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
  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         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 = 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(s2m(substream), "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 = &urb_in->iso_frame_desc[i];
  48                 fin->offset = urb_size;
  49                 fin->length = line6pcm->max_packet_size;
  50                 urb_size += line6pcm->max_packet_size;
  51         }
  52
  53         urb_in->transfer_buffer = line6pcm->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
  54         urb_in->transfer_buffer_length = urb_size;
  55         urb_in->context = substream;
  56
  57         if(usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
  58                 set_bit(index, &line6pcm->active_urb_in);
  59         else
  60                 dev_err(s2m(substream), "URB in #%d submission failed\n", index);
  61
  62         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  63         return 0;
  64 }
  65
  66 /*
  67         Submit all currently available capture URBs.
  68 */
  69 static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
  70 {
  71         int ret, i;
  72
  73         for(i = 0; i < LINE6_ISO_BUFFERS; ++i)
  74                 if((ret = submit_audio_in_urb(substream)) < 0)
  75                         return ret;
  76
  77         return 0;
  78 }
  79
  80 /*
  81         Unlink all currently active capture URBs.
  82 */
  83 static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  84 {
  85         unsigned int i;
  86
  87         for(i = LINE6_ISO_BUFFERS; i--;) {
  88                 if(test_bit(i, &line6pcm->active_urb_in)) {
  89                         if(!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
  90                                 struct urb *u = line6pcm->urb_audio_in[i];
  91                                 usb_unlink_urb(u);
  92                         }
  93                 }
  94         }
  95 }
  96
  97 /*
  98         Wait until unlinking of all currently active capture URBs has been finished.
  99 */
 100 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 101 {
 102         int timeout = HZ;
 103         unsigned int i;
 104         int alive;
 105
 106         do {
 107                 alive = 0;
 108                 for (i = LINE6_ISO_BUFFERS; i--;) {
 109                         if (test_bit(i, &line6pcm->active_urb_in))
 110                                 alive++;
 111                 }
 112                 if (! alive)
 113                         break;
 114                 set_current_state(TASK_UNINTERRUPTIBLE);
 115                 schedule_timeout(1);
 116         } while (--timeout > 0);
 117         if (alive)
 118                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 119
 120         line6pcm->active_urb_in = 0;
 121         line6pcm->unlink_urb_in = 0;
 122 }
 123
 124 /*
 125         Unlink all currently active capture URBs, and wait for finishing.
 126 */
 127 void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 128 {
 129         unlink_audio_in_urbs(line6pcm);
 130         wait_clear_audio_in_urbs(line6pcm);
 131 }
 132
 133 /*
 134         Callback for completed capture URB.
 135 */
 136 static void audio_in_callback(struct urb *urb)
 137 {
 138         int i, index, length = 0, shutdown = 0;
 139         int frames;
 140         unsigned long flags;
 141
 142         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
 143         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 144         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 145         struct snd_pcm_runtime *runtime = substream->runtime;
 146
 147         /* find index of URB */
 148         for(index = 0; index < LINE6_ISO_BUFFERS; ++index)
 149                 if(urb == line6pcm->urb_audio_in[index])
 150                         break;
 151
 152 #if DO_DUMP_PCM_RECEIVE
 153         for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
 154                 struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
 155                 line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
 156         }
 157 #endif
 158
 159         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 160
 161         for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
 162                 char *fbuf;
 163                 int fsize;
 164                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 165
 166                 if(fin->status == -18) {
 167                         shutdown = 1;
 168                         break;
 169                 }
 170
 171                 fbuf = urb->transfer_buffer + fin->offset;
 172                 fsize = fin->actual_length;
 173                 length += fsize;
 174
 175                 if(fsize > 0) {
 176                         frames = fsize / bytes_per_frame;
 177
 178                         if(line6pcm->pos_in_done + frames > runtime->buffer_size) {
 179                                 /*
 180                                         The transferred area goes over buffer boundary,
 181                                         copy two separate chunks.
 182                                 */
 183                                 int len;
 184                                 len = runtime->buffer_size - line6pcm->pos_in_done;
 185
 186                                 if(len > 0) {
 187                                         memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
 188                                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
 189                                 }
 190                                 else
 191                                         dev_err(s2m(substream), "driver bug: len = %d\n", len);  /* this is somewhat paranoid */
 192                         }
 193                         else {
 194                                 /* copy single chunk */
 195                                 memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
 196                         }
 197
 198                         if((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
 199                                 line6pcm->pos_in_done -= runtime->buffer_size;
 200                 }
 201         }
 202
 203         clear_bit(index, &line6pcm->active_urb_in);
 204
 205         if(test_bit(index, &line6pcm->unlink_urb_in))
 206                 shutdown = 1;
 207
 208         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 209
 210         if(!shutdown) {
 211                 submit_audio_in_urb(substream);
 212
 213                 if((line6pcm->bytes_in += length) >= line6pcm->period_in) {
 214                         line6pcm->bytes_in -= line6pcm->period_in;
 215                         snd_pcm_period_elapsed(substream);
 216                 }
 217         }
 218 }
 219
 220 /* open capture callback */
 221 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 222 {
 223         int err;
 224         struct snd_pcm_runtime *runtime = substream->runtime;
 225         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 226
 227         if((err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 228                                                                                                                                                                         (&line6pcm->properties->snd_line6_rates))) < 0)
 229                 return err;
 230
 231         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 232         return 0;
 233 }
 234
 235 /* close capture callback */
 236 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 237 {
 238         return 0;
 239 }
 240
 241 /* hw_params capture callback */
 242 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
 243 {
 244         int ret;
 245         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 246
 247         /* -- Florian Demski [FD] */
 248         /* don't ask me why, but this fixes the bug on my machine */
 249         if ( line6pcm == NULL ) {
 250                 if ( substream->pcm == NULL )
 251                         return -ENOMEM;
 252                 if ( substream->pcm->private_data == NULL )
 253                         return -ENOMEM;
 254                 substream->private_data = substream->pcm->private_data;
 255                 line6pcm = snd_pcm_substream_chip( substream );
 256         }
 257         /* -- [FD] end */
 258
 259         if((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
 260                 return ret;
 261
 262         line6pcm->period_in = params_period_bytes(hw_params);
 263         line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
 264
 265         if(!line6pcm->buffer_in) {
 266                 dev_err(s2m(substream), "cannot malloc buffer_in\n");
 267                 return -ENOMEM;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /* hw_free capture callback */
 274 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 275 {
 276         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 277         unlink_wait_clear_audio_in_urbs(line6pcm);
 278
 279         if(line6pcm->buffer_in) {
 280                 kfree(line6pcm->buffer_in);
 281                 line6pcm->buffer_in = 0;
 282         }
 283
 284         return snd_pcm_lib_free_pages(substream);
 285 }
 286
 287 /* trigger callback */
 288 int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 289 {
 290         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 291         int err;
 292         line6pcm->count_in = 0;
 293
 294         switch(cmd) {
 295         case SNDRV_PCM_TRIGGER_START:
 296                 if(!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
 297                         err = submit_audio_in_all_urbs(substream);
 298
 299                         if(err < 0) {
 300                                 clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
 301                                 return err;
 302                         }
 303                 }
 304
 305                 break;
 306
 307         case SNDRV_PCM_TRIGGER_STOP:
 308                 if(test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
 309                         unlink_audio_in_urbs(line6pcm);
 310
 311                 break;
 312
 313         default:
 314                 return -EINVAL;
 315         }
 316
 317         return 0;
 318 }
 319
 320 /* capture pointer callback */
 321 static snd_pcm_uframes_t
 322 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 323 {
 324         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 325         return line6pcm->pos_in_done;
 326 }
 327
 328 /* capture operators */
 329 struct snd_pcm_ops snd_line6_capture_ops = {
 330         .open =        snd_line6_capture_open,
 331         .close =       snd_line6_capture_close,
 332         .ioctl =       snd_pcm_lib_ioctl,
 333         .hw_params =   snd_line6_capture_hw_params,
 334         .hw_free =     snd_line6_capture_hw_free,
 335         .prepare =     snd_line6_prepare,
 336         .trigger =     snd_line6_trigger,
 337         .pointer =     snd_line6_capture_pointer,
 338 };
 339
 340 int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 341 {
 342         int i;
 343
 344         /* create audio URBs and fill in constant values: */
 345         for(i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 346                 struct urb *urb;
 347
 348                 /* URB for audio in: */
 349                 urb = line6pcm->urb_audio_in[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 350
 351                 if(urb == NULL) {
 352                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 353                         return -ENOMEM;
 354                 }
 355
 356                 urb->dev = line6pcm->line6->usbdev;
 357                 urb->pipe = usb_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
 358                 urb->transfer_flags = URB_ISO_ASAP;
 359                 urb->start_frame = -1;
 360                 urb->number_of_packets = LINE6_ISO_PACKETS;
 361                 urb->interval = LINE6_ISO_INTERVAL;
 362                 urb->error_count = 0;
 363                 urb->complete = audio_in_callback;
 364         }
 365
 366         return 0;
 367 }