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