2 * Sysfs interface for the universal power supply monitor class
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>
9 * Modified: 2004, Oct Szabolcs Gyurko
11 * You may use this code as per GPL version 2
14 #include <linux/ctype.h>
15 #include <linux/power_supply.h>
16 #include <linux/slab.h>
17 #include <linux/stat.h>
19 #include "power_supply.h"
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.
26 * The source of this definition is the device.h which calls __ATTR
27 * macro in sysfs.h which calls the __stringify macro.
29 * Only modification that the name is not tried to be resolved
30 * (as a macro let's say).
33 #define POWER_SUPPLY_ATTR(_name) \
35 .attr = { .name = #_name }, \
36 .show = power_supply_show_property, \
37 .store = power_supply_store_property, \
40 static struct device_attribute power_supply_attrs[];
42 static ssize_t power_supply_show_property(struct device *dev,
43 struct device_attribute *attr,
45 static char *type_text[] = {
46 "Battery", "UPS", "Mains", "USB",
47 "USB_DCP", "USB_CDP", "USB_ACA"
49 static char *status_text[] = {
50 "Unknown", "Charging", "Discharging", "Not charging", "Full"
52 static char *charge_type[] = {
53 "Unknown", "N/A", "Trickle", "Fast"
55 static char *health_text[] = {
56 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
57 "Unspecified failure", "Cold",
59 static char *technology_text[] = {
60 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
63 static char *capacity_level_text[] = {
64 "Unknown", "Critical", "Low", "Normal", "High", "Full"
67 struct power_supply *psy = dev_get_drvdata(dev);
68 const ptrdiff_t off = attr - power_supply_attrs;
69 union power_supply_propval value;
71 if (off == POWER_SUPPLY_PROP_TYPE)
72 value.intval = psy->type;
74 ret = psy->get_property(psy, off, &value);
78 dev_dbg(dev, "driver has no data for `%s' property\n",
80 else if (ret != -ENODEV)
81 dev_err(dev, "driver failed to report `%s' property\n",
86 if (off == POWER_SUPPLY_PROP_STATUS)
87 return sprintf(buf, "%s\n", status_text[value.intval]);
88 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
89 return sprintf(buf, "%s\n", charge_type[value.intval]);
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]);
94 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
95 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
96 else if (off == POWER_SUPPLY_PROP_TYPE)
97 return sprintf(buf, "%s\n", type_text[value.intval]);
98 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
99 return sprintf(buf, "%s\n", value.strval);
101 return sprintf(buf, "%d\n", value.intval);
104 static ssize_t power_supply_store_property(struct device *dev,
105 struct device_attribute *attr,
106 const char *buf, size_t count) {
108 struct power_supply *psy = dev_get_drvdata(dev);
109 const ptrdiff_t off = attr - power_supply_attrs;
110 union power_supply_propval value;
113 /* TODO: support other types than int */
114 ret = strict_strtol(buf, 10, &long_val);
118 value.intval = long_val;
120 ret = psy->set_property(psy, off, &value);
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),
131 POWER_SUPPLY_ATTR(charge_type),
132 POWER_SUPPLY_ATTR(health),
133 POWER_SUPPLY_ATTR(present),
134 POWER_SUPPLY_ATTR(online),
135 POWER_SUPPLY_ATTR(technology),
136 POWER_SUPPLY_ATTR(cycle_count),
137 POWER_SUPPLY_ATTR(voltage_max),
138 POWER_SUPPLY_ATTR(voltage_min),
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),
143 POWER_SUPPLY_ATTR(current_max),
144 POWER_SUPPLY_ATTR(current_now),
145 POWER_SUPPLY_ATTR(current_avg),
146 POWER_SUPPLY_ATTR(power_now),
147 POWER_SUPPLY_ATTR(power_avg),
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),
154 POWER_SUPPLY_ATTR(charge_counter),
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),
162 POWER_SUPPLY_ATTR(capacity_level),
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),
169 POWER_SUPPLY_ATTR(type),
170 /* Properties of type `const char *' */
171 POWER_SUPPLY_ATTR(model_name),
172 POWER_SUPPLY_ATTR(manufacturer),
173 POWER_SUPPLY_ATTR(serial_number),
176 static struct attribute *
177 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
179 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
180 struct attribute *attr,
183 struct device *dev = container_of(kobj, struct device, kobj);
184 struct power_supply *psy = dev_get_drvdata(dev);
185 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
188 if (attrno == POWER_SUPPLY_PROP_TYPE)
191 for (i = 0; i < psy->num_properties; i++) {
192 int property = psy->properties[i];
194 if (property == attrno) {
195 if (psy->property_is_writeable &&
196 psy->property_is_writeable(psy, property) > 0)
206 static struct attribute_group power_supply_attr_group = {
207 .attrs = __power_supply_attrs,
208 .is_visible = power_supply_attr_is_visible,
211 static const struct attribute_group *power_supply_attr_groups[] = {
212 &power_supply_attr_group,
216 void power_supply_init_attrs(struct device_type *dev_type)
220 dev_type->groups = power_supply_attr_groups;
222 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
223 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
226 static char *kstruprdup(const char *str, gfp_t gfp)
230 ustr = ret = kmalloc(strlen(str) + 1, gfp);
236 *ustr++ = toupper(*str++);
243 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
245 struct power_supply *psy = dev_get_drvdata(dev);
250 dev_dbg(dev, "uevent\n");
252 if (!psy || !psy->dev) {
253 dev_dbg(dev, "No power supply yet\n");
257 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
259 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
263 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
267 for (j = 0; j < psy->num_properties; j++) {
268 struct device_attribute *attr;
271 attr = &power_supply_attrs[psy->properties[j]];
273 ret = power_supply_show_property(dev, attr, prop_buf);
274 if (ret == -ENODEV || ret == -ENODATA) {
275 /* When a battery is absent, we expect -ENODEV. Don't abort;
276 send the uevent with at least the the PRESENT=0 property */
284 line = strchr(prop_buf, '\n');
288 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
294 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
296 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
303 free_page((unsigned long)prop_buf);