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ALSA: core: Handle user defined ioctls

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Handle ioctl magic 'U' as an user defined ioctl so that ALSA core calls
substream's ioctl handler.  This gets rid of a requirement that ALSA core
needs to be changed every time when a new user defined ioctl is introduced.

Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
This commit is contained in:
Sudheer Papothi 2016-02-24 00:32:16 +05:30 • committed by David Keitel
parent 74e78b3452
commit eb4032ed5c
1 changed files with 23 additions and 2 deletions
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25
sound/core/pcm_native.c
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@ -1090,6 +1090,20 @@ static int snd_compressed_ioctl(struct snd_pcm_substream *substream,
err = substream->ops->ioctl(substream, cmd, arg);
return err;
}
static int snd_user_ioctl(struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
struct snd_pcm_runtime *runtime;
int err = 0;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
err = substream->ops->ioctl(substream, cmd, arg);
return err;
}
/*
* stop callbacks
*/
@ -2832,6 +2846,9 @@ static int snd_pcm_common_ioctl1(struct file *file,
case SNDRV_COMPRESS_TSTAMP:
case SNDRV_COMPRESS_DRAIN:
return snd_compressed_ioctl(substream, cmd, arg);
default:
if (((cmd >> 8) & 0xff) == 'U')
return snd_user_ioctl(substream, cmd, arg);
}
pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
return -ENOTTY;
@ -3001,10 +3018,12 @@ static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_pcm_file *pcm_file;
unsigned char ioctl_magic;
pcm_file = file->private_data;
ioctl_magic = ((cmd >> 8) & 0xff);
if ((((cmd >> 8) & 0xff) != 'A') && (((cmd >> 8) & 0xff) != 'C'))
if (ioctl_magic != 'A' && ioctl_magic != 'C' && ioctl_magic != 'U')
return -ENOTTY;
return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
@ -3015,10 +3034,12 @@ static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_pcm_file *pcm_file;
unsigned char ioctl_magic;
pcm_file = file->private_data;
ioctl_magic = ((cmd >> 8) & 0xff);
if (((cmd >> 8) & 0xff) != 'A')
if (ioctl_magic != 'A' && ioctl_magic != 'U')
return -ENOTTY;
return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,