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 (line6pcm->pos_in_done + frames > runtime->buffer_size) {
 151                 /*
 152                    The transferred area goes over buffer boundary,
 153                    copy two separate chunks.
 154                  */
 155                 int len;
 156                 len = runtime->buffer_size - line6pcm->pos_in_done;
 157
 158                 if (len > 0) {
 159                         memcpy(runtime->dma_area +
 160                                line6pcm->pos_in_done * bytes_per_frame, fbuf,
 161                                len * bytes_per_frame);
 162                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
 163                                (frames - len) * bytes_per_frame);
 164                 } else
 165                         dev_err(line6pcm->line6->ifcdev, "driver bug: len = %d\n", len);        /* this is somewhat paranoid */
 166         } else {
 167                 /* copy single chunk */
 168                 memcpy(runtime->dma_area +
 169                        line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
 170         }
 171
 172         if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
 173                 line6pcm->pos_in_done -= runtime->buffer_size;
 174 }
 175
 176 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
 177 {
 178         struct snd_pcm_substream *substream =
 179             get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 180
 181         if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
 182                 line6pcm->bytes_in %= line6pcm->period_in;
 183                 snd_pcm_period_elapsed(substream);
 184         }
 185 }
 186
 187 /*
 188   Callback for completed capture URB.
 189 */
 190 static void audio_in_callback(struct urb *urb)
 191 {
 192         int i, index, length = 0, shutdown = 0;
 193         unsigned long flags;
 194
 195         struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 196
 197         line6pcm->last_frame_in = urb->start_frame;
 198
 199         /* find index of URB */
 200         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 201                 if (urb == line6pcm->urb_audio_in[index])
 202                         break;
 203
 204 #ifdef CONFIG_LINE6_USB_DUMP_PCM
 205         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 206                 struct usb_iso_packet_descriptor *fout =
 207                     &urb->iso_frame_desc[i];
 208                 line6_write_hexdump(line6pcm->line6, 'C',
 209                                     urb->transfer_buffer + fout->offset,
 210                                     fout->length);
 211         }
 212 #endif
 213
 214         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 215
 216         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 217                 char *fbuf;
 218                 int fsize;
 219                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 220
 221                 if (fin->status == -EXDEV) {
 222                         shutdown = 1;
 223                         break;
 224                 }
 225
 226                 fbuf = urb->transfer_buffer + fin->offset;
 227                 fsize = fin->actual_length;
 228
 229                 if (fsize > line6pcm->max_packet_size) {
 230                         dev_err(line6pcm->line6->ifcdev,
 231                                 "driver and/or device bug: packet too large (%d > %d)\n",
 232                                 fsize, line6pcm->max_packet_size);
 233                 }
 234
 235                 length += fsize;
 236
 237                 /* the following assumes LINE6_ISO_PACKETS == 1: */
 238 #if LINE6_BACKUP_MONITOR_SIGNAL
 239                 memcpy(line6pcm->prev_fbuf, fbuf, fsize);
 240 #else
 241                 line6pcm->prev_fbuf = fbuf;
 242 #endif
 243                 line6pcm->prev_fsize = fsize;
 244
 245 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 246                 if (!(line6pcm->flags & MASK_PCM_IMPULSE))
 247 #endif
 248                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags)
 249                             && (fsize > 0))
 250                                 line6_capture_copy(line6pcm, fbuf, fsize);
 251         }
 252
 253         clear_bit(index, &line6pcm->active_urb_in);
 254
 255         if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
 256                 shutdown = 1;
 257
 258         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 259
 260         if (!shutdown) {
 261                 submit_audio_in_urb(line6pcm);
 262
 263 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
 264                 if (!(line6pcm->flags & MASK_PCM_IMPULSE))
 265 #endif
 266                         if (test_bit(BIT_PCM_ALSA_CAPTURE, &line6pcm->flags))
 267                                 line6_capture_check_period(line6pcm, length);
 268         }
 269 }
 270
 271 /* open capture callback */
 272 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 273 {
 274         int err;
 275         struct snd_pcm_runtime *runtime = substream->runtime;
 276         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 277
 278         err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 279                                             SNDRV_PCM_HW_PARAM_RATE,
 280                                             (&line6pcm->
 281                                              properties->snd_line6_rates));
 282         if (err < 0)
 283                 return err;
 284
 285         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 286         return 0;
 287 }
 288
 289 /* close capture callback */
 290 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 291 {
 292         return 0;
 293 }
 294
 295 /* hw_params capture callback */
 296 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 297                                        struct snd_pcm_hw_params *hw_params)
 298 {
 299         int ret;
 300         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 301
 302         /* -- Florian Demski [FD] */
 303         /* don't ask me why, but this fixes the bug on my machine */
 304         if (line6pcm == NULL) {
 305                 if (substream->pcm == NULL)
 306                         return -ENOMEM;
 307                 if (substream->pcm->private_data == NULL)
 308                         return -ENOMEM;
 309                 substream->private_data = substream->pcm->private_data;
 310                 line6pcm = snd_pcm_substream_chip(substream);
 311         }
 312         /* -- [FD] end */
 313
 314         ret = snd_pcm_lib_malloc_pages(substream,
 315                                        params_buffer_bytes(hw_params));
 316         if (ret < 0)
 317                 return ret;
 318
 319         line6pcm->period_in = params_period_bytes(hw_params);
 320         return 0;
 321 }
 322
 323 /* hw_free capture callback */
 324 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 325 {
 326         return snd_pcm_lib_free_pages(substream);
 327 }
 328
 329 /* trigger callback */
 330 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
 331 {
 332         int err;
 333
 334         switch (cmd) {
 335         case SNDRV_PCM_TRIGGER_START:
 336 #ifdef CONFIG_PM
 337         case SNDRV_PCM_TRIGGER_RESUME:
 338 #endif
 339                 err = line6_pcm_start(line6pcm, MASK_PCM_ALSA_CAPTURE);
 340
 341                 if (err < 0)
 342                         return err;
 343
 344                 break;
 345
 346         case SNDRV_PCM_TRIGGER_STOP:
 347 #ifdef CONFIG_PM
 348         case SNDRV_PCM_TRIGGER_SUSPEND:
 349 #endif
 350                 err = line6_pcm_stop(line6pcm, MASK_PCM_ALSA_CAPTURE);
 351
 352                 if (err < 0)
 353                         return err;
 354
 355                 break;
 356
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         return 0;
 362 }
 363
 364 /* capture pointer callback */
 365 static snd_pcm_uframes_t
 366 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 367 {
 368         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 369         return line6pcm->pos_in_done;
 370 }
 371
 372 /* capture operators */
 373 struct snd_pcm_ops snd_line6_capture_ops = {
 374         .open = snd_line6_capture_open,
 375         .close = snd_line6_capture_close,
 376         .ioctl = snd_pcm_lib_ioctl,
 377         .hw_params = snd_line6_capture_hw_params,
 378         .hw_free = snd_line6_capture_hw_free,
 379         .prepare = snd_line6_prepare,
 380         .trigger = snd_line6_trigger,
 381         .pointer = snd_line6_capture_pointer,
 382 };
 383
 384 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 385 {
 386         int i;
 387
 388         /* create audio URBs and fill in constant values: */
 389         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 390                 struct urb *urb;
 391
 392                 /* URB for audio in: */
 393                 urb = line6pcm->urb_audio_in[i] =
 394                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 395
 396                 if (urb == NULL) {
 397                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 398                         return -ENOMEM;
 399                 }
 400
 401                 urb->dev = line6pcm->line6->usbdev;
 402                 urb->pipe =
 403                     usb_rcvisocpipe(line6pcm->line6->usbdev,
 404                                     line6pcm->ep_audio_read &
 405                                     USB_ENDPOINT_NUMBER_MASK);
 406                 urb->transfer_flags = URB_ISO_ASAP;
 407                 urb->start_frame = -1;
 408                 urb->number_of_packets = LINE6_ISO_PACKETS;
 409                 urb->interval = LINE6_ISO_INTERVAL;
 410                 urb->error_count = 0;
 411                 urb->complete = audio_in_callback;
 412         }
 413
 414         return 0;
 415 }