+struct bios_args {
+ u32 dev_id;
+ u32 ctrl_param;
+};
+
+struct eeepc_wmi {
+ struct input_dev *inputdev;
+ struct backlight_device *backlight_device;
+};
+
+static struct platform_device *platform_device;
+
+static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
+{
+ int err;
+
+ eeepc->inputdev = input_allocate_device();
+ if (!eeepc->inputdev)
+ return -ENOMEM;
+
+ eeepc->inputdev->name = "Eee PC WMI hotkeys";
+ eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
+ eeepc->inputdev->id.bustype = BUS_HOST;
+ eeepc->inputdev->dev.parent = &platform_device->dev;
+
+ err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ err = input_register_device(eeepc->inputdev);
+ if (err)
+ goto err_free_keymap;
+
+ return 0;
+
+err_free_keymap:
+ sparse_keymap_free(eeepc->inputdev);
+err_free_dev:
+ input_free_device(eeepc->inputdev);
+ return err;
+}
+
+static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
+{
+ if (eeepc->inputdev) {
+ sparse_keymap_free(eeepc->inputdev);
+ input_unregister_device(eeepc->inputdev);
+ }
+
+ eeepc->inputdev = NULL;
+}
+
+static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
+{
+ struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+ u32 tmp;
+
+ status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+ 1, EEEPC_WMI_METHODID_DSTS, &input, &output);
+
+ if (ACPI_FAILURE(status))
+ return status;
+
+ obj = (union acpi_object *)output.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ tmp = (u32)obj->integer.value;
+ else
+ tmp = 0;
+
+ if (ctrl_param)
+ *ctrl_param = tmp;
+
+ kfree(obj);
+
+ return status;
+
+}
+
+static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
+{
+ struct bios_args args = {
+ .dev_id = dev_id,
+ .ctrl_param = ctrl_param,
+ };
+ struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+ acpi_status status;
+
+ status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+ 1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
+
+ return status;
+}
+
+static int read_brightness(struct backlight_device *bd)
+{
+ static u32 ctrl_param;
+ acpi_status status;
+
+ status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
+
+ if (ACPI_FAILURE(status))
+ return -1;
+ else
+ return ctrl_param & 0xFF;
+}
+
+static int update_bl_status(struct backlight_device *bd)
+{
+
+ static u32 ctrl_param;
+ acpi_status status;
+
+ ctrl_param = bd->props.brightness;
+
+ status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
+
+ if (ACPI_FAILURE(status))
+ return -1;
+ else
+ return 0;
+}
+
+static const struct backlight_ops eeepc_wmi_bl_ops = {
+ .get_brightness = read_brightness,
+ .update_status = update_bl_status,
+};
+
+static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
+{
+ struct backlight_device *bd = eeepc->backlight_device;
+ int old = bd->props.brightness;
+ int new;
+
+ if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
+ new = code - NOTIFY_BRNUP_MIN + 1;
+ else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
+ new = code - NOTIFY_BRNDOWN_MIN;
+
+ bd->props.brightness = new;
+ backlight_update_status(bd);
+ backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
+
+ return old;
+}
+
+static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
+{
+ struct backlight_device *bd;
+ struct backlight_properties props;
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.max_brightness = 15;
+ bd = backlight_device_register(EEEPC_WMI_FILE,
+ &platform_device->dev, eeepc,
+ &eeepc_wmi_bl_ops, &props);
+ if (IS_ERR(bd)) {
+ pr_err("Could not register backlight device\n");
+ return PTR_ERR(bd);
+ }
+
+ eeepc->backlight_device = bd;
+
+ bd->props.brightness = read_brightness(bd);
+ bd->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
+{
+ if (eeepc->backlight_device)
+ backlight_device_unregister(eeepc->backlight_device);
+
+ eeepc->backlight_device = NULL;
+}