text: // SPDX-License-Identifier: GPL-2.0-or-later
  /*
   *	w1_therm.c
   *
   * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
   */
  
  #include <asm/types.h>
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/sched.h>
  #include <linux/device.h>
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <linux/delay.h>
  #include <linux/hwmon.h>
  #include <linux/string.h>
  #include <linux/jiffies.h>
  
  #include <linux/w1.h>
  
  #define W1_THERM_DS18S20	0x10
  #define W1_THERM_DS1822		0x22
  #define W1_THERM_DS18B20	0x28
  #define W1_THERM_DS1825		0x3B
  #define W1_THERM_DS28EA00	0x42
  
  /*
   * Allow the strong pullup to be disabled, but default to enabled.
   * If it was disabled a parasite powered device might not get the require
   * current to do a temperature conversion.  If it is enabled parasite powered
   * devices have a better chance of getting the current required.
   * In case the parasite power-detection is not working (seems to be the case
   * for some DS18S20) the strong pullup can also be forced, regardless of the
   * power state of the devices.
   *
   * Summary of options:
   * - strong_pullup = 0	Disable strong pullup completely
   * - strong_pullup = 1	Enable automatic strong pullup detection
   * - strong_pullup = 2	Force strong pullup
   */
  static int w1_strong_pullup = 1;
  module_param_named(strong_pullup, w1_strong_pullup, int, 0);
  
  /* Counter for devices supporting bulk reading */
  static u16 bulk_read_device_counter; /* =0 as per C standard */
  
  /* This command should be in public header w1.h but is not */
  #define W1_RECALL_EEPROM	0xB8
  
  /* Nb of try for an operation */
  #define W1_THERM_MAX_TRY		5
  
  /* ms delay to retry bus mutex */
  #define W1_THERM_RETRY_DELAY		20
  
  /* delay in ms to write in EEPROM */
  #define W1_THERM_EEPROM_WRITE_DELAY	10
  
  #define EEPROM_CMD_WRITE    "save"	/* cmd for write eeprom sysfs */
  #define EEPROM_CMD_READ     "restore"	/* cmd for read eeprom sysfs */
  #define BULK_TRIGGER_CMD    "trigger"	/* cmd to trigger a bulk read */
  
  #define MIN_TEMP	-55	/* min temperature that can be mesured */
  #define MAX_TEMP	125	/* max temperature that can be mesured */
  
  /* Allowed values for sysfs conv_time attribute */
  #define CONV_TIME_DEFAULT 0
  #define CONV_TIME_MEASURE 1
  
  /* Bits in sysfs "features" value */
  #define W1_THERM_CHECK_RESULT 1	/* Enable conversion success check */
  #define W1_THERM_POLL_COMPLETION 2	/* Poll for conversion completion */
  #define W1_THERM_FEATURES_MASK 3		/* All values mask */
  
  /* Poll period in milliseconds. Should be less then a shortest operation on the device */
  #define W1_POLL_PERIOD 32
  #define W1_POLL_CONVERT_TEMP 2000	/* Timeout for W1_CONVERT_TEMP, ms */
  #define W1_POLL_RECALL_EEPROM 500	/* Timeout for W1_RECALL_EEPROM, ms*/
  
  /* Masks for resolution functions, work with all devices */
  /* Bit mask for config register for all devices, bits 7,6,5 */
  #define W1_THERM_RESOLUTION_MASK 0xE0
  /* Bit offset of resolution in config register for all devices */
  #define W1_THERM_RESOLUTION_SHIFT 5
  /* Bit offset of resolution in config register for all devices */
  #define W1_THERM_RESOLUTION_SHIFT 5
  /* Add this to bit value to get resolution */
  #define W1_THERM_RESOLUTION_MIN 9
  /* Maximum allowed value */
  #define W1_THERM_RESOLUTION_MAX 14
  
  /* Helpers Macros */
  
  /*
   * return a pointer on the slave w1_therm_family_converter struct:
   * always test family data existence before using this macro
   */
  #define SLAVE_SPECIFIC_FUNC(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->specific_functions)
  
  /*
   * return the power mode of the sl slave : 1-ext, 0-parasite, <0 unknown
   * always test family data existence before using this macro
   */
  #define SLAVE_POWERMODE(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->external_powered)
  
  /*
   * return the resolution in bit of the sl slave : <0 unknown
   * always test family data existence before using this macro
   */
  #define SLAVE_RESOLUTION(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->resolution)
  
  /*
   * return the conv_time_override of the sl slave
   * always test family data existence before using this macro
   */
   #define SLAVE_CONV_TIME_OVERRIDE(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->conv_time_override)
  
  /*
   * return the features of the sl slave
   * always test family data existence before using this macro
   */
   #define SLAVE_FEATURES(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->features)
  
  /*
   * return whether or not a converT command has been issued to the slave
   * * 0: no bulk read is pending
   * * -1: conversion is in progress
   * * 1: conversion done, result to be read
   */
  #define SLAVE_CONVERT_TRIGGERED(sl) \
  	(((struct w1_therm_family_data *)(sl->family_data))->convert_triggered)
  
  /* return the address of the refcnt in the family data */
  #define THERM_REFCNT(family_data) \
  	(&((struct w1_therm_family_data *)family_data)->refcnt)
  
  /* Structs definition */
  
  /**
   * struct w1_therm_family_converter - bind device specific functions
   * @broken: flag for non-registred families
   * @reserved: not used here
   * @f: pointer to the device binding structure
   * @convert: pointer to the device conversion function
   * @get_conversion_time: pointer to the device conversion time function
   * @set_resolution: pointer to the device set_resolution function
   * @get_resolution: pointer to the device get_resolution function
   * @write_data: pointer to the device writing function (2 or 3 bytes)
   * @bulk_read: true if device family support bulk read, false otherwise
   */
  struct w1_therm_family_converter {
  	u8		broken;
  	u16		reserved;
  	struct w1_family	*f;
  	int		(*convert)(u8 rom[9]);
  	int		(*get_conversion_time)(struct w1_slave *sl);
  	int		(*set_resolution)(struct w1_slave *sl, int val);
  	int		(*get_resolution)(struct w1_slave *sl);
  	int		(*write_data)(struct w1_slave *sl, const u8 *data);
  	bool		bulk_read;
  };
  
  /**
   * struct w1_therm_family_data - device data
   * @rom: ROM device id (64bit Lasered ROM code + 1 CRC byte)
   * @refcnt: ref count
   * @external_powered:	1 device powered externally,
   *				0 device parasite powered,
   *				-x error or undefined
   * @resolution: current device resolution
   * @convert_triggered: conversion state of the device
   * @conv_time_override: user selected conversion time or CONV_TIME_DEFAULT
   * @features: bit mask - enable temperature validity check, poll for completion
   * @specific_functions: pointer to struct of device specific function
   */
  struct w1_therm_family_data {
  	uint8_t rom[9];
  	atomic_t refcnt;
  	int external_powered;
  	int resolution;
  	int convert_triggered;
  	int conv_time_override;
  	unsigned int features;
  	struct w1_therm_family_converter *specific_functions;
  };
  
  /**
   * struct therm_info - store temperature reading
   * @rom: read device data (8 data bytes + 1 CRC byte)
   * @crc: computed crc from rom
   * @verdict: 1 crc checked, 0 crc not matching
   */
  struct therm_info {
  	u8 rom[9];
  	u8 crc;
  	u8 verdict;
  };
  
  /* Hardware Functions declaration */
  
  /**
   * reset_select_slave() - reset and select a slave
   * @sl: the slave to select
   *
   * Resets the bus and select the slave by sending a ROM MATCH cmd
   * w1_reset_select_slave() from w1_io.c could not be used here because
   * it sent a SKIP ROM command if only one device is on the line.
   * At the beginning of the such process, sl->master->slave_count is 1 even if
   * more devices are on the line, causing collision on the line.
   *
   * Context: The w1 master lock must be held.
   *
   * Return: 0 if success, negative kernel error code otherwise.
   */
  static int reset_select_slave(struct w1_slave *sl);
  
  /**
   * convert_t() - Query the device for temperature conversion and read
   * @sl: pointer to the slave to read
   * @info: pointer to a structure to store the read results
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int convert_t(struct w1_slave *sl, struct therm_info *info);
  
  /**
   * read_scratchpad() - read the data in device RAM
   * @sl: pointer to the slave to read
   * @info: pointer to a structure to store the read results
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int read_scratchpad(struct w1_slave *sl, struct therm_info *info);
  
  /**
   * write_scratchpad() - write nb_bytes in the device RAM
   * @sl: pointer to the slave to write in
   * @data: pointer to an array of 3 bytes, as 3 bytes MUST be written
   * @nb_bytes: number of bytes to be written (2 for DS18S20, 3 otherwise)
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes);
  
  /**
   * copy_scratchpad() - Copy the content of scratchpad in device EEPROM
   * @sl: slave involved
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int copy_scratchpad(struct w1_slave *sl);
  
  /**
   * recall_eeprom() - Restore EEPROM data to device RAM
   * @sl: slave involved
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int recall_eeprom(struct w1_slave *sl);
  
  /**
   * read_powermode() - Query the power mode of the slave
   * @sl: slave to retrieve the power mode
   *
   * Ask the device to get its power mode (external or parasite)
   * and store the power status in the &struct w1_therm_family_data.
   *
   * Return:
   * * 0 parasite powered device
   * * 1 externally powered device
   * * <0 kernel error code
   */
  static int read_powermode(struct w1_slave *sl);
  
  /**
   * trigger_bulk_read() - function to trigger a bulk read on the bus
   * @dev_master: the device master of the bus
   *
   * Send a SKIP ROM follow by a CONVERT T commmand on the bus.
   * It also set the status flag in each slave &struct w1_therm_family_data
   * to signal that a conversion is in progress.
   *
   * Return: 0 if success, -kernel error code otherwise
   */
  static int trigger_bulk_read(struct w1_master *dev_master);
  
  /* Sysfs interface declaration */
  
  static ssize_t w1_slave_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t w1_slave_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size);
  
  static ssize_t w1_seq_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t temperature_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t ext_power_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t resolution_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t resolution_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size);
  
  static ssize_t eeprom_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size);
  
  static ssize_t alarms_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size);
  
  static ssize_t alarms_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t therm_bulk_read_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size);
  
  static ssize_t therm_bulk_read_show(struct device *device,
  	struct device_attribute *attr, char *buf);
  
  static ssize_t conv_time_show(struct device *device,
  			      struct device_attribute *attr, char *buf);
  
  static ssize_t conv_time_store(struct device *device,
  			       struct device_attribute *attr, const char *buf,
  			       size_t size);
  
  static ssize_t features_show(struct device *device,
  			      struct device_attribute *attr, char *buf);
  
  static ssize_t features_store(struct device *device,
  			       struct device_attribute *attr, const char *buf,
  			       size_t size);
  /* Attributes declarations */
  
  static DEVICE_ATTR_RW(w1_slave);
  static DEVICE_ATTR_RO(w1_seq);
  static DEVICE_ATTR_RO(temperature);
  static DEVICE_ATTR_RO(ext_power);
  static DEVICE_ATTR_RW(resolution);
  static DEVICE_ATTR_WO(eeprom);
  static DEVICE_ATTR_RW(alarms);
  static DEVICE_ATTR_RW(conv_time);
  static DEVICE_ATTR_RW(features);
  
  static DEVICE_ATTR_RW(therm_bulk_read); /* attribut at master level */
  
  /* Interface Functions declaration */
  
  /**
   * w1_therm_add_slave() - Called when a new slave is discovered
   * @sl: slave just discovered by the master.
   *
   * Called by the master when the slave is discovered on the bus. Used to
   * initialize slave state before the beginning of any communication.
   *
   * Return: 0 - If success, negative kernel code otherwise
   */
  static int w1_therm_add_slave(struct w1_slave *sl);
  
  /**
   * w1_therm_remove_slave() - Called when a slave is removed
   * @sl: slave to be removed.
   *
   * Called by the master when the slave is considered not to be on the bus
   * anymore. Used to free memory.
   */
  static void w1_therm_remove_slave(struct w1_slave *sl);
  
  /* Family attributes */
  
  static struct attribute *w1_therm_attrs[] = {
  	&dev_attr_w1_slave.attr,
  	&dev_attr_temperature.attr,
  	&dev_attr_ext_power.attr,
  	&dev_attr_resolution.attr,
  	&dev_attr_eeprom.attr,
  	&dev_attr_alarms.attr,
  	&dev_attr_conv_time.attr,
  	&dev_attr_features.attr,
  	NULL,
  };
  
  static struct attribute *w1_ds18s20_attrs[] = {
  	&dev_attr_w1_slave.attr,
  	&dev_attr_temperature.attr,
  	&dev_attr_ext_power.attr,
  	&dev_attr_eeprom.attr,
  	&dev_attr_alarms.attr,
  	&dev_attr_conv_time.attr,
  	&dev_attr_features.attr,
  	NULL,
  };
  
  static struct attribute *w1_ds28ea00_attrs[] = {
  	&dev_attr_w1_slave.attr,
  	&dev_attr_w1_seq.attr,
  	&dev_attr_temperature.attr,
  	&dev_attr_ext_power.attr,
  	&dev_attr_resolution.attr,
  	&dev_attr_eeprom.attr,
  	&dev_attr_alarms.attr,
  	&dev_attr_conv_time.attr,
  	&dev_attr_features.attr,
  	NULL,
  };
  
  /* Attribute groups */
  
  ATTRIBUTE_GROUPS(w1_therm);
  ATTRIBUTE_GROUPS(w1_ds18s20);
  ATTRIBUTE_GROUPS(w1_ds28ea00);
  
  #if IS_REACHABLE(CONFIG_HWMON)
  static int w1_read_temp(struct device *dev, u32 attr, int channel,
  			long *val);
  
  static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type,
  			     u32 attr, int channel)
  {
  	return attr == hwmon_temp_input ? 0444 : 0;
  }
  
  static int w1_read(struct device *dev, enum hwmon_sensor_types type,
  		   u32 attr, int channel, long *val)
  {
  	switch (type) {
  	case hwmon_temp:
  		return w1_read_temp(dev, attr, channel, val);
  	default:
  		return -EOPNOTSUPP;
  	}
  }
  
  static const u32 w1_temp_config[] = {
  	HWMON_T_INPUT,
  	0
  };
  
  static const struct hwmon_channel_info w1_temp = {
  	.type = hwmon_temp,
  	.config = w1_temp_config,
  };
  
  static const struct hwmon_channel_info *w1_info[] = {
  	&w1_temp,
  	NULL
  };
  
  static const struct hwmon_ops w1_hwmon_ops = {
  	.is_visible = w1_is_visible,
  	.read = w1_read,
  };
  
  static const struct hwmon_chip_info w1_chip_info = {
  	.ops = &w1_hwmon_ops,
  	.info = w1_info,
  };
  #define W1_CHIPINFO	(&w1_chip_info)
  #else
  #define W1_CHIPINFO	NULL
  #endif
  
  /* Family operations */
  
  static const struct w1_family_ops w1_therm_fops = {
  	.add_slave	= w1_therm_add_slave,
  	.remove_slave	= w1_therm_remove_slave,
  	.groups		= w1_therm_groups,
  	.chip_info	= W1_CHIPINFO,
  };
  
  static const struct w1_family_ops w1_ds18s20_fops = {
  	.add_slave	= w1_therm_add_slave,
  	.remove_slave	= w1_therm_remove_slave,
  	.groups		= w1_ds18s20_groups,
  	.chip_info	= W1_CHIPINFO,
  };
  
  static const struct w1_family_ops w1_ds28ea00_fops = {
  	.add_slave	= w1_therm_add_slave,
  	.remove_slave	= w1_therm_remove_slave,
  	.groups		= w1_ds28ea00_groups,
  	.chip_info	= W1_CHIPINFO,
  };
  
  /* Family binding operations struct */
  
  static struct w1_family w1_therm_family_DS18S20 = {
  	.fid = W1_THERM_DS18S20,
  	.fops = &w1_ds18s20_fops,
  };
  
  static struct w1_family w1_therm_family_DS18B20 = {
  	.fid = W1_THERM_DS18B20,
  	.fops = &w1_therm_fops,
  };
  
  static struct w1_family w1_therm_family_DS1822 = {
  	.fid = W1_THERM_DS1822,
  	.fops = &w1_therm_fops,
  };
  
  static struct w1_family w1_therm_family_DS28EA00 = {
  	.fid = W1_THERM_DS28EA00,
  	.fops = &w1_ds28ea00_fops,
  };
  
  static struct w1_family w1_therm_family_DS1825 = {
  	.fid = W1_THERM_DS1825,
  	.fops = &w1_therm_fops,
  };
  
  /* Device dependent func */
  
  static inline int w1_DS18B20_convert_time(struct w1_slave *sl)
  {
  	int ret;
  
  	if (!sl->family_data)
  		return -ENODEV;	/* device unknown */
  
  	if (SLAVE_CONV_TIME_OVERRIDE(sl) != CONV_TIME_DEFAULT)
  		return SLAVE_CONV_TIME_OVERRIDE(sl);
  
  	/* Return the conversion time, depending on resolution,
  	 * select maximum conversion time among all compatible devices
  	 */
  	switch (SLAVE_RESOLUTION(sl)) {
  	case 9:
  		ret = 95;
  		break;
  	case 10:
  		ret = 190;
  		break;
  	case 11:
  		ret = 375;
  		break;
  	case 12:
  		ret = 750;
  		break;
  	case 13:
  		ret = 850;  /* GX20MH01 only. Datasheet says 500ms, but that's not enough. */
  		break;
  	case 14:
  		ret = 1600; /* GX20MH01 only. Datasheet says 1000ms - not enough */
  		break;
  	default:
  		ret = 750;
  	}
  	return ret;
  }
  
  static inline int w1_DS18S20_convert_time(struct w1_slave *sl)
  {
  	if (!sl->family_data)
  		return -ENODEV;	/* device unknown */
  
  	if (SLAVE_CONV_TIME_OVERRIDE(sl) == CONV_TIME_DEFAULT)
  		return 750; /* default for DS18S20 */
  	else
  		return SLAVE_CONV_TIME_OVERRIDE(sl);
  }
  
  static inline int w1_DS18B20_write_data(struct w1_slave *sl,
  				const u8 *data)
  {
  	return write_scratchpad(sl, data, 3);
  }
  
  static inline int w1_DS18S20_write_data(struct w1_slave *sl,
  				const u8 *data)
  {
  	/* No config register */
  	return write_scratchpad(sl, data, 2);
  }
  
  static inline int w1_DS18B20_set_resolution(struct w1_slave *sl, int val)
  {
  	int ret;
  	struct therm_info info, info2;
  
  	/* DS18B20 resolution is 9 to 12 bits */
  	/* GX20MH01 resolution is 9 to 14 bits */
  	if (val < W1_THERM_RESOLUTION_MIN || val > W1_THERM_RESOLUTION_MAX)
  		return -EINVAL;
  
  	/* Calc bit value from resolution */
  	val = (val - W1_THERM_RESOLUTION_MIN) << W1_THERM_RESOLUTION_SHIFT;
  
  	/*
  	 * Read the scratchpad to change only the required bits
  	 * (bit5 & bit 6 from byte 4)
  	 */
  	ret = read_scratchpad(sl, &info);
  
  	if (ret)
  		return ret;
  
  
  	info.rom[4] &= ~W1_THERM_RESOLUTION_MASK;
  	info.rom[4] |= val;
  
  	/* Write data in the device RAM */
  	ret = w1_DS18B20_write_data(sl, info.rom + 2);
  	if (ret)
  		return ret;
  
  	/* Have to read back the resolution to verify an actual value
  	 * GX20MH01 and DS18B20 are indistinguishable by family number, but resolutions differ
  	 * Some DS18B20 clones don't support resolution change
  	 */
  	ret = read_scratchpad(sl, &info2);
  	if (ret)
  		/* Scratchpad read fail */
  		return ret;
  
  	if ((info2.rom[4] & W1_THERM_RESOLUTION_MASK) == (info.rom[4] & W1_THERM_RESOLUTION_MASK))
  		return 0;
  
  	/* Resolution verify error */
  	return -EIO;
  }
  
  static inline int w1_DS18B20_get_resolution(struct w1_slave *sl)
  {
  	int ret;
  	int resolution;
  	struct therm_info info;
  
  	ret = read_scratchpad(sl, &info);
  
  	if (ret)
  		return ret;
  
  	resolution = ((info.rom[4] & W1_THERM_RESOLUTION_MASK) >> W1_THERM_RESOLUTION_SHIFT)
  		+ W1_THERM_RESOLUTION_MIN;
  	/* GX20MH01 has one special case:
  	 *   >=14 means 14 bits when getting resolution from bit value.
  	 * Other devices have no more then 12 bits.
  	 */
  	if (resolution > W1_THERM_RESOLUTION_MAX)
  		resolution = W1_THERM_RESOLUTION_MAX;
  
  	return resolution;
  }
  
  /**
   * w1_DS18B20_convert_temp() - temperature computation for DS18B20
   * @rom: data read from device RAM (8 data bytes + 1 CRC byte)
   *
   * Can be called for any DS18B20 compliant device.
   *
   * Return: value in millidegrees Celsius.
   */
  static inline int w1_DS18B20_convert_temp(u8 rom[9])
  {
  	int t;
  	u32 bv;
  
  	/* Config register bit R2 = 1 - GX20MH01 in 13 or 14 bit resolution mode */
  	if (rom[4] & 0x80) {
  		/* Signed 16-bit value to unsigned, cpu order */
  		bv = le16_to_cpup((__le16 *)rom);
  
  		/* Insert two temperature bits from config register */
  		/* Avoid arithmetic shift of signed value */
  		bv = (bv << 2) | (rom[4] & 3);
  
  		t = (int) sign_extend32(bv, 17); /* Degrees, lowest bit is 2^-6 */
  		return (t*1000)/64;  /* Millidegrees */
  	}
  
  	t = (int)le16_to_cpup((__le16 *)rom);
  	return t*1000/16;
  }
  
  
  
  /**
   * w1_DS18S20_convert_temp() - temperature computation for DS18S20
   * @rom: data read from device RAM (8 data bytes + 1 CRC byte)
   *
   * Can be called for any DS18S20 compliant device.
   *
   * Return: value in millidegrees Celsius.
   */
  static inline int w1_DS18S20_convert_temp(u8 rom[9])
  {
  	int t, h;
  
  	if (!rom[7]) {
  		pr_debug("%s: Invalid argument for conversion\n", __func__);
  		return 0;
  	}
  
  	if (rom[1] == 0)
  		t = ((s32)rom[0] >> 1)*1000;
  	else
  		t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);
  
  	t -= 250;
  	h = 1000*((s32)rom[7] - (s32)rom[6]);
  	h /= (s32)rom[7];
  	t += h;
  
  	return t;
  }
  
  /* Device capability description */
  /* GX20MH01 device shares family number and structure with DS18B20 */
  
  static struct w1_therm_family_converter w1_therm_families[] = {
  	{
  		.f				= &w1_therm_family_DS18S20,
  		.convert			= w1_DS18S20_convert_temp,
  		.get_conversion_time	= w1_DS18S20_convert_time,
  		.set_resolution		= NULL,	/* no config register */
  		.get_resolution		= NULL,	/* no config register */
  		.write_data			= w1_DS18S20_write_data,
  		.bulk_read			= true
  	},
  	{
  		.f				= &w1_therm_family_DS1822,
  		.convert			= w1_DS18B20_convert_temp,
  		.get_conversion_time	= w1_DS18B20_convert_time,
  		.set_resolution		= w1_DS18B20_set_resolution,
  		.get_resolution		= w1_DS18B20_get_resolution,
  		.write_data			= w1_DS18B20_write_data,
  		.bulk_read			= true
  	},
  	{
  		/* Also used for GX20MH01 */
  		.f				= &w1_therm_family_DS18B20,
  		.convert			= w1_DS18B20_convert_temp,
  		.get_conversion_time	= w1_DS18B20_convert_time,
  		.set_resolution		= w1_DS18B20_set_resolution,
  		.get_resolution		= w1_DS18B20_get_resolution,
  		.write_data			= w1_DS18B20_write_data,
  		.bulk_read			= true
  	},
  	{
  		.f				= &w1_therm_family_DS28EA00,
  		.convert			= w1_DS18B20_convert_temp,
  		.get_conversion_time	= w1_DS18B20_convert_time,
  		.set_resolution		= w1_DS18B20_set_resolution,
  		.get_resolution		= w1_DS18B20_get_resolution,
  		.write_data			= w1_DS18B20_write_data,
  		.bulk_read			= false
  	},
  	{
  		.f				= &w1_therm_family_DS1825,
  		.convert			= w1_DS18B20_convert_temp,
  		.get_conversion_time	= w1_DS18B20_convert_time,
  		.set_resolution		= w1_DS18B20_set_resolution,
  		.get_resolution		= w1_DS18B20_get_resolution,
  		.write_data			= w1_DS18B20_write_data,
  		.bulk_read			= true
  	}
  };
  
  /* Helpers Functions */
  
  /**
   * device_family() - Retrieve a pointer on &struct w1_therm_family_converter
   * @sl: slave to retrieve the device specific structure
   *
   * Return: pointer to the slaves's family converter, NULL if not known
   */
  static struct w1_therm_family_converter *device_family(struct w1_slave *sl)
  {
  	struct w1_therm_family_converter *ret = NULL;
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
  		if (w1_therm_families[i].f->fid == sl->family->fid) {
  			ret = &w1_therm_families[i];
  			break;
  		}
  	}
  	return ret;
  }
  
  /**
   * bus_mutex_lock() - Acquire the mutex
   * @lock: w1 bus mutex to acquire
   *
   * It try to acquire the mutex W1_THERM_MAX_TRY times and wait
   * W1_THERM_RETRY_DELAY between 2 attempts.
   *
   * Return: true is mutex is acquired and lock, false otherwise
   */
  static inline bool bus_mutex_lock(struct mutex *lock)
  {
  	int max_trying = W1_THERM_MAX_TRY;
  
  	/* try to acquire the mutex, if not, sleep retry_delay before retry) */
  	while (mutex_lock_interruptible(lock) != 0 && max_trying > 0) {
  		unsigned long sleep_rem;
  
  		sleep_rem = msleep_interruptible(W1_THERM_RETRY_DELAY);
  		if (!sleep_rem)
  			max_trying--;
  	}
  
  	if (!max_trying)
  		return false;	/* Didn't acquire the bus mutex */
  
  	return true;
  }
  
  /**
   * check_family_data() - Check if family data and specific functions are present
   * @sl: W1 device data
   *
   * Return: 0 - OK, negative value - error
   */
  static int check_family_data(struct w1_slave *sl)
  {
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(&sl->dev,
  			 "%s: Device is not supported by the driver\n", __func__);
  		return -EINVAL;  /* No device family */
  	}
  	return 0;
  }
  
  /**
   * support_bulk_read() - check if slave support bulk read
   * @sl: device to check the ability
   *
   * Return: true if bulk read is supported, false if not or error
   */
  static inline bool bulk_read_support(struct w1_slave *sl)
  {
  	if (SLAVE_SPECIFIC_FUNC(sl))
  		return SLAVE_SPECIFIC_FUNC(sl)->bulk_read;
  
  	dev_info(&sl->dev,
  		"%s: Device not supported by the driver\n", __func__);
  
  	return false;  /* No device family */
  }
  
  /**
   * conversion_time() - get the Tconv for the slave
   * @sl: device to get the conversion time
   *
   * On device supporting resolution settings, conversion time depend
   * on the resolution setting. This helper function get the slave timing,
   * depending on its current setting.
   *
   * Return: conversion time in ms, negative values are kernel error code
   */
  static inline int conversion_time(struct w1_slave *sl)
  {
  	if (SLAVE_SPECIFIC_FUNC(sl))
  		return SLAVE_SPECIFIC_FUNC(sl)->get_conversion_time(sl);
  
  	dev_info(&sl->dev,
  		"%s: Device not supported by the driver\n", __func__);
  
  	return -ENODEV;  /* No device family */
  }
  
  /**
   * temperature_from_RAM() - Convert the read info to temperature
   * @sl: device that sent the RAM data
   * @rom: read value on the slave device RAM
   *
   * Device dependent, the function bind the correct computation method.
   *
   * Return: temperature in 1/1000degC, 0 on error.
   */
  static inline int temperature_from_RAM(struct w1_slave *sl, u8 rom[9])
  {
  	if (SLAVE_SPECIFIC_FUNC(sl))
  		return SLAVE_SPECIFIC_FUNC(sl)->convert(rom);
  
  	dev_info(&sl->dev,
  		"%s: Device not supported by the driver\n", __func__);
  
  	return 0;  /* No device family */
  }
  
  /**
   * int_to_short() - Safe casting of int to short
   *
   * @i: integer to be converted to short
   *
   * Device register use 1 byte to store signed integer.
   * This helper function convert the int in a signed short,
   * using the min/max values that device can measure as limits.
   * min/max values are defined by macro.
   *
   * Return: a short in the range of min/max value
   */
  static inline s8 int_to_short(int i)
  {
  	/* Prepare to cast to short by eliminating out of range values */
  	i = i > MAX_TEMP ? MAX_TEMP : i;
  	i = i < MIN_TEMP ? MIN_TEMP : i;
  	return (s8) i;
  }
  
  /* Interface Functions */
  
  static int w1_therm_add_slave(struct w1_slave *sl)
  {
  	struct w1_therm_family_converter *sl_family_conv;
  
  	/* Allocate memory */
  	sl->family_data = kzalloc(sizeof(struct w1_therm_family_data),
  		GFP_KERNEL);
  	if (!sl->family_data)
  		return -ENOMEM;
  
  	atomic_set(THERM_REFCNT(sl->family_data), 1);
  
  	/* Get a pointer to the device specific function struct */
  	sl_family_conv = device_family(sl);
  	if (!sl_family_conv) {
  		kfree(sl->family_data);
  		return -ENODEV;
  	}
  	/* save this pointer to the device structure */
  	SLAVE_SPECIFIC_FUNC(sl) = sl_family_conv;
  
  	if (bulk_read_support(sl)) {
  		/*
  		 * add the sys entry to trigger bulk_read
  		 * at master level only the 1st time
  		 */
  		if (!bulk_read_device_counter) {
  			int err = device_create_file(&sl->master->dev,
  				&dev_attr_therm_bulk_read);
  
  			if (err)
  				dev_warn(&sl->dev,
  				"%s: Device has been added, but bulk read is unavailable. err=%d\n",
  				__func__, err);
  		}
  		/* Increment the counter */
  		bulk_read_device_counter++;
  	}
  
  	/* Getting the power mode of the device {external, parasite} */
  	SLAVE_POWERMODE(sl) = read_powermode(sl);
  
  	if (SLAVE_POWERMODE(sl) < 0) {
  		/* no error returned as device has been added */
  		dev_warn(&sl->dev,
  			"%s: Device has been added, but power_mode may be corrupted. err=%d\n",
  			 __func__, SLAVE_POWERMODE(sl));
  	}
  
  	/* Getting the resolution of the device */
  	if (SLAVE_SPECIFIC_FUNC(sl)->get_resolution) {
  		SLAVE_RESOLUTION(sl) =
  			SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl);
  		if (SLAVE_RESOLUTION(sl) < 0) {
  			/* no error returned as device has been added */
  			dev_warn(&sl->dev,
  				"%s:Device has been added, but resolution may be corrupted. err=%d\n",
  				__func__, SLAVE_RESOLUTION(sl));
  		}
  	}
  
  	/* Finally initialize convert_triggered flag */
  	SLAVE_CONVERT_TRIGGERED(sl) = 0;
  
  	return 0;
  }
  
  static void w1_therm_remove_slave(struct w1_slave *sl)
  {
  	int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data));
  
  	if (bulk_read_support(sl)) {
  		bulk_read_device_counter--;
  		/* Delete the entry if no more device support the feature */
  		if (!bulk_read_device_counter)
  			device_remove_file(&sl->master->dev,
  				&dev_attr_therm_bulk_read);
  	}
  
  	while (refcnt) {
  		msleep(1000);
  		refcnt = atomic_read(THERM_REFCNT(sl->family_data));
  	}
  	kfree(sl->family_data);
  	sl->family_data = NULL;
  }
  
  /* Hardware Functions */
  
  /* Safe version of reset_select_slave - avoid using the one in w_io.c */
  static int reset_select_slave(struct w1_slave *sl)
  {
  	u8 match[9] = { W1_MATCH_ROM, };
  	u64 rn = le64_to_cpu(*((u64 *)&sl->reg_num));
  
  	if (w1_reset_bus(sl->master))
  		return -ENODEV;
  
  	memcpy(&match[1], &rn, 8);
  	w1_write_block(sl->master, match, 9);
  
  	return 0;
  }
  
  /**
   * w1_poll_completion - Poll for operation completion, with timeout
   * @dev_master: the device master of the bus
   * @tout_ms: timeout in milliseconds
   *
   * The device is answering 0's while an operation is in progress and 1's after it completes
   * Timeout may happen if the previous command was not recognised due to a line noise
   *
   * Return: 0 - OK, negative error - timeout
   */
  static int w1_poll_completion(struct w1_master *dev_master, int tout_ms)
  {
  	int i;
  
  	for (i = 0; i < tout_ms/W1_POLL_PERIOD; i++) {
  		/* Delay is before poll, for device to recognize a command */
  		msleep(W1_POLL_PERIOD);
  
  		/* Compare all 8 bits to mitigate a noise on the bus */
  		if (w1_read_8(dev_master) == 0xFF)
  			break;
  	}
  	if (i == tout_ms/W1_POLL_PERIOD)
  		return -EIO;
  
  	return 0;
  }
  
  static int convert_t(struct w1_slave *sl, struct therm_info *info)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int t_conv;
  	int ret = -ENODEV;
  	bool strong_pullup;
  
  	if (!sl->family_data)
  		goto error;
  
  	strong_pullup = (w1_strong_pullup == 2 ||
  					(!SLAVE_POWERMODE(sl) &&
  					w1_strong_pullup));
  
  	if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {
  		dev_warn(&sl->dev,
  			"%s: Disabling W1_THERM_POLL_COMPLETION in parasite power mode.\n",
  			__func__);
  		SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION;
  	}
  
  	/* get conversion duration device and id dependent */
  	t_conv = conversion_time(sl);
  
  	memset(info->rom, 0, sizeof(info->rom));
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  
  		info->verdict = 0;
  		info->crc = 0;
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			unsigned long sleep_rem;
  
  			/* 750ms strong pullup (or delay) after the convert */
  			if (strong_pullup)
  				w1_next_pullup(dev_master, t_conv);
  
  			w1_write_8(dev_master, W1_CONVERT_TEMP);
  
  			if (strong_pullup) { /*some device need pullup */
  				sleep_rem = msleep_interruptible(t_conv);
  				if (sleep_rem != 0) {
  					ret = -EINTR;
  					goto mt_unlock;
  				}
  				mutex_unlock(&dev_master->bus_mutex);
  			} else { /*no device need pullup */
  				if (SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {
  					ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP);
  					if (ret) {
  						dev_dbg(&sl->dev, "%s: Timeout\n", __func__);
  						goto mt_unlock;
  					}
  					mutex_unlock(&dev_master->bus_mutex);
  				} else {
  					/* Fixed delay */
  					mutex_unlock(&dev_master->bus_mutex);
  					sleep_rem = msleep_interruptible(t_conv);
  					if (sleep_rem != 0) {
  						ret = -EINTR;
  						goto dec_refcnt;
  					}
  				}
  			}
  			ret = read_scratchpad(sl, info);
  
  			/* If enabled, check for conversion success */
  			if ((SLAVE_FEATURES(sl) & W1_THERM_CHECK_RESULT) &&
  				(info->rom[6] == 0xC) &&
  				((info->rom[1] == 0x5 && info->rom[0] == 0x50) ||
  				(info->rom[1] == 0x7 && info->rom[0] == 0xFF))
  			) {
  				/* Invalid reading (scratchpad byte 6 = 0xC)
  				 * due to insufficient conversion time
  				 * or power failure.
  				 */
  				ret = -EIO;
  			}
  
  			goto dec_refcnt;
  		}
  
  	}
  
  mt_unlock:
  	mutex_unlock(&dev_master->bus_mutex);
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int conv_time_measure(struct w1_slave *sl, int *conv_time)
  {
  	struct therm_info inf,
  		*info = &inf;
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int ret = -ENODEV;
  	bool strong_pullup;
  
  	if (!sl->family_data)
  		goto error;
  
  	strong_pullup = (w1_strong_pullup == 2 ||
  		(!SLAVE_POWERMODE(sl) &&
  		w1_strong_pullup));
  
  	if (strong_pullup) {
  		pr_info("%s: Measure with strong_pullup is not supported.\n", __func__);
  		return -EINVAL;
  	}
  
  	memset(info->rom, 0, sizeof(info->rom));
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  		info->verdict = 0;
  		info->crc = 0;
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			int j_start, j_end;
  
  			/*no device need pullup */
  			w1_write_8(dev_master, W1_CONVERT_TEMP);
  
  			j_start = jiffies;
  			ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP);
  			if (ret) {
  				dev_dbg(&sl->dev, "%s: Timeout\n", __func__);
  				goto mt_unlock;
  			}
  			j_end = jiffies;
  			/* 1.2x increase for variation and changes over temperature range */
  			*conv_time = jiffies_to_msecs(j_end-j_start)*12/10;
  			pr_debug("W1 Measure complete, conv_time = %d, HZ=%d.\n",
  				*conv_time, HZ);
  			if (*conv_time <= CONV_TIME_MEASURE) {
  				ret = -EIO;
  				goto mt_unlock;
  			}
  			mutex_unlock(&dev_master->bus_mutex);
  			ret = read_scratchpad(sl, info);
  			goto dec_refcnt;
  		}
  
  	}
  mt_unlock:
  	mutex_unlock(&dev_master->bus_mutex);
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int read_scratchpad(struct w1_slave *sl, struct therm_info *info)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int ret = -ENODEV;
  
  	info->verdict = 0;
  
  	if (!sl->family_data)
  		goto error;
  
  	memset(info->rom, 0, sizeof(info->rom));
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			u8 nb_bytes_read;
  
  			w1_write_8(dev_master, W1_READ_SCRATCHPAD);
  
  			nb_bytes_read = w1_read_block(dev_master, info->rom, 9);
  			if (nb_bytes_read != 9) {
  				dev_warn(&sl->dev,
  					"w1_read_block(): returned %u instead of 9.\n",
  					nb_bytes_read);
  				ret = -EIO;
  			}
  
  			info->crc = w1_calc_crc8(info->rom, 8);
  
  			if (info->rom[8] == info->crc) {
  				info->verdict = 1;
  				ret = 0;
  			} else
  				ret = -EIO; /* CRC not checked */
  		}
  
  	}
  	mutex_unlock(&dev_master->bus_mutex);
  
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int ret = -ENODEV;
  
  	if (!sl->family_data)
  		goto error;
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			w1_write_8(dev_master, W1_WRITE_SCRATCHPAD);
  			w1_write_block(dev_master, data, nb_bytes);
  			ret = 0;
  		}
  	}
  	mutex_unlock(&dev_master->bus_mutex);
  
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int copy_scratchpad(struct w1_slave *sl)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int t_write, ret = -ENODEV;
  	bool strong_pullup;
  
  	if (!sl->family_data)
  		goto error;
  
  	t_write = W1_THERM_EEPROM_WRITE_DELAY;
  	strong_pullup = (w1_strong_pullup == 2 ||
  					(!SLAVE_POWERMODE(sl) &&
  					w1_strong_pullup));
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			unsigned long sleep_rem;
  
  			/* 10ms strong pullup (or delay) after the convert */
  			if (strong_pullup)
  				w1_next_pullup(dev_master, t_write);
  
  			w1_write_8(dev_master, W1_COPY_SCRATCHPAD);
  
  			if (strong_pullup) {
  				sleep_rem = msleep_interruptible(t_write);
  				if (sleep_rem != 0) {
  					ret = -EINTR;
  					goto mt_unlock;
  				}
  			}
  			ret = 0;
  		}
  
  	}
  
  mt_unlock:
  	mutex_unlock(&dev_master->bus_mutex);
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int recall_eeprom(struct w1_slave *sl)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int ret = -ENODEV;
  
  	if (!sl->family_data)
  		goto error;
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while (max_trying-- && ret) { /* ret should be 0 */
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  
  			w1_write_8(dev_master, W1_RECALL_EEPROM);
  			ret = w1_poll_completion(dev_master, W1_POLL_RECALL_EEPROM);
  		}
  
  	}
  
  	mutex_unlock(&dev_master->bus_mutex);
  
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int read_powermode(struct w1_slave *sl)
  {
  	struct w1_master *dev_master = sl->master;
  	int max_trying = W1_THERM_MAX_TRY;
  	int  ret = -ENODEV;
  
  	if (!sl->family_data)
  		goto error;
  
  	/* prevent the slave from going away in sleep */
  	atomic_inc(THERM_REFCNT(sl->family_data));
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto dec_refcnt;
  	}
  
  	while ((max_trying--) && (ret < 0)) {
  		/* safe version to select slave */
  		if (!reset_select_slave(sl)) {
  			w1_write_8(dev_master, W1_READ_PSUPPLY);
  			/*
  			 * Emit a read time slot and read only one bit,
  			 * 1 is externally powered,
  			 * 0 is parasite powered
  			 */
  			ret = w1_touch_bit(dev_master, 1);
  			/* ret should be either 1 either 0 */
  		}
  	}
  	mutex_unlock(&dev_master->bus_mutex);
  
  dec_refcnt:
  	atomic_dec(THERM_REFCNT(sl->family_data));
  error:
  	return ret;
  }
  
  static int trigger_bulk_read(struct w1_master *dev_master)
  {
  	struct w1_slave *sl = NULL; /* used to iterate through slaves */
  	int max_trying = W1_THERM_MAX_TRY;
  	int t_conv = 0;
  	int ret = -ENODEV;
  	bool strong_pullup = false;
  
  	/*
  	 * Check whether there are parasite powered device on the bus,
  	 * and compute duration of conversion for these devices
  	 * so we can apply a strong pullup if required
  	 */
  	list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {
  		if (!sl->family_data)
  			goto error;
  		if (bulk_read_support(sl)) {
  			int t_cur = conversion_time(sl);
  
  			t_conv = t_cur > t_conv ? t_cur : t_conv;
  			strong_pullup = strong_pullup ||
  					(w1_strong_pullup == 2 ||
  					(!SLAVE_POWERMODE(sl) &&
  					w1_strong_pullup));
  		}
  	}
  
  	/*
  	 * t_conv is the max conversion time required on the bus
  	 * If its 0, no device support the bulk read feature
  	 */
  	if (!t_conv)
  		goto error;
  
  	if (!bus_mutex_lock(&dev_master->bus_mutex)) {
  		ret = -EAGAIN;	/* Didn't acquire the mutex */
  		goto error;
  	}
  
  	while ((max_trying--) && (ret < 0)) { /* ret should be either 0 */
  
  		if (!w1_reset_bus(dev_master)) {	/* Just reset the bus */
  			unsigned long sleep_rem;
  
  			w1_write_8(dev_master, W1_SKIP_ROM);
  
  			if (strong_pullup)	/* Apply pullup if required */
  				w1_next_pullup(dev_master, t_conv);
  
  			w1_write_8(dev_master, W1_CONVERT_TEMP);
  
  			/* set a flag to instruct that converT pending */
  			list_for_each_entry(sl,
  				&dev_master->slist, w1_slave_entry) {
  				if (bulk_read_support(sl))
  					SLAVE_CONVERT_TRIGGERED(sl) = -1;
  			}
  
  			if (strong_pullup) { /* some device need pullup */
  				sleep_rem = msleep_interruptible(t_conv);
  				if (sleep_rem != 0) {
  					ret = -EINTR;
  					goto mt_unlock;
  				}
  				mutex_unlock(&dev_master->bus_mutex);
  			} else {
  				mutex_unlock(&dev_master->bus_mutex);
  				sleep_rem = msleep_interruptible(t_conv);
  				if (sleep_rem != 0) {
  					ret = -EINTR;
  					goto set_flag;
  				}
  			}
  			ret = 0;
  			goto set_flag;
  		}
  	}
  
  mt_unlock:
  	mutex_unlock(&dev_master->bus_mutex);
  set_flag:
  	/* set a flag to register convsersion is done */
  	list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {
  		if (bulk_read_support(sl))
  			SLAVE_CONVERT_TRIGGERED(sl) = 1;
  	}
  error:
  	return ret;
  }
  
  /* Sysfs Interface definition */
  
  static ssize_t w1_slave_show(struct device *device,
  			     struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	struct therm_info info;
  	u8 *family_data = sl->family_data;
  	int ret, i;
  	ssize_t c = PAGE_SIZE;
  
  	if (bulk_read_support(sl)) {
  		if (SLAVE_CONVERT_TRIGGERED(sl) < 0) {
  			dev_dbg(device,
  				"%s: Conversion in progress, retry later\n",
  				__func__);
  			return 0;
  		} else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) {
  			/* A bulk read has been issued, read the device RAM */
  			ret = read_scratchpad(sl, &info);
  			SLAVE_CONVERT_TRIGGERED(sl) = 0;
  		} else
  			ret = convert_t(sl, &info);
  	} else
  		ret = convert_t(sl, &info);
  
  	if (ret < 0) {
  		dev_dbg(device,
  			"%s: Temperature data may be corrupted. err=%d\n",
  			__func__, ret);
  		return 0;
  	}
  
  	for (i = 0; i < 9; ++i)
  		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]);
  	c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
  		      info.crc, (info.verdict) ? "YES" : "NO");
  
  	if (info.verdict)
  		memcpy(family_data, info.rom, sizeof(info.rom));
  	else
  		dev_warn(device, "%s:Read failed CRC check\n", __func__);
  
  	for (i = 0; i < 9; ++i)
  		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ",
  			      ((u8 *)family_data)[i]);
  
  	c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
  			temperature_from_RAM(sl, info.rom));
  
  	ret = PAGE_SIZE - c;
  	return ret;
  }
  
  static ssize_t w1_slave_store(struct device *device,
  			      struct device_attribute *attr, const char *buf,
  			      size_t size)
  {
  	int val, ret = 0;
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	ret = kstrtoint(buf, 10, &val); /* converting user entry to int */
  
  	if (ret) {	/* conversion error */
  		dev_info(device,
  			"%s: conversion error. err= %d\n", __func__, ret);
  		return size;	/* return size to avoid call back again */
  	}
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			"%s: Device not supported by the driver\n", __func__);
  		return size;  /* No device family */
  	}
  
  	if (val == 0)	/* val=0 : trigger a EEPROM save */
  		ret = copy_scratchpad(sl);
  	else {
  		if (SLAVE_SPECIFIC_FUNC(sl)->set_resolution)
  			ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val);
  	}
  
  	if (ret) {
  		dev_warn(device, "%s: Set resolution - error %d\n", __func__, ret);
  		/* Propagate error to userspace */
  		return ret;
  	}
  	SLAVE_RESOLUTION(sl) = val;
  	/* Reset the conversion time to default - it depends on resolution */
  	SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT;
  
  	return size; /* always return size to avoid infinite calling */
  }
  
  static ssize_t temperature_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	struct therm_info info;
  	int ret = 0;
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			"%s: Device not supported by the driver\n", __func__);
  		return 0;  /* No device family */
  	}
  
  	if (bulk_read_support(sl)) {
  		if (SLAVE_CONVERT_TRIGGERED(sl) < 0) {
  			dev_dbg(device,
  				"%s: Conversion in progress, retry later\n",
  				__func__);
  			return 0;
  		} else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) {
  			/* A bulk read has been issued, read the device RAM */
  			ret = read_scratchpad(sl, &info);
  			SLAVE_CONVERT_TRIGGERED(sl) = 0;
  		} else
  			ret = convert_t(sl, &info);
  	} else
  		ret = convert_t(sl, &info);
  
  	if (ret < 0) {
  		dev_dbg(device,
  			"%s: Temperature data may be corrupted. err=%d\n",
  			__func__, ret);
  		return 0;
  	}
  
  	return sprintf(buf, "%d\n", temperature_from_RAM(sl, info.rom));
  }
  
  static ssize_t ext_power_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	if (!sl->family_data) {
  		dev_info(device,
  			"%s: Device not supported by the driver\n", __func__);
  		return 0;  /* No device family */
  	}
  
  	/* Getting the power mode of the device {external, parasite} */
  	SLAVE_POWERMODE(sl) = read_powermode(sl);
  
  	if (SLAVE_POWERMODE(sl) < 0) {
  		dev_dbg(device,
  			"%s: Power_mode may be corrupted. err=%d\n",
  			__func__, SLAVE_POWERMODE(sl));
  	}
  	return sprintf(buf, "%d\n", SLAVE_POWERMODE(sl));
  }
  
  static ssize_t resolution_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			"%s: Device not supported by the driver\n", __func__);
  		return 0;  /* No device family */
  	}
  
  	/* get the correct function depending on the device */
  	SLAVE_RESOLUTION(sl) = SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl);
  	if (SLAVE_RESOLUTION(sl) < 0) {
  		dev_dbg(device,
  			"%s: Resolution may be corrupted. err=%d\n",
  			__func__, SLAVE_RESOLUTION(sl));
  	}
  
  	return sprintf(buf, "%d\n", SLAVE_RESOLUTION(sl));
  }
  
  static ssize_t resolution_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	int val;
  	int ret = 0;
  
  	ret = kstrtoint(buf, 10, &val); /* converting user entry to int */
  
  	if (ret) {	/* conversion error */
  		dev_info(device,
  			"%s: conversion error. err= %d\n", __func__, ret);
  		return size;	/* return size to avoid call back again */
  	}
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			"%s: Device not supported by the driver\n", __func__);
  		return size;  /* No device family */
  	}
  
  	/*
  	 * Don't deal with the val enterd by user,
  	 * only device knows what is correct or not
  	 */
  
  	/* get the correct function depending on the device */
  	ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val);
  
  	if (ret)
  		return ret;
  
  	SLAVE_RESOLUTION(sl) = val;
  	/* Reset the conversion time to default because it depends on resolution */
  	SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT;
  
  	return size;
  }
  
  static ssize_t eeprom_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	int ret = -EINVAL; /* Invalid argument */
  
  	if (size == sizeof(EEPROM_CMD_WRITE)) {
  		if (!strncmp(buf, EEPROM_CMD_WRITE, sizeof(EEPROM_CMD_WRITE)-1))
  			ret = copy_scratchpad(sl);
  	} else if (size == sizeof(EEPROM_CMD_READ)) {
  		if (!strncmp(buf, EEPROM_CMD_READ, sizeof(EEPROM_CMD_READ)-1))
  			ret = recall_eeprom(sl);
  	}
  
  	if (ret)
  		dev_info(device, "%s: error in process %d\n", __func__, ret);
  
  	return size;
  }
  
  static ssize_t alarms_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	int ret;
  	s8 th = 0, tl = 0;
  	struct therm_info scratchpad;
  
  	ret = read_scratchpad(sl, &scratchpad);
  
  	if (!ret)	{
  		th = scratchpad.rom[2]; /* TH is byte 2 */
  		tl = scratchpad.rom[3]; /* TL is byte 3 */
  	} else {
  		dev_info(device,
  			"%s: error reading alarms register %d\n",
  			__func__, ret);
  	}
  
  	return sprintf(buf, "%hd %hd\n", tl, th);
  }
  
  static ssize_t alarms_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	struct therm_info info;
  	u8 new_config_register[3];	/* array of data to be written */
  	int temp, ret;
  	char *token = NULL;
  	s8 tl, th, tt;	/* 1 byte per value + temp ring order */
  	char *p_args, *orig;
  
  	p_args = orig = kmalloc(size, GFP_KERNEL);
  	/* Safe string copys as buf is const */
  	if (!p_args) {
  		dev_warn(device,
  			"%s: error unable to allocate memory %d\n",
  			__func__, -ENOMEM);
  		return size;
  	}
  	strcpy(p_args, buf);
  
  	/* Split string using space char */
  	token = strsep(&p_args, " ");
  
  	if (!token)	{
  		dev_info(device,
  			"%s: error parsing args %d\n", __func__, -EINVAL);
  		goto free_m;
  	}
  
  	/* Convert 1st entry to int */
  	ret = kstrtoint (token, 10, &temp);
  	if (ret) {
  		dev_info(device,
  			"%s: error parsing args %d\n", __func__, ret);
  		goto free_m;
  	}
  
  	tl = int_to_short(temp);
  
  	/* Split string using space char */
  	token = strsep(&p_args, " ");
  	if (!token)	{
  		dev_info(device,
  			"%s: error parsing args %d\n", __func__, -EINVAL);
  		goto free_m;
  	}
  	/* Convert 2nd entry to int */
  	ret = kstrtoint (token, 10, &temp);
  	if (ret) {
  		dev_info(device,
  			"%s: error parsing args %d\n", __func__, ret);
  		goto free_m;
  	}
  
  	/* Prepare to cast to short by eliminating out of range values */
  	th = int_to_short(temp);
  
  	/* Reorder if required th and tl */
  	if (tl > th) {
  		tt = tl; tl = th; th = tt;
  	}
  
  	/*
  	 * Read the scratchpad to change only the required bits
  	 * (th : byte 2 - tl: byte 3)
  	 */
  	ret = read_scratchpad(sl, &info);
  	if (!ret) {
  		new_config_register[0] = th;	/* Byte 2 */
  		new_config_register[1] = tl;	/* Byte 3 */
  		new_config_register[2] = info.rom[4];/* Byte 4 */
  	} else {
  		dev_info(device,
  			"%s: error reading from the slave device %d\n",
  			__func__, ret);
  		goto free_m;
  	}
  
  	/* Write data in the device RAM */
  	if (!SLAVE_SPECIFIC_FUNC(sl)) {
  		dev_info(device,
  			"%s: Device not supported by the driver %d\n",
  			__func__, -ENODEV);
  		goto free_m;
  	}
  
  	ret = SLAVE_SPECIFIC_FUNC(sl)->write_data(sl, new_config_register);
  	if (ret)
  		dev_info(device,
  			"%s: error writing to the slave device %d\n",
  			__func__, ret);
  
  free_m:
  	/* free allocated memory */
  	kfree(orig);
  
  	return size;
  }
  
  static ssize_t therm_bulk_read_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size)
  {
  	struct w1_master *dev_master = dev_to_w1_master(device);
  	int ret = -EINVAL; /* Invalid argument */
  
  	if (size == sizeof(BULK_TRIGGER_CMD))
  		if (!strncmp(buf, BULK_TRIGGER_CMD,
  				sizeof(BULK_TRIGGER_CMD)-1))
  			ret = trigger_bulk_read(dev_master);
  
  	if (ret)
  		dev_info(device,
  			"%s: unable to trigger a bulk read on the bus. err=%d\n",
  			__func__, ret);
  
  	return size;
  }
  
  static ssize_t therm_bulk_read_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_master *dev_master = dev_to_w1_master(device);
  	struct w1_slave *sl = NULL;
  	int ret = 0;
  
  	list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {
  		if (sl->family_data) {
  			if (bulk_read_support(sl)) {
  				if (SLAVE_CONVERT_TRIGGERED(sl) == -1) {
  					ret = -1;
  					goto show_result;
  				}
  				if (SLAVE_CONVERT_TRIGGERED(sl) == 1)
  					/* continue to check other slaves */
  					ret = 1;
  			}
  		}
  	}
  show_result:
  	return sprintf(buf, "%d\n", ret);
  }
  
  static ssize_t conv_time_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			"%s: Device is not supported by the driver\n", __func__);
  		return 0;  /* No device family */
  	}
  	return sprintf(buf, "%d\n", conversion_time(sl));
  }
  
  static ssize_t conv_time_store(struct device *device,
  	struct device_attribute *attr, const char *buf, size_t size)
  {
  	int val, ret = 0;
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	if (kstrtoint(buf, 10, &val)) /* converting user entry to int */
  		return -EINVAL;
  
  	if (check_family_data(sl))
  		return -ENODEV;
  
  	if (val != CONV_TIME_MEASURE) {
  		if (val >= CONV_TIME_DEFAULT)
  			SLAVE_CONV_TIME_OVERRIDE(sl) = val;
  		else
  			return -EINVAL;
  
  	} else {
  		int conv_time;
  
  		ret = conv_time_measure(sl, &conv_time);
  		if (ret)
  			return -EIO;
  		SLAVE_CONV_TIME_OVERRIDE(sl) = conv_time;
  	}
  	return size;
  }
  
  static ssize_t features_show(struct device *device,
  			     struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device,
  			 "%s: Device not supported by the driver\n", __func__);
  		return 0;  /* No device family */
  	}
  	return sprintf(buf, "%u\n", SLAVE_FEATURES(sl));
  }
  
  static ssize_t features_store(struct device *device,
  			      struct device_attribute *attr, const char *buf, size_t size)
  {
  	int val, ret = 0;
  	bool strong_pullup;
  	struct w1_slave *sl = dev_to_w1_slave(device);
  
  	ret = kstrtouint(buf, 10, &val); /* converting user entry to int */
  	if (ret)
  		return -EINVAL;  /* invalid number */
  
  	if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {
  		dev_info(device, "%s: Device not supported by the driver\n", __func__);
  		return -ENODEV;
  	}
  
  	if ((val & W1_THERM_FEATURES_MASK) != val)
  		return -EINVAL;
  
  	SLAVE_FEATURES(sl) = val;
  
  	strong_pullup = (w1_strong_pullup == 2 ||
  			 (!SLAVE_POWERMODE(sl) &&
  			  w1_strong_pullup));
  
  	if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {
  		dev_warn(&sl->dev,
  			 "%s: W1_THERM_POLL_COMPLETION disabled in parasite power mode.\n",
  			 __func__);
  		SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION;
  	}
  
  	return size;
  }
  
  #if IS_REACHABLE(CONFIG_HWMON)
  static int w1_read_temp(struct device *device, u32 attr, int channel,
  			long *val)
  {
  	struct w1_slave *sl = dev_get_drvdata(device);
  	struct therm_info info;
  	int ret;
  
  	switch (attr) {
  	case hwmon_temp_input:
  		ret = convert_t(sl, &info);
  		if (ret)
  			return ret;
  
  		if (!info.verdict) {
  			ret = -EIO;
  			return ret;
  		}
  
  		*val = temperature_from_RAM(sl, info.rom);
  		ret = 0;
  		break;
  	default:
  		ret = -EOPNOTSUPP;
  		break;
  	}
  
  	return ret;
  }
  #endif
  
  #define W1_42_CHAIN	0x99
  #define W1_42_CHAIN_OFF	0x3C
  #define W1_42_CHAIN_OFF_INV	0xC3
  #define W1_42_CHAIN_ON	0x5A
  #define W1_42_CHAIN_ON_INV	0xA5
  #define W1_42_CHAIN_DONE 0x96
  #define W1_42_CHAIN_DONE_INV 0x69
  #define W1_42_COND_READ	0x0F
  #define W1_42_SUCCESS_CONFIRM_BYTE 0xAA
  #define W1_42_FINISHED_BYTE 0xFF
  static ssize_t w1_seq_show(struct device *device,
  	struct device_attribute *attr, char *buf)
  {
  	struct w1_slave *sl = dev_to_w1_slave(device);
  	ssize_t c = PAGE_SIZE;
  	int rv;
  	int i;
  	u8 ack;
  	u64 rn;
  	struct w1_reg_num *reg_num;
  	int seq = 0;
  
  	mutex_lock(&sl->master->bus_mutex);
  	/* Place all devices in CHAIN state */
  	if (w1_reset_bus(sl->master))
  		goto error;
  	w1_write_8(sl->master, W1_SKIP_ROM);
  	w1_write_8(sl->master, W1_42_CHAIN);
  	w1_write_8(sl->master, W1_42_CHAIN_ON);
  	w1_write_8(sl->master, W1_42_CHAIN_ON_INV);
  	msleep(sl->master->pullup_duration);
  
  	/* check for acknowledgment */
  	ack = w1_read_8(sl->master);
  	if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
  		goto error;
  
  	/* In case the bus fails to send 0xFF, limit */
  	for (i = 0; i <= 64; i++) {
  		if (w1_reset_bus(sl->master))
  			goto error;
  
  		w1_write_8(sl->master, W1_42_COND_READ);
  		rv = w1_read_block(sl->master, (u8 *)&rn, 8);
  		reg_num = (struct w1_reg_num *) &rn;
  		if (reg_num->family == W1_42_FINISHED_BYTE)
  			break;
  		if (sl->reg_num.id == reg_num->id)
  			seq = i;
  
  		w1_write_8(sl->master, W1_42_CHAIN);
  		w1_write_8(sl->master, W1_42_CHAIN_DONE);
  		w1_write_8(sl->master, W1_42_CHAIN_DONE_INV);
  		w1_read_block(sl->master, &ack, sizeof(ack));
  
  		/* check for acknowledgment */
  		ack = w1_read_8(sl->master);
  		if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
  			goto error;
  
  	}
  
  	/* Exit from CHAIN state */
  	if (w1_reset_bus(sl->master))
  		goto error;
  	w1_write_8(sl->master, W1_SKIP_ROM);
  	w1_write_8(sl->master, W1_42_CHAIN);
  	w1_write_8(sl->master, W1_42_CHAIN_OFF);
  	w1_write_8(sl->master, W1_42_CHAIN_OFF_INV);
  
  	/* check for acknowledgment */
  	ack = w1_read_8(sl->master);
  	if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
  		goto error;
  	mutex_unlock(&sl->master->bus_mutex);
  
  	c -= snprintf(buf + PAGE_SIZE - c, c, "%d\n", seq);
  	return PAGE_SIZE - c;
  error:
  	mutex_unlock(&sl->master->bus_mutex);
  	return -EIO;
  }
  
  static int __init w1_therm_init(void)
  {
  	int err, i;
  
  	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
  		err = w1_register_family(w1_therm_families[i].f);
  		if (err)
  			w1_therm_families[i].broken = 1;
  	}
  
  	return 0;
  }
  
  static void __exit w1_therm_fini(void)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
  		if (!w1_therm_families[i].broken)
  			w1_unregister_family(w1_therm_families[i].f);
  }
  
  module_init(w1_therm_init);
  module_exit(w1_therm_fini);
  
  MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
  MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20));
  MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822));
  MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20));
  MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825));
  MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00));
  