// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   * vt8231.c - Part of lm_sensors, Linux kernel modules
   *	      for hardware monitoring
   *
   * Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
   * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   *		      Aaron M. Marsh <amarsh@sdf.lonestar.org>

   */

  /*
   * Supports VIA VT8231 South Bridge embedded sensors
   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/pci.h>
  #include <linux/jiffies.h>

  #include <linux/platform_device.h>

  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/hwmon-vid.h>
  #include <linux/err.h>

  #include <linux/mutex.h>

  #include <linux/acpi.h>

  #include <linux/io.h>

  
  static int force_addr;
  module_param(force_addr, int, 0);
  MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");

  static struct platform_device *pdev;

  
  #define VT8231_EXTENT 0x80
  #define VT8231_BASE_REG 0x70
  #define VT8231_ENABLE_REG 0x74

  /*
   * The VT8231 registers
   *
   * The reset value for the input channel configuration is used (Reg 0x4A=0x07)
   * which sets the selected inputs marked with '*' below if multiple options are
   * possible:
   *
   *		    Voltage Mode	  Temperature Mode
   *	Sensor	      Linux Id	      Linux Id	      VIA Id
   *	--------      --------	      --------	      ------
   *	CPU Diode	N/A		temp1		0
   *	UIC1		in0		temp2 *		1
   *	UIC2		in1 *		temp3		2
   *	UIC3		in2 *		temp4		3
   *	UIC4		in3 *		temp5		4
   *	UIC5		in4 *		temp6		5
   *	3.3V		in5		N/A
   *
   * Note that the BIOS may set the configuration register to a different value
   * to match the motherboard configuration.
   */

  
  /* fans numbered 0-1 */
  #define VT8231_REG_FAN_MIN(nr)	(0x3b + (nr))
  #define VT8231_REG_FAN(nr)	(0x29 + (nr))
  
  /* Voltage inputs numbered 0-5 */
  
  static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };

  /*
   * Temperatures are numbered 1-6 according to the Linux kernel specification.
   *
   * In the VIA datasheet, however, the temperatures are numbered from zero.
   * Since it is important that this driver can easily be compared to the VIA
   * datasheet, we will use the VIA numbering within this driver and map the
   * kernel sysfs device name to the VIA number in the sysfs callback.
   */

  
  #define VT8231_REG_TEMP_LOW01	0x49
  #define VT8231_REG_TEMP_LOW25	0x4d
  
  static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
  static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
  
  #define TEMP_FROM_REG(reg)		(((253 * 4 - (reg)) * 550 + 105) / 210)
  #define TEMP_MAXMIN_FROM_REG(reg)	(((253 - (reg)) * 2200 + 105) / 210)
  #define TEMP_MAXMIN_TO_REG(val)		(253 - ((val) * 210 + 1100) / 2200)
  
  #define VT8231_REG_CONFIG 0x40
  #define VT8231_REG_ALARM1 0x41
  #define VT8231_REG_ALARM2 0x42
  #define VT8231_REG_FANDIV 0x47
  #define VT8231_REG_UCH_CONFIG 0x4a
  #define VT8231_REG_TEMP1_CONFIG 0x4b
  #define VT8231_REG_TEMP2_CONFIG 0x4c

  /*
   * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
   * numbering
   */

  #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
  			      ((ch_config) >> ((i)+1)) & 0x01)
  /* voltages 0-5 */
  #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
  			      !(((ch_config) >> ((i)+2)) & 0x01))
  
  #define DIV_FROM_REG(val) (1 << (val))

  /*
   * NB  The values returned here are NOT temperatures.  The calibration curves
   *     for the thermistor curves are board-specific and must go in the
   *     sensors.conf file.  Temperature sensors are actually ten bits, but the
   *     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
   *     register.  The temperature value returned should have a magnitude of 3,
   *     so we use the VIA scaling as the "true" scaling and use the remaining 2
   *     LSBs as fractional precision.
   *
   *     All the on-chip hardware temperature comparisons for the alarms are only
   *     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
   *     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
   *     ignored.
   */
  
  /*
   ****** FAN RPM CONVERSIONS ********
   * This chip saturates back at 0, not at 255 like many the other chips.
   * So, 0 means 0 RPM
   */

  static inline u8 FAN_TO_REG(long rpm, int div)
  {

  	if (rpm <= 0 || rpm > 1310720)

  		return 0;

  	return clamp_val(1310720 / (rpm * div), 1, 255);

  }
  
  #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
  
  struct vt8231_data {

  	unsigned short addr;
  	const char *name;

  	struct mutex update_lock;

  	struct device *hwmon_dev;

  	char valid;		/* !=0 if following fields are valid */
  	unsigned long last_updated;	/* In jiffies */
  
  	u8 in[6];		/* Register value */
  	u8 in_max[6];		/* Register value */
  	u8 in_min[6];		/* Register value */
  	u16 temp[6];		/* Register value 10 bit, right aligned */
  	u8 temp_max[6];		/* Register value */
  	u8 temp_min[6];		/* Register value */
  	u8 fan[2];		/* Register value */
  	u8 fan_min[2];		/* Register value */
  	u8 fan_div[2];		/* Register encoding, shifted right */
  	u16 alarms;		/* Register encoding */
  	u8 uch_config;
  };
  
  static struct pci_dev *s_bridge;

  static int vt8231_probe(struct platform_device *pdev);

  static int vt8231_remove(struct platform_device *pdev);

  static struct vt8231_data *vt8231_update_device(struct device *dev);

  static void vt8231_init_device(struct vt8231_data *data);

  static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)

  {

  	return inb_p(data->addr + reg);

  }

  static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,

  					u8 value)
  {

  	outb_p(value, data->addr + reg);

  }
  
  /* following are the sysfs callback functions */

  static ssize_t in_show(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 vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ", ((data->in[nr] - 3) * 10000) / 958);
  }

  static ssize_t in_min_show(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 vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ", ((data->in_min[nr] - 3) * 10000) / 958);
  }

  static ssize_t in_max_show(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 vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ", (((data->in_max[nr] - 3) * 10000) / 958));
  }

  static ssize_t in_min_store(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 vt8231_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->in_min[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);

  	vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t in_max_store(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 vt8231_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->in_max[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);

  	vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }
  
  /* Special case for input 5 as this has 3.3V scaling built into the chip */

  static ssize_t in5_input_show(struct device *dev,
  			      struct device_attribute *attr, char *buf)

  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ",
  		(((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
  }

  static ssize_t in5_min_show(struct device *dev, struct device_attribute *attr,

  		char *buf)
  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ",
  		(((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
  }

  static ssize_t in5_max_show(struct device *dev, struct device_attribute *attr,

  		char *buf)
  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  
  	return sprintf(buf, "%d
  ",
  		(((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
  }

  static ssize_t in5_min_store(struct device *dev,
  			     struct device_attribute *attr, const char *buf,
  			     size_t count)

  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->in_min[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
  				    0, 255);

  	vt8231_write_value(data, regvoltmin[5], data->in_min[5]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t in5_max_store(struct device *dev,
  			     struct device_attribute *attr, const char *buf,
  			     size_t count)

  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->in_max[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
  				    0, 255);

  	vt8231_write_value(data, regvoltmax[5], data->in_max[5]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
  static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
  static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
  static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
  static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
  static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
  static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
  static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
  static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
  static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
  static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
  static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
  static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
  static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
  static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);

  static DEVICE_ATTR_RO(in5_input);
  static DEVICE_ATTR_RW(in5_min);
  static DEVICE_ATTR_RW(in5_max);

  
  /* Temperatures */

  static ssize_t temp1_input_show(struct device *dev,
  				struct device_attribute *attr, char *buf)

  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", data->temp[0] * 250);
  }

  static ssize_t temp1_max_show(struct device *dev, struct device_attribute *attr,

  		char *buf)
  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", data->temp_max[0] * 1000);
  }

  static ssize_t temp1_max_hyst_show(struct device *dev,
  				   struct device_attribute *attr, char *buf)

  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", data->temp_min[0] * 1000);
  }

  static ssize_t temp1_max_store(struct device *dev,
  			       struct device_attribute *attr, const char *buf,
  			       size_t count)

  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->temp_max[0] = clamp_val((val + 500) / 1000, 0, 255);

  	vt8231_write_value(data, regtempmax[0], data->temp_max[0]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t temp1_max_hyst_store(struct device *dev,
  				    struct device_attribute *attr,
  				    const char *buf, size_t count)

  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->temp_min[0] = clamp_val((val + 500) / 1000, 0, 255);

  	vt8231_write_value(data, regtempmin[0], data->temp_min[0]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t temp_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp[nr]));
  }

  static ssize_t temp_max_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
  }

  static ssize_t temp_min_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
  }

  static ssize_t temp_max_store(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 vt8231_data *data = dev_get_drvdata(dev);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->temp_max[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);

  	vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t temp_min_store(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 vt8231_data *data = dev_get_drvdata(dev);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->temp_min[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);

  	vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  /*
   * Note that these map the Linux temperature sensor numbering (1-6) to the VIA
   * temperature sensor numbering (0-5)
   */

  static DEVICE_ATTR_RO(temp1_input);
  static DEVICE_ATTR_RW(temp1_max);
  static DEVICE_ATTR_RW(temp1_max_hyst);

  static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, temp_min, 1);
  static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, temp_min, 2);
  static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
  static SENSOR_DEVICE_ATTR_RW(temp4_max, temp_max, 3);
  static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, temp_min, 3);
  static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
  static SENSOR_DEVICE_ATTR_RW(temp5_max, temp_max, 4);
  static SENSOR_DEVICE_ATTR_RW(temp5_max_hyst, temp_min, 4);
  static SENSOR_DEVICE_ATTR_RO(temp6_input, temp, 5);
  static SENSOR_DEVICE_ATTR_RW(temp6_max, temp_max, 5);
  static SENSOR_DEVICE_ATTR_RW(temp6_max_hyst, temp_min, 5);

  /* Fans */

  static ssize_t fan_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan[nr],
  				DIV_FROM_REG(data->fan_div[nr])));
  }

  static ssize_t fan_min_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_min[nr],
  			DIV_FROM_REG(data->fan_div[nr])));
  }

  static ssize_t fan_div_show(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 vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", DIV_FROM_REG(data->fan_div[nr]));
  }

  static ssize_t fan_min_store(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 vt8231_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));

  	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t fan_div_store(struct device *dev,
  			     struct device_attribute *attr, const char *buf,
  			     size_t count)

  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

  	unsigned long val;

  	int nr = sensor_attr->index;

  	int old = vt8231_read_value(data, VT8231_REG_FANDIV);

  	long min = FAN_FROM_REG(data->fan_min[nr],
  				 DIV_FROM_REG(data->fan_div[nr]));

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

  	mutex_lock(&data->update_lock);

  	switch (val) {

  	case 1:
  		data->fan_div[nr] = 0;
  		break;
  	case 2:
  		data->fan_div[nr] = 1;
  		break;
  	case 4:
  		data->fan_div[nr] = 2;
  		break;
  	case 8:
  		data->fan_div[nr] = 3;
  		break;

  	default:

  		dev_err(dev,
  			"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!
  ",
  			val);

  		mutex_unlock(&data->update_lock);

  		return -EINVAL;
  	}
  
  	/* Correct the fan minimum speed */
  	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));

  	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);

  
  	old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);

  	vt8231_write_value(data, VT8231_REG_FANDIV, old);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
  static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
  static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
  static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
  static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
  static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);

  
  /* Alarms */

  static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,

  			   char *buf)
  {
  	struct vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%d
  ", data->alarms);
  }

  static DEVICE_ATTR_RO(alarms);

  static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,

  			  char *buf)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct vt8231_data *data = vt8231_update_device(dev);
  	return sprintf(buf, "%u
  ", (data->alarms >> bitnr) & 1);
  }

  static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
  static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 11);
  static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0);
  static SENSOR_DEVICE_ATTR_RO(temp4_alarm, alarm, 1);
  static SENSOR_DEVICE_ATTR_RO(temp5_alarm, alarm, 3);
  static SENSOR_DEVICE_ATTR_RO(temp6_alarm, alarm, 8);
  static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 11);
  static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0);
  static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 1);
  static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
  static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
  static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 2);
  static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
  static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);

  static ssize_t name_show(struct device *dev, struct device_attribute

  			 *devattr, char *buf)
  {
  	struct vt8231_data *data = dev_get_drvdata(dev);
  	return sprintf(buf, "%s
  ", data->name);
  }

  static DEVICE_ATTR_RO(name);

  static struct attribute *vt8231_attributes_temps[6][5] = {

  	{
  		&dev_attr_temp1_input.attr,
  		&dev_attr_temp1_max_hyst.attr,
  		&dev_attr_temp1_max.attr,

  		&sensor_dev_attr_temp1_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_temp2_input.dev_attr.attr,
  		&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
  		&sensor_dev_attr_temp2_max.dev_attr.attr,

  		&sensor_dev_attr_temp2_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_temp3_input.dev_attr.attr,
  		&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
  		&sensor_dev_attr_temp3_max.dev_attr.attr,

  		&sensor_dev_attr_temp3_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_temp4_input.dev_attr.attr,
  		&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
  		&sensor_dev_attr_temp4_max.dev_attr.attr,

  		&sensor_dev_attr_temp4_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_temp5_input.dev_attr.attr,
  		&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
  		&sensor_dev_attr_temp5_max.dev_attr.attr,

  		&sensor_dev_attr_temp5_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_temp6_input.dev_attr.attr,
  		&sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
  		&sensor_dev_attr_temp6_max.dev_attr.attr,

  		&sensor_dev_attr_temp6_alarm.dev_attr.attr,

  		NULL
  	}
  };
  
  static const struct attribute_group vt8231_group_temps[6] = {
  	{ .attrs = vt8231_attributes_temps[0] },
  	{ .attrs = vt8231_attributes_temps[1] },
  	{ .attrs = vt8231_attributes_temps[2] },
  	{ .attrs = vt8231_attributes_temps[3] },
  	{ .attrs = vt8231_attributes_temps[4] },
  	{ .attrs = vt8231_attributes_temps[5] },
  };

  static struct attribute *vt8231_attributes_volts[6][5] = {

  	{
  		&sensor_dev_attr_in0_input.dev_attr.attr,
  		&sensor_dev_attr_in0_min.dev_attr.attr,
  		&sensor_dev_attr_in0_max.dev_attr.attr,

  		&sensor_dev_attr_in0_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_in1_input.dev_attr.attr,
  		&sensor_dev_attr_in1_min.dev_attr.attr,
  		&sensor_dev_attr_in1_max.dev_attr.attr,

  		&sensor_dev_attr_in1_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_in2_input.dev_attr.attr,
  		&sensor_dev_attr_in2_min.dev_attr.attr,
  		&sensor_dev_attr_in2_max.dev_attr.attr,

  		&sensor_dev_attr_in2_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_in3_input.dev_attr.attr,
  		&sensor_dev_attr_in3_min.dev_attr.attr,
  		&sensor_dev_attr_in3_max.dev_attr.attr,

  		&sensor_dev_attr_in3_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&sensor_dev_attr_in4_input.dev_attr.attr,
  		&sensor_dev_attr_in4_min.dev_attr.attr,
  		&sensor_dev_attr_in4_max.dev_attr.attr,

  		&sensor_dev_attr_in4_alarm.dev_attr.attr,

  		NULL
  	}, {
  		&dev_attr_in5_input.attr,
  		&dev_attr_in5_min.attr,
  		&dev_attr_in5_max.attr,

  		&sensor_dev_attr_in5_alarm.dev_attr.attr,

  		NULL
  	}
  };
  
  static const struct attribute_group vt8231_group_volts[6] = {
  	{ .attrs = vt8231_attributes_volts[0] },
  	{ .attrs = vt8231_attributes_volts[1] },
  	{ .attrs = vt8231_attributes_volts[2] },
  	{ .attrs = vt8231_attributes_volts[3] },
  	{ .attrs = vt8231_attributes_volts[4] },
  	{ .attrs = vt8231_attributes_volts[5] },
  };
  
  static struct attribute *vt8231_attributes[] = {
  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan1_div.dev_attr.attr,
  	&sensor_dev_attr_fan2_div.dev_attr.attr,

  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,

  	&dev_attr_alarms.attr,

  	&dev_attr_name.attr,

  	NULL
  };
  
  static const struct attribute_group vt8231_group = {
  	.attrs = vt8231_attributes,
  };

  static struct platform_driver vt8231_driver = {

  	.driver = {

  		.name	= "vt8231",
  	},

  	.probe	= vt8231_probe,

  	.remove	= vt8231_remove,

  };

  static const struct pci_device_id vt8231_pci_ids[] = {

  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
  	{ 0, }
  };
  
  MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);

  static int vt8231_pci_probe(struct pci_dev *dev,

  				      const struct pci_device_id *id);

  
  static struct pci_driver vt8231_pci_driver = {
  	.name		= "vt8231",
  	.id_table	= vt8231_pci_ids,
  	.probe		= vt8231_pci_probe,
  };

  static int vt8231_probe(struct platform_device *pdev)

  {

  	struct resource *res;

  	struct vt8231_data *data;
  	int err = 0, i;

  
  	/* Reserve the ISA region */

  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

  	if (!devm_request_region(&pdev->dev, res->start, VT8231_EXTENT,
  				 vt8231_driver.driver.name)) {

  		dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!
  ",
  			(unsigned long)res->start, (unsigned long)res->end);

  		return -ENODEV;
  	}

  	data = devm_kzalloc(&pdev->dev, sizeof(struct vt8231_data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;

  	platform_set_drvdata(pdev, data);
  	data->addr = res->start;
  	data->name = "vt8231";

  	mutex_init(&data->update_lock);

  	vt8231_init_device(data);

  
  	/* Register sysfs hooks */

  	err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
  	if (err)

  		return err;

  
  	/* Must update device information to find out the config field */

  	data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);

  	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {

  		if (ISTEMP(i, data->uch_config)) {

  			err = sysfs_create_group(&pdev->dev.kobj,
  						 &vt8231_group_temps[i]);
  			if (err)

  				goto exit_remove_files;

  		}
  	}

  	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {

  		if (ISVOLT(i, data->uch_config)) {

  			err = sysfs_create_group(&pdev->dev.kobj,
  						 &vt8231_group_volts[i]);
  			if (err)

  				goto exit_remove_files;

  		}
  	}

  	data->hwmon_dev = hwmon_device_register(&pdev->dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);

  		goto exit_remove_files;
  	}

  	return 0;

  exit_remove_files:
  	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)

  		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);

  
  	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)

  		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
  
  	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);

  	return err;
  }

  static int vt8231_remove(struct platform_device *pdev)

  {

  	struct vt8231_data *data = platform_get_drvdata(pdev);
  	int i;

  	hwmon_device_unregister(data->hwmon_dev);

  	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)

  		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);

  
  	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)

  		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);

  	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);

  	return 0;
  }

  static void vt8231_init_device(struct vt8231_data *data)

  {

  	vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
  	vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);

  }
  
  static struct vt8231_data *vt8231_update_device(struct device *dev)
  {

  	struct vt8231_data *data = dev_get_drvdata(dev);

  	int i;
  	u16 low;

  	mutex_lock(&data->update_lock);

  
  	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
  	    || !data->valid) {
  		for (i = 0; i < 6; i++) {
  			if (ISVOLT(i, data->uch_config)) {

  				data->in[i] = vt8231_read_value(data,

  						regvolt[i]);

  				data->in_min[i] = vt8231_read_value(data,

  						regvoltmin[i]);

  				data->in_max[i] = vt8231_read_value(data,

  						regvoltmax[i]);
  			}
  		}
  		for (i = 0; i < 2; i++) {

  			data->fan[i] = vt8231_read_value(data,

  						VT8231_REG_FAN(i));

  			data->fan_min[i] = vt8231_read_value(data,

  						VT8231_REG_FAN_MIN(i));
  		}

  		low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);

  		low = (low >> 6) | ((low & 0x30) >> 2)

  		    | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);

  		for (i = 0; i < 6; i++) {
  			if (ISTEMP(i, data->uch_config)) {

  				data->temp[i] = (vt8231_read_value(data,

  						       regtemp[i]) << 2)
  						| ((low >> (2 * i)) & 0x03);

  				data->temp_max[i] = vt8231_read_value(data,

  						      regtempmax[i]);

  				data->temp_min[i] = vt8231_read_value(data,

  						      regtempmin[i]);
  			}
  		}

  		i = vt8231_read_value(data, VT8231_REG_FANDIV);

  		data->fan_div[0] = (i >> 4) & 0x03;
  		data->fan_div[1] = i >> 6;

  		data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
  			(vt8231_read_value(data, VT8231_REG_ALARM2) << 8);

  
  		/* Set alarm flags correctly */

  		if (!data->fan[0] && data->fan_min[0])

  			data->alarms |= 0x40;

  		else if (data->fan[0] && !data->fan_min[0])

  			data->alarms &= ~0x40;

  		if (!data->fan[1] && data->fan_min[1])

  			data->alarms |= 0x80;

  		else if (data->fan[1] && !data->fan_min[1])

  			data->alarms &= ~0x80;

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

  	mutex_unlock(&data->update_lock);

  
  	return data;
  }

  static int vt8231_device_add(unsigned short address)

  {
  	struct resource res = {
  		.start	= address,
  		.end	= address + VT8231_EXTENT - 1,
  		.name	= "vt8231",
  		.flags	= IORESOURCE_IO,
  	};
  	int err;

  	err = acpi_check_resource_conflict(&res);
  	if (err)
  		goto exit;

  	pdev = platform_device_alloc("vt8231", address);
  	if (!pdev) {
  		err = -ENOMEM;

  		pr_err("Device allocation failed
  ");

  		goto exit;
  	}
  
  	err = platform_device_add_resources(pdev, &res, 1);
  	if (err) {

  		pr_err("Device resource addition failed (%d)
  ", err);

  		goto exit_device_put;
  	}
  
  	err = platform_device_add(pdev);
  	if (err) {

  		pr_err("Device addition failed (%d)
  ", err);

  		goto exit_device_put;
  	}
  
  	return 0;
  
  exit_device_put:
  	platform_device_put(pdev);
  exit:
  	return err;
  }

  static int vt8231_pci_probe(struct pci_dev *dev,

  				const struct pci_device_id *id)
  {

  	u16 address, val;
  	if (force_addr) {
  		address = force_addr & 0xff00;
  		dev_warn(&dev->dev, "Forcing ISA address 0x%x
  ",
  			 address);
  
  		if (PCIBIOS_SUCCESSFUL !=
  		    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
  			return -ENODEV;
  	}

  	pci_read_config_word(dev, VT8231_BASE_REG, &val);
  	if (val == (u16)~0)

  		return -ENODEV;

  	address = val & ~(VT8231_EXTENT - 1);
  	if (address == 0) {

  		dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr
  ");

  		return -ENODEV;
  	}

  	pci_read_config_word(dev, VT8231_ENABLE_REG, &val);
  	if (val == (u16)~0)

  		return -ENODEV;

  	if (!(val & 0x0001)) {
  		dev_warn(&dev->dev, "enabling sensors
  ");
  		if (PCIBIOS_SUCCESSFUL !=
  			pci_write_config_word(dev, VT8231_ENABLE_REG,
  							val | 0x0001))
  			return -ENODEV;

  	}

  	if (platform_driver_register(&vt8231_driver))
  		goto exit;
  
  	/* Sets global pdev as a side effect */
  	if (vt8231_device_add(address))
  		goto exit_unregister;

  	/*
  	 * Always return failure here.  This is to allow other drivers to bind

  	 * to this pci device.  We don't really want to have control over the
  	 * pci device, we only wanted to read as few register values from it.
  	 */

  	/*
  	 * We do, however, mark ourselves as using the PCI device to stop it
  	 * getting unloaded.
  	 */

  	s_bridge = pci_dev_get(dev);
  	return -ENODEV;
  
  exit_unregister:
  	platform_driver_unregister(&vt8231_driver);
  exit:

  	return -ENODEV;
  }
  
  static int __init sm_vt8231_init(void)
  {

  	return pci_register_driver(&vt8231_pci_driver);

  }
  
  static void __exit sm_vt8231_exit(void)
  {
  	pci_unregister_driver(&vt8231_pci_driver);
  	if (s_bridge != NULL) {

  		platform_device_unregister(pdev);
  		platform_driver_unregister(&vt8231_driver);

  		pci_dev_put(s_bridge);
  		s_bridge = NULL;
  	}
  }

  MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");

  MODULE_DESCRIPTION("VT8231 sensors");
  MODULE_LICENSE("GPL");
  
  module_init(sm_vt8231_init);
  module_exit(sm_vt8231_exit);