leds: add sgm3140 driver (cef8ec8c) · Commits · 戴 / test

drivers/leds/Kconfig

+8 −0

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		@@ -868,6 +868,14 @@ config LEDS_IP30
		To compile this driver as a module, choose M here: the module
		will be called leds-ip30.

		config LEDS_SGM3140
		tristate "LED support for the SGM3140"
		depends on LEDS_CLASS_FLASH
		depends on V4L2_FLASH_LED_CLASS \|\| !V4L2_FLASH_LED_CLASS
		help
		This option enables support for the SGM3140 500mA Buck/Boost Charge
		Pump LED Driver.

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

drivers/leds/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -78,6 +78,7 @@ obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
		obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o
		obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
		obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
		obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
		obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
		obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o
		obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o

drivers/leds/leds-sgm3140.c

0 → 100644

+320 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz>

		#include <linux/gpio/consumer.h>
		#include <linux/led-class-flash.h>
		#include <linux/module.h>
		#include <linux/regulator/consumer.h>
		#include <linux/platform_device.h>

		#include <media/v4l2-flash-led-class.h>

		#define FLASH_TIMEOUT_DEFAULT 250000U /* 250ms */
		#define FLASH_MAX_TIMEOUT_DEFAULT 300000U /* 300ms */

		struct sgm3140 {
		struct led_classdev_flash fled_cdev;
		struct v4l2_flash *v4l2_flash;

		struct timer_list powerdown_timer;

		struct gpio_desc *flash_gpio;
		struct gpio_desc *enable_gpio;
		struct regulator *vin_regulator;

		bool enabled;

		/* current timeout in us */
		u32 timeout;
		/* maximum timeout in us */
		u32 max_timeout;
		};

		static struct sgm3140 flcdev_to_sgm3140(struct led_classdev_flash flcdev)
		{
		return container_of(flcdev, struct sgm3140, fled_cdev);
		}

		static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
		{
		struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
		int ret;

		if (priv->enabled == state)
		return 0;

		if (state) {
		ret = regulator_enable(priv->vin_regulator);
		if (ret) {
		dev_err(fled_cdev->led_cdev.dev,
		"failed to enable regulator: %d\n", ret);
		return ret;
		}
		gpiod_set_value_cansleep(priv->flash_gpio, 1);
		gpiod_set_value_cansleep(priv->enable_gpio, 1);
		mod_timer(&priv->powerdown_timer,
		jiffies + usecs_to_jiffies(priv->timeout));
		} else {
		del_timer_sync(&priv->powerdown_timer);
		gpiod_set_value_cansleep(priv->enable_gpio, 0);
		gpiod_set_value_cansleep(priv->flash_gpio, 0);
		ret = regulator_disable(priv->vin_regulator);
		if (ret) {
		dev_err(fled_cdev->led_cdev.dev,
		"failed to disable regulator: %d\n", ret);
		return ret;
		}
		}

		priv->enabled = state;

		return 0;
		}

		static int sgm3140_strobe_get(struct led_classdev_flash fled_cdev, bool state)
		{
		struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);

		*state = timer_pending(&priv->powerdown_timer);

		return 0;
		}

		static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev,
		u32 timeout)
		{
		struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);

		priv->timeout = timeout;

		return 0;
		}

		static const struct led_flash_ops sgm3140_flash_ops = {
		.strobe_set = sgm3140_strobe_set,
		.strobe_get = sgm3140_strobe_get,
		.timeout_set = sgm3140_timeout_set,
		};

		static int sgm3140_brightness_set(struct led_classdev *led_cdev,
		enum led_brightness brightness)
		{
		struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
		struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
		bool enable = brightness == LED_ON;
		int ret;

		if (priv->enabled == enable)
		return 0;

		if (enable) {
		ret = regulator_enable(priv->vin_regulator);
		if (ret) {
		dev_err(led_cdev->dev,
		"failed to enable regulator: %d\n", ret);
		return ret;
		}
		gpiod_set_value_cansleep(priv->enable_gpio, 1);
		} else {
		gpiod_set_value_cansleep(priv->enable_gpio, 0);
		ret = regulator_disable(priv->vin_regulator);
		if (ret) {
		dev_err(led_cdev->dev,
		"failed to disable regulator: %d\n", ret);
		return ret;
		}
		}

		priv->enabled = enable;

		return 0;
		}

		static void sgm3140_powerdown_timer(struct timer_list *t)
		{
		struct sgm3140 *priv = from_timer(priv, t, powerdown_timer);

		gpiod_set_value(priv->enable_gpio, 0);
		gpiod_set_value(priv->flash_gpio, 0);
		regulator_disable(priv->vin_regulator);

		priv->enabled = false;
		}

		static void sgm3140_init_flash_timeout(struct sgm3140 *priv)
		{
		struct led_classdev_flash *fled_cdev = &priv->fled_cdev;
		struct led_flash_setting *s;

		/* Init flash timeout setting */
		s = &fled_cdev->timeout;
		s->min = 1;
		s->max = priv->max_timeout;
		s->step = 1;
		s->val = FLASH_TIMEOUT_DEFAULT;
		}

		#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
		static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
		struct v4l2_flash_config *v4l2_sd_cfg)
		{
		struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev;
		struct led_flash_setting *s;

		strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
		sizeof(v4l2_sd_cfg->dev_name));

		/* Init flash intensity setting */
		s = &v4l2_sd_cfg->intensity;
		s->min = 0;
		s->max = 1;
		s->step = 1;
		s->val = 1;
		}

		#else
		static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
		struct v4l2_flash_config *v4l2_sd_cfg)
		{
		}
		#endif

		static int sgm3140_probe(struct platform_device *pdev)
		{
		struct sgm3140 *priv;
		struct led_classdev *led_cdev;
		struct led_classdev_flash *fled_cdev;
		struct led_init_data init_data = {};
		struct fwnode_handle *child_node;
		struct v4l2_flash_config v4l2_sd_cfg = {};
		int ret;

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

		priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW);
		ret = PTR_ERR_OR_ZERO(priv->flash_gpio);
		if (ret) {
		if (ret != -EPROBE_DEFER)
		dev_err(&pdev->dev,
		"Failed to request flash gpio: %d\n", ret);
		return ret;
		}

		priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
		ret = PTR_ERR_OR_ZERO(priv->enable_gpio);
		if (ret) {
		if (ret != -EPROBE_DEFER)
		dev_err(&pdev->dev,
		"Failed to request enable gpio: %d\n", ret);
		return ret;
		}

		priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin");
		ret = PTR_ERR_OR_ZERO(priv->vin_regulator);
		if (ret) {
		if (ret != -EPROBE_DEFER)
		dev_err(&pdev->dev,
		"Failed to request regulator: %d\n", ret);
		return ret;
		}

		child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode,
		NULL);
		if (!child_node) {
		dev_err(&pdev->dev,
		"No fwnode child node found for connected LED.\n");
		return -EINVAL;
		}

		ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us",
		&priv->max_timeout);
		if (ret) {
		priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT;
		dev_warn(&pdev->dev,
		"flash-max-timeout-us property missing\n");
		}

		/*
		* Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout
		* from DT is lower.
		*/
		priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);

		timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0);

		fled_cdev = &priv->fled_cdev;
		led_cdev = &fled_cdev->led_cdev;

		fled_cdev->ops = &sgm3140_flash_ops;

		led_cdev->brightness_set_blocking = sgm3140_brightness_set;
		led_cdev->max_brightness = LED_ON;
		led_cdev->flags \|= LED_DEV_CAP_FLASH;

		sgm3140_init_flash_timeout(priv);

		init_data.fwnode = child_node;

		platform_set_drvdata(pdev, priv);

		/* Register in the LED subsystem */
		ret = devm_led_classdev_flash_register_ext(&pdev->dev,
		fled_cdev, &init_data);
		if (ret) {
		dev_err(&pdev->dev, "Failed to register flash device: %d\n",
		ret);
		goto err;
		}

		sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg);

		/* Create V4L2 Flash subdev */
		priv->v4l2_flash = v4l2_flash_init(&pdev->dev,
		child_node,
		fled_cdev, NULL,
		&v4l2_sd_cfg);
		if (IS_ERR(priv->v4l2_flash)) {
		ret = PTR_ERR(priv->v4l2_flash);
		goto err;
		}

		return ret;

		err:
		fwnode_handle_put(child_node);
		return ret;
		}

		static int sgm3140_remove(struct platform_device *pdev)
		{
		struct sgm3140 *priv = platform_get_drvdata(pdev);

		del_timer_sync(&priv->powerdown_timer);

		v4l2_flash_release(priv->v4l2_flash);

		return 0;
		}

		static const struct of_device_id sgm3140_dt_match[] = {
		{ .compatible = "sgmicro,sgm3140" },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, sgm3140_dt_match);

		static struct platform_driver sgm3140_driver = {
		.probe = sgm3140_probe,
		.remove = sgm3140_remove,
		.driver = {
		.name = "sgm3140",
		.of_match_table = sgm3140_dt_match,
		},
		};

		module_platform_driver(sgm3140_driver);

		MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>");
		MODULE_DESCRIPTION("SG Micro SGM3140 charge pump led driver");
		MODULE_LICENSE("GPL v2");

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