1 // SPDX-License-Identifier: GPL-2.0-only
3  * sky81452-backlight.c	SKY81452 backlight driver
40 #define SKY81452_DEFAULT_NAME "lcd-backlight"
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 = of_node_get(dev->of_node);  in sky81452_bl_parse_dt()
188 	unsigned int sources[6];  in sky81452_bl_parse_dt()  local
193 		return ERR_PTR(-ENODATA);  in sky81452_bl_parse_dt()
199 		return ERR_PTR(-ENOMEM);  in sky81452_bl_parse_dt()
202 	of_property_read_string(np, "name", &pdata->name);  in sky81452_bl_parse_dt()
203 	pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");  in sky81452_bl_parse_dt()
204 	pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode");  in sky81452_bl_parse_dt()
205 	pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift");  in sky81452_bl_parse_dt()
206 	pdata->gpiod_enable = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);  in sky81452_bl_parse_dt()
208 	ret = of_property_count_u32_elems(np, "led-sources");  in sky81452_bl_parse_dt()
210 		pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);  in sky81452_bl_parse_dt()
216 		ret = of_property_read_u32_array(np, "led-sources", sources,  in sky81452_bl_parse_dt()
219 			dev_err(dev, "led-sources node is invalid.\n");  in sky81452_bl_parse_dt()
221 			return ERR_PTR(-EINVAL);  in sky81452_bl_parse_dt()
224 		pdata->enable = 0;  in sky81452_bl_parse_dt()
225 		while (--num_entry)  in sky81452_bl_parse_dt()
226 			pdata->enable |= (1 << sources[num_entry]);  in sky81452_bl_parse_dt()
230 			"skyworks,short-detection-threshold-volt",  in sky81452_bl_parse_dt()
231 			&pdata->short_detection_threshold);  in sky81452_bl_parse_dt()
233 		pdata->short_detection_threshold = 7;  in sky81452_bl_parse_dt()
235 	ret = of_property_read_u32(np, "skyworks,current-limit-mA",  in sky81452_bl_parse_dt()
236 			&pdata->boost_current_limit);  in sky81452_bl_parse_dt()
238 		pdata->boost_current_limit = 2750;  in sky81452_bl_parse_dt()
247 	return ERR_PTR(-EINVAL);  in sky81452_bl_parse_dt()
256 	value = pdata->ignore_pwm ? SKY81452_IGPW : 0;  in sky81452_bl_init_device()
257 	value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;  in sky81452_bl_init_device()
258 	value |= pdata->phase_shift ? 0 : SKY81452_PHASE;  in sky81452_bl_init_device()
260 	if (pdata->boost_current_limit == 2300)  in sky81452_bl_init_device()
262 	else if (pdata->boost_current_limit != 2750)  in sky81452_bl_init_device()
263 		return -EINVAL;  in sky81452_bl_init_device()
265 	if (pdata->short_detection_threshold < 4 ||  in sky81452_bl_init_device()
266 				pdata->short_detection_threshold > 7)  in sky81452_bl_init_device()
267 		return -EINVAL;  in sky81452_bl_init_device()
268 	value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);  in sky81452_bl_init_device()
275 	struct device *dev = &pdev->dev;  in sky81452_bl_probe()
276 	struct regmap *regmap = dev_get_drvdata(dev->parent);  in sky81452_bl_probe()
295 	name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;  in sky81452_bl_probe()
305 	ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);  in sky81452_bl_probe()
317 						dev_get_platdata(&pdev->dev);  in sky81452_bl_remove()
320 	sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);  in sky81452_bl_remove()
322 	bd->props.power = FB_BLANK_UNBLANK;  in sky81452_bl_remove()
323 	bd->props.brightness = 0;  in sky81452_bl_remove()
326 	if (pdata->gpiod_enable)  in sky81452_bl_remove()
327 		gpiod_set_value_cansleep(pdata->gpiod_enable, 0);  in sky81452_bl_remove()
334 	{ .compatible = "skyworks,sky81452-backlight", },
342 		.name = "sky81452-backlight",