1 /*- 2 * Copyright (c) 2020 The FreeBSD Foundation 3 * 4 * This software was developed by Emmanuel Vadot under sponsorship 5 * from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _LINUX_BACKLIGHT_H_ 32 #define _LINUX_BACKLIGHT_H_ 33 34 #include <linux/notifier.h> 35 36 struct backlight_device; 37 38 enum backlight_type { 39 BACKLIGHT_RAW = 0, 40 }; 41 42 struct backlight_properties { 43 int type; 44 int max_brightness; 45 int brightness; 46 int power; 47 }; 48 49 enum backlight_notification { 50 BACKLIGHT_REGISTERED, 51 BACKLIGHT_UNREGISTERED, 52 }; 53 54 enum backlight_update_reason { 55 BACKLIGHT_UPDATE_HOTKEY = 0 56 }; 57 58 struct backlight_ops { 59 int options; 60 #define BL_CORE_SUSPENDRESUME 1 61 int (*update_status)(struct backlight_device *); 62 int (*get_brightness)(struct backlight_device *); 63 }; 64 65 struct backlight_device { 66 const struct backlight_ops *ops; 67 struct backlight_properties props; 68 void *data; 69 struct device *dev; 70 char *name; 71 }; 72 73 #define bl_get_data(bd) (bd)->data 74 75 struct backlight_device *linux_backlight_device_register(const char *name, 76 struct device *dev, void *data, const struct backlight_ops *ops, struct backlight_properties *props); 77 void linux_backlight_device_unregister(struct backlight_device *bd); 78 #define backlight_device_register(name, dev, data, ops, props) \ 79 linux_backlight_device_register(name, dev, data, ops, props) 80 #define backlight_device_unregister(bd) linux_backlight_device_unregister(bd) 81 82 static inline int 83 backlight_update_status(struct backlight_device *bd) 84 { 85 return (bd->ops->update_status(bd)); 86 } 87 88 static inline void 89 backlight_force_update(struct backlight_device *bd, int reason) 90 { 91 bd->props.brightness = bd->ops->get_brightness(bd); 92 } 93 94 static inline int 95 backlight_enable(struct backlight_device *bd) 96 { 97 if (bd == NULL) 98 return (0); 99 bd->props.power = 0/* FB_BLANK_UNBLANK */; 100 return (backlight_update_status(bd)); 101 } 102 103 static inline int 104 backlight_disable(struct backlight_device *bd) 105 { 106 if (bd == NULL) 107 return (0); 108 bd->props.power = 4/* FB_BLANK_POWERDOWN */; 109 return (backlight_update_status(bd)); 110 } 111 112 #endif /* _LINUX_BACKLIGHT_H_ */ 113