diff options
| author | Jack Chen <zenghuchen@google.com> | 2022-12-07 23:50:59 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2022-12-11 23:25:58 +0300 |
| commit | 672825cd2823a0cee4687ce80fef5b702ff3caa3 (patch) | |
| tree | da9b5a85074db5b7b58c626c9fd8463604f4c03e /drivers/i3c | |
| parent | 01744ce9f07f0b76b0b2d30adba2a7c104f1ff2a (diff) | |
| download | linux-672825cd2823a0cee4687ce80fef5b702ff3caa3.tar.xz | |
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>
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/device.c | 20 | ||||
| -rw-r--r-- | drivers/i3c/internals.h | 1 | ||||
| -rw-r--r-- | drivers/i3c/master.c | 19 |
3 files changed, 40 insertions, 0 deletions
diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c index e92d3e9a52bd..9762630b917e 100644 --- a/drivers/i3c/device.c +++ b/drivers/i3c/device.c @@ -51,6 +51,26 @@ 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 * * @dev: device we want information on diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h index 86b7b44cfca2..908a807badaf 100644 --- a/drivers/i3c/internals.h +++ b/drivers/i3c/internals.h @@ -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); diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 351c81a929a6..d7e6f6c99aea 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -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) |