SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 /*
  25         Find a free URB and submit it.
  26 */
  27 static int submit_audio_in_urb(struct snd_pcm_substream *substream)
  28 {
  29         int index;
  30         unsigned long flags;
  31         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
  32         int i, urb_size;
  33         struct urb *urb_in;
  34
  35         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
  36         index = 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(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 = &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 = line6pcm->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
  55         urb_in->transfer_buffer_length = urb_size;
  56         urb_in->context = substream;
  57
  58         if(usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
  59                 set_bit(index, &line6pcm->active_urb_in);
  60         else
  61                 dev_err(s2m(substream), "URB in #%d submission failed\n", index);
  62
  63         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
  64         return 0;
  65 }
  66
  67 /*
  68         Submit all currently available capture URBs.
  69 */
  70 static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
  71 {
  72         int ret, i;
  73
  74         for(i = 0; i < LINE6_ISO_BUFFERS; ++i)
  75                 if((ret = submit_audio_in_urb(substream)) < 0)
  76                         return ret;
  77
  78         return 0;
  79 }
  80
  81 /*
  82         Unlink all currently active capture URBs.
  83 */
  84 static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
  85 {
  86         unsigned int i;
  87
  88         for(i = LINE6_ISO_BUFFERS; i--;) {
  89                 if(test_bit(i, &line6pcm->active_urb_in)) {
  90                         if(!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
  91                                 struct urb *u = line6pcm->urb_audio_in[i];
  92                                 usb_unlink_urb(u);
  93                         }
  94                 }
  95         }
  96 }
  97
  98 /*
  99         Wait until unlinking of all currently active capture URBs has been finished.
 100 */
 101 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 102 {
 103         int timeout = HZ;
 104         unsigned int i;
 105         int alive;
 106
 107         do {
 108                 alive = 0;
 109                 for (i = LINE6_ISO_BUFFERS; i--;) {
 110                         if (test_bit(i, &line6pcm->active_urb_in))
 111                                 alive++;
 112                 }
 113                 if (! alive)
 114                         break;
 115                 set_current_state(TASK_UNINTERRUPTIBLE);
 116                 schedule_timeout(1);
 117         } while (--timeout > 0);
 118         if (alive)
 119                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 120
 121         line6pcm->active_urb_in = 0;
 122         line6pcm->unlink_urb_in = 0;
 123 }
 124
 125 /*
 126         Unlink all currently active capture URBs, and wait for finishing.
 127 */
 128 void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 129 {
 130         unlink_audio_in_urbs(line6pcm);
 131         wait_clear_audio_in_urbs(line6pcm);
 132 }
 133
 134 /*
 135         Callback for completed capture URB.
 136 */
 137 static void audio_in_callback(struct urb *urb)
 138 {
 139         int i, index, length = 0, shutdown = 0;
 140         int frames;
 141         unsigned long flags;
 142
 143         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
 144         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 145         const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147
 148         /* find index of URB */
 149         for(index = 0; index < LINE6_ISO_BUFFERS; ++index)
 150                 if(urb == line6pcm->urb_audio_in[index])
 151                         break;
 152
 153 #if DO_DUMP_PCM_RECEIVE
 154         for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
 155                 struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
 156                 line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
 157         }
 158 #endif
 159
 160         spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
 161
 162         for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
 163                 char *fbuf;
 164                 int fsize;
 165                 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
 166
 167                 if(fin->status == -18) {
 168                         shutdown = 1;
 169                         break;
 170                 }
 171
 172                 fbuf = urb->transfer_buffer + fin->offset;
 173                 fsize = fin->actual_length;
 174                 length += fsize;
 175
 176                 if(fsize > 0) {
 177                         frames = fsize / bytes_per_frame;
 178
 179                         if(line6pcm->pos_in_done + frames > runtime->buffer_size) {
 180                                 /*
 181                                         The transferred area goes over buffer boundary,
 182                                         copy two separate chunks.
 183                                 */
 184                                 int len;
 185                                 len = runtime->buffer_size - line6pcm->pos_in_done;
 186
 187                                 if(len > 0) {
 188                                         memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
 189                                         memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
 190                                 }
 191                                 else
 192                                         dev_err(s2m(substream), "driver bug: len = %d\n", len);  /* this is somewhat paranoid */
 193                         }
 194                         else {
 195                                 /* copy single chunk */
 196                                 memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
 197                         }
 198
 199                         if((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
 200                                 line6pcm->pos_in_done -= runtime->buffer_size;
 201                 }
 202         }
 203
 204         clear_bit(index, &line6pcm->active_urb_in);
 205
 206         if(test_bit(index, &line6pcm->unlink_urb_in))
 207                 shutdown = 1;
 208
 209         spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
 210
 211         if(!shutdown) {
 212                 submit_audio_in_urb(substream);
 213
 214                 if((line6pcm->bytes_in += length) >= line6pcm->period_in) {
 215                         line6pcm->bytes_in -= line6pcm->period_in;
 216                         snd_pcm_period_elapsed(substream);
 217                 }
 218         }
 219 }
 220
 221 /* open capture callback */
 222 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
 223 {
 224         int err;
 225         struct snd_pcm_runtime *runtime = substream->runtime;
 226         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 227
 228         if((err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 229                                                                                                                                                                         (&line6pcm->properties->snd_line6_rates))) < 0)
 230                 return err;
 231
 232         runtime->hw = line6pcm->properties->snd_line6_capture_hw;
 233         return 0;
 234 }
 235
 236 /* close capture callback */
 237 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
 238 {
 239         return 0;
 240 }
 241
 242 /* hw_params capture callback */
 243 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
 244 {
 245         int ret;
 246         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 247
 248         /* -- Florian Demski [FD] */
 249         /* don't ask me why, but this fixes the bug on my machine */
 250         if ( line6pcm == NULL ) {
 251                 if ( substream->pcm == NULL )
 252                         return -ENOMEM;
 253                 if ( substream->pcm->private_data == NULL )
 254                         return -ENOMEM;
 255                 substream->private_data = substream->pcm->private_data;
 256                 line6pcm = snd_pcm_substream_chip( substream );
 257         }
 258         /* -- [FD] end */
 259
 260         if((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
 261                 return ret;
 262
 263         line6pcm->period_in = params_period_bytes(hw_params);
 264         line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
 265
 266         if(!line6pcm->buffer_in) {
 267                 dev_err(s2m(substream), "cannot malloc buffer_in\n");
 268                 return -ENOMEM;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /* hw_free capture callback */
 275 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
 276 {
 277         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 278         unlink_wait_clear_audio_in_urbs(line6pcm);
 279
 280         if(line6pcm->buffer_in) {
 281                 kfree(line6pcm->buffer_in);
 282                 line6pcm->buffer_in = NULL;
 283         }
 284
 285         return snd_pcm_lib_free_pages(substream);
 286 }
 287
 288 /* trigger callback */
 289 int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 290 {
 291         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 292         int err;
 293         line6pcm->count_in = 0;
 294
 295         switch(cmd) {
 296         case SNDRV_PCM_TRIGGER_START:
 297                 if(!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
 298                         err = submit_audio_in_all_urbs(substream);
 299
 300                         if(err < 0) {
 301                                 clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
 302                                 return err;
 303                         }
 304                 }
 305
 306                 break;
 307
 308         case SNDRV_PCM_TRIGGER_STOP:
 309                 if(test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
 310                         unlink_audio_in_urbs(line6pcm);
 311
 312                 break;
 313
 314         default:
 315                 return -EINVAL;
 316         }
 317
 318         return 0;
 319 }
 320
 321 /* capture pointer callback */
 322 static snd_pcm_uframes_t
 323 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
 324 {
 325         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
 326         return line6pcm->pos_in_done;
 327 }
 328
 329 /* capture operators */
 330 struct snd_pcm_ops snd_line6_capture_ops = {
 331         .open =        snd_line6_capture_open,
 332         .close =       snd_line6_capture_close,
 333         .ioctl =       snd_pcm_lib_ioctl,
 334         .hw_params =   snd_line6_capture_hw_params,
 335         .hw_free =     snd_line6_capture_hw_free,
 336         .prepare =     snd_line6_prepare,
 337         .trigger =     snd_line6_trigger,
 338         .pointer =     snd_line6_capture_pointer,
 339 };
 340
 341 int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
 342 {
 343         int i;
 344
 345         /* create audio URBs and fill in constant values: */
 346         for(i = 0; i < LINE6_ISO_BUFFERS; ++i) {
 347                 struct urb *urb;
 348
 349                 /* URB for audio in: */
 350                 urb = line6pcm->urb_audio_in[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
 351
 352                 if(urb == NULL) {
 353                         dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
 354                         return -ENOMEM;
 355                 }
 356
 357                 urb->dev = line6pcm->line6->usbdev;
 358                 urb->pipe = usb_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
 359                 urb->transfer_flags = URB_ISO_ASAP;
 360                 urb->start_frame = -1;
 361                 urb->number_of_packets = LINE6_ISO_PACKETS;
 362                 urb->interval = LINE6_ISO_INTERVAL;
 363                 urb->error_count = 0;
 364                 urb->complete = audio_in_callback;
 365         }
 366
 367         return 0;
 368 }