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
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)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
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)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
power_supply_init_attrs(struct device_type * dev_type)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
kstruprdup(const char * str,gfp_t gfp)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
power_supply_uevent(struct device * dev,struct kobj_uevent_env * env)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 }
313