1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Silergy SY7802 flash LED driver with an I2C interface
11 #include <linux/led-class-flash.h>
111 	struct sy7802_led *led = container_of(lcdev, struct sy7802_led, flash.led_cdev);  in sy7802_torch_brightness_set()  local
112 	struct sy7802 *chip = led->chip;  in sy7802_torch_brightness_set()
120 	mutex_lock(&chip->mutex);  in sy7802_torch_brightness_set()
122 	if (chip->fled_strobe_used) {  in sy7802_torch_brightness_set()
123 		dev_warn(chip->dev, "Cannot set torch brightness whilst strobe is enabled\n");  in sy7802_torch_brightness_set()
124 		ret = -EBUSY;  in sy7802_torch_brightness_set()
129 		fled_torch_used_tmp = chip->fled_torch_used | BIT(led->led_id);  in sy7802_torch_brightness_set()
131 		fled_torch_used_tmp = chip->fled_torch_used & ~BIT(led->led_id);  in sy7802_torch_brightness_set()
133 	led_enable_mask = led->led_id == SY7802_LED_JOINT ?  in sy7802_torch_brightness_set()
135 			  SY7802_LEDS_MASK(led->led_id);  in sy7802_torch_brightness_set()
142 	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, SY7802_MODE_MASK,  in sy7802_torch_brightness_set()
147 	torch_mask = led->led_id == SY7802_LED_JOINT ?  in sy7802_torch_brightness_set()
149 		     SY7802_TORCH_CURRENT_MASK(led->led_id);  in sy7802_torch_brightness_set()
151 	/* Register expects brightness between 0 and MAX_BRIGHTNESS - 1 */  in sy7802_torch_brightness_set()
153 		brightness -= 1;  in sy7802_torch_brightness_set()
157 	ret = regmap_update_bits(chip->regmap, SY7802_REG_TORCH_BRIGHTNESS, torch_mask, brightness);  in sy7802_torch_brightness_set()
162 	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, enable_mask, val);  in sy7802_torch_brightness_set()
166 	chip->fled_torch_used = fled_torch_used_tmp;  in sy7802_torch_brightness_set()
169 	mutex_unlock(&chip->mutex);  in sy7802_torch_brightness_set()
175 	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);  in sy7802_flash_brightness_set()  local
176 	struct led_flash_setting *s = &fl_cdev->brightness;  in sy7802_flash_brightness_set()  local
177 	u32 val = (brightness - s->min) / s->step;  in sy7802_flash_brightness_set()
178 	struct sy7802 *chip = led->chip;  in sy7802_flash_brightness_set()
183 	flash_mask = led->led_id == SY7802_LED_JOINT ?  in sy7802_flash_brightness_set()
185 		     SY7802_FLASH_CURRENT_MASK(led->led_id);  in sy7802_flash_brightness_set()
187 	mutex_lock(&chip->mutex);  in sy7802_flash_brightness_set()
188 	ret = regmap_update_bits(chip->regmap, SY7802_REG_FLASH_BRIGHTNESS, flash_mask, val);  in sy7802_flash_brightness_set()
189 	mutex_unlock(&chip->mutex);  in sy7802_flash_brightness_set()
196 	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);  in sy7802_strobe_set()  local
197 	struct sy7802 *chip = led->chip;  in sy7802_strobe_set()
204 	mutex_lock(&chip->mutex);  in sy7802_strobe_set()
206 	if (chip->fled_torch_used) {  in sy7802_strobe_set()
207 		dev_warn(chip->dev, "Cannot set strobe brightness whilst torch is enabled\n");  in sy7802_strobe_set()
208 		ret = -EBUSY;  in sy7802_strobe_set()
213 		fled_strobe_used_tmp = chip->fled_strobe_used | BIT(led->led_id);  in sy7802_strobe_set()
215 		fled_strobe_used_tmp = chip->fled_strobe_used & ~BIT(led->led_id);  in sy7802_strobe_set()
217 	led_enable_mask = led->led_id == SY7802_LED_JOINT ?  in sy7802_strobe_set()
219 			  SY7802_LEDS_MASK(led->led_id);  in sy7802_strobe_set()
226 	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, enable_mask, val);  in sy7802_strobe_set()
231 	chip->fled_strobe_used = fled_strobe_used_tmp;  in sy7802_strobe_set()
234 	mutex_unlock(&chip->mutex);  in sy7802_strobe_set()
240 	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);  in sy7802_strobe_get()  local
241 	struct sy7802 *chip = led->chip;  in sy7802_strobe_get()
243 	mutex_lock(&chip->mutex);  in sy7802_strobe_get()
244 	*state = !!(chip->fled_strobe_used & BIT(led->led_id));  in sy7802_strobe_get()
245 	mutex_unlock(&chip->mutex);  in sy7802_strobe_get()
252 	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);  in sy7802_timeout_set()  local
253 	struct led_flash_setting *s = &fl_cdev->timeout;  in sy7802_timeout_set()  local
254 	u32 val = (timeout - s->min) / s->step;  in sy7802_timeout_set()
255 	struct sy7802 *chip = led->chip;  in sy7802_timeout_set()
257 	return regmap_write(chip->regmap, SY7802_REG_FLASH_DURATION, val);  in sy7802_timeout_set()
262 	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);  in sy7802_fault_get()  local
263 	struct sy7802 *chip = led->chip;  in sy7802_fault_get()
268 	ret = regmap_read(chip->regmap, SY7802_REG_FLAGS, &val);  in sy7802_fault_get()
295 	struct led_flash_setting *s;  in sy7802_init_flash_brightness()  local
298 	s = &fl_cdev->brightness;  in sy7802_init_flash_brightness()
299 	s->min = SY7802_FLASH_BRIGHTNESS_MIN;  in sy7802_init_flash_brightness()
300 	s->max = SY7802_FLASH_BRIGHTNESS_MAX;  in sy7802_init_flash_brightness()
301 	s->step = SY7802_FLASH_BRIGHTNESS_STEP;  in sy7802_init_flash_brightness()
302 	s->val = SY7802_FLASH_BRIGHTNESS_DEFAULT;  in sy7802_init_flash_brightness()
307 	struct led_flash_setting *s;  in sy7802_init_flash_timeout()  local
310 	s = &fl_cdev->timeout;  in sy7802_init_flash_timeout()
311 	s->min = SY7802_TIMEOUT_MIN_US;  in sy7802_init_flash_timeout()
312 	s->max = SY7802_TIMEOUT_MAX_US;  in sy7802_init_flash_timeout()
313 	s->step = SY7802_TIMEOUT_STEPSIZE_US;  in sy7802_init_flash_timeout()
314 	s->val = SY7802_TIMEOUT_DEFAULT_US;  in sy7802_init_flash_timeout()
317 static int sy7802_led_register(struct device *dev, struct sy7802_led *led,  in sy7802_led_register()  argument
325 	ret = devm_led_classdev_flash_register_ext(dev, &led->flash, &init_data);  in sy7802_led_register()
327 		dev_err(dev, "Couldn't register flash %d\n", led->led_id);  in sy7802_led_register()
334 static int sy7802_init_flash_properties(struct device *dev, struct sy7802_led *led,  in sy7802_init_flash_properties()  argument
337 	struct led_classdev_flash *flash = &led->flash;  in sy7802_init_flash_properties()
338 	struct led_classdev *lcdev = &flash->led_cdev;  in sy7802_init_flash_properties()
342 	num = of_property_count_u32_elems(np, "led-sources");  in sy7802_init_flash_properties()
344 		dev_err(dev, "Not specified or wrong number of led-sources\n");  in sy7802_init_flash_properties()
345 		return -EINVAL;  in sy7802_init_flash_properties()
348 	ret = of_property_read_u32_array(np, "led-sources", sources, num);  in sy7802_init_flash_properties()
354 			return -EINVAL;  in sy7802_init_flash_properties()
355 		if (led->chip->leds_active & BIT(sources[i]))  in sy7802_init_flash_properties()
356 			return -EINVAL;  in sy7802_init_flash_properties()
357 		led->chip->leds_active |= BIT(sources[i]);  in sy7802_init_flash_properties()
360 	/* If both channels are specified in 'led-sources', joint flash output mode is used */  in sy7802_init_flash_properties()
361 	led->led_id = num == 2 ? SY7802_LED_JOINT : sources[0];  in sy7802_init_flash_properties()
363 	lcdev->max_brightness = SY7802_TORCH_BRIGHTNESS_MAX;  in sy7802_init_flash_properties()
364 	lcdev->brightness_set_blocking = sy7802_torch_brightness_set;  in sy7802_init_flash_properties()
365 	lcdev->flags |= LED_DEV_CAP_FLASH;  in sy7802_init_flash_properties()
367 	flash->ops = &sy7802_flash_ops;  in sy7802_init_flash_properties()
377 	struct device *dev = chip->dev;  in sy7802_chip_check()
381 	ret = regmap_read(chip->regmap, SY7802_REG_DEV_ID, &chipid);  in sy7802_chip_check()
386 		return dev_err_probe(dev, -ENODEV, "Unsupported chip detected: %x\n", chipid);  in sy7802_chip_check()
393 	gpiod_set_value_cansleep(chip->enable_gpio, 1);  in sy7802_enable()
399 	gpiod_set_value_cansleep(chip->enable_gpio, 0);  in sy7802_disable()
404 	struct device_node *np = dev_of_node(chip->dev);  in sy7802_probe_dt()
408 	regmap_write(chip->regmap, SY7802_REG_ENABLE, SY7802_MODE_OFF);  in sy7802_probe_dt()
409 	regmap_write(chip->regmap, SY7802_REG_TORCH_BRIGHTNESS, LED_OFF);  in sy7802_probe_dt()
413 		struct sy7802_led *led = chip->leds + child_num;  in sy7802_probe_dt()  local
415 		led->chip = chip;  in sy7802_probe_dt()
416 		led->led_id = child_num;  in sy7802_probe_dt()
418 		ret = sy7802_init_flash_properties(chip->dev, led, child);  in sy7802_probe_dt()
422 		ret = sy7802_led_register(chip->dev, led, child);  in sy7802_probe_dt()
442 	regulator_disable(chip->vin_regulator);  in sy7802_regulator_disable_action()
456 	struct device *dev = &client->dev;  in sy7802_probe()
463 		return dev_err_probe(dev, -EINVAL, "Invalid amount of LED nodes %zu\n", count);  in sy7802_probe()
467 		return -ENOMEM;  in sy7802_probe()
469 	chip->num_leds = count;  in sy7802_probe()
471 	chip->dev = dev;  in sy7802_probe()
474 	chip->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in sy7802_probe()
475 	ret = PTR_ERR_OR_ZERO(chip->enable_gpio);  in sy7802_probe()
479 	chip->vin_regulator = devm_regulator_get(dev, "vin");  in sy7802_probe()
480 	ret = PTR_ERR_OR_ZERO(chip->vin_regulator);  in sy7802_probe()
484 	ret = regulator_enable(chip->vin_regulator);  in sy7802_probe()
492 	ret = devm_mutex_init(dev, &chip->mutex);  in sy7802_probe()
496 	mutex_lock(&chip->mutex);  in sy7802_probe()
498 	chip->regmap = devm_regmap_init_i2c(client, &sy7802_regmap_config);  in sy7802_probe()
499 	if (IS_ERR(chip->regmap)) {  in sy7802_probe()
500 		ret = PTR_ERR(chip->regmap);  in sy7802_probe()
518 	mutex_unlock(&chip->mutex);  in sy7802_probe()
538 MODULE_DESCRIPTION("Silergy SY7802 flash LED driver");