[PATCH] W1: w1_netlink: New init/fini netlink callbacks.

[linux-2.6/verdex.git] / drivers / hwmon / lm90.c

/*
 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2005  Jean Delvare <khali@linux-fr.org>
 *
 * Based on the lm83 driver. The LM90 is a sensor chip made by National
 * Semiconductor. It reports up to two temperatures (its own plus up to
 * one external one) with a 0.125 deg resolution (1 deg for local
 * temperature) and a 3-4 deg accuracy. Complete datasheet can be
 * obtained from National's website at:
 *   http://www.national.com/pf/LM/LM90.html
 *
 * This driver also supports the LM89 and LM99, two other sensor chips
 * made by National Semiconductor. Both have an increased remote
 * temperature measurement accuracy (1 degree), and the LM99
 * additionally shifts remote temperatures (measured and limits) by 16
 * degrees, which allows for higher temperatures measurement. The
 * driver doesn't handle it since it can be done easily in user-space.
 * Complete datasheets can be obtained from National's website at:
 *   http://www.national.com/pf/LM/LM89.html
 *   http://www.national.com/pf/LM/LM99.html
 * Note that there is no way to differentiate between both chips.
 *
 * This driver also supports the LM86, another sensor chip made by
 * National Semiconductor. It is exactly similar to the LM90 except it
 * has a higher accuracy.
 * Complete datasheet can be obtained from National's website at:
 *   http://www.national.com/pf/LM/LM86.html
 *
 * This driver also supports the ADM1032, a sensor chip made by Analog
 * Devices. That chip is similar to the LM90, with a few differences
 * that are not handled by this driver. Complete datasheet can be
 * obtained from Analog's website at:
 *   http://products.analog.com/products/info.asp?product=ADM1032
 * Among others, it has a higher accuracy than the LM90, much like the
 * LM86 does.
 *
 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
 * chips made by Maxim. These chips are similar to the LM86. Complete
 * datasheet can be obtained at Maxim's website at:
 *   http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
 * Note that there is no easy way to differentiate between the three
 * variants. The extra address and features of the MAX6659 are not
 * supported by this driver.
 *
 * This driver also supports the ADT7461 chip from Analog Devices but
 * only in its "compatability mode". If an ADT7461 chip is found but
 * is configured in non-compatible mode (where its temperature
 * register values are decoded differently) it is ignored by this
 * driver. Complete datasheet can be obtained from Analog's website
 * at:
 *   http://products.analog.com/products/info.asp?product=ADT7461
 *
 * Since the LM90 was the first chipset supported by this driver, most
 * comments will refer to this chipset, but are actually general and
 * concern all supported chipsets, unless mentioned otherwise.
 *
 * 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.
 */

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

/*
 * Addresses to scan
 * Address is fully defined internally and cannot be changed except for
 * MAX6659.
 * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c.
 * LM89-1, and LM99-1 have address 0x4d.
 * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
 * ADT7461 always has address 0x4c.
 */

static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461);

/*
 * The LM90 registers
 */

#define LM90_REG_R_MAN_ID               0xFE
#define LM90_REG_R_CHIP_ID              0xFF
#define LM90_REG_R_CONFIG1              0x03
#define LM90_REG_W_CONFIG1              0x09
#define LM90_REG_R_CONFIG2              0xBF
#define LM90_REG_W_CONFIG2              0xBF
#define LM90_REG_R_CONVRATE             0x04
#define LM90_REG_W_CONVRATE             0x0A
#define LM90_REG_R_STATUS               0x02
#define LM90_REG_R_LOCAL_TEMP           0x00
#define LM90_REG_R_LOCAL_HIGH           0x05
#define LM90_REG_W_LOCAL_HIGH           0x0B
#define LM90_REG_R_LOCAL_LOW            0x06
#define LM90_REG_W_LOCAL_LOW            0x0C
#define LM90_REG_R_LOCAL_CRIT           0x20
#define LM90_REG_W_LOCAL_CRIT           0x20
#define LM90_REG_R_REMOTE_TEMPH         0x01
#define LM90_REG_R_REMOTE_TEMPL         0x10
#define LM90_REG_R_REMOTE_OFFSH         0x11
#define LM90_REG_W_REMOTE_OFFSH         0x11
#define LM90_REG_R_REMOTE_OFFSL         0x12
#define LM90_REG_W_REMOTE_OFFSL         0x12
#define LM90_REG_R_REMOTE_HIGHH         0x07
#define LM90_REG_W_REMOTE_HIGHH         0x0D
#define LM90_REG_R_REMOTE_HIGHL         0x13
#define LM90_REG_W_REMOTE_HIGHL         0x13
#define LM90_REG_R_REMOTE_LOWH          0x08
#define LM90_REG_W_REMOTE_LOWH          0x0E
#define LM90_REG_R_REMOTE_LOWL          0x14
#define LM90_REG_W_REMOTE_LOWL          0x14
#define LM90_REG_R_REMOTE_CRIT          0x19
#define LM90_REG_W_REMOTE_CRIT          0x19
#define LM90_REG_R_TCRIT_HYST           0x21
#define LM90_REG_W_TCRIT_HYST           0x21

/*
 * Conversions and various macros
 * For local temperatures and limits, critical limits and the hysteresis
 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
 * For remote temperatures and limits, it uses signed 11-bit values with
 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
 */

#define TEMP1_FROM_REG(val)     ((val) * 1000)
#define TEMP1_TO_REG(val)       ((val) <= -128000 ? -128 : \
                                 (val) >= 127000 ? 127 : \
                                 (val) < 0 ? ((val) - 500) / 1000 : \
                                 ((val) + 500) / 1000)
#define TEMP2_FROM_REG(val)     ((val) / 32 * 125)
#define TEMP2_TO_REG(val)       ((val) <= -128000 ? 0x8000 : \
                                 (val) >= 127875 ? 0x7FE0 : \
                                 (val) < 0 ? ((val) - 62) / 125 * 32 : \
                                 ((val) + 62) / 125 * 32)
#define HYST_TO_REG(val)        ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
                                 ((val) + 500) / 1000)

/* 
 * ADT7461 is almost identical to LM90 except that attempts to write
 * values that are outside the range 0 < temp < 127 are treated as
 * the boundary value. 
 */

#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
                                 (val) >= 127000 ? 127 : \
                                 ((val) + 500) / 1000)
#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
                                 (val) >= 127750 ? 0x7FC0 : \
                                 ((val) + 125) / 250 * 64)

/*
 * Functions declaration
 */

static int lm90_attach_adapter(struct i2c_adapter *adapter);
static int lm90_detect(struct i2c_adapter *adapter, int address,
        int kind);
static void lm90_init_client(struct i2c_client *client);
static int lm90_detach_client(struct i2c_client *client);
static struct lm90_data *lm90_update_device(struct device *dev);

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

static struct i2c_driver lm90_driver = {
        .owner          = THIS_MODULE,
        .name           = "lm90",
        .id             = I2C_DRIVERID_LM90,
        .flags          = I2C_DF_NOTIFY,
        .attach_adapter = lm90_attach_adapter,
        .detach_client  = lm90_detach_client,
};

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

struct lm90_data {
        struct i2c_client client;
        struct class_device *class_dev;
        struct semaphore update_lock;
        char valid; /* zero until following fields are valid */
        unsigned long last_updated; /* in jiffies */
        int kind;

        /* registers values */
        s8 temp8[5];    /* 0: local input
                           1: local low limit
                           2: local high limit
                           3: local critical limit
                           4: remote critical limit */
        s16 temp11[3];  /* 0: remote input
                           1: remote low limit
                           2: remote high limit */
        u8 temp_hyst;
        u8 alarms; /* bitvector */
};

/*
 * Sysfs stuff
 */

static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
                          char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct lm90_data *data = lm90_update_device(dev);
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
}

static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
                         const char *buf, size_t count)
{
        static const u8 reg[4] = {
                LM90_REG_W_LOCAL_LOW,
                LM90_REG_W_LOCAL_HIGH,
                LM90_REG_W_LOCAL_CRIT,
                LM90_REG_W_REMOTE_CRIT,
        };

        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct i2c_client *client = to_i2c_client(dev);
        struct lm90_data *data = i2c_get_clientdata(client);
        long val = simple_strtol(buf, NULL, 10);
        int nr = attr->index;

        down(&data->update_lock);
        if (data->kind == adt7461)
                data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
        else
                data->temp8[nr] = TEMP1_TO_REG(val);
        i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
        up(&data->update_lock);
        return count;
}

static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
                           char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct lm90_data *data = lm90_update_device(dev);
        return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
}

static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
                          const char *buf, size_t count)
{
        static const u8 reg[4] = {
                LM90_REG_W_REMOTE_LOWH,
                LM90_REG_W_REMOTE_LOWL,
                LM90_REG_W_REMOTE_HIGHH,
                LM90_REG_W_REMOTE_HIGHL,
        };

        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct i2c_client *client = to_i2c_client(dev);
        struct lm90_data *data = i2c_get_clientdata(client);
        long val = simple_strtol(buf, NULL, 10);
        int nr = attr->index;

        down(&data->update_lock);
        if (data->kind == adt7461)
                data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
        else
                data->temp11[nr] = TEMP2_TO_REG(val);
        i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
                                  data->temp11[nr] >> 8);
        i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
                                  data->temp11[nr] & 0xff);
        up(&data->update_lock);
        return count;
}

static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
                             char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct lm90_data *data = lm90_update_device(dev);
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
                       - TEMP1_FROM_REG(data->temp_hyst));
}

static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
                            const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct lm90_data *data = i2c_get_clientdata(client);
        long val = simple_strtol(buf, NULL, 10);
        long hyst;

        down(&data->update_lock);
        hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
        i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
                                  HYST_TO_REG(hyst));
        up(&data->update_lock);
        return count;
}

static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
                           char *buf)
{
        struct lm90_data *data = lm90_update_device(dev);
        return sprintf(buf, "%d\n", data->alarms);
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
        set_temp8, 1);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
        set_temp11, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
        set_temp8, 2);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
        set_temp11, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
        set_temp8, 3);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
        set_temp8, 4);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
        set_temphyst, 3);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/*
 * Real code
 */

static int lm90_attach_adapter(struct i2c_adapter *adapter)
{
        if (!(adapter->class & I2C_CLASS_HWMON))
                return 0;
        return i2c_probe(adapter, &addr_data, lm90_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
{
        struct i2c_client *new_client;
        struct lm90_data *data;
        int err = 0;
        const char *name = "";

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                goto exit;

        if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
                err = -ENOMEM;
                goto exit;
        }
        memset(data, 0, sizeof(struct lm90_data));

        /* The common I2C client data is placed right before the
           LM90-specific data. */
        new_client = &data->client;
        i2c_set_clientdata(new_client, data);
        new_client->addr = address;
        new_client->adapter = adapter;
        new_client->driver = &lm90_driver;
        new_client->flags = 0;

        /*
         * Now we do the remaining detection. A negative kind means that
         * the driver was loaded with no force parameter (default), so we
         * must both detect and identify the chip. A zero kind means that
         * the driver was loaded with the force parameter, the detection
         * step shall be skipped. A positive kind means that the driver
         * was loaded with the force parameter and a given kind of chip is
         * requested, so both the detection and the identification steps
         * are skipped.
         */

        /* Default to an LM90 if forced */
        if (kind == 0)
                kind = lm90;

        if (kind < 0) { /* detection and identification */
                u8 man_id, chip_id, reg_config1, reg_convrate;

                man_id = i2c_smbus_read_byte_data(new_client,
                         LM90_REG_R_MAN_ID);
                chip_id = i2c_smbus_read_byte_data(new_client,
                          LM90_REG_R_CHIP_ID);
                reg_config1 = i2c_smbus_read_byte_data(new_client,
                              LM90_REG_R_CONFIG1);
                reg_convrate = i2c_smbus_read_byte_data(new_client,
                               LM90_REG_R_CONVRATE);
                
                if (man_id == 0x01) { /* National Semiconductor */
                        u8 reg_config2;

                        reg_config2 = i2c_smbus_read_byte_data(new_client,
                                      LM90_REG_R_CONFIG2);

                        if ((reg_config1 & 0x2A) == 0x00
                         && (reg_config2 & 0xF8) == 0x00
                         && reg_convrate <= 0x09) {
                                if (address == 0x4C
                                 && (chip_id & 0xF0) == 0x20) { /* LM90 */
                                        kind = lm90;
                                } else
                                if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
                                        kind = lm99;
                                } else
                                if (address == 0x4C
                                 && (chip_id & 0xF0) == 0x10) { /* LM86 */
                                        kind = lm86;
                                }
                        }
                } else
                if (man_id == 0x41) { /* Analog Devices */
                        if (address == 0x4C
                         && (chip_id & 0xF0) == 0x40 /* ADM1032 */
                         && (reg_config1 & 0x3F) == 0x00
                         && reg_convrate <= 0x0A) {
                                kind = adm1032;
                        } else
                        if (address == 0x4c
                         && chip_id == 0x51 /* ADT7461 */
                         && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
                         && reg_convrate <= 0x0A) {
                                kind = adt7461;
                        }
                } else
                if (man_id == 0x4D) { /* Maxim */
                        /*
                         * The Maxim variants do NOT have a chip_id register.
                         * Reading from that address will return the last read
                         * value, which in our case is those of the man_id
                         * register. Likewise, the config1 register seems to
                         * lack a low nibble, so the value will be those of the
                         * previous read, so in our case those of the man_id
                         * register.
                         */
                        if (chip_id == man_id
                         && (reg_config1 & 0x1F) == (man_id & 0x0F)
                         && reg_convrate <= 0x09) {
                                kind = max6657;
                        }
                }

                if (kind <= 0) { /* identification failed */
                        dev_info(&adapter->dev,
                            "Unsupported chip (man_id=0x%02X, "
                            "chip_id=0x%02X).\n", man_id, chip_id);
                        goto exit_free;
                }
        }

        if (kind == lm90) {
                name = "lm90";
        } else if (kind == adm1032) {
                name = "adm1032";
        } else if (kind == lm99) {
                name = "lm99";
        } else if (kind == lm86) {
                name = "lm86";
        } else if (kind == max6657) {
                name = "max6657";
        } else if (kind == adt7461) {
                name = "adt7461";
        }

        /* We can fill in the remaining client fields */
        strlcpy(new_client->name, name, I2C_NAME_SIZE);
        data->valid = 0;
        data->kind = kind;
        init_MUTEX(&data->update_lock);

        /* Tell the I2C layer a new client has arrived */
        if ((err = i2c_attach_client(new_client)))
                goto exit_free;

        /* Initialize the LM90 chip */
        lm90_init_client(new_client);

        /* Register sysfs hooks */
        data->class_dev = hwmon_device_register(&new_client->dev);
        if (IS_ERR(data->class_dev)) {
                err = PTR_ERR(data->class_dev);
                goto exit_detach;
        }

        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp1_input.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp2_input.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp1_min.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp2_min.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp1_max.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp2_max.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp1_crit.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp2_crit.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp1_crit_hyst.dev_attr);
        device_create_file(&new_client->dev,
                           &sensor_dev_attr_temp2_crit_hyst.dev_attr);
        device_create_file(&new_client->dev, &dev_attr_alarms);

        return 0;

exit_detach:
        i2c_detach_client(new_client);
exit_free:
        kfree(data);
exit:
        return err;
}

static void lm90_init_client(struct i2c_client *client)
{
        u8 config;

        /*
         * Start the conversions.
         */
        i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
                                  5); /* 2 Hz */
        config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
        if (config & 0x40)
                i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
                                          config & 0xBF); /* run */
}

static int lm90_detach_client(struct i2c_client *client)
{
        struct lm90_data *data = i2c_get_clientdata(client);
        int err;

        hwmon_device_unregister(data->class_dev);

        if ((err = i2c_detach_client(client)))
                return err;

        kfree(data);
        return 0;
}

static struct lm90_data *lm90_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct lm90_data *data = i2c_get_clientdata(client);

        down(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
                u8 oldh, newh;

                dev_dbg(&client->dev, "Updating lm90 data.\n");
                data->temp8[0] = i2c_smbus_read_byte_data(client,
                                 LM90_REG_R_LOCAL_TEMP);
                data->temp8[1] = i2c_smbus_read_byte_data(client,
                                 LM90_REG_R_LOCAL_LOW);
                data->temp8[2] = i2c_smbus_read_byte_data(client,
                                 LM90_REG_R_LOCAL_HIGH);
                data->temp8[3] = i2c_smbus_read_byte_data(client,
                                 LM90_REG_R_LOCAL_CRIT);
                data->temp8[4] = i2c_smbus_read_byte_data(client,
                                 LM90_REG_R_REMOTE_CRIT);
                data->temp_hyst = i2c_smbus_read_byte_data(client,
                                  LM90_REG_R_TCRIT_HYST);

                /*
                 * There is a trick here. We have to read two registers to
                 * have the remote sensor temperature, but we have to beware
                 * a conversion could occur inbetween the readings. The
                 * datasheet says we should either use the one-shot
                 * conversion register, which we don't want to do (disables
                 * hardware monitoring) or monitor the busy bit, which is
                 * impossible (we can't read the values and monitor that bit
                 * at the exact same time). So the solution used here is to
                 * read the high byte once, then the low byte, then the high
                 * byte again. If the new high byte matches the old one,
                 * then we have a valid reading. Else we have to read the low
                 * byte again, and now we believe we have a correct reading.
                 */
                oldh = i2c_smbus_read_byte_data(client,
                       LM90_REG_R_REMOTE_TEMPH);
                data->temp11[0] = i2c_smbus_read_byte_data(client,
                                  LM90_REG_R_REMOTE_TEMPL);
                newh = i2c_smbus_read_byte_data(client,
                       LM90_REG_R_REMOTE_TEMPH);
                if (newh != oldh) {
                        data->temp11[0] = i2c_smbus_read_byte_data(client,
                                          LM90_REG_R_REMOTE_TEMPL);
#ifdef DEBUG
                        oldh = i2c_smbus_read_byte_data(client,
                               LM90_REG_R_REMOTE_TEMPH);
                        /* oldh is actually newer */
                        if (newh != oldh)
                                dev_warn(&client->dev, "Remote temperature may be "
                                         "wrong.\n");
#endif
                }
                data->temp11[0] |= (newh << 8);

                data->temp11[1] = (i2c_smbus_read_byte_data(client,
                                   LM90_REG_R_REMOTE_LOWH) << 8) +
                                   i2c_smbus_read_byte_data(client,
                                   LM90_REG_R_REMOTE_LOWL);
                data->temp11[2] = (i2c_smbus_read_byte_data(client,
                                   LM90_REG_R_REMOTE_HIGHH) << 8) +
                                   i2c_smbus_read_byte_data(client,
                                   LM90_REG_R_REMOTE_HIGHL);
                data->alarms = i2c_smbus_read_byte_data(client,
                               LM90_REG_R_STATUS);

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

        up(&data->update_lock);

        return data;
}

static int __init sensors_lm90_init(void)
{
        return i2c_add_driver(&lm90_driver);
}

static void __exit sensors_lm90_exit(void)
{
        i2c_del_driver(&lm90_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM90/ADM1032 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm90_init);
module_exit(sensors_lm90_exit);