diff options
| author | Hans de Goede | 2017-03-16 11:55:32 +0100 |
|---|---|---|
| committer | Darren Hart (VMware) | 2017-04-13 10:12:19 -0700 |
| commit | 504b02593fc5c24575d7d50d1b388b5ecf9354ee (patch) | |
| tree | 8defdd3603f917889ea0e0de629c264b14b5bb94 /drivers/platform/x86/dell-smbios.c | |
| parent | 979800e73d2fcda96cda5076f3425f823fdda0d8 (diff) | |
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: Hans de Goede <hdegoede@redhat.com>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Diffstat (limited to 'drivers/platform/x86/dell-smbios.c')
| -rw-r--r-- | drivers/platform/x86/dell-smbios.c | 20 |
1 files changed, 20 insertions, 0 deletions
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 */ |