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 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
225 
226 static struct attribute *
227 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
228 
229 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
230 {
231 	return container_of(attr, struct power_supply_attr, dev_attr);
232 }
233 
234 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
235 {
236 	return  to_ps_attr(attr) - power_supply_attrs;
237 }
238 
239 static ssize_t power_supply_show_usb_type(struct device *dev,
240 					  const struct power_supply_desc *desc,
241 					  union power_supply_propval *value,
242 					  char *buf)
243 {
244 	enum power_supply_usb_type usb_type;
245 	ssize_t count = 0;
246 	bool match = false;
247 	int i;
248 
249 	for (i = 0; i < desc->num_usb_types; ++i) {
250 		usb_type = desc->usb_types[i];
251 
252 		if (value->intval == usb_type) {
253 			count += sysfs_emit_at(buf, count, "[%s] ",
254 					 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
255 			match = true;
256 		} else {
257 			count += sysfs_emit_at(buf, count, "%s ",
258 					 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
259 		}
260 	}
261 
262 	if (!match) {
263 		dev_warn(dev, "driver reporting unsupported connected type\n");
264 		return -EINVAL;
265 	}
266 
267 	if (count)
268 		buf[count - 1] = '\n';
269 
270 	return count;
271 }
272 
273 static ssize_t power_supply_show_property(struct device *dev,
274 					  struct device_attribute *attr,
275 					  char *buf) {
276 	ssize_t ret;
277 	struct power_supply *psy = dev_get_drvdata(dev);
278 	struct power_supply_attr *ps_attr = to_ps_attr(attr);
279 	enum power_supply_property psp = dev_attr_psp(attr);
280 	union power_supply_propval value;
281 
282 	if (psp == POWER_SUPPLY_PROP_TYPE) {
283 		value.intval = psy->desc->type;
284 	} else {
285 		ret = power_supply_get_property(psy, psp, &value);
286 
287 		if (ret < 0) {
288 			if (ret == -ENODATA)
289 				dev_dbg_ratelimited(dev,
290 					"driver has no data for `%s' property\n",
291 					attr->attr.name);
292 			else if (ret != -ENODEV && ret != -EAGAIN)
293 				dev_err_ratelimited(dev,
294 					"driver failed to report `%s' property: %zd\n",
295 					attr->attr.name, ret);
296 			return ret;
297 		}
298 	}
299 
300 	if (ps_attr->text_values_len > 0 &&
301 	    value.intval < ps_attr->text_values_len && value.intval >= 0) {
302 		return sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
303 	}
304 
305 	switch (psp) {
306 	case POWER_SUPPLY_PROP_USB_TYPE:
307 		ret = power_supply_show_usb_type(dev, psy->desc,
308 						&value, buf);
309 		break;
310 	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
311 		ret = sysfs_emit(buf, "%s\n", value.strval);
312 		break;
313 	default:
314 		ret = sysfs_emit(buf, "%d\n", value.intval);
315 	}
316 
317 	return ret;
318 }
319 
320 static ssize_t power_supply_store_property(struct device *dev,
321 					   struct device_attribute *attr,
322 					   const char *buf, size_t count) {
323 	ssize_t ret;
324 	struct power_supply *psy = dev_get_drvdata(dev);
325 	struct power_supply_attr *ps_attr = to_ps_attr(attr);
326 	enum power_supply_property psp = dev_attr_psp(attr);
327 	union power_supply_propval value;
328 
329 	ret = -EINVAL;
330 	if (ps_attr->text_values_len > 0) {
331 		ret = __sysfs_match_string(ps_attr->text_values,
332 					   ps_attr->text_values_len, buf);
333 	}
334 
335 	/*
336 	 * If no match was found, then check to see if it is an integer.
337 	 * Integer values are valid for enums in addition to the text value.
338 	 */
339 	if (ret < 0) {
340 		long long_val;
341 
342 		ret = kstrtol(buf, 10, &long_val);
343 		if (ret < 0)
344 			return ret;
345 
346 		ret = long_val;
347 	}
348 
349 	value.intval = ret;
350 
351 	ret = power_supply_set_property(psy, psp, &value);
352 	if (ret < 0)
353 		return ret;
354 
355 	return count;
356 }
357 
358 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
359 					   struct attribute *attr,
360 					   int attrno)
361 {
362 	struct device *dev = kobj_to_dev(kobj);
363 	struct power_supply *psy = dev_get_drvdata(dev);
364 	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
365 	int i;
366 
367 	if (!power_supply_attrs[attrno].prop_name)
368 		return 0;
369 
370 	if (attrno == POWER_SUPPLY_PROP_TYPE)
371 		return mode;
372 
373 	for (i = 0; i < psy->desc->num_properties; i++) {
374 		int property = psy->desc->properties[i];
375 
376 		if (property == attrno) {
377 			if (psy->desc->property_is_writeable &&
378 			    psy->desc->property_is_writeable(psy, property) > 0)
379 				mode |= S_IWUSR;
380 
381 			return mode;
382 		}
383 	}
384 
385 	if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
386 		return mode;
387 
388 	return 0;
389 }
390 
391 static const struct attribute_group power_supply_attr_group = {
392 	.attrs = __power_supply_attrs,
393 	.is_visible = power_supply_attr_is_visible,
394 };
395 
396 static const struct attribute_group *power_supply_attr_groups[] = {
397 	&power_supply_attr_group,
398 	NULL,
399 };
400 
401 static void str_to_lower(char *str)
402 {
403 	while (*str) {
404 		*str = tolower(*str);
405 		str++;
406 	}
407 }
408 
409 void power_supply_init_attrs(struct device_type *dev_type)
410 {
411 	int i;
412 
413 	dev_type->groups = power_supply_attr_groups;
414 
415 	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
416 		struct device_attribute *attr;
417 
418 		if (!power_supply_attrs[i].prop_name) {
419 			pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
420 				__func__, i);
421 			sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
422 		} else {
423 			str_to_lower(power_supply_attrs[i].attr_name);
424 		}
425 
426 		attr = &power_supply_attrs[i].dev_attr;
427 
428 		attr->attr.name = power_supply_attrs[i].attr_name;
429 		attr->show = power_supply_show_property;
430 		attr->store = power_supply_store_property;
431 		__power_supply_attrs[i] = &attr->attr;
432 	}
433 }
434 
435 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
436 			   enum power_supply_property prop, char *prop_buf)
437 {
438 	int ret = 0;
439 	struct power_supply_attr *pwr_attr;
440 	struct device_attribute *dev_attr;
441 	char *line;
442 
443 	pwr_attr = &power_supply_attrs[prop];
444 	dev_attr = &pwr_attr->dev_attr;
445 
446 	ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf);
447 	if (ret == -ENODEV || ret == -ENODATA) {
448 		/*
449 		 * When a battery is absent, we expect -ENODEV. Don't abort;
450 		 * send the uevent with at least the PRESENT=0 property
451 		 */
452 		return 0;
453 	}
454 
455 	if (ret < 0)
456 		return ret;
457 
458 	line = strchr(prop_buf, '\n');
459 	if (line)
460 		*line = 0;
461 
462 	return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
463 			      pwr_attr->prop_name, prop_buf);
464 }
465 
466 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
467 {
468 	const struct power_supply *psy = dev_get_drvdata(dev);
469 	const enum power_supply_property *battery_props =
470 		power_supply_battery_info_properties;
471 	unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
472 					 sizeof(unsigned long) + 1] = {0};
473 	int ret = 0, j;
474 	char *prop_buf;
475 
476 	if (!psy || !psy->desc) {
477 		dev_dbg(dev, "No power supply yet\n");
478 		return ret;
479 	}
480 
481 	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
482 	if (ret)
483 		return ret;
484 
485 	/*
486 	 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
487 	 * resources have been freed. Exit early to avoid use-after-free.
488 	 */
489 	if (psy->removing)
490 		return 0;
491 
492 	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
493 	if (!prop_buf)
494 		return -ENOMEM;
495 
496 	ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
497 	if (ret)
498 		goto out;
499 
500 	for (j = 0; j < psy->desc->num_properties; j++) {
501 		set_bit(psy->desc->properties[j], psy_drv_properties);
502 		ret = add_prop_uevent(dev, env, psy->desc->properties[j],
503 				      prop_buf);
504 		if (ret)
505 			goto out;
506 	}
507 
508 	for (j = 0; j < power_supply_battery_info_properties_size; j++) {
509 		if (test_bit(battery_props[j], psy_drv_properties))
510 			continue;
511 		if (!power_supply_battery_info_has_prop(psy->battery_info,
512 				battery_props[j]))
513 			continue;
514 		ret = add_prop_uevent(dev, env, battery_props[j],
515 			      prop_buf);
516 		if (ret)
517 			goto out;
518 	}
519 
520 out:
521 	free_page((unsigned long)prop_buf);
522 
523 	return ret;
524 }
525 
526 ssize_t power_supply_charge_behaviour_show(struct device *dev,
527 					   unsigned int available_behaviours,
528 					   enum power_supply_charge_behaviour current_behaviour,
529 					   char *buf)
530 {
531 	bool match = false, available, active;
532 	ssize_t count = 0;
533 	int i;
534 
535 	for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
536 		available = available_behaviours & BIT(i);
537 		active = i == current_behaviour;
538 
539 		if (available && active) {
540 			count += sysfs_emit_at(buf, count, "[%s] ",
541 					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
542 			match = true;
543 		} else if (available) {
544 			count += sysfs_emit_at(buf, count, "%s ",
545 					       POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
546 		}
547 	}
548 
549 	if (!match) {
550 		dev_warn(dev, "driver reporting unsupported charge behaviour\n");
551 		return -EINVAL;
552 	}
553 
554 	if (count)
555 		buf[count - 1] = '\n';
556 
557 	return count;
558 }
559 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
560 
561 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
562 {
563 	int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
564 
565 	if (i < 0)
566 		return i;
567 
568 	if (available_behaviours & BIT(i))
569 		return i;
570 
571 	return -EINVAL;
572 }
573 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
574