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 const 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         unsigned long flags;
  79
  80         spin_lock_irqsave(&gosnd->lock, flags);
  81         gosnd->hw_ptr += frames;
  82         if (gosnd->hw_ptr >= runtime->buffer_size)
  83                 gosnd->hw_ptr -= runtime->buffer_size;
  84         gosnd->avail += frames;
  85         spin_unlock_irqrestore(&gosnd->lock, flags);
  86         if (gosnd->w_idx + length > runtime->dma_bytes) {
  87                 int cpy = runtime->dma_bytes - gosnd->w_idx;
  88
  89                 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
  90                 length -= cpy;
  91                 buf += cpy;
  92                 gosnd->w_idx = 0;
  93         }
  94         memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
  95         gosnd->w_idx += length;
  96         spin_lock_irqsave(&gosnd->lock, flags);
  97         if (gosnd->avail < runtime->period_size) {
  98                 spin_unlock_irqrestore(&gosnd->lock, flags);
  99                 return;
 100         }
 101         gosnd->avail -= runtime->period_size;
 102         spin_unlock_irqrestore(&gosnd->lock, flags);
 103         if (gosnd->capturing)
 104                 snd_pcm_period_elapsed(gosnd->substream);
 105 }
 106
 107 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
 108                                 struct snd_pcm_hw_params *hw_params)
 109 {
 110         struct go7007 *go = snd_pcm_substream_chip(substream);
 111         unsigned int bytes;
 112
 113         bytes = params_buffer_bytes(hw_params);
 114         if (substream->runtime->dma_bytes > 0)
 115                 vfree(substream->runtime->dma_area);
 116         substream->runtime->dma_bytes = 0;
 117         substream->runtime->dma_area = vmalloc(bytes);
 118         if (substream->runtime->dma_area == NULL)
 119                 return -ENOMEM;
 120         substream->runtime->dma_bytes = bytes;
 121         go->audio_deliver = parse_audio_stream_data;
 122         return 0;
 123 }
 124
 125 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
 126 {
 127         struct go7007 *go = snd_pcm_substream_chip(substream);
 128
 129         go->audio_deliver = NULL;
 130         if (substream->runtime->dma_bytes > 0)
 131                 vfree(substream->runtime->dma_area);
 132         substream->runtime->dma_bytes = 0;
 133         return 0;
 134 }
 135
 136 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
 137 {
 138         struct go7007 *go = snd_pcm_substream_chip(substream);
 139         struct go7007_snd *gosnd = go->snd_context;
 140         unsigned long flags;
 141         int r;
 142
 143         spin_lock_irqsave(&gosnd->lock, flags);
 144         if (gosnd->substream == NULL) {
 145                 gosnd->substream = substream;
 146                 substream->runtime->hw = go7007_snd_capture_hw;
 147                 r = 0;
 148         } else
 149                 r = -EBUSY;
 150         spin_unlock_irqrestore(&gosnd->lock, flags);
 151         return r;
 152 }
 153
 154 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
 155 {
 156         struct go7007 *go = snd_pcm_substream_chip(substream);
 157         struct go7007_snd *gosnd = go->snd_context;
 158
 159         gosnd->substream = NULL;
 160         return 0;
 161 }
 162
 163 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
 164 {
 165         return 0;
 166 }
 167
 168 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 169 {
 170         struct go7007 *go = snd_pcm_substream_chip(substream);
 171         struct go7007_snd *gosnd = go->snd_context;
 172
 173         switch (cmd) {
 174         case SNDRV_PCM_TRIGGER_START:
 175                 /* Just set a flag to indicate we should signal ALSA when
 176                  * sound comes in */
 177                 gosnd->capturing = 1;
 178                 return 0;
 179         case SNDRV_PCM_TRIGGER_STOP:
 180                 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 181                 gosnd->capturing = 0;
 182                 return 0;
 183         default:
 184                 return -EINVAL;
 185         }
 186 }
 187
 188 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
 189 {
 190         struct go7007 *go = snd_pcm_substream_chip(substream);
 191         struct go7007_snd *gosnd = go->snd_context;
 192
 193         return gosnd->hw_ptr;
 194 }
 195
 196 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
 197                                         unsigned long offset)
 198 {
 199         return vmalloc_to_page(substream->runtime->dma_area + offset);
 200 }
 201
 202 static const struct snd_pcm_ops go7007_snd_capture_ops = {
 203         .open           = go7007_snd_capture_open,
 204         .close          = go7007_snd_capture_close,
 205         .ioctl          = snd_pcm_lib_ioctl,
 206         .hw_params      = go7007_snd_hw_params,
 207         .hw_free        = go7007_snd_hw_free,
 208         .prepare        = go7007_snd_pcm_prepare,
 209         .trigger        = go7007_snd_pcm_trigger,
 210         .pointer        = go7007_snd_pcm_pointer,
 211         .page           = go7007_snd_pcm_page,
 212 };
 213
 214 static int go7007_snd_free(struct snd_device *device)
 215 {
 216         struct go7007 *go = device->device_data;
 217
 218         kfree(go->snd_context);
 219         go->snd_context = NULL;
 220         return 0;
 221 }
 222
 223 static struct snd_device_ops go7007_snd_device_ops = {
 224         .dev_free       = go7007_snd_free,
 225 };
 226
 227 int go7007_snd_init(struct go7007 *go)
 228 {
 229         static int dev;
 230         struct go7007_snd *gosnd;
 231         int ret;
 232
 233         if (dev >= SNDRV_CARDS)
 234                 return -ENODEV;
 235         if (!enable[dev]) {
 236                 dev++;
 237                 return -ENOENT;
 238         }
 239         gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
 240         if (gosnd == NULL)
 241                 return -ENOMEM;
 242         spin_lock_init(&gosnd->lock);
 243         gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 244         gosnd->capturing = 0;
 245         ret = snd_card_new(go->dev, index[dev], id[dev], THIS_MODULE, 0,
 246                            &gosnd->card);
 247         if (ret < 0) {
 248                 kfree(gosnd);
 249                 return ret;
 250         }
 251         ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
 252                         &go7007_snd_device_ops);
 253         if (ret < 0) {
 254                 kfree(gosnd);
 255                 return ret;
 256         }
 257         ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
 258         if (ret < 0) {
 259                 snd_card_free(gosnd->card);
 260                 kfree(gosnd);
 261                 return ret;
 262         }
 263         strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
 264         strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
 265         strlcpy(gosnd->card->longname, gosnd->card->shortname,
 266                         sizeof(gosnd->card->longname));
 267
 268         gosnd->pcm->private_data = go;
 269         snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
 270                         &go7007_snd_capture_ops);
 271
 272         ret = snd_card_register(gosnd->card);
 273         if (ret < 0) {
 274                 snd_card_free(gosnd->card);
 275                 kfree(gosnd);
 276                 return ret;
 277         }
 278
 279         gosnd->substream = NULL;
 280         go->snd_context = gosnd;
 281         v4l2_device_get(&go->v4l2_dev);
 282         ++dev;
 283
 284         return 0;
 285 }
 286 EXPORT_SYMBOL(go7007_snd_init);
 287
 288 int go7007_snd_remove(struct go7007 *go)
 289 {
 290         struct go7007_snd *gosnd = go->snd_context;
 291
 292         snd_card_disconnect(gosnd->card);
 293         snd_card_free_when_closed(gosnd->card);
 294         v4l2_device_put(&go->v4l2_dev);
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(go7007_snd_remove);
 298
 299 MODULE_LICENSE("GPL v2");