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leds: lt3593: Add device tree probing glue 

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

Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Daniel Mack 2018-06-27 20:52:36 +02:00 committed by Jacek Anaszewski
parent 73f103c952
commit 8cd7d6daba
1 changed files with 70 additions and 0 deletions
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70
drivers/leds/leds-lt3593.c
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@ -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),
},
};