Commit 736214b4 authored by Patrick Rudolph's avatar Patrick Rudolph Committed by Lee Jones
Browse files

leds: max5970: Add support for max5970 



The MAX5970 is hot swap controller and has 4 indication LED.

Signed-off-by: default avatarPatrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: default avatarNaresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20231123132803.1107174-1-naresh.solanki@9elements.com


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent 1b5c2fa7

drivers/leds/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/leds-max5970.c

0 → 100644
+109 −0
Original line number Diff line number Diff line 
// 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");