1 // SPDX-License-Identifier: GPL-2.0
5 #include <linux/led-class-flash.h>
10 #include <media/v4l2-flash-led-class.h>
27 	/* current timeout in us */
28 	u32 timeout;  member
29 	/* maximum timeout in us */
43 	if (priv->enabled == state)  in sgm3140_strobe_set()
47 		ret = regulator_enable(priv->vin_regulator);  in sgm3140_strobe_set()
49 			dev_err(fled_cdev->led_cdev.dev,  in sgm3140_strobe_set()
53 		gpiod_set_value_cansleep(priv->flash_gpio, 1);  in sgm3140_strobe_set()
54 		gpiod_set_value_cansleep(priv->enable_gpio, 1);  in sgm3140_strobe_set()
55 		mod_timer(&priv->powerdown_timer,  in sgm3140_strobe_set()
56 			  jiffies + usecs_to_jiffies(priv->timeout));  in sgm3140_strobe_set()
58 		del_timer_sync(&priv->powerdown_timer);  in sgm3140_strobe_set()
59 		gpiod_set_value_cansleep(priv->enable_gpio, 0);  in sgm3140_strobe_set()
60 		gpiod_set_value_cansleep(priv->flash_gpio, 0);  in sgm3140_strobe_set()
61 		ret = regulator_disable(priv->vin_regulator);  in sgm3140_strobe_set()
63 			dev_err(fled_cdev->led_cdev.dev,  in sgm3140_strobe_set()
69 	priv->enabled = state;  in sgm3140_strobe_set()
78 	*state = timer_pending(&priv->powerdown_timer);  in sgm3140_strobe_get()
84 			       u32 timeout)  in sgm3140_timeout_set()  argument
88 	priv->timeout = timeout;  in sgm3140_timeout_set()
107 	if (priv->enabled == enable)  in sgm3140_brightness_set()
111 		ret = regulator_enable(priv->vin_regulator);  in sgm3140_brightness_set()
113 			dev_err(led_cdev->dev,  in sgm3140_brightness_set()
117 		gpiod_set_value_cansleep(priv->enable_gpio, 1);  in sgm3140_brightness_set()
119 		gpiod_set_value_cansleep(priv->enable_gpio, 0);  in sgm3140_brightness_set()
120 		ret = regulator_disable(priv->vin_regulator);  in sgm3140_brightness_set()
122 			dev_err(led_cdev->dev,  in sgm3140_brightness_set()
128 	priv->enabled = enable;  in sgm3140_brightness_set()
137 	gpiod_set_value(priv->enable_gpio, 0);  in sgm3140_powerdown_timer()
138 	gpiod_set_value(priv->flash_gpio, 0);  in sgm3140_powerdown_timer()
139 	regulator_disable(priv->vin_regulator);  in sgm3140_powerdown_timer()
141 	priv->enabled = false;  in sgm3140_powerdown_timer()
146 	struct led_classdev_flash *fled_cdev = &priv->fled_cdev;  in sgm3140_init_flash_timeout()
149 	/* Init flash timeout setting */  in sgm3140_init_flash_timeout()
150 	s = &fled_cdev->timeout;  in sgm3140_init_flash_timeout()
151 	s->min = 1;  in sgm3140_init_flash_timeout()
152 	s->max = priv->max_timeout;  in sgm3140_init_flash_timeout()
153 	s->step = 1;  in sgm3140_init_flash_timeout()
154 	s->val = FLASH_TIMEOUT_DEFAULT;  in sgm3140_init_flash_timeout()
161 	struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev;  in sgm3140_init_v4l2_flash_config()
164 	strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,  in sgm3140_init_v4l2_flash_config()
165 		sizeof(v4l2_sd_cfg->dev_name));  in sgm3140_init_v4l2_flash_config()
167 	/* Init flash intensity setting */  in sgm3140_init_v4l2_flash_config()
168 	s = &v4l2_sd_cfg->intensity;  in sgm3140_init_v4l2_flash_config()
169 	s->min = 0;  in sgm3140_init_v4l2_flash_config()
170 	s->max = 1;  in sgm3140_init_v4l2_flash_config()
171 	s->step = 1;  in sgm3140_init_v4l2_flash_config()
172 	s->val = 1;  in sgm3140_init_v4l2_flash_config()
192 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in sgm3140_probe()
194 		return -ENOMEM;  in sgm3140_probe()
196 	priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW);  in sgm3140_probe()
197 	ret = PTR_ERR_OR_ZERO(priv->flash_gpio);  in sgm3140_probe()
199 		return dev_err_probe(&pdev->dev, ret,  in sgm3140_probe()
200 				     "Failed to request flash gpio\n");  in sgm3140_probe()
202 	priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);  in sgm3140_probe()
203 	ret = PTR_ERR_OR_ZERO(priv->enable_gpio);  in sgm3140_probe()
205 		return dev_err_probe(&pdev->dev, ret,  in sgm3140_probe()
208 	priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin");  in sgm3140_probe()
209 	ret = PTR_ERR_OR_ZERO(priv->vin_regulator);  in sgm3140_probe()
211 		return dev_err_probe(&pdev->dev, ret,  in sgm3140_probe()
214 	child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode,  in sgm3140_probe()
217 		dev_err(&pdev->dev,  in sgm3140_probe()
219 		return -EINVAL;  in sgm3140_probe()
222 	ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us",  in sgm3140_probe()
223 				       &priv->max_timeout);  in sgm3140_probe()
225 		priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT;  in sgm3140_probe()
226 		dev_warn(&pdev->dev,  in sgm3140_probe()
227 			 "flash-max-timeout-us property missing\n");  in sgm3140_probe()
231 	 * Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout  in sgm3140_probe()
234 	priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);  in sgm3140_probe()
236 	timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0);  in sgm3140_probe()
238 	fled_cdev = &priv->fled_cdev;  in sgm3140_probe()
239 	led_cdev = &fled_cdev->led_cdev;  in sgm3140_probe()
241 	fled_cdev->ops = &sgm3140_flash_ops;  in sgm3140_probe()
243 	led_cdev->brightness_set_blocking = sgm3140_brightness_set;  in sgm3140_probe()
244 	led_cdev->max_brightness = LED_ON;  in sgm3140_probe()
245 	led_cdev->flags |= LED_DEV_CAP_FLASH;  in sgm3140_probe()
254 	ret = devm_led_classdev_flash_register_ext(&pdev->dev,  in sgm3140_probe()
257 		dev_err(&pdev->dev, "Failed to register flash device: %d\n",  in sgm3140_probe()
264 	/* Create V4L2 Flash subdev */  in sgm3140_probe()
265 	priv->v4l2_flash = v4l2_flash_init(&pdev->dev,  in sgm3140_probe()
269 	if (IS_ERR(priv->v4l2_flash)) {  in sgm3140_probe()
270 		ret = PTR_ERR(priv->v4l2_flash);  in sgm3140_probe()
285 	del_timer_sync(&priv->powerdown_timer);  in sgm3140_remove()
287 	v4l2_flash_release(priv->v4l2_flash);  in sgm3140_remove()