@@ -105,6 +105,26 @@ struct calling_interface_token *dell_smbios_find_token(int tokenid)
}
EXPORT_SYMBOL_GPL(dell_smbios_find_token);
+static ATOMIC_NOTIFIER_HEAD(dell_laptop_chain_head);
+
+int dell_laptop_register_notifier(struct notifier_block *nb)
+{
+ return atomic_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 atomic_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)
+{
+ atomic_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 */
@@ -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
There are several cases where events handled in one of the dell-* drivers need to be propagated to another dell-* driver. This commits add 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> --- Changes in v2: -This is a new patch in v2 of this patch-set Changes in v3: -No changes Changes in v4: -Rename functions from dell_smbios_*_notifier to dell_laptop_*_notifier Changes in v5: -Dropped due to new led-trigger based approach making this unnecessary Changes in v6: -Re-introduced as led-trigger based approach got nacked --- drivers/platform/x86/dell-smbios.c | 20 ++++++++++++++++++++ drivers/platform/x86/dell-smbios.h | 11 +++++++++++ 2 files changed, 31 insertions(+)