drivers/staging/line6/capture.c

   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
  23 /*
  24         Find a free URB and submit it.
  25 */
  26 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
  27 {
  28         int index;
  29         unsigned long flags;
  30         int i, urb_size;
  31         int ret;
  32         struct urb *urb_in;
  33
  34         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
  35         index =
  36             find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
  37
  38         if (index < 0 || index >= LINE6_ISO_BUFFERS) {
  39                 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  40                 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
  41                 return -EINVAL;
  42         }
  43
  44         urb_in = line6pcm->urb_audio_in[index];
  45         urb_size = 0;
  46
  47         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
  48                 struct usb_iso_packet_descriptor *fin =
  49                     &urb_in->iso_frame_desc[i];
  50                 fin->offset = urb_size;
  51                 fin->length = line6pcm->max_packet_size;
  52                 urb_size += line6pcm->max_packet_size;
  53         }
  54
  55         urb_in->transfer_buffer =
  56             line6pcm->buffer_in +
  57             index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
  58         urb_in->transfer_buffer_length = urb_size;
  59         urb_in->context = line6pcm;
  60
  61         ret = usb_submit_urb(urb_in, GFP_ATOMIC);
  62
  63         if (ret == 0)
  64                 set_bit(index, &line6pcm->active_urb_in);
  65         else
  66                 dev_err(line6pcm->line6->ifcdev,
  67                         "URB in #%d submission failed (%d)\n", index, ret);
  68
  69         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  70         return 0;
  71 }
  72
  73 /*
  74         Submit all currently available capture URBs.
  75 */
  76 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
  77 {
  78         int ret, i;
  79
  80         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
  81                 ret = submit_audio_in_urb(line6pcm);
  82                 if (ret < 0)
  83                         return ret;
  84         }
  85
  86         return 0;
  87 }
  88
  89 /*
  90         Unlink all currently active capture URBs.
  91 */
  92 void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  93 {
  94         unsigned int i;
  95
  96         for (i = LINE6_ISO_BUFFERS; i--;) {
  97                 if (test_bit(i, &line6pcm->active_urb_in)) {
  98                         if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
  99                                 struct urb *u = line6pcm->urb_audio_in[i];
 100
 101                                 usb_unlink_urb(u);
 102                         }
 103                 }
 104         }
 105 }
 106
 107 /*
 108         Wait until unlinking of all currently active capture URBs has been
 109         finished.
 110 */
 111 void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 112 {
 113         int timeout = HZ;
 114         unsigned int i;
 115         int alive;
 116
 117         do {
 118                 alive = 0;
 119                 for (i = LINE6_ISO_BUFFERS; i--;) {
 120                         if (test_bit(i, &line6pcm->active_urb_in))
 121                                 alive++;
 122                 }
 123                 if (!alive)
 124                         break;
 125                 set_current_state(TASK_UNINTERRUPTIBLE);
 126                 schedule_timeout(1);
 127         } while (--timeout > 0);
 128         if (alive)
 129                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 130 }
 131
 132 /*
 133         Unlink all currently active capture URBs, and wait for finishing.
 134 */
 135 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 136 {
 137         line6_unlink_audio_in_urbs(line6pcm);
 138         line6_wait_clear_audio_in_urbs(line6pcm);
 139 }
 140
 141 /*
 142         Copy data into ALSA capture buffer.
 143 */
 144 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
 145 {
 146         struct snd_pcm_substream *substream =
 147             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 148         struct snd_pcm_runtime *runtime = substream->runtime;
 149         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 150         int frames = fsize / bytes_per_frame;
 151
 152         if (runtime == NULL)
 153                 return;
 154
 155         if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
 156                 /*
 157                    The transferred area goes over buffer boundary,
 158                    copy two separate chunks.
 159                  */
 160                 int len;
 161
 162                 len = runtime->buffer_size - line6pcm->pos_in_done;
 163
 164                 if (len > 0) {
 165                         memcpy(runtime->dma_area +
 166                                line6pcm->pos_in_done * bytes_per_frame, fbuf,
 167                                len * bytes_per_frame);
 168                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
 169                                (frames - len) * bytes_per_frame);
 170                 } else {
 171                         /* this is somewhat paranoid */
 172                         dev_err(line6pcm->line6->ifcdev,
 173                                 "driver bug: len = %d\n", len);
 174                 }
 175         } else {
 176                 /* copy single chunk */
 177                 memcpy(runtime->dma_area +
 178                        line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
 179         }
 180
 181         line6pcm->pos_in_done += frames;
 182         if (line6pcm->pos_in_done >= runtime->buffer_size)
 183                 line6pcm->pos_in_done -= runtime->buffer_size;
 184 }
 185
 186 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
 187 {
 188         struct snd_pcm_substream *substream =
 189             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 190
 191         line6pcm->bytes_in += length;
 192         if (line6pcm->bytes_in >= line6pcm->period_in) {
 193                 line6pcm->bytes_in %= line6pcm->period_in;
 194                 snd_pcm_period_elapsed(substream);
 195         }
 196 }
 197
 198 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
 199 {
 200         kfree(line6pcm->buffer_in);
 201         line6pcm->buffer_in = NULL;
 202 }
 203
 204 /*
 205  * Callback for completed capture URB.
 206  */
 207 static void audio_in_callback(struct urb *urb)
 208 {
 209         int i, index, length = 0, shutdown = 0;
 210         unsigned long flags;
 211
 212         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 213
 214         line6pcm->last_frame_in = urb->start_frame;
 215
 216         /* find index of URB */
 217         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 218                 if (urb == line6pcm->urb_audio_in[index])
 219                         break;
 220
 221         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 222
 223         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 224                 char *fbuf;
 225                 int fsize;
 226                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 227
 228                 if (fin->status == -EXDEV) {
 229                         shutdown = 1;
 230                         break;
 231                 }
 232
 233                 fbuf = urb->transfer_buffer + fin->offset;
 234                 fsize = fin->actual_length;
 235
 236                 if (fsize > line6pcm->max_packet_size) {
 237                         dev_err(line6pcm->line6->ifcdev,
 238                                 "driver and/or device bug: packet too large (%d > %d)\n",
 239                                 fsize, line6pcm->max_packet_size);
 240                 }
 241
 242                 length += fsize;
 243
 244                 /* the following assumes LINE6_ISO_PACKETS == 1: */
 245                 line6pcm->prev_fbuf = fbuf;
 246                 line6pcm->prev_fsize = fsize;
 247
 248 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 249                 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 250 #endif
 251                         if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 252                                      &line6pcm->flags) && (fsize > 0))
 253                                 line6_capture_copy(line6pcm, fbuf, fsize);
 254         }
 255
 256         clear_bit(index, &line6pcm->active_urb_in);
 257
 258         if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
 259                 shutdown = 1;
 260
 261         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 262
 263         if (!shutdown) {
 264                 submit_audio_in_urb(line6pcm);
 265
 266 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 267                 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
 268 #endif
 269                         if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
 270                                      &line6pcm->flags))
 271                                 line6_capture_check_period(line6pcm, length);
 272         }
 273 }
 274
 275 /* open capture callback */
 276 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 277 {
 278         int err;
 279         struct snd_pcm_runtime *runtime = substream->runtime;
 280         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 281
 282         err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 283                                             SNDRV_PCM_HW_PARAM_RATE,
 284                                             (&line6pcm->
 285                                              properties->snd_line6_rates));
 286         if (err < 0)
 287                 return err;
 288
 289         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 290         return 0;
 291 }
 292
 293 /* close capture callback */
 294 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 295 {
 296         return 0;
 297 }
 298
 299 /* hw_params capture callback */
 300 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 301                                        struct snd_pcm_hw_params *hw_params)
 302 {
 303         int ret;
 304         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 305
 306         /* -- Florian Demski [FD] */
 307         /* don't ask me why, but this fixes the bug on my machine */
 308         if (line6pcm == NULL) {
 309                 if (substream->pcm == NULL)
 310                         return -ENOMEM;
 311                 if (substream->pcm->private_data == NULL)
 312                         return -ENOMEM;
 313                 substream->private_data = substream->pcm->private_data;
 314                 line6pcm = snd_pcm_substream_chip(substream);
 315         }
 316         /* -- [FD] end */
 317
 318         ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 319
 320         if (ret < 0)
 321                 return ret;
 322
 323         ret = snd_pcm_lib_malloc_pages(substream,
 324                                        params_buffer_bytes(hw_params));
 325         if (ret < 0) {
 326                 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 327                 return ret;
 328         }
 329
 330         line6pcm->period_in = params_period_bytes(hw_params);
 331         return 0;
 332 }
 333
 334 /* hw_free capture callback */
 335 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 336 {
 337         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 338
 339         line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
 340         return snd_pcm_lib_free_pages(substream);
 341 }
 342
 343 /* trigger callback */
 344 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 345 {
 346         int err;
 347
 348         switch (cmd) {
 349         case SNDRV_PCM_TRIGGER_START:
 350 #ifdef CONFIG_PM
 351         case SNDRV_PCM_TRIGGER_RESUME:
 352 #endif
 353                 err = line6_pcm_acquire(line6pcm,
 354                                         LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 355
 356                 if (err < 0)
 357                         return err;
 358
 359                 break;
 360
 361         case SNDRV_PCM_TRIGGER_STOP:
 362 #ifdef CONFIG_PM
 363         case SNDRV_PCM_TRIGGER_SUSPEND:
 364 #endif
 365                 err = line6_pcm_release(line6pcm,
 366                                         LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
 367
 368                 if (err < 0)
 369                         return err;
 370
 371                 break;
 372
 373         default:
 374                 return -EINVAL;
 375         }
 376
 377         return 0;
 378 }
 379
 380 /* capture pointer callback */
 381 static snd_pcm_uframes_t
 382 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 383 {
 384         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 385
 386         return line6pcm->pos_in_done;
 387 }
 388
 389 /* capture operators */
 390 struct snd_pcm_ops snd_line6_capture_ops = {
 391         .open = snd_line6_capture_open,
 392         .close = snd_line6_capture_close,
 393         .ioctl = snd_pcm_lib_ioctl,
 394         .hw_params = snd_line6_capture_hw_params,
 395         .hw_free = snd_line6_capture_hw_free,
 396         .prepare = snd_line6_prepare,
 397         .trigger = snd_line6_trigger,
 398         .pointer = snd_line6_capture_pointer,
 399 };
 400
 401 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 402 {
 403         int i;
 404
 405         /* create audio URBs and fill in constant values: */
 406         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 407                 struct urb *urb;
 408
 409                 /* URB for audio in: */
 410                 urb = line6pcm->urb_audio_in[i] =
 411                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 412
 413                 if (urb == NULL) {
 414                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 415                         return -ENOMEM;
 416                 }
 417
 418                 urb->dev = line6pcm->line6->usbdev;
 419                 urb->pipe =
 420                     usb_rcvisocpipe(line6pcm->line6->usbdev,
 421                                     line6pcm->ep_audio_read &
 422                                     USB_ENDPOINT_NUMBER_MASK);
 423                 urb->transfer_flags = URB_ISO_ASAP;
 424                 urb->start_frame = -1;
 425                 urb->number_of_packets = LINE6_ISO_PACKETS;
 426                 urb->interval = LINE6_ISO_INTERVAL;
 427                 urb->error_count = 0;
 428                 urb->complete = audio_in_callback;
 429         }
 430
 431         return 0;
 432 }