1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <dt-bindings/leds/rt4831-backlight.h>
42 	int brightness = backlight_get_brightness(bl_dev);  in rt4831_bl_update_status()  local
43 	unsigned int enable = brightness ? RT4831_BLEN_MASK : 0;  in rt4831_bl_update_status()
47 	if (brightness) {  in rt4831_bl_update_status()
48 		v[0] = (brightness - 1) & RT4831_BLDIML_MASK;  in rt4831_bl_update_status()
49 		v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT;  in rt4831_bl_update_status()
51 		ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));  in rt4831_bl_update_status()
56 	return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable);  in rt4831_bl_update_status()
67 	ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val);  in rt4831_bl_get_brightness()
74 	ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));  in rt4831_bl_get_brightness()
92 	struct device *dev = priv->dev;  in rt4831_parse_backlight_properties()
94 	u32 brightness, ocp_uA;  in rt4831_parse_backlight_properties()  local
99 	ret = device_property_read_u32(dev, "max-brightness", &brightness);  in rt4831_parse_backlight_properties()
101 		brightness = RT4831_BLMAX_BRIGHTNESS;  in rt4831_parse_backlight_properties()
103 	bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS);  in rt4831_parse_backlight_properties()
105 	ret = device_property_read_u32(dev, "default-brightness", &brightness);  in rt4831_parse_backlight_properties()
107 		brightness = bl_props->max_brightness;  in rt4831_parse_backlight_properties()
109 	bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness);  in rt4831_parse_backlight_properties()
112 	if (device_property_read_bool(dev, "richtek,pwm-enable"))  in rt4831_parse_backlight_properties()
115 	ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val);  in rt4831_parse_backlight_properties()
119 	ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval);  in rt4831_parse_backlight_properties()
124 	ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK,  in rt4831_parse_backlight_properties()
131 	 * If inductor peak current reach the level, low-side MOSFET will be  in rt4831_parse_backlight_properties()
136 	 * Not like the OVP level, the default 21V can be used in the most  in rt4831_parse_backlight_properties()
141 	ret = device_property_read_u32(dev, "richtek,bled-ocp-microamp",  in rt4831_parse_backlight_properties()
146 		val = DIV_ROUND_UP(ocp_uA - RT4831_BLOCP_MINUA,  in rt4831_parse_backlight_properties()
148 		ret = regmap_update_bits(priv->regmap, RT4831_REG_BLOPT2,  in rt4831_parse_backlight_properties()
154 	ret = device_property_read_u8(dev, "richtek,channel-use", &propval);  in rt4831_parse_backlight_properties()
156 		dev_err(dev, "richtek,channel-use DT property missing\n");  in rt4831_parse_backlight_properties()
162 		return -EINVAL;  in rt4831_parse_backlight_properties()
165 	return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval);  in rt4831_parse_backlight_properties()
175 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in rt4831_bl_probe()
177 		return -ENOMEM;  in rt4831_bl_probe()
179 	priv->dev = &pdev->dev;  in rt4831_bl_probe()
181 	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in rt4831_bl_probe()
182 	if (!priv->regmap) {  in rt4831_bl_probe()
183 		dev_err(&pdev->dev, "Failed to init regmap\n");  in rt4831_bl_probe()
184 		return -ENODEV;  in rt4831_bl_probe()
189 		dev_err(&pdev->dev, "Failed to parse backlight properties\n");  in rt4831_bl_probe()
193 	priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv,  in rt4831_bl_probe()
195 	if (IS_ERR(priv->bl)) {  in rt4831_bl_probe()
196 		dev_err(&pdev->dev, "Failed to register backlight\n");  in rt4831_bl_probe()
197 		return PTR_ERR(priv->bl);  in rt4831_bl_probe()
200 	backlight_update_status(priv->bl);  in rt4831_bl_probe()
209 	struct backlight_device *bl_dev = priv->bl;  in rt4831_bl_remove()
211 	bl_dev->props.brightness = 0;  in rt4831_bl_remove()
212 	backlight_update_status(priv->bl);  in rt4831_bl_remove()
216 	{ .compatible = "richtek,rt4831-backlight", },
223 		.name = "rt4831-backlight",