1 /* 2 * Line6 Linux USB driver - 0.9.1beta 3 * 4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2. 9 * 10 */ 11 12 #include <linux/slab.h> 13 #include <sound/core.h> 14 #include <sound/pcm.h> 15 #include <sound/pcm_params.h> 16 17 #include "audio.h" 18 #include "capture.h" 19 #include "driver.h" 20 #include "pcm.h" 21 #include "pod.h" 22 #include "playback.h" 23 24 /* 25 Software stereo volume control. 26 */ 27 static void change_volume(struct urb *urb_out, int volume[], 28 int bytes_per_frame) 29 { 30 int chn = 0; 31 32 if (volume[0] == 256 && volume[1] == 256) 33 return; /* maximum volume - no change */ 34 35 if (bytes_per_frame == 4) { 36 short *p, *buf_end; 37 38 p = (short *)urb_out->transfer_buffer; 39 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p); 40 41 for (; p < buf_end; ++p) { 42 *p = (*p * volume[chn & 1]) >> 8; 43 ++chn; 44 } 45 } else if (bytes_per_frame == 6) { 46 unsigned char *p, *buf_end; 47 48 p = (unsigned char *)urb_out->transfer_buffer; 49 buf_end = p + urb_out->transfer_buffer_length; 50 51 for (; p < buf_end; p += 3) { 52 int val; 53 54 val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16); 55 val = (val * volume[chn & 1]) >> 8; 56 p[0] = val; 57 p[1] = val >> 8; 58 p[2] = val >> 16; 59 ++chn; 60 } 61 } 62 } 63 64 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 65 66 /* 67 Create signal for impulse response test. 68 */ 69 static void create_impulse_test_signal(struct snd_line6_pcm *line6pcm, 70 struct urb *urb_out, int bytes_per_frame) 71 { 72 int frames = urb_out->transfer_buffer_length / bytes_per_frame; 73 74 if (bytes_per_frame == 4) { 75 int i; 76 short *pi = (short *)line6pcm->prev_fbuf; 77 short *po = (short *)urb_out->transfer_buffer; 78 79 for (i = 0; i < frames; ++i) { 80 po[0] = pi[0]; 81 po[1] = 0; 82 pi += 2; 83 po += 2; 84 } 85 } else if (bytes_per_frame == 6) { 86 int i, j; 87 unsigned char *pi = line6pcm->prev_fbuf; 88 unsigned char *po = urb_out->transfer_buffer; 89 90 for (i = 0; i < frames; ++i) { 91 for (j = 0; j < bytes_per_frame / 2; ++j) 92 po[j] = pi[j]; 93 94 for (; j < bytes_per_frame; ++j) 95 po[j] = 0; 96 97 pi += bytes_per_frame; 98 po += bytes_per_frame; 99 } 100 } 101 if (--line6pcm->impulse_count <= 0) { 102 ((unsigned char *)(urb_out->transfer_buffer))[bytes_per_frame - 103 1] = 104 line6pcm->impulse_volume; 105 line6pcm->impulse_count = line6pcm->impulse_period; 106 } 107 } 108 109 #endif 110 111 /* 112 Add signal to buffer for software monitoring. 113 */ 114 static void add_monitor_signal(struct urb *urb_out, unsigned char *signal, 115 int volume, int bytes_per_frame) 116 { 117 if (volume == 0) 118 return; /* zero volume - no change */ 119 120 if (bytes_per_frame == 4) { 121 short *pi, *po, *buf_end; 122 123 pi = (short *)signal; 124 po = (short *)urb_out->transfer_buffer; 125 buf_end = po + urb_out->transfer_buffer_length / sizeof(*po); 126 127 for (; po < buf_end; ++pi, ++po) 128 *po += (*pi * volume) >> 8; 129 } 130 131 /* 132 We don't need to handle devices with 6 bytes per frame here 133 since they all support hardware monitoring. 134 */ 135 } 136 137 /* 138 Find a free URB, prepare audio data, and submit URB. 139 */ 140 static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm) 141 { 142 int index; 143 unsigned long flags; 144 int i, urb_size, urb_frames; 145 int ret; 146 const int bytes_per_frame = line6pcm->properties->bytes_per_frame; 147 const int frame_increment = 148 line6pcm->properties->snd_line6_rates.rats[0].num_min; 149 const int frame_factor = 150 line6pcm->properties->snd_line6_rates.rats[0].den * 151 (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL); 152 struct urb *urb_out; 153 154 spin_lock_irqsave(&line6pcm->lock_audio_out, flags); 155 index = 156 find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS); 157 158 if (index < 0 || index >= LINE6_ISO_BUFFERS) { 159 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags); 160 dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); 161 return -EINVAL; 162 } 163 164 urb_out = line6pcm->urb_audio_out[index]; 165 urb_size = 0; 166 167 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 168 /* compute frame size for given sampling rate */ 169 int fsize = 0; 170 struct usb_iso_packet_descriptor *fout = 171 &urb_out->iso_frame_desc[i]; 172 173 if (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM) 174 fsize = line6pcm->prev_fsize; 175 176 if (fsize == 0) { 177 int n; 178 179 line6pcm->count_out += frame_increment; 180 n = line6pcm->count_out / frame_factor; 181 line6pcm->count_out -= n * frame_factor; 182 fsize = n * bytes_per_frame; 183 } 184 185 fout->offset = urb_size; 186 fout->length = fsize; 187 urb_size += fsize; 188 } 189 190 if (urb_size == 0) { 191 /* can't determine URB size */ 192 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags); 193 dev_err(line6pcm->line6->ifcdev, "driver bug: urb_size = 0\n"); 194 return -EINVAL; 195 } 196 197 urb_frames = urb_size / bytes_per_frame; 198 urb_out->transfer_buffer = 199 line6pcm->buffer_out + 200 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size; 201 urb_out->transfer_buffer_length = urb_size; 202 urb_out->context = line6pcm; 203 204 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags) && 205 !test_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags)) { 206 struct snd_pcm_runtime *runtime = 207 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK)->runtime; 208 209 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) { 210 /* 211 The transferred area goes over buffer boundary, 212 copy the data to the temp buffer. 213 */ 214 int len; 215 216 len = runtime->buffer_size - line6pcm->pos_out; 217 218 if (len > 0) { 219 memcpy(urb_out->transfer_buffer, 220 runtime->dma_area + 221 line6pcm->pos_out * bytes_per_frame, 222 len * bytes_per_frame); 223 memcpy(urb_out->transfer_buffer + 224 len * bytes_per_frame, runtime->dma_area, 225 (urb_frames - len) * bytes_per_frame); 226 } else 227 dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", 228 len); 229 } else { 230 memcpy(urb_out->transfer_buffer, 231 runtime->dma_area + 232 line6pcm->pos_out * bytes_per_frame, 233 urb_out->transfer_buffer_length); 234 } 235 236 line6pcm->pos_out += urb_frames; 237 if (line6pcm->pos_out >= runtime->buffer_size) 238 line6pcm->pos_out -= runtime->buffer_size; 239 } else { 240 memset(urb_out->transfer_buffer, 0, 241 urb_out->transfer_buffer_length); 242 } 243 244 change_volume(urb_out, line6pcm->volume_playback, bytes_per_frame); 245 246 if (line6pcm->prev_fbuf != NULL) { 247 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 248 if (line6pcm->flags & LINE6_BITS_PCM_IMPULSE) { 249 create_impulse_test_signal(line6pcm, urb_out, 250 bytes_per_frame); 251 if (line6pcm->flags & 252 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM) { 253 line6_capture_copy(line6pcm, 254 urb_out->transfer_buffer, 255 urb_out-> 256 transfer_buffer_length); 257 line6_capture_check_period(line6pcm, 258 urb_out->transfer_buffer_length); 259 } 260 } else { 261 #endif 262 if (! 263 (line6pcm->line6-> 264 properties->capabilities & LINE6_CAP_HWMON) 265 && (line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM) 266 && (line6pcm->flags & LINE6_BITS_CAPTURE_STREAM)) 267 add_monitor_signal(urb_out, line6pcm->prev_fbuf, 268 line6pcm->volume_monitor, 269 bytes_per_frame); 270 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE 271 } 272 #endif 273 } 274 275 ret = usb_submit_urb(urb_out, GFP_ATOMIC); 276 277 if (ret == 0) 278 set_bit(index, &line6pcm->active_urb_out); 279 else 280 dev_err(line6pcm->line6->ifcdev, 281 "URB out #%d submission failed (%d)\n", index, ret); 282 283 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags); 284 return 0; 285 } 286 287 /* 288 Submit all currently available playback URBs. 289 */ 290 int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm) 291 { 292 int ret, i; 293 294 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 295 ret = submit_audio_out_urb(line6pcm); 296 if (ret < 0) 297 return ret; 298 } 299 300 return 0; 301 } 302 303 /* 304 Unlink all currently active playback URBs. 305 */ 306 void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm) 307 { 308 unsigned int i; 309 310 for (i = LINE6_ISO_BUFFERS; i--;) { 311 if (test_bit(i, &line6pcm->active_urb_out)) { 312 if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) { 313 struct urb *u = line6pcm->urb_audio_out[i]; 314 315 usb_unlink_urb(u); 316 } 317 } 318 } 319 } 320 321 /* 322 Wait until unlinking of all currently active playback URBs has been 323 finished. 324 */ 325 void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm) 326 { 327 int timeout = HZ; 328 unsigned int i; 329 int alive; 330 331 do { 332 alive = 0; 333 for (i = LINE6_ISO_BUFFERS; i--;) { 334 if (test_bit(i, &line6pcm->active_urb_out)) 335 alive++; 336 } 337 if (!alive) 338 break; 339 set_current_state(TASK_UNINTERRUPTIBLE); 340 schedule_timeout(1); 341 } while (--timeout > 0); 342 if (alive) 343 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); 344 } 345 346 /* 347 Unlink all currently active playback URBs, and wait for finishing. 348 */ 349 void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm) 350 { 351 line6_unlink_audio_out_urbs(line6pcm); 352 line6_wait_clear_audio_out_urbs(line6pcm); 353 } 354 355 void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm) 356 { 357 kfree(line6pcm->buffer_out); 358 line6pcm->buffer_out = NULL; 359 } 360 361 /* 362 Callback for completed playback URB. 363 */ 364 static void audio_out_callback(struct urb *urb) 365 { 366 int i, index, length = 0, shutdown = 0; 367 unsigned long flags; 368 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; 369 struct snd_pcm_substream *substream = 370 get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK); 371 372 #if USE_CLEAR_BUFFER_WORKAROUND 373 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 374 #endif 375 376 line6pcm->last_frame_out = urb->start_frame; 377 378 /* find index of URB */ 379 for (index = LINE6_ISO_BUFFERS; index--;) 380 if (urb == line6pcm->urb_audio_out[index]) 381 break; 382 383 if (index < 0) 384 return; /* URB has been unlinked asynchronously */ 385 386 for (i = LINE6_ISO_PACKETS; i--;) 387 length += urb->iso_frame_desc[i].length; 388 389 spin_lock_irqsave(&line6pcm->lock_audio_out, flags); 390 391 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, &line6pcm->flags)) { 392 struct snd_pcm_runtime *runtime = substream->runtime; 393 394 line6pcm->pos_out_done += 395 length / line6pcm->properties->bytes_per_frame; 396 397 if (line6pcm->pos_out_done >= runtime->buffer_size) 398 line6pcm->pos_out_done -= runtime->buffer_size; 399 } 400 401 clear_bit(index, &line6pcm->active_urb_out); 402 403 for (i = LINE6_ISO_PACKETS; i--;) 404 if (urb->iso_frame_desc[i].status == -EXDEV) { 405 shutdown = 1; 406 break; 407 } 408 409 if (test_and_clear_bit(index, &line6pcm->unlink_urb_out)) 410 shutdown = 1; 411 412 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags); 413 414 if (!shutdown) { 415 submit_audio_out_urb(line6pcm); 416 417 if (test_bit(LINE6_INDEX_PCM_ALSA_PLAYBACK_STREAM, 418 &line6pcm->flags)) { 419 line6pcm->bytes_out += length; 420 if (line6pcm->bytes_out >= line6pcm->period_out) { 421 line6pcm->bytes_out %= line6pcm->period_out; 422 snd_pcm_period_elapsed(substream); 423 } 424 } 425 } 426 } 427 428 /* open playback callback */ 429 static int snd_line6_playback_open(struct snd_pcm_substream *substream) 430 { 431 int err; 432 struct snd_pcm_runtime *runtime = substream->runtime; 433 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 434 435 err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 436 (&line6pcm-> 437 properties->snd_line6_rates)); 438 if (err < 0) 439 return err; 440 441 runtime->hw = line6pcm->properties->snd_line6_playback_hw; 442 return 0; 443 } 444 445 /* close playback callback */ 446 static int snd_line6_playback_close(struct snd_pcm_substream *substream) 447 { 448 return 0; 449 } 450 451 /* hw_params playback callback */ 452 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream, 453 struct snd_pcm_hw_params *hw_params) 454 { 455 int ret; 456 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 457 458 /* -- Florian Demski [FD] */ 459 /* don't ask me why, but this fixes the bug on my machine */ 460 if (line6pcm == NULL) { 461 if (substream->pcm == NULL) 462 return -ENOMEM; 463 if (substream->pcm->private_data == NULL) 464 return -ENOMEM; 465 substream->private_data = substream->pcm->private_data; 466 line6pcm = snd_pcm_substream_chip(substream); 467 } 468 /* -- [FD] end */ 469 470 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER); 471 472 if (ret < 0) 473 return ret; 474 475 ret = snd_pcm_lib_malloc_pages(substream, 476 params_buffer_bytes(hw_params)); 477 if (ret < 0) { 478 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER); 479 return ret; 480 } 481 482 line6pcm->period_out = params_period_bytes(hw_params); 483 return 0; 484 } 485 486 /* hw_free playback callback */ 487 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream) 488 { 489 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 490 491 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_PLAYBACK_BUFFER); 492 return snd_pcm_lib_free_pages(substream); 493 } 494 495 /* trigger playback callback */ 496 int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd) 497 { 498 int err; 499 500 switch (cmd) { 501 case SNDRV_PCM_TRIGGER_START: 502 #ifdef CONFIG_PM 503 case SNDRV_PCM_TRIGGER_RESUME: 504 #endif 505 err = line6_pcm_acquire(line6pcm, 506 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM); 507 508 if (err < 0) 509 return err; 510 511 break; 512 513 case SNDRV_PCM_TRIGGER_STOP: 514 #ifdef CONFIG_PM 515 case SNDRV_PCM_TRIGGER_SUSPEND: 516 #endif 517 err = line6_pcm_release(line6pcm, 518 LINE6_BIT_PCM_ALSA_PLAYBACK_STREAM); 519 520 if (err < 0) 521 return err; 522 523 break; 524 525 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 526 set_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags); 527 break; 528 529 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 530 clear_bit(LINE6_INDEX_PAUSE_PLAYBACK, &line6pcm->flags); 531 break; 532 533 default: 534 return -EINVAL; 535 } 536 537 return 0; 538 } 539 540 /* playback pointer callback */ 541 static snd_pcm_uframes_t 542 snd_line6_playback_pointer(struct snd_pcm_substream *substream) 543 { 544 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 545 546 return line6pcm->pos_out_done; 547 } 548 549 /* playback operators */ 550 struct snd_pcm_ops snd_line6_playback_ops = { 551 .open = snd_line6_playback_open, 552 .close = snd_line6_playback_close, 553 .ioctl = snd_pcm_lib_ioctl, 554 .hw_params = snd_line6_playback_hw_params, 555 .hw_free = snd_line6_playback_hw_free, 556 .prepare = snd_line6_prepare, 557 .trigger = snd_line6_trigger, 558 .pointer = snd_line6_playback_pointer, 559 }; 560 561 int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm) 562 { 563 struct usb_line6 *line6 = line6pcm->line6; 564 int i; 565 566 /* create audio URBs and fill in constant values: */ 567 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 568 struct urb *urb; 569 570 /* URB for audio out: */ 571 urb = line6pcm->urb_audio_out[i] = 572 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); 573 574 if (urb == NULL) { 575 dev_err(line6->ifcdev, "Out of memory\n"); 576 return -ENOMEM; 577 } 578 579 urb->dev = line6->usbdev; 580 urb->pipe = 581 usb_sndisocpipe(line6->usbdev, 582 line6->properties->ep_audio_w & 583 USB_ENDPOINT_NUMBER_MASK); 584 urb->transfer_flags = URB_ISO_ASAP; 585 urb->start_frame = -1; 586 urb->number_of_packets = LINE6_ISO_PACKETS; 587 urb->interval = LINE6_ISO_INTERVAL; 588 urb->error_count = 0; 589 urb->complete = audio_out_callback; 590 } 591 592 return 0; 593 } 594