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/device.h>
16 #include <linux/power_supply.h>
17 #include <linux/slab.h>
18 #include <linux/stat.h>
19
20 #include "power_supply.h"
21
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 { \
36 .attr = { .name = #_name }, \
37 .show = power_supply_show_property, \
38 .store = power_supply_store_property, \
39 }
40
41 static struct device_attribute power_supply_attrs[];
42
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)43 static ssize_t power_supply_show_property(struct device *dev,
44 struct device_attribute *attr,
45 char *buf) {
46 static char *type_text[] = {
47 "Unknown", "Battery", "UPS", "Mains", "USB",
48 "USB_DCP", "USB_CDP", "USB_ACA"
49 };
50 static char *status_text[] = {
51 "Unknown", "Charging", "Discharging", "Not charging", "Full"
52 };
53 static char *charge_type[] = {
54 "Unknown", "N/A", "Trickle", "Fast"
55 };
56 static char *health_text[] = {
57 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
58 "Unspecified failure", "Cold", "Watchdog timer expire",
59 "Safety timer expire"
60 };
61 static char *technology_text[] = {
62 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
63 "LiMn"
64 };
65 static char *capacity_level_text[] = {
66 "Unknown", "Critical", "Low", "Normal", "High", "Full"
67 };
68 static char *scope_text[] = {
69 "Unknown", "System", "Device"
70 };
71 ssize_t ret = 0;
72 struct power_supply *psy = dev_get_drvdata(dev);
73 const ptrdiff_t off = attr - power_supply_attrs;
74 union power_supply_propval value;
75
76 if (off == POWER_SUPPLY_PROP_TYPE) {
77 value.intval = psy->desc->type;
78 } else {
79 ret = power_supply_get_property(psy, off, &value);
80
81 if (ret < 0) {
82 if (ret == -ENODATA)
83 dev_dbg(dev, "driver has no data for `%s' property\n",
84 attr->attr.name);
85 else if (ret != -ENODEV)
86 dev_err(dev, "driver failed to report `%s' property: %zd\n",
87 attr->attr.name, ret);
88 return ret;
89 }
90 }
91
92 if (off == POWER_SUPPLY_PROP_STATUS)
93 return sprintf(buf, "%s\n", status_text[value.intval]);
94 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
95 return sprintf(buf, "%s\n", charge_type[value.intval]);
96 else if (off == POWER_SUPPLY_PROP_HEALTH)
97 return sprintf(buf, "%s\n", health_text[value.intval]);
98 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
99 return sprintf(buf, "%s\n", technology_text[value.intval]);
100 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
101 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
102 else if (off == POWER_SUPPLY_PROP_TYPE)
103 return sprintf(buf, "%s\n", type_text[value.intval]);
104 else if (off == POWER_SUPPLY_PROP_SCOPE)
105 return sprintf(buf, "%s\n", scope_text[value.intval]);
106 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
107 return sprintf(buf, "%s\n", value.strval);
108
109 return sprintf(buf, "%d\n", value.intval);
110 }
111
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)112 static ssize_t power_supply_store_property(struct device *dev,
113 struct device_attribute *attr,
114 const char *buf, size_t count) {
115 ssize_t ret;
116 struct power_supply *psy = dev_get_drvdata(dev);
117 const ptrdiff_t off = attr - power_supply_attrs;
118 union power_supply_propval value;
119 long long_val;
120
121 /* TODO: support other types than int */
122 ret = kstrtol(buf, 10, &long_val);
123 if (ret < 0)
124 return ret;
125
126 value.intval = long_val;
127
128 ret = power_supply_set_property(psy, off, &value);
129 if (ret < 0)
130 return ret;
131
132 return count;
133 }
134
135 /* Must be in the same order as POWER_SUPPLY_PROP_* */
136 static struct device_attribute power_supply_attrs[] = {
137 /* Properties of type `int' */
138 POWER_SUPPLY_ATTR(status),
139 POWER_SUPPLY_ATTR(charge_type),
140 POWER_SUPPLY_ATTR(health),
141 POWER_SUPPLY_ATTR(present),
142 POWER_SUPPLY_ATTR(online),
143 POWER_SUPPLY_ATTR(authentic),
144 POWER_SUPPLY_ATTR(technology),
145 POWER_SUPPLY_ATTR(cycle_count),
146 POWER_SUPPLY_ATTR(voltage_max),
147 POWER_SUPPLY_ATTR(voltage_min),
148 POWER_SUPPLY_ATTR(voltage_max_design),
149 POWER_SUPPLY_ATTR(voltage_min_design),
150 POWER_SUPPLY_ATTR(voltage_now),
151 POWER_SUPPLY_ATTR(voltage_avg),
152 POWER_SUPPLY_ATTR(voltage_ocv),
153 POWER_SUPPLY_ATTR(voltage_boot),
154 POWER_SUPPLY_ATTR(current_max),
155 POWER_SUPPLY_ATTR(current_now),
156 POWER_SUPPLY_ATTR(current_avg),
157 POWER_SUPPLY_ATTR(current_boot),
158 POWER_SUPPLY_ATTR(power_now),
159 POWER_SUPPLY_ATTR(power_avg),
160 POWER_SUPPLY_ATTR(charge_full_design),
161 POWER_SUPPLY_ATTR(charge_empty_design),
162 POWER_SUPPLY_ATTR(charge_full),
163 POWER_SUPPLY_ATTR(charge_empty),
164 POWER_SUPPLY_ATTR(charge_now),
165 POWER_SUPPLY_ATTR(charge_avg),
166 POWER_SUPPLY_ATTR(charge_counter),
167 POWER_SUPPLY_ATTR(constant_charge_current),
168 POWER_SUPPLY_ATTR(constant_charge_current_max),
169 POWER_SUPPLY_ATTR(constant_charge_voltage),
170 POWER_SUPPLY_ATTR(constant_charge_voltage_max),
171 POWER_SUPPLY_ATTR(charge_control_limit),
172 POWER_SUPPLY_ATTR(charge_control_limit_max),
173 POWER_SUPPLY_ATTR(input_current_limit),
174 POWER_SUPPLY_ATTR(energy_full_design),
175 POWER_SUPPLY_ATTR(energy_empty_design),
176 POWER_SUPPLY_ATTR(energy_full),
177 POWER_SUPPLY_ATTR(energy_empty),
178 POWER_SUPPLY_ATTR(energy_now),
179 POWER_SUPPLY_ATTR(energy_avg),
180 POWER_SUPPLY_ATTR(capacity),
181 POWER_SUPPLY_ATTR(capacity_alert_min),
182 POWER_SUPPLY_ATTR(capacity_alert_max),
183 POWER_SUPPLY_ATTR(capacity_level),
184 POWER_SUPPLY_ATTR(temp),
185 POWER_SUPPLY_ATTR(temp_max),
186 POWER_SUPPLY_ATTR(temp_min),
187 POWER_SUPPLY_ATTR(temp_alert_min),
188 POWER_SUPPLY_ATTR(temp_alert_max),
189 POWER_SUPPLY_ATTR(temp_ambient),
190 POWER_SUPPLY_ATTR(temp_ambient_alert_min),
191 POWER_SUPPLY_ATTR(temp_ambient_alert_max),
192 POWER_SUPPLY_ATTR(time_to_empty_now),
193 POWER_SUPPLY_ATTR(time_to_empty_avg),
194 POWER_SUPPLY_ATTR(time_to_full_now),
195 POWER_SUPPLY_ATTR(time_to_full_avg),
196 POWER_SUPPLY_ATTR(type),
197 POWER_SUPPLY_ATTR(scope),
198 POWER_SUPPLY_ATTR(charge_term_current),
199 POWER_SUPPLY_ATTR(calibrate),
200 /* Properties of type `const char *' */
201 POWER_SUPPLY_ATTR(model_name),
202 POWER_SUPPLY_ATTR(manufacturer),
203 POWER_SUPPLY_ATTR(serial_number),
204 };
205
206 static struct attribute *
207 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
208
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)209 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
210 struct attribute *attr,
211 int attrno)
212 {
213 struct device *dev = container_of(kobj, struct device, kobj);
214 struct power_supply *psy = dev_get_drvdata(dev);
215 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
216 int i;
217
218 if (attrno == POWER_SUPPLY_PROP_TYPE)
219 return mode;
220
221 for (i = 0; i < psy->desc->num_properties; i++) {
222 int property = psy->desc->properties[i];
223
224 if (property == attrno) {
225 if (psy->desc->property_is_writeable &&
226 psy->desc->property_is_writeable(psy, property) > 0)
227 mode |= S_IWUSR;
228
229 return mode;
230 }
231 }
232
233 return 0;
234 }
235
236 static struct attribute_group power_supply_attr_group = {
237 .attrs = __power_supply_attrs,
238 .is_visible = power_supply_attr_is_visible,
239 };
240
241 static const struct attribute_group *power_supply_attr_groups[] = {
242 &power_supply_attr_group,
243 NULL,
244 };
245
power_supply_init_attrs(struct device_type * dev_type)246 void power_supply_init_attrs(struct device_type *dev_type)
247 {
248 int i;
249
250 dev_type->groups = power_supply_attr_groups;
251
252 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
253 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
254 }
255
kstruprdup(const char * str,gfp_t gfp)256 static char *kstruprdup(const char *str, gfp_t gfp)
257 {
258 char *ret, *ustr;
259
260 ustr = ret = kmalloc(strlen(str) + 1, gfp);
261
262 if (!ret)
263 return NULL;
264
265 while (*str)
266 *ustr++ = toupper(*str++);
267
268 *ustr = 0;
269
270 return ret;
271 }
272
power_supply_uevent(struct device * dev,struct kobj_uevent_env * env)273 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
274 {
275 struct power_supply *psy = dev_get_drvdata(dev);
276 int ret = 0, j;
277 char *prop_buf;
278 char *attrname;
279
280 dev_dbg(dev, "uevent\n");
281
282 if (!psy || !psy->desc) {
283 dev_dbg(dev, "No power supply yet\n");
284 return ret;
285 }
286
287 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name);
288
289 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
290 if (ret)
291 return ret;
292
293 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
294 if (!prop_buf)
295 return -ENOMEM;
296
297 for (j = 0; j < psy->desc->num_properties; j++) {
298 struct device_attribute *attr;
299 char *line;
300
301 attr = &power_supply_attrs[psy->desc->properties[j]];
302
303 ret = power_supply_show_property(dev, attr, prop_buf);
304 if (ret == -ENODEV || ret == -ENODATA) {
305 /* When a battery is absent, we expect -ENODEV. Don't abort;
306 send the uevent with at least the the PRESENT=0 property */
307 ret = 0;
308 continue;
309 }
310
311 if (ret < 0)
312 goto out;
313
314 line = strchr(prop_buf, '\n');
315 if (line)
316 *line = 0;
317
318 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
319 if (!attrname) {
320 ret = -ENOMEM;
321 goto out;
322 }
323
324 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
325
326 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
327 kfree(attrname);
328 if (ret)
329 goto out;
330 }
331
332 out:
333 free_page((unsigned long)prop_buf);
334
335 return ret;
336 }
337