// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware
 *              monitoring
 *
 * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
 *                      Philip Edelbrock <phil@netroedge.com>
 * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
 * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable
 *                              guidance from Jean Delvare
 *
 * Driver supports      Analog Devices          ADM9240
 *                      Dallas Semiconductor    DS1780
 *                      National Semiconductor  LM81
 *
 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
 *
 * Voltage      Six inputs are scaled by chip, VID also reported
 * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris
 * Fans         2 fans, low speed alarm, automatic fan clock divider
 * Alarms       16-bit map of active alarms
 * Analog Out   0..1250 mV output
 *
 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
 *
 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
 *
 * LM81 extended temp reading not implemented
 */

#include <linux/bits.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/regmap.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
                                        I2C_CLIENT_END };

enum chips { adm9240, ds1780, lm81 };

/* ADM9240 registers */
#define ADM9240_REG_MAN_ID              0x3e
#define ADM9240_REG_DIE_REV             0x3f
#define ADM9240_REG_CONFIG              0x40

#define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
#define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
#define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
#define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
#define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
#define ADM9240_REG_INT(nr)             (0x41 + (nr))
#define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
#define ADM9240_REG_TEMP                0x27
#define ADM9240_REG_TEMP_MAX(nr)        (0x39 + (nr)) /* 0, 1 = high, hyst */
#define ADM9240_REG_ANALOG_OUT          0x19
#define ADM9240_REG_CHASSIS_CLEAR       0x46
#define ADM9240_REG_VID_FAN_DIV         0x47
#define ADM9240_REG_I2C_ADDR            0x48
#define ADM9240_REG_VID4                0x49
#define ADM9240_REG_TEMP_CONF           0x4b

/* generalised scaling with integer rounding */
static inline int SCALE(long val, int mul, int div)
{
        if (val < 0)
                return (val * mul - div / 2) / div;
        else
                return (val * mul + div / 2) / div;
}

/* adm9240 internally scales voltage measurements */
static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };

static inline unsigned int IN_FROM_REG(u8 reg, int n)
{
        return SCALE(reg, nom_mv[n], 192);
}

static inline u8 IN_TO_REG(unsigned long val, int n)
{
        val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
        return SCALE(val, 192, nom_mv[n]);
}

/* temperature range: -40..125, 127 disables temperature alarm */
static inline s8 TEMP_TO_REG(long val)
{
        val = clamp_val(val, -40000, 127000);
        return SCALE(val, 1, 1000);
}

/* two fans, each with low fan speed limit */
static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
{
        if (!reg) /* error */
                return -1;

        if (reg == 255)
                return 0;

        return SCALE(1350000, 1, reg * div);
}

/* analog out 0..1250mV */
static inline u8 AOUT_TO_REG(unsigned long val)
{
        val = clamp_val(val, 0, 1250);
        return SCALE(val, 255, 1250);
}

static inline unsigned int AOUT_FROM_REG(u8 reg)
{
        return SCALE(reg, 1250, 255);
}

/* per client data */
struct adm9240_data {
        struct device *dev;
        struct regmap *regmap;

        u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
        u8 vrm;                 /* --   vrm set on startup, no accessor */
};

/* write new fan div, callers must hold data->update_lock */
static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
{
        unsigned int reg, old, shift = (channel + 2) * 2;
        int err;

        err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &reg);
        if (err < 0)
                return err;
        old = (reg >> shift) & 3;
        reg &= ~(3 << shift);
        reg |= (fan_div << shift);
        err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
        if (err < 0)
                return err;
        dev_dbg(data->dev,
                "fan%d clock divider changed from %lu to %lu\n",
                channel + 1, BIT(old), BIT(fan_div));

        return 0;
}

/*
 * set fan speed low limit:
 *
 * - value is zero: disable fan speed low limit alarm
 *
 * - value is below fan speed measurement range: enable fan speed low
 *   limit alarm to be asserted while fan speed too slow to measure
 *
 * - otherwise: select fan clock divider to suit fan speed low limit,
 *   measurement code may adjust registers to ensure fan speed reading
 */
static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
{
        u8 new_div;
        u8 fan_min;
        int err;

        if (!val) {
                fan_min = 255;
                new_div = data->fan_div[channel];

                dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
        } else if (val < 1350000 / (8 * 254)) {
                new_div = 3;
                fan_min = 254;

                dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
                        channel + 1, FAN_FROM_REG(254, BIT(new_div)));
        } else {
                unsigned int new_min = 1350000 / val;

                new_div = 0;
                while (new_min > 192 && new_div < 3) {
                        new_div++;
                        new_min /= 2;
                }
                if (!new_min) /* keep > 0 */
                        new_min++;

                fan_min = new_min;

                dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
                        channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
        }

        if (new_div != data->fan_div[channel]) {
                data->fan_div[channel] = new_div;
                adm9240_write_fan_div(data, channel, new_div);
        }
        err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);

        return err;
}

static ssize_t cpu0_vid_show(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err;
        u8 vid;

        err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
        if (err < 0)
                return err;
        vid = regval & 0x0f;
        err = regmap_read(data->regmap, ADM9240_REG_VID4, &regval);
        if (err < 0)
                return err;
        vid |= (regval & 1) << 4;
        return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
}
static DEVICE_ATTR_RO(cpu0_vid);

static ssize_t aout_output_show(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err;

        err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, &regval);
        if (err)
                return err;

        return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
}

static ssize_t aout_output_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        long val;
        int err;

        err = kstrtol(buf, 10, &val);
        if (err)
                return err;

        err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
        return err < 0 ? err : count;
}
static DEVICE_ATTR_RW(aout_output);

static struct attribute *adm9240_attrs[] = {
        &dev_attr_aout_output.attr,
        &dev_attr_cpu0_vid.attr,
        NULL
};

ATTRIBUTE_GROUPS(adm9240);

/*** sensor chip detect and driver install ***/

/* Return 0 if detection is successful, -ENODEV otherwise */
static int adm9240_detect(struct i2c_client *new_client,
                          struct i2c_board_info *info)
{
        struct i2c_adapter *adapter = new_client->adapter;
        const char *name = "";
        int address = new_client->addr;
        u8 man_id, die_rev;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                return -ENODEV;

        /* verify chip: reg address should match i2c address */
        if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
                return -ENODEV;

        /* check known chip manufacturer */
        man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
        if (man_id == 0x23)
                name = "adm9240";
        else if (man_id == 0xda)
                name = "ds1780";
        else if (man_id == 0x01)
                name = "lm81";
        else
                return -ENODEV;

        /* successful detect, print chip info */
        die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
        dev_info(&adapter->dev, "found %s revision %u\n",
                 man_id == 0x23 ? "ADM9240" :
                 man_id == 0xda ? "DS1780" : "LM81", die_rev);

        strscpy(info->type, name, I2C_NAME_SIZE);

        return 0;
}

static int adm9240_init_client(struct adm9240_data *data)
{
        unsigned int regval;
        u8 conf, mode;
        int err;

        err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
        if (err < 0)
                return err;
        err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
        if (err < 0)
                return err;
        mode &= 3;

        data->vrm = vid_which_vrm(); /* need this to report vid as mV */

        dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
                 data->vrm % 10);

        if (conf & 1) { /* measurement cycle running: report state */

                dev_info(data->dev, "status: config 0x%02x mode %u\n",
                         conf, mode);

        } else { /* cold start: open limits before starting chip */
                int i;

                for (i = 0; i < 6; i++) {
                        err = regmap_write(data->regmap,
                                           ADM9240_REG_IN_MIN(i), 0);
                        if (err < 0)
                                return err;
                        err = regmap_write(data->regmap,
                                           ADM9240_REG_IN_MAX(i), 255);
                        if (err < 0)
                                return err;
                }
                for (i = 0; i < 2; i++) {
                        err = regmap_write(data->regmap,
                                           ADM9240_REG_FAN_MIN(i), 255);
                        if (err < 0)
                                return err;
                }
                for (i = 0; i < 2; i++) {
                        err = regmap_write(data->regmap,
                                           ADM9240_REG_TEMP_MAX(i), 127);
                        if (err < 0)
                                return err;
                }

                /* start measurement cycle */
                err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
                if (err < 0)
                        return err;

                dev_info(data->dev,
                         "cold start: config was 0x%02x mode %u\n", conf, mode);
        }

        /* read fan divs */
        err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
        if (err < 0)
                return err;
        data->fan_div[0] = (regval >> 4) & 3;
        data->fan_div[1] = (regval >> 6) & 3;
        return 0;
}

static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        u8 regs[2];
        int err;

        switch (attr) {
        case hwmon_chip_alarms:
                err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), &regs, 2);
                if (err < 0)
                        return err;
                *val = regs[0] | regs[1] << 8;
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err;

        switch (attr) {
        case hwmon_intrusion_alarm:
                err = regmap_read(data->regmap, ADM9240_REG_INT(1), &regval);
                if (err < 0)
                        return err;
                *val = !!(regval & BIT(4));
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        int err;

        switch (attr) {
        case hwmon_intrusion_alarm:
                if (val)
                        return -EINVAL;
                err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
                if (err < 0)
                        return err;
                dev_dbg(data->dev, "chassis intrusion latch cleared\n");
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int reg;
        int err;

        switch (attr) {
        case hwmon_in_input:
                reg = ADM9240_REG_IN(channel);
                break;
        case hwmon_in_min:
                reg = ADM9240_REG_IN_MIN(channel);
                break;
        case hwmon_in_max:
                reg = ADM9240_REG_IN_MAX(channel);
                break;
        case hwmon_in_alarm:
                if (channel < 4) {
                        reg = ADM9240_REG_INT(0);
                } else {
                        reg = ADM9240_REG_INT(1);
                        channel -= 4;
                }
                err = regmap_read(data->regmap, reg, &regval);
                if (err < 0)
                        return err;
                *val = !!(regval & BIT(channel));
                return 0;
        default:
                return -EOPNOTSUPP;
        }
        err = regmap_read(data->regmap, reg, &regval);
        if (err < 0)
                return err;
        *val = IN_FROM_REG(regval, channel);
        return 0;
}

static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        int reg;

        switch (attr) {
        case hwmon_in_min:
                reg = ADM9240_REG_IN_MIN(channel);
                break;
        case hwmon_in_max:
                reg = ADM9240_REG_IN_MAX(channel);
                break;
        default:
                return -EOPNOTSUPP;
        }
        return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
}

static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err;

        switch (attr) {
        case hwmon_fan_input:
                err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), &regval);
                if (err < 0)
                        return err;
                if (regval == 255 && data->fan_div[channel] < 3) {
                        /* adjust fan clock divider on overflow */
                        err = adm9240_write_fan_div(data, channel,
                                                    ++data->fan_div[channel]);
                        if (err)
                                return err;
                }
                *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
                break;
        case hwmon_fan_div:
                *val = BIT(data->fan_div[channel]);
                break;
        case hwmon_fan_min:
                err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), &regval);
                if (err < 0)
                        return err;
                *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
                break;
        case hwmon_fan_alarm:
                err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
                if (err < 0)
                        return err;
                *val = !!(regval & BIT(channel + 6));
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        int err;

        switch (attr) {
        case hwmon_fan_min:
                err = adm9240_fan_min_write(data, channel, val);
                if (err < 0)
                        return err;
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err, temp;

        switch (attr) {
        case hwmon_temp_input:
                err = regmap_read(data->regmap, ADM9240_REG_TEMP, &regval);
                if (err < 0)
                        return err;
                temp = regval << 1;
                err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, &regval);
                if (err < 0)
                        return err;
                temp |= regval >> 7;
                *val = sign_extend32(temp, 8) * 500;
                break;
        case hwmon_temp_max:
                err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), &regval);
                if (err < 0)
                        return err;
                *val = (s8)regval * 1000;
                break;
        case hwmon_temp_max_hyst:
                err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), &regval);
                if (err < 0)
                        return err;
                *val = (s8)regval * 1000;
                break;
        case hwmon_temp_alarm:
                err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
                if (err < 0)
                        return err;
                *val = !!(regval & BIT(4));
                break;
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
{
        struct adm9240_data *data = dev_get_drvdata(dev);
        int reg;

        switch (attr) {
        case hwmon_temp_max:
                reg = ADM9240_REG_TEMP_MAX(0);
                break;
        case hwmon_temp_max_hyst:
                reg = ADM9240_REG_TEMP_MAX(1);
                break;
        default:
                return -EOPNOTSUPP;
        }
        return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
}

static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
                        int channel, long *val)
{
        switch (type) {
        case hwmon_chip:
                return adm9240_chip_read(dev, attr, val);
        case hwmon_intrusion:
                return adm9240_intrusion_read(dev, attr, val);
        case hwmon_in:
                return adm9240_in_read(dev, attr, channel, val);
        case hwmon_fan:
                return adm9240_fan_read(dev, attr, channel, val);
        case hwmon_temp:
                return adm9240_temp_read(dev, attr, channel, val);
        default:
                return -EOPNOTSUPP;
        }
}

static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
                         int channel, long val)
{
        switch (type) {
        case hwmon_intrusion:
                return adm9240_intrusion_write(dev, attr, val);
        case hwmon_in:
                return adm9240_in_write(dev, attr, channel, val);
        case hwmon_fan:
                return adm9240_fan_write(dev, attr, channel, val);
        case hwmon_temp:
                return adm9240_temp_write(dev, attr, channel, val);
        default:
                return -EOPNOTSUPP;
        }
}

static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
                                  u32 attr, int channel)
{
        umode_t mode = 0;

        switch (type) {
        case hwmon_chip:
                switch (attr) {
                case hwmon_chip_alarms:
                        mode = 0444;
                        break;
                default:
                        break;
                }
                break;
        case hwmon_intrusion:
                switch (attr) {
                case hwmon_intrusion_alarm:
                        mode = 0644;
                        break;
                default:
                        break;
                }
                break;
        case hwmon_temp:
                switch (attr) {
                case hwmon_temp:
                case hwmon_temp_alarm:
                        mode = 0444;
                        break;
                case hwmon_temp_max:
                case hwmon_temp_max_hyst:
                        mode = 0644;
                        break;
                default:
                        break;
                }
                break;
        case hwmon_fan:
                switch (attr) {
                case hwmon_fan_input:
                case hwmon_fan_div:
                case hwmon_fan_alarm:
                        mode = 0444;
                        break;
                case hwmon_fan_min:
                        mode = 0644;
                        break;
                default:
                        break;
                }
                break;
        case hwmon_in:
                switch (attr) {
                case hwmon_in_input:
                case hwmon_in_alarm:
                        mode = 0444;
                        break;
                case hwmon_in_min:
                case hwmon_in_max:
                        mode = 0644;
                        break;
                default:
                        break;
                }
                break;
        default:
                break;
        }
        return mode;
}

static const struct hwmon_ops adm9240_hwmon_ops = {
        .is_visible = adm9240_is_visible,
        .read = adm9240_read,
        .write = adm9240_write,
};

static const struct hwmon_channel_info * const adm9240_info[] = {
        HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
        HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
        HWMON_CHANNEL_INFO(temp,
                           HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
        HWMON_CHANNEL_INFO(in,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
                           HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
        HWMON_CHANNEL_INFO(fan,
                           HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
                           HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
        NULL
};

static const struct hwmon_chip_info adm9240_chip_info = {
        .ops = &adm9240_hwmon_ops,
        .info = adm9240_info,
};

static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
        case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
        case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
        case ADM9240_REG_TEMP:
        case ADM9240_REG_TEMP_CONF:
        case ADM9240_REG_VID_FAN_DIV:
        case ADM9240_REG_VID4:
        case ADM9240_REG_ANALOG_OUT:
                return true;
        default:
                return false;
        }
}

static const struct regmap_config adm9240_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .use_single_read = true,
        .use_single_write = true,
        .volatile_reg = adm9240_volatile_reg,
};

static int adm9240_probe(struct i2c_client *client)
{
        struct device *dev = &client->dev;
        struct device *hwmon_dev;
        struct adm9240_data *data;
        int err;

        data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        data->dev = dev;
        data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
        if (IS_ERR(data->regmap))
                return PTR_ERR(data->regmap);

        err = adm9240_init_client(data);
        if (err < 0)
                return err;

        hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
                                                         &adm9240_chip_info,
                                                         adm9240_groups);
        return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id adm9240_id[] = {
        { "adm9240", adm9240 },
        { "ds1780", ds1780 },
        { "lm81", lm81 },
        { }
};
MODULE_DEVICE_TABLE(i2c, adm9240_id);

static struct i2c_driver adm9240_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "adm9240",
        },
        .probe          = adm9240_probe,
        .id_table       = adm9240_id,
        .detect         = adm9240_detect,
        .address_list   = normal_i2c,
};

module_i2c_driver(adm9240_driver);

MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
                "Grant Coady <gcoady.lk@gmail.com> and others");
MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
MODULE_LICENSE("GPL");