linuxkpi: Add backlight_device_set_brightness

This simply set the brightness of a backlight device.
Needed by drm-kmod v5.8

Reviewed by:	bz, emaste
MFC after:	2 weeks
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D34285

(cherry picked from commit 2cc3af6e1d795c6d33afaf994c18abaab87a443b)

diff --git a/sys/compat/linuxkpi/common/include/linux/backlight.h b/sys/compat/linuxkpi/common/include/linux/backlight.h
index 38b3786e738ddd84960662ad38d80bdcba76917e..9591a4b671ab85f08b0605f406fcc6c61bfd90f6 100644 (file)
--- a/sys/compat/linuxkpi/common/include/linux/backlight.h
+++ b/sys/compat/linuxkpi/common/include/linux/backlight.h
@@ -91,6 +91,16 @@ backlight_force_update(struct backlight_device *bd, int reason)
        bd->props.brightness = bd->ops->get_brightness(bd);
 }
 
+static inline int
+backlight_device_set_brightness(struct backlight_device *bd, int brightness)
+{
+
+       if (brightness > bd->props.max_brightness)
+               return (EINVAL);
+       bd->props.brightness = brightness;
+       return (bd->ops->update_status(bd));
+}
+
 static inline int
 backlight_enable(struct backlight_device *bd)
 {