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