From 309952ee8d533c72d1e9a8ee27d806bea02019dd Mon Sep 17 00:00:00 2001 From: Vidyakumar Athota Date: Thu, 27 Apr 2017 22:09:11 -0700 Subject: [PATCH] tinyalsa: add mixer_read() api to read event information Add mixer_read() API to get the event information. --- git/src/mixer.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tinyalsa-git/src/mixer.c b/tinyalsa-git/src/mixer.c index 0e48c6f..f1b5a30 100644 --- a/tinyalsa-git/src/mixer.c +++ b/tinyalsa-git/src/mixer.c @@ -963,3 +963,23 @@ int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string) return -EINVAL; } +/** Read the event information of the mixer control + * @param mixer An initialized mixer handle. + * @param event pointer to copy the data. + * @returns On success, zero. + * -1 on failure. + * @ingroup libtinyalsa-mixer + */ +int mixer_read(struct mixer *mixer, struct snd_ctl_event *event) +{ + int ret; + + if (!mixer || !event) + return -EINVAL; + + ret = read(mixer->fd, (char *)event, sizeof(struct snd_ctl_event)); + if (ret < 0) + ret = -errno; + + return ret; +} -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project