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control: add snd_ctl_elem_add_enumerated()

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Handling of user control elements was implemented for all types except
BYTES and ENUMERATED.  Enumerated user controls will be needed for the
device-specific mixers of upcoming FireWire drivers.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-10-07 22:46:51 +02:00
parent 567cc19a88
commit 15c6f83296
4 changed files with 84 additions and 2 deletions
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10
src/control/control_hw.c
View file

@ -148,6 +148,11 @@ static int snd_ctl_hw_elem_info(snd_ctl_t *handle, snd_ctl_elem_info_t *info)
static int snd_ctl_hw_elem_add(snd_ctl_t *handle, snd_ctl_elem_info_t *info)
{
snd_ctl_hw_t *hw = handle->private_data;
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED &&
hw->protocol < SNDRV_PROTOCOL_VERSION(2, 0, 7))
return -ENXIO;
if (ioctl(hw->fd, SNDRV_CTL_IOCTL_ELEM_ADD, info) < 0)
return -errno;
return 0;
@ -156,6 +161,11 @@ static int snd_ctl_hw_elem_add(snd_ctl_t *handle, snd_ctl_elem_info_t *info)
static int snd_ctl_hw_elem_replace(snd_ctl_t *handle, snd_ctl_elem_info_t *info)
{
snd_ctl_hw_t *hw = handle->private_data;
if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED &&
hw->protocol < SNDRV_PROTOCOL_VERSION(2, 0, 7))
return -ENXIO;
if (ioctl(hw->fd, SNDRV_CTL_IOCTL_ELEM_REPLACE, info) < 0)
return -errno;
return 0;