ACPI: Battery: add sysfs alarm

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 057a5eb67ccc9959d4bdfc5f3f5cb2e258971d15..681e26b56b11c2b37a3e242db63ee9ef1dc6444a 100644 (file)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -687,6 +687,34 @@ static void acpi_battery_remove_fs(struct acpi_device *device)
 }
 
 #endif
+
+static ssize_t acpi_battery_alarm_show(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *buf)
+{
+       struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+       return sprintf(buf, "%d\n", battery->alarm * 1000);
+}
+
+static ssize_t acpi_battery_alarm_store(struct device *dev,
+                                       struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       unsigned long x;
+       struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
+       if (sscanf(buf, "%ld\n", &x) == 1)
+               battery->alarm = x/1000;
+       if (acpi_battery_present(battery))
+               acpi_battery_set_alarm(battery);
+       return count;
+}
+
+static struct device_attribute alarm_attr = {
+       .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
+       .show = acpi_battery_alarm_show,
+       .store = acpi_battery_alarm_store,
+};
+
 /* --------------------------------------------------------------------------
                                  Driver Interface
    -------------------------------------------------------------------------- */
@@ -732,6 +760,7 @@ static int acpi_battery_add(struct acpi_device *device)
        battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
        battery->bat.get_property = acpi_battery_get_property;
        result = power_supply_register(&battery->device->dev, &battery->bat);
+       result = device_create_file(battery->bat.dev, &alarm_attr);
        status = acpi_install_notify_handler(device->handle,
                                             ACPI_ALL_NOTIFY,
                                             acpi_battery_notify, battery);
@@ -767,8 +796,10 @@ static int acpi_battery_remove(struct acpi_device *device, int type)
 #ifdef CONFIG_ACPI_PROCFS
        acpi_battery_remove_fs(device);
 #endif
-       if (battery->bat.dev)
+       if (battery->bat.dev) {
+               device_remove_file(battery->bat.dev, &alarm_attr);
                power_supply_unregister(&battery->bat);
+       }
        mutex_destroy(&battery->lock);
        kfree(battery);
        return 0;