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>
18 #include "power_supply.h"
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.
25 * The source of this definition is the device.h which calls __ATTR
26 * macro in sysfs.h which calls the __stringify macro.
28 * Only modification that the name is not tried to be resolved
29 * (as a macro let's say).
32 #define POWER_SUPPLY_ATTR(_name) \
34 .attr = { .name = #_name, .mode = 0444 }, \
35 .show = power_supply_show_property, \
39 static struct device_attribute power_supply_attrs[];
41 static ssize_t power_supply_show_property(struct device *dev,
42 struct device_attribute *attr,
44 static char *status_text[] = {
45 "Unknown", "Charging", "Discharging", "Not charging", "Full"
47 static char *charge_type[] = {
48 "Unknown", "N/A", "Trickle", "Fast"
50 static char *health_text[] = {
51 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
52 "Unspecified failure", "Cold",
54 static char *technology_text[] = {
55 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
58 static char *capacity_level_text[] = {
59 "Unknown", "Critical", "Low", "Normal", "High", "Full"
62 struct power_supply *psy = dev_get_drvdata(dev);
63 const ptrdiff_t off = attr - power_supply_attrs;
64 union power_supply_propval value;
66 ret = psy->get_property(psy, off, &value);
70 dev_dbg(dev, "driver has no data for `%s' property\n",
72 else if (ret != -ENODEV)
73 dev_err(dev, "driver failed to report `%s' property\n",
78 if (off == POWER_SUPPLY_PROP_STATUS)
79 return sprintf(buf, "%s\n", status_text[value.intval]);
80 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
81 return sprintf(buf, "%s\n", charge_type[value.intval]);
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]);
86 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
87 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
88 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
89 return sprintf(buf, "%s\n", value.strval);
91 return sprintf(buf, "%d\n", value.intval);
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),
98 POWER_SUPPLY_ATTR(charge_type),
99 POWER_SUPPLY_ATTR(health),
100 POWER_SUPPLY_ATTR(present),
101 POWER_SUPPLY_ATTR(online),
102 POWER_SUPPLY_ATTR(technology),
103 POWER_SUPPLY_ATTR(cycle_count),
104 POWER_SUPPLY_ATTR(voltage_max),
105 POWER_SUPPLY_ATTR(voltage_min),
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),
112 POWER_SUPPLY_ATTR(power_now),
113 POWER_SUPPLY_ATTR(power_avg),
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),
120 POWER_SUPPLY_ATTR(charge_counter),
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),
128 POWER_SUPPLY_ATTR(capacity_level),
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),
138 POWER_SUPPLY_ATTR(serial_number),
141 static ssize_t power_supply_show_static_attrs(struct device *dev,
142 struct device_attribute *attr,
144 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
145 struct power_supply *psy = dev_get_drvdata(dev);
147 return sprintf(buf, "%s\n", type_text[psy->type]);
150 static struct device_attribute power_supply_static_attrs[] = {
151 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
154 int power_supply_create_attrs(struct power_supply *psy)
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]);
166 for (j = 0; j < psy->num_properties; j++) {
167 rc = device_create_file(psy->dev,
168 &power_supply_attrs[psy->properties[j]]);
170 goto dynamics_failed;
177 device_remove_file(psy->dev,
178 &power_supply_attrs[psy->properties[j]]);
181 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
186 void power_supply_remove_attrs(struct power_supply *psy)
190 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
191 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
193 for (i = 0; i < psy->num_properties; i++)
194 device_remove_file(psy->dev,
195 &power_supply_attrs[psy->properties[i]]);
198 static char *kstruprdup(const char *str, gfp_t gfp)
202 ustr = ret = kmalloc(strlen(str) + 1, gfp);
208 *ustr++ = toupper(*str++);
215 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
217 struct power_supply *psy = dev_get_drvdata(dev);
222 dev_dbg(dev, "uevent\n");
224 if (!psy || !psy->dev) {
225 dev_dbg(dev, "No power supply yet\n");
229 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
231 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
235 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
239 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
240 struct device_attribute *attr;
243 attr = &power_supply_static_attrs[j];
245 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
249 line = strchr(prop_buf, '\n');
253 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
259 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
261 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
267 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
269 for (j = 0; j < psy->num_properties; j++) {
270 struct device_attribute *attr;
273 attr = &power_supply_attrs[psy->properties[j]];
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 */
286 line = strchr(prop_buf, '\n');
290 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
296 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
298 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
305 free_page((unsigned long)prop_buf);