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Message-Id: <20231003063624.126723-3-matt@codeconstruct.com.au> Date: Tue, 3 Oct 2023 14:36:23 +0800 From: Matt Johnston <matt@...econstruct.com.au> To: linux-i3c@...ts.infradead.org, netdev@...r.kernel.org, devicetree@...r.kernel.org Cc: Jeremy Kerr <jk@...econstruct.com.au>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Alexandre Belloni <alexandre.belloni@...tlin.com>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org> Subject: [PATCH net-next v3 2/3] i3c: Add support for bus enumeration & notification From: Jeremy Kerr <jk@...econstruct.com.au> 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@...econstruct.com.au> Signed-off-by: Matt Johnston <matt@...econstruct.com.au> Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com> --- drivers/i3c/master.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/i3c/master.h | 11 +++++++++++ 2 files changed, 46 insertions(+) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 87283e4a4607..959ec5269376 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -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); diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 0b52da4f2346..db909ef79be4 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -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 */ -- 2.39.2
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