1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2015-2019 Texas Instruments Incorporated -  http://www.ti.com/
20 	unsigned int		*levels;  member
30 	if (priv->levels)  in led_bl_set_brightness()
31 		bkl_brightness = priv->levels[level];  in led_bl_set_brightness()
35 	for (i = 0; i < priv->nb_leds; i++)  in led_bl_set_brightness()
36 		led_set_brightness(priv->leds[i], bkl_brightness);  in led_bl_set_brightness()
38 	priv->enabled = true;  in led_bl_set_brightness()
45 	if (!priv->enabled)  in led_bl_power_off()
48 	for (i = 0; i < priv->nb_leds; i++)  in led_bl_power_off()
49 		led_set_brightness(priv->leds[i], LED_OFF);  in led_bl_power_off()
51 	priv->enabled = false;  in led_bl_power_off()
57 	int brightness = backlight_get_brightness(bl);  in led_bl_update_status()  local
59 	if (brightness > 0)  in led_bl_update_status()
60 		led_bl_set_brightness(priv, brightness);  in led_bl_update_status()
75 	struct device_node *node = dev->of_node;  in led_bl_get_leds()
83 		return -EINVAL;  in led_bl_get_leds()
89 		return -EINVAL;  in led_bl_get_leds()
95 		return -ENOMEM;  in led_bl_get_leds()
103 	/* check that the LEDs all have the same brightness range */  in led_bl_get_leds()
104 	max_brightness = leds[0]->max_brightness;  in led_bl_get_leds()
106 		if (max_brightness != leds[i]->max_brightness) {  in led_bl_get_leds()
108 			return -EINVAL;  in led_bl_get_leds()
112 	/* get the default brightness from the first LED from the list */  in led_bl_get_leds()
113 	default_brightness = leds[0]->brightness;  in led_bl_get_leds()
115 	priv->nb_leds = nb_leds;  in led_bl_get_leds()
116 	priv->leds = leds;  in led_bl_get_leds()
117 	priv->max_brightness = max_brightness;  in led_bl_get_leds()
118 	priv->default_brightness = default_brightness;  in led_bl_get_leds()
126 	struct device_node *node = dev->of_node;  in led_bl_parse_levels()
132 		return -ENODEV;  in led_bl_parse_levels()
134 	num_levels = of_property_count_u32_elems(node, "brightness-levels");  in led_bl_parse_levels()
138 		u32 *levels = NULL;  in led_bl_parse_levels()  local
140 		levels = devm_kzalloc(dev, sizeof(u32) * num_levels,  in led_bl_parse_levels()
142 		if (!levels)  in led_bl_parse_levels()
143 			return -ENOMEM;  in led_bl_parse_levels()
145 		ret = of_property_read_u32_array(node, "brightness-levels",  in led_bl_parse_levels()
146 						levels,  in led_bl_parse_levels()
152 		 * Try to map actual LED brightness to backlight brightness  in led_bl_parse_levels()
155 		db = priv->default_brightness;  in led_bl_parse_levels()
157 			if ((i && db > levels[i-1]) && db <= levels[i])  in led_bl_parse_levels()
160 		priv->default_brightness = i;  in led_bl_parse_levels()
161 		priv->max_brightness = num_levels - 1;  in led_bl_parse_levels()
162 		priv->levels = levels;  in led_bl_parse_levels()
164 		dev_warn(dev, "Not enough levels defined\n");  in led_bl_parse_levels()
166 	ret = of_property_read_u32(node, "default-brightness-level", &value);  in led_bl_parse_levels()
167 	if (!ret && value <= priv->max_brightness)  in led_bl_parse_levels()
168 		priv->default_brightness = value;  in led_bl_parse_levels()
169 	else if (!ret  && value > priv->max_brightness)  in led_bl_parse_levels()
170 		dev_warn(dev, "Invalid default brightness. Ignoring it\n");  in led_bl_parse_levels()
181 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in led_bl_probe()
183 		return -ENOMEM;  in led_bl_probe()
187 	priv->dev = &pdev->dev;  in led_bl_probe()
189 	ret = led_bl_get_leds(&pdev->dev, priv);  in led_bl_probe()
193 	ret = led_bl_parse_levels(&pdev->dev, priv);  in led_bl_probe()
195 		dev_err(&pdev->dev, "Failed to parse DT data\n");  in led_bl_probe()
201 	props.max_brightness = priv->max_brightness;  in led_bl_probe()
202 	props.brightness = priv->default_brightness;  in led_bl_probe()
203 	props.power = (priv->default_brightness > 0) ? BACKLIGHT_POWER_OFF :  in led_bl_probe()
205 	priv->bl_dev = backlight_device_register(dev_name(&pdev->dev),  in led_bl_probe()
206 			&pdev->dev, priv, &led_bl_ops, &props);  in led_bl_probe()
207 	if (IS_ERR(priv->bl_dev)) {  in led_bl_probe()
208 		dev_err(&pdev->dev, "Failed to register backlight\n");  in led_bl_probe()
209 		return PTR_ERR(priv->bl_dev);  in led_bl_probe()
212 	for (i = 0; i < priv->nb_leds; i++) {  in led_bl_probe()
213 		mutex_lock(&priv->leds[i]->led_access);  in led_bl_probe()
214 		led_sysfs_disable(priv->leds[i]);  in led_bl_probe()
215 		mutex_unlock(&priv->leds[i]->led_access);  in led_bl_probe()
218 	backlight_update_status(priv->bl_dev);  in led_bl_probe()
226 	struct backlight_device *bl = priv->bl_dev;  in led_bl_remove()
232 	for (i = 0; i < priv->nb_leds; i++)  in led_bl_remove()
233 		led_sysfs_enable(priv->leds[i]);  in led_bl_remove()
237 	{ .compatible = "led-backlight" },
245 		.name		= "led-backlight",
256 MODULE_ALIAS("platform:led-backlight");