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 static void 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         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 int line6_alloc_capture_buffer(struct snd_line6_pcm *line6pcm)
 197 {
 198         /* We may be invoked multiple times in a row so allocate once only */
 199         if (line6pcm->buffer_in)
 200                 return 0;
 201
 202         line6pcm->buffer_in =
 203                 kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
 204                         line6pcm->max_packet_size, GFP_KERNEL);
 205
 206         if (!line6pcm->buffer_in) {
 207                 dev_err(line6pcm->line6->ifcdev,
 208                         "cannot malloc capture buffer\n");
 209                 return -ENOMEM;
 210         }
 211
 212         return 0;
 213 }
 214
 215 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
 216 {
 217         kfree(line6pcm->buffer_in);
 218         line6pcm->buffer_in = NULL;
 219 }
 220
 221 /*
 222  * Callback for completed capture URB.
 223  */
 224 static void audio_in_callback(struct urb *urb)
 225 {
 226         int i, index, length = 0, shutdown = 0;
 227         unsigned long flags;
 228
 229         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 230
 231         line6pcm->last_frame_in = urb->start_frame;
 232
 233         /* find index of URB */
 234         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 235                 if (urb == line6pcm->urb_audio_in[index])
 236                         break;
 237
 238 #ifdef CONFIG_LINE6_USB_DUMP_PCM
 239         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 240                 struct usb_iso_packet_descriptor *fout =
 241                     &urb->iso_frame_desc[i];
 242                 line6_write_hexdump(line6pcm->line6, 'C',
 243                                     urb->transfer_buffer + fout->offset,
 244                                     fout->length);
 245         }
 246 #endif
 247
 248         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 249
 250         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 251                 char *fbuf;
 252                 int fsize;
 253                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 254
 255                 if (fin->status == -EXDEV) {
 256                         shutdown = 1;
 257                         break;
 258                 }
 259
 260                 fbuf = urb->transfer_buffer + fin->offset;
 261                 fsize = fin->actual_length;
 262
 263                 if (fsize > line6pcm->max_packet_size) {
 264                         dev_err(line6pcm->line6->ifcdev,
 265                                 "driver and/or device bug: packet too large (%d > %d)\n",
 266                                 fsize, line6pcm->max_packet_size);
 267                 }
 268
 269                 length += fsize;
 270
 271                 /* the following assumes LINE6_ISO_PACKETS == 1: */
 272                 line6pcm->prev_fbuf = fbuf;
 273                 line6pcm->prev_fsize = fsize;
 274
 275 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 276                 if (!(line6pcm->flags & MASK_PCM_IMPULSE))
 277 #endif
 278                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags)
 279                             && (fsize > 0))
 280                                 line6_capture_copy(line6pcm, fbuf, fsize);
 281         }
 282
 283         clear_bit(index, &line6pcm->active_urb_in);
 284
 285         if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
 286                 shutdown = 1;
 287
 288         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 289
 290         if (!shutdown) {
 291                 submit_audio_in_urb(line6pcm);
 292
 293 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 294                 if (!(line6pcm->flags & MASK_PCM_IMPULSE))
 295 #endif
 296                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags))
 297                                 line6_capture_check_period(line6pcm, length);
 298         }
 299 }
 300
 301 /* open capture callback */
 302 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 303 {
 304         int err;
 305         struct snd_pcm_runtime *runtime = substream->runtime;
 306         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 307
 308         err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 309                                             SNDRV_PCM_HW_PARAM_RATE,
 310                                             (&line6pcm->
 311                                              properties->snd_line6_rates));
 312         if (err < 0)
 313                 return err;
 314
 315         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 316         return 0;
 317 }
 318
 319 /* close capture callback */
 320 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 321 {
 322         return 0;
 323 }
 324
 325 /* hw_params capture callback */
 326 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 327                                        struct snd_pcm_hw_params *hw_params)
 328 {
 329         int ret;
 330         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 331
 332         /* -- Florian Demski [FD] */
 333         /* don't ask me why, but this fixes the bug on my machine */
 334         if (line6pcm == NULL) {
 335                 if (substream->pcm == NULL)
 336                         return -ENOMEM;
 337                 if (substream->pcm->private_data == NULL)
 338                         return -ENOMEM;
 339                 substream->private_data = substream->pcm->private_data;
 340                 line6pcm = snd_pcm_substream_chip(substream);
 341         }
 342         /* -- [FD] end */
 343
 344         if ((line6pcm->flags & MASK_CAPTURE) == 0) {
 345                 ret = line6_alloc_capture_buffer(line6pcm);
 346
 347                 if (ret < 0)
 348                         return ret;
 349         }
 350
 351         ret = snd_pcm_lib_malloc_pages(substream,
 352                                        params_buffer_bytes(hw_params));
 353         if (ret < 0)
 354                 return ret;
 355
 356         line6pcm->period_in = params_period_bytes(hw_params);
 357         return 0;
 358 }
 359
 360 /* hw_free capture callback */
 361 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 362 {
 363         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 364
 365         if ((line6pcm->flags & MASK_CAPTURE) == 0) {
 366                 line6_unlink_wait_clear_audio_in_urbs(line6pcm);
 367                 line6_free_capture_buffer(line6pcm);
 368         }
 369
 370         return snd_pcm_lib_free_pages(substream);
 371 }
 372
 373 /* trigger callback */
 374 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 375 {
 376         int err;
 377
 378         switch (cmd) {
 379         case SNDRV_PCM_TRIGGER_START:
 380 #ifdef CONFIG_PM
 381         case SNDRV_PCM_TRIGGER_RESUME:
 382 #endif
 383                 err = line6_pcm_start(line6pcm, MASK_PCM_ALSA_CAPTURE);
 384
 385                 if (err < 0)
 386                         return err;
 387
 388                 break;
 389
 390         case SNDRV_PCM_TRIGGER_STOP:
 391 #ifdef CONFIG_PM
 392         case SNDRV_PCM_TRIGGER_SUSPEND:
 393 #endif
 394                 err = line6_pcm_stop(line6pcm, MASK_PCM_ALSA_CAPTURE);
 395
 396                 if (err < 0)
 397                         return err;
 398
 399                 break;
 400
 401         default:
 402                 return -EINVAL;
 403         }
 404
 405         return 0;
 406 }
 407
 408 /* capture pointer callback */
 409 static snd_pcm_uframes_t
 410 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 411 {
 412         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 413         return line6pcm->pos_in_done;
 414 }
 415
 416 /* capture operators */
 417 struct snd_pcm_ops snd_line6_capture_ops = {
 418         .open = snd_line6_capture_open,
 419         .close = snd_line6_capture_close,
 420         .ioctl = snd_pcm_lib_ioctl,
 421         .hw_params = snd_line6_capture_hw_params,
 422         .hw_free = snd_line6_capture_hw_free,
 423         .prepare = snd_line6_prepare,
 424         .trigger = snd_line6_trigger,
 425         .pointer = snd_line6_capture_pointer,
 426 };
 427
 428 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 429 {
 430         int i;
 431
 432         /* create audio URBs and fill in constant values: */
 433         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 434                 struct urb *urb;
 435
 436                 /* URB for audio in: */
 437                 urb = line6pcm->urb_audio_in[i] =
 438                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 439
 440                 if (urb == NULL) {
 441                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 442                         return -ENOMEM;
 443                 }
 444
 445                 urb->dev = line6pcm->line6->usbdev;
 446                 urb->pipe =
 447                     usb_rcvisocpipe(line6pcm->line6->usbdev,
 448                                     line6pcm->ep_audio_read &
 449                                     USB_ENDPOINT_NUMBER_MASK);
 450                 urb->transfer_flags = URB_ISO_ASAP;
 451                 urb->start_frame = -1;
 452                 urb->number_of_packets = LINE6_ISO_PACKETS;
 453                 urb->interval = LINE6_ISO_INTERVAL;
 454                 urb->error_count = 0;
 455                 urb->complete = audio_in_callback;
 456         }
 457
 458         return 0;
 459 }