kernel/drivers/media/usb/go7007/snd-go7007.c

   1 /*
   2  * Copyright (C) 2005-2006 Micronas USA Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License (Version 2) as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/time.h>
  22 #include <linux/mm.h>
  23 #include <linux/i2c.h>
  24 #include <linux/mutex.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/slab.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/initval.h>
  30
  31 #include "go7007-priv.h"
  32
  33 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  34 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  35 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  36
  37 module_param_array(index, int, NULL, 0444);
  38 module_param_array(id, charp, NULL, 0444);
  39 module_param_array(enable, bool, NULL, 0444);
  40 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
  41 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
  42 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
  43
  44 struct go7007_snd {
  45         struct snd_card *card;
  46         struct snd_pcm *pcm;
  47         struct snd_pcm_substream *substream;
  48         spinlock_t lock;
  49         int w_idx;
  50         int hw_ptr;
  51         int avail;
  52         int capturing;
  53 };
  54
  55 static struct snd_pcm_hardware go7007_snd_capture_hw = {
  56         .info                   = (SNDRV_PCM_INFO_MMAP |
  57                                         SNDRV_PCM_INFO_INTERLEAVED |
  58                                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
  59                                         SNDRV_PCM_INFO_MMAP_VALID),
  60         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  61         .rates                  = SNDRV_PCM_RATE_48000,
  62         .rate_min               = 48000,
  63         .rate_max               = 48000,
  64         .channels_min           = 2,
  65         .channels_max           = 2,
  66         .buffer_bytes_max       = (128*1024),
  67         .period_bytes_min       = 4096,
  68         .period_bytes_max       = (128*1024),
  69         .periods_min            = 1,
  70         .periods_max            = 32,
  71 };
  72
  73 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
  74 {
  75         struct go7007_snd *gosnd = go->snd_context;
  76         struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
  77         int frames = bytes_to_frames(runtime, length);
  78
  79         spin_lock(&gosnd->lock);
  80         gosnd->hw_ptr += frames;
  81         if (gosnd->hw_ptr >= runtime->buffer_size)
  82                 gosnd->hw_ptr -= runtime->buffer_size;
  83         gosnd->avail += frames;
  84         spin_unlock(&gosnd->lock);
  85         if (gosnd->w_idx + length > runtime->dma_bytes) {
  86                 int cpy = runtime->dma_bytes - gosnd->w_idx;
  87
  88                 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
  89                 length -= cpy;
  90                 buf += cpy;
  91                 gosnd->w_idx = 0;
  92         }
  93         memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
  94         gosnd->w_idx += length;
  95         spin_lock(&gosnd->lock);
  96         if (gosnd->avail < runtime->period_size) {
  97                 spin_unlock(&gosnd->lock);
  98                 return;
  99         }
 100         gosnd->avail -= runtime->period_size;
 101         spin_unlock(&gosnd->lock);
 102         if (gosnd->capturing)
 103                 snd_pcm_period_elapsed(gosnd->substream);
 104 }
 105
 106 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
 107                                 struct snd_pcm_hw_params *hw_params)
 108 {
 109         struct go7007 *go = snd_pcm_substream_chip(substream);
 110         unsigned int bytes;
 111
 112         bytes = params_buffer_bytes(hw_params);
 113         if (substream->runtime->dma_bytes > 0)
 114                 vfree(substream->runtime->dma_area);
 115         substream->runtime->dma_bytes = 0;
 116         substream->runtime->dma_area = vmalloc(bytes);
 117         if (substream->runtime->dma_area == NULL)
 118                 return -ENOMEM;
 119         substream->runtime->dma_bytes = bytes;
 120         go->audio_deliver = parse_audio_stream_data;
 121         return 0;
 122 }
 123
 124 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
 125 {
 126         struct go7007 *go = snd_pcm_substream_chip(substream);
 127
 128         go->audio_deliver = NULL;
 129         if (substream->runtime->dma_bytes > 0)
 130                 vfree(substream->runtime->dma_area);
 131         substream->runtime->dma_bytes = 0;
 132         return 0;
 133 }
 134
 135 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
 136 {
 137         struct go7007 *go = snd_pcm_substream_chip(substream);
 138         struct go7007_snd *gosnd = go->snd_context;
 139         unsigned long flags;
 140         int r;
 141
 142         spin_lock_irqsave(&gosnd->lock, flags);
 143         if (gosnd->substream == NULL) {
 144                 gosnd->substream = substream;
 145                 substream->runtime->hw = go7007_snd_capture_hw;
 146                 r = 0;
 147         } else
 148                 r = -EBUSY;
 149         spin_unlock_irqrestore(&gosnd->lock, flags);
 150         return r;
 151 }
 152
 153 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
 154 {
 155         struct go7007 *go = snd_pcm_substream_chip(substream);
 156         struct go7007_snd *gosnd = go->snd_context;
 157
 158         gosnd->substream = NULL;
 159         return 0;
 160 }
 161
 162 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
 163 {
 164         return 0;
 165 }
 166
 167 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 168 {
 169         struct go7007 *go = snd_pcm_substream_chip(substream);
 170         struct go7007_snd *gosnd = go->snd_context;
 171
 172         switch (cmd) {
 173         case SNDRV_PCM_TRIGGER_START:
 174                 /* Just set a flag to indicate we should signal ALSA when
 175                  * sound comes in */
 176                 gosnd->capturing = 1;
 177                 return 0;
 178         case SNDRV_PCM_TRIGGER_STOP:
 179                 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 180                 gosnd->capturing = 0;
 181                 return 0;
 182         default:
 183                 return -EINVAL;
 184         }
 185 }
 186
 187 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
 188 {
 189         struct go7007 *go = snd_pcm_substream_chip(substream);
 190         struct go7007_snd *gosnd = go->snd_context;
 191
 192         return gosnd->hw_ptr;
 193 }
 194
 195 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
 196                                         unsigned long offset)
 197 {
 198         return vmalloc_to_page(substream->runtime->dma_area + offset);
 199 }
 200
 201 static struct snd_pcm_ops go7007_snd_capture_ops = {
 202         .open           = go7007_snd_capture_open,
 203         .close          = go7007_snd_capture_close,
 204         .ioctl          = snd_pcm_lib_ioctl,
 205         .hw_params      = go7007_snd_hw_params,
 206         .hw_free        = go7007_snd_hw_free,
 207         .prepare        = go7007_snd_pcm_prepare,
 208         .trigger        = go7007_snd_pcm_trigger,
 209         .pointer        = go7007_snd_pcm_pointer,
 210         .page           = go7007_snd_pcm_page,
 211 };
 212
 213 static int go7007_snd_free(struct snd_device *device)
 214 {
 215         struct go7007 *go = device->device_data;
 216
 217         kfree(go->snd_context);
 218         go->snd_context = NULL;
 219         return 0;
 220 }
 221
 222 static struct snd_device_ops go7007_snd_device_ops = {
 223         .dev_free       = go7007_snd_free,
 224 };
 225
 226 int go7007_snd_init(struct go7007 *go)
 227 {
 228         static int dev;
 229         struct go7007_snd *gosnd;
 230         int ret = 0;
 231
 232         if (dev >= SNDRV_CARDS)
 233                 return -ENODEV;
 234         if (!enable[dev]) {
 235                 dev++;
 236                 return -ENOENT;
 237         }
 238         gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
 239         if (gosnd == NULL)
 240                 return -ENOMEM;
 241         spin_lock_init(&gosnd->lock);
 242         gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 243         gosnd->capturing = 0;
 244         ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
 245                            &gosnd->card);
 246         if (ret < 0) {
 247                 kfree(gosnd);
 248                 return ret;
 249         }
 250         ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
 251                         &go7007_snd_device_ops);
 252         if (ret < 0) {
 253                 kfree(gosnd);
 254                 return ret;
 255         }
 256         ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
 257         if (ret < 0) {
 258                 snd_card_free(gosnd->card);
 259                 kfree(gosnd);
 260                 return ret;
 261         }
 262         strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
 263         strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
 264         strlcpy(gosnd->card->longname, gosnd->card->shortname,
 265                         sizeof(gosnd->card->longname));
 266
 267         gosnd->pcm->private_data = go;
 268         snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
 269                         &go7007_snd_capture_ops);
 270
 271         ret = snd_card_register(gosnd->card);
 272         if (ret < 0) {
 273                 snd_card_free(gosnd->card);
 274                 kfree(gosnd);
 275                 return ret;
 276         }
 277
 278         gosnd->substream = NULL;
 279         go->snd_context = gosnd;
 280         v4l2_device_get(&go->v4l2_dev);
 281         ++dev;
 282
 283         return 0;
 284 }
 285 EXPORT_SYMBOL(go7007_snd_init);
 286
 287 int go7007_snd_remove(struct go7007 *go)
 288 {
 289         struct go7007_snd *gosnd = go->snd_context;
 290
 291         snd_card_disconnect(gosnd->card);
 292         snd_card_free_when_closed(gosnd->card);
 293         v4l2_device_put(&go->v4l2_dev);
 294         return 0;
 295 }
 296 EXPORT_SYMBOL(go7007_snd_remove);
 297
 298 MODULE_LICENSE("GPL v2");