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asoc: Expose a sysfs node to notify device open/close.

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Add support in kona machine driver to expose a sysfs node.
Userspace uses this sysfs node to notify machine driver
on which dai-link ( pcm id) is opened/closed. This information
regarding device open/close is then compared against shutdown/
startup dai_link ops. If there is a mismatch we conclude
that there has been a userspace service crash and we
issue a close all session command to dsp and also clear
all the dma buffers which were allocated by the service.

Change-Id: I4fc13adf8cc527c87b822a3b189d4ff081539a3c
Signed-off-by: Ashish Jain <ashishj@codeaurora.org>
This commit is contained in:
Ashish Jain
2019-09-12 09:26:46 +05:30
committed by Gerrit - the friendly Code Review server
parent 4adf995c01
commit de3e09d08d
6 changed files with 325 additions and 58 deletions
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4
asoc/msm_common.h
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@@ -32,6 +32,10 @@ enum {
};
struct msm_common_pdata {
uint8_t *aud_dev_state;
struct kobject aud_dev_kobj;
uint8_t dsp_sessions_closed;
uint32_t num_aud_devs;
struct device_node *mi2s_gpio_p[MI2S_TDM_AUXPCM_MAX];
struct mutex lock[MI2S_TDM_AUXPCM_MAX];
atomic_t mi2s_gpio_ref_cnt[MI2S_TDM_AUXPCM_MAX];