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