Merge branch 'mfd/wm8994' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[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/power_supply.h>
16 #include <linux/slab.h>
17 #include <linux/stat.h>
18
19 #include "power_supply.h"
20
21 /*
22  * This is because the name "current" breaks the device attr macro.
23  * The "current" word resolves to "(get_current())" so instead of
24  * "current" "(get_current())" appears in the sysfs.
25  *
26  * The source of this definition is the device.h which calls __ATTR
27  * macro in sysfs.h which calls the __stringify macro.
28  *
29  * Only modification that the name is not tried to be resolved
30  * (as a macro let's say).
31  */
32
33 #define POWER_SUPPLY_ATTR(_name)                                        \
34 {                                                                       \
35         .attr = { .name = #_name },                                     \
36         .show = power_supply_show_property,                             \
37         .store = power_supply_store_property,                           \
38 }
39
40 static struct device_attribute power_supply_attrs[];
41
42 static ssize_t power_supply_show_property(struct device *dev,
43                                           struct device_attribute *attr,
44                                           char *buf) {
45         static char *type_text[] = {
46                 "Battery", "UPS", "Mains", "USB",
47                 "USB_DCP", "USB_CDP", "USB_ACA"
48         };
49         static char *status_text[] = {
50                 "Unknown", "Charging", "Discharging", "Not charging", "Full"
51         };
52         static char *charge_type[] = {
53                 "Unknown", "N/A", "Trickle", "Fast"
54         };
55         static char *health_text[] = {
56                 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
57                 "Unspecified failure", "Cold",
58         };
59         static char *technology_text[] = {
60                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
61                 "LiMn"
62         };
63         static char *capacity_level_text[] = {
64                 "Unknown", "Critical", "Low", "Normal", "High", "Full"
65         };
66         ssize_t ret = 0;
67         struct power_supply *psy = dev_get_drvdata(dev);
68         const ptrdiff_t off = attr - power_supply_attrs;
69         union power_supply_propval value;
70
71         if (off == POWER_SUPPLY_PROP_TYPE)
72                 value.intval = psy->type;
73         else
74                 ret = psy->get_property(psy, off, &value);
75
76         if (ret < 0) {
77                 if (ret == -ENODATA)
78                         dev_dbg(dev, "driver has no data for `%s' property\n",
79                                 attr->attr.name);
80                 else if (ret != -ENODEV)
81                         dev_err(dev, "driver failed to report `%s' property\n",
82                                 attr->attr.name);
83                 return ret;
84         }
85
86         if (off == POWER_SUPPLY_PROP_STATUS)
87                 return sprintf(buf, "%s\n", status_text[value.intval]);
88         else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
89                 return sprintf(buf, "%s\n", charge_type[value.intval]);
90         else if (off == POWER_SUPPLY_PROP_HEALTH)
91                 return sprintf(buf, "%s\n", health_text[value.intval]);
92         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
93                 return sprintf(buf, "%s\n", technology_text[value.intval]);
94         else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
95                 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
96         else if (off == POWER_SUPPLY_PROP_TYPE)
97                 return sprintf(buf, "%s\n", type_text[value.intval]);
98         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
99                 return sprintf(buf, "%s\n", value.strval);
100
101         return sprintf(buf, "%d\n", value.intval);
102 }
103
104 static ssize_t power_supply_store_property(struct device *dev,
105                                            struct device_attribute *attr,
106                                            const char *buf, size_t count) {
107         ssize_t ret;
108         struct power_supply *psy = dev_get_drvdata(dev);
109         const ptrdiff_t off = attr - power_supply_attrs;
110         union power_supply_propval value;
111         long long_val;
112
113         /* TODO: support other types than int */
114         ret = strict_strtol(buf, 10, &long_val);
115         if (ret < 0)
116                 return ret;
117
118         value.intval = long_val;
119
120         ret = psy->set_property(psy, off, &value);
121         if (ret < 0)
122                 return ret;
123
124         return count;
125 }
126
127 /* Must be in the same order as POWER_SUPPLY_PROP_* */
128 static struct device_attribute power_supply_attrs[] = {
129         /* Properties of type `int' */
130         POWER_SUPPLY_ATTR(status),
131         POWER_SUPPLY_ATTR(charge_type),
132         POWER_SUPPLY_ATTR(health),
133         POWER_SUPPLY_ATTR(present),
134         POWER_SUPPLY_ATTR(online),
135         POWER_SUPPLY_ATTR(technology),
136         POWER_SUPPLY_ATTR(cycle_count),
137         POWER_SUPPLY_ATTR(voltage_max),
138         POWER_SUPPLY_ATTR(voltage_min),
139         POWER_SUPPLY_ATTR(voltage_max_design),
140         POWER_SUPPLY_ATTR(voltage_min_design),
141         POWER_SUPPLY_ATTR(voltage_now),
142         POWER_SUPPLY_ATTR(voltage_avg),
143         POWER_SUPPLY_ATTR(current_max),
144         POWER_SUPPLY_ATTR(current_now),
145         POWER_SUPPLY_ATTR(current_avg),
146         POWER_SUPPLY_ATTR(power_now),
147         POWER_SUPPLY_ATTR(power_avg),
148         POWER_SUPPLY_ATTR(charge_full_design),
149         POWER_SUPPLY_ATTR(charge_empty_design),
150         POWER_SUPPLY_ATTR(charge_full),
151         POWER_SUPPLY_ATTR(charge_empty),
152         POWER_SUPPLY_ATTR(charge_now),
153         POWER_SUPPLY_ATTR(charge_avg),
154         POWER_SUPPLY_ATTR(charge_counter),
155         POWER_SUPPLY_ATTR(energy_full_design),
156         POWER_SUPPLY_ATTR(energy_empty_design),
157         POWER_SUPPLY_ATTR(energy_full),
158         POWER_SUPPLY_ATTR(energy_empty),
159         POWER_SUPPLY_ATTR(energy_now),
160         POWER_SUPPLY_ATTR(energy_avg),
161         POWER_SUPPLY_ATTR(capacity),
162         POWER_SUPPLY_ATTR(capacity_level),
163         POWER_SUPPLY_ATTR(temp),
164         POWER_SUPPLY_ATTR(temp_ambient),
165         POWER_SUPPLY_ATTR(time_to_empty_now),
166         POWER_SUPPLY_ATTR(time_to_empty_avg),
167         POWER_SUPPLY_ATTR(time_to_full_now),
168         POWER_SUPPLY_ATTR(time_to_full_avg),
169         POWER_SUPPLY_ATTR(type),
170         /* Properties of type `const char *' */
171         POWER_SUPPLY_ATTR(model_name),
172         POWER_SUPPLY_ATTR(manufacturer),
173         POWER_SUPPLY_ATTR(serial_number),
174 };
175
176 static struct attribute *
177 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
178
179 static mode_t power_supply_attr_is_visible(struct kobject *kobj,
180                                            struct attribute *attr,
181                                            int attrno)
182 {
183         struct device *dev = container_of(kobj, struct device, kobj);
184         struct power_supply *psy = dev_get_drvdata(dev);
185         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
186         int i;
187
188         if (attrno == POWER_SUPPLY_PROP_TYPE)
189                 return mode;
190
191         for (i = 0; i < psy->num_properties; i++) {
192                 int property = psy->properties[i];
193
194                 if (property == attrno) {
195                         if (psy->property_is_writeable &&
196                             psy->property_is_writeable(psy, property) > 0)
197                                 mode |= S_IWUSR;
198
199                         return mode;
200                 }
201         }
202
203         return 0;
204 }
205
206 static struct attribute_group power_supply_attr_group = {
207         .attrs = __power_supply_attrs,
208         .is_visible = power_supply_attr_is_visible,
209 };
210
211 static const struct attribute_group *power_supply_attr_groups[] = {
212         &power_supply_attr_group,
213         NULL,
214 };
215
216 void power_supply_init_attrs(struct device_type *dev_type)
217 {
218         int i;
219
220         dev_type->groups = power_supply_attr_groups;
221
222         for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
223                 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
224 }
225
226 static char *kstruprdup(const char *str, gfp_t gfp)
227 {
228         char *ret, *ustr;
229
230         ustr = ret = kmalloc(strlen(str) + 1, gfp);
231
232         if (!ret)
233                 return NULL;
234
235         while (*str)
236                 *ustr++ = toupper(*str++);
237
238         *ustr = 0;
239
240         return ret;
241 }
242
243 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
244 {
245         struct power_supply *psy = dev_get_drvdata(dev);
246         int ret = 0, j;
247         char *prop_buf;
248         char *attrname;
249
250         dev_dbg(dev, "uevent\n");
251
252         if (!psy || !psy->dev) {
253                 dev_dbg(dev, "No power supply yet\n");
254                 return ret;
255         }
256
257         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
258
259         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
260         if (ret)
261                 return ret;
262
263         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
264         if (!prop_buf)
265                 return -ENOMEM;
266
267         for (j = 0; j < psy->num_properties; j++) {
268                 struct device_attribute *attr;
269                 char *line;
270
271                 attr = &power_supply_attrs[psy->properties[j]];
272
273                 ret = power_supply_show_property(dev, attr, prop_buf);
274                 if (ret == -ENODEV || ret == -ENODATA) {
275                         /* When a battery is absent, we expect -ENODEV. Don't abort;
276                            send the uevent with at least the the PRESENT=0 property */
277                         ret = 0;
278                         continue;
279                 }
280
281                 if (ret < 0)
282                         goto out;
283
284                 line = strchr(prop_buf, '\n');
285                 if (line)
286                         *line = 0;
287
288                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
289                 if (!attrname) {
290                         ret = -ENOMEM;
291                         goto out;
292                 }
293
294                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
295
296                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
297                 kfree(attrname);
298                 if (ret)
299                         goto out;
300         }
301
302 out:
303         free_page((unsigned long)prop_buf);
304
305         return ret;
306 }