/*
   * fschmd.c
   *
   * Copyright (C) 2007 - 2009 Hans de Goede <hdegoede@redhat.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *  Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
   *  Scylla, Heracles, Heimdall, Hades and Syleus chips
   *
   *  Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
   *  (candidate) fschmd drivers:
   *  Copyright (C) 2006 Thilo Cestonaro
   *			<thilo.cestonaro.external@fujitsu-siemens.com>
   *  Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
   *  Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
   *  Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de>
   *  Copyright (C) 2000 Hermann Jung <hej@odn.de>
   */
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/jiffies.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/err.h>
  #include <linux/mutex.h>
  #include <linux/sysfs.h>
  #include <linux/dmi.h>
  #include <linux/fs.h>
  #include <linux/watchdog.h>
  #include <linux/miscdevice.h>
  #include <linux/uaccess.h>
  #include <linux/kref.h>
  
  /* Addresses to scan */
  static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  
  /* Insmod parameters */
  static bool nowayout = WATCHDOG_NOWAYOUT;
  module_param(nowayout, bool, 0);
  MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
  	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  
  enum chips { fscpos, fscher, fscscy, fschrc, fschmd, fschds, fscsyl };
  
  /*
   * The FSCHMD registers and other defines
   */
  
  /* chip identification */
  #define FSCHMD_REG_IDENT_0		0x00
  #define FSCHMD_REG_IDENT_1		0x01
  #define FSCHMD_REG_IDENT_2		0x02
  #define FSCHMD_REG_REVISION		0x03
  
  /* global control and status */
  #define FSCHMD_REG_EVENT_STATE		0x04
  #define FSCHMD_REG_CONTROL		0x05
  
  #define FSCHMD_CONTROL_ALERT_LED	0x01
  
  /* watchdog */
  static const u8 FSCHMD_REG_WDOG_CONTROL[7] = {
  	0x21, 0x21, 0x21, 0x21, 0x21, 0x28, 0x28 };
  static const u8 FSCHMD_REG_WDOG_STATE[7] = {
  	0x23, 0x23, 0x23, 0x23, 0x23, 0x29, 0x29 };
  static const u8 FSCHMD_REG_WDOG_PRESET[7] = {
  	0x28, 0x28, 0x28, 0x28, 0x28, 0x2a, 0x2a };
  
  #define FSCHMD_WDOG_CONTROL_TRIGGER	0x10
  #define FSCHMD_WDOG_CONTROL_STARTED	0x10 /* the same as trigger */
  #define FSCHMD_WDOG_CONTROL_STOP	0x20
  #define FSCHMD_WDOG_CONTROL_RESOLUTION	0x40
  
  #define FSCHMD_WDOG_STATE_CARDRESET	0x02
  
  /* voltages, weird order is to keep the same order as the old drivers */
  static const u8 FSCHMD_REG_VOLT[7][6] = {
  	{ 0x45, 0x42, 0x48 },				/* pos */
  	{ 0x45, 0x42, 0x48 },				/* her */
  	{ 0x45, 0x42, 0x48 },				/* scy */
  	{ 0x45, 0x42, 0x48 },				/* hrc */
  	{ 0x45, 0x42, 0x48 },				/* hmd */
  	{ 0x21, 0x20, 0x22 },				/* hds */
  	{ 0x21, 0x20, 0x22, 0x23, 0x24, 0x25 },		/* syl */
  };
  
  static const int FSCHMD_NO_VOLT_SENSORS[7] = { 3, 3, 3, 3, 3, 3, 6 };
  
  /*
   * minimum pwm at which the fan is driven (pwm can by increased depending on
   * the temp. Notice that for the scy some fans share there minimum speed.
   * Also notice that with the scy the sensor order is different than with the
   * other chips, this order was in the 2.4 driver and kept for consistency.
   */
  static const u8 FSCHMD_REG_FAN_MIN[7][7] = {
  	{ 0x55, 0x65 },					/* pos */
  	{ 0x55, 0x65, 0xb5 },				/* her */
  	{ 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 },		/* scy */
  	{ 0x55, 0x65, 0xa5, 0xb5 },			/* hrc */
  	{ 0x55, 0x65, 0xa5, 0xb5, 0xc5 },		/* hmd */
  	{ 0x55, 0x65, 0xa5, 0xb5, 0xc5 },		/* hds */
  	{ 0x54, 0x64, 0x74, 0x84, 0x94, 0xa4, 0xb4 },	/* syl */
  };
  
  /* actual fan speed */
  static const u8 FSCHMD_REG_FAN_ACT[7][7] = {
  	{ 0x0e, 0x6b, 0xab },				/* pos */
  	{ 0x0e, 0x6b, 0xbb },				/* her */
  	{ 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb },		/* scy */
  	{ 0x0e, 0x6b, 0xab, 0xbb },			/* hrc */
  	{ 0x5b, 0x6b, 0xab, 0xbb, 0xcb },		/* hmd */
  	{ 0x5b, 0x6b, 0xab, 0xbb, 0xcb },		/* hds */
  	{ 0x57, 0x67, 0x77, 0x87, 0x97, 0xa7, 0xb7 },	/* syl */
  };
  
  /* fan status registers */
  static const u8 FSCHMD_REG_FAN_STATE[7][7] = {
  	{ 0x0d, 0x62, 0xa2 },				/* pos */
  	{ 0x0d, 0x62, 0xb2 },				/* her */
  	{ 0x62, 0x61, 0x0d, 0xa2, 0x52, 0xb2 },		/* scy */
  	{ 0x0d, 0x62, 0xa2, 0xb2 },			/* hrc */
  	{ 0x52, 0x62, 0xa2, 0xb2, 0xc2 },		/* hmd */
  	{ 0x52, 0x62, 0xa2, 0xb2, 0xc2 },		/* hds */
  	{ 0x50, 0x60, 0x70, 0x80, 0x90, 0xa0, 0xb0 },	/* syl */
  };
  
  /* fan ripple / divider registers */
  static const u8 FSCHMD_REG_FAN_RIPPLE[7][7] = {
  	{ 0x0f, 0x6f, 0xaf },				/* pos */
  	{ 0x0f, 0x6f, 0xbf },				/* her */
  	{ 0x6f, 0x6f, 0x0f, 0xaf, 0x0f, 0xbf },		/* scy */
  	{ 0x0f, 0x6f, 0xaf, 0xbf },			/* hrc */
  	{ 0x5f, 0x6f, 0xaf, 0xbf, 0xcf },		/* hmd */
  	{ 0x5f, 0x6f, 0xaf, 0xbf, 0xcf },		/* hds */
  	{ 0x56, 0x66, 0x76, 0x86, 0x96, 0xa6, 0xb6 },	/* syl */
  };
  
  static const int FSCHMD_NO_FAN_SENSORS[7] = { 3, 3, 6, 4, 5, 5, 7 };
  
  /* Fan status register bitmasks */
  #define FSCHMD_FAN_ALARM	0x04 /* called fault by FSC! */
  #define FSCHMD_FAN_NOT_PRESENT	0x08
  #define FSCHMD_FAN_DISABLED	0x80
  
  
  /* actual temperature registers */
  static const u8 FSCHMD_REG_TEMP_ACT[7][11] = {
  	{ 0x64, 0x32, 0x35 },				/* pos */
  	{ 0x64, 0x32, 0x35 },				/* her */
  	{ 0x64, 0xD0, 0x32, 0x35 },			/* scy */
  	{ 0x64, 0x32, 0x35 },				/* hrc */
  	{ 0x70, 0x80, 0x90, 0xd0, 0xe0 },		/* hmd */
  	{ 0x70, 0x80, 0x90, 0xd0, 0xe0 },		/* hds */
  	{ 0x58, 0x68, 0x78, 0x88, 0x98, 0xa8,		/* syl */
  	  0xb8, 0xc8, 0xd8, 0xe8, 0xf8 },
  };
  
  /* temperature state registers */
  static const u8 FSCHMD_REG_TEMP_STATE[7][11] = {
  	{ 0x71, 0x81, 0x91 },				/* pos */
  	{ 0x71, 0x81, 0x91 },				/* her */
  	{ 0x71, 0xd1, 0x81, 0x91 },			/* scy */
  	{ 0x71, 0x81, 0x91 },				/* hrc */
  	{ 0x71, 0x81, 0x91, 0xd1, 0xe1 },		/* hmd */
  	{ 0x71, 0x81, 0x91, 0xd1, 0xe1 },		/* hds */
  	{ 0x59, 0x69, 0x79, 0x89, 0x99, 0xa9,		/* syl */
  	  0xb9, 0xc9, 0xd9, 0xe9, 0xf9 },
  };
  
  /*
   * temperature high limit registers, FSC does not document these. Proven to be
   * there with field testing on the fscher and fschrc, already supported / used
   * in the fscscy 2.4 driver. FSC has confirmed that the fschmd has registers
   * at these addresses, but doesn't want to confirm they are the same as with
   * the fscher??
   */
  static const u8 FSCHMD_REG_TEMP_LIMIT[7][11] = {
  	{ 0, 0, 0 },					/* pos */
  	{ 0x76, 0x86, 0x96 },				/* her */
  	{ 0x76, 0xd6, 0x86, 0x96 },			/* scy */
  	{ 0x76, 0x86, 0x96 },				/* hrc */
  	{ 0x76, 0x86, 0x96, 0xd6, 0xe6 },		/* hmd */
  	{ 0x76, 0x86, 0x96, 0xd6, 0xe6 },		/* hds */
  	{ 0x5a, 0x6a, 0x7a, 0x8a, 0x9a, 0xaa,		/* syl */
  	  0xba, 0xca, 0xda, 0xea, 0xfa },
  };
  
  /*
   * These were found through experimenting with an fscher, currently they are
   * not used, but we keep them around for future reference.
   * On the fscsyl AUTOP1 lives at 0x#c (so 0x5c for fan1, 0x6c for fan2, etc),
   * AUTOP2 lives at 0x#e, and 0x#1 is a bitmask defining which temps influence
   * the fan speed.
   * static const u8 FSCHER_REG_TEMP_AUTOP1[] =	{ 0x73, 0x83, 0x93 };
   * static const u8 FSCHER_REG_TEMP_AUTOP2[] =	{ 0x75, 0x85, 0x95 };
   */
  
  static const int FSCHMD_NO_TEMP_SENSORS[7] = { 3, 3, 4, 3, 5, 5, 11 };
  
  /* temp status register bitmasks */
  #define FSCHMD_TEMP_WORKING	0x01
  #define FSCHMD_TEMP_ALERT	0x02
  #define FSCHMD_TEMP_DISABLED	0x80
  /* there only really is an alarm if the sensor is working and alert == 1 */
  #define FSCHMD_TEMP_ALARM_MASK \
  	(FSCHMD_TEMP_WORKING | FSCHMD_TEMP_ALERT)
  
  /*
   * Functions declarations
   */
  
  static int fschmd_probe(struct i2c_client *client,
  			const struct i2c_device_id *id);
  static int fschmd_detect(struct i2c_client *client,
  			 struct i2c_board_info *info);
  static int fschmd_remove(struct i2c_client *client);
  static struct fschmd_data *fschmd_update_device(struct device *dev);
  
  /*
   * Driver data (common to all clients)
   */
  
  static const struct i2c_device_id fschmd_id[] = {
  	{ "fscpos", fscpos },
  	{ "fscher", fscher },
  	{ "fscscy", fscscy },
  	{ "fschrc", fschrc },
  	{ "fschmd", fschmd },
  	{ "fschds", fschds },
  	{ "fscsyl", fscsyl },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, fschmd_id);
  
  static struct i2c_driver fschmd_driver = {
  	.class		= I2C_CLASS_HWMON,
  	.driver = {
  		.name	= "fschmd",
  	},
  	.probe		= fschmd_probe,
  	.remove		= fschmd_remove,
  	.id_table	= fschmd_id,
  	.detect		= fschmd_detect,
  	.address_list	= normal_i2c,
  };
  
  /*
   * Client data (each client gets its own)
   */
  
  struct fschmd_data {
  	struct i2c_client *client;
  	struct device *hwmon_dev;
  	struct mutex update_lock;
  	struct mutex watchdog_lock;
  	struct list_head list; /* member of the watchdog_data_list */
  	struct kref kref;
  	struct miscdevice watchdog_miscdev;
  	enum chips kind;
  	unsigned long watchdog_is_open;
  	char watchdog_expect_close;
  	char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
  	char valid; /* zero until following fields are valid */
  	unsigned long last_updated; /* in jiffies */
  
  	/* register values */
  	u8 revision;            /* chip revision */
  	u8 global_control;	/* global control register */
  	u8 watchdog_control;    /* watchdog control register */
  	u8 watchdog_state;      /* watchdog status register */
  	u8 watchdog_preset;     /* watchdog counter preset on trigger val */
  	u8 volt[6];		/* voltage */
  	u8 temp_act[11];	/* temperature */
  	u8 temp_status[11];	/* status of sensor */
  	u8 temp_max[11];	/* high temp limit, notice: undocumented! */
  	u8 fan_act[7];		/* fans revolutions per second */
  	u8 fan_status[7];	/* fan status */
  	u8 fan_min[7];		/* fan min value for rps */
  	u8 fan_ripple[7];	/* divider for rps */
  };
  
  /*
   * Global variables to hold information read from special DMI tables, which are
   * available on FSC machines with an fscher or later chip. There is no need to
   * protect these with a lock as they are only modified from our attach function
   * which always gets called with the i2c-core lock held and never accessed
   * before the attach function is done with them.
   */
  static int dmi_mult[6] = { 490, 200, 100, 100, 200, 100 };
  static int dmi_offset[6] = { 0, 0, 0, 0, 0, 0 };
  static int dmi_vref = -1;
  
  /*
   * Somewhat ugly :( global data pointer list with all fschmd devices, so that
   * we can find our device data as when using misc_register there is no other
   * method to get to ones device data from the open fop.
   */
  static LIST_HEAD(watchdog_data_list);
  /* Note this lock not only protect list access, but also data.kref access */
  static DEFINE_MUTEX(watchdog_data_mutex);
  
  /*
   * Release our data struct when we're detached from the i2c client *and* all
   * references to our watchdog device are released
   */
  static void fschmd_release_resources(struct kref *ref)
  {
  	struct fschmd_data *data = container_of(ref, struct fschmd_data, kref);
  	kfree(data);
  }
  
  /*
   * Sysfs attr show / store functions
   */
  
  static ssize_t show_in_value(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	const int max_reading[3] = { 14200, 6600, 3300 };
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	if (data->kind == fscher || data->kind >= fschrc)
  		return sprintf(buf, "%d
  ", (data->volt[index] * dmi_vref *
  			dmi_mult[index]) / 255 + dmi_offset[index]);
  	else
  		return sprintf(buf, "%d
  ", (data->volt[index] *
  			max_reading[index] + 128) / 255);
  }
  
  
  #define TEMP_FROM_REG(val)	(((val) - 128) * 1000)
  
  static ssize_t show_temp_value(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_act[index]));
  }
  
  static ssize_t show_temp_max(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_max[index]));
  }
  
  static ssize_t store_temp_max(struct device *dev, struct device_attribute
  	*devattr, const char *buf, size_t count)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = dev_get_drvdata(dev);
  	long v;
  	int err;
  
  	err = kstrtol(buf, 10, &v);
  	if (err)
  		return err;
  
  	v = clamp_val(v / 1000, -128, 127) + 128;
  
  	mutex_lock(&data->update_lock);
  	i2c_smbus_write_byte_data(to_i2c_client(dev),
  		FSCHMD_REG_TEMP_LIMIT[data->kind][index], v);
  	data->temp_max[index] = v;
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t show_temp_fault(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	/* bit 0 set means sensor working ok, so no fault! */
  	if (data->temp_status[index] & FSCHMD_TEMP_WORKING)
  		return sprintf(buf, "0
  ");
  	else
  		return sprintf(buf, "1
  ");
  }
  
  static ssize_t show_temp_alarm(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	if ((data->temp_status[index] & FSCHMD_TEMP_ALARM_MASK) ==
  			FSCHMD_TEMP_ALARM_MASK)
  		return sprintf(buf, "1
  ");
  	else
  		return sprintf(buf, "0
  ");
  }
  
  
  #define RPM_FROM_REG(val)	((val) * 60)
  
  static ssize_t show_fan_value(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	return sprintf(buf, "%u
  ", RPM_FROM_REG(data->fan_act[index]));
  }
  
  static ssize_t show_fan_div(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	/* bits 2..7 reserved => mask with 3 */
  	return sprintf(buf, "%d
  ", 1 << (data->fan_ripple[index] & 3));
  }
  
  static ssize_t store_fan_div(struct device *dev, struct device_attribute
  	*devattr, const char *buf, size_t count)
  {
  	u8 reg;
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = dev_get_drvdata(dev);
  	/* supported values: 2, 4, 8 */
  	unsigned long v;
  	int err;
  
  	err = kstrtoul(buf, 10, &v);
  	if (err)
  		return err;
  
  	switch (v) {
  	case 2:
  		v = 1;
  		break;
  	case 4:
  		v = 2;
  		break;
  	case 8:
  		v = 3;
  		break;
  	default:
  		dev_err(dev,
  			"fan_div value %lu not supported. Choose one of 2, 4 or 8!
  ",
  			v);
  		return -EINVAL;
  	}
  
  	mutex_lock(&data->update_lock);
  
  	reg = i2c_smbus_read_byte_data(to_i2c_client(dev),
  		FSCHMD_REG_FAN_RIPPLE[data->kind][index]);
  
  	/* bits 2..7 reserved => mask with 0x03 */
  	reg &= ~0x03;
  	reg |= v;
  
  	i2c_smbus_write_byte_data(to_i2c_client(dev),
  		FSCHMD_REG_FAN_RIPPLE[data->kind][index], reg);
  
  	data->fan_ripple[index] = reg;
  
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t show_fan_alarm(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	if (data->fan_status[index] & FSCHMD_FAN_ALARM)
  		return sprintf(buf, "1
  ");
  	else
  		return sprintf(buf, "0
  ");
  }
  
  static ssize_t show_fan_fault(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	if (data->fan_status[index] & FSCHMD_FAN_NOT_PRESENT)
  		return sprintf(buf, "1
  ");
  	else
  		return sprintf(buf, "0
  ");
  }
  
  
  static ssize_t show_pwm_auto_point1_pwm(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = fschmd_update_device(dev);
  	int val = data->fan_min[index];
  
  	/* 0 = allow turning off (except on the syl), 1-255 = 50-100% */
  	if (val || data->kind == fscsyl)
  		val = val / 2 + 128;
  
  	return sprintf(buf, "%d
  ", val);
  }
  
  static ssize_t store_pwm_auto_point1_pwm(struct device *dev,
  	struct device_attribute *devattr, const char *buf, size_t count)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct fschmd_data *data = dev_get_drvdata(dev);
  	unsigned long v;
  	int err;
  
  	err = kstrtoul(buf, 10, &v);
  	if (err)
  		return err;
  
  	/* reg: 0 = allow turning off (except on the syl), 1-255 = 50-100% */
  	if (v || data->kind == fscsyl) {
  		v = clamp_val(v, 128, 255);
  		v = (v - 128) * 2 + 1;
  	}
  
  	mutex_lock(&data->update_lock);
  
  	i2c_smbus_write_byte_data(to_i2c_client(dev),
  		FSCHMD_REG_FAN_MIN[data->kind][index], v);
  	data->fan_min[index] = v;
  
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  
  /*
   * The FSC hwmon family has the ability to force an attached alert led to flash
   * from software, we export this as an alert_led sysfs attr
   */
  static ssize_t show_alert_led(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	struct fschmd_data *data = fschmd_update_device(dev);
  
  	if (data->global_control & FSCHMD_CONTROL_ALERT_LED)
  		return sprintf(buf, "1
  ");
  	else
  		return sprintf(buf, "0
  ");
  }
  
  static ssize_t store_alert_led(struct device *dev,
  	struct device_attribute *devattr, const char *buf, size_t count)
  {
  	u8 reg;
  	struct fschmd_data *data = dev_get_drvdata(dev);
  	unsigned long v;
  	int err;
  
  	err = kstrtoul(buf, 10, &v);
  	if (err)
  		return err;
  
  	mutex_lock(&data->update_lock);
  
  	reg = i2c_smbus_read_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL);
  
  	if (v)
  		reg |= FSCHMD_CONTROL_ALERT_LED;
  	else
  		reg &= ~FSCHMD_CONTROL_ALERT_LED;
  
  	i2c_smbus_write_byte_data(to_i2c_client(dev), FSCHMD_REG_CONTROL, reg);
  
  	data->global_control = reg;
  
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static DEVICE_ATTR(alert_led, 0644, show_alert_led, store_alert_led);
  
  static struct sensor_device_attribute fschmd_attr[] = {
  	SENSOR_ATTR(in0_input, 0444, show_in_value, NULL, 0),
  	SENSOR_ATTR(in1_input, 0444, show_in_value, NULL, 1),
  	SENSOR_ATTR(in2_input, 0444, show_in_value, NULL, 2),
  	SENSOR_ATTR(in3_input, 0444, show_in_value, NULL, 3),
  	SENSOR_ATTR(in4_input, 0444, show_in_value, NULL, 4),
  	SENSOR_ATTR(in5_input, 0444, show_in_value, NULL, 5),
  };
  
  static struct sensor_device_attribute fschmd_temp_attr[] = {
  	SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
  	SENSOR_ATTR(temp1_max,   0644, show_temp_max, store_temp_max, 0),
  	SENSOR_ATTR(temp1_fault, 0444, show_temp_fault, NULL, 0),
  	SENSOR_ATTR(temp1_alarm, 0444, show_temp_alarm, NULL, 0),
  	SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
  	SENSOR_ATTR(temp2_max,   0644, show_temp_max, store_temp_max, 1),
  	SENSOR_ATTR(temp2_fault, 0444, show_temp_fault, NULL, 1),
  	SENSOR_ATTR(temp2_alarm, 0444, show_temp_alarm, NULL, 1),
  	SENSOR_ATTR(temp3_input, 0444, show_temp_value, NULL, 2),
  	SENSOR_ATTR(temp3_max,   0644, show_temp_max, store_temp_max, 2),
  	SENSOR_ATTR(temp3_fault, 0444, show_temp_fault, NULL, 2),
  	SENSOR_ATTR(temp3_alarm, 0444, show_temp_alarm, NULL, 2),
  	SENSOR_ATTR(temp4_input, 0444, show_temp_value, NULL, 3),
  	SENSOR_ATTR(temp4_max,   0644, show_temp_max, store_temp_max, 3),
  	SENSOR_ATTR(temp4_fault, 0444, show_temp_fault, NULL, 3),
  	SENSOR_ATTR(temp4_alarm, 0444, show_temp_alarm, NULL, 3),
  	SENSOR_ATTR(temp5_input, 0444, show_temp_value, NULL, 4),
  	SENSOR_ATTR(temp5_max,   0644, show_temp_max, store_temp_max, 4),
  	SENSOR_ATTR(temp5_fault, 0444, show_temp_fault, NULL, 4),
  	SENSOR_ATTR(temp5_alarm, 0444, show_temp_alarm, NULL, 4),
  	SENSOR_ATTR(temp6_input, 0444, show_temp_value, NULL, 5),
  	SENSOR_ATTR(temp6_max,   0644, show_temp_max, store_temp_max, 5),
  	SENSOR_ATTR(temp6_fault, 0444, show_temp_fault, NULL, 5),
  	SENSOR_ATTR(temp6_alarm, 0444, show_temp_alarm, NULL, 5),
  	SENSOR_ATTR(temp7_input, 0444, show_temp_value, NULL, 6),
  	SENSOR_ATTR(temp7_max,   0644, show_temp_max, store_temp_max, 6),
  	SENSOR_ATTR(temp7_fault, 0444, show_temp_fault, NULL, 6),
  	SENSOR_ATTR(temp7_alarm, 0444, show_temp_alarm, NULL, 6),
  	SENSOR_ATTR(temp8_input, 0444, show_temp_value, NULL, 7),
  	SENSOR_ATTR(temp8_max,   0644, show_temp_max, store_temp_max, 7),
  	SENSOR_ATTR(temp8_fault, 0444, show_temp_fault, NULL, 7),
  	SENSOR_ATTR(temp8_alarm, 0444, show_temp_alarm, NULL, 7),
  	SENSOR_ATTR(temp9_input, 0444, show_temp_value, NULL, 8),
  	SENSOR_ATTR(temp9_max,   0644, show_temp_max, store_temp_max, 8),
  	SENSOR_ATTR(temp9_fault, 0444, show_temp_fault, NULL, 8),
  	SENSOR_ATTR(temp9_alarm, 0444, show_temp_alarm, NULL, 8),
  	SENSOR_ATTR(temp10_input, 0444, show_temp_value, NULL, 9),
  	SENSOR_ATTR(temp10_max,   0644, show_temp_max, store_temp_max, 9),
  	SENSOR_ATTR(temp10_fault, 0444, show_temp_fault, NULL, 9),
  	SENSOR_ATTR(temp10_alarm, 0444, show_temp_alarm, NULL, 9),
  	SENSOR_ATTR(temp11_input, 0444, show_temp_value, NULL, 10),
  	SENSOR_ATTR(temp11_max,   0644, show_temp_max, store_temp_max, 10),
  	SENSOR_ATTR(temp11_fault, 0444, show_temp_fault, NULL, 10),
  	SENSOR_ATTR(temp11_alarm, 0444, show_temp_alarm, NULL, 10),
  };
  
  static struct sensor_device_attribute fschmd_fan_attr[] = {
  	SENSOR_ATTR(fan1_input, 0444, show_fan_value, NULL, 0),
  	SENSOR_ATTR(fan1_div,   0644, show_fan_div, store_fan_div, 0),
  	SENSOR_ATTR(fan1_alarm, 0444, show_fan_alarm, NULL, 0),
  	SENSOR_ATTR(fan1_fault, 0444, show_fan_fault, NULL, 0),
  	SENSOR_ATTR(pwm1_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 0),
  	SENSOR_ATTR(fan2_input, 0444, show_fan_value, NULL, 1),
  	SENSOR_ATTR(fan2_div,   0644, show_fan_div, store_fan_div, 1),
  	SENSOR_ATTR(fan2_alarm, 0444, show_fan_alarm, NULL, 1),
  	SENSOR_ATTR(fan2_fault, 0444, show_fan_fault, NULL, 1),
  	SENSOR_ATTR(pwm2_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 1),
  	SENSOR_ATTR(fan3_input, 0444, show_fan_value, NULL, 2),
  	SENSOR_ATTR(fan3_div,   0644, show_fan_div, store_fan_div, 2),
  	SENSOR_ATTR(fan3_alarm, 0444, show_fan_alarm, NULL, 2),
  	SENSOR_ATTR(fan3_fault, 0444, show_fan_fault, NULL, 2),
  	SENSOR_ATTR(pwm3_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 2),
  	SENSOR_ATTR(fan4_input, 0444, show_fan_value, NULL, 3),
  	SENSOR_ATTR(fan4_div,   0644, show_fan_div, store_fan_div, 3),
  	SENSOR_ATTR(fan4_alarm, 0444, show_fan_alarm, NULL, 3),
  	SENSOR_ATTR(fan4_fault, 0444, show_fan_fault, NULL, 3),
  	SENSOR_ATTR(pwm4_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 3),
  	SENSOR_ATTR(fan5_input, 0444, show_fan_value, NULL, 4),
  	SENSOR_ATTR(fan5_div,   0644, show_fan_div, store_fan_div, 4),
  	SENSOR_ATTR(fan5_alarm, 0444, show_fan_alarm, NULL, 4),
  	SENSOR_ATTR(fan5_fault, 0444, show_fan_fault, NULL, 4),
  	SENSOR_ATTR(pwm5_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 4),
  	SENSOR_ATTR(fan6_input, 0444, show_fan_value, NULL, 5),
  	SENSOR_ATTR(fan6_div,   0644, show_fan_div, store_fan_div, 5),
  	SENSOR_ATTR(fan6_alarm, 0444, show_fan_alarm, NULL, 5),
  	SENSOR_ATTR(fan6_fault, 0444, show_fan_fault, NULL, 5),
  	SENSOR_ATTR(pwm6_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 5),
  	SENSOR_ATTR(fan7_input, 0444, show_fan_value, NULL, 6),
  	SENSOR_ATTR(fan7_div,   0644, show_fan_div, store_fan_div, 6),
  	SENSOR_ATTR(fan7_alarm, 0444, show_fan_alarm, NULL, 6),
  	SENSOR_ATTR(fan7_fault, 0444, show_fan_fault, NULL, 6),
  	SENSOR_ATTR(pwm7_auto_point1_pwm, 0644, show_pwm_auto_point1_pwm,
  		store_pwm_auto_point1_pwm, 6),
  };
  
  
  /*
   * Watchdog routines
   */
  
  static int watchdog_set_timeout(struct fschmd_data *data, int timeout)
  {
  	int ret, resolution;
  	int kind = data->kind + 1; /* 0-x array index -> 1-x module param */
  
  	/* 2 second or 60 second resolution? */
  	if (timeout <= 510 || kind == fscpos || kind == fscscy)
  		resolution = 2;
  	else
  		resolution = 60;
  
  	if (timeout < resolution || timeout > (resolution * 255))
  		return -EINVAL;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	if (resolution == 2)
  		data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_RESOLUTION;
  	else
  		data->watchdog_control |= FSCHMD_WDOG_CONTROL_RESOLUTION;
  
  	data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
  
  	/* Write new timeout value */
  	i2c_smbus_write_byte_data(data->client,
  		FSCHMD_REG_WDOG_PRESET[data->kind], data->watchdog_preset);
  	/* Write new control register, do not trigger! */
  	i2c_smbus_write_byte_data(data->client,
  		FSCHMD_REG_WDOG_CONTROL[data->kind],
  		data->watchdog_control & ~FSCHMD_WDOG_CONTROL_TRIGGER);
  
  	ret = data->watchdog_preset * resolution;
  
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_get_timeout(struct fschmd_data *data)
  {
  	int timeout;
  
  	mutex_lock(&data->watchdog_lock);
  	if (data->watchdog_control & FSCHMD_WDOG_CONTROL_RESOLUTION)
  		timeout = data->watchdog_preset * 60;
  	else
  		timeout = data->watchdog_preset * 2;
  	mutex_unlock(&data->watchdog_lock);
  
  	return timeout;
  }
  
  static int watchdog_trigger(struct fschmd_data *data)
  {
  	int ret = 0;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	data->watchdog_control |= FSCHMD_WDOG_CONTROL_TRIGGER;
  	i2c_smbus_write_byte_data(data->client,
  				  FSCHMD_REG_WDOG_CONTROL[data->kind],
  				  data->watchdog_control);
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_stop(struct fschmd_data *data)
  {
  	int ret = 0;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	data->watchdog_control &= ~FSCHMD_WDOG_CONTROL_STARTED;
  	/*
  	 * Don't store the stop flag in our watchdog control register copy, as
  	 * its a write only bit (read always returns 0)
  	 */
  	i2c_smbus_write_byte_data(data->client,
  		FSCHMD_REG_WDOG_CONTROL[data->kind],
  		data->watchdog_control | FSCHMD_WDOG_CONTROL_STOP);
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_open(struct inode *inode, struct file *filp)
  {
  	struct fschmd_data *pos, *data = NULL;
  	int watchdog_is_open;
  
  	/*
  	 * We get called from drivers/char/misc.c with misc_mtx hold, and we
  	 * call misc_register() from fschmd_probe() with watchdog_data_mutex
  	 * hold, as misc_register() takes the misc_mtx lock, this is a possible
  	 * deadlock, so we use mutex_trylock here.
  	 */
  	if (!mutex_trylock(&watchdog_data_mutex))
  		return -ERESTARTSYS;
  	list_for_each_entry(pos, &watchdog_data_list, list) {
  		if (pos->watchdog_miscdev.minor == iminor(inode)) {
  			data = pos;
  			break;
  		}
  	}
  	/* Note we can never not have found data, so we don't check for this */
  	watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
  	if (!watchdog_is_open)
  		kref_get(&data->kref);
  	mutex_unlock(&watchdog_data_mutex);
  
  	if (watchdog_is_open)
  		return -EBUSY;
  
  	/* Start the watchdog */
  	watchdog_trigger(data);
  	filp->private_data = data;
  
  	return nonseekable_open(inode, filp);
  }
  
  static int watchdog_release(struct inode *inode, struct file *filp)
  {
  	struct fschmd_data *data = filp->private_data;
  
  	if (data->watchdog_expect_close) {
  		watchdog_stop(data);
  		data->watchdog_expect_close = 0;
  	} else {
  		watchdog_trigger(data);
  		dev_crit(&data->client->dev,
  			"unexpected close, not stopping watchdog!
  ");
  	}
  
  	clear_bit(0, &data->watchdog_is_open);
  
  	mutex_lock(&watchdog_data_mutex);
  	kref_put(&data->kref, fschmd_release_resources);
  	mutex_unlock(&watchdog_data_mutex);
  
  	return 0;
  }
  
  static ssize_t watchdog_write(struct file *filp, const char __user *buf,
  	size_t count, loff_t *offset)
  {
  	int ret;
  	struct fschmd_data *data = filp->private_data;
  
  	if (count) {
  		if (!nowayout) {
  			size_t i;
  
  			/* Clear it in case it was set with a previous write */
  			data->watchdog_expect_close = 0;
  
  			for (i = 0; i != count; i++) {
  				char c;
  				if (get_user(c, buf + i))
  					return -EFAULT;
  				if (c == 'V')
  					data->watchdog_expect_close = 1;
  			}
  		}
  		ret = watchdog_trigger(data);
  		if (ret < 0)
  			return ret;
  	}
  	return count;
  }
  
  static long watchdog_ioctl(struct file *filp, unsigned int cmd,
  			   unsigned long arg)
  {
  	struct watchdog_info ident = {
  		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
  				WDIOF_CARDRESET,
  		.identity = "FSC watchdog"
  	};
  	int i, ret = 0;
  	struct fschmd_data *data = filp->private_data;
  
  	switch (cmd) {
  	case WDIOC_GETSUPPORT:
  		ident.firmware_version = data->revision;
  		if (!nowayout)
  			ident.options |= WDIOF_MAGICCLOSE;
  		if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
  			ret = -EFAULT;
  		break;
  
  	case WDIOC_GETSTATUS:
  		ret = put_user(0, (int __user *)arg);
  		break;
  
  	case WDIOC_GETBOOTSTATUS:
  		if (data->watchdog_state & FSCHMD_WDOG_STATE_CARDRESET)
  			ret = put_user(WDIOF_CARDRESET, (int __user *)arg);
  		else
  			ret = put_user(0, (int __user *)arg);
  		break;
  
  	case WDIOC_KEEPALIVE:
  		ret = watchdog_trigger(data);
  		break;
  
  	case WDIOC_GETTIMEOUT:
  		i = watchdog_get_timeout(data);
  		ret = put_user(i, (int __user *)arg);
  		break;
  
  	case WDIOC_SETTIMEOUT:
  		if (get_user(i, (int __user *)arg)) {
  			ret = -EFAULT;
  			break;
  		}
  		ret = watchdog_set_timeout(data, i);
  		if (ret > 0)
  			ret = put_user(ret, (int __user *)arg);
  		break;
  
  	case WDIOC_SETOPTIONS:
  		if (get_user(i, (int __user *)arg)) {
  			ret = -EFAULT;
  			break;
  		}
  
  		if (i & WDIOS_DISABLECARD)
  			ret = watchdog_stop(data);
  		else if (i & WDIOS_ENABLECARD)
  			ret = watchdog_trigger(data);
  		else
  			ret = -EINVAL;
  
  		break;
  	default:
  		ret = -ENOTTY;
  	}
  	return ret;
  }
  
  static const struct file_operations watchdog_fops = {
  	.owner = THIS_MODULE,
  	.llseek = no_llseek,
  	.open = watchdog_open,
  	.release = watchdog_release,
  	.write = watchdog_write,
  	.unlocked_ioctl = watchdog_ioctl,
  };
  
  
  /*
   * Detect, register, unregister and update device functions
   */
  
  /*
   * DMI decode routine to read voltage scaling factors from special DMI tables,
   * which are available on FSC machines with an fscher or later chip.
   */
  static void fschmd_dmi_decode(const struct dmi_header *header, void *dummy)
  {
  	int i, mult[3] = { 0 }, offset[3] = { 0 }, vref = 0, found = 0;
  
  	/*
  	 * dmi code ugliness, we get passed the address of the contents of
  	 * a complete DMI record, but in the form of a dmi_header pointer, in
  	 * reality this address holds header->length bytes of which the header
  	 * are the first 4 bytes
  	 */
  	u8 *dmi_data = (u8 *)header;
  
  	/* We are looking for OEM-specific type 185 */
  	if (header->type != 185)
  		return;
  
  	/*
  	 * we are looking for what Siemens calls "subtype" 19, the subtype
  	 * is stored in byte 5 of the dmi block
  	 */
  	if (header->length < 5 || dmi_data[4] != 19)
  		return;
  
  	/*
  	 * After the subtype comes 1 unknown byte and then blocks of 5 bytes,
  	 * consisting of what Siemens calls an "Entity" number, followed by
  	 * 2 16-bit words in LSB first order
  	 */
  	for (i = 6; (i + 4) < header->length; i += 5) {
  		/* entity 1 - 3: voltage multiplier and offset */
  		if (dmi_data[i] >= 1 && dmi_data[i] <= 3) {
  			/* Our in sensors order and the DMI order differ */
  			const int shuffle[3] = { 1, 0, 2 };
  			int in = shuffle[dmi_data[i] - 1];
  
  			/* Check for twice the same entity */
  			if (found & (1 << in))
  				return;
  
  			mult[in] = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
  			offset[in] = dmi_data[i + 3] | (dmi_data[i + 4] << 8);
  
  			found |= 1 << in;
  		}
  
  		/* entity 7: reference voltage */
  		if (dmi_data[i] == 7) {
  			/* Check for twice the same entity */
  			if (found & 0x08)
  				return;
  
  			vref = dmi_data[i + 1] | (dmi_data[i + 2] << 8);
  
  			found |= 0x08;
  		}
  	}
  
  	if (found == 0x0F) {
  		for (i = 0; i < 3; i++) {
  			dmi_mult[i] = mult[i] * 10;
  			dmi_offset[i] = offset[i] * 10;
  		}
  		/*
  		 * According to the docs there should be separate dmi entries
  		 * for the mult's and offsets of in3-5 of the syl, but on
  		 * my test machine these are not present
  		 */
  		dmi_mult[3] = dmi_mult[2];
  		dmi_mult[4] = dmi_mult[1];
  		dmi_mult[5] = dmi_mult[2];
  		dmi_offset[3] = dmi_offset[2];
  		dmi_offset[4] = dmi_offset[1];
  		dmi_offset[5] = dmi_offset[2];
  		dmi_vref = vref;
  	}
  }
  
  static int fschmd_detect(struct i2c_client *client,
  			 struct i2c_board_info *info)
  {
  	enum chips kind;
  	struct i2c_adapter *adapter = client->adapter;
  	char id[4];
  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  
  	/* Detect & Identify the chip */
  	id[0] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_0);
  	id[1] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_1);
  	id[2] = i2c_smbus_read_byte_data(client, FSCHMD_REG_IDENT_2);
  	id[3] = '\0';
  
  	if (!strcmp(id, "PEG"))
  		kind = fscpos;
  	else if (!strcmp(id, "HER"))
  		kind = fscher;
  	else if (!strcmp(id, "SCY"))
  		kind = fscscy;
  	else if (!strcmp(id, "HRC"))
  		kind = fschrc;
  	else if (!strcmp(id, "HMD"))
  		kind = fschmd;
  	else if (!strcmp(id, "HDS"))
  		kind = fschds;
  	else if (!strcmp(id, "SYL"))
  		kind = fscsyl;
  	else
  		return -ENODEV;
  
  	strlcpy(info->type, fschmd_id[kind].name, I2C_NAME_SIZE);
  
  	return 0;
  }
  
  static int fschmd_probe(struct i2c_client *client,
  			const struct i2c_device_id *id)
  {
  	struct fschmd_data *data;
  	const char * const names[7] = { "Poseidon", "Hermes", "Scylla",
  				"Heracles", "Heimdall", "Hades", "Syleus" };
  	const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
  	int i, err;
  	enum chips kind = id->driver_data;
  
  	data = kzalloc(sizeof(struct fschmd_data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;
  
  	i2c_set_clientdata(client, data);
  	mutex_init(&data->update_lock);
  	mutex_init(&data->watchdog_lock);
  	INIT_LIST_HEAD(&data->list);
  	kref_init(&data->kref);
  	/*
  	 * Store client pointer in our data struct for watchdog usage
  	 * (where the client is found through a data ptr instead of the
  	 * otherway around)
  	 */
  	data->client = client;
  	data->kind = kind;
  
  	if (kind == fscpos) {
  		/*
  		 * The Poseidon has hardwired temp limits, fill these
  		 * in for the alarm resetting code
  		 */
  		data->temp_max[0] = 70 + 128;
  		data->temp_max[1] = 50 + 128;
  		data->temp_max[2] = 50 + 128;
  	}
  
  	/* Read the special DMI table for fscher and newer chips */
  	if ((kind == fscher || kind >= fschrc) && dmi_vref == -1) {
  		dmi_walk(fschmd_dmi_decode, NULL);
  		if (dmi_vref == -1) {
  			dev_warn(&client->dev,
  				"Couldn't get voltage scaling factors from "
  				"BIOS DMI table, using builtin defaults
  ");
  			dmi_vref = 33;
  		}
  	}
  
  	/* Read in some never changing registers */
  	data->revision = i2c_smbus_read_byte_data(client, FSCHMD_REG_REVISION);
  	data->global_control = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_CONTROL);
  	data->watchdog_control = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_WDOG_CONTROL[data->kind]);
  	data->watchdog_state = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_WDOG_STATE[data->kind]);
  	data->watchdog_preset = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_WDOG_PRESET[data->kind]);
  
  	err = device_create_file(&client->dev, &dev_attr_alert_led);
  	if (err)
  		goto exit_detach;
  
  	for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++) {
  		err = device_create_file(&client->dev,
  					&fschmd_attr[i].dev_attr);
  		if (err)
  			goto exit_detach;
  	}
  
  	for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++) {
  		/* Poseidon doesn't have TEMP_LIMIT registers */
  		if (kind == fscpos && fschmd_temp_attr[i].dev_attr.show ==
  				show_temp_max)
  			continue;
  
  		if (kind == fscsyl) {
  			if (i % 4 == 0)
  				data->temp_status[i / 4] =
  					i2c_smbus_read_byte_data(client,
  						FSCHMD_REG_TEMP_STATE
  						[data->kind][i / 4]);
  			if (data->temp_status[i / 4] & FSCHMD_TEMP_DISABLED)
  				continue;
  		}
  
  		err = device_create_file(&client->dev,
  					&fschmd_temp_attr[i].dev_attr);
  		if (err)
  			goto exit_detach;
  	}
  
  	for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++) {
  		/* Poseidon doesn't have a FAN_MIN register for its 3rd fan */
  		if (kind == fscpos &&
  				!strcmp(fschmd_fan_attr[i].dev_attr.attr.name,
  					"pwm3_auto_point1_pwm"))
  			continue;
  
  		if (kind == fscsyl) {
  			if (i % 5 == 0)
  				data->fan_status[i / 5] =
  					i2c_smbus_read_byte_data(client,
  						FSCHMD_REG_FAN_STATE
  						[data->kind][i / 5]);
  			if (data->fan_status[i / 5] & FSCHMD_FAN_DISABLED)
  				continue;
  		}
  
  		err = device_create_file(&client->dev,
  					&fschmd_fan_attr[i].dev_attr);
  		if (err)
  			goto exit_detach;
  	}
  
  	data->hwmon_dev = hwmon_device_register(&client->dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);
  		data->hwmon_dev = NULL;
  		goto exit_detach;
  	}
  
  	/*
  	 * We take the data_mutex lock early so that watchdog_open() cannot
  	 * run when misc_register() has completed, but we've not yet added
  	 * our data to the watchdog_data_list (and set the default timeout)
  	 */
  	mutex_lock(&watchdog_data_mutex);
  	for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
  		/* Register our watchdog part */
  		snprintf(data->watchdog_name, sizeof(data->watchdog_name),
  			"watchdog%c", (i == 0) ? '\0' : ('0' + i));
  		data->watchdog_miscdev.name = data->watchdog_name;
  		data->watchdog_miscdev.fops = &watchdog_fops;
  		data->watchdog_miscdev.minor = watchdog_minors[i];
  		err = misc_register(&data->watchdog_miscdev);
  		if (err == -EBUSY)
  			continue;
  		if (err) {
  			data->watchdog_miscdev.minor = 0;
  			dev_err(&client->dev,
  				"Registering watchdog chardev: %d
  ", err);
  			break;
  		}
  
  		list_add(&data->list, &watchdog_data_list);
  		watchdog_set_timeout(data, 60);
  		dev_info(&client->dev,
  			"Registered watchdog chardev major 10, minor: %d
  ",
  			watchdog_minors[i]);
  		break;
  	}
  	if (i == ARRAY_SIZE(watchdog_minors)) {
  		data->watchdog_miscdev.minor = 0;
  		dev_warn(&client->dev,
  			 "Couldn't register watchdog chardev (due to no free minor)
  ");
  	}
  	mutex_unlock(&watchdog_data_mutex);
  
  	dev_info(&client->dev, "Detected FSC %s chip, revision: %d
  ",
  		names[data->kind], (int) data->revision);
  
  	return 0;
  
  exit_detach:
  	fschmd_remove(client); /* will also free data for us */
  	return err;
  }
  
  static int fschmd_remove(struct i2c_client *client)
  {
  	struct fschmd_data *data = i2c_get_clientdata(client);
  	int i;
  
  	/* Unregister the watchdog (if registered) */
  	if (data->watchdog_miscdev.minor) {
  		misc_deregister(&data->watchdog_miscdev);
  		if (data->watchdog_is_open) {
  			dev_warn(&client->dev,
  				"i2c client detached with watchdog open! "
  				"Stopping watchdog.
  ");
  			watchdog_stop(data);
  		}
  		mutex_lock(&watchdog_data_mutex);
  		list_del(&data->list);
  		mutex_unlock(&watchdog_data_mutex);
  		/* Tell the watchdog code the client is gone */
  		mutex_lock(&data->watchdog_lock);
  		data->client = NULL;
  		mutex_unlock(&data->watchdog_lock);
  	}
  
  	/*
  	 * Check if registered in case we're called from fschmd_detect
  	 * to cleanup after an error
  	 */
  	if (data->hwmon_dev)
  		hwmon_device_unregister(data->hwmon_dev);
  
  	device_remove_file(&client->dev, &dev_attr_alert_led);
  	for (i = 0; i < (FSCHMD_NO_VOLT_SENSORS[data->kind]); i++)
  		device_remove_file(&client->dev, &fschmd_attr[i].dev_attr);
  	for (i = 0; i < (FSCHMD_NO_TEMP_SENSORS[data->kind] * 4); i++)
  		device_remove_file(&client->dev,
  					&fschmd_temp_attr[i].dev_attr);
  	for (i = 0; i < (FSCHMD_NO_FAN_SENSORS[data->kind] * 5); i++)
  		device_remove_file(&client->dev,
  					&fschmd_fan_attr[i].dev_attr);
  
  	mutex_lock(&watchdog_data_mutex);
  	kref_put(&data->kref, fschmd_release_resources);
  	mutex_unlock(&watchdog_data_mutex);
  
  	return 0;
  }
  
  static struct fschmd_data *fschmd_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct fschmd_data *data = i2c_get_clientdata(client);
  	int i;
  
  	mutex_lock(&data->update_lock);
  
  	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
  
  		for (i = 0; i < FSCHMD_NO_TEMP_SENSORS[data->kind]; i++) {
  			data->temp_act[i] = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_TEMP_ACT[data->kind][i]);
  			data->temp_status[i] = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_TEMP_STATE[data->kind][i]);
  
  			/* The fscpos doesn't have TEMP_LIMIT registers */
  			if (FSCHMD_REG_TEMP_LIMIT[data->kind][i])
  				data->temp_max[i] = i2c_smbus_read_byte_data(
  					client,
  					FSCHMD_REG_TEMP_LIMIT[data->kind][i]);
  
  			/*
  			 * reset alarm if the alarm condition is gone,
  			 * the chip doesn't do this itself
  			 */
  			if ((data->temp_status[i] & FSCHMD_TEMP_ALARM_MASK) ==
  					FSCHMD_TEMP_ALARM_MASK &&
  					data->temp_act[i] < data->temp_max[i])
  				i2c_smbus_write_byte_data(client,
  					FSCHMD_REG_TEMP_STATE[data->kind][i],
  					data->temp_status[i]);
  		}
  
  		for (i = 0; i < FSCHMD_NO_FAN_SENSORS[data->kind]; i++) {
  			data->fan_act[i] = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_FAN_ACT[data->kind][i]);
  			data->fan_status[i] = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_FAN_STATE[data->kind][i]);
  			data->fan_ripple[i] = i2c_smbus_read_byte_data(client,
  					FSCHMD_REG_FAN_RIPPLE[data->kind][i]);
  
  			/* The fscpos third fan doesn't have a fan_min */
  			if (FSCHMD_REG_FAN_MIN[data->kind][i])
  				data->fan_min[i] = i2c_smbus_read_byte_data(
  					client,
  					FSCHMD_REG_FAN_MIN[data->kind][i]);
  
  			/* reset fan status if speed is back to > 0 */
  			if ((data->fan_status[i] & FSCHMD_FAN_ALARM) &&
  					data->fan_act[i])
  				i2c_smbus_write_byte_data(client,
  					FSCHMD_REG_FAN_STATE[data->kind][i],
  					data->fan_status[i]);
  		}
  
  		for (i = 0; i < FSCHMD_NO_VOLT_SENSORS[data->kind]; i++)
  			data->volt[i] = i2c_smbus_read_byte_data(client,
  					       FSCHMD_REG_VOLT[data->kind][i]);
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}
  
  	mutex_unlock(&data->update_lock);
  
  	return data;
  }
  
  module_i2c_driver(fschmd_driver);
  
  MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  MODULE_DESCRIPTION("FSC Poseidon, Hermes, Scylla, Heracles, Heimdall, Hades "
  			"and Syleus driver");
  MODULE_LICENSE("GPL");