platform/x86: fujitsu-laptop: switch to a managed backlight device

Use a managed backlight device to get rid of acpi_fujitsu_bl_remove().
Change the parent of the backlight device from NULL to the FUJ02B1 ACPI
device as the latter is required for the backlight device to work.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Reviewed-by: Jonathan Woithe <jwoithe@just42.net>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 5e3e951..f90b129 100644 (file)
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -550,17 +550,18 @@ static int acpi_fujitsu_bl_input_setup(struct acpi_device *device)
        return input_register_device(fujitsu_bl->input);
 }
 
-static int fujitsu_backlight_register(void)
+static int fujitsu_backlight_register(struct acpi_device *device)
 {
-       struct backlight_properties props = {
+       const struct backlight_properties props = {
                .brightness = fujitsu_bl->brightness_level,
                .max_brightness = fujitsu_bl->max_brightness - 1,
                .type = BACKLIGHT_PLATFORM
        };
        struct backlight_device *bd;
 
-       bd = backlight_device_register("fujitsu-laptop", NULL, NULL,
-                                      &fujitsu_bl_ops, &props);
+       bd = devm_backlight_device_register(&device->dev, "fujitsu-laptop",
+                                           &device->dev, NULL,
+                                           &fujitsu_bl_ops, &props);
        if (IS_ERR(bd))
                return PTR_ERR(bd);
 
@@ -629,24 +630,13 @@ static int acpi_fujitsu_bl_add(struct acpi_device *device)
                fujitsu_bl->max_brightness = FUJITSU_LCD_N_LEVELS;
        get_lcd_level();
 
-       error = fujitsu_backlight_register();
+       error = fujitsu_backlight_register(device);
        if (error)
                return error;
 
        return 0;
 }
 
-static int acpi_fujitsu_bl_remove(struct acpi_device *device)
-{
-       struct fujitsu_bl *fujitsu_bl = acpi_driver_data(device);
-
-       backlight_device_unregister(fujitsu_bl->bl_device);
-
-       fujitsu_bl->acpi_handle = NULL;
-
-       return 0;
-}
-
 /* Brightness notify */
 
 static void acpi_fujitsu_bl_notify(struct acpi_device *device, u32 event)
@@ -1077,7 +1067,6 @@ static struct acpi_driver acpi_fujitsu_bl_driver = {
        .ids = fujitsu_bl_device_ids,
        .ops = {
                .add = acpi_fujitsu_bl_add,
-               .remove = acpi_fujitsu_bl_remove,
                .notify = acpi_fujitsu_bl_notify,
                },
 };