buffer_size) { 150 if (isight->buffer_pointer + dropped <= runtime->buffer_size) { 151 memset(runtime->dma_area + isight->buffer_pointer * 4, 152 0, dropped * 4); 153 } else { 154 count1 = runtime->buffer_size - isight->buffer_pointer; 155 memset(runtime->dma_area + isight->buffer_pointer * 4, 156 0, count1 * 4); 157 memset(runtime->dma_area, 0, (dropped - count1) * 4); 158 } 159 isight_update_pointers(isight, dropped); 160 } else { 161 isight_pcm_abort(isight); 162 } 163 } 164 165 static void isight_packet(struct fw_iso_context *context, u32 cycle, 166 size_t header_length, void *header, void *data) 167 { 168 struct isight *isight = data; 169 const struct audio_payload *payload; 170 unsigned int index, length, count, total; 171 int err; 172 173 if (isight->packet_index < 0) 174 return; 175 index = isight->packet_index; 176 payload = isight->buffer.packets[index].buffer; 177 length = be32_to_cpup(header) >> 16; 178 179 if (likely(length >= 16 && 180 payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) { 181 count = be32_to_cpu(payload->sample_count); 182 if (likely(count <= (length - 16) / 4)) { 183 total = be32_to_cpu(payload->sample_total); 184 if (unlikely(total != isight->total_samples)) { 185 if (!isight->first_packet) 186 isight_dropped_samples(isight, total); 187 isight->first_packet = false; 188 isight->total_samples = total; 189 } 190 191 isight_samples(isight, payload->samples, count); 192 isight->total_samples += count; 193 } 194 } 195 196 err = fw_iso_context_queue(isight->context, &audio_packet, 197 &isight->buffer.iso_buffer, 198 isight->buffer.packets[index].offset); 199 if (err < 0) { 200 dev_err(&isight->unit->device, "queueing error: %d\n", err); 201 isight_pcm_abort(isight); 202 isight->packet_index = -1; 203 return; 204 } 205 fw_iso_context_queue_flush(isight->context); 206 207 if (++index >= QUEUE_LENGTH) 208 index = 0; 209 isight->packet_index = index; 210 } 211 212 static int isight_connect(struct isight *isight) 213 { 214 int ch, err; 215 __be32 value; 216 217 retry_after_bus_reset: 218 ch = fw_iso_resources_allocate(&isight->resources, 219 sizeof(struct audio_payload), 220 isight->device->max_speed); 221 if (ch < 0) { 222 err = ch; 223 goto error; 224 } 225 226 value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT)); 227 err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST, 228 isight->audio_base + REG_ISO_TX_CONFIG, 229 &value, 4, FW_FIXED_GENERATION | 230 isight->resources.generation); 231 if (err == -EAGAIN) { 232 fw_iso_resources_free(&isight->resources); 233 goto retry_after_bus_reset; 234 } else if (err < 0) { 235 goto err_resources; 236 } 237 238 return 0; 239 240 err_resources: 241 fw_iso_resources_free(&isight->resources); 242 error: 243 return err; 244 } 245 246 static int isight_open(struct snd_pcm_substream *substream) 247 { 248 static const struct snd_pcm_hardware hardware = { 249 .info = SNDRV_PCM_INFO_MMAP | 250 SNDRV_PCM_INFO_MMAP_VALID | 251 SNDRV_PCM_INFO_BATCH | 252 SNDRV_PCM_INFO_INTERLEAVED | 253 SNDRV_PCM_INFO_BLOCK_TRANSFER, 254 .formats = SNDRV_PCM_FMTBIT_S16_BE, 255 .rates = SNDRV_PCM_RATE_48000, 256 .rate_min = 48000, 257 .rate_max = 48000, 258 .channels_min = 2, 259 .channels_max = 2, 260 .buffer_bytes_max = 4 * 1024 * 1024, 261 .period_bytes_min = MAX_FRAMES_PER_PACKET * 4, 262 .period_bytes_max = 1024 * 1024, 263 .periods_min = 2, 264 .periods_max = UINT_MAX, 265 }; 266 struct isight *isight = substream->private_data; 267 268 substream->runtime->hw = hardware; 269 270 return iso_packets_buffer_init(&isight->buffer, isight->unit, 271 QUEUE_LENGTH, 272 sizeof(struct audio_payload), 273 DMA_FROM_DEVICE); 274 } 275 276 static int isight_close(struct snd_pcm_substream *substream) 277 { 278 struct isight *isight = substream->private_data; 279 280 iso_packets_buffer_destroy(&isight->buffer, isight->unit); 281 282 return 0; 283 } 284 285 static int isight_hw_params(struct snd_pcm_substream *substream, 286 struct snd_pcm_hw_params *hw_params) 287 { 288 struct isight *isight = substream->private_data; 289 int err; 290 291 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 292 params_buffer_bytes(hw_params)); 293 if (err < 0) 294 return err; 295 296 ACCESS_ONCE(isight->pcm_active) = true; 297 298 return 0; 299 } 300 301 static int reg_read(struct isight *isight, int offset, __be32 *value) 302 { 303 return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST, 304 isight->audio_base + offset, value, 4, 0); 305 } 306 307 static int reg_write(struct isight *isight, int offset, __be32 value) 308 { 309 return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST, 310 isight->audio_base + offset, &value, 4, 0); 311 } 312 313 static void isight_stop_streaming(struct isight *isight) 314 { 315 __be32 value; 316 317 if (!isight->context) 318 return; 319 320 fw_iso_context_stop(isight->context); 321 fw_iso_context_destroy(isight->context); 322 isight->context = NULL; 323 fw_iso_resources_free(&isight->resources); 324 value = 0; 325 snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST, 326 isight->audio_base + REG_AUDIO_ENABLE, 327 &value, 4, FW_QUIET); 328 } 329 330 static int isight_hw_free(struct snd_pcm_substream *substream) 331 { 332 struct isight *isight = substream->private_data; 333 334 ACCESS_ONCE(isight->pcm_active) = false; 335 336 mutex_lock(&isight->mutex); 337 isight_stop_streaming(isight); 338 mutex_unlock(&isight->mutex); 339 340 return snd_pcm_lib_free_vmalloc_buffer(substream); 341 } 342 343 static int isight_start_streaming(struct isight *isight) 344 { 345 unsigned int i; 346 int err; 347 348 if (isight->context) { 349 if (isight->packet_index < 0) 350 isight_stop_streaming(isight); 351 else 352 return 0; 353 } 354 355 err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000)); 356 if (err < 0) 357 goto error; 358 359 err = isight_connect(isight); 360 if (err < 0) 361 goto error; 362 363 err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE)); 364 if (err < 0) 365 goto err_resources; 366 367 isight->context = fw_iso_context_create(isight->device->card, 368 FW_ISO_CONTEXT_RECEIVE, 369 isight->resources.channel, 370 isight->device->max_speed, 371 4, isight_packet, isight); 372 if (IS_ERR(isight->context)) { 373 err = PTR_ERR(isight->context); 374 isight->context = NULL; 375 goto err_resources; 376 } 377 378 for (i = 0; i < QUEUE_LENGTH; ++i) { 379 err = fw_iso_context_queue(isight->context, &audio_packet, 380 &isight->buffer.iso_buffer, 381 isight->buffer.packets[i].offset); 382 if (err < 0) 383 goto err_context; 384 } 385 386 isight->first_packet = true; 387 isight->packet_index = 0; 388 389 err = fw_iso_context_start(isight->context, -1, 0, 390 FW_ISO_CONTEXT_MATCH_ALL_TAGS/*?*/); 391 if (err < 0) 392 goto err_context; 393 394 return 0; 395 396 err_context: 397 fw_iso_context_destroy(isight->context); 398 isight->context = NULL; 399 err_resources: 400 fw_iso_resources_free(&isight->resources); 401 reg_write(isight, REG_AUDIO_ENABLE, 0); 402 error: 403 return err; 404 } 405 406 static int isight_prepare(struct snd_pcm_substream *substream) 407 { 408 struct isight *isight = substream->private_data; 409 int err; 410 411 isight->buffer_pointer = 0; 412 isight->period_counter = 0; 413 414 mutex_lock(&isight->mutex); 415 err = isight_start_streaming(isight); 416 mutex_unlock(&isight->mutex); 417 418 return err; 419 } 420 421 static int isight_trigger(struct snd_pcm_substream *substream, int cmd) 422 { 423 struct isight *isight = substream->private_data; 424 425 switch (cmd) { 426 case SNDRV_PCM_TRIGGER_START: 427 ACCESS_ONCE(isight->pcm_running) = true; 428 break; 429 case SNDRV_PCM_TRIGGER_STOP: 430 ACCESS_ONCE(isight->pcm_running) = false; 431 break; 432 default: 433 return -EINVAL; 434 } 435 return 0; 436 } 437 438 static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream) 439 { 440 struct isight *isight = substream->private_data; 441 442 return ACCESS_ONCE(isight->buffer_pointer); 443 } 444 445 static int isight_create_pcm(struct isight *isight) 446 { 447 static const struct snd_pcm_ops ops = { 448 .open = isight_open, 449 .close = isight_close, 450 .ioctl = snd_pcm_lib_ioctl, 451 .hw_params = isight_hw_params, 452 .hw_free = isight_hw_free, 453 .prepare = isight_prepare, 454 .trigger = isight_trigger, 455 .pointer = isight_pointer, 456 .page = snd_pcm_lib_get_vmalloc_page, 457 .mmap = snd_pcm_lib_mmap_vmalloc, 458 }; 459 struct snd_pcm *pcm; 460 int err; 461 462 err = snd_pcm_new(isight->card, "iSight", 0, 0, 1, &pcm); 463 if (err < 0) 464 return err; 465 pcm->private_data = isight; 466 strcpy(pcm->name, "iSight"); 467 isight->pcm = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 468 isight->pcm->ops = &ops; 469 470 return 0; 471 } 472 473 static int isight_gain_info(struct snd_kcontrol *ctl, 474 struct snd_ctl_elem_info *info) 475 { 476 struct isight *isight = ctl->private_data; 477 478 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 479 info->count = 1; 480 info->value.integer.min = isight->gain_min; 481 info->value.integer.max = isight->gain_max; 482 483 return 0; 484 } 485 486 static int isight_gain_get(struct snd_kcontrol *ctl, 487 struct snd_ctl_elem_value *value) 488 { 489 struct isight *isight = ctl->private_data; 490 __be32 gain; 491 int err; 492 493 err = reg_read(isight, REG_GAIN, &gain); 494 if (err < 0) 495 return err; 496 497 value->value.integer.value[0] = (s32)be32_to_cpu(gain); 498 499 return 0; 500 } 501 502 static int isight_gain_put(struct snd_kcontrol *ctl, 503 struct snd_ctl_elem_value *value) 504 { 505 struct isight *isight = ctl->private_data; 506 507 if (value->value.integer.value[0] < isight->gain_min || 508 value->value.integer.value[0] > isight->gain_max) 509 return -EINVAL; 510 511 return reg_write(isight, REG_GAIN, 512 cpu_to_be32(value->value.integer.value[0])); 513 } 514 515 static int isight_mute_get(struct snd_kcontrol *ctl, 516 struct snd_ctl_elem_value *value) 517 { 518 struct isight *isight = ctl->private_data; 519 __be32 mute; 520 int err; 521 522 err = reg_read(isight, REG_MUTE, &mute); 523 if (err < 0) 524 return err; 525 526 value->value.integer.value[0] = !mute; 527 528 return 0; 529 } 530 531 static int isight_mute_put(struct snd_kcontrol *ctl, 532 struct snd_ctl_elem_value *value) 533 { 534 struct isight *isight = ctl->private_data; 535 536 return reg_write(isight, REG_MUTE, 537 (__force __be32)!value->value.integer.value[0]); 538 } 539 540 static int isight_create_mixer(struct isight *isight) 541 { 542 static const struct snd_kcontrol_new gain_control = { 543 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 544 .name = "Mic Capture Volume", 545 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | 546 SNDRV_CTL_ELEM_ACCESS_TLV_READ, 547 .info = isight_gain_info, 548 .get = isight_gain_get, 549 .put = isight_gain_put, 550 }; 551 static const struct snd_kcontrol_new mute_control = { 552 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 553 .name = "Mic Capture Switch", 554 .info = snd_ctl_boolean_mono_info, 555 .get = isight_mute_get, 556 .put = isight_mute_put, 557 }; 558 __be32 value; 559 struct snd_kcontrol *ctl; 560 int err; 561 562 err = reg_read(isight, REG_GAIN_RAW_START, &value); 563 if (err < 0) 564 return err; 565 isight->gain_min = be32_to_cpu(value); 566 567 err = reg_read(isight, REG_GAIN_RAW_END, &value); 568 if (err < 0) 569 return err; 570 isight->gain_max = be32_to_cpu(value); 571 572 isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX; 573 isight->gain_tlv[1] = 2 * sizeof(unsigned int); 574 575 err = reg_read(isight, REG_GAIN_DB_START, &value); 576 if (err < 0) 577 return err; 578 isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100; 579 580 err = reg_read(isight, REG_GAIN_DB_END, &value); 581 if (err < 0) 582 return err; 583 isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100; 584 585 ctl = snd_ctl_new1(&gain_control, isight); 586 if (ctl) 587 ctl->tlv.p = isight->gain_tlv; 588 err = snd_ctl_add(isight->card, ctl); 589 if (err < 0) 590 return err; 591 592 err = snd_ctl_add(isight->card, snd_ctl_new1(&mute_control, isight)); 593 if (err < 0) 594 return err; 595 596 return 0; 597 } 598 599 static void isight_card_free(struct snd_card *card) 600 { 601 struct isight *isight = card->private_data; 602 603 fw_iso_resources_destroy(&isight->resources); 604 fw_unit_put(isight->unit); 605 mutex_destroy(&isight->mutex); 606 } 607 608 static u64 get_unit_base(struct fw_unit *unit) 609 { 610 struct fw_csr_iterator i; 611 int key, value; 612 613 fw_csr_iterator_init(&i, unit->directory); 614 while (fw_csr_iterator_next(&i, &key, &value)) 615 if (key == CSR_OFFSET) 616 return CSR_REGISTER_BASE + value * 4; 617 return 0; 618 } 619 620 static int isight_probe(struct fw_unit *unit, 621 const struct ieee1394_device_id *id) 622 { 623 struct fw_device *fw_dev = fw_parent_device(unit); 624 struct snd_card *card; 625 struct isight *isight; 626 int err; 627 628 err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE, 629 sizeof(*isight), &card); 630 if (err < 0) 631 return err; 632 633 isight = card->private_data; 634 isight->card = card; 635 mutex_init(&isight->mutex); 636 isight->unit = fw_unit_get(unit); 637 isight->device = fw_dev; 638 isight->audio_base = get_unit_base(unit); 639 if (!isight->audio_base) { 640 dev_err(&unit->device, "audio unit base not found\n"); 641 err = -ENXIO; 642 goto err_unit; 643 } 644 fw_iso_resources_init(&isight->resources, unit); 645 646 card->private_free = isight_card_free; 647 648 strcpy(card->driver, "iSight"); 649 strcpy(card->shortname, "Apple iSight"); 650 snprintf(card->longname, sizeof(card->longname), 651 "Apple iSight (GUID %08x%08x) at %s, S%d", 652 fw_dev->config_rom[3], fw_dev->config_rom[4], 653 dev_name(&unit->device), 100 << fw_dev->max_speed); 654 strcpy(card->mixername, "iSight"); 655 656 err = isight_create_pcm(isight); 657 if (err < 0) 658 goto error; 659 660 err = isight_create_mixer(isight); 661 if (err < 0) 662 goto error; 663 664 err = snd_card_register(card); 665 if (err < 0) 666 goto error; 667 668 dev_set_drvdata(&unit->device, isight); 669 670 return 0; 671 672 err_unit: 673 fw_unit_put(isight->unit); 674 mutex_destroy(&isight->mutex); 675 error: 676 snd_card_free(card); 677 return err; 678 } 679 680 static void isight_bus_reset(struct fw_unit *unit) 681 { 682 struct isight *isight = dev_get_drvdata(&unit->device); 683 684 if (fw_iso_resources_update(&isight->resources) < 0) { 685 isight_pcm_abort(isight); 686 687 mutex_lock(&isight->mutex); 688 isight_stop_streaming(isight); 689 mutex_unlock(&isight->mutex); 690 } 691 } 692 693 static void isight_remove(struct fw_unit *unit) 694 { 695 struct isight *isight = dev_get_drvdata(&unit->device); 696 697 isight_pcm_abort(isight); 698 699 snd_card_disconnect(isight->card); 700 701 mutex_lock(&isight->mutex); 702 isight_stop_streaming(isight); 703 mutex_unlock(&isight->mutex); 704 705 snd_card_free_when_closed(isight->card); 706 } 707 708 static const struct ieee1394_device_id isight_id_table[] = { 709 { 710 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | 711 IEEE1394_MATCH_VERSION, 712 .specifier_id = OUI_APPLE, 713 .version = SW_ISIGHT_AUDIO, 714 }, 715 { } 716 }; 717 MODULE_DEVICE_TABLE(ieee1394, isight_id_table); 718 719 static struct fw_driver isight_driver = { 720 .driver = { 721 .owner = THIS_MODULE, 722 .name = KBUILD_MODNAME, 723 .bus = &fw_bus_type, 724 }, 725 .probe = isight_probe, 726 .update = isight_bus_reset, 727 .remove = isight_remove, 728 .id_table = isight_id_table, 729 }; 730 731 static int __init alsa_isight_init(void) 732 { 733 return driver_register(&isight_driver.driver); 734 } 735 736 static void __exit alsa_isight_exit(void) 737 { 738 driver_unregister(&isight_driver.driver); 739 } 740 741 module_init(alsa_isight_init); 742 module_exit(alsa_isight_exit); 743