leds: lm36274: Introduce the TI LM36274 LED driver (11e1bbc1) · Commits · 戴 / test

drivers/leds/Kconfig

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		@@ -800,6 +800,14 @@ config LEDS_LM3697
		Say Y to enable the LM3697 LED driver for TI LMU devices.
		This supports the LED device LM3697.

		config LEDS_LM36274
		tristate "LED driver for LM36274"
		depends on LEDS_TI_LMU_COMMON
		depends on MFD_TI_LMU
		help
		Say Y to enable the LM36274 LED driver for TI LMU devices.
		This supports the LED device LM36274.

		comment "LED Triggers"
		source "drivers/leds/trigger/Kconfig"

drivers/leds/Makefile

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		@@ -83,6 +83,7 @@ obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
		obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
		obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o
		obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o
		obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o

		# LED SPI Drivers
		obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o

drivers/leds/leds-lm36274.c

0 → 100644

+172 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// TI LM36274 LED chip family driver
		// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/

		#include <linux/bitops.h>
		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/leds.h>
		#include <linux/leds-ti-lmu-common.h>
		#include <linux/module.h>
		#include <linux/of_device.h>
		#include <linux/platform_device.h>

		#include <linux/mfd/ti-lmu.h>
		#include <linux/mfd/ti-lmu-register.h>

		#include <uapi/linux/uleds.h>

		#define LM36274_MAX_STRINGS 4
		#define LM36274_BL_EN BIT(4)

		/**
		* struct lm36274
		* @pdev: platform device
		* @led_dev: led class device
		* @lmu_data: Register and setting values for common code
		* @regmap: Devices register map
		* @dev: Pointer to the devices device struct
		* @led_sources - The LED strings supported in this array
		* @num_leds - Number of LED strings are supported in this array
		*/
		struct lm36274 {
		struct platform_device *pdev;
		struct led_classdev led_dev;
		struct ti_lmu_bank lmu_data;
		struct regmap *regmap;
		struct device *dev;

		u32 led_sources[LM36274_MAX_STRINGS];
		int num_leds;
		};

		static int lm36274_brightness_set(struct led_classdev *led_cdev,
		enum led_brightness brt_val)
		{
		struct lm36274 *led = container_of(led_cdev, struct lm36274, led_dev);

		return ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
		}

		static int lm36274_init(struct lm36274 *lm36274_data)
		{
		int enable_val = 0;
		int i;

		for (i = 0; i < lm36274_data->num_leds; i++)
		enable_val \|= (1 << lm36274_data->led_sources[i]);

		if (!enable_val) {
		dev_err(lm36274_data->dev, "No LEDs were enabled\n");
		return -EINVAL;
		}

		enable_val \|= LM36274_BL_EN;

		return regmap_write(lm36274_data->regmap, LM36274_REG_BL_EN,
		enable_val);
		}

		static int lm36274_parse_dt(struct lm36274 *lm36274_data)
		{
		struct fwnode_handle *child = NULL;
		char label[LED_MAX_NAME_SIZE];
		struct device *dev = &lm36274_data->pdev->dev;
		const char *name;
		int child_cnt;
		int ret = -EINVAL;

		/* There should only be 1 node */
		child_cnt = device_get_child_node_count(dev);
		if (child_cnt != 1)
		return -EINVAL;

		device_for_each_child_node(dev, child) {
		ret = fwnode_property_read_string(child, "label", &name);
		if (ret)
		snprintf(label, sizeof(label),
		"%s::", lm36274_data->pdev->name);
		else
		snprintf(label, sizeof(label),
		"%s:%s", lm36274_data->pdev->name, name);

		lm36274_data->num_leds = fwnode_property_read_u32_array(child,
		"led-sources",
		NULL, 0);
		if (lm36274_data->num_leds <= 0)
		return -ENODEV;

		ret = fwnode_property_read_u32_array(child, "led-sources",
		lm36274_data->led_sources,
		lm36274_data->num_leds);
		if (ret) {
		dev_err(dev, "led-sources property missing\n");
		return ret;
		}

		fwnode_property_read_string(child, "linux,default-trigger",
		&lm36274_data->led_dev.default_trigger);

		}

		lm36274_data->lmu_data.regmap = lm36274_data->regmap;
		lm36274_data->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT;
		lm36274_data->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB;
		lm36274_data->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB;

		lm36274_data->led_dev.name = label;
		lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT;
		lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set;

		return 0;
		}

		static int lm36274_probe(struct platform_device *pdev)
		{
		struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
		struct lm36274 *lm36274_data;
		int ret;

		lm36274_data = devm_kzalloc(&pdev->dev, sizeof(*lm36274_data),
		GFP_KERNEL);
		if (!lm36274_data)
		return -ENOMEM;

		lm36274_data->pdev = pdev;
		lm36274_data->dev = lmu->dev;
		lm36274_data->regmap = lmu->regmap;
		dev_set_drvdata(&pdev->dev, lm36274_data);

		ret = lm36274_parse_dt(lm36274_data);
		if (ret) {
		dev_err(lm36274_data->dev, "Failed to parse DT node\n");
		return ret;
		}

		ret = lm36274_init(lm36274_data);
		if (ret) {
		dev_err(lm36274_data->dev, "Failed to init the device\n");
		return ret;
		}

		return devm_led_classdev_register(lm36274_data->dev,
		&lm36274_data->led_dev);
		}

		static const struct of_device_id of_lm36274_leds_match[] = {
		{ .compatible = "ti,lm36274-backlight", },
		{},
		};
		MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);

		static struct platform_driver lm36274_driver = {
		.probe = lm36274_probe,
		.driver = {
		.name = "lm36274-leds",
		},
		};
		module_platform_driver(lm36274_driver)

		MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver");
		MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
		MODULE_LICENSE("GPL v2");

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