1 // SPDX-License-Identifier: GPL-2.0-only
7  *   Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
35 /* The via-pmu code allows the backlight to be grabbed, in which case the
36  * in-kernel control of the brightness needs to be disabled. This should
64 				"backlight-control", NULL);  in pmac_has_backlight_type()
77 	int level = (FB_BACKLIGHT_LEVELS - 1);  in pmac_backlight_curve_lookup()  local
79 	if (info && info->bl_dev) {  in pmac_backlight_curve_lookup()
84 			max = max((int)info->bl_curve[i], max);  in pmac_backlight_curve_lookup()
88 			int diff = abs(info->bl_curve[i] - value);  in pmac_backlight_curve_lookup()
91 				level = i;  in pmac_backlight_curve_lookup()
97 	return level;  in pmac_backlight_curve_lookup()
108 		int brightness;  in pmac_backlight_key_worker()  local
110 		props = &pmac_backlight->props;  in pmac_backlight_key_worker()
112 		brightness = props->brightness +  in pmac_backlight_key_worker()
113 			((pmac_backlight_key_queued?-1:1) *  in pmac_backlight_key_worker()
114 			 (props->max_brightness / 15));  in pmac_backlight_key_worker()
116 		if (brightness < 0)  in pmac_backlight_key_worker()
117 			brightness = 0;  in pmac_backlight_key_worker()
118 		else if (brightness > props->max_brightness)  in pmac_backlight_key_worker()
119 			brightness = props->max_brightness;  in pmac_backlight_key_worker()
121 		props->brightness = brightness;  in pmac_backlight_key_worker()
140 static int __pmac_backlight_set_legacy_brightness(int brightness)  in __pmac_backlight_set_legacy_brightness()  argument
142 	int error = -ENXIO;  in __pmac_backlight_set_legacy_brightness()
148 		props = &pmac_backlight->props;  in __pmac_backlight_set_legacy_brightness()
149 		props->brightness = brightness *  in __pmac_backlight_set_legacy_brightness()
150 			(props->max_brightness + 1) /  in __pmac_backlight_set_legacy_brightness()
153 		if (props->brightness > props->max_brightness)  in __pmac_backlight_set_legacy_brightness()
154 			props->brightness = props->max_brightness;  in __pmac_backlight_set_legacy_brightness()
155 		else if (props->brightness < 0)  in __pmac_backlight_set_legacy_brightness()
156 			props->brightness = 0;  in __pmac_backlight_set_legacy_brightness()
176 void pmac_backlight_set_legacy_brightness_pmu(int brightness) {  in pmac_backlight_set_legacy_brightness_pmu()  argument
180 	pmac_backlight_set_legacy_queued = brightness;  in pmac_backlight_set_legacy_brightness_pmu()
184 int pmac_backlight_set_legacy_brightness(int brightness)  in pmac_backlight_set_legacy_brightness()  argument
186 	return __pmac_backlight_set_legacy_brightness(brightness);  in pmac_backlight_set_legacy_brightness()
191 	int result = -ENXIO;  in pmac_backlight_get_legacy_brightness()
197 		props = &pmac_backlight->props;  in pmac_backlight_get_legacy_brightness()
199 		result = props->brightness *  in pmac_backlight_get_legacy_brightness()
201 			(props->max_brightness + 1);  in pmac_backlight_get_legacy_brightness()