linux/include/acpi/video.h
Arvind Yadav 0346223a2f ACPI / video: Dummy acpi_video_register should return error code
The inline acpi_video_register stub simply allows compilation on systems
with CONFIG_ACPI_VIDEO disabled. the dummy acpi_video_register does not
register an acpi_bus_driver at all. The inline acpi_video_register should
return to indicate lack of support when attempting to register an
acpi_bus_driver on such a system with CONFIG_ACPI_VIDEO disabled.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-06-25 02:56:59 +02:00

84 lines
2.3 KiB
C

#ifndef __ACPI_VIDEO_H
#define __ACPI_VIDEO_H
#include <linux/errno.h> /* for ENODEV */
#include <linux/types.h> /* for bool */
struct acpi_video_brightness_flags {
u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
u8 _BQC_use_index:1; /* _BQC returns an index value */
};
struct acpi_video_device_brightness {
int curr;
int count;
int *levels;
struct acpi_video_brightness_flags flags;
};
struct acpi_device;
#define ACPI_VIDEO_CLASS "video"
#define ACPI_VIDEO_DISPLAY_CRT 1
#define ACPI_VIDEO_DISPLAY_TV 2
#define ACPI_VIDEO_DISPLAY_DVI 3
#define ACPI_VIDEO_DISPLAY_LCD 4
#define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x0100
#define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x0110
#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
enum acpi_backlight_type {
acpi_backlight_undef = -1,
acpi_backlight_none = 0,
acpi_backlight_video,
acpi_backlight_vendor,
acpi_backlight_native,
};
#if IS_ENABLED(CONFIG_ACPI_VIDEO)
extern int acpi_video_register(void);
extern void acpi_video_unregister(void);
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 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
/*
* Note: The value returned by acpi_video_handles_brightness_key_presses()
* may change over time and should not be cached.
*/
extern bool acpi_video_handles_brightness_key_presses(void);
extern int acpi_video_get_levels(struct acpi_device *device,
struct acpi_video_device_brightness **dev_br,
int *pmax_level);
#else
static inline int acpi_video_register(void) { return -ENODEV; }
static inline void acpi_video_unregister(void) { return; }
static inline int acpi_video_get_edid(struct acpi_device *device, int type,
int device_id, void **edid)
{
return -ENODEV;
}
static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
{
return acpi_backlight_vendor;
}
static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
{
}
static inline bool acpi_video_handles_brightness_key_presses(void)
{
return false;
}
static inline int acpi_video_get_levels(struct acpi_device *device,
struct acpi_video_device_brightness **dev_br,
int *pmax_level)
{
return -ENODEV;
}
#endif
#endif