ACPI: AC: Add sysfs interface

Refer to Documentation/power_supply_class.txt for interface description.

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

2 files changed, 32 insertions, 3 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ba6a61f7aae7..a858bc528ec3 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -88,7 +88,7 @@ config ACPI_PROC_EVENT
 
 config ACPI_AC
         tristate "AC Adapter"
-        depends on X86
+        depends on X86 && POWER_SUPPLY
         default y
         help
           This driver adds support for the AC Adapter object, which indicates
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 26d70702b313..e03de37a750d 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -29,6 +29,7 @@
 #include <linux/types.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/power_supply.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
@@ -72,16 +73,37 @@ static struct acpi_driver acpi_ac_driver = {
 };
 
 struct acpi_ac {
+        struct power_supply charger;
         struct acpi_device * device;
         unsigned long state;
 };
 
+#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
+
 static const struct file_operations acpi_ac_fops = {
         .open = acpi_ac_open_fs,
         .read = seq_read,
         .llseek = seq_lseek,
         .release = single_release,
 };
+static int get_ac_property(struct power_supply *psy,
+                           enum power_supply_property psp,
+                           union power_supply_propval *val)
+{
+        struct acpi_ac *ac = to_acpi_ac(psy);
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = ac->state;
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static enum power_supply_property ac_props[] = {
+        POWER_SUPPLY_PROP_ONLINE,
+};
 
 /* --------------------------------------------------------------------------
                                AC Adapter Management
@@ -208,6 +230,7 @@ static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
                 acpi_bus_generate_netlink_event(device->pnp.device_class,
                                                   device->dev.bus_id, event,
                                                   (u32) ac->state);
+                kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
                 break;
         default:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
@@ -244,7 +267,12 @@ static int acpi_ac_add(struct acpi_device *device)
         result = acpi_ac_add_fs(device);
         if (result)
                 goto end;
-
+        ac->charger.name = acpi_device_bid(device);
+        ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
+        ac->charger.properties = ac_props;
+        ac->charger.num_properties = ARRAY_SIZE(ac_props);
+        ac->charger.get_property = get_ac_property;
+        power_supply_register(&ac->device->dev, &ac->charger);
         status = acpi_install_notify_handler(device->handle,
                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
                                              ac);
@@ -279,7 +307,8 @@ static int acpi_ac_remove(struct acpi_device *device, int type)
 
         status = acpi_remove_notify_handler(device->handle,
                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
-
+        if (ac->charger.dev)
+                power_supply_unregister(&ac->charger);
         acpi_ac_remove_fs(device);
 
         kfree(ac);