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soundwire: Add API to ungroup soundwire slave devices 

Add soundwire API to remove the soundwire slave devices
from group so that the devices can be controlled
independently as required.

CRs-fixed: 1007465
Change-Id: Ibca3e33c0e85629ae5ce121e75526f4786d6408a
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>
This commit is contained in:
Phani Kumar Uppalapati 2016-04-22 16:48:48 -07:00 committed by Gerrit - the friendly Code Review server
parent f28b6e365b
commit 8896b43482
2 changed files with 34 additions and 0 deletions
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32
drivers/soundwire/soundwire.c
View File

@ -239,6 +239,38 @@ void swr_port_response(struct swr_master *mstr, u8 tid)
}
EXPORT_SYMBOL(swr_port_response);
/**
* swr_remove_from_group - remove soundwire slave devices from group
* @dev: pointer to the soundwire slave device
* dev_num: device number of the soundwire slave device
*
* Returns error code for failure and 0 for success
*/
int swr_remove_from_group(struct swr_device *dev, u8 dev_num)
{
struct swr_master *master;
if (!dev)
return -ENODEV;
master = dev->master;
if (!master)
return -EINVAL;
if (!dev->group_id)
return 0;
if (master->gr_sid == dev_num)
return 0;
if (master->remove_from_group && master->remove_from_group(master))
dev_dbg(&master->dev, "%s: falling back to GROUP_NONE\n",
__func__);
return 0;
}
EXPORT_SYMBOL(swr_remove_from_group);
/**
* swr_slvdev_datapath_control - Enables/Disables soundwire slave device
* data path

2
include/linux/soundwire/soundwire.h
View File

@ -152,6 +152,7 @@ struct swr_master {
int (*get_logical_dev_num)(struct swr_master *mstr, u64 dev_id,
u8 *dev_num);
void (*slvdev_datapath_control)(struct swr_master *mstr, bool enable);
bool (*remove_from_group)(struct swr_master *mstr);
};
static inline struct swr_master *to_swr_master(struct device *dev)
@ -307,4 +308,5 @@ extern int swr_reset_device(struct swr_device *swr_dev);
extern int swr_slvdev_datapath_control(struct swr_device *swr_dev, u8 dev_num,
bool enable);
extern int swr_remove_from_group(struct swr_device *dev, u8 dev_num);
#endif /* _LINUX_SOUNDWIRE_H */