leds: max77650: Add LEDs support (5be102eb) · Commits · 戴 / test

drivers/leds/Kconfig

+6 −0

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		@@ -608,6 +608,12 @@ config LEDS_TLC591XX
		This option enables support for Texas Instruments TLC59108
		and TLC59116 LED controllers.

		config LEDS_MAX77650
		tristate "LED support for Maxim MAX77650 PMIC"
		depends on LEDS_CLASS && MFD_MAX77650
		help
		LEDs driver for MAX77650 family of PMICs from Maxim Integrated.

		config LEDS_MAX77693
		tristate "LED support for MAX77693 Flash"
		depends on LEDS_CLASS_FLASH

drivers/leds/Makefile

+1 −0

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		@@ -61,6 +61,7 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
		obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
		obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
		obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
		obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
		obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o
		obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
		obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o

drivers/leds/leds-max77650.c

0 → 100644

+147 −0

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		// SPDX-License-Identifier: GPL-2.0
		//
		// Copyright (C) 2018 BayLibre SAS
		// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
		//
		// LED driver for MAXIM 77650/77651 charger/power-supply.

		#include <linux/i2c.h>
		#include <linux/leds.h>
		#include <linux/mfd/max77650.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>

		#define MAX77650_LED_NUM_LEDS 3

		#define MAX77650_LED_A_BASE 0x40
		#define MAX77650_LED_B_BASE 0x43

		#define MAX77650_LED_BR_MASK GENMASK(4, 0)
		#define MAX77650_LED_EN_MASK GENMASK(7, 6)

		#define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK

		/* Enable EN_LED_MSTR. */
		#define MAX77650_LED_TOP_DEFAULT BIT(0)

		#define MAX77650_LED_ENABLE GENMASK(7, 6)
		#define MAX77650_LED_DISABLE 0x00

		#define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE
		/* 100% on duty */
		#define MAX77650_LED_B_DEFAULT GENMASK(3, 0)

		struct max77650_led {
		struct led_classdev cdev;
		struct regmap *map;
		unsigned int regA;
		unsigned int regB;
		};

		static struct max77650_led max77650_to_led(struct led_classdev cdev)
		{
		return container_of(cdev, struct max77650_led, cdev);
		}

		static int max77650_led_brightness_set(struct led_classdev *cdev,
		enum led_brightness brightness)
		{
		struct max77650_led *led = max77650_to_led(cdev);
		int val, mask;

		mask = MAX77650_LED_BR_MASK \| MAX77650_LED_EN_MASK;

		if (brightness == LED_OFF)
		val = MAX77650_LED_DISABLE;
		else
		val = MAX77650_LED_ENABLE \| brightness;

		return regmap_update_bits(led->map, led->regA, mask, val);
		}

		static int max77650_led_probe(struct platform_device *pdev)
		{
		struct device_node of_node, child;
		struct max77650_led leds, led;
		struct device *parent;
		struct device *dev;
		struct regmap *map;
		const char *label;
		int rv, num_leds;
		u32 reg;

		dev = &pdev->dev;
		parent = dev->parent;
		of_node = dev->of_node;

		if (!of_node)
		return -ENODEV;

		leds = devm_kcalloc(dev, sizeof(*leds),
		MAX77650_LED_NUM_LEDS, GFP_KERNEL);
		if (!leds)
		return -ENOMEM;

		map = dev_get_regmap(dev->parent, NULL);
		if (!map)
		return -ENODEV;

		num_leds = of_get_child_count(of_node);
		if (!num_leds \|\| num_leds > MAX77650_LED_NUM_LEDS)
		return -ENODEV;

		for_each_child_of_node(of_node, child) {
		rv = of_property_read_u32(child, "reg", &reg);
		if (rv \|\| reg >= MAX77650_LED_NUM_LEDS)
		return -EINVAL;

		led = &leds[reg];
		led->map = map;
		led->regA = MAX77650_LED_A_BASE + reg;
		led->regB = MAX77650_LED_B_BASE + reg;
		led->cdev.brightness_set_blocking = max77650_led_brightness_set;
		led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;

		label = of_get_property(child, "label", NULL);
		if (!label) {
		led->cdev.name = "max77650::";
		} else {
		led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
		"max77650:%s", label);
		if (!led->cdev.name)
		return -ENOMEM;
		}

		of_property_read_string(child, "linux,default-trigger",
		&led->cdev.default_trigger);

		rv = devm_of_led_classdev_register(dev, child, &led->cdev);
		if (rv)
		return rv;

		rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
		if (rv)
		return rv;

		rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
		if (rv)
		return rv;
		}

		return regmap_write(map,
		MAX77650_REG_CNFG_LED_TOP,
		MAX77650_LED_TOP_DEFAULT);
		}

		static struct platform_driver max77650_led_driver = {
		.driver = {
		.name = "max77650-led",
		},
		.probe = max77650_led_probe,
		};
		module_platform_driver(max77650_led_driver);

		MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
		MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
		MODULE_LICENSE("GPL v2");

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