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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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519ab5f2be
This patch set adds generic abstract layer support for acpi video driver to have generic user interface to control backlight and output switch control by leveraging the existing backlight sysfs class driver, and by adding a new video output sysfs class driver. This patch: Add dev argument for backlight_device_register to link the class device to real device object. The platform specific driver should find a way to get the real device object for their video device. [akpm@osdl.org: build fix] [akpm@osdl.org: fix msi-laptop.c] Signed-off-by: Luming Yu <Luming.yu@intel.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/*
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* Backlight Lowlevel Control Abstraction
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*
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* Copyright (C) 2003,2004 Hewlett-Packard Company
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*
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*/
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#ifndef _LINUX_BACKLIGHT_H
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#define _LINUX_BACKLIGHT_H
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#include <linux/device.h>
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#include <linux/notifier.h>
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struct backlight_device;
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struct fb_info;
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/* This structure defines all the properties of a backlight
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(usually attached to a LCD). */
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struct backlight_properties {
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/* Owner module */
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struct module *owner;
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/* Notify the backlight driver some property has changed */
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int (*update_status)(struct backlight_device *);
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/* Return the current backlight brightness (accounting for power,
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fb_blank etc.) */
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int (*get_brightness)(struct backlight_device *);
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/* Check if given framebuffer device is the one bound to this backlight;
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return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
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int (*check_fb)(struct fb_info *);
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/* Current User requested brightness (0 - max_brightness) */
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int brightness;
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/* Maximal value for brightness (read-only) */
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int max_brightness;
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/* Current FB Power mode (0: full on, 1..3: power saving
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modes; 4: full off), see FB_BLANK_XXX */
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int power;
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/* FB Blanking active? (values as for power) */
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int fb_blank;
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};
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struct backlight_device {
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/* This protects the 'props' field. If 'props' is NULL, the driver that
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registered this device has been unloaded, and if class_get_devdata()
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points to something in the body of that driver, it is also invalid. */
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struct semaphore sem;
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/* If this is NULL, the backing module is unloaded */
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struct backlight_properties *props;
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/* The framebuffer notifier block */
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struct notifier_block fb_notif;
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/* The class device structure */
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struct class_device class_dev;
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};
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extern struct backlight_device *backlight_device_register(const char *name,
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struct device *dev,void *devdata,struct backlight_properties *bp);
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extern void backlight_device_unregister(struct backlight_device *bd);
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#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)
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#endif
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