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 if (off == POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT)
110 return sprintf(buf, "%lld\n", value.int64val);
111 else
112 return sprintf(buf, "%d\n", value.intval);
113 }
114
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)115 static ssize_t power_supply_store_property(struct device *dev,
116 struct device_attribute *attr,
117 const char *buf, size_t count) {
118 ssize_t ret;
119 struct power_supply *psy = dev_get_drvdata(dev);
120 const ptrdiff_t off = attr - power_supply_attrs;
121 union power_supply_propval value;
122 long long_val;
123
124 /* TODO: support other types than int */
125 ret = kstrtol(buf, 10, &long_val);
126 if (ret < 0)
127 return ret;
128
129 value.intval = long_val;
130
131 ret = power_supply_set_property(psy, off, &value);
132 if (ret < 0)
133 return ret;
134
135 return count;
136 }
137
138 /* Must be in the same order as POWER_SUPPLY_PROP_* */
139 static struct device_attribute power_supply_attrs[] = {
140 /* Properties of type `int' */
141 POWER_SUPPLY_ATTR(status),
142 POWER_SUPPLY_ATTR(charge_type),
143 POWER_SUPPLY_ATTR(health),
144 POWER_SUPPLY_ATTR(present),
145 POWER_SUPPLY_ATTR(online),
146 POWER_SUPPLY_ATTR(authentic),
147 POWER_SUPPLY_ATTR(technology),
148 POWER_SUPPLY_ATTR(cycle_count),
149 POWER_SUPPLY_ATTR(voltage_max),
150 POWER_SUPPLY_ATTR(voltage_min),
151 POWER_SUPPLY_ATTR(voltage_max_design),
152 POWER_SUPPLY_ATTR(voltage_min_design),
153 POWER_SUPPLY_ATTR(voltage_now),
154 POWER_SUPPLY_ATTR(voltage_avg),
155 POWER_SUPPLY_ATTR(voltage_ocv),
156 POWER_SUPPLY_ATTR(voltage_boot),
157 POWER_SUPPLY_ATTR(current_max),
158 POWER_SUPPLY_ATTR(current_now),
159 POWER_SUPPLY_ATTR(current_avg),
160 POWER_SUPPLY_ATTR(current_boot),
161 POWER_SUPPLY_ATTR(power_now),
162 POWER_SUPPLY_ATTR(power_avg),
163 POWER_SUPPLY_ATTR(charge_full_design),
164 POWER_SUPPLY_ATTR(charge_empty_design),
165 POWER_SUPPLY_ATTR(charge_full),
166 POWER_SUPPLY_ATTR(charge_empty),
167 POWER_SUPPLY_ATTR(charge_now),
168 POWER_SUPPLY_ATTR(charge_avg),
169 POWER_SUPPLY_ATTR(charge_counter),
170 POWER_SUPPLY_ATTR(constant_charge_current),
171 POWER_SUPPLY_ATTR(constant_charge_current_max),
172 POWER_SUPPLY_ATTR(constant_charge_voltage),
173 POWER_SUPPLY_ATTR(constant_charge_voltage_max),
174 POWER_SUPPLY_ATTR(charge_control_limit),
175 POWER_SUPPLY_ATTR(charge_control_limit_max),
176 POWER_SUPPLY_ATTR(input_current_limit),
177 POWER_SUPPLY_ATTR(energy_full_design),
178 POWER_SUPPLY_ATTR(energy_empty_design),
179 POWER_SUPPLY_ATTR(energy_full),
180 POWER_SUPPLY_ATTR(energy_empty),
181 POWER_SUPPLY_ATTR(energy_now),
182 POWER_SUPPLY_ATTR(energy_avg),
183 POWER_SUPPLY_ATTR(capacity),
184 POWER_SUPPLY_ATTR(capacity_alert_min),
185 POWER_SUPPLY_ATTR(capacity_alert_max),
186 POWER_SUPPLY_ATTR(capacity_level),
187 POWER_SUPPLY_ATTR(temp),
188 POWER_SUPPLY_ATTR(temp_max),
189 POWER_SUPPLY_ATTR(temp_min),
190 POWER_SUPPLY_ATTR(temp_alert_min),
191 POWER_SUPPLY_ATTR(temp_alert_max),
192 POWER_SUPPLY_ATTR(temp_ambient),
193 POWER_SUPPLY_ATTR(temp_ambient_alert_min),
194 POWER_SUPPLY_ATTR(temp_ambient_alert_max),
195 POWER_SUPPLY_ATTR(time_to_empty_now),
196 POWER_SUPPLY_ATTR(time_to_empty_avg),
197 POWER_SUPPLY_ATTR(time_to_full_now),
198 POWER_SUPPLY_ATTR(time_to_full_avg),
199 POWER_SUPPLY_ATTR(type),
200 POWER_SUPPLY_ATTR(scope),
201 POWER_SUPPLY_ATTR(charge_term_current),
202 POWER_SUPPLY_ATTR(calibrate),
203 /* Local extensions */
204 POWER_SUPPLY_ATTR(usb_hc),
205 POWER_SUPPLY_ATTR(usb_otg),
206 POWER_SUPPLY_ATTR(charge_enabled),
207 /* Local extensions of type int64_t */
208 POWER_SUPPLY_ATTR(charge_counter_ext),
209 /* Properties of type `const char *' */
210 POWER_SUPPLY_ATTR(model_name),
211 POWER_SUPPLY_ATTR(manufacturer),
212 POWER_SUPPLY_ATTR(serial_number),
213 };
214
215 static struct attribute *
216 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
217
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)218 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
219 struct attribute *attr,
220 int attrno)
221 {
222 struct device *dev = container_of(kobj, struct device, kobj);
223 struct power_supply *psy = dev_get_drvdata(dev);
224 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
225 int i;
226
227 if (attrno == POWER_SUPPLY_PROP_TYPE)
228 return mode;
229
230 for (i = 0; i < psy->desc->num_properties; i++) {
231 int property = psy->desc->properties[i];
232
233 if (property == attrno) {
234 if (psy->desc->property_is_writeable &&
235 psy->desc->property_is_writeable(psy, property) > 0)
236 mode |= S_IWUSR;
237
238 return mode;
239 }
240 }
241
242 return 0;
243 }
244
245 static struct attribute_group power_supply_attr_group = {
246 .attrs = __power_supply_attrs,
247 .is_visible = power_supply_attr_is_visible,
248 };
249
250 static const struct attribute_group *power_supply_attr_groups[] = {
251 &power_supply_attr_group,
252 NULL,
253 };
254
power_supply_init_attrs(struct device_type * dev_type)255 void power_supply_init_attrs(struct device_type *dev_type)
256 {
257 int i;
258
259 dev_type->groups = power_supply_attr_groups;
260
261 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
262 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
263 }
264
kstruprdup(const char * str,gfp_t gfp)265 static char *kstruprdup(const char *str, gfp_t gfp)
266 {
267 char *ret, *ustr;
268
269 ustr = ret = kmalloc(strlen(str) + 1, gfp);
270
271 if (!ret)
272 return NULL;
273
274 while (*str)
275 *ustr++ = toupper(*str++);
276
277 *ustr = 0;
278
279 return ret;
280 }
281
power_supply_uevent(struct device * dev,struct kobj_uevent_env * env)282 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
283 {
284 struct power_supply *psy = dev_get_drvdata(dev);
285 int ret = 0, j;
286 char *prop_buf;
287 char *attrname;
288
289 if (!psy || !psy->desc) {
290 dev_dbg(dev, "No power supply yet\n");
291 return ret;
292 }
293
294 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
295 if (ret)
296 return ret;
297
298 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
299 if (!prop_buf)
300 return -ENOMEM;
301
302 for (j = 0; j < psy->desc->num_properties; j++) {
303 struct device_attribute *attr;
304 char *line;
305
306 attr = &power_supply_attrs[psy->desc->properties[j]];
307
308 ret = power_supply_show_property(dev, attr, prop_buf);
309 if (ret == -ENODEV || ret == -ENODATA) {
310 /* When a battery is absent, we expect -ENODEV. Don't abort;
311 send the uevent with at least the the PRESENT=0 property */
312 ret = 0;
313 continue;
314 }
315
316 if (ret < 0)
317 goto out;
318
319 line = strchr(prop_buf, '\n');
320 if (line)
321 *line = 0;
322
323 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
324 if (!attrname) {
325 ret = -ENOMEM;
326 goto out;
327 }
328
329 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
330 kfree(attrname);
331 if (ret)
332 goto out;
333 }
334
335 out:
336 free_page((unsigned long)prop_buf);
337
338 return ret;
339 }
340