diff options
| author | Clemens Ladisch <clemens@ladisch.de> | 2005-11-20 14:06:59 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-01-03 12:29:17 +0100 |
| commit | f87135f56cb266e031f5ec081dfbde7e43f55e80 (patch) | |
| tree | c048abae6bb04df53f5d8d7dcffbf2c28bc638ff /sound/core/pcm_native.c | |
| parent | 6983b7240cd229787c3ee00e663ea94ea649d96a (diff) | |
| download | linux-f87135f56cb266e031f5ec081dfbde7e43f55e80.tar.bz2 | |
[ALSA] dynamic minors (3/6): store device-specific object pointers dynamically
Instead of storing the pointers to the device-specific structures in an
array, put them into the struct snd_minor, and look them up dynamically.
This makes the device type modules independent of the minor number
encoding.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'sound/core/pcm_native.c')
| -rw-r--r-- | sound/core/pcm_native.c | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index bb40c016135e..9010306bcead 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -62,6 +62,7 @@ static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams); static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams); +static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); /* * @@ -1554,7 +1555,8 @@ static struct file *snd_pcm_file_fd(int fd) { struct file *file; struct inode *inode; - unsigned short minor; + unsigned int minor; + file = fget(fd); if (!file) return NULL; @@ -1565,8 +1567,8 @@ static struct file *snd_pcm_file_fd(int fd) return NULL; } minor = iminor(inode); - if (minor >= 256 || - minor % SNDRV_MINOR_DEVICES < SNDRV_MINOR_PCM_PLAYBACK) { + if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && + !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { fput(file); return NULL; } @@ -2071,18 +2073,30 @@ static int snd_pcm_open_file(struct file *file, return 0; } -static int snd_pcm_open(struct inode *inode, struct file *file) +static int snd_pcm_playback_open(struct inode *inode, struct file *file) +{ + struct snd_pcm *pcm; + + pcm = snd_lookup_minor_data(iminor(inode), + SNDRV_DEVICE_TYPE_PCM_PLAYBACK); + return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); +} + +static int snd_pcm_capture_open(struct inode *inode, struct file *file) { - int cardnum = SNDRV_MINOR_CARD(iminor(inode)); - int device = SNDRV_MINOR_DEVICE(iminor(inode)); - int err; struct snd_pcm *pcm; + + pcm = snd_lookup_minor_data(iminor(inode), + SNDRV_DEVICE_TYPE_PCM_CAPTURE); + return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); +} + +static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) +{ + int err; struct snd_pcm_file *pcm_file; wait_queue_t wait; - if (device < SNDRV_MINOR_PCM_PLAYBACK || device >= SNDRV_MINOR_DEVICES) - return -ENXIO; - pcm = snd_pcm_devices[(cardnum * SNDRV_PCM_DEVICES) + (device % SNDRV_MINOR_PCMS)]; if (pcm == NULL) { err = -ENODEV; goto __error1; @@ -2098,7 +2112,7 @@ static int snd_pcm_open(struct inode *inode, struct file *file) add_wait_queue(&pcm->open_wait, &wait); down(&pcm->open_mutex); while (1) { - err = snd_pcm_open_file(file, pcm, device >= SNDRV_MINOR_PCM_CAPTURE ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, &pcm_file); + err = snd_pcm_open_file(file, pcm, stream, &pcm_file); if (err >= 0) break; if (err == -EAGAIN) { @@ -3375,7 +3389,7 @@ struct file_operations snd_pcm_f_ops[2] = { .owner = THIS_MODULE, .write = snd_pcm_write, .writev = snd_pcm_writev, - .open = snd_pcm_open, + .open = snd_pcm_playback_open, .release = snd_pcm_release, .poll = snd_pcm_playback_poll, .unlocked_ioctl = snd_pcm_playback_ioctl, @@ -3387,7 +3401,7 @@ struct file_operations snd_pcm_f_ops[2] = { .owner = THIS_MODULE, .read = snd_pcm_read, .readv = snd_pcm_readv, - .open = snd_pcm_open, + .open = snd_pcm_capture_open, .release = snd_pcm_release, .poll = snd_pcm_capture_poll, .unlocked_ioctl = snd_pcm_capture_ioctl, |