1 // SPDX-License-Identifier: GPL-2.0-only
3  *	LED Flash class driver for the AAT1290
4  *	1.5A Step-Up Current Regulator for Flash LEDs
12 #include <linux/led-class-flash.h>
20 #include <media/v4l2-flash-led-class.h>
24 #define AAT1290_MAX_MM_CURR_PERCENT_100	1
29 #define AAT1290_MOVIE_MODE_OFF		1
33 #define AAT1290_MM_TO_FL_1_92		1
40 #define AAT1290_EN_SET_TICK_TIME_US	1
49 	/* maximum LED current in movie mode */
51 	/* maximum LED current in flash mode */
57 	/* max LED brightness level */
67 	/* corresponding LED Flash class device */
96 static void aat1290_as2cwire_write(struct aat1290_led *led, int addr, int value)  in aat1290_as2cwire_write()  argument
100 	gpiod_direction_output(led->gpio_fl_en, 0);  in aat1290_as2cwire_write()
101 	gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_as2cwire_write()
108 		gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_as2cwire_write()
110 		gpiod_direction_output(led->gpio_en_set, 1);  in aat1290_as2cwire_write()
118 		gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_as2cwire_write()
120 		gpiod_direction_output(led->gpio_en_set, 1);  in aat1290_as2cwire_write()
126 static void aat1290_set_flash_safety_timer(struct aat1290_led *led,  in aat1290_set_flash_safety_timer()  argument
129 	struct led_classdev_flash *fled_cdev = &led->fled_cdev;  in aat1290_set_flash_safety_timer()
130 	struct led_flash_setting *flash_tm = &fled_cdev->timeout;  in aat1290_set_flash_safety_timer()
131 	int flash_tm_reg = AAT1290_FLASH_TM_NUM_LEVELS -  in aat1290_set_flash_safety_timer()
132 				(micro_sec / flash_tm->step) + 1;  in aat1290_set_flash_safety_timer()
134 	aat1290_as2cwire_write(led, AAT1290_FLASH_SAFETY_TIMER_ADDR,  in aat1290_set_flash_safety_timer()
138 /* LED subsystem callbacks */
144 	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);  in aat1290_led_brightness_set()  local
146 	mutex_lock(&led->lock);  in aat1290_led_brightness_set()
149 		gpiod_direction_output(led->gpio_fl_en, 0);  in aat1290_led_brightness_set()
150 		gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_led_brightness_set()
151 		led->movie_mode = false;  in aat1290_led_brightness_set()
153 		if (!led->movie_mode) {  in aat1290_led_brightness_set()
154 			aat1290_as2cwire_write(led,  in aat1290_led_brightness_set()
157 			led->movie_mode = true;  in aat1290_led_brightness_set()
160 		aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CURRENT_ADDR,  in aat1290_led_brightness_set()
161 				AAT1290_MAX_MM_CURR_PERCENT_0 - brightness);  in aat1290_led_brightness_set()
162 		aat1290_as2cwire_write(led, AAT1290_MOVIE_MODE_CONFIG_ADDR,  in aat1290_led_brightness_set()
166 	mutex_unlock(&led->lock);  in aat1290_led_brightness_set()
175 	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);  in aat1290_led_flash_strobe_set()  local
176 	struct led_classdev *led_cdev = &fled_cdev->led_cdev;  in aat1290_led_flash_strobe_set()
177 	struct led_flash_setting *timeout = &fled_cdev->timeout;  in aat1290_led_flash_strobe_set()
179 	mutex_lock(&led->lock);  in aat1290_led_flash_strobe_set()
182 		aat1290_set_flash_safety_timer(led, timeout->val);  in aat1290_led_flash_strobe_set()
183 		gpiod_direction_output(led->gpio_fl_en, 1);  in aat1290_led_flash_strobe_set()
185 		gpiod_direction_output(led->gpio_fl_en, 0);  in aat1290_led_flash_strobe_set()
186 		gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_led_flash_strobe_set()
195 	led_cdev->brightness = 0;  in aat1290_led_flash_strobe_set()
196 	led->movie_mode = false;  in aat1290_led_flash_strobe_set()
198 	mutex_unlock(&led->lock);  in aat1290_led_flash_strobe_set()
207 	 * Don't do anything - flash timeout is cached in the led-class-flash  in aat1290_led_flash_timeout_set()
215 static int aat1290_led_parse_dt(struct aat1290_led *led,  in aat1290_led_parse_dt()  argument
219 	struct device *dev = &led->pdev->dev;  in aat1290_led_parse_dt()
226 	led->gpio_fl_en = devm_gpiod_get(dev, "flen", GPIOD_ASIS);  in aat1290_led_parse_dt()
227 	if (IS_ERR(led->gpio_fl_en)) {  in aat1290_led_parse_dt()
228 		ret = PTR_ERR(led->gpio_fl_en);  in aat1290_led_parse_dt()
233 	led->gpio_en_set = devm_gpiod_get(dev, "enset", GPIOD_ASIS);  in aat1290_led_parse_dt()
234 	if (IS_ERR(led->gpio_en_set)) {  in aat1290_led_parse_dt()
235 		ret = PTR_ERR(led->gpio_en_set);  in aat1290_led_parse_dt()
241 	pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev);  in aat1290_led_parse_dt()
243 		cfg->has_external_strobe = false;  in aat1290_led_parse_dt()
247 		cfg->has_external_strobe = true;  in aat1290_led_parse_dt()
253 		dev_err(dev, "No DT child node found for connected LED.\n");  in aat1290_led_parse_dt()
254 		return -EINVAL;  in aat1290_led_parse_dt()
257 	ret = of_property_read_u32(child_node, "led-max-microamp",  in aat1290_led_parse_dt()
258 				&cfg->max_mm_current);  in aat1290_led_parse_dt()
260 	 * led-max-microamp will default to 1/20 of flash-max-microamp  in aat1290_led_parse_dt()
265 			"led-max-microamp DT property missing\n");  in aat1290_led_parse_dt()
267 	ret = of_property_read_u32(child_node, "flash-max-microamp",  in aat1290_led_parse_dt()
268 				&cfg->max_flash_current);  in aat1290_led_parse_dt()
271 			"flash-max-microamp DT property missing\n");  in aat1290_led_parse_dt()
275 	ret = of_property_read_u32(child_node, "flash-max-timeout-us",  in aat1290_led_parse_dt()
276 				&cfg->max_flash_tm);  in aat1290_led_parse_dt()
279 			"flash-max-timeout-us DT property missing\n");  in aat1290_led_parse_dt()
291 static void aat1290_led_validate_mm_current(struct aat1290_led *led,  in aat1290_led_validate_mm_current()  argument
296 	while (e - b > 1) {  in aat1290_led_validate_mm_current()
297 		i = b + (e - b) / 2;  in aat1290_led_validate_mm_current()
298 		if (cfg->max_mm_current < led->mm_current_scale[i])  in aat1290_led_validate_mm_current()
304 	cfg->max_mm_current = led->mm_current_scale[b];  in aat1290_led_validate_mm_current()
305 	cfg->max_brightness = b + 1;  in aat1290_led_validate_mm_current()
308 static int init_mm_current_scale(struct aat1290_led *led,  in init_mm_current_scale()  argument
316 			AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);  in init_mm_current_scale()
318 	led->mm_current_scale = devm_kzalloc(&led->pdev->dev,  in init_mm_current_scale()
321 	if (!led->mm_current_scale)  in init_mm_current_scale()
322 		return -ENOMEM;  in init_mm_current_scale()
325 		led->mm_current_scale[i] = max_mm_current *  in init_mm_current_scale()
331 static int aat1290_led_get_configuration(struct aat1290_led *led,  in aat1290_led_get_configuration()  argument
337 	ret = aat1290_led_parse_dt(led, cfg, sub_node);  in aat1290_led_get_configuration()
341 	 * Init non-linear movie mode current scale basing  in aat1290_led_get_configuration()
342 	 * on the max flash current from led configuration.  in aat1290_led_get_configuration()
344 	ret = init_mm_current_scale(led, cfg);  in aat1290_led_get_configuration()
348 	aat1290_led_validate_mm_current(led, cfg);  in aat1290_led_get_configuration()
352 	devm_kfree(&led->pdev->dev, led->mm_current_scale);  in aat1290_led_get_configuration()
358 static void aat1290_init_flash_timeout(struct aat1290_led *led,  in aat1290_init_flash_timeout()  argument
361 	struct led_classdev_flash *fled_cdev = &led->fled_cdev;  in aat1290_init_flash_timeout()
365 	setting = &fled_cdev->timeout;  in aat1290_init_flash_timeout()
366 	setting->min = cfg->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;  in aat1290_init_flash_timeout()
367 	setting->max = cfg->max_flash_tm;  in aat1290_init_flash_timeout()
368 	setting->step = setting->min;  in aat1290_init_flash_timeout()
369 	setting->val = setting->max;  in aat1290_init_flash_timeout()
377 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;  in aat1290_intensity_to_brightness()
378 	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);  in aat1290_intensity_to_brightness()  local
381 	for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)  in aat1290_intensity_to_brightness()
382 		if (intensity >= led->mm_current_scale[i])  in aat1290_intensity_to_brightness()
383 			return i + 1;  in aat1290_intensity_to_brightness()
385 	return 1;  in aat1290_intensity_to_brightness()
391 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;  in aat1290_brightness_to_intensity()
392 	struct aat1290_led *led = fled_cdev_to_led(fled_cdev);  in aat1290_brightness_to_intensity()  local
394 	return led->mm_current_scale[brightness - 1];  in aat1290_brightness_to_intensity()
400 	struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);  in aat1290_led_external_strobe_set()  local
401 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;  in aat1290_led_external_strobe_set()
402 	struct led_classdev *led_cdev = &fled_cdev->led_cdev;  in aat1290_led_external_strobe_set()
405 	gpiod_direction_output(led->gpio_fl_en, 0);  in aat1290_led_external_strobe_set()
406 	gpiod_direction_output(led->gpio_en_set, 0);  in aat1290_led_external_strobe_set()
408 	led->movie_mode = false;  in aat1290_led_external_strobe_set()
409 	led_cdev->brightness = 0;  in aat1290_led_external_strobe_set()
411 	pinctrl = devm_pinctrl_get_select(&led->pdev->dev,  in aat1290_led_external_strobe_set()
414 		dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n");  in aat1290_led_external_strobe_set()
421 static void aat1290_init_v4l2_flash_config(struct aat1290_led *led,  in aat1290_init_v4l2_flash_config()  argument
425 	struct led_classdev *led_cdev = &led->fled_cdev.led_cdev;  in aat1290_init_v4l2_flash_config()
428 	strlcpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,  in aat1290_init_v4l2_flash_config()
429 		sizeof(v4l2_sd_cfg->dev_name));  in aat1290_init_v4l2_flash_config()
431 	s = &v4l2_sd_cfg->intensity;  in aat1290_init_v4l2_flash_config()
432 	s->min = led->mm_current_scale[0];  in aat1290_init_v4l2_flash_config()
433 	s->max = led_cfg->max_mm_current;  in aat1290_init_v4l2_flash_config()
434 	s->step = 1;  in aat1290_init_v4l2_flash_config()
435 	s->val = s->max;  in aat1290_init_v4l2_flash_config()
437 	v4l2_sd_cfg->has_external_strobe = led_cfg->has_external_strobe;  in aat1290_init_v4l2_flash_config()
446 static inline void aat1290_init_v4l2_flash_config(struct aat1290_led *led,  in aat1290_init_v4l2_flash_config()  argument
461 	struct device *dev = &pdev->dev;  in aat1290_led_probe()
463 	struct aat1290_led *led;  in aat1290_led_probe()  local
471 	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);  in aat1290_led_probe()
472 	if (!led)  in aat1290_led_probe()
473 		return -ENOMEM;  in aat1290_led_probe()
475 	led->pdev = pdev;  in aat1290_led_probe()
476 	platform_set_drvdata(pdev, led);  in aat1290_led_probe()
478 	fled_cdev = &led->fled_cdev;  in aat1290_led_probe()
479 	fled_cdev->ops = &flash_ops;  in aat1290_led_probe()
480 	led_cdev = &fled_cdev->led_cdev;  in aat1290_led_probe()
482 	ret = aat1290_led_get_configuration(led, &led_cfg, &sub_node);  in aat1290_led_probe()
486 	mutex_init(&led->lock);  in aat1290_led_probe()
488 	/* Initialize LED Flash class device */  in aat1290_led_probe()
489 	led_cdev->brightness_set_blocking = aat1290_led_brightness_set;  in aat1290_led_probe()
490 	led_cdev->max_brightness = led_cfg.max_brightness;  in aat1290_led_probe()
491 	led_cdev->flags |= LED_DEV_CAP_FLASH;  in aat1290_led_probe()
493 	aat1290_init_flash_timeout(led, &led_cfg);  in aat1290_led_probe()
498 	/* Register LED Flash class device */  in aat1290_led_probe()
499 	ret = led_classdev_flash_register_ext(&pdev->dev, fled_cdev,  in aat1290_led_probe()
504 	aat1290_init_v4l2_flash_config(led, &led_cfg, &v4l2_sd_cfg);  in aat1290_led_probe()
507 	led->v4l2_flash = v4l2_flash_init(dev, of_fwnode_handle(sub_node),  in aat1290_led_probe()
510 	if (IS_ERR(led->v4l2_flash)) {  in aat1290_led_probe()
511 		ret = PTR_ERR(led->v4l2_flash);  in aat1290_led_probe()
520 	mutex_destroy(&led->lock);  in aat1290_led_probe()
527 	struct aat1290_led *led = platform_get_drvdata(pdev);  in aat1290_led_remove()  local
529 	v4l2_flash_release(led->v4l2_flash);  in aat1290_led_remove()
530 	led_classdev_flash_unregister(&led->fled_cdev);  in aat1290_led_remove()
532 	mutex_destroy(&led->lock);  in aat1290_led_remove()