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> |
778f523d | 17 | #include <linux/stat.h> |
4a11b59d | 18 | |
25f12141 AB |
19 | #include "power_supply.h" |
20 | ||
4a11b59d AV |
21 | /* |
22 | * This is because the name "current" breaks the device attr macro. | |
23 | * The "current" word resolves to "(get_current())" so instead of | |
24 | * "current" "(get_current())" appears in the sysfs. | |
25 | * | |
26 | * The source of this definition is the device.h which calls __ATTR | |
27 | * macro in sysfs.h which calls the __stringify macro. | |
28 | * | |
29 | * Only modification that the name is not tried to be resolved | |
30 | * (as a macro let's say). | |
31 | */ | |
32 | ||
33 | #define POWER_SUPPLY_ATTR(_name) \ | |
34 | { \ | |
5f487cd3 | 35 | .attr = { .name = #_name }, \ |
4a11b59d | 36 | .show = power_supply_show_property, \ |
0011d2d4 | 37 | .store = power_supply_store_property, \ |
4a11b59d AV |
38 | } |
39 | ||
40 | static struct device_attribute power_supply_attrs[]; | |
41 | ||
42 | static ssize_t power_supply_show_property(struct device *dev, | |
43 | struct device_attribute *attr, | |
44 | char *buf) { | |
5f487cd3 | 45 | static char *type_text[] = { |
9b887227 | 46 | "Unknown", "Battery", "UPS", "Mains", "USB", |
85efc8a1 | 47 | "USB_DCP", "USB_CDP", "USB_ACA" |
5f487cd3 | 48 | }; |
4a11b59d AV |
49 | static char *status_text[] = { |
50 | "Unknown", "Charging", "Discharging", "Not charging", "Full" | |
51 | }; | |
ee8076ed AS |
52 | static char *charge_type[] = { |
53 | "Unknown", "N/A", "Trickle", "Fast" | |
54 | }; | |
4a11b59d AV |
55 | static char *health_text[] = { |
56 | "Unknown", "Good", "Overheat", "Dead", "Over voltage", | |
7e386e6e | 57 | "Unspecified failure", "Cold", |
4a11b59d AV |
58 | }; |
59 | static char *technology_text[] = { | |
c7cc930f DES |
60 | "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", |
61 | "LiMn" | |
4a11b59d | 62 | }; |
b294a290 AS |
63 | static char *capacity_level_text[] = { |
64 | "Unknown", "Critical", "Low", "Normal", "High", "Full" | |
65 | }; | |
25a0bc2d JF |
66 | static char *scope_text[] = { |
67 | "Unknown", "System", "Device" | |
68 | }; | |
5f487cd3 | 69 | ssize_t ret = 0; |
4a11b59d AV |
70 | struct power_supply *psy = dev_get_drvdata(dev); |
71 | const ptrdiff_t off = attr - power_supply_attrs; | |
72 | union power_supply_propval value; | |
73 | ||
5f487cd3 AV |
74 | if (off == POWER_SUPPLY_PROP_TYPE) |
75 | value.intval = psy->type; | |
76 | else | |
77 | ret = psy->get_property(psy, off, &value); | |
4a11b59d AV |
78 | |
79 | if (ret < 0) { | |
9d233e8b AV |
80 | if (ret == -ENODATA) |
81 | dev_dbg(dev, "driver has no data for `%s' property\n", | |
82 | attr->attr.name); | |
83 | else if (ret != -ENODEV) | |
85b5fbf7 | 84 | dev_err(dev, "driver failed to report `%s' property: %zd\n", |
35c3ae5e | 85 | attr->attr.name, ret); |
4a11b59d AV |
86 | return ret; |
87 | } | |
88 | ||
89 | if (off == POWER_SUPPLY_PROP_STATUS) | |
90 | return sprintf(buf, "%s\n", status_text[value.intval]); | |
ee8076ed AS |
91 | else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) |
92 | return sprintf(buf, "%s\n", charge_type[value.intval]); | |
4a11b59d AV |
93 | else if (off == POWER_SUPPLY_PROP_HEALTH) |
94 | return sprintf(buf, "%s\n", health_text[value.intval]); | |
95 | else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) | |
96 | return sprintf(buf, "%s\n", technology_text[value.intval]); | |
b294a290 AS |
97 | else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) |
98 | return sprintf(buf, "%s\n", capacity_level_text[value.intval]); | |
5f487cd3 AV |
99 | else if (off == POWER_SUPPLY_PROP_TYPE) |
100 | return sprintf(buf, "%s\n", type_text[value.intval]); | |
25a0bc2d JF |
101 | else if (off == POWER_SUPPLY_PROP_SCOPE) |
102 | return sprintf(buf, "%s\n", scope_text[value.intval]); | |
4a11b59d AV |
103 | else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) |
104 | return sprintf(buf, "%s\n", value.strval); | |
105 | ||
106 | return sprintf(buf, "%d\n", value.intval); | |
107 | } | |
108 | ||
0011d2d4 DM |
109 | static ssize_t power_supply_store_property(struct device *dev, |
110 | struct device_attribute *attr, | |
111 | const char *buf, size_t count) { | |
112 | ssize_t ret; | |
113 | struct power_supply *psy = dev_get_drvdata(dev); | |
114 | const ptrdiff_t off = attr - power_supply_attrs; | |
115 | union power_supply_propval value; | |
116 | long long_val; | |
117 | ||
118 | /* TODO: support other types than int */ | |
119 | ret = strict_strtol(buf, 10, &long_val); | |
120 | if (ret < 0) | |
121 | return ret; | |
122 | ||
123 | value.intval = long_val; | |
124 | ||
125 | ret = psy->set_property(psy, off, &value); | |
126 | if (ret < 0) | |
127 | return ret; | |
128 | ||
129 | return count; | |
130 | } | |
131 | ||
4a11b59d AV |
132 | /* Must be in the same order as POWER_SUPPLY_PROP_* */ |
133 | static struct device_attribute power_supply_attrs[] = { | |
134 | /* Properties of type `int' */ | |
135 | POWER_SUPPLY_ATTR(status), | |
ee8076ed | 136 | POWER_SUPPLY_ATTR(charge_type), |
4a11b59d AV |
137 | POWER_SUPPLY_ATTR(health), |
138 | POWER_SUPPLY_ATTR(present), | |
139 | POWER_SUPPLY_ATTR(online), | |
140 | POWER_SUPPLY_ATTR(technology), | |
c955fe8e | 141 | POWER_SUPPLY_ATTR(cycle_count), |
c7cc930f DES |
142 | POWER_SUPPLY_ATTR(voltage_max), |
143 | POWER_SUPPLY_ATTR(voltage_min), | |
4a11b59d AV |
144 | POWER_SUPPLY_ATTR(voltage_max_design), |
145 | POWER_SUPPLY_ATTR(voltage_min_design), | |
146 | POWER_SUPPLY_ATTR(voltage_now), | |
147 | POWER_SUPPLY_ATTR(voltage_avg), | |
fe3f6d09 | 148 | POWER_SUPPLY_ATTR(current_max), |
4a11b59d AV |
149 | POWER_SUPPLY_ATTR(current_now), |
150 | POWER_SUPPLY_ATTR(current_avg), | |
7faa144a AS |
151 | POWER_SUPPLY_ATTR(power_now), |
152 | POWER_SUPPLY_ATTR(power_avg), | |
4a11b59d AV |
153 | POWER_SUPPLY_ATTR(charge_full_design), |
154 | POWER_SUPPLY_ATTR(charge_empty_design), | |
155 | POWER_SUPPLY_ATTR(charge_full), | |
156 | POWER_SUPPLY_ATTR(charge_empty), | |
157 | POWER_SUPPLY_ATTR(charge_now), | |
158 | POWER_SUPPLY_ATTR(charge_avg), | |
8e552c36 | 159 | POWER_SUPPLY_ATTR(charge_counter), |
4a11b59d AV |
160 | POWER_SUPPLY_ATTR(energy_full_design), |
161 | POWER_SUPPLY_ATTR(energy_empty_design), | |
162 | POWER_SUPPLY_ATTR(energy_full), | |
163 | POWER_SUPPLY_ATTR(energy_empty), | |
164 | POWER_SUPPLY_ATTR(energy_now), | |
165 | POWER_SUPPLY_ATTR(energy_avg), | |
166 | POWER_SUPPLY_ATTR(capacity), | |
b294a290 | 167 | POWER_SUPPLY_ATTR(capacity_level), |
4a11b59d AV |
168 | POWER_SUPPLY_ATTR(temp), |
169 | POWER_SUPPLY_ATTR(temp_ambient), | |
170 | POWER_SUPPLY_ATTR(time_to_empty_now), | |
171 | POWER_SUPPLY_ATTR(time_to_empty_avg), | |
172 | POWER_SUPPLY_ATTR(time_to_full_now), | |
173 | POWER_SUPPLY_ATTR(time_to_full_avg), | |
5f487cd3 | 174 | POWER_SUPPLY_ATTR(type), |
25a0bc2d | 175 | POWER_SUPPLY_ATTR(scope), |
4a11b59d AV |
176 | /* Properties of type `const char *' */ |
177 | POWER_SUPPLY_ATTR(model_name), | |
178 | POWER_SUPPLY_ATTR(manufacturer), | |
7c2670bb | 179 | POWER_SUPPLY_ATTR(serial_number), |
4a11b59d AV |
180 | }; |
181 | ||
5f487cd3 AV |
182 | static struct attribute * |
183 | __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; | |
4a11b59d | 184 | |
587a1f16 | 185 | static umode_t power_supply_attr_is_visible(struct kobject *kobj, |
5f487cd3 AV |
186 | struct attribute *attr, |
187 | int attrno) | |
4a11b59d | 188 | { |
5f487cd3 AV |
189 | struct device *dev = container_of(kobj, struct device, kobj); |
190 | struct power_supply *psy = dev_get_drvdata(dev); | |
587a1f16 | 191 | umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; |
5f487cd3 | 192 | int i; |
4a11b59d | 193 | |
bbabb158 DM |
194 | if (attrno == POWER_SUPPLY_PROP_TYPE) |
195 | return mode; | |
196 | ||
5f487cd3 | 197 | for (i = 0; i < psy->num_properties; i++) { |
0011d2d4 DM |
198 | int property = psy->properties[i]; |
199 | ||
200 | if (property == attrno) { | |
0011d2d4 DM |
201 | if (psy->property_is_writeable && |
202 | psy->property_is_writeable(psy, property) > 0) | |
203 | mode |= S_IWUSR; | |
204 | ||
205 | return mode; | |
206 | } | |
4a11b59d AV |
207 | } |
208 | ||
5f487cd3 | 209 | return 0; |
4a11b59d AV |
210 | } |
211 | ||
5f487cd3 AV |
212 | static struct attribute_group power_supply_attr_group = { |
213 | .attrs = __power_supply_attrs, | |
214 | .is_visible = power_supply_attr_is_visible, | |
215 | }; | |
216 | ||
217 | static const struct attribute_group *power_supply_attr_groups[] = { | |
218 | &power_supply_attr_group, | |
219 | NULL, | |
220 | }; | |
221 | ||
222 | void power_supply_init_attrs(struct device_type *dev_type) | |
4a11b59d AV |
223 | { |
224 | int i; | |
225 | ||
5f487cd3 | 226 | dev_type->groups = power_supply_attr_groups; |
4a11b59d | 227 | |
5f487cd3 AV |
228 | for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) |
229 | __power_supply_attrs[i] = &power_supply_attrs[i].attr; | |
4a11b59d AV |
230 | } |
231 | ||
232 | static char *kstruprdup(const char *str, gfp_t gfp) | |
233 | { | |
234 | char *ret, *ustr; | |
235 | ||
236 | ustr = ret = kmalloc(strlen(str) + 1, gfp); | |
237 | ||
238 | if (!ret) | |
239 | return NULL; | |
240 | ||
241 | while (*str) | |
242 | *ustr++ = toupper(*str++); | |
243 | ||
244 | *ustr = 0; | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
7eff2e7a | 249 | int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) |
4a11b59d AV |
250 | { |
251 | struct power_supply *psy = dev_get_drvdata(dev); | |
7eff2e7a | 252 | int ret = 0, j; |
4a11b59d AV |
253 | char *prop_buf; |
254 | char *attrname; | |
255 | ||
256 | dev_dbg(dev, "uevent\n"); | |
257 | ||
56fa18e8 | 258 | if (!psy || !psy->dev) { |
4a11b59d AV |
259 | dev_dbg(dev, "No power supply yet\n"); |
260 | return ret; | |
261 | } | |
262 | ||
263 | dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); | |
264 | ||
7eff2e7a | 265 | ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); |
4a11b59d AV |
266 | if (ret) |
267 | return ret; | |
268 | ||
269 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); | |
270 | if (!prop_buf) | |
271 | return -ENOMEM; | |
272 | ||
4a11b59d AV |
273 | for (j = 0; j < psy->num_properties; j++) { |
274 | struct device_attribute *attr; | |
275 | char *line; | |
276 | ||
277 | attr = &power_supply_attrs[psy->properties[j]]; | |
278 | ||
279 | ret = power_supply_show_property(dev, attr, prop_buf); | |
f722e17f | 280 | if (ret == -ENODEV || ret == -ENODATA) { |
4a11b59d AV |
281 | /* When a battery is absent, we expect -ENODEV. Don't abort; |
282 | send the uevent with at least the the PRESENT=0 property */ | |
283 | ret = 0; | |
284 | continue; | |
285 | } | |
286 | ||
287 | if (ret < 0) | |
288 | goto out; | |
289 | ||
290 | line = strchr(prop_buf, '\n'); | |
291 | if (line) | |
292 | *line = 0; | |
293 | ||
294 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
295 | if (!attrname) { | |
296 | ret = -ENOMEM; | |
297 | goto out; | |
298 | } | |
299 | ||
300 | dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); | |
301 | ||
7eff2e7a | 302 | ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); |
4a11b59d AV |
303 | kfree(attrname); |
304 | if (ret) | |
305 | goto out; | |
306 | } | |
307 | ||
308 | out: | |
309 | free_page((unsigned long)prop_buf); | |
310 | ||
311 | return ret; | |
312 | } |