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 <[email protected]>
6 * Copyright © 2007 Anton Vorontsov <[email protected]>
7 * Copyright © 2004 Szabolcs Gyurko
8 * Copyright © 2003 Ian Molton <[email protected]>
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 "\0", \
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 };
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 const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto",
142 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge",
143 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
144 };
145
146 static struct power_supply_attr power_supply_attrs[] __ro_after_init = {
147 /* Properties of type `int' */
148 POWER_SUPPLY_ENUM_ATTR(STATUS),
149 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
150 POWER_SUPPLY_ENUM_ATTR(HEALTH),
151 POWER_SUPPLY_ATTR(PRESENT),
152 POWER_SUPPLY_ATTR(ONLINE),
153 POWER_SUPPLY_ATTR(AUTHENTIC),
154 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
155 POWER_SUPPLY_ATTR(CYCLE_COUNT),
156 POWER_SUPPLY_ATTR(VOLTAGE_MAX),
157 POWER_SUPPLY_ATTR(VOLTAGE_MIN),
158 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
159 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
160 POWER_SUPPLY_ATTR(VOLTAGE_NOW),
161 POWER_SUPPLY_ATTR(VOLTAGE_AVG),
162 POWER_SUPPLY_ATTR(VOLTAGE_OCV),
163 POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
164 POWER_SUPPLY_ATTR(CURRENT_MAX),
165 POWER_SUPPLY_ATTR(CURRENT_NOW),
166 POWER_SUPPLY_ATTR(CURRENT_AVG),
167 POWER_SUPPLY_ATTR(CURRENT_BOOT),
168 POWER_SUPPLY_ATTR(POWER_NOW),
169 POWER_SUPPLY_ATTR(POWER_AVG),
170 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
171 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
172 POWER_SUPPLY_ATTR(CHARGE_FULL),
173 POWER_SUPPLY_ATTR(CHARGE_EMPTY),
174 POWER_SUPPLY_ATTR(CHARGE_NOW),
175 POWER_SUPPLY_ATTR(CHARGE_AVG),
176 POWER_SUPPLY_ATTR(CHARGE_COUNTER),
177 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
179 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
180 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
181 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
183 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
184 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
185 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
186 /* Same enum value texts as "charge_type" without the 's' at the end */
187 _POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPES, POWER_SUPPLY_CHARGE_TYPE_TEXT),
188 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
189 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
190 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
191 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
192 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
193 POWER_SUPPLY_ATTR(ENERGY_FULL),
194 POWER_SUPPLY_ATTR(ENERGY_EMPTY),
195 POWER_SUPPLY_ATTR(ENERGY_NOW),
196 POWER_SUPPLY_ATTR(ENERGY_AVG),
197 POWER_SUPPLY_ATTR(CAPACITY),
198 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
199 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
200 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
201 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
202 POWER_SUPPLY_ATTR(TEMP),
203 POWER_SUPPLY_ATTR(TEMP_MAX),
204 POWER_SUPPLY_ATTR(TEMP_MIN),
205 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
206 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
207 POWER_SUPPLY_ATTR(TEMP_AMBIENT),
208 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
209 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
210 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
211 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
212 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
213 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
214 POWER_SUPPLY_ENUM_ATTR(TYPE),
215 POWER_SUPPLY_ENUM_ATTR(USB_TYPE),
216 POWER_SUPPLY_ENUM_ATTR(SCOPE),
217 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
218 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
219 POWER_SUPPLY_ATTR(CALIBRATE),
220 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
221 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
222 POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
223 /* Properties of type `const char *' */
224 POWER_SUPPLY_ATTR(MODEL_NAME),
225 POWER_SUPPLY_ATTR(MANUFACTURER),
226 POWER_SUPPLY_ATTR(SERIAL_NUMBER),
227 };
228 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
229
230 static struct attribute *
231 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init;
232
to_ps_attr(struct device_attribute * attr)233 static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
234 {
235 return container_of(attr, struct power_supply_attr, dev_attr);
236 }
237
dev_attr_psp(struct device_attribute * attr)238 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
239 {
240 return to_ps_attr(attr) - power_supply_attrs;
241 }
242
power_supply_escape_spaces(const char * str,char * buf,size_t bufsize)243 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize)
244 {
245 strscpy(buf, str, bufsize);
246 strreplace(buf, ' ', '_');
247 }
248
power_supply_match_string(const char * const * array,size_t n,const char * s)249 static int power_supply_match_string(const char * const *array, size_t n, const char *s)
250 {
251 int ret;
252
253 /* First try an exact match */
254 ret = __sysfs_match_string(array, n, s);
255 if (ret >= 0)
256 return ret;
257
258 /* Second round, try matching with spaces replaced by '_' */
259 for (size_t i = 0; i < n; i++) {
260 char buf[32];
261
262 power_supply_escape_spaces(array[i], buf, sizeof(buf));
263 if (sysfs_streq(buf, s))
264 return i;
265 }
266
267 return -EINVAL;
268 }
269
power_supply_show_enum_with_available(struct device * dev,const char * const labels[],int label_count,unsigned int available_values,int value,char * buf)270 static ssize_t power_supply_show_enum_with_available(
271 struct device *dev, const char * const labels[], int label_count,
272 unsigned int available_values, int value, char *buf)
273 {
274 bool match = false, available, active;
275 char escaped_label[32];
276 ssize_t count = 0;
277 int i;
278
279 for (i = 0; i < label_count; i++) {
280 available = available_values & BIT(i);
281 active = i == value;
282 power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label));
283
284 if (available && active) {
285 count += sysfs_emit_at(buf, count, "[%s] ", escaped_label);
286 match = true;
287 } else if (available) {
288 count += sysfs_emit_at(buf, count, "%s ", escaped_label);
289 }
290 }
291
292 if (!match) {
293 dev_warn(dev, "driver reporting unavailable enum value %d\n", value);
294 return -EINVAL;
295 }
296
297 if (count)
298 buf[count - 1] = '\n';
299
300 return count;
301 }
302
power_supply_show_charge_behaviour(struct device * dev,struct power_supply * psy,union power_supply_propval * value,char * buf)303 static ssize_t power_supply_show_charge_behaviour(struct device *dev,
304 struct power_supply *psy,
305 union power_supply_propval *value,
306 char *buf)
307 {
308 struct power_supply_ext_registration *reg;
309
310 scoped_guard(rwsem_read, &psy->extensions_sem) {
311 power_supply_for_each_extension(reg, psy) {
312 if (power_supply_ext_has_property(reg->ext,
313 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR))
314 return power_supply_charge_behaviour_show(dev,
315 reg->ext->charge_behaviours,
316 value->intval, buf);
317 }
318 }
319
320 return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
321 value->intval, buf);
322 }
323
power_supply_format_property(struct device * dev,bool uevent,struct device_attribute * attr,char * buf)324 static ssize_t power_supply_format_property(struct device *dev,
325 bool uevent,
326 struct device_attribute *attr,
327 char *buf)
328 {
329 ssize_t ret;
330 struct power_supply *psy = dev_to_psy(dev);
331 const struct power_supply_attr *ps_attr = to_ps_attr(attr);
332 enum power_supply_property psp = dev_attr_psp(attr);
333 union power_supply_propval value;
334
335 if (psp == POWER_SUPPLY_PROP_TYPE) {
336 value.intval = psy->desc->type;
337 } else {
338 ret = power_supply_get_property(psy, psp, &value);
339
340 if (ret < 0) {
341 if (ret == -ENODATA)
342 dev_dbg_ratelimited(dev,
343 "driver has no data for `%s' property\n",
344 attr->attr.name);
345 else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL)
346 dev_err_ratelimited(dev,
347 "driver failed to report `%s' property: %zd\n",
348 attr->attr.name, ret);
349 return ret;
350 }
351 }
352
353 switch (psp) {
354 case POWER_SUPPLY_PROP_USB_TYPE:
355 ret = power_supply_show_enum_with_available(
356 dev, POWER_SUPPLY_USB_TYPE_TEXT,
357 ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT),
358 psy->desc->usb_types, value.intval, buf);
359 break;
360 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
361 if (uevent) /* no possible values in uevents */
362 goto default_format;
363 ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
364 break;
365 case POWER_SUPPLY_PROP_CHARGE_TYPES:
366 if (uevent) /* no possible values in uevents */
367 goto default_format;
368 ret = power_supply_charge_types_show(dev, psy->desc->charge_types,
369 value.intval, buf);
370 break;
371 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
372 ret = sysfs_emit(buf, "%s\n", value.strval);
373 break;
374 default:
375 default_format:
376 if (ps_attr->text_values_len > 0 &&
377 value.intval < ps_attr->text_values_len && value.intval >= 0) {
378 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
379 } else {
380 ret = sysfs_emit(buf, "%d\n", value.intval);
381 }
382 }
383
384 return ret;
385 }
386
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)387 static ssize_t power_supply_show_property(struct device *dev,
388 struct device_attribute *attr,
389 char *buf)
390 {
391 return power_supply_format_property(dev, false, attr, buf);
392 }
393
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)394 static ssize_t power_supply_store_property(struct device *dev,
395 struct device_attribute *attr,
396 const char *buf, size_t count) {
397 ssize_t ret;
398 struct power_supply *psy = dev_to_psy(dev);
399 const struct power_supply_attr *ps_attr = to_ps_attr(attr);
400 enum power_supply_property psp = dev_attr_psp(attr);
401 union power_supply_propval value;
402
403 ret = -EINVAL;
404 if (ps_attr->text_values_len > 0) {
405 ret = power_supply_match_string(ps_attr->text_values,
406 ps_attr->text_values_len, buf);
407 }
408
409 /*
410 * If no match was found, then check to see if it is an integer.
411 * Integer values are valid for enums in addition to the text value.
412 */
413 if (ret < 0) {
414 long long_val;
415
416 ret = kstrtol(buf, 10, &long_val);
417 if (ret < 0)
418 return ret;
419
420 ret = long_val;
421 }
422
423 value.intval = ret;
424
425 ret = power_supply_set_property(psy, psp, &value);
426 if (ret < 0)
427 return ret;
428
429 return count;
430 }
431
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)432 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
433 struct attribute *attr,
434 int attrno)
435 {
436 struct device *dev = kobj_to_dev(kobj);
437 struct power_supply *psy = dev_to_psy(dev);
438 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
439
440 if (!power_supply_attrs[attrno].prop_name)
441 return 0;
442
443 if (attrno == POWER_SUPPLY_PROP_TYPE)
444 return mode;
445
446 guard(rwsem_read)(&psy->extensions_sem);
447
448 if (power_supply_has_property(psy, attrno)) {
449 if (power_supply_property_is_writeable(psy, attrno) > 0)
450 mode |= S_IWUSR;
451 return mode;
452 }
453
454 return 0;
455 }
456
457 static const struct attribute_group power_supply_attr_group = {
458 .attrs = __power_supply_attrs,
459 .is_visible = power_supply_attr_is_visible,
460 };
461
462 static struct attribute *power_supply_extension_attrs[] = {
463 NULL
464 };
465
466 static const struct attribute_group power_supply_extension_group = {
467 .name = "extensions",
468 .attrs = power_supply_extension_attrs,
469 };
470
471 const struct attribute_group *power_supply_attr_groups[] = {
472 &power_supply_attr_group,
473 &power_supply_extension_group,
474 NULL
475 };
476
power_supply_init_attrs(void)477 void __init power_supply_init_attrs(void)
478 {
479 int i;
480
481 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
482 struct device_attribute *attr;
483
484 if (!power_supply_attrs[i].prop_name) {
485 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
486 __func__, i);
487 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
488 } else {
489 string_lower(power_supply_attrs[i].attr_name,
490 power_supply_attrs[i].attr_name);
491 }
492
493 attr = &power_supply_attrs[i].dev_attr;
494
495 attr->attr.name = power_supply_attrs[i].attr_name;
496 attr->show = power_supply_show_property;
497 attr->store = power_supply_store_property;
498 __power_supply_attrs[i] = &attr->attr;
499 }
500 }
501
add_prop_uevent(const struct device * dev,struct kobj_uevent_env * env,enum power_supply_property prop,char * prop_buf)502 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
503 enum power_supply_property prop, char *prop_buf)
504 {
505 int ret = 0;
506 struct power_supply_attr *pwr_attr;
507 struct device_attribute *dev_attr;
508 char *line;
509
510 pwr_attr = &power_supply_attrs[prop];
511 dev_attr = &pwr_attr->dev_attr;
512
513 ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf);
514 if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) {
515 /*
516 * When a battery is absent, we expect -ENODEV. Don't abort;
517 * send the uevent with at least the PRESENT=0 property
518 */
519 return 0;
520 }
521
522 if (ret < 0)
523 return ret;
524
525 line = strchr(prop_buf, '\n');
526 if (line)
527 *line = 0;
528
529 return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
530 pwr_attr->prop_name, prop_buf);
531 }
532
power_supply_uevent(const struct device * dev,struct kobj_uevent_env * env)533 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
534 {
535 const struct power_supply *psy = dev_to_psy(dev);
536 int ret = 0, j;
537 char *prop_buf;
538
539 if (!psy || !psy->desc) {
540 dev_dbg(dev, "No power supply yet\n");
541 return ret;
542 }
543
544 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
545 if (ret)
546 return ret;
547
548 /*
549 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
550 * resources have been freed. Exit early to avoid use-after-free.
551 */
552 if (psy->removing)
553 return 0;
554
555 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
556 if (!prop_buf)
557 return -ENOMEM;
558
559 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
560 if (ret)
561 goto out;
562
563 for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) {
564 ret = add_prop_uevent(dev, env, j, prop_buf);
565 if (ret)
566 goto out;
567 }
568
569 out:
570 free_page((unsigned long)prop_buf);
571
572 return ret;
573 }
574
power_supply_charge_behaviour_show(struct device * dev,unsigned int available_behaviours,enum power_supply_charge_behaviour current_behaviour,char * buf)575 ssize_t power_supply_charge_behaviour_show(struct device *dev,
576 unsigned int available_behaviours,
577 enum power_supply_charge_behaviour current_behaviour,
578 char *buf)
579 {
580 return power_supply_show_enum_with_available(
581 dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT,
582 ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT),
583 available_behaviours, current_behaviour, buf);
584 }
585 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
586
power_supply_charge_behaviour_parse(unsigned int available_behaviours,const char * buf)587 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
588 {
589 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
590
591 if (i < 0)
592 return i;
593
594 if (available_behaviours & BIT(i))
595 return i;
596
597 return -EINVAL;
598 }
599 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
600
power_supply_charge_types_show(struct device * dev,unsigned int available_types,enum power_supply_charge_type current_type,char * buf)601 ssize_t power_supply_charge_types_show(struct device *dev,
602 unsigned int available_types,
603 enum power_supply_charge_type current_type,
604 char *buf)
605 {
606 return power_supply_show_enum_with_available(
607 dev, POWER_SUPPLY_CHARGE_TYPE_TEXT,
608 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
609 available_types, current_type, buf);
610 }
611 EXPORT_SYMBOL_GPL(power_supply_charge_types_show);
612
power_supply_charge_types_parse(unsigned int available_types,const char * buf)613 int power_supply_charge_types_parse(unsigned int available_types, const char *buf)
614 {
615 int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT,
616 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
617 buf);
618
619 if (i < 0)
620 return i;
621
622 if (available_types & BIT(i))
623 return i;
624
625 return -EINVAL;
626 }
627 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse);
628
power_supply_sysfs_add_extension(struct power_supply * psy,const struct power_supply_ext * ext,struct device * dev)629 int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext,
630 struct device *dev)
631 {
632 return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name,
633 &dev->kobj, ext->name);
634 }
635
power_supply_sysfs_remove_extension(struct power_supply * psy,const struct power_supply_ext * ext)636 void power_supply_sysfs_remove_extension(struct power_supply *psy,
637 const struct power_supply_ext *ext)
638 {
639 sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name);
640 }
641