From 504b02593fc5c24575d7d50d1b388b5ecf9354ee Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Thu, 16 Mar 2017 11:55:32 +0100 Subject: [PATCH] platform/x86: dell-*: Add a generic dell-laptop notifier chain MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit There are several cases where events handled in one of the dell-* drivers need to be propagated to another dell-* driver. This commit adds 3 generic functions: dell_laptop_register_notifier() dell_laptop_unregister_notifier() dell_laptop_call_notifier() It currently only defines 1 action: DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED Which is intended to propagate kbd_backlight_brightness_changed wmi events from dell-wmi to dell-laptop (which contains the actual kbd backlight driver). These functions are put in dell-smbios as both dell-wmi and dell-laptop use smbios functions and I do not want to put the notifier head in either driver, as that will make the 2 drivers depend on each other. Signed-off-by: Hans de Goede Acked-by: Pali Rohár Signed-off-by: Darren Hart (VMware) --- drivers/platform/x86/dell-smbios.c | 20 ++++++++++++++++++++ drivers/platform/x86/dell-smbios.h | 11 +++++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/platform/x86/dell-smbios.c b/drivers/platform/x86/dell-smbios.c index d2412ab097da..0a5723468bff 100644 --- a/drivers/platform/x86/dell-smbios.c +++ b/drivers/platform/x86/dell-smbios.c @@ -105,6 +105,26 @@ struct calling_interface_token *dell_smbios_find_token(int tokenid) } EXPORT_SYMBOL_GPL(dell_smbios_find_token); +static BLOCKING_NOTIFIER_HEAD(dell_laptop_chain_head); + +int dell_laptop_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&dell_laptop_chain_head, nb); +} +EXPORT_SYMBOL_GPL(dell_laptop_register_notifier); + +int dell_laptop_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&dell_laptop_chain_head, nb); +} +EXPORT_SYMBOL_GPL(dell_laptop_unregister_notifier); + +void dell_laptop_call_notifier(unsigned long action, void *data) +{ + blocking_notifier_call_chain(&dell_laptop_chain_head, action, data); +} +EXPORT_SYMBOL_GPL(dell_laptop_call_notifier); + static void __init parse_da_table(const struct dmi_header *dm) { /* Final token is a terminator, so we don't want to copy it */ diff --git a/drivers/platform/x86/dell-smbios.h b/drivers/platform/x86/dell-smbios.h index ec7d40ae5e6e..45cbc2292cd3 100644 --- a/drivers/platform/x86/dell-smbios.h +++ b/drivers/platform/x86/dell-smbios.h @@ -16,6 +16,8 @@ #ifndef _DELL_SMBIOS_H_ #define _DELL_SMBIOS_H_ +struct notifier_block; + /* This structure will be modified by the firmware when we enter * system management mode, hence the volatiles */ @@ -43,4 +45,13 @@ void dell_smbios_release_buffer(void); void dell_smbios_send_request(int class, int select); struct calling_interface_token *dell_smbios_find_token(int tokenid); + +enum dell_laptop_notifier_actions { + DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, +}; + +int dell_laptop_register_notifier(struct notifier_block *nb); +int dell_laptop_unregister_notifier(struct notifier_block *nb); +void dell_laptop_call_notifier(unsigned long action, void *data); + #endif -- 2.20.1