linux-imx

/*

 * Driver for Linear Technology LTC4151 High Voltage I2C Current

 * and Voltage Monitor

 *

 * Copyright (C) 2011 AppearTV AS

 *

 * Derived from:

 *

 *  Driver for Linear Technology LTC4261 I2C Negative Voltage Hot

 *  Swap Controller

 *  Copyright (C) 2010 Ericsson AB.

 *

 * Datasheet: http://www.linear.com/docs/Datasheet/4151fc.pdf

 *

 * 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.

 *

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/jiffies.h>

​

/* chip registers */

#define LTC4151_SENSE_H 0x00

#define LTC4151_SENSE_L 0x01

#define LTC4151_VIN_H   0x02

#define LTC4151_VIN_L   0x03

#define LTC4151_ADIN_H  0x04

#define LTC4151_ADIN_L  0x05

​

struct ltc4151_data {

    struct i2c_client *client;

​

    struct mutex update_lock;

    bool valid;

    unsigned long last_updated; /* in jiffies */

    unsigned int shunt; /* in micro ohms */

​

    /* Registers */

    u8 regs[6];

};

​

static struct ltc4151_data *ltc4151_update_device(struct device *dev)

{