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| author |   Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2018-11-23 13:13:04 +0900 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2018-11-23 15:31:10 +0100 |
| commit | 90e8ac5c9d446124a5b43a6f135bf67e060c0c9d (patch) | |
| tree | e2d794e24286fb5df93e98c3ae1772ed662d57d0 /include/uapi/sound | |
| parent | ALSA: firewire-tascam: pick up data of state from tx isochronous pakcets (diff) | |
| download | linux-dev-90e8ac5c9d446124a5b43a6f135bf67e060c0c9d.tar.xz linux-dev-90e8ac5c9d446124a5b43a6f135bf67e060c0c9d.zip | |
ALSA: firewire-tascam: add new hwdep ioctl command to get state image
In a previous commit, ALSA firewire-tascam driver stores state image
from tx isochronous packets. This image includes states of knob, fader,
button of control surface, level of gain/volume of each physical
inputs/outputs, and so on. It's useful for userspace applications to
read whole of the image.
This commit adds a unique ioctl command for ALSA hwdep interface for the
purpose. For actual meaning of each bits in this image, please refer to
discussion in alsa-devel[1].
[1] http://mailman.alsa-project.org/pipermail/alsa-devel/2018-October/140785.html
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/uapi/sound')
| -rw-r--r-- | include/uapi/sound/firewire.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h index b9bc4bb1756b..012f81bf4750 100644 --- a/include/uapi/sound/firewire.h +++ b/include/uapi/sound/firewire.h @@ -66,6 +66,7 @@ union snd_firewire_event { #define SNDRV_FIREWIRE_IOCTL_GET_INFO _IOR('H', 0xf8, struct snd_firewire_get_info) #define SNDRV_FIREWIRE_IOCTL_LOCK _IO('H', 0xf9) #define SNDRV_FIREWIRE_IOCTL_UNLOCK _IO('H', 0xfa) +#define SNDRV_FIREWIRE_IOCTL_TASCAM_STATE _IOR('H', 0xfb, struct snd_firewire_tascam_state) #define SNDRV_FIREWIRE_TYPE_DICE 1 #define SNDRV_FIREWIRE_TYPE_FIREWORKS 2 @@ -90,4 +91,8 @@ struct snd_firewire_get_info { #define SNDRV_FIREWIRE_TASCAM_STATE_COUNT 64 +struct snd_firewire_tascam_state { + __be32 data[SNDRV_FIREWIRE_TASCAM_STATE_COUNT]; +}; + #endif /* _UAPI_SOUND_FIREWIRE_H_INCLUDED */ |