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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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
4a11b59d | 17 | |
25f12141 AB |
18 | #include "power_supply.h" |
19 | ||
4a11b59d AV |
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 | { \ | |
01e8ef11 | 34 | .attr = { .name = #_name, .mode = 0444 }, \ |
4a11b59d AV |
35 | .show = power_supply_show_property, \ |
36 | .store = NULL, \ | |
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 *status_text[] = { | |
45 | "Unknown", "Charging", "Discharging", "Not charging", "Full" | |
46 | }; | |
ee8076ed AS |
47 | static char *charge_type[] = { |
48 | "Unknown", "N/A", "Trickle", "Fast" | |
49 | }; | |
4a11b59d AV |
50 | static char *health_text[] = { |
51 | "Unknown", "Good", "Overheat", "Dead", "Over voltage", | |
7e386e6e | 52 | "Unspecified failure", "Cold", |
4a11b59d AV |
53 | }; |
54 | static char *technology_text[] = { | |
c7cc930f DES |
55 | "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", |
56 | "LiMn" | |
4a11b59d | 57 | }; |
b294a290 AS |
58 | static char *capacity_level_text[] = { |
59 | "Unknown", "Critical", "Low", "Normal", "High", "Full" | |
60 | }; | |
4a11b59d AV |
61 | ssize_t ret; |
62 | struct power_supply *psy = dev_get_drvdata(dev); | |
63 | const ptrdiff_t off = attr - power_supply_attrs; | |
64 | union power_supply_propval value; | |
65 | ||
66 | ret = psy->get_property(psy, off, &value); | |
67 | ||
68 | if (ret < 0) { | |
9d233e8b AV |
69 | if (ret == -ENODATA) |
70 | dev_dbg(dev, "driver has no data for `%s' property\n", | |
71 | attr->attr.name); | |
72 | else if (ret != -ENODEV) | |
4a11b59d AV |
73 | dev_err(dev, "driver failed to report `%s' property\n", |
74 | attr->attr.name); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | if (off == POWER_SUPPLY_PROP_STATUS) | |
79 | return sprintf(buf, "%s\n", status_text[value.intval]); | |
ee8076ed AS |
80 | else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) |
81 | return sprintf(buf, "%s\n", charge_type[value.intval]); | |
4a11b59d AV |
82 | else if (off == POWER_SUPPLY_PROP_HEALTH) |
83 | return sprintf(buf, "%s\n", health_text[value.intval]); | |
84 | else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) | |
85 | return sprintf(buf, "%s\n", technology_text[value.intval]); | |
b294a290 AS |
86 | else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) |
87 | return sprintf(buf, "%s\n", capacity_level_text[value.intval]); | |
4a11b59d AV |
88 | else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) |
89 | return sprintf(buf, "%s\n", value.strval); | |
90 | ||
91 | return sprintf(buf, "%d\n", value.intval); | |
92 | } | |
93 | ||
94 | /* Must be in the same order as POWER_SUPPLY_PROP_* */ | |
95 | static struct device_attribute power_supply_attrs[] = { | |
96 | /* Properties of type `int' */ | |
97 | POWER_SUPPLY_ATTR(status), | |
ee8076ed | 98 | POWER_SUPPLY_ATTR(charge_type), |
4a11b59d AV |
99 | POWER_SUPPLY_ATTR(health), |
100 | POWER_SUPPLY_ATTR(present), | |
101 | POWER_SUPPLY_ATTR(online), | |
102 | POWER_SUPPLY_ATTR(technology), | |
c955fe8e | 103 | POWER_SUPPLY_ATTR(cycle_count), |
c7cc930f DES |
104 | POWER_SUPPLY_ATTR(voltage_max), |
105 | POWER_SUPPLY_ATTR(voltage_min), | |
4a11b59d AV |
106 | POWER_SUPPLY_ATTR(voltage_max_design), |
107 | POWER_SUPPLY_ATTR(voltage_min_design), | |
108 | POWER_SUPPLY_ATTR(voltage_now), | |
109 | POWER_SUPPLY_ATTR(voltage_avg), | |
110 | POWER_SUPPLY_ATTR(current_now), | |
111 | POWER_SUPPLY_ATTR(current_avg), | |
7faa144a AS |
112 | POWER_SUPPLY_ATTR(power_now), |
113 | POWER_SUPPLY_ATTR(power_avg), | |
4a11b59d AV |
114 | POWER_SUPPLY_ATTR(charge_full_design), |
115 | POWER_SUPPLY_ATTR(charge_empty_design), | |
116 | POWER_SUPPLY_ATTR(charge_full), | |
117 | POWER_SUPPLY_ATTR(charge_empty), | |
118 | POWER_SUPPLY_ATTR(charge_now), | |
119 | POWER_SUPPLY_ATTR(charge_avg), | |
8e552c36 | 120 | POWER_SUPPLY_ATTR(charge_counter), |
4a11b59d AV |
121 | POWER_SUPPLY_ATTR(energy_full_design), |
122 | POWER_SUPPLY_ATTR(energy_empty_design), | |
123 | POWER_SUPPLY_ATTR(energy_full), | |
124 | POWER_SUPPLY_ATTR(energy_empty), | |
125 | POWER_SUPPLY_ATTR(energy_now), | |
126 | POWER_SUPPLY_ATTR(energy_avg), | |
127 | POWER_SUPPLY_ATTR(capacity), | |
b294a290 | 128 | POWER_SUPPLY_ATTR(capacity_level), |
4a11b59d AV |
129 | POWER_SUPPLY_ATTR(temp), |
130 | POWER_SUPPLY_ATTR(temp_ambient), | |
131 | POWER_SUPPLY_ATTR(time_to_empty_now), | |
132 | POWER_SUPPLY_ATTR(time_to_empty_avg), | |
133 | POWER_SUPPLY_ATTR(time_to_full_now), | |
134 | POWER_SUPPLY_ATTR(time_to_full_avg), | |
135 | /* Properties of type `const char *' */ | |
136 | POWER_SUPPLY_ATTR(model_name), | |
137 | POWER_SUPPLY_ATTR(manufacturer), | |
7c2670bb | 138 | POWER_SUPPLY_ATTR(serial_number), |
4a11b59d AV |
139 | }; |
140 | ||
141 | static ssize_t power_supply_show_static_attrs(struct device *dev, | |
142 | struct device_attribute *attr, | |
143 | char *buf) { | |
144 | static char *type_text[] = { "Battery", "UPS", "Mains", "USB" }; | |
145 | struct power_supply *psy = dev_get_drvdata(dev); | |
146 | ||
147 | return sprintf(buf, "%s\n", type_text[psy->type]); | |
148 | } | |
149 | ||
150 | static struct device_attribute power_supply_static_attrs[] = { | |
151 | __ATTR(type, 0444, power_supply_show_static_attrs, NULL), | |
152 | }; | |
153 | ||
154 | int power_supply_create_attrs(struct power_supply *psy) | |
155 | { | |
156 | int rc = 0; | |
157 | int i, j; | |
158 | ||
159 | for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) { | |
160 | rc = device_create_file(psy->dev, | |
161 | &power_supply_static_attrs[i]); | |
162 | if (rc) | |
163 | goto statics_failed; | |
164 | } | |
165 | ||
166 | for (j = 0; j < psy->num_properties; j++) { | |
167 | rc = device_create_file(psy->dev, | |
168 | &power_supply_attrs[psy->properties[j]]); | |
169 | if (rc) | |
170 | goto dynamics_failed; | |
171 | } | |
172 | ||
173 | goto succeed; | |
174 | ||
175 | dynamics_failed: | |
176 | while (j--) | |
177 | device_remove_file(psy->dev, | |
178 | &power_supply_attrs[psy->properties[j]]); | |
179 | statics_failed: | |
180 | while (i--) | |
839dc9f1 | 181 | device_remove_file(psy->dev, &power_supply_static_attrs[i]); |
4a11b59d AV |
182 | succeed: |
183 | return rc; | |
184 | } | |
185 | ||
186 | void power_supply_remove_attrs(struct power_supply *psy) | |
187 | { | |
188 | int i; | |
189 | ||
190 | for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) | |
839dc9f1 | 191 | device_remove_file(psy->dev, &power_supply_static_attrs[i]); |
4a11b59d AV |
192 | |
193 | for (i = 0; i < psy->num_properties; i++) | |
194 | device_remove_file(psy->dev, | |
195 | &power_supply_attrs[psy->properties[i]]); | |
4a11b59d AV |
196 | } |
197 | ||
198 | static char *kstruprdup(const char *str, gfp_t gfp) | |
199 | { | |
200 | char *ret, *ustr; | |
201 | ||
202 | ustr = ret = kmalloc(strlen(str) + 1, gfp); | |
203 | ||
204 | if (!ret) | |
205 | return NULL; | |
206 | ||
207 | while (*str) | |
208 | *ustr++ = toupper(*str++); | |
209 | ||
210 | *ustr = 0; | |
211 | ||
212 | return ret; | |
213 | } | |
214 | ||
7eff2e7a | 215 | int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) |
4a11b59d AV |
216 | { |
217 | struct power_supply *psy = dev_get_drvdata(dev); | |
7eff2e7a | 218 | int ret = 0, j; |
4a11b59d AV |
219 | char *prop_buf; |
220 | char *attrname; | |
221 | ||
222 | dev_dbg(dev, "uevent\n"); | |
223 | ||
56fa18e8 | 224 | if (!psy || !psy->dev) { |
4a11b59d AV |
225 | dev_dbg(dev, "No power supply yet\n"); |
226 | return ret; | |
227 | } | |
228 | ||
229 | dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); | |
230 | ||
7eff2e7a | 231 | ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); |
4a11b59d AV |
232 | if (ret) |
233 | return ret; | |
234 | ||
235 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); | |
236 | if (!prop_buf) | |
237 | return -ENOMEM; | |
238 | ||
239 | for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) { | |
240 | struct device_attribute *attr; | |
241 | char *line; | |
242 | ||
243 | attr = &power_supply_static_attrs[j]; | |
244 | ||
245 | ret = power_supply_show_static_attrs(dev, attr, prop_buf); | |
246 | if (ret < 0) | |
247 | goto out; | |
248 | ||
249 | line = strchr(prop_buf, '\n'); | |
250 | if (line) | |
251 | *line = 0; | |
252 | ||
253 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
254 | if (!attrname) { | |
255 | ret = -ENOMEM; | |
256 | goto out; | |
257 | } | |
258 | ||
259 | dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf); | |
260 | ||
7eff2e7a | 261 | ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); |
4a11b59d AV |
262 | kfree(attrname); |
263 | if (ret) | |
264 | goto out; | |
265 | } | |
266 | ||
267 | dev_dbg(dev, "%zd dynamic props\n", psy->num_properties); | |
268 | ||
269 | for (j = 0; j < psy->num_properties; j++) { | |
270 | struct device_attribute *attr; | |
271 | char *line; | |
272 | ||
273 | attr = &power_supply_attrs[psy->properties[j]]; | |
274 | ||
275 | ret = power_supply_show_property(dev, attr, prop_buf); | |
276 | if (ret == -ENODEV) { | |
277 | /* When a battery is absent, we expect -ENODEV. Don't abort; | |
278 | send the uevent with at least the the PRESENT=0 property */ | |
279 | ret = 0; | |
280 | continue; | |
281 | } | |
282 | ||
283 | if (ret < 0) | |
284 | goto out; | |
285 | ||
286 | line = strchr(prop_buf, '\n'); | |
287 | if (line) | |
288 | *line = 0; | |
289 | ||
290 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
291 | if (!attrname) { | |
292 | ret = -ENOMEM; | |
293 | goto out; | |
294 | } | |
295 | ||
296 | dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); | |
297 | ||
7eff2e7a | 298 | ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); |
4a11b59d AV |
299 | kfree(attrname); |
300 | if (ret) | |
301 | goto out; | |
302 | } | |
303 | ||
304 | out: | |
305 | free_page((unsigned long)prop_buf); | |
306 | ||
307 | return ret; | |
308 | } |