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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: Jack Chen <zenghuchen@google.com>
Link: https://lore.kernel.org/r/20221207205059.3848851-1-zenghuchen@google.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Jack Chen 2022-12-07 15:50:59 -05:00 committed by Alexandre Belloni
parent 01744ce9f0
commit 672825cd28
4 changed files with 42 additions and 0 deletions
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20
drivers/i3c/device.c
View File

@ -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
*

1
drivers/i3c/internals.h
View File

@ -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);

19
drivers/i3c/master.c
View File

@ -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)

2
include/linux/i3c/device.h
View File

@ -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 {