1 files changed, 26 insertions, 12 deletions

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 753b34885f9d..7ea6a8f66056 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -178,6 +178,8 @@ static const int debug;
 static struct platform_device *pdev;
 static s16 rest_x;
 static s16 rest_y;
+static u8 backlight_state[2];
+
 static struct device *hwmon_dev;
 static struct input_polled_dev *applesmc_idev;
 
@@ -497,17 +499,36 @@ static int applesmc_probe(struct platform_device *dev)
         return 0;
 }
 
-static int applesmc_resume(struct platform_device *dev)
+/* Synchronize device with memorized backlight state */
+static int applesmc_pm_resume(struct device *dev)
 {
-        return applesmc_device_init();
+        mutex_lock(&applesmc_lock);
+        if (applesmc_light)
+                applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
+        mutex_unlock(&applesmc_lock);
+        return 0;
 }
 
+/* Reinitialize device on resume from hibernation */
+static int applesmc_pm_restore(struct device *dev)
+{
+        int ret = applesmc_device_init();
+        if (ret)
+                return ret;
+        return applesmc_pm_resume(dev);
+}
+
+static struct dev_pm_ops applesmc_pm_ops = {
+        .resume = applesmc_pm_resume,
+        .restore = applesmc_pm_restore,
+};
+
 static struct platform_driver applesmc_driver = {
         .probe = applesmc_probe,
-        .resume = applesmc_resume,
         .driver = {
                 .name = "applesmc",
                 .owner = THIS_MODULE,
+                .pm = &applesmc_pm_ops,
         },
 };
 
@@ -804,17 +825,10 @@ static ssize_t applesmc_calibrate_store(struct device *dev,
         return count;
 }
 
-/* Store the next backlight value to be written by the work */
-static unsigned int backlight_value;
-
 static void applesmc_backlight_set(struct work_struct *work)
 {
-        u8 buffer[2];
-
         mutex_lock(&applesmc_lock);
-        buffer[0] = backlight_value;
-        buffer[1] = 0x00;
-        applesmc_write_key(BACKLIGHT_KEY, buffer, 2);
+        applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
         mutex_unlock(&applesmc_lock);
 }
 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
@@ -824,7 +838,7 @@ static void applesmc_brightness_set(struct led_classdev *led_cdev,
 {
         int ret;
 
-        backlight_value = value;
+        backlight_state[0] = value;
         ret = queue_work(applesmc_led_wq, &backlight_work);
 
         if (debug && (!ret))