drivers/staging/media/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  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/delay.h>
  23 #include <linux/sched.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/time.h>
  26 #include <linux/mm.h>
  27 #include <linux/i2c.h>
  28 #include <linux/mutex.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/slab.h>
  31 #include <sound/core.h>
  32 #include <sound/pcm.h>
  33 #include <sound/initval.h>
  34
  35 #include "go7007-priv.h"
  36
  37 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  38 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  39 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  40
  41 module_param_array(index, int, NULL, 0444);
  42 module_param_array(id, charp, NULL, 0444);
  43 module_param_array(enable, bool, NULL, 0444);
  44 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
  45 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
  46 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
  47
  48 struct go7007_snd {
  49         struct snd_card *card;
  50         struct snd_pcm *pcm;
  51         struct snd_pcm_substream *substream;
  52         spinlock_t lock;
  53         int w_idx;
  54         int hw_ptr;
  55         int avail;
  56         int capturing;
  57 };
  58
  59 static struct snd_pcm_hardware go7007_snd_capture_hw = {
  60         .info                   = (SNDRV_PCM_INFO_MMAP |
  61                                         SNDRV_PCM_INFO_INTERLEAVED |
  62                                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
  63                                         SNDRV_PCM_INFO_MMAP_VALID),
  64         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  65         .rates                  = SNDRV_PCM_RATE_48000,
  66         .rate_min               = 48000,
  67         .rate_max               = 48000,
  68         .channels_min           = 2,
  69         .channels_max           = 2,
  70         .buffer_bytes_max       = (128*1024),
  71         .period_bytes_min       = 4096,
  72         .period_bytes_max       = (128*1024),
  73         .periods_min            = 1,
  74         .periods_max            = 32,
  75 };
  76
  77 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
  78 {
  79         struct go7007_snd *gosnd = go->snd_context;
  80         struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
  81         int frames = bytes_to_frames(runtime, length);
  82
  83         spin_lock(&gosnd->lock);
  84         gosnd->hw_ptr += frames;
  85         if (gosnd->hw_ptr >= runtime->buffer_size)
  86                 gosnd->hw_ptr -= runtime->buffer_size;
  87         gosnd->avail += frames;
  88         spin_unlock(&gosnd->lock);
  89         if (gosnd->w_idx + length > runtime->dma_bytes) {
  90                 int cpy = runtime->dma_bytes - gosnd->w_idx;
  91
  92                 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
  93                 length -= cpy;
  94                 buf += cpy;
  95                 gosnd->w_idx = 0;
  96         }
  97         memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
  98         gosnd->w_idx += length;
  99         spin_lock(&gosnd->lock);
 100         if (gosnd->avail < runtime->period_size) {
 101                 spin_unlock(&gosnd->lock);
 102                 return;
 103         }
 104         gosnd->avail -= runtime->period_size;
 105         spin_unlock(&gosnd->lock);
 106         if (gosnd->capturing)
 107                 snd_pcm_period_elapsed(gosnd->substream);
 108 }
 109
 110 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
 111                                 struct snd_pcm_hw_params *hw_params)
 112 {
 113         struct go7007 *go = snd_pcm_substream_chip(substream);
 114         unsigned int bytes;
 115
 116         bytes = params_buffer_bytes(hw_params);
 117         if (substream->runtime->dma_bytes > 0)
 118                 vfree(substream->runtime->dma_area);
 119         substream->runtime->dma_bytes = 0;
 120         substream->runtime->dma_area = vmalloc(bytes);
 121         if (substream->runtime->dma_area == NULL)
 122                 return -ENOMEM;
 123         substream->runtime->dma_bytes = bytes;
 124         go->audio_deliver = parse_audio_stream_data;
 125         return 0;
 126 }
 127
 128 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
 129 {
 130         struct go7007 *go = snd_pcm_substream_chip(substream);
 131
 132         go->audio_deliver = NULL;
 133         if (substream->runtime->dma_bytes > 0)
 134                 vfree(substream->runtime->dma_area);
 135         substream->runtime->dma_bytes = 0;
 136         return 0;
 137 }
 138
 139 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
 140 {
 141         struct go7007 *go = snd_pcm_substream_chip(substream);
 142         struct go7007_snd *gosnd = go->snd_context;
 143         unsigned long flags;
 144         int r;
 145
 146         spin_lock_irqsave(&gosnd->lock, flags);
 147         if (gosnd->substream == NULL) {
 148                 gosnd->substream = substream;
 149                 substream->runtime->hw = go7007_snd_capture_hw;
 150                 r = 0;
 151         } else
 152                 r = -EBUSY;
 153         spin_unlock_irqrestore(&gosnd->lock, flags);
 154         return r;
 155 }
 156
 157 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
 158 {
 159         struct go7007 *go = snd_pcm_substream_chip(substream);
 160         struct go7007_snd *gosnd = go->snd_context;
 161
 162         gosnd->substream = NULL;
 163         return 0;
 164 }
 165
 166 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
 167 {
 168         return 0;
 169 }
 170
 171 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 172 {
 173         struct go7007 *go = snd_pcm_substream_chip(substream);
 174         struct go7007_snd *gosnd = go->snd_context;
 175
 176         switch (cmd) {
 177         case SNDRV_PCM_TRIGGER_START:
 178                 /* Just set a flag to indicate we should signal ALSA when
 179                  * sound comes in */
 180                 gosnd->capturing = 1;
 181                 return 0;
 182         case SNDRV_PCM_TRIGGER_STOP:
 183                 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 184                 gosnd->capturing = 0;
 185                 return 0;
 186         default:
 187                 return -EINVAL;
 188         }
 189 }
 190
 191 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
 192 {
 193         struct go7007 *go = snd_pcm_substream_chip(substream);
 194         struct go7007_snd *gosnd = go->snd_context;
 195
 196         return gosnd->hw_ptr;
 197 }
 198
 199 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
 200                                         unsigned long offset)
 201 {
 202         return vmalloc_to_page(substream->runtime->dma_area + offset);
 203 }
 204
 205 static struct snd_pcm_ops go7007_snd_capture_ops = {
 206         .open           = go7007_snd_capture_open,
 207         .close          = go7007_snd_capture_close,
 208         .ioctl          = snd_pcm_lib_ioctl,
 209         .hw_params      = go7007_snd_hw_params,
 210         .hw_free        = go7007_snd_hw_free,
 211         .prepare        = go7007_snd_pcm_prepare,
 212         .trigger        = go7007_snd_pcm_trigger,
 213         .pointer        = go7007_snd_pcm_pointer,
 214         .page           = go7007_snd_pcm_page,
 215 };
 216
 217 static int go7007_snd_free(struct snd_device *device)
 218 {
 219         struct go7007 *go = device->device_data;
 220
 221         kfree(go->snd_context);
 222         go->snd_context = NULL;
 223         return 0;
 224 }
 225
 226 static struct snd_device_ops go7007_snd_device_ops = {
 227         .dev_free       = go7007_snd_free,
 228 };
 229
 230 int go7007_snd_init(struct go7007 *go)
 231 {
 232         static int dev;
 233         struct go7007_snd *gosnd;
 234         int ret = 0;
 235
 236         if (dev >= SNDRV_CARDS)
 237                 return -ENODEV;
 238         if (!enable[dev]) {
 239                 dev++;
 240                 return -ENOENT;
 241         }
 242         gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
 243         if (gosnd == NULL)
 244                 return -ENOMEM;
 245         spin_lock_init(&gosnd->lock);
 246         gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 247         gosnd->capturing = 0;
 248         ret = snd_card_create(index[dev], id[dev], THIS_MODULE, 0,
 249                               &gosnd->card);
 250         if (ret < 0) {
 251                 kfree(gosnd);
 252                 return ret;
 253         }
 254         ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
 255                         &go7007_snd_device_ops);
 256         if (ret < 0) {
 257                 kfree(gosnd);
 258                 return ret;
 259         }
 260         snd_card_set_dev(gosnd->card, go->dev);
 261         ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
 262         if (ret < 0) {
 263                 snd_card_free(gosnd->card);
 264                 kfree(gosnd);
 265                 return ret;
 266         }
 267         strlcpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
 268         strlcpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
 269         strlcpy(gosnd->card->longname, gosnd->card->shortname,
 270                         sizeof(gosnd->card->longname));
 271
 272         gosnd->pcm->private_data = go;
 273         snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
 274                         &go7007_snd_capture_ops);
 275
 276         ret = snd_card_register(gosnd->card);
 277         if (ret < 0) {
 278                 snd_card_free(gosnd->card);
 279                 kfree(gosnd);
 280                 return ret;
 281         }
 282
 283         gosnd->substream = NULL;
 284         go->snd_context = gosnd;
 285         v4l2_device_get(&go->v4l2_dev);
 286         ++dev;
 287
 288         return 0;
 289 }
 290 EXPORT_SYMBOL(go7007_snd_init);
 291
 292 int go7007_snd_remove(struct go7007 *go)
 293 {
 294         struct go7007_snd *gosnd = go->snd_context;
 295
 296         snd_card_disconnect(gosnd->card);
 297         snd_card_free_when_closed(gosnd->card);
 298         v4l2_device_put(&go->v4l2_dev);
 299         return 0;
 300 }
 301 EXPORT_SYMBOL(go7007_snd_remove);
 302
 303 MODULE_LICENSE("GPL v2");