1 // SPDX-License-Identifier: GPL-2.0+
3 // Driver for Panasonic AN30259A 3-channel LED driver
24 #define AN30259A_LED_EN(x) BIT((x) - 1)
25 #define AN30259A_LED_SLOPE(x) BIT(((x) - 1) + 4)
27 #define AN30259A_REG_LEDCC(x) (0x03 + ((x) - 1))
30 #define AN30259A_REG_SLOPE(x) (0x06 + ((x) - 1))
34 #define AN30259A_REG_LEDCNT1(x) (0x09 + (4 * ((x) - 1)))
38 #define AN30259A_REG_LEDCNT2(x) (0x0A + (4 * ((x) - 1)))
43 #define AN30259A_REG_LEDCNT3(x) (0x0B + (4 * ((x) - 1)))
47 #define AN30259A_REG_LEDCNT4(x) (0x0C + (4 * ((x) - 1)))
65 	struct an30259a *chip;  member
89 	mutex_lock(&led->chip->mutex);  in an30259a_brightness_set()
91 	ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);  in an30259a_brightness_set()
97 		led_on &= ~AN30259A_LED_EN(led->num);  in an30259a_brightness_set()
98 		led_on &= ~AN30259A_LED_SLOPE(led->num);  in an30259a_brightness_set()
99 		led->sloping = false;  in an30259a_brightness_set()
102 		led_on |= AN30259A_LED_EN(led->num);  in an30259a_brightness_set()
103 		if (led->sloping)  in an30259a_brightness_set()
104 			led_on |= AN30259A_LED_SLOPE(led->num);  in an30259a_brightness_set()
105 		ret = regmap_write(led->chip->regmap,  in an30259a_brightness_set()
106 				   AN30259A_REG_LEDCNT1(led->num),  in an30259a_brightness_set()
114 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);  in an30259a_brightness_set()
118 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCC(led->num),  in an30259a_brightness_set()
122 	mutex_unlock(&led->chip->mutex);  in an30259a_brightness_set()
133 	unsigned long off = *delay_off, on = *delay_on;  in an30259a_blink_set()  local
137 	mutex_lock(&led->chip->mutex);  in an30259a_blink_set()
138 	num = led->num;  in an30259a_blink_set()
141 	if (off % AN30259A_SLOPE_RESOLUTION || on % AN30259A_SLOPE_RESOLUTION) {  in an30259a_blink_set()
142 		ret = -EINVAL;  in an30259a_blink_set()
147 	if (off > AN30259A_BLINK_MAX_TIME || on > AN30259A_BLINK_MAX_TIME) {  in an30259a_blink_set()
148 		ret = -EINVAL;  in an30259a_blink_set()
153 	if (!off && !on) {  in an30259a_blink_set()
155 		*delay_on = on = 500;  in an30259a_blink_set()
160 	on /= AN30259A_SLOPE_RESOLUTION;  in an30259a_blink_set()
163 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT2(num),  in an30259a_blink_set()
169 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT3(num),  in an30259a_blink_set()
173 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LEDCNT4(num),  in an30259a_blink_set()
178 	/* slope time controls on/off cycle length. */  in an30259a_blink_set()
179 	ret = regmap_write(led->chip->regmap, AN30259A_REG_SLOPE(num),  in an30259a_blink_set()
181 			   AN30259A_LED_SLOPETIME2(on));  in an30259a_blink_set()
186 	ret = regmap_read(led->chip->regmap, AN30259A_REG_LED_ON, &led_on);  in an30259a_blink_set()
190 	led_on |= AN30259A_LED_SLOPE(num) | AN30259A_LED_EN(led->num);  in an30259a_blink_set()
192 	ret = regmap_write(led->chip->regmap, AN30259A_REG_LED_ON, led_on);  in an30259a_blink_set()
195 		led->sloping = true;  in an30259a_blink_set()
197 	mutex_unlock(&led->chip->mutex);  in an30259a_blink_set()
203 			    struct an30259a *chip)  in an30259a_dt_init()  argument
205 	struct device_node *np = dev_of_node(&client->dev), *child;  in an30259a_dt_init()
213 		return -EINVAL;  in an30259a_dt_init()
220 			dev_err(&client->dev, "Couldn't read LED address: %d\n",  in an30259a_dt_init()
222 			count--;  in an30259a_dt_init()
226 		led = &chip->leds[i];  in an30259a_dt_init()
228 		led->num = source;  in an30259a_dt_init()
229 		led->chip = chip;  in an30259a_dt_init()
230 		led->fwnode = of_fwnode_handle(child);  in an30259a_dt_init()
232 		if (!of_property_read_string(child, "default-state", &str)) {  in an30259a_dt_init()
233 			if (!strcmp(str, "on"))  in an30259a_dt_init()
234 				led->default_state = STATE_ON;  in an30259a_dt_init()
236 				led->default_state = STATE_KEEP;  in an30259a_dt_init()
238 				led->default_state = STATE_OFF;  in an30259a_dt_init()
245 		return -EINVAL;  in an30259a_dt_init()
247 	chip->num_leds = i;  in an30259a_dt_init()
260 	struct an30259a *chip = led->chip;  in an30259a_init_default_state()  local
263 	switch (led->default_state) {  in an30259a_init_default_state()
265 		led->cdev.brightness = LED_FULL;  in an30259a_init_default_state()
268 		err = regmap_read(chip->regmap, AN30259A_REG_LED_ON, &led_on);  in an30259a_init_default_state()
272 		if (!(led_on & AN30259A_LED_EN(led->num))) {  in an30259a_init_default_state()
273 			led->cdev.brightness = LED_OFF;  in an30259a_init_default_state()
276 		regmap_read(chip->regmap, AN30259A_REG_LEDCC(led->num),  in an30259a_init_default_state()
277 			    &led->cdev.brightness);  in an30259a_init_default_state()
280 		led->cdev.brightness = LED_OFF;  in an30259a_init_default_state()
283 	an30259a_brightness_set(&led->cdev, led->cdev.brightness);  in an30259a_init_default_state()
288 	struct an30259a *chip;  in an30259a_probe()  local
291 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);  in an30259a_probe()
292 	if (!chip)  in an30259a_probe()
293 		return -ENOMEM;  in an30259a_probe()
295 	err = an30259a_dt_init(client, chip);  in an30259a_probe()
299 	mutex_init(&chip->mutex);  in an30259a_probe()
300 	chip->client = client;  in an30259a_probe()
301 	i2c_set_clientdata(client, chip);  in an30259a_probe()
303 	chip->regmap = devm_regmap_init_i2c(client, &an30259a_regmap_config);  in an30259a_probe()
305 	if (IS_ERR(chip->regmap)) {  in an30259a_probe()
306 		err = PTR_ERR(chip->regmap);  in an30259a_probe()
307 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in an30259a_probe()
312 	for (i = 0; i < chip->num_leds; i++) {  in an30259a_probe()
315 		an30259a_init_default_state(&chip->leds[i]);  in an30259a_probe()
316 		chip->leds[i].cdev.brightness_set_blocking =  in an30259a_probe()
318 		chip->leds[i].cdev.blink_set = an30259a_blink_set;  in an30259a_probe()
320 		init_data.fwnode = chip->leds[i].fwnode;  in an30259a_probe()
324 		err = devm_led_classdev_register_ext(&client->dev,  in an30259a_probe()
325 						 &chip->leds[i].cdev,  in an30259a_probe()
333 	mutex_destroy(&chip->mutex);  in an30259a_probe()
339 	struct an30259a *chip = i2c_get_clientdata(client);  in an30259a_remove()  local
341 	mutex_destroy(&chip->mutex);  in an30259a_remove()
359 		.name = "leds-an30259a",