drivers/staging/line6/playback.c

   1 /*
   2  * Line6 Linux USB driver - 0.8.0
   3  *
   4  * Copyright (C) 2004-2009 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 "driver.h"
  13
  14 #include <sound/core.h>
  15 #include <sound/pcm.h>
  16 #include <sound/pcm_params.h>
  17
  18 #include "audio.h"
  19 #include "pcm.h"
  20 #include "pod.h"
  21 #include "playback.h"
  22
  23 /*
  24         Software stereo volume control.
  25 */
  26 static void change_volume(struct urb *urb_out, int volume[],
  27                           int bytes_per_frame)
  28 {
  29         int chn = 0;
  30
  31         if (volume[0] == 256 && volume[1] == 256)
  32                 return;         /* maximum volume - no change */
  33
  34         if (bytes_per_frame == 4) {
  35                 short *p, *buf_end;
  36                 p = (short *)urb_out->transfer_buffer;
  37                 buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
  38
  39                 for (; p < buf_end; ++p) {
  40                         *p = (*p * volume[chn & 1]) >> 8;
  41                         ++chn;
  42                 }
  43         } else if (bytes_per_frame == 6) {
  44                 unsigned char *p, *buf_end;
  45                 p = (unsigned char *)urb_out->transfer_buffer;
  46                 buf_end = p + urb_out->transfer_buffer_length;
  47
  48                 for (; p < buf_end; p += 3) {
  49                         int val;
  50                         val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
  51                         val = (val * volume[chn & 1]) >> 8;
  52                         p[0] = val;
  53                         p[1] = val >> 8;
  54                         p[2] = val >> 16;
  55                         ++chn;
  56                 }
  57         }
  58 }
  59
  60 /*
  61         Find a free URB, prepare audio data, and submit URB.
  62 */
  63 static int submit_audio_out_urb(struct snd_pcm_substream *substream)
  64 {
  65         int index;
  66         unsigned long flags;
  67         int i, urb_size, urb_frames;
  68         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
  69         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
  70         const int frame_increment =
  71             line6pcm->properties->snd_line6_rates.rats[0].num_min;
  72         const int frame_factor =
  73             line6pcm->properties->snd_line6_rates.rats[0].den *
  74             (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
  75         struct snd_pcm_runtime *runtime = substream->runtime;
  76         struct urb *urb_out;
  77
  78         spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
  79         index =
  80             find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
  81
  82         if (index < 0 || index >= LINE6_ISO_BUFFERS) {
  83                 spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
  84                 dev_err(s2m(substream), "no free URB found\n");
  85                 return -EINVAL;
  86         }
  87
  88         urb_out = line6pcm->urb_audio_out[index];
  89         urb_size = 0;
  90
  91         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
  92                 /* compute frame size for given sampling rate */
  93                 int n, fs;
  94                 struct usb_iso_packet_descriptor *fout =
  95                     &urb_out->iso_frame_desc[i];
  96                 line6pcm->count_out += frame_increment;
  97                 n = line6pcm->count_out / frame_factor;
  98                 line6pcm->count_out -= n * frame_factor;
  99                 fs = n * bytes_per_frame;
 100                 fout->offset = urb_size;
 101                 fout->length = fs;
 102                 urb_size += fs;
 103         }
 104
 105         urb_frames = urb_size / bytes_per_frame;
 106
 107         if (test_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags)) {
 108                 urb_out->transfer_buffer = line6pcm->wrap_out;
 109                 memset(line6pcm->wrap_out, 0, urb_size);
 110         } else {
 111                 if (line6pcm->pos_out + urb_frames > runtime->buffer_size) {
 112                         /*
 113                            The transferred area goes over buffer boundary,
 114                            copy the data to the temp buffer.
 115                          */
 116                         int len;
 117                         len = runtime->buffer_size - line6pcm->pos_out;
 118                         urb_out->transfer_buffer = line6pcm->wrap_out;
 119
 120                         if (len > 0) {
 121                                 memcpy(line6pcm->wrap_out,
 122                                        runtime->dma_area +
 123                                        line6pcm->pos_out * bytes_per_frame,
 124                                        len * bytes_per_frame);
 125                                 memcpy(line6pcm->wrap_out +
 126                                        len * bytes_per_frame, runtime->dma_area,
 127                                        (urb_frames - len) * bytes_per_frame);
 128                         } else {
 129                                 /* this is somewhat paranoid */
 130                                 dev_err(s2m(substream),
 131                                         "driver bug: len = %d\n", len);
 132                         }
 133                 } else {
 134                         /* set the buffer pointer */
 135                         urb_out->transfer_buffer =
 136                             runtime->dma_area +
 137                             line6pcm->pos_out * bytes_per_frame;
 138                 }
 139         }
 140
 141         line6pcm->pos_out += urb_frames;
 142         if (line6pcm->pos_out >= runtime->buffer_size)
 143                 line6pcm->pos_out -= runtime->buffer_size;
 144
 145         urb_out->transfer_buffer_length = urb_size;
 146         urb_out->context = substream;
 147         change_volume(urb_out, line6pcm->volume, bytes_per_frame);
 148
 149 #if DO_DUMP_PCM_SEND
 150         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 151                 struct usb_iso_packet_descriptor *fout =
 152                     &urb_out->iso_frame_desc[i];
 153                 line6_write_hexdump(line6pcm->line6, 'P',
 154                                     urb_out->transfer_buffer + fout->offset,
 155                                     fout->length);
 156         }
 157 #endif
 158
 159         if (usb_submit_urb(urb_out, GFP_ATOMIC) == 0)
 160                 set_bit(index, &line6pcm->active_urb_out);
 161         else
 162                 dev_err(s2m(substream), "URB out #%d submission failed\n",
 163                         index);
 164
 165         spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 166         return 0;
 167 }
 168
 169 /*
 170         Submit all currently available playback URBs.
 171 */
 172 static int submit_audio_out_all_urbs(struct snd_pcm_substream *substream)
 173 {
 174         int ret, i;
 175
 176         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 177                 ret = submit_audio_out_urb(substream);
 178                 if (ret < 0)
 179                         return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 /*
 186         Unlink all currently active playback URBs.
 187 */
 188 static void unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 189 {
 190         unsigned int i;
 191
 192         for (i = LINE6_ISO_BUFFERS; i--;) {
 193                 if (test_bit(i, &line6pcm->active_urb_out)) {
 194                         if (!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
 195                                 struct urb *u = line6pcm->urb_audio_out[i];
 196                                 usb_unlink_urb(u);
 197                         }
 198                 }
 199         }
 200 }
 201
 202 /*
 203    Wait until unlinking of all currently active playback URBs has been finished.
 204 */
 205 static void wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 206 {
 207         int timeout = HZ;
 208         unsigned int i;
 209         int alive;
 210
 211         do {
 212                 alive = 0;
 213                 for (i = LINE6_ISO_BUFFERS; i--;) {
 214                         if (test_bit(i, &line6pcm->active_urb_out))
 215                                 alive++;
 216                 }
 217                 if (!alive)
 218                         break;
 219                 set_current_state(TASK_UNINTERRUPTIBLE);
 220                 schedule_timeout(1);
 221         } while (--timeout > 0);
 222         if (alive)
 223                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 224
 225         line6pcm->active_urb_out = 0;
 226         line6pcm->unlink_urb_out = 0;
 227 }
 228
 229 /*
 230         Unlink all currently active playback URBs, and wait for finishing.
 231 */
 232 void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 233 {
 234         unlink_audio_out_urbs(line6pcm);
 235         wait_clear_audio_out_urbs(line6pcm);
 236 }
 237
 238 /*
 239         Callback for completed playback URB.
 240 */
 241 static void audio_out_callback(struct urb *urb)
 242 {
 243         int i, index, length = 0, shutdown = 0;
 244         unsigned long flags;
 245
 246         struct snd_pcm_substream *substream =
 247             (struct snd_pcm_substream *)urb->context;
 248         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 249         struct snd_pcm_runtime *runtime = substream->runtime;
 250
 251         /* find index of URB */
 252         for (index = LINE6_ISO_BUFFERS; index--;)
 253                 if (urb == line6pcm->urb_audio_out[index])
 254                         break;
 255
 256         if (index < 0)
 257                 return;         /* URB has been unlinked asynchronously */
 258
 259         for (i = LINE6_ISO_PACKETS; i--;)
 260                 length += urb->iso_frame_desc[i].length;
 261
 262         spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
 263         line6pcm->pos_out_done +=
 264             length / line6pcm->properties->bytes_per_frame;
 265
 266         if (line6pcm->pos_out_done >= runtime->buffer_size)
 267                 line6pcm->pos_out_done -= runtime->buffer_size;
 268
 269         clear_bit(index, &line6pcm->active_urb_out);
 270
 271         for (i = LINE6_ISO_PACKETS; i--;)
 272                 if (urb->iso_frame_desc[i].status == -ESHUTDOWN) {
 273                         shutdown = 1;
 274                         break;
 275                 }
 276
 277         if (test_bit(index, &line6pcm->unlink_urb_out))
 278                 shutdown = 1;
 279
 280         spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
 281
 282         if (!shutdown) {
 283                 submit_audio_out_urb(substream);
 284
 285                 line6pcm->bytes_out += length;
 286                 if (line6pcm->bytes_out >= line6pcm->period_out) {
 287                         line6pcm->bytes_out -= line6pcm->period_out;
 288                         snd_pcm_period_elapsed(substream);
 289                 }
 290         }
 291 }
 292
 293 /* open playback callback */
 294 static int snd_line6_playback_open(struct snd_pcm_substream *substream)
 295 {
 296         int err;
 297         struct snd_pcm_runtime *runtime = substream->runtime;
 298         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 299
 300         err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 301                                             (&line6pcm->properties->
 302                                              snd_line6_rates));
 303         if (err < 0)
 304                 return err;
 305
 306         runtime->hw = line6pcm->properties->snd_line6_playback_hw;
 307         return 0;
 308 }
 309
 310 /* close playback callback */
 311 static int snd_line6_playback_close(struct snd_pcm_substream *substream)
 312 {
 313         return 0;
 314 }
 315
 316 /* hw_params playback callback */
 317 static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream,
 318                                         struct snd_pcm_hw_params *hw_params)
 319 {
 320         int ret;
 321         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 322
 323         /* -- Florian Demski [FD] */
 324         /* don't ask me why, but this fixes the bug on my machine */
 325         if (line6pcm == NULL) {
 326                 if (substream->pcm == NULL)
 327                         return -ENOMEM;
 328                 if (substream->pcm->private_data == NULL)
 329                         return -ENOMEM;
 330                 substream->private_data = substream->pcm->private_data;
 331                 line6pcm = snd_pcm_substream_chip(substream);
 332         }
 333         /* -- [FD] end */
 334
 335         ret = snd_pcm_lib_malloc_pages(substream,
 336                                        params_buffer_bytes(hw_params));
 337         if (ret < 0)
 338                 return ret;
 339
 340         line6pcm->period_out = params_period_bytes(hw_params);
 341         line6pcm->wrap_out = kmalloc(2 * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
 342
 343         if (!line6pcm->wrap_out) {
 344                 dev_err(s2m(substream), "cannot malloc wrap_out\n");
 345                 return -ENOMEM;
 346         }
 347
 348         return 0;
 349 }
 350
 351 /* hw_free playback callback */
 352 static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
 353 {
 354         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 355         unlink_wait_clear_audio_out_urbs(line6pcm);
 356
 357         kfree(line6pcm->wrap_out);
 358         line6pcm->wrap_out = NULL;
 359
 360         return snd_pcm_lib_free_pages(substream);
 361 }
 362
 363 /* trigger playback callback */
 364 int snd_line6_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 365 {
 366         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 367         int err;
 368         line6pcm->count_out = 0;
 369
 370         switch (cmd) {
 371         case SNDRV_PCM_TRIGGER_START:
 372                 if (!test_and_set_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags)) {
 373                         err = submit_audio_out_all_urbs(substream);
 374
 375                         if (err < 0) {
 376                                 clear_bit(BIT_RUNNING_PLAYBACK,
 377                                           &line6pcm->flags);
 378                                 return err;
 379                         }
 380                 }
 381
 382                 break;
 383
 384         case SNDRV_PCM_TRIGGER_STOP:
 385                 if (test_and_clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags))
 386                         unlink_audio_out_urbs(line6pcm);
 387
 388                 break;
 389
 390         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 391                 set_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
 392                 break;
 393
 394         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 395                 clear_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
 396                 break;
 397
 398         default:
 399                 return -EINVAL;
 400         }
 401
 402         return 0;
 403 }
 404
 405 /* playback pointer callback */
 406 static snd_pcm_uframes_t
 407 snd_line6_playback_pointer(struct snd_pcm_substream *substream)
 408 {
 409         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 410         return line6pcm->pos_out_done;
 411 }
 412
 413 /* playback operators */
 414 struct snd_pcm_ops snd_line6_playback_ops = {
 415         .open = snd_line6_playback_open,
 416         .close = snd_line6_playback_close,
 417         .ioctl = snd_pcm_lib_ioctl,
 418         .hw_params = snd_line6_playback_hw_params,
 419         .hw_free = snd_line6_playback_hw_free,
 420         .prepare = snd_line6_prepare,
 421         .trigger = snd_line6_trigger,
 422         .pointer = snd_line6_playback_pointer,
 423 };
 424
 425 int create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
 426 {
 427         int i;
 428
 429         /* create audio URBs and fill in constant values: */
 430         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 431                 struct urb *urb;
 432
 433                 /* URB for audio out: */
 434                 urb = line6pcm->urb_audio_out[i] =
 435                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 436
 437                 if (urb == NULL) {
 438                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 439                         return -ENOMEM;
 440                 }
 441
 442                 urb->dev = line6pcm->line6->usbdev;
 443                 urb->pipe =
 444                     usb_sndisocpipe(line6pcm->line6->usbdev,
 445                                     line6pcm->
 446                                     ep_audio_write & USB_ENDPOINT_NUMBER_MASK);
 447                 urb->transfer_flags = URB_ISO_ASAP;
 448                 urb->start_frame = -1;
 449                 urb->number_of_packets = LINE6_ISO_PACKETS;
 450                 urb->interval = LINE6_ISO_INTERVAL;
 451                 urb->error_count = 0;
 452                 urb->complete = audio_out_callback;
 453         }
 454
 455         return 0;
 456 }