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

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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 <hdegoede@redhat.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
This commit is contained in:
Hans de Goede 2017-03-16 11:55:32 +01:00 committed by Darren Hart (VMware)
parent 979800e73d
commit 504b02593f
2 changed files with 31 additions and 0 deletions
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20
drivers/platform/x86/dell-smbios.c
View File

@ -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 */

11
drivers/platform/x86/dell-smbios.h
View File

@ -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