1 // SPDX-License-Identifier: GPL-2.0-only
7  *   Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
36 /* The via-pmu code allows the backlight to be grabbed, in which case the
37  * in-kernel control of the brightness needs to be disabled. This should
65 				"backlight-control", NULL);  in pmac_has_backlight_type()
78 	int level = (FB_BACKLIGHT_LEVELS - 1);  in pmac_backlight_curve_lookup()
80 	if (info && info->bl_dev) {  in pmac_backlight_curve_lookup()
81 		int i, max = 0;  in pmac_backlight_curve_lookup()  local
85 			max = max((int)info->bl_curve[i], max);  in pmac_backlight_curve_lookup()
89 			int diff = abs(info->bl_curve[i] - value);  in pmac_backlight_curve_lookup()
90 			if (diff < max) {  in pmac_backlight_curve_lookup()
91 				max = diff;  in pmac_backlight_curve_lookup()
109 		int brightness;  in pmac_backlight_key_worker()  local
111 		props = &pmac_backlight->props;  in pmac_backlight_key_worker()
113 		brightness = props->brightness +  in pmac_backlight_key_worker()
114 			((pmac_backlight_key_queued?-1:1) *  in pmac_backlight_key_worker()
115 			 (props->max_brightness / 15));  in pmac_backlight_key_worker()
117 		if (brightness < 0)  in pmac_backlight_key_worker()
118 			brightness = 0;  in pmac_backlight_key_worker()
119 		else if (brightness > props->max_brightness)  in pmac_backlight_key_worker()
120 			brightness = props->max_brightness;  in pmac_backlight_key_worker()
122 		props->brightness = brightness;  in pmac_backlight_key_worker()
141 static int __pmac_backlight_set_legacy_brightness(int brightness)  in __pmac_backlight_set_legacy_brightness()  argument
143 	int error = -ENXIO;  in __pmac_backlight_set_legacy_brightness()
149 		props = &pmac_backlight->props;  in __pmac_backlight_set_legacy_brightness()
150 		props->brightness = brightness *  in __pmac_backlight_set_legacy_brightness()
151 			(props->max_brightness + 1) /  in __pmac_backlight_set_legacy_brightness()
154 		if (props->brightness > props->max_brightness)  in __pmac_backlight_set_legacy_brightness()
155 			props->brightness = props->max_brightness;  in __pmac_backlight_set_legacy_brightness()
156 		else if (props->brightness < 0)  in __pmac_backlight_set_legacy_brightness()
157 			props->brightness = 0;  in __pmac_backlight_set_legacy_brightness()
177 void pmac_backlight_set_legacy_brightness_pmu(int brightness) {  in pmac_backlight_set_legacy_brightness_pmu()  argument
181 	pmac_backlight_set_legacy_queued = brightness;  in pmac_backlight_set_legacy_brightness_pmu()
185 int pmac_backlight_set_legacy_brightness(int brightness)  in pmac_backlight_set_legacy_brightness()  argument
187 	return __pmac_backlight_set_legacy_brightness(brightness);  in pmac_backlight_set_legacy_brightness()
192 	int result = -ENXIO;  in pmac_backlight_get_legacy_brightness()
198 		props = &pmac_backlight->props;  in pmac_backlight_get_legacy_brightness()
200 		result = props->brightness *  in pmac_backlight_get_legacy_brightness()
202 			(props->max_brightness + 1);  in pmac_backlight_get_legacy_brightness()