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

/*
 *  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/power_supply.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, .mode = 0444, .owner = THIS_MODULE },	\
	.show = power_supply_show_property,				\
	.store = NULL,							\
}

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 *status_text[] = {
		"Unknown", "Charging", "Discharging", "Not charging", "Full"
	};
	static char *health_text[] = {
		"Unknown", "Good", "Overheat", "Dead", "Over voltage",
		"Unspecified failure"
	};
	static char *technology_text[] = {
		"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
	};
	ssize_t ret;
	struct power_supply *psy = dev_get_drvdata(dev);
	const ptrdiff_t off = attr - power_supply_attrs;
	union power_supply_propval value;

	ret = psy->get_property(psy, off, &value);

	if (ret < 0) {
		if (ret != -ENODEV)
			dev_err(dev, "driver failed to report `%s' property\n",
				attr->attr.name);
		return ret;
	}

	if (off == POWER_SUPPLY_PROP_STATUS)
		return sprintf(buf, "%s\n", status_text[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_MODEL_NAME)
		return sprintf(buf, "%s\n", value.strval);

	return sprintf(buf, "%d\n", value.intval);
}

/* 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(health),
	POWER_SUPPLY_ATTR(present),
	POWER_SUPPLY_ATTR(online),
	POWER_SUPPLY_ATTR(technology),
	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(current_now),
	POWER_SUPPLY_ATTR(current_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(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_level),
	POWER_SUPPLY_ATTR(temp),
	POWER_SUPPLY_ATTR(temp_ambient),
	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),
	/* Properties of type `const char *' */
	POWER_SUPPLY_ATTR(model_name),
	POWER_SUPPLY_ATTR(manufacturer),
};

static ssize_t power_supply_show_static_attrs(struct device *dev,
					      struct device_attribute *attr,
					      char *buf) {
	static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
	struct power_supply *psy = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", type_text[psy->type]);
}

static struct device_attribute power_supply_static_attrs[] = {
	__ATTR(type, 0444, power_supply_show_static_attrs, NULL),
};

int power_supply_create_attrs(struct power_supply *psy)
{
	int rc = 0;
	int i, j;

	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
		rc = device_create_file(psy->dev,
			    &power_supply_static_attrs[i]);
		if (rc)
			goto statics_failed;
	}

	for (j = 0; j < psy->num_properties; j++) {
		rc = device_create_file(psy->dev,
			    &power_supply_attrs[psy->properties[j]]);
		if (rc)
			goto dynamics_failed;
	}

	goto succeed;

dynamics_failed:
	while (j--)
		device_remove_file(psy->dev,
			   &power_supply_attrs[psy->properties[j]]);
statics_failed:
	while (i--)
		device_remove_file(psy->dev,
			   &power_supply_static_attrs[psy->properties[i]]);
succeed:
	return rc;
}

void power_supply_remove_attrs(struct power_supply *psy)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
		device_remove_file(psy->dev,
			    &power_supply_static_attrs[i]);

	for (i = 0; i < psy->num_properties; i++)
		device_remove_file(psy->dev,
			    &power_supply_attrs[psy->properties[i]]);
}

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) {
		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 < ARRAY_SIZE(power_supply_static_attrs); j++) {
		struct device_attribute *attr;
		char *line;

		attr = &power_supply_static_attrs[j];

		ret = power_supply_show_static_attrs(dev, attr, prop_buf);
		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, "Static 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;
	}

	dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);

	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) {
			/* 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 <dwmw2@infradead.org>
	5	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	6	* Copyright © 2004 Szabolcs Gyurko
	7	* Copyright © 2003 Ian Molton <spyro@f2s.com>
	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>
	15	#include <linux/power_supply.h>
	16
25f12141 AB	17	#include "power_supply.h"
25f12141 AB	18
4a11b59d AV	19	/*
	20	* This is because the name "current" breaks the device attr macro.
	21	* The "current" word resolves to "(get_current())" so instead of
	22	* "current" "(get_current())" appears in the sysfs.
	23	*
	24	* The source of this definition is the device.h which calls __ATTR
	25	* macro in sysfs.h which calls the __stringify macro.
	26	*
	27	* Only modification that the name is not tried to be resolved
	28	* (as a macro let's say).
	29	*/
	30
	31	#define POWER_SUPPLY_ATTR(_name) \
	32	{ \
	33	.attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
	34	.show = power_supply_show_property, \
	35	.store = NULL, \
	36	}
	37
	38	static struct device_attribute power_supply_attrs[];
	39
	40	static ssize_t power_supply_show_property(struct device *dev,
	41	struct device_attribute *attr,
	42	char *buf) {
	43	static char *status_text[] = {
	44	"Unknown", "Charging", "Discharging", "Not charging", "Full"
	45	};
	46	static char *health_text[] = {
	47	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
	48	"Unspecified failure"
	49	};
	50	static char *technology_text[] = {
	51	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
	52	};
4a11b59d AV	53	ssize_t ret;
	54	struct power_supply *psy = dev_get_drvdata(dev);
	55	const ptrdiff_t off = attr - power_supply_attrs;
	56	union power_supply_propval value;
	57
	58	ret = psy->get_property(psy, off, &value);
	59
	60	if (ret < 0) {
	61	if (ret != -ENODEV)
	62	dev_err(dev, "driver failed to report `%s' property\n",
	63	attr->attr.name);
	64	return ret;
	65	}
	66
	67	if (off == POWER_SUPPLY_PROP_STATUS)
	68	return sprintf(buf, "%s\n", status_text[value.intval]);
	69	else if (off == POWER_SUPPLY_PROP_HEALTH)
	70	return sprintf(buf, "%s\n", health_text[value.intval]);
	71	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
	72	return sprintf(buf, "%s\n", technology_text[value.intval]);
4a11b59d AV	73	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
	74	return sprintf(buf, "%s\n", value.strval);
	75
	76	return sprintf(buf, "%d\n", value.intval);
	77	}
	78
	79	/* Must be in the same order as POWER_SUPPLY_PROP_* */
	80	static struct device_attribute power_supply_attrs[] = {
	81	/* Properties of type `int' */
	82	POWER_SUPPLY_ATTR(status),
	83	POWER_SUPPLY_ATTR(health),
	84	POWER_SUPPLY_ATTR(present),
	85	POWER_SUPPLY_ATTR(online),
	86	POWER_SUPPLY_ATTR(technology),
	87	POWER_SUPPLY_ATTR(voltage_max_design),
	88	POWER_SUPPLY_ATTR(voltage_min_design),
	89	POWER_SUPPLY_ATTR(voltage_now),
	90	POWER_SUPPLY_ATTR(voltage_avg),
	91	POWER_SUPPLY_ATTR(current_now),
	92	POWER_SUPPLY_ATTR(current_avg),
	93	POWER_SUPPLY_ATTR(charge_full_design),
	94	POWER_SUPPLY_ATTR(charge_empty_design),
	95	POWER_SUPPLY_ATTR(charge_full),
	96	POWER_SUPPLY_ATTR(charge_empty),
	97	POWER_SUPPLY_ATTR(charge_now),
	98	POWER_SUPPLY_ATTR(charge_avg),
	99	POWER_SUPPLY_ATTR(energy_full_design),
	100	POWER_SUPPLY_ATTR(energy_empty_design),
	101	POWER_SUPPLY_ATTR(energy_full),
	102	POWER_SUPPLY_ATTR(energy_empty),
	103	POWER_SUPPLY_ATTR(energy_now),
	104	POWER_SUPPLY_ATTR(energy_avg),
	105	POWER_SUPPLY_ATTR(capacity),
	106	POWER_SUPPLY_ATTR(capacity_level),
	107	POWER_SUPPLY_ATTR(temp),
	108	POWER_SUPPLY_ATTR(temp_ambient),
	109	POWER_SUPPLY_ATTR(time_to_empty_now),
	110	POWER_SUPPLY_ATTR(time_to_empty_avg),
	111	POWER_SUPPLY_ATTR(time_to_full_now),
	112	POWER_SUPPLY_ATTR(time_to_full_avg),
	113	/* Properties of type `const char ' /
	114	POWER_SUPPLY_ATTR(model_name),
	115	POWER_SUPPLY_ATTR(manufacturer),
	116	};
	117
	118	static ssize_t power_supply_show_static_attrs(struct device *dev,
	119	struct device_attribute *attr,
	120	char *buf) {
	121	static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
	122	struct power_supply *psy = dev_get_drvdata(dev);
	123
	124	return sprintf(buf, "%s\n", type_text[psy->type]);
	125	}
	126
	127	static struct device_attribute power_supply_static_attrs[] = {
	128	__ATTR(type, 0444, power_supply_show_static_attrs, NULL),
	129	};
	130
	131	int power_supply_create_attrs(struct power_supply *psy)
	132	{
	133	int rc = 0;
	134	int i, j;
	135
	136	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
137	rc = device_create_file(psy->dev,
138	&power_supply_static_attrs[i]);
139	if (rc)
140	goto statics_failed;
141	}
142
143	for (j = 0; j < psy->num_properties; j++) {
144	rc = device_create_file(psy->dev,
145	&power_supply_attrs[psy->properties[j]]);
146	if (rc)
147	goto dynamics_failed;
148	}
149
150	goto succeed;
151
152	dynamics_failed:
153	while (j--)
154	device_remove_file(psy->dev,
155	&power_supply_attrs[psy->properties[j]]);
156	statics_failed:
157	while (i--)
158	device_remove_file(psy->dev,
159	&power_supply_static_attrs[psy->properties[i]]);
160	succeed:
161	return rc;
162	}
163
164	void power_supply_remove_attrs(struct power_supply *psy)
165	{
166	int i;
167
168	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
169	device_remove_file(psy->dev,
170	&power_supply_static_attrs[i]);
171
172	for (i = 0; i < psy->num_properties; i++)
173	device_remove_file(psy->dev,
174	&power_supply_attrs[psy->properties[i]]);
4a11b59d AV	175	}
	176
	177	static char kstruprdup(const char str, gfp_t gfp)
	178	{
	179	char ret, ustr;
	180
	181	ustr = ret = kmalloc(strlen(str) + 1, gfp);
	182
	183	if (!ret)
	184	return NULL;
	185
	186	while (*str)
	187	ustr++ = toupper(str++);
	188
	189	*ustr = 0;
	190
	191	return ret;
	192	}
	193
7eff2e7a	194	int power_supply_uevent(struct device dev, struct kobj_uevent_env env)
4a11b59d AV	195	{
4a11b59d AV	196	struct power_supply *psy = dev_get_drvdata(dev);
7eff2e7a	197	int ret = 0, j;
4a11b59d AV	198	char *prop_buf;
	199	char *attrname;
	200
	201	dev_dbg(dev, "uevent\n");
	202
	203	if (!psy) {
	204	dev_dbg(dev, "No power supply yet\n");
	205	return ret;
	206	}
	207
	208	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
	209
7eff2e7a	210	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
4a11b59d AV	211	if (ret)
	212	return ret;
	213
	214	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
	215	if (!prop_buf)
	216	return -ENOMEM;
	217
	218	for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
	219	struct device_attribute *attr;
	220	char *line;
	221
	222	attr = &power_supply_static_attrs[j];
	223
	224	ret = power_supply_show_static_attrs(dev, attr, prop_buf);
	225	if (ret < 0)
	226	goto out;
	227
	228	line = strchr(prop_buf, '\n');
	229	if (line)
	230	*line = 0;
	231
	232	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	233	if (!attrname) {
	234	ret = -ENOMEM;
	235	goto out;
	236	}
	237
	238	dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
	239
7eff2e7a	240	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	241	kfree(attrname);
	242	if (ret)
	243	goto out;
	244	}
	245
	246	dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
	247
	248	for (j = 0; j < psy->num_properties; j++) {
	249	struct device_attribute *attr;
	250	char *line;
	251
	252	attr = &power_supply_attrs[psy->properties[j]];
	253
	254	ret = power_supply_show_property(dev, attr, prop_buf);
	255	if (ret == -ENODEV) {
	256	/* When a battery is absent, we expect -ENODEV. Don't abort;
	257	send the uevent with at least the the PRESENT=0 property */
	258	ret = 0;
	259	continue;
	260	}
	261
	262	if (ret < 0)
	263	goto out;
	264
	265	line = strchr(prop_buf, '\n');
	266	if (line)
	267	*line = 0;
	268
	269	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	270	if (!attrname) {
	271	ret = -ENOMEM;
	272	goto out;
	273	}
	274
	275	dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
	276
7eff2e7a	277	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	278	kfree(attrname);
	279	if (ret)
	280	goto out;
	281	}
	282
	283	out:
	284	free_page((unsigned long)prop_buf);
	285
	286	return ret;
	287	}