// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * lm75.c - Part of lm_sensors, Linux kernel modules for hardware
 *       monitoring
 * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/i3c/device.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>
#include <linux/regulator/consumer.h>
#include "lm75.h"

/*
 * This driver handles the LM75 and compatible digital temperature sensors.
 */

enum lm75_type {                /* keep sorted in alphabetical order */
        adt75,
        as6200,
        at30ts74,
        ds1775,
        ds75,
        ds7505,
        g751,
        lm75,
        lm75a,
        lm75b,
        max6625,
        max6626,
        max31725,
        mcp980x,
        p3t1750,
        p3t1755,
        pct2075,
        stds75,
        stlm75,
        tcn75,
        tmp100,
        tmp101,
        tmp105,
        tmp112,
        tmp175,
        tmp275,
        tmp75,
        tmp75b,
        tmp75c,
        tmp1075,
};

/**
 * struct lm75_params - lm75 configuration parameters.
 * @config_reg_16bits:  Configure register size is 2 bytes.
 * @set_mask:           Bits to set in configuration register when configuring
 *                      the chip.
 * @clr_mask:           Bits to clear in configuration register when configuring
 *                      the chip.
 * @default_resolution: Default number of bits to represent the temperature
 *                      value.
 * @resolution_limits:  Limit register resolution. Optional. Should be set if
 *                      the resolution of limit registers does not match the
 *                      resolution of the temperature register.
 * @resolutions:        List of resolutions associated with sample times.
 *                      Optional. Should be set if num_sample_times is larger
 *                      than 1, and if the resolution changes with sample times.
 *                      If set, number of entries must match num_sample_times.
 * @default_sample_time:Sample time to be set by default.
 * @num_sample_times:   Number of possible sample times to be set. Optional.
 *                      Should be set if the number of sample times is larger
 *                      than one.
 * @sample_times:       All the possible sample times to be set. Mandatory if
 *                      num_sample_times is larger than 1. If set, number of
 *                      entries must match num_sample_times.
 * @alarm:              Alarm bit is supported.
 */

struct lm75_params {
        bool                    config_reg_16bits;
        u16                     set_mask;
        u16                     clr_mask;
        u8                      default_resolution;
        u8                      resolution_limits;
        const u8                *resolutions;
        unsigned int            default_sample_time;
        u8                      num_sample_times;
        const unsigned int      *sample_times;
        bool                    alarm;
};

/* Addresses scanned */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
                                        0x4d, 0x4e, 0x4f, I2C_CLIENT_END };

/* The LM75 registers */
#define LM75_REG_TEMP           0x00
#define LM75_REG_CONF           0x01
#define LM75_REG_HYST           0x02
#define LM75_REG_MAX            0x03
#define PCT2075_REG_IDLE        0x04

struct lm75_data {
        const char *label;
        struct regmap                   *regmap;
        u16                             orig_conf;
        u8                              resolution;     /* In bits, 9 to 16 */
        unsigned int                    sample_time;    /* In ms */
        enum lm75_type                  kind;
        const struct lm75_params        *params;
        u8                              reg_buf[1];
        u8                              val_buf[3];
};

/*-----------------------------------------------------------------------*/

static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 };

#define LM75_ALERT_POLARITY_HIGH_8_BIT  (BIT(2))
#define LM75_ALERT_POLARITY_HIGH_16_BIT (BIT(2) << 8)
#define LM75_SAMPLE_CLEAR_MASK          (3 << 5)

/* The structure below stores the configuration values of the supported devices.
 * In case of being supported multiple configurations, the default one must
 * always be the first element of the array
 */
static const struct lm75_params device_params[] = {
        [adt75] = {
                .clr_mask = 1 << 5,     /* not one-shot mode */
                .default_resolution = 12,
                .default_sample_time = MSEC_PER_SEC / 10,
        },
        [as6200] = {
                .config_reg_16bits = true,
                .set_mask = 0xC010,     /* 8 sample/s, 4 CF */
                .default_resolution = 12,
                .default_sample_time = 125,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
                .alarm = true,
        },
        [at30ts74] = {
                .set_mask = 3 << 5,     /* 12-bit mode*/
                .default_resolution = 12,
                .default_sample_time = 200,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 25, 50, 100, 200 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [ds1775] = {
                .clr_mask = 3 << 5,
                .set_mask = 2 << 5,     /* 11-bit mode */
                .default_resolution = 11,
                .default_sample_time = 500,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 125, 250, 500, 1000 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [ds75] = {
                .clr_mask = 3 << 5,
                .set_mask = 2 << 5,     /* 11-bit mode */
                .default_resolution = 11,
                .default_sample_time = 600,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 150, 300, 600, 1200 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [stds75] = {
                .clr_mask = 3 << 5,
                .set_mask = 2 << 5,     /* 11-bit mode */
                .default_resolution = 11,
                .default_sample_time = 600,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 150, 300, 600, 1200 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [stlm75] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 6,
        },
        [ds7505] = {
                .set_mask = 3 << 5,     /* 12-bit mode*/
                .default_resolution = 12,
                .default_sample_time = 200,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 25, 50, 100, 200 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [g751] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 10,
        },
        [lm75] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 10,
        },
        [lm75a] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 10,
        },
        [lm75b] = {
                .default_resolution = 11,
                .default_sample_time = MSEC_PER_SEC / 10,
        },
        [max6625] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 7,
        },
        [max6626] = {
                .default_resolution = 12,
                .default_sample_time = MSEC_PER_SEC / 7,
                .resolution_limits = 9,
        },
        [max31725] = {
                .default_resolution = 16,
                .default_sample_time = MSEC_PER_SEC / 20,
        },
        [tcn75] = {
                .default_resolution = 9,
                .default_sample_time = MSEC_PER_SEC / 18,
        },
        [p3t1750] = {
                .clr_mask = 1 << 1 | 1 << 7,    /* disable SMBAlert and one-shot */
                .default_resolution = 12,
                .default_sample_time = 55,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
        },
        [p3t1755] = {
                .clr_mask = 1 << 1 | 1 << 7,    /* disable SMBAlert and one-shot */
                .default_resolution = 12,
                .default_sample_time = 55,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
        },
        [pct2075] = {
                .default_resolution = 11,
                .default_sample_time = MSEC_PER_SEC / 10,
                .num_sample_times = 31,
                .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600,
                700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700,
                1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
                2800, 2900, 3000, 3100 },
        },
        [mcp980x] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode */
                .default_resolution = 12,
                .resolution_limits = 9,
                .default_sample_time = 240,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 30, 60, 120, 240 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp100] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode */
                .default_resolution = 12,
                .default_sample_time = 320,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 40, 80, 160, 320 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp101] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode */
                .default_resolution = 12,
                .default_sample_time = 320,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 40, 80, 160, 320 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp105] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = 220,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp112] = {
                .config_reg_16bits = true,
                .set_mask = 0xC060,     /* 12-bit mode, 8 samples / second */
                .clr_mask = 1 << 7,     /* no one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = 125,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
                .alarm = true,
        },
        [tmp175] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = 220,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp275] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = 220,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp75] = {
                .set_mask = 3 << 5,     /* 12-bit mode */
                .clr_mask = 1 << 7,     /* not one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = 220,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
                .resolutions = (u8 []) {9, 10, 11, 12 },
        },
        [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */
                .clr_mask = 1 << 7 | 3 << 5,
                .default_resolution = 12,
                .default_sample_time = MSEC_PER_SEC / 37,
                .sample_times = (unsigned int []){ MSEC_PER_SEC / 37,
                        MSEC_PER_SEC / 18,
                        MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 },
                .num_sample_times = 4,
        },
        [tmp75c] = {
                .clr_mask = 1 << 5,     /*not one-shot mode*/
                .default_resolution = 12,
                .default_sample_time = MSEC_PER_SEC / 12,
        },
        [tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */
                .clr_mask = 1 << 5 | 1 << 6 | 1 << 7,
                .default_resolution = 12,
                .default_sample_time = 28,
                .num_sample_times = 4,
                .sample_times = (unsigned int []){ 28, 55, 110, 220 },
        }
};

static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
{
        return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
}

static inline int lm75_write_config(struct lm75_data *data, u16 set_mask,
                                    u16 clr_mask)
{
        return regmap_update_bits(data->regmap, LM75_REG_CONF,
                                  clr_mask | set_mask | LM75_SHUTDOWN, set_mask);
}

static irqreturn_t lm75_alarm_handler(int irq, void *private)
{
        struct device *hwmon_dev = private;

        hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0);
        return IRQ_HANDLED;
}

static int lm75_read_string(struct device *dev, enum hwmon_sensor_types type,
                            u32 attr, int channel, const char **str)
{
        struct lm75_data *data = dev_get_drvdata(dev);

        *str = data->label;

        return 0;
}

static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
                     u32 attr, int channel, long *val)
{
        struct lm75_data *data = dev_get_drvdata(dev);
        unsigned int regval;
        int err, reg;

        switch (type) {
        case hwmon_chip:
                switch (attr) {
                case hwmon_chip_update_interval:
                        *val = data->sample_time;
                        break;
                default:
                        return -EINVAL;
                }
                break;
        case hwmon_temp:
                switch (attr) {
                case hwmon_temp_input:
                        reg = LM75_REG_TEMP;
                        break;
                case hwmon_temp_max:
                        reg = LM75_REG_MAX;
                        break;
                case hwmon_temp_max_hyst:
                        reg = LM75_REG_HYST;
                        break;
                case hwmon_temp_alarm:
                        reg = LM75_REG_CONF;
                        break;
                default:
                        return -EINVAL;
                }
                err = regmap_read(data->regmap, reg, &regval);
                if (err < 0)
                        return err;

                if (attr == hwmon_temp_alarm) {
                        switch (data->kind) {
                        case as6200:
                        case tmp112:
                                *val = !!(regval & BIT(13)) == !!(regval & BIT(2));
                                break;
                        default:
                                return -EINVAL;
                        }
                } else {
                        *val = lm75_reg_to_mc(regval, data->resolution);
                }
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int lm75_write_temp(struct device *dev, u32 attr, long temp)
{
        struct lm75_data *data = dev_get_drvdata(dev);
        u8 resolution;
        int reg;

        switch (attr) {
        case hwmon_temp_max:
                reg = LM75_REG_MAX;
                break;
        case hwmon_temp_max_hyst:
                reg = LM75_REG_HYST;
                break;
        default:
                return -EINVAL;
        }

        /*
         * Resolution of limit registers is assumed to be the same as the
         * temperature input register resolution unless given explicitly.
         */
        if (data->params->resolution_limits)
                resolution = data->params->resolution_limits;
        else
                resolution = data->resolution;

        temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
        temp = DIV_ROUND_CLOSEST(temp  << (resolution - 8),
                                 1000) << (16 - resolution);

        return regmap_write(data->regmap, reg, (u16)temp);
}

static int lm75_update_interval(struct device *dev, long val)
{
        struct lm75_data *data = dev_get_drvdata(dev);
        u8 index;
        s32 err;

        index = find_closest(val, data->params->sample_times,
                             (int)data->params->num_sample_times);

        switch (data->kind) {
        default:
                err = lm75_write_config(data, lm75_sample_set_masks[index],
                                        LM75_SAMPLE_CLEAR_MASK);
                if (err)
                        return err;

                data->sample_time = data->params->sample_times[index];
                if (data->params->resolutions)
                        data->resolution = data->params->resolutions[index];
                break;
        case tmp112:
        case as6200:
                err = regmap_update_bits(data->regmap, LM75_REG_CONF,
                                         0xc000, (3 - index) << 14);
                if (err < 0)
                        return err;
                data->sample_time = data->params->sample_times[index];
                break;
        case pct2075:
                err = regmap_write(data->regmap, PCT2075_REG_IDLE, index + 1);
                if (err)
                        return err;
                data->sample_time = data->params->sample_times[index];
                break;
        }
        return 0;
}

static int lm75_write_chip(struct device *dev, u32 attr, long val)
{
        switch (attr) {
        case hwmon_chip_update_interval:
                return lm75_update_interval(dev, val);
        default:
                return -EINVAL;
        }
        return 0;
}

static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
                      u32 attr, int channel, long val)
{
        switch (type) {
        case hwmon_chip:
                return lm75_write_chip(dev, attr, val);
        case hwmon_temp:
                return lm75_write_temp(dev, attr, val);
        default:
                return -EINVAL;
        }
        return 0;
}

static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
                               u32 attr, int channel)
{
        const struct lm75_data *config_data = data;

        switch (type) {
        case hwmon_chip:
                switch (attr) {
                case hwmon_chip_update_interval:
                        if (config_data->params->num_sample_times > 1)
                                return 0644;
                        return 0444;
                default:
                        break;
                }
                break;
        case hwmon_temp:
                switch (attr) {
                case hwmon_temp_input:
                        return 0444;
                case hwmon_temp_label:
                /* Hide label node if label is not provided */
                        return config_data->label ? 0444 : 0;
                case hwmon_temp_max:
                case hwmon_temp_max_hyst:
                        return 0644;
                case hwmon_temp_alarm:
                        if (config_data->params->alarm)
                                return 0444;
                        break;
                default:
                        break;
                }
                break;
        default:
                break;
        }
        return 0;
}

static const struct hwmon_channel_info * const lm75_info[] = {
        HWMON_CHANNEL_INFO(chip,
                           HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
        HWMON_CHANNEL_INFO(temp,
                           HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX | HWMON_T_MAX_HYST |
                           HWMON_T_ALARM),
        NULL
};

static const struct hwmon_ops lm75_hwmon_ops = {
        .is_visible = lm75_is_visible,
        .read_string = lm75_read_string,
        .read = lm75_read,
        .write = lm75_write,
};

static const struct hwmon_chip_info lm75_chip_info = {
        .ops = &lm75_hwmon_ops,
        .info = lm75_info,
};

static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg)
{
        return reg != LM75_REG_TEMP;
}

static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
{
        return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
}

static int lm75_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
        struct i2c_client *client = context;
        struct lm75_data *data = i2c_get_clientdata(client);
        int ret;

        if (reg == LM75_REG_CONF) {
                if (!data->params->config_reg_16bits)
                        ret = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
                else
                        ret = i2c_smbus_read_word_data(client, LM75_REG_CONF);
        } else {
                ret = i2c_smbus_read_word_swapped(client, reg);
        }
        if (ret < 0)
                return ret;
        *val = ret;
        return 0;
}

static int lm75_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
{
        struct i2c_client *client = context;
        struct lm75_data *data = i2c_get_clientdata(client);

        if (reg == PCT2075_REG_IDLE ||
            (reg == LM75_REG_CONF && !data->params->config_reg_16bits))
                return i2c_smbus_write_byte_data(client, reg, val);
        else if (reg == LM75_REG_CONF)
                return i2c_smbus_write_word_data(client, reg, val);
        return i2c_smbus_write_word_swapped(client, reg, val);
}

static const struct regmap_bus lm75_i2c_regmap_bus = {
        .reg_read = lm75_i2c_reg_read,
        .reg_write = lm75_i2c_reg_write,
};

static int lm75_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
        struct i3c_device *i3cdev = context;
        struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
        struct i3c_xfer xfers[] = {
                {
                        .rnw = false,
                        .len = 1,
                        .data.out = data->reg_buf,
                },
                {
                        .rnw = true,
                        .len = 2,
                        .data.in = data->val_buf,
                },
        };
        int ret;

        data->reg_buf[0] = reg;

        if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
                xfers[1].len--;

        ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
        if (ret < 0)
                return ret;

        if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
                *val = data->val_buf[0];
        else if (reg == LM75_REG_CONF)
                *val = data->val_buf[0] | (data->val_buf[1] << 8);
        else
                *val = data->val_buf[1] | (data->val_buf[0] << 8);

        return 0;
}

static int lm75_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
{
        struct i3c_device *i3cdev = context;
        struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
        struct i3c_xfer xfers[] = {
                {
                        .rnw = false,
                        .len = 3,
                        .data.out = data->val_buf,
                },
        };

        data->val_buf[0] = reg;

        if (reg == PCT2075_REG_IDLE ||
            (reg == LM75_REG_CONF && !data->params->config_reg_16bits)) {
                xfers[0].len--;
                data->val_buf[1] = val & 0xff;
        } else if (reg == LM75_REG_CONF) {
                data->val_buf[1] = val & 0xff;
                data->val_buf[2] = (val >> 8) & 0xff;
        } else {
                data->val_buf[1] = (val >> 8) & 0xff;
                data->val_buf[2] = val & 0xff;
        }

        return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
}

static const struct regmap_bus lm75_i3c_regmap_bus = {
        .reg_read = lm75_i3c_reg_read,
        .reg_write = lm75_i3c_reg_write,
};

static const struct regmap_config lm75_regmap_config = {
        .reg_bits = 8,
        .val_bits = 16,
        .max_register = PCT2075_REG_IDLE,
        .writeable_reg = lm75_is_writeable_reg,
        .volatile_reg = lm75_is_volatile_reg,
        .val_format_endian = REGMAP_ENDIAN_BIG,
        .cache_type = REGCACHE_MAPLE,
        .use_single_read = true,
        .use_single_write = true,
};

static void lm75_remove(void *data)
{
        struct lm75_data *lm75 = data;

        regmap_write(lm75->regmap, LM75_REG_CONF, lm75->orig_conf);
}

static int lm75_generic_probe(struct device *dev, const char *name,
                              enum lm75_type kind, int irq, struct regmap *regmap)
{
        u16 clr_mask, pol_mask, set_mask;
        struct device *hwmon_dev;
        struct lm75_data *data;
        int status, err;

        data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        /* needed by custom regmap callbacks */
        dev_set_drvdata(dev, data);

        /* Save the connected input label if available */
        device_property_read_string(dev, "label", &data->label);

        data->kind = kind;
        data->regmap = regmap;

        err = devm_regulator_get_enable(dev, "vs");
        if (err)
                return err;

        /* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
         * Then tweak to be more precise when appropriate.
         */

        data->params = &device_params[data->kind];

        /* Save default sample time and resolution*/
        data->sample_time = data->params->default_sample_time;
        data->resolution = data->params->default_resolution;

        /* Cache original configuration */
        err = regmap_read(data->regmap, LM75_REG_CONF, &status);
        if (err)
                return err;
        data->orig_conf = status;

        /* Enforce polarity active-low (default) or active-high (devicetree) */
        if (!data->params->config_reg_16bits)
                pol_mask = LM75_ALERT_POLARITY_HIGH_8_BIT;
        else
                pol_mask = LM75_ALERT_POLARITY_HIGH_16_BIT;

        clr_mask = data->params->clr_mask | pol_mask;
        set_mask = data->params->set_mask & ~pol_mask;
        if (device_property_read_bool(dev, "ti,alert-polarity-active-high"))
                set_mask |= pol_mask;

        err = lm75_write_config(data, set_mask, clr_mask);
        if (err)
                return err;

        err = devm_add_action_or_reset(dev, lm75_remove, data);
        if (err)
                return err;

        hwmon_dev = devm_hwmon_device_register_with_info(dev, name, data,
                                                         &lm75_chip_info, NULL);
        if (IS_ERR(hwmon_dev))
                return PTR_ERR(hwmon_dev);

        if (irq) {
                if (data->params->alarm) {
                        err = devm_request_threaded_irq(dev,
                                                        irq,
                                                        NULL,
                                                        &lm75_alarm_handler,
                                                        IRQF_ONESHOT,
                                                        name,
                                                        hwmon_dev);
                        if (err)
                                return err;
                } else {
                         /* alarm is only supported for chips with alarm bit */
                        dev_err(dev, "alarm interrupt is not supported\n");
                }
        }

        dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), name);

        return 0;
}

static int lm75_i2c_probe(struct i2c_client *client)
{
        struct device *dev = &client->dev;
        struct regmap *regmap;

        if (!i2c_check_functionality(client->adapter,
                        I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
                return -EOPNOTSUPP;

        regmap = devm_regmap_init(dev, &lm75_i2c_regmap_bus, client, &lm75_regmap_config);
        if (IS_ERR(regmap))
                return PTR_ERR(regmap);

        return lm75_generic_probe(dev, client->name, (uintptr_t)i2c_get_match_data(client),
                                  client->irq, regmap);
}

static const struct i2c_device_id lm75_i2c_ids[] = {
        { .name = "adt75", .driver_data = adt75 },
        { .name = "as6200", .driver_data = as6200 },
        { .name = "at30ts74", .driver_data = at30ts74 },
        { .name = "ds1775", .driver_data = ds1775 },
        { .name = "ds75", .driver_data = ds75 },
        { .name = "ds7505", .driver_data = ds7505 },
        { .name = "g751", .driver_data = g751 },
        { .name = "lm75", .driver_data = lm75 },
        { .name = "lm75a", .driver_data = lm75a },
        { .name = "lm75b", .driver_data = lm75b },
        { .name = "max6625", .driver_data = max6625 },
        { .name = "max6626", .driver_data = max6626 },
        { .name = "max31725", .driver_data = max31725 },
        { .name = "max31726", .driver_data = max31725 },
        { .name = "mcp980x", .driver_data = mcp980x },
        { .name = "p3t1750", .driver_data = p3t1750 },
        { .name = "p3t1755", .driver_data = p3t1755 },
        { .name = "pct2075", .driver_data = pct2075 },
        { .name = "stds75", .driver_data = stds75 },
        { .name = "stlm75", .driver_data = stlm75 },
        { .name = "tcn75", .driver_data = tcn75 },
        { .name = "tmp100", .driver_data = tmp100 },
        { .name = "tmp101", .driver_data = tmp101 },
        { .name = "tmp105", .driver_data = tmp105 },
        { .name = "tmp112", .driver_data = tmp112 },
        { .name = "tmp175", .driver_data = tmp175 },
        { .name = "tmp275", .driver_data = tmp275 },
        { .name = "tmp75", .driver_data = tmp75 },
        { .name = "tmp75b", .driver_data = tmp75b },
        { .name = "tmp75c", .driver_data = tmp75c },
        { .name = "tmp1075", .driver_data = tmp1075 },
        { /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, lm75_i2c_ids);

struct lm75_i3c_device {
        enum lm75_type type;
        const char *name;
};

static const struct lm75_i3c_device lm75_i3c_p3t1755 = {
        .name = "p3t1755",
        .type = p3t1755,
};

static const struct i3c_device_id lm75_i3c_ids[] = {
        I3C_DEVICE(0x011b, 0x152a, &lm75_i3c_p3t1755),
        { /* LIST END */ }
};
MODULE_DEVICE_TABLE(i3c, lm75_i3c_ids);

static int lm75_i3c_probe(struct i3c_device *i3cdev)
{
        struct device *dev = i3cdev_to_dev(i3cdev);
        const struct lm75_i3c_device *id_data;
        struct regmap *regmap;

        regmap = devm_regmap_init(dev, &lm75_i3c_regmap_bus, i3cdev, &lm75_regmap_config);
        if (IS_ERR(regmap))
                return PTR_ERR(regmap);

        id_data = i3c_device_match_id(i3cdev, lm75_i3c_ids)->data;

        return lm75_generic_probe(dev, id_data->name, id_data->type, 0, regmap);
}

static const struct of_device_id lm75_of_match[] = {
        {
                .compatible = "adi,adt75",
                .data = (void *)adt75
        },
        {
                .compatible = "ams,as6200",
                .data = (void *)as6200
        },
        {
                .compatible = "atmel,at30ts74",
                .data = (void *)at30ts74
        },
        {
                .compatible = "dallas,ds1775",
                .data = (void *)ds1775
        },
        {
                .compatible = "dallas,ds75",
                .data = (void *)ds75
        },
        {
                .compatible = "dallas,ds7505",
                .data = (void *)ds7505
        },
        {
                .compatible = "gmt,g751",
                .data = (void *)g751
        },
        {
                .compatible = "national,lm75",
                .data = (void *)lm75
        },
        {
                .compatible = "national,lm75a",
                .data = (void *)lm75a
        },
        {
                .compatible = "national,lm75b",
                .data = (void *)lm75b
        },
        {
                .compatible = "maxim,max6625",
                .data = (void *)max6625
        },
        {
                .compatible = "maxim,max6626",
                .data = (void *)max6626
        },
        {
                .compatible = "maxim,max31725",
                .data = (void *)max31725
        },
        {
                .compatible = "maxim,max31726",
                .data = (void *)max31725
        },
        {
                .compatible = "maxim,mcp980x",
                .data = (void *)mcp980x
        },
        {
                .compatible = "nxp,p3t1750",
                .data = (void *)p3t1750
        },
        {
                .compatible = "nxp,p3t1755",
                .data = (void *)p3t1755
        },
        {
                .compatible = "nxp,pct2075",
                .data = (void *)pct2075
        },
        {
                .compatible = "st,stds75",
                .data = (void *)stds75
        },
        {
                .compatible = "st,stlm75",
                .data = (void *)stlm75
        },
        {
                .compatible = "microchip,tcn75",
                .data = (void *)tcn75
        },
        {
                .compatible = "ti,tmp100",
                .data = (void *)tmp100
        },
        {
                .compatible = "ti,tmp101",
                .data = (void *)tmp101
        },
        {
                .compatible = "ti,tmp105",
                .data = (void *)tmp105
        },
        {
                .compatible = "ti,tmp112",
                .data = (void *)tmp112
        },
        {
                .compatible = "ti,tmp175",
                .data = (void *)tmp175
        },
        {
                .compatible = "ti,tmp275",
                .data = (void *)tmp275
        },
        {
                .compatible = "ti,tmp75",
                .data = (void *)tmp75
        },
        {
                .compatible = "ti,tmp75b",
                .data = (void *)tmp75b
        },
        {
                .compatible = "ti,tmp75c",
                .data = (void *)tmp75c
        },
        {
                .compatible = "ti,tmp1075",
                .data = (void *)tmp1075
        },
        { },
};
MODULE_DEVICE_TABLE(of, lm75_of_match);

#define LM75A_ID 0xA1

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm75_detect(struct i2c_client *new_client,
                       struct i2c_board_info *info)
{
        struct i2c_adapter *adapter = new_client->adapter;
        int i;
        int conf, hyst, os;
        bool is_lm75a = 0;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
                                     I2C_FUNC_SMBUS_WORD_DATA))
                return -ENODEV;

        /*
         * Now, we do the remaining detection. There is no identification-
         * dedicated register so we have to rely on several tricks:
         * unused bits, registers cycling over 8-address boundaries,
         * addresses 0x04-0x07 returning the last read value.
         * The cycling+unused addresses combination is not tested,
         * since it would significantly slow the detection down and would
         * hardly add any value.
         *
         * The National Semiconductor LM75A is different than earlier
         * LM75s.  It has an ID byte of 0xaX (where X is the chip
         * revision, with 1 being the only revision in existence) in
         * register 7, and unused registers return 0xff rather than the
         * last read value.
         *
         * Note that this function only detects the original National
         * Semiconductor LM75 and the LM75A. Clones from other vendors
         * aren't detected, on purpose, because they are typically never
         * found on PC hardware. They are found on embedded designs where
         * they can be instantiated explicitly so detection is not needed.
         * The absence of identification registers on all these clones
         * would make their exhaustive detection very difficult and weak,
         * and odds are that the driver would bind to unsupported devices.
         */

        /* Unused bits */
        conf = i2c_smbus_read_byte_data(new_client, 1);
        if (conf & 0xe0)
                return -ENODEV;

        /* First check for LM75A */
        if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) {
                /*
                 * LM75A returns 0xff on unused registers so
                 * just to be sure we check for that too.
                 */
                if (i2c_smbus_read_byte_data(new_client, 4) != 0xff
                 || i2c_smbus_read_byte_data(new_client, 5) != 0xff
                 || i2c_smbus_read_byte_data(new_client, 6) != 0xff)
                        return -ENODEV;
                is_lm75a = 1;
                hyst = i2c_smbus_read_byte_data(new_client, 2);
                os = i2c_smbus_read_byte_data(new_client, 3);
        } else { /* Traditional style LM75 detection */
                /* Unused addresses */
                hyst = i2c_smbus_read_byte_data(new_client, 2);
                if (i2c_smbus_read_byte_data(new_client, 4) != hyst
                 || i2c_smbus_read_byte_data(new_client, 5) != hyst
                 || i2c_smbus_read_byte_data(new_client, 6) != hyst
                 || i2c_smbus_read_byte_data(new_client, 7) != hyst)
                        return -ENODEV;
                os = i2c_smbus_read_byte_data(new_client, 3);
                if (i2c_smbus_read_byte_data(new_client, 4) != os
                 || i2c_smbus_read_byte_data(new_client, 5) != os
                 || i2c_smbus_read_byte_data(new_client, 6) != os
                 || i2c_smbus_read_byte_data(new_client, 7) != os)
                        return -ENODEV;
        }
        /*
         * It is very unlikely that this is a LM75 if both
         * hysteresis and temperature limit registers are 0.
         */
        if (hyst == 0 && os == 0)
                return -ENODEV;

        /* Addresses cycling */
        for (i = 8; i <= 248; i += 40) {
                if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
                 || i2c_smbus_read_byte_data(new_client, i + 2) != hyst
                 || i2c_smbus_read_byte_data(new_client, i + 3) != os)
                        return -ENODEV;
                if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7)
                                != LM75A_ID)
                        return -ENODEV;
        }

        strscpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE);

        return 0;
}

#ifdef CONFIG_PM
static int lm75_suspend(struct device *dev)
{
        struct lm75_data *data = dev_get_drvdata(dev);

        return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, LM75_SHUTDOWN);
}

static int lm75_resume(struct device *dev)
{
        struct lm75_data *data = dev_get_drvdata(dev);

        return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, 0);
}

static const struct dev_pm_ops lm75_dev_pm_ops = {
        .suspend        = lm75_suspend,
        .resume         = lm75_resume,
};
#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops)
#else
#define LM75_DEV_PM_OPS NULL
#endif /* CONFIG_PM */

static struct i2c_driver lm75_i2c_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "lm75",
                .of_match_table = lm75_of_match,
                .pm     = LM75_DEV_PM_OPS,
        },
        .probe          = lm75_i2c_probe,
        .id_table       = lm75_i2c_ids,
        .detect         = lm75_detect,
        .address_list   = normal_i2c,
};

static struct i3c_driver lm75_i3c_driver = {
        .driver = {
                .name = "lm75_i3c",
        },
        .probe = lm75_i3c_probe,
        .id_table = lm75_i3c_ids,
};

module_i3c_i2c_driver(lm75_i3c_driver, &lm75_i2c_driver)

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
MODULE_DESCRIPTION("LM75 driver");
MODULE_LICENSE("GPL");