drivers/staging/line6/capture.c

   1 /*
   2  * Line6 Linux USB driver - 0.8.0
   3  *
   4  * Copyright (C) 2004-2009 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 "driver.h"
  13
  14 #include <sound/core.h>
  15 #include <sound/pcm.h>
  16 #include <sound/pcm_params.h>
  17
  18 #include "audio.h"
  19 #include "pcm.h"
  20 #include "pod.h"
  21 #include "capture.h"
  22
  23 /*
  24         Find a free URB and submit it.
  25 */
  26 static int submit_audio_in_urb(struct snd_pcm_substream *substream)
  27 {
  28         unsigned int index;
  29         unsigned long flags;
  30         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
  31         int i, urb_size;
  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 >= LINE6_ISO_BUFFERS) {
  39                 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  40                 dev_err(s2m(substream), "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 = substream;
  60
  61         if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
  62                 set_bit(index, &line6pcm->active_urb_in);
  63         else
  64                 dev_err(s2m(substream), "URB in #%d submission failed\n",
  65                         index);
  66
  67         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  68         return 0;
  69 }
  70
  71 /*
  72         Submit all currently available capture URBs.
  73 */
  74 static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
  75 {
  76         int ret, i;
  77
  78         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
  79                 ret = submit_audio_in_urb(substream);
  80                 if (ret < 0)
  81                         return ret;
  82         }
  83
  84         return 0;
  85 }
  86
  87 /*
  88         Unlink all currently active capture URBs.
  89 */
  90 static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  91 {
  92         unsigned int i;
  93
  94         for (i = LINE6_ISO_BUFFERS; i--;) {
  95                 if (test_bit(i, &line6pcm->active_urb_in)) {
  96                         if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
  97                                 struct urb *u = line6pcm->urb_audio_in[i];
  98                                 usb_unlink_urb(u);
  99                         }
 100                 }
 101         }
 102 }
 103
 104 /*
 105         Wait until unlinking of all currently active capture URBs has been
 106         finished.
 107 */
 108 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 109 {
 110         int timeout = HZ;
 111         unsigned int i;
 112         int alive;
 113
 114         do {
 115                 alive = 0;
 116                 for (i = LINE6_ISO_BUFFERS; i--;) {
 117                         if (test_bit(i, &line6pcm->active_urb_in))
 118                                 alive++;
 119                 }
 120                 if (!alive)
 121                         break;
 122                 set_current_state(TASK_UNINTERRUPTIBLE);
 123                 schedule_timeout(1);
 124         } while (--timeout > 0);
 125         if (alive)
 126                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 127
 128         line6pcm->active_urb_in = 0;
 129         line6pcm->unlink_urb_in = 0;
 130 }
 131
 132 /*
 133         Unlink all currently active capture URBs, and wait for finishing.
 134 */
 135 void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 136 {
 137         unlink_audio_in_urbs(line6pcm);
 138         wait_clear_audio_in_urbs(line6pcm);
 139 }
 140
 141 /*
 142         Callback for completed capture URB.
 143 */
 144 static void audio_in_callback(struct urb *urb)
 145 {
 146         int i, index, length = 0, shutdown = 0;
 147         int frames;
 148         unsigned long flags;
 149
 150         struct snd_pcm_substream *substream =
 151             (struct snd_pcm_substream *)urb->context;
 152         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 153         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 154         struct snd_pcm_runtime *runtime = substream->runtime;
 155
 156         /* find index of URB */
 157         for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
 158                 if (urb == line6pcm->urb_audio_in[index])
 159                         break;
 160
 161 #if DO_DUMP_PCM_RECEIVE
 162         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 163                 struct usb_iso_packet_descriptor *fout =
 164                     &urb->iso_frame_desc[i];
 165                 line6_write_hexdump(line6pcm->line6, 'C',
 166                                     urb->transfer_buffer + fout->offset,
 167                                     fout->length);
 168         }
 169 #endif
 170
 171         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 172
 173         for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 174                 char *fbuf;
 175                 int fsize;
 176                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 177
 178                 if (fin->status == -18) {
 179                         shutdown = 1;
 180                         break;
 181                 }
 182
 183                 fbuf = urb->transfer_buffer + fin->offset;
 184                 fsize = fin->actual_length;
 185                 length += fsize;
 186
 187                 if (fsize > 0) {
 188                         frames = fsize / bytes_per_frame;
 189
 190                         if (line6pcm->pos_in_done + frames >
 191                             runtime->buffer_size) {
 192                                 /*
 193                                    The transferred area goes over buffer
 194                                    boundary, copy two separate chunks.
 195                                  */
 196                                 int len;
 197                                 len =
 198                                     runtime->buffer_size -
 199                                     line6pcm->pos_in_done;
 200
 201                                 if (len > 0) {
 202                                         memcpy(runtime->dma_area +
 203                                                line6pcm->pos_in_done *
 204                                                bytes_per_frame, fbuf,
 205                                                len * bytes_per_frame);
 206                                         memcpy(runtime->dma_area,
 207                                                fbuf + len * bytes_per_frame,
 208                                                (frames -
 209                                                 len) * bytes_per_frame);
 210                                 } else {
 211                                         /* this is somewhat paranoid */
 212                                         dev_err(s2m(substream),
 213                                                 "driver bug: len = %d\n", len);
 214                                 }
 215                         } else {
 216                                 /* copy single chunk */
 217                                 memcpy(runtime->dma_area +
 218                                        line6pcm->pos_in_done * bytes_per_frame,
 219                                        fbuf, fsize * bytes_per_frame);
 220                         }
 221
 222                         line6pcm->pos_in_done += frames;
 223                         if (line6pcm->pos_in_done >= runtime->buffer_size)
 224                                 line6pcm->pos_in_done -= runtime->buffer_size;
 225                 }
 226         }
 227
 228         clear_bit(index, &line6pcm->active_urb_in);
 229
 230         if (test_bit(index, &line6pcm->unlink_urb_in))
 231                 shutdown = 1;
 232
 233         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 234
 235         if (!shutdown) {
 236                 submit_audio_in_urb(substream);
 237
 238                 line6pcm->bytes_in += length;
 239                 if (line6pcm->bytes_in >= line6pcm->period_in) {
 240                         line6pcm->bytes_in -= line6pcm->period_in;
 241                         snd_pcm_period_elapsed(substream);
 242                 }
 243         }
 244 }
 245
 246 /* open capture callback */
 247 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 248 {
 249         int err;
 250         struct snd_pcm_runtime *runtime = substream->runtime;
 251         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 252
 253         err = snd_pcm_hw_constraint_ratdens(runtime, 0,
 254                                             SNDRV_PCM_HW_PARAM_RATE,
 255                                             (&line6pcm->properties->
 256                                              snd_line6_rates));
 257         if (err < 0)
 258                 return err;
 259
 260         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 261         return 0;
 262 }
 263
 264 /* close capture callback */
 265 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 266 {
 267         return 0;
 268 }
 269
 270 /* hw_params capture callback */
 271 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
 272                                        struct snd_pcm_hw_params *hw_params)
 273 {
 274         int ret;
 275         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 276
 277         /* -- Florian Demski [FD] */
 278         /* don't ask me why, but this fixes the bug on my machine */
 279         if (line6pcm == NULL) {
 280                 if (substream->pcm == NULL)
 281                         return -ENOMEM;
 282                 if (substream->pcm->private_data == NULL)
 283                         return -ENOMEM;
 284                 substream->private_data = substream->pcm->private_data;
 285                 line6pcm = snd_pcm_substream_chip(substream);
 286         }
 287         /* -- [FD] end */
 288
 289         ret = snd_pcm_lib_malloc_pages(substream,
 290                                        params_buffer_bytes(hw_params));
 291         if (ret < 0)
 292                 return ret;
 293
 294         line6pcm->period_in = params_period_bytes(hw_params);
 295         line6pcm->buffer_in =
 296             kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
 297                     LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
 298
 299         if (!line6pcm->buffer_in) {
 300                 dev_err(s2m(substream), "cannot malloc buffer_in\n");
 301                 return -ENOMEM;
 302         }
 303
 304         return 0;
 305 }
 306
 307 /* hw_free capture callback */
 308 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 309 {
 310         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 311         unlink_wait_clear_audio_in_urbs(line6pcm);
 312
 313         kfree(line6pcm->buffer_in);
 314         line6pcm->buffer_in = NULL;
 315
 316         return snd_pcm_lib_free_pages(substream);
 317 }
 318
 319 /* trigger callback */
 320 int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 321 {
 322         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 323         int err;
 324         line6pcm->count_in = 0;
 325
 326         switch (cmd) {
 327         case SNDRV_PCM_TRIGGER_START:
 328                 if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
 329                         err = submit_audio_in_all_urbs(substream);
 330
 331                         if (err < 0) {
 332                                 clear_bit(BIT_RUNNING_CAPTURE,
 333                                           &line6pcm->flags);
 334                                 return err;
 335                         }
 336                 }
 337
 338                 break;
 339
 340         case SNDRV_PCM_TRIGGER_STOP:
 341                 if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
 342                         unlink_audio_in_urbs(line6pcm);
 343
 344                 break;
 345
 346         default:
 347                 return -EINVAL;
 348         }
 349
 350         return 0;
 351 }
 352
 353 /* capture pointer callback */
 354 static snd_pcm_uframes_t
 355 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 356 {
 357         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 358         return line6pcm->pos_in_done;
 359 }
 360
 361 /* capture operators */
 362 struct snd_pcm_ops snd_line6_capture_ops = {
 363         .open = snd_line6_capture_open,
 364         .close = snd_line6_capture_close,
 365         .ioctl = snd_pcm_lib_ioctl,
 366         .hw_params = snd_line6_capture_hw_params,
 367         .hw_free = snd_line6_capture_hw_free,
 368         .prepare = snd_line6_prepare,
 369         .trigger = snd_line6_trigger,
 370         .pointer = snd_line6_capture_pointer,
 371 };
 372
 373 int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 374 {
 375         int i;
 376
 377         /* create audio URBs and fill in constant values: */
 378         for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 379                 struct urb *urb;
 380
 381                 /* URB for audio in: */
 382                 urb = line6pcm->urb_audio_in[i] =
 383                     usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 384
 385                 if (urb == NULL) {
 386                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 387                         return -ENOMEM;
 388                 }
 389
 390                 urb->dev = line6pcm->line6->usbdev;
 391                 urb->pipe =
 392                     usb_rcvisocpipe(line6pcm->line6->usbdev,
 393                                     line6pcm->
 394                                     ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
 395                 urb->transfer_flags = URB_ISO_ASAP;
 396                 urb->start_frame = -1;
 397                 urb->number_of_packets = LINE6_ISO_PACKETS;
 398                 urb->interval = LINE6_ISO_INTERVAL;
 399                 urb->error_count = 0;
 400                 urb->complete = audio_in_callback;
 401         }
 402
 403         return 0;
 404 }