a5ef8c36253623b478f2af9c0ffc6dcb4b5f5df3
[linux-2.6.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/device.h>
16 #include <linux/power_supply.h>
17 #include <linux/slab.h>
18 #include <linux/stat.h>
19
20 #include "power_supply.h"
21
22 /*
23  * This is because the name "current" breaks the device attr macro.
24  * The "current" word resolves to "(get_current())" so instead of
25  * "current" "(get_current())" appears in the sysfs.
26  *
27  * The source of this definition is the device.h which calls __ATTR
28  * macro in sysfs.h which calls the __stringify macro.
29  *
30  * Only modification that the name is not tried to be resolved
31  * (as a macro let's say).
32  */
33
34 #define POWER_SUPPLY_ATTR(_name)                                        \
35 {                                                                       \
36         .attr = { .name = #_name },                                     \
37         .show = power_supply_show_property,                             \
38         .store = power_supply_store_property,                           \
39 }
40
41 static struct device_attribute power_supply_attrs[];
42
43 static ssize_t power_supply_show_property(struct device *dev,
44                                           struct device_attribute *attr,
45                                           char *buf) {
46         static char *type_text[] = {
47                 "Unknown", "Battery", "UPS", "Mains", "USB",
48                 "USB_DCP", "USB_CDP", "USB_ACA"
49         };
50         static char *status_text[] = {
51                 "Unknown", "Charging", "Discharging", "Not charging", "Full"
52         };
53         static char *charge_type[] = {
54                 "Unknown", "N/A", "Trickle", "Fast"
55         };
56         static char *health_text[] = {
57                 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
58                 "Unspecified failure", "Cold",
59         };
60         static char *technology_text[] = {
61                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
62                 "LiMn"
63         };
64         static char *capacity_level_text[] = {
65                 "Unknown", "Critical", "Low", "Normal", "High", "Full"
66         };
67         static char *scope_text[] = {
68                 "Unknown", "System", "Device"
69         };
70         ssize_t ret = 0;
71         struct power_supply *psy = dev_get_drvdata(dev);
72         const ptrdiff_t off = attr - power_supply_attrs;
73         union power_supply_propval value;
74
75         if (off == POWER_SUPPLY_PROP_TYPE)
76                 value.intval = psy->type;
77         else
78                 ret = psy->get_property(psy, off, &value);
79
80         if (ret < 0) {
81                 if (ret == -ENODATA)
82                         dev_dbg(dev, "driver has no data for `%s' property\n",
83                                 attr->attr.name);
84                 else if (ret != -ENODEV)
85                         dev_err(dev, "driver failed to report `%s' property: %zd\n",
86                                 attr->attr.name, ret);
87                 return ret;
88         }
89
90         if (off == POWER_SUPPLY_PROP_STATUS)
91                 return sprintf(buf, "%s\n", status_text[value.intval]);
92         else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
93                 return sprintf(buf, "%s\n", charge_type[value.intval]);
94         else if (off == POWER_SUPPLY_PROP_HEALTH)
95                 return sprintf(buf, "%s\n", health_text[value.intval]);
96         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
97                 return sprintf(buf, "%s\n", technology_text[value.intval]);
98         else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
99                 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
100         else if (off == POWER_SUPPLY_PROP_TYPE)
101                 return sprintf(buf, "%s\n", type_text[value.intval]);
102         else if (off == POWER_SUPPLY_PROP_SCOPE)
103                 return sprintf(buf, "%s\n", scope_text[value.intval]);
104         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
105                 return sprintf(buf, "%s\n", value.strval);
106
107         return sprintf(buf, "%d\n", value.intval);
108 }
109
110 static ssize_t power_supply_store_property(struct device *dev,
111                                            struct device_attribute *attr,
112                                            const char *buf, size_t count) {
113         ssize_t ret;
114         struct power_supply *psy = dev_get_drvdata(dev);
115         const ptrdiff_t off = attr - power_supply_attrs;
116         union power_supply_propval value;
117         long long_val;
118
119         /* TODO: support other types than int */
120         ret = strict_strtol(buf, 10, &long_val);
121         if (ret < 0)
122                 return ret;
123
124         value.intval = long_val;
125
126         ret = psy->set_property(psy, off, &value);
127         if (ret < 0)
128                 return ret;
129
130         return count;
131 }
132
133 /* Must be in the same order as POWER_SUPPLY_PROP_* */
134 static struct device_attribute power_supply_attrs[] = {
135         /* Properties of type `int' */
136         POWER_SUPPLY_ATTR(status),
137         POWER_SUPPLY_ATTR(charge_type),
138         POWER_SUPPLY_ATTR(health),
139         POWER_SUPPLY_ATTR(present),
140         POWER_SUPPLY_ATTR(online),
141         POWER_SUPPLY_ATTR(technology),
142         POWER_SUPPLY_ATTR(cycle_count),
143         POWER_SUPPLY_ATTR(voltage_max),
144         POWER_SUPPLY_ATTR(voltage_min),
145         POWER_SUPPLY_ATTR(voltage_max_design),
146         POWER_SUPPLY_ATTR(voltage_min_design),
147         POWER_SUPPLY_ATTR(voltage_now),
148         POWER_SUPPLY_ATTR(voltage_avg),
149         POWER_SUPPLY_ATTR(current_max),
150         POWER_SUPPLY_ATTR(current_now),
151         POWER_SUPPLY_ATTR(current_avg),
152         POWER_SUPPLY_ATTR(power_now),
153         POWER_SUPPLY_ATTR(power_avg),
154         POWER_SUPPLY_ATTR(charge_full_design),
155         POWER_SUPPLY_ATTR(charge_empty_design),
156         POWER_SUPPLY_ATTR(charge_full),
157         POWER_SUPPLY_ATTR(charge_empty),
158         POWER_SUPPLY_ATTR(charge_now),
159         POWER_SUPPLY_ATTR(charge_avg),
160         POWER_SUPPLY_ATTR(charge_counter),
161         POWER_SUPPLY_ATTR(energy_full_design),
162         POWER_SUPPLY_ATTR(energy_empty_design),
163         POWER_SUPPLY_ATTR(energy_full),
164         POWER_SUPPLY_ATTR(energy_empty),
165         POWER_SUPPLY_ATTR(energy_now),
166         POWER_SUPPLY_ATTR(energy_avg),
167         POWER_SUPPLY_ATTR(capacity),
168         POWER_SUPPLY_ATTR(capacity_level),
169         POWER_SUPPLY_ATTR(temp),
170         POWER_SUPPLY_ATTR(temp_ambient),
171         POWER_SUPPLY_ATTR(time_to_empty_now),
172         POWER_SUPPLY_ATTR(time_to_empty_avg),
173         POWER_SUPPLY_ATTR(time_to_full_now),
174         POWER_SUPPLY_ATTR(time_to_full_avg),
175         POWER_SUPPLY_ATTR(type),
176         POWER_SUPPLY_ATTR(scope),
177         /* Local extensions */
178         POWER_SUPPLY_ATTR(usb_hc),
179         POWER_SUPPLY_ATTR(usb_otg),
180         /* Properties of type `const char *' */
181         POWER_SUPPLY_ATTR(model_name),
182         POWER_SUPPLY_ATTR(manufacturer),
183         POWER_SUPPLY_ATTR(serial_number),
184 };
185
186 static struct attribute *
187 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
188
189 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
190                                            struct attribute *attr,
191                                            int attrno)
192 {
193         struct device *dev = container_of(kobj, struct device, kobj);
194         struct power_supply *psy = dev_get_drvdata(dev);
195         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
196         int i;
197
198         if (attrno == POWER_SUPPLY_PROP_TYPE)
199                 return mode;
200
201         for (i = 0; i < psy->num_properties; i++) {
202                 int property = psy->properties[i];
203
204                 if (property == attrno) {
205                         if (psy->property_is_writeable &&
206                             psy->property_is_writeable(psy, property) > 0)
207                                 mode |= S_IWUSR;
208
209                         return mode;
210                 }
211         }
212
213         return 0;
214 }
215
216 static struct attribute_group power_supply_attr_group = {
217         .attrs = __power_supply_attrs,
218         .is_visible = power_supply_attr_is_visible,
219 };
220
221 static const struct attribute_group *power_supply_attr_groups[] = {
222         &power_supply_attr_group,
223         NULL,
224 };
225
226 void power_supply_init_attrs(struct device_type *dev_type)
227 {
228         int i;
229
230         dev_type->groups = power_supply_attr_groups;
231
232         for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
233                 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
234 }
235
236 static char *kstruprdup(const char *str, gfp_t gfp)
237 {
238         char *ret, *ustr;
239
240         ustr = ret = kmalloc(strlen(str) + 1, gfp);
241
242         if (!ret)
243                 return NULL;
244
245         while (*str)
246                 *ustr++ = toupper(*str++);
247
248         *ustr = 0;
249
250         return ret;
251 }
252
253 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
254 {
255         struct power_supply *psy = dev_get_drvdata(dev);
256         int ret = 0, j;
257         char *prop_buf;
258         char *attrname;
259
260         dev_dbg(dev, "uevent\n");
261
262         if (!psy || !psy->dev) {
263                 dev_dbg(dev, "No power supply yet\n");
264                 return ret;
265         }
266
267         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
268
269         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
270         if (ret)
271                 return ret;
272
273         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
274         if (!prop_buf)
275                 return -ENOMEM;
276
277         for (j = 0; j < psy->num_properties; j++) {
278                 struct device_attribute *attr;
279                 char *line;
280
281                 attr = &power_supply_attrs[psy->properties[j]];
282
283                 ret = power_supply_show_property(dev, attr, prop_buf);
284                 if (ret == -ENODEV || ret == -ENODATA) {
285                         /* When a battery is absent, we expect -ENODEV. Don't abort;
286                            send the uevent with at least the the PRESENT=0 property */
287                         ret = 0;
288                         continue;
289                 }
290
291                 if (ret < 0)
292                         goto out;
293
294                 line = strchr(prop_buf, '\n');
295                 if (line)
296                         *line = 0;
297
298                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
299                 if (!attrname) {
300                         ret = -ENOMEM;
301                         goto out;
302                 }
303
304                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
305
306                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
307                 kfree(attrname);
308                 if (ret)
309                         goto out;
310         }
311
312 out:
313         free_page((unsigned long)prop_buf);
314
315         return ret;
316 }