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> | |
51990e82 | 15 | #include <linux/device.h> |
4a11b59d | 16 | #include <linux/power_supply.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
778f523d | 18 | #include <linux/stat.h> |
4a11b59d | 19 | |
25f12141 AB |
20 | #include "power_supply.h" |
21 | ||
4a11b59d AV |
22 | /* |
23 | * This is because the name "current" breaks the device attr macro. | |
24 | * The "current" word resolves to "(get_current())" so instead of | |
25 | * "current" "(get_current())" appears in the sysfs. | |
26 | * | |
27 | * The source of this definition is the device.h which calls __ATTR | |
28 | * macro in sysfs.h which calls the __stringify macro. | |
29 | * | |
30 | * Only modification that the name is not tried to be resolved | |
31 | * (as a macro let's say). | |
32 | */ | |
33 | ||
34 | #define POWER_SUPPLY_ATTR(_name) \ | |
35 | { \ | |
5f487cd3 | 36 | .attr = { .name = #_name }, \ |
4a11b59d | 37 | .show = power_supply_show_property, \ |
0011d2d4 | 38 | .store = power_supply_store_property, \ |
4a11b59d AV |
39 | } |
40 | ||
41 | static struct device_attribute power_supply_attrs[]; | |
42 | ||
43 | static ssize_t power_supply_show_property(struct device *dev, | |
44 | struct device_attribute *attr, | |
45 | char *buf) { | |
5f487cd3 | 46 | static char *type_text[] = { |
9b887227 | 47 | "Unknown", "Battery", "UPS", "Mains", "USB", |
85efc8a1 | 48 | "USB_DCP", "USB_CDP", "USB_ACA" |
5f487cd3 | 49 | }; |
4a11b59d AV |
50 | static char *status_text[] = { |
51 | "Unknown", "Charging", "Discharging", "Not charging", "Full" | |
52 | }; | |
ee8076ed AS |
53 | static char *charge_type[] = { |
54 | "Unknown", "N/A", "Trickle", "Fast" | |
55 | }; | |
4a11b59d AV |
56 | static char *health_text[] = { |
57 | "Unknown", "Good", "Overheat", "Dead", "Over voltage", | |
7e386e6e | 58 | "Unspecified failure", "Cold", |
4a11b59d AV |
59 | }; |
60 | static char *technology_text[] = { | |
c7cc930f DB |
61 | "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd", |
62 | "LiMn" | |
4a11b59d | 63 | }; |
b294a290 AS |
64 | static char *capacity_level_text[] = { |
65 | "Unknown", "Critical", "Low", "Normal", "High", "Full" | |
66 | }; | |
25a0bc2d JF |
67 | static char *scope_text[] = { |
68 | "Unknown", "System", "Device" | |
69 | }; | |
5f487cd3 | 70 | ssize_t ret = 0; |
4a11b59d AV |
71 | struct power_supply *psy = dev_get_drvdata(dev); |
72 | const ptrdiff_t off = attr - power_supply_attrs; | |
73 | union power_supply_propval value; | |
74 | ||
5f487cd3 AV |
75 | if (off == POWER_SUPPLY_PROP_TYPE) |
76 | value.intval = psy->type; | |
77 | else | |
78 | ret = psy->get_property(psy, off, &value); | |
4a11b59d AV |
79 | |
80 | if (ret < 0) { | |
9d233e8b AV |
81 | if (ret == -ENODATA) |
82 | dev_dbg(dev, "driver has no data for `%s' property\n", | |
83 | attr->attr.name); | |
84 | else if (ret != -ENODEV) | |
85b5fbf7 | 85 | dev_err(dev, "driver failed to report `%s' property: %zd\n", |
35c3ae5e | 86 | attr->attr.name, ret); |
4a11b59d AV |
87 | return ret; |
88 | } | |
89 | ||
90 | if (off == POWER_SUPPLY_PROP_STATUS) | |
91 | return sprintf(buf, "%s\n", status_text[value.intval]); | |
ee8076ed AS |
92 | else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE) |
93 | return sprintf(buf, "%s\n", charge_type[value.intval]); | |
4a11b59d AV |
94 | else if (off == POWER_SUPPLY_PROP_HEALTH) |
95 | return sprintf(buf, "%s\n", health_text[value.intval]); | |
96 | else if (off == POWER_SUPPLY_PROP_TECHNOLOGY) | |
97 | return sprintf(buf, "%s\n", technology_text[value.intval]); | |
b294a290 AS |
98 | else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL) |
99 | return sprintf(buf, "%s\n", capacity_level_text[value.intval]); | |
5f487cd3 AV |
100 | else if (off == POWER_SUPPLY_PROP_TYPE) |
101 | return sprintf(buf, "%s\n", type_text[value.intval]); | |
25a0bc2d JF |
102 | else if (off == POWER_SUPPLY_PROP_SCOPE) |
103 | return sprintf(buf, "%s\n", scope_text[value.intval]); | |
4a11b59d AV |
104 | else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) |
105 | return sprintf(buf, "%s\n", value.strval); | |
106 | ||
107 | return sprintf(buf, "%d\n", value.intval); | |
108 | } | |
109 | ||
0011d2d4 DM |
110 | static ssize_t power_supply_store_property(struct device *dev, |
111 | struct device_attribute *attr, | |
112 | const char *buf, size_t count) { | |
113 | ssize_t ret; | |
114 | struct power_supply *psy = dev_get_drvdata(dev); | |
115 | const ptrdiff_t off = attr - power_supply_attrs; | |
116 | union power_supply_propval value; | |
117 | long long_val; | |
118 | ||
119 | /* TODO: support other types than int */ | |
120 | ret = strict_strtol(buf, 10, &long_val); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | ||
124 | value.intval = long_val; | |
125 | ||
126 | ret = psy->set_property(psy, off, &value); | |
127 | if (ret < 0) | |
128 | return ret; | |
129 | ||
130 | return count; | |
131 | } | |
132 | ||
4a11b59d AV |
133 | /* Must be in the same order as POWER_SUPPLY_PROP_* */ |
134 | static struct device_attribute power_supply_attrs[] = { | |
135 | /* Properties of type `int' */ | |
136 | POWER_SUPPLY_ATTR(status), | |
ee8076ed | 137 | POWER_SUPPLY_ATTR(charge_type), |
4a11b59d AV |
138 | POWER_SUPPLY_ATTR(health), |
139 | POWER_SUPPLY_ATTR(present), | |
140 | POWER_SUPPLY_ATTR(online), | |
141 | POWER_SUPPLY_ATTR(technology), | |
c955fe8e | 142 | POWER_SUPPLY_ATTR(cycle_count), |
c7cc930f DB |
143 | POWER_SUPPLY_ATTR(voltage_max), |
144 | POWER_SUPPLY_ATTR(voltage_min), | |
4a11b59d AV |
145 | POWER_SUPPLY_ATTR(voltage_max_design), |
146 | POWER_SUPPLY_ATTR(voltage_min_design), | |
147 | POWER_SUPPLY_ATTR(voltage_now), | |
148 | POWER_SUPPLY_ATTR(voltage_avg), | |
fe3f6d09 | 149 | POWER_SUPPLY_ATTR(current_max), |
4a11b59d AV |
150 | POWER_SUPPLY_ATTR(current_now), |
151 | POWER_SUPPLY_ATTR(current_avg), | |
7faa144a AS |
152 | POWER_SUPPLY_ATTR(power_now), |
153 | POWER_SUPPLY_ATTR(power_avg), | |
4a11b59d AV |
154 | POWER_SUPPLY_ATTR(charge_full_design), |
155 | POWER_SUPPLY_ATTR(charge_empty_design), | |
156 | POWER_SUPPLY_ATTR(charge_full), | |
157 | POWER_SUPPLY_ATTR(charge_empty), | |
158 | POWER_SUPPLY_ATTR(charge_now), | |
159 | POWER_SUPPLY_ATTR(charge_avg), | |
8e552c36 | 160 | POWER_SUPPLY_ATTR(charge_counter), |
4a11b59d AV |
161 | POWER_SUPPLY_ATTR(energy_full_design), |
162 | POWER_SUPPLY_ATTR(energy_empty_design), | |
163 | POWER_SUPPLY_ATTR(energy_full), | |
164 | POWER_SUPPLY_ATTR(energy_empty), | |
165 | POWER_SUPPLY_ATTR(energy_now), | |
166 | POWER_SUPPLY_ATTR(energy_avg), | |
167 | POWER_SUPPLY_ATTR(capacity), | |
b294a290 | 168 | POWER_SUPPLY_ATTR(capacity_level), |
4a11b59d AV |
169 | POWER_SUPPLY_ATTR(temp), |
170 | POWER_SUPPLY_ATTR(temp_ambient), | |
171 | POWER_SUPPLY_ATTR(time_to_empty_now), | |
172 | POWER_SUPPLY_ATTR(time_to_empty_avg), | |
173 | POWER_SUPPLY_ATTR(time_to_full_now), | |
174 | POWER_SUPPLY_ATTR(time_to_full_avg), | |
5f487cd3 | 175 | POWER_SUPPLY_ATTR(type), |
25a0bc2d | 176 | POWER_SUPPLY_ATTR(scope), |
4a11b59d AV |
177 | /* Properties of type `const char *' */ |
178 | POWER_SUPPLY_ATTR(model_name), | |
179 | POWER_SUPPLY_ATTR(manufacturer), | |
7c2670bb | 180 | POWER_SUPPLY_ATTR(serial_number), |
4a11b59d AV |
181 | }; |
182 | ||
5f487cd3 AV |
183 | static struct attribute * |
184 | __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; | |
4a11b59d | 185 | |
587a1f16 | 186 | static umode_t power_supply_attr_is_visible(struct kobject *kobj, |
5f487cd3 AV |
187 | struct attribute *attr, |
188 | int attrno) | |
4a11b59d | 189 | { |
5f487cd3 AV |
190 | struct device *dev = container_of(kobj, struct device, kobj); |
191 | struct power_supply *psy = dev_get_drvdata(dev); | |
587a1f16 | 192 | umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; |
5f487cd3 | 193 | int i; |
4a11b59d | 194 | |
bbabb158 DM |
195 | if (attrno == POWER_SUPPLY_PROP_TYPE) |
196 | return mode; | |
197 | ||
5f487cd3 | 198 | for (i = 0; i < psy->num_properties; i++) { |
0011d2d4 DM |
199 | int property = psy->properties[i]; |
200 | ||
201 | if (property == attrno) { | |
0011d2d4 DM |
202 | if (psy->property_is_writeable && |
203 | psy->property_is_writeable(psy, property) > 0) | |
204 | mode |= S_IWUSR; | |
205 | ||
206 | return mode; | |
207 | } | |
4a11b59d AV |
208 | } |
209 | ||
5f487cd3 | 210 | return 0; |
4a11b59d AV |
211 | } |
212 | ||
5f487cd3 AV |
213 | static struct attribute_group power_supply_attr_group = { |
214 | .attrs = __power_supply_attrs, | |
215 | .is_visible = power_supply_attr_is_visible, | |
216 | }; | |
217 | ||
218 | static const struct attribute_group *power_supply_attr_groups[] = { | |
219 | &power_supply_attr_group, | |
220 | NULL, | |
221 | }; | |
222 | ||
223 | void power_supply_init_attrs(struct device_type *dev_type) | |
4a11b59d AV |
224 | { |
225 | int i; | |
226 | ||
5f487cd3 | 227 | dev_type->groups = power_supply_attr_groups; |
4a11b59d | 228 | |
5f487cd3 AV |
229 | for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) |
230 | __power_supply_attrs[i] = &power_supply_attrs[i].attr; | |
4a11b59d AV |
231 | } |
232 | ||
233 | static char *kstruprdup(const char *str, gfp_t gfp) | |
234 | { | |
235 | char *ret, *ustr; | |
236 | ||
237 | ustr = ret = kmalloc(strlen(str) + 1, gfp); | |
238 | ||
239 | if (!ret) | |
240 | return NULL; | |
241 | ||
242 | while (*str) | |
243 | *ustr++ = toupper(*str++); | |
244 | ||
245 | *ustr = 0; | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
7eff2e7a | 250 | int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) |
4a11b59d AV |
251 | { |
252 | struct power_supply *psy = dev_get_drvdata(dev); | |
7eff2e7a | 253 | int ret = 0, j; |
4a11b59d AV |
254 | char *prop_buf; |
255 | char *attrname; | |
256 | ||
257 | dev_dbg(dev, "uevent\n"); | |
258 | ||
56fa18e8 | 259 | if (!psy || !psy->dev) { |
4a11b59d AV |
260 | dev_dbg(dev, "No power supply yet\n"); |
261 | return ret; | |
262 | } | |
263 | ||
264 | dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name); | |
265 | ||
7eff2e7a | 266 | ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name); |
4a11b59d AV |
267 | if (ret) |
268 | return ret; | |
269 | ||
270 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); | |
271 | if (!prop_buf) | |
272 | return -ENOMEM; | |
273 | ||
4a11b59d AV |
274 | for (j = 0; j < psy->num_properties; j++) { |
275 | struct device_attribute *attr; | |
276 | char *line; | |
277 | ||
278 | attr = &power_supply_attrs[psy->properties[j]]; | |
279 | ||
280 | ret = power_supply_show_property(dev, attr, prop_buf); | |
f722e17f | 281 | if (ret == -ENODEV || ret == -ENODATA) { |
4a11b59d AV |
282 | /* When a battery is absent, we expect -ENODEV. Don't abort; |
283 | send the uevent with at least the the PRESENT=0 property */ | |
284 | ret = 0; | |
285 | continue; | |
286 | } | |
287 | ||
288 | if (ret < 0) | |
289 | goto out; | |
290 | ||
291 | line = strchr(prop_buf, '\n'); | |
292 | if (line) | |
293 | *line = 0; | |
294 | ||
295 | attrname = kstruprdup(attr->attr.name, GFP_KERNEL); | |
296 | if (!attrname) { | |
297 | ret = -ENOMEM; | |
298 | goto out; | |
299 | } | |
300 | ||
301 | dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); | |
302 | ||
7eff2e7a | 303 | ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); |
4a11b59d AV |
304 | kfree(attrname); |
305 | if (ret) | |
306 | goto out; | |
307 | } | |
308 | ||
309 | out: | |
310 | free_page((unsigned long)prop_buf); | |
311 | ||
312 | return ret; | |
313 | } |