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// SPDX-License-Identifier: GPL-2.0
/*
* Device driver for leds in MAX5970 and MAX5978 IC
*
* Copyright (c) 2022 9elements GmbH
*
* Author: Patrick Rudolph <patrick.rudolph@9elements.com>
*/
#include <linux/bits.h>
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/leds.h>
#include <linux/mfd/max5970.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#define ldev_to_maxled(c) container_of(c, struct max5970_led, cdev)
struct max5970_led {
struct device *dev;
struct regmap *regmap;
struct led_classdev cdev;
unsigned int index;
};
static int max5970_led_set_brightness(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct max5970_led *ddata = ldev_to_maxled(cdev);
int ret, val;
/* Set/clear corresponding bit for given led index */
val = !brightness ? BIT(ddata->index) : 0;
ret = regmap_update_bits(ddata->regmap, MAX5970_REG_LED_FLASH, BIT(ddata->index), val);
if (ret < 0)
dev_err(cdev->dev, "failed to set brightness %d", ret);
return ret;
}
static int max5970_led_probe(struct platform_device *pdev)
{
struct fwnode_handle *child;
struct device *dev = &pdev->dev;
struct regmap *regmap;
struct max5970_led *ddata;
int ret = -ENODEV;
regmap = dev_get_regmap(dev->parent, NULL);
if (!regmap)
return -ENODEV;
struct fwnode_handle *led_node __free(fwnode_handle) =
device_get_named_child_node(dev->parent, "leds");
if (!led_node)
return -ENODEV;
fwnode_for_each_available_child_node(led_node, child) {
u32 reg;
if (fwnode_property_read_u32(child, "reg", ®))
continue;
if (reg >= MAX5970_NUM_LEDS) {
dev_err_probe(dev, -EINVAL, "invalid LED (%u >= %d)\n", reg, MAX5970_NUM_LEDS);
continue;
}
ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata) {
fwnode_handle_put(child);
return -ENOMEM;
}
ddata->index = reg;
ddata->regmap = regmap;
ddata->dev = dev;
if (fwnode_property_read_string(child, "label", &ddata->cdev.name))
ddata->cdev.name = fwnode_get_name(child);
ddata->cdev.max_brightness = 1;
ddata->cdev.brightness_set_blocking = max5970_led_set_brightness;
ddata->cdev.default_trigger = "none";
ret = devm_led_classdev_register(dev, &ddata->cdev);
if (ret < 0) {
fwnode_handle_put(child);
return dev_err_probe(dev, ret, "Failed to initialize LED %u\n", reg);
}
}
return ret;
}
static struct platform_driver max5970_led_driver = {
.driver = {
.name = "max5970-led",
},
.probe = max5970_led_probe,
};
module_platform_driver(max5970_led_driver);
MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>");
MODULE_AUTHOR("Naresh Solanki <Naresh.Solanki@9elements.com>");
MODULE_DESCRIPTION("MAX5970_hot-swap controller LED driver");
MODULE_LICENSE("GPL");
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