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

  /*
   * lm87.c
   *
   * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
   *                          Philip Edelbrock <phil@netroedge.com>
   *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
   *                          Dan Eaton <dan.eaton@rocketlogix.com>

   * Copyright (C) 2004-2008  Jean Delvare <jdelvare@suse.de>

   *
   * Original port to Linux 2.6 by Jeff Oliver.
   *
   * The LM87 is a sensor chip made by National Semiconductor. It monitors up
   * to 8 voltages (including its own power source), up to three temperatures
   * (its own plus up to two external ones) and up to two fans. The default
   * configuration is 6 voltages, two temperatures and two fans (see below).
   * Voltages are scaled internally with ratios such that the nominal value of
   * each voltage correspond to a register value of 192 (which means a
   * resolution of about 0.5% of the nominal value). Temperature values are
   * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
   * datasheet can be obtained from National's website at:
   *   http://www.national.com/pf/LM/LM87.html
   *
   * Some functions share pins, so not all functions are available at the same

   * time. Which are depends on the hardware setup. This driver normally
   * assumes that firmware configured the chip correctly. Where this is not
   * the case, platform code must set the I2C client's platform_data to point
   * to a u8 value to be written to the channel register.

   * For reference, here is the list of exclusive functions:
   *  - in0+in5 (default) or temp3
   *  - fan1 (default) or in6
   *  - fan2 (default) or in7
   *  - VID lines (default) or IRQ lines (not handled by this driver)
   *
   * The LM87 additionally features an analog output, supposedly usable to
   * control the speed of a fan. All new chips use pulse width modulation
   * instead. The LM87 is the only hardware monitoring chipset I know of
   * which uses amplitude modulation. Be careful when using this feature.
   *

   * This driver also supports the ADM1024, a sensor chip made by Analog
   * Devices. That chip is fully compatible with the LM87. Complete
   * datasheet can be obtained from Analog's website at:

   *   https://www.analog.com/en/prod/0,2877,ADM1024,00.html

   */

  #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/hwmon-vid.h>

  #include <linux/err.h>

  #include <linux/mutex.h>

  #include <linux/regulator/consumer.h>

  
  /*
   * Addresses to scan
   * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
   */

  static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

  /*
   * The LM87 registers
   */
  
  /* nr in 0..5 */
  #define LM87_REG_IN(nr)			(0x20 + (nr))
  #define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
  #define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
  /* nr in 0..1 */
  #define LM87_REG_AIN(nr)		(0x28 + (nr))
  #define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
  #define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))
  
  static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
  static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
  static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  
  #define LM87_REG_TEMP_HW_INT_LOCK	0x13
  #define LM87_REG_TEMP_HW_EXT_LOCK	0x14
  #define LM87_REG_TEMP_HW_INT		0x17
  #define LM87_REG_TEMP_HW_EXT		0x18
  
  /* nr in 0..1 */
  #define LM87_REG_FAN(nr)		(0x28 + (nr))
  #define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
  #define LM87_REG_AOUT			0x19
  
  #define LM87_REG_CONFIG			0x40
  #define LM87_REG_CHANNEL_MODE		0x16
  #define LM87_REG_VID_FAN_DIV		0x47
  #define LM87_REG_VID4			0x49
  
  #define LM87_REG_ALARMS1		0x41
  #define LM87_REG_ALARMS2		0x42
  
  #define LM87_REG_COMPANY_ID		0x3E
  #define LM87_REG_REVISION		0x3F
  
  /*
   * Conversions and various macros
   * The LM87 uses signed 8-bit values for temperatures.
   */

  #define IN_FROM_REG(reg, scale)	(((reg) * (scale) + 96) / 192)
  #define IN_TO_REG(val, scale)	((val) <= 0 ? 0 : \

  				 (val) >= (scale) * 255 / 192 ? 255 : \

  				 ((val) * 192 + (scale) / 2) / (scale))

  
  #define TEMP_FROM_REG(reg)	((reg) * 1000)
  #define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
  				 (val) >= 126500 ? 127 : \

  				 (((val) < 0 ? (val) - 500 : \
  				   (val) + 500) / 1000))

  #define FAN_FROM_REG(reg, div)	((reg) == 255 || (reg) == 0 ? 0 : \
  				 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
  #define FAN_TO_REG(val, div)	((val) * (div) * 255 <= 1350000 ? 255 : \
  				 (1350000 + (val)*(div) / 2) / ((val) * (div)))

  
  #define FAN_DIV_FROM_REG(reg)	(1 << (reg))
  
  /* analog out is 9.80mV/LSB */
  #define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
  #define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
  				 (val) >= 2500 ? 255 : \
  				 ((val) * 10 + 49) / 98)
  
  /* nr in 0..1 */
  #define CHAN_NO_FAN(nr)		(1 << (nr))
  #define CHAN_TEMP3		(1 << 2)
  #define CHAN_VCC_5V		(1 << 3)

  #define CHAN_NO_VID		(1 << 7)

  
  /*

   * Client data (each client gets its own)
   */
  
  struct lm87_data {

  	struct mutex update_lock;

  	char valid; /* zero until following fields are valid */
  	unsigned long last_updated; /* In jiffies */
  
  	u8 channel;		/* register value */

  	u8 config;		/* original register value */

  
  	u8 in[8];		/* register value */
  	u8 in_max[8];		/* register value */
  	u8 in_min[8];		/* register value */
  	u16 in_scale[8];
  
  	s8 temp[3];		/* register value */
  	s8 temp_high[3];	/* register value */
  	s8 temp_low[3];		/* register value */
  	s8 temp_crit_int;	/* min of two register values */
  	s8 temp_crit_ext;	/* min of two register values */
  
  	u8 fan[2];		/* register value */
  	u8 fan_min[2];		/* register value */
  	u8 fan_div[2];		/* register value, shifted right */
  	u8 aout;		/* register value */
  
  	u16 alarms;		/* register values, combined */
  	u8 vid;			/* register values, combined */
  	u8 vrm;

  
  	const struct attribute_group *attr_groups[6];

  };

  static inline int lm87_read_value(struct i2c_client *client, u8 reg)
  {
  	return i2c_smbus_read_byte_data(client, reg);
  }
  
  static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
  {
  	return i2c_smbus_write_byte_data(client, reg, value);
  }

  static struct lm87_data *lm87_update_device(struct device *dev)
  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);
  
  	mutex_lock(&data->update_lock);
  
  	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  		int i, j;
  
  		dev_dbg(&client->dev, "Updating data.
  ");
  
  		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
  		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
  		for (; i < j; i++) {
  			data->in[i] = lm87_read_value(client,
  				      LM87_REG_IN(i));
  			data->in_min[i] = lm87_read_value(client,
  					  LM87_REG_IN_MIN(i));
  			data->in_max[i] = lm87_read_value(client,
  					  LM87_REG_IN_MAX(i));
  		}
  
  		for (i = 0; i < 2; i++) {
  			if (data->channel & CHAN_NO_FAN(i)) {
  				data->in[6+i] = lm87_read_value(client,
  						LM87_REG_AIN(i));
  				data->in_max[6+i] = lm87_read_value(client,
  						    LM87_REG_AIN_MAX(i));
  				data->in_min[6+i] = lm87_read_value(client,
  						    LM87_REG_AIN_MIN(i));
  
  			} else {
  				data->fan[i] = lm87_read_value(client,
  					       LM87_REG_FAN(i));
  				data->fan_min[i] = lm87_read_value(client,
  						   LM87_REG_FAN_MIN(i));
  			}
  		}
  
  		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
  		for (i = 0 ; i < j; i++) {
  			data->temp[i] = lm87_read_value(client,
  					LM87_REG_TEMP[i]);
  			data->temp_high[i] = lm87_read_value(client,
  					     LM87_REG_TEMP_HIGH[i]);
  			data->temp_low[i] = lm87_read_value(client,
  					    LM87_REG_TEMP_LOW[i]);
  		}
  
  		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
  		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
  		data->temp_crit_int = min(i, j);
  
  		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
  		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
  		data->temp_crit_ext = min(i, j);
  
  		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
  		data->fan_div[0] = (i >> 4) & 0x03;
  		data->fan_div[1] = (i >> 6) & 0x03;
  		data->vid = (i & 0x0F)
  			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
  			     << 4;
  
  		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
  			     | (lm87_read_value(client, LM87_REG_ALARMS2)
  				<< 8);
  		data->aout = lm87_read_value(client, LM87_REG_AOUT);
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}
  
  	mutex_unlock(&data->update_lock);
  
  	return data;
  }
  
  /*
   * Sysfs stuff
   */

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%u
  ", IN_FROM_REG(data->in[nr],
  		       data->in_scale[nr]));
  }

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%u
  ", IN_FROM_REG(data->in_min[nr],
  		       data->in_scale[nr]));
  }

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%u
  ", IN_FROM_REG(data->in_max[nr],
  		       data->in_scale[nr]));
  }

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

  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

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

  	mutex_lock(&data->update_lock);

  	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);

  	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
  			 LM87_REG_AIN_MIN(nr - 6), 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 i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

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

  	mutex_lock(&data->update_lock);

  	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);

  	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
  			 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

  static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 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_input, 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_input, 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_input, 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_input, 4);
  static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
  static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
  static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);
  static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
  static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
  static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);
  static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
  static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
  static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
  static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
  static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
  
  static ssize_t temp_input_show(struct device *dev,

  			       struct device_attribute *attr, char *buf)
  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp[nr]));
  }

  static ssize_t temp_low_show(struct device *dev,

  			     struct device_attribute *attr, char *buf)
  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ",
  		       TEMP_FROM_REG(data->temp_low[nr]));
  }

  static ssize_t temp_high_show(struct device *dev,

  			      struct device_attribute *attr, char *buf)
  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ",
  		       TEMP_FROM_REG(data->temp_high[nr]));
  }

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

  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

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

  	mutex_lock(&data->update_lock);

  	data->temp_low[nr] = TEMP_TO_REG(val);
  	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

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

  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

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

  	mutex_lock(&data->update_lock);

  	data->temp_high[nr] = TEMP_TO_REG(val);
  	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

  static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
  static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
  static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
  static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
  static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);

  static ssize_t temp1_crit_show(struct device *dev,
  			       struct device_attribute *attr, char *buf)

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_crit_int));
  }

  static ssize_t temp2_crit_show(struct device *dev,
  			       struct device_attribute *attr, char *buf)

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_crit_ext));
  }

  static DEVICE_ATTR_RO(temp1_crit);
  static DEVICE_ATTR_RO(temp2_crit);

  static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);

  static ssize_t fan_input_show(struct device *dev,

  			      struct device_attribute *attr, char *buf)
  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan[nr],
  		       FAN_DIV_FROM_REG(data->fan_div[nr])));
  }

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_min[nr],
  		       FAN_DIV_FROM_REG(data->fan_div[nr])));
  }

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int nr = to_sensor_dev_attr(attr)->index;
  
  	return sprintf(buf, "%d
  ",
  		       FAN_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 i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

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

  	mutex_lock(&data->update_lock);

  	data->fan_min[nr] = FAN_TO_REG(val,
  			    FAN_DIV_FROM_REG(data->fan_div[nr]));
  	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

  /*
   * Note: we save and restore the fan minimum here, because its value is
   * determined in part by the fan clock divider.  This follows the principle
   * of least surprise; the user doesn't expect the fan minimum to change just
   * because the divider changed.
   */

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

  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

  	int nr = to_sensor_dev_attr(attr)->index;

  	long val;
  	int err;

  	unsigned long min;
  	u8 reg;

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

  	mutex_lock(&data->update_lock);

  	min = FAN_FROM_REG(data->fan_min[nr],
  			   FAN_DIV_FROM_REG(data->fan_div[nr]));
  
  	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:

  		mutex_unlock(&data->update_lock);

  		return -EINVAL;
  	}
  
  	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
  	switch (nr) {
  	case 0:
  	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
  	    break;
  	case 1:
  	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
  	    break;
  	}
  	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
  
  	data->fan_min[nr] = FAN_TO_REG(min, val);
  	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
  			 data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  
  	return count;
  }

  static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 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_input, 1);
  static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
  static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);

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

  			   char *buf)

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	return sprintf(buf, "%d
  ", data->alarms);
  }

  static DEVICE_ATTR_RO(alarms);

  static ssize_t cpu0_vid_show(struct device *dev,
  			     struct device_attribute *attr, char *buf)

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	return sprintf(buf, "%d
  ", vid_from_reg(data->vid, data->vrm));
  }

  static DEVICE_ATTR_RO(cpu0_vid);

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

  			char *buf)

  {

  	struct lm87_data *data = dev_get_drvdata(dev);

  	return sprintf(buf, "%d
  ", data->vrm);
  }

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

  {

  	struct lm87_data *data = dev_get_drvdata(dev);

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

  
  	if (val > 255)
  		return -EINVAL;

  	data->vrm = val;

  	return count;
  }

  static DEVICE_ATTR_RW(vrm);

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

  {
  	struct lm87_data *data = lm87_update_device(dev);
  	return sprintf(buf, "%d
  ", AOUT_FROM_REG(data->aout));
  }

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

  {

  	struct i2c_client *client = dev_get_drvdata(dev);

  	struct lm87_data *data = i2c_get_clientdata(client);

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

  	mutex_lock(&data->update_lock);

  	data->aout = AOUT_TO_REG(val);
  	lm87_write_value(client, LM87_REG_AOUT, data->aout);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static DEVICE_ATTR_RW(aout_output);

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

  			  char *buf)
  {
  	struct lm87_data *data = lm87_update_device(dev);
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	return sprintf(buf, "%u
  ", (data->alarms >> bitnr) & 1);
  }

  static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
  static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
  static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
  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, 9);
  static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);
  static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
  static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
  static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
  static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
  static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
  static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
  static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
  static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);

  /*
   * Real code
   */

  static struct attribute *lm87_attributes[] = {

  	&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,

  	&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,

  	&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,

  	&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,

  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_min.dev_attr.attr,

  	&dev_attr_temp1_crit.attr,

  	&sensor_dev_attr_temp1_alarm.dev_attr.attr,

  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_min.dev_attr.attr,

  	&dev_attr_temp2_crit.attr,

  	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_fault.dev_attr.attr,

  
  	&dev_attr_alarms.attr,
  	&dev_attr_aout_output.attr,
  
  	NULL
  };
  
  static const struct attribute_group lm87_group = {
  	.attrs = lm87_attributes,
  };

  static struct attribute *lm87_attributes_in6[] = {

  	&sensor_dev_attr_in6_input.dev_attr.attr,
  	&sensor_dev_attr_in6_min.dev_attr.attr,
  	&sensor_dev_attr_in6_max.dev_attr.attr,

  	&sensor_dev_attr_in6_alarm.dev_attr.attr,

  	NULL
  };
  
  static const struct attribute_group lm87_group_in6 = {
  	.attrs = lm87_attributes_in6,
  };

  static struct attribute *lm87_attributes_fan1[] = {

  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan1_div.dev_attr.attr,

  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,

  	NULL
  };
  
  static const struct attribute_group lm87_group_fan1 = {
  	.attrs = lm87_attributes_fan1,
  };

  static struct attribute *lm87_attributes_in7[] = {

  	&sensor_dev_attr_in7_input.dev_attr.attr,
  	&sensor_dev_attr_in7_min.dev_attr.attr,
  	&sensor_dev_attr_in7_max.dev_attr.attr,

  	&sensor_dev_attr_in7_alarm.dev_attr.attr,

  	NULL
  };

  static const struct attribute_group lm87_group_in7 = {
  	.attrs = lm87_attributes_in7,
  };
  
  static struct attribute *lm87_attributes_fan2[] = {

  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_div.dev_attr.attr,

  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,

  	NULL
  };

  static const struct attribute_group lm87_group_fan2 = {
  	.attrs = lm87_attributes_fan2,
  };
  
  static struct attribute *lm87_attributes_temp3[] = {

  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_min.dev_attr.attr,

  	&dev_attr_temp3_crit.attr,

  	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_fault.dev_attr.attr,

  	NULL
  };

  static const struct attribute_group lm87_group_temp3 = {
  	.attrs = lm87_attributes_temp3,
  };
  
  static struct attribute *lm87_attributes_in0_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,

  	&sensor_dev_attr_in5_input.dev_attr.attr,
  	&sensor_dev_attr_in5_min.dev_attr.attr,
  	&sensor_dev_attr_in5_max.dev_attr.attr,

  	&sensor_dev_attr_in5_alarm.dev_attr.attr,

  	NULL
  };
  
  static const struct attribute_group lm87_group_in0_5 = {
  	.attrs = lm87_attributes_in0_5,
  };

  static struct attribute *lm87_attributes_vid[] = {

  	&dev_attr_cpu0_vid.attr,
  	&dev_attr_vrm.attr,

  	NULL
  };

  static const struct attribute_group lm87_group_vid = {
  	.attrs = lm87_attributes_vid,

  };

  /* Return 0 if detection is successful, -ENODEV otherwise */

  static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)

  {

  	struct i2c_adapter *adapter = client->adapter;

  	const char *name;
  	u8 cid, rev;

  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

  		return -ENODEV;

  	if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)

  		return -ENODEV;

  
  	/* Now, we do the remaining detection. */

  	cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
  	rev = lm87_read_value(client, LM87_REG_REVISION);

  
  	if (cid == 0x02			/* National Semiconductor */
  	 && (rev >= 0x01 && rev <= 0x08))
  		name = "lm87";
  	else if (cid == 0x41		/* Analog Devices */
  	      && (rev & 0xf0) == 0x10)
  		name = "adm1024";
  	else {
  		dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x
  ",

  			client->addr);

  		return -ENODEV;

  	}

  	strlcpy(info->type, name, I2C_NAME_SIZE);

  
  	return 0;
  }

  static void lm87_restore_config(void *arg)

  {

  	struct i2c_client *client = arg;
  	struct lm87_data *data = i2c_get_clientdata(client);
  
  	lm87_write_value(client, LM87_REG_CONFIG, data->config);

  }

  static int lm87_init_client(struct i2c_client *client)

  {
  	struct lm87_data *data = i2c_get_clientdata(client);

  	int rc;

  	struct device_node *of_node = client->dev.of_node;
  	u8 val = 0;
  	struct regulator *vcc = NULL;
  
  	if (of_node) {
  		if (of_property_read_bool(of_node, "has-temp3"))
  			val |= CHAN_TEMP3;
  		if (of_property_read_bool(of_node, "has-in6"))
  			val |= CHAN_NO_FAN(0);
  		if (of_property_read_bool(of_node, "has-in7"))
  			val |= CHAN_NO_FAN(1);
  		vcc = devm_regulator_get_optional(&client->dev, "vcc");
  		if (!IS_ERR(vcc)) {
  			if (regulator_get_voltage(vcc) == 5000000)
  				val |= CHAN_VCC_5V;
  		}
  		data->channel = val;
  		lm87_write_value(client,
  				LM87_REG_CHANNEL_MODE, data->channel);
  	} else if (dev_get_platdata(&client->dev)) {

  		data->channel = *(u8 *)dev_get_platdata(&client->dev);

  		lm87_write_value(client,
  				 LM87_REG_CHANNEL_MODE, data->channel);
  	} else {
  		data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
  	}
  	data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;

  	rc = devm_add_action(&client->dev, lm87_restore_config, client);
  	if (rc)
  		return rc;

  	if (!(data->config & 0x01)) {
  		int i;
  
  		/* Limits are left uninitialized after power-up */
  		for (i = 1; i < 6; i++) {
  			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
  			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
  		}
  		for (i = 0; i < 2; i++) {
  			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
  			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
  			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
  			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
  		}
  		if (data->channel & CHAN_TEMP3) {
  			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
  			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
  		} else {
  			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
  			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
  		}
  	}
  
  	/* Make sure Start is set and INT#_Clear is clear */
  	if ((data->config & 0x09) != 0x01)
  		lm87_write_value(client, LM87_REG_CONFIG,
  				 (data->config & 0x77) | 0x01);

  	return 0;

  }

  static int lm87_probe(struct i2c_client *client)

  {
  	struct lm87_data *data;

  	struct device *hwmon_dev;

  	int err;

  	unsigned int group_tail = 0;

  	data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;

  	i2c_set_clientdata(client, data);

  	mutex_init(&data->update_lock);

  	/* Initialize the LM87 chip */

  	err = lm87_init_client(client);
  	if (err)
  		return err;

  
  	data->in_scale[0] = 2500;
  	data->in_scale[1] = 2700;
  	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
  	data->in_scale[3] = 5000;
  	data->in_scale[4] = 12000;
  	data->in_scale[5] = 2700;
  	data->in_scale[6] = 1875;
  	data->in_scale[7] = 1875;

  	/*
  	 * Construct the list of attributes, the list depends on the
  	 * configuration of the chip
  	 */
  	data->attr_groups[group_tail++] = &lm87_group;
  	if (data->channel & CHAN_NO_FAN(0))
  		data->attr_groups[group_tail++] = &lm87_group_in6;
  	else
  		data->attr_groups[group_tail++] = &lm87_group_fan1;
  
  	if (data->channel & CHAN_NO_FAN(1))
  		data->attr_groups[group_tail++] = &lm87_group_in7;
  	else
  		data->attr_groups[group_tail++] = &lm87_group_fan2;
  
  	if (data->channel & CHAN_TEMP3)
  		data->attr_groups[group_tail++] = &lm87_group_temp3;
  	else
  		data->attr_groups[group_tail++] = &lm87_group_in0_5;

  
  	if (!(data->channel & CHAN_NO_VID)) {

  		data->vrm = vid_which_vrm();

  		data->attr_groups[group_tail++] = &lm87_group_vid;

  	}

  	hwmon_dev = devm_hwmon_device_register_with_groups(
  	    &client->dev, client->name, client, data->attr_groups);
  	return PTR_ERR_OR_ZERO(hwmon_dev);

  }

  /*
   * Driver data (common to all clients)
   */

  static const struct i2c_device_id lm87_id[] = {

  	{ "lm87", 0 },
  	{ "adm1024", 0 },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, lm87_id);

  static const struct of_device_id lm87_of_match[] = {
  	{ .compatible = "ti,lm87" },
  	{ .compatible = "adi,adm1024" },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, lm87_of_match);

  static struct i2c_driver lm87_driver = {
  	.class		= I2C_CLASS_HWMON,
  	.driver = {
  		.name	= "lm87",

  		.of_match_table = lm87_of_match,

  	},

  	.probe_new	= lm87_probe,

  	.id_table	= lm87_id,
  	.detect		= lm87_detect,
  	.address_list	= normal_i2c,
  };

  module_i2c_driver(lm87_driver);

  MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");

  MODULE_DESCRIPTION("LM87 driver");
  MODULE_LICENSE("GPL");