/***************************************************************************

   *   Copyright (C) 2010-2012 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.,                                       *
   *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
   ***************************************************************************/
  
  #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 "sch56xx-common.h"

  
  #define DRVNAME "sch5627"
  #define DEVNAME DRVNAME /* We only support one model */

  #define SCH5627_HWMON_ID		0xa5
  #define SCH5627_COMPANY_ID		0x5c
  #define SCH5627_PRIMARY_ID		0xa0
  
  #define SCH5627_REG_BUILD_CODE		0x39
  #define SCH5627_REG_BUILD_ID		0x3a
  #define SCH5627_REG_HWMON_ID		0x3c
  #define SCH5627_REG_HWMON_REV		0x3d
  #define SCH5627_REG_COMPANY_ID		0x3e
  #define SCH5627_REG_PRIMARY_ID		0x3f
  #define SCH5627_REG_CTRL		0x40
  
  #define SCH5627_NO_TEMPS		8
  #define SCH5627_NO_FANS			4
  #define SCH5627_NO_IN			5
  
  static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
  	0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
  static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
  	0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
  static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
  	0, 0, 1, 1, 0, 0, 0, 1 };
  static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
  	0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
  static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
  	0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
  
  static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
  	0x2C, 0x2E, 0x30, 0x32 };
  static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
  	0x62, 0x64, 0x66, 0x68 };
  
  static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
  	0x22, 0x23, 0x24, 0x25, 0x189 };
  static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
  	0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
  static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
  	1, 0, 1, 0, 1 };
  static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
  	10745, 3660, 9765, 10745, 3660 };
  static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
  	"VCC", "VTT", "VBAT", "VTR", "V_IN" };
  
  struct sch5627_data {
  	unsigned short addr;
  	struct device *hwmon_dev;

  	struct sch56xx_watchdog_data *watchdog;

  	u8 control;

  	u8 temp_max[SCH5627_NO_TEMPS];
  	u8 temp_crit[SCH5627_NO_TEMPS];
  	u16 fan_min[SCH5627_NO_FANS];
  
  	struct mutex update_lock;

  	unsigned long last_battery;	/* In jiffies */

  	char valid;			/* !=0 if following fields are valid */
  	unsigned long last_updated;	/* In jiffies */
  	u16 temp[SCH5627_NO_TEMPS];
  	u16 fan[SCH5627_NO_FANS];
  	u16 in[SCH5627_NO_IN];
  };

  static struct sch5627_data *sch5627_update_device(struct device *dev)
  {
  	struct sch5627_data *data = dev_get_drvdata(dev);
  	struct sch5627_data *ret = data;
  	int i, val;
  
  	mutex_lock(&data->update_lock);

  	/* Trigger a Vbat voltage measurement every 5 minutes */
  	if (time_after(jiffies, data->last_battery + 300 * HZ)) {

  		sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,

  					  data->control | 0x10);
  		data->last_battery = jiffies;
  	}

  	/* Cache the values for 1 second */
  	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  		for (i = 0; i < SCH5627_NO_TEMPS; i++) {

  			val = sch56xx_read_virtual_reg12(data->addr,

  				SCH5627_REG_TEMP_MSB[i],
  				SCH5627_REG_TEMP_LSN[i],
  				SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->temp[i] = val;
  		}
  
  		for (i = 0; i < SCH5627_NO_FANS; i++) {

  			val = sch56xx_read_virtual_reg16(data->addr,

  							 SCH5627_REG_FAN[i]);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->fan[i] = val;
  		}
  
  		for (i = 0; i < SCH5627_NO_IN; i++) {

  			val = sch56xx_read_virtual_reg12(data->addr,

  				SCH5627_REG_IN_MSB[i],
  				SCH5627_REG_IN_LSN[i],
  				SCH5627_REG_IN_HIGH_NIBBLE[i]);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->in[i] = val;
  		}
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}
  abort:
  	mutex_unlock(&data->update_lock);
  	return ret;
  }

  static int sch5627_read_limits(struct sch5627_data *data)

  {
  	int i, val;
  
  	for (i = 0; i < SCH5627_NO_TEMPS; i++) {
  		/*
  		 * Note what SMSC calls ABS, is what lm_sensors calls max
  		 * (aka high), and HIGH is what lm_sensors calls crit.
  		 */

  		val = sch56xx_read_virtual_reg(data->addr,
  					       SCH5627_REG_TEMP_ABS[i]);

  		if (val < 0)
  			return val;
  		data->temp_max[i] = val;

  		val = sch56xx_read_virtual_reg(data->addr,
  					       SCH5627_REG_TEMP_HIGH[i]);

  		if (val < 0)
  			return val;
  		data->temp_crit[i] = val;
  	}
  	for (i = 0; i < SCH5627_NO_FANS; i++) {

  		val = sch56xx_read_virtual_reg16(data->addr,
  						 SCH5627_REG_FAN_MIN[i]);

  		if (val < 0)
  			return val;
  		data->fan_min[i] = val;
  	}
  
  	return 0;
  }
  
  static int reg_to_temp(u16 reg)
  {
  	return (reg * 625) / 10 - 64000;
  }
  
  static int reg_to_temp_limit(u8 reg)
  {
  	return (reg - 64) * 1000;
  }
  
  static int reg_to_rpm(u16 reg)
  {
  	if (reg == 0)
  		return -EIO;
  	if (reg == 0xffff)
  		return 0;
  
  	return 5400540 / reg;
  }
  
  static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
  	char *buf)
  {
  	return snprintf(buf, PAGE_SIZE, "%s
  ", DEVNAME);
  }
  
  static ssize_t show_temp(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = sch5627_update_device(dev);
  	int val;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	val = reg_to_temp(data->temp[attr->index]);
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_temp_fault(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = sch5627_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ", data->temp[attr->index] == 0);
  }
  
  static ssize_t show_temp_max(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = dev_get_drvdata(dev);
  	int val;
  
  	val = reg_to_temp_limit(data->temp_max[attr->index]);
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_temp_crit(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = dev_get_drvdata(dev);
  	int val;
  
  	val = reg_to_temp_limit(data->temp_crit[attr->index]);
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_fan(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = sch5627_update_device(dev);
  	int val;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	val = reg_to_rpm(data->fan[attr->index]);
  	if (val < 0)
  		return val;
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_fan_fault(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = sch5627_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ",
  			data->fan[attr->index] == 0xffff);
  }
  
  static ssize_t show_fan_min(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = dev_get_drvdata(dev);
  	int val = reg_to_rpm(data->fan_min[attr->index]);
  	if (val < 0)
  		return val;
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_in(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct sch5627_data *data = sch5627_update_device(dev);
  	int val;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	val = DIV_ROUND_CLOSEST(
  		data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
  		10000);
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t show_in_label(struct device *dev, struct device_attribute
  	*devattr, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  
  	return snprintf(buf, PAGE_SIZE, "%s
  ",
  			SCH5627_IN_LABELS[attr->index]);
  }
  
  static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
  static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
  static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
  static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
  static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
  static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
  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 SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
  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(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
  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(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
  
  static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
  static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
  static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
  static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
  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(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
  static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
  static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
  static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
  
  static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
  static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
  static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
  static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
  static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
  static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
  static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
  
  static struct attribute *sch5627_attributes[] = {
  	&dev_attr_name.attr,
  
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp4_input.dev_attr.attr,
  	&sensor_dev_attr_temp5_input.dev_attr.attr,
  	&sensor_dev_attr_temp6_input.dev_attr.attr,
  	&sensor_dev_attr_temp7_input.dev_attr.attr,
  	&sensor_dev_attr_temp8_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_fault.dev_attr.attr,
  	&sensor_dev_attr_temp2_fault.dev_attr.attr,
  	&sensor_dev_attr_temp3_fault.dev_attr.attr,
  	&sensor_dev_attr_temp4_fault.dev_attr.attr,
  	&sensor_dev_attr_temp5_fault.dev_attr.attr,
  	&sensor_dev_attr_temp6_fault.dev_attr.attr,
  	&sensor_dev_attr_temp7_fault.dev_attr.attr,
  	&sensor_dev_attr_temp8_fault.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp4_max.dev_attr.attr,
  	&sensor_dev_attr_temp5_max.dev_attr.attr,
  	&sensor_dev_attr_temp6_max.dev_attr.attr,
  	&sensor_dev_attr_temp7_max.dev_attr.attr,
  	&sensor_dev_attr_temp8_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit.dev_attr.attr,
  	&sensor_dev_attr_temp4_crit.dev_attr.attr,
  	&sensor_dev_attr_temp5_crit.dev_attr.attr,
  	&sensor_dev_attr_temp6_crit.dev_attr.attr,
  	&sensor_dev_attr_temp7_crit.dev_attr.attr,
  	&sensor_dev_attr_temp8_crit.dev_attr.attr,
  
  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan3_input.dev_attr.attr,
  	&sensor_dev_attr_fan4_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_fault.dev_attr.attr,
  	&sensor_dev_attr_fan2_fault.dev_attr.attr,
  	&sensor_dev_attr_fan3_fault.dev_attr.attr,
  	&sensor_dev_attr_fan4_fault.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan3_min.dev_attr.attr,
  	&sensor_dev_attr_fan4_min.dev_attr.attr,
  
  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_in1_input.dev_attr.attr,
  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in3_input.dev_attr.attr,
  	&sensor_dev_attr_in4_input.dev_attr.attr,
  	&sensor_dev_attr_in0_label.dev_attr.attr,
  	&sensor_dev_attr_in1_label.dev_attr.attr,
  	&sensor_dev_attr_in2_label.dev_attr.attr,
  	&sensor_dev_attr_in3_label.dev_attr.attr,
  	/* No in4_label as in4 is a generic input pin */
  
  	NULL
  };
  
  static const struct attribute_group sch5627_group = {
  	.attrs = sch5627_attributes,
  };
  
  static int sch5627_remove(struct platform_device *pdev)
  {
  	struct sch5627_data *data = platform_get_drvdata(pdev);

  	if (data->watchdog)
  		sch56xx_watchdog_unregister(data->watchdog);

  	if (data->hwmon_dev)
  		hwmon_device_unregister(data->hwmon_dev);
  
  	sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);

  
  	return 0;
  }

  static int sch5627_probe(struct platform_device *pdev)

  {
  	struct sch5627_data *data;
  	int err, build_code, build_id, hwmon_rev, val;

  	data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
  			    GFP_KERNEL);

  	if (!data)
  		return -ENOMEM;
  
  	data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
  	mutex_init(&data->update_lock);
  	platform_set_drvdata(pdev, data);

  	val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);

  	if (val < 0) {
  		err = val;
  		goto error;
  	}
  	if (val != SCH5627_HWMON_ID) {
  		pr_err("invalid %s id: 0x%02X (expected 0x%02X)
  ", "hwmon",
  		       val, SCH5627_HWMON_ID);
  		err = -ENODEV;
  		goto error;
  	}

  	val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);

  	if (val < 0) {
  		err = val;
  		goto error;
  	}
  	if (val != SCH5627_COMPANY_ID) {
  		pr_err("invalid %s id: 0x%02X (expected 0x%02X)
  ", "company",
  		       val, SCH5627_COMPANY_ID);
  		err = -ENODEV;
  		goto error;
  	}

  	val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);

  	if (val < 0) {
  		err = val;
  		goto error;
  	}
  	if (val != SCH5627_PRIMARY_ID) {
  		pr_err("invalid %s id: 0x%02X (expected 0x%02X)
  ", "primary",
  		       val, SCH5627_PRIMARY_ID);
  		err = -ENODEV;
  		goto error;
  	}

  	build_code = sch56xx_read_virtual_reg(data->addr,
  					      SCH5627_REG_BUILD_CODE);

  	if (build_code < 0) {
  		err = build_code;
  		goto error;
  	}

  	build_id = sch56xx_read_virtual_reg16(data->addr,
  					      SCH5627_REG_BUILD_ID);

  	if (build_id < 0) {
  		err = build_id;
  		goto error;
  	}

  	hwmon_rev = sch56xx_read_virtual_reg(data->addr,
  					     SCH5627_REG_HWMON_REV);

  	if (hwmon_rev < 0) {
  		err = hwmon_rev;
  		goto error;
  	}

  	val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);

  	if (val < 0) {
  		err = val;
  		goto error;
  	}

  	data->control = val;
  	if (!(data->control & 0x01)) {

  		pr_err("hardware monitoring not enabled
  ");
  		err = -ENODEV;
  		goto error;
  	}

  	/* Trigger a Vbat voltage measurement, so that we get a valid reading
  	   the first time we read Vbat */

  	sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,

  				  data->control | 0x10);
  	data->last_battery = jiffies;

  
  	/*
  	 * Read limits, we do this only once as reading a register on
  	 * the sch5627 is quite expensive (and they don't change).
  	 */
  	err = sch5627_read_limits(data);
  	if (err)
  		goto error;

  	pr_info("found %s chip at %#hx
  ", DEVNAME, data->addr);

  	pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X
  ",
  		build_code, build_id, hwmon_rev);
  
  	/* Register sysfs interface files */
  	err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
  	if (err)
  		goto error;
  
  	data->hwmon_dev = hwmon_device_register(&pdev->dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);
  		data->hwmon_dev = NULL;
  		goto error;
  	}

  	/* Note failing to register the watchdog is not a fatal error */

  	data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,

  			(build_code << 24) | (build_id << 8) | hwmon_rev,
  			&data->update_lock, 1);

  	return 0;
  
  error:
  	sch5627_remove(pdev);
  	return err;
  }

  static struct platform_driver sch5627_driver = {
  	.driver = {

  		.name	= DRVNAME,
  	},
  	.probe		= sch5627_probe,
  	.remove		= sch5627_remove,
  };

  module_platform_driver(sch5627_driver);

  
  MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");

  MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");

  MODULE_LICENSE("GPL");