1 // SPDX-License-Identifier: GPL-2.0-only
3  * sky81452-backlight.c	SKY81452 backlight driver
40 #define SKY81452_DEFAULT_NAME "lcd-backlight"
44  * struct sky81452_bl_platform_data - backlight platform data
46  *		If it is not defined, default name is lcd-backlight.
71 			dev_get_platdata(bd->dev.parent);  in sky81452_bl_update_status()
72 	const unsigned int brightness = (unsigned int)bd->props.brightness;  in sky81452_bl_update_status()
77 		ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);  in sky81452_bl_update_status()
82 					pdata->enable << CTZ(SKY81452_EN));  in sky81452_bl_update_status()
119 	reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;  in sky81452_bl_show_open_short()
155 		strcat(buf, "over-current ");  in sky81452_bl_show_fault()
158 		strcat(buf, "over-temperature");  in sky81452_bl_show_fault()
185 	struct device_node *np = dev->of_node;  in sky81452_bl_parse_dt()
193 		return ERR_PTR(-ENODATA);  in sky81452_bl_parse_dt()
198 		return ERR_PTR(-ENOMEM);  in sky81452_bl_parse_dt()
200 	of_property_read_string(np, "name", &pdata->name);  in sky81452_bl_parse_dt()
201 	pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");  in sky81452_bl_parse_dt()
202 	pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode");  in sky81452_bl_parse_dt()
203 	pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift");  in sky81452_bl_parse_dt()
204 	pdata->gpiod_enable = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);  in sky81452_bl_parse_dt()
206 	ret = of_property_count_u32_elems(np, "led-sources");  in sky81452_bl_parse_dt()
208 		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);  in sky81452_bl_parse_dt()
214 		ret = of_property_read_u32_array(np, "led-sources", sources,  in sky81452_bl_parse_dt()
217 			dev_err(dev, "led-sources node is invalid.\n");  in sky81452_bl_parse_dt()
218 			return ERR_PTR(-EINVAL);  in sky81452_bl_parse_dt()
221 		pdata->enable = 0;  in sky81452_bl_parse_dt()
222 		while (--num_entry)  in sky81452_bl_parse_dt()
223 			pdata->enable |= (1 << sources[num_entry]);  in sky81452_bl_parse_dt()
227 			"skyworks,short-detection-threshold-volt",  in sky81452_bl_parse_dt()
228 			&pdata->short_detection_threshold);  in sky81452_bl_parse_dt()
230 		pdata->short_detection_threshold = 7;  in sky81452_bl_parse_dt()
232 	ret = of_property_read_u32(np, "skyworks,current-limit-mA",  in sky81452_bl_parse_dt()
233 			&pdata->boost_current_limit);  in sky81452_bl_parse_dt()
235 		pdata->boost_current_limit = 2750;  in sky81452_bl_parse_dt()
243 	return ERR_PTR(-EINVAL);  in sky81452_bl_parse_dt()
252 	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;  in sky81452_bl_init_device()
253 	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;  in sky81452_bl_init_device()
254 	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;  in sky81452_bl_init_device()
256 	if (pdata->boost_current_limit == 2300)  in sky81452_bl_init_device()
258 	else if (pdata->boost_current_limit != 2750)  in sky81452_bl_init_device()
259 		return -EINVAL;  in sky81452_bl_init_device()
261 	if (pdata->short_detection_threshold < 4 ||  in sky81452_bl_init_device()
262 				pdata->short_detection_threshold > 7)  in sky81452_bl_init_device()
263 		return -EINVAL;  in sky81452_bl_init_device()
264 	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);  in sky81452_bl_init_device()
271 	struct device *dev = &pdev->dev;  in sky81452_bl_probe()
272 	struct regmap *regmap = dev_get_drvdata(dev->parent);  in sky81452_bl_probe()
291 	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;  in sky81452_bl_probe()
301 	ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);  in sky81452_bl_probe()
313 						dev_get_platdata(&pdev->dev);  in sky81452_bl_remove()
316 	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);  in sky81452_bl_remove()
318 	bd->props.power = BACKLIGHT_POWER_ON;  in sky81452_bl_remove()
319 	bd->props.brightness = 0;  in sky81452_bl_remove()
322 	if (pdata->gpiod_enable)  in sky81452_bl_remove()
323 		gpiod_set_value_cansleep(pdata->gpiod_enable, 0);  in sky81452_bl_remove()
328 	{ .compatible = "skyworks,sky81452-backlight", },
336 		.name = "sky81452-backlight",