linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * An hwmon driver for the Analog Devices AD7416/17/18

 * Copyright (C) 2006-07 Tower Technologies

 *

 * Author: Alessandro Zummo <a.zummo@towertech.it>

 *

 * Based on lm75.c

 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>

 */

​

#include <linux/module.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>

#include <linux/of_device.h>

#include <linux/delay.h>

#include <linux/slab.h>

​

#include "lm75.h"

​

#define DRV_VERSION "0.4"

​

enum chips { ad7416, ad7417, ad7418 };

​

/* AD7418 registers */

#define AD7418_REG_TEMP_IN  0x00

#define AD7418_REG_CONF     0x01

#define AD7418_REG_TEMP_HYST    0x02

#define AD7418_REG_TEMP_OS  0x03

#define AD7418_REG_ADC      0x04

#define AD7418_REG_CONF2    0x05

​

#define AD7418_REG_ADC_CH(x)    ((x) << 5)

#define AD7418_CH_TEMP      AD7418_REG_ADC_CH(0)

​

static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,

                    AD7418_REG_TEMP_HYST,

                    AD7418_REG_TEMP_OS };

​

struct ad7418_data {

    struct i2c_client   *client;

    enum chips      type;

    struct mutex        lock;

    int         adc_max;    /* number of ADC channels */

    char            valid;

    unsigned long       last_updated;   /* In jiffies */

    s16         temp[3];    /* Register values */

    u16         in[4];

};

​

static int ad7418_update_device(struct device *dev)

{

    struct ad7418_data *data = dev_get_drvdata(dev);

    struct i2c_client *client = data->client;

    s32 val;

​

    mutex_lock(&data->lock);

​

    if (time_after(jiffies, data->last_updated + HZ + HZ / 2)

        || !data->valid) {

        u8 cfg;

        int i, ch;

​

        /* read config register and clear channel bits */

        val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);

        if (val < 0)

            goto abort;

​

        cfg = val;

        cfg &= 0x1F;

​

        val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF,

                        cfg | AD7418_CH_TEMP);

        if (val < 0)

            goto abort;

​

        udelay(30);

​

        for (i = 0; i < 3; i++) {

            val = i2c_smbus_read_word_swapped(client,

                              AD7418_REG_TEMP[i]);

            if (val < 0)

                goto abort;

​

            data->temp[i] = val;

        }

​

        for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {