summaryrefslogtreecommitdiff
path: root/drivers/platform
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/dell-laptop.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 7424e53157b0..dd5043a6a114 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -1177,6 +1177,7 @@ static u8 kbd_previous_mode_bit;
static bool kbd_led_present;
static DEFINE_MUTEX(kbd_led_mutex);
+static enum led_brightness kbd_led_level;
/*
* NOTE: there are three ways to set the keyboard backlight level.
@@ -2020,6 +2021,7 @@ static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
static int kbd_led_level_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
+ enum led_brightness new_value = value;
struct kbd_state state;
struct kbd_state new_state;
u16 num;
@@ -2049,6 +2051,9 @@ static int kbd_led_level_set(struct led_classdev *led_cdev,
}
out:
+ if (ret == 0)
+ kbd_led_level = new_value;
+
mutex_unlock(&kbd_led_mutex);
return ret;
}
@@ -2076,6 +2081,9 @@ static int __init kbd_led_init(struct device *dev)
if (kbd_led.max_brightness)
kbd_led.max_brightness--;
}
+
+ kbd_led_level = kbd_led_level_get(NULL);
+
ret = led_classdev_register(dev, &kbd_led);
if (ret)
kbd_led_present = false;
@@ -2100,13 +2108,25 @@ static void kbd_led_exit(void)
static int dell_laptop_notifier_call(struct notifier_block *nb,
unsigned long action, void *data)
{
+ bool changed = false;
+ enum led_brightness new_kbd_led_level;
+
switch (action) {
case DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED:
if (!kbd_led_present)
break;
- led_classdev_notify_brightness_hw_changed(&kbd_led,
- kbd_led_level_get(&kbd_led));
+ mutex_lock(&kbd_led_mutex);
+ new_kbd_led_level = kbd_led_level_get(&kbd_led);
+ if (kbd_led_level != new_kbd_led_level) {
+ kbd_led_level = new_kbd_led_level;
+ changed = true;
+ }
+ mutex_unlock(&kbd_led_mutex);
+
+ if (changed)
+ led_classdev_notify_brightness_hw_changed(&kbd_led,
+ kbd_led_level);
break;
}