From: Chaoyi Chen <[email protected]> Some other part of kernel may want to know the event of typec bus.
This patch add common notifier function to notify these event. Signed-off-by: Chaoyi Chen <[email protected]> --- Changes in v8: - Fix coding style. drivers/usb/typec/Makefile | 2 +- drivers/usb/typec/bus.h | 2 ++ drivers/usb/typec/class.c | 3 +++ drivers/usb/typec/notify.c | 24 ++++++++++++++++++++++++ include/linux/usb/typec_notify.h | 16 ++++++++++++++++ 5 files changed, 46 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/typec/notify.c create mode 100644 include/linux/usb/typec_notify.h diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile index 7a368fea61bc..20d09c5314d7 100644 --- a/drivers/usb/typec/Makefile +++ b/drivers/usb/typec/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_TYPEC) += typec.o -typec-y := class.o mux.o bus.o pd.o retimer.o +typec-y := class.o mux.o notify.o bus.o pd.o retimer.o typec-$(CONFIG_ACPI) += port-mapper.o obj-$(CONFIG_TYPEC) += altmodes/ obj-$(CONFIG_TYPEC_TCPM) += tcpm/ diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h index 643b8c81786d..820b59b6d434 100644 --- a/drivers/usb/typec/bus.h +++ b/drivers/usb/typec/bus.h @@ -26,6 +26,8 @@ struct altmode { struct altmode *plug[2]; }; +void typec_notify_event(unsigned long event, void *data); + #define to_altmode(d) container_of(d, struct altmode, adev) extern const struct bus_type typec_bus; diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c index 9b2647cb199b..51e971bc68d1 100644 --- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -13,6 +13,7 @@ #include <linux/string_choices.h> #include <linux/usb/pd_vdo.h> #include <linux/usb/typec_mux.h> +#include <linux/usb/typec_notify.h> #include <linux/usb/typec_retimer.h> #include <linux/usb.h> @@ -600,6 +601,8 @@ typec_register_altmode(struct device *parent, return ERR_PTR(ret); } + typec_notify_event(TYPEC_ALTMODE_REGISTERED, &alt->adev); + return &alt->adev; } diff --git a/drivers/usb/typec/notify.c b/drivers/usb/typec/notify.c new file mode 100644 index 000000000000..0a14d3ae224e --- /dev/null +++ b/drivers/usb/typec/notify.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/notifier.h> +#include <linux/usb/typec_notify.h> + +#include "bus.h" + +static BLOCKING_NOTIFIER_HEAD(typec_notifier_list); + +int typec_altmode_register_notify(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&typec_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(typec_altmode_register_notify); + +int typec_altmode_unregister_notify(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&typec_notifier_list, nb); +} +EXPORT_SYMBOL_GPL(typec_altmode_unregister_notify); + +void typec_notify_event(unsigned long event, void *data) +{ + blocking_notifier_call_chain(&typec_notifier_list, event, data); +} diff --git a/include/linux/usb/typec_notify.h b/include/linux/usb/typec_notify.h new file mode 100644 index 000000000000..f3a7b5f5b05b --- /dev/null +++ b/include/linux/usb/typec_notify.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __USB_TYPEC_NOTIFY +#define __USB_TYPEC_NOTIFY + +#include <linux/notifier.h> + +enum usb_typec_event { + TYPEC_ALTMODE_REGISTERED, + TYPEC_ALTMODE_UNREGISTERED, +}; + +int typec_altmode_register_notify(struct notifier_block *nb); +int typec_altmode_unregister_notify(struct notifier_block *nb); + +#endif /* __USB_TYPEC_NOTIFY */ -- 2.49.0
