On resume from suspend, the driver currently resets the logical
state as if it was brought up from halt. This patch uses the
dev_pm_ops.resume method to synchronize the hardware with the
memorized logical state, bringing back the backlight to the level
prior to suspend.
Signed-off-by: Henrik Rydberg <rydberg at euromail.se>
---
drivers/hwmon/applesmc.c | 27 +++++++++++++++------------
1 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 678e34b..0b781c8 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 +499,25 @@ 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);
+ applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
+ mutex_unlock(&applesmc_lock);
+ return 0;
}
+static struct dev_pm_ops applesmc_pm_ops = {
+ .resume = applesmc_pm_resume,
+};
+
static struct platform_driver applesmc_driver = {
.probe = applesmc_probe,
- .resume = applesmc_resume,
.driver = {
.name = "applesmc",
.owner = THIS_MODULE,
+ .pm = &applesmc_pm_ops,
},
};
@@ -804,17 +814,10 @@ 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 +827,7 @@ 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))
--
1.6.3.3
