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