Merge branch 'platform_battery-2.6.34' into om-gta02-2.6.34
[kernel.git] / drivers / power / power_supply_sysfs.c
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 #include <linux/slab.h>
17
18 #include "power_supply.h"
19
20 /*
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.
24  *
25  * The source of this definition is the device.h which calls __ATTR
26  * macro in sysfs.h which calls the __stringify macro.
27  *
28  * Only modification that the name is not tried to be resolved
29  * (as a macro let's say).
30  */
31
32 #define POWER_SUPPLY_ATTR(_name)                                        \
33 {                                                                       \
34         .attr = { .name = #_name, .mode = 0444 },       \
35         .show = power_supply_show_property,                             \
36         .store = NULL,                                                  \
37 }
38
39 static struct device_attribute power_supply_attrs[];
40
41 static ssize_t power_supply_show_property(struct device *dev,
42                                           struct device_attribute *attr,
43                                           char *buf) {
44         static char *status_text[] = {
45                 "Unknown", "Charging", "Discharging", "Not charging", "Full"
46         };
47         static char *charge_type[] = {
48                 "Unknown", "N/A", "Trickle", "Fast"
49         };
50         static char *health_text[] = {
51                 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
52                 "Unspecified failure", "Cold",
53         };
54         static char *technology_text[] = {
55                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
56                 "LiMn"
57         };
58         static char *capacity_level_text[] = {
59                 "Unknown", "Critical", "Low", "Normal", "High", "Full"
60         };
61         ssize_t ret;
62         struct power_supply *psy = dev_get_drvdata(dev);
63         const ptrdiff_t off = attr - power_supply_attrs;
64         union power_supply_propval value;
65
66         ret = psy->get_property(psy, off, &value);
67
68         if (ret < 0) {
69                 if (ret == -ENODATA)
70                         dev_dbg(dev, "driver has no data for `%s' property\n",
71                                 attr->attr.name);
72                 else if (ret != -ENODEV)
73                         dev_err(dev, "driver failed to report `%s' property\n",
74                                 attr->attr.name);
75                 return ret;
76         }
77
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);
90
91         return sprintf(buf, "%d\n", value.intval);
92 }
93
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),
139 };
140
141 static ssize_t power_supply_show_static_attrs(struct device *dev,
142                                               struct device_attribute *attr,
143                                               char *buf) {
144         static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
145         struct power_supply *psy = dev_get_drvdata(dev);
146
147         return sprintf(buf, "%s\n", type_text[psy->type]);
148 }
149
150 static struct device_attribute power_supply_static_attrs[] = {
151         __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
152 };
153
154 int power_supply_create_attrs(struct power_supply *psy)
155 {
156         int rc = 0;
157         int i, j;
158
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]);
162                 if (rc)
163                         goto statics_failed;
164         }
165
166         for (j = 0; j < psy->num_properties; j++) {
167                 rc = device_create_file(psy->dev,
168                             &power_supply_attrs[psy->properties[j]]);
169                 if (rc)
170                         goto dynamics_failed;
171         }
172
173         goto succeed;
174
175 dynamics_failed:
176         while (j--)
177                 device_remove_file(psy->dev,
178                            &power_supply_attrs[psy->properties[j]]);
179 statics_failed:
180         while (i--)
181                 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
182 succeed:
183         return rc;
184 }
185
186 void power_supply_remove_attrs(struct power_supply *psy)
187 {
188         int i;
189
190         for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
191                 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
192
193         for (i = 0; i < psy->num_properties; i++)
194                 device_remove_file(psy->dev,
195                             &power_supply_attrs[psy->properties[i]]);
196 }
197
198 static char *kstruprdup(const char *str, gfp_t gfp)
199 {
200         char *ret, *ustr;
201
202         ustr = ret = kmalloc(strlen(str) + 1, gfp);
203
204         if (!ret)
205                 return NULL;
206
207         while (*str)
208                 *ustr++ = toupper(*str++);
209
210         *ustr = 0;
211
212         return ret;
213 }
214
215 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
216 {
217         struct power_supply *psy = dev_get_drvdata(dev);
218         int ret = 0, j;
219         char *prop_buf;
220         char *attrname;
221
222         dev_dbg(dev, "uevent\n");
223
224         if (!psy || !psy->dev) {
225                 dev_dbg(dev, "No power supply yet\n");
226                 return ret;
227         }
228
229         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
230
231         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
232         if (ret)
233                 return ret;
234
235         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
236         if (!prop_buf)
237                 return -ENOMEM;
238
239         for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
240                 struct device_attribute *attr;
241                 char *line;
242
243                 attr = &power_supply_static_attrs[j];
244
245                 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
246                 if (ret < 0)
247                         goto out;
248
249                 line = strchr(prop_buf, '\n');
250                 if (line)
251                         *line = 0;
252
253                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
254                 if (!attrname) {
255                         ret = -ENOMEM;
256                         goto out;
257                 }
258
259                 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
260
261                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
262                 kfree(attrname);
263                 if (ret)
264                         goto out;
265         }
266
267         dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
268
269         for (j = 0; j < psy->num_properties; j++) {
270                 struct device_attribute *attr;
271                 char *line;
272
273                 attr = &power_supply_attrs[psy->properties[j]];
274
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 */
279                         ret = 0;
280                         continue;
281                 }
282
283                 if (ret < 0)
284                         goto out;
285
286                 line = strchr(prop_buf, '\n');
287                 if (line)
288                         *line = 0;
289
290                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
291                 if (!attrname) {
292                         ret = -ENOMEM;
293                         goto out;
294                 }
295
296                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
297
298                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
299                 kfree(attrname);
300                 if (ret)
301                         goto out;
302         }
303
304 out:
305         free_page((unsigned long)prop_buf);
306
307         return ret;
308 }