ACPI: check battery status on resume for un/plug events during sleep

Add ->resume method to the ACPI battery handler to check
if the battery state has changed during sleep.
If yes, update the ACPI internal data structures
for benefit of /proc/acpi/battery/.

Signed-off-by: Jiri Kosina <jikos@jikos.cz>
Cc: Stefan Seyfried <seife@suse.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 9810e2a55d0a..026e40755cdd 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -64,6 +64,7 @@ extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
 
 static int acpi_battery_add(struct acpi_device *device);
 static int acpi_battery_remove(struct acpi_device *device, int type);
+static int acpi_battery_resume(struct acpi_device *device, int status);
 
 static struct acpi_driver acpi_battery_driver = {
         .name = ACPI_BATTERY_DRIVER_NAME,
@@ -71,6 +72,7 @@ static struct acpi_driver acpi_battery_driver = {
         .ids = ACPI_BATTERY_HID,
         .ops = {
                 .add = acpi_battery_add,
+                .resume = acpi_battery_resume,
                 .remove = acpi_battery_remove,
                 },
 };
@@ -753,6 +755,18 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
         return 0;
 }
 
+/* this is needed to learn about changes made in suspended state */
+static int acpi_battery_resume(struct acpi_device *device, int state)
+{
+        struct acpi_battery *battery;
+
+        if (!device)
+                return -EINVAL;
+
+        battery = device->driver_data;
+        return acpi_battery_check(battery);
+}
+
 static int __init acpi_battery_init(void)
 {
         int result;