1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <dt-bindings/leds/rt4831-backlight.h>
42 		v[0] = (brightness - 1) & RT4831_BLDIML_MASK;  in rt4831_bl_update_status()
43 		v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT;  in rt4831_bl_update_status()
45 		ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));  in rt4831_bl_update_status()
50 	return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable);  in rt4831_bl_update_status()
61 	ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val);  in rt4831_bl_get_brightness()
68 	ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));  in rt4831_bl_get_brightness()
86 	struct device *dev = priv->dev;  in rt4831_parse_backlight_properties()
93 	ret = device_property_read_u32(dev, "max-brightness", &brightness);  in rt4831_parse_backlight_properties()
97 	bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS);  in rt4831_parse_backlight_properties()
99 	ret = device_property_read_u32(dev, "default-brightness", &brightness);  in rt4831_parse_backlight_properties()
101 		brightness = bl_props->max_brightness;  in rt4831_parse_backlight_properties()
103 	bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness);  in rt4831_parse_backlight_properties()
106 	if (device_property_read_bool(dev, "richtek,pwm-enable"))  in rt4831_parse_backlight_properties()
109 	ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val);  in rt4831_parse_backlight_properties()
113 	ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval);  in rt4831_parse_backlight_properties()
118 	ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK,  in rt4831_parse_backlight_properties()
123 	ret = device_property_read_u8(dev, "richtek,channel-use", &propval);  in rt4831_parse_backlight_properties()
125 		dev_err(dev, "richtek,channel-use DT property missing\n");  in rt4831_parse_backlight_properties()
131 		return -EINVAL;  in rt4831_parse_backlight_properties()
134 	return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval);  in rt4831_parse_backlight_properties()
144 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in rt4831_bl_probe()
146 		return -ENOMEM;  in rt4831_bl_probe()
148 	priv->dev = &pdev->dev;  in rt4831_bl_probe()
150 	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in rt4831_bl_probe()
151 	if (!priv->regmap) {  in rt4831_bl_probe()
152 		dev_err(&pdev->dev, "Failed to init regmap\n");  in rt4831_bl_probe()
153 		return -ENODEV;  in rt4831_bl_probe()
158 		dev_err(&pdev->dev, "Failed to parse backlight properties\n");  in rt4831_bl_probe()
162 	priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv,  in rt4831_bl_probe()
164 	if (IS_ERR(priv->bl)) {  in rt4831_bl_probe()
165 		dev_err(&pdev->dev, "Failed to register backlight\n");  in rt4831_bl_probe()
166 		return PTR_ERR(priv->bl);  in rt4831_bl_probe()
169 	backlight_update_status(priv->bl);  in rt4831_bl_probe()
178 	struct backlight_device *bl_dev = priv->bl;  in rt4831_bl_remove()
180 	bl_dev->props.brightness = 0;  in rt4831_bl_remove()
181 	backlight_update_status(priv->bl);  in rt4831_bl_remove()
187 	{ .compatible = "richtek,rt4831-backlight", },
194 		.name = "rt4831-backlight",