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
17 #include "power_supply.h"
18
19 /*
20 * This is because the name "current" breaks the device attr macro.
21 * The "current" word resolves to "(get_current())" so instead of
22 * "current" "(get_current())" appears in the sysfs.
23 *
24 * The source of this definition is the device.h which calls __ATTR
25 * macro in sysfs.h which calls the __stringify macro.
26 *
27 * Only modification that the name is not tried to be resolved
28 * (as a macro let's say).
29 */
30
31 #define POWER_SUPPLY_ATTR(_name) \
32 { \
33 .attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
34 .show = power_supply_show_property, \
35 .store = NULL, \
36 }
37
38 static struct device_attribute power_supply_attrs[];
39
40 static ssize_t power_supply_show_property(struct device *dev,
41 struct device_attribute *attr,
42 char *buf) {
43 static char *status_text[] = {
44 "Unknown", "Charging", "Discharging", "Not charging", "Full"
45 };
46 static char *health_text[] = {
47 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
48 "Unspecified failure"
49 };
50 static char *technology_text[] = {
51 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
52 "LiMn"
53 };
54 ssize_t ret;
55 struct power_supply *psy = dev_get_drvdata(dev);
56 const ptrdiff_t off = attr - power_supply_attrs;
57 union power_supply_propval value;
58
59 ret = psy->get_property(psy, off, &value);
60
61 if (ret < 0) {
62 if (ret != -ENODEV)
63 dev_err(dev, "driver failed to report `%s' property\n",
64 attr->attr.name);
65 return ret;
66 }
67
68 if (off == POWER_SUPPLY_PROP_STATUS)
69 return sprintf(buf, "%s\n", status_text[value.intval]);
70 else if (off == POWER_SUPPLY_PROP_HEALTH)
71 return sprintf(buf, "%s\n", health_text[value.intval]);
72 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
73 return sprintf(buf, "%s\n", technology_text[value.intval]);
74 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
75 return sprintf(buf, "%s\n", value.strval);
76
77 return sprintf(buf, "%d\n", value.intval);
78 }
79
80 /* Must be in the same order as POWER_SUPPLY_PROP_* */
81 static struct device_attribute power_supply_attrs[] = {
82 /* Properties of type `int' */
83 POWER_SUPPLY_ATTR(status),
84 POWER_SUPPLY_ATTR(health),
85 POWER_SUPPLY_ATTR(present),
86 POWER_SUPPLY_ATTR(online),
87 POWER_SUPPLY_ATTR(technology),
88 POWER_SUPPLY_ATTR(voltage_max),
89 POWER_SUPPLY_ATTR(voltage_min),
90 POWER_SUPPLY_ATTR(voltage_max_design),
91 POWER_SUPPLY_ATTR(voltage_min_design),
92 POWER_SUPPLY_ATTR(voltage_now),
93 POWER_SUPPLY_ATTR(voltage_avg),
94 POWER_SUPPLY_ATTR(current_now),
95 POWER_SUPPLY_ATTR(current_avg),
96 POWER_SUPPLY_ATTR(charge_full_design),
97 POWER_SUPPLY_ATTR(charge_empty_design),
98 POWER_SUPPLY_ATTR(charge_full),
99 POWER_SUPPLY_ATTR(charge_empty),
100 POWER_SUPPLY_ATTR(charge_now),
101 POWER_SUPPLY_ATTR(charge_avg),
102 POWER_SUPPLY_ATTR(energy_full_design),
103 POWER_SUPPLY_ATTR(energy_empty_design),
104 POWER_SUPPLY_ATTR(energy_full),
105 POWER_SUPPLY_ATTR(energy_empty),
106 POWER_SUPPLY_ATTR(energy_now),
107 POWER_SUPPLY_ATTR(energy_avg),
108 POWER_SUPPLY_ATTR(capacity),
109 POWER_SUPPLY_ATTR(temp),
110 POWER_SUPPLY_ATTR(temp_ambient),
111 POWER_SUPPLY_ATTR(time_to_empty_now),
112 POWER_SUPPLY_ATTR(time_to_empty_avg),
113 POWER_SUPPLY_ATTR(time_to_full_now),
114 POWER_SUPPLY_ATTR(time_to_full_avg),
115 /* Properties of type `const char *' */
116 POWER_SUPPLY_ATTR(model_name),
117 POWER_SUPPLY_ATTR(manufacturer),
118 POWER_SUPPLY_ATTR(serial_number),
119 };
120
121 static ssize_t power_supply_show_static_attrs(struct device *dev,
122 struct device_attribute *attr,
123 char *buf) {
124 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
125 struct power_supply *psy = dev_get_drvdata(dev);
126
127 return sprintf(buf, "%s\n", type_text[psy->type]);
128 }
129
130 static struct device_attribute power_supply_static_attrs[] = {
131 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
132 };
133
134 int power_supply_create_attrs(struct power_supply *psy)
135 {
136 int rc = 0;
137 int i, j;
138
139 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
140 rc = device_create_file(psy->dev,
141 &power_supply_static_attrs[i]);
142 if (rc)
143 goto statics_failed;
144 }
145
146 for (j = 0; j < psy->num_properties; j++) {
147 rc = device_create_file(psy->dev,
148 &power_supply_attrs[psy->properties[j]]);
149 if (rc)
150 goto dynamics_failed;
151 }
152
153 goto succeed;
154
155 dynamics_failed:
156 while (j--)
157 device_remove_file(psy->dev,
158 &power_supply_attrs[psy->properties[j]]);
159 statics_failed:
160 while (i--)
161 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
162 succeed:
163 return rc;
164 }
165
166 void power_supply_remove_attrs(struct power_supply *psy)
167 {
168 int i;
169
170 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
171 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
172
173 for (i = 0; i < psy->num_properties; i++)
174 device_remove_file(psy->dev,
175 &power_supply_attrs[psy->properties[i]]);
176 }
177
178 static char *kstruprdup(const char *str, gfp_t gfp)
179 {
180 char *ret, *ustr;
181
182 ustr = ret = kmalloc(strlen(str) + 1, gfp);
183
184 if (!ret)
185 return NULL;
186
187 while (*str)
188 *ustr++ = toupper(*str++);
189
190 *ustr = 0;
191
192 return ret;
193 }
194
195 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
196 {
197 struct power_supply *psy = dev_get_drvdata(dev);
198 int ret = 0, j;
199 char *prop_buf;
200 char *attrname;
201
202 dev_dbg(dev, "uevent\n");
203
204 if (!psy) {
205 dev_dbg(dev, "No power supply yet\n");
206 return ret;
207 }
208
209 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
210
211 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
212 if (ret)
213 return ret;
214
215 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
216 if (!prop_buf)
217 return -ENOMEM;
218
219 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
220 struct device_attribute *attr;
221 char *line;
222
223 attr = &power_supply_static_attrs[j];
224
225 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
226 if (ret < 0)
227 goto out;
228
229 line = strchr(prop_buf, '\n');
230 if (line)
231 *line = 0;
232
233 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
234 if (!attrname) {
235 ret = -ENOMEM;
236 goto out;
237 }
238
239 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
240
241 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
242 kfree(attrname);
243 if (ret)
244 goto out;
245 }
246
247 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
248
249 for (j = 0; j < psy->num_properties; j++) {
250 struct device_attribute *attr;
251 char *line;
252
253 attr = &power_supply_attrs[psy->properties[j]];
254
255 ret = power_supply_show_property(dev, attr, prop_buf);
256 if (ret == -ENODEV) {
257 /* When a battery is absent, we expect -ENODEV. Don't abort;
258 send the uevent with at least the the PRESENT=0 property */
259 ret = 0;
260 continue;
261 }
262
263 if (ret < 0)
264 goto out;
265
266 line = strchr(prop_buf, '\n');
267 if (line)
268 *line = 0;
269
270 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
271 if (!attrname) {
272 ret = -ENOMEM;
273 goto out;
274 }
275
276 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
277
278 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
279 kfree(attrname);
280 if (ret)
281 goto out;
282 }
283
284 out:
285 free_page((unsigned long)prop_buf);
286
287 return ret;
288 }
289
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