Commit 0ac6486e authored by Jeremy Kerr's avatar Jeremy Kerr Committed by Paolo Abeni
Browse files

i3c: Add support for bus enumeration & notification 



This allows other drivers to be notified when new i3c busses are
attached, referring to a whole i3c bus as opposed to individual
devices.

Signed-off-by: default avatarJeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: default avatarMatt Johnston <matt@codeconstruct.com.au>
Acked-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent ee71d6d5

drivers/i3c/master.c

+35 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
static DEFINE_IDR(i3c_bus_idr);

static DEFINE_MUTEX(i3c_core_lock);

static int __i3c_first_dynamic_bus_num;

static BLOCKING_NOTIFIER_HEAD(i3c_bus_notifier);



/**

 * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation
@@ -453,6 +454,36 @@ static int i3c_bus_init(struct i3c_bus *i3cbus, struct device_node *np) 
	return 0;

}



void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data),

			     void *data)

{

	struct i3c_bus *bus;

	int id;



	mutex_lock(&i3c_core_lock);

	idr_for_each_entry(&i3c_bus_idr, bus, id)

		fn(bus, data);

	mutex_unlock(&i3c_core_lock);

}

EXPORT_SYMBOL_GPL(i3c_for_each_bus_locked);



int i3c_register_notifier(struct notifier_block *nb)

{

	return blocking_notifier_chain_register(&i3c_bus_notifier, nb);

}

EXPORT_SYMBOL_GPL(i3c_register_notifier);



int i3c_unregister_notifier(struct notifier_block *nb)

{

	return blocking_notifier_chain_unregister(&i3c_bus_notifier, nb);

}

EXPORT_SYMBOL_GPL(i3c_unregister_notifier);



static void i3c_bus_notify(struct i3c_bus *bus, unsigned int action)

{

	blocking_notifier_call_chain(&i3c_bus_notifier, action, bus);

}



static const char * const i3c_bus_mode_strings[] = {

	[I3C_BUS_MODE_PURE] = "pure",

	[I3C_BUS_MODE_MIXED_FAST] = "mixed-fast",
@@ -2682,6 +2713,8 @@ int i3c_master_register(struct i3c_master_controller *master, 
	if (ret)

		goto err_del_dev;



	i3c_bus_notify(i3cbus, I3C_NOTIFY_BUS_ADD);



	/*

	 * We're done initializing the bus and the controller, we can now

	 * register I3C devices discovered during the initial DAA.
@@ -2714,6 +2747,8 @@ EXPORT_SYMBOL_GPL(i3c_master_register); 
 */

void i3c_master_unregister(struct i3c_master_controller *master)

{

	i3c_bus_notify(&master->bus, I3C_NOTIFY_BUS_REMOVE);



	i3c_master_i2c_adapter_cleanup(master);

	i3c_master_unregister_i3c_devs(master);

	i3c_master_bus_cleanup(master);

include/linux/i3c/master.h

+11 −0
Original line number Diff line number Diff line
@@ -24,6 +24,12 @@ 


struct i2c_client;



/* notifier actions. notifier call data is the struct i3c_bus */

enum {

	I3C_NOTIFY_BUS_ADD,

	I3C_NOTIFY_BUS_REMOVE,

};



struct i3c_master_controller;

struct i3c_bus;

struct i3c_device;
@@ -652,4 +658,9 @@ void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot); 


struct i3c_ibi_slot *i3c_master_get_free_ibi_slot(struct i3c_dev_desc *dev);



void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data),

			     void *data);

int i3c_register_notifier(struct notifier_block *nb);

int i3c_unregister_notifier(struct notifier_block *nb);



#endif /* I3C_MASTER_H */