asus-wmi: restore kbd led level after resume

Afters suspend/resume cycle with closed lid the kbd backlight level
is lost. This patch will will restore this value to last known level.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index efbc3f0c592b..1f7d80ff8cb4 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -582,7 +582,7 @@ static void asus_wmi_led_exit(struct asus_wmi *asus)
 
 static int asus_wmi_led_init(struct asus_wmi *asus)
 {
-        int rv = 0;
+        int rv = 0, led_val;
 
         asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
         if (!asus->led_workqueue)
@@ -602,9 +602,11 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
                         goto error;
         }
 
-        if (kbd_led_read(asus, NULL, NULL) >= 0) {
+        led_val = kbd_led_read(asus, NULL, NULL);
+        if (led_val >= 0) {
                 INIT_WORK(&asus->kbd_led_work, kbd_led_update);
 
+                asus->kbd_led_wk = led_val;
                 asus->kbd_led.name = "asus::kbd_backlight";
                 asus->kbd_led.brightness_set = kbd_led_set;
                 asus->kbd_led.brightness_get = kbd_led_get;
@@ -2160,6 +2162,16 @@ static int asus_hotk_thaw(struct device *device)
         return 0;
 }
 
+static int asus_hotk_resume(struct device *device)
+{
+        struct asus_wmi *asus = dev_get_drvdata(device);
+
+        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
+                queue_work(asus->led_workqueue, &asus->kbd_led_work);
+
+        return 0;
+}
+
 static int asus_hotk_restore(struct device *device)
 {
         struct asus_wmi *asus = dev_get_drvdata(device);
@@ -2190,6 +2202,8 @@ static int asus_hotk_restore(struct device *device)
                 bl = !asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_UWB);
                 rfkill_set_sw_state(asus->uwb.rfkill, bl);
         }
+        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
+                queue_work(asus->led_workqueue, &asus->kbd_led_work);
 
         return 0;
 }
@@ -2197,6 +2211,7 @@ static int asus_hotk_restore(struct device *device)
 static const struct dev_pm_ops asus_pm_ops = {
         .thaw = asus_hotk_thaw,
         .restore = asus_hotk_restore,
+        .resume = asus_hotk_resume,
 };
 
 static int asus_wmi_probe(struct platform_device *pdev)