[linux-2.6-block.git] / drivers / power / supply / power_supply_sysfs.c

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

#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/string_helpers.h>

#include "power_supply.h"

#define MAX_PROP_NAME_LEN 30

struct power_supply_attr {
	const char *prop_name;
	char attr_name[MAX_PROP_NAME_LEN + 1];
	struct device_attribute dev_attr;
	const char * const *text_values;
	int text_values_len;
};

#define _POWER_SUPPLY_ATTR(_name, _text, _len)	\
[POWER_SUPPLY_PROP_ ## _name] =			\
{						\
	.prop_name = #_name,			\
	.attr_name = #_name "\0",		\
	.text_values = _text,			\
	.text_values_len = _len,		\
}

#define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0)
#define _POWER_SUPPLY_ENUM_ATTR(_name, _text)	\
	_POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text))
#define POWER_SUPPLY_ENUM_ATTR(_name)	\
	_POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT)

static const char * const POWER_SUPPLY_TYPE_TEXT[] = {
	[POWER_SUPPLY_TYPE_UNKNOWN]		= "Unknown",
	[POWER_SUPPLY_TYPE_BATTERY]		= "Battery",
	[POWER_SUPPLY_TYPE_UPS]			= "UPS",
	[POWER_SUPPLY_TYPE_MAINS]		= "Mains",
	[POWER_SUPPLY_TYPE_USB]			= "USB",
	[POWER_SUPPLY_TYPE_USB_DCP]		= "USB_DCP",
	[POWER_SUPPLY_TYPE_USB_CDP]		= "USB_CDP",
	[POWER_SUPPLY_TYPE_USB_ACA]		= "USB_ACA",
	[POWER_SUPPLY_TYPE_USB_TYPE_C]		= "USB_C",
	[POWER_SUPPLY_TYPE_USB_PD]		= "USB_PD",
	[POWER_SUPPLY_TYPE_USB_PD_DRP]		= "USB_PD_DRP",
	[POWER_SUPPLY_TYPE_APPLE_BRICK_ID]	= "BrickID",
	[POWER_SUPPLY_TYPE_WIRELESS]		= "Wireless",
};

static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = {
	[POWER_SUPPLY_USB_TYPE_UNKNOWN]		= "Unknown",
	[POWER_SUPPLY_USB_TYPE_SDP]		= "SDP",
	[POWER_SUPPLY_USB_TYPE_DCP]		= "DCP",
	[POWER_SUPPLY_USB_TYPE_CDP]		= "CDP",
	[POWER_SUPPLY_USB_TYPE_ACA]		= "ACA",
	[POWER_SUPPLY_USB_TYPE_C]		= "C",
	[POWER_SUPPLY_USB_TYPE_PD]		= "PD",
	[POWER_SUPPLY_USB_TYPE_PD_DRP]		= "PD_DRP",
	[POWER_SUPPLY_USB_TYPE_PD_PPS]		= "PD_PPS",
	[POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID]	= "BrickID",
};

static const char * const POWER_SUPPLY_STATUS_TEXT[] = {
	[POWER_SUPPLY_STATUS_UNKNOWN]		= "Unknown",
	[POWER_SUPPLY_STATUS_CHARGING]		= "Charging",
	[POWER_SUPPLY_STATUS_DISCHARGING]	= "Discharging",
	[POWER_SUPPLY_STATUS_NOT_CHARGING]	= "Not charging",
	[POWER_SUPPLY_STATUS_FULL]		= "Full",
};

static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
	[POWER_SUPPLY_CHARGE_TYPE_UNKNOWN]	= "Unknown",
	[POWER_SUPPLY_CHARGE_TYPE_NONE]		= "N/A",
	[POWER_SUPPLY_CHARGE_TYPE_TRICKLE]	= "Trickle",
	[POWER_SUPPLY_CHARGE_TYPE_FAST]		= "Fast",
	[POWER_SUPPLY_CHARGE_TYPE_STANDARD]	= "Standard",
	[POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE]	= "Adaptive",
	[POWER_SUPPLY_CHARGE_TYPE_CUSTOM]	= "Custom",
	[POWER_SUPPLY_CHARGE_TYPE_LONGLIFE]	= "Long Life",
	[POWER_SUPPLY_CHARGE_TYPE_BYPASS]	= "Bypass",
};

static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
	[POWER_SUPPLY_HEALTH_UNKNOWN]		    = "Unknown",
	[POWER_SUPPLY_HEALTH_GOOD]		    = "Good",
	[POWER_SUPPLY_HEALTH_OVERHEAT]		    = "Overheat",
	[POWER_SUPPLY_HEALTH_DEAD]		    = "Dead",
	[POWER_SUPPLY_HEALTH_OVERVOLTAGE]	    = "Over voltage",
	[POWER_SUPPLY_HEALTH_UNSPEC_FAILURE]	    = "Unspecified failure",
	[POWER_SUPPLY_HEALTH_COLD]		    = "Cold",
	[POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
	[POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE]   = "Safety timer expire",
	[POWER_SUPPLY_HEALTH_OVERCURRENT]	    = "Over current",
	[POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED]  = "Calibration required",
	[POWER_SUPPLY_HEALTH_WARM]		    = "Warm",
	[POWER_SUPPLY_HEALTH_COOL]		    = "Cool",
	[POWER_SUPPLY_HEALTH_HOT]		    = "Hot",
	[POWER_SUPPLY_HEALTH_NO_BATTERY]	    = "No battery",
};

static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
	[POWER_SUPPLY_TECHNOLOGY_UNKNOWN]	= "Unknown",
	[POWER_SUPPLY_TECHNOLOGY_NiMH]		= "NiMH",
	[POWER_SUPPLY_TECHNOLOGY_LION]		= "Li-ion",
	[POWER_SUPPLY_TECHNOLOGY_LIPO]		= "Li-poly",
	[POWER_SUPPLY_TECHNOLOGY_LiFe]		= "LiFe",
	[POWER_SUPPLY_TECHNOLOGY_NiCd]		= "NiCd",
	[POWER_SUPPLY_TECHNOLOGY_LiMn]		= "LiMn",
};

static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
	[POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN]	= "Unknown",
	[POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL]	= "Critical",
	[POWER_SUPPLY_CAPACITY_LEVEL_LOW]	= "Low",
	[POWER_SUPPLY_CAPACITY_LEVEL_NORMAL]	= "Normal",
	[POWER_SUPPLY_CAPACITY_LEVEL_HIGH]	= "High",
	[POWER_SUPPLY_CAPACITY_LEVEL_FULL]	= "Full",
};

static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
	[POWER_SUPPLY_SCOPE_UNKNOWN]	= "Unknown",
	[POWER_SUPPLY_SCOPE_SYSTEM]	= "System",
	[POWER_SUPPLY_SCOPE_DEVICE]	= "Device",
};

static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
	[POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO]		= "auto",
	[POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE]	= "inhibit-charge",
	[POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE]	= "force-discharge",
};

static struct power_supply_attr power_supply_attrs[] = {
	/* Properties of type `int' */
	POWER_SUPPLY_ENUM_ATTR(STATUS),
	POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
	POWER_SUPPLY_ENUM_ATTR(HEALTH),
	POWER_SUPPLY_ATTR(PRESENT),
	POWER_SUPPLY_ATTR(ONLINE),
	POWER_SUPPLY_ATTR(AUTHENTIC),
	POWER_SUPPLY_ENUM_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(VOLTAGE_BOOT),
	POWER_SUPPLY_ATTR(CURRENT_MAX),
	POWER_SUPPLY_ATTR(CURRENT_NOW),
	POWER_SUPPLY_ATTR(CURRENT_AVG),
	POWER_SUPPLY_ATTR(CURRENT_BOOT),
	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(CHARGE_CONTROL_START_THRESHOLD),
	POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
	POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
	POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
	POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
	POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
	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_ERROR_MARGIN),
	POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
	POWER_SUPPLY_ATTR(TEMP),
	POWER_SUPPLY_ATTR(TEMP_MAX),
	POWER_SUPPLY_ATTR(TEMP_MIN),
	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_ENUM_ATTR(TYPE),
	POWER_SUPPLY_ATTR(USB_TYPE),
	POWER_SUPPLY_ENUM_ATTR(SCOPE),
	POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
	POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
	POWER_SUPPLY_ATTR(CALIBRATE),
	POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
	POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
	POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
	/* Properties of type `const char *' */
	POWER_SUPPLY_ATTR(MODEL_NAME),
	POWER_SUPPLY_ATTR(MANUFACTURER),
	POWER_SUPPLY_ATTR(SERIAL_NUMBER),
};
#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)

static struct attribute *
__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];

static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
{
	return container_of(attr, struct power_supply_attr, dev_attr);
}

static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
{
	return  to_ps_attr(attr) - power_supply_attrs;
}

static ssize_t power_supply_show_usb_type(struct device *dev,
					  const struct power_supply_desc *desc,
					  union power_supply_propval *value,
					  char *buf)
{
	enum power_supply_usb_type usb_type;
	ssize_t count = 0;
	bool match = false;
	int i;

	for (i = 0; i < desc->num_usb_types; ++i) {
		usb_type = desc->usb_types[i];

		if (value->intval == usb_type) {
			count += sysfs_emit_at(buf, count, "[%s] ",
					 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
			match = true;
		} else {
			count += sysfs_emit_at(buf, count, "%s ",
					 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
		}
	}

	if (!match) {
		dev_warn(dev, "driver reporting unsupported connected type\n");
		return -EINVAL;
	}

	if (count)
		buf[count - 1] = '\n';

	return count;
}

static ssize_t power_supply_show_property(struct device *dev,
					  struct device_attribute *attr,
					  char *buf) {
	ssize_t ret;
	struct power_supply *psy = dev_get_drvdata(dev);
	struct power_supply_attr *ps_attr = to_ps_attr(attr);
	enum power_supply_property psp = dev_attr_psp(attr);
	union power_supply_propval value;

	if (psp == POWER_SUPPLY_PROP_TYPE) {
		value.intval = psy->desc->type;
	} else {
		ret = power_supply_get_property(psy, psp, &value);

		if (ret < 0) {
			if (ret == -ENODATA)
				dev_dbg_ratelimited(dev,
					"driver has no data for `%s' property\n",
					attr->attr.name);
			else if (ret != -ENODEV && ret != -EAGAIN)
				dev_err_ratelimited(dev,
					"driver failed to report `%s' property: %zd\n",
					attr->attr.name, ret);
			return ret;
		}
	}

	switch (psp) {
	case POWER_SUPPLY_PROP_USB_TYPE:
		ret = power_supply_show_usb_type(dev, psy->desc,
						&value, buf);
		break;
	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
		ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
							 value.intval, buf);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
		ret = sysfs_emit(buf, "%s\n", value.strval);
		break;
	default:
		if (ps_attr->text_values_len > 0 &&
				value.intval < ps_attr->text_values_len && value.intval >= 0) {
			ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
		} else {
			ret = sysfs_emit(buf, "%d\n", value.intval);
		}
	}

	return ret;
}

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);
	struct power_supply_attr *ps_attr = to_ps_attr(attr);
	enum power_supply_property psp = dev_attr_psp(attr);
	union power_supply_propval value;

	ret = -EINVAL;
	if (ps_attr->text_values_len > 0) {
		ret = __sysfs_match_string(ps_attr->text_values,
					   ps_attr->text_values_len, buf);
	}

	/*
	 * If no match was found, then check to see if it is an integer.
	 * Integer values are valid for enums in addition to the text value.
	 */
	if (ret < 0) {
		long long_val;

		ret = kstrtol(buf, 10, &long_val);
		if (ret < 0)
			return ret;

		ret = long_val;
	}

	value.intval = ret;

	ret = power_supply_set_property(psy, psp, &value);
	if (ret < 0)
		return ret;

	return count;
}

static umode_t power_supply_attr_is_visible(struct kobject *kobj,
					   struct attribute *attr,
					   int attrno)
{
	struct device *dev = kobj_to_dev(kobj);
	struct power_supply *psy = dev_get_drvdata(dev);
	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
	int i;

	if (!power_supply_attrs[attrno].prop_name)
		return 0;

	if (attrno == POWER_SUPPLY_PROP_TYPE)
		return mode;

	for (i = 0; i < psy->desc->num_properties; i++) {
		int property = psy->desc->properties[i];

		if (property == attrno) {
			if (psy->desc->property_is_writeable &&
			    psy->desc->property_is_writeable(psy, property) > 0)
				mode |= S_IWUSR;

			return mode;
		}
	}

	if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
		return mode;

	return 0;
}

static const struct attribute_group power_supply_attr_group = {
	.attrs = __power_supply_attrs,
	.is_visible = power_supply_attr_is_visible,
};

const struct attribute_group *power_supply_attr_groups[] = {
	&power_supply_attr_group,
	NULL
};

void power_supply_init_attrs(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
		struct device_attribute *attr;

		if (!power_supply_attrs[i].prop_name) {
			pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
				__func__, i);
			sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
		} else {
			string_lower(power_supply_attrs[i].attr_name,
				     power_supply_attrs[i].attr_name);
		}

		attr = &power_supply_attrs[i].dev_attr;

		attr->attr.name = power_supply_attrs[i].attr_name;
		attr->show = power_supply_show_property;
		attr->store = power_supply_store_property;
		__power_supply_attrs[i] = &attr->attr;
	}
}

static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
			   enum power_supply_property prop, char *prop_buf)
{
	int ret = 0;
	struct power_supply_attr *pwr_attr;
	struct device_attribute *dev_attr;
	char *line;

	pwr_attr = &power_supply_attrs[prop];
	dev_attr = &pwr_attr->dev_attr;

	ret = power_supply_show_property((struct device *)dev, 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 PRESENT=0 property
		 */
		return 0;
	}

	if (ret < 0)
		return ret;

	line = strchr(prop_buf, '\n');
	if (line)
		*line = 0;

	return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
			      pwr_attr->prop_name, prop_buf);
}

int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
	const struct power_supply *psy = dev_get_drvdata(dev);
	const enum power_supply_property *battery_props =
		power_supply_battery_info_properties;
	unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
					 sizeof(unsigned long) + 1] = {0};
	int ret = 0, j;
	char *prop_buf;

	if (!psy || !psy->desc) {
		dev_dbg(dev, "No power supply yet\n");
		return ret;
	}

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

	/*
	 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
	 * resources have been freed. Exit early to avoid use-after-free.
	 */
	if (psy->removing)
		return 0;

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

	ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
	if (ret)
		goto out;

	for (j = 0; j < psy->desc->num_properties; j++) {
		set_bit(psy->desc->properties[j], psy_drv_properties);
		ret = add_prop_uevent(dev, env, psy->desc->properties[j],
				      prop_buf);
		if (ret)
			goto out;
	}

	for (j = 0; j < power_supply_battery_info_properties_size; j++) {
		if (test_bit(battery_props[j], psy_drv_properties))
			continue;
		if (!power_supply_battery_info_has_prop(psy->battery_info,
				battery_props[j]))
			continue;
		ret = add_prop_uevent(dev, env, battery_props[j],
			      prop_buf);
		if (ret)
			goto out;
	}

out:
	free_page((unsigned long)prop_buf);

	return ret;
}

ssize_t power_supply_charge_behaviour_show(struct device *dev,
					   unsigned int available_behaviours,
					   enum power_supply_charge_behaviour current_behaviour,
					   char *buf)
{
	bool match = false, available, active;
	ssize_t count = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
		available = available_behaviours & BIT(i);
		active = i == current_behaviour;

		if (available && active) {
			count += sysfs_emit_at(buf, count, "[%s] ",
					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
			match = true;
		} else if (available) {
			count += sysfs_emit_at(buf, count, "%s ",
					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
		}
	}

	if (!match) {
		dev_warn(dev, "driver reporting unsupported charge behaviour\n");
		return -EINVAL;
	}

	if (count)
		buf[count - 1] = '\n';

	return count;
}
EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);

int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
{
	int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);

	if (i < 0)
		return i;

	if (available_behaviours & BIT(i))
		return i;

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
Commit	Line	Data
a63a5fa9	1	// SPDX-License-Identifier: GPL-2.0-only
4a11b59d AV	2	/*
	3	* Sysfs interface for the universal power supply monitor class
	4	*
	5	* Copyright © 2007 David Woodhouse <dwmw2@infradead.org>
	6	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	7	* Copyright © 2004 Szabolcs Gyurko
	8	* Copyright © 2003 Ian Molton <spyro@f2s.com>
	9	*
	10	* Modified: 2004, Oct Szabolcs Gyurko
4a11b59d AV	11	*/
	12
	13	#include <linux/ctype.h>
51990e82	14	#include <linux/device.h>
4a11b59d	15	#include <linux/power_supply.h>
5a0e3ad6	16	#include <linux/slab.h>
778f523d	17	#include <linux/stat.h>
0ce51459	18	#include <linux/string_helpers.h>
4a11b59d	19
25f12141 AB	20	#include "power_supply.h"
25f12141 AB	21
2cabeaf1	22	#define MAX_PROP_NAME_LEN 30
4a11b59d	23
2cabeaf1 MK	24	struct power_supply_attr {
	25	const char *prop_name;
	26	char attr_name[MAX_PROP_NAME_LEN + 1];
	27	struct device_attribute dev_attr;
5b505366 MK	28	const char * const *text_values;
5b505366 MK	29	int text_values_len;
2cabeaf1	30	};
4a11b59d	31
5b505366 MK	32	#define _POWER_SUPPLY_ATTR(_name, _text, _len) \
	33	[POWER_SUPPLY_PROP_ ## _name] = \
	34	{ \
	35	.prop_name = #_name, \
	36	.attr_name = #_name "\0", \
	37	.text_values = _text, \
	38	.text_values_len = _len, \
2cabeaf1	39	}
4a11b59d	40
5b505366 MK	41	#define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0)
	42	#define _POWER_SUPPLY_ENUM_ATTR(_name, _text) \
	43	_POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text))
	44	#define POWER_SUPPLY_ENUM_ATTR(_name) \
	45	_POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT)
	46
	47	static const char * const POWER_SUPPLY_TYPE_TEXT[] = {
d960d91f MK	48	[POWER_SUPPLY_TYPE_UNKNOWN] = "Unknown",
	49	[POWER_SUPPLY_TYPE_BATTERY] = "Battery",
	50	[POWER_SUPPLY_TYPE_UPS] = "UPS",
	51	[POWER_SUPPLY_TYPE_MAINS] = "Mains",
	52	[POWER_SUPPLY_TYPE_USB] = "USB",
	53	[POWER_SUPPLY_TYPE_USB_DCP] = "USB_DCP",
	54	[POWER_SUPPLY_TYPE_USB_CDP] = "USB_CDP",
	55	[POWER_SUPPLY_TYPE_USB_ACA] = "USB_ACA",
	56	[POWER_SUPPLY_TYPE_USB_TYPE_C] = "USB_C",
	57	[POWER_SUPPLY_TYPE_USB_PD] = "USB_PD",
	58	[POWER_SUPPLY_TYPE_USB_PD_DRP] = "USB_PD_DRP",
	59	[POWER_SUPPLY_TYPE_APPLE_BRICK_ID] = "BrickID",
5ca937fb	60	[POWER_SUPPLY_TYPE_WIRELESS] = "Wireless",
105df60f DL	61	};
105df60f DL	62
5b505366	63	static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = {
d960d91f MK	64	[POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown",
	65	[POWER_SUPPLY_USB_TYPE_SDP] = "SDP",
	66	[POWER_SUPPLY_USB_TYPE_DCP] = "DCP",
	67	[POWER_SUPPLY_USB_TYPE_CDP] = "CDP",
	68	[POWER_SUPPLY_USB_TYPE_ACA] = "ACA",
	69	[POWER_SUPPLY_USB_TYPE_C] = "C",
	70	[POWER_SUPPLY_USB_TYPE_PD] = "PD",
	71	[POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP",
	72	[POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS",
	73	[POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID",
cf450041 AT	74	};
cf450041 AT	75
5b505366	76	static const char * const POWER_SUPPLY_STATUS_TEXT[] = {
d960d91f MK	77	[POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
	78	[POWER_SUPPLY_STATUS_CHARGING] = "Charging",
	79	[POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
	80	[POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
	81	[POWER_SUPPLY_STATUS_FULL] = "Full",
105df60f DL	82	};
105df60f DL	83
5b505366	84	static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
d960d91f MK	85	[POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown",
	86	[POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A",
	87	[POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle",
	88	[POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast",
	89	[POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard",
	90	[POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive",
	91	[POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom",
46cbd0b0	92	[POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life",
05f2281b	93	[POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass",
105df60f DL	94	};
105df60f DL	95
5b505366	96	static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
d960d91f MK	97	[POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown",
	98	[POWER_SUPPLY_HEALTH_GOOD] = "Good",
	99	[POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat",
	100	[POWER_SUPPLY_HEALTH_DEAD] = "Dead",
	101	[POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage",
	102	[POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure",
	103	[POWER_SUPPLY_HEALTH_COLD] = "Cold",
	104	[POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
	105	[POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire",
	106	[POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current",
601c2a54	107	[POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required",
98cc1b93 DM	108	[POWER_SUPPLY_HEALTH_WARM] = "Warm",
	109	[POWER_SUPPLY_HEALTH_COOL] = "Cool",
	110	[POWER_SUPPLY_HEALTH_HOT] = "Hot",
77d641ba	111	[POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery",
105df60f DL	112	};
105df60f DL	113
5b505366	114	static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
d960d91f MK	115	[POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown",
	116	[POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH",
	117	[POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion",
	118	[POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly",
	119	[POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe",
	120	[POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd",
	121	[POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn",
105df60f DL	122	};
105df60f DL	123
5b505366	124	static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
d960d91f MK	125	[POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown",
	126	[POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical",
	127	[POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low",
	128	[POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal",
	129	[POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High",
	130	[POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full",
105df60f DL	131	};
105df60f DL	132
5b505366	133	static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
d960d91f MK	134	[POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown",
	135	[POWER_SUPPLY_SCOPE_SYSTEM] = "System",
	136	[POWER_SUPPLY_SCOPE_DEVICE] = "Device",
105df60f DL	137	};
105df60f DL	138
539b9c94 TW	139	static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
	140	[POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto",
	141	[POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge",
	142	[POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
	143	};
	144
2cabeaf1 MK	145	static struct power_supply_attr power_supply_attrs[] = {
2cabeaf1 MK	146	/* Properties of type `int' */
5b505366 MK	147	POWER_SUPPLY_ENUM_ATTR(STATUS),
	148	POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
	149	POWER_SUPPLY_ENUM_ATTR(HEALTH),
2cabeaf1 MK	150	POWER_SUPPLY_ATTR(PRESENT),
	151	POWER_SUPPLY_ATTR(ONLINE),
	152	POWER_SUPPLY_ATTR(AUTHENTIC),
5b505366	153	POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
2cabeaf1 MK	154	POWER_SUPPLY_ATTR(CYCLE_COUNT),
	155	POWER_SUPPLY_ATTR(VOLTAGE_MAX),
	156	POWER_SUPPLY_ATTR(VOLTAGE_MIN),
	157	POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
	158	POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
	159	POWER_SUPPLY_ATTR(VOLTAGE_NOW),
	160	POWER_SUPPLY_ATTR(VOLTAGE_AVG),
	161	POWER_SUPPLY_ATTR(VOLTAGE_OCV),
	162	POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
	163	POWER_SUPPLY_ATTR(CURRENT_MAX),
	164	POWER_SUPPLY_ATTR(CURRENT_NOW),
	165	POWER_SUPPLY_ATTR(CURRENT_AVG),
	166	POWER_SUPPLY_ATTR(CURRENT_BOOT),
	167	POWER_SUPPLY_ATTR(POWER_NOW),
	168	POWER_SUPPLY_ATTR(POWER_AVG),
	169	POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
	170	POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
	171	POWER_SUPPLY_ATTR(CHARGE_FULL),
	172	POWER_SUPPLY_ATTR(CHARGE_EMPTY),
	173	POWER_SUPPLY_ATTR(CHARGE_NOW),
	174	POWER_SUPPLY_ATTR(CHARGE_AVG),
	175	POWER_SUPPLY_ATTR(CHARGE_COUNTER),
	176	POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
	177	POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
	178	POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
	179	POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
	180	POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
	181	POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
	182	POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
	183	POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
c8e2d921	184	POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
2cabeaf1 MK	185	POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
	186	POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
	187	POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
	188	POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
	189	POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
	190	POWER_SUPPLY_ATTR(ENERGY_FULL),
	191	POWER_SUPPLY_ATTR(ENERGY_EMPTY),
	192	POWER_SUPPLY_ATTR(ENERGY_NOW),
	193	POWER_SUPPLY_ATTR(ENERGY_AVG),
	194	POWER_SUPPLY_ATTR(CAPACITY),
	195	POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
	196	POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
bac705ab	197	POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
5b505366	198	POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
2cabeaf1 MK	199	POWER_SUPPLY_ATTR(TEMP),
	200	POWER_SUPPLY_ATTR(TEMP_MAX),
	201	POWER_SUPPLY_ATTR(TEMP_MIN),
	202	POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
	203	POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
	204	POWER_SUPPLY_ATTR(TEMP_AMBIENT),
	205	POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
	206	POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
	207	POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
	208	POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
	209	POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
	210	POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
5b505366	211	POWER_SUPPLY_ENUM_ATTR(TYPE),
2cabeaf1	212	POWER_SUPPLY_ATTR(USB_TYPE),
5b505366	213	POWER_SUPPLY_ENUM_ATTR(SCOPE),
2cabeaf1 MK	214	POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
	215	POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
	216	POWER_SUPPLY_ATTR(CALIBRATE),
feabe49e SR	217	POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
	218	POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
	219	POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
2cabeaf1 MK	220	/* Properties of type `const char ' /
	221	POWER_SUPPLY_ATTR(MODEL_NAME),
	222	POWER_SUPPLY_ATTR(MANUFACTURER),
	223	POWER_SUPPLY_ATTR(SERIAL_NUMBER),
	224	};
27a2195e	225	#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
2cabeaf1 MK	226
2cabeaf1 MK	227	static struct attribute *
27a2195e	228	__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
2cabeaf1	229
5b505366 MK	230	static struct power_supply_attr to_ps_attr(struct device_attribute attr)
	231	{
	232	return container_of(attr, struct power_supply_attr, dev_attr);
	233	}
	234
2cabeaf1 MK	235	static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
2cabeaf1 MK	236	{
5b505366	237	return to_ps_attr(attr) - power_supply_attrs;
2cabeaf1 MK	238	}
2cabeaf1 MK	239
cf450041	240	static ssize_t power_supply_show_usb_type(struct device *dev,
de46e028	241	const struct power_supply_desc *desc,
cf450041 AT	242	union power_supply_propval *value,
	243	char *buf)
	244	{
	245	enum power_supply_usb_type usb_type;
	246	ssize_t count = 0;
	247	bool match = false;
	248	int i;
	249
de46e028 MM	250	for (i = 0; i < desc->num_usb_types; ++i) {
de46e028 MM	251	usb_type = desc->usb_types[i];
cf450041 AT	252
cf450041 AT	253	if (value->intval == usb_type) {
a441f3b9	254	count += sysfs_emit_at(buf, count, "[%s] ",
5b505366	255	POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
cf450041 AT	256	match = true;
cf450041 AT	257	} else {
a441f3b9	258	count += sysfs_emit_at(buf, count, "%s ",
5b505366	259	POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
cf450041 AT	260	}
	261	}
	262
	263	if (!match) {
	264	dev_warn(dev, "driver reporting unsupported connected type\n");
	265	return -EINVAL;
	266	}
	267
	268	if (count)
	269	buf[count - 1] = '\n';
	270
	271	return count;
	272	}
	273
4a11b59d AV	274	static ssize_t power_supply_show_property(struct device *dev,
	275	struct device_attribute *attr,
	276	char *buf) {
39b4fb80	277	ssize_t ret;
4a11b59d	278	struct power_supply *psy = dev_get_drvdata(dev);
5b505366	279	struct power_supply_attr *ps_attr = to_ps_attr(attr);
2cabeaf1	280	enum power_supply_property psp = dev_attr_psp(attr);
4a11b59d AV	281	union power_supply_propval value;
4a11b59d AV	282
39b4fb80	283	if (psp == POWER_SUPPLY_PROP_TYPE) {
297d716f	284	value.intval = psy->desc->type;
73b4a087	285	} else {
39b4fb80	286	ret = power_supply_get_property(psy, psp, &value);
4a11b59d	287
73b4a087 VK	288	if (ret < 0) {
73b4a087 VK	289	if (ret == -ENODATA)
155c45a2 MV	290	dev_dbg_ratelimited(dev,
155c45a2 MV	291	"driver has no data for `%s' property\n",
73b4a087	292	attr->attr.name);
e3805385	293	else if (ret != -ENODEV && ret != -EAGAIN)
87a2b65f DL	294	dev_err_ratelimited(dev,
87a2b65f DL	295	"driver failed to report `%s' property: %zd\n",
73b4a087 VK	296	attr->attr.name, ret);
	297	return ret;
	298	}
4a11b59d AV	299	}
4a11b59d AV	300
39b4fb80	301	switch (psp) {
1f140ff4	302	case POWER_SUPPLY_PROP_USB_TYPE:
de46e028	303	ret = power_supply_show_usb_type(dev, psy->desc,
5b505366	304	&value, buf);
39b4fb80	305	break;
4e61f1e9	306	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
91b623cd TW	307	ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
91b623cd TW	308	value.intval, buf);
4e61f1e9	309	break;
39b4fb80	310	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
a441f3b9	311	ret = sysfs_emit(buf, "%s\n", value.strval);
39b4fb80 LM	312	break;
39b4fb80 LM	313	default:
521d75b4 TW	314	if (ps_attr->text_values_len > 0 &&
	315	value.intval < ps_attr->text_values_len && value.intval >= 0) {
	316	ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
	317	} else {
	318	ret = sysfs_emit(buf, "%d\n", value.intval);
	319	}
39b4fb80 LM	320	}
	321
	322	return ret;
4a11b59d AV	323	}
4a11b59d AV	324
0011d2d4 DM	325	static ssize_t power_supply_store_property(struct device *dev,
	326	struct device_attribute *attr,
	327	const char *buf, size_t count) {
	328	ssize_t ret;
	329	struct power_supply *psy = dev_get_drvdata(dev);
5b505366	330	struct power_supply_attr *ps_attr = to_ps_attr(attr);
2cabeaf1	331	enum power_supply_property psp = dev_attr_psp(attr);
0011d2d4	332	union power_supply_propval value;
0011d2d4	333
5b505366 MK	334	ret = -EINVAL;
	335	if (ps_attr->text_values_len > 0) {
	336	ret = __sysfs_match_string(ps_attr->text_values,
	337	ps_attr->text_values_len, buf);
105df60f DL	338	}
	339
	340	/*
	341	* If no match was found, then check to see if it is an integer.
	342	* Integer values are valid for enums in addition to the text value.
	343	*/
	344	if (ret < 0) {
	345	long long_val;
	346
	347	ret = kstrtol(buf, 10, &long_val);
	348	if (ret < 0)
	349	return ret;
	350
	351	ret = long_val;
	352	}
0011d2d4	353
105df60f	354	value.intval = ret;
0011d2d4	355
39b4fb80	356	ret = power_supply_set_property(psy, psp, &value);
0011d2d4 DM	357	if (ret < 0)
	358	return ret;
	359
	360	return count;
	361	}
	362
587a1f16	363	static umode_t power_supply_attr_is_visible(struct kobject *kobj,
5f487cd3 AV	364	struct attribute *attr,
5f487cd3 AV	365	int attrno)
4a11b59d	366	{
224941c9	367	struct device *dev = kobj_to_dev(kobj);
5f487cd3	368	struct power_supply *psy = dev_get_drvdata(dev);
587a1f16	369	umode_t mode = S_IRUSR \| S_IRGRP \| S_IROTH;
5f487cd3	370	int i;
4a11b59d	371
2cabeaf1 MK	372	if (!power_supply_attrs[attrno].prop_name)
	373	return 0;
	374
bbabb158 DM	375	if (attrno == POWER_SUPPLY_PROP_TYPE)
	376	return mode;
	377
297d716f KK	378	for (i = 0; i < psy->desc->num_properties; i++) {
297d716f KK	379	int property = psy->desc->properties[i];
0011d2d4 DM	380
0011d2d4 DM	381	if (property == attrno) {
297d716f	382	if (psy->desc->property_is_writeable &&
5c6e3a97	383	psy->desc->property_is_writeable(psy, property) > 0)
0011d2d4 DM	384	mode \|= S_IWUSR;
	385
	386	return mode;
	387	}
4a11b59d AV	388	}
4a11b59d AV	389
27a2195e SR	390	if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
	391	return mode;
	392
5f487cd3	393	return 0;
4a11b59d AV	394	}
4a11b59d AV	395
f107e6b8	396	static const struct attribute_group power_supply_attr_group = {
5f487cd3 AV	397	.attrs = __power_supply_attrs,
	398	.is_visible = power_supply_attr_is_visible,
	399	};
	400
f107e6b8 RM	401	const struct attribute_group *power_supply_attr_groups[] = {
	402	&power_supply_attr_group,
	403	NULL
	404	};
	405
7b46b609	406	void power_supply_init_attrs(void)
4a11b59d	407	{
2cabeaf1	408	int i;
4a11b59d	409
2cabeaf1 MK	410	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
2cabeaf1 MK	411	struct device_attribute *attr;
4a11b59d	412
2cabeaf1	413	if (!power_supply_attrs[i].prop_name) {
c2362519	414	pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
2cabeaf1 MK	415	__func__, i);
	416	sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
	417	} else {
0ce51459 TW	418	string_lower(power_supply_attrs[i].attr_name,
0ce51459 TW	419	power_supply_attrs[i].attr_name);
2cabeaf1	420	}
4a11b59d	421
2cabeaf1	422	attr = &power_supply_attrs[i].dev_attr;
4a11b59d	423
2cabeaf1 MK	424	attr->attr.name = power_supply_attrs[i].attr_name;
	425	attr->show = power_supply_show_property;
	426	attr->store = power_supply_store_property;
	427	__power_supply_attrs[i] = &attr->attr;
	428	}
4a11b59d AV	429	}
4a11b59d AV	430
23680f0b	431	static int add_prop_uevent(const struct device dev, struct kobj_uevent_env env,
2ad3d74e MK	432	enum power_supply_property prop, char *prop_buf)
	433	{
	434	int ret = 0;
	435	struct power_supply_attr *pwr_attr;
	436	struct device_attribute *dev_attr;
	437	char *line;
	438
	439	pwr_attr = &power_supply_attrs[prop];
	440	dev_attr = &pwr_attr->dev_attr;
	441
23680f0b	442	ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf);
2ad3d74e MK	443	if (ret == -ENODEV \|\| ret == -ENODATA) {
	444	/*
	445	* When a battery is absent, we expect -ENODEV. Don't abort;
5ae6134e	446	* send the uevent with at least the PRESENT=0 property
2ad3d74e MK	447	*/
	448	return 0;
	449	}
	450
	451	if (ret < 0)
	452	return ret;
	453
	454	line = strchr(prop_buf, '\n');
	455	if (line)
	456	*line = 0;
	457
	458	return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
	459	pwr_attr->prop_name, prop_buf);
	460	}
	461
23680f0b	462	int power_supply_uevent(const struct device dev, struct kobj_uevent_env env)
4a11b59d	463	{
23680f0b	464	const struct power_supply *psy = dev_get_drvdata(dev);
27a2195e SR	465	const enum power_supply_property *battery_props =
	466	power_supply_battery_info_properties;
	467	unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
	468	sizeof(unsigned long) + 1] = {0};
7eff2e7a	469	int ret = 0, j;
4a11b59d	470	char *prop_buf;
4a11b59d	471
297d716f	472	if (!psy \|\| !psy->desc) {
4a11b59d AV	473	dev_dbg(dev, "No power supply yet\n");
	474	return ret;
	475	}
	476
297d716f	477	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
4a11b59d AV	478	if (ret)
	479	return ret;
	480
3dc0bab2 SR	481	/*
	482	* Kernel generates KOBJ_REMOVE uevent in device removal path, after
	483	* resources have been freed. Exit early to avoid use-after-free.
	484	*/
	485	if (psy->removing)
	486	return 0;
	487
4a11b59d AV	488	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
	489	if (!prop_buf)
	490	return -ENOMEM;
	491
2ad3d74e MK	492	ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
	493	if (ret)
	494	goto out;
4a11b59d	495
2ad3d74e	496	for (j = 0; j < psy->desc->num_properties; j++) {
27a2195e	497	set_bit(psy->desc->properties[j], psy_drv_properties);
2ad3d74e MK	498	ret = add_prop_uevent(dev, env, psy->desc->properties[j],
2ad3d74e MK	499	prop_buf);
4a11b59d AV	500	if (ret)
	501	goto out;
	502	}
	503
27a2195e SR	504	for (j = 0; j < power_supply_battery_info_properties_size; j++) {
	505	if (test_bit(battery_props[j], psy_drv_properties))
	506	continue;
	507	if (!power_supply_battery_info_has_prop(psy->battery_info,
	508	battery_props[j]))
	509	continue;
	510	ret = add_prop_uevent(dev, env, battery_props[j],
	511	prop_buf);
	512	if (ret)
	513	goto out;
	514	}
	515
4a11b59d AV	516	out:
	517	free_page((unsigned long)prop_buf);
	518
	519	return ret;
	520	}
539b9c94 TW	521
	522	ssize_t power_supply_charge_behaviour_show(struct device *dev,
	523	unsigned int available_behaviours,
	524	enum power_supply_charge_behaviour current_behaviour,
	525	char *buf)
	526	{
	527	bool match = false, available, active;
	528	ssize_t count = 0;
	529	int i;
	530
	531	for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
	532	available = available_behaviours & BIT(i);
	533	active = i == current_behaviour;
	534
	535	if (available && active) {
	536	count += sysfs_emit_at(buf, count, "[%s] ",
	537	POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
	538	match = true;
	539	} else if (available) {
	540	count += sysfs_emit_at(buf, count, "%s ",
	541	POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
	542	}
	543	}
	544
	545	if (!match) {
	546	dev_warn(dev, "driver reporting unsupported charge behaviour\n");
	547	return -EINVAL;
	548	}
	549
	550	if (count)
	551	buf[count - 1] = '\n';
	552
	553	return count;
	554	}
	555	EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
	556
	557	int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
	558	{
	559	int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
	560
	561	if (i < 0)
	562	return i;
	563
	564	if (available_behaviours & BIT(i))
	565	return i;
	566
	567	return -EINVAL;
	568	}
	569	EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);