linux/audit.h: move ptrace.h include to kernel header

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / pc87427.c

/*
 *  pc87427.c - hardware monitoring driver for the
 *              National Semiconductor PC87427 Super-I/O chip
 *  Copyright (C) 2006, 2008, 2010  Jean Delvare <khali@linux-fr.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *  Supports the following chips:
 *
 *  Chip        #vin    #fan    #pwm    #temp   devid
 *  PC87427     -       8       4       6       0xF2
 *
 *  This driver assumes that no more than one chip is present.
 *  Only fans are fully supported so far. Temperatures are in read-only
 *  mode, and voltages aren't supported at all.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/io.h>

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static struct platform_device *pdev;

#define DRVNAME "pc87427"

/*
 * The lock mutex protects both the I/O accesses (needed because the
 * device is using banked registers) and the register cache (needed to keep
 * the data in the registers and the cache in sync at any time).
 */
struct pc87427_data {
        struct device *hwmon_dev;
        struct mutex lock;
        int address[2];
        const char *name;

        unsigned long last_updated;     /* in jiffies */
        u8 fan_enabled;                 /* bit vector */
        u16 fan[8];                     /* register values */
        u16 fan_min[8];                 /* register values */
        u8 fan_status[8];               /* register values */

        u8 pwm_enabled;                 /* bit vector */
        u8 pwm_auto_ok;                 /* bit vector */
        u8 pwm_enable[4];               /* register values */
        u8 pwm[4];                      /* register values */

        u8 temp_enabled;                /* bit vector */
        s16 temp[6];                    /* register values */
        s8 temp_min[6];                 /* register values */
        s8 temp_max[6];                 /* register values */
        s8 temp_crit[6];                /* register values */
        u8 temp_status[6];              /* register values */
        u8 temp_type[6];                /* register values */
};

struct pc87427_sio_data {
        unsigned short address[2];
        u8 has_fanin;
        u8 has_fanout;
};

/*
 * Super-I/O registers and operations
 */

#define SIOREG_LDSEL    0x07    /* Logical device select */
#define SIOREG_DEVID    0x20    /* Device ID */
#define SIOREG_CF2      0x22    /* Configuration 2 */
#define SIOREG_CF3      0x23    /* Configuration 3 */
#define SIOREG_CF4      0x24    /* Configuration 4 */
#define SIOREG_CF5      0x25    /* Configuration 5 */
#define SIOREG_CFB      0x2B    /* Configuration B */
#define SIOREG_CFC      0x2C    /* Configuration C */
#define SIOREG_CFD      0x2D    /* Configuration D */
#define SIOREG_ACT      0x30    /* Device activation */
#define SIOREG_MAP      0x50    /* I/O or memory mapping */
#define SIOREG_IOBASE   0x60    /* I/O base address */

static const u8 logdev[2] = { 0x09, 0x14 };
static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" };
#define LD_FAN          0
#define LD_IN           1
#define LD_TEMP         1

static inline void superio_outb(int sioaddr, int reg, int val)
{
        outb(reg, sioaddr);
        outb(val, sioaddr + 1);
}

static inline int superio_inb(int sioaddr, int reg)
{
        outb(reg, sioaddr);
        return inb(sioaddr + 1);
}

static inline void superio_exit(int sioaddr)
{
        outb(0x02, sioaddr);
        outb(0x02, sioaddr + 1);
}

/*
 * Logical devices
 */

#define REGION_LENGTH           32
#define PC87427_REG_BANK        0x0f
#define BANK_FM(nr)             (nr)
#define BANK_FT(nr)             (0x08 + (nr))
#define BANK_FC(nr)             (0x10 + (nr) * 2)
#define BANK_TM(nr)             (nr)
#define BANK_VM(nr)             (0x08 + (nr))

/*
 * I/O access functions
 */

/* ldi is the logical device index */
static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg)
{
        return inb(data->address[ldi] + reg);
}

/* Must be called with data->lock held, except during init */
static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi,
                                     u8 bank, u8 reg)
{
        outb(bank, data->address[ldi] + PC87427_REG_BANK);
        return inb(data->address[ldi] + reg);
}

/* Must be called with data->lock held, except during init */
static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi,
                                       u8 bank, u8 reg, u8 value)
{
        outb(bank, data->address[ldi] + PC87427_REG_BANK);
        outb(value, data->address[ldi] + reg);
}

/*
 * Fan registers and conversions
 */

/* fan data registers are 16-bit wide */
#define PC87427_REG_FAN                 0x12
#define PC87427_REG_FAN_MIN             0x14
#define PC87427_REG_FAN_STATUS          0x10

#define FAN_STATUS_STALL                (1 << 3)
#define FAN_STATUS_LOSPD                (1 << 1)
#define FAN_STATUS_MONEN                (1 << 0)

/*
 * Dedicated function to read all registers related to a given fan input.
 * This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 7
 */
static void pc87427_readall_fan(struct pc87427_data *data, u8 nr)
{
        int iobase = data->address[LD_FAN];

        outb(BANK_FM(nr), iobase + PC87427_REG_BANK);
        data->fan[nr] = inw(iobase + PC87427_REG_FAN);
        data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN);
        data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS);
        /* Clear fan alarm bits */
        outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS);
}

/*
 * The 2 LSB of fan speed registers are used for something different.
 * The actual 2 LSB of the measurements are not available.
 */
static inline unsigned long fan_from_reg(u16 reg)
{
        reg &= 0xfffc;
        if (reg == 0x0000 || reg == 0xfffc)
                return 0;
        return 5400000UL / reg;
}

/* The 2 LSB of the fan speed limit registers are not significant. */
static inline u16 fan_to_reg(unsigned long val)
{
        if (val < 83UL)
                return 0xffff;
        if (val >= 1350000UL)
                return 0x0004;
        return ((1350000UL + val / 2) / val) << 2;
}

/*
 * PWM registers and conversions
 */

#define PC87427_REG_PWM_ENABLE          0x10
#define PC87427_REG_PWM_DUTY            0x12

#define PWM_ENABLE_MODE_MASK            (7 << 4)
#define PWM_ENABLE_CTLEN                (1 << 0)

#define PWM_MODE_MANUAL                 (0 << 4)
#define PWM_MODE_AUTO                   (1 << 4)
#define PWM_MODE_OFF                    (2 << 4)
#define PWM_MODE_ON                     (7 << 4)

/*
 * Dedicated function to read all registers related to a given PWM output.
 * This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 3
 */
static void pc87427_readall_pwm(struct pc87427_data *data, u8 nr)
{
        int iobase = data->address[LD_FAN];

        outb(BANK_FC(nr), iobase + PC87427_REG_BANK);
        data->pwm_enable[nr] = inb(iobase + PC87427_REG_PWM_ENABLE);
        data->pwm[nr] = inb(iobase + PC87427_REG_PWM_DUTY);
}

static inline int pwm_enable_from_reg(u8 reg)
{
        switch (reg & PWM_ENABLE_MODE_MASK) {
        case PWM_MODE_ON:
                return 0;
        case PWM_MODE_MANUAL:
        case PWM_MODE_OFF:
                return 1;
        case PWM_MODE_AUTO:
                return 2;
        default:
                return -EPROTO;
        }
}

static inline u8 pwm_enable_to_reg(unsigned long val, u8 pwmval)
{
        switch (val) {
        default:
                return PWM_MODE_ON;
        case 1:
                return pwmval ? PWM_MODE_MANUAL : PWM_MODE_OFF;
        case 2:
                return PWM_MODE_AUTO;
        }
}

/*
 * Temperature registers and conversions
 */

#define PC87427_REG_TEMP_STATUS         0x10
#define PC87427_REG_TEMP                0x14
#define PC87427_REG_TEMP_MAX            0x18
#define PC87427_REG_TEMP_MIN            0x19
#define PC87427_REG_TEMP_CRIT           0x1a
#define PC87427_REG_TEMP_TYPE           0x1d

#define TEMP_STATUS_CHANEN              (1 << 0)
#define TEMP_STATUS_LOWFLG              (1 << 1)
#define TEMP_STATUS_HIGHFLG             (1 << 2)
#define TEMP_STATUS_CRITFLG             (1 << 3)
#define TEMP_STATUS_SENSERR             (1 << 5)
#define TEMP_TYPE_MASK                  (3 << 5)

#define TEMP_TYPE_THERMISTOR            (1 << 5)
#define TEMP_TYPE_REMOTE_DIODE          (2 << 5)
#define TEMP_TYPE_LOCAL_DIODE           (3 << 5)

/*
 * Dedicated function to read all registers related to a given temperature
 * input. This saves us quite a few locks and bank selections.
 * Must be called with data->lock held.
 * nr is from 0 to 5
 */
static void pc87427_readall_temp(struct pc87427_data *data, u8 nr)
{
        int iobase = data->address[LD_TEMP];

        outb(BANK_TM(nr), iobase + PC87427_REG_BANK);
        data->temp[nr] = le16_to_cpu(inw(iobase + PC87427_REG_TEMP));
        data->temp_max[nr] = inb(iobase + PC87427_REG_TEMP_MAX);
        data->temp_min[nr] = inb(iobase + PC87427_REG_TEMP_MIN);
        data->temp_crit[nr] = inb(iobase + PC87427_REG_TEMP_CRIT);
        data->temp_type[nr] = inb(iobase + PC87427_REG_TEMP_TYPE);
        data->temp_status[nr] = inb(iobase + PC87427_REG_TEMP_STATUS);
        /* Clear fan alarm bits */
        outb(data->temp_status[nr], iobase + PC87427_REG_TEMP_STATUS);
}

static inline unsigned int temp_type_from_reg(u8 reg)
{
        switch (reg & TEMP_TYPE_MASK) {
        case TEMP_TYPE_THERMISTOR:
                return 4;
        case TEMP_TYPE_REMOTE_DIODE:
        case TEMP_TYPE_LOCAL_DIODE:
                return 3;
        default:
                return 0;
        }
}

/*
 * We assume 8-bit thermal sensors; 9-bit thermal sensors are possible
 * too, but I have no idea how to figure out when they are used.
 */
static inline long temp_from_reg(s16 reg)
{
        return reg * 1000 / 256;
}

static inline long temp_from_reg8(s8 reg)
{
        return reg * 1000;
}

/*
 * Data interface
 */

static struct pc87427_data *pc87427_update_device(struct device *dev)
{
        struct pc87427_data *data = dev_get_drvdata(dev);
        int i;

        mutex_lock(&data->lock);
        if (!time_after(jiffies, data->last_updated + HZ)
         && data->last_updated)
                goto done;

        /* Fans */
        for (i = 0; i < 8; i++) {
                if (!(data->fan_enabled & (1 << i)))
                        continue;
                pc87427_readall_fan(data, i);
        }

        /* PWM outputs */
        for (i = 0; i < 4; i++) {
                if (!(data->pwm_enabled & (1 << i)))
                        continue;
                pc87427_readall_pwm(data, i);
        }

        /* Temperature channels */
        for (i = 0; i < 6; i++) {
                if (!(data->temp_enabled & (1 << i)))
                        continue;
                pc87427_readall_temp(data, i);
        }

        data->last_updated = jiffies;

done:
        mutex_unlock(&data->lock);
        return data;
}

static ssize_t show_fan_input(struct device *dev, struct device_attribute
                              *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr]));
}

static ssize_t show_fan_min(struct device *dev, struct device_attribute
                            *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr]));
}

static ssize_t show_fan_alarm(struct device *dev, struct device_attribute
                              *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static ssize_t show_fan_fault(struct device *dev, struct device_attribute
                              *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static ssize_t set_fan_min(struct device *dev, struct device_attribute
                           *devattr, const char *buf, size_t count)
{
        struct pc87427_data *data = dev_get_drvdata(dev);
        int nr = to_sensor_dev_attr(devattr)->index;
        unsigned long val;
        int iobase = data->address[LD_FAN];

        if (kstrtoul(buf, 10, &val) < 0)
                return -EINVAL;

        mutex_lock(&data->lock);
        outb(BANK_FM(nr), iobase + PC87427_REG_BANK);
        /*
         * The low speed limit registers are read-only while monitoring
         * is enabled, so we have to disable monitoring, then change the
         * limit, and finally enable monitoring again.
         */
        outb(0, iobase + PC87427_REG_FAN_STATUS);
        data->fan_min[nr] = fan_to_reg(val);
        outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN);
        outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS);
        mutex_unlock(&data->lock);

        return count;
}

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan_input, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan_input, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan_input, NULL, 4);
static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan_input, NULL, 5);
static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan_input, NULL, 6);
static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan_input, NULL, 7);

static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 2);
static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 3);
static SENSOR_DEVICE_ATTR(fan5_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 4);
static SENSOR_DEVICE_ATTR(fan6_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 5);
static SENSOR_DEVICE_ATTR(fan7_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 6);
static SENSOR_DEVICE_ATTR(fan8_min, S_IWUSR | S_IRUGO,
                          show_fan_min, set_fan_min, 7);

static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_fan_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_fan_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_fan_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_fan_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_fan_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(fan7_alarm, S_IRUGO, show_fan_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan8_alarm, S_IRUGO, show_fan_alarm, NULL, 7);

static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, show_fan_fault, NULL, 4);
static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, show_fan_fault, NULL, 5);
static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, show_fan_fault, NULL, 6);
static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, show_fan_fault, NULL, 7);

static struct attribute *pc87427_attributes_fan[8][5] = {
        {
                &sensor_dev_attr_fan1_input.dev_attr.attr,
                &sensor_dev_attr_fan1_min.dev_attr.attr,
                &sensor_dev_attr_fan1_alarm.dev_attr.attr,
                &sensor_dev_attr_fan1_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan2_input.dev_attr.attr,
                &sensor_dev_attr_fan2_min.dev_attr.attr,
                &sensor_dev_attr_fan2_alarm.dev_attr.attr,
                &sensor_dev_attr_fan2_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan3_input.dev_attr.attr,
                &sensor_dev_attr_fan3_min.dev_attr.attr,
                &sensor_dev_attr_fan3_alarm.dev_attr.attr,
                &sensor_dev_attr_fan3_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan4_input.dev_attr.attr,
                &sensor_dev_attr_fan4_min.dev_attr.attr,
                &sensor_dev_attr_fan4_alarm.dev_attr.attr,
                &sensor_dev_attr_fan4_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan5_input.dev_attr.attr,
                &sensor_dev_attr_fan5_min.dev_attr.attr,
                &sensor_dev_attr_fan5_alarm.dev_attr.attr,
                &sensor_dev_attr_fan5_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan6_input.dev_attr.attr,
                &sensor_dev_attr_fan6_min.dev_attr.attr,
                &sensor_dev_attr_fan6_alarm.dev_attr.attr,
                &sensor_dev_attr_fan6_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan7_input.dev_attr.attr,
                &sensor_dev_attr_fan7_min.dev_attr.attr,
                &sensor_dev_attr_fan7_alarm.dev_attr.attr,
                &sensor_dev_attr_fan7_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_fan8_input.dev_attr.attr,
                &sensor_dev_attr_fan8_min.dev_attr.attr,
                &sensor_dev_attr_fan8_alarm.dev_attr.attr,
                &sensor_dev_attr_fan8_fault.dev_attr.attr,
                NULL
        }
};

static const struct attribute_group pc87427_group_fan[8] = {
        { .attrs = pc87427_attributes_fan[0] },
        { .attrs = pc87427_attributes_fan[1] },
        { .attrs = pc87427_attributes_fan[2] },
        { .attrs = pc87427_attributes_fan[3] },
        { .attrs = pc87427_attributes_fan[4] },
        { .attrs = pc87427_attributes_fan[5] },
        { .attrs = pc87427_attributes_fan[6] },
        { .attrs = pc87427_attributes_fan[7] },
};

/*
 * Must be called with data->lock held and pc87427_readall_pwm() freshly
 * called
 */
static void update_pwm_enable(struct pc87427_data *data, int nr, u8 mode)
{
        int iobase = data->address[LD_FAN];
        data->pwm_enable[nr] &= ~PWM_ENABLE_MODE_MASK;
        data->pwm_enable[nr] |= mode;
        outb(data->pwm_enable[nr], iobase + PC87427_REG_PWM_ENABLE);
}

static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
                               *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;
        int pwm_enable;

        pwm_enable = pwm_enable_from_reg(data->pwm_enable[nr]);
        if (pwm_enable < 0)
                return pwm_enable;
        return sprintf(buf, "%d\n", pwm_enable);
}

static ssize_t set_pwm_enable(struct device *dev, struct device_attribute
                              *devattr, const char *buf, size_t count)
{
        struct pc87427_data *data = dev_get_drvdata(dev);
        int nr = to_sensor_dev_attr(devattr)->index;
        unsigned long val;

        if (kstrtoul(buf, 10, &val) < 0 || val > 2)
                return -EINVAL;
        /* Can't go to automatic mode if it isn't configured */
        if (val == 2 && !(data->pwm_auto_ok & (1 << nr)))
                return -EINVAL;

        mutex_lock(&data->lock);
        pc87427_readall_pwm(data, nr);
        update_pwm_enable(data, nr, pwm_enable_to_reg(val, data->pwm[nr]));
        mutex_unlock(&data->lock);

        return count;
}

static ssize_t show_pwm(struct device *dev, struct device_attribute
                        *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%d\n", (int)data->pwm[nr]);
}

static ssize_t set_pwm(struct device *dev, struct device_attribute
                       *devattr, const char *buf, size_t count)
{
        struct pc87427_data *data = dev_get_drvdata(dev);
        int nr = to_sensor_dev_attr(devattr)->index;
        unsigned long val;
        int iobase = data->address[LD_FAN];
        u8 mode;

        if (kstrtoul(buf, 10, &val) < 0 || val > 0xff)
                return -EINVAL;

        mutex_lock(&data->lock);
        pc87427_readall_pwm(data, nr);
        mode = data->pwm_enable[nr] & PWM_ENABLE_MODE_MASK;
        if (mode != PWM_MODE_MANUAL && mode != PWM_MODE_OFF) {
                dev_notice(dev, "Can't set PWM%d duty cycle while not in "
                           "manual mode\n", nr + 1);
                mutex_unlock(&data->lock);
                return -EPERM;
        }

        /* We may have to change the mode */
        if (mode == PWM_MODE_MANUAL && val == 0) {
                /* Transition from Manual to Off */
                update_pwm_enable(data, nr, PWM_MODE_OFF);
                mode = PWM_MODE_OFF;
                dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
                        "manual", "off");
        } else if (mode == PWM_MODE_OFF && val != 0) {
                /* Transition from Off to Manual */
                update_pwm_enable(data, nr, PWM_MODE_MANUAL);
                mode = PWM_MODE_MANUAL;
                dev_dbg(dev, "Switching PWM%d from %s to %s\n", nr + 1,
                        "off", "manual");
        }

        data->pwm[nr] = val;
        if (mode == PWM_MODE_MANUAL)
                outb(val, iobase + PC87427_REG_PWM_DUTY);
        mutex_unlock(&data->lock);

        return count;
}

static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
                          show_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
                          show_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
                          show_pwm_enable, set_pwm_enable, 2);
static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
                          show_pwm_enable, set_pwm_enable, 3);

static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 3);

static struct attribute *pc87427_attributes_pwm[4][3] = {
        {
                &sensor_dev_attr_pwm1_enable.dev_attr.attr,
                &sensor_dev_attr_pwm1.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_pwm2_enable.dev_attr.attr,
                &sensor_dev_attr_pwm2.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_pwm3_enable.dev_attr.attr,
                &sensor_dev_attr_pwm3.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_pwm4_enable.dev_attr.attr,
                &sensor_dev_attr_pwm4.dev_attr.attr,
                NULL
        }
};

static const struct attribute_group pc87427_group_pwm[4] = {
        { .attrs = pc87427_attributes_pwm[0] },
        { .attrs = pc87427_attributes_pwm[1] },
        { .attrs = pc87427_attributes_pwm[2] },
        { .attrs = pc87427_attributes_pwm[3] },
};

static ssize_t show_temp_input(struct device *dev, struct device_attribute
                               *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%ld\n", temp_from_reg(data->temp[nr]));
}

static ssize_t show_temp_min(struct device *dev, struct device_attribute
                             *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_min[nr]));
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute
                             *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_max[nr]));
}

static ssize_t show_temp_crit(struct device *dev, struct device_attribute
                              *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_crit[nr]));
}

static ssize_t show_temp_type(struct device *dev, struct device_attribute
                              *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

        return sprintf(buf, "%u\n", temp_type_from_reg(data->temp_type[nr]));
}

static ssize_t show_temp_min_alarm(struct device *dev, struct device_attribute
                                   *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static ssize_t show_temp_max_alarm(struct device *dev, struct device_attribute
                                   *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static ssize_t show_temp_crit_alarm(struct device *dev, struct device_attribute
                                   *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static ssize_t show_temp_fault(struct device *dev, struct device_attribute
                               *devattr, char *buf)
{
        struct pc87427_data *data = pc87427_update_device(dev);
        int nr = to_sensor_dev_attr(devattr)->index;

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

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_min, S_IRUGO, show_temp_min, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, show_temp_type, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO, show_temp_type, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO, show_temp_type, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_type, S_IRUGO, show_temp_type, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_type, S_IRUGO, show_temp_type, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_type, S_IRUGO, show_temp_type, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_min_alarm, S_IRUGO,
                          show_temp_min_alarm, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO,
                          show_temp_max_alarm, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO,
                          show_temp_crit_alarm, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);

static struct attribute *pc87427_attributes_temp[6][10] = {
        {
                &sensor_dev_attr_temp1_input.dev_attr.attr,
                &sensor_dev_attr_temp1_min.dev_attr.attr,
                &sensor_dev_attr_temp1_max.dev_attr.attr,
                &sensor_dev_attr_temp1_crit.dev_attr.attr,
                &sensor_dev_attr_temp1_type.dev_attr.attr,
                &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp1_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_temp2_input.dev_attr.attr,
                &sensor_dev_attr_temp2_min.dev_attr.attr,
                &sensor_dev_attr_temp2_max.dev_attr.attr,
                &sensor_dev_attr_temp2_crit.dev_attr.attr,
                &sensor_dev_attr_temp2_type.dev_attr.attr,
                &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp2_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_temp3_input.dev_attr.attr,
                &sensor_dev_attr_temp3_min.dev_attr.attr,
                &sensor_dev_attr_temp3_max.dev_attr.attr,
                &sensor_dev_attr_temp3_crit.dev_attr.attr,
                &sensor_dev_attr_temp3_type.dev_attr.attr,
                &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp3_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_temp4_input.dev_attr.attr,
                &sensor_dev_attr_temp4_min.dev_attr.attr,
                &sensor_dev_attr_temp4_max.dev_attr.attr,
                &sensor_dev_attr_temp4_crit.dev_attr.attr,
                &sensor_dev_attr_temp4_type.dev_attr.attr,
                &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp4_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_temp5_input.dev_attr.attr,
                &sensor_dev_attr_temp5_min.dev_attr.attr,
                &sensor_dev_attr_temp5_max.dev_attr.attr,
                &sensor_dev_attr_temp5_crit.dev_attr.attr,
                &sensor_dev_attr_temp5_type.dev_attr.attr,
                &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp5_fault.dev_attr.attr,
                NULL
        }, {
                &sensor_dev_attr_temp6_input.dev_attr.attr,
                &sensor_dev_attr_temp6_min.dev_attr.attr,
                &sensor_dev_attr_temp6_max.dev_attr.attr,
                &sensor_dev_attr_temp6_crit.dev_attr.attr,
                &sensor_dev_attr_temp6_type.dev_attr.attr,
                &sensor_dev_attr_temp6_min_alarm.dev_attr.attr,
                &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
                &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
                &sensor_dev_attr_temp6_fault.dev_attr.attr,
                NULL
        }
};

static const struct attribute_group pc87427_group_temp[6] = {
        { .attrs = pc87427_attributes_temp[0] },
        { .attrs = pc87427_attributes_temp[1] },
        { .attrs = pc87427_attributes_temp[2] },
        { .attrs = pc87427_attributes_temp[3] },
        { .attrs = pc87427_attributes_temp[4] },
        { .attrs = pc87427_attributes_temp[5] },
};

static ssize_t show_name(struct device *dev, struct device_attribute
                         *devattr, char *buf)
{
        struct pc87427_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);


/*
 * Device detection, attach and detach
 */

static int pc87427_request_regions(struct platform_device *pdev,
                                             int count)
{
        struct resource *res;
        int i;

        for (i = 0; i < count; i++) {
                res = platform_get_resource(pdev, IORESOURCE_IO, i);
                if (!res) {
                        dev_err(&pdev->dev, "Missing resource #%d\n", i);
                        return -ENOENT;
                }
                if (!devm_request_region(&pdev->dev, res->start,
                                         resource_size(res), DRVNAME)) {
                        dev_err(&pdev->dev,
                                "Failed to request region 0x%lx-0x%lx\n",
                                (unsigned long)res->start,
                                (unsigned long)res->end);
                        return -EBUSY;
                }
        }
        return 0;
}

static void pc87427_init_device(struct device *dev)
{
        struct pc87427_sio_data *sio_data = dev->platform_data;
        struct pc87427_data *data = dev_get_drvdata(dev);
        int i;
        u8 reg;

        /* The FMC module should be ready */
        reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK);
        if (!(reg & 0x80))
                dev_warn(dev, "%s module not ready!\n", "FMC");

        /* Check which fans are enabled */
        for (i = 0; i < 8; i++) {
                if (!(sio_data->has_fanin & (1 << i)))  /* Not wired */
                        continue;
                reg = pc87427_read8_bank(data, LD_FAN, BANK_FM(i),
                                         PC87427_REG_FAN_STATUS);
                if (reg & FAN_STATUS_MONEN)
                        data->fan_enabled |= (1 << i);
        }

        if (!data->fan_enabled) {
                dev_dbg(dev, "Enabling monitoring of all fans\n");
                for (i = 0; i < 8; i++) {
                        if (!(sio_data->has_fanin & (1 << i)))  /* Not wired */
                                continue;
                        pc87427_write8_bank(data, LD_FAN, BANK_FM(i),
                                            PC87427_REG_FAN_STATUS,
                                            FAN_STATUS_MONEN);
                }
                data->fan_enabled = sio_data->has_fanin;
        }

        /* Check which PWM outputs are enabled */
        for (i = 0; i < 4; i++) {
                if (!(sio_data->has_fanout & (1 << i))) /* Not wired */
                        continue;
                reg = pc87427_read8_bank(data, LD_FAN, BANK_FC(i),
                                         PC87427_REG_PWM_ENABLE);
                if (reg & PWM_ENABLE_CTLEN)
                        data->pwm_enabled |= (1 << i);

                /*
                 * We don't expose an interface to reconfigure the automatic
                 * fan control mode, so only allow to return to this mode if
                 * it was originally set.
                 */
                if ((reg & PWM_ENABLE_MODE_MASK) == PWM_MODE_AUTO) {
                        dev_dbg(dev, "PWM%d is in automatic control mode\n",
                                i + 1);
                        data->pwm_auto_ok |= (1 << i);
                }
        }

        /* The HMC module should be ready */
        reg = pc87427_read8(data, LD_TEMP, PC87427_REG_BANK);
        if (!(reg & 0x80))
                dev_warn(dev, "%s module not ready!\n", "HMC");

        /* Check which temperature channels are enabled */
        for (i = 0; i < 6; i++) {
                reg = pc87427_read8_bank(data, LD_TEMP, BANK_TM(i),
                                         PC87427_REG_TEMP_STATUS);
                if (reg & TEMP_STATUS_CHANEN)
                        data->temp_enabled |= (1 << i);
        }
}

static void pc87427_remove_files(struct device *dev)
{
        struct pc87427_data *data = dev_get_drvdata(dev);
        int i;

        device_remove_file(dev, &dev_attr_name);
        for (i = 0; i < 8; i++) {
                if (!(data->fan_enabled & (1 << i)))
                        continue;
                sysfs_remove_group(&dev->kobj, &pc87427_group_fan[i]);
        }
        for (i = 0; i < 4; i++) {
                if (!(data->pwm_enabled & (1 << i)))
                        continue;
                sysfs_remove_group(&dev->kobj, &pc87427_group_pwm[i]);
        }
        for (i = 0; i < 6; i++) {
                if (!(data->temp_enabled & (1 << i)))
                        continue;
                sysfs_remove_group(&dev->kobj, &pc87427_group_temp[i]);
        }
}

static int pc87427_probe(struct platform_device *pdev)
{
        struct pc87427_sio_data *sio_data = pdev->dev.platform_data;
        struct pc87427_data *data;
        int i, err, res_count;

        data = devm_kzalloc(&pdev->dev, sizeof(struct pc87427_data),
                            GFP_KERNEL);
        if (!data) {
                pr_err("Out of memory\n");
                return -ENOMEM;
        }

        data->address[0] = sio_data->address[0];
        data->address[1] = sio_data->address[1];
        res_count = (data->address[0] != 0) + (data->address[1] != 0);

        err = pc87427_request_regions(pdev, res_count);
        if (err)
                return err;

        mutex_init(&data->lock);
        data->name = "pc87427";
        platform_set_drvdata(pdev, data);
        pc87427_init_device(&pdev->dev);

        /* Register sysfs hooks */
        err = device_create_file(&pdev->dev, &dev_attr_name);
        if (err)
                return err;
        for (i = 0; i < 8; i++) {
                if (!(data->fan_enabled & (1 << i)))
                        continue;
                err = sysfs_create_group(&pdev->dev.kobj,
                                         &pc87427_group_fan[i]);
                if (err)
                        goto exit_remove_files;
        }
        for (i = 0; i < 4; i++) {
                if (!(data->pwm_enabled & (1 << i)))
                        continue;
                err = sysfs_create_group(&pdev->dev.kobj,
                                         &pc87427_group_pwm[i]);
                if (err)
                        goto exit_remove_files;
        }
        for (i = 0; i < 6; i++) {
                if (!(data->temp_enabled & (1 << i)))
                        continue;
                err = sysfs_create_group(&pdev->dev.kobj,
                                         &pc87427_group_temp[i]);
                if (err)
                        goto exit_remove_files;
        }

        data->hwmon_dev = hwmon_device_register(&pdev->dev);
        if (IS_ERR(data->hwmon_dev)) {
                err = PTR_ERR(data->hwmon_dev);
                dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
                goto exit_remove_files;
        }

        return 0;

exit_remove_files:
        pc87427_remove_files(&pdev->dev);
        return err;
}

static int pc87427_remove(struct platform_device *pdev)
{
        struct pc87427_data *data = platform_get_drvdata(pdev);

        hwmon_device_unregister(data->hwmon_dev);
        pc87427_remove_files(&pdev->dev);

        return 0;
}


static struct platform_driver pc87427_driver = {
        .driver = {
                .owner  = THIS_MODULE,
                .name   = DRVNAME,
        },
        .probe          = pc87427_probe,
        .remove         = pc87427_remove,
};

static int __init pc87427_device_add(const struct pc87427_sio_data *sio_data)
{
        struct resource res[2] = {
                { .flags        = IORESOURCE_IO },
                { .flags        = IORESOURCE_IO },
        };
        int err, i, res_count;

        res_count = 0;
        for (i = 0; i < 2; i++) {
                if (!sio_data->address[i])
                        continue;
                res[res_count].start = sio_data->address[i];
                res[res_count].end = sio_data->address[i] + REGION_LENGTH - 1;
                res[res_count].name = logdev_str[i];

                err = acpi_check_resource_conflict(&res[res_count]);
                if (err)
                        goto exit;

                res_count++;
        }

        pdev = platform_device_alloc(DRVNAME, res[0].start);
        if (!pdev) {
                err = -ENOMEM;
                pr_err("Device allocation failed\n");
                goto exit;
        }

        err = platform_device_add_resources(pdev, res, res_count);
        if (err) {
                pr_err("Device resource addition failed (%d)\n", err);
                goto exit_device_put;
        }

        err = platform_device_add_data(pdev, sio_data,
                                       sizeof(struct pc87427_sio_data));
        if (err) {
                pr_err("Platform data allocation failed\n");
                goto exit_device_put;
        }

        err = platform_device_add(pdev);
        if (err) {
                pr_err("Device addition failed (%d)\n", err);
                goto exit_device_put;
        }

        return 0;

exit_device_put:
        platform_device_put(pdev);
exit:
        return err;
}

static int __init pc87427_find(int sioaddr, struct pc87427_sio_data *sio_data)
{
        u16 val;
        u8 cfg, cfg_b;
        int i, err = 0;

        /* Identify device */
        val = force_id ? force_id : superio_inb(sioaddr, SIOREG_DEVID);
        if (val != 0xf2) {      /* PC87427 */
                err = -ENODEV;
                goto exit;
        }

        for (i = 0; i < 2; i++) {
                sio_data->address[i] = 0;
                /* Select logical device */
                superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]);

                val = superio_inb(sioaddr, SIOREG_ACT);
                if (!(val & 0x01)) {
                        pr_info("Logical device 0x%02x not activated\n",
                                logdev[i]);
                        continue;
                }

                val = superio_inb(sioaddr, SIOREG_MAP);
                if (val & 0x01) {
                        pr_warn("Logical device 0x%02x is memory-mapped, "
                                "can't use\n", logdev[i]);
                        continue;
                }

                val = (superio_inb(sioaddr, SIOREG_IOBASE) << 8)
                    | superio_inb(sioaddr, SIOREG_IOBASE + 1);
                if (!val) {
                        pr_info("I/O base address not set for logical device "
                                "0x%02x\n", logdev[i]);
                        continue;
                }
                sio_data->address[i] = val;
        }

        /* No point in loading the driver if everything is disabled */
        if (!sio_data->address[0] && !sio_data->address[1]) {
                err = -ENODEV;
                goto exit;
        }

        /* Check which fan inputs are wired */
        sio_data->has_fanin = (1 << 2) | (1 << 3);      /* FANIN2, FANIN3 */

        cfg = superio_inb(sioaddr, SIOREG_CF2);
        if (!(cfg & (1 << 3)))
                sio_data->has_fanin |= (1 << 0);        /* FANIN0 */
        if (!(cfg & (1 << 2)))
                sio_data->has_fanin |= (1 << 4);        /* FANIN4 */

        cfg = superio_inb(sioaddr, SIOREG_CFD);
        if (!(cfg & (1 << 0)))
                sio_data->has_fanin |= (1 << 1);        /* FANIN1 */

        cfg = superio_inb(sioaddr, SIOREG_CF4);
        if (!(cfg & (1 << 0)))
                sio_data->has_fanin |= (1 << 7);        /* FANIN7 */
        cfg_b = superio_inb(sioaddr, SIOREG_CFB);
        if (!(cfg & (1 << 1)) && (cfg_b & (1 << 3)))
                sio_data->has_fanin |= (1 << 5);        /* FANIN5 */
        cfg = superio_inb(sioaddr, SIOREG_CF3);
        if ((cfg & (1 << 3)) && !(cfg_b & (1 << 5)))
                sio_data->has_fanin |= (1 << 6);        /* FANIN6 */

        /* Check which fan outputs are wired */
        sio_data->has_fanout = (1 << 0);                /* FANOUT0 */
        if (cfg_b & (1 << 0))
                sio_data->has_fanout |= (1 << 3);       /* FANOUT3 */

        cfg = superio_inb(sioaddr, SIOREG_CFC);
        if (!(cfg & (1 << 4))) {
                if (cfg_b & (1 << 1))
                        sio_data->has_fanout |= (1 << 1); /* FANOUT1 */
                if (cfg_b & (1 << 2))
                        sio_data->has_fanout |= (1 << 2); /* FANOUT2 */
        }

        /* FANOUT1 and FANOUT2 can each be routed to 2 different pins */
        cfg = superio_inb(sioaddr, SIOREG_CF5);
        if (cfg & (1 << 6))
                sio_data->has_fanout |= (1 << 1);       /* FANOUT1 */
        if (cfg & (1 << 5))
                sio_data->has_fanout |= (1 << 2);       /* FANOUT2 */

exit:
        superio_exit(sioaddr);
        return err;
}

static int __init pc87427_init(void)
{
        int err;
        struct pc87427_sio_data sio_data;

        if (pc87427_find(0x2e, &sio_data)
         && pc87427_find(0x4e, &sio_data))
                return -ENODEV;

        err = platform_driver_register(&pc87427_driver);
        if (err)
                goto exit;

        /* Sets global pdev as a side effect */
        err = pc87427_device_add(&sio_data);
        if (err)
                goto exit_driver;

        return 0;

exit_driver:
        platform_driver_unregister(&pc87427_driver);
exit:
        return err;
}

static void __exit pc87427_exit(void)
{
        platform_device_unregister(pdev);
        platform_driver_unregister(&pc87427_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("PC87427 hardware monitoring driver");
MODULE_LICENSE("GPL");

module_init(pc87427_init);
module_exit(pc87427_exit);