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| author | px4dev <px4@purgatory.org> | 2012-08-05 02:09:11 -0700 |
|---|---|---|
| committer | px4dev <px4@purgatory.org> | 2012-08-05 14:13:33 -0700 |
| commit | 9804776a0c8bd67d4a533e3302f1a598c35b868b (patch) | |
| tree | f91736f146ac44b3db2e94d3b8162bc168926963 /apps/drivers/drv_mixer.h | |
| parent | 145a6c4c49b1aac9a8b8065ac5e48ba50754ba7f (diff) | |
| download | px4-firmware-9804776a0c8bd67d4a533e3302f1a598c35b868b.tar.gz px4-firmware-9804776a0c8bd67d4a533e3302f1a598c35b868b.tar.bz2 px4-firmware-9804776a0c8bd67d4a533e3302f1a598c35b868b.zip | |
Checkpoint: more work in progress on mixer load/save
Diffstat (limited to 'apps/drivers/drv_mixer.h')
| -rw-r--r-- | apps/drivers/drv_mixer.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/apps/drivers/drv_mixer.h b/apps/drivers/drv_mixer.h index 10cda792a..f3a39e60c 100644 --- a/apps/drivers/drv_mixer.h +++ b/apps/drivers/drv_mixer.h @@ -80,11 +80,15 @@ struct MixInfo * is allocated following the MixInfo structure. If the allocation * is too small, no mixer data is retured. The control_count field in * the MixInfo.mixer structure is always updated. + * + * If no mixer is assigned for the given index, the ioctl returns ENOENT. */ #define MIXERIOCGETMIXER(_mixer) _MIXERIOC(0x20 + _mixer) /** * Copy a mixer from *(struct MixMixer *)arg to the device. + * + * If arg is zero, the mixer is deleted. */ #define MIXERIOCSETMIXER(_mixer) _MIXERIOC(0x40 + _mixer) |