[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, .mode = 0444 },	\
	.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 *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;
	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 == -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_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(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),
	/* Properties of type `const char *' */
	POWER_SUPPLY_ATTR(model_name),
	POWER_SUPPLY_ATTR(manufacturer),
	POWER_SUPPLY_ATTR(serial_number),
};

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[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 || !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 < 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>
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	{ \
01e8ef11	34	.attr = { .name = #_name, .mode = 0444 }, \
4a11b59d AV	35	.show = power_supply_show_property, \
	36	.store = NULL, \
	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) {
	44	static char *status_text[] = {
	45	"Unknown", "Charging", "Discharging", "Not charging", "Full"
	46	};
ee8076ed AS	47	static char *charge_type[] = {
	48	"Unknown", "N/A", "Trickle", "Fast"
	49	};
4a11b59d AV	50	static char *health_text[] = {
4a11b59d AV	51	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
7e386e6e	52	"Unspecified failure", "Cold",
4a11b59d AV	53	};
4a11b59d AV	54	static char *technology_text[] = {
c7cc930f DES	55	"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
c7cc930f DES	56	"LiMn"
4a11b59d	57	};
b294a290 AS	58	static char *capacity_level_text[] = {
	59	"Unknown", "Critical", "Low", "Normal", "High", "Full"
	60	};
4a11b59d AV	61	ssize_t ret;
	62	struct power_supply *psy = dev_get_drvdata(dev);
	63	const ptrdiff_t off = attr - power_supply_attrs;
	64	union power_supply_propval value;
	65
	66	ret = psy->get_property(psy, off, &value);
	67
	68	if (ret < 0) {
9d233e8b AV	69	if (ret == -ENODATA)
	70	dev_dbg(dev, "driver has no data for `%s' property\n",
	71	attr->attr.name);
	72	else if (ret != -ENODEV)
4a11b59d AV	73	dev_err(dev, "driver failed to report `%s' property\n",
	74	attr->attr.name);
	75	return ret;
	76	}
	77
	78	if (off == POWER_SUPPLY_PROP_STATUS)
	79	return sprintf(buf, "%s\n", status_text[value.intval]);
ee8076ed AS	80	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
ee8076ed AS	81	return sprintf(buf, "%s\n", charge_type[value.intval]);
4a11b59d AV	82	else if (off == POWER_SUPPLY_PROP_HEALTH)
	83	return sprintf(buf, "%s\n", health_text[value.intval]);
	84	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
	85	return sprintf(buf, "%s\n", technology_text[value.intval]);
b294a290 AS	86	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
b294a290 AS	87	return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
4a11b59d AV	88	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
	89	return sprintf(buf, "%s\n", value.strval);
	90
	91	return sprintf(buf, "%d\n", value.intval);
	92	}
	93
	94	/* Must be in the same order as POWER_SUPPLY_PROP_* */
	95	static struct device_attribute power_supply_attrs[] = {
	96	/* Properties of type `int' */
	97	POWER_SUPPLY_ATTR(status),
ee8076ed	98	POWER_SUPPLY_ATTR(charge_type),
4a11b59d AV	99	POWER_SUPPLY_ATTR(health),
	100	POWER_SUPPLY_ATTR(present),
	101	POWER_SUPPLY_ATTR(online),
	102	POWER_SUPPLY_ATTR(technology),
c955fe8e	103	POWER_SUPPLY_ATTR(cycle_count),
c7cc930f DES	104	POWER_SUPPLY_ATTR(voltage_max),
c7cc930f DES	105	POWER_SUPPLY_ATTR(voltage_min),
4a11b59d AV	106	POWER_SUPPLY_ATTR(voltage_max_design),
	107	POWER_SUPPLY_ATTR(voltage_min_design),
	108	POWER_SUPPLY_ATTR(voltage_now),
	109	POWER_SUPPLY_ATTR(voltage_avg),
	110	POWER_SUPPLY_ATTR(current_now),
	111	POWER_SUPPLY_ATTR(current_avg),
7faa144a AS	112	POWER_SUPPLY_ATTR(power_now),
7faa144a AS	113	POWER_SUPPLY_ATTR(power_avg),
4a11b59d AV	114	POWER_SUPPLY_ATTR(charge_full_design),
	115	POWER_SUPPLY_ATTR(charge_empty_design),
	116	POWER_SUPPLY_ATTR(charge_full),
	117	POWER_SUPPLY_ATTR(charge_empty),
	118	POWER_SUPPLY_ATTR(charge_now),
	119	POWER_SUPPLY_ATTR(charge_avg),
8e552c36	120	POWER_SUPPLY_ATTR(charge_counter),
4a11b59d AV	121	POWER_SUPPLY_ATTR(energy_full_design),
	122	POWER_SUPPLY_ATTR(energy_empty_design),
	123	POWER_SUPPLY_ATTR(energy_full),
	124	POWER_SUPPLY_ATTR(energy_empty),
	125	POWER_SUPPLY_ATTR(energy_now),
	126	POWER_SUPPLY_ATTR(energy_avg),
	127	POWER_SUPPLY_ATTR(capacity),
b294a290	128	POWER_SUPPLY_ATTR(capacity_level),
4a11b59d AV	129	POWER_SUPPLY_ATTR(temp),
	130	POWER_SUPPLY_ATTR(temp_ambient),
	131	POWER_SUPPLY_ATTR(time_to_empty_now),
	132	POWER_SUPPLY_ATTR(time_to_empty_avg),
	133	POWER_SUPPLY_ATTR(time_to_full_now),
	134	POWER_SUPPLY_ATTR(time_to_full_avg),
	135	/* Properties of type `const char ' /
	136	POWER_SUPPLY_ATTR(model_name),
	137	POWER_SUPPLY_ATTR(manufacturer),
7c2670bb	138	POWER_SUPPLY_ATTR(serial_number),
4a11b59d AV	139	};
	140
	141	static ssize_t power_supply_show_static_attrs(struct device *dev,
	142	struct device_attribute *attr,
	143	char *buf) {
	144	static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
	145	struct power_supply *psy = dev_get_drvdata(dev);
	146
	147	return sprintf(buf, "%s\n", type_text[psy->type]);
	148	}
	149
	150	static struct device_attribute power_supply_static_attrs[] = {
	151	__ATTR(type, 0444, power_supply_show_static_attrs, NULL),
	152	};
	153
	154	int power_supply_create_attrs(struct power_supply *psy)
	155	{
	156	int rc = 0;
	157	int i, j;
	158
	159	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
	160	rc = device_create_file(psy->dev,
	161	&power_supply_static_attrs[i]);
	162	if (rc)
	163	goto statics_failed;
	164	}
	165
	166	for (j = 0; j < psy->num_properties; j++) {
	167	rc = device_create_file(psy->dev,
	168	&power_supply_attrs[psy->properties[j]]);
	169	if (rc)
	170	goto dynamics_failed;
	171	}
	172
	173	goto succeed;
	174
	175	dynamics_failed:
	176	while (j--)
	177	device_remove_file(psy->dev,
	178	&power_supply_attrs[psy->properties[j]]);
	179	statics_failed:
	180	while (i--)
839dc9f1	181	device_remove_file(psy->dev, &power_supply_static_attrs[i]);
4a11b59d AV	182	succeed:
	183	return rc;
	184	}
	185
	186	void power_supply_remove_attrs(struct power_supply *psy)
	187	{
	188	int i;
	189
	190	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
839dc9f1	191	device_remove_file(psy->dev, &power_supply_static_attrs[i]);
4a11b59d AV	192
	193	for (i = 0; i < psy->num_properties; i++)
	194	device_remove_file(psy->dev,
	195	&power_supply_attrs[psy->properties[i]]);
4a11b59d AV	196	}
	197
	198	static char kstruprdup(const char str, gfp_t gfp)
	199	{
	200	char ret, ustr;
	201
	202	ustr = ret = kmalloc(strlen(str) + 1, gfp);
	203
	204	if (!ret)
	205	return NULL;
	206
	207	while (*str)
	208	ustr++ = toupper(str++);
	209
	210	*ustr = 0;
	211
	212	return ret;
	213	}
	214
7eff2e7a	215	int power_supply_uevent(struct device dev, struct kobj_uevent_env env)
4a11b59d AV	216	{
4a11b59d AV	217	struct power_supply *psy = dev_get_drvdata(dev);
7eff2e7a	218	int ret = 0, j;
4a11b59d AV	219	char *prop_buf;
	220	char *attrname;
	221
	222	dev_dbg(dev, "uevent\n");
	223
56fa18e8	224	if (!psy \|\| !psy->dev) {
4a11b59d AV	225	dev_dbg(dev, "No power supply yet\n");
	226	return ret;
	227	}
	228
	229	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
	230
7eff2e7a	231	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
4a11b59d AV	232	if (ret)
	233	return ret;
	234
	235	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
	236	if (!prop_buf)
	237	return -ENOMEM;
	238
	239	for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
	240	struct device_attribute *attr;
	241	char *line;
	242
	243	attr = &power_supply_static_attrs[j];
	244
	245	ret = power_supply_show_static_attrs(dev, attr, prop_buf);
	246	if (ret < 0)
	247	goto out;
	248
	249	line = strchr(prop_buf, '\n');
	250	if (line)
	251	*line = 0;
	252
	253	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	254	if (!attrname) {
	255	ret = -ENOMEM;
	256	goto out;
	257	}
	258
	259	dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
	260
7eff2e7a	261	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	262	kfree(attrname);
	263	if (ret)
	264	goto out;
	265	}
	266
	267	dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
	268
	269	for (j = 0; j < psy->num_properties; j++) {
	270	struct device_attribute *attr;
	271	char *line;
	272
	273	attr = &power_supply_attrs[psy->properties[j]];
	274
	275	ret = power_supply_show_property(dev, attr, prop_buf);
	276	if (ret == -ENODEV) {
	277	/* When a battery is absent, we expect -ENODEV. Don't abort;
	278	send the uevent with at least the the PRESENT=0 property */
	279	ret = 0;
	280	continue;
	281	}
	282
	283	if (ret < 0)
	284	goto out;
	285
	286	line = strchr(prop_buf, '\n');
	287	if (line)
	288	*line = 0;
	289
	290	attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
	291	if (!attrname) {
	292	ret = -ENOMEM;
	293	goto out;
	294	}
	295
	296	dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
	297
7eff2e7a	298	ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
4a11b59d AV	299	kfree(attrname);
	300	if (ret)
	301	goto out;
	302	}
	303
	304	out:
	305	free_page((unsigned long)prop_buf);
	306
	307	return ret;
	308	}