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 | |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/usb.h> |
| 20 | #include <linux/usb/audio.h> |
| 21 | |
| 22 | #include <sound/core.h> |
| 23 | #include <sound/pcm.h> |
| 24 | |
| 25 | #include "usbaudio.h" |
| 26 | #include "helper.h" |
| 27 | #include "card.h" |
| 28 | #include "urb.h" |
| 29 | #include "pcm.h" |
| 30 | |
| 31 | /* |
| 32 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
| 33 | * this will overflow at approx 524 kHz |
| 34 | */ |
| 35 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) |
| 36 | { |
| 37 | return ((rate << 13) + 62) / 125; |
| 38 | } |
| 39 | |
| 40 | /* |
| 41 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
| 42 | * this will overflow at approx 4 MHz |
| 43 | */ |
| 44 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) |
| 45 | { |
| 46 | return ((rate << 10) + 62) / 125; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * unlink active urbs. |
| 51 | */ |
| 52 | static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep) |
| 53 | { |
| 54 | struct snd_usb_audio *chip = subs->stream->chip; |
| 55 | unsigned int i; |
| 56 | int async; |
| 57 | |
| 58 | subs->running = 0; |
| 59 | |
| 60 | if (!force && subs->stream->chip->shutdown) /* to be sure... */ |
| 61 | return -EBADFD; |
| 62 | |
| 63 | async = !can_sleep && chip->async_unlink; |
| 64 | |
| 65 | if (!async && in_interrupt()) |
| 66 | return 0; |
| 67 | |
| 68 | for (i = 0; i < subs->nurbs; i++) { |
| 69 | if (test_bit(i, &subs->active_mask)) { |
| 70 | if (!test_and_set_bit(i, &subs->unlink_mask)) { |
| 71 | struct urb *u = subs->dataurb[i].urb; |
| 72 | if (async) |
| 73 | usb_unlink_urb(u); |
| 74 | else |
| 75 | usb_kill_urb(u); |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | if (subs->syncpipe) { |
| 80 | for (i = 0; i < SYNC_URBS; i++) { |
| 81 | if (test_bit(i+16, &subs->active_mask)) { |
| 82 | if (!test_and_set_bit(i+16, &subs->unlink_mask)) { |
| 83 | struct urb *u = subs->syncurb[i].urb; |
| 84 | if (async) |
| 85 | usb_unlink_urb(u); |
| 86 | else |
| 87 | usb_kill_urb(u); |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | /* |
| 97 | * release a urb data |
| 98 | */ |
| 99 | static void release_urb_ctx(struct snd_urb_ctx *u) |
| 100 | { |
| 101 | if (u->urb) { |
| 102 | if (u->buffer_size) |
| 103 | usb_buffer_free(u->subs->dev, u->buffer_size, |
| 104 | u->urb->transfer_buffer, |
| 105 | u->urb->transfer_dma); |
| 106 | usb_free_urb(u->urb); |
| 107 | u->urb = NULL; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * wait until all urbs are processed. |
| 113 | */ |
| 114 | static int wait_clear_urbs(struct snd_usb_substream *subs) |
| 115 | { |
| 116 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
| 117 | unsigned int i; |
| 118 | int alive; |
| 119 | |
| 120 | do { |
| 121 | alive = 0; |
| 122 | for (i = 0; i < subs->nurbs; i++) { |
| 123 | if (test_bit(i, &subs->active_mask)) |
| 124 | alive++; |
| 125 | } |
| 126 | if (subs->syncpipe) { |
| 127 | for (i = 0; i < SYNC_URBS; i++) { |
| 128 | if (test_bit(i + 16, &subs->active_mask)) |
| 129 | alive++; |
| 130 | } |
| 131 | } |
| 132 | if (! alive) |
| 133 | break; |
| 134 | schedule_timeout_uninterruptible(1); |
| 135 | } while (time_before(jiffies, end_time)); |
| 136 | if (alive) |
| 137 | snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * release a substream |
| 143 | */ |
| 144 | void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) |
| 145 | { |
| 146 | int i; |
| 147 | |
| 148 | /* stop urbs (to be sure) */ |
| 149 | deactivate_urbs(subs, force, 1); |
| 150 | wait_clear_urbs(subs); |
| 151 | |
| 152 | for (i = 0; i < MAX_URBS; i++) |
| 153 | release_urb_ctx(&subs->dataurb[i]); |
| 154 | for (i = 0; i < SYNC_URBS; i++) |
| 155 | release_urb_ctx(&subs->syncurb[i]); |
| 156 | usb_buffer_free(subs->dev, SYNC_URBS * 4, |
| 157 | subs->syncbuf, subs->sync_dma); |
| 158 | subs->syncbuf = NULL; |
| 159 | subs->nurbs = 0; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * complete callback from data urb |
| 164 | */ |
| 165 | static void snd_complete_urb(struct urb *urb) |
| 166 | { |
| 167 | struct snd_urb_ctx *ctx = urb->context; |
| 168 | struct snd_usb_substream *subs = ctx->subs; |
| 169 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; |
| 170 | int err = 0; |
| 171 | |
| 172 | if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || |
| 173 | !subs->running || /* can be stopped during retire callback */ |
| 174 | (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || |
| 175 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { |
| 176 | clear_bit(ctx->index, &subs->active_mask); |
| 177 | if (err < 0) { |
| 178 | snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); |
| 179 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | |
| 185 | /* |
| 186 | * complete callback from sync urb |
| 187 | */ |
| 188 | static void snd_complete_sync_urb(struct urb *urb) |
| 189 | { |
| 190 | struct snd_urb_ctx *ctx = urb->context; |
| 191 | struct snd_usb_substream *subs = ctx->subs; |
| 192 | struct snd_pcm_substream *substream = ctx->subs->pcm_substream; |
| 193 | int err = 0; |
| 194 | |
| 195 | if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || |
| 196 | !subs->running || /* can be stopped during retire callback */ |
| 197 | (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || |
| 198 | (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { |
| 199 | clear_bit(ctx->index + 16, &subs->active_mask); |
| 200 | if (err < 0) { |
| 201 | snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); |
| 202 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| 203 | } |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | |
| 208 | /* |
| 209 | * initialize a substream for plaback/capture |
| 210 | */ |
| 211 | int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, |
| 212 | unsigned int period_bytes, |
| 213 | unsigned int rate, |
| 214 | unsigned int frame_bits) |
| 215 | { |
| 216 | unsigned int maxsize, i; |
| 217 | int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; |
| 218 | unsigned int urb_packs, total_packs, packs_per_ms; |
| 219 | struct snd_usb_audio *chip = subs->stream->chip; |
| 220 | |
| 221 | /* calculate the frequency in 16.16 format */ |
| 222 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) |
| 223 | subs->freqn = get_usb_full_speed_rate(rate); |
| 224 | else |
| 225 | subs->freqn = get_usb_high_speed_rate(rate); |
| 226 | subs->freqm = subs->freqn; |
| 227 | /* calculate max. frequency */ |
| 228 | if (subs->maxpacksize) { |
| 229 | /* whatever fits into a max. size packet */ |
| 230 | maxsize = subs->maxpacksize; |
| 231 | subs->freqmax = (maxsize / (frame_bits >> 3)) |
| 232 | << (16 - subs->datainterval); |
| 233 | } else { |
| 234 | /* no max. packet size: just take 25% higher than nominal */ |
| 235 | subs->freqmax = subs->freqn + (subs->freqn >> 2); |
| 236 | maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) |
| 237 | >> (16 - subs->datainterval); |
| 238 | } |
| 239 | subs->phase = 0; |
| 240 | |
| 241 | if (subs->fill_max) |
| 242 | subs->curpacksize = subs->maxpacksize; |
| 243 | else |
| 244 | subs->curpacksize = maxsize; |
| 245 | |
| 246 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) |
| 247 | packs_per_ms = 8 >> subs->datainterval; |
| 248 | else |
| 249 | packs_per_ms = 1; |
| 250 | |
| 251 | if (is_playback) { |
| 252 | urb_packs = max(chip->nrpacks, 1); |
| 253 | urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); |
| 254 | } else |
| 255 | urb_packs = 1; |
| 256 | urb_packs *= packs_per_ms; |
| 257 | if (subs->syncpipe) |
| 258 | urb_packs = min(urb_packs, 1U << subs->syncinterval); |
| 259 | |
| 260 | /* decide how many packets to be used */ |
| 261 | if (is_playback) { |
| 262 | unsigned int minsize, maxpacks; |
| 263 | /* determine how small a packet can be */ |
| 264 | minsize = (subs->freqn >> (16 - subs->datainterval)) |
| 265 | * (frame_bits >> 3); |
| 266 | /* with sync from device, assume it can be 12% lower */ |
| 267 | if (subs->syncpipe) |
| 268 | minsize -= minsize >> 3; |
| 269 | minsize = max(minsize, 1u); |
| 270 | total_packs = (period_bytes + minsize - 1) / minsize; |
| 271 | /* we need at least two URBs for queueing */ |
| 272 | if (total_packs < 2) { |
| 273 | total_packs = 2; |
| 274 | } else { |
| 275 | /* and we don't want too long a queue either */ |
| 276 | maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); |
| 277 | total_packs = min(total_packs, maxpacks); |
| 278 | } |
| 279 | } else { |
| 280 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) |
| 281 | urb_packs >>= 1; |
| 282 | total_packs = MAX_URBS * urb_packs; |
| 283 | } |
| 284 | subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; |
| 285 | if (subs->nurbs > MAX_URBS) { |
| 286 | /* too much... */ |
| 287 | subs->nurbs = MAX_URBS; |
| 288 | total_packs = MAX_URBS * urb_packs; |
| 289 | } else if (subs->nurbs < 2) { |
| 290 | /* too little - we need at least two packets |
| 291 | * to ensure contiguous playback/capture |
| 292 | */ |
| 293 | subs->nurbs = 2; |
| 294 | } |
| 295 | |
| 296 | /* allocate and initialize data urbs */ |
| 297 | for (i = 0; i < subs->nurbs; i++) { |
| 298 | struct snd_urb_ctx *u = &subs->dataurb[i]; |
| 299 | u->index = i; |
| 300 | u->subs = subs; |
| 301 | u->packets = (i + 1) * total_packs / subs->nurbs |
| 302 | - i * total_packs / subs->nurbs; |
| 303 | u->buffer_size = maxsize * u->packets; |
| 304 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) |
| 305 | u->packets++; /* for transfer delimiter */ |
| 306 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); |
| 307 | if (!u->urb) |
| 308 | goto out_of_memory; |
| 309 | u->urb->transfer_buffer = |
| 310 | usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL, |
| 311 | &u->urb->transfer_dma); |
| 312 | if (!u->urb->transfer_buffer) |
| 313 | goto out_of_memory; |
| 314 | u->urb->pipe = subs->datapipe; |
| 315 | u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
| 316 | u->urb->interval = 1 << subs->datainterval; |
| 317 | u->urb->context = u; |
| 318 | u->urb->complete = snd_complete_urb; |
| 319 | } |
| 320 | |
| 321 | if (subs->syncpipe) { |
| 322 | /* allocate and initialize sync urbs */ |
| 323 | subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4, |
| 324 | GFP_KERNEL, &subs->sync_dma); |
| 325 | if (!subs->syncbuf) |
| 326 | goto out_of_memory; |
| 327 | for (i = 0; i < SYNC_URBS; i++) { |
| 328 | struct snd_urb_ctx *u = &subs->syncurb[i]; |
| 329 | u->index = i; |
| 330 | u->subs = subs; |
| 331 | u->packets = 1; |
| 332 | u->urb = usb_alloc_urb(1, GFP_KERNEL); |
| 333 | if (!u->urb) |
| 334 | goto out_of_memory; |
| 335 | u->urb->transfer_buffer = subs->syncbuf + i * 4; |
| 336 | u->urb->transfer_dma = subs->sync_dma + i * 4; |
| 337 | u->urb->transfer_buffer_length = 4; |
| 338 | u->urb->pipe = subs->syncpipe; |
| 339 | u->urb->transfer_flags = URB_ISO_ASAP | |
| 340 | URB_NO_TRANSFER_DMA_MAP; |
| 341 | u->urb->number_of_packets = 1; |
| 342 | u->urb->interval = 1 << subs->syncinterval; |
| 343 | u->urb->context = u; |
| 344 | u->urb->complete = snd_complete_sync_urb; |
| 345 | } |
| 346 | } |
| 347 | return 0; |
| 348 | |
| 349 | out_of_memory: |
| 350 | snd_usb_release_substream_urbs(subs, 0); |
| 351 | return -ENOMEM; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * prepare urb for full speed capture sync pipe |
| 356 | * |
| 357 | * fill the length and offset of each urb descriptor. |
| 358 | * the fixed 10.14 frequency is passed through the pipe. |
| 359 | */ |
| 360 | static int prepare_capture_sync_urb(struct snd_usb_substream *subs, |
| 361 | struct snd_pcm_runtime *runtime, |
| 362 | struct urb *urb) |
| 363 | { |
| 364 | unsigned char *cp = urb->transfer_buffer; |
| 365 | struct snd_urb_ctx *ctx = urb->context; |
| 366 | |
| 367 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 368 | urb->iso_frame_desc[0].length = 3; |
| 369 | urb->iso_frame_desc[0].offset = 0; |
| 370 | cp[0] = subs->freqn >> 2; |
| 371 | cp[1] = subs->freqn >> 10; |
| 372 | cp[2] = subs->freqn >> 18; |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * prepare urb for high speed capture sync pipe |
| 378 | * |
| 379 | * fill the length and offset of each urb descriptor. |
| 380 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. |
| 381 | */ |
| 382 | static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, |
| 383 | struct snd_pcm_runtime *runtime, |
| 384 | struct urb *urb) |
| 385 | { |
| 386 | unsigned char *cp = urb->transfer_buffer; |
| 387 | struct snd_urb_ctx *ctx = urb->context; |
| 388 | |
| 389 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 390 | urb->iso_frame_desc[0].length = 4; |
| 391 | urb->iso_frame_desc[0].offset = 0; |
| 392 | cp[0] = subs->freqn; |
| 393 | cp[1] = subs->freqn >> 8; |
| 394 | cp[2] = subs->freqn >> 16; |
| 395 | cp[3] = subs->freqn >> 24; |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | /* |
| 400 | * process after capture sync complete |
| 401 | * - nothing to do |
| 402 | */ |
| 403 | static int retire_capture_sync_urb(struct snd_usb_substream *subs, |
| 404 | struct snd_pcm_runtime *runtime, |
| 405 | struct urb *urb) |
| 406 | { |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * prepare urb for capture data pipe |
| 412 | * |
| 413 | * fill the offset and length of each descriptor. |
| 414 | * |
| 415 | * we use a temporary buffer to write the captured data. |
| 416 | * since the length of written data is determined by host, we cannot |
| 417 | * write onto the pcm buffer directly... the data is thus copied |
| 418 | * later at complete callback to the global buffer. |
| 419 | */ |
| 420 | static int prepare_capture_urb(struct snd_usb_substream *subs, |
| 421 | struct snd_pcm_runtime *runtime, |
| 422 | struct urb *urb) |
| 423 | { |
| 424 | int i, offs; |
| 425 | struct snd_urb_ctx *ctx = urb->context; |
| 426 | |
| 427 | offs = 0; |
| 428 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 429 | for (i = 0; i < ctx->packets; i++) { |
| 430 | urb->iso_frame_desc[i].offset = offs; |
| 431 | urb->iso_frame_desc[i].length = subs->curpacksize; |
| 432 | offs += subs->curpacksize; |
| 433 | } |
| 434 | urb->transfer_buffer_length = offs; |
| 435 | urb->number_of_packets = ctx->packets; |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * process after capture complete |
| 441 | * |
| 442 | * copy the data from each desctiptor to the pcm buffer, and |
| 443 | * update the current position. |
| 444 | */ |
| 445 | static int retire_capture_urb(struct snd_usb_substream *subs, |
| 446 | struct snd_pcm_runtime *runtime, |
| 447 | struct urb *urb) |
| 448 | { |
| 449 | unsigned long flags; |
| 450 | unsigned char *cp; |
| 451 | int i; |
| 452 | unsigned int stride, frames, bytes, oldptr; |
| 453 | int period_elapsed = 0; |
| 454 | |
| 455 | stride = runtime->frame_bits >> 3; |
| 456 | |
| 457 | for (i = 0; i < urb->number_of_packets; i++) { |
| 458 | cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
| 459 | if (urb->iso_frame_desc[i].status) { |
| 460 | snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); |
| 461 | // continue; |
| 462 | } |
| 463 | bytes = urb->iso_frame_desc[i].actual_length; |
| 464 | frames = bytes / stride; |
| 465 | if (!subs->txfr_quirk) |
| 466 | bytes = frames * stride; |
| 467 | if (bytes % (runtime->sample_bits >> 3) != 0) { |
| 468 | #ifdef CONFIG_SND_DEBUG_VERBOSE |
| 469 | int oldbytes = bytes; |
| 470 | #endif |
| 471 | bytes = frames * stride; |
| 472 | snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", |
| 473 | oldbytes, bytes); |
| 474 | } |
| 475 | /* update the current pointer */ |
| 476 | spin_lock_irqsave(&subs->lock, flags); |
| 477 | oldptr = subs->hwptr_done; |
| 478 | subs->hwptr_done += bytes; |
| 479 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
| 480 | subs->hwptr_done -= runtime->buffer_size * stride; |
| 481 | frames = (bytes + (oldptr % stride)) / stride; |
| 482 | subs->transfer_done += frames; |
| 483 | if (subs->transfer_done >= runtime->period_size) { |
| 484 | subs->transfer_done -= runtime->period_size; |
| 485 | period_elapsed = 1; |
| 486 | } |
| 487 | spin_unlock_irqrestore(&subs->lock, flags); |
| 488 | /* copy a data chunk */ |
| 489 | if (oldptr + bytes > runtime->buffer_size * stride) { |
| 490 | unsigned int bytes1 = |
| 491 | runtime->buffer_size * stride - oldptr; |
| 492 | memcpy(runtime->dma_area + oldptr, cp, bytes1); |
| 493 | memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); |
| 494 | } else { |
| 495 | memcpy(runtime->dma_area + oldptr, cp, bytes); |
| 496 | } |
| 497 | } |
| 498 | if (period_elapsed) |
| 499 | snd_pcm_period_elapsed(subs->pcm_substream); |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Process after capture complete when paused. Nothing to do. |
| 505 | */ |
| 506 | static int retire_paused_capture_urb(struct snd_usb_substream *subs, |
| 507 | struct snd_pcm_runtime *runtime, |
| 508 | struct urb *urb) |
| 509 | { |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | |
| 514 | /* |
| 515 | * prepare urb for full speed playback sync pipe |
| 516 | * |
| 517 | * set up the offset and length to receive the current frequency. |
| 518 | */ |
| 519 | |
| 520 | static int prepare_playback_sync_urb(struct snd_usb_substream *subs, |
| 521 | struct snd_pcm_runtime *runtime, |
| 522 | struct urb *urb) |
| 523 | { |
| 524 | struct snd_urb_ctx *ctx = urb->context; |
| 525 | |
| 526 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 527 | urb->iso_frame_desc[0].length = 3; |
| 528 | urb->iso_frame_desc[0].offset = 0; |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * prepare urb for high speed playback sync pipe |
| 534 | * |
| 535 | * set up the offset and length to receive the current frequency. |
| 536 | */ |
| 537 | |
| 538 | static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs, |
| 539 | struct snd_pcm_runtime *runtime, |
| 540 | struct urb *urb) |
| 541 | { |
| 542 | struct snd_urb_ctx *ctx = urb->context; |
| 543 | |
| 544 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 545 | urb->iso_frame_desc[0].length = 4; |
| 546 | urb->iso_frame_desc[0].offset = 0; |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * process after full speed playback sync complete |
| 552 | * |
| 553 | * retrieve the current 10.14 frequency from pipe, and set it. |
| 554 | * the value is referred in prepare_playback_urb(). |
| 555 | */ |
| 556 | static int retire_playback_sync_urb(struct snd_usb_substream *subs, |
| 557 | struct snd_pcm_runtime *runtime, |
| 558 | struct urb *urb) |
| 559 | { |
| 560 | unsigned int f; |
| 561 | unsigned long flags; |
| 562 | |
| 563 | if (urb->iso_frame_desc[0].status == 0 && |
| 564 | urb->iso_frame_desc[0].actual_length == 3) { |
| 565 | f = combine_triple((u8*)urb->transfer_buffer) << 2; |
| 566 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { |
| 567 | spin_lock_irqsave(&subs->lock, flags); |
| 568 | subs->freqm = f; |
| 569 | spin_unlock_irqrestore(&subs->lock, flags); |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * process after high speed playback sync complete |
| 578 | * |
| 579 | * retrieve the current 12.13 frequency from pipe, and set it. |
| 580 | * the value is referred in prepare_playback_urb(). |
| 581 | */ |
| 582 | static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs, |
| 583 | struct snd_pcm_runtime *runtime, |
| 584 | struct urb *urb) |
| 585 | { |
| 586 | unsigned int f; |
| 587 | unsigned long flags; |
| 588 | |
| 589 | if (urb->iso_frame_desc[0].status == 0 && |
| 590 | urb->iso_frame_desc[0].actual_length == 4) { |
| 591 | f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; |
| 592 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { |
| 593 | spin_lock_irqsave(&subs->lock, flags); |
| 594 | subs->freqm = f; |
| 595 | spin_unlock_irqrestore(&subs->lock, flags); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | return 0; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * process after E-Mu 0202/0404/Tracker Pre high speed playback sync complete |
| 604 | * |
| 605 | * These devices return the number of samples per packet instead of the number |
| 606 | * of samples per microframe. |
| 607 | */ |
| 608 | static int retire_playback_sync_urb_hs_emu(struct snd_usb_substream *subs, |
| 609 | struct snd_pcm_runtime *runtime, |
| 610 | struct urb *urb) |
| 611 | { |
| 612 | unsigned int f; |
| 613 | unsigned long flags; |
| 614 | |
| 615 | if (urb->iso_frame_desc[0].status == 0 && |
| 616 | urb->iso_frame_desc[0].actual_length == 4) { |
| 617 | f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; |
| 618 | f >>= subs->datainterval; |
| 619 | if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { |
| 620 | spin_lock_irqsave(&subs->lock, flags); |
| 621 | subs->freqm = f; |
| 622 | spin_unlock_irqrestore(&subs->lock, flags); |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | /* determine the number of frames in the next packet */ |
| 630 | static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) |
| 631 | { |
| 632 | if (subs->fill_max) |
| 633 | return subs->maxframesize; |
| 634 | else { |
| 635 | subs->phase = (subs->phase & 0xffff) |
| 636 | + (subs->freqm << subs->datainterval); |
| 637 | return min(subs->phase >> 16, subs->maxframesize); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * Prepare urb for streaming before playback starts or when paused. |
| 643 | * |
| 644 | * We don't have any data, so we send silence. |
| 645 | */ |
| 646 | static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, |
| 647 | struct snd_pcm_runtime *runtime, |
| 648 | struct urb *urb) |
| 649 | { |
| 650 | unsigned int i, offs, counts; |
| 651 | struct snd_urb_ctx *ctx = urb->context; |
| 652 | int stride = runtime->frame_bits >> 3; |
| 653 | |
| 654 | offs = 0; |
| 655 | urb->dev = ctx->subs->dev; |
| 656 | for (i = 0; i < ctx->packets; ++i) { |
| 657 | counts = snd_usb_audio_next_packet_size(subs); |
| 658 | urb->iso_frame_desc[i].offset = offs * stride; |
| 659 | urb->iso_frame_desc[i].length = counts * stride; |
| 660 | offs += counts; |
| 661 | } |
| 662 | urb->number_of_packets = ctx->packets; |
| 663 | urb->transfer_buffer_length = offs * stride; |
| 664 | memset(urb->transfer_buffer, |
Clemens Ladisch | 015eb0b | 2010-03-04 19:46:15 +0100 | [diff] [blame^] | 665 | runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, |
Daniel Mack | e577999 | 2010-03-04 19:46:13 +0100 | [diff] [blame] | 666 | offs * stride); |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * prepare urb for playback data pipe |
| 672 | * |
| 673 | * Since a URB can handle only a single linear buffer, we must use double |
| 674 | * buffering when the data to be transferred overflows the buffer boundary. |
| 675 | * To avoid inconsistencies when updating hwptr_done, we use double buffering |
| 676 | * for all URBs. |
| 677 | */ |
| 678 | static int prepare_playback_urb(struct snd_usb_substream *subs, |
| 679 | struct snd_pcm_runtime *runtime, |
| 680 | struct urb *urb) |
| 681 | { |
| 682 | int i, stride; |
| 683 | unsigned int counts, frames, bytes; |
| 684 | unsigned long flags; |
| 685 | int period_elapsed = 0; |
| 686 | struct snd_urb_ctx *ctx = urb->context; |
| 687 | |
| 688 | stride = runtime->frame_bits >> 3; |
| 689 | |
| 690 | frames = 0; |
| 691 | urb->dev = ctx->subs->dev; /* we need to set this at each time */ |
| 692 | urb->number_of_packets = 0; |
| 693 | spin_lock_irqsave(&subs->lock, flags); |
| 694 | for (i = 0; i < ctx->packets; i++) { |
| 695 | counts = snd_usb_audio_next_packet_size(subs); |
| 696 | /* set up descriptor */ |
| 697 | urb->iso_frame_desc[i].offset = frames * stride; |
| 698 | urb->iso_frame_desc[i].length = counts * stride; |
| 699 | frames += counts; |
| 700 | urb->number_of_packets++; |
| 701 | subs->transfer_done += counts; |
| 702 | if (subs->transfer_done >= runtime->period_size) { |
| 703 | subs->transfer_done -= runtime->period_size; |
| 704 | period_elapsed = 1; |
| 705 | if (subs->fmt_type == UAC_FORMAT_TYPE_II) { |
| 706 | if (subs->transfer_done > 0) { |
| 707 | /* FIXME: fill-max mode is not |
| 708 | * supported yet */ |
| 709 | frames -= subs->transfer_done; |
| 710 | counts -= subs->transfer_done; |
| 711 | urb->iso_frame_desc[i].length = |
| 712 | counts * stride; |
| 713 | subs->transfer_done = 0; |
| 714 | } |
| 715 | i++; |
| 716 | if (i < ctx->packets) { |
| 717 | /* add a transfer delimiter */ |
| 718 | urb->iso_frame_desc[i].offset = |
| 719 | frames * stride; |
| 720 | urb->iso_frame_desc[i].length = 0; |
| 721 | urb->number_of_packets++; |
| 722 | } |
| 723 | break; |
| 724 | } |
| 725 | } |
| 726 | if (period_elapsed) /* finish at the period boundary */ |
| 727 | break; |
| 728 | } |
| 729 | bytes = frames * stride; |
| 730 | if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { |
| 731 | /* err, the transferred area goes over buffer boundary. */ |
| 732 | unsigned int bytes1 = |
| 733 | runtime->buffer_size * stride - subs->hwptr_done; |
| 734 | memcpy(urb->transfer_buffer, |
| 735 | runtime->dma_area + subs->hwptr_done, bytes1); |
| 736 | memcpy(urb->transfer_buffer + bytes1, |
| 737 | runtime->dma_area, bytes - bytes1); |
| 738 | } else { |
| 739 | memcpy(urb->transfer_buffer, |
| 740 | runtime->dma_area + subs->hwptr_done, bytes); |
| 741 | } |
| 742 | subs->hwptr_done += bytes; |
| 743 | if (subs->hwptr_done >= runtime->buffer_size * stride) |
| 744 | subs->hwptr_done -= runtime->buffer_size * stride; |
| 745 | runtime->delay += frames; |
| 746 | spin_unlock_irqrestore(&subs->lock, flags); |
| 747 | urb->transfer_buffer_length = bytes; |
| 748 | if (period_elapsed) |
| 749 | snd_pcm_period_elapsed(subs->pcm_substream); |
| 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * process after playback data complete |
| 755 | * - decrease the delay count again |
| 756 | */ |
| 757 | static int retire_playback_urb(struct snd_usb_substream *subs, |
| 758 | struct snd_pcm_runtime *runtime, |
| 759 | struct urb *urb) |
| 760 | { |
| 761 | unsigned long flags; |
| 762 | int stride = runtime->frame_bits >> 3; |
| 763 | int processed = urb->transfer_buffer_length / stride; |
| 764 | |
| 765 | spin_lock_irqsave(&subs->lock, flags); |
| 766 | if (processed > runtime->delay) |
| 767 | runtime->delay = 0; |
| 768 | else |
| 769 | runtime->delay -= processed; |
| 770 | spin_unlock_irqrestore(&subs->lock, flags); |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | static const char *usb_error_string(int err) |
| 775 | { |
| 776 | switch (err) { |
| 777 | case -ENODEV: |
| 778 | return "no device"; |
| 779 | case -ENOENT: |
| 780 | return "endpoint not enabled"; |
| 781 | case -EPIPE: |
| 782 | return "endpoint stalled"; |
| 783 | case -ENOSPC: |
| 784 | return "not enough bandwidth"; |
| 785 | case -ESHUTDOWN: |
| 786 | return "device disabled"; |
| 787 | case -EHOSTUNREACH: |
| 788 | return "device suspended"; |
| 789 | case -EINVAL: |
| 790 | case -EAGAIN: |
| 791 | case -EFBIG: |
| 792 | case -EMSGSIZE: |
| 793 | return "internal error"; |
| 794 | default: |
| 795 | return "unknown error"; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * set up and start data/sync urbs |
| 801 | */ |
| 802 | static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) |
| 803 | { |
| 804 | unsigned int i; |
| 805 | int err; |
| 806 | |
| 807 | if (subs->stream->chip->shutdown) |
| 808 | return -EBADFD; |
| 809 | |
| 810 | for (i = 0; i < subs->nurbs; i++) { |
| 811 | if (snd_BUG_ON(!subs->dataurb[i].urb)) |
| 812 | return -EINVAL; |
| 813 | if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { |
| 814 | snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); |
| 815 | goto __error; |
| 816 | } |
| 817 | } |
| 818 | if (subs->syncpipe) { |
| 819 | for (i = 0; i < SYNC_URBS; i++) { |
| 820 | if (snd_BUG_ON(!subs->syncurb[i].urb)) |
| 821 | return -EINVAL; |
| 822 | if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { |
| 823 | snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); |
| 824 | goto __error; |
| 825 | } |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | subs->active_mask = 0; |
| 830 | subs->unlink_mask = 0; |
| 831 | subs->running = 1; |
| 832 | for (i = 0; i < subs->nurbs; i++) { |
| 833 | err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); |
| 834 | if (err < 0) { |
| 835 | snd_printk(KERN_ERR "cannot submit datapipe " |
| 836 | "for urb %d, error %d: %s\n", |
| 837 | i, err, usb_error_string(err)); |
| 838 | goto __error; |
| 839 | } |
| 840 | set_bit(i, &subs->active_mask); |
| 841 | } |
| 842 | if (subs->syncpipe) { |
| 843 | for (i = 0; i < SYNC_URBS; i++) { |
| 844 | err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); |
| 845 | if (err < 0) { |
| 846 | snd_printk(KERN_ERR "cannot submit syncpipe " |
| 847 | "for urb %d, error %d: %s\n", |
| 848 | i, err, usb_error_string(err)); |
| 849 | goto __error; |
| 850 | } |
| 851 | set_bit(i + 16, &subs->active_mask); |
| 852 | } |
| 853 | } |
| 854 | return 0; |
| 855 | |
| 856 | __error: |
| 857 | // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); |
| 858 | deactivate_urbs(subs, 0, 0); |
| 859 | return -EPIPE; |
| 860 | } |
| 861 | |
| 862 | |
| 863 | /* |
| 864 | */ |
| 865 | static struct snd_urb_ops audio_urb_ops[2] = { |
| 866 | { |
| 867 | .prepare = prepare_nodata_playback_urb, |
| 868 | .retire = retire_playback_urb, |
| 869 | .prepare_sync = prepare_playback_sync_urb, |
| 870 | .retire_sync = retire_playback_sync_urb, |
| 871 | }, |
| 872 | { |
| 873 | .prepare = prepare_capture_urb, |
| 874 | .retire = retire_capture_urb, |
| 875 | .prepare_sync = prepare_capture_sync_urb, |
| 876 | .retire_sync = retire_capture_sync_urb, |
| 877 | }, |
| 878 | }; |
| 879 | |
| 880 | static struct snd_urb_ops audio_urb_ops_high_speed[2] = { |
| 881 | { |
| 882 | .prepare = prepare_nodata_playback_urb, |
| 883 | .retire = retire_playback_urb, |
| 884 | .prepare_sync = prepare_playback_sync_urb_hs, |
| 885 | .retire_sync = retire_playback_sync_urb_hs, |
| 886 | }, |
| 887 | { |
| 888 | .prepare = prepare_capture_urb, |
| 889 | .retire = retire_capture_urb, |
| 890 | .prepare_sync = prepare_capture_sync_urb_hs, |
| 891 | .retire_sync = retire_capture_sync_urb, |
| 892 | }, |
| 893 | }; |
| 894 | |
| 895 | /* |
| 896 | * initialize the substream instance. |
| 897 | */ |
| 898 | |
| 899 | void snd_usb_init_substream(struct snd_usb_stream *as, |
| 900 | int stream, struct audioformat *fp) |
| 901 | { |
| 902 | struct snd_usb_substream *subs = &as->substream[stream]; |
| 903 | |
| 904 | INIT_LIST_HEAD(&subs->fmt_list); |
| 905 | spin_lock_init(&subs->lock); |
| 906 | |
| 907 | subs->stream = as; |
| 908 | subs->direction = stream; |
| 909 | subs->dev = as->chip->dev; |
| 910 | subs->txfr_quirk = as->chip->txfr_quirk; |
| 911 | if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) { |
| 912 | subs->ops = audio_urb_ops[stream]; |
| 913 | } else { |
| 914 | subs->ops = audio_urb_ops_high_speed[stream]; |
| 915 | switch (as->chip->usb_id) { |
| 916 | case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */ |
| 917 | case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */ |
| 918 | case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */ |
| 919 | subs->ops.retire_sync = retire_playback_sync_urb_hs_emu; |
| 920 | break; |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | snd_usb_set_pcm_ops(as->pcm, stream); |
| 925 | |
| 926 | list_add_tail(&fp->list, &subs->fmt_list); |
Clemens Ladisch | 015eb0b | 2010-03-04 19:46:15 +0100 | [diff] [blame^] | 927 | subs->formats |= fp->formats; |
Daniel Mack | e577999 | 2010-03-04 19:46:13 +0100 | [diff] [blame] | 928 | subs->endpoint = fp->endpoint; |
| 929 | subs->num_formats++; |
| 930 | subs->fmt_type = fp->fmt_type; |
| 931 | } |
| 932 | |
| 933 | int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) |
| 934 | { |
| 935 | struct snd_usb_substream *subs = substream->runtime->private_data; |
| 936 | |
| 937 | switch (cmd) { |
| 938 | case SNDRV_PCM_TRIGGER_START: |
| 939 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 940 | subs->ops.prepare = prepare_playback_urb; |
| 941 | return 0; |
| 942 | case SNDRV_PCM_TRIGGER_STOP: |
| 943 | return deactivate_urbs(subs, 0, 0); |
| 944 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 945 | subs->ops.prepare = prepare_nodata_playback_urb; |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | return -EINVAL; |
| 950 | } |
| 951 | |
| 952 | int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) |
| 953 | { |
| 954 | struct snd_usb_substream *subs = substream->runtime->private_data; |
| 955 | |
| 956 | switch (cmd) { |
| 957 | case SNDRV_PCM_TRIGGER_START: |
| 958 | subs->ops.retire = retire_capture_urb; |
| 959 | return start_urbs(subs, substream->runtime); |
| 960 | case SNDRV_PCM_TRIGGER_STOP: |
| 961 | return deactivate_urbs(subs, 0, 0); |
| 962 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 963 | subs->ops.retire = retire_paused_capture_urb; |
| 964 | return 0; |
| 965 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 966 | subs->ops.retire = retire_capture_urb; |
| 967 | return 0; |
| 968 | } |
| 969 | |
| 970 | return -EINVAL; |
| 971 | } |
| 972 | |
| 973 | int snd_usb_substream_prepare(struct snd_usb_substream *subs, |
| 974 | struct snd_pcm_runtime *runtime) |
| 975 | { |
| 976 | /* clear urbs (to be sure) */ |
| 977 | deactivate_urbs(subs, 0, 1); |
| 978 | wait_clear_urbs(subs); |
| 979 | |
| 980 | /* for playback, submit the URBs now; otherwise, the first hwptr_done |
| 981 | * updates for all URBs would happen at the same time when starting */ |
| 982 | if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { |
| 983 | subs->ops.prepare = prepare_nodata_playback_urb; |
| 984 | return start_urbs(subs, runtime); |
| 985 | } |
| 986 | |
| 987 | return 0; |
| 988 | } |
| 989 | |