[GitHub/mt8127/android_kernel_alcatel_ttab.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 <linux/slab.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[] = {
		"Battery", "UPS", "Mains", "USB"
	};
	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"
	};
	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\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_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_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(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(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(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),
	POWER_SUPPLY_ATTR(type),
	/* 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 mode_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);
	mode_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) {
			/* 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>
5a0e3ad6	16	#include <linux/slab.h>
4a11b59d	17
25f12141 AB	18	#include "power_supply.h"
25f12141 AB	19
4a11b59d AV	20	/*
	21	* This is because the name "current" breaks the device attr macro.
	22	* The "current" word resolves to "(get_current())" so instead of
	23	* "current" "(get_current())" appears in the sysfs.
	24	*
	25	* The source of this definition is the device.h which calls __ATTR
	26	* macro in sysfs.h which calls the __stringify macro.
	27	*
	28	* Only modification that the name is not tried to be resolved
	29	* (as a macro let's say).
	30	*/
	31
	32	#define POWER_SUPPLY_ATTR(_name) \
	33	{ \
5f487cd3	34	.attr = { .name = #_name }, \
4a11b59d	35	.show = power_supply_show_property, \
0011d2d4	36	.store = power_supply_store_property, \
4a11b59d AV	37	}
	38
	39	static struct device_attribute power_supply_attrs[];
	40
	41	static ssize_t power_supply_show_property(struct device *dev,
	42	struct device_attribute *attr,
	43	char *buf) {
5f487cd3 AV	44	static char *type_text[] = {
	45	"Battery", "UPS", "Mains", "USB"
	46	};
4a11b59d AV	47	static char *status_text[] = {
	48	"Unknown", "Charging", "Discharging", "Not charging", "Full"
	49	};
ee8076ed AS	50	static char *charge_type[] = {
	51	"Unknown", "N/A", "Trickle", "Fast"
	52	};
4a11b59d AV	53	static char *health_text[] = {
4a11b59d AV	54	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
7e386e6e	55	"Unspecified failure", "Cold",
4a11b59d AV	56	};
4a11b59d AV	57	static char *technology_text[] = {
c7cc930f DES	58	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
c7cc930f DES	59	"LiMn"
4a11b59d	60	};
b294a290 AS	61	static char *capacity_level_text[] = {
	62	"Unknown", "Critical", "Low", "Normal", "High", "Full"
	63	};
5f487cd3	64	ssize_t ret = 0;
4a11b59d AV	65	struct power_supply *psy = dev_get_drvdata(dev);
	66	const ptrdiff_t off = attr - power_supply_attrs;
	67	union power_supply_propval value;
	68
5f487cd3 AV	69	if (off == POWER_SUPPLY_PROP_TYPE)
	70	value.intval = psy->type;
	71	else
	72	ret = psy->get_property(psy, off, &value);
4a11b59d AV	73
4a11b59d AV	74	if (ret < 0) {
9d233e8b AV	75	if (ret == -ENODATA)
	76	dev_dbg(dev, "driver has no data for `%s' property\n",
	77	attr->attr.name);
	78	else if (ret != -ENODEV)
4a11b59d AV	79	dev_err(dev, "driver failed to report `%s' property\n",
	80	attr->attr.name);
	81	return ret;
	82	}
	83
	84	if (off == POWER_SUPPLY_PROP_STATUS)
	85	return sprintf(buf, "%s\n", status_text[value.intval]);
ee8076ed AS	86	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
ee8076ed AS	87	return sprintf(buf, "%s\n", charge_type[value.intval]);
4a11b59d AV	88	else if (off == POWER_SUPPLY_PROP_HEALTH)
	89	return sprintf(buf, "%s\n", health_text[value.intval]);
	90	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
	91	return sprintf(buf, "%s\n", technology_text[value.intval]);
b294a290 AS	92	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
b294a290 AS	93	return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
5f487cd3 AV	94	else if (off == POWER_SUPPLY_PROP_TYPE)
5f487cd3 AV	95	return sprintf(buf, "%s\n", type_text[value.intval]);
4a11b59d AV	96	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
	97	return sprintf(buf, "%s\n", value.strval);
	98
	99	return sprintf(buf, "%d\n", value.intval);
	100	}
	101
0011d2d4 DM	102	static ssize_t power_supply_store_property(struct device *dev,
	103	struct device_attribute *attr,
	104	const char *buf, size_t count) {
	105	ssize_t ret;
	106	struct power_supply *psy = dev_get_drvdata(dev);
	107	const ptrdiff_t off = attr - power_supply_attrs;
	108	union power_supply_propval value;
	109	long long_val;
	110
	111	/* TODO: support other types than int */
	112	ret = strict_strtol(buf, 10, &long_val);
	113	if (ret < 0)
	114	return ret;
	115
	116	value.intval = long_val;
	117
	118	ret = psy->set_property(psy, off, &value);
	119	if (ret < 0)
	120	return ret;
	121
	122	return count;
	123	}
	124
4a11b59d AV	125	/* Must be in the same order as POWER_SUPPLY_PROP_* */
	126	static struct device_attribute power_supply_attrs[] = {
	127	/* Properties of type `int' */
	128	POWER_SUPPLY_ATTR(status),
ee8076ed	129	POWER_SUPPLY_ATTR(charge_type),
4a11b59d AV	130	POWER_SUPPLY_ATTR(health),
	131	POWER_SUPPLY_ATTR(present),
	132	POWER_SUPPLY_ATTR(online),
	133	POWER_SUPPLY_ATTR(technology),
c955fe8e	134	POWER_SUPPLY_ATTR(cycle_count),
c7cc930f DES	135	POWER_SUPPLY_ATTR(voltage_max),
c7cc930f DES	136	POWER_SUPPLY_ATTR(voltage_min),
4a11b59d AV	137	POWER_SUPPLY_ATTR(voltage_max_design),
	138	POWER_SUPPLY_ATTR(voltage_min_design),
	139	POWER_SUPPLY_ATTR(voltage_now),
	140	POWER_SUPPLY_ATTR(voltage_avg),
	141	POWER_SUPPLY_ATTR(current_now),
	142	POWER_SUPPLY_ATTR(current_avg),
7faa144a AS	143	POWER_SUPPLY_ATTR(power_now),
7faa144a AS	144	POWER_SUPPLY_ATTR(power_avg),
4a11b59d AV	145	POWER_SUPPLY_ATTR(charge_full_design),
	146	POWER_SUPPLY_ATTR(charge_empty_design),
	147	POWER_SUPPLY_ATTR(charge_full),
	148	POWER_SUPPLY_ATTR(charge_empty),
	149	POWER_SUPPLY_ATTR(charge_now),
	150	POWER_SUPPLY_ATTR(charge_avg),
8e552c36	151	POWER_SUPPLY_ATTR(charge_counter),
4a11b59d AV	152	POWER_SUPPLY_ATTR(energy_full_design),
	153	POWER_SUPPLY_ATTR(energy_empty_design),
	154	POWER_SUPPLY_ATTR(energy_full),
	155	POWER_SUPPLY_ATTR(energy_empty),
	156	POWER_SUPPLY_ATTR(energy_now),
	157	POWER_SUPPLY_ATTR(energy_avg),
	158	POWER_SUPPLY_ATTR(capacity),
b294a290	159	POWER_SUPPLY_ATTR(capacity_level),
4a11b59d AV	160	POWER_SUPPLY_ATTR(temp),
	161	POWER_SUPPLY_ATTR(temp_ambient),
	162	POWER_SUPPLY_ATTR(time_to_empty_now),
	163	POWER_SUPPLY_ATTR(time_to_empty_avg),
	164	POWER_SUPPLY_ATTR(time_to_full_now),
	165	POWER_SUPPLY_ATTR(time_to_full_avg),
5f487cd3	166	POWER_SUPPLY_ATTR(type),
4a11b59d AV	167	/* Properties of type `const char ' /
	168	POWER_SUPPLY_ATTR(model_name),
	169	POWER_SUPPLY_ATTR(manufacturer),
7c2670bb	170	POWER_SUPPLY_ATTR(serial_number),
4a11b59d AV	171	};
4a11b59d AV	172
5f487cd3 AV	173	static struct attribute *
5f487cd3 AV	174	__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
4a11b59d	175
5f487cd3 AV	176	static mode_t power_supply_attr_is_visible(struct kobject *kobj,
	177	struct attribute *attr,
	178	int attrno)
4a11b59d	179	{
5f487cd3 AV	180	struct device *dev = container_of(kobj, struct device, kobj);
5f487cd3 AV	181	struct power_supply *psy = dev_get_drvdata(dev);
bbabb158	182	mode_t mode = S_IRUSR \| S_IRGRP \| S_IROTH;
5f487cd3	183	int i;
4a11b59d	184
bbabb158 DM	185	if (attrno == POWER_SUPPLY_PROP_TYPE)
	186	return mode;
	187
5f487cd3	188	for (i = 0; i < psy->num_properties; i++) {
0011d2d4 DM	189	int property = psy->properties[i];
	190
	191	if (property == attrno) {
0011d2d4 DM	192	if (psy->property_is_writeable &&
	193	psy->property_is_writeable(psy, property) > 0)
	194	mode \|= S_IWUSR;
	195
	196	return mode;
	197	}
4a11b59d AV	198	}
4a11b59d AV	199
5f487cd3	200	return 0;
4a11b59d AV	201	}
4a11b59d AV	202
5f487cd3 AV	203	static struct attribute_group power_supply_attr_group = {
	204	.attrs = __power_supply_attrs,
	205	.is_visible = power_supply_attr_is_visible,
	206	};
	207
	208	static const struct attribute_group *power_supply_attr_groups[] = {
	209	&power_supply_attr_group,
	210	NULL,
	211	};
	212
	213	void power_supply_init_attrs(struct device_type *dev_type)
4a11b59d AV	214	{
	215	int i;
	216
5f487cd3	217	dev_type->groups = power_supply_attr_groups;
4a11b59d	218
5f487cd3 AV	219	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
5f487cd3 AV	220	__power_supply_attrs[i] = &power_supply_attrs[i].attr;
4a11b59d AV	221	}
	222
	223	static char kstruprdup(const char str, gfp_t gfp)
	224	{
	225	char ret, ustr;
	226
	227	ustr = ret = kmalloc(strlen(str) + 1, gfp);
	228
	229	if (!ret)
	230	return NULL;
	231
	232	while (*str)
	233	ustr++ = toupper(str++);
	234
	235	*ustr = 0;
	236
	237	return ret;
	238	}
	239
7eff2e7a	240	int power_supply_uevent(struct device dev, struct kobj_uevent_env env)
4a11b59d AV	241	{
4a11b59d AV	242	struct power_supply *psy = dev_get_drvdata(dev);
7eff2e7a	243	int ret = 0, j;
4a11b59d AV	244	char *prop_buf;
	245	char *attrname;
	246
	247	dev_dbg(dev, "uevent\n");
	248
56fa18e8	249	if (!psy \|\| !psy->dev) {
4a11b59d AV	250	dev_dbg(dev, "No power supply yet\n");
	251	return ret;
	252	}
	253
	254	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
	255
7eff2e7a	256	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
4a11b59d AV	257	if (ret)
	258	return ret;
	259
	260	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
	261	if (!prop_buf)
	262	return -ENOMEM;
	263
4a11b59d AV	264	for (j = 0; j < psy->num_properties; j++) {
	265	struct device_attribute *attr;
	266	char *line;
	267
	268	attr = &power_supply_attrs[psy->properties[j]];
	269
	270	ret = power_supply_show_property(dev, attr, prop_buf);
	271	if (ret == -ENODEV) {
	272	/* When a battery is absent, we expect -ENODEV. Don't abort;
	273	send the uevent with at least the the PRESENT=0 property */
	274	ret = 0;
	275	continue;
	276	}
	277
	278	if (ret < 0)
	279	goto out;
	280
	281	line = strchr(prop_buf, '\n');
	282	if (line)
	283	*line = 0;
	284
	285	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	286	if (!attrname) {
	287	ret = -ENOMEM;
	288	goto out;
	289	}
	290
	291	dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
	292
7eff2e7a	293	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	294	kfree(attrname);
	295	if (ret)
	296	goto out;
	297	}
	298
	299	out:
	300	free_page((unsigned long)prop_buf);
	301
	302	return ret;
	303	}