1 // SPDX-License-Identifier: GPL-2.0-only
3  * Backlight driver for Marvell Semiconductor 88PM8606
16 #include <linux/backlight.h>
30 	int	pwm;  member
40 	int ret = -EINVAL;  in backlight_power_set()
62 	struct pm860x_chip *chip = data->chip;  in pm860x_backlight_set()
72 		backlight_power_set(chip, data->port, 1);  in pm860x_backlight_set()
74 	ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value);  in pm860x_backlight_set()
78 	if ((data->current_brightness == 0) && brightness) {  in pm860x_backlight_set()
79 		if (data->iset) {  in pm860x_backlight_set()
80 			ret = pm860x_set_bits(data->i2c, data->reg_current,  in pm860x_backlight_set()
81 					      CURRENT_BITMASK, data->iset);  in pm860x_backlight_set()
85 		if (data->pwm) {  in pm860x_backlight_set()
86 			ret = pm860x_set_bits(data->i2c, PM8606_PWM,  in pm860x_backlight_set()
87 					      PM8606_PWM_FREQ_MASK, data->pwm);  in pm860x_backlight_set()
93 			ret = pm860x_set_bits(data->i2c, data->reg_always_on,  in pm860x_backlight_set()
99 			ret = pm860x_set_bits(data->i2c, data->reg_always_on,  in pm860x_backlight_set()
103 			ret = pm860x_set_bits(data->i2c, data->reg_always_on,  in pm860x_backlight_set()
111 		backlight_power_set(chip, data->port, 0);  in pm860x_backlight_set()
113 	dev_dbg(chip->dev, "set brightness %d\n", value);  in pm860x_backlight_set()
114 	data->current_brightness = value;  in pm860x_backlight_set()
117 	dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n",  in pm860x_backlight_set()
130 	struct pm860x_chip *chip = data->chip;  in pm860x_backlight_get_brightness()
133 	ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle);  in pm860x_backlight_get_brightness()
136 	data->current_brightness = ret;  in pm860x_backlight_get_brightness()
137 	dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);  in pm860x_backlight_get_brightness()
138 	return data->current_brightness;  in pm860x_backlight_get_brightness()
140 	return -EINVAL;  in pm860x_backlight_get_brightness()
157 	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights");  in pm860x_backlight_dt_init()
159 		dev_err(&pdev->dev, "failed to find backlights node\n");  in pm860x_backlight_dt_init()
160 		return -ENODEV;  in pm860x_backlight_dt_init()
164 			of_property_read_u32(np, "marvell,88pm860x-iset",  in pm860x_backlight_dt_init()
166 			data->iset = PM8606_WLED_CURRENT(iset);  in pm860x_backlight_dt_init()
167 			of_property_read_u32(np, "marvell,88pm860x-pwm",  in pm860x_backlight_dt_init()
168 					     &data->pwm);  in pm860x_backlight_dt_init()
177 #define pm860x_backlight_dt_init(x, y, z)	(-1)
182 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);  in pm860x_backlight_probe()
183 	struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);  in pm860x_backlight_probe()
191 	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),  in pm860x_backlight_probe()
194 		return -ENOMEM;  in pm860x_backlight_probe()
197 		dev_err(&pdev->dev, "No REG resource for duty cycle\n");  in pm860x_backlight_probe()
198 		return -ENXIO;  in pm860x_backlight_probe()
200 	data->reg_duty_cycle = res->start;  in pm860x_backlight_probe()
203 		dev_err(&pdev->dev, "No REG resource for always on\n");  in pm860x_backlight_probe()
204 		return -ENXIO;  in pm860x_backlight_probe()
206 	data->reg_always_on = res->start;  in pm860x_backlight_probe()
209 		dev_err(&pdev->dev, "No REG resource for current\n");  in pm860x_backlight_probe()
210 		return -ENXIO;  in pm860x_backlight_probe()
212 	data->reg_current = res->start;  in pm860x_backlight_probe()
215 	sprintf(name, "backlight-%d", pdev->id);  in pm860x_backlight_probe()
216 	data->port = pdev->id;  in pm860x_backlight_probe()
217 	data->chip = chip;  in pm860x_backlight_probe()
218 	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;  in pm860x_backlight_probe()
219 	data->current_brightness = MAX_BRIGHTNESS;  in pm860x_backlight_probe()
222 			data->pwm = pdata->pwm;  in pm860x_backlight_probe()
223 			data->iset = pdata->iset;  in pm860x_backlight_probe()
230 	bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data,  in pm860x_backlight_probe()
233 		dev_err(&pdev->dev, "failed to register backlight\n");  in pm860x_backlight_probe()
236 	bl->props.brightness = MAX_BRIGHTNESS;  in pm860x_backlight_probe()
240 	/* read current backlight */  in pm860x_backlight_probe()
251 		.name	= "88pm860x-backlight",
258 MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
261 MODULE_ALIAS("platform:88pm860x-backlight");