linux-imx

/*

 * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware

 *   monitoring

 * This driver handles the ADT7410 and compatible digital temperature sensors.

 * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22

 * based on lm75.c by Frodo Looijaard <frodol@dds.nl>

 * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>

 *

 * 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/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/jiffies.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

​

#include "adt7x10.h"

​

/*

 * ADT7X10 status

 */

#define ADT7X10_STAT_T_LOW      (1 << 4)

#define ADT7X10_STAT_T_HIGH     (1 << 5)

#define ADT7X10_STAT_T_CRIT     (1 << 6)

#define ADT7X10_STAT_NOT_RDY        (1 << 7)

​

/*

 * ADT7X10 config

 */

#define ADT7X10_FAULT_QUEUE_MASK    (1 << 0 | 1 << 1)

#define ADT7X10_CT_POLARITY     (1 << 2)

#define ADT7X10_INT_POLARITY        (1 << 3)

#define ADT7X10_EVENT_MODE      (1 << 4)

#define ADT7X10_MODE_MASK       (1 << 5 | 1 << 6)

#define ADT7X10_FULL            (0 << 5 | 0 << 6)

#define ADT7X10_PD          (1 << 5 | 1 << 6)

#define ADT7X10_RESOLUTION      (1 << 7)

​

/*

 * ADT7X10 masks

 */

#define ADT7X10_T13_VALUE_MASK      0xFFF8

#define ADT7X10_T_HYST_MASK     0xF

​

/* straight from the datasheet */

#define ADT7X10_TEMP_MIN (-55000)

#define ADT7X10_TEMP_MAX 150000

​

/* Each client has this additional data */

struct adt7x10_data {

    const struct adt7x10_ops *ops;

    const char      *name;

    struct device       *hwmon_dev;

    struct mutex        update_lock;

    u8          config;

    u8          oldconfig;

    bool            valid;      /* true if registers valid */

    unsigned long       last_updated;   /* In jiffies */

    s16         temp[4];    /* Register values,

                           0 = input

                           1 = high

                           2 = low

                           3 = critical */

    u8          hyst;       /* hysteresis offset */

};

​

static int adt7x10_read_byte(struct device *dev, u8 reg)

{

    struct adt7x10_data *d = dev_get_drvdata(dev);

    return d->ops->read_byte(dev, reg);

}

​

static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)

{