Commit 8cd7d6da authored by Daniel Mack's avatar Daniel Mack Committed by Jacek Anaszewski
Browse files

leds: lt3593: Add device tree probing glue 



The binding details are described in an earlier commit that adds the
documentation.

Signed-off-by: default avatarDaniel Mack <daniel@zonque.org>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent 73f103c9

drivers/leds/leds-lt3593.c

+70 −0
Original line number Diff line number Diff line
@@ -24,8 +24,11 @@ 
#include <linux/gpio/consumer.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/of.h>

#include <uapi/linux/uleds.h>



struct lt3593_led_data {

	char name[LED_MAX_NAME_SIZE];

	struct led_classdev cdev;

	struct gpio_desc *gpiod;

};
@@ -120,22 +123,89 @@ static int lt3593_led_probe(struct platform_device *pdev) 
{

	struct device *dev = &pdev->dev;

	struct lt3593_led_data *led_data;

	struct fwnode_handle *child;

	int ret, state = LEDS_GPIO_DEFSTATE_OFF;

	enum gpiod_flags flags = GPIOD_OUT_LOW;

	const char *tmp;



	if (dev_get_platdata(dev)) {

		led_data = lt3593_led_probe_pdata(dev);

		if (IS_ERR(led_data))

			return PTR_ERR(led_data);



		goto out;

	}



	if (!dev->of_node)

		return -ENODEV;



	led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);

	if (!led_data)

		return -ENOMEM;



	if (device_get_child_node_count(dev) != 1) {

		dev_err(dev, "Device must have exactly one LED sub-node.");

		return -EINVAL;

	}



	led_data->gpiod = devm_gpiod_get(dev, "lltc,ctrl", 0);

	if (IS_ERR(led_data->gpiod))

		return PTR_ERR(led_data->gpiod);



	child = device_get_next_child_node(dev, NULL);



	ret = fwnode_property_read_string(child, "label", &tmp);

	if (ret < 0)

		snprintf(led_data->name, sizeof(led_data->name),

			 "lt3593::");

	else

		snprintf(led_data->name, sizeof(led_data->name),

			 "lt3593:%s", tmp);



	fwnode_property_read_string(child, "linux,default-trigger",

				    &led_data->cdev.default_trigger);



	if (!fwnode_property_read_string(child, "default-state", &tmp)) {

		if (!strcmp(tmp, "keep")) {

			state = LEDS_GPIO_DEFSTATE_KEEP;

			flags = GPIOD_ASIS;

		} else if (!strcmp(tmp, "on")) {

			state = LEDS_GPIO_DEFSTATE_ON;

			flags = GPIOD_OUT_HIGH;

		}

	}



	led_data->cdev.name = led_data->name;

	led_data->cdev.brightness_set_blocking = lt3593_led_set;

	led_data->cdev.brightness = state ? LED_FULL : LED_OFF;



	ret = devm_led_classdev_register(dev, &led_data->cdev);

	if (ret < 0) {

		fwnode_handle_put(child);

		return ret;

	}



	led_data->cdev.dev->of_node = dev->of_node;



out:

	platform_set_drvdata(pdev, led_data);



	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id of_lt3593_leds_match[] = {

	{ .compatible = "lltc,lt3593", },

	{},

};

MODULE_DEVICE_TABLE(of, of_lt3593_leds_match);

#endif



static struct platform_driver lt3593_led_driver = {

	.probe		= lt3593_led_probe,

	.driver		= {

		.name	= "leds-lt3593",

		.of_match_table = of_match_ptr(of_lt3593_leds_match),

	},

};