1 // SPDX-License-Identifier: GPL-2.0-or-later
28 #include <linux/led-class-flash.h>
35 #include <media/v4l2-flash-led-class.h>
37 /* We can provide 15-700 mA out to the LED */
40 /* The maximum intensity is 1-16 for flash and 1-100 for torch */
56 	u32 max_timeout; /* Flash max timeout */
68 	gpiod_set_value(rt->enable_flash, 0);  in rt8515_gpio_led_off()
69 	gpiod_set_value(rt->enable_torch, 0);  in rt8515_gpio_led_off()
73 					  int brightness)  in rt8515_gpio_brightness_commit()  argument
79 	 * brightness one step at a time.  in rt8515_gpio_brightness_commit()
81 	for (i = 0; i < brightness; i++) {  in rt8515_gpio_brightness_commit()
91 				     enum led_brightness brightness)  in rt8515_led_brightness_set()  argument
96 	mutex_lock(&rt->lock);  in rt8515_led_brightness_set()
98 	if (brightness == LED_OFF) {  in rt8515_led_brightness_set()
101 	} else if (brightness < RT8515_TORCH_MAX) {  in rt8515_led_brightness_set()
102 		/* Step it up to movie mode brightness using the flash pin */  in rt8515_led_brightness_set()
103 		rt8515_gpio_brightness_commit(rt->enable_torch, brightness);  in rt8515_led_brightness_set()
105 		/* Max torch brightness requested */  in rt8515_led_brightness_set()
106 		gpiod_set_value(rt->enable_torch, 1);  in rt8515_led_brightness_set()
109 	mutex_unlock(&rt->lock);  in rt8515_led_brightness_set()
118 	struct led_flash_setting *timeout = &fled->timeout;  in rt8515_led_flash_strobe_set()
119 	int brightness = rt->flash_max_intensity;  in rt8515_led_flash_strobe_set()  local
121 	mutex_lock(&rt->lock);  in rt8515_led_flash_strobe_set()
124 		/* Enable LED flash mode and set brightness */  in rt8515_led_flash_strobe_set()
125 		rt8515_gpio_brightness_commit(rt->enable_flash, brightness);  in rt8515_led_flash_strobe_set()
127 		mod_timer(&rt->powerdown_timer,  in rt8515_led_flash_strobe_set()
128 			  jiffies + usecs_to_jiffies(timeout->val));  in rt8515_led_flash_strobe_set()
130 		del_timer_sync(&rt->powerdown_timer);  in rt8515_led_flash_strobe_set()
135 	fled->led_cdev.brightness = LED_OFF;  in rt8515_led_flash_strobe_set()
138 	mutex_unlock(&rt->lock);  in rt8515_led_flash_strobe_set()
148 	*state = timer_pending(&rt->powerdown_timer);  in rt8515_led_flash_strobe_get()
156 	/* The timeout is stored in the led-class-flash core */  in rt8515_led_flash_timeout_set()
176 	struct led_classdev_flash *fled = &rt->fled;  in rt8515_init_flash_timeout()
180 	s = &fled->timeout;  in rt8515_init_flash_timeout()
181 	s->min = 1;  in rt8515_init_flash_timeout()
182 	s->max = rt->max_timeout;  in rt8515_init_flash_timeout()
183 	s->step = 1;  in rt8515_init_flash_timeout()
188 	s->val = min(rt->max_timeout, RT8515_TIMEOUT_US);  in rt8515_init_flash_timeout()
196 	struct led_classdev *led = &rt->fled.led_cdev;  in rt8515_init_v4l2_flash_config()
199 	strscpy(v4l2_sd_cfg->dev_name, led->dev->kobj.name,  in rt8515_init_v4l2_flash_config()
200 		sizeof(v4l2_sd_cfg->dev_name));  in rt8515_init_v4l2_flash_config()
204 	 * capped from the device tree max intensity setting  in rt8515_init_v4l2_flash_config()
207 	s = &v4l2_sd_cfg->intensity;  in rt8515_init_v4l2_flash_config()
208 	s->min = 1;  in rt8515_init_v4l2_flash_config()
209 	s->max = rt->flash_max_intensity;  in rt8515_init_v4l2_flash_config()
210 	s->step = 1;  in rt8515_init_v4l2_flash_config()
211 	s->val = s->max;  in rt8515_init_v4l2_flash_config()
216 	v4l2_flash_release(rt->v4l2_flash);  in rt8515_v4l2_flash_release()
242 	fwnode_property_read_u32(rt->dev->fwnode, resistance, &res);  in rt8515_determine_max_intensity()
247 		dev_err(rt->dev,  in rt8515_determine_max_intensity()
248 			"either %s or %s missing from DT, using HW max\n",  in rt8515_determine_max_intensity()
261 	 * Calculate max intensity (linear scaling)  in rt8515_determine_max_intensity()
266 	dev_info(rt->dev,  in rt8515_determine_max_intensity()
267 		 "current restricted from %u to %u mA, max intensity %d/100\n",  in rt8515_determine_max_intensity()
271 	dev_info(rt->dev, "max intensity %d/%d = %d mA\n",  in rt8515_determine_max_intensity()
278 	struct device *dev = &pdev->dev;  in rt8515_probe()
289 		return -ENOMEM;  in rt8515_probe()
291 	rt->dev = dev;  in rt8515_probe()
292 	fled = &rt->fled;  in rt8515_probe()
293 	led = &fled->led_cdev;  in rt8515_probe()
295 	/* ENF - Enable Flash line */  in rt8515_probe()
296 	rt->enable_flash = devm_gpiod_get(dev, "enf", GPIOD_OUT_LOW);  in rt8515_probe()
297 	if (IS_ERR(rt->enable_flash))  in rt8515_probe()
298 		return dev_err_probe(dev, PTR_ERR(rt->enable_flash),  in rt8515_probe()
301 	/* ENT - Enable Torch line */  in rt8515_probe()
302 	rt->enable_torch = devm_gpiod_get(dev, "ent", GPIOD_OUT_LOW);  in rt8515_probe()
303 	if (IS_ERR(rt->enable_torch))  in rt8515_probe()
304 		return dev_err_probe(dev, PTR_ERR(rt->enable_torch),  in rt8515_probe()
307 	child = fwnode_get_next_available_child_node(dev->fwnode, NULL);  in rt8515_probe()
311 		return -EINVAL;  in rt8515_probe()
315 	rt8515_determine_max_intensity(rt, child, "richtek,rfs-ohms",  in rt8515_probe()
316 				       "flash-max-microamp",  in rt8515_probe()
318 				       &rt->flash_max_intensity);  in rt8515_probe()
319 	rt8515_determine_max_intensity(rt, child, "richtek,rts-ohms",  in rt8515_probe()
320 				       "led-max-microamp",  in rt8515_probe()
322 				       &rt->torch_max_intensity);  in rt8515_probe()
324 	ret = fwnode_property_read_u32(child, "flash-max-timeout-us",  in rt8515_probe()
325 				       &rt->max_timeout);  in rt8515_probe()
327 		rt->max_timeout = RT8515_MAX_TIMEOUT_US;  in rt8515_probe()
329 			 "flash-max-timeout-us property missing\n");  in rt8515_probe()
331 	timer_setup(&rt->powerdown_timer, rt8515_powerdown_timer, 0);  in rt8515_probe()
334 	fled->ops = &rt8515_flash_ops;  in rt8515_probe()
336 	led->max_brightness = rt->torch_max_intensity;  in rt8515_probe()
337 	led->brightness_set_blocking = rt8515_led_brightness_set;  in rt8515_probe()
338 	led->flags |= LED_CORE_SUSPENDRESUME | LED_DEV_CAP_FLASH;  in rt8515_probe()
340 	mutex_init(&rt->lock);  in rt8515_probe()
347 		mutex_destroy(&rt->lock);  in rt8515_probe()
348 		dev_err(dev, "can't register LED %s\n", led->name);  in rt8515_probe()
355 	rt->v4l2_flash = v4l2_flash_init(dev, child, fled, NULL, &v4l2_sd_cfg);  in rt8515_probe()
356 	if (IS_ERR(rt->v4l2_flash)) {  in rt8515_probe()
357 		ret = PTR_ERR(rt->v4l2_flash);  in rt8515_probe()
375 	del_timer_sync(&rt->powerdown_timer);  in rt8515_remove()
376 	mutex_destroy(&rt->lock);  in rt8515_remove()