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>

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index ba6a61f..a858bc5 100644 (file)
--- 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 26d7070..e03de37 100644 (file)
--- 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);