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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2015-02-13 15:14:05 -0600
committerTakashi Iwai <tiwai@suse.de>2015-02-20 17:30:05 +0100
commit5442a73a009231598fb5ea065c4e3f9daa30d8cc (patch)
treed6341aded1296eec7e0434433de04c5f5fc88355 /sound/core
parent38ca2a4d58bbc45973ee5cd14e4b803ee5ad69f0 (diff)
ALSA: core: pass audio tstamp config from userspace in compat mode
Let userspace select audio timestamp config, ignore and zero all other fields Use audio_tstamp_data to retrieve config and pass report back to user space Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_compat.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index 2d957ba63557..b48b434444ed 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -194,18 +194,30 @@ struct snd_pcm_status32 {
u32 avail_max;
u32 overrange;
s32 suspended_state;
- u32 reserved_alignment;
+ u32 audio_tstamp_data;
struct compat_timespec audio_tstamp;
- unsigned char reserved[56-sizeof(struct compat_timespec)];
+ struct compat_timespec driver_tstamp;
+ u32 audio_tstamp_accuracy;
+ unsigned char reserved[52-2*sizeof(struct compat_timespec)];
} __attribute__((packed));
static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
- struct snd_pcm_status32 __user *src)
+ struct snd_pcm_status32 __user *src,
+ bool ext)
{
struct snd_pcm_status status;
int err;
+ memset(&status, 0, sizeof(status));
+ /*
+ * with extension, parameters are read/write,
+ * get audio_tstamp_data from user,
+ * ignore rest of status structure
+ */
+ if (ext && get_user(status.audio_tstamp_data,
+ (u32 __user *)(&src->audio_tstamp_data)))
+ return -EFAULT;
err = snd_pcm_status(substream, &status);
if (err < 0)
return err;
@@ -222,7 +234,10 @@ static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
put_user(status.avail_max, &src->avail_max) ||
put_user(status.overrange, &src->overrange) ||
put_user(status.suspended_state, &src->suspended_state) ||
- compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp))
+ put_user(status.audio_tstamp_data, &src->audio_tstamp_data) ||
+ compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp) ||
+ compat_put_timespec(&status.driver_tstamp, &src->driver_tstamp) ||
+ put_user(status.audio_tstamp_accuracy, &src->audio_tstamp_accuracy))
return -EFAULT;
return err;
@@ -457,6 +472,7 @@ enum {
SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
+ SNDRV_PCM_IOCTL_STATUS_EXT32 = _IOWR('A', 0x24, struct snd_pcm_status32),
SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
@@ -517,7 +533,9 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
case SNDRV_PCM_IOCTL_SW_PARAMS32:
return snd_pcm_ioctl_sw_params_compat(substream, argp);
case SNDRV_PCM_IOCTL_STATUS32:
- return snd_pcm_status_user_compat(substream, argp);
+ return snd_pcm_status_user_compat(substream, argp, false);
+ case SNDRV_PCM_IOCTL_STATUS_EXT32:
+ return snd_pcm_status_user_compat(substream, argp, true);
case SNDRV_PCM_IOCTL_SYNC_PTR32:
return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
case SNDRV_PCM_IOCTL_CHANNEL_INFO32: