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mixer: Add support for TLV RW access check api

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Tinyalsa doesn't expose an api to check TLV RW access

Add mixer_ctl_is_access_tlv_rw().

This api will get used by tinymix and audio HALs for checking TLV RW
access before managing the byte related mixer controls.

Change-Id: Ib5707fabf479de638e1c7abd4cd149e7637ff9c2
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
This commit is contained in:
Pankaj Bharadiya
2017-01-09 12:23:14 +05:30
parent c848ea519f
commit 9698d03a63
2 changed files with 15 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/tinyalsa/mixer.h
+2
View File
@@ -107,6 +107,8 @@ const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_i
*/
void mixer_ctl_update(struct mixer_ctl *ctl);
int mixer_ctl_is_access_tlv_rw(const struct mixer_ctl *ctl);
/* Set and get mixer controls */
int mixer_ctl_get_percent(const struct mixer_ctl *ctl, unsigned int id);
src/mixer.c
+13 -2
View File
@@ -381,6 +381,17 @@ void mixer_ctl_update(struct mixer_ctl *ctl)
ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_INFO, ctl->info);
}
/** Checks the control for TLV Read/Write access.
* @param ctl An initialized control handle.
* @returns On success, non-zero.
* On failure, zero.
* @ingroup libtinyalsa-mixer
*/
int mixer_ctl_is_access_tlv_rw(const struct mixer_ctl *ctl)
{
return (ctl->info.access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE);
}
/** Gets the control's ID.
* @param ctl An initialized control handle.
* @returns On success, the control's ID is returned.
@@ -598,7 +609,7 @@ int mixer_ctl_get_array(const struct mixer_ctl *ctl, void *array, size_t count)
case SNDRV_CTL_ELEM_TYPE_BYTES:
/* check if this is new bytes TLV */
if (ctl->info.access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
if (mixer_ctl_is_access_tlv_rw(ctl)) {
struct snd_ctl_tlv *tlv;
int ret;
@@ -719,7 +730,7 @@ int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count)
case SNDRV_CTL_ELEM_TYPE_BYTES:
/* check if this is new bytes TLV */
if (ctl->info.access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
if (mixer_ctl_is_access_tlv_rw(ctl)) {
struct snd_ctl_tlv *tlv;
int ret = 0;
if (count > SIZE_MAX - sizeof(*tlv))