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/init.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/delay.h>
  24 #include <linux/sched.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/time.h>
  27 #include <linux/mm.h>
  28 #include <linux/i2c.h>
  29 #include <linux/mutex.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/slab.h>
  32 #include <asm/system.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/initval.h>
  36
  37 #include "go7007-priv.h"
  38
  39 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  40 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  41 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  42
  43 module_param_array(index, int, NULL, 0444);
  44 module_param_array(id, charp, NULL, 0444);
  45 module_param_array(enable, bool, NULL, 0444);
  46 MODULE_PARM_DESC(index, "Index value for the go7007 audio driver");
  47 MODULE_PARM_DESC(id, "ID string for the go7007 audio driver");
  48 MODULE_PARM_DESC(enable, "Enable for the go7007 audio driver");
  49
  50 struct go7007_snd {
  51         struct snd_card *card;
  52         struct snd_pcm *pcm;
  53         struct snd_pcm_substream *substream;
  54         spinlock_t lock;
  55         int w_idx;
  56         int hw_ptr;
  57         int avail;
  58         int capturing;
  59 };
  60
  61 static struct snd_pcm_hardware go7007_snd_capture_hw = {
  62         .info                   = (SNDRV_PCM_INFO_MMAP |
  63                                         SNDRV_PCM_INFO_INTERLEAVED |
  64                                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
  65                                         SNDRV_PCM_INFO_MMAP_VALID),
  66         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  67         .rates                  = SNDRV_PCM_RATE_48000,
  68         .rate_min               = 48000,
  69         .rate_max               = 48000,
  70         .channels_min           = 2,
  71         .channels_max           = 2,
  72         .buffer_bytes_max       = (128*1024),
  73         .period_bytes_min       = 4096,
  74         .period_bytes_max       = (128*1024),
  75         .periods_min            = 1,
  76         .periods_max            = 32,
  77 };
  78
  79 static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
  80 {
  81         struct go7007_snd *gosnd = go->snd_context;
  82         struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
  83         int frames = bytes_to_frames(runtime, length);
  84
  85         spin_lock(&gosnd->lock);
  86         gosnd->hw_ptr += frames;
  87         if (gosnd->hw_ptr >= runtime->buffer_size)
  88                 gosnd->hw_ptr -= runtime->buffer_size;
  89         gosnd->avail += frames;
  90         spin_unlock(&gosnd->lock);
  91         if (gosnd->w_idx + length > runtime->dma_bytes) {
  92                 int cpy = runtime->dma_bytes - gosnd->w_idx;
  93
  94                 memcpy(runtime->dma_area + gosnd->w_idx, buf, cpy);
  95                 length -= cpy;
  96                 buf += cpy;
  97                 gosnd->w_idx = 0;
  98         }
  99         memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
 100         gosnd->w_idx += length;
 101         spin_lock(&gosnd->lock);
 102         if (gosnd->avail < runtime->period_size) {
 103                 spin_unlock(&gosnd->lock);
 104                 return;
 105         }
 106         gosnd->avail -= runtime->period_size;
 107         spin_unlock(&gosnd->lock);
 108         if (gosnd->capturing)
 109                 snd_pcm_period_elapsed(gosnd->substream);
 110 }
 111
 112 static int go7007_snd_hw_params(struct snd_pcm_substream *substream,
 113                                 struct snd_pcm_hw_params *hw_params)
 114 {
 115         struct go7007 *go = snd_pcm_substream_chip(substream);
 116         unsigned int bytes;
 117
 118         bytes = params_buffer_bytes(hw_params);
 119         if (substream->runtime->dma_bytes > 0)
 120                 vfree(substream->runtime->dma_area);
 121         substream->runtime->dma_bytes = 0;
 122         substream->runtime->dma_area = vmalloc(bytes);
 123         if (substream->runtime->dma_area == NULL)
 124                 return -ENOMEM;
 125         substream->runtime->dma_bytes = bytes;
 126         go->audio_deliver = parse_audio_stream_data;
 127         return 0;
 128 }
 129
 130 static int go7007_snd_hw_free(struct snd_pcm_substream *substream)
 131 {
 132         struct go7007 *go = snd_pcm_substream_chip(substream);
 133
 134         go->audio_deliver = NULL;
 135         if (substream->runtime->dma_bytes > 0)
 136                 vfree(substream->runtime->dma_area);
 137         substream->runtime->dma_bytes = 0;
 138         return 0;
 139 }
 140
 141 static int go7007_snd_capture_open(struct snd_pcm_substream *substream)
 142 {
 143         struct go7007 *go = snd_pcm_substream_chip(substream);
 144         struct go7007_snd *gosnd = go->snd_context;
 145         unsigned long flags;
 146         int r;
 147
 148         spin_lock_irqsave(&gosnd->lock, flags);
 149         if (gosnd->substream == NULL) {
 150                 gosnd->substream = substream;
 151                 substream->runtime->hw = go7007_snd_capture_hw;
 152                 r = 0;
 153         } else
 154                 r = -EBUSY;
 155         spin_unlock_irqrestore(&gosnd->lock, flags);
 156         return r;
 157 }
 158
 159 static int go7007_snd_capture_close(struct snd_pcm_substream *substream)
 160 {
 161         struct go7007 *go = snd_pcm_substream_chip(substream);
 162         struct go7007_snd *gosnd = go->snd_context;
 163
 164         gosnd->substream = NULL;
 165         return 0;
 166 }
 167
 168 static int go7007_snd_pcm_prepare(struct snd_pcm_substream *substream)
 169 {
 170         return 0;
 171 }
 172
 173 static int go7007_snd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 174 {
 175         struct go7007 *go = snd_pcm_substream_chip(substream);
 176         struct go7007_snd *gosnd = go->snd_context;
 177
 178         switch (cmd) {
 179         case SNDRV_PCM_TRIGGER_START:
 180                 /* Just set a flag to indicate we should signal ALSA when
 181                  * sound comes in */
 182                 gosnd->capturing = 1;
 183                 return 0;
 184         case SNDRV_PCM_TRIGGER_STOP:
 185                 gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 186                 gosnd->capturing = 0;
 187                 return 0;
 188         default:
 189                 return -EINVAL;
 190         }
 191 }
 192
 193 static snd_pcm_uframes_t go7007_snd_pcm_pointer(struct snd_pcm_substream *substream)
 194 {
 195         struct go7007 *go = snd_pcm_substream_chip(substream);
 196         struct go7007_snd *gosnd = go->snd_context;
 197
 198         return gosnd->hw_ptr;
 199 }
 200
 201 static struct page *go7007_snd_pcm_page(struct snd_pcm_substream *substream,
 202                                         unsigned long offset)
 203 {
 204         return vmalloc_to_page(substream->runtime->dma_area + offset);
 205 }
 206
 207 static struct snd_pcm_ops go7007_snd_capture_ops = {
 208         .open           = go7007_snd_capture_open,
 209         .close          = go7007_snd_capture_close,
 210         .ioctl          = snd_pcm_lib_ioctl,
 211         .hw_params      = go7007_snd_hw_params,
 212         .hw_free        = go7007_snd_hw_free,
 213         .prepare        = go7007_snd_pcm_prepare,
 214         .trigger        = go7007_snd_pcm_trigger,
 215         .pointer        = go7007_snd_pcm_pointer,
 216         .page           = go7007_snd_pcm_page,
 217 };
 218
 219 static int go7007_snd_free(struct snd_device *device)
 220 {
 221         struct go7007 *go = device->device_data;
 222
 223         kfree(go->snd_context);
 224         go->snd_context = NULL;
 225         if (--go->ref_count == 0)
 226                 kfree(go);
 227         return 0;
 228 }
 229
 230 static struct snd_device_ops go7007_snd_device_ops = {
 231         .dev_free       = go7007_snd_free,
 232 };
 233
 234 int go7007_snd_init(struct go7007 *go)
 235 {
 236         static int dev;
 237         struct go7007_snd *gosnd;
 238         int ret = 0;
 239
 240         if (dev >= SNDRV_CARDS)
 241                 return -ENODEV;
 242         if (!enable[dev]) {
 243                 dev++;
 244                 return -ENOENT;
 245         }
 246         gosnd = kmalloc(sizeof(struct go7007_snd), GFP_KERNEL);
 247         if (gosnd == NULL)
 248                 return -ENOMEM;
 249         spin_lock_init(&gosnd->lock);
 250         gosnd->hw_ptr = gosnd->w_idx = gosnd->avail = 0;
 251         gosnd->capturing = 0;
 252         ret = snd_card_create(index[dev], id[dev], THIS_MODULE, 0,
 253                               &gosnd->card);
 254         if (ret < 0) {
 255                 kfree(gosnd);
 256                 return ret;
 257         }
 258         ret = snd_device_new(gosnd->card, SNDRV_DEV_LOWLEVEL, go,
 259                         &go7007_snd_device_ops);
 260         if (ret < 0) {
 261                 kfree(gosnd);
 262                 return ret;
 263         }
 264         snd_card_set_dev(gosnd->card, go->dev);
 265         ret = snd_pcm_new(gosnd->card, "go7007", 0, 0, 1, &gosnd->pcm);
 266         if (ret < 0) {
 267                 snd_card_free(gosnd->card);
 268                 kfree(gosnd);
 269                 return ret;
 270         }
 271         strncpy(gosnd->card->driver, "go7007", sizeof(gosnd->card->driver));
 272         strncpy(gosnd->card->shortname, go->name, sizeof(gosnd->card->driver));
 273         strncpy(gosnd->card->longname, gosnd->card->shortname,
 274                         sizeof(gosnd->card->longname));
 275
 276         gosnd->pcm->private_data = go;
 277         snd_pcm_set_ops(gosnd->pcm, SNDRV_PCM_STREAM_CAPTURE,
 278                         &go7007_snd_capture_ops);
 279
 280         ret = snd_card_register(gosnd->card);
 281         if (ret < 0) {
 282                 snd_card_free(gosnd->card);
 283                 kfree(gosnd);
 284                 return ret;
 285         }
 286
 287         gosnd->substream = NULL;
 288         go->snd_context = gosnd;
 289         ++dev;
 290         ++go->ref_count;
 291
 292         return 0;
 293 }
 294 EXPORT_SYMBOL(go7007_snd_init);
 295
 296 int go7007_snd_remove(struct go7007 *go)
 297 {
 298         struct go7007_snd *gosnd = go->snd_context;
 299
 300         snd_card_disconnect(gosnd->card);
 301         snd_card_free_when_closed(gosnd->card);
 302         return 0;
 303 }
 304 EXPORT_SYMBOL(go7007_snd_remove);
 305
 306 MODULE_LICENSE("GPL v2");