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>
17 #include "power_supply.h"
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.
24 * The source of this definition is the device.h which calls __ATTR
25 * macro in sysfs.h which calls the __stringify macro.
27 * Only modification that the name is not tried to be resolved
28 * (as a macro let's say).
31 #define POWER_SUPPLY_ATTR(_name) \
33 .attr = { .name = #_name, .mode = 0444 }, \
34 .show = power_supply_show_property, \
38 static struct device_attribute power_supply_attrs[];
40 static ssize_t power_supply_show_property(struct device *dev,
41 struct device_attribute *attr,
43 static char *status_text[] = {
44 "Unknown", "Charging", "Discharging", "Not charging", "Full"
46 static char *charge_type[] = {
47 "Unknown", "N/A", "Trickle", "Fast"
49 static char *health_text[] = {
50 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
51 "Unspecified failure", "Cold",
53 static char *technology_text[] = {
54 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
57 static char *capacity_level_text[] = {
58 "Unknown", "Critical", "Low", "Normal", "High", "Full"
61 struct power_supply *psy = dev_get_drvdata(dev);
62 const ptrdiff_t off = attr - power_supply_attrs;
63 union power_supply_propval value;
65 ret = psy->get_property(psy, off, &value);
69 dev_dbg(dev, "driver has no data for `%s' property\n",
71 else if (ret != -ENODEV)
72 dev_err(dev, "driver failed to report `%s' property\n",
77 if (off == POWER_SUPPLY_PROP_STATUS)
78 return sprintf(buf, "%s\n", status_text[value.intval]);
79 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
80 return sprintf(buf, "%s\n", charge_type[value.intval]);
81 else if (off == POWER_SUPPLY_PROP_HEALTH)
82 return sprintf(buf, "%s\n", health_text[value.intval]);
83 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
84 return sprintf(buf, "%s\n", technology_text[value.intval]);
85 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
86 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
87 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
88 return sprintf(buf, "%s\n", value.strval);
90 return sprintf(buf, "%d\n", value.intval);
93 /* Must be in the same order as POWER_SUPPLY_PROP_* */
94 static struct device_attribute power_supply_attrs[] = {
95 /* Properties of type `int' */
96 POWER_SUPPLY_ATTR(status),
97 POWER_SUPPLY_ATTR(charge_type),
98 POWER_SUPPLY_ATTR(health),
99 POWER_SUPPLY_ATTR(present),
100 POWER_SUPPLY_ATTR(online),
101 POWER_SUPPLY_ATTR(technology),
102 POWER_SUPPLY_ATTR(cycle_count),
103 POWER_SUPPLY_ATTR(voltage_max),
104 POWER_SUPPLY_ATTR(voltage_min),
105 POWER_SUPPLY_ATTR(voltage_max_design),
106 POWER_SUPPLY_ATTR(voltage_min_design),
107 POWER_SUPPLY_ATTR(voltage_now),
108 POWER_SUPPLY_ATTR(voltage_avg),
109 POWER_SUPPLY_ATTR(current_now),
110 POWER_SUPPLY_ATTR(current_avg),
111 POWER_SUPPLY_ATTR(power_now),
112 POWER_SUPPLY_ATTR(power_avg),
113 POWER_SUPPLY_ATTR(charge_full_design),
114 POWER_SUPPLY_ATTR(charge_empty_design),
115 POWER_SUPPLY_ATTR(charge_full),
116 POWER_SUPPLY_ATTR(charge_empty),
117 POWER_SUPPLY_ATTR(charge_now),
118 POWER_SUPPLY_ATTR(charge_avg),
119 POWER_SUPPLY_ATTR(charge_counter),
120 POWER_SUPPLY_ATTR(energy_full_design),
121 POWER_SUPPLY_ATTR(energy_empty_design),
122 POWER_SUPPLY_ATTR(energy_full),
123 POWER_SUPPLY_ATTR(energy_empty),
124 POWER_SUPPLY_ATTR(energy_now),
125 POWER_SUPPLY_ATTR(energy_avg),
126 POWER_SUPPLY_ATTR(capacity),
127 POWER_SUPPLY_ATTR(capacity_level),
128 POWER_SUPPLY_ATTR(temp),
129 POWER_SUPPLY_ATTR(temp_ambient),
130 POWER_SUPPLY_ATTR(time_to_empty_now),
131 POWER_SUPPLY_ATTR(time_to_empty_avg),
132 POWER_SUPPLY_ATTR(time_to_full_now),
133 POWER_SUPPLY_ATTR(time_to_full_avg),
134 /* Properties of type `const char *' */
135 POWER_SUPPLY_ATTR(model_name),
136 POWER_SUPPLY_ATTR(manufacturer),
137 POWER_SUPPLY_ATTR(serial_number),
140 static ssize_t power_supply_show_static_attrs(struct device *dev,
141 struct device_attribute *attr,
143 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
144 struct power_supply *psy = dev_get_drvdata(dev);
146 return sprintf(buf, "%s\n", type_text[psy->type]);
149 static struct device_attribute power_supply_static_attrs[] = {
150 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
153 int power_supply_create_attrs(struct power_supply *psy)
158 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
159 rc = device_create_file(psy->dev,
160 &power_supply_static_attrs[i]);
165 for (j = 0; j < psy->num_properties; j++) {
166 rc = device_create_file(psy->dev,
167 &power_supply_attrs[psy->properties[j]]);
169 goto dynamics_failed;
176 device_remove_file(psy->dev,
177 &power_supply_attrs[psy->properties[j]]);
180 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
185 void power_supply_remove_attrs(struct power_supply *psy)
189 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
190 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
192 for (i = 0; i < psy->num_properties; i++)
193 device_remove_file(psy->dev,
194 &power_supply_attrs[psy->properties[i]]);
197 static char *kstruprdup(const char *str, gfp_t gfp)
201 ustr = ret = kmalloc(strlen(str) + 1, gfp);
207 *ustr++ = toupper(*str++);
214 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
216 struct power_supply *psy = dev_get_drvdata(dev);
221 dev_dbg(dev, "uevent\n");
223 if (!psy || !psy->dev) {
224 dev_dbg(dev, "No power supply yet\n");
228 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
230 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
234 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
238 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
239 struct device_attribute *attr;
242 attr = &power_supply_static_attrs[j];
244 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
248 line = strchr(prop_buf, '\n');
252 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
258 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
260 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
266 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
268 for (j = 0; j < psy->num_properties; j++) {
269 struct device_attribute *attr;
272 attr = &power_supply_attrs[psy->properties[j]];
274 ret = power_supply_show_property(dev, attr, prop_buf);
275 if (ret == -ENODEV) {
276 /* When a battery is absent, we expect -ENODEV. Don't abort;
277 send the uevent with at least the the PRESENT=0 property */
285 line = strchr(prop_buf, '\n');
289 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
295 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
297 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
304 free_page((unsigned long)prop_buf);