1 // SPDX-License-Identifier: GPL-2.0-only
3  * LEDs driver for GPIOs
12 #include <linux/gpio.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/leds.h>
24 #include "leds.h"
51 	if (led_dat->blinking) {  in gpio_led_set()
52 		led_dat->platform_gpio_blink_set(led_dat->gpiod, level,  in gpio_led_set()
54 		led_dat->blinking = 0;  in gpio_led_set()
56 		if (led_dat->can_sleep)  in gpio_led_set()
57 			gpiod_set_value_cansleep(led_dat->gpiod, level);  in gpio_led_set()
59 			gpiod_set_value(led_dat->gpiod, level);  in gpio_led_set()
75 	led_dat->blinking = 1;  in gpio_blink_set()
76 	return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,  in gpio_blink_set()
88 	led_dat->cdev.default_trigger = template->default_trigger;  in create_gpio_led()
89 	led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);  in create_gpio_led()
90 	if (!led_dat->can_sleep)  in create_gpio_led()
91 		led_dat->cdev.brightness_set = gpio_led_set;  in create_gpio_led()
93 		led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking;  in create_gpio_led()
94 	led_dat->blinking = 0;  in create_gpio_led()
96 		led_dat->platform_gpio_blink_set = blink_set;  in create_gpio_led()
97 		led_dat->cdev.blink_set = gpio_blink_set;  in create_gpio_led()
99 	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) {  in create_gpio_led()
100 		state = gpiod_get_value_cansleep(led_dat->gpiod);  in create_gpio_led()
104 		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);  in create_gpio_led()
106 	led_dat->cdev.brightness = state;  in create_gpio_led()
107 	led_dat->cdev.max_brightness = 1;  in create_gpio_led()
108 	if (!template->retain_state_suspended)  in create_gpio_led()
109 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;  in create_gpio_led()
110 	if (template->panic_indicator)  in create_gpio_led()
111 		led_dat->cdev.flags |= LED_PANIC_INDICATOR;  in create_gpio_led()
112 	if (template->retain_state_shutdown)  in create_gpio_led()
113 		led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;  in create_gpio_led()
115 	ret = gpiod_direction_output(led_dat->gpiod, state);  in create_gpio_led()
119 	if (template->name) {  in create_gpio_led()
120 		led_dat->cdev.name = template->name;  in create_gpio_led()
121 		ret = devm_led_classdev_register(parent, &led_dat->cdev);  in create_gpio_led()
124 		ret = devm_led_classdev_register_ext(parent, &led_dat->cdev,  in create_gpio_led()
131 	pinctrl = devm_pinctrl_get_select_default(led_dat->cdev.dev);  in create_gpio_led()
133 	/* pinctrl-%d not present, not an error */  in create_gpio_led()
134 	if (ret == -ENODEV)  in create_gpio_led()
137 		dev_warn(led_dat->cdev.dev, "Failed to select %pfw pinctrl: %d\n",  in create_gpio_led()
146 	struct gpio_led_data leds[] __counted_by(num_leds);
157 		return ERR_PTR(-ENODEV);  in gpio_leds_create()
159 	priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);  in gpio_leds_create()
161 		return ERR_PTR(-ENOMEM);  in gpio_leds_create()
162 	priv->num_leds = count;  in gpio_leds_create()
166 		struct gpio_led_data *led_dat = &priv->leds[used];  in gpio_leds_create()
177 			dev_err_probe(dev, PTR_ERR(led.gpiod), "Failed to get GPIO '%pfw'\n",  in gpio_leds_create()
183 		led_dat->gpiod = led.gpiod;  in gpio_leds_create()
187 		if (fwnode_property_present(child, "retain-state-suspended"))  in gpio_leds_create()
189 		if (fwnode_property_present(child, "retain-state-shutdown"))  in gpio_leds_create()
191 		if (fwnode_property_present(child, "panic-indicator"))  in gpio_leds_create()
200 		gpiod_set_consumer_name(led_dat->gpiod,  in gpio_leds_create()
201 					led_dat->cdev.dev->kobj.name);  in gpio_leds_create()
204 	priv->num_leds = used;  in gpio_leds_create()
210 	{ .compatible = "gpio-leds", },
227 	 * the GPIO from there.  in gpio_led_get_gpiod()
233 		gpiod_set_consumer_name(gpiod, template->name);  in gpio_led_get_gpiod()
239 	 * still uses GPIO numbers. Ultimately we would like to get  in gpio_led_get_gpiod()
243 	/* skip leds that aren't available */  in gpio_led_get_gpiod()
244 	if (!gpio_is_valid(template->gpio))  in gpio_led_get_gpiod()
245 		return ERR_PTR(-ENOENT);  in gpio_led_get_gpiod()
247 	if (template->active_low)  in gpio_led_get_gpiod()
250 	ret = devm_gpio_request_one(dev, template->gpio, flags,  in gpio_led_get_gpiod()
251 				    template->name);  in gpio_led_get_gpiod()
255 	gpiod = gpio_to_desc(template->gpio);  in gpio_led_get_gpiod()
257 		return ERR_PTR(-EINVAL);  in gpio_led_get_gpiod()
264 	struct device *dev = &pdev->dev;  in gpio_led_probe()
269 	if (pdata && pdata->num_leds) {  in gpio_led_probe()
270 		priv = devm_kzalloc(dev, struct_size(priv, leds, pdata->num_leds), GFP_KERNEL);  in gpio_led_probe()
272 			return -ENOMEM;  in gpio_led_probe()
274 		priv->num_leds = pdata->num_leds;  in gpio_led_probe()
275 		for (i = 0; i < priv->num_leds; i++) {  in gpio_led_probe()
276 			const struct gpio_led *template = &pdata->leds[i];  in gpio_led_probe()
277 			struct gpio_led_data *led_dat = &priv->leds[i];  in gpio_led_probe()
279 			if (template->gpiod)  in gpio_led_probe()
280 				led_dat->gpiod = template->gpiod;  in gpio_led_probe()
282 				led_dat->gpiod =  in gpio_led_probe()
284 			if (IS_ERR(led_dat->gpiod)) {  in gpio_led_probe()
285 				dev_info(dev, "Skipping unavailable LED gpio %d (%s)\n",  in gpio_led_probe()
286 					 template->gpio, template->name);  in gpio_led_probe()
291 					      pdata->gpio_blink_set);  in gpio_led_probe()
311 	for (i = 0; i < priv->num_leds; i++) {  in gpio_led_shutdown()
312 		struct gpio_led_data *led = &priv->leds[i];  in gpio_led_shutdown()
314 		if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))  in gpio_led_shutdown()
315 			gpio_led_set(&led->cdev, LED_OFF);  in gpio_led_shutdown()
323 		.name	= "leds-gpio",
331 MODULE_DESCRIPTION("GPIO LED driver");
333 MODULE_ALIAS("platform:leds-gpio");