[PATCH] I2C: Move hwmon drivers (2/3)

Part 2: Move the driver files themselves.

Note that the patch "adds trailing whitespace", because it does move the
files as-is, and some files happen to have trailing whitespace.

From: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1184 insertions, 0 deletions

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
new file mode 100644
index 000000000000..db20c9e47393
--- /dev/null
+++ b/drivers/hwmon/it87.c
@@ -0,0 +1,1184 @@
+/*
+    it87.c - Part of lm_sensors, Linux kernel modules for hardware
+             monitoring.
+
+    Supports: IT8705F  Super I/O chip w/LPC interface & SMBus
+              IT8712F  Super I/O chip w/LPC interface & SMBus
+              Sis950   A clone of the IT8705F
+
+    Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com> 
+    Largely inspired by lm78.c of the same package
+
+    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.
+*/
+
+/*
+    djg@pdp8.net David Gesswein 7/18/01
+    Modified to fix bug with not all alarms enabled.
+    Added ability to read battery voltage and select temperature sensor
+    type at module load time.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+#include <linux/i2c-vid.h>
+#include <linux/hwmon-sysfs.h>
+#include <asm/io.h>
+
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
+                                        0x2e, 0x2f, I2C_CLIENT_END };
+static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };
+
+/* Insmod parameters */
+SENSORS_INSMOD_2(it87, it8712);
+
+#define REG     0x2e    /* The register to read/write */
+#define DEV     0x07    /* Register: Logical device select */
+#define VAL     0x2f    /* The value to read/write */
+#define PME     0x04    /* The device with the fan registers in it */
+#define DEVID   0x20    /* Register: Device ID */
+#define DEVREV  0x22    /* Register: Device Revision */
+
+static inline int
+superio_inb(int reg)
+{
+        outb(reg, REG);
+        return inb(VAL);
+}
+
+static int superio_inw(int reg)
+{
+        int val;
+        outb(reg++, REG);
+        val = inb(VAL) << 8;
+        outb(reg, REG);
+        val |= inb(VAL);
+        return val;
+}
+
+static inline void
+superio_select(void)
+{
+        outb(DEV, REG);
+        outb(PME, VAL);
+}
+
+static inline void
+superio_enter(void)
+{
+        outb(0x87, REG);
+        outb(0x01, REG);
+        outb(0x55, REG);
+        outb(0x55, REG);
+}
+
+static inline void
+superio_exit(void)
+{
+        outb(0x02, REG);
+        outb(0x02, VAL);
+}
+
+#define IT8712F_DEVID 0x8712
+#define IT8705F_DEVID 0x8705
+#define IT87_ACT_REG  0x30
+#define IT87_BASE_REG 0x60
+
+/* Update battery voltage after every reading if true */
+static int update_vbat;
+
+/* Not all BIOSes properly configure the PWM registers */
+static int fix_pwm_polarity;
+
+/* Chip Type */
+
+static u16 chip_type;
+
+/* Many IT87 constants specified below */
+
+/* Length of ISA address segment */
+#define IT87_EXTENT 8
+
+/* Where are the ISA address/data registers relative to the base address */
+#define IT87_ADDR_REG_OFFSET 5
+#define IT87_DATA_REG_OFFSET 6
+
+/*----- The IT87 registers -----*/
+
+#define IT87_REG_CONFIG        0x00
+
+#define IT87_REG_ALARM1        0x01
+#define IT87_REG_ALARM2        0x02
+#define IT87_REG_ALARM3        0x03
+
+#define IT87_REG_VID           0x0a
+#define IT87_REG_FAN_DIV       0x0b
+
+/* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
+
+#define IT87_REG_FAN(nr)       (0x0d + (nr))
+#define IT87_REG_FAN_MIN(nr)   (0x10 + (nr))
+#define IT87_REG_FAN_MAIN_CTRL 0x13
+#define IT87_REG_FAN_CTL       0x14
+#define IT87_REG_PWM(nr)       (0x15 + (nr))
+
+#define IT87_REG_VIN(nr)       (0x20 + (nr))
+#define IT87_REG_TEMP(nr)      (0x29 + (nr))
+
+#define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
+#define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
+#define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
+#define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
+
+#define IT87_REG_I2C_ADDR      0x48
+
+#define IT87_REG_VIN_ENABLE    0x50
+#define IT87_REG_TEMP_ENABLE   0x51
+
+#define IT87_REG_CHIPID        0x58
+
+#define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
+#define IN_FROM_REG(val) ((val) * 16)
+
+static inline u8 FAN_TO_REG(long rpm, int div)
+{
+        if (rpm == 0)
+                return 255;
+        rpm = SENSORS_LIMIT(rpm, 1, 1000000);
+        return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
+                             254);
+}
+
+#define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
+
+#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
+                                        ((val)+500)/1000),-128,127))
+#define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
+
+#define PWM_TO_REG(val)   ((val) >> 1)
+#define PWM_FROM_REG(val) (((val)&0x7f) << 1)
+
+static int DIV_TO_REG(int val)
+{
+        int answer = 0;
+        while ((val >>= 1) != 0)
+                answer++;
+        return answer;
+}
+#define DIV_FROM_REG(val) (1 << (val))
+
+
+/* For each registered IT87, we need to keep some data in memory. That
+   data is pointed to by it87_list[NR]->data. The structure itself is
+   dynamically allocated, at the same time when a new it87 client is
+   allocated. */
+struct it87_data {
+        struct i2c_client client;
+        struct semaphore lock;
+        enum chips type;
+
+        struct semaphore update_lock;
+        char valid;             /* !=0 if following fields are valid */
+        unsigned long last_updated;     /* In jiffies */
+
+        u8 in[9];               /* Register value */
+        u8 in_max[9];           /* Register value */
+        u8 in_min[9];           /* Register value */
+        u8 fan[3];              /* Register value */
+        u8 fan_min[3];          /* Register value */
+        u8 temp[3];             /* Register value */
+        u8 temp_high[3];        /* Register value */
+        u8 temp_low[3];         /* Register value */
+        u8 sensor;              /* Register value */
+        u8 fan_div[3];          /* Register encoding, shifted right */
+        u8 vid;                 /* Register encoding, combined */
+        int vrm;
+        u32 alarms;             /* Register encoding, combined */
+        u8 fan_main_ctrl;       /* Register value */
+        u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
+};
+
+
+static int it87_attach_adapter(struct i2c_adapter *adapter);
+static int it87_find(int *address);
+static int it87_detect(struct i2c_adapter *adapter, int address, int kind);
+static int it87_detach_client(struct i2c_client *client);
+
+static int it87_read_value(struct i2c_client *client, u8 register);
+static int it87_write_value(struct i2c_client *client, u8 register,
+                        u8 value);
+static struct it87_data *it87_update_device(struct device *dev);
+static int it87_check_pwm(struct i2c_client *client);
+static void it87_init_client(struct i2c_client *client, struct it87_data *data);
+
+
+static struct i2c_driver it87_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "it87",
+        .id             = I2C_DRIVERID_IT87,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = it87_attach_adapter,
+        .detach_client  = it87_detach_client,
+};
+
+static ssize_t show_in(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
+}
+
+static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
+}
+
+static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
+}
+
+static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        unsigned long val = simple_strtoul(buf, NULL, 10);
+
+        down(&data->update_lock);
+        data->in_min[nr] = IN_TO_REG(val);
+        it87_write_value(client, IT87_REG_VIN_MIN(nr), 
+                        data->in_min[nr]);
+        up(&data->update_lock);
+        return count;
+}
+static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        unsigned long val = simple_strtoul(buf, NULL, 10);
+
+        down(&data->update_lock);
+        data->in_max[nr] = IN_TO_REG(val);
+        it87_write_value(client, IT87_REG_VIN_MAX(nr), 
+                        data->in_max[nr]);
+        up(&data->update_lock);
+        return count;
+}
+
+#define show_in_offset(offset)                                  \
+static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
+                show_in, NULL, offset);
+
+#define limit_in_offset(offset)                                 \
+static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
+                show_in_min, set_in_min, offset);               \
+static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
+                show_in_max, set_in_max, offset);
+
+show_in_offset(0);
+limit_in_offset(0);
+show_in_offset(1);
+limit_in_offset(1);
+show_in_offset(2);
+limit_in_offset(2);
+show_in_offset(3);
+limit_in_offset(3);
+show_in_offset(4);
+limit_in_offset(4);
+show_in_offset(5);
+limit_in_offset(5);
+show_in_offset(6);
+limit_in_offset(6);
+show_in_offset(7);
+limit_in_offset(7);
+show_in_offset(8);
+
+/* 3 temperatures */
+static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
+}
+static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
+}
+static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
+}
+static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        down(&data->update_lock);
+        data->temp_high[nr] = TEMP_TO_REG(val);
+        it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
+        up(&data->update_lock);
+        return count;
+}
+static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        down(&data->update_lock);
+        data->temp_low[nr] = TEMP_TO_REG(val);
+        it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
+        up(&data->update_lock);
+        return count;
+}
+#define show_temp_offset(offset)                                        \
+static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
+                show_temp, NULL, offset - 1);                           \
+static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
+                show_temp_max, set_temp_max, offset - 1);               \
+static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
+                show_temp_min, set_temp_min, offset - 1);
+
+show_temp_offset(1);
+show_temp_offset(2);
+show_temp_offset(3);
+
+static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        u8 reg = data->sensor; /* In case the value is updated while we use it */
+        
+        if (reg & (1 << nr))
+                return sprintf(buf, "3\n");  /* thermal diode */
+        if (reg & (8 << nr))
+                return sprintf(buf, "2\n");  /* thermistor */
+        return sprintf(buf, "0\n");      /* disabled */
+}
+static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        down(&data->update_lock);
+
+        data->sensor &= ~(1 << nr);
+        data->sensor &= ~(8 << nr);
+        /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
+        if (val == 3)
+            data->sensor |= 1 << nr;
+        else if (val == 2)
+            data->sensor |= 8 << nr;
+        else if (val != 0) {
+                up(&data->update_lock);
+                return -EINVAL;
+        }
+        it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
+        up(&data->update_lock);
+        return count;
+}
+#define show_sensor_offset(offset)                                      \
+static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,       \
+                show_sensor, set_sensor, offset - 1);
+
+show_sensor_offset(1);
+show_sensor_offset(2);
+show_sensor_offset(3);
+
+/* 3 Fans */
+static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr], 
+                                DIV_FROM_REG(data->fan_div[nr])));
+}
+static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf,"%d\n",
+                FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
+}
+static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
+}
+static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
+}
+static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
+}
+static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        down(&data->update_lock);
+        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
+        it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
+        up(&data->update_lock);
+        return count;
+}
+static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+        int i, min[3];
+        u8 old;
+
+        down(&data->update_lock);
+        old = it87_read_value(client, IT87_REG_FAN_DIV);
+
+        for (i = 0; i < 3; i++)
+                min[i] = FAN_FROM_REG(data->fan_min[i], DIV_FROM_REG(data->fan_div[i]));
+
+        switch (nr) {
+        case 0:
+        case 1:
+                data->fan_div[nr] = DIV_TO_REG(val);
+                break;
+        case 2:
+                if (val < 8)
+                        data->fan_div[nr] = 1;
+                else
+                        data->fan_div[nr] = 3;
+        }
+        val = old & 0x80;
+        val |= (data->fan_div[0] & 0x07);
+        val |= (data->fan_div[1] & 0x07) << 3;
+        if (data->fan_div[2] == 3)
+                val |= 0x1 << 6;
+        it87_write_value(client, IT87_REG_FAN_DIV, val);
+
+        for (i = 0; i < 3; i++) {
+                data->fan_min[i]=FAN_TO_REG(min[i], DIV_FROM_REG(data->fan_div[i]));
+                it87_write_value(client, IT87_REG_FAN_MIN(i), data->fan_min[i]);
+        }
+        up(&data->update_lock);
+        return count;
+}
+static ssize_t set_pwm_enable(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        down(&data->update_lock);
+
+        if (val == 0) {
+                int tmp;
+                /* make sure the fan is on when in on/off mode */
+                tmp = it87_read_value(client, IT87_REG_FAN_CTL);
+                it87_write_value(client, IT87_REG_FAN_CTL, tmp | (1 << nr));
+                /* set on/off mode */
+                data->fan_main_ctrl &= ~(1 << nr);
+                it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
+        } else if (val == 1) {
+                /* set SmartGuardian mode */
+                data->fan_main_ctrl |= (1 << nr);
+                it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
+                /* set saved pwm value, clear FAN_CTLX PWM mode bit */
+                it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
+        } else {
+                up(&data->update_lock);
+                return -EINVAL;
+        }
+
+        up(&data->update_lock);
+        return count;
+}
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int val = simple_strtol(buf, NULL, 10);
+
+        if (val < 0 || val > 255)
+                return -EINVAL;
+
+        down(&data->update_lock);
+        data->manual_pwm_ctl[nr] = val;
+        if (data->fan_main_ctrl & (1 << nr))
+                it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
+        up(&data->update_lock);
+        return count;
+}
+
+#define show_fan_offset(offset)                                 \
+static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
+                show_fan, NULL, offset - 1);                    \
+static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
+                show_fan_min, set_fan_min, offset - 1);         \
+static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
+                show_fan_div, set_fan_div, offset - 1);
+
+show_fan_offset(1);
+show_fan_offset(2);
+show_fan_offset(3);
+
+#define show_pwm_offset(offset)                                         \
+static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,      \
+                show_pwm_enable, set_pwm_enable, offset - 1);           \
+static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,               \
+                show_pwm, set_pwm, offset - 1);
+
+show_pwm_offset(1);
+show_pwm_offset(2);
+show_pwm_offset(3);
+
+/* Alarms */
+static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%u\n", data->alarms);
+}
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+
+static ssize_t
+show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%ld\n", (long) data->vrm);
+}
+static ssize_t
+store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        u32 val;
+
+        val = simple_strtoul(buf, NULL, 10);
+        data->vrm = val;
+
+        return count;
+}
+static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
+#define device_create_file_vrm(client) \
+device_create_file(&client->dev, &dev_attr_vrm)
+
+static ssize_t
+show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct it87_data *data = it87_update_device(dev);
+        return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
+}
+static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
+#define device_create_file_vid(client) \
+device_create_file(&client->dev, &dev_attr_cpu0_vid)
+
+/* This function is called when:
+     * it87_driver is inserted (when this module is loaded), for each
+       available adapter
+     * when a new adapter is inserted (and it87_driver is still present) */
+static int it87_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_detect(adapter, &addr_data, it87_detect);
+}
+
+/* SuperIO detection - will change normal_isa[0] if a chip is found */
+static int it87_find(int *address)
+{
+        int err = -ENODEV;
+
+        superio_enter();
+        chip_type = superio_inw(DEVID);
+        if (chip_type != IT8712F_DEVID
+         && chip_type != IT8705F_DEVID)
+                goto exit;
+
+        superio_select();
+        if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
+                pr_info("it87: Device not activated, skipping\n");
+                goto exit;
+        }
+
+        *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
+        if (*address == 0) {
+                pr_info("it87: Base address not set, skipping\n");
+                goto exit;
+        }
+
+        err = 0;
+        pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
+                chip_type, *address, superio_inb(DEVREV) & 0x0f);
+
+exit:
+        superio_exit();
+        return err;
+}
+
+/* This function is called by i2c_detect */
+int it87_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+        int i;
+        struct i2c_client *new_client;
+        struct it87_data *data;
+        int err = 0;
+        const char *name = "";
+        int is_isa = i2c_is_isa_adapter(adapter);
+        int enable_pwm_interface;
+
+        if (!is_isa && 
+            !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                goto ERROR0;
+
+        /* Reserve the ISA region */
+        if (is_isa)
+                if (!request_region(address, IT87_EXTENT, it87_driver.name))
+                        goto ERROR0;
+
+        /* Probe whether there is anything available on this address. Already
+           done for SMBus and Super-I/O clients */
+        if (kind < 0) {
+                if (is_isa && !chip_type) {
+#define REALLY_SLOW_IO
+                        /* We need the timeouts for at least some IT87-like chips. But only
+                           if we read 'undefined' registers. */
+                        i = inb_p(address + 1);
+                        if (inb_p(address + 2) != i
+                         || inb_p(address + 3) != i
+                         || inb_p(address + 7) != i) {
+                                err = -ENODEV;
+                                goto ERROR1;
+                        }
+#undef REALLY_SLOW_IO
+
+                        /* Let's just hope nothing breaks here */
+                        i = inb_p(address + 5) & 0x7f;
+                        outb_p(~i & 0x7f, address + 5);
+                        if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
+                                outb_p(i, address + 5);
+                                err = -ENODEV;
+                                goto ERROR1;
+                        }
+                }
+        }
+
+        /* OK. For now, we presume we have a valid client. We now create the
+           client structure, even though we cannot fill it completely yet.
+           But it allows us to access it87_{read,write}_value. */
+
+        if (!(data = kmalloc(sizeof(struct it87_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto ERROR1;
+        }
+        memset(data, 0, sizeof(struct it87_data));
+
+        new_client = &data->client;
+        if (is_isa)
+                init_MUTEX(&data->lock);
+        i2c_set_clientdata(new_client, data);
+        new_client->addr = address;
+        new_client->adapter = adapter;
+        new_client->driver = &it87_driver;
+        new_client->flags = 0;
+
+        /* Now, we do the remaining detection. */
+
+        if (kind < 0) {
+                if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
+                  || (!is_isa
+                   && it87_read_value(new_client, IT87_REG_I2C_ADDR) != address)) {
+                        err = -ENODEV;
+                        goto ERROR2;
+                }
+        }
+
+        /* Determine the chip type. */
+        if (kind <= 0) {
+                i = it87_read_value(new_client, IT87_REG_CHIPID);
+                if (i == 0x90) {
+                        kind = it87;
+                        if ((is_isa) && (chip_type == IT8712F_DEVID))
+                                kind = it8712;
+                }
+                else {
+                        if (kind == 0)
+                                dev_info(&adapter->dev, 
+                                        "Ignoring 'force' parameter for unknown chip at "
+                                        "adapter %d, address 0x%02x\n",
+                                        i2c_adapter_id(adapter), address);
+                        err = -ENODEV;
+                        goto ERROR2;
+                }
+        }
+
+        if (kind == it87) {
+                name = "it87";
+        } else if (kind == it8712) {
+                name = "it8712";
+        }
+
+        /* Fill in the remaining client fields and put it into the global list */
+        strlcpy(new_client->name, name, I2C_NAME_SIZE);
+        data->type = kind;
+        data->valid = 0;
+        init_MUTEX(&data->update_lock);
+
+        /* Tell the I2C layer a new client has arrived */
+        if ((err = i2c_attach_client(new_client)))
+                goto ERROR2;
+
+        /* Check PWM configuration */
+        enable_pwm_interface = it87_check_pwm(new_client);
+
+        /* Initialize the IT87 chip */
+        it87_init_client(new_client, data);
+
+        /* Register sysfs hooks */
+        device_create_file(&new_client->dev, &sensor_dev_attr_in0_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in1_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in2_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in3_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in4_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in5_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in6_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in7_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in8_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in0_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in1_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in2_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in3_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in4_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in5_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in6_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in7_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in0_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in1_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in2_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in3_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in4_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in5_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in6_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_in7_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp1_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp2_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp3_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp1_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp2_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp3_max.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp1_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp2_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp3_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp1_type.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp2_type.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_temp3_type.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan1_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan2_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan3_input.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan1_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan2_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan3_min.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan1_div.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan2_div.dev_attr);
+        device_create_file(&new_client->dev, &sensor_dev_attr_fan3_div.dev_attr);
+        device_create_file(&new_client->dev, &dev_attr_alarms);
+        if (enable_pwm_interface) {
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm1_enable.dev_attr);
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm2_enable.dev_attr);
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm3_enable.dev_attr);
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm1.dev_attr);
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm2.dev_attr);
+                device_create_file(&new_client->dev, &sensor_dev_attr_pwm3.dev_attr);
+        }
+
+        if (data->type == it8712) {
+                data->vrm = i2c_which_vrm();
+                device_create_file_vrm(new_client);
+                device_create_file_vid(new_client);
+        }
+
+        return 0;
+
+ERROR2:
+        kfree(data);
+ERROR1:
+        if (is_isa)
+                release_region(address, IT87_EXTENT);
+ERROR0:
+        return err;
+}
+
+static int it87_detach_client(struct i2c_client *client)
+{
+        int err;
+
+        if ((err = i2c_detach_client(client))) {
+                dev_err(&client->dev,
+                        "Client deregistration failed, client not detached.\n");
+                return err;
+        }
+
+        if(i2c_is_isa_client(client))
+                release_region(client->addr, IT87_EXTENT);
+        kfree(i2c_get_clientdata(client));
+
+        return 0;
+}
+
+/* The SMBus locks itself, but ISA access must be locked explicitly! 
+   We don't want to lock the whole ISA bus, so we lock each client
+   separately.
+   We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
+   would slow down the IT87 access and should not be necessary. */
+static int it87_read_value(struct i2c_client *client, u8 reg)
+{
+        struct it87_data *data = i2c_get_clientdata(client);
+
+        int res;
+        if (i2c_is_isa_client(client)) {
+                down(&data->lock);
+                outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
+                res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
+                up(&data->lock);
+                return res;
+        } else
+                return i2c_smbus_read_byte_data(client, reg);
+}
+
+/* The SMBus locks itself, but ISA access muse be locked explicitly! 
+   We don't want to lock the whole ISA bus, so we lock each client
+   separately.
+   We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
+   would slow down the IT87 access and should not be necessary. */
+static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
+{
+        struct it87_data *data = i2c_get_clientdata(client);
+
+        if (i2c_is_isa_client(client)) {
+                down(&data->lock);
+                outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
+                outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
+                up(&data->lock);
+                return 0;
+        } else
+                return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+/* Return 1 if and only if the PWM interface is safe to use */
+static int it87_check_pwm(struct i2c_client *client)
+{
+        /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
+         * and polarity set to active low is sign that this is the case so we
+         * disable pwm control to protect the user. */
+        int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
+        if ((tmp & 0x87) == 0) {
+                if (fix_pwm_polarity) {
+                        /* The user asks us to attempt a chip reconfiguration.
+                         * This means switching to active high polarity and
+                         * inverting all fan speed values. */
+                        int i;
+                        u8 pwm[3];
+
+                        for (i = 0; i < 3; i++)
+                                pwm[i] = it87_read_value(client,
+                                                         IT87_REG_PWM(i));
+
+                        /* If any fan is in automatic pwm mode, the polarity
+                         * might be correct, as suspicious as it seems, so we
+                         * better don't change anything (but still disable the
+                         * PWM interface). */
+                        if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
+                                dev_info(&client->dev, "Reconfiguring PWM to "
+                                         "active high polarity\n");
+                                it87_write_value(client, IT87_REG_FAN_CTL,
+                                                 tmp | 0x87);
+                                for (i = 0; i < 3; i++)
+                                        it87_write_value(client,
+                                                         IT87_REG_PWM(i),
+                                                         0x7f & ~pwm[i]);
+                                return 1;
+                        }
+
+                        dev_info(&client->dev, "PWM configuration is "
+                                 "too broken to be fixed\n");
+                }
+
+                dev_info(&client->dev, "Detected broken BIOS "
+                         "defaults, disabling PWM interface\n");
+                return 0;
+        } else if (fix_pwm_polarity) {
+                dev_info(&client->dev, "PWM configuration looks "
+                         "sane, won't touch\n");
+        }
+
+        return 1;
+}
+
+/* Called when we have found a new IT87. */
+static void it87_init_client(struct i2c_client *client, struct it87_data *data)
+{
+        int tmp, i;
+
+        /* initialize to sane defaults:
+         * - if the chip is in manual pwm mode, this will be overwritten with
+         *   the actual settings on the chip (so in this case, initialization
+         *   is not needed)
+         * - if in automatic or on/off mode, we could switch to manual mode,
+         *   read the registers and set manual_pwm_ctl accordingly, but currently
+         *   this is not implemented, so we initialize to something sane */
+        for (i = 0; i < 3; i++) {
+                data->manual_pwm_ctl[i] = 0xff;
+        }
+
+        /* Check if temperature channnels are reset manually or by some reason */
+        tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
+        if ((tmp & 0x3f) == 0) {
+                /* Temp1,Temp3=thermistor; Temp2=thermal diode */
+                tmp = (tmp & 0xc0) | 0x2a;
+                it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
+        }
+        data->sensor = tmp;
+
+        /* Check if voltage monitors are reset manually or by some reason */
+        tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
+        if ((tmp & 0xff) == 0) {
+                /* Enable all voltage monitors */
+                it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
+        }
+
+        /* Check if tachometers are reset manually or by some reason */
+        data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
+        if ((data->fan_main_ctrl & 0x70) == 0) {
+                /* Enable all fan tachometers */
+                data->fan_main_ctrl |= 0x70;
+                it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
+        }
+
+        /* Set current fan mode registers and the default settings for the
+         * other mode registers */
+        for (i = 0; i < 3; i++) {
+                if (data->fan_main_ctrl & (1 << i)) {
+                        /* pwm mode */
+                        tmp = it87_read_value(client, IT87_REG_PWM(i));
+                        if (tmp & 0x80) {
+                                /* automatic pwm - not yet implemented, but
+                                 * leave the settings made by the BIOS alone
+                                 * until a change is requested via the sysfs
+                                 * interface */
+                        } else {
+                                /* manual pwm */
+                                data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
+                        }
+                }
+        }
+
+        /* Start monitoring */
+        it87_write_value(client, IT87_REG_CONFIG,
+                         (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
+                         | (update_vbat ? 0x41 : 0x01));
+}
+
+static struct it87_data *it87_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct it87_data *data = i2c_get_clientdata(client);
+        int i;
+
+        down(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+            || !data->valid) {
+
+                if (update_vbat) {
+                        /* Cleared after each update, so reenable.  Value
+                          returned by this read will be previous value */       
+                        it87_write_value(client, IT87_REG_CONFIG,
+                           it87_read_value(client, IT87_REG_CONFIG) | 0x40);
+                }
+                for (i = 0; i <= 7; i++) {
+                        data->in[i] =
+                            it87_read_value(client, IT87_REG_VIN(i));
+                        data->in_min[i] =
+                            it87_read_value(client, IT87_REG_VIN_MIN(i));
+                        data->in_max[i] =
+                            it87_read_value(client, IT87_REG_VIN_MAX(i));
+                }
+                data->in[8] =
+                    it87_read_value(client, IT87_REG_VIN(8));
+                /* Temperature sensor doesn't have limit registers, set
+                   to min and max value */
+                data->in_min[8] = 0;
+                data->in_max[8] = 255;
+
+                for (i = 0; i < 3; i++) {
+                        data->fan[i] =
+                            it87_read_value(client, IT87_REG_FAN(i));
+                        data->fan_min[i] =
+                            it87_read_value(client, IT87_REG_FAN_MIN(i));
+                }
+                for (i = 0; i < 3; i++) {
+                        data->temp[i] =
+                            it87_read_value(client, IT87_REG_TEMP(i));
+                        data->temp_high[i] =
+                            it87_read_value(client, IT87_REG_TEMP_HIGH(i));
+                        data->temp_low[i] =
+                            it87_read_value(client, IT87_REG_TEMP_LOW(i));
+                }
+
+                i = it87_read_value(client, IT87_REG_FAN_DIV);
+                data->fan_div[0] = i & 0x07;
+                data->fan_div[1] = (i >> 3) & 0x07;
+                data->fan_div[2] = (i & 0x40) ? 3 : 1;
+
+                data->alarms =
+                        it87_read_value(client, IT87_REG_ALARM1) |
+                        (it87_read_value(client, IT87_REG_ALARM2) << 8) |
+                        (it87_read_value(client, IT87_REG_ALARM3) << 16);
+                data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
+
+                data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
+                /* The 8705 does not have VID capability */
+                if (data->type == it8712) {
+                        data->vid = it87_read_value(client, IT87_REG_VID);
+                        data->vid &= 0x1f;
+                }
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        up(&data->update_lock);
+
+        return data;
+}
+
+static int __init sm_it87_init(void)
+{
+        int addr;
+
+        if (!it87_find(&addr)) {
+                normal_isa[0] = addr;
+        }
+        return i2c_add_driver(&it87_driver);
+}
+
+static void __exit sm_it87_exit(void)
+{
+        i2c_del_driver(&it87_driver);
+}
+
+
+MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
+MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
+module_param(update_vbat, bool, 0);
+MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
+module_param(fix_pwm_polarity, bool, 0);
+MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
+MODULE_LICENSE("GPL");
+
+module_init(sm_it87_init);
+module_exit(sm_it87_exit);