2  * LEDs driver for GPIOs
14 #include <linux/gpio.h>
15 #include <linux/gpio/consumer.h>
17 #include <linux/leds.h>
49 	if (led_dat->blinking) {  in gpio_led_set()
50 		led_dat->platform_gpio_blink_set(led_dat->gpiod, level,  in gpio_led_set()
52 		led_dat->blinking = 0;  in gpio_led_set()
54 		if (led_dat->can_sleep)  in gpio_led_set()
55 			gpiod_set_value_cansleep(led_dat->gpiod, level);  in gpio_led_set()
57 			gpiod_set_value(led_dat->gpiod, level);  in gpio_led_set()
73 	led_dat->blinking = 1;  in gpio_blink_set()
74 	return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,  in gpio_blink_set()
84 	led_dat->gpiod = template->gpiod;  in create_gpio_led()
85 	if (!led_dat->gpiod) {  in create_gpio_led()
88 		 * still uses GPIO numbers. Ultimately we would like to get  in create_gpio_led()
93 		/* skip leds that aren't available */  in create_gpio_led()
94 		if (!gpio_is_valid(template->gpio)) {  in create_gpio_led()
95 			dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",  in create_gpio_led()
96 					template->gpio, template->name);  in create_gpio_led()
100 		if (template->active_low)  in create_gpio_led()
103 		ret = devm_gpio_request_one(parent, template->gpio, flags,  in create_gpio_led()
104 					    template->name);  in create_gpio_led()
108 		led_dat->gpiod = gpio_to_desc(template->gpio);  in create_gpio_led()
109 		if (!led_dat->gpiod)  in create_gpio_led()
110 			return -EINVAL;  in create_gpio_led()
113 	led_dat->cdev.name = template->name;  in create_gpio_led()
114 	led_dat->cdev.default_trigger = template->default_trigger;  in create_gpio_led()
115 	led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);  in create_gpio_led()
116 	if (!led_dat->can_sleep)  in create_gpio_led()
117 		led_dat->cdev.brightness_set = gpio_led_set;  in create_gpio_led()
119 		led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking;  in create_gpio_led()
120 	led_dat->blinking = 0;  in create_gpio_led()
122 		led_dat->platform_gpio_blink_set = blink_set;  in create_gpio_led()
123 		led_dat->cdev.blink_set = gpio_blink_set;  in create_gpio_led()
125 	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) {  in create_gpio_led()
126 		state = gpiod_get_value_cansleep(led_dat->gpiod);  in create_gpio_led()
130 		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);  in create_gpio_led()
132 	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;  in create_gpio_led()
133 	if (!template->retain_state_suspended)  in create_gpio_led()
134 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;  in create_gpio_led()
135 	if (template->panic_indicator)  in create_gpio_led()
136 		led_dat->cdev.flags |= LED_PANIC_INDICATOR;  in create_gpio_led()
137 	if (template->retain_state_shutdown)  in create_gpio_led()
138 		led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;  in create_gpio_led()
140 	ret = gpiod_direction_output(led_dat->gpiod, state);  in create_gpio_led()
144 	return devm_of_led_classdev_register(parent, np, &led_dat->cdev);  in create_gpio_led()
149 	struct gpio_led_data leds[];  member
160 	struct device *dev = &pdev->dev;  in gpio_leds_create()
167 		return ERR_PTR(-ENODEV);  in gpio_leds_create()
171 		return ERR_PTR(-ENOMEM);  in gpio_leds_create()
174 		struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];  in gpio_leds_create()
181 			led.name = np->name;  in gpio_leds_create()
184 			return ERR_PTR(-EINVAL);  in gpio_leds_create()
195 		fwnode_property_read_string(child, "linux,default-trigger",  in gpio_leds_create()
198 		if (!fwnode_property_read_string(child, "default-state",  in gpio_leds_create()
208 		if (fwnode_property_present(child, "retain-state-suspended"))  in gpio_leds_create()
210 		if (fwnode_property_present(child, "retain-state-shutdown"))  in gpio_leds_create()
212 		if (fwnode_property_present(child, "panic-indicator"))  in gpio_leds_create()
220 		led_dat->cdev.dev->of_node = np;  in gpio_leds_create()
221 		priv->num_leds++;  in gpio_leds_create()
228 	{ .compatible = "gpio-leds", },
236 	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);  in gpio_led_probe()
240 	if (pdata && pdata->num_leds) {  in gpio_led_probe()
241 		priv = devm_kzalloc(&pdev->dev,  in gpio_led_probe()
242 				sizeof_gpio_leds_priv(pdata->num_leds),  in gpio_led_probe()
245 			return -ENOMEM;  in gpio_led_probe()
247 		priv->num_leds = pdata->num_leds;  in gpio_led_probe()
248 		for (i = 0; i < priv->num_leds; i++) {  in gpio_led_probe()
249 			ret = create_gpio_led(&pdata->leds[i], &priv->leds[i],  in gpio_led_probe()
250 					      &pdev->dev, NULL,  in gpio_led_probe()
251 					      pdata->gpio_blink_set);  in gpio_led_probe()
271 	for (i = 0; i < priv->num_leds; i++) {  in gpio_led_shutdown()
272 		struct gpio_led_data *led = &priv->leds[i];  in gpio_led_shutdown()
274 		if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))  in gpio_led_shutdown()
275 			gpio_led_set(&led->cdev, LED_OFF);  in gpio_led_shutdown()
283 		.name	= "leds-gpio",
291 MODULE_DESCRIPTION("GPIO LED driver");
293 MODULE_ALIAS("platform:leds-gpio");