Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit bdf9804a authored by Sudheer Papothi's avatar Sudheer Papothi Committed by Gerrit - the friendly Code Review server
Browse files

SoC: soundwire: Add support for device wakeup 



Add soundwire API to wakeup soundwire master and slave devices.
These APIs will be used by slave driver to vote and unvote for
master wakeup, when it requires master for register access
operations. Master will be aware of the slave usage with the
vote for device wakeup.

Change-Id: Ifa93f35ab2cffba778cd2fd9a2461e5a58445b75
Signed-off-by: default avatarSudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: default avatarRamprasad Katkam <katkam@codeaurora.org>
parent c9755e1c

include/soc/soundwire.h

+6 −0
Original line number Diff line number Diff line
@@ -174,6 +174,8 @@ struct swr_master { 
				u8 *dev_num);

	int (*slvdev_datapath_control)(struct swr_master *mstr, bool enable);

	bool (*remove_from_group)(struct swr_master *mstr);

	void (*device_wakeup_vote)(struct swr_master *mstr);

	void (*device_wakeup_unvote)(struct swr_master *mstr);

	u16 port_en_mask;



};
@@ -341,4 +343,8 @@ extern void swr_remove_device(struct swr_device *swr_dev); 


extern struct swr_device *get_matching_swr_slave_device(struct device_node *np);



extern int swr_device_wakeup_vote(struct swr_device *dev);



extern int swr_device_wakeup_unvote(struct swr_device *dev);



#endif /* _LINUX_SOUNDWIRE_H */

soc/soundwire.c

+55 −0
Original line number Diff line number Diff line
@@ -489,6 +489,61 @@ int swr_get_logical_dev_num(struct swr_device *dev, u64 dev_id, 
}

EXPORT_SYMBOL(swr_get_logical_dev_num);



/**

 * swr_device_wakeup_vote - Wakeup master and slave devices from clock stop

 * @dev: pointer to soundwire slave device

 *

 * This API will wake up soundwire master and slave device(s) from

 * clock stop.

 */

int swr_device_wakeup_vote(struct swr_device *dev)

{

	int ret = 0;

	struct swr_master *master = dev->master;



	if (!master) {

		pr_err("%s: Master is NULL\n", __func__);

		return -EINVAL;

	}

	mutex_lock(&master->mlock);

	if (master->device_wakeup_vote)

		master->device_wakeup_vote(master);

	else

		ret = -EINVAL;

	mutex_unlock(&master->mlock);



	return ret;

}

EXPORT_SYMBOL(swr_device_wakeup_vote);



/**

 * swr_device_wakeup_unvote - Unvote Wakeup so that master and slave

 * devices can go back to  clock stop

 * @dev: pointer to soundwire slave device

 *

 * This API will remove vote for wakeup so that soundwire master and

 * slave device(s) can go back to clock stop.

 */

int swr_device_wakeup_unvote(struct swr_device *dev)

{

	int ret = 0;

	struct swr_master *master = dev->master;



	if (!master) {

		pr_err("%s: Master is NULL\n", __func__);

		return -EINVAL;

	}

	mutex_lock(&master->mlock);

	if (master->device_wakeup_unvote)

		master->device_wakeup_unvote(master);

	else

		ret = -EINVAL;

	mutex_unlock(&master->mlock);



	return ret;

}

EXPORT_SYMBOL(swr_device_wakeup_unvote);



/**

 * swr_read - read soundwire slave device registers

 * @dev: pointer to soundwire slave device