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 #include <linux/string_helpers.h>
19
20 #include "power_supply.h"
21
22 #define MAX_PROP_NAME_LEN 30
23
24 struct power_supply_attr {
25 const char *prop_name;
26 char attr_name[MAX_PROP_NAME_LEN + 1];
27 struct device_attribute dev_attr;
28 const char * const *text_values;
29 int text_values_len;
30 };
31
32 #define _POWER_SUPPLY_ATTR(_name, _text, _len) \
33 [POWER_SUPPLY_PROP_ ## _name] = \
34 { \
35 .prop_name = #_name, \
36 .attr_name = #_name, \
37 .text_values = _text, \
38 .text_values_len = _len, \
39 }
40
41 #define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0)
42 #define _POWER_SUPPLY_ENUM_ATTR(_name, _text) \
43 _POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text))
44 #define POWER_SUPPLY_ENUM_ATTR(_name) \
45 _POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT)
46
47 static const char * const POWER_SUPPLY_TYPE_TEXT[] = {
48 [POWER_SUPPLY_TYPE_UNKNOWN] = "Unknown",
49 [POWER_SUPPLY_TYPE_BATTERY] = "Battery",
50 [POWER_SUPPLY_TYPE_UPS] = "UPS",
51 [POWER_SUPPLY_TYPE_MAINS] = "Mains",
52 [POWER_SUPPLY_TYPE_USB] = "USB",
53 [POWER_SUPPLY_TYPE_USB_DCP] = "USB_DCP",
54 [POWER_SUPPLY_TYPE_USB_CDP] = "USB_CDP",
55 [POWER_SUPPLY_TYPE_USB_ACA] = "USB_ACA",
56 [POWER_SUPPLY_TYPE_USB_TYPE_C] = "USB_C",
57 [POWER_SUPPLY_TYPE_USB_PD] = "USB_PD",
58 [POWER_SUPPLY_TYPE_USB_PD_DRP] = "USB_PD_DRP",
59 [POWER_SUPPLY_TYPE_APPLE_BRICK_ID] = "BrickID",
60 [POWER_SUPPLY_TYPE_WIRELESS] = "Wireless",
61 };
62
63 static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = {
64 [POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown",
65 [POWER_SUPPLY_USB_TYPE_SDP] = "SDP",
66 [POWER_SUPPLY_USB_TYPE_DCP] = "DCP",
67 [POWER_SUPPLY_USB_TYPE_CDP] = "CDP",
68 [POWER_SUPPLY_USB_TYPE_ACA] = "ACA",
69 [POWER_SUPPLY_USB_TYPE_C] = "C",
70 [POWER_SUPPLY_USB_TYPE_PD] = "PD",
71 [POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP",
72 [POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS",
73 [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID",
74 };
75
76 static const char * const POWER_SUPPLY_STATUS_TEXT[] = {
77 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
78 [POWER_SUPPLY_STATUS_CHARGING] = "Charging",
79 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
80 [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
81 [POWER_SUPPLY_STATUS_FULL] = "Full",
82 };
83
84 static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
85 [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown",
86 [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A",
87 [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle",
88 [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast",
89 [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard",
90 [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive",
91 [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom",
92 [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life",
93 [POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass",
94 };
95
96 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
97 [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown",
98 [POWER_SUPPLY_HEALTH_GOOD] = "Good",
99 [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat",
100 [POWER_SUPPLY_HEALTH_DEAD] = "Dead",
101 [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage",
102 [POWER_SUPPLY_HEALTH_UNDERVOLTAGE] = "Under voltage",
103 [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure",
104 [POWER_SUPPLY_HEALTH_COLD] = "Cold",
105 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
106 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire",
107 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current",
108 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required",
109 [POWER_SUPPLY_HEALTH_WARM] = "Warm",
110 [POWER_SUPPLY_HEALTH_COOL] = "Cool",
111 [POWER_SUPPLY_HEALTH_HOT] = "Hot",
112 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery",
113 [POWER_SUPPLY_HEALTH_BLOWN_FUSE] = "Blown fuse",
114 [POWER_SUPPLY_HEALTH_CELL_IMBALANCE] = "Cell imbalance",
115 };
116
117 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
118 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown",
119 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH",
120 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion",
121 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly",
122 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe",
123 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd",
124 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn",
125 };
126
127 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
128 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown",
129 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical",
130 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low",
131 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal",
132 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High",
133 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full",
134 };
135
136 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
137 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown",
138 [POWER_SUPPLY_SCOPE_SYSTEM] = "System",
139 [POWER_SUPPLY_SCOPE_DEVICE] = "Device",
140 };
141
142 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
143 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto",
144 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge",
145 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE_AWAKE] = "inhibit-charge-awake",
146 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
147 };
148
149 static struct power_supply_attr power_supply_attrs[] __ro_after_init = {
150 /* Properties of type `int' */
151 POWER_SUPPLY_ENUM_ATTR(STATUS),
152 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
153 POWER_SUPPLY_ENUM_ATTR(HEALTH),
154 POWER_SUPPLY_ATTR(PRESENT),
155 POWER_SUPPLY_ATTR(ONLINE),
156 POWER_SUPPLY_ATTR(AUTHENTIC),
157 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
158 POWER_SUPPLY_ATTR(CYCLE_COUNT),
159 POWER_SUPPLY_ATTR(VOLTAGE_MAX),
160 POWER_SUPPLY_ATTR(VOLTAGE_MIN),
161 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
162 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
163 POWER_SUPPLY_ATTR(VOLTAGE_NOW),
164 POWER_SUPPLY_ATTR(VOLTAGE_AVG),
165 POWER_SUPPLY_ATTR(VOLTAGE_OCV),
166 POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
167 POWER_SUPPLY_ATTR(CURRENT_MAX),
168 POWER_SUPPLY_ATTR(CURRENT_NOW),
169 POWER_SUPPLY_ATTR(CURRENT_AVG),
170 POWER_SUPPLY_ATTR(CURRENT_BOOT),
171 POWER_SUPPLY_ATTR(POWER_NOW),
172 POWER_SUPPLY_ATTR(POWER_AVG),
173 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
174 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
175 POWER_SUPPLY_ATTR(CHARGE_FULL),
176 POWER_SUPPLY_ATTR(CHARGE_EMPTY),
177 POWER_SUPPLY_ATTR(CHARGE_NOW),
178 POWER_SUPPLY_ATTR(CHARGE_AVG),
179 POWER_SUPPLY_ATTR(CHARGE_COUNTER),
180 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
181 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
182 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
183 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
184 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
185 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
186 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
187 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
188 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
189 /* Same enum value texts as "charge_type" without the 's' at the end */
190 _POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPES, POWER_SUPPLY_CHARGE_TYPE_TEXT),
191 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
192 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
193 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
194 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
195 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
196 POWER_SUPPLY_ATTR(ENERGY_FULL),
197 POWER_SUPPLY_ATTR(ENERGY_EMPTY),
198 POWER_SUPPLY_ATTR(ENERGY_NOW),
199 POWER_SUPPLY_ATTR(ENERGY_AVG),
200 POWER_SUPPLY_ATTR(CAPACITY),
201 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
202 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
203 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
204 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
205 POWER_SUPPLY_ATTR(TEMP),
206 POWER_SUPPLY_ATTR(TEMP_MAX),
207 POWER_SUPPLY_ATTR(TEMP_MIN),
208 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
209 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
210 POWER_SUPPLY_ATTR(TEMP_AMBIENT),
211 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
212 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
213 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
214 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
215 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
216 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
217 POWER_SUPPLY_ENUM_ATTR(TYPE),
218 POWER_SUPPLY_ENUM_ATTR(USB_TYPE),
219 POWER_SUPPLY_ENUM_ATTR(SCOPE),
220 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
221 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
222 POWER_SUPPLY_ATTR(CALIBRATE),
223 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
224 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
225 POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
226 /* Properties of type `const char *' */
227 POWER_SUPPLY_ATTR(MODEL_NAME),
228 POWER_SUPPLY_ATTR(MANUFACTURER),
229 POWER_SUPPLY_ATTR(SERIAL_NUMBER),
230 };
231 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
232
233 static struct attribute *
234 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init;
235
to_ps_attr(struct device_attribute * attr)236 static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
237 {
238 return container_of(attr, struct power_supply_attr, dev_attr);
239 }
240
dev_attr_psp(struct device_attribute * attr)241 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
242 {
243 return to_ps_attr(attr) - power_supply_attrs;
244 }
245
power_supply_escape_spaces(const char * str,char * buf,size_t bufsize)246 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize)
247 {
248 strscpy(buf, str, bufsize);
249 strreplace(buf, ' ', '_');
250 }
251
power_supply_match_string(const char * const * array,size_t n,const char * s)252 static int power_supply_match_string(const char * const *array, size_t n, const char *s)
253 {
254 int ret;
255
256 /* First try an exact match */
257 ret = __sysfs_match_string(array, n, s);
258 if (ret >= 0)
259 return ret;
260
261 /* Second round, try matching with spaces replaced by '_' */
262 for (size_t i = 0; i < n; i++) {
263 char buf[32];
264
265 power_supply_escape_spaces(array[i], buf, sizeof(buf));
266 if (sysfs_streq(buf, s))
267 return i;
268 }
269
270 return -EINVAL;
271 }
272
power_supply_show_enum_with_available(struct device * dev,const char * const labels[],int label_count,unsigned int available_values,int value,char * buf)273 static ssize_t power_supply_show_enum_with_available(
274 struct device *dev, const char * const labels[], int label_count,
275 unsigned int available_values, int value, char *buf)
276 {
277 bool match = false, available, active;
278 char escaped_label[32];
279 ssize_t count = 0;
280 int i;
281
282 for (i = 0; i < label_count; i++) {
283 available = available_values & BIT(i);
284 active = i == value;
285 power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label));
286
287 if (available && active) {
288 count += sysfs_emit_at(buf, count, "[%s] ", escaped_label);
289 match = true;
290 } else if (available) {
291 count += sysfs_emit_at(buf, count, "%s ", escaped_label);
292 }
293 }
294
295 if (!match) {
296 dev_warn(dev, "driver reporting unavailable enum value %d\n", value);
297 return -EINVAL;
298 }
299
300 if (count)
301 buf[count - 1] = '\n';
302
303 return count;
304 }
305
power_supply_show_charge_behaviour(struct device * dev,struct power_supply * psy,union power_supply_propval * value,char * buf)306 static ssize_t power_supply_show_charge_behaviour(struct device *dev,
307 struct power_supply *psy,
308 union power_supply_propval *value,
309 char *buf)
310 {
311 struct power_supply_ext_registration *reg;
312
313 scoped_guard(rwsem_read, &psy->extensions_sem) {
314 power_supply_for_each_extension(reg, psy) {
315 if (power_supply_ext_has_property(reg->ext,
316 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR))
317 return power_supply_charge_behaviour_show(dev,
318 reg->ext->charge_behaviours,
319 value->intval, buf);
320 }
321 }
322
323 return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
324 value->intval, buf);
325 }
326
power_supply_show_charge_types(struct device * dev,struct power_supply * psy,enum power_supply_charge_type current_type,char * buf)327 static ssize_t power_supply_show_charge_types(struct device *dev,
328 struct power_supply *psy,
329 enum power_supply_charge_type current_type,
330 char *buf)
331 {
332 struct power_supply_ext_registration *reg;
333
334 scoped_guard(rwsem_read, &psy->extensions_sem) {
335 power_supply_for_each_extension(reg, psy) {
336 if (power_supply_ext_has_property(reg->ext,
337 POWER_SUPPLY_PROP_CHARGE_TYPES))
338 return power_supply_charge_types_show(dev,
339 reg->ext->charge_types,
340 current_type, buf);
341 }
342 }
343
344 return power_supply_charge_types_show(dev, psy->desc->charge_types,
345 current_type, buf);
346 }
347
power_supply_format_property(struct device * dev,bool uevent,struct device_attribute * attr,char * buf)348 static ssize_t power_supply_format_property(struct device *dev,
349 bool uevent,
350 struct device_attribute *attr,
351 char *buf)
352 {
353 ssize_t ret;
354 struct power_supply *psy = dev_to_psy(dev);
355 const struct power_supply_attr *ps_attr = to_ps_attr(attr);
356 enum power_supply_property psp = dev_attr_psp(attr);
357 union power_supply_propval value;
358
359 if (psp == POWER_SUPPLY_PROP_TYPE) {
360 value.intval = psy->desc->type;
361 } else {
362 ret = power_supply_get_property(psy, psp, &value);
363
364 if (ret < 0) {
365 if (ret == -ENODATA)
366 dev_dbg_ratelimited(dev,
367 "driver has no data for `%s' property\n",
368 attr->attr.name);
369 else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL)
370 dev_err_ratelimited(dev,
371 "driver failed to report `%s' property: %zd\n",
372 attr->attr.name, ret);
373 return ret;
374 }
375 }
376
377 switch (psp) {
378 case POWER_SUPPLY_PROP_USB_TYPE:
379 ret = power_supply_show_enum_with_available(
380 dev, POWER_SUPPLY_USB_TYPE_TEXT,
381 ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT),
382 psy->desc->usb_types, value.intval, buf);
383 break;
384 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
385 if (uevent) /* no possible values in uevents */
386 goto default_format;
387 ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
388 break;
389 case POWER_SUPPLY_PROP_CHARGE_TYPES:
390 if (uevent) /* no possible values in uevents */
391 goto default_format;
392 ret = power_supply_show_charge_types(dev, psy,
393 value.intval, buf);
394 break;
395 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
396 ret = sysfs_emit(buf, "%s\n", value.strval);
397 break;
398 default:
399 default_format:
400 if (ps_attr->text_values_len > 0 &&
401 value.intval < ps_attr->text_values_len && value.intval >= 0) {
402 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
403 } else {
404 ret = sysfs_emit(buf, "%d\n", value.intval);
405 }
406 }
407
408 return ret;
409 }
410
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)411 static ssize_t power_supply_show_property(struct device *dev,
412 struct device_attribute *attr,
413 char *buf)
414 {
415 return power_supply_format_property(dev, false, attr, buf);
416 }
417
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)418 static ssize_t power_supply_store_property(struct device *dev,
419 struct device_attribute *attr,
420 const char *buf, size_t count) {
421 ssize_t ret;
422 struct power_supply *psy = dev_to_psy(dev);
423 const struct power_supply_attr *ps_attr = to_ps_attr(attr);
424 enum power_supply_property psp = dev_attr_psp(attr);
425 union power_supply_propval value;
426
427 ret = -EINVAL;
428 if (ps_attr->text_values_len > 0) {
429 ret = power_supply_match_string(ps_attr->text_values,
430 ps_attr->text_values_len, buf);
431 }
432
433 /*
434 * If no match was found, then check to see if it is an integer.
435 * Integer values are valid for enums in addition to the text value.
436 */
437 if (ret < 0) {
438 long long_val;
439
440 ret = kstrtol(buf, 10, &long_val);
441 if (ret < 0)
442 return ret;
443
444 ret = long_val;
445 }
446
447 value.intval = ret;
448
449 ret = power_supply_set_property(psy, psp, &value);
450 if (ret < 0)
451 return ret;
452
453 return count;
454 }
455
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)456 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
457 struct attribute *attr,
458 int attrno)
459 {
460 struct device *dev = kobj_to_dev(kobj);
461 struct power_supply *psy = dev_to_psy(dev);
462 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
463
464 if (!power_supply_attrs[attrno].prop_name)
465 return 0;
466
467 if (attrno == POWER_SUPPLY_PROP_TYPE)
468 return mode;
469
470 guard(rwsem_read)(&psy->extensions_sem);
471
472 if (power_supply_has_property(psy, attrno)) {
473 if (power_supply_property_is_writeable(psy, attrno) > 0)
474 mode |= S_IWUSR;
475 return mode;
476 }
477
478 return 0;
479 }
480
481 static const struct attribute_group power_supply_attr_group = {
482 .attrs = __power_supply_attrs,
483 .is_visible = power_supply_attr_is_visible,
484 };
485
486 static struct attribute *power_supply_extension_attrs[] = {
487 NULL
488 };
489
490 static const struct attribute_group power_supply_extension_group = {
491 .name = "extensions",
492 .attrs = power_supply_extension_attrs,
493 };
494
495 const struct attribute_group *power_supply_attr_groups[] = {
496 &power_supply_attr_group,
497 &power_supply_extension_group,
498 NULL
499 };
500
power_supply_init_attrs(void)501 void __init power_supply_init_attrs(void)
502 {
503 int i;
504
505 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
506 struct device_attribute *attr;
507
508 if (!power_supply_attrs[i].prop_name) {
509 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
510 __func__, i);
511 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
512 } else {
513 string_lower(power_supply_attrs[i].attr_name,
514 power_supply_attrs[i].attr_name);
515 }
516
517 attr = &power_supply_attrs[i].dev_attr;
518
519 attr->attr.name = power_supply_attrs[i].attr_name;
520 attr->show = power_supply_show_property;
521 attr->store = power_supply_store_property;
522 __power_supply_attrs[i] = &attr->attr;
523 }
524 }
525
add_prop_uevent(const struct device * dev,struct kobj_uevent_env * env,enum power_supply_property prop,char * prop_buf)526 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
527 enum power_supply_property prop, char *prop_buf)
528 {
529 int ret = 0;
530 struct power_supply_attr *pwr_attr;
531 struct device_attribute *dev_attr;
532 char *line;
533
534 pwr_attr = &power_supply_attrs[prop];
535 dev_attr = &pwr_attr->dev_attr;
536
537 ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf);
538 if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) {
539 /*
540 * When a battery is absent, we expect -ENODEV. Don't abort;
541 * send the uevent with at least the PRESENT=0 property
542 */
543 return 0;
544 }
545
546 if (ret < 0)
547 return ret;
548
549 line = strchr(prop_buf, '\n');
550 if (line)
551 *line = 0;
552
553 return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
554 pwr_attr->prop_name, prop_buf);
555 }
556
power_supply_uevent(const struct device * dev,struct kobj_uevent_env * env)557 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
558 {
559 const struct power_supply *psy = dev_to_psy(dev);
560 int ret = 0, j;
561 char *prop_buf;
562
563 if (!psy || !psy->desc) {
564 dev_dbg(dev, "No power supply yet\n");
565 return ret;
566 }
567
568 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
569 if (ret)
570 return ret;
571
572 /*
573 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
574 * resources have been freed. Exit early to avoid use-after-free.
575 */
576 if (psy->removing)
577 return 0;
578
579 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
580 if (!prop_buf)
581 return -ENOMEM;
582
583 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
584 if (ret)
585 goto out;
586
587 for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) {
588 ret = add_prop_uevent(dev, env, j, prop_buf);
589 if (ret)
590 goto out;
591 }
592
593 out:
594 free_page((unsigned long)prop_buf);
595
596 return ret;
597 }
598
power_supply_charge_behaviour_show(struct device * dev,unsigned int available_behaviours,enum power_supply_charge_behaviour current_behaviour,char * buf)599 ssize_t power_supply_charge_behaviour_show(struct device *dev,
600 unsigned int available_behaviours,
601 enum power_supply_charge_behaviour current_behaviour,
602 char *buf)
603 {
604 return power_supply_show_enum_with_available(
605 dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT,
606 ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT),
607 available_behaviours, current_behaviour, buf);
608 }
609 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
610
power_supply_charge_behaviour_parse(unsigned int available_behaviours,const char * buf)611 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
612 {
613 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
614
615 if (i < 0)
616 return i;
617
618 if (available_behaviours & BIT(i))
619 return i;
620
621 return -EINVAL;
622 }
623 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
624
power_supply_charge_types_show(struct device * dev,unsigned int available_types,enum power_supply_charge_type current_type,char * buf)625 ssize_t power_supply_charge_types_show(struct device *dev,
626 unsigned int available_types,
627 enum power_supply_charge_type current_type,
628 char *buf)
629 {
630 return power_supply_show_enum_with_available(
631 dev, POWER_SUPPLY_CHARGE_TYPE_TEXT,
632 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
633 available_types, current_type, buf);
634 }
635 EXPORT_SYMBOL_GPL(power_supply_charge_types_show);
636
power_supply_charge_types_parse(unsigned int available_types,const char * buf)637 int power_supply_charge_types_parse(unsigned int available_types, const char *buf)
638 {
639 int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT,
640 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
641 buf);
642
643 if (i < 0)
644 return i;
645
646 if (available_types & BIT(i))
647 return i;
648
649 return -EINVAL;
650 }
651 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse);
652
power_supply_sysfs_add_extension(struct power_supply * psy,const struct power_supply_ext * ext,struct device * dev)653 int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext,
654 struct device *dev)
655 {
656 return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name,
657 &dev->kobj, ext->name);
658 }
659
power_supply_sysfs_remove_extension(struct power_supply * psy,const struct power_supply_ext * ext)660 void power_supply_sysfs_remove_extension(struct power_supply *psy,
661 const struct power_supply_ext *ext)
662 {
663 sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name);
664 }
665