Commit | Line | Data |
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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 | { \ | |
5f487cd3 | 34 | .attr = { .name = #_name }, \ |
4a11b59d | 35 | .show = power_supply_show_property, \ |
0011d2d4 | 36 | .store = power_supply_store_property, \ |
4a11b59d AV |
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) { | |
5f487cd3 AV |
44 | static char *type_text[] = { |
45 | "Battery", "UPS", "Mains", "USB" | |
46 | }; | |
4a11b59d AV |
47 | static char *status_text[] = { |
48 | "Unknown", "Charging", "Discharging", "Not charging", "Full" | |
49 | }; | |
ee8076ed AS |
50 | static char *charge_type[] = { |
51 | "Unknown", "N/A", "Trickle", "Fast" | |
52 | }; | |
4a11b59d AV |
53 | static char *health_text[] = { |
54 | "Unknown", "Good", "Overheat", "Dead", "Over voltage", | |
7e386e6e | 55 | "Unspecified failure", "Cold", |
4a11b59d AV |
56 | }; |
57 | static char *technology_text[] = { | |
c7cc930f DB |
58 | "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", |
59 | "LiMn" | |
4a11b59d | 60 | }; |
b294a290 AS |
61 | static char *capacity_level_text[] = { |
62 | "Unknown", "Critical", "Low", "Normal", "High", "Full" | |
63 | }; | |
5f487cd3 | 64 | ssize_t ret = 0; |
4a11b59d AV |
65 | struct power_supply *psy = dev_get_drvdata(dev); |
66 | const ptrdiff_t off = attr - power_supply_attrs; | |
67 | union power_supply_propval value; | |
68 | ||
5f487cd3 AV |
69 | if (off == POWER_SUPPLY_PROP_TYPE) |
70 | value.intval = psy->type; | |
71 | else | |
72 | ret = psy->get_property(psy, off, &value); | |
4a11b59d AV |
73 | |
74 | if (ret < 0) { | |
9d233e8b AV |
75 | if (ret == -ENODATA) |
76 | dev_dbg(dev, "driver has no data for `%s' property\n", | |
77 | attr->attr.name); | |
78 | else if (ret != -ENODEV) | |
4a11b59d AV |
79 | dev_err(dev, "driver failed to report `%s' property\n", |
80 | attr->attr.name); | |
81 | return ret; | |
82 | } | |
83 | ||
84 | if (off == POWER_SUPPLY_PROP_STATUS) | |
85 | return sprintf(buf, "%s\n", status_text[value.intval]); | |
ee8076ed AS |
86 | else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) |
87 | return sprintf(buf, "%s\n", charge_type[value.intval]); | |
4a11b59d AV |
88 | else if (off == POWER_SUPPLY_PROP_HEALTH) |
89 | return sprintf(buf, "%s\n", health_text[value.intval]); | |
90 | else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) | |
91 | return sprintf(buf, "%s\n", technology_text[value.intval]); | |
b294a290 AS |
92 | else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) |
93 | return sprintf(buf, "%s\n", capacity_level_text[value.intval]); | |
5f487cd3 AV |
94 | else if (off == POWER_SUPPLY_PROP_TYPE) |
95 | return sprintf(buf, "%s\n", type_text[value.intval]); | |
4a11b59d AV |
96 | else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) |
97 | return sprintf(buf, "%s\n", value.strval); | |
98 | ||
99 | return sprintf(buf, "%d\n", value.intval); | |
100 | } | |
101 | ||
0011d2d4 DM |
102 | static ssize_t power_supply_store_property(struct device *dev, |
103 | struct device_attribute *attr, | |
104 | const char *buf, size_t count) { | |
105 | ssize_t ret; | |
106 | struct power_supply *psy = dev_get_drvdata(dev); | |
107 | const ptrdiff_t off = attr - power_supply_attrs; | |
108 | union power_supply_propval value; | |
109 | long long_val; | |
110 | ||
111 | /* TODO: support other types than int */ | |
112 | ret = strict_strtol(buf, 10, &long_val); | |
113 | if (ret < 0) | |
114 | return ret; | |
115 | ||
116 | value.intval = long_val; | |
117 | ||
118 | ret = psy->set_property(psy, off, &value); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | return count; | |
123 | } | |
124 | ||
4a11b59d AV |
125 | /* Must be in the same order as POWER_SUPPLY_PROP_* */ |
126 | static struct device_attribute power_supply_attrs[] = { | |
127 | /* Properties of type `int' */ | |
128 | POWER_SUPPLY_ATTR(status), | |
ee8076ed | 129 | POWER_SUPPLY_ATTR(charge_type), |
4a11b59d AV |
130 | POWER_SUPPLY_ATTR(health), |
131 | POWER_SUPPLY_ATTR(present), | |
132 | POWER_SUPPLY_ATTR(online), | |
133 | POWER_SUPPLY_ATTR(technology), | |
c955fe8e | 134 | POWER_SUPPLY_ATTR(cycle_count), |
c7cc930f DB |
135 | POWER_SUPPLY_ATTR(voltage_max), |
136 | POWER_SUPPLY_ATTR(voltage_min), | |
4a11b59d AV |
137 | POWER_SUPPLY_ATTR(voltage_max_design), |
138 | POWER_SUPPLY_ATTR(voltage_min_design), | |
139 | POWER_SUPPLY_ATTR(voltage_now), | |
140 | POWER_SUPPLY_ATTR(voltage_avg), | |
141 | POWER_SUPPLY_ATTR(current_now), | |
142 | POWER_SUPPLY_ATTR(current_avg), | |
7faa144a AS |
143 | POWER_SUPPLY_ATTR(power_now), |
144 | POWER_SUPPLY_ATTR(power_avg), | |
4a11b59d AV |
145 | POWER_SUPPLY_ATTR(charge_full_design), |
146 | POWER_SUPPLY_ATTR(charge_empty_design), | |
147 | POWER_SUPPLY_ATTR(charge_full), | |
148 | POWER_SUPPLY_ATTR(charge_empty), | |
149 | POWER_SUPPLY_ATTR(charge_now), | |
150 | POWER_SUPPLY_ATTR(charge_avg), | |
8e552c36 | 151 | POWER_SUPPLY_ATTR(charge_counter), |
4a11b59d AV |
152 | POWER_SUPPLY_ATTR(energy_full_design), |
153 | POWER_SUPPLY_ATTR(energy_empty_design), | |
154 | POWER_SUPPLY_ATTR(energy_full), | |
155 | POWER_SUPPLY_ATTR(energy_empty), | |
156 | POWER_SUPPLY_ATTR(energy_now), | |
157 | POWER_SUPPLY_ATTR(energy_avg), | |
158 | POWER_SUPPLY_ATTR(capacity), | |
b294a290 | 159 | POWER_SUPPLY_ATTR(capacity_level), |
4a11b59d AV |
160 | POWER_SUPPLY_ATTR(temp), |
161 | POWER_SUPPLY_ATTR(temp_ambient), | |
162 | POWER_SUPPLY_ATTR(time_to_empty_now), | |
163 | POWER_SUPPLY_ATTR(time_to_empty_avg), | |
164 | POWER_SUPPLY_ATTR(time_to_full_now), | |
165 | POWER_SUPPLY_ATTR(time_to_full_avg), | |
5f487cd3 | 166 | POWER_SUPPLY_ATTR(type), |
4a11b59d AV |
167 | /* Properties of type `const char *' */ |
168 | POWER_SUPPLY_ATTR(model_name), | |
169 | POWER_SUPPLY_ATTR(manufacturer), | |
7c2670bb | 170 | POWER_SUPPLY_ATTR(serial_number), |
4a11b59d AV |
171 | }; |
172 | ||
5f487cd3 AV |
173 | static struct attribute * |
174 | __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; | |
4a11b59d | 175 | |
5f487cd3 AV |
176 | static mode_t power_supply_attr_is_visible(struct kobject *kobj, |
177 | struct attribute *attr, | |
178 | int attrno) | |
4a11b59d | 179 | { |
5f487cd3 AV |
180 | struct device *dev = container_of(kobj, struct device, kobj); |
181 | struct power_supply *psy = dev_get_drvdata(dev); | |
bbabb158 | 182 | mode_t mode = S_IRUSR | S_IRGRP | S_IROTH; |
5f487cd3 | 183 | int i; |
4a11b59d | 184 | |
bbabb158 DM |
185 | if (attrno == POWER_SUPPLY_PROP_TYPE) |
186 | return mode; | |
187 | ||
5f487cd3 | 188 | for (i = 0; i < psy->num_properties; i++) { |
0011d2d4 DM |
189 | int property = psy->properties[i]; |
190 | ||
191 | if (property == attrno) { | |
0011d2d4 DM |
192 | if (psy->property_is_writeable && |
193 | psy->property_is_writeable(psy, property) > 0) | |
194 | mode |= S_IWUSR; | |
195 | ||
196 | return mode; | |
197 | } | |
4a11b59d AV |
198 | } |
199 | ||
5f487cd3 | 200 | return 0; |
4a11b59d AV |
201 | } |
202 | ||
5f487cd3 AV |
203 | static struct attribute_group power_supply_attr_group = { |
204 | .attrs = __power_supply_attrs, | |
205 | .is_visible = power_supply_attr_is_visible, | |
206 | }; | |
207 | ||
208 | static const struct attribute_group *power_supply_attr_groups[] = { | |
209 | &power_supply_attr_group, | |
210 | NULL, | |
211 | }; | |
212 | ||
213 | void power_supply_init_attrs(struct device_type *dev_type) | |
4a11b59d AV |
214 | { |
215 | int i; | |
216 | ||
5f487cd3 | 217 | dev_type->groups = power_supply_attr_groups; |
4a11b59d | 218 | |
5f487cd3 AV |
219 | for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) |
220 | __power_supply_attrs[i] = &power_supply_attrs[i].attr; | |
4a11b59d AV |
221 | } |
222 | ||
223 | static char *kstruprdup(const char *str, gfp_t gfp) | |
224 | { | |
225 | char *ret, *ustr; | |
226 | ||
227 | ustr = ret = kmalloc(strlen(str) + 1, gfp); | |
228 | ||
229 | if (!ret) | |
230 | return NULL; | |
231 | ||
232 | while (*str) | |
233 | *ustr++ = toupper(*str++); | |
234 | ||
235 | *ustr = 0; | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
7eff2e7a | 240 | int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) |
4a11b59d AV |
241 | { |
242 | struct power_supply *psy = dev_get_drvdata(dev); | |
7eff2e7a | 243 | int ret = 0, j; |
4a11b59d AV |
244 | char *prop_buf; |
245 | char *attrname; | |
246 | ||
247 | dev_dbg(dev, "uevent\n"); | |
248 | ||
56fa18e8 | 249 | if (!psy || !psy->dev) { |
4a11b59d AV |
250 | dev_dbg(dev, "No power supply yet\n"); |
251 | return ret; | |
252 | } | |
253 | ||
254 | dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); | |
255 | ||
7eff2e7a | 256 | ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); |
4a11b59d AV |
257 | if (ret) |
258 | return ret; | |
259 | ||
260 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); | |
261 | if (!prop_buf) | |
262 | return -ENOMEM; | |
263 | ||
4a11b59d AV |
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 | /* When a battery is absent, we expect -ENODEV. Don't abort; | |
273 | send the uevent with at least the the PRESENT=0 property */ | |
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 | ||
7eff2e7a | 293 | ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); |
4a11b59d AV |
294 | kfree(attrname); |
295 | if (ret) | |
296 | goto out; | |
297 | } | |
298 | ||
299 | out: | |
300 | free_page((unsigned long)prop_buf); | |
301 | ||
302 | return ret; | |
303 | } |