1 // SPDX-License-Identifier: GPL-2.0-only
4  * https://www.kinet-ic.com/uploads/web/KTD2801/KTD2801-04b.pdf
8 #include <linux/leds-expresswire.h>
36 	u8 brightness = (u8) backlight_get_brightness(bd);  in ktd2801_update_status()  local
39 		expresswire_power_off(&ktd2801->props);  in ktd2801_update_status()
40 		ktd2801->was_on = false;  in ktd2801_update_status()
44 	if (!ktd2801->was_on) {  in ktd2801_update_status()
45 		expresswire_enable(&ktd2801->props);  in ktd2801_update_status()
46 		ktd2801->was_on = true;  in ktd2801_update_status()
49 	expresswire_write_u8(&ktd2801->props, brightness);  in ktd2801_update_status()
60 	struct device *dev = &pdev->dev;  in ktd2801_backlight_probe()
63 	u32 brightness, max_brightness;  in ktd2801_backlight_probe()  local
68 		return -ENOMEM;  in ktd2801_backlight_probe()
69 	ktd2801->was_on = true;  in ktd2801_backlight_probe()
70 	ktd2801->props.timing = ktd2801_timing;  in ktd2801_backlight_probe()
72 	ret = device_property_read_u32(dev, "max-brightness", &max_brightness);  in ktd2801_backlight_probe()
76 		dev_err(dev, "illegal max brightness specified\n");  in ktd2801_backlight_probe()
80 	ret = device_property_read_u32(dev, "default-brightness", &brightness);  in ktd2801_backlight_probe()
82 		brightness = KTD2801_DEFAULT_BRIGHTNESS;  in ktd2801_backlight_probe()
83 	if (brightness > max_brightness) {  in ktd2801_backlight_probe()
84 		dev_err(dev, "default brightness exceeds max\n");  in ktd2801_backlight_probe()
85 		brightness = max_brightness;  in ktd2801_backlight_probe()
88 	ktd2801->props.ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_OUT_HIGH);  in ktd2801_backlight_probe()
89 	if (IS_ERR(ktd2801->props.ctrl_gpio))  in ktd2801_backlight_probe()
90 		return dev_err_probe(dev, PTR_ERR(ktd2801->props.ctrl_gpio),  in ktd2801_backlight_probe()
92 	gpiod_set_consumer_name(ktd2801->props.ctrl_gpio, dev_name(dev));  in ktd2801_backlight_probe()
100 	bd->props.max_brightness = max_brightness;  in ktd2801_backlight_probe()
101 	bd->props.brightness = brightness;  in ktd2801_backlight_probe()
103 	ktd2801->bd = bd;  in ktd2801_backlight_probe()
118 		.name = "ktd2801-backlight",