[linux.git] / drivers / power / power_supply_sysfs.c

/*
 *  Sysfs interface for the universal power supply monitor class
 *
 *  Copyright © 2007  David Woodhouse <[email protected]>
 *  Copyright © 2007  Anton Vorontsov <[email protected]>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <[email protected]>
 *
 *  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",
	};
	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\n",
				attr->attr.name);
		else if (ret != -ENODEV)
			dev_err(dev, "driver failed to report `%s' property: %zd\n",
				attr->attr.name, ret);
		return ret;
	}

	if (off == POWER_SUPPLY_PROP_STATUS)
		return sprintf(buf, "%s\n", status_text[value.intval]);
	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
		return sprintf(buf, "%s\n", charge_type[value.intval]);
	else if (off == POWER_SUPPLY_PROP_HEALTH)
		return sprintf(buf, "%s\n", health_text[value.intval]);
	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
		return sprintf(buf, "%s\n", technology_text[value.intval]);
	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
		return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
	else if (off == POWER_SUPPLY_PROP_TYPE)
		return sprintf(buf, "%s\n", type_text[value.intval]);
	else if (off == POWER_SUPPLY_PROP_SCOPE)
		return sprintf(buf, "%s\n", scope_text[value.intval]);
	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
		return sprintf(buf, "%s\n", value.strval);

	return sprintf(buf, "%d\n", 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 = strict_strtol(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(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\n");

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

	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", 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, '\n');
		if (line)
			*line = 0;

		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
		if (!attrname) {
			ret = -ENOMEM;
			goto out;
		}

		dev_dbg(dev, "prop %s=%s\n", 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;
}
Commit	Line	Data
4a11b59d AV	1	/*
	2	* Sysfs interface for the universal power supply monitor class
	3	*
	4	* Copyright © 2007 David Woodhouse <[email protected]>
	5	* Copyright © 2007 Anton Vorontsov <[email protected]>
	6	* Copyright © 2004 Szabolcs Gyurko
	7	* Copyright © 2003 Ian Molton <[email protected]>
	8	*
	9	* Modified: 2004, Oct Szabolcs Gyurko
	10	*
	11	* You may use this code as per GPL version 2
	12	*/
	13
	14	#include <linux/ctype.h>
51990e82	15	#include <linux/device.h>
4a11b59d	16	#include <linux/power_supply.h>
5a0e3ad6	17	#include <linux/slab.h>
778f523d	18	#include <linux/stat.h>
4a11b59d	19
25f12141 AB	20	#include "power_supply.h"
25f12141 AB	21
4a11b59d AV	22	/*
	23	* This is because the name "current" breaks the device attr macro.
	24	* The "current" word resolves to "(get_current())" so instead of
	25	* "current" "(get_current())" appears in the sysfs.
	26	*
	27	* The source of this definition is the device.h which calls __ATTR
	28	* macro in sysfs.h which calls the __stringify macro.
	29	*
	30	* Only modification that the name is not tried to be resolved
	31	* (as a macro let's say).
	32	*/
	33
	34	#define POWER_SUPPLY_ATTR(_name) \
	35	{ \
5f487cd3	36	.attr = { .name = #_name }, \
4a11b59d	37	.show = power_supply_show_property, \
0011d2d4	38	.store = power_supply_store_property, \
4a11b59d AV	39	}
	40
	41	static struct device_attribute power_supply_attrs[];
	42
	43	static ssize_t power_supply_show_property(struct device *dev,
	44	struct device_attribute *attr,
	45	char *buf) {
5f487cd3	46	static char *type_text[] = {
9b887227	47	"Unknown", "Battery", "UPS", "Mains", "USB",
85efc8a1	48	"USB_DCP", "USB_CDP", "USB_ACA"
5f487cd3	49	};
4a11b59d AV	50	static char *status_text[] = {
	51	"Unknown", "Charging", "Discharging", "Not charging", "Full"
	52	};
ee8076ed AS	53	static char *charge_type[] = {
	54	"Unknown", "N/A", "Trickle", "Fast"
	55	};
4a11b59d AV	56	static char *health_text[] = {
4a11b59d AV	57	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
7e386e6e	58	"Unspecified failure", "Cold",
4a11b59d AV	59	};
4a11b59d AV	60	static char *technology_text[] = {
c7cc930f DB	61	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
c7cc930f DB	62	"LiMn"
4a11b59d	63	};
b294a290 AS	64	static char *capacity_level_text[] = {
	65	"Unknown", "Critical", "Low", "Normal", "High", "Full"
	66	};
25a0bc2d JF	67	static char *scope_text[] = {
	68	"Unknown", "System", "Device"
	69	};
5f487cd3	70	ssize_t ret = 0;
4a11b59d AV	71	struct power_supply *psy = dev_get_drvdata(dev);
	72	const ptrdiff_t off = attr - power_supply_attrs;
	73	union power_supply_propval value;
	74
5f487cd3 AV	75	if (off == POWER_SUPPLY_PROP_TYPE)
	76	value.intval = psy->type;
	77	else
	78	ret = psy->get_property(psy, off, &value);
4a11b59d AV	79
4a11b59d AV	80	if (ret < 0) {
9d233e8b AV	81	if (ret == -ENODATA)
	82	dev_dbg(dev, "driver has no data for `%s' property\n",
	83	attr->attr.name);
	84	else if (ret != -ENODEV)
85b5fbf7	85	dev_err(dev, "driver failed to report `%s' property: %zd\n",
35c3ae5e	86	attr->attr.name, ret);
4a11b59d AV	87	return ret;
	88	}
	89
	90	if (off == POWER_SUPPLY_PROP_STATUS)
	91	return sprintf(buf, "%s\n", status_text[value.intval]);
ee8076ed AS	92	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
ee8076ed AS	93	return sprintf(buf, "%s\n", charge_type[value.intval]);
4a11b59d AV	94	else if (off == POWER_SUPPLY_PROP_HEALTH)
	95	return sprintf(buf, "%s\n", health_text[value.intval]);
	96	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
	97	return sprintf(buf, "%s\n", technology_text[value.intval]);
b294a290 AS	98	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
b294a290 AS	99	return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
5f487cd3 AV	100	else if (off == POWER_SUPPLY_PROP_TYPE)
5f487cd3 AV	101	return sprintf(buf, "%s\n", type_text[value.intval]);
25a0bc2d JF	102	else if (off == POWER_SUPPLY_PROP_SCOPE)
25a0bc2d JF	103	return sprintf(buf, "%s\n", scope_text[value.intval]);
4a11b59d AV	104	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
	105	return sprintf(buf, "%s\n", value.strval);
	106
	107	return sprintf(buf, "%d\n", value.intval);
	108	}
	109
0011d2d4 DM	110	static ssize_t power_supply_store_property(struct device *dev,
	111	struct device_attribute *attr,
	112	const char *buf, size_t count) {
	113	ssize_t ret;
	114	struct power_supply *psy = dev_get_drvdata(dev);
	115	const ptrdiff_t off = attr - power_supply_attrs;
	116	union power_supply_propval value;
	117	long long_val;
	118
	119	/* TODO: support other types than int */
	120	ret = strict_strtol(buf, 10, &long_val);
	121	if (ret < 0)
	122	return ret;
	123
	124	value.intval = long_val;
	125
	126	ret = psy->set_property(psy, off, &value);
	127	if (ret < 0)
	128	return ret;
	129
	130	return count;
	131	}
	132
4a11b59d AV	133	/* Must be in the same order as POWER_SUPPLY_PROP_* */
	134	static struct device_attribute power_supply_attrs[] = {
	135	/* Properties of type `int' */
	136	POWER_SUPPLY_ATTR(status),
ee8076ed	137	POWER_SUPPLY_ATTR(charge_type),
4a11b59d AV	138	POWER_SUPPLY_ATTR(health),
	139	POWER_SUPPLY_ATTR(present),
	140	POWER_SUPPLY_ATTR(online),
b1b56872	141	POWER_SUPPLY_ATTR(authentic),
4a11b59d	142	POWER_SUPPLY_ATTR(technology),
c955fe8e	143	POWER_SUPPLY_ATTR(cycle_count),
c7cc930f DB	144	POWER_SUPPLY_ATTR(voltage_max),
c7cc930f DB	145	POWER_SUPPLY_ATTR(voltage_min),
4a11b59d AV	146	POWER_SUPPLY_ATTR(voltage_max_design),
	147	POWER_SUPPLY_ATTR(voltage_min_design),
	148	POWER_SUPPLY_ATTR(voltage_now),
	149	POWER_SUPPLY_ATTR(voltage_avg),
a2ebfe2f	150	POWER_SUPPLY_ATTR(voltage_ocv),
fe3f6d09	151	POWER_SUPPLY_ATTR(current_max),
4a11b59d AV	152	POWER_SUPPLY_ATTR(current_now),
4a11b59d AV	153	POWER_SUPPLY_ATTR(current_avg),
7faa144a AS	154	POWER_SUPPLY_ATTR(power_now),
7faa144a AS	155	POWER_SUPPLY_ATTR(power_avg),
4a11b59d AV	156	POWER_SUPPLY_ATTR(charge_full_design),
	157	POWER_SUPPLY_ATTR(charge_empty_design),
	158	POWER_SUPPLY_ATTR(charge_full),
	159	POWER_SUPPLY_ATTR(charge_empty),
	160	POWER_SUPPLY_ATTR(charge_now),
	161	POWER_SUPPLY_ATTR(charge_avg),
8e552c36	162	POWER_SUPPLY_ATTR(charge_counter),
3824c477	163	POWER_SUPPLY_ATTR(constant_charge_current),
2815b786	164	POWER_SUPPLY_ATTR(constant_charge_current_max),
3824c477	165	POWER_SUPPLY_ATTR(constant_charge_voltage),
2815b786	166	POWER_SUPPLY_ATTR(constant_charge_voltage_max),
4a11b59d AV	167	POWER_SUPPLY_ATTR(energy_full_design),
	168	POWER_SUPPLY_ATTR(energy_empty_design),
	169	POWER_SUPPLY_ATTR(energy_full),
	170	POWER_SUPPLY_ATTR(energy_empty),
	171	POWER_SUPPLY_ATTR(energy_now),
	172	POWER_SUPPLY_ATTR(energy_avg),
	173	POWER_SUPPLY_ATTR(capacity),
e908c418 RP	174	POWER_SUPPLY_ATTR(capacity_alert_min),
e908c418 RP	175	POWER_SUPPLY_ATTR(capacity_alert_max),
b294a290	176	POWER_SUPPLY_ATTR(capacity_level),
4a11b59d	177	POWER_SUPPLY_ATTR(temp),
e908c418 RP	178	POWER_SUPPLY_ATTR(temp_alert_min),
e908c418 RP	179	POWER_SUPPLY_ATTR(temp_alert_max),
4a11b59d	180	POWER_SUPPLY_ATTR(temp_ambient),
e908c418 RP	181	POWER_SUPPLY_ATTR(temp_ambient_alert_min),
e908c418 RP	182	POWER_SUPPLY_ATTR(temp_ambient_alert_max),
4a11b59d AV	183	POWER_SUPPLY_ATTR(time_to_empty_now),
	184	POWER_SUPPLY_ATTR(time_to_empty_avg),
	185	POWER_SUPPLY_ATTR(time_to_full_now),
	186	POWER_SUPPLY_ATTR(time_to_full_avg),
5f487cd3	187	POWER_SUPPLY_ATTR(type),
25a0bc2d	188	POWER_SUPPLY_ATTR(scope),
4a11b59d AV	189	/* Properties of type `const char ' /
	190	POWER_SUPPLY_ATTR(model_name),
	191	POWER_SUPPLY_ATTR(manufacturer),
7c2670bb	192	POWER_SUPPLY_ATTR(serial_number),
4a11b59d AV	193	};
4a11b59d AV	194
5f487cd3 AV	195	static struct attribute *
5f487cd3 AV	196	__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
4a11b59d	197
587a1f16	198	static umode_t power_supply_attr_is_visible(struct kobject *kobj,
5f487cd3 AV	199	struct attribute *attr,
5f487cd3 AV	200	int attrno)
4a11b59d	201	{
5f487cd3 AV	202	struct device *dev = container_of(kobj, struct device, kobj);
5f487cd3 AV	203	struct power_supply *psy = dev_get_drvdata(dev);
587a1f16	204	umode_t mode = S_IRUSR \| S_IRGRP \| S_IROTH;
5f487cd3	205	int i;
4a11b59d	206
bbabb158 DM	207	if (attrno == POWER_SUPPLY_PROP_TYPE)
	208	return mode;
	209
5f487cd3	210	for (i = 0; i < psy->num_properties; i++) {
0011d2d4 DM	211	int property = psy->properties[i];
	212
	213	if (property == attrno) {
0011d2d4 DM	214	if (psy->property_is_writeable &&
	215	psy->property_is_writeable(psy, property) > 0)
	216	mode \|= S_IWUSR;
	217
	218	return mode;
	219	}
4a11b59d AV	220	}
4a11b59d AV	221
5f487cd3	222	return 0;
4a11b59d AV	223	}
4a11b59d AV	224
5f487cd3 AV	225	static struct attribute_group power_supply_attr_group = {
	226	.attrs = __power_supply_attrs,
	227	.is_visible = power_supply_attr_is_visible,
	228	};
	229
	230	static const struct attribute_group *power_supply_attr_groups[] = {
	231	&power_supply_attr_group,
	232	NULL,
	233	};
	234
	235	void power_supply_init_attrs(struct device_type *dev_type)
4a11b59d AV	236	{
	237	int i;
	238
5f487cd3	239	dev_type->groups = power_supply_attr_groups;
4a11b59d	240
5f487cd3 AV	241	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
5f487cd3 AV	242	__power_supply_attrs[i] = &power_supply_attrs[i].attr;
4a11b59d AV	243	}
	244
	245	static char kstruprdup(const char str, gfp_t gfp)
	246	{
	247	char ret, ustr;
	248
	249	ustr = ret = kmalloc(strlen(str) + 1, gfp);
	250
	251	if (!ret)
	252	return NULL;
	253
	254	while (*str)
	255	ustr++ = toupper(str++);
	256
	257	*ustr = 0;
	258
	259	return ret;
	260	}
	261
7eff2e7a	262	int power_supply_uevent(struct device dev, struct kobj_uevent_env env)
4a11b59d AV	263	{
4a11b59d AV	264	struct power_supply *psy = dev_get_drvdata(dev);
7eff2e7a	265	int ret = 0, j;
4a11b59d AV	266	char *prop_buf;
	267	char *attrname;
	268
	269	dev_dbg(dev, "uevent\n");
	270
56fa18e8	271	if (!psy \|\| !psy->dev) {
4a11b59d AV	272	dev_dbg(dev, "No power supply yet\n");
	273	return ret;
	274	}
	275
	276	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
	277
7eff2e7a	278	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
4a11b59d AV	279	if (ret)
	280	return ret;
	281
	282	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
	283	if (!prop_buf)
	284	return -ENOMEM;
	285
4a11b59d AV	286	for (j = 0; j < psy->num_properties; j++) {
	287	struct device_attribute *attr;
	288	char *line;
	289
	290	attr = &power_supply_attrs[psy->properties[j]];
	291
	292	ret = power_supply_show_property(dev, attr, prop_buf);
f722e17f	293	if (ret == -ENODEV \|\| ret == -ENODATA) {
4a11b59d AV	294	/* When a battery is absent, we expect -ENODEV. Don't abort;
	295	send the uevent with at least the the PRESENT=0 property */
	296	ret = 0;
	297	continue;
	298	}
	299
	300	if (ret < 0)
	301	goto out;
	302
	303	line = strchr(prop_buf, '\n');
	304	if (line)
	305	*line = 0;
	306
	307	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	308	if (!attrname) {
	309	ret = -ENOMEM;
	310	goto out;
	311	}
	312
	313	dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
	314
7eff2e7a	315	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	316	kfree(attrname);
	317	if (ret)
	318	goto out;
	319	}
	320
	321	out:
	322	free_page((unsigned long)prop_buf);
	323
	324	return ret;
	325	}