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 };
61
62 static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = {
63 [POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown",
64 [POWER_SUPPLY_USB_TYPE_SDP] = "SDP",
65 [POWER_SUPPLY_USB_TYPE_DCP] = "DCP",
66 [POWER_SUPPLY_USB_TYPE_CDP] = "CDP",
67 [POWER_SUPPLY_USB_TYPE_ACA] = "ACA",
68 [POWER_SUPPLY_USB_TYPE_C] = "C",
69 [POWER_SUPPLY_USB_TYPE_PD] = "PD",
70 [POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP",
71 [POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS",
72 [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID",
73 };
74
75 static const char * const POWER_SUPPLY_STATUS_TEXT[] = {
76 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
77 [POWER_SUPPLY_STATUS_CHARGING] = "Charging",
78 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
79 [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
80 [POWER_SUPPLY_STATUS_FULL] = "Full",
81 };
82
83 static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
84 [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown",
85 [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A",
86 [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle",
87 [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast",
88 [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard",
89 [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive",
90 [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom",
91 [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life",
92 [POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass",
93 };
94
95 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
96 [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown",
97 [POWER_SUPPLY_HEALTH_GOOD] = "Good",
98 [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat",
99 [POWER_SUPPLY_HEALTH_DEAD] = "Dead",
100 [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage",
101 [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure",
102 [POWER_SUPPLY_HEALTH_COLD] = "Cold",
103 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
104 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire",
105 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current",
106 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required",
107 [POWER_SUPPLY_HEALTH_WARM] = "Warm",
108 [POWER_SUPPLY_HEALTH_COOL] = "Cool",
109 [POWER_SUPPLY_HEALTH_HOT] = "Hot",
110 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery",
111 };
112
113 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
114 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown",
115 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH",
116 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion",
117 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly",
118 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe",
119 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd",
120 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn",
121 };
122
123 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
124 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown",
125 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical",
126 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low",
127 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal",
128 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High",
129 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full",
130 };
131
132 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
133 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown",
134 [POWER_SUPPLY_SCOPE_SYSTEM] = "System",
135 [POWER_SUPPLY_SCOPE_DEVICE] = "Device",
136 };
137
138 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
139 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto",
140 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge",
141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
142 };
143
144 static struct power_supply_attr power_supply_attrs[] = {
145 /* Properties of type `int' */
146 POWER_SUPPLY_ENUM_ATTR(STATUS),
147 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
148 POWER_SUPPLY_ENUM_ATTR(HEALTH),
149 POWER_SUPPLY_ATTR(PRESENT),
150 POWER_SUPPLY_ATTR(ONLINE),
151 POWER_SUPPLY_ATTR(AUTHENTIC),
152 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
153 POWER_SUPPLY_ATTR(CYCLE_COUNT),
154 POWER_SUPPLY_ATTR(VOLTAGE_MAX),
155 POWER_SUPPLY_ATTR(VOLTAGE_MIN),
156 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
157 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
158 POWER_SUPPLY_ATTR(VOLTAGE_NOW),
159 POWER_SUPPLY_ATTR(VOLTAGE_AVG),
160 POWER_SUPPLY_ATTR(VOLTAGE_OCV),
161 POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
162 POWER_SUPPLY_ATTR(CURRENT_MAX),
163 POWER_SUPPLY_ATTR(CURRENT_NOW),
164 POWER_SUPPLY_ATTR(CURRENT_AVG),
165 POWER_SUPPLY_ATTR(CURRENT_BOOT),
166 POWER_SUPPLY_ATTR(POWER_NOW),
167 POWER_SUPPLY_ATTR(POWER_AVG),
168 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
169 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
170 POWER_SUPPLY_ATTR(CHARGE_FULL),
171 POWER_SUPPLY_ATTR(CHARGE_EMPTY),
172 POWER_SUPPLY_ATTR(CHARGE_NOW),
173 POWER_SUPPLY_ATTR(CHARGE_AVG),
174 POWER_SUPPLY_ATTR(CHARGE_COUNTER),
175 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
176 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
177 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
179 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
180 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
181 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
183 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
184 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
185 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
186 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
187 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
188 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
189 POWER_SUPPLY_ATTR(ENERGY_FULL),
190 POWER_SUPPLY_ATTR(ENERGY_EMPTY),
191 POWER_SUPPLY_ATTR(ENERGY_NOW),
192 POWER_SUPPLY_ATTR(ENERGY_AVG),
193 POWER_SUPPLY_ATTR(CAPACITY),
194 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
195 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
196 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
197 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
198 POWER_SUPPLY_ATTR(TEMP),
199 POWER_SUPPLY_ATTR(TEMP_MAX),
200 POWER_SUPPLY_ATTR(TEMP_MIN),
201 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
202 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
203 POWER_SUPPLY_ATTR(TEMP_AMBIENT),
204 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
205 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
206 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
207 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
208 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
209 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
210 POWER_SUPPLY_ENUM_ATTR(TYPE),
211 POWER_SUPPLY_ATTR(USB_TYPE),
212 POWER_SUPPLY_ENUM_ATTR(SCOPE),
213 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
214 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
215 POWER_SUPPLY_ATTR(CALIBRATE),
216 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
217 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
218 POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
219 /* Properties of type `const char *' */
220 POWER_SUPPLY_ATTR(MODEL_NAME),
221 POWER_SUPPLY_ATTR(MANUFACTURER),
222 POWER_SUPPLY_ATTR(SERIAL_NUMBER),
223 };
224
225 static struct attribute *
226 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
227
to_ps_attr(struct device_attribute * attr)228 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
229 {
230 return container_of(attr, struct power_supply_attr, dev_attr);
231 }
232
dev_attr_psp(struct device_attribute * attr)233 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
234 {
235 return to_ps_attr(attr) - power_supply_attrs;
236 }
237
power_supply_show_usb_type(struct device * dev,const struct power_supply_desc * desc,union power_supply_propval * value,char * buf)238 static ssize_t power_supply_show_usb_type(struct device *dev,
239 const struct power_supply_desc *desc,
240 union power_supply_propval *value,
241 char *buf)
242 {
243 enum power_supply_usb_type usb_type;
244 ssize_t count = 0;
245 bool match = false;
246 int i;
247
248 for (i = 0; i < desc->num_usb_types; ++i) {
249 usb_type = desc->usb_types[i];
250
251 if (value->intval == usb_type) {
252 count += sysfs_emit_at(buf, count, "[%s] ",
253 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
254 match = true;
255 } else {
256 count += sysfs_emit_at(buf, count, "%s ",
257 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
258 }
259 }
260
261 if (!match) {
262 dev_warn(dev, "driver reporting unsupported connected type\n");
263 return -EINVAL;
264 }
265
266 if (count)
267 buf[count - 1] = '\n';
268
269 return count;
270 }
271
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)272 static ssize_t power_supply_show_property(struct device *dev,
273 struct device_attribute *attr,
274 char *buf) {
275 ssize_t ret;
276 struct power_supply *psy = dev_get_drvdata(dev);
277 struct power_supply_attr *ps_attr = to_ps_attr(attr);
278 enum power_supply_property psp = dev_attr_psp(attr);
279 union power_supply_propval value;
280
281 if (psp == POWER_SUPPLY_PROP_TYPE) {
282 value.intval = psy->desc->type;
283 } else {
284 ret = power_supply_get_property(psy, psp, &value);
285
286 if (ret < 0) {
287 if (ret == -ENODATA)
288 dev_dbg(dev, "driver has no data for `%s' property\n",
289 attr->attr.name);
290 else if (ret != -ENODEV && ret != -EAGAIN)
291 dev_err_ratelimited(dev,
292 "driver failed to report `%s' property: %zd\n",
293 attr->attr.name, ret);
294 return ret;
295 }
296 }
297
298 if (ps_attr->text_values_len > 0 &&
299 value.intval < ps_attr->text_values_len && value.intval >= 0) {
300 return sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
301 }
302
303 switch (psp) {
304 case POWER_SUPPLY_PROP_USB_TYPE:
305 ret = power_supply_show_usb_type(dev, psy->desc,
306 &value, buf);
307 break;
308 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
309 ret = sysfs_emit(buf, "%s\n", value.strval);
310 break;
311 default:
312 ret = sysfs_emit(buf, "%d\n", value.intval);
313 }
314
315 return ret;
316 }
317
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)318 static ssize_t power_supply_store_property(struct device *dev,
319 struct device_attribute *attr,
320 const char *buf, size_t count) {
321 ssize_t ret;
322 struct power_supply *psy = dev_get_drvdata(dev);
323 struct power_supply_attr *ps_attr = to_ps_attr(attr);
324 enum power_supply_property psp = dev_attr_psp(attr);
325 union power_supply_propval value;
326
327 ret = -EINVAL;
328 if (ps_attr->text_values_len > 0) {
329 ret = __sysfs_match_string(ps_attr->text_values,
330 ps_attr->text_values_len, buf);
331 }
332
333 /*
334 * If no match was found, then check to see if it is an integer.
335 * Integer values are valid for enums in addition to the text value.
336 */
337 if (ret < 0) {
338 long long_val;
339
340 ret = kstrtol(buf, 10, &long_val);
341 if (ret < 0)
342 return ret;
343
344 ret = long_val;
345 }
346
347 value.intval = ret;
348
349 ret = power_supply_set_property(psy, psp, &value);
350 if (ret < 0)
351 return ret;
352
353 return count;
354 }
355
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)356 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
357 struct attribute *attr,
358 int attrno)
359 {
360 struct device *dev = kobj_to_dev(kobj);
361 struct power_supply *psy = dev_get_drvdata(dev);
362 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
363 int i;
364
365 if (!power_supply_attrs[attrno].prop_name)
366 return 0;
367
368 if (attrno == POWER_SUPPLY_PROP_TYPE)
369 return mode;
370
371 for (i = 0; i < psy->desc->num_properties; i++) {
372 int property = psy->desc->properties[i];
373
374 if (property == attrno) {
375 if (psy->desc->property_is_writeable &&
376 psy->desc->property_is_writeable(psy, property) > 0)
377 mode |= S_IWUSR;
378
379 return mode;
380 }
381 }
382
383 return 0;
384 }
385
386 static const struct attribute_group power_supply_attr_group = {
387 .attrs = __power_supply_attrs,
388 .is_visible = power_supply_attr_is_visible,
389 };
390
391 static const struct attribute_group *power_supply_attr_groups[] = {
392 &power_supply_attr_group,
393 NULL,
394 };
395
str_to_lower(char * str)396 static void str_to_lower(char *str)
397 {
398 while (*str) {
399 *str = tolower(*str);
400 str++;
401 }
402 }
403
power_supply_init_attrs(struct device_type * dev_type)404 void power_supply_init_attrs(struct device_type *dev_type)
405 {
406 int i;
407
408 dev_type->groups = power_supply_attr_groups;
409
410 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
411 struct device_attribute *attr;
412
413 if (!power_supply_attrs[i].prop_name) {
414 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
415 __func__, i);
416 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
417 } else {
418 str_to_lower(power_supply_attrs[i].attr_name);
419 }
420
421 attr = &power_supply_attrs[i].dev_attr;
422
423 attr->attr.name = power_supply_attrs[i].attr_name;
424 attr->show = power_supply_show_property;
425 attr->store = power_supply_store_property;
426 __power_supply_attrs[i] = &attr->attr;
427 }
428 }
429
add_prop_uevent(const struct device * dev,struct kobj_uevent_env * env,enum power_supply_property prop,char * prop_buf)430 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
431 enum power_supply_property prop, char *prop_buf)
432 {
433 int ret = 0;
434 struct power_supply_attr *pwr_attr;
435 struct device_attribute *dev_attr;
436 char *line;
437
438 pwr_attr = &power_supply_attrs[prop];
439 dev_attr = &pwr_attr->dev_attr;
440
441 ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf);
442 if (ret == -ENODEV || ret == -ENODATA) {
443 /*
444 * When a battery is absent, we expect -ENODEV. Don't abort;
445 * send the uevent with at least the PRESENT=0 property
446 */
447 return 0;
448 }
449
450 if (ret < 0)
451 return ret;
452
453 line = strchr(prop_buf, '\n');
454 if (line)
455 *line = 0;
456
457 return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
458 pwr_attr->prop_name, prop_buf);
459 }
460
power_supply_uevent(const struct device * dev,struct kobj_uevent_env * env)461 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
462 {
463 const struct power_supply *psy = dev_get_drvdata(dev);
464 int ret = 0, j;
465 char *prop_buf;
466
467 if (!psy || !psy->desc) {
468 dev_dbg(dev, "No power supply yet\n");
469 return ret;
470 }
471
472 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
473 if (ret)
474 return ret;
475
476 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
477 if (!prop_buf)
478 return -ENOMEM;
479
480 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
481 if (ret)
482 goto out;
483
484 for (j = 0; j < psy->desc->num_properties; j++) {
485 ret = add_prop_uevent(dev, env, psy->desc->properties[j],
486 prop_buf);
487 if (ret)
488 goto out;
489 }
490
491 out:
492 free_page((unsigned long)prop_buf);
493
494 return ret;
495 }
496
power_supply_charge_behaviour_show(struct device * dev,unsigned int available_behaviours,enum power_supply_charge_behaviour current_behaviour,char * buf)497 ssize_t power_supply_charge_behaviour_show(struct device *dev,
498 unsigned int available_behaviours,
499 enum power_supply_charge_behaviour current_behaviour,
500 char *buf)
501 {
502 bool match = false, available, active;
503 ssize_t count = 0;
504 int i;
505
506 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
507 available = available_behaviours & BIT(i);
508 active = i == current_behaviour;
509
510 if (available && active) {
511 count += sysfs_emit_at(buf, count, "[%s] ",
512 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
513 match = true;
514 } else if (available) {
515 count += sysfs_emit_at(buf, count, "%s ",
516 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
517 }
518 }
519
520 if (!match) {
521 dev_warn(dev, "driver reporting unsupported charge behaviour\n");
522 return -EINVAL;
523 }
524
525 if (count)
526 buf[count - 1] = '\n';
527
528 return count;
529 }
530 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
531
power_supply_charge_behaviour_parse(unsigned int available_behaviours,const char * buf)532 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
533 {
534 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
535
536 if (i < 0)
537 return i;
538
539 if (available_behaviours & BIT(i))
540 return i;
541
542 return -EINVAL;
543 }
544 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
545