@@ -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 */
@@ -123,6 +123,14 @@ static int hwdep_unlock(struct snd_tscm *tscm)
return err;
}
+static int tscm_hwdep_state(struct snd_tscm *tscm, void __user *arg)
+{
+ if (copy_to_user(arg, tscm->state, sizeof(tscm->state)))
+ return -EFAULT;
+
+ return 0;
+}
+
static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_tscm *tscm = hwdep->private_data;
@@ -147,6 +155,8 @@ static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
return hwdep_lock(tscm);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(tscm);
+ case SNDRV_FIREWIRE_IOCTL_TASCAM_STATE:
+ return tscm_hwdep_state(tscm, (void __user *)arg);
default:
return -ENOIOCTLCMD;
}
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> --- include/uapi/sound/firewire.h | 5 +++++ sound/firewire/tascam/tascam-hwdep.c | 10 ++++++++++ 2 files changed, 15 insertions(+)