/* tmp401.c
 *
 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
 * Preliminary tmp411 support by:
 * Gabriel Konat, Sander Leget, Wouter Willems
 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
 *
 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
 *
 * Note this IC is in some aspect similar to the LM90, but it has quite a
 * few differences too, for example the local temp has a higher resolution
 * and thus has 16 bits registers for its value and limit instead of 8 bits.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/bitops.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>
#include <linux/sysfs.h>

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

enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };

/*
 * The TMP401 registers, note some registers have different addresses for
 * reading and writing
 */
#define TMP401_STATUS                           0x02
#define TMP401_CONFIG_READ                      0x03
#define TMP401_CONFIG_WRITE                     0x09
#define TMP401_CONVERSION_RATE_READ             0x04
#define TMP401_CONVERSION_RATE_WRITE            0x0A
#define TMP401_TEMP_CRIT_HYST                   0x21
#define TMP401_MANUFACTURER_ID_REG              0xFE
#define TMP401_DEVICE_ID_REG                    0xFF

static const u8 TMP401_TEMP_MSB_READ[6][2] = {
        { 0x00, 0x01 }, /* temp */
        { 0x06, 0x08 }, /* low limit */
        { 0x05, 0x07 }, /* high limit */
        { 0x20, 0x19 }, /* therm (crit) limit */
        { 0x30, 0x34 }, /* lowest */
        { 0x32, 0x36 }, /* highest */
};

static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
        { 0, 0 },       /* temp (unused) */
        { 0x0C, 0x0E }, /* low limit */
        { 0x0B, 0x0D }, /* high limit */
        { 0x20, 0x19 }, /* therm (crit) limit */
        { 0x30, 0x34 }, /* lowest */
        { 0x32, 0x36 }, /* highest */
};

static const u8 TMP401_TEMP_LSB[6][2] = {
        { 0x15, 0x10 }, /* temp */
        { 0x17, 0x14 }, /* low limit */
        { 0x16, 0x13 }, /* high limit */
        { 0, 0 },       /* therm (crit) limit (unused) */
        { 0x31, 0x35 }, /* lowest */
        { 0x33, 0x37 }, /* highest */
};

static const u8 TMP432_TEMP_MSB_READ[4][3] = {
        { 0x00, 0x01, 0x23 },   /* temp */
        { 0x06, 0x08, 0x16 },   /* low limit */
        { 0x05, 0x07, 0x15 },   /* high limit */
        { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
};

static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
        { 0, 0, 0 },            /* temp  - unused */
        { 0x0C, 0x0E, 0x16 },   /* low limit */
        { 0x0B, 0x0D, 0x15 },   /* high limit */
        { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
};

static const u8 TMP432_TEMP_LSB[3][3] = {
        { 0x29, 0x10, 0x24 },   /* temp */
        { 0x3E, 0x14, 0x18 },   /* low limit */
        { 0x3D, 0x13, 0x17 },   /* high limit */
};

/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
static const u8 TMP432_STATUS_REG[] = {
        0x1b, 0x36, 0x35, 0x37 };

/* Flags */
#define TMP401_CONFIG_RANGE                     BIT(2)
#define TMP401_CONFIG_SHUTDOWN                  BIT(6)
#define TMP401_STATUS_LOCAL_CRIT                BIT(0)
#define TMP401_STATUS_REMOTE_CRIT               BIT(1)
#define TMP401_STATUS_REMOTE_OPEN               BIT(2)
#define TMP401_STATUS_REMOTE_LOW                BIT(3)
#define TMP401_STATUS_REMOTE_HIGH               BIT(4)
#define TMP401_STATUS_LOCAL_LOW                 BIT(5)
#define TMP401_STATUS_LOCAL_HIGH                BIT(6)

/* On TMP432, each status has its own register */
#define TMP432_STATUS_LOCAL                     BIT(0)
#define TMP432_STATUS_REMOTE1                   BIT(1)
#define TMP432_STATUS_REMOTE2                   BIT(2)

/* Manufacturer / Device ID's */
#define TMP401_MANUFACTURER_ID                  0x55
#define TMP401_DEVICE_ID                        0x11
#define TMP411A_DEVICE_ID                       0x12
#define TMP411B_DEVICE_ID                       0x13
#define TMP411C_DEVICE_ID                       0x10
#define TMP431_DEVICE_ID                        0x31
#define TMP432_DEVICE_ID                        0x32
#define TMP435_DEVICE_ID                        0x35

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id tmp401_id[] = {
        { "tmp401", tmp401 },
        { "tmp411", tmp411 },
        { "tmp431", tmp431 },
        { "tmp432", tmp432 },
        { "tmp435", tmp435 },
        { }
};
MODULE_DEVICE_TABLE(i2c, tmp401_id);

/*
 * Client data (each client gets its own)
 */

struct tmp401_data {
        struct i2c_client *client;
        const struct attribute_group *groups[3];
        struct mutex update_lock;
        char valid; /* zero until following fields are valid */
        unsigned long last_updated; /* in jiffies */
        enum chips kind;

        unsigned int update_interval;   /* in milliseconds */

        /* register values */
        u8 status[4];
        u8 config;
        u16 temp[6][3];
        u8 temp_crit_hyst;
};

/*
 * Sysfs attr show / store functions
 */

static int tmp401_register_to_temp(u16 reg, u8 config)
{
        int temp = reg;

        if (config & TMP401_CONFIG_RANGE)
                temp -= 64 * 256;

        return DIV_ROUND_CLOSEST(temp * 125, 32);
}

static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
{
        if (config & TMP401_CONFIG_RANGE) {
                temp = clamp_val(temp, -64000, 191000);
                temp += 64000;
        } else
                temp = clamp_val(temp, 0, 127000);

        return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
}

static int tmp401_update_device_reg16(struct i2c_client *client,
                                      struct tmp401_data *data)
{
        int i, j, val;
        int num_regs = data->kind == tmp411 ? 6 : 4;
        int num_sensors = data->kind == tmp432 ? 3 : 2;

        for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
                for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
                        u8 regaddr;
                        /*
                         * High byte must be read first immediately followed
                         * by the low byte
                         */
                        regaddr = data->kind == tmp432 ?
                                                TMP432_TEMP_MSB_READ[j][i] :
                                                TMP401_TEMP_MSB_READ[j][i];
                        val = i2c_smbus_read_byte_data(client, regaddr);
                        if (val < 0)
                                return val;
                        data->temp[j][i] = val << 8;
                        if (j == 3)             /* crit is msb only */
                                continue;
                        regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
                                                       : TMP401_TEMP_LSB[j][i];
                        val = i2c_smbus_read_byte_data(client, regaddr);
                        if (val < 0)
                                return val;
                        data->temp[j][i] |= val;
                }
        }
        return 0;
}

static struct tmp401_data *tmp401_update_device(struct device *dev)
{
        struct tmp401_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->client;
        struct tmp401_data *ret = data;
        int i, val;
        unsigned long next_update;

        mutex_lock(&data->update_lock);

        next_update = data->last_updated +
                      msecs_to_jiffies(data->update_interval);
        if (time_after(jiffies, next_update) || !data->valid) {
                if (data->kind != tmp432) {
                        /*
                         * The driver uses the TMP432 status format internally.
                         * Convert status to TMP432 format for other chips.
                         */
                        val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
                        if (val < 0) {
                                ret = ERR_PTR(val);
                                goto abort;
                        }
                        data->status[0] =
                          (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
                        data->status[1] =
                          ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
                          ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
                        data->status[2] =
                          ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
                          ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
                        data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
                                                | TMP401_STATUS_REMOTE_CRIT);
                } else {
                        for (i = 0; i < ARRAY_SIZE(data->status); i++) {
                                val = i2c_smbus_read_byte_data(client,
                                                        TMP432_STATUS_REG[i]);
                                if (val < 0) {
                                        ret = ERR_PTR(val);
                                        goto abort;
                                }
                                data->status[i] = val;
                        }
                }

                val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
                if (val < 0) {
                        ret = ERR_PTR(val);
                        goto abort;
                }
                data->config = val;
                val = tmp401_update_device_reg16(client, data);
                if (val < 0) {
                        ret = ERR_PTR(val);
                        goto abort;
                }
                val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
                if (val < 0) {
                        ret = ERR_PTR(val);
                        goto abort;
                }
                data->temp_crit_hyst = val;

                data->last_updated = jiffies;
                data->valid = 1;
        }

abort:
        mutex_unlock(&data->update_lock);
        return ret;
}

static ssize_t show_temp(struct device *dev,
                         struct device_attribute *devattr, char *buf)
{
        int nr = to_sensor_dev_attr_2(devattr)->nr;
        int index = to_sensor_dev_attr_2(devattr)->index;
        struct tmp401_data *data = tmp401_update_device(dev);

        if (IS_ERR(data))
                return PTR_ERR(data);

        return sprintf(buf, "%d\n",
                tmp401_register_to_temp(data->temp[nr][index], data->config));
}

static ssize_t show_temp_crit_hyst(struct device *dev,
        struct device_attribute *devattr, char *buf)
{
        int temp, index = to_sensor_dev_attr(devattr)->index;
        struct tmp401_data *data = tmp401_update_device(dev);

        if (IS_ERR(data))
                return PTR_ERR(data);

        mutex_lock(&data->update_lock);
        temp = tmp401_register_to_temp(data->temp[3][index], data->config);
        temp -= data->temp_crit_hyst * 1000;
        mutex_unlock(&data->update_lock);

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

static ssize_t show_status(struct device *dev,
        struct device_attribute *devattr, char *buf)
{
        int nr = to_sensor_dev_attr_2(devattr)->nr;
        int mask = to_sensor_dev_attr_2(devattr)->index;
        struct tmp401_data *data = tmp401_update_device(dev);

        if (IS_ERR(data))
                return PTR_ERR(data);

        return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
}

static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
                          const char *buf, size_t count)
{
        int nr = to_sensor_dev_attr_2(devattr)->nr;
        int index = to_sensor_dev_attr_2(devattr)->index;
        struct tmp401_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->client;
        long val;
        u16 reg;
        u8 regaddr;

        if (kstrtol(buf, 10, &val))
                return -EINVAL;

        reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);

        mutex_lock(&data->update_lock);

        regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
                                       : TMP401_TEMP_MSB_WRITE[nr][index];
        i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
        if (nr != 3) {
                regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
                                               : TMP401_TEMP_LSB[nr][index];
                i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
        }
        data->temp[nr][index] = reg;

        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
        *devattr, const char *buf, size_t count)
{
        int temp, index = to_sensor_dev_attr(devattr)->index;
        struct tmp401_data *data = tmp401_update_device(dev);
        long val;
        u8 reg;

        if (IS_ERR(data))
                return PTR_ERR(data);

        if (kstrtol(buf, 10, &val))
                return -EINVAL;

        if (data->config & TMP401_CONFIG_RANGE)
                val = clamp_val(val, -64000, 191000);
        else
                val = clamp_val(val, 0, 127000);

        mutex_lock(&data->update_lock);
        temp = tmp401_register_to_temp(data->temp[3][index], data->config);
        val = clamp_val(val, temp - 255000, temp);
        reg = ((temp - val) + 500) / 1000;

        i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
                                  reg);

        data->temp_crit_hyst = reg;

        mutex_unlock(&data->update_lock);

        return count;
}

/*
 * Resets the historical measurements of minimum and maximum temperatures.
 * This is done by writing any value to any of the minimum/maximum registers
 * (0x30-0x37).
 */
static ssize_t reset_temp_history(struct device *dev,
        struct device_attribute *devattr, const char *buf, size_t count)
{
        struct tmp401_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->client;
        long val;

        if (kstrtol(buf, 10, &val))
                return -EINVAL;

        if (val != 1) {
                dev_err(dev,
                        "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
                        val);
                return -EINVAL;
        }
        mutex_lock(&data->update_lock);
        i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
        data->valid = 0;
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t show_update_interval(struct device *dev,
                                    struct device_attribute *attr, char *buf)
{
        struct tmp401_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%u\n", data->update_interval);
}

static ssize_t set_update_interval(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
{
        struct tmp401_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->client;
        unsigned long val;
        int err, rate;

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

        /*
         * For valid rates, interval can be calculated as
         *      interval = (1 << (7 - rate)) * 125;
         * Rounded rate is therefore
         *      rate = 7 - __fls(interval * 4 / (125 * 3));
         * Use clamp_val() to avoid overflows, and to ensure valid input
         * for __fls.
         */
        val = clamp_val(val, 125, 16000);
        rate = 7 - __fls(val * 4 / (125 * 3));
        mutex_lock(&data->update_lock);
        i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
        data->update_interval = (1 << (7 - rate)) * 125;
        mutex_unlock(&data->update_lock);

        return count;
}

static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 1, 0);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 3, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
                          show_temp_crit_hyst, store_temp_crit_hyst, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
                            1, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
                            2, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
                            3, TMP432_STATUS_LOCAL);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 1, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 3, 1);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
                          NULL, 1);
static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
                            0, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
                            1, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
                            2, TMP432_STATUS_REMOTE1);
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
                            3, TMP432_STATUS_REMOTE1);

static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
                   set_update_interval);

static struct attribute *tmp401_attributes[] = {
        &sensor_dev_attr_temp1_input.dev_attr.attr,
        &sensor_dev_attr_temp1_min.dev_attr.attr,
        &sensor_dev_attr_temp1_max.dev_attr.attr,
        &sensor_dev_attr_temp1_crit.dev_attr.attr,
        &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,

        &sensor_dev_attr_temp2_input.dev_attr.attr,
        &sensor_dev_attr_temp2_min.dev_attr.attr,
        &sensor_dev_attr_temp2_max.dev_attr.attr,
        &sensor_dev_attr_temp2_crit.dev_attr.attr,
        &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_temp2_fault.dev_attr.attr,
        &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
        &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
        &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,

        &dev_attr_update_interval.attr,

        NULL
};

static const struct attribute_group tmp401_group = {
        .attrs = tmp401_attributes,
};

/*
 * Additional features of the TMP411 chip.
 * The TMP411 stores the minimum and maximum
 * temperature measured since power-on, chip-reset, or
 * minimum and maximum register reset for both the local
 * and remote channels.
 */
static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
                          0);

static struct attribute *tmp411_attributes[] = {
        &sensor_dev_attr_temp1_highest.dev_attr.attr,
        &sensor_dev_attr_temp1_lowest.dev_attr.attr,
        &sensor_dev_attr_temp2_highest.dev_attr.attr,
        &sensor_dev_attr_temp2_lowest.dev_attr.attr,
        &sensor_dev_attr_temp_reset_history.dev_attr.attr,
        NULL
};

static const struct attribute_group tmp411_group = {
        .attrs = tmp411_attributes,
};

static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 1, 2);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
                            store_temp, 3, 2);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
                          NULL, 2);
static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
                            0, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
                            1, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
                            2, TMP432_STATUS_REMOTE2);
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
                            3, TMP432_STATUS_REMOTE2);

static struct attribute *tmp432_attributes[] = {
        &sensor_dev_attr_temp3_input.dev_attr.attr,
        &sensor_dev_attr_temp3_min.dev_attr.attr,
        &sensor_dev_attr_temp3_max.dev_attr.attr,
        &sensor_dev_attr_temp3_crit.dev_attr.attr,
        &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_temp3_fault.dev_attr.attr,
        &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
        &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
        &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,

        NULL
};

static const struct attribute_group tmp432_group = {
        .attrs = tmp432_attributes,
};

/*
 * Begin non sysfs callback code (aka Real code)
 */

static int tmp401_init_client(struct tmp401_data *data,
                              struct i2c_client *client)
{
        int config, config_orig, status = 0;

        /* Set the conversion rate to 2 Hz */
        i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
        data->update_interval = 500;

        /* Start conversions (disable shutdown if necessary) */
        config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
        if (config < 0)
                return config;

        config_orig = config;
        config &= ~TMP401_CONFIG_SHUTDOWN;

        if (config != config_orig)
                status = i2c_smbus_write_byte_data(client,
                                                   TMP401_CONFIG_WRITE,
                                                   config);

        return status;
}

static int tmp401_detect(struct i2c_client *client,
                         struct i2c_board_info *info)
{
        enum chips kind;
        struct i2c_adapter *adapter = client->adapter;
        u8 reg;

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

        /* Detect and identify the chip */
        reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
        if (reg != TMP401_MANUFACTURER_ID)
                return -ENODEV;

        reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);

        switch (reg) {
        case TMP401_DEVICE_ID:
                if (client->addr != 0x4c)
                        return -ENODEV;
                kind = tmp401;
                break;
        case TMP411A_DEVICE_ID:
                if (client->addr != 0x4c)
                        return -ENODEV;
                kind = tmp411;
                break;
        case TMP411B_DEVICE_ID:
                if (client->addr != 0x4d)
                        return -ENODEV;
                kind = tmp411;
                break;
        case TMP411C_DEVICE_ID:
                if (client->addr != 0x4e)
                        return -ENODEV;
                kind = tmp411;
                break;
        case TMP431_DEVICE_ID:
                if (client->addr != 0x4c && client->addr != 0x4d)
                        return -ENODEV;
                kind = tmp431;
                break;
        case TMP432_DEVICE_ID:
                if (client->addr != 0x4c && client->addr != 0x4d)
                        return -ENODEV;
                kind = tmp432;
                break;
        case TMP435_DEVICE_ID:
                kind = tmp435;
                break;
        default:
                return -ENODEV;
        }

        reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
        if (reg & 0x1b)
                return -ENODEV;

        reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
        /* Datasheet says: 0x1-0x6 */
        if (reg > 15)
                return -ENODEV;

        strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);

        return 0;
}

static int tmp401_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
{
        static const char * const names[] = {
                "TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
        };
        struct device *dev = &client->dev;
        struct device *hwmon_dev;
        struct tmp401_data *data;
        int groups = 0, status;

        data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        data->client = client;
        mutex_init(&data->update_lock);
        data->kind = id->driver_data;

        /* Initialize the TMP401 chip */
        status = tmp401_init_client(data, client);
        if (status < 0)
                return status;

        /* Register sysfs hooks */
        data->groups[groups++] = &tmp401_group;

        /* Register additional tmp411 sysfs hooks */
        if (data->kind == tmp411)
                data->groups[groups++] = &tmp411_group;

        /* Register additional tmp432 sysfs hooks */
        if (data->kind == tmp432)
                data->groups[groups++] = &tmp432_group;

        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
                                                           data, data->groups);
        if (IS_ERR(hwmon_dev))
                return PTR_ERR(hwmon_dev);

        dev_info(dev, "Detected TI %s chip\n", names[data->kind]);

        return 0;
}

static struct i2c_driver tmp401_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "tmp401",
        },
        .probe          = tmp401_probe,
        .id_table       = tmp401_id,
        .detect         = tmp401_detect,
        .address_list   = normal_i2c,
};

module_i2c_driver(tmp401_driver);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
MODULE_LICENSE("GPL");