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i3c: Add support for bus enumeration & notification

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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: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jeremy Kerr 2023-10-13 12:06:24 +08:00 committed by Paolo Abeni
parent ee71d6d5f1
commit 0ac6486e5c
2 changed files with 46 additions and 0 deletions
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35
drivers/i3c/master.c
View File

@ -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);

11
include/linux/i3c/master.h
View File

@ -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 */