fschmd.c

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/*
 * fschmd.c
 *
 * Copyright (C) 2007 - 2009 Hans de Goede <[email protected]>
 *
 * 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.
 */

/*
 *  Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
 *  Scylla, Heracles, Heimdall, Hades and Syleus chips
 *
 *  Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
 *  (candidate) fschmd drivers:
 *  Copyright (C) 2006 Thilo Cestonaro
 *          <[email protected]>
 *  Copyright (C) 2004, 2005 Stefan Ott <[email protected]>
 *  Copyright (C) 2003, 2004 Reinhard Nissl <[email protected]>
 *  Copyright (c) 2001 Martin Knoblauch <[email protected], [email protected]>
 *  Copyright (C) 2000 Hermann Jung <[email protected]>
 */

#include <linux/module.h>
#include <linux/init.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>
#include <linux/dmi.h>
#include <linux/fs.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/kref.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

/* Insmod parameters */
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
    __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl };

/*
 * The FSCHMD registers and other defines
 */

/* chip identification */
#define FSCHMD_REG_IDENT_0      0x00
#define FSCHMD_REG_IDENT_1      0x01
#define FSCHMD_REG_IDENT_2      0x02
#define FSCHMD_REG_REVISION     0x03

/* global control and status */
#define FSCHMD_REG_EVENT_STATE      0x04
#define FSCHMD_REG_CONTROL      0x05

#define FSCHMD_CONTROL_ALERT_LED    0x01

/* watchdog */
static const u8 FSCHMD_REG_WDOG_CONTROL[7] = {
    0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
static const u8 FSCHMD_REG_WDOG_STATE[7] = {
    0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
static const u8 FSCHMD_REG_WDOG_PRESET[7] = {
    0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };

#define FSCHMD_WDOG_CONTROL_TRIGGER 0x10
#define FSCHMD_WDOG_CONTROL_STARTED 0x10 /* the same as trigger */
#define FSCHMD_WDOG_CONTROL_STOP    0x20
#define FSCHMD_WDOG_CONTROL_RESOLUTION  0x40

#define FSCHMD_WDOG_STATE_CARDRESET 0x02

/* voltages, weird order is to keep the same order as the old drivers */
static const u8 FSCHMD_REG_VOLT[7][6] = {
    { 0x45, 0x42, 0x48 },               /* pos */
    { 0x45, 0x42, 0x48 },               /* her */
    { 0x45, 0x42, 0x48 },               /* scy */
    { 0x45, 0x42, 0x48 },               /* hrc */
    { 0x45, 0x42, 0x48 },               /* hmd */
    { 0x21, 0x20, 0x22 },               /* hds */
    { 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 },     /* syl */
};

static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };

/*
 * minimum pwm at which the fan is driven (pwm can by increased depending on
 * the temp. Notice that for the scy some fans share there minimum speed.
 * Also notice that with the scy the sensor order is different than with the
 * other chips, this order was in the 2.4 driver and kept for consistency.
 */
static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
    { 0x55, 0x65 },                 /* pos */
    { 0x55, 0x65, 0xb5 },               /* her */
    { 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 },     /* scy */
    { 0x55, 0x65, 0xa5, 0xb5 },         /* hrc */
    { 0x55, 0x65, 0xa5, 0xb5, 0xc5 },       /* hmd */
    { 0x55, 0x65, 0xa5, 0xb5, 0xc5 },       /* hds */
    { 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 },   /* syl */
};

/* actual fan speed */
static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
    { 0x0e, 0x6b, 0xab },               /* pos */
    { 0x0e, 0x6b, 0xbb },               /* her */
    { 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb },     /* scy */
    { 0x0e, 0x6b, 0xab, 0xbb },         /* hrc */
    { 0x5b, 0x6b, 0xab, 0xbb, 0xcb },       /* hmd */
    { 0x5b, 0x6b, 0xab, 0xbb, 0xcb },       /* hds */
    { 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 },   /* syl */
};

/* fan status registers */
static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
    { 0x0d, 0x62, 0xa2 },               /* pos */
    { 0x0d, 0x62, 0xb2 },               /* her */
    { 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 },     /* scy */
    { 0x0d, 0x62, 0xa2, 0xb2 },         /* hrc */
    { 0x52, 0x62, 0xa2, 0xb2, 0xc2 },       /* hmd */
    { 0x52, 0x62, 0xa2, 0xb2, 0xc2 },       /* hds */
    { 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 },   /* syl */
};

/* fan ripple / divider registers */
static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
    { 0x0f, 0x6f, 0xaf },               /* pos */
    { 0x0f, 0x6f, 0xbf },               /* her */
    { 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf },     /* scy */
    { 0x0f, 0x6f, 0xaf, 0xbf },         /* hrc */
    { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf },       /* hmd */
    { 0x5f, 0x6f, 0xaf, 0xbf, 0xcf },       /* hds */
    { 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 },   /* syl */
};

static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };

/* Fan status register bitmasks */
#define FSCHMD_FAN_ALARM    0x04 /* called fault by FSC! */
#define FSCHMD_FAN_NOT_PRESENT  0x08
#define FSCHMD_FAN_DISABLED 0x80


/* actual temperature registers */
static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
    { 0x64, 0x32, 0x35 },               /* pos */
    { 0x64, 0x32, 0x35 },               /* her */
    { 0x64, 0xD0, 0x32, 0x35 },         /* scy */
    { 0x64, 0x32, 0x35 },               /* hrc */
    { 0x70, 0x80, 0x90, 0xd0, 0xe0 },       /* hmd */
    { 0x70, 0x80, 0x90, 0xd0, 0xe0 },       /* hds */
    { 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8,       /* syl */
      0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
};

/* temperature state registers */
static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
    { 0x71, 0x81, 0x91 },               /* pos */
    { 0x71, 0x81, 0x91 },               /* her */
    { 0x71, 0xd1, 0x81, 0x91 },         /* scy */
    { 0x71, 0x81, 0x91 },               /* hrc */
    { 0x71, 0x81, 0x91, 0xd1, 0xe1 },       /* hmd */
    { 0x71, 0x81, 0x91, 0xd1, 0xe1 },       /* hds */
    { 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9,       /* syl */
      0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
};

/*
 * temperature high limit registers, FSC does not document these. Proven to be
 * there with field testing on the fscher and fschrc, already supported / used
 * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
 * at these addresses, but doesn't want to confirm they are the same as with
 * the fscher??
 */
static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
    { 0, 0, 0 },                    /* pos */
    { 0x76, 0x86, 0x96 },               /* her */
    { 0x76, 0xd6, 0x86, 0x96 },         /* scy */
    { 0x76, 0x86, 0x96 },               /* hrc */
    { 0x76, 0x86, 0x96, 0xd6, 0xe6 },       /* hmd */
    { 0x76, 0x86, 0x96, 0xd6, 0xe6 },       /* hds */
    { 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa,       /* syl */
      0xba, 0xca, 0xda, 0xea, 0xfa },
};

/*
 * These were found through experimenting with an fscher, currently they are
 * not used, but we keep them around for future reference.
 * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
 * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
 * the fan speed.
 * static const u8 FSCHER_REG_TEMP_AUTOP1[] =   { 0x73, 0x83, 0x93 };
 * static const u8 FSCHER_REG_TEMP_AUTOP2[] =   { 0x75, 0x85, 0x95 };
 */

static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };

/* temp status register bitmasks */
#define FSCHMD_TEMP_WORKING 0x01
#define FSCHMD_TEMP_ALERT   0x02
#define FSCHMD_TEMP_DISABLED    0x80
/* there only really is an alarm if the sensor is working and alert == 1 */
#define FSCHMD_TEMP_ALARM_MASK \
    (FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)

/*
 * Functions declarations
 */

static int fschmd_probe(struct i2c_client *client,
            const struct i2c_device_id *id);
static int fschmd_detect(struct i2c_client *client,
             struct i2c_board_info *info);
static int fschmd_remove(struct i2c_client *client);
static struct fschmd_data *fschmd_update_device(struct device *dev);

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

static const struct i2c_device_id fschmd_id[] = {
    { "fscpos", fscpos },
    { "fscher", fscher },
    { "fscscy", fscscy },
    { "fschrc", fschrc },
    { "fschmd", fschmd },
    { "fschds", fschds },
    { "fscsyl", fscsyl },
    { }
};
MODULE_DEVICE_TABLE(i2c, fschmd_id);

static struct i2c_driver fschmd_driver = {
    .class      = I2C_CLASS_HWMON,
    .driver = {
        .name   = "fschmd",
    },
    .probe      = fschmd_probe,
    .remove     = fschmd_remove,
    .id_table   = fschmd_id,
    .detect     = fschmd_detect,
    .address_list   = normal_i2c,
};

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

struct fschmd_data {
    struct i2c_client *client;
    struct device *hwmon_dev;
    struct mutex update_lock;
    struct mutex watchdog_lock;
    struct list_head list; /* member of the watchdog_data_list */
    struct kref kref;
    struct miscdevice watchdog_miscdev;
    enum chips kind;
    unsigned long watchdog_is_open;
    char watchdog_expect_close;
    char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
    char valid; /* zero until following fields are valid */
    unsigned long last_updated; /* in jiffies */

    /* register values */
    u8 revision;            /* chip revision */
    u8 global_control;  /* global control register */
    u8 watchdog_control;    /* watchdog control register */
    u8 watchdog_state;      /* watchdog status register */
    u8 watchdog_preset;     /* watchdog counter preset on trigger val */
    u8 volt[6];     /* voltage */
    u8 temp_act[11];    /* temperature */
    u8 temp_status[11]; /* status of sensor */
    u8 temp_max[11];    /* high temp limit, notice: undocumented! */
    u8 fan_act[7];      /* fans revolutions per second */
    u8 fan_status[7];   /* fan status */
    u8 fan_min[7];      /* fan min value for rps */
    u8 fan_ripple[7];   /* divider for rps */
};

/*
 * Global variables to hold information read from special DMI tables, which are
 * available on FSC machines with an fscher or later chip. There is no need to
 * protect these with a lock as they are only modified from our attach function
 * which always gets called with the i2c-core lock held and never accessed
 * before the attach function is done with them.
 */
static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
static int dmi_vref = -1;

/*
 * Somewhat ugly :( global data pointer list with all fschmd devices, so that
 * we can find our device data as when using misc_register there is no other
 * method to get to ones device data from the open fop.
 */
static LIST_HEAD(watchdog_data_list);
/* Note this lock not only protect list access, but also data.kref access */
static DEFINE_MUTEX(watchdog_data_mutex);

/*
 * Release our data struct when we're detached from the i2c client *and* all
 * references to our watchdog device are released
 */
static void fschmd_release_resources(struct kref *ref)
{
    struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
    kfree(data);
}

/*
 * Sysfs attr show / store functions
 */

static ssize_t show_in_value(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    const int max_reading[3] = { 14200, 6600, 3300 };
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    if (data->kind == fscher || data->kind >= fschrc)
        return sprintf(buf, "%d\n", (data->volt[index] * dmi_vref *
            dmi_mult[index]) / 255 + dmi_offset[index]);
    else
        return sprintf(buf, "%d\n", (data->volt[index] *
            max_reading[index] + 128) / 255);
}


#define TEMP_FROM_REG(val)  (((val) - 128) * 1000)

static ssize_t show_temp_value(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[index]));
}

static ssize_t show_temp_max(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
}

static ssize_t store_temp_max(struct device *dev, struct device_attribute
    *devattr, const char *buf, size_t count)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = dev_get_drvdata(dev);
    long v;
    int err;

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

    v = SENSORS_LIMIT(v / 1000, -128, 127) + 128;

    mutex_lock(&data->update_lock);
    i2c_smbus_write_byte_data(to_i2c_client(dev),
        FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
    data->temp_max[index] = v;
    mutex_unlock(&data->update_lock);

    return count;
}

static ssize_t show_temp_fault(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    /* bit 0 set means sensor working ok, so no fault! */
    if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
        return sprintf(buf, "0\n");
    else
        return sprintf(buf, "1\n");
}

static ssize_t show_temp_alarm(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
            FSCHMD_TEMP_ALARM_MASK)
        return sprintf(buf, "1\n");
    else
        return sprintf(buf, "0\n");
}


#define RPM_FROM_REG(val)   ((val) * 60)

static ssize_t show_fan_value(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[index]));
}

static ssize_t show_fan_div(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    /* bits 2..7 reserved => mask with 3 */
    return sprintf(buf, "%d\n", 1 << (data->fan_ripple[index] & 3));
}

static ssize_t store_fan_div(struct device *dev, struct device_attribute
    *devattr, const char *buf, size_t count)
{
    u8 reg;
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = dev_get_drvdata(dev);
    /* supported values: 2, 4, 8 */
    unsigned long v;
    int err;

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

    switch (v) {
    case 2:
        v = 1;
        break;
    case 4:
        v = 2;
        break;
    case 8:
        v = 3;
        break;
    default:
        dev_err(dev, "fan_div value %lu not supported. "
            "Choose one of 2, 4 or 8!\n", v);
        return -EINVAL;
    }

    mutex_lock(&data->update_lock);

    reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
        FSCHMD_REG_FAN_RIPPLE[data->kind][index]);

    /* bits 2..7 reserved => mask with 0x03 */
    reg &= ~0x03;
    reg |= v;

    i2c_smbus_write_byte_data(to_i2c_client(dev),
        FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);

    data->fan_ripple[index] = reg;

    mutex_unlock(&data->update_lock);

    return count;
}

static ssize_t show_fan_alarm(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    if (data->fan_status[index] & FSCHMD_FAN_ALARM)
        return sprintf(buf, "1\n");
    else
        return sprintf(buf, "0\n");
}

static ssize_t show_fan_fault(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);

    if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
        return sprintf(buf, "1\n");
    else
        return sprintf(buf, "0\n");
}


static ssize_t show_pwm_auto_point1_pwm(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = fschmd_update_device(dev);
    int val = data->fan_min[index];

    /* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
    if (val || data->kind == fscsyl)
        val = val / 2 + 128;

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

static ssize_t store_pwm_auto_point1_pwm(struct device *dev,
    struct device_attribute *devattr, const char *buf, size_t count)
{
    int index = to_sensor_dev_attr(devattr)->index;
    struct fschmd_data *data = dev_get_drvdata(dev);
    unsigned long v;
    int err;

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

    /* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
    if (v || data->kind == fscsyl) {
        v = SENSORS_LIMIT(v, 128, 255);
        v = (v - 128) * 2 + 1;
    }

    mutex_lock(&data->update_lock);

    i2c_smbus_write_byte_data(to_i2c_client(dev),
        FSCHMD_REG_FAN_MIN[data->kind][index], v);
    data->fan_min[index] = v;

    mutex_unlock(&data->update_lock);

    return count;
}


/*
 * The FSC hwmon family has the ability to force an attached alert led to flash
 * from software, we export this as an alert_led sysfs attr
 */
static ssize_t show_alert_led(struct device *dev,
    struct device_attribute *devattr, char *buf)
{
    struct fschmd_data *data = fschmd_update_device(dev);

    if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
        return sprintf(buf, "1\n");
    else
        return sprintf(buf, "0\n");
}

static ssize_t store_alert_led(struct device *dev,
    struct device_attribute *devattr, const char *buf, size_t count)
{
    u8 reg;
    struct fschmd_data *data = dev_get_drvdata(dev);
    unsigned long v;
    int err;

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

    mutex_lock(&data->update_lock);

    reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);

    if (v)
        reg |= FSCHMD_CONTROL_ALERT_LED;
    else
        reg &= ~FSCHMD_CONTROL_ALERT_LED;

    i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);

    data->global_control = reg;

    mutex_unlock(&data->update_lock);

    return count;
}

static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);

static struct sensor_device_attribute fschmd_attr[] = {
    SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0),
    SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1),
    SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2),
    SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3),
    SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4),
    SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5),
};

static struct sensor_device_attribute fschmd_temp_attr[] = {
    SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
    SENSOR_ATTR(temp1_max,   0644, show_temp_max, store_temp_max, 0),
    SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0),
    SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0),
    SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
    SENSOR_ATTR(temp2_max,   0644, show_temp_max, store_temp_max, 1),
    SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1),
    SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1),
    SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2),
    SENSOR_ATTR(temp3_max,   0644, show_temp_max, store_temp_max, 2),
    SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2),
    SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2),
    SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3),
    SENSOR_ATTR(temp4_max,   0644, show_temp_max, store_temp_max, 3),
    SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3),
    SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3),
    SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4),
    SENSOR_ATTR(temp5_max,   0644, show_temp_max, store_temp_max, 4),
    SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4),
    SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4),
    SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5),
    SENSOR_ATTR(temp6_max,   0644, show_temp_max, store_temp_max, 5),
    SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5),
    SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5),
    SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6),
    SENSOR_ATTR(temp7_max,   0644, show_temp_max, store_temp_max, 6),
    SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6),
    SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6),
    SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7),
    SENSOR_ATTR(temp8_max,   0644, show_temp_max, store_temp_max, 7),
    SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7),
    SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7),
    SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8),
    SENSOR_ATTR(temp9_max,   0644, show_temp_max, store_temp_max, 8),
    SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8),
    SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8),
    SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9),
    SENSOR_ATTR(temp10_max,   0644, show_temp_max, store_temp_max, 9),
    SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9),
    SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9),
    SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10),
    SENSOR_ATTR(temp11_max,   0644, show_temp_max, store_temp_max, 10),
    SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10),
    SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10),
};

static struct sensor_device_attribute fschmd_fan_attr[] = {
    SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0),
    SENSOR_ATTR(fan1_div,   0644, show_fan_div, store_fan_div, 0),
    SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0),
    SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0),
    SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 0),
    SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1),
    SENSOR_ATTR(fan2_div,   0644, show_fan_div, store_fan_div, 1),
    SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1),
    SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1),
    SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 1),
    SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2),
    SENSOR_ATTR(fan3_div,   0644, show_fan_div, store_fan_div, 2),
    SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2),
    SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2),
    SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 2),
    SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3),
    SENSOR_ATTR(fan4_div,   0644, show_fan_div, store_fan_div, 3),
    SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3),
    SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3),
    SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 3),
    SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4),
    SENSOR_ATTR(fan5_div,   0644, show_fan_div, store_fan_div, 4),
    SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4),
    SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4),
    SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 4),
    SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5),
    SENSOR_ATTR(fan6_div,   0644, show_fan_div, store_fan_div, 5),
    SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5),
    SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5),
    SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 5),
    SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6),
    SENSOR_ATTR(fan7_div,   0644, show_fan_div, store_fan_div, 6),
    SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6),
    SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6),
    SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
        store_pwm_auto_point1_pwm, 6),
};


/*
 * Watchdog routines
 */

static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
{
    int ret, resolution;
    int kind = data->kind + 1; /* 0-x array index -> 1-x module param */

    /* 2 second or 60 second resolution? */
    if (timeout <= 510 || kind == fscpos || kind == fscscy)
        resolution = 2;
    else
        resolution = 60;

    if (timeout < resolution || timeout > (resolution * 255))
        return -EINVAL;

    mutex_lock(&data->watchdog_lock);
    if (!data->client) {
        ret = -ENODEV;
        goto leave;
    }

    if (resolution == 2)
        data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
    else
        data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;

    data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);

    /* Write new timeout value */
    i2c_smbus_write_byte_data(data->client,
        FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
    /* Write new control register, do not trigger! */
    i2c_smbus_write_byte_data(data->client,
        FSCHMD_REG_WDOG_CONTROL[data->kind],
        data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);

    ret = data->watchdog_preset * resolution;

leave:
    mutex_unlock(&data->watchdog_lock);
    return ret;
}

static int watchdog_get_timeout(struct fschmd_data *data)
{
    int timeout;

    mutex_lock(&data->watchdog_lock);
    if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
        timeout = data->watchdog_preset * 60;
    else
        timeout = data->watchdog_preset * 2;
    mutex_unlock(&data->watchdog_lock);

    return timeout;
}

static int watchdog_trigger(struct fschmd_data *data)
{
    int ret = 0;

    mutex_lock(&data->watchdog_lock);
    if (!data->client) {
        ret = -ENODEV;
        goto leave;
    }

    data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
    i2c_smbus_write_byte_data(data->client,
                  FSCHMD_REG_WDOG_CONTROL[data->kind],
                  data->watchdog_control);
leave:
    mutex_unlock(&data->watchdog_lock);
    return ret;
}

static int watchdog_stop(struct fschmd_data *data)
{
    int ret = 0;

    mutex_lock(&data->watchdog_lock);
    if (!data->client) {
        ret = -ENODEV;
        goto leave;
    }

    data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
    /*
     * Don't store the stop flag in our watchdog control register copy, as
     * its a write only bit (read always returns 0)
     */
    i2c_smbus_write_byte_data(data->client,
        FSCHMD_REG_WDOG_CONTROL[data->kind],
        data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
leave:
    mutex_unlock(&data->watchdog_lock);
    return ret;
}

static int watchdog_open(struct inode *inode, struct file *filp)
{
    struct fschmd_data *pos, *data = NULL;
    int watchdog_is_open;

    /*
     * We get called from drivers/char/misc.c with misc_mtx hold, and we
     * call misc_register() from fschmd_probe() with watchdog_data_mutex
     * hold, as misc_register() takes the misc_mtx lock, this is a possible
     * deadlock, so we use mutex_trylock here.
     */
    if (!mutex_trylock(&watchdog_data_mutex))
        return -ERESTARTSYS;
    list_for_each_entry(pos, &watchdog_data_list, list) {
        if (pos->watchdog_miscdev.minor == iminor(inode)) {
            data = pos;
            break;
        }
    }
    /* Note we can never not have found data, so we don't check for this */
    watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
    if (!watchdog_is_open)
        kref_get(&data->kref);
    mutex_unlock(&watchdog_data_mutex);

    if (watchdog_is_open)
        return -EBUSY;

    /* Start the watchdog */
    watchdog_trigger(data);
    filp->private_data = data;

    return nonseekable_open(inode, filp);
}

static int watchdog_release(struct inode *inode, struct file *filp)
{
    struct fschmd_data *data = filp->private_data;

    if (data->watchdog_expect_close) {
        watchdog_stop(data);
        data->watchdog_expect_close = 0;
    } else {
        watchdog_trigger(data);
        dev_crit(&data->client->dev,
            "unexpected close, not stopping watchdog!\n");
    }

    clear_bit(0, &data->watchdog_is_open);

    mutex_lock(&watchdog_data_mutex);
    kref_put(&data->kref, fschmd_release_resources);
    mutex_unlock(&watchdog_data_mutex);

    return 0;
}

static ssize_t watchdog_write(struct file *filp, const char __user *buf,
    size_t count, loff_t *offset)
{
    int ret;
    struct fschmd_data *data = filp->private_data;

    if (count) {
        if (!nowayout) {
            size_t i;

            /* Clear it in case it was set with a previous write */
            data->watchdog_expect_close = 0;

            for (i = 0; i != count; i++) {
                char c;
                if (get_user(c, buf + i))
                    return -EFAULT;
                if (c == 'V')
                    data->watchdog_expect_close = 1;
            }
        }
        ret = watchdog_trigger(data);
        if (ret < 0)
            return ret;
    }
    return count;
}

static long watchdog_ioctl(struct file *filp, unsigned int cmd,
               unsigned long arg)
{
    struct watchdog_info ident = {
        .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
                WDIOF_CARDRESET,
        .identity = "FSC watchdog"
    };
    int i, ret = 0;
    struct fschmd_data *data = filp->private_data;

    switch (cmd) {
    case WDIOC_GETSUPPORT:
        ident.firmware_version = data->revision;
        if (!nowayout)
            ident.options |= WDIOF_MAGICCLOSE;
        if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
            ret = -EFAULT;
        break;

    case WDIOC_GETSTATUS:
        ret = put_user(0, (int __user *)arg);
        break;

    case WDIOC_GETBOOTSTATUS:
        if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
            ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
        else
            ret = put_user(0, (int __user *)arg);
        break;

    case WDIOC_KEEPALIVE:
        ret = watchdog_trigger(data);
        break;

    case WDIOC_GETTIMEOUT:
        i = watchdog_get_timeout(data);
        ret = put_user(i, (int __user *)arg);
        break;

    case WDIOC_SETTIMEOUT:
        if (get_user(i, (int __user *)arg)) {
            ret = -EFAULT;
            break;
        }
        ret = watchdog_set_timeout(data, i);
        if (ret > 0)
            ret = put_user(ret, (int __user *)arg);
        break;

    case WDIOC_SETOPTIONS:
        if (get_user(i, (int __user *)arg)) {
            ret = -EFAULT;
            break;
        }

        if (i & WDIOS_DISABLECARD)
            ret = watchdog_stop(data);
        else if (i & WDIOS_ENABLECARD)
            ret = watchdog_trigger(data);
        else
            ret = -EINVAL;

        break;
    default:
        ret = -ENOTTY;
    }
    return ret;
}

static const struct file_operations watchdog_fops = {
    .owner = THIS_MODULE,
    .llseek = no_llseek,
    .open = watchdog_open,
    .release = watchdog_release,
    .write = watchdog_write,
    .unlocked_ioctl = watchdog_ioctl,
};


/*
 * Detect, register, unregister and update device functions
 */

/*
 * DMI decode routine to read voltage scaling factors from special DMI tables,
 * which are available on FSC machines with an fscher or later chip.
 */
static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
{
    int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;

    /*
     * dmi code ugliness, we get passed the address of the contents of
     * a complete DMI record, but in the form of a dmi_header pointer, in
     * reality this address holds header->length bytes of which the header
     * are the first 4 bytes
     */
    u8 *dmi_data = (u8 *)header;

    /* We are looking for OEM-specific type 185 */
    if (header->type != 185)
        return;

    /*
     * we are looking for what Siemens calls "subtype" 19, the subtype
     * is stored in byte 5 of the dmi block
     */
    if (header->length < 5 || dmi_data[4] != 19)
        return;

    /*
     * After the subtype comes 1 unknown byte and then blocks of 5 bytes,
     * consisting of what Siemens calls an "Entity" number, followed by
     * 2 16-bit words in LSB first order
     */
    for (i = 6; (i + 4) < header->length; i += 5) {
        /* entity 1 - 3: voltage multiplier and offset */
        if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
            /* Our in sensors order and the DMI order differ */
            const int shuffle[3] = { 1, 0, 2 };
            int in = shuffle[dmi_data[i] - 1];

            /* Check for twice the same entity */
            if (found & (1 << in))
                return;

            mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
            offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);

            found |= 1 << in;
        }

        /* entity 7: reference voltage */
        if (dmi_data[i] == 7) {
            /* Check for twice the same entity */
            if (found & 0x08)
                return;

            vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);

            found |= 0x08;
        }
    }

    if (found == 0x0F) {
        for (i = 0; i < 3; i++) {
            dmi_mult[i] = mult[i] * 10;
            dmi_offset[i] = offset[i] * 10;
        }
        /*
         * According to the docs there should be separate dmi entries
         * for the mult's and offsets of in3-5 of the syl, but on
         * my test machine these are not present
         */
        dmi_mult[3] = dmi_mult[2];
        dmi_mult[4] = dmi_mult[1];
        dmi_mult[5] = dmi_mult[2];
        dmi_offset[3] = dmi_offset[2];
        dmi_offset[4] = dmi_offset[1];
        dmi_offset[5] = dmi_offset[2];
        dmi_vref = vref;
    }
}

static int fschmd_detect(struct i2c_client *client,
             struct i2c_board_info *info)
{
    enum chips kind;
    struct i2c_adapter *adapter = client->adapter;
    char id[4];

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

    /* Detect & Identify the chip */
    id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
    id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
    id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
    id[3] = '\0';

    if (!strcmp(id, "PEG"))
        kind = fscpos;
    else if (!strcmp(id, "HER"))
        kind = fscher;
    else if (!strcmp(id, "SCY"))
        kind = fscscy;
    else if (!strcmp(id, "HRC"))
        kind = fschrc;
    else if (!strcmp(id, "HMD"))
        kind = fschmd;
    else if (!strcmp(id, "HDS"))
        kind = fschds;
    else if (!strcmp(id, "SYL"))
        kind = fscsyl;
    else
        return -ENODEV;

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

    return 0;
}

static int fschmd_probe(struct i2c_client *client,
            const struct i2c_device_id *id)
{
    struct fschmd_data *data;
    const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
                "Heracles", "Heimdall", "Hades", "Syleus" };
    const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
    int i, err;
    enum chips kind = id->driver_data;

    data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    i2c_set_clientdata(client, data);
    mutex_init(&data->update_lock);
    mutex_init(&data->watchdog_lock);
    INIT_LIST_HEAD(&data->list);
    kref_init(&data->kref);
    /*
     * Store client pointer in our data struct for watchdog usage
     * (where the client is found through a data ptr instead of the
     * otherway around)
     */
    data->client = client;
    data->kind = kind;

    if (kind == fscpos) {
        /*
         * The Poseidon has hardwired temp limits, fill these
         * in for the alarm resetting code
         */
        data->temp_max[0] = 70 + 128;
        data->temp_max[1] = 50 + 128;
        data->temp_max[2] = 50 + 128;
    }

    /* Read the special DMI table for fscher and newer chips */
    if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
        dmi_walk(fschmd_dmi_decode, NULL);
        if (dmi_vref == -1) {
            dev_warn(&client->dev,
                "Couldn't get voltage scaling factors from "
                "BIOS DMI table, using builtin defaults\n");
            dmi_vref = 33;
        }
    }

    /* Read in some never changing registers */
    data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
    data->global_control = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_CONTROL);
    data->watchdog_control = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_WDOG_CONTROL[data->kind]);
    data->watchdog_state = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_WDOG_STATE[data->kind]);
    data->watchdog_preset = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_WDOG_PRESET[data->kind]);

    err = device_create_file(&client->dev, &dev_attr_alert_led);
    if (err)
        goto exit_detach;

    for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
        err = device_create_file(&client->dev,
                    &fschmd_attr[i].dev_attr);
        if (err)
            goto exit_detach;
    }

    for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
        /* Poseidon doesn't have TEMP_LIMIT registers */
        if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
                show_temp_max)
            continue;

        if (kind == fscsyl) {
            if (i % 4 == 0)
                data->temp_status[i / 4] =
                    i2c_smbus_read_byte_data(client,
                        FSCHMD_REG_TEMP_STATE
                        [data->kind][i / 4]);
            if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
                continue;
        }

        err = device_create_file(&client->dev,
                    &fschmd_temp_attr[i].dev_attr);
        if (err)
            goto exit_detach;
    }

    for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
        /* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
        if (kind == fscpos &&
                !strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
                    "pwm3_auto_point1_pwm"))
            continue;

        if (kind == fscsyl) {
            if (i % 5 == 0)
                data->fan_status[i / 5] =
                    i2c_smbus_read_byte_data(client,
                        FSCHMD_REG_FAN_STATE
                        [data->kind][i / 5]);
            if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
                continue;
        }

        err = device_create_file(&client->dev,
                    &fschmd_fan_attr[i].dev_attr);
        if (err)
            goto exit_detach;
    }

    data->hwmon_dev = hwmon_device_register(&client->dev);
    if (IS_ERR(data->hwmon_dev)) {
        err = PTR_ERR(data->hwmon_dev);
        data->hwmon_dev = NULL;
        goto exit_detach;
    }

    /*
     * We take the data_mutex lock early so that watchdog_open() cannot
     * run when misc_register() has completed, but we've not yet added
     * our data to the watchdog_data_list (and set the default timeout)
     */
    mutex_lock(&watchdog_data_mutex);
    for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
        /* Register our watchdog part */
        snprintf(data->watchdog_name, sizeof(data->watchdog_name),
            "watchdog%c", (i == 0) ? '\0' : ('0' + i));
        data->watchdog_miscdev.name = data->watchdog_name;
        data->watchdog_miscdev.fops = &watchdog_fops;
        data->watchdog_miscdev.minor = watchdog_minors[i];
        err = misc_register(&data->watchdog_miscdev);
        if (err == -EBUSY)
            continue;
        if (err) {
            data->watchdog_miscdev.minor = 0;
            dev_err(&client->dev,
                "Registering watchdog chardev: %d\n", err);
            break;
        }

        list_add(&data->list, &watchdog_data_list);
        watchdog_set_timeout(data, 60);
        dev_info(&client->dev,
            "Registered watchdog chardev major 10, minor: %d\n",
            watchdog_minors[i]);
        break;
    }
    if (i == ARRAY_SIZE(watchdog_minors)) {
        data->watchdog_miscdev.minor = 0;
        dev_warn(&client->dev, "Couldn't register watchdog chardev "
            "(due to no free minor)\n");
    }
    mutex_unlock(&watchdog_data_mutex);

    dev_info(&client->dev, "Detected FSC %s chip, revision: %d\n",
        names[data->kind], (int) data->revision);

    return 0;

exit_detach:
    fschmd_remove(client); /* will also free data for us */
    return err;
}

static int fschmd_remove(struct i2c_client *client)
{
    struct fschmd_data *data = i2c_get_clientdata(client);
    int i;

    /* Unregister the watchdog (if registered) */
    if (data->watchdog_miscdev.minor) {
        misc_deregister(&data->watchdog_miscdev);
        if (data->watchdog_is_open) {
            dev_warn(&client->dev,
                "i2c client detached with watchdog open! "
                "Stopping watchdog.\n");
            watchdog_stop(data);
        }
        mutex_lock(&watchdog_data_mutex);
        list_del(&data->list);
        mutex_unlock(&watchdog_data_mutex);
        /* Tell the watchdog code the client is gone */
        mutex_lock(&data->watchdog_lock);
        data->client = NULL;
        mutex_unlock(&data->watchdog_lock);
    }

    /*
     * Check if registered in case we're called from fschmd_detect
     * to cleanup after an error
     */
    if (data->hwmon_dev)
        hwmon_device_unregister(data->hwmon_dev);

    device_remove_file(&client->dev, &dev_attr_alert_led);
    for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
        device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
    for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
        device_remove_file(&client->dev,
                    &fschmd_temp_attr[i].dev_attr);
    for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
        device_remove_file(&client->dev,
                    &fschmd_fan_attr[i].dev_attr);

    mutex_lock(&watchdog_data_mutex);
    kref_put(&data->kref, fschmd_release_resources);
    mutex_unlock(&watchdog_data_mutex);

    return 0;
}

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

    mutex_lock(&data->update_lock);

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

        for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
            data->temp_act[i] = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_TEMP_ACT[data->kind][i]);
            data->temp_status[i] = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_TEMP_STATE[data->kind][i]);

            /* The fscpos doesn't have TEMP_LIMIT registers */
            if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
                data->temp_max[i] = i2c_smbus_read_byte_data(
                    client,
                    FSCHMD_REG_TEMP_LIMIT[data->kind][i]);

            /*
             * reset alarm if the alarm condition is gone,
             * the chip doesn't do this itself
             */
            if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
                    FSCHMD_TEMP_ALARM_MASK &&
                    data->temp_act[i] < data->temp_max[i])
                i2c_smbus_write_byte_data(client,
                    FSCHMD_REG_TEMP_STATE[data->kind][i],
                    data->temp_status[i]);
        }

        for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
            data->fan_act[i] = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_FAN_ACT[data->kind][i]);
            data->fan_status[i] = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_FAN_STATE[data->kind][i]);
            data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
                    FSCHMD_REG_FAN_RIPPLE[data->kind][i]);

            /* The fscpos third fan doesn't have a fan_min */
            if (FSCHMD_REG_FAN_MIN[data->kind][i])
                data->fan_min[i] = i2c_smbus_read_byte_data(
                    client,
                    FSCHMD_REG_FAN_MIN[data->kind][i]);

            /* reset fan status if speed is back to > 0 */
            if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
                    data->fan_act[i])
                i2c_smbus_write_byte_data(client,
                    FSCHMD_REG_FAN_STATE[data->kind][i],
                    data->fan_status[i]);
        }

        for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
            data->volt[i] = i2c_smbus_read_byte_data(client,
                           FSCHMD_REG_VOLT[data->kind][i]);

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

    mutex_unlock(&data->update_lock);

    return data;
}

module_i2c_driver(fschmd_driver);

MODULE_AUTHOR("Hans de Goede <[email protected]>");
MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
            "and Syleus driver");
MODULE_LICENSE("GPL");