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4a11b59d AV |
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 | /* | |
18 | * This is because the name "current" breaks the device attr macro. | |
19 | * The "current" word resolves to "(get_current())" so instead of | |
20 | * "current" "(get_current())" appears in the sysfs. | |
21 | * | |
22 | * The source of this definition is the device.h which calls __ATTR | |
23 | * macro in sysfs.h which calls the __stringify macro. | |
24 | * | |
25 | * Only modification that the name is not tried to be resolved | |
26 | * (as a macro let's say). | |
27 | */ | |
28 | ||
29 | #define POWER_SUPPLY_ATTR(_name) \ | |
30 | { \ | |
31 | .attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \ | |
32 | .show = power_supply_show_property, \ | |
33 | .store = NULL, \ | |
34 | } | |
35 | ||
36 | static struct device_attribute power_supply_attrs[]; | |
37 | ||
38 | static ssize_t power_supply_show_property(struct device *dev, | |
39 | struct device_attribute *attr, | |
40 | char *buf) { | |
41 | static char *status_text[] = { | |
42 | "Unknown", "Charging", "Discharging", "Not charging", "Full" | |
43 | }; | |
44 | static char *health_text[] = { | |
45 | "Unknown", "Good", "Overheat", "Dead", "Over voltage", | |
46 | "Unspecified failure" | |
47 | }; | |
48 | static char *technology_text[] = { | |
49 | "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd" | |
50 | }; | |
51 | static char *capacity_level_text[] = { | |
52 | "Unknown", "Critical", "Low", "Normal", "High", "Full" | |
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_CAPACITY_LEVEL) | |
75 | return sprintf(buf, "%s\n", | |
76 | capacity_level_text[value.intval]); | |
77 | else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) | |
78 | return sprintf(buf, "%s\n", value.strval); | |
79 | ||
80 | return sprintf(buf, "%d\n", value.intval); | |
81 | } | |
82 | ||
83 | /* Must be in the same order as POWER_SUPPLY_PROP_* */ | |
84 | static struct device_attribute power_supply_attrs[] = { | |
85 | /* Properties of type `int' */ | |
86 | POWER_SUPPLY_ATTR(status), | |
87 | POWER_SUPPLY_ATTR(health), | |
88 | POWER_SUPPLY_ATTR(present), | |
89 | POWER_SUPPLY_ATTR(online), | |
90 | POWER_SUPPLY_ATTR(technology), | |
91 | POWER_SUPPLY_ATTR(voltage_max_design), | |
92 | POWER_SUPPLY_ATTR(voltage_min_design), | |
93 | POWER_SUPPLY_ATTR(voltage_now), | |
94 | POWER_SUPPLY_ATTR(voltage_avg), | |
95 | POWER_SUPPLY_ATTR(current_now), | |
96 | POWER_SUPPLY_ATTR(current_avg), | |
97 | POWER_SUPPLY_ATTR(charge_full_design), | |
98 | POWER_SUPPLY_ATTR(charge_empty_design), | |
99 | POWER_SUPPLY_ATTR(charge_full), | |
100 | POWER_SUPPLY_ATTR(charge_empty), | |
101 | POWER_SUPPLY_ATTR(charge_now), | |
102 | POWER_SUPPLY_ATTR(charge_avg), | |
103 | POWER_SUPPLY_ATTR(energy_full_design), | |
104 | POWER_SUPPLY_ATTR(energy_empty_design), | |
105 | POWER_SUPPLY_ATTR(energy_full), | |
106 | POWER_SUPPLY_ATTR(energy_empty), | |
107 | POWER_SUPPLY_ATTR(energy_now), | |
108 | POWER_SUPPLY_ATTR(energy_avg), | |
109 | POWER_SUPPLY_ATTR(capacity), | |
110 | POWER_SUPPLY_ATTR(capacity_level), | |
111 | POWER_SUPPLY_ATTR(temp), | |
112 | POWER_SUPPLY_ATTR(temp_ambient), | |
113 | POWER_SUPPLY_ATTR(time_to_empty_now), | |
114 | POWER_SUPPLY_ATTR(time_to_empty_avg), | |
115 | POWER_SUPPLY_ATTR(time_to_full_now), | |
116 | POWER_SUPPLY_ATTR(time_to_full_avg), | |
117 | /* Properties of type `const char *' */ | |
118 | POWER_SUPPLY_ATTR(model_name), | |
119 | POWER_SUPPLY_ATTR(manufacturer), | |
120 | }; | |
121 | ||
122 | static ssize_t power_supply_show_static_attrs(struct device *dev, | |
123 | struct device_attribute *attr, | |
124 | char *buf) { | |
125 | static char *type_text[] = { "Battery", "UPS", "Mains", "USB" }; | |
126 | struct power_supply *psy = dev_get_drvdata(dev); | |
127 | ||
128 | return sprintf(buf, "%s\n", type_text[psy->type]); | |
129 | } | |
130 | ||
131 | static struct device_attribute power_supply_static_attrs[] = { | |
132 | __ATTR(type, 0444, power_supply_show_static_attrs, NULL), | |
133 | }; | |
134 | ||
135 | int power_supply_create_attrs(struct power_supply *psy) | |
136 | { | |
137 | int rc = 0; | |
138 | int i, j; | |
139 | ||
140 | for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) { | |
141 | rc = device_create_file(psy->dev, | |
142 | &power_supply_static_attrs[i]); | |
143 | if (rc) | |
144 | goto statics_failed; | |
145 | } | |
146 | ||
147 | for (j = 0; j < psy->num_properties; j++) { | |
148 | rc = device_create_file(psy->dev, | |
149 | &power_supply_attrs[psy->properties[j]]); | |
150 | if (rc) | |
151 | goto dynamics_failed; | |
152 | } | |
153 | ||
154 | goto succeed; | |
155 | ||
156 | dynamics_failed: | |
157 | while (j--) | |
158 | device_remove_file(psy->dev, | |
159 | &power_supply_attrs[psy->properties[j]]); | |
160 | statics_failed: | |
161 | while (i--) | |
162 | device_remove_file(psy->dev, | |
163 | &power_supply_static_attrs[psy->properties[i]]); | |
164 | succeed: | |
165 | return rc; | |
166 | } | |
167 | ||
168 | void power_supply_remove_attrs(struct power_supply *psy) | |
169 | { | |
170 | int i; | |
171 | ||
172 | for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) | |
173 | device_remove_file(psy->dev, | |
174 | &power_supply_static_attrs[i]); | |
175 | ||
176 | for (i = 0; i < psy->num_properties; i++) | |
177 | device_remove_file(psy->dev, | |
178 | &power_supply_attrs[psy->properties[i]]); | |
179 | ||
180 | return; | |
181 | } | |
182 | ||
183 | static char *kstruprdup(const char *str, gfp_t gfp) | |
184 | { | |
185 | char *ret, *ustr; | |
186 | ||
187 | ustr = ret = kmalloc(strlen(str) + 1, gfp); | |
188 | ||
189 | if (!ret) | |
190 | return NULL; | |
191 | ||
192 | while (*str) | |
193 | *ustr++ = toupper(*str++); | |
194 | ||
195 | *ustr = 0; | |
196 | ||
197 | return ret; | |
198 | } | |
199 | ||
200 | int power_supply_uevent(struct device *dev, char **envp, int num_envp, | |
201 | char *buffer, int buffer_size) | |
202 | { | |
203 | struct power_supply *psy = dev_get_drvdata(dev); | |
204 | int i = 0, length = 0, ret = 0, j; | |
205 | char *prop_buf; | |
206 | char *attrname; | |
207 | ||
208 | dev_dbg(dev, "uevent\n"); | |
209 | ||
210 | if (!psy) { | |
211 | dev_dbg(dev, "No power supply yet\n"); | |
212 | return ret; | |
213 | } | |
214 | ||
215 | dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); | |
216 | ||
217 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, | |
218 | &length, "POWER_SUPPLY_NAME=%s", psy->name); | |
219 | if (ret) | |
220 | return ret; | |
221 | ||
222 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); | |
223 | if (!prop_buf) | |
224 | return -ENOMEM; | |
225 | ||
226 | for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) { | |
227 | struct device_attribute *attr; | |
228 | char *line; | |
229 | ||
230 | attr = &power_supply_static_attrs[j]; | |
231 | ||
232 | ret = power_supply_show_static_attrs(dev, attr, prop_buf); | |
233 | if (ret < 0) | |
234 | goto out; | |
235 | ||
236 | line = strchr(prop_buf, '\n'); | |
237 | if (line) | |
238 | *line = 0; | |
239 | ||
240 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
241 | if (!attrname) { | |
242 | ret = -ENOMEM; | |
243 | goto out; | |
244 | } | |
245 | ||
246 | dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf); | |
247 | ||
248 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, | |
249 | &length, "POWER_SUPPLY_%s=%s", | |
250 | attrname, prop_buf); | |
251 | kfree(attrname); | |
252 | if (ret) | |
253 | goto out; | |
254 | } | |
255 | ||
256 | dev_dbg(dev, "%zd dynamic props\n", psy->num_properties); | |
257 | ||
258 | for (j = 0; j < psy->num_properties; j++) { | |
259 | struct device_attribute *attr; | |
260 | char *line; | |
261 | ||
262 | attr = &power_supply_attrs[psy->properties[j]]; | |
263 | ||
264 | ret = power_supply_show_property(dev, attr, prop_buf); | |
265 | if (ret == -ENODEV) { | |
266 | /* When a battery is absent, we expect -ENODEV. Don't abort; | |
267 | send the uevent with at least the the PRESENT=0 property */ | |
268 | ret = 0; | |
269 | continue; | |
270 | } | |
271 | ||
272 | if (ret < 0) | |
273 | goto out; | |
274 | ||
275 | line = strchr(prop_buf, '\n'); | |
276 | if (line) | |
277 | *line = 0; | |
278 | ||
279 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
280 | if (!attrname) { | |
281 | ret = -ENOMEM; | |
282 | goto out; | |
283 | } | |
284 | ||
285 | dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); | |
286 | ||
287 | ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, | |
288 | &length, "POWER_SUPPLY_%s=%s", | |
289 | attrname, prop_buf); | |
290 | kfree(attrname); | |
291 | if (ret) | |
292 | goto out; | |
293 | } | |
294 | ||
295 | out: | |
296 | free_page((unsigned long)prop_buf); | |
297 | ||
298 | return ret; | |
299 | } |