/*
   *  Sysfs interface for the universal power supply monitor class
   *
   *  Copyright © 2007  David Woodhouse <dwmw2@infradead.org>
   *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   *  Copyright © 2004  Szabolcs Gyurko
   *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   *
   *  Modified: 2004, Oct     Szabolcs Gyurko
   *
   *  You may use this code as per GPL version 2
   */
  
  #include <linux/ctype.h>

  #include <linux/device.h>

  #include <linux/power_supply.h>

  #include <linux/slab.h>

  #include <linux/stat.h>

  #include "power_supply.h"

  /*
   * This is because the name "current" breaks the device attr macro.
   * The "current" word resolves to "(get_current())" so instead of
   * "current" "(get_current())" appears in the sysfs.
   *
   * The source of this definition is the device.h which calls __ATTR
   * macro in sysfs.h which calls the __stringify macro.
   *
   * Only modification that the name is not tried to be resolved
   * (as a macro let's say).
   */
  
  #define POWER_SUPPLY_ATTR(_name)					\
  {									\

  	.attr = { .name = #_name },					\

  	.show = power_supply_show_property,				\

  	.store = power_supply_store_property,				\

  }
  
  static struct device_attribute power_supply_attrs[];
  
  static ssize_t power_supply_show_property(struct device *dev,
  					  struct device_attribute *attr,
  					  char *buf) {

  	static char *type_text[] = {

  		"Unknown", "Battery", "UPS", "Mains", "USB",

  		"USB_DCP", "USB_CDP", "USB_ACA"

  	};

  	static char *status_text[] = {
  		"Unknown", "Charging", "Discharging", "Not charging", "Full"
  	};

  	static char *charge_type[] = {
  		"Unknown", "N/A", "Trickle", "Fast"
  	};

  	static char *health_text[] = {
  		"Unknown", "Good", "Overheat", "Dead", "Over voltage",

  		"Unspecified failure", "Cold", "Watchdog timer expire",
  		"Safety timer expire"

  	};
  	static char *technology_text[] = {

  		"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
  		"LiMn"

  	};

  	static char *capacity_level_text[] = {
  		"Unknown", "Critical", "Low", "Normal", "High", "Full"
  	};

  	static char *scope_text[] = {
  		"Unknown", "System", "Device"
  	};

  	ssize_t ret = 0;

  	struct power_supply *psy = dev_get_drvdata(dev);
  	const ptrdiff_t off = attr - power_supply_attrs;
  	union power_supply_propval value;

  	if (off == POWER_SUPPLY_PROP_TYPE)
  		value.intval = psy->type;
  	else
  		ret = psy->get_property(psy, off, &value);

  
  	if (ret < 0) {

  		if (ret == -ENODATA)
  			dev_dbg(dev, "driver has no data for `%s' property
  ",
  				attr->attr.name);
  		else if (ret != -ENODEV)

  			dev_err(dev, "driver failed to report `%s' property: %zd
  ",

  				attr->attr.name, ret);

  		return ret;
  	}
  
  	if (off == POWER_SUPPLY_PROP_STATUS)
  		return sprintf(buf, "%s
  ", status_text[value.intval]);

  	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
  		return sprintf(buf, "%s
  ", charge_type[value.intval]);

  	else if (off == POWER_SUPPLY_PROP_HEALTH)
  		return sprintf(buf, "%s
  ", health_text[value.intval]);
  	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
  		return sprintf(buf, "%s
  ", technology_text[value.intval]);

  	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
  		return sprintf(buf, "%s
  ", capacity_level_text[value.intval]);

  	else if (off == POWER_SUPPLY_PROP_TYPE)
  		return sprintf(buf, "%s
  ", type_text[value.intval]);

  	else if (off == POWER_SUPPLY_PROP_SCOPE)
  		return sprintf(buf, "%s
  ", scope_text[value.intval]);

  	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
  		return sprintf(buf, "%s
  ", value.strval);
  
  	return sprintf(buf, "%d
  ", value.intval);
  }

  static ssize_t power_supply_store_property(struct device *dev,
  					   struct device_attribute *attr,
  					   const char *buf, size_t count) {
  	ssize_t ret;
  	struct power_supply *psy = dev_get_drvdata(dev);
  	const ptrdiff_t off = attr - power_supply_attrs;
  	union power_supply_propval value;
  	long long_val;
  
  	/* TODO: support other types than int */

  	ret = kstrtol(buf, 10, &long_val);

  	if (ret < 0)
  		return ret;
  
  	value.intval = long_val;
  
  	ret = psy->set_property(psy, off, &value);
  	if (ret < 0)
  		return ret;
  
  	return count;
  }

  /* Must be in the same order as POWER_SUPPLY_PROP_* */
  static struct device_attribute power_supply_attrs[] = {
  	/* Properties of type `int' */
  	POWER_SUPPLY_ATTR(status),

  	POWER_SUPPLY_ATTR(charge_type),

  	POWER_SUPPLY_ATTR(health),
  	POWER_SUPPLY_ATTR(present),
  	POWER_SUPPLY_ATTR(online),

  	POWER_SUPPLY_ATTR(authentic),

  	POWER_SUPPLY_ATTR(technology),

  	POWER_SUPPLY_ATTR(cycle_count),

  	POWER_SUPPLY_ATTR(voltage_max),
  	POWER_SUPPLY_ATTR(voltage_min),

  	POWER_SUPPLY_ATTR(voltage_max_design),
  	POWER_SUPPLY_ATTR(voltage_min_design),
  	POWER_SUPPLY_ATTR(voltage_now),
  	POWER_SUPPLY_ATTR(voltage_avg),

  	POWER_SUPPLY_ATTR(voltage_ocv),

  	POWER_SUPPLY_ATTR(current_max),

  	POWER_SUPPLY_ATTR(current_now),
  	POWER_SUPPLY_ATTR(current_avg),

  	POWER_SUPPLY_ATTR(power_now),
  	POWER_SUPPLY_ATTR(power_avg),

  	POWER_SUPPLY_ATTR(charge_full_design),
  	POWER_SUPPLY_ATTR(charge_empty_design),
  	POWER_SUPPLY_ATTR(charge_full),
  	POWER_SUPPLY_ATTR(charge_empty),
  	POWER_SUPPLY_ATTR(charge_now),
  	POWER_SUPPLY_ATTR(charge_avg),

  	POWER_SUPPLY_ATTR(charge_counter),

  	POWER_SUPPLY_ATTR(constant_charge_current),

  	POWER_SUPPLY_ATTR(constant_charge_current_max),

  	POWER_SUPPLY_ATTR(constant_charge_voltage),

  	POWER_SUPPLY_ATTR(constant_charge_voltage_max),

  	POWER_SUPPLY_ATTR(charge_control_limit),
  	POWER_SUPPLY_ATTR(charge_control_limit_max),

  	POWER_SUPPLY_ATTR(energy_full_design),
  	POWER_SUPPLY_ATTR(energy_empty_design),
  	POWER_SUPPLY_ATTR(energy_full),
  	POWER_SUPPLY_ATTR(energy_empty),
  	POWER_SUPPLY_ATTR(energy_now),
  	POWER_SUPPLY_ATTR(energy_avg),
  	POWER_SUPPLY_ATTR(capacity),

  	POWER_SUPPLY_ATTR(capacity_alert_min),
  	POWER_SUPPLY_ATTR(capacity_alert_max),

  	POWER_SUPPLY_ATTR(capacity_level),

  	POWER_SUPPLY_ATTR(temp),

  	POWER_SUPPLY_ATTR(temp_alert_min),
  	POWER_SUPPLY_ATTR(temp_alert_max),

  	POWER_SUPPLY_ATTR(temp_ambient),

  	POWER_SUPPLY_ATTR(temp_ambient_alert_min),
  	POWER_SUPPLY_ATTR(temp_ambient_alert_max),

  	POWER_SUPPLY_ATTR(time_to_empty_now),
  	POWER_SUPPLY_ATTR(time_to_empty_avg),
  	POWER_SUPPLY_ATTR(time_to_full_now),
  	POWER_SUPPLY_ATTR(time_to_full_avg),

  	POWER_SUPPLY_ATTR(type),

  	POWER_SUPPLY_ATTR(scope),

  	/* Properties of type `const char *' */
  	POWER_SUPPLY_ATTR(model_name),
  	POWER_SUPPLY_ATTR(manufacturer),

  	POWER_SUPPLY_ATTR(serial_number),

  };

  static struct attribute *
  __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];

  static umode_t power_supply_attr_is_visible(struct kobject *kobj,

  					   struct attribute *attr,
  					   int attrno)

  {

  	struct device *dev = container_of(kobj, struct device, kobj);
  	struct power_supply *psy = dev_get_drvdata(dev);

  	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;

  	int i;

  	if (attrno == POWER_SUPPLY_PROP_TYPE)
  		return mode;

  	for (i = 0; i < psy->num_properties; i++) {

  		int property = psy->properties[i];
  
  		if (property == attrno) {

  			if (psy->property_is_writeable &&
  			    psy->property_is_writeable(psy, property) > 0)
  				mode |= S_IWUSR;
  
  			return mode;
  		}

  	}

  	return 0;

  }

  static struct attribute_group power_supply_attr_group = {
  	.attrs = __power_supply_attrs,
  	.is_visible = power_supply_attr_is_visible,
  };
  
  static const struct attribute_group *power_supply_attr_groups[] = {
  	&power_supply_attr_group,
  	NULL,
  };
  
  void power_supply_init_attrs(struct device_type *dev_type)

  {
  	int i;

  	dev_type->groups = power_supply_attr_groups;

  	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
  		__power_supply_attrs[i] = &power_supply_attrs[i].attr;

  }
  
  static char *kstruprdup(const char *str, gfp_t gfp)
  {
  	char *ret, *ustr;
  
  	ustr = ret = kmalloc(strlen(str) + 1, gfp);
  
  	if (!ret)
  		return NULL;
  
  	while (*str)
  		*ustr++ = toupper(*str++);
  
  	*ustr = 0;
  
  	return ret;
  }

  int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)

  {
  	struct power_supply *psy = dev_get_drvdata(dev);

  	int ret = 0, j;

  	char *prop_buf;
  	char *attrname;
  
  	dev_dbg(dev, "uevent
  ");

  	if (!psy || !psy->dev) {

  		dev_dbg(dev, "No power supply yet
  ");
  		return ret;
  	}
  
  	dev_dbg(dev, "POWER_SUPPLY_NAME=%s
  ", psy->name);

  	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);

  	if (ret)
  		return ret;
  
  	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
  	if (!prop_buf)
  		return -ENOMEM;

  	for (j = 0; j < psy->num_properties; j++) {
  		struct device_attribute *attr;
  		char *line;
  
  		attr = &power_supply_attrs[psy->properties[j]];
  
  		ret = power_supply_show_property(dev, attr, prop_buf);

  		if (ret == -ENODEV || ret == -ENODATA) {

  			/* When a battery is absent, we expect -ENODEV. Don't abort;
  			   send the uevent with at least the the PRESENT=0 property */
  			ret = 0;
  			continue;
  		}
  
  		if (ret < 0)
  			goto out;
  
  		line = strchr(prop_buf, '
  ');
  		if (line)
  			*line = 0;
  
  		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
  		if (!attrname) {
  			ret = -ENOMEM;
  			goto out;
  		}
  
  		dev_dbg(dev, "prop %s=%s
  ", attrname, prop_buf);

  		ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);

  		kfree(attrname);
  		if (ret)
  			goto out;
  	}
  
  out:
  	free_page((unsigned long)prop_buf);
  
  	return ret;
  }