leds: add driver for support Mellanox regmap LEDs for BMC and x86 platform (386570d7) · Commits · 戴 / test

MAINTAINERS

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		@@ -9003,6 +9003,7 @@ M: Vadim Pasternak <vadimp@mellanox.com>
		L: linux-leds@vger.kernel.org
		S: Supported
		F: drivers/leds/leds-mlxcpld.c
		F: drivers/leds/leds-mlxreg.c
		F: Documentation/leds/leds-mlxcpld.txt

		MELLANOX PLATFORM DRIVER

drivers/leds/Kconfig

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		@@ -694,6 +694,15 @@ config LEDS_MLXCPLD
		This option enables support for the LEDs on the Mellanox
		boards. Say Y to enable these.

		config LEDS_MLXREG
		tristate "LED support for the Mellanox switches management control"
		depends on LEDS_CLASS
		help
		This option enables support for the LEDs on the Mellanox Ethernet and
		InfiniBand switches. The driver can be activated by the platform device
		device add call. Say Y to enable these. To compile this driver as a
		module, choose 'M' here: the module will be called leds-mlxreg.

		config LEDS_USER
		tristate "Userspace LED support"
		depends on LEDS_CLASS

drivers/leds/Makefile

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		@@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_IS31FL319X) += leds-is31fl319x.o
		obj-$(CONFIG_LEDS_IS31FL32XX) += leds-is31fl32xx.o
		obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
		obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
		obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
		obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
		obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
		obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o

drivers/leds/leds-mlxreg.c

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		// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
		//
		// Copyright (c) 2018 Mellanox Technologies. All rights reserved.
		// Copyright (c) 2018 Vadim Pasternak <vadimp@mellanox.com>

		#include <linux/bitops.h>
		#include <linux/device.h>
		#include <linux/io.h>
		#include <linux/leds.h>
		#include <linux/module.h>
		#include <linux/of_device.h>
		#include <linux/platform_data/mlxreg.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>

		/* Codes for LEDs. */
		#define MLXREG_LED_OFFSET_BLINK_3HZ 0x01 /* Offset from solid: 3Hz blink */
		#define MLXREG_LED_OFFSET_BLINK_6HZ 0x02 /* Offset from solid: 6Hz blink */
		#define MLXREG_LED_IS_OFF 0x00 /* Off */
		#define MLXREG_LED_RED_SOLID 0x05 /* Solid red */
		#define MLXREG_LED_GREEN_SOLID 0x0D /* Solid green */
		#define MLXREG_LED_AMBER_SOLID 0x09 /* Solid amber */
		#define MLXREG_LED_BLINK_3HZ 167 /* ~167 msec off/on - HW support */
		#define MLXREG_LED_BLINK_6HZ 83 /* ~83 msec off/on - HW support */

		/**
		* struct mlxreg_led_data - led control data:
		*
		* @data: led configuration data;
		* @led_classdev: led class data;
		* @base_color: base led color (other colors have constant offset from base);
		* @led_data: led data;
		* @data_parent: pointer to private device control data of parent;
		*/
		struct mlxreg_led_data {
		struct mlxreg_core_data *data;
		struct led_classdev led_cdev;
		u8 base_color;
		void *data_parent;
		char led_cdev_name[MLXREG_CORE_LABEL_MAX_SIZE];
		};

		#define cdev_to_priv(c) container_of(c, struct mlxreg_led_data, led_cdev)

		/**
		* struct mlxreg_led_priv_data - platform private data:
		*
		* @pdev: platform device;
		* @pdata: platform data;
		* @access_lock: mutex for attribute IO access;
		*/
		struct mlxreg_led_priv_data {
		struct platform_device *pdev;
		struct mlxreg_core_platform_data *pdata;
		struct mutex access_lock; /* protect IO operations */
		};

		static int
		mlxreg_led_store_hw(struct mlxreg_led_data *led_data, u8 vset)
		{
		struct mlxreg_led_priv_data *priv = led_data->data_parent;
		struct mlxreg_core_platform_data *led_pdata = priv->pdata;
		struct mlxreg_core_data *data = led_data->data;
		u32 regval;
		u32 nib;
		int ret;

		/*
		* Each LED is controlled through low or high nibble of the relevant
		* register byte. Register offset is specified by off parameter.
		* Parameter vset provides color code: 0x0 for off, 0x5 for solid red,
		* 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink
		* green.
		* Parameter mask specifies which nibble is used for specific LED: mask
		* 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -
		* higher nibble (bits from 4 to 7).
		*/
		mutex_lock(&priv->access_lock);

		ret = regmap_read(led_pdata->regmap, data->reg, &regval);
		if (ret)
		goto access_error;

		nib = (ror32(data->mask, data->bit) == 0xf0) ? rol32(vset, data->bit) :
		rol32(vset, data->bit + 4);
		regval = (regval & data->mask) \| nib;

		ret = regmap_write(led_pdata->regmap, data->reg, regval);

		access_error:
		mutex_unlock(&priv->access_lock);

		return ret;
		}

		static enum led_brightness
		mlxreg_led_get_hw(struct mlxreg_led_data *led_data)
		{
		struct mlxreg_led_priv_data *priv = led_data->data_parent;
		struct mlxreg_core_platform_data *led_pdata = priv->pdata;
		struct mlxreg_core_data *data = led_data->data;
		u32 regval;
		int err;

		/*
		* Each LED is controlled through low or high nibble of the relevant
		* register byte. Register offset is specified by off parameter.
		* Parameter vset provides color code: 0x0 for off, 0x5 for solid red,
		* 0x6 for 3Hz blink red, 0xd for solid green, 0xe for 3Hz blink
		* green.
		* Parameter mask specifies which nibble is used for specific LED: mask
		* 0xf0 - lower nibble is to be used (bits from 0 to 3), mask 0x0f -
		* higher nibble (bits from 4 to 7).
		*/
		err = regmap_read(led_pdata->regmap, data->reg, &regval);
		if (err < 0) {
		dev_warn(led_data->led_cdev.dev, "Failed to get current brightness, error: %d\n",
		err);
		/* Assume the LED is OFF */
		return LED_OFF;
		}

		regval = regval & ~data->mask;
		regval = (ror32(data->mask, data->bit) == 0xf0) ? ror32(regval,
		data->bit) : ror32(regval, data->bit + 4);
		if (regval >= led_data->base_color &&
		regval <= (led_data->base_color + MLXREG_LED_OFFSET_BLINK_6HZ))
		return LED_FULL;

		return LED_OFF;
		}

		static int
		mlxreg_led_brightness_set(struct led_classdev *cled, enum led_brightness value)
		{
		struct mlxreg_led_data *led_data = cdev_to_priv(cled);

		if (value)
		return mlxreg_led_store_hw(led_data, led_data->base_color);
		else
		return mlxreg_led_store_hw(led_data, MLXREG_LED_IS_OFF);
		}

		static enum led_brightness
		mlxreg_led_brightness_get(struct led_classdev *cled)
		{
		struct mlxreg_led_data *led_data = cdev_to_priv(cled);

		return mlxreg_led_get_hw(led_data);
		}

		static int
		mlxreg_led_blink_set(struct led_classdev cled, unsigned long delay_on,
		unsigned long *delay_off)
		{
		struct mlxreg_led_data *led_data = cdev_to_priv(cled);
		int err;

		/*
		* HW supports two types of blinking: full (6Hz) and half (3Hz).
		* For delay on/off zero LED is setting to solid color. For others
		* combination blinking is to be controlled by the software timer.
		*/
		if (!(delay_on == 0 && delay_off == 0) &&
		!(*delay_on == MLXREG_LED_BLINK_3HZ &&
		*delay_off == MLXREG_LED_BLINK_3HZ) &&
		!(*delay_on == MLXREG_LED_BLINK_6HZ &&
		*delay_off == MLXREG_LED_BLINK_6HZ))
		return -EINVAL;

		if (*delay_on == MLXREG_LED_BLINK_6HZ)
		err = mlxreg_led_store_hw(led_data, led_data->base_color +
		MLXREG_LED_OFFSET_BLINK_6HZ);
		else if (*delay_on == MLXREG_LED_BLINK_3HZ)
		err = mlxreg_led_store_hw(led_data, led_data->base_color +
		MLXREG_LED_OFFSET_BLINK_3HZ);
		else
		err = mlxreg_led_store_hw(led_data, led_data->base_color);

		return err;
		}

		static int mlxreg_led_config(struct mlxreg_led_priv_data *priv)
		{
		struct mlxreg_core_platform_data *led_pdata = priv->pdata;
		struct mlxreg_core_data *data = led_pdata->data;
		struct mlxreg_led_data *led_data;
		struct led_classdev *led_cdev;
		enum led_brightness brightness;
		int i;
		int err;

		for (i = 0; i < led_pdata->counter; i++, data++) {
		led_data = devm_kzalloc(&priv->pdev->dev, sizeof(*led_data),
		GFP_KERNEL);
		if (!led_data)
		return -ENOMEM;

		led_cdev = &led_data->led_cdev;
		led_data->data_parent = priv;
		if (strstr(data->label, "red") \|\|
		strstr(data->label, "orange")) {
		brightness = LED_OFF;
		led_data->base_color = MLXREG_LED_RED_SOLID;
		} else if (strstr(data->label, "amber")) {
		brightness = LED_OFF;
		led_data->base_color = MLXREG_LED_AMBER_SOLID;
		} else {
		brightness = LED_OFF;
		led_data->base_color = MLXREG_LED_GREEN_SOLID;
		}
		sprintf(led_data->led_cdev_name, "%s:%s", "mlxreg",
		data->label);
		led_cdev->name = led_data->led_cdev_name;
		led_cdev->brightness = brightness;
		led_cdev->max_brightness = LED_ON;
		led_cdev->brightness_set_blocking =
		mlxreg_led_brightness_set;
		led_cdev->brightness_get = mlxreg_led_brightness_get;
		led_cdev->blink_set = mlxreg_led_blink_set;
		led_cdev->flags = LED_CORE_SUSPENDRESUME;
		led_data->data = data;
		err = devm_led_classdev_register(&priv->pdev->dev, led_cdev);
		if (err)
		return err;

		if (led_cdev->brightness)
		mlxreg_led_brightness_set(led_cdev,
		led_cdev->brightness);
		dev_info(led_cdev->dev, "label: %s, mask: 0x%02x, offset:0x%02x\n",
		data->label, data->mask, data->reg);
		}

		return 0;
		}

		static int mlxreg_led_probe(struct platform_device *pdev)
		{
		struct mlxreg_core_platform_data *led_pdata;
		struct mlxreg_led_priv_data *priv;

		led_pdata = dev_get_platdata(&pdev->dev);
		if (!led_pdata) {
		dev_err(&pdev->dev, "Failed to get platform data.\n");
		return -EINVAL;
		}

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

		mutex_init(&priv->access_lock);
		priv->pdev = pdev;
		priv->pdata = led_pdata;

		return mlxreg_led_config(priv);
		}

		static int mlxreg_led_remove(struct platform_device *pdev)
		{
		struct mlxreg_led_priv_data *priv = dev_get_drvdata(&pdev->dev);

		mutex_destroy(&priv->access_lock);

		return 0;
		}

		static struct platform_driver mlxreg_led_driver = {
		.driver = {
		.name = "leds-mlxreg",
		},
		.probe = mlxreg_led_probe,
		.remove = mlxreg_led_remove,
		};

		module_platform_driver(mlxreg_led_driver);

		MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
		MODULE_DESCRIPTION("Mellanox LED regmap driver");
		MODULE_LICENSE("Dual BSD/GPL");
		MODULE_ALIAS("platform:leds-mlxreg");

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