1 // SPDX-License-Identifier: GPL-2.0-only
3  * LED driver : leds-ktd2692.c
12 #include <linux/led-class-flash.h>
24 /* Value related the flash mode */
29 /* Macro for getting offset of flash timeout */
30 #define GET_TIMEOUT_OFFSET(timeout, step)	((timeout) / (step))  argument
56 /* Movie / Flash Mode Control */
66 	/* maximum LED current in flash mode */
68 	/* maximum flash timeout */
70 	/* max LED brightness level */
75 	/* Related LED Flash class device */
97 	gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);  in ktd2692_expresswire_start()
103 	gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);  in ktd2692_expresswire_reset()
109 	gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);  in ktd2692_expresswire_end()
111 	gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);  in ktd2692_expresswire_end()
134 		gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);  in ktd2692_expresswire_set_bit()
136 		gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);  in ktd2692_expresswire_set_bit()
139 		gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);  in ktd2692_expresswire_set_bit()
141 		gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);  in ktd2692_expresswire_set_bit()
151 	for (i = 7; i >= 0; i--)  in ktd2692_expresswire_write()
162 	mutex_lock(&led->lock);  in ktd2692_led_brightness_set()
165 		led->mode = KTD2692_MODE_DISABLE;  in ktd2692_led_brightness_set()
166 		gpiod_direction_output(led->aux_gpio, KTD2692_LOW);  in ktd2692_led_brightness_set()
170 		led->mode = KTD2692_MODE_MOVIE;  in ktd2692_led_brightness_set()
173 	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);  in ktd2692_led_brightness_set()
174 	mutex_unlock(&led->lock);  in ktd2692_led_brightness_set()
183 	struct led_flash_setting *timeout = &fled_cdev->timeout;  in ktd2692_led_flash_strobe_set()  local
186 	mutex_lock(&led->lock);  in ktd2692_led_flash_strobe_set()
189 		flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step);  in ktd2692_led_flash_strobe_set()
193 		led->mode = KTD2692_MODE_FLASH;  in ktd2692_led_flash_strobe_set()
194 		gpiod_direction_output(led->aux_gpio, KTD2692_HIGH);  in ktd2692_led_flash_strobe_set()
196 		led->mode = KTD2692_MODE_DISABLE;  in ktd2692_led_flash_strobe_set()
197 		gpiod_direction_output(led->aux_gpio, KTD2692_LOW);  in ktd2692_led_flash_strobe_set()
200 	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);  in ktd2692_led_flash_strobe_set()
202 	fled_cdev->led_cdev.brightness = LED_OFF;  in ktd2692_led_flash_strobe_set()
203 	led->mode = KTD2692_MODE_DISABLE;  in ktd2692_led_flash_strobe_set()
205 	mutex_unlock(&led->lock);  in ktd2692_led_flash_strobe_set()
211 					 u32 timeout)  in ktd2692_led_flash_timeout_set()  argument
222 	step = KTD2692_MM_TO_FL_RATIO(cfg->flash_max_microamp)  in ktd2692_init_movie_current_max()
227 		offset--;  in ktd2692_init_movie_current_max()
228 	} while ((movie_current_microamp > cfg->movie_max_microamp) &&  in ktd2692_init_movie_current_max()
231 	cfg->max_brightness = offset;  in ktd2692_init_movie_current_max()
239 	setting = &fled_cdev->timeout;  in ktd2692_init_flash_timeout()
240 	setting->min = KTD2692_FLASH_MODE_TIMEOUT_DISABLE;  in ktd2692_init_flash_timeout()
241 	setting->max = cfg->flash_max_timeout;  in ktd2692_init_flash_timeout()
242 	setting->step = cfg->flash_max_timeout  in ktd2692_init_flash_timeout()
243 			/ (KTD2692_FLASH_MODE_TIMEOUT_LEVELS - 1);  in ktd2692_init_flash_timeout()
244 	setting->val = cfg->flash_max_timeout;  in ktd2692_init_flash_timeout()
249 	led->mode = KTD2692_MODE_DISABLE;  in ktd2692_setup()
251 	gpiod_direction_output(led->aux_gpio, KTD2692_LOW);  in ktd2692_setup()
253 	ktd2692_expresswire_write(led, (KTD2692_MM_MIN_CURR_THRESHOLD_SCALE - 1)  in ktd2692_setup()
267 		return -ENXIO;  in ktd2692_parse_dt()
269 	led->ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);  in ktd2692_parse_dt()
270 	ret = PTR_ERR_OR_ZERO(led->ctrl_gpio);  in ktd2692_parse_dt()
272 		dev_err(dev, "cannot get ctrl-gpios %d\n", ret);  in ktd2692_parse_dt()
276 	led->aux_gpio = devm_gpiod_get(dev, "aux", GPIOD_ASIS);  in ktd2692_parse_dt()
277 	ret = PTR_ERR_OR_ZERO(led->aux_gpio);  in ktd2692_parse_dt()
279 		dev_err(dev, "cannot get aux-gpios %d\n", ret);  in ktd2692_parse_dt()
283 	led->regulator = devm_regulator_get(dev, "vin");  in ktd2692_parse_dt()
284 	if (IS_ERR(led->regulator))  in ktd2692_parse_dt()
285 		led->regulator = NULL;  in ktd2692_parse_dt()
287 	if (led->regulator) {  in ktd2692_parse_dt()
288 		ret = regulator_enable(led->regulator);  in ktd2692_parse_dt()
296 		return -EINVAL;  in ktd2692_parse_dt()
299 	led->fled_cdev.led_cdev.name =  in ktd2692_parse_dt()
300 		of_get_property(child_node, "label", NULL) ? : child_node->name;  in ktd2692_parse_dt()
302 	ret = of_property_read_u32(child_node, "led-max-microamp",  in ktd2692_parse_dt()
303 				   &cfg->movie_max_microamp);  in ktd2692_parse_dt()
305 		dev_err(dev, "failed to parse led-max-microamp\n");  in ktd2692_parse_dt()
309 	ret = of_property_read_u32(child_node, "flash-max-microamp",  in ktd2692_parse_dt()
310 				   &cfg->flash_max_microamp);  in ktd2692_parse_dt()
312 		dev_err(dev, "failed to parse flash-max-microamp\n");  in ktd2692_parse_dt()
316 	ret = of_property_read_u32(child_node, "flash-max-timeout-us",  in ktd2692_parse_dt()
317 				   &cfg->flash_max_timeout);  in ktd2692_parse_dt()
319 		dev_err(dev, "failed to parse flash-max-timeout-us\n");  in ktd2692_parse_dt()
341 	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);  in ktd2692_probe()
343 		return -ENOMEM;  in ktd2692_probe()
345 	fled_cdev = &led->fled_cdev;  in ktd2692_probe()
346 	led_cdev = &fled_cdev->led_cdev;  in ktd2692_probe()
348 	ret = ktd2692_parse_dt(led, &pdev->dev, &led_cfg);  in ktd2692_probe()
355 	fled_cdev->ops = &flash_ops;  in ktd2692_probe()
357 	led_cdev->max_brightness = led_cfg.max_brightness;  in ktd2692_probe()
358 	led_cdev->brightness_set_blocking = ktd2692_led_brightness_set;  in ktd2692_probe()
359 	led_cdev->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;  in ktd2692_probe()
361 	mutex_init(&led->lock);  in ktd2692_probe()
365 	ret = led_classdev_flash_register(&pdev->dev, fled_cdev);  in ktd2692_probe()
367 		dev_err(&pdev->dev, "can't register LED %s\n", led_cdev->name);  in ktd2692_probe()
368 		mutex_destroy(&led->lock);  in ktd2692_probe()
382 	led_classdev_flash_unregister(&led->fled_cdev);  in ktd2692_remove()
384 	if (led->regulator) {  in ktd2692_remove()
385 		ret = regulator_disable(led->regulator);  in ktd2692_remove()
387 			dev_err(&pdev->dev,  in ktd2692_remove()
391 	mutex_destroy(&led->lock);  in ktd2692_remove()