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leds: max5970: Add support for max5970
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The MAX5970 is hot swap controller and has 4 indication LED.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20231123132803.1107174-1-naresh.solanki@9elements.com
Signed-off-by: Lee Jones <lee@kernel.org>
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PatrickRudolph authored and lag-linaro committed Dec 13, 2023
1 parent 1b5c2fa commit 736214b
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11 changes: 11 additions & 0 deletions drivers/leds/Kconfig
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Expand Up @@ -648,6 +648,17 @@ config LEDS_ADP5520
To compile this driver as a module, choose M here: the module will
be called leds-adp5520.

config LEDS_MAX5970
tristate "LED Support for Maxim 5970"
depends on LEDS_CLASS
depends on MFD_MAX5970
help
This option enables support for the Maxim MAX5970 & MAX5978 smart
switch indication LEDs via the I2C bus.

To compile this driver as a module, choose M here: the module will
be called leds-max5970.

config LEDS_MC13783
tristate "LED Support for MC13XXX PMIC"
depends on LEDS_CLASS
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1 change: 1 addition & 0 deletions drivers/leds/Makefile
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Expand Up @@ -56,6 +56,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
obj-$(CONFIG_LEDS_MAX5970) += leds-max5970.o
obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
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109 changes: 109 additions & 0 deletions drivers/leds/leds-max5970.c
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@@ -0,0 +1,109 @@
// 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/leds.h>
#include <linux/mfd/max5970.h>
#include <linux/of.h>
#include <linux/platform_device.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 device *dev = &pdev->dev;
struct device_node *np = dev_of_node(dev->parent);
struct regmap *regmap;
struct device_node *led_node, *child;
struct max5970_led *ddata;
int ret = -ENODEV, num_leds = 0;

regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap)
return -ENODEV;

led_node = of_get_child_by_name(np, "leds");
if (!led_node)
return -ENODEV;

for_each_available_child_of_node(led_node, child) {
u32 reg;

if (of_property_read_u32(child, "reg", &reg))
continue;

if (reg >= MAX5970_NUM_LEDS) {
dev_err(dev, "invalid LED (%u >= %d)\n", reg, MAX5970_NUM_LEDS);
continue;
}

ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata) {
of_node_put(child);
return -ENOMEM;
}

ddata->index = reg;
ddata->regmap = regmap;
ddata->dev = dev;

if (of_property_read_string(child, "label", &ddata->cdev.name))
ddata->cdev.name = child->name;

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) {
of_node_put(child);
dev_err(dev, "Failed to initialize LED %u\n", reg);
return ret;
}
num_leds++;
}

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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