Daniel Mack | e577999 | 2010-03-04 19:46:13 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | * You should have received a copy of the GNU General Public License |
| 13 | * along with this program; if not, write to the Free Software |
| 14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 15 | * |
| 16 | */ |
| 17 | |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 18 | #include <linux/gfp.h> |
| 19 | #include <linux/init.h> |
Takashi Iwai | 80c8a2a | 2012-01-09 11:37:20 +0100 | [diff] [blame^] | 20 | #include <linux/ratelimit.h> |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 21 | #include <linux/usb.h> |
| 22 | #include <linux/usb/audio.h> |
| 23 | |
| 24 | #include <sound/core.h> |
| 25 | #include <sound/pcm.h> |
| 26 | |
| 27 | #include "usbaudio.h" |
| 28 | #include "helper.h" |
| 29 | #include "card.h" |
| 30 | #include "endpoint.h" |
| 31 | #include "pcm.h" |
| 32 | |
| 33 | /* |
| 34 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
| 35 | * this will overflow at approx 524 kHz |
| 36 | */ |
| 37 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) |
| 38 | { |
| 39 | return ((rate << 13) + 62) / 125; |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
| 44 | * this will overflow at approx 4 MHz |
| 45 | */ |
| 46 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) |
| 47 | { |
| 48 | return ((rate << 10) + 62) / 125; |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * unlink active urbs. |
| 53 | */ |
| 54 | static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep) |
| 55 | { |
| 56 | struct snd_usb_audio *chip = subs->stream->chip; |
| 57 | unsigned int i; |
| 58 | int async; |
| 59 | |
| 60 | subs->running = 0; |
| 61 | |
| 62 | if (!force && subs->stream->chip->shutdown) /* to be sure... */ |
| 63 | return -EBADFD; |
| 64 | |
| 65 | async = !can_sleep && chip->async_unlink; |
| 66 | |
| 67 | if (!async && in_interrupt()) |
| 68 | return 0; |
| 69 | |
| 70 | for (i = 0; i < subs->nurbs; i++) { |
| 71 | if (test_bit(i, &subs->active_mask)) { |
| 72 | if (!test_and_set_bit(i, &subs->unlink_mask)) { |
| 73 | struct urb *u = subs->dataurb[i].urb; |
| 74 | if (async) |
| 75 | usb_unlink_urb(u); |
| 76 | else |
| 77 | usb_kill_urb(u); |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | if (subs->syncpipe) { |
| 82 | for (i = 0; i < SYNC_URBS; i++) { |
| 83 | if (test_bit(i+16, &subs->active_mask)) { |
| 84 | if (!test_and_set_bit(i+16, &subs->unlink_mask)) { |
| 85 | struct urb *u = subs->syncurb[i].urb; |
| 86 | if (async) |
| 87 | usb_unlink_urb(u); |
| 88 | else |
| 89 | usb_kill_urb(u); |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | |
| 98 | /* |
| 99 | * release a urb data |
| 100 | */ |
| 101 | static void release_urb_ctx(struct snd_urb_ctx *u) |
| 102 | { |
| 103 | if (u->urb) { |
| 104 | if (u->buffer_size) |
| 105 | usb_free_coherent(u->subs->dev, u->buffer_size, |
| 106 | u->urb->transfer_buffer, |
| 107 | u->urb->transfer_dma); |
| 108 | usb_free_urb(u->urb); |
| 109 | u->urb = NULL; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * wait until all urbs are processed. |
| 115 | */ |
| 116 | static int wait_clear_urbs(struct snd_usb_substream *subs) |
| 117 | { |
| 118 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
| 119 | unsigned int i; |
| 120 | int alive; |
| 121 | |
| 122 | do { |
| 123 | alive = 0; |
| 124 | for (i = 0; i < subs->nurbs; i++) { |
| 125 | if (test_bit(i, &subs->active_mask)) |
| 126 | alive++; |
| 127 | } |
| 128 | if (subs->syncpipe) { |
| 129 | for (i = 0; i < SYNC_URBS; i++) { |
| 130 | if (test_bit(i + 16, &subs->active_mask)) |
| 131 | alive++; |
| 132 | } |
| 133 | } |
| 134 | if (! alive) |
| 135 | break; |
| 136 | schedule_timeout_uninterruptible(1); |
| 137 | } while (time_before(jiffies, end_time)); |
| 138 | if (alive) |
| 139 | snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * release a substream |
| 145 | */ |
| 146 | void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) |
| 147 | { |
| 148 | int i; |
| 149 | |
| 150 | /* stop urbs (to be sure) */ |
| 151 | deactivate_urbs(subs, force, 1); |
| 152 | wait_clear_urbs(subs); |
| 153 | |
| 154 | for (i = 0; i < MAX_URBS; i++) |
| 155 | release_urb_ctx(&subs->dataurb[i]); |
| 156 | for (i = 0; i < SYNC_URBS; i++) |
| 157 | release_urb_ctx(&subs->syncurb[i]); |
| 158 | usb_free_coherent(subs->dev, SYNC_URBS * 4, |
| 159 | subs->syncbuf, subs->sync_dma); |
| 160 | subs->syncbuf = NULL; |
| 161 | subs->nurbs = 0; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * complete callback from data urb |
| 166 | */ |
| 167 | static void snd_complete_urb(struct urb *urb) |
| 168 | { |
| 169 | struct snd_urb_ctx *ctx = urb->context; |
| 170 | struct snd_usb_substream *subs = ctx->subs; |
| 171 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; |
| 172 | int err = 0; |
| 173 | |
| 174 | if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || |
| 175 | !subs->running || /* can be stopped during retire callback */ |
| 176 | (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || |
| 177 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { |
| 178 | clear_bit(ctx->index, &subs->active_mask); |
| 179 | if (err < 0) { |
| 180 | snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); |
| 181 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /* |
| 188 | * complete callback from sync urb |
| 189 | */ |
| 190 | static void snd_complete_sync_urb(struct urb *urb) |
| 191 | { |
| 192 | struct snd_urb_ctx *ctx = urb->context; |
| 193 | struct snd_usb_substream *subs = ctx->subs; |
| 194 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; |
| 195 | int err = 0; |
| 196 | |
| 197 | if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || |
| 198 | !subs->running || /* can be stopped during retire callback */ |
| 199 | (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || |
| 200 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { |
| 201 | clear_bit(ctx->index + 16, &subs->active_mask); |
| 202 | if (err < 0) { |
| 203 | snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); |
| 204 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | |
| 210 | /* |
| 211 | * initialize a substream for plaback/capture |
| 212 | */ |
| 213 | int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, |
| 214 | unsigned int period_bytes, |
| 215 | unsigned int rate, |
| 216 | unsigned int frame_bits) |
| 217 | { |
| 218 | unsigned int maxsize, i; |
| 219 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; |
| 220 | unsigned int urb_packs, total_packs, packs_per_ms; |
| 221 | struct snd_usb_audio *chip = subs->stream->chip; |
| 222 | |
| 223 | /* calculate the frequency in 16.16 format */ |
| 224 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) |
| 225 | subs->freqn = get_usb_full_speed_rate(rate); |
| 226 | else |
| 227 | subs->freqn = get_usb_high_speed_rate(rate); |
| 228 | subs->freqm = subs->freqn; |
| 229 | subs->freqshift = INT_MIN; |
| 230 | /* calculate max. frequency */ |
| 231 | if (subs->maxpacksize) { |
| 232 | /* whatever fits into a max. size packet */ |
| 233 | maxsize = subs->maxpacksize; |
| 234 | subs->freqmax = (maxsize / (frame_bits >> 3)) |
| 235 | << (16 - subs->datainterval); |
| 236 | } else { |
| 237 | /* no max. packet size: just take 25% higher than nominal */ |
| 238 | subs->freqmax = subs->freqn + (subs->freqn >> 2); |
| 239 | maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) |
| 240 | >> (16 - subs->datainterval); |
| 241 | } |
| 242 | subs->phase = 0; |
| 243 | |
| 244 | if (subs->fill_max) |
| 245 | subs->curpacksize = subs->maxpacksize; |
| 246 | else |
| 247 | subs->curpacksize = maxsize; |
| 248 | |
| 249 | if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) |
| 250 | packs_per_ms = 8 >> subs->datainterval; |
| 251 | else |
| 252 | packs_per_ms = 1; |
| 253 | |
| 254 | if (is_playback) { |
| 255 | urb_packs = max(chip->nrpacks, 1); |
| 256 | urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); |
| 257 | } else |
| 258 | urb_packs = 1; |
| 259 | urb_packs *= packs_per_ms; |
| 260 | if (subs->syncpipe) |
| 261 | urb_packs = min(urb_packs, 1U << subs->syncinterval); |
| 262 | |
| 263 | /* decide how many packets to be used */ |
| 264 | if (is_playback) { |
| 265 | unsigned int minsize, maxpacks; |
| 266 | /* determine how small a packet can be */ |
| 267 | minsize = (subs->freqn >> (16 - subs->datainterval)) |
| 268 | * (frame_bits >> 3); |
| 269 | /* with sync from device, assume it can be 12% lower */ |
| 270 | if (subs->syncpipe) |
| 271 | minsize -= minsize >> 3; |
| 272 | minsize = max(minsize, 1u); |
| 273 | total_packs = (period_bytes + minsize - 1) / minsize; |
| 274 | /* we need at least two URBs for queueing */ |
| 275 | if (total_packs < 2) { |
| 276 | total_packs = 2; |
| 277 | } else { |
| 278 | /* and we don't want too long a queue either */ |
| 279 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); |
| 280 | total_packs = min(total_packs, maxpacks); |
| 281 | } |
| 282 | } else { |
| 283 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) |
| 284 | urb_packs >>= 1; |
| 285 | total_packs = MAX_URBS * urb_packs; |
| 286 | } |
| 287 | subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; |
| 288 | if (subs->nurbs > MAX_URBS) { |
| 289 | /* too much... */ |
| 290 | subs->nurbs = MAX_URBS; |
| 291 | total_packs = MAX_URBS * urb_packs; |
| 292 | } else if (subs->nurbs < 2) { |
| 293 | /* too little - we need at least two packets |
| 294 | * to ensure contiguous playback/capture |
| 295 | */ |
| 296 | subs->nurbs = 2; |
| 297 | } |
| 298 | |
| 299 | /* allocate and initialize data urbs */ |
| 300 | for (i = 0; i < subs->nurbs; i++) { |
| 301 | struct snd_urb_ctx *u = &subs->dataurb[i]; |
| 302 | u->index = i; |
| 303 | u->subs = subs; |
| 304 | u->packets = (i + 1) * total_packs / subs->nurbs |
| 305 | - i * total_packs / subs->nurbs; |
| 306 | u->buffer_size = maxsize * u->packets; |
| 307 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) |
| 308 | u->packets++; /* for transfer delimiter */ |
| 309 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); |
| 310 | if (!u->urb) |
| 311 | goto out_of_memory; |
| 312 | u->urb->transfer_buffer = |
| 313 | usb_alloc_coherent(subs->dev, u->buffer_size, |
| 314 | GFP_KERNEL, &u->urb->transfer_dma); |
| 315 | if (!u->urb->transfer_buffer) |
| 316 | goto out_of_memory; |
| 317 | u->urb->pipe = subs->datapipe; |
| 318 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
| 319 | u->urb->interval = 1 << subs->datainterval; |
| 320 | u->urb->context = u; |
| 321 | u->urb->complete = snd_complete_urb; |
| 322 | } |
| 323 | |
| 324 | if (subs->syncpipe) { |
| 325 | /* allocate and initialize sync urbs */ |
| 326 | subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4, |
| 327 | GFP_KERNEL, &subs->sync_dma); |
| 328 | if (!subs->syncbuf) |
| 329 | goto out_of_memory; |
| 330 | for (i = 0; i < SYNC_URBS; i++) { |
| 331 | struct snd_urb_ctx *u = &subs->syncurb[i]; |
| 332 | u->index = i; |
| 333 | u->subs = subs; |
| 334 | u->packets = 1; |
| 335 | u->urb = usb_alloc_urb(1, GFP_KERNEL); |
| 336 | if (!u->urb) |
| 337 | goto out_of_memory; |
| 338 | u->urb->transfer_buffer = subs->syncbuf + i * 4; |
| 339 | u->urb->transfer_dma = subs->sync_dma + i * 4; |
| 340 | u->urb->transfer_buffer_length = 4; |
| 341 | u->urb->pipe = subs->syncpipe; |
| 342 | u->urb->transfer_flags = URB_ISO_ASAP | |
| 343 | URB_NO_TRANSFER_DMA_MAP; |
| 344 | u->urb->number_of_packets = 1; |
| 345 | u->urb->interval = 1 << subs->syncinterval; |
| 346 | u->urb->context = u; |
| 347 | u->urb->complete = snd_complete_sync_urb; |
| 348 | } |
| 349 | } |
| 350 | return 0; |
| 351 | |
| 352 | out_of_memory: |
| 353 | snd_usb_release_substream_urbs(subs, 0); |
| 354 | return -ENOMEM; |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * prepare urb for full speed capture sync pipe |
| 359 | * |
| 360 | * fill the length and offset of each urb descriptor. |
| 361 | * the fixed 10.14 frequency is passed through the pipe. |
| 362 | */ |
| 363 | static int prepare_capture_sync_urb(struct snd_usb_substream *subs, |
| 364 | struct snd_pcm_runtime *runtime, |
| 365 | struct urb *urb) |
| 366 | { |
| 367 | unsigned char *cp = urb->transfer_buffer; |
| 368 | struct snd_urb_ctx *ctx = urb->context; |
| 369 | |
| 370 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 371 | urb->iso_frame_desc[0].length = 3; |
| 372 | urb->iso_frame_desc[0].offset = 0; |
| 373 | cp[0] = subs->freqn >> 2; |
| 374 | cp[1] = subs->freqn >> 10; |
| 375 | cp[2] = subs->freqn >> 18; |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * prepare urb for high speed capture sync pipe |
| 381 | * |
| 382 | * fill the length and offset of each urb descriptor. |
| 383 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. |
| 384 | */ |
| 385 | static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, |
| 386 | struct snd_pcm_runtime *runtime, |
| 387 | struct urb *urb) |
| 388 | { |
| 389 | unsigned char *cp = urb->transfer_buffer; |
| 390 | struct snd_urb_ctx *ctx = urb->context; |
| 391 | |
| 392 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 393 | urb->iso_frame_desc[0].length = 4; |
| 394 | urb->iso_frame_desc[0].offset = 0; |
| 395 | cp[0] = subs->freqn; |
| 396 | cp[1] = subs->freqn >> 8; |
| 397 | cp[2] = subs->freqn >> 16; |
| 398 | cp[3] = subs->freqn >> 24; |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * process after capture sync complete |
| 404 | * - nothing to do |
| 405 | */ |
| 406 | static int retire_capture_sync_urb(struct snd_usb_substream *subs, |
| 407 | struct snd_pcm_runtime *runtime, |
| 408 | struct urb *urb) |
| 409 | { |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * prepare urb for capture data pipe |
| 415 | * |
| 416 | * fill the offset and length of each descriptor. |
| 417 | * |
| 418 | * we use a temporary buffer to write the captured data. |
| 419 | * since the length of written data is determined by host, we cannot |
| 420 | * write onto the pcm buffer directly... the data is thus copied |
| 421 | * later at complete callback to the global buffer. |
| 422 | */ |
| 423 | static int prepare_capture_urb(struct snd_usb_substream *subs, |
| 424 | struct snd_pcm_runtime *runtime, |
| 425 | struct urb *urb) |
| 426 | { |
| 427 | int i, offs; |
| 428 | struct snd_urb_ctx *ctx = urb->context; |
| 429 | |
| 430 | offs = 0; |
| 431 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 432 | for (i = 0; i < ctx->packets; i++) { |
| 433 | urb->iso_frame_desc[i].offset = offs; |
| 434 | urb->iso_frame_desc[i].length = subs->curpacksize; |
| 435 | offs += subs->curpacksize; |
| 436 | } |
| 437 | urb->transfer_buffer_length = offs; |
| 438 | urb->number_of_packets = ctx->packets; |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * process after capture complete |
| 444 | * |
| 445 | * copy the data from each desctiptor to the pcm buffer, and |
| 446 | * update the current position. |
| 447 | */ |
| 448 | static int retire_capture_urb(struct snd_usb_substream *subs, |
| 449 | struct snd_pcm_runtime *runtime, |
| 450 | struct urb *urb) |
| 451 | { |
| 452 | unsigned long flags; |
| 453 | unsigned char *cp; |
| 454 | int i; |
| 455 | unsigned int stride, frames, bytes, oldptr; |
| 456 | int period_elapsed = 0; |
| 457 | |
| 458 | stride = runtime->frame_bits >> 3; |
| 459 | |
| 460 | for (i = 0; i < urb->number_of_packets; i++) { |
| 461 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
Takashi Iwai | 80c8a2a | 2012-01-09 11:37:20 +0100 | [diff] [blame^] | 462 | if (urb->iso_frame_desc[i].status && printk_ratelimit()) { |
| 463 | snd_printdd("frame %d active: %d\n", i, urb->iso_frame_desc[i].status); |
Daniel Mack | c731bc9 | 2011-09-14 12:46:57 +0200 | [diff] [blame] | 464 | // continue; |
| 465 | } |
| 466 | bytes = urb->iso_frame_desc[i].actual_length; |
| 467 | frames = bytes / stride; |
| 468 | if (!subs->txfr_quirk) |
| 469 | bytes = frames * stride; |
| 470 | if (bytes % (runtime->sample_bits >> 3) != 0) { |
| 471 | #ifdef CONFIG_SND_DEBUG_VERBOSE |
| 472 | int oldbytes = bytes; |
| 473 | #endif |
| 474 | bytes = frames * stride; |
| 475 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", |
| 476 | oldbytes, bytes); |
| 477 | } |
| 478 | /* update the current pointer */ |
| 479 | spin_lock_irqsave(&subs->lock, flags); |
| 480 | oldptr = subs->hwptr_done; |
| 481 | subs->hwptr_done += bytes; |
| 482 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
| 483 | subs->hwptr_done -= runtime->buffer_size * stride; |
| 484 | frames = (bytes + (oldptr % stride)) / stride; |
| 485 | subs->transfer_done += frames; |
| 486 | if (subs->transfer_done >= runtime->period_size) { |
| 487 | subs->transfer_done -= runtime->period_size; |
| 488 | period_elapsed = 1; |
| 489 | } |
| 490 | spin_unlock_irqrestore(&subs->lock, flags); |
| 491 | /* copy a data chunk */ |
| 492 | if (oldptr + bytes > runtime->buffer_size * stride) { |
| 493 | unsigned int bytes1 = |
| 494 | runtime->buffer_size * stride - oldptr; |
| 495 | memcpy(runtime->dma_area + oldptr, cp, bytes1); |
| 496 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); |
| 497 | } else { |
| 498 | memcpy(runtime->dma_area + oldptr, cp, bytes); |
| 499 | } |
| 500 | } |
| 501 | if (period_elapsed) |
| 502 | snd_pcm_period_elapsed(subs->pcm_substream); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * Process after capture complete when paused. Nothing to do. |
| 508 | */ |
| 509 | static int retire_paused_capture_urb(struct snd_usb_substream *subs, |
| 510 | struct snd_pcm_runtime *runtime, |
| 511 | struct urb *urb) |
| 512 | { |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | |
| 517 | /* |
| 518 | * prepare urb for playback sync pipe |
| 519 | * |
| 520 | * set up the offset and length to receive the current frequency. |
| 521 | */ |
| 522 | static int prepare_playback_sync_urb(struct snd_usb_substream *subs, |
| 523 | struct snd_pcm_runtime *runtime, |
| 524 | struct urb *urb) |
| 525 | { |
| 526 | struct snd_urb_ctx *ctx = urb->context; |
| 527 | |
| 528 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 529 | urb->iso_frame_desc[0].length = min(4u, ctx->subs->syncmaxsize); |
| 530 | urb->iso_frame_desc[0].offset = 0; |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * process after playback sync complete |
| 536 | * |
| 537 | * Full speed devices report feedback values in 10.14 format as samples per |
| 538 | * frame, high speed devices in 16.16 format as samples per microframe. |
| 539 | * Because the Audio Class 1 spec was written before USB 2.0, many high speed |
| 540 | * devices use a wrong interpretation, some others use an entirely different |
| 541 | * format. Therefore, we cannot predict what format any particular device uses |
| 542 | * and must detect it automatically. |
| 543 | */ |
| 544 | static int retire_playback_sync_urb(struct snd_usb_substream *subs, |
| 545 | struct snd_pcm_runtime *runtime, |
| 546 | struct urb *urb) |
| 547 | { |
| 548 | unsigned int f; |
| 549 | int shift; |
| 550 | unsigned long flags; |
| 551 | |
| 552 | if (urb->iso_frame_desc[0].status != 0 || |
| 553 | urb->iso_frame_desc[0].actual_length < 3) |
| 554 | return 0; |
| 555 | |
| 556 | f = le32_to_cpup(urb->transfer_buffer); |
| 557 | if (urb->iso_frame_desc[0].actual_length == 3) |
| 558 | f &= 0x00ffffff; |
| 559 | else |
| 560 | f &= 0x0fffffff; |
| 561 | if (f == 0) |
| 562 | return 0; |
| 563 | |
| 564 | if (unlikely(subs->freqshift == INT_MIN)) { |
| 565 | /* |
| 566 | * The first time we see a feedback value, determine its format |
| 567 | * by shifting it left or right until it matches the nominal |
| 568 | * frequency value. This assumes that the feedback does not |
| 569 | * differ from the nominal value more than +50% or -25%. |
| 570 | */ |
| 571 | shift = 0; |
| 572 | while (f < subs->freqn - subs->freqn / 4) { |
| 573 | f <<= 1; |
| 574 | shift++; |
| 575 | } |
| 576 | while (f > subs->freqn + subs->freqn / 2) { |
| 577 | f >>= 1; |
| 578 | shift--; |
| 579 | } |
| 580 | subs->freqshift = shift; |
| 581 | } |
| 582 | else if (subs->freqshift >= 0) |
| 583 | f <<= subs->freqshift; |
| 584 | else |
| 585 | f >>= -subs->freqshift; |
| 586 | |
| 587 | if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax)) { |
| 588 | /* |
| 589 | * If the frequency looks valid, set it. |
| 590 | * This value is referred to in prepare_playback_urb(). |
| 591 | */ |
| 592 | spin_lock_irqsave(&subs->lock, flags); |
| 593 | subs->freqm = f; |
| 594 | spin_unlock_irqrestore(&subs->lock, flags); |
| 595 | } else { |
| 596 | /* |
| 597 | * Out of range; maybe the shift value is wrong. |
| 598 | * Reset it so that we autodetect again the next time. |
| 599 | */ |
| 600 | subs->freqshift = INT_MIN; |
| 601 | } |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | /* determine the number of frames in the next packet */ |
| 607 | static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) |
| 608 | { |
| 609 | if (subs->fill_max) |
| 610 | return subs->maxframesize; |
| 611 | else { |
| 612 | subs->phase = (subs->phase & 0xffff) |
| 613 | + (subs->freqm << subs->datainterval); |
| 614 | return min(subs->phase >> 16, subs->maxframesize); |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Prepare urb for streaming before playback starts or when paused. |
| 620 | * |
| 621 | * We don't have any data, so we send silence. |
| 622 | */ |
| 623 | static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, |
| 624 | struct snd_pcm_runtime *runtime, |
| 625 | struct urb *urb) |
| 626 | { |
| 627 | unsigned int i, offs, counts; |
| 628 | struct snd_urb_ctx *ctx = urb->context; |
| 629 | int stride = runtime->frame_bits >> 3; |
| 630 | |
| 631 | offs = 0; |
| 632 | urb->dev = ctx->subs->dev; |
| 633 | for (i = 0; i < ctx->packets; ++i) { |
| 634 | counts = snd_usb_audio_next_packet_size(subs); |
| 635 | urb->iso_frame_desc[i].offset = offs * stride; |
| 636 | urb->iso_frame_desc[i].length = counts * stride; |
| 637 | offs += counts; |
| 638 | } |
| 639 | urb->number_of_packets = ctx->packets; |
| 640 | urb->transfer_buffer_length = offs * stride; |
| 641 | memset(urb->transfer_buffer, |
| 642 | runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, |
| 643 | offs * stride); |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * prepare urb for playback data pipe |
| 649 | * |
| 650 | * Since a URB can handle only a single linear buffer, we must use double |
| 651 | * buffering when the data to be transferred overflows the buffer boundary. |
| 652 | * To avoid inconsistencies when updating hwptr_done, we use double buffering |
| 653 | * for all URBs. |
| 654 | */ |
| 655 | static int prepare_playback_urb(struct snd_usb_substream *subs, |
| 656 | struct snd_pcm_runtime *runtime, |
| 657 | struct urb *urb) |
| 658 | { |
| 659 | int i, stride; |
| 660 | unsigned int counts, frames, bytes; |
| 661 | unsigned long flags; |
| 662 | int period_elapsed = 0; |
| 663 | struct snd_urb_ctx *ctx = urb->context; |
| 664 | |
| 665 | stride = runtime->frame_bits >> 3; |
| 666 | |
| 667 | frames = 0; |
| 668 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 669 | urb->number_of_packets = 0; |
| 670 | spin_lock_irqsave(&subs->lock, flags); |
| 671 | for (i = 0; i < ctx->packets; i++) { |
| 672 | counts = snd_usb_audio_next_packet_size(subs); |
| 673 | /* set up descriptor */ |
| 674 | urb->iso_frame_desc[i].offset = frames * stride; |
| 675 | urb->iso_frame_desc[i].length = counts * stride; |
| 676 | frames += counts; |
| 677 | urb->number_of_packets++; |
| 678 | subs->transfer_done += counts; |
| 679 | if (subs->transfer_done >= runtime->period_size) { |
| 680 | subs->transfer_done -= runtime->period_size; |
| 681 | period_elapsed = 1; |
| 682 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { |
| 683 | if (subs->transfer_done > 0) { |
| 684 | /* FIXME: fill-max mode is not |
| 685 | * supported yet */ |
| 686 | frames -= subs->transfer_done; |
| 687 | counts -= subs->transfer_done; |
| 688 | urb->iso_frame_desc[i].length = |
| 689 | counts * stride; |
| 690 | subs->transfer_done = 0; |
| 691 | } |
| 692 | i++; |
| 693 | if (i < ctx->packets) { |
| 694 | /* add a transfer delimiter */ |
| 695 | urb->iso_frame_desc[i].offset = |
| 696 | frames * stride; |
| 697 | urb->iso_frame_desc[i].length = 0; |
| 698 | urb->number_of_packets++; |
| 699 | } |
| 700 | break; |
| 701 | } |
| 702 | } |
| 703 | if (period_elapsed) /* finish at the period boundary */ |
| 704 | break; |
| 705 | } |
| 706 | bytes = frames * stride; |
| 707 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { |
| 708 | /* err, the transferred area goes over buffer boundary. */ |
| 709 | unsigned int bytes1 = |
| 710 | runtime->buffer_size * stride - subs->hwptr_done; |
| 711 | memcpy(urb->transfer_buffer, |
| 712 | runtime->dma_area + subs->hwptr_done, bytes1); |
| 713 | memcpy(urb->transfer_buffer + bytes1, |
| 714 | runtime->dma_area, bytes - bytes1); |
| 715 | } else { |
| 716 | memcpy(urb->transfer_buffer, |
| 717 | runtime->dma_area + subs->hwptr_done, bytes); |
| 718 | } |
| 719 | subs->hwptr_done += bytes; |
| 720 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
| 721 | subs->hwptr_done -= runtime->buffer_size * stride; |
| 722 | |
| 723 | /* update delay with exact number of samples queued */ |
| 724 | runtime->delay = subs->last_delay; |
| 725 | runtime->delay += frames; |
| 726 | subs->last_delay = runtime->delay; |
| 727 | |
| 728 | /* realign last_frame_number */ |
| 729 | subs->last_frame_number = usb_get_current_frame_number(subs->dev); |
| 730 | subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ |
| 731 | |
| 732 | spin_unlock_irqrestore(&subs->lock, flags); |
| 733 | urb->transfer_buffer_length = bytes; |
| 734 | if (period_elapsed) |
| 735 | snd_pcm_period_elapsed(subs->pcm_substream); |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | /* |
| 740 | * process after playback data complete |
| 741 | * - decrease the delay count again |
| 742 | */ |
| 743 | static int retire_playback_urb(struct snd_usb_substream *subs, |
| 744 | struct snd_pcm_runtime *runtime, |
| 745 | struct urb *urb) |
| 746 | { |
| 747 | unsigned long flags; |
| 748 | int stride = runtime->frame_bits >> 3; |
| 749 | int processed = urb->transfer_buffer_length / stride; |
| 750 | int est_delay; |
| 751 | |
| 752 | spin_lock_irqsave(&subs->lock, flags); |
| 753 | |
| 754 | est_delay = snd_usb_pcm_delay(subs, runtime->rate); |
| 755 | /* update delay with exact number of samples played */ |
| 756 | if (processed > subs->last_delay) |
| 757 | subs->last_delay = 0; |
| 758 | else |
| 759 | subs->last_delay -= processed; |
| 760 | runtime->delay = subs->last_delay; |
| 761 | |
| 762 | /* |
| 763 | * Report when delay estimate is off by more than 2ms. |
| 764 | * The error should be lower than 2ms since the estimate relies |
| 765 | * on two reads of a counter updated every ms. |
| 766 | */ |
| 767 | if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) |
| 768 | snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", |
| 769 | est_delay, subs->last_delay); |
| 770 | |
| 771 | spin_unlock_irqrestore(&subs->lock, flags); |
| 772 | return 0; |
| 773 | } |
| 774 | |
| 775 | static const char *usb_error_string(int err) |
| 776 | { |
| 777 | switch (err) { |
| 778 | case -ENODEV: |
| 779 | return "no device"; |
| 780 | case -ENOENT: |
| 781 | return "endpoint not enabled"; |
| 782 | case -EPIPE: |
| 783 | return "endpoint stalled"; |
| 784 | case -ENOSPC: |
| 785 | return "not enough bandwidth"; |
| 786 | case -ESHUTDOWN: |
| 787 | return "device disabled"; |
| 788 | case -EHOSTUNREACH: |
| 789 | return "device suspended"; |
| 790 | case -EINVAL: |
| 791 | case -EAGAIN: |
| 792 | case -EFBIG: |
| 793 | case -EMSGSIZE: |
| 794 | return "internal error"; |
| 795 | default: |
| 796 | return "unknown error"; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * set up and start data/sync urbs |
| 802 | */ |
| 803 | static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) |
| 804 | { |
| 805 | unsigned int i; |
| 806 | int err; |
| 807 | |
| 808 | if (subs->stream->chip->shutdown) |
| 809 | return -EBADFD; |
| 810 | |
| 811 | for (i = 0; i < subs->nurbs; i++) { |
| 812 | if (snd_BUG_ON(!subs->dataurb[i].urb)) |
| 813 | return -EINVAL; |
| 814 | if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { |
| 815 | snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); |
| 816 | goto __error; |
| 817 | } |
| 818 | } |
| 819 | if (subs->syncpipe) { |
| 820 | for (i = 0; i < SYNC_URBS; i++) { |
| 821 | if (snd_BUG_ON(!subs->syncurb[i].urb)) |
| 822 | return -EINVAL; |
| 823 | if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { |
| 824 | snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); |
| 825 | goto __error; |
| 826 | } |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | subs->active_mask = 0; |
| 831 | subs->unlink_mask = 0; |
| 832 | subs->running = 1; |
| 833 | for (i = 0; i < subs->nurbs; i++) { |
| 834 | err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); |
| 835 | if (err < 0) { |
| 836 | snd_printk(KERN_ERR "cannot submit datapipe " |
| 837 | "for urb %d, error %d: %s\n", |
| 838 | i, err, usb_error_string(err)); |
| 839 | goto __error; |
| 840 | } |
| 841 | set_bit(i, &subs->active_mask); |
| 842 | } |
| 843 | if (subs->syncpipe) { |
| 844 | for (i = 0; i < SYNC_URBS; i++) { |
| 845 | err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); |
| 846 | if (err < 0) { |
| 847 | snd_printk(KERN_ERR "cannot submit syncpipe " |
| 848 | "for urb %d, error %d: %s\n", |
| 849 | i, err, usb_error_string(err)); |
| 850 | goto __error; |
| 851 | } |
| 852 | set_bit(i + 16, &subs->active_mask); |
| 853 | } |
| 854 | } |
| 855 | return 0; |
| 856 | |
| 857 | __error: |
| 858 | // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); |
| 859 | deactivate_urbs(subs, 0, 0); |
| 860 | return -EPIPE; |
| 861 | } |
| 862 | |
| 863 | |
| 864 | /* |
| 865 | */ |
| 866 | static struct snd_urb_ops audio_urb_ops[2] = { |
| 867 | { |
| 868 | .prepare = prepare_nodata_playback_urb, |
| 869 | .retire = retire_playback_urb, |
| 870 | .prepare_sync = prepare_playback_sync_urb, |
| 871 | .retire_sync = retire_playback_sync_urb, |
| 872 | }, |
| 873 | { |
| 874 | .prepare = prepare_capture_urb, |
| 875 | .retire = retire_capture_urb, |
| 876 | .prepare_sync = prepare_capture_sync_urb, |
| 877 | .retire_sync = retire_capture_sync_urb, |
| 878 | }, |
| 879 | }; |
| 880 | |
| 881 | /* |
| 882 | * initialize the substream instance. |
| 883 | */ |
| 884 | |
| 885 | void snd_usb_init_substream(struct snd_usb_stream *as, |
| 886 | int stream, struct audioformat *fp) |
| 887 | { |
| 888 | struct snd_usb_substream *subs = &as->substream[stream]; |
| 889 | |
| 890 | INIT_LIST_HEAD(&subs->fmt_list); |
| 891 | spin_lock_init(&subs->lock); |
| 892 | |
| 893 | subs->stream = as; |
| 894 | subs->direction = stream; |
| 895 | subs->dev = as->chip->dev; |
| 896 | subs->txfr_quirk = as->chip->txfr_quirk; |
| 897 | subs->ops = audio_urb_ops[stream]; |
| 898 | if (snd_usb_get_speed(subs->dev) >= USB_SPEED_HIGH) |
| 899 | subs->ops.prepare_sync = prepare_capture_sync_urb_hs; |
| 900 | |
| 901 | snd_usb_set_pcm_ops(as->pcm, stream); |
| 902 | |
| 903 | list_add_tail(&fp->list, &subs->fmt_list); |
| 904 | subs->formats |= fp->formats; |
| 905 | subs->endpoint = fp->endpoint; |
| 906 | subs->num_formats++; |
| 907 | subs->fmt_type = fp->fmt_type; |
| 908 | } |
| 909 | |
| 910 | int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
| 911 | { |
| 912 | struct snd_usb_substream *subs = substream->runtime->private_data; |
| 913 | |
| 914 | switch (cmd) { |
| 915 | case SNDRV_PCM_TRIGGER_START: |
| 916 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 917 | subs->ops.prepare = prepare_playback_urb; |
| 918 | return 0; |
| 919 | case SNDRV_PCM_TRIGGER_STOP: |
| 920 | return deactivate_urbs(subs, 0, 0); |
| 921 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 922 | subs->ops.prepare = prepare_nodata_playback_urb; |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | return -EINVAL; |
| 927 | } |
| 928 | |
| 929 | int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
| 930 | { |
| 931 | struct snd_usb_substream *subs = substream->runtime->private_data; |
| 932 | |
| 933 | switch (cmd) { |
| 934 | case SNDRV_PCM_TRIGGER_START: |
| 935 | subs->ops.retire = retire_capture_urb; |
| 936 | return start_urbs(subs, substream->runtime); |
| 937 | case SNDRV_PCM_TRIGGER_STOP: |
| 938 | return deactivate_urbs(subs, 0, 0); |
| 939 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 940 | subs->ops.retire = retire_paused_capture_urb; |
| 941 | return 0; |
| 942 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 943 | subs->ops.retire = retire_capture_urb; |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | return -EINVAL; |
| 948 | } |
| 949 | |
| 950 | int snd_usb_substream_prepare(struct snd_usb_substream *subs, |
| 951 | struct snd_pcm_runtime *runtime) |
| 952 | { |
| 953 | /* clear urbs (to be sure) */ |
| 954 | deactivate_urbs(subs, 0, 1); |
| 955 | wait_clear_urbs(subs); |
| 956 | |
| 957 | /* for playback, submit the URBs now; otherwise, the first hwptr_done |
| 958 | * updates for all URBs would happen at the same time when starting */ |
| 959 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { |
| 960 | subs->ops.prepare = prepare_nodata_playback_urb; |
| 961 | return start_urbs(subs, runtime); |
| 962 | } |
| 963 | |
| 964 | return 0; |
| 965 | } |
| 966 | |