1 // SPDX-License-Identifier: GPL-2.0
2 // TI LM3692x LED chip family driver
3 // Copyright (C) 2017-18 Texas Instruments Incorporated - https://www.ti.com/
18 #define LM36923_MODEL	1
36 #define LM3692X_LED1_EN		BIT(1)
45 #define LM3692X_RAMP_RATE_250us	BIT(1)
47 #define LM3692X_RAMP_RATE_1ms	(BIT(1) | BIT(2))
49 #define LM3692X_RAMP_RATE_4ms	(BIT(3) | BIT(1))
51 #define LM3692X_RAMP_RATE_16ms	(BIT(1) | BIT(2) | BIT(3))
61 #define LM3692X_PWM_FILTER_150	BIT(1)
62 #define LM3692X_PWM_FILTER_200	(BIT(0) | BIT(1))
75 #define LM3692X_OCP_PROT_1_25A	BIT(1)
76 #define LM3692X_OCP_PROT_1_5A	(BIT(0) | BIT(1))
86 #define LM3692X_FAULT_CTRL_OCP BIT(1)
92 #define LM3692X_FAULT_FLAG_OCP BIT(1)
101  * @led_dev: LED class device pointer
104  * @regulator: LED supply regulator pointer
105  * @led_enable: LED sync to be enabled
145 static int lm3692x_fault_check(struct lm3692x_led *led)  in lm3692x_fault_check()  argument
150 	ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);  in lm3692x_fault_check()
155 		dev_err(&led->client->dev, "Detected a fault 0x%X\n", read_buf);  in lm3692x_fault_check()
160 	regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);  in lm3692x_fault_check()
162 		dev_err(&led->client->dev, "Second read of fault flags 0x%X\n",  in lm3692x_fault_check()
168 static int lm3692x_leds_enable(struct lm3692x_led *led)  in lm3692x_leds_enable()  argument
173 	if (led->enabled)  in lm3692x_leds_enable()
176 	if (led->regulator) {  in lm3692x_leds_enable()
177 		ret = regulator_enable(led->regulator);  in lm3692x_leds_enable()
179 			dev_err(&led->client->dev,  in lm3692x_leds_enable()
185 	if (led->enable_gpio)  in lm3692x_leds_enable()
186 		gpiod_direction_output(led->enable_gpio, 1);  in lm3692x_leds_enable()
188 	ret = lm3692x_fault_check(led);  in lm3692x_leds_enable()
190 		dev_err(&led->client->dev, "Cannot read/clear faults: %d\n",  in lm3692x_leds_enable()
195 	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00);  in lm3692x_leds_enable()
202 	 * bit is set to 1.  in lm3692x_leds_enable()
205 	ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN);  in lm3692x_leds_enable()
212 	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);  in lm3692x_leds_enable()
216 	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);  in lm3692x_leds_enable()
220 	ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,  in lm3692x_leds_enable()
225 	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, led->boost_ctrl);  in lm3692x_leds_enable()
229 	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00);  in lm3692x_leds_enable()
233 	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00);  in lm3692x_leds_enable()
237 	ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00);  in lm3692x_leds_enable()
241 	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,  in lm3692x_leds_enable()
246 	switch (led->led_enable) {  in lm3692x_leds_enable()
249 		if (led->model_id == LM36923_MODEL)  in lm3692x_leds_enable()
256 	case 1:  in lm3692x_leds_enable()
264 		if (led->model_id == LM36923_MODEL) {  in lm3692x_leds_enable()
269 		ret = -EINVAL;  in lm3692x_leds_enable()
270 		dev_err(&led->client->dev,  in lm3692x_leds_enable()
275 	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,  in lm3692x_leds_enable()
278 	led->enabled = true;  in lm3692x_leds_enable()
281 	dev_err(&led->client->dev, "Fail writing initialization values\n");  in lm3692x_leds_enable()
283 	if (led->enable_gpio)  in lm3692x_leds_enable()
284 		gpiod_direction_output(led->enable_gpio, 0);  in lm3692x_leds_enable()
286 	if (led->regulator) {  in lm3692x_leds_enable()
287 		reg_ret = regulator_disable(led->regulator);  in lm3692x_leds_enable()
289 			dev_err(&led->client->dev,  in lm3692x_leds_enable()
296 static int lm3692x_leds_disable(struct lm3692x_led *led)  in lm3692x_leds_disable()  argument
300 	if (!led->enabled)  in lm3692x_leds_disable()
303 	ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);  in lm3692x_leds_disable()
305 		dev_err(&led->client->dev, "Failed to disable regulator: %d\n",  in lm3692x_leds_disable()
310 	if (led->enable_gpio)  in lm3692x_leds_disable()
311 		gpiod_direction_output(led->enable_gpio, 0);  in lm3692x_leds_disable()
313 	if (led->regulator) {  in lm3692x_leds_disable()
314 		ret = regulator_disable(led->regulator);  in lm3692x_leds_disable()
316 			dev_err(&led->client->dev,  in lm3692x_leds_disable()
320 	led->enabled = false;  in lm3692x_leds_disable()
327 	struct lm3692x_led *led =  in lm3692x_brightness_set()  local
332 	mutex_lock(&led->lock);  in lm3692x_brightness_set()
335 		ret = lm3692x_leds_disable(led);  in lm3692x_brightness_set()
338 		lm3692x_leds_enable(led);  in lm3692x_brightness_set()
341 	ret = lm3692x_fault_check(led);  in lm3692x_brightness_set()
343 		dev_err(&led->client->dev, "Cannot read/clear faults: %d\n",  in lm3692x_brightness_set()
348 	ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val);  in lm3692x_brightness_set()
350 		dev_err(&led->client->dev, "Cannot write MSB: %d\n", ret);  in lm3692x_brightness_set()
354 	ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb);  in lm3692x_brightness_set()
356 		dev_err(&led->client->dev, "Cannot write LSB: %d\n", ret);  in lm3692x_brightness_set()
360 	mutex_unlock(&led->lock);  in lm3692x_brightness_set()
364 static enum led_brightness lm3692x_max_brightness(struct lm3692x_led *led,  in lm3692x_max_brightness()  argument
370 	max_code = ((max_cur * 1000) - 37806) / 12195;  in lm3692x_max_brightness()
377 static int lm3692x_probe_dt(struct lm3692x_led *led)  in lm3692x_probe_dt()  argument
384 	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,  in lm3692x_probe_dt()
386 	if (IS_ERR(led->enable_gpio)) {  in lm3692x_probe_dt()
387 		ret = PTR_ERR(led->enable_gpio);  in lm3692x_probe_dt()
388 		dev_err(&led->client->dev, "Failed to get enable gpio: %d\n",  in lm3692x_probe_dt()
393 	led->regulator = devm_regulator_get_optional(&led->client->dev, "vled");  in lm3692x_probe_dt()
394 	if (IS_ERR(led->regulator)) {  in lm3692x_probe_dt()
395 		ret = PTR_ERR(led->regulator);  in lm3692x_probe_dt()
396 		if (ret != -ENODEV)  in lm3692x_probe_dt()
397 			return dev_err_probe(&led->client->dev, ret,  in lm3692x_probe_dt()
400 		led->regulator = NULL;  in lm3692x_probe_dt()
403 	led->boost_ctrl = LM3692X_BOOST_SW_1MHZ |  in lm3692x_probe_dt()
406 	ret = device_property_read_u32(&led->client->dev,  in lm3692x_probe_dt()
407 				       "ti,ovp-microvolt", &ovp);  in lm3692x_probe_dt()
409 		led->boost_ctrl |= LM3692X_OVP_29V;  in lm3692x_probe_dt()
415 			led->boost_ctrl |= LM3692X_OVP_21V;  in lm3692x_probe_dt()
418 			led->boost_ctrl |= LM3692X_OVP_25V;  in lm3692x_probe_dt()
421 			led->boost_ctrl |= LM3692X_OVP_29V;  in lm3692x_probe_dt()
424 			dev_err(&led->client->dev, "Invalid OVP %d\n", ovp);  in lm3692x_probe_dt()
425 			return -EINVAL;  in lm3692x_probe_dt()
429 	child = device_get_next_child_node(&led->client->dev, child);  in lm3692x_probe_dt()
431 		dev_err(&led->client->dev, "No LED Child node\n");  in lm3692x_probe_dt()
432 		return -ENODEV;  in lm3692x_probe_dt()
435 	ret = fwnode_property_read_u32(child, "reg", &led->led_enable);  in lm3692x_probe_dt()
438 		dev_err(&led->client->dev, "reg DT property missing\n");  in lm3692x_probe_dt()
442 	ret = fwnode_property_read_u32(child, "led-max-microamp", &max_cur);  in lm3692x_probe_dt()
443 	led->led_dev.max_brightness = ret ? LED_FULL :  in lm3692x_probe_dt()
444 		lm3692x_max_brightness(led, max_cur);  in lm3692x_probe_dt()
447 	init_data.devicename = led->client->name;  in lm3692x_probe_dt()
450 	ret = devm_led_classdev_register_ext(&led->client->dev, &led->led_dev,  in lm3692x_probe_dt()
453 		dev_err(&led->client->dev, "led register err: %d\n", ret);  in lm3692x_probe_dt()
462 	struct lm3692x_led *led;  in lm3692x_probe()  local
465 	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);  in lm3692x_probe()
466 	if (!led)  in lm3692x_probe()
467 		return -ENOMEM;  in lm3692x_probe()
469 	mutex_init(&led->lock);  in lm3692x_probe()
470 	led->client = client;  in lm3692x_probe()
471 	led->led_dev.brightness_set_blocking = lm3692x_brightness_set;  in lm3692x_probe()
472 	led->model_id = id->driver_data;  in lm3692x_probe()
473 	i2c_set_clientdata(client, led);  in lm3692x_probe()
475 	led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);  in lm3692x_probe()
476 	if (IS_ERR(led->regmap)) {  in lm3692x_probe()
477 		ret = PTR_ERR(led->regmap);  in lm3692x_probe()
478 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lm3692x_probe()
483 	ret = lm3692x_probe_dt(led);  in lm3692x_probe()
487 	ret = lm3692x_leds_enable(led);  in lm3692x_probe()
496 	struct lm3692x_led *led = i2c_get_clientdata(client);  in lm3692x_remove()  local
498 	lm3692x_leds_disable(led);  in lm3692x_remove()
499 	mutex_destroy(&led->lock);  in lm3692x_remove()
527 MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver");