[SLIP]: trivial sparse warning fix
[pohmelfs.git] / drivers / power / power_supply_sysfs.c
blobc7c4574729b190c6358e57e7f02d04427be3c029
1 /*
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>
18 * This is because the name "current" breaks the device attr macro.
19 * The "current" word resolves to "(get_current())" so instead of
20 * "current" "(get_current())" appears in the sysfs.
22 * The source of this definition is the device.h which calls __ATTR
23 * macro in sysfs.h which calls the __stringify macro.
25 * Only modification that the name is not tried to be resolved
26 * (as a macro let's say).
29 #define POWER_SUPPLY_ATTR(_name) \
30 { \
31 .attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
32 .show = power_supply_show_property, \
33 .store = NULL, \
36 static struct device_attribute power_supply_attrs[];
38 static ssize_t power_supply_show_property(struct device *dev,
39 struct device_attribute *attr,
40 char *buf) {
41 static char *status_text[] = {
42 "Unknown", "Charging", "Discharging", "Not charging", "Full"
44 static char *health_text[] = {
45 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
46 "Unspecified failure"
48 static char *technology_text[] = {
49 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
51 static char *capacity_level_text[] = {
52 "Unknown", "Critical", "Low", "Normal", "High", "Full"
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;
59 ret = psy->get_property(psy, off, &value);
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;
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]);
74 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
75 return sprintf(buf, "%s\n",
76 capacity_level_text[value.intval]);
77 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
78 return sprintf(buf, "%s\n", value.strval);
80 return sprintf(buf, "%d\n", value.intval);
83 /* Must be in the same order as POWER_SUPPLY_PROP_* */
84 static struct device_attribute power_supply_attrs[] = {
85 /* Properties of type `int' */
86 POWER_SUPPLY_ATTR(status),
87 POWER_SUPPLY_ATTR(health),
88 POWER_SUPPLY_ATTR(present),
89 POWER_SUPPLY_ATTR(online),
90 POWER_SUPPLY_ATTR(technology),
91 POWER_SUPPLY_ATTR(voltage_max_design),
92 POWER_SUPPLY_ATTR(voltage_min_design),
93 POWER_SUPPLY_ATTR(voltage_now),
94 POWER_SUPPLY_ATTR(voltage_avg),
95 POWER_SUPPLY_ATTR(current_now),
96 POWER_SUPPLY_ATTR(current_avg),
97 POWER_SUPPLY_ATTR(charge_full_design),
98 POWER_SUPPLY_ATTR(charge_empty_design),
99 POWER_SUPPLY_ATTR(charge_full),
100 POWER_SUPPLY_ATTR(charge_empty),
101 POWER_SUPPLY_ATTR(charge_now),
102 POWER_SUPPLY_ATTR(charge_avg),
103 POWER_SUPPLY_ATTR(energy_full_design),
104 POWER_SUPPLY_ATTR(energy_empty_design),
105 POWER_SUPPLY_ATTR(energy_full),
106 POWER_SUPPLY_ATTR(energy_empty),
107 POWER_SUPPLY_ATTR(energy_now),
108 POWER_SUPPLY_ATTR(energy_avg),
109 POWER_SUPPLY_ATTR(capacity),
110 POWER_SUPPLY_ATTR(capacity_level),
111 POWER_SUPPLY_ATTR(temp),
112 POWER_SUPPLY_ATTR(temp_ambient),
113 POWER_SUPPLY_ATTR(time_to_empty_now),
114 POWER_SUPPLY_ATTR(time_to_empty_avg),
115 POWER_SUPPLY_ATTR(time_to_full_now),
116 POWER_SUPPLY_ATTR(time_to_full_avg),
117 /* Properties of type `const char *' */
118 POWER_SUPPLY_ATTR(model_name),
119 POWER_SUPPLY_ATTR(manufacturer),
122 static ssize_t power_supply_show_static_attrs(struct device *dev,
123 struct device_attribute *attr,
124 char *buf) {
125 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
126 struct power_supply *psy = dev_get_drvdata(dev);
128 return sprintf(buf, "%s\n", type_text[psy->type]);
131 static struct device_attribute power_supply_static_attrs[] = {
132 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
135 int power_supply_create_attrs(struct power_supply *psy)
137 int rc = 0;
138 int i, j;
140 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
141 rc = device_create_file(psy->dev,
142 &power_supply_static_attrs[i]);
143 if (rc)
144 goto statics_failed;
147 for (j = 0; j < psy->num_properties; j++) {
148 rc = device_create_file(psy->dev,
149 &power_supply_attrs[psy->properties[j]]);
150 if (rc)
151 goto dynamics_failed;
154 goto succeed;
156 dynamics_failed:
157 while (j--)
158 device_remove_file(psy->dev,
159 &power_supply_attrs[psy->properties[j]]);
160 statics_failed:
161 while (i--)
162 device_remove_file(psy->dev,
163 &power_supply_static_attrs[psy->properties[i]]);
164 succeed:
165 return rc;
168 void power_supply_remove_attrs(struct power_supply *psy)
170 int i;
172 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
173 device_remove_file(psy->dev,
174 &power_supply_static_attrs[i]);
176 for (i = 0; i < psy->num_properties; i++)
177 device_remove_file(psy->dev,
178 &power_supply_attrs[psy->properties[i]]);
181 static char *kstruprdup(const char *str, gfp_t gfp)
183 char *ret, *ustr;
185 ustr = ret = kmalloc(strlen(str) + 1, gfp);
187 if (!ret)
188 return NULL;
190 while (*str)
191 *ustr++ = toupper(*str++);
193 *ustr = 0;
195 return ret;
198 int power_supply_uevent(struct device *dev, char **envp, int num_envp,
199 char *buffer, int buffer_size)
201 struct power_supply *psy = dev_get_drvdata(dev);
202 int i = 0, length = 0, ret = 0, j;
203 char *prop_buf;
204 char *attrname;
206 dev_dbg(dev, "uevent\n");
208 if (!psy) {
209 dev_dbg(dev, "No power supply yet\n");
210 return ret;
213 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
215 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
216 &length, "POWER_SUPPLY_NAME=%s", psy->name);
217 if (ret)
218 return ret;
220 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
221 if (!prop_buf)
222 return -ENOMEM;
224 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
225 struct device_attribute *attr;
226 char *line;
228 attr = &power_supply_static_attrs[j];
230 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
231 if (ret < 0)
232 goto out;
234 line = strchr(prop_buf, '\n');
235 if (line)
236 *line = 0;
238 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
239 if (!attrname) {
240 ret = -ENOMEM;
241 goto out;
244 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
246 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
247 &length, "POWER_SUPPLY_%s=%s",
248 attrname, prop_buf);
249 kfree(attrname);
250 if (ret)
251 goto out;
254 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
256 for (j = 0; j < psy->num_properties; j++) {
257 struct device_attribute *attr;
258 char *line;
260 attr = &power_supply_attrs[psy->properties[j]];
262 ret = power_supply_show_property(dev, attr, prop_buf);
263 if (ret == -ENODEV) {
264 /* When a battery is absent, we expect -ENODEV. Don't abort;
265 send the uevent with at least the the PRESENT=0 property */
266 ret = 0;
267 continue;
270 if (ret < 0)
271 goto out;
273 line = strchr(prop_buf, '\n');
274 if (line)
275 *line = 0;
277 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
278 if (!attrname) {
279 ret = -ENOMEM;
280 goto out;
283 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
285 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
286 &length, "POWER_SUPPLY_%s=%s",
287 attrname, prop_buf);
288 kfree(attrname);
289 if (ret)
290 goto out;
293 out:
294 free_page((unsigned long)prop_buf);
296 return ret;