Commit 672825cd authored by Jack Chen's avatar Jack Chen Committed by Alexandre Belloni
Browse files

i3c: export SETDASA method 



Because not all I3C drivers have the hot-join feature ready, and
especially not all I3C devices support hot-join feature, exporting
SETDASA method could be useful. With this function, the I3C controller
could perform a DAA to I3C devices when users decide to turn these I3C
devices off and on again during run-time.

Tested: This change has been tested with turnning off an I3C device and
turning on it again during run-time. The device driver calls SETDASA
method to perform DAA to the device. And communication between I3C
controller and device is set up again correctly.

Signed-off-by: default avatarJack Chen <zenghuchen@google.com>
Link: https://lore.kernel.org/r/20221207205059.3848851-1-zenghuchen@google.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 01744ce9

drivers/i3c/device.c

+20 −0
Original line number Diff line number Diff line
@@ -50,6 +50,26 @@ int i3c_device_do_priv_xfers(struct i3c_device *dev, 
}

EXPORT_SYMBOL_GPL(i3c_device_do_priv_xfers);



/**

 * i3c_device_do_setdasa() - do I3C dynamic address assignement with

 *                           static address

 *

 * @dev: device with which the DAA should be done

 *

 * Return: 0 in case of success, a negative error core otherwise.

 */

int i3c_device_do_setdasa(struct i3c_device *dev)

{

	int ret;



	i3c_bus_normaluse_lock(dev->bus);

	ret = i3c_dev_setdasa_locked(dev->desc);

	i3c_bus_normaluse_unlock(dev->bus);



	return ret;

}

EXPORT_SYMBOL_GPL(i3c_device_do_setdasa);



/**

 * i3c_device_get_info() - get I3C device information

 *

drivers/i3c/internals.h

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ extern struct bus_type i3c_bus_type; 
void i3c_bus_normaluse_lock(struct i3c_bus *bus);

void i3c_bus_normaluse_unlock(struct i3c_bus *bus);



int i3c_dev_setdasa_locked(struct i3c_dev_desc *dev);

int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev,

				 struct i3c_priv_xfer *xfers,

				 int nxfers);

drivers/i3c/master.c

+19 −0
Original line number Diff line number Diff line
@@ -2708,6 +2708,25 @@ int i3c_master_unregister(struct i3c_master_controller *master) 
}

EXPORT_SYMBOL_GPL(i3c_master_unregister);



int i3c_dev_setdasa_locked(struct i3c_dev_desc *dev)

{

	struct i3c_master_controller *master;



	if (!dev)

		return -ENOENT;



	master = i3c_dev_get_master(dev);

	if (!master)

		return -EINVAL;



	if (!dev->boardinfo || !dev->boardinfo->init_dyn_addr ||

		!dev->boardinfo->static_addr)

		return -EINVAL;



	return i3c_master_setdasa_locked(master, dev->info.static_addr,

						dev->boardinfo->init_dyn_addr);

}



int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev,

				 struct i3c_priv_xfer *xfers,

				 int nxfers)

include/linux/i3c/device.h

+2 −0
Original line number Diff line number Diff line
@@ -294,6 +294,8 @@ int i3c_device_do_priv_xfers(struct i3c_device *dev, 
			     struct i3c_priv_xfer *xfers,

			     int nxfers);



int i3c_device_do_setdasa(struct i3c_device *dev);



void i3c_device_get_info(struct i3c_device *dev, struct i3c_device_info *info);



struct i3c_ibi_payload {