Commit 504b0259 authored by Hans de Goede's avatar Hans de Goede Committed by Darren Hart (VMware)

platform/x86: dell-*: Add a generic dell-laptop notifier chain

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: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarPali Rohár <pali.rohar@gmail.com>
Signed-off-by: default avatarDarren Hart (VMware) <dvhart@infradead.org>
parent 979800e7
...@@ -105,6 +105,26 @@ struct calling_interface_token *dell_smbios_find_token(int tokenid) ...@@ -105,6 +105,26 @@ struct calling_interface_token *dell_smbios_find_token(int tokenid)
} }
EXPORT_SYMBOL_GPL(dell_smbios_find_token); 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) static void __init parse_da_table(const struct dmi_header *dm)
{ {
/* Final token is a terminator, so we don't want to copy it */ /* Final token is a terminator, so we don't want to copy it */
......
...@@ -16,6 +16,8 @@ ...@@ -16,6 +16,8 @@
#ifndef _DELL_SMBIOS_H_ #ifndef _DELL_SMBIOS_H_
#define _DELL_SMBIOS_H_ #define _DELL_SMBIOS_H_
struct notifier_block;
/* This structure will be modified by the firmware when we enter /* This structure will be modified by the firmware when we enter
* system management mode, hence the volatiles */ * system management mode, hence the volatiles */
...@@ -43,4 +45,13 @@ void dell_smbios_release_buffer(void); ...@@ -43,4 +45,13 @@ void dell_smbios_release_buffer(void);
void dell_smbios_send_request(int class, int select); void dell_smbios_send_request(int class, int select);
struct calling_interface_token *dell_smbios_find_token(int tokenid); 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 #endif
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