sonic-buildimage/platform/nephos/sonic-platform-modules-cig/cs6436-56p/modules/x86-64-cig-cs6436-56p-led.c

/*
 * A hwmon driver for the CIG cs6436-56P LED
 *
 * Copyright (C) 2018 Cambridge, Inc.

 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*#define DEBUG*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/dmi.h>

extern  int cig_cpld_write_register(u8 reg_off, u8 val);

extern int cig_cpld_read_register(u8 reg_off, u8 *val);

extern void led_classdev_unregister(struct led_classdev *led_cdev);
extern int led_classdev_register(struct device *parent, struct led_classdev *led_cdev);
extern void led_classdev_resume(struct led_classdev *led_cdev);
extern void led_classdev_suspend(struct led_classdev *led_cdev);

#define DRVNAME "cs6436_56p_led"

struct cs6436_56p_led_data {
    struct platform_device *pdev;
    struct mutex	 update_lock;
    char			 valid;		   /* != 0 if registers are valid */
    unsigned long	last_updated;	/* In jiffies */
    u8			   reg_val[6];	  /* 0: system & location
	                                 1: PSU1 &PSU12
	                                 2: fan & management
	                                 3: console & ToD
	                                 4-5 : fan1-fan5*/
};

static struct cs6436_56p_led_data  *ledctl = NULL;

/* LED related data
 */
#define LED_TYPE_PSU1_REG_MASK   0x0C
#define LED_MODE_PSU1_GREEN_MASK 0x08
#define LED_MODE_PSU1_RED_MASK 	 0x04
#define LED_MODE_PSU1_AMBER_MASK 0x0C
#define LED_MODE_PSU1_OFF_MASK   0x00

#define LED_TYPE_PSU2_REG_MASK   0x30
#define LED_MODE_PSU2_GREEN_MASK 0x20
#define LED_MODE_PSU2_RED_MASK   0x10
#define LED_MODE_PSU2_AMBER_MASK 0x30
#define LED_MODE_PSU2_OFF_MASK   0x00

#define LED_TYPE_SYS_REG_MASK    0xF0
#define LED_MODE_SYS_GREEN_MASK  0x40
#define LED_MODE_SYS_RED_MASK    0x20
#define LED_MODE_SYS_AMBER_MASK  0x60
#define LED_MODE_SYS_AMBER_FLASHING_MASK   0x70
#define LED_MODE_SYS_OFF_MASK    0x00

#define LED_TYPE_RES_REG_MASK     0x0F
#define LED_MODE_RES_GREEN_MASK   0x04
#define LED_MODE_RES_RED_MASK     0x02
#define LED_MODE_RES_AMBER_MASK   0x06
#define LED_MODE_RES_AMBER_FLASHING_MASK   0x07
#define LED_MODE_RES_OFF_MASK     0x00

#define LED_TYPE_FAN_REG_MASK     0x03
#define LED_MODE_FAN_GREEN_MASK   0x02
#define LED_MODE_FAN_RED_MASK     0x01
#define LED_MODE_FAN_AMBER_MASK   0x03
#define LED_MODE_FAN_OFF_MASK     0x00

#define LED_TYPE_FAN1_REG_MASK    0x03
#define LED_TYPE_FAN2_REG_MASK    0x0C
#define LED_TYPE_FAN3_REG_MASK    0x30
#define LED_TYPE_FAN4_REG_MASK    0xC0
#define LED_TYPE_FAN5_REG_MASK    0x03

#define LED_MODE_FANX_GREEN_MASK   0x02
#define LED_MODE_FANX_RED_MASK     0x01
#define LED_MODE_FANX_AMBER_MASK   0x03
#define LED_MODE_FANX_OFF_MASK     0x00

enum led_type {
    LED_TYPE_SYS,
	LED_TYPE_PSU2,
	LED_TYPE_PSU1,
	LED_TYPE_FAN,
    LED_TYPE_FAN1,
    LED_TYPE_FAN2,
    LED_TYPE_FAN3,
    LED_TYPE_FAN4,
    LED_TYPE_FAN5,
};

static const u8 led_reg[] = {
    0x30,        /* system & reserved*/
    0x31,        /* fan & PSU1 & PSU2 */
	0x32,		 /* FAN5 LED */
	0x33,		 /* FAN1-4 LED */
};


enum led_light_mode {
    LED_MODE_OFF = 0,
    LED_MODE_GREEN,
    LED_MODE_AMBER,
    LED_MODE_RED,
    LED_MODE_GREEN_BLINK,
    LED_MODE_AMBER_BLINK,
    LED_MODE_RED_BLINK,
    LED_MODE_GREEN_FLASHING,
    LED_MODE_AMBER_FLASHING,
    LED_MODE_RED_FLASHING,
    LED_MODE_AUTO,
    LED_MODE_UNKNOWN
};

struct led_type_mode {
    enum led_type type;
    int  type_mask;
    enum led_light_mode mode;
    int  mode_mask;
};

static struct led_type_mode led_type_mode_data[] = {
{LED_TYPE_PSU1, LED_TYPE_PSU1_REG_MASK, LED_MODE_GREEN, LED_MODE_PSU1_GREEN_MASK},
{LED_TYPE_PSU1, LED_TYPE_PSU1_REG_MASK, LED_MODE_AMBER, LED_MODE_PSU1_AMBER_MASK},
{LED_TYPE_PSU1, LED_TYPE_PSU1_REG_MASK, LED_MODE_RED,   LED_MODE_PSU1_RED_MASK},
{LED_TYPE_PSU1, LED_TYPE_PSU1_REG_MASK, LED_MODE_OFF,	LED_MODE_PSU1_OFF_MASK},

{LED_TYPE_PSU2, LED_TYPE_PSU2_REG_MASK, LED_MODE_GREEN, LED_MODE_PSU2_GREEN_MASK},
{LED_TYPE_PSU2, LED_TYPE_PSU2_REG_MASK, LED_MODE_AMBER, LED_MODE_PSU2_AMBER_MASK},
{LED_TYPE_PSU2, LED_TYPE_PSU2_REG_MASK, LED_MODE_RED,  LED_MODE_PSU2_RED_MASK},
{LED_TYPE_PSU2, LED_TYPE_PSU2_REG_MASK, LED_MODE_OFF,	LED_MODE_PSU2_OFF_MASK},

{LED_TYPE_SYS,  LED_TYPE_SYS_REG_MASK,  LED_MODE_GREEN, LED_MODE_SYS_GREEN_MASK},
{LED_TYPE_SYS,  LED_TYPE_SYS_REG_MASK,  LED_MODE_AMBER, LED_MODE_SYS_AMBER_MASK},
{LED_TYPE_SYS,  LED_TYPE_SYS_REG_MASK,  LED_MODE_RED,   LED_MODE_SYS_RED_MASK},
{LED_TYPE_SYS,  LED_TYPE_SYS_REG_MASK,  LED_MODE_AMBER_FLASHING,   LED_MODE_SYS_AMBER_FLASHING_MASK},
{LED_TYPE_SYS,	LED_TYPE_SYS_REG_MASK,	LED_MODE_OFF,	LED_MODE_SYS_OFF_MASK},

{LED_TYPE_FAN,  LED_TYPE_FAN_REG_MASK,  LED_MODE_GREEN, LED_MODE_FAN_GREEN_MASK},
{LED_TYPE_FAN,  LED_TYPE_FAN_REG_MASK,  LED_MODE_AMBER, LED_MODE_FAN_AMBER_MASK},
{LED_TYPE_FAN,  LED_TYPE_FAN_REG_MASK,  LED_MODE_RED,   LED_MODE_FAN_RED_MASK},
{LED_TYPE_FAN,  LED_TYPE_FAN_REG_MASK,  LED_MODE_OFF,   LED_MODE_FAN_OFF_MASK},

{LED_TYPE_FAN1,  LED_TYPE_FAN1_REG_MASK,  LED_MODE_GREEN, LED_MODE_FANX_GREEN_MASK << 0},
{LED_TYPE_FAN1,  LED_TYPE_FAN1_REG_MASK,  LED_MODE_RED,   LED_MODE_FANX_RED_MASK << 0},
{LED_TYPE_FAN1,  LED_TYPE_FAN1_REG_MASK,  LED_MODE_AMBER, LED_MODE_FANX_AMBER_MASK << 0},
{LED_TYPE_FAN1,  LED_TYPE_FAN1_REG_MASK,  LED_MODE_OFF,   LED_MODE_FANX_OFF_MASK   << 0},
{LED_TYPE_FAN2,  LED_TYPE_FAN2_REG_MASK,  LED_MODE_GREEN, LED_MODE_FANX_GREEN_MASK << 2},
{LED_TYPE_FAN2,  LED_TYPE_FAN2_REG_MASK,  LED_MODE_RED,   LED_MODE_FANX_RED_MASK << 2},
{LED_TYPE_FAN2,  LED_TYPE_FAN2_REG_MASK,  LED_MODE_AMBER, LED_MODE_FANX_AMBER_MASK << 2},
{LED_TYPE_FAN2,  LED_TYPE_FAN2_REG_MASK,  LED_MODE_OFF,   LED_MODE_FANX_OFF_MASK   << 2},
{LED_TYPE_FAN3,  LED_TYPE_FAN3_REG_MASK,  LED_MODE_GREEN, LED_MODE_FANX_GREEN_MASK << 4},
{LED_TYPE_FAN3,  LED_TYPE_FAN3_REG_MASK,  LED_MODE_RED,   LED_MODE_FANX_RED_MASK << 4},
{LED_TYPE_FAN3,  LED_TYPE_FAN3_REG_MASK,  LED_MODE_AMBER, LED_MODE_FANX_AMBER_MASK << 4},
{LED_TYPE_FAN3,  LED_TYPE_FAN3_REG_MASK,  LED_MODE_OFF,   LED_MODE_FANX_OFF_MASK   << 4},
{LED_TYPE_FAN4,  LED_TYPE_FAN4_REG_MASK,  LED_MODE_GREEN, LED_MODE_FANX_GREEN_MASK << 6},
{LED_TYPE_FAN4,  LED_TYPE_FAN4_REG_MASK,  LED_MODE_RED,   LED_MODE_FANX_RED_MASK << 6},
{LED_TYPE_FAN4,  LED_TYPE_FAN4_REG_MASK,  LED_MODE_AMBER, LED_MODE_FANX_AMBER_MASK << 6},
{LED_TYPE_FAN4,  LED_TYPE_FAN4_REG_MASK,  LED_MODE_OFF,   LED_MODE_FANX_OFF_MASK   << 6},
{LED_TYPE_FAN5,  LED_TYPE_FAN5_REG_MASK,  LED_MODE_GREEN, LED_MODE_FANX_GREEN_MASK << 0},
{LED_TYPE_FAN5,  LED_TYPE_FAN5_REG_MASK,  LED_MODE_RED,   LED_MODE_FANX_RED_MASK << 0},
{LED_TYPE_FAN5,  LED_TYPE_FAN5_REG_MASK,  LED_MODE_AMBER, LED_MODE_FANX_AMBER_MASK << 0},
{LED_TYPE_FAN5,  LED_TYPE_FAN5_REG_MASK,  LED_MODE_OFF,   LED_MODE_FANX_OFF_MASK   << 0},
};

struct fanx_info_s {
    u8 cname; /* device name */
    enum led_type type;
    u8   reg_id; /* map to led_reg & reg_val */
};

static struct fanx_info_s fanx_info[] = {
    {'1', LED_TYPE_FAN1, 3},
    {'2', LED_TYPE_FAN2, 3},
    {'3', LED_TYPE_FAN3, 3},
    {'4', LED_TYPE_FAN4, 3},
    {'5', LED_TYPE_FAN5, 2},
};
	

static int led_reg_val_to_light_mode(enum led_type type, u8 reg_val) {
    int i;
    
    for (i = 0; i < ARRAY_SIZE(led_type_mode_data); i++) {

        if (type != led_type_mode_data[i].type)
            continue;
           
        if ((led_type_mode_data[i].type_mask & reg_val) == 
             led_type_mode_data[i].mode_mask)
        {
            return led_type_mode_data[i].mode;
        }
    }
    
    return 0;
}

static u8 led_light_mode_to_reg_val(enum led_type type, 
                                    enum led_light_mode mode, u8 reg_val) {
    int i;
                                      
    for (i = 0; i < ARRAY_SIZE(led_type_mode_data); i++) {
        if (type != led_type_mode_data[i].type)
            continue;

        if (mode != led_type_mode_data[i].mode)
            continue;

        reg_val = led_type_mode_data[i].mode_mask | 
                     (reg_val & (~led_type_mode_data[i].type_mask));
        break;
    }
    
    return reg_val;
}
									
static void cs6436_56p_led_update(void)
{
    mutex_lock(&ledctl->update_lock);

    if (time_after(jiffies, ledctl->last_updated + HZ + HZ / 2)
            || !ledctl->valid) {
        int i;

        dev_dbg(&ledctl->pdev->dev, "Starting cs6436_56p_led update\n");

        /* Update LED data
         */
        for (i = 0; i < ARRAY_SIZE(ledctl->reg_val); i++) {
            u8 status;
			cig_cpld_read_register(led_reg[i], &status);

            if (status < 0) {
                ledctl->valid = 0;
                dev_dbg(&ledctl->pdev->dev, "reg %d, err %d\n", led_reg[i], status);
                goto exit;
            }
            else
            {
                ledctl->reg_val[i] = status;
            }
        }

        ledctl->last_updated = jiffies;
        ledctl->valid = 1;
    }

exit:
    mutex_unlock(&ledctl->update_lock);
}

static void cs6436_56p_led_set(struct led_classdev *led_cdev,
                                      enum led_brightness led_light_mode,
                                      u8 reg, enum led_type type)
{
    u8 reg_val;
    mutex_lock(&ledctl->update_lock);

    cig_cpld_read_register(reg, &reg_val);
    if (reg_val < 0) {
        dev_dbg(&ledctl->pdev->dev, "reg %d, err %d\n", reg, reg_val);
        goto exit;
    }
	
    reg_val = led_light_mode_to_reg_val(type, led_light_mode, reg_val);
	
    cig_cpld_write_register(reg, reg_val);

    /* to prevent the slow-update issue */
    ledctl->valid = 0;

exit:
    mutex_unlock(&ledctl->update_lock);
}
									  
static void cs6436_56p_led_fanx_set(struct led_classdev *led_cdev,
									enum led_brightness led_light_mode)
{
	enum led_type led_type1;
	int reg_id;
	int i, nsize;
	int ncount = sizeof(fanx_info)/sizeof(struct fanx_info_s);

	for(i=0;i<ncount;i++)
	{
		nsize=strlen(led_cdev->name);

		if (led_cdev->name[nsize-1] == fanx_info[i].cname)
		{
			led_type1 = fanx_info[i].type;
			reg_id = fanx_info[i].reg_id;

			cs6436_56p_led_set(led_cdev, led_light_mode, led_reg[reg_id], led_type1);
			return;
		}
	}
}


static enum led_brightness cs6436_56p_led_fanx_get(struct led_classdev *cdev)
{
	enum led_type led_type1;
	int reg_id;
	int i, nsize;
	int ncount = sizeof(fanx_info)/sizeof(struct fanx_info_s);

	for(i=0;i<ncount;i++)
	{
		nsize=strlen(cdev->name);

		if (cdev->name[nsize-1] == fanx_info[i].cname)
		{
			led_type1 = fanx_info[i].type;
			reg_id = fanx_info[i].reg_id;
			cs6436_56p_led_update();
			return led_reg_val_to_light_mode(led_type1, ledctl->reg_val[reg_id]);
		}
  	}
  
	return led_reg_val_to_light_mode(LED_TYPE_FAN1, ledctl->reg_val[5]);
}

									  
static void cs6436_56p_led_psu1_set(struct led_classdev *led_cdev,
	  enum led_brightness led_light_mode)
{
  cs6436_56p_led_set(led_cdev, led_light_mode, led_reg[1], LED_TYPE_PSU1);
}

static enum led_brightness cs6436_56p_led_psu1_get(struct led_classdev *cdev)
{
  cs6436_56p_led_update();
  return led_reg_val_to_light_mode(LED_TYPE_PSU1, ledctl->reg_val[1]);
}

static void cs6436_56p_led_psu2_set(struct led_classdev *led_cdev,
	  enum led_brightness led_light_mode)
{
  cs6436_56p_led_set(led_cdev, led_light_mode, led_reg[1], LED_TYPE_PSU2);
}

static enum led_brightness cs6436_56p_led_psu2_get(struct led_classdev *cdev)
{
  cs6436_56p_led_update();
  return led_reg_val_to_light_mode(LED_TYPE_PSU2, ledctl->reg_val[1]);
}

static void cs6436_56p_led_sys_set(struct led_classdev *led_cdev,
        enum led_brightness led_light_mode)
{
    cs6436_56p_led_set(led_cdev, led_light_mode,led_reg[0], LED_TYPE_SYS);
}

static enum led_brightness cs6436_56p_led_sys_get(struct led_classdev *cdev)
{
    cs6436_56p_led_update();
    return led_reg_val_to_light_mode(LED_TYPE_SYS, ledctl->reg_val[0]);
}


static enum led_brightness cs6436_56p_led_fan_get(struct led_classdev *cdev)
{
    cs6436_56p_led_update();
    return led_reg_val_to_light_mode(LED_TYPE_FAN, ledctl->reg_val[1]);
}

static void cs6436_56p_led_fan_set(struct led_classdev *led_cdev,
        enum led_brightness led_light_mode)
{
    cs6436_56p_led_set(led_cdev, led_light_mode, led_reg[1], LED_TYPE_FAN);
}


static struct led_classdev cs6436_56p_leds[] = {
    [LED_TYPE_SYS] = {
        .name			 = "cs6436_56p_led::sys",
        .default_trigger = "unused",
        .brightness_set	 = cs6436_56p_led_sys_set,
        .brightness_get	 = cs6436_56p_led_sys_get,
        .flags			 = LED_CORE_SUSPENDRESUME,
        .max_brightness	 = LED_MODE_AUTO,
    },
    [LED_TYPE_FAN] = {
        .name			 = "cs6436_56p_led::fan",
        .default_trigger = "unused",
        .brightness_set	 = cs6436_56p_led_fan_set,
        .brightness_get  = cs6436_56p_led_fan_get,
        .flags			 = LED_CORE_SUSPENDRESUME,
        .max_brightness  = LED_MODE_AUTO,
    },
	
    [LED_TYPE_PSU1] = {
        .name			 = "cs6436_56p_led::psu1",
        .default_trigger = "unused",
        .brightness_set	 = cs6436_56p_led_psu1_set,
        .brightness_get  = cs6436_56p_led_psu1_get,
        .flags			 = LED_CORE_SUSPENDRESUME,
        .max_brightness  = LED_MODE_AUTO,
    },
    [LED_TYPE_PSU2] = {
        .name			 = "cs6436_56p_led::psu2",
        .default_trigger = "unused",
        .brightness_set	 = cs6436_56p_led_psu2_set,
        .brightness_get  = cs6436_56p_led_psu2_get,
        .flags			 = LED_CORE_SUSPENDRESUME,
        .max_brightness  = LED_MODE_AUTO,
    },
	   
	[LED_TYPE_FAN1] = {
		.name			  = "cs6436_56p_led::fan1",
		.default_trigger = "unused",
		.brightness_set 	= cs6436_56p_led_fanx_set,
		.brightness_get  = cs6436_56p_led_fanx_get,
		.flags			   = LED_CORE_SUSPENDRESUME,
		.max_brightness  = LED_MODE_AUTO,
	},
	[LED_TYPE_FAN2] = {
		.name			  = "cs6436_56p_led::fan2",
		.default_trigger = "unused",
		.brightness_set 	= cs6436_56p_led_fanx_set,
		.brightness_get  = cs6436_56p_led_fanx_get,
		.flags			   = LED_CORE_SUSPENDRESUME,
		.max_brightness  = LED_MODE_AUTO,
	},
	[LED_TYPE_FAN3] = {
		.name			  = "cs6436_56p_led::fan3",
		.default_trigger = "unused",
		.brightness_set 	= cs6436_56p_led_fanx_set,
		.brightness_get  = cs6436_56p_led_fanx_get,
		.flags			   = LED_CORE_SUSPENDRESUME,
		.max_brightness  = LED_MODE_AUTO,
	},
	[LED_TYPE_FAN4] = {
		.name			  = "cs6436_56p_led::fan4",
		.default_trigger = "unused",
		.brightness_set 	= cs6436_56p_led_fanx_set,
		.brightness_get  = cs6436_56p_led_fanx_get,
		.flags			   = LED_CORE_SUSPENDRESUME,
		.max_brightness  = LED_MODE_AUTO,
	},
	[LED_TYPE_FAN5] = {
		.name			  = "cs6436_56p_led::fan5",
		.default_trigger = "unused",
		.brightness_set 	= cs6436_56p_led_fanx_set,
		.brightness_get  = cs6436_56p_led_fanx_get,
		.flags			   = LED_CORE_SUSPENDRESUME,
		.max_brightness  = LED_MODE_AUTO,
	}
};

static int cs6436_56p_led_suspend(struct platform_device *dev,
        pm_message_t state)
{
    int i = 0;

    for (i = 0; i < ARRAY_SIZE(cs6436_56p_leds); i++) {
        led_classdev_suspend(&cs6436_56p_leds[i]);
    }

    return 0;
}

static int cs6436_56p_led_resume(struct platform_device *dev)
{
    int i = 0;

    for (i = 0; i < ARRAY_SIZE(cs6436_56p_leds); i++) {
        led_classdev_resume(&cs6436_56p_leds[i]);
    }

    return 0;
}

static int cs6436_56p_led_probe(struct platform_device *pdev)
{
    int ret, i;

    for (i = 0; i < ARRAY_SIZE(cs6436_56p_leds); i++) {
        ret = led_classdev_register(&pdev->dev, &cs6436_56p_leds[i]);

        if (ret < 0)
            break;
    }

    /* Check if all LEDs were successfully registered */
    if (i != ARRAY_SIZE(cs6436_56p_leds)) {
        int j;

        /* only unregister the LEDs that were successfully registered */
        for (j = 0; j < i; j++) {
            led_classdev_unregister(&cs6436_56p_leds[i]);
        }
    }

    return ret;
}

static int cs6436_56p_led_remove(struct platform_device *pdev)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(cs6436_56p_leds); i++) {
        led_classdev_unregister(&cs6436_56p_leds[i]);
    }

    return 0;
}

static struct platform_driver cs6436_56p_led_driver = {
    .probe	  = cs6436_56p_led_probe,
    .remove	 = cs6436_56p_led_remove,
    .suspend	= cs6436_56p_led_suspend,
    .resume	 = cs6436_56p_led_resume,
    .driver	 = {
        .name   = DRVNAME,
        .owner  = THIS_MODULE,
    },
};

static int cs6436_56p_led_default(void)
{
	cig_cpld_write_register(0x30, 0x40);// system green led solid on
}

static int __init cs6436_56p_led_init(void)
{
    int ret;

    ret = platform_driver_register(&cs6436_56p_led_driver);
    if (ret < 0) {
        goto exit;
    }

    ledctl = kzalloc(sizeof(struct cs6436_56p_led_data), GFP_KERNEL);
    if (!ledctl) {
        ret = -ENOMEM;
        platform_driver_unregister(&cs6436_56p_led_driver);
        goto exit;
    }

    mutex_init(&ledctl->update_lock);

    ledctl->pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
    if (IS_ERR(ledctl->pdev)) {
        ret = PTR_ERR(ledctl->pdev);
        platform_driver_unregister(&cs6436_56p_led_driver);
        kfree(ledctl);
        goto exit;
    }
	
	cs6436_56p_led_default();

exit:
    return ret;
}

static void __exit cs6436_56p_led_exit(void)
{
    platform_device_unregister(ledctl->pdev);
    platform_driver_unregister(&cs6436_56p_led_driver);
    kfree(ledctl);
}

module_init(cs6436_56p_led_init);
module_exit(cs6436_56p_led_exit);

MODULE_AUTHOR("Zhang Peng <zhangpeng@cigtech.com>");
MODULE_DESCRIPTION("cs6436_56p_led driver");
MODULE_LICENSE("GPL");