platform/x86: lenovo-yogabook: Stop checking adev->power.state

lenovo-yogabook-wmi: controls the power-state itself and stores
this in data->flags so there is no need to poke inside ACPI device
internals.

This is a preparation patch for making lenovo-yogabook-wmi also work
on the Android version of the Yoga Book 1 which does not have a WMI
interface to deal with toggling the keyboard half between
touch-keyboard and wacom-digitizer mode.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430165807.472798-12-hdegoede@redhat.com

drivers/platform/x86/lenovo-yogabook-wmi.c

@@ -50,13 +50,11 @@ static int yogabook_wmi_set_kbd_backlight(struct yogabook_wmi *data,
 	union acpi_object param;
 	acpi_status status;
 
-	if (data->kbd_adev->power.state != ACPI_STATE_D0) {
-		dev_warn(data->dev, "keyboard touchscreen not in D0, cannot set brightness\n");
-		return -ENXIO;
-	}
-
 	dev_dbg(data->dev, "Set KBLC level to %u\n", level);
 
+	/* Ensure keyboard touchpad is on before we call KBLC() */
+	acpi_device_set_power(data->kbd_adev, ACPI_STATE_D0);
+
 	input.count = 1;
 	input.pointer = &param;
 
@@ -181,7 +179,7 @@ static int kbd_brightness_set(struct led_classdev *cdev,
 
 	data->brightness = value;
 
-	if (data->kbd_adev->power.state != ACPI_STATE_D0)
+	if (!test_bit(YB_KBD_IS_ON, &data->flags))
 		return 0;
 
 	return yogabook_wmi_set_kbd_backlight(data, data->brightness);
@@ -353,11 +351,8 @@ static int yogabook_resume(struct device *dev)
 {
 	struct yogabook_wmi *data = dev_get_drvdata(dev);
 
-	if (test_bit(YB_KBD_IS_ON, &data->flags)) {
-		/* Ensure keyboard touchpad is on before we call KBLC() */
-		acpi_device_set_power(data->kbd_adev, ACPI_STATE_D0);
+	if (test_bit(YB_KBD_IS_ON, &data->flags))
 		yogabook_wmi_set_kbd_backlight(data, data->brightness);
-	}
 
 	clear_bit(YB_SUSPENDED, &data->flags);