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