linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * asc7621.c - Part of lm_sensors, Linux kernel modules for hardware monitoring

 * Copyright (c) 2007, 2010 George Joseph  <george.joseph@fairview5.com>

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/jiffies.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

​

/* Addresses to scan */

static const unsigned short normal_i2c[] = {

    0x2c, 0x2d, 0x2e, I2C_CLIENT_END

};

​

enum asc7621_type {

    asc7621,

    asc7621a

};

​

#define INTERVAL_HIGH   (HZ + HZ / 2)

#define INTERVAL_LOW    (1 * 60 * HZ)

#define PRI_NONE        0

#define PRI_LOW         1

#define PRI_HIGH        2

#define FIRST_CHIP      asc7621

#define LAST_CHIP       asc7621a

​

struct asc7621_chip {

    char *name;

    enum asc7621_type chip_type;

    u8 company_reg;

    u8 company_id;

    u8 verstep_reg;

    u8 verstep_id;

    const unsigned short *addresses;

};

​

static struct asc7621_chip asc7621_chips[] = {

    {

        .name = "asc7621",

        .chip_type = asc7621,

        .company_reg = 0x3e,

        .company_id = 0x61,

        .verstep_reg = 0x3f,

        .verstep_id = 0x6c,

        .addresses = normal_i2c,

     },

    {

        .name = "asc7621a",

        .chip_type = asc7621a,

        .company_reg = 0x3e,

        .company_id = 0x61,

        .verstep_reg = 0x3f,

        .verstep_id = 0x6d,

        .addresses = normal_i2c,

     },

};

​

/*

 * Defines the highest register to be used, not the count.

 * The actual count will probably be smaller because of gaps

 * in the implementation (unused register locations).

 * This define will safely set the array size of both the parameter

 * and data arrays.

 * This comes from the data sheet register description table.

 */

#define LAST_REGISTER 0xff

​

struct asc7621_data {

    struct i2c_client client;

    struct device *class_dev;

    struct mutex update_lock;

    int valid;      /* !=0 if following fields are valid */

    unsigned long last_high_reading;    /* In jiffies */

    unsigned long last_low_reading;     /* In jiffies */

    /*

     * Registers we care about occupy the corresponding index

     * in the array.  Registers we don't care about are left

     * at 0.

     */

    u8 reg[LAST_REGISTER + 1];

};

​

/*

 * Macro to get the parent asc7621_param structure