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 
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 
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 
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 += sprintf(buf + count, "[%s] ",
253 					 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
254 			match = true;
255 		} else {
256 			count += sprintf(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 
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 sprintf(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 = sprintf(buf, "%s\n", value.strval);
310 		break;
311 	default:
312 		ret = sprintf(buf, "%d\n", value.intval);
313 	}
314 
315 	return ret;
316 }
317 
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 
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 
396 static void str_to_lower(char *str)
397 {
398 	while (*str) {
399 		*str = tolower(*str);
400 		str++;
401 	}
402 }
403 
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 
430 static int add_prop_uevent(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(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 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 
461 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
462 {
463 	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 
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 
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