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 <sound/core.h>
  13 #include <sound/pcm.h>
  14 #include <sound/pcm_params.h>
  15
  16 #include "audio.h"
  17 #include "capture.h"
  18 #include "driver.h"
  19 #include "pcm.h"
  20 #include "pod.h"
  21
  22 /*
  23         Find a free URB and submit it.
  24 */
  25 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
  26 {
  27         int index;
  28         unsigned long flags;
  29         int i, urb_size;
  30         int ret;
  31         struct urb *urb_in;
  32
  33         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
  34         index =
  35             find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
  36
  37         if (index < 0 || index >= LINE6_ISO_BUFFERS) {
  38                 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  39                 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
  40                 return -EINVAL;
  41         }
  42
  43         urb_in = line6pcm->urb_audio_in[index];
  44         urb_size = 0;
  45
  46         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
  47                 struct usb_iso_packet_descriptor *fin =
  48                     &urb_in->iso_frame_desc[i];
  49                 fin->offset = urb_size;
  50                 fin->length = line6pcm->max_packet_size;
  51                 urb_size += line6pcm->max_packet_size;
  52         }
  53
  54         urb_in->transfer_buffer =
  55             line6pcm->buffer_in +
  56             index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
  57         urb_in->transfer_buffer_length = urb_size;
  58         urb_in->context = line6pcm;
  59
  60         ret = usb_submit_urb(urb_in, GFP_ATOMIC);
  61
  62         if (ret == 0)
  63                 set_bit(index, &line6pcm->active_urb_in);
  64         else
  65                 dev_err(line6pcm->line6->ifcdev,
  66                         "URB in #%d submission failed (%d)\n", index, ret);
  67
  68         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  69         return 0;
  70 }
  71
  72 /*
  73         Submit all currently available capture URBs.
  74 */
  75 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
  76 {
  77         int ret, i;
  78
  79         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
  80                 ret = submit_audio_in_urb(line6pcm);
  81                 if (ret < 0)
  82                         return ret;
  83         }
  84
  85         return 0;
  86 }
  87
  88 /*
  89         Unlink all currently active capture URBs.
  90 */
  91 void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  92 {
  93         unsigned int i;
  94
  95         for (i = LINE6_ISO_BUFFERS; i--;) {
  96                 if (test_bit(i, &line6pcm->active_urb_in)) {
  97                         if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
  98                                 struct urb *u = line6pcm->urb_audio_in[i];
  99                                 usb_unlink_urb(u);
 100                         }
 101                 }
 102         }
 103 }
 104
 105 /*
 106         Wait until unlinking of all currently active capture URBs has been
 107         finished.
 108 */
 109 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 110 {
 111         int timeout = HZ;
 112         unsigned int i;
 113         int alive;
 114
 115         do {
 116                 alive = 0;
 117                 for (i = LINE6_ISO_BUFFERS; i--;) {
 118                         if (test_bit(i, &line6pcm->active_urb_in))
 119                                 alive++;
 120                 }
 121                 if (!alive)
 122                         break;
 123                 set_current_state(TASK_UNINTERRUPTIBLE);
 124                 schedule_timeout(1);
 125         } while (--timeout > 0);
 126         if (alive)
 127                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 128 }
 129
 130 /*
 131         Unlink all currently active capture URBs, and wait for finishing.
 132 */
 133 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 134 {
 135         line6_unlink_audio_in_urbs(line6pcm);
 136         wait_clear_audio_in_urbs(line6pcm);
 137 }
 138
 139 /*
 140         Copy data into ALSA capture buffer.
 141 */
 142 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
 143 {
 144         struct snd_pcm_substream *substream =
 145             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 148         int frames = fsize / bytes_per_frame;
 149
 150         if (runtime == 0)
 151                 return;
 152
 153         if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
 154                 /*
 155                    The transferred area goes over buffer boundary,
 156                    copy two separate chunks.
 157                  */
 158                 int len;
 159                 len = runtime->buffer_size - line6pcm->pos_in_done;
 160
 161                 if (len > 0) {
 162                         memcpy(runtime->dma_area +
 163                                line6pcm->pos_in_done * bytes_per_frame, fbuf,
 164                                len * bytes_per_frame);
 165                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
 166                                (frames - len) * bytes_per_frame);
 167                 } else
 168                         dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", len);        /* this is somewhat paranoid */
 169         } else {
 170                 /* copy single chunk */
 171                 memcpy(runtime->dma_area +
 172                        line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
 173         }
 174
 175         if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
 176                 line6pcm->pos_in_done -= runtime->buffer_size;
 177 }
 178
 179 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
 180 {
 181         struct snd_pcm_substream *substream =
 182             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 183
 184         if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
 185                 line6pcm->bytes_in %= line6pcm->period_in;
 186                 snd_pcm_period_elapsed(substream);
 187         }
 188 }
 189
 190 /*
 191   Callback for completed capture URB.
 192 */
 193 static void audio_in_callback(struct urb *urb)
 194 {
 195         int i, index, length = 0, shutdown = 0;
 196         unsigned long flags;
 197
 198         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 199
 200         line6pcm->last_frame_in = urb->start_frame;
 201
 202         /* find index of URB */
 203         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 204                 if (urb == line6pcm->urb_audio_in[index])
 205                         break;
 206
 207 #ifdef CONFIG_LINE6_USB_DUMP_PCM
 208         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 209                 struct usb_iso_packet_descriptor *fout =
 210                     &urb->iso_frame_desc[i];
 211                 line6_write_hexdump(line6pcm->line6, 'C',
 212                                     urb->transfer_buffer + fout->offset,
 213                                     fout->length);
 214         }
 215 #endif
 216
 217         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 218
 219         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 220                 char *fbuf;
 221                 int fsize;
 222                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 223
 224                 if (fin->status == -EXDEV) {
 225                         shutdown = 1;
 226                         break;
 227                 }
 228
 229                 fbuf = urb->transfer_buffer + fin->offset;
 230                 fsize = fin->actual_length;
 231
 232                 if (fsize > line6pcm->max_packet_size) {
 233                         dev_err(line6pcm->line6->ifcdev,
 234                                 "driver and/or device bug: packet too large (%d > %d)\n",
 235                                 fsize, line6pcm->max_packet_size);
 236                 }
 237
 238                 length += fsize;
 239
 240                 /* the following assumes LINE6_ISO_PACKETS == 1: */
 241 #if LINE6_BACKUP_MONITOR_SIGNAL
 242                 memcpy(line6pcm->prev_fbuf, fbuf, fsize);
 243 #else
 244                 line6pcm->prev_fbuf = fbuf;
 245 #endif
 246                 line6pcm->prev_fsize = fsize;
 247
 248 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 249                 if (!(line6pcm->flags & MASK_PCM_IMPULSE))
 250 #endif
 251                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags)
 252                             && (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 & MASK_PCM_IMPULSE))
 268 #endif
 269                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &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 = snd_pcm_lib_malloc_pages(substream,
 318                                        params_buffer_bytes(hw_params));
 319         if (ret < 0)
 320                 return ret;
 321
 322         line6pcm->period_in = params_period_bytes(hw_params);
 323         return 0;
 324 }
 325
 326 /* hw_free capture callback */
 327 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 328 {
 329         return snd_pcm_lib_free_pages(substream);
 330 }
 331
 332 /* trigger callback */
 333 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 334 {
 335         int err;
 336
 337         switch (cmd) {
 338         case SNDRV_PCM_TRIGGER_START:
 339 #ifdef CONFIG_PM
 340         case SNDRV_PCM_TRIGGER_RESUME:
 341 #endif
 342                 err = line6_pcm_start(line6pcm, MASK_PCM_ALSA_CAPTURE);
 343
 344                 if (err < 0)
 345                         return err;
 346
 347                 break;
 348
 349         case SNDRV_PCM_TRIGGER_STOP:
 350 #ifdef CONFIG_PM
 351         case SNDRV_PCM_TRIGGER_SUSPEND:
 352 #endif
 353                 err = line6_pcm_stop(line6pcm, MASK_PCM_ALSA_CAPTURE);
 354
 355                 if (err < 0)
 356                         return err;
 357
 358                 break;
 359
 360         default:
 361                 return -EINVAL;
 362         }
 363
 364         return 0;
 365 }
 366
 367 /* capture pointer callback */
 368 static snd_pcm_uframes_t
 369 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 370 {
 371         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 372         return line6pcm->pos_in_done;
 373 }
 374
 375 /* capture operators */
 376 struct snd_pcm_ops snd_line6_capture_ops = {
 377         .open = snd_line6_capture_open,
 378         .close = snd_line6_capture_close,
 379         .ioctl = snd_pcm_lib_ioctl,
 380         .hw_params = snd_line6_capture_hw_params,
 381         .hw_free = snd_line6_capture_hw_free,
 382         .prepare = snd_line6_prepare,
 383         .trigger = snd_line6_trigger,
 384         .pointer = snd_line6_capture_pointer,
 385 };
 386
 387 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 388 {
 389         int i;
 390
 391         /* create audio URBs and fill in constant values: */
 392         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 393                 struct urb *urb;
 394
 395                 /* URB for audio in: */
 396                 urb = line6pcm->urb_audio_in[i] =
 397                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 398
 399                 if (urb == NULL) {
 400                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 401                         return -ENOMEM;
 402                 }
 403
 404                 urb->dev = line6pcm->line6->usbdev;
 405                 urb->pipe =
 406                     usb_rcvisocpipe(line6pcm->line6->usbdev,
 407                                     line6pcm->ep_audio_read &
 408                                     USB_ENDPOINT_NUMBER_MASK);
 409                 urb->transfer_flags = URB_ISO_ASAP;
 410                 urb->start_frame = -1;
 411                 urb->number_of_packets = LINE6_ISO_PACKETS;
 412                 urb->interval = LINE6_ISO_INTERVAL;
 413                 urb->error_count = 0;
 414                 urb->complete = audio_in_callback;
 415         }
 416
 417         return 0;
 418 }