linux_dsm_epyc7002/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 "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;
};

#define POWER_SUPPLY_ATTR(_name)	\
[POWER_SUPPLY_PROP_ ## _name] =		\
{					\
	.prop_name = #_name,		\
	.attr_name = #_name "\0",	\
}

static const char * const power_supply_type_text[] = {
	"Unknown", "Battery", "UPS", "Mains", "USB",
	"USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
	"USB_PD", "USB_PD_DRP", "BrickID"
};

static const char * const power_supply_usb_type_text[] = {
	"Unknown", "SDP", "DCP", "CDP", "ACA", "C",
	"PD", "PD_DRP", "PD_PPS", "BrickID"
};

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

static const char * const power_supply_charge_type_text[] = {
	"Unknown", "N/A", "Trickle", "Fast", "Standard", "Adaptive", "Custom"
};

static const char * const power_supply_health_text[] = {
	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
	"Unspecified failure", "Cold", "Watchdog timer expire",
	"Safety timer expire", "Over current"
};

static const char * const power_supply_technology_text[] = {
	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
	"LiMn"
};

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

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

static struct power_supply_attr 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(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_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_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_ATTR(TYPE),
	POWER_SUPPLY_ATTR(USB_TYPE),
	POWER_SUPPLY_ATTR(SCOPE),
	POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
	POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
	POWER_SUPPLY_ATTR(CALIBRATE),
	/* 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 enum power_supply_property dev_attr_psp(struct device_attribute *attr)
{
	return container_of(attr, struct power_supply_attr, dev_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 += sprintf(buf + count, "[%s] ",
					 power_supply_usb_type_text[usb_type]);
			match = true;
		} else {
			count += sprintf(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);
	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(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_STATUS:
		ret = sprintf(buf, "%s\n",
			      power_supply_status_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = sprintf(buf, "%s\n",
			      power_supply_charge_type_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = sprintf(buf, "%s\n",
			      power_supply_health_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		ret = sprintf(buf, "%s\n",
			      power_supply_technology_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		ret = sprintf(buf, "%s\n",
			      power_supply_capacity_level_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_TYPE:
		ret = sprintf(buf, "%s\n",
			      power_supply_type_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_USB_TYPE:
		ret = power_supply_show_usb_type(dev, psy->desc,
						 &value, buf);
		break;
	case POWER_SUPPLY_PROP_SCOPE:
		ret = sprintf(buf, "%s\n",
			      power_supply_scope_text[value.intval]);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
		ret = sprintf(buf, "%s\n", value.strval);
		break;
	default:
		ret = sprintf(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);
	enum power_supply_property psp = dev_attr_psp(attr);
	union power_supply_propval value;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = sysfs_match_string(power_supply_status_text, buf);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = sysfs_match_string(power_supply_charge_type_text, buf);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = sysfs_match_string(power_supply_health_text, buf);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		ret = sysfs_match_string(power_supply_technology_text, buf);
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		ret = sysfs_match_string(power_supply_capacity_level_text, buf);
		break;
	case POWER_SUPPLY_PROP_SCOPE:
		ret = sysfs_match_string(power_supply_scope_text, buf);
		break;
	default:
		ret = -EINVAL;
	}

	/*
	 * 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 = 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 (!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;
		}
	}

	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,
};

static void str_to_lower(char *str)
{
	while (*str) {
		*str = tolower(*str);
		str++;
	}
}

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++) {
		struct device_attribute *attr;

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

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;

	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;

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

	for (j = 0; j < psy->desc->num_properties; j++) {
		struct power_supply_attr *pwr_attr;
		struct device_attribute *dev_attr;
		char *line;

		pwr_attr = &power_supply_attrs[psy->desc->properties[j]];
		dev_attr = &pwr_attr->dev_attr;

		ret = power_supply_show_property(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 the PRESENT=0 property */
			ret = 0;
			continue;
		}

		if (ret < 0)
			goto out;

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

		ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s",
				     pwr_attr->prop_name, prop_buf);
		if (ret)
			goto out;
	}

out:
	free_page((unsigned long)prop_buf);

	return ret;
}