/*
* a note on stream states used:
* we use follwing states in the compressed core
* SNDRV_PCM_STATE_OPEN: When stream has been opened.
* SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
* calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
* state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
* SNDRV_PCM_STATE_RUNNING: When stream has been started and is
* decoding/encoding and rendering/capturing data.
* SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
* by calling SNDRV_COMPRESS_DRAIN.
* SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
* SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
* SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
*/
static int snd_compr_open(struct inode *inode, struct file *f)
{
struct snd_compr *compr;
struct snd_compr_file *data;
struct snd_compr_runtime *runtime;
enum snd_compr_direction dirn;
int maj = imajor(inode);
int ret;
if ((f->f_flags & O_ACCMODE) == O_WRONLY)
dirn = SND_COMPRESS_PLAYBACK;
else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
dirn = SND_COMPRESS_CAPTURE;
else
return -EINVAL;
if (maj == snd_major)
compr = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_COMPRESS);
else
return -EBADFD;
if (compr == NULL) {
pr_err("no device data!!!\n");
return -ENODEV;
}
if (dirn != compr->direction) {
pr_err("this device doesn't support this direction\n");
snd_card_unref(compr->card);
return -EINVAL;
}
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
snd_card_unref(compr->card);
return -ENOMEM;
}
data->stream.ops = compr->ops;
data->stream.direction = dirn;
data->stream.private_data = compr->private_data;
data->stream.device = compr;
runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
if (!runtime) {
kfree(data);
snd_card_unref(compr->card);
return -ENOMEM;
}
runtime->state = SNDRV_PCM_STATE_OPEN;
init_waitqueue_head(&runtime->sleep);
data->stream.runtime = runtime;
f->private_data = (void *)data;
mutex_lock(&compr->lock);
ret = compr->ops->open(&data->stream);
mutex_unlock(&compr->lock);
if (ret) {
kfree(runtime);
kfree(data);
}
snd_card_unref(compr->card);
return ret;
}
static int snd_hwdep_open(struct inode *inode, struct file * file)
{
int major = imajor(inode);
struct snd_hwdep *hw;
int err;
wait_queue_t wait;
if (major == snd_major) {
hw = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_HWDEP);
#ifdef CONFIG_SND_OSSEMUL
} else if (major == SOUND_MAJOR) {
hw = snd_lookup_oss_minor_data(iminor(inode),
SNDRV_OSS_DEVICE_TYPE_DMFM);
#endif
} else
return -ENXIO;
if (hw == NULL)
return -ENODEV;
if (!try_module_get(hw->card->module)) {
snd_card_unref(hw->card);
return -EFAULT;
}
init_waitqueue_entry(&wait, current);
add_wait_queue(&hw->open_wait, &wait);
mutex_lock(&hw->open_mutex);
while (1) {
if (hw->exclusive && hw->used > 0) {
err = -EBUSY;
break;
}
if (!hw->ops.open) {
err = 0;
break;
}
err = hw->ops.open(hw, file);
if (err >= 0)
break;
if (err == -EAGAIN) {
if (file->f_flags & O_NONBLOCK) {
err = -EBUSY;
break;
}
} else
break;
set_current_state(TASK_INTERRUPTIBLE);
mutex_unlock(&hw->open_mutex);
schedule();
mutex_lock(&hw->open_mutex);
if (hw->card->shutdown) {
err = -ENODEV;
break;
}
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
}
remove_wait_queue(&hw->open_wait, &wait);
if (err >= 0) {
err = snd_card_file_add(hw->card, file);
if (err >= 0) {
file->private_data = hw;
hw->used++;
} else {
if (hw->ops.release)
hw->ops.release(hw, file);
}
}
mutex_unlock(&hw->open_mutex);
if (err < 0)
module_put(hw->card->module);
snd_card_unref(hw->card);
return err;
}
