mfd: twl-core: regulator configuration for twl6030 V1V8, V2V1 SMPS
[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                 "Unknown", "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         static char *scope_text[] = {
67                 "Unknown", "System", "Device"
68         };
69         ssize_t ret = 0;
70         struct power_supply *psy = dev_get_drvdata(dev);
71         const ptrdiff_t off = attr - power_supply_attrs;
72         union power_supply_propval value;
73
74         if (off == POWER_SUPPLY_PROP_TYPE)
75                 value.intval = psy->type;
76         else
77                 ret = psy->get_property(psy, off, &value);
78
79         if (ret < 0) {
80                 if (ret == -ENODATA)
81                         dev_dbg(dev, "driver has no data for `%s' property\n",
82                                 attr->attr.name);
83                 else if (ret != -ENODEV)
84                         dev_err(dev, "driver failed to report `%s' property: %zd\n",
85                                 attr->attr.name, ret);
86                 return ret;
87         }
88
89         if (off == POWER_SUPPLY_PROP_STATUS)
90                 return sprintf(buf, "%s\n", status_text[value.intval]);
91         else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
92                 return sprintf(buf, "%s\n", charge_type[value.intval]);
93         else if (off == POWER_SUPPLY_PROP_HEALTH)
94                 return sprintf(buf, "%s\n", health_text[value.intval]);
95         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
96                 return sprintf(buf, "%s\n", technology_text[value.intval]);
97         else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
98                 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
99         else if (off == POWER_SUPPLY_PROP_TYPE)
100                 return sprintf(buf, "%s\n", type_text[value.intval]);
101         else if (off == POWER_SUPPLY_PROP_SCOPE)
102                 return sprintf(buf, "%s\n", scope_text[value.intval]);
103         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
104                 return sprintf(buf, "%s\n", value.strval);
105
106         return sprintf(buf, "%d\n", value.intval);
107 }
108
109 static ssize_t power_supply_store_property(struct device *dev,
110                                            struct device_attribute *attr,
111                                            const char *buf, size_t count) {
112         ssize_t ret;
113         struct power_supply *psy = dev_get_drvdata(dev);
114         const ptrdiff_t off = attr - power_supply_attrs;
115         union power_supply_propval value;
116         long long_val;
117
118         /* TODO: support other types than int */
119         ret = strict_strtol(buf, 10, &long_val);
120         if (ret < 0)
121                 return ret;
122
123         value.intval = long_val;
124
125         ret = psy->set_property(psy, off, &value);
126         if (ret < 0)
127                 return ret;
128
129         return count;
130 }
131
132 /* Must be in the same order as POWER_SUPPLY_PROP_* */
133 static struct device_attribute power_supply_attrs[] = {
134         /* Properties of type `int' */
135         POWER_SUPPLY_ATTR(status),
136         POWER_SUPPLY_ATTR(charge_type),
137         POWER_SUPPLY_ATTR(health),
138         POWER_SUPPLY_ATTR(present),
139         POWER_SUPPLY_ATTR(online),
140         POWER_SUPPLY_ATTR(technology),
141         POWER_SUPPLY_ATTR(cycle_count),
142         POWER_SUPPLY_ATTR(voltage_max),
143         POWER_SUPPLY_ATTR(voltage_min),
144         POWER_SUPPLY_ATTR(voltage_max_design),
145         POWER_SUPPLY_ATTR(voltage_min_design),
146         POWER_SUPPLY_ATTR(voltage_now),
147         POWER_SUPPLY_ATTR(voltage_avg),
148         POWER_SUPPLY_ATTR(current_max),
149         POWER_SUPPLY_ATTR(current_now),
150         POWER_SUPPLY_ATTR(current_avg),
151         POWER_SUPPLY_ATTR(power_now),
152         POWER_SUPPLY_ATTR(power_avg),
153         POWER_SUPPLY_ATTR(charge_full_design),
154         POWER_SUPPLY_ATTR(charge_empty_design),
155         POWER_SUPPLY_ATTR(charge_full),
156         POWER_SUPPLY_ATTR(charge_empty),
157         POWER_SUPPLY_ATTR(charge_now),
158         POWER_SUPPLY_ATTR(charge_avg),
159         POWER_SUPPLY_ATTR(charge_counter),
160         POWER_SUPPLY_ATTR(energy_full_design),
161         POWER_SUPPLY_ATTR(energy_empty_design),
162         POWER_SUPPLY_ATTR(energy_full),
163         POWER_SUPPLY_ATTR(energy_empty),
164         POWER_SUPPLY_ATTR(energy_now),
165         POWER_SUPPLY_ATTR(energy_avg),
166         POWER_SUPPLY_ATTR(capacity),
167         POWER_SUPPLY_ATTR(capacity_level),
168         POWER_SUPPLY_ATTR(temp),
169         POWER_SUPPLY_ATTR(temp_ambient),
170         POWER_SUPPLY_ATTR(time_to_empty_now),
171         POWER_SUPPLY_ATTR(time_to_empty_avg),
172         POWER_SUPPLY_ATTR(time_to_full_now),
173         POWER_SUPPLY_ATTR(time_to_full_avg),
174         POWER_SUPPLY_ATTR(type),
175         POWER_SUPPLY_ATTR(scope),
176         /* Properties of type `const char *' */
177         POWER_SUPPLY_ATTR(model_name),
178         POWER_SUPPLY_ATTR(manufacturer),
179         POWER_SUPPLY_ATTR(serial_number),
180 };
181
182 static struct attribute *
183 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
184
185 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
186                                            struct attribute *attr,
187                                            int attrno)
188 {
189         struct device *dev = container_of(kobj, struct device, kobj);
190         struct power_supply *psy = dev_get_drvdata(dev);
191         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
192         int i;
193
194         if (attrno == POWER_SUPPLY_PROP_TYPE)
195                 return mode;
196
197         for (i = 0; i < psy->num_properties; i++) {
198                 int property = psy->properties[i];
199
200                 if (property == attrno) {
201                         if (psy->property_is_writeable &&
202                             psy->property_is_writeable(psy, property) > 0)
203                                 mode |= S_IWUSR;
204
205                         return mode;
206                 }
207         }
208
209         return 0;
210 }
211
212 static struct attribute_group power_supply_attr_group = {
213         .attrs = __power_supply_attrs,
214         .is_visible = power_supply_attr_is_visible,
215 };
216
217 static const struct attribute_group *power_supply_attr_groups[] = {
218         &power_supply_attr_group,
219         NULL,
220 };
221
222 void power_supply_init_attrs(struct device_type *dev_type)
223 {
224         int i;
225
226         dev_type->groups = power_supply_attr_groups;
227
228         for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
229                 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
230 }
231
232 static char *kstruprdup(const char *str, gfp_t gfp)
233 {
234         char *ret, *ustr;
235
236         ustr = ret = kmalloc(strlen(str) + 1, gfp);
237
238         if (!ret)
239                 return NULL;
240
241         while (*str)
242                 *ustr++ = toupper(*str++);
243
244         *ustr = 0;
245
246         return ret;
247 }
248
249 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
250 {
251         struct power_supply *psy = dev_get_drvdata(dev);
252         int ret = 0, j;
253         char *prop_buf;
254         char *attrname;
255
256         dev_dbg(dev, "uevent\n");
257
258         if (!psy || !psy->dev) {
259                 dev_dbg(dev, "No power supply yet\n");
260                 return ret;
261         }
262
263         dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
264
265         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
266         if (ret)
267                 return ret;
268
269         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
270         if (!prop_buf)
271                 return -ENOMEM;
272
273         for (j = 0; j < psy->num_properties; j++) {
274                 struct device_attribute *attr;
275                 char *line;
276
277                 attr = &power_supply_attrs[psy->properties[j]];
278
279                 ret = power_supply_show_property(dev, attr, prop_buf);
280                 if (ret == -ENODEV || ret == -ENODATA) {
281                         /* When a battery is absent, we expect -ENODEV. Don't abort;
282                            send the uevent with at least the the PRESENT=0 property */
283                         ret = 0;
284                         continue;
285                 }
286
287                 if (ret < 0)
288                         goto out;
289
290                 line = strchr(prop_buf, '\n');
291                 if (line)
292                         *line = 0;
293
294                 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
295                 if (!attrname) {
296                         ret = -ENOMEM;
297                         goto out;
298                 }
299
300                 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
301
302                 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
303                 kfree(attrname);
304                 if (ret)
305                         goto out;
306         }
307
308 out:
309         free_page((unsigned long)prop_buf);
310
311         return ret;
312 }