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adm9240.c

/*
 * adm9240.c      Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 *
 * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
 *                Philip Edelbrock <phil@netroedge.com>
 * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
 * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable
 *                      guidance from Jean Delvare
 *
 * Driver supports      Analog Devices          ADM9240
 *                Dallas Semiconductor    DS1780
 *                National Semiconductor  LM81
 *
 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
 *
 * Voltage  Six inputs are scaled by chip, VID also reported
 * Temperature    Chip temperature to 0.5'C, maximum and max_hysteris
 * Fans           2 fans, low speed alarm, automatic fan clock divider
 * Alarms   16-bit map of active alarms
 * Analog Out     0..1250 mV output
 *
 * Chassis Intrusion: clear CI latch with 'echo 1 > chassis_clear'
 *
 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
 *
 * LM81 extended temp reading not implemented
 *
 * 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/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>

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

/* Insmod parameters */
I2C_CLIENT_INSMOD_3(adm9240, ds1780, lm81);

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

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

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

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

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

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

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

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

      if (reg == 255)
            return 0;

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

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

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

static int adm9240_attach_adapter(struct i2c_adapter *adapter);
static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
static void adm9240_init_client(struct i2c_client *client);
static int adm9240_detach_client(struct i2c_client *client);
static struct adm9240_data *adm9240_update_device(struct device *dev);

/* driver data */
static struct i2c_driver adm9240_driver = {
      .driver = {
            .name = "adm9240",
      },
      .id         = I2C_DRIVERID_ADM9240,
      .attach_adapter   = adm9240_attach_adapter,
      .detach_client    = adm9240_detach_client,
};

/* per client data */
struct adm9240_data {
      enum chips type;
      struct i2c_client client;
      struct device *hwmon_dev;
      struct mutex update_lock;
      char valid;
      unsigned long last_updated_measure;
      unsigned long last_updated_config;

      u8 in[6];         /* ro in0_input */
      u8 in_max[6];           /* rw in0_max */
      u8 in_min[6];           /* rw in0_min */
      u8 fan[2];        /* ro fan1_input */
      u8 fan_min[2];          /* rw fan1_min */
      u8 fan_div[2];          /* rw fan1_div, read-only accessor */
      s16 temp;         /* ro temp1_input, 9-bit sign-extended */
      s8 temp_max[2];         /* rw 0 -> temp_max, 1 -> temp_max_hyst */
      u16 alarms;       /* ro alarms */
      u8 aout;          /* rw aout_output */
      u8 vid;                 /* ro vid */
      u8 vrm;                 /* -- vrm set on startup, no accessor */
};

/*** sysfs accessors ***/

/* temperature */
static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
            char *buf)
{
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
}

static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
            char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
}

static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
            const char *buf, size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      long val = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->temp_max[attr->index] = TEMP_TO_REG(val);
      i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
                  data->temp_max[attr->index]);
      mutex_unlock(&data->update_lock);
      return count;
}

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
            show_max, set_max, 0);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
            show_max, set_max, 1);

/* voltage */
static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
            char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
                        attr->index));
}

static ssize_t show_in_min(struct device *dev,
            struct device_attribute *devattr, char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
                        attr->index));
}

static ssize_t show_in_max(struct device *dev,
            struct device_attribute *devattr, char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
                        attr->index));
}

static ssize_t set_in_min(struct device *dev,
            struct device_attribute *devattr,
            const char *buf, size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      unsigned long val = simple_strtoul(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->in_min[attr->index] = IN_TO_REG(val, attr->index);
      i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
                  data->in_min[attr->index]);
      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t set_in_max(struct device *dev,
            struct device_attribute *devattr,
            const char *buf, size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      unsigned long val = simple_strtoul(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->in_max[attr->index] = IN_TO_REG(val, attr->index);
      i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
                  data->in_max[attr->index]);
      mutex_unlock(&data->update_lock);
      return count;
}

#define vin(nr)                                       \
static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO,          \
            show_in, NULL, nr);                       \
static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR,  \
            show_in_min, set_in_min, nr);             \
static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR,  \
            show_in_max, set_in_max, nr);

vin(0);
vin(1);
vin(2);
vin(3);
vin(4);
vin(5);

/* fans */
static ssize_t show_fan(struct device *dev,
            struct device_attribute *devattr, char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
                        1 << data->fan_div[attr->index]));
}

static ssize_t show_fan_min(struct device *dev,
            struct device_attribute *devattr, char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
                        1 << data->fan_div[attr->index]));
}

static ssize_t show_fan_div(struct device *dev,
            struct device_attribute *devattr, char *buf)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
}

/* write new fan div, callers must hold data->update_lock */
static void adm9240_write_fan_div(struct i2c_client *client, int nr,
            u8 fan_div)
{
      u8 reg, old, shift = (nr + 2) * 2;

      reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
      old = (reg >> shift) & 3;
      reg &= ~(3 << shift);
      reg |= (fan_div << shift);
      i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
      dev_dbg(&client->dev, "fan%d clock divider changed from %u "
                  "to %u\n", nr + 1, 1 << old, 1 << fan_div);
}

/*
 * set fan speed low limit:
 *
 * - value is zero: disable fan speed low limit alarm
 *
 * - value is below fan speed measurement range: enable fan speed low
 *   limit alarm to be asserted while fan speed too slow to measure
 *
 * - otherwise: select fan clock divider to suit fan speed low limit,
 *   measurement code may adjust registers to ensure fan speed reading
 */
static ssize_t set_fan_min(struct device *dev,
            struct device_attribute *devattr,
            const char *buf, size_t count)
{
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      unsigned long val = simple_strtoul(buf, NULL, 10);
      int nr = attr->index;
      u8 new_div;

      mutex_lock(&data->update_lock);

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

            dev_dbg(&client->dev, "fan%u low limit set disabled\n",
                        nr + 1);

      } else if (val < 1350000 / (8 * 254)) {
            new_div = 3;
            data->fan_min[nr] = 254;

            dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
                        nr + 1, FAN_FROM_REG(254, 1 << new_div));

      } else {
            unsigned int new_min = 1350000 / val;

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

            data->fan_min[nr] = new_min;

            dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
                        nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
      }

      if (new_div != data->fan_div[nr]) {
            data->fan_div[nr] = new_div;
            adm9240_write_fan_div(client, nr, new_div);
      }
      i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
                  data->fan_min[nr]);

      mutex_unlock(&data->update_lock);
      return count;
}

#define fan(nr)                                       \
static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO,         \
            show_fan, NULL, nr - 1);                  \
static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO,           \
            show_fan_div, NULL, nr - 1);              \
static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
            show_fan_min, set_fan_min, nr - 1);

fan(1);
fan(2);

/* alarms */
static ssize_t show_alarms(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/* vid */
static ssize_t show_vid(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

/* analog output */
static ssize_t show_aout(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct adm9240_data *data = adm9240_update_device(dev);
      return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
}

static ssize_t set_aout(struct device *dev,
            struct device_attribute *attr,
            const char *buf, size_t count)
{
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      unsigned long val = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->aout = AOUT_TO_REG(val);
      i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
      mutex_unlock(&data->update_lock);
      return count;
}
static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);

/* chassis_clear */
static ssize_t chassis_clear(struct device *dev,
            struct device_attribute *attr,
            const char *buf, size_t count)
{
      struct i2c_client *client = to_i2c_client(dev);
      unsigned long val = simple_strtol(buf, NULL, 10);

      if (val == 1) {
            i2c_smbus_write_byte_data(client,
                        ADM9240_REG_CHASSIS_CLEAR, 0x80);
            dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
      }
      return count;
}
static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);

static struct attribute *adm9240_attributes[] = {
      &sensor_dev_attr_in0_input.dev_attr.attr,
      &sensor_dev_attr_in0_min.dev_attr.attr,
      &sensor_dev_attr_in0_max.dev_attr.attr,
      &sensor_dev_attr_in1_input.dev_attr.attr,
      &sensor_dev_attr_in1_min.dev_attr.attr,
      &sensor_dev_attr_in1_max.dev_attr.attr,
      &sensor_dev_attr_in2_input.dev_attr.attr,
      &sensor_dev_attr_in2_min.dev_attr.attr,
      &sensor_dev_attr_in2_max.dev_attr.attr,
      &sensor_dev_attr_in3_input.dev_attr.attr,
      &sensor_dev_attr_in3_min.dev_attr.attr,
      &sensor_dev_attr_in3_max.dev_attr.attr,
      &sensor_dev_attr_in4_input.dev_attr.attr,
      &sensor_dev_attr_in4_min.dev_attr.attr,
      &sensor_dev_attr_in4_max.dev_attr.attr,
      &sensor_dev_attr_in5_input.dev_attr.attr,
      &sensor_dev_attr_in5_min.dev_attr.attr,
      &sensor_dev_attr_in5_max.dev_attr.attr,
      &dev_attr_temp1_input.attr,
      &sensor_dev_attr_temp1_max.dev_attr.attr,
      &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
      &sensor_dev_attr_fan1_input.dev_attr.attr,
      &sensor_dev_attr_fan1_div.dev_attr.attr,
      &sensor_dev_attr_fan1_min.dev_attr.attr,
      &sensor_dev_attr_fan2_input.dev_attr.attr,
      &sensor_dev_attr_fan2_div.dev_attr.attr,
      &sensor_dev_attr_fan2_min.dev_attr.attr,
      &dev_attr_alarms.attr,
      &dev_attr_aout_output.attr,
      &dev_attr_chassis_clear.attr,
      &dev_attr_cpu0_vid.attr,
      NULL
};

static const struct attribute_group adm9240_group = {
      .attrs = adm9240_attributes,
};


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

static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
{
      struct i2c_client *new_client;
      struct adm9240_data *data;
      int err = 0;
      const char *name = "";
      u8 man_id, die_rev;

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

      if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) {
            err = -ENOMEM;
            goto exit;
      }

      new_client = &data->client;
      i2c_set_clientdata(new_client, data);
      new_client->addr = address;
      new_client->adapter = adapter;
      new_client->driver = &adm9240_driver;
      new_client->flags = 0;

      if (kind == 0) {
            kind = adm9240;
      }

      if (kind < 0) {

            /* verify chip: reg address should match i2c address */
            if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
                        != address) {
                  dev_err(&adapter->dev, "detect fail: address match, "
                              "0x%02x\n", address);
                  goto exit_free;
            }

            /* check known chip manufacturer */
            man_id = i2c_smbus_read_byte_data(new_client,
                        ADM9240_REG_MAN_ID);
            if (man_id == 0x23) {
                  kind = adm9240;
            } else if (man_id == 0xda) {
                  kind = ds1780;
            } else if (man_id == 0x01) {
                  kind = lm81;
            } else {
                  dev_err(&adapter->dev, "detect fail: unknown manuf, "
                              "0x%02x\n", man_id);
                  goto exit_free;
            }

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

      /* either forced or detected chip kind */
      if (kind == adm9240) {
            name = "adm9240";
      } else if (kind == ds1780) {
            name = "ds1780";
      } else if (kind == lm81) {
            name = "lm81";
      }

      /* fill in the remaining client fields and attach */
      strlcpy(new_client->name, name, I2C_NAME_SIZE);
      data->type = kind;
      mutex_init(&data->update_lock);

      if ((err = i2c_attach_client(new_client)))
            goto exit_free;

      adm9240_init_client(new_client);

      /* populate sysfs filesystem */
      if ((err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group)))
            goto exit_detach;

      data->hwmon_dev = hwmon_device_register(&new_client->dev);
      if (IS_ERR(data->hwmon_dev)) {
            err = PTR_ERR(data->hwmon_dev);
            goto exit_remove;
      }

      return 0;

exit_remove:
      sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
exit_detach:
      i2c_detach_client(new_client);
exit_free:
      kfree(data);
exit:
      return err;
}

static int adm9240_attach_adapter(struct i2c_adapter *adapter)
{
      if (!(adapter->class & I2C_CLASS_HWMON))
            return 0;
      return i2c_probe(adapter, &addr_data, adm9240_detect);
}

static int adm9240_detach_client(struct i2c_client *client)
{
      struct adm9240_data *data = i2c_get_clientdata(client);
      int err;

      hwmon_device_unregister(data->hwmon_dev);
      sysfs_remove_group(&client->dev.kobj, &adm9240_group);

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

      kfree(data);
      return 0;
}

static void adm9240_init_client(struct i2c_client *client)
{
      struct adm9240_data *data = i2c_get_clientdata(client);
      u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
      u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;

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

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

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

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

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

            for (i = 0; i < 6; i++)
            {
                  i2c_smbus_write_byte_data(client,
                              ADM9240_REG_IN_MIN(i), 0);
                  i2c_smbus_write_byte_data(client,
                              ADM9240_REG_IN_MAX(i), 255);
            }
            i2c_smbus_write_byte_data(client,
                        ADM9240_REG_FAN_MIN(0), 255);
            i2c_smbus_write_byte_data(client,
                        ADM9240_REG_FAN_MIN(1), 255);
            i2c_smbus_write_byte_data(client,
                        ADM9240_REG_TEMP_MAX(0), 127);
            i2c_smbus_write_byte_data(client,
                        ADM9240_REG_TEMP_MAX(1), 127);

            /* start measurement cycle */
            i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);

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

static struct adm9240_data *adm9240_update_device(struct device *dev)
{
      struct i2c_client *client = to_i2c_client(dev);
      struct adm9240_data *data = i2c_get_clientdata(client);
      int i;

      mutex_lock(&data->update_lock);

      /* minimum measurement cycle: 1.75 seconds */
      if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
                  || !data->valid) {

            for (i = 0; i < 6; i++) /* read voltages */
            {
                  data->in[i] = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_IN(i));
            }
            data->alarms = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_INT(0)) |
                              i2c_smbus_read_byte_data(client,
                              ADM9240_REG_INT(1)) << 8;

            /* read temperature: assume temperature changes less than
             * 0.5'C per two measurement cycles thus ignore possible
             * but unlikely aliasing error on lsb reading. --Grant */
            data->temp = ((i2c_smbus_read_byte_data(client,
                              ADM9240_REG_TEMP) << 8) |
                              i2c_smbus_read_byte_data(client,
                              ADM9240_REG_TEMP_CONF)) / 128;

            for (i = 0; i < 2; i++) /* read fans */
            {
                  data->fan[i] = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_FAN(i));

                  /* adjust fan clock divider on overflow */
                  if (data->valid && data->fan[i] == 255 &&
                              data->fan_div[i] < 3) {

                        adm9240_write_fan_div(client, i,
                                    ++data->fan_div[i]);

                        /* adjust fan_min if active, but not to 0 */
                        if (data->fan_min[i] < 255 &&
                                    data->fan_min[i] >= 2)
                              data->fan_min[i] /= 2;
                  }
            }
            data->last_updated_measure = jiffies;
      }

      /* minimum config reading cycle: 300 seconds */
      if (time_after(jiffies, data->last_updated_config + (HZ * 300))
                  || !data->valid) {

            for (i = 0; i < 6; i++)
            {
                  data->in_min[i] = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_IN_MIN(i));
                  data->in_max[i] = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_IN_MAX(i));
            }
            for (i = 0; i < 2; i++)
            {
                  data->fan_min[i] = i2c_smbus_read_byte_data(client,
                              ADM9240_REG_FAN_MIN(i));
            }
            data->temp_max[0] = i2c_smbus_read_byte_data(client,
                        ADM9240_REG_TEMP_MAX(0));
            data->temp_max[1] = i2c_smbus_read_byte_data(client,
                        ADM9240_REG_TEMP_MAX(1));

            /* read fan divs and 5-bit VID */
            i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
            data->fan_div[0] = (i >> 4) & 3;
            data->fan_div[1] = (i >> 6) & 3;
            data->vid = i & 0x0f;
            data->vid |= (i2c_smbus_read_byte_data(client,
                              ADM9240_REG_VID4) & 1) << 4;
            /* read analog out */
            data->aout = i2c_smbus_read_byte_data(client,
                        ADM9240_REG_ANALOG_OUT);

            data->last_updated_config = jiffies;
            data->valid = 1;
      }
      mutex_unlock(&data->update_lock);
      return data;
}

static int __init sensors_adm9240_init(void)
{
      return i2c_add_driver(&adm9240_driver);
}

static void __exit sensors_adm9240_exit(void)
{
      i2c_del_driver(&adm9240_driver);
}

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

module_init(sensors_adm9240_init);
module_exit(sensors_adm9240_exit);


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