asus-laptop: Add *_led_get() functions

Add support for getting led brightness directly from
the hardware. Currently we don't need it, but it is needed
to support keyboard backlight/led.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 23449508d86b..88cc9a1045b4 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -246,12 +246,15 @@ static struct workqueue_struct *led_workqueue;
 #define ASUS_LED(object, ledname)                                       \
         static void object##_led_set(struct led_classdev *led_cdev,     \
                                      enum led_brightness value);        \
+        static enum led_brightness object##_led_get(                    \
+                struct led_classdev *led_cdev);                         \
         static void object##_led_update(struct work_struct *ignored);   \
         static int object##_led_wk;                                     \
         static DECLARE_WORK(object##_led_work, object##_led_update);    \
         static struct led_classdev object##_led = {                     \
                 .name           = "asus::" ledname,                     \
                 .brightness_set = object##_led_set,                     \
+                .brightness_get = object##_led_get,                     \
         }
 
 ASUS_LED(mled, "mail");
@@ -399,6 +402,11 @@ static void write_status(acpi_handle handle, int out, int mask)
         {                                                               \
                 int value = object##_led_wk;                            \
                 write_status(object##_set_handle, value, (mask));       \
+        }                                                               \
+        static enum led_brightness object##_led_get(                    \
+                struct led_classdev *led_cdev)                          \
+        {                                                               \
+                return led_cdev->brightness;                            \
         }
 
 ASUS_LED_HANDLER(mled, MLED_ON);