leds: add driver for Mellanox systems LEDs (be4fdf99) · Commits · 戴 / test

Documentation/leds/leds-mlxcpld.txt

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		Kernel driver for Mellanox systems LEDs
		=======================================

		Provide system LED support for the nex Mellanox systems:
		"msx6710", "msx6720", "msb7700", "msn2700", "msx1410",
		"msn2410", "msb7800", "msn2740", "msn2100".

		Description
		-----------
		Driver provides the following LEDs for the systems "msx6710", "msx6720",
		"msb7700", "msn2700", "msx1410", "msn2410", "msb7800", "msn2740":
		mlxcpld:fan1:green
		mlxcpld:fan1:red
		mlxcpld:fan2:green
		mlxcpld:fan2:red
		mlxcpld:fan3:green
		mlxcpld:fan3:red
		mlxcpld:fan4:green
		mlxcpld:fan4:red
		mlxcpld:psu:green
		mlxcpld:psu:red
		mlxcpld:status:green
		mlxcpld:status:red

		"status"
		CPLD reg offset: 0x20
		Bits [3:0]

		"psu"
		CPLD reg offset: 0x20
		Bits [7:4]

		"fan1"
		CPLD reg offset: 0x21
		Bits [3:0]

		"fan2"
		CPLD reg offset: 0x21
		Bits [7:4]

		"fan3"
		CPLD reg offset: 0x22
		Bits [3:0]

		"fan4"
		CPLD reg offset: 0x22
		Bits [7:4]

		Color mask for all the above LEDs:
		[bit3,bit2,bit1,bit0] or
		[bit7,bit6,bit5,bit4]:
		[0,0,0,0] = LED OFF
		[0,1,0,1] = Red static ON
		[1,1,0,1] = Green static ON
		[0,1,1,0] = Red blink 3Hz
		[1,1,1,0] = Green blink 3Hz
		[0,1,1,1] = Red blink 6Hz
		[1,1,1,1] = Green blink 6Hz

		Driver provides the following LEDs for the system "msn2100":
		mlxcpld:fan:green
		mlxcpld:fan:red
		mlxcpld:psu1:green
		mlxcpld:psu1:red
		mlxcpld:psu2:green
		mlxcpld:psu2:red
		mlxcpld:status:green
		mlxcpld:status:red
		mlxcpld:uid:blue

		"status"
		CPLD reg offset: 0x20
		Bits [3:0]

		"fan"
		CPLD reg offset: 0x21
		Bits [3:0]

		"psu1"
		CPLD reg offset: 0x23
		Bits [3:0]

		"psu2"
		CPLD reg offset: 0x23
		Bits [7:4]

		"uid"
		CPLD reg offset: 0x24
		Bits [3:0]

		Color mask for all the above LEDs, excepted uid:
		[bit3,bit2,bit1,bit0] or
		[bit7,bit6,bit5,bit4]:
		[0,0,0,0] = LED OFF
		[0,1,0,1] = Red static ON
		[1,1,0,1] = Green static ON
		[0,1,1,0] = Red blink 3Hz
		[1,1,1,0] = Green blink 3Hz
		[0,1,1,1] = Red blink 6Hz
		[1,1,1,1] = Green blink 6Hz

		Color mask for uid LED:
		[bit3,bit2,bit1,bit0]:
		[0,0,0,0] = LED OFF
		[1,1,0,1] = Blue static ON
		[1,1,1,0] = Blue blink 3Hz
		[1,1,1,1] = Blue blink 6Hz

		Driver supports HW blinking at 3Hz and 6Hz frequency (50% duty cycle).
		For 3Hz duty cylce is about 167 msec, for 6Hz is about 83 msec.

MAINTAINERS

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		@@ -7649,6 +7649,13 @@ W: http://www.mellanox.com
		Q: http://patchwork.ozlabs.org/project/netdev/list/
		F: drivers/net/ethernet/mellanox/mlxsw/

		MELLANOX MLXCPLD LED DRIVER
		M: Vadim Pasternak <vadimp@mellanox.com>
		L: linux-leds@vger.kernel.org
		S: Supported
		F: drivers/leds/leds-mlxcpld.c
		F: Documentation/leds/leds-mlxcpld.txt

		SOFT-ROCE DRIVER (rxe)
		M: Moni Shoua <monis@mellanox.com>
		L: linux-rdma@vger.kernel.org

drivers/leds/Kconfig

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		@@ -651,6 +651,14 @@ config LEDS_PM8058
		Choose this option if you want to use the LED drivers in
		the Qualcomm PM8058 PMIC.

		config LEDS_MLXCPLD
		tristate "LED support for the Mellanox boards"
		depends on X86_64 && DMI
		depends on LEDS_CLASS
		help
		This option enabled support for the LEDs on the Mellanox
		boards. Say Y to enabled these.

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

drivers/leds/Makefile

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		@@ -70,6 +70,7 @@ obj-$(CONFIG_LEDS_SEAD3) += leds-sead3.o
		obj-$(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

		# LED SPI Drivers
		obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o

drivers/leds/leds-mlxcpld.c

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		/*
		* drivers/leds/leds-mlxcpld.c
		* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
		* Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
		*
		* Redistribution and use in source and binary forms, with or without
		* modification, are permitted provided that the following conditions are met:
		*
		* 1. Redistributions of source code must retain the above copyright
		* notice, this list of conditions and the following disclaimer.
		* 2. Redistributions in binary form must reproduce the above copyright
		* notice, this list of conditions and the following disclaimer in the
		* documentation and/or other materials provided with the distribution.
		* 3. Neither the names of the copyright holders nor the names of its
		* contributors may be used to endorse or promote products derived from
		* this software without specific prior written permission.
		*
		* Alternatively, this software may be distributed under the terms of the
		* GNU General Public License ("GPL") version 2 as published by the Free
		* Software Foundation.
		*
		* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
		* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
		* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
		* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
		* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
		* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
		* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
		* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
		* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
		* POSSIBILITY OF SUCH DAMAGE.
		*/

		#include <linux/acpi.h>
		#include <linux/device.h>
		#include <linux/dmi.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/io.h>
		#include <linux/leds.h>
		#include <linux/module.h>
		#include <linux/mod_devicetable.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>

		#define MLXPLAT_CPLD_LPC_REG_BASE_ADRR 0x2500 /* LPC bus access */

		/* Color codes for LEDs */
		#define MLXCPLD_LED_OFFSET_HALF 0x01 /* Offset from solid: 3Hz blink */
		#define MLXCPLD_LED_OFFSET_FULL 0x02 /* Offset from solid: 6Hz blink */
		#define MLXCPLD_LED_IS_OFF 0x00 /* Off */
		#define MLXCPLD_LED_RED_STATIC_ON 0x05 /* Solid red */
		#define MLXCPLD_LED_RED_BLINK_HALF (MLXCPLD_LED_RED_STATIC_ON + \
		MLXCPLD_LED_OFFSET_HALF)
		#define MLXCPLD_LED_RED_BLINK_FULL (MLXCPLD_LED_RED_STATIC_ON + \
		MLXCPLD_LED_OFFSET_FULL)
		#define MLXCPLD_LED_GREEN_STATIC_ON 0x0D /* Solid green */
		#define MLXCPLD_LED_GREEN_BLINK_HALF (MLXCPLD_LED_GREEN_STATIC_ON + \
		MLXCPLD_LED_OFFSET_HALF)
		#define MLXCPLD_LED_GREEN_BLINK_FULL (MLXCPLD_LED_GREEN_STATIC_ON + \
		MLXCPLD_LED_OFFSET_FULL)
		#define MLXCPLD_LED_BLINK_3HZ 167 /* ~167 msec off/on */
		#define MLXCPLD_LED_BLINK_6HZ 83 /* ~83 msec off/on */

		/**
		* mlxcpld_param - LED access parameters:
		* @offset - offset for LED access in CPLD device
		* @mask - mask for LED access in CPLD device
		* @base_color - base color code for LED
		**/
		struct mlxcpld_param {
		u8 offset;
		u8 mask;
		u8 base_color;
		};

		/**
		* mlxcpld_led_priv - LED private data:
		* @cled - LED class device instance
		* @param - LED CPLD access parameters
		**/
		struct mlxcpld_led_priv {
		struct led_classdev cdev;
		struct mlxcpld_param param;
		};

		#define cdev_to_priv(c) container_of(c, struct mlxcpld_led_priv, cdev)

		/**
		* mlxcpld_led_profile - system LED profile (defined per system class):
		* @offset - offset for LED access in CPLD device
		* @mask - mask for LED access in CPLD device
		* @base_color - base color code
		* @brightness - default brightness setting (on/off)
		* @name - LED name
		**/
		struct mlxcpld_led_profile {
		u8 offset;
		u8 mask;
		u8 base_color;
		enum led_brightness brightness;
		const char *name;
		};

		/**
		* mlxcpld_led_pdata - system LED private data
		* @pdev - platform device pointer
		* @pled - LED class device instance
		* @profile - system configuration profile
		* @num_led_instances - number of LED instances
		* @lock - device access lock
		**/
		struct mlxcpld_led_pdata {
		struct platform_device *pdev;
		struct mlxcpld_led_priv *pled;
		struct mlxcpld_led_profile *profile;
		int num_led_instances;
		spinlock_t lock;
		};

		static struct mlxcpld_led_pdata *mlxcpld_led;

		/* Default profile fit the next Mellanox systems:
		* "msx6710", "msx6720", "msb7700", "msn2700", "msx1410",
		* "msn2410", "msb7800", "msn2740"
		*/
		static struct mlxcpld_led_profile mlxcpld_led_default_profile[] = {
		{
		0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan1:green",
		},
		{
		0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan1:red",
		},
		{
		0x21, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan2:green",
		},
		{
		0x21, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan2:red",
		},
		{
		0x22, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan3:green",
		},
		{
		0x22, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan3:red",
		},
		{
		0x22, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan4:green",
		},
		{
		0x22, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan4:red",
		},
		{
		0x20, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu:green",
		},
		{
		0x20, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu:red",
		},
		{
		0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:status:green",
		},
		{
		0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:status:red",
		},
		};

		/* Profile fit the Mellanox systems based on "msn2100" */
		static struct mlxcpld_led_profile mlxcpld_led_msn2100_profile[] = {
		{
		0x21, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:fan:green",
		},
		{
		0x21, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:fan:red",
		},
		{
		0x23, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu1:green",
		},
		{
		0x23, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu1:red",
		},
		{
		0x23, 0x0f, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:psu2:green",
		},
		{
		0x23, 0x0f, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:psu2:red",
		},
		{
		0x20, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, 1,
		"mlxcpld:status:green",
		},
		{
		0x20, 0xf0, MLXCPLD_LED_RED_STATIC_ON, LED_OFF,
		"mlxcpld:status:red",
		},
		{
		0x24, 0xf0, MLXCPLD_LED_GREEN_STATIC_ON, LED_OFF,
		"mlxcpld:uid:blue",
		},
		};

		enum mlxcpld_led_platform_types {
		MLXCPLD_LED_PLATFORM_DEFAULT,
		MLXCPLD_LED_PLATFORM_MSN2100,
		};

		static const char *mlx_product_names[] = {
		"DEFAULT",
		"MSN2100",
		};

		static enum
		mlxcpld_led_platform_types mlxcpld_led_platform_check_sys_type(void)
		{
		const char *mlx_product_name;
		int i;

		mlx_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
		if (!mlx_product_name)
		return MLXCPLD_LED_PLATFORM_DEFAULT;

		for (i = 1; i < ARRAY_SIZE(mlx_product_names); i++) {
		if (strstr(mlx_product_name, mlx_product_names[i]))
		return i;
		}

		return MLXCPLD_LED_PLATFORM_DEFAULT;
		}

		static void mlxcpld_led_bus_access_func(u16 base, u8 offset, u8 rw_flag,
		u8 *data)
		{
		u32 addr = base + offset;

		if (rw_flag == 0)
		outb(*data, addr);
		else
		*data = inb(addr);
		}

		static void mlxcpld_led_store_hw(u8 mask, u8 off, u8 vset)
		{
		u8 nib, val;

		/*
		* Each LED is controlled through low or high nibble of the relevant
		* CPLD register. 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).
		*/
		spin_lock(&mlxcpld_led->lock);
		mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 1,
		&val);
		nib = (mask == 0xf0) ? vset : (vset << 4);
		val = (val & mask) \| nib;
		mlxcpld_led_bus_access_func(MLXPLAT_CPLD_LPC_REG_BASE_ADRR, off, 0,
		&val);
		spin_unlock(&mlxcpld_led->lock);
		}

		static void mlxcpld_led_brightness_set(struct led_classdev *led,
		enum led_brightness value)
		{
		struct mlxcpld_led_priv *pled = cdev_to_priv(led);

		if (value) {
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
		pled->param.base_color);
		return;
		}

		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
		MLXCPLD_LED_IS_OFF);
		}

		static int mlxcpld_led_blink_set(struct led_classdev *led,
		unsigned long *delay_on,
		unsigned long *delay_off)
		{
		struct mlxcpld_led_priv *pled = cdev_to_priv(led);

		/*
		* HW supports two types of blinking: full (6Hz) and half (3Hz).
		* For delay on/off zero default setting 3Hz is used.
		*/
		if (!(delay_on == 0 && delay_off == 0) &&
		!(*delay_on == MLXCPLD_LED_BLINK_3HZ &&
		*delay_off == MLXCPLD_LED_BLINK_3HZ) &&
		!(*delay_on == MLXCPLD_LED_BLINK_6HZ &&
		*delay_off == MLXCPLD_LED_BLINK_6HZ))
		return -EINVAL;

		if (*delay_on == MLXCPLD_LED_BLINK_6HZ)
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
		pled->param.base_color +
		MLXCPLD_LED_OFFSET_FULL);
		else
		mlxcpld_led_store_hw(pled->param.mask, pled->param.offset,
		pled->param.base_color +
		MLXCPLD_LED_OFFSET_HALF);

		return 0;
		}

		static int mlxcpld_led_config(struct device *dev,
		struct mlxcpld_led_pdata *cpld)
		{
		int i;
		int err;

		cpld->pled = devm_kzalloc(dev, sizeof(struct mlxcpld_led_priv) *
		cpld->num_led_instances, GFP_KERNEL);
		if (!cpld->pled)
		return -ENOMEM;

		for (i = 0; i < cpld->num_led_instances; i++) {
		cpld->pled[i].cdev.name = cpld->profile[i].name;
		cpld->pled[i].cdev.brightness = cpld->profile[i].brightness;
		cpld->pled[i].cdev.max_brightness = 1;
		cpld->pled[i].cdev.brightness_set = mlxcpld_led_brightness_set;
		cpld->pled[i].cdev.blink_set = mlxcpld_led_blink_set;
		cpld->pled[i].cdev.flags = LED_CORE_SUSPENDRESUME;
		err = devm_led_classdev_register(dev, &cpld->pled[i].cdev);
		if (err)
		return err;

		cpld->pled[i].param.offset = mlxcpld_led->profile[i].offset;
		cpld->pled[i].param.mask = mlxcpld_led->profile[i].mask;
		cpld->pled[i].param.base_color =
		mlxcpld_led->profile[i].base_color;

		if (mlxcpld_led->profile[i].brightness)
		mlxcpld_led_brightness_set(&cpld->pled[i].cdev,
		mlxcpld_led->profile[i].brightness);
		}

		return 0;
		}

		static int __init mlxcpld_led_probe(struct platform_device *pdev)
		{
		enum mlxcpld_led_platform_types mlxcpld_led_plat =
		mlxcpld_led_platform_check_sys_type();

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

		mlxcpld_led->pdev = pdev;

		switch (mlxcpld_led_plat) {
		case MLXCPLD_LED_PLATFORM_MSN2100:
		mlxcpld_led->profile = mlxcpld_led_msn2100_profile;
		mlxcpld_led->num_led_instances =
		ARRAY_SIZE(mlxcpld_led_msn2100_profile);
		break;

		default:
		mlxcpld_led->profile = mlxcpld_led_default_profile;
		mlxcpld_led->num_led_instances =
		ARRAY_SIZE(mlxcpld_led_default_profile);
		break;
		}

		spin_lock_init(&mlxcpld_led->lock);

		return mlxcpld_led_config(&pdev->dev, mlxcpld_led);
		}

		static struct platform_driver mlxcpld_led_driver = {
		.driver = {
		.name = KBUILD_MODNAME,
		},
		};

		static int __init mlxcpld_led_init(void)
		{
		struct platform_device *pdev;
		int err;

		pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
		if (IS_ERR(pdev)) {
		pr_err("Device allocation failed\n");
		return PTR_ERR(pdev);
		}

		err = platform_driver_probe(&mlxcpld_led_driver, mlxcpld_led_probe);
		if (err) {
		pr_err("Probe platform driver failed\n");
		platform_device_unregister(pdev);
		}

		return err;
		}

		static void __exit mlxcpld_led_exit(void)
		{
		platform_device_unregister(mlxcpld_led->pdev);
		platform_driver_unregister(&mlxcpld_led_driver);
		}

		module_init(mlxcpld_led_init);
		module_exit(mlxcpld_led_exit);

		MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
		MODULE_DESCRIPTION("Mellanox board LED driver");
		MODULE_LICENSE("GPL v2");
		MODULE_ALIAS("platform:leds_mlxcpld");

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