* Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
* sony_acpi,... can take care about backlight brightness.
*
- * Backlight drivers can use acpi_video_get_backlight_type() to determine
- * which driver should handle the backlight.
+ * Backlight drivers can use acpi_video_get_backlight_type() to determine which
+ * driver should handle the backlight. RAW/GPU-driver backlight drivers must
+ * use the acpi_video_backlight_use_native() helper for this.
*
* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
* this file will not be compiled and acpi_video_get_backlight_type() will
* Arguably the native on win8 check should be done first, but that would
* be a behavior change, which may causes issues.
*/
-enum acpi_backlight_type acpi_video_get_backlight_type(void)
+static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
{
static DEFINE_MUTEX(init_mutex);
+ static bool native_available;
static bool init_done;
static long video_caps;
backlight_notifier_registered = true;
init_done = true;
}
+ if (native)
+ native_available = true;
mutex_unlock(&init_mutex);
if (acpi_backlight_cmdline != acpi_backlight_undef)
if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
return acpi_backlight_vendor;
- if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
+ if (acpi_osi_is_win8() &&
+ (native_available || backlight_device_get_by_type(BACKLIGHT_RAW)))
return acpi_backlight_native;
return acpi_backlight_video;
}
+
+enum acpi_backlight_type acpi_video_get_backlight_type(void)
+{
+ return __acpi_video_get_backlight_type(false);
+}
EXPORT_SYMBOL(acpi_video_get_backlight_type);
+bool acpi_video_backlight_use_native(void)
+{
+ return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
+}
+EXPORT_SYMBOL(acpi_video_backlight_use_native);
+
/*
* Set the preferred backlight interface type based on DMI info.
* This function allows DMI blacklists to be implemented by external
extern int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid);
extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
+extern bool acpi_video_backlight_use_native(void);
extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
/*
* Note: The value returned by acpi_video_handles_brightness_key_presses()
{
return acpi_backlight_vendor;
}
+static inline bool acpi_video_backlight_use_native(void)
+{
+ return true;
+}
static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
{
}