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