1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Sysfs interface for the universal power supply monitor class
4 *
5 * Copyright © 2007 David Woodhouse <dwmw2@infradead.org>
6 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
7 * Copyright © 2004 Szabolcs Gyurko
8 * Copyright © 2003 Ian Molton <spyro@f2s.com>
9 *
10 * Modified: 2004, Oct Szabolcs Gyurko
11 */
12
13 #include <linux/ctype.h>
14 #include <linux/device.h>
15 #include <linux/power_supply.h>
16 #include <linux/slab.h>
17 #include <linux/stat.h>
18
19 #include "power_supply.h"
20
21 #define MAX_PROP_NAME_LEN 30
22
23 struct power_supply_attr {
24 const char *prop_name;
25 char attr_name[MAX_PROP_NAME_LEN + 1];
26 struct device_attribute dev_attr;
27 const char * const *text_values;
28 int text_values_len;
29 };
30
31 #define _POWER_SUPPLY_ATTR(_name, _text, _len) \
32 [POWER_SUPPLY_PROP_ ## _name] = \
33 { \
34 .prop_name = #_name, \
35 .attr_name = #_name "\0", \
36 .text_values = _text, \
37 .text_values_len = _len, \
38 }
39
40 #define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0)
41 #define _POWER_SUPPLY_ENUM_ATTR(_name, _text) \
42 _POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text))
43 #define POWER_SUPPLY_ENUM_ATTR(_name) \
44 _POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT)
45
46 static const char * const POWER_SUPPLY_TYPE_TEXT[] = {
47 [POWER_SUPPLY_TYPE_UNKNOWN] = "Unknown",
48 [POWER_SUPPLY_TYPE_BATTERY] = "Battery",
49 [POWER_SUPPLY_TYPE_UPS] = "UPS",
50 [POWER_SUPPLY_TYPE_MAINS] = "Mains",
51 [POWER_SUPPLY_TYPE_USB] = "USB",
52 [POWER_SUPPLY_TYPE_USB_DCP] = "USB_DCP",
53 [POWER_SUPPLY_TYPE_USB_CDP] = "USB_CDP",
54 [POWER_SUPPLY_TYPE_USB_ACA] = "USB_ACA",
55 [POWER_SUPPLY_TYPE_USB_TYPE_C] = "USB_C",
56 [POWER_SUPPLY_TYPE_USB_PD] = "USB_PD",
57 [POWER_SUPPLY_TYPE_USB_PD_DRP] = "USB_PD_DRP",
58 [POWER_SUPPLY_TYPE_APPLE_BRICK_ID] = "BrickID",
59 [POWER_SUPPLY_TYPE_WIRELESS] = "Wireless",
60 #if defined(CONFIG_NO_GKI)
61 [POWER_SUPPLY_TYPE_CHARGE_PUMP] = "Charge_Pump",
62 #endif
63 };
64
65 static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = {
66 [POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown",
67 [POWER_SUPPLY_USB_TYPE_SDP] = "SDP",
68 [POWER_SUPPLY_USB_TYPE_DCP] = "DCP",
69 [POWER_SUPPLY_USB_TYPE_CDP] = "CDP",
70 [POWER_SUPPLY_USB_TYPE_ACA] = "ACA",
71 [POWER_SUPPLY_USB_TYPE_C] = "C",
72 [POWER_SUPPLY_USB_TYPE_PD] = "PD",
73 [POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP",
74 [POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS",
75 [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID",
76 };
77
78 static const char * const POWER_SUPPLY_STATUS_TEXT[] = {
79 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
80 [POWER_SUPPLY_STATUS_CHARGING] = "Charging",
81 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
82 [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
83 [POWER_SUPPLY_STATUS_FULL] = "Full",
84 };
85
86 static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
87 [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown",
88 [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A",
89 [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle",
90 [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast",
91 [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard",
92 [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive",
93 [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom",
94 [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life",
95 [POWER_SUPPLY_CHARGE_TYPE_TAPER] = "Taper",
96 };
97
98 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
99 [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown",
100 [POWER_SUPPLY_HEALTH_GOOD] = "Good",
101 [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat",
102 [POWER_SUPPLY_HEALTH_DEAD] = "Dead",
103 [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage",
104 [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure",
105 [POWER_SUPPLY_HEALTH_COLD] = "Cold",
106 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
107 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire",
108 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current",
109 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required",
110 [POWER_SUPPLY_HEALTH_WARM] = "Warm",
111 [POWER_SUPPLY_HEALTH_COOL] = "Cool",
112 [POWER_SUPPLY_HEALTH_HOT] = "Hot",
113 };
114
115 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
116 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown",
117 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH",
118 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion",
119 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly",
120 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe",
121 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd",
122 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn",
123 };
124
125 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
126 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown",
127 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical",
128 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low",
129 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal",
130 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High",
131 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full",
132 };
133
134 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
135 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown",
136 [POWER_SUPPLY_SCOPE_SYSTEM] = "System",
137 [POWER_SUPPLY_SCOPE_DEVICE] = "Device",
138 };
139
140 static struct power_supply_attr power_supply_attrs[] = {
141 /* Properties of type `int' */
142 POWER_SUPPLY_ENUM_ATTR(STATUS),
143 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
144 POWER_SUPPLY_ENUM_ATTR(HEALTH),
145 POWER_SUPPLY_ATTR(PRESENT),
146 POWER_SUPPLY_ATTR(ONLINE),
147 POWER_SUPPLY_ATTR(AUTHENTIC),
148 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
149 POWER_SUPPLY_ATTR(CYCLE_COUNT),
150 POWER_SUPPLY_ATTR(VOLTAGE_MAX),
151 POWER_SUPPLY_ATTR(VOLTAGE_MIN),
152 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
153 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
154 POWER_SUPPLY_ATTR(VOLTAGE_NOW),
155 POWER_SUPPLY_ATTR(VOLTAGE_AVG),
156 POWER_SUPPLY_ATTR(VOLTAGE_OCV),
157 POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
158 POWER_SUPPLY_ATTR(CURRENT_MAX),
159 POWER_SUPPLY_ATTR(CURRENT_NOW),
160 POWER_SUPPLY_ATTR(CURRENT_AVG),
161 POWER_SUPPLY_ATTR(CURRENT_BOOT),
162 POWER_SUPPLY_ATTR(POWER_NOW),
163 POWER_SUPPLY_ATTR(POWER_AVG),
164 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
165 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
166 POWER_SUPPLY_ATTR(CHARGE_FULL),
167 POWER_SUPPLY_ATTR(CHARGE_EMPTY),
168 POWER_SUPPLY_ATTR(CHARGE_NOW),
169 POWER_SUPPLY_ATTR(CHARGE_AVG),
170 POWER_SUPPLY_ATTR(CHARGE_COUNTER),
171 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
172 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
173 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
174 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
175 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
176 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
177 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
178 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
179 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
180 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
181 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
182 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
183 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
184 POWER_SUPPLY_ATTR(ENERGY_FULL),
185 POWER_SUPPLY_ATTR(ENERGY_EMPTY),
186 POWER_SUPPLY_ATTR(ENERGY_NOW),
187 POWER_SUPPLY_ATTR(ENERGY_AVG),
188 POWER_SUPPLY_ATTR(CAPACITY),
189 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
190 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
191 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
192 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
193 POWER_SUPPLY_ATTR(TEMP),
194 POWER_SUPPLY_ATTR(TEMP_MAX),
195 POWER_SUPPLY_ATTR(TEMP_MIN),
196 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
197 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
198 POWER_SUPPLY_ATTR(TEMP_AMBIENT),
199 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
200 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
201 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
202 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
203 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
204 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
205 POWER_SUPPLY_ENUM_ATTR(TYPE),
206 POWER_SUPPLY_ATTR(USB_TYPE),
207 POWER_SUPPLY_ENUM_ATTR(SCOPE),
208 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
209 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
210 POWER_SUPPLY_ATTR(CALIBRATE),
211 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
212 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
213 POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
214 #if defined(CONFIG_NO_GKI)
215 /* Charge pump properties */
216 POWER_SUPPLY_ATTR(CP_ALARM_STATUS),
217 POWER_SUPPLY_ATTR(CP_BAT_OVP_ALARM),
218 POWER_SUPPLY_ATTR(CP_BAT_OCP_ALARM),
219 POWER_SUPPLY_ATTR(CP_BAT_UCP_ALARM),
220 POWER_SUPPLY_ATTR(CP_BUS_OVP_ALARM),
221 POWER_SUPPLY_ATTR(CP_BUS_OCP_ALARM),
222 POWER_SUPPLY_ATTR(CP_BAT_THERM_ALARM),
223 POWER_SUPPLY_ATTR(CP_BUS_THERM_ALARM),
224 POWER_SUPPLY_ATTR(CP_DIE_THERM_ALARM),
225 POWER_SUPPLY_ATTR(CP_FAULT_STATUS),
226 POWER_SUPPLY_ATTR(CP_BAT_OVP_FAULT),
227 POWER_SUPPLY_ATTR(CP_BAT_OCP_FAULT),
228 POWER_SUPPLY_ATTR(CP_BUS_OVP_FAULT),
229 POWER_SUPPLY_ATTR(CP_BUS_OCP_FAULT),
230 POWER_SUPPLY_ATTR(CP_BAT_THERM_FAULT),
231 POWER_SUPPLY_ATTR(CP_BUS_THERM_FAULT),
232 POWER_SUPPLY_ATTR(CP_DIE_THERM_FAULT),
233 POWER_SUPPLY_ATTR(CP_VBUS_ERROR_STATUS),
234 POWER_SUPPLY_ATTR(CP_VBUS_HERROR_STATUS),
235 POWER_SUPPLY_ATTR(CP_VBUS_LERROR_STATUS),
236 POWER_SUPPLY_ATTR(CP_CHARGING_ENABLED),
237 POWER_SUPPLY_ATTR(CP_WDT_EN),
238 POWER_SUPPLY_ATTR(CP_VBUS),
239 POWER_SUPPLY_ATTR(CP_IBUS),
240 POWER_SUPPLY_ATTR(CP_SWITCHER_EN),
241 POWER_SUPPLY_ATTR(CP_BAT_TEMPERATURE),
242 POWER_SUPPLY_ATTR(CP_BUS_TEMPERATURE),
243 POWER_SUPPLY_ATTR(CP_DIE_TEMPERATURE),
244 POWER_SUPPLY_ATTR(CP_ISNS),
245 POWER_SUPPLY_ATTR(CP_TOGGLE_SWITCHER),
246 POWER_SUPPLY_ATTR(CP_IRQ_STATUS),
247 POWER_SUPPLY_ATTR(CP_ILIM),
248 #endif
249 /* Properties of type `const char *' */
250 POWER_SUPPLY_ATTR(MODEL_NAME),
251 POWER_SUPPLY_ATTR(MANUFACTURER),
252 POWER_SUPPLY_ATTR(SERIAL_NUMBER),
253 };
254
255 static struct attribute *
256 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
257
to_ps_attr(struct device_attribute * attr)258 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
259 {
260 return container_of(attr, struct power_supply_attr, dev_attr);
261 }
262
dev_attr_psp(struct device_attribute * attr)263 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
264 {
265 return to_ps_attr(attr) - power_supply_attrs;
266 }
267
power_supply_show_usb_type(struct device * dev,const struct power_supply_desc * desc,union power_supply_propval * value,char * buf)268 static ssize_t power_supply_show_usb_type(struct device *dev,
269 const struct power_supply_desc *desc,
270 union power_supply_propval *value,
271 char *buf)
272 {
273 enum power_supply_usb_type usb_type;
274 ssize_t count = 0;
275 bool match = false;
276 int i;
277
278 for (i = 0; i < desc->num_usb_types; ++i) {
279 usb_type = desc->usb_types[i];
280
281 if (value->intval == usb_type) {
282 count += sprintf(buf + count, "[%s] ",
283 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
284 match = true;
285 } else {
286 count += sprintf(buf + count, "%s ",
287 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
288 }
289 }
290
291 if (!match) {
292 dev_warn(dev, "driver reporting unsupported connected type\n");
293 return -EINVAL;
294 }
295
296 if (count)
297 buf[count - 1] = '\n';
298
299 return count;
300 }
301
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)302 static ssize_t power_supply_show_property(struct device *dev,
303 struct device_attribute *attr,
304 char *buf) {
305 ssize_t ret;
306 struct power_supply *psy = dev_get_drvdata(dev);
307 struct power_supply_attr *ps_attr = to_ps_attr(attr);
308 enum power_supply_property psp = dev_attr_psp(attr);
309 union power_supply_propval value;
310
311 if (psp == POWER_SUPPLY_PROP_TYPE) {
312 value.intval = psy->desc->type;
313 } else {
314 ret = power_supply_get_property(psy, psp, &value);
315
316 if (ret < 0) {
317 if (ret == -ENODATA)
318 dev_dbg(dev, "driver has no data for `%s' property\n",
319 attr->attr.name);
320 else if (ret != -ENODEV && ret != -EAGAIN)
321 dev_err_ratelimited(dev,
322 "driver failed to report `%s' property: %zd\n",
323 attr->attr.name, ret);
324 return ret;
325 }
326 }
327
328 if (ps_attr->text_values_len > 0 &&
329 value.intval < ps_attr->text_values_len && value.intval >= 0) {
330 return sprintf(buf, "%s\n", ps_attr->text_values[value.intval]);
331 }
332
333 switch (psp) {
334 case POWER_SUPPLY_PROP_USB_TYPE:
335 ret = power_supply_show_usb_type(dev, psy->desc,
336 &value, buf);
337 break;
338 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
339 ret = sprintf(buf, "%s\n", value.strval);
340 break;
341 default:
342 ret = sprintf(buf, "%d\n", value.intval);
343 }
344
345 return ret;
346 }
347
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)348 static ssize_t power_supply_store_property(struct device *dev,
349 struct device_attribute *attr,
350 const char *buf, size_t count) {
351 ssize_t ret;
352 struct power_supply *psy = dev_get_drvdata(dev);
353 struct power_supply_attr *ps_attr = to_ps_attr(attr);
354 enum power_supply_property psp = dev_attr_psp(attr);
355 union power_supply_propval value;
356
357 ret = -EINVAL;
358 if (ps_attr->text_values_len > 0) {
359 ret = __sysfs_match_string(ps_attr->text_values,
360 ps_attr->text_values_len, buf);
361 }
362
363 /*
364 * If no match was found, then check to see if it is an integer.
365 * Integer values are valid for enums in addition to the text value.
366 */
367 if (ret < 0) {
368 long long_val;
369
370 ret = kstrtol(buf, 10, &long_val);
371 if (ret < 0)
372 return ret;
373
374 ret = long_val;
375 }
376
377 value.intval = ret;
378
379 ret = power_supply_set_property(psy, psp, &value);
380 if (ret < 0)
381 return ret;
382
383 return count;
384 }
385
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)386 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
387 struct attribute *attr,
388 int attrno)
389 {
390 struct device *dev = kobj_to_dev(kobj);
391 struct power_supply *psy = dev_get_drvdata(dev);
392 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
393 int i;
394
395 if (!power_supply_attrs[attrno].prop_name)
396 return 0;
397
398 if (attrno == POWER_SUPPLY_PROP_TYPE)
399 return mode;
400
401 for (i = 0; i < psy->desc->num_properties; i++) {
402 int property = psy->desc->properties[i];
403
404 if (property == attrno) {
405 if (psy->desc->property_is_writeable &&
406 psy->desc->property_is_writeable(psy, property) > 0)
407 mode |= S_IWUSR;
408
409 return mode;
410 }
411 }
412
413 return 0;
414 }
415
416 static struct attribute_group power_supply_attr_group = {
417 .attrs = __power_supply_attrs,
418 .is_visible = power_supply_attr_is_visible,
419 };
420
421 static const struct attribute_group *power_supply_attr_groups[] = {
422 &power_supply_attr_group,
423 NULL,
424 };
425
str_to_lower(char * str)426 static void str_to_lower(char *str)
427 {
428 while (*str) {
429 *str = tolower(*str);
430 str++;
431 }
432 }
433
power_supply_init_attrs(struct device_type * dev_type)434 void power_supply_init_attrs(struct device_type *dev_type)
435 {
436 int i;
437
438 dev_type->groups = power_supply_attr_groups;
439
440 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
441 struct device_attribute *attr;
442
443 if (!power_supply_attrs[i].prop_name) {
444 pr_warn("%s: Property %d skipped because is is missing from power_supply_attrs\n",
445 __func__, i);
446 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
447 } else {
448 str_to_lower(power_supply_attrs[i].attr_name);
449 }
450
451 attr = &power_supply_attrs[i].dev_attr;
452
453 attr->attr.name = power_supply_attrs[i].attr_name;
454 attr->show = power_supply_show_property;
455 attr->store = power_supply_store_property;
456 __power_supply_attrs[i] = &attr->attr;
457 }
458 }
459
add_prop_uevent(struct device * dev,struct kobj_uevent_env * env,enum power_supply_property prop,char * prop_buf)460 static int add_prop_uevent(struct device *dev, struct kobj_uevent_env *env,
461 enum power_supply_property prop, char *prop_buf)
462 {
463 int ret = 0;
464 struct power_supply_attr *pwr_attr;
465 struct device_attribute *dev_attr;
466 char *line;
467
468 pwr_attr = &power_supply_attrs[prop];
469 dev_attr = &pwr_attr->dev_attr;
470
471 ret = power_supply_show_property(dev, dev_attr, prop_buf);
472 if (ret == -ENODEV || ret == -ENODATA) {
473 /*
474 * When a battery is absent, we expect -ENODEV. Don't abort;
475 * send the uevent with at least the the PRESENT=0 property
476 */
477 return 0;
478 }
479
480 if (ret < 0)
481 return ret;
482
483 line = strchr(prop_buf, '\n');
484 if (line)
485 *line = 0;
486
487 return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
488 pwr_attr->prop_name, prop_buf);
489 }
490
power_supply_uevent(struct device * dev,struct kobj_uevent_env * env)491 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
492 {
493 struct power_supply *psy = dev_get_drvdata(dev);
494 int ret = 0, j;
495 char *prop_buf;
496
497 if (!psy || !psy->desc) {
498 dev_dbg(dev, "No power supply yet\n");
499 return ret;
500 }
501
502 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
503 if (ret)
504 return ret;
505
506 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
507 if (!prop_buf)
508 return -ENOMEM;
509
510 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
511 if (ret)
512 goto out;
513
514 for (j = 0; j < psy->desc->num_properties; j++) {
515 ret = add_prop_uevent(dev, env, psy->desc->properties[j],
516 prop_buf);
517 if (ret)
518 goto out;
519 }
520
521 out:
522 free_page((unsigned long)prop_buf);
523
524 return ret;
525 }
526