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90b066b15e
Several drivers want to know if the acpi-video is generating key-presses for brightness change hotkeys to avoid sending double key-events to userspace for these. Currently these driver use this construct for this: if (acpi_video_get_backlight_type() == acpi_backlight_vendor) report_brightness_key_event(); This indirect way of detecting if acpi-video is active does not make the code easier to understand, and in some cases it is wrong because just because the preferred type != vendor does not mean that acpi-video is actually listening for brightness events, e.g. there may be no acpi-video bus on the system at all. This commit adds a acpi_video_handles_brightness_key_presses() helper function, making the code needing this functionality both easier to read and more correct. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#ifndef __ACPI_VIDEO_H
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#define __ACPI_VIDEO_H
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#include <linux/errno.h> /* for ENODEV */
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#include <linux/types.h> /* for bool */
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struct acpi_device;
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#define ACPI_VIDEO_CLASS "video"
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#define ACPI_VIDEO_DISPLAY_CRT 1
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#define ACPI_VIDEO_DISPLAY_TV 2
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#define ACPI_VIDEO_DISPLAY_DVI 3
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#define ACPI_VIDEO_DISPLAY_LCD 4
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#define ACPI_VIDEO_DISPLAY_LEGACY_MONITOR 0x0100
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#define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x0110
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#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
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enum acpi_backlight_type {
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acpi_backlight_undef = -1,
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acpi_backlight_none = 0,
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acpi_backlight_video,
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acpi_backlight_vendor,
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acpi_backlight_native,
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};
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#if IS_ENABLED(CONFIG_ACPI_VIDEO)
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extern int acpi_video_register(void);
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extern void acpi_video_unregister(void);
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extern int acpi_video_get_edid(struct acpi_device *device, int type,
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int device_id, void **edid);
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extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
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extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
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extern bool acpi_video_handles_brightness_key_presses(void);
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#else
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static inline int acpi_video_register(void) { return 0; }
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static inline void acpi_video_unregister(void) { return; }
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static inline int acpi_video_get_edid(struct acpi_device *device, int type,
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int device_id, void **edid)
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{
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return -ENODEV;
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}
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static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
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{
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return acpi_backlight_vendor;
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}
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static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
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{
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}
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static inline bool acpi_video_handles_brightness_key_presses(void)
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{
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return false;
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}
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#endif
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#endif
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