linux-imx

/*

 * Support for the FTS Systemmonitoring Chip "Teutates"

 *

 * Copyright (C) 2016 Fujitsu Technology Solutions GmbH,

 *        Thilo Cestonaro <thilo.cestonaro@ts.fujitsu.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.

 *

 */

#include <linux/err.h>

#include <linux/fs.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/uaccess.h>

#include <linux/watchdog.h>

​

#define FTS_DEVICE_ID_REG       0x0000

#define FTS_DEVICE_REVISION_REG     0x0001

#define FTS_DEVICE_STATUS_REG       0x0004

#define FTS_SATELLITE_STATUS_REG    0x0005

#define FTS_EVENT_STATUS_REG        0x0006

#define FTS_GLOBAL_CONTROL_REG      0x0007

​

#define FTS_DEVICE_DETECT_REG_1     0x0C

#define FTS_DEVICE_DETECT_REG_2     0x0D

#define FTS_DEVICE_DETECT_REG_3     0x0E

​

#define FTS_SENSOR_EVENT_REG        0x0010

​

#define FTS_FAN_EVENT_REG       0x0014

#define FTS_FAN_PRESENT_REG     0x0015

​

#define FTS_POWER_ON_TIME_COUNTER_A 0x007A

#define FTS_POWER_ON_TIME_COUNTER_B 0x007B

#define FTS_POWER_ON_TIME_COUNTER_C 0x007C

​

#define FTS_PAGE_SELECT_REG     0x007F

​

#define FTS_WATCHDOG_TIME_PRESET    0x000B

#define FTS_WATCHDOG_CONTROL        0x5081

​

#define FTS_NO_FAN_SENSORS      0x08

#define FTS_NO_TEMP_SENSORS     0x10

#define FTS_NO_VOLT_SENSORS     0x04

​

static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

​

static const struct i2c_device_id fts_id[] = {

    { "ftsteutates", 0 },

    { }

};

MODULE_DEVICE_TABLE(i2c, fts_id);

​

enum WATCHDOG_RESOLUTION {

    seconds = 1,

    minutes = 60

};

​

struct fts_data {

    struct i2c_client *client;

    /* update sensor data lock */

    struct mutex update_lock;

    /* read/write register lock */

    struct mutex access_lock;

    unsigned long last_updated; /* in jiffies */

    struct watchdog_device wdd;

    enum WATCHDOG_RESOLUTION resolution;

    bool valid; /* false until following fields are valid */

​

    u8 volt[FTS_NO_VOLT_SENSORS];

​

    u8 temp_input[FTS_NO_TEMP_SENSORS];

    u8 temp_alarm;

​

    u8 fan_present;

    u8 fan_input[FTS_NO_FAN_SENSORS]; /* in rps */

    u8 fan_source[FTS_NO_FAN_SENSORS];