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