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14#include <linux/ctype.h>
15#include <linux/power_supply.h>
16
17#include "power_supply.h"
18
19
20
21
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25
26
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28
29
30
31#define POWER_SUPPLY_ATTR(_name) \
32{ \
33 .attr = { .name = #_name, .mode = 0444 }, \
34 .show = power_supply_show_property, \
35 .store = NULL, \
36}
37
38static struct device_attribute power_supply_attrs[];
39
40static 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 *charge_type[] = {
47 "Unknown", "N/A", "Trickle", "Fast"
48 };
49 static char *health_text[] = {
50 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
51 "Unspecified failure", "Cold",
52 };
53 static char *technology_text[] = {
54 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
55 "LiMn"
56 };
57 static char *capacity_level_text[] = {
58 "Unknown", "Critical", "Low", "Normal", "High", "Full"
59 };
60 ssize_t ret;
61 struct power_supply *psy = dev_get_drvdata(dev);
62 const ptrdiff_t off = attr - power_supply_attrs;
63 union power_supply_propval value;
64
65 ret = psy->get_property(psy, off, &value);
66
67 if (ret < 0) {
68 if (ret != -ENODEV)
69 dev_err(dev, "driver failed to report `%s' property\n",
70 attr->attr.name);
71 return ret;
72 }
73
74 if (off == POWER_SUPPLY_PROP_STATUS)
75 return sprintf(buf, "%s\n", status_text[value.intval]);
76 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
77 return sprintf(buf, "%s\n", charge_type[value.intval]);
78 else if (off == POWER_SUPPLY_PROP_HEALTH)
79 return sprintf(buf, "%s\n", health_text[value.intval]);
80 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
81 return sprintf(buf, "%s\n", technology_text[value.intval]);
82 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
83 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
84 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
85 return sprintf(buf, "%s\n", value.strval);
86
87 return sprintf(buf, "%d\n", value.intval);
88}
89
90
91static struct device_attribute power_supply_attrs[] = {
92
93 POWER_SUPPLY_ATTR(status),
94 POWER_SUPPLY_ATTR(charge_type),
95 POWER_SUPPLY_ATTR(health),
96 POWER_SUPPLY_ATTR(present),
97 POWER_SUPPLY_ATTR(online),
98 POWER_SUPPLY_ATTR(technology),
99 POWER_SUPPLY_ATTR(voltage_max),
100 POWER_SUPPLY_ATTR(voltage_min),
101 POWER_SUPPLY_ATTR(voltage_max_design),
102 POWER_SUPPLY_ATTR(voltage_min_design),
103 POWER_SUPPLY_ATTR(voltage_now),
104 POWER_SUPPLY_ATTR(voltage_avg),
105 POWER_SUPPLY_ATTR(current_now),
106 POWER_SUPPLY_ATTR(current_avg),
107 POWER_SUPPLY_ATTR(power_now),
108 POWER_SUPPLY_ATTR(power_avg),
109 POWER_SUPPLY_ATTR(charge_full_design),
110 POWER_SUPPLY_ATTR(charge_empty_design),
111 POWER_SUPPLY_ATTR(charge_full),
112 POWER_SUPPLY_ATTR(charge_empty),
113 POWER_SUPPLY_ATTR(charge_now),
114 POWER_SUPPLY_ATTR(charge_avg),
115 POWER_SUPPLY_ATTR(charge_counter),
116 POWER_SUPPLY_ATTR(energy_full_design),
117 POWER_SUPPLY_ATTR(energy_empty_design),
118 POWER_SUPPLY_ATTR(energy_full),
119 POWER_SUPPLY_ATTR(energy_empty),
120 POWER_SUPPLY_ATTR(energy_now),
121 POWER_SUPPLY_ATTR(energy_avg),
122 POWER_SUPPLY_ATTR(capacity),
123 POWER_SUPPLY_ATTR(capacity_level),
124 POWER_SUPPLY_ATTR(temp),
125 POWER_SUPPLY_ATTR(temp_ambient),
126 POWER_SUPPLY_ATTR(time_to_empty_now),
127 POWER_SUPPLY_ATTR(time_to_empty_avg),
128 POWER_SUPPLY_ATTR(time_to_full_now),
129 POWER_SUPPLY_ATTR(time_to_full_avg),
130
131 POWER_SUPPLY_ATTR(model_name),
132 POWER_SUPPLY_ATTR(manufacturer),
133 POWER_SUPPLY_ATTR(serial_number),
134};
135
136static ssize_t power_supply_show_static_attrs(struct device *dev,
137 struct device_attribute *attr,
138 char *buf) {
139 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
140 struct power_supply *psy = dev_get_drvdata(dev);
141
142 return sprintf(buf, "%s\n", type_text[psy->type]);
143}
144
145static struct device_attribute power_supply_static_attrs[] = {
146 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
147};
148
149int power_supply_create_attrs(struct power_supply *psy)
150{
151 int rc = 0;
152 int i, j;
153
154 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
155 rc = device_create_file(psy->dev,
156 &power_supply_static_attrs[i]);
157 if (rc)
158 goto statics_failed;
159 }
160
161 for (j = 0; j < psy->num_properties; j++) {
162 rc = device_create_file(psy->dev,
163 &power_supply_attrs[psy->properties[j]]);
164 if (rc)
165 goto dynamics_failed;
166 }
167
168 goto succeed;
169
170dynamics_failed:
171 while (j--)
172 device_remove_file(psy->dev,
173 &power_supply_attrs[psy->properties[j]]);
174statics_failed:
175 while (i--)
176 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
177succeed:
178 return rc;
179}
180
181void power_supply_remove_attrs(struct power_supply *psy)
182{
183 int i;
184
185 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
186 device_remove_file(psy->dev, &power_supply_static_attrs[i]);
187
188 for (i = 0; i < psy->num_properties; i++)
189 device_remove_file(psy->dev,
190 &power_supply_attrs[psy->properties[i]]);
191}
192
193static char *kstruprdup(const char *str, gfp_t gfp)
194{
195 char *ret, *ustr;
196
197 ustr = ret = kmalloc(strlen(str) + 1, gfp);
198
199 if (!ret)
200 return NULL;
201
202 while (*str)
203 *ustr++ = toupper(*str++);
204
205 *ustr = 0;
206
207 return ret;
208}
209
210int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
211{
212 struct power_supply *psy = dev_get_drvdata(dev);
213 int ret = 0, j;
214 char *prop_buf;
215 char *attrname;
216
217 dev_dbg(dev, "uevent\n");
218
219 if (!psy || !psy->dev) {
220 dev_dbg(dev, "No power supply yet\n");
221 return ret;
222 }
223
224 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
225
226 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
227 if (ret)
228 return ret;
229
230 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
231 if (!prop_buf)
232 return -ENOMEM;
233
234 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
235 struct device_attribute *attr;
236 char *line;
237
238 attr = &power_supply_static_attrs[j];
239
240 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
241 if (ret < 0)
242 goto out;
243
244 line = strchr(prop_buf, '\n');
245 if (line)
246 *line = 0;
247
248 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
249 if (!attrname) {
250 ret = -ENOMEM;
251 goto out;
252 }
253
254 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
255
256 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
257 kfree(attrname);
258 if (ret)
259 goto out;
260 }
261
262 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
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
273
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
299out:
300 free_page((unsigned long)prop_buf);
301
302 return ret;
303}
304
