// SPDX-License-Identifier: GPL-2.0-only

  /*

   * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   *
   * This file defines the sysfs class "hwmon", for use by sensors drivers.
   *
   * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>

   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/bitops.h>

  #include <linux/device.h>
  #include <linux/err.h>

  #include <linux/gfp.h>

  #include <linux/hwmon.h>
  #include <linux/idr.h>

  #include <linux/list.h>

  #include <linux/module.h>

  #include <linux/pci.h>

  #include <linux/slab.h>

  #include <linux/string.h>

  #include <linux/thermal.h>

  #define CREATE_TRACE_POINTS
  #include <trace/events/hwmon.h>

  #define HWMON_ID_PREFIX "hwmon"
  #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"

  struct hwmon_device {
  	const char *name;
  	struct device dev;

  	const struct hwmon_chip_info *chip;

  	struct list_head tzdata;

  	struct attribute_group group;
  	const struct attribute_group **groups;

  };

  #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)

  #define MAX_SYSFS_ATTR_NAME_LENGTH	32

  struct hwmon_device_attribute {
  	struct device_attribute dev_attr;
  	const struct hwmon_ops *ops;
  	enum hwmon_sensor_types type;
  	u32 attr;
  	int index;

  	char name[MAX_SYSFS_ATTR_NAME_LENGTH];

  };
  
  #define to_hwmon_attr(d) \
  	container_of(d, struct hwmon_device_attribute, dev_attr)

  #define to_dev_attr(a) container_of(a, struct device_attribute, attr)

  
  /*
   * Thermal zone information

   */
  struct hwmon_thermal_data {

  	struct list_head node;		/* hwmon tzdata list entry */

  	struct device *dev;		/* Reference to hwmon device */

  	int index;			/* sensor index */

  	struct thermal_zone_device *tzd;/* thermal zone device */

  };

  static ssize_t

  name_show(struct device *dev, struct device_attribute *attr, char *buf)

  {
  	return sprintf(buf, "%s
  ", to_hwmon_device(dev)->name);
  }

  static DEVICE_ATTR_RO(name);

  
  static struct attribute *hwmon_dev_attrs[] = {
  	&dev_attr_name.attr,
  	NULL
  };
  
  static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  					 struct attribute *attr, int n)
  {
  	struct device *dev = container_of(kobj, struct device, kobj);
  
  	if (to_hwmon_device(dev)->name == NULL)
  		return 0;
  
  	return attr->mode;
  }

  static const struct attribute_group hwmon_dev_attr_group = {

  	.attrs		= hwmon_dev_attrs,
  	.is_visible	= hwmon_dev_name_is_visible,
  };
  
  static const struct attribute_group *hwmon_dev_attr_groups[] = {
  	&hwmon_dev_attr_group,
  	NULL
  };

  static void hwmon_free_attrs(struct attribute **attrs)
  {
  	int i;
  
  	for (i = 0; attrs[i]; i++) {
  		struct device_attribute *dattr = to_dev_attr(attrs[i]);
  		struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
  
  		kfree(hattr);
  	}
  	kfree(attrs);
  }

  static void hwmon_dev_release(struct device *dev)
  {

  	struct hwmon_device *hwdev = to_hwmon_device(dev);
  
  	if (hwdev->group.attrs)
  		hwmon_free_attrs(hwdev->group.attrs);
  	kfree(hwdev->groups);
  	kfree(hwdev);

  }
  
  static struct class hwmon_class = {
  	.name = "hwmon",
  	.owner = THIS_MODULE,
  	.dev_groups = hwmon_dev_attr_groups,
  	.dev_release = hwmon_dev_release,
  };

  static DEFINE_IDA(hwmon_ida);

  /* Thermal zone handling */

  /*
   * The complex conditional is necessary to avoid a cyclic dependency
   * between hwmon and thermal_sys modules.
   */

  #ifdef CONFIG_THERMAL_OF

  static int hwmon_thermal_get_temp(void *data, int *temp)
  {
  	struct hwmon_thermal_data *tdata = data;

  	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);

  	int ret;
  	long t;

  	ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,

  				     tdata->index, &t);
  	if (ret < 0)
  		return ret;
  
  	*temp = t;
  
  	return 0;
  }

  static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {

  	.get_temp = hwmon_thermal_get_temp,
  };

  static void hwmon_thermal_remove_sensor(void *data)
  {
  	list_del(data);
  }

  static int hwmon_thermal_add_sensor(struct device *dev, int index)

  {

  	struct hwmon_device *hwdev = to_hwmon_device(dev);

  	struct hwmon_thermal_data *tdata;

  	struct thermal_zone_device *tzd;

  	int err;

  
  	tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
  	if (!tdata)
  		return -ENOMEM;

  	tdata->dev = dev;

  	tdata->index = index;

  	tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,

  						   &hwmon_thermal_ops);
  	/*
  	 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
  	 * so ignore that error but forward any other error.
  	 */
  	if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
  		return PTR_ERR(tzd);

  	err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
  	if (err)
  		return err;
  
  	tdata->tzd = tzd;
  	list_add(&tdata->node, &hwdev->tzdata);

  	return 0;
  }

  
  static int hwmon_thermal_register_sensors(struct device *dev)
  {
  	struct hwmon_device *hwdev = to_hwmon_device(dev);
  	const struct hwmon_chip_info *chip = hwdev->chip;
  	const struct hwmon_channel_info **info = chip->info;
  	void *drvdata = dev_get_drvdata(dev);
  	int i;
  
  	for (i = 1; info[i]; i++) {
  		int j;
  
  		if (info[i]->type != hwmon_temp)
  			continue;
  
  		for (j = 0; info[i]->config[j]; j++) {
  			int err;
  
  			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
  			    !chip->ops->is_visible(drvdata, hwmon_temp,
  						   hwmon_temp_input, j))
  				continue;
  
  			err = hwmon_thermal_add_sensor(dev, j);
  			if (err)
  				return err;
  		}
  	}
  
  	return 0;
  }

  static void hwmon_thermal_notify(struct device *dev, int index)
  {
  	struct hwmon_device *hwdev = to_hwmon_device(dev);
  	struct hwmon_thermal_data *tzdata;
  
  	list_for_each_entry(tzdata, &hwdev->tzdata, node) {
  		if (tzdata->index == index) {
  			thermal_zone_device_update(tzdata->tzd,
  						   THERMAL_EVENT_UNSPECIFIED);
  		}
  	}
  }

  #else

  static int hwmon_thermal_register_sensors(struct device *dev)

  {
  	return 0;
  }

  
  static void hwmon_thermal_notify(struct device *dev, int index) { }

  #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */

  static int hwmon_attr_base(enum hwmon_sensor_types type)
  {

  	if (type == hwmon_in || type == hwmon_intrusion)

  		return 0;
  	return 1;
  }

  /* sysfs attribute management */
  
  static ssize_t hwmon_attr_show(struct device *dev,
  			       struct device_attribute *devattr, char *buf)
  {
  	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
  	long val;
  	int ret;
  
  	ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
  			       &val);
  	if (ret < 0)
  		return ret;

  	trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
  			      hattr->name, val);

  	return sprintf(buf, "%ld
  ", val);
  }

  static ssize_t hwmon_attr_show_string(struct device *dev,
  				      struct device_attribute *devattr,
  				      char *buf)
  {
  	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);

  	enum hwmon_sensor_types type = hattr->type;

  	const char *s;

  	int ret;
  
  	ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
  				      hattr->index, &s);
  	if (ret < 0)
  		return ret;

  	trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
  				     hattr->name, s);

  	return sprintf(buf, "%s
  ", s);
  }

  static ssize_t hwmon_attr_store(struct device *dev,
  				struct device_attribute *devattr,
  				const char *buf, size_t count)
  {
  	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
  	long val;
  	int ret;
  
  	ret = kstrtol(buf, 10, &val);
  	if (ret < 0)
  		return ret;
  
  	ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
  				val);
  	if (ret < 0)
  		return ret;

  	trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
  			       hattr->name, val);

  	return count;

  }

  static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
  {
  	return (type == hwmon_temp && attr == hwmon_temp_label) ||
  	       (type == hwmon_in && attr == hwmon_in_label) ||
  	       (type == hwmon_curr && attr == hwmon_curr_label) ||
  	       (type == hwmon_power && attr == hwmon_power_label) ||
  	       (type == hwmon_energy && attr == hwmon_energy_label) ||
  	       (type == hwmon_humidity && attr == hwmon_humidity_label) ||
  	       (type == hwmon_fan && attr == hwmon_fan_label);
  }

  static struct attribute *hwmon_genattr(const void *drvdata,

  				       enum hwmon_sensor_types type,
  				       u32 attr,
  				       int index,
  				       const char *template,
  				       const struct hwmon_ops *ops)
  {
  	struct hwmon_device_attribute *hattr;
  	struct device_attribute *dattr;
  	struct attribute *a;
  	umode_t mode;

  	const char *name;

  	bool is_string = is_string_attr(type, attr);

  
  	/* The attribute is invisible if there is no template string */
  	if (!template)
  		return ERR_PTR(-ENOENT);
  
  	mode = ops->is_visible(drvdata, type, attr, index);
  	if (!mode)
  		return ERR_PTR(-ENOENT);

  	if ((mode & 0444) && ((is_string && !ops->read_string) ||

  				 (!is_string && !ops->read)))

  		return ERR_PTR(-EINVAL);

  	if ((mode & 0222) && !ops->write)

  		return ERR_PTR(-EINVAL);

  	hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);

  	if (!hattr)
  		return ERR_PTR(-ENOMEM);

  	if (type == hwmon_chip) {

  		name = template;

  	} else {

  		scnprintf(hattr->name, sizeof(hattr->name), template,

  			  index + hwmon_attr_base(type));

  		name = hattr->name;

  	}

  	hattr->type = type;
  	hattr->attr = attr;
  	hattr->index = index;
  	hattr->ops = ops;
  
  	dattr = &hattr->dev_attr;

  	dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;

  	dattr->store = hwmon_attr_store;
  
  	a = &dattr->attr;
  	sysfs_attr_init(a);
  	a->name = name;
  	a->mode = mode;
  
  	return a;
  }

  /*
   * Chip attributes are not attribute templates but actual sysfs attributes.
   * See hwmon_genattr() for special handling.
   */
  static const char * const hwmon_chip_attrs[] = {

  	[hwmon_chip_temp_reset_history] = "temp_reset_history",

  	[hwmon_chip_in_reset_history] = "in_reset_history",

  	[hwmon_chip_curr_reset_history] = "curr_reset_history",

  	[hwmon_chip_power_reset_history] = "power_reset_history",

  	[hwmon_chip_update_interval] = "update_interval",
  	[hwmon_chip_alarms] = "alarms",

  	[hwmon_chip_samples] = "samples",
  	[hwmon_chip_curr_samples] = "curr_samples",
  	[hwmon_chip_in_samples] = "in_samples",
  	[hwmon_chip_power_samples] = "power_samples",
  	[hwmon_chip_temp_samples] = "temp_samples",

  };
  
  static const char * const hwmon_temp_attr_templates[] = {

  	[hwmon_temp_enable] = "temp%d_enable",

  	[hwmon_temp_input] = "temp%d_input",
  	[hwmon_temp_type] = "temp%d_type",
  	[hwmon_temp_lcrit] = "temp%d_lcrit",
  	[hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
  	[hwmon_temp_min] = "temp%d_min",
  	[hwmon_temp_min_hyst] = "temp%d_min_hyst",
  	[hwmon_temp_max] = "temp%d_max",
  	[hwmon_temp_max_hyst] = "temp%d_max_hyst",
  	[hwmon_temp_crit] = "temp%d_crit",
  	[hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
  	[hwmon_temp_emergency] = "temp%d_emergency",
  	[hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
  	[hwmon_temp_alarm] = "temp%d_alarm",
  	[hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
  	[hwmon_temp_min_alarm] = "temp%d_min_alarm",
  	[hwmon_temp_max_alarm] = "temp%d_max_alarm",
  	[hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
  	[hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
  	[hwmon_temp_fault] = "temp%d_fault",
  	[hwmon_temp_offset] = "temp%d_offset",
  	[hwmon_temp_label] = "temp%d_label",
  	[hwmon_temp_lowest] = "temp%d_lowest",
  	[hwmon_temp_highest] = "temp%d_highest",
  	[hwmon_temp_reset_history] = "temp%d_reset_history",

  	[hwmon_temp_rated_min] = "temp%d_rated_min",
  	[hwmon_temp_rated_max] = "temp%d_rated_max",

  };

  static const char * const hwmon_in_attr_templates[] = {

  	[hwmon_in_enable] = "in%d_enable",

  	[hwmon_in_input] = "in%d_input",
  	[hwmon_in_min] = "in%d_min",
  	[hwmon_in_max] = "in%d_max",
  	[hwmon_in_lcrit] = "in%d_lcrit",
  	[hwmon_in_crit] = "in%d_crit",
  	[hwmon_in_average] = "in%d_average",
  	[hwmon_in_lowest] = "in%d_lowest",
  	[hwmon_in_highest] = "in%d_highest",
  	[hwmon_in_reset_history] = "in%d_reset_history",
  	[hwmon_in_label] = "in%d_label",
  	[hwmon_in_alarm] = "in%d_alarm",
  	[hwmon_in_min_alarm] = "in%d_min_alarm",
  	[hwmon_in_max_alarm] = "in%d_max_alarm",
  	[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
  	[hwmon_in_crit_alarm] = "in%d_crit_alarm",

  	[hwmon_in_rated_min] = "in%d_rated_min",
  	[hwmon_in_rated_max] = "in%d_rated_max",

  };

  static const char * const hwmon_curr_attr_templates[] = {

  	[hwmon_curr_enable] = "curr%d_enable",

  	[hwmon_curr_input] = "curr%d_input",
  	[hwmon_curr_min] = "curr%d_min",
  	[hwmon_curr_max] = "curr%d_max",
  	[hwmon_curr_lcrit] = "curr%d_lcrit",
  	[hwmon_curr_crit] = "curr%d_crit",
  	[hwmon_curr_average] = "curr%d_average",
  	[hwmon_curr_lowest] = "curr%d_lowest",
  	[hwmon_curr_highest] = "curr%d_highest",
  	[hwmon_curr_reset_history] = "curr%d_reset_history",
  	[hwmon_curr_label] = "curr%d_label",
  	[hwmon_curr_alarm] = "curr%d_alarm",
  	[hwmon_curr_min_alarm] = "curr%d_min_alarm",
  	[hwmon_curr_max_alarm] = "curr%d_max_alarm",
  	[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
  	[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",

  	[hwmon_curr_rated_min] = "curr%d_rated_min",
  	[hwmon_curr_rated_max] = "curr%d_rated_max",

  };

  static const char * const hwmon_power_attr_templates[] = {

  	[hwmon_power_enable] = "power%d_enable",

  	[hwmon_power_average] = "power%d_average",
  	[hwmon_power_average_interval] = "power%d_average_interval",
  	[hwmon_power_average_interval_max] = "power%d_interval_max",
  	[hwmon_power_average_interval_min] = "power%d_interval_min",
  	[hwmon_power_average_highest] = "power%d_average_highest",
  	[hwmon_power_average_lowest] = "power%d_average_lowest",
  	[hwmon_power_average_max] = "power%d_average_max",
  	[hwmon_power_average_min] = "power%d_average_min",
  	[hwmon_power_input] = "power%d_input",
  	[hwmon_power_input_highest] = "power%d_input_highest",
  	[hwmon_power_input_lowest] = "power%d_input_lowest",
  	[hwmon_power_reset_history] = "power%d_reset_history",
  	[hwmon_power_accuracy] = "power%d_accuracy",
  	[hwmon_power_cap] = "power%d_cap",
  	[hwmon_power_cap_hyst] = "power%d_cap_hyst",
  	[hwmon_power_cap_max] = "power%d_cap_max",
  	[hwmon_power_cap_min] = "power%d_cap_min",

  	[hwmon_power_min] = "power%d_min",

  	[hwmon_power_max] = "power%d_max",

  	[hwmon_power_lcrit] = "power%d_lcrit",

  	[hwmon_power_crit] = "power%d_crit",
  	[hwmon_power_label] = "power%d_label",
  	[hwmon_power_alarm] = "power%d_alarm",
  	[hwmon_power_cap_alarm] = "power%d_cap_alarm",

  	[hwmon_power_min_alarm] = "power%d_min_alarm",

  	[hwmon_power_max_alarm] = "power%d_max_alarm",

  	[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",

  	[hwmon_power_crit_alarm] = "power%d_crit_alarm",

  	[hwmon_power_rated_min] = "power%d_rated_min",
  	[hwmon_power_rated_max] = "power%d_rated_max",

  };

  static const char * const hwmon_energy_attr_templates[] = {

  	[hwmon_energy_enable] = "energy%d_enable",

  	[hwmon_energy_input] = "energy%d_input",
  	[hwmon_energy_label] = "energy%d_label",
  };
  
  static const char * const hwmon_humidity_attr_templates[] = {

  	[hwmon_humidity_enable] = "humidity%d_enable",

  	[hwmon_humidity_input] = "humidity%d_input",
  	[hwmon_humidity_label] = "humidity%d_label",
  	[hwmon_humidity_min] = "humidity%d_min",
  	[hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
  	[hwmon_humidity_max] = "humidity%d_max",
  	[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
  	[hwmon_humidity_alarm] = "humidity%d_alarm",
  	[hwmon_humidity_fault] = "humidity%d_fault",

  	[hwmon_humidity_rated_min] = "humidity%d_rated_min",
  	[hwmon_humidity_rated_max] = "humidity%d_rated_max",

  };

  static const char * const hwmon_fan_attr_templates[] = {

  	[hwmon_fan_enable] = "fan%d_enable",

  	[hwmon_fan_input] = "fan%d_input",
  	[hwmon_fan_label] = "fan%d_label",
  	[hwmon_fan_min] = "fan%d_min",
  	[hwmon_fan_max] = "fan%d_max",
  	[hwmon_fan_div] = "fan%d_div",
  	[hwmon_fan_pulses] = "fan%d_pulses",
  	[hwmon_fan_target] = "fan%d_target",
  	[hwmon_fan_alarm] = "fan%d_alarm",
  	[hwmon_fan_min_alarm] = "fan%d_min_alarm",
  	[hwmon_fan_max_alarm] = "fan%d_max_alarm",
  	[hwmon_fan_fault] = "fan%d_fault",
  };

  static const char * const hwmon_pwm_attr_templates[] = {
  	[hwmon_pwm_input] = "pwm%d",
  	[hwmon_pwm_enable] = "pwm%d_enable",
  	[hwmon_pwm_mode] = "pwm%d_mode",
  	[hwmon_pwm_freq] = "pwm%d_freq",
  };

  static const char * const hwmon_intrusion_attr_templates[] = {
  	[hwmon_intrusion_alarm] = "intrusion%d_alarm",
  	[hwmon_intrusion_beep]  = "intrusion%d_beep",
  };

  static const char * const *__templates[] = {

  	[hwmon_chip] = hwmon_chip_attrs,

  	[hwmon_temp] = hwmon_temp_attr_templates,

  	[hwmon_in] = hwmon_in_attr_templates,

  	[hwmon_curr] = hwmon_curr_attr_templates,

  	[hwmon_power] = hwmon_power_attr_templates,

  	[hwmon_energy] = hwmon_energy_attr_templates,
  	[hwmon_humidity] = hwmon_humidity_attr_templates,

  	[hwmon_fan] = hwmon_fan_attr_templates,

  	[hwmon_pwm] = hwmon_pwm_attr_templates,

  	[hwmon_intrusion] = hwmon_intrusion_attr_templates,

  };
  
  static const int __templates_size[] = {

  	[hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),

  	[hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),

  	[hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),

  	[hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),

  	[hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),

  	[hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
  	[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),

  	[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),

  	[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),

  	[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),

  };

  int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
  		       u32 attr, int channel)
  {
  	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
  	const char * const *templates;
  	const char *template;
  	int base;
  
  	if (type >= ARRAY_SIZE(__templates))
  		return -EINVAL;
  	if (attr >= __templates_size[type])
  		return -EINVAL;
  
  	templates = __templates[type];
  	template = templates[attr];
  
  	base = hwmon_attr_base(type);
  
  	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
  	sysfs_notify(&dev->kobj, NULL, sattr);
  	kobject_uevent(&dev->kobj, KOBJ_CHANGE);
  
  	if (type == hwmon_temp)
  		hwmon_thermal_notify(dev, channel);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(hwmon_notify_event);

  static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
  {
  	int i, n;
  
  	for (i = n = 0; info->config[i]; i++)
  		n += hweight32(info->config[i]);
  
  	return n;
  }

  static int hwmon_genattrs(const void *drvdata,

  			  struct attribute **attrs,
  			  const struct hwmon_ops *ops,
  			  const struct hwmon_channel_info *info)
  {
  	const char * const *templates;
  	int template_size;
  	int i, aindex = 0;
  
  	if (info->type >= ARRAY_SIZE(__templates))
  		return -EINVAL;
  
  	templates = __templates[info->type];
  	template_size = __templates_size[info->type];
  
  	for (i = 0; info->config[i]; i++) {
  		u32 attr_mask = info->config[i];
  		u32 attr;
  
  		while (attr_mask) {
  			struct attribute *a;
  
  			attr = __ffs(attr_mask);
  			attr_mask &= ~BIT(attr);
  			if (attr >= template_size)
  				return -EINVAL;

  			a = hwmon_genattr(drvdata, info->type, attr, i,

  					  templates[attr], ops);
  			if (IS_ERR(a)) {
  				if (PTR_ERR(a) != -ENOENT)
  					return PTR_ERR(a);
  				continue;
  			}
  			attrs[aindex++] = a;
  		}
  	}
  	return aindex;
  }
  
  static struct attribute **

  __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)

  {
  	int ret, i, aindex = 0, nattrs = 0;
  	struct attribute **attrs;
  
  	for (i = 0; chip->info[i]; i++)
  		nattrs += hwmon_num_channel_attrs(chip->info[i]);
  
  	if (nattrs == 0)
  		return ERR_PTR(-EINVAL);

  	attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);

  	if (!attrs)
  		return ERR_PTR(-ENOMEM);
  
  	for (i = 0; chip->info[i]; i++) {

  		ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,

  				     chip->info[i]);

  		if (ret < 0) {
  			hwmon_free_attrs(attrs);

  			return ERR_PTR(ret);

  		}

  		aindex += ret;
  	}
  
  	return attrs;
  }
  
  static struct device *
  __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
  			const struct hwmon_chip_info *chip,
  			const struct attribute_group **groups)

  {

  	struct hwmon_device *hwdev;

  	struct device *hdev;

  	int i, err, id;

  	/* Complain about invalid characters in hwmon name attribute */

  	if (name && (!strlen(name) || strpbrk(name, "-* \t
  ")))

  		dev_warn(dev,
  			 "hwmon: '%s' is not a valid name attribute, please fix
  ",
  			 name);

  	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
  	if (id < 0)
  		return ERR_PTR(id);

  	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
  	if (hwdev == NULL) {
  		err = -ENOMEM;
  		goto ida_remove;
  	}

  	hdev = &hwdev->dev;

  	if (chip) {

  		struct attribute **attrs;

  		int ngroups = 2; /* terminating NULL plus &hwdev->groups */

  
  		if (groups)
  			for (i = 0; groups[i]; i++)
  				ngroups++;

  		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);

  		if (!hwdev->groups) {
  			err = -ENOMEM;
  			goto free_hwmon;
  		}

  		attrs = __hwmon_create_attrs(drvdata, chip);

  		if (IS_ERR(attrs)) {
  			err = PTR_ERR(attrs);
  			goto free_hwmon;
  		}
  
  		hwdev->group.attrs = attrs;
  		ngroups = 0;
  		hwdev->groups[ngroups++] = &hwdev->group;
  
  		if (groups) {
  			for (i = 0; groups[i]; i++)
  				hwdev->groups[ngroups++] = groups[i];
  		}
  
  		hdev->groups = hwdev->groups;
  	} else {
  		hdev->groups = groups;
  	}

  	hwdev->name = name;

  	hdev->class = &hwmon_class;
  	hdev->parent = dev;
  	hdev->of_node = dev ? dev->of_node : NULL;
  	hwdev->chip = chip;
  	dev_set_drvdata(hdev, drvdata);
  	dev_set_name(hdev, HWMON_ID_FORMAT, id);
  	err = device_register(hdev);

  	if (err)

  		goto free_hwmon;

  	INIT_LIST_HEAD(&hwdev->tzdata);

  	if (dev && dev->of_node && chip && chip->ops->read &&

  	    chip->info[0]->type == hwmon_chip &&
  	    (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {

  		err = hwmon_thermal_register_sensors(hdev);
  		if (err) {
  			device_unregister(hdev);
  			/*
  			 * Don't worry about hwdev; hwmon_dev_release(), called
  			 * from device_unregister(), will free it.
  			 */
  			goto ida_remove;

  		}
  	}

  	return hdev;

  free_hwmon:

  	hwmon_dev_release(hdev);

  ida_remove:
  	ida_simple_remove(&hwmon_ida, id);
  	return ERR_PTR(err);
  }

  
  /**
   * hwmon_device_register_with_groups - register w/ hwmon
   * @dev: the parent device
   * @name: hwmon name attribute
   * @drvdata: driver data to attach to created device
   * @groups: List of attribute groups to create
   *
   * hwmon_device_unregister() must be called when the device is no
   * longer needed.
   *
   * Returns the pointer to the new device.
   */
  struct device *
  hwmon_device_register_with_groups(struct device *dev, const char *name,
  				  void *drvdata,
  				  const struct attribute_group **groups)
  {

  	if (!name)
  		return ERR_PTR(-EINVAL);

  	return __hwmon_device_register(dev, name, drvdata, NULL, groups);
  }

  EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);

  /**

   * hwmon_device_register_with_info - register w/ hwmon
   * @dev: the parent device
   * @name: hwmon name attribute
   * @drvdata: driver data to attach to created device

   * @chip: pointer to hwmon chip information

   * @extra_groups: pointer to list of additional non-standard attribute groups

   *
   * hwmon_device_unregister() must be called when the device is no
   * longer needed.
   *
   * Returns the pointer to the new device.
   */
  struct device *
  hwmon_device_register_with_info(struct device *dev, const char *name,
  				void *drvdata,
  				const struct hwmon_chip_info *chip,

  				const struct attribute_group **extra_groups)

  {

  	if (!name)
  		return ERR_PTR(-EINVAL);

  	if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))

  		return ERR_PTR(-EINVAL);

  	if (chip && !dev)
  		return ERR_PTR(-EINVAL);

  	return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);

  }
  EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
  
  /**

   * hwmon_device_register - register w/ hwmon
   * @dev: the device to register
   *
   * hwmon_device_unregister() must be called when the device is no
   * longer needed.
   *
   * Returns the pointer to the new device.
   */
  struct device *hwmon_device_register(struct device *dev)
  {

  	dev_warn(dev,
  		 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().
  ");

  	return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);

  }

  EXPORT_SYMBOL_GPL(hwmon_device_register);

  
  /**
   * hwmon_device_unregister - removes the previously registered class device
   *

   * @dev: the class device to destroy

   */

  void hwmon_device_unregister(struct device *dev)

  {
  	int id;

  	if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {

  		device_unregister(dev);

  		ida_simple_remove(&hwmon_ida, id);

  	} else

  		dev_dbg(dev->parent,

  			"hwmon_device_unregister() failed: bad class ID!
  ");
  }

  EXPORT_SYMBOL_GPL(hwmon_device_unregister);

  static void devm_hwmon_release(struct device *dev, void *res)
  {
  	struct device *hwdev = *(struct device **)res;
  
  	hwmon_device_unregister(hwdev);
  }
  
  /**
   * devm_hwmon_device_register_with_groups - register w/ hwmon
   * @dev: the parent device
   * @name: hwmon name attribute
   * @drvdata: driver data to attach to created device
   * @groups: List of attribute groups to create
   *
   * Returns the pointer to the new device. The new device is automatically
   * unregistered with the parent device.
   */
  struct device *
  devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
  				       void *drvdata,
  				       const struct attribute_group **groups)
  {
  	struct device **ptr, *hwdev;
  
  	if (!dev)
  		return ERR_PTR(-EINVAL);
  
  	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
  	if (!ptr)
  		return ERR_PTR(-ENOMEM);
  
  	hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
  	if (IS_ERR(hwdev))
  		goto error;
  
  	*ptr = hwdev;
  	devres_add(dev, ptr);
  	return hwdev;
  
  error:
  	devres_free(ptr);
  	return hwdev;
  }
  EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);

  /**
   * devm_hwmon_device_register_with_info - register w/ hwmon

   * @dev:	the parent device
   * @name:	hwmon name attribute
   * @drvdata:	driver data to attach to created device
   * @chip:	pointer to hwmon chip information
   * @groups:	pointer to list of driver specific attribute groups

   *
   * Returns the pointer to the new device. The new device is automatically
   * unregistered with the parent device.
   */
  struct device *
  devm_hwmon_device_register_with_info(struct device *dev, const char *name,
  				     void *drvdata,
  				     const struct hwmon_chip_info *chip,
  				     const struct attribute_group **groups)
  {
  	struct device **ptr, *hwdev;
  
  	if (!dev)
  		return ERR_PTR(-EINVAL);
  
  	ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
  	if (!ptr)
  		return ERR_PTR(-ENOMEM);
  
  	hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
  						groups);
  	if (IS_ERR(hwdev))
  		goto error;
  
  	*ptr = hwdev;
  	devres_add(dev, ptr);
  
  	return hwdev;
  
  error:
  	devres_free(ptr);
  	return hwdev;
  }
  EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);

  static int devm_hwmon_match(struct device *dev, void *res, void *data)
  {
  	struct device **hwdev = res;
  
  	return *hwdev == data;
  }
  
  /**
   * devm_hwmon_device_unregister - removes a previously registered hwmon device
   *
   * @dev: the parent device of the device to unregister
   */
  void devm_hwmon_device_unregister(struct device *dev)
  {
  	WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
  }
  EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);

  static void __init hwmon_pci_quirks(void)
  {
  #if defined CONFIG_X86 && defined CONFIG_PCI
  	struct pci_dev *sb;
  	u16 base;
  	u8 enable;
  
  	/* Open access to 0x295-0x296 on MSI MS-7031 */
  	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);

  	if (sb) {
  		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
  		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
  			pci_read_config_byte(sb, 0x48, &enable);
  			pci_read_config_word(sb, 0x64, &base);
  
  			if (base == 0 && !(enable & BIT(2))) {
  				dev_info(&sb->dev,
  					 "Opening wide generic port at 0x295
  ");
  				pci_write_config_word(sb, 0x64, 0x295);
  				pci_write_config_byte(sb, 0x48,
  						      enable | BIT(2));
  			}

  		}

  		pci_dev_put(sb);

  	}
  #endif
  }

  static int __init hwmon_init(void)
  {

  	int err;

  	hwmon_pci_quirks();

  	err = class_register(&hwmon_class);
  	if (err) {
  		pr_err("couldn't register hwmon sysfs class
  ");
  		return err;

  	}
  	return 0;
  }
  
  static void __exit hwmon_exit(void)
  {

  	class_unregister(&hwmon_class);

  }

  subsys_initcall(hwmon_init);

  module_exit(hwmon_exit);

  MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
  MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
  MODULE_LICENSE("GPL");