power_supply_sysfs.c

  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
 24struct 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
 47static 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
 63static 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
 76static 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
 84static 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
 96static 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
117static 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
127static 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
136static 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
142static 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
149static 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	POWER_SUPPLY_ATTR(INTERNAL_RESISTANCE),
227	POWER_SUPPLY_ATTR(STATE_OF_HEALTH),
228	/* Properties of type `const char *' */
229	POWER_SUPPLY_ATTR(MODEL_NAME),
230	POWER_SUPPLY_ATTR(MANUFACTURER),
231	POWER_SUPPLY_ATTR(SERIAL_NUMBER),
232};
233#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
234
235static struct attribute *
236__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init;
237
238static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
239{
240	return container_of(attr, struct power_supply_attr, dev_attr);
241}
242
243static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
244{
245	return  to_ps_attr(attr) - power_supply_attrs;
246}
247
248static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize)
249{
250	strscpy(buf, str, bufsize);
251	strreplace(buf, ' ', '_');
252}
253
254static int power_supply_match_string(const char * const *array, size_t n, const char *s)
255{
256	int ret;
257
258	/* First try an exact match */
259	ret = __sysfs_match_string(array, n, s);
260	if (ret >= 0)
261		return ret;
262
263	/* Second round, try matching with spaces replaced by '_' */
264	for (size_t i = 0; i < n; i++) {
265		char buf[32];
266
267		power_supply_escape_spaces(array[i], buf, sizeof(buf));
268		if (sysfs_streq(buf, s))
269			return i;
270	}
271
272	return -EINVAL;
273}
274
275static ssize_t power_supply_show_enum_with_available(
276			struct device *dev, const char * const labels[], int label_count,
277			unsigned int available_values, int value, char *buf)
278{
279	bool match = false, available, active;
280	char escaped_label[32];
281	ssize_t count = 0;
282	int i;
283
284	for (i = 0; i < label_count; i++) {
285		available = available_values & BIT(i);
286		active = i == value;
287		power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label));
288
289		if (available && active) {
290			count += sysfs_emit_at(buf, count, "[%s] ", escaped_label);
291			match = true;
292		} else if (available) {
293			count += sysfs_emit_at(buf, count, "%s ", escaped_label);
294		}
295	}
296
297	if (!match) {
298		dev_warn(dev, "driver reporting unavailable enum value %d\n", value);
299		return -EINVAL;
300	}
301
302	if (count)
303		buf[count - 1] = '\n';
304
305	return count;
306}
307
308static ssize_t power_supply_show_charge_behaviour(struct device *dev,
309						  struct power_supply *psy,
310						  union power_supply_propval *value,
311						  char *buf)
312{
313	struct power_supply_ext_registration *reg;
314
315	scoped_guard(rwsem_read, &psy->extensions_sem) {
316		power_supply_for_each_extension(reg, psy) {
317			if (power_supply_ext_has_property(reg->ext,
318							  POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR))
319				return power_supply_charge_behaviour_show(dev,
320						reg->ext->charge_behaviours,
321						value->intval, buf);
322		}
323	}
324
325	return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
326						  value->intval, buf);
327}
328
329static ssize_t power_supply_show_charge_types(struct device *dev,
330					      struct power_supply *psy,
331					      enum power_supply_charge_type current_type,
332					      char *buf)
333{
334	struct power_supply_ext_registration *reg;
335
336	scoped_guard(rwsem_read, &psy->extensions_sem) {
337		power_supply_for_each_extension(reg, psy) {
338			if (power_supply_ext_has_property(reg->ext,
339							  POWER_SUPPLY_PROP_CHARGE_TYPES))
340				return power_supply_charge_types_show(dev,
341						reg->ext->charge_types,
342						current_type, buf);
343		}
344	}
345
346	return power_supply_charge_types_show(dev, psy->desc->charge_types,
347						  current_type, buf);
348}
349
350static ssize_t power_supply_format_property(struct device *dev,
351					    bool uevent,
352					    struct device_attribute *attr,
353					    char *buf)
354{
355	ssize_t ret;
356	struct power_supply *psy = dev_to_psy(dev);
357	const struct power_supply_attr *ps_attr = to_ps_attr(attr);
358	enum power_supply_property psp = dev_attr_psp(attr);
359	union power_supply_propval value;
360
361	if (psp == POWER_SUPPLY_PROP_TYPE) {
362		value.intval = psy->desc->type;
363	} else {
364		ret = power_supply_get_property(psy, psp, &value);
365
366		if (ret < 0) {
367			if (ret == -ENODATA)
368				dev_dbg_ratelimited(dev,
369					"driver has no data for `%s' property\n",
370					attr->attr.name);
371			else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL)
372				dev_err_ratelimited(dev,
373					"driver failed to report `%s' property: %zd\n",
374					attr->attr.name, ret);
375			return ret;
376		}
377	}
378
379	switch (psp) {
380	case POWER_SUPPLY_PROP_USB_TYPE:
381		ret = power_supply_show_enum_with_available(
382				dev, POWER_SUPPLY_USB_TYPE_TEXT,
383				ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT),
384				psy->desc->usb_types, value.intval, buf);
385		break;
386	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
387		if (uevent) /* no possible values in uevents */
388			goto default_format;
389		ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
390		break;
391	case POWER_SUPPLY_PROP_CHARGE_TYPES:
392		if (uevent) /* no possible values in uevents */
393			goto default_format;
394		ret = power_supply_show_charge_types(dev, psy,
395						     value.intval, buf);
396		break;
397	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
398		ret = sysfs_emit(buf, "%s\n", value.strval);
399		break;
400	default:
401default_format:
402		if (ps_attr->text_values_len > 0 &&
403				value.intval < ps_attr->text_values_len && value.intval >= 0) {
404			ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
405		} else {
406			ret = sysfs_emit(buf, "%d\n", value.intval);
407		}
408	}
409
410	return ret;
411}
412
413static ssize_t power_supply_show_property(struct device *dev,
414					  struct device_attribute *attr,
415					  char *buf)
416{
417	return power_supply_format_property(dev, false, attr, buf);
418}
419
420static ssize_t power_supply_store_property(struct device *dev,
421					   struct device_attribute *attr,
422					   const char *buf, size_t count) {
423	ssize_t ret;
424	struct power_supply *psy = dev_to_psy(dev);
425	const struct power_supply_attr *ps_attr = to_ps_attr(attr);
426	enum power_supply_property psp = dev_attr_psp(attr);
427	union power_supply_propval value;
428
429	ret = -EINVAL;
430	if (ps_attr->text_values_len > 0) {
431		ret = power_supply_match_string(ps_attr->text_values,
432						ps_attr->text_values_len, buf);
433	}
434
435	/*
436	 * If no match was found, then check to see if it is an integer.
437	 * Integer values are valid for enums in addition to the text value.
438	 */
439	if (ret < 0) {
440		long long_val;
441
442		ret = kstrtol(buf, 10, &long_val);
443		if (ret < 0)
444			return ret;
445
446		ret = long_val;
447	}
448
449	value.intval = ret;
450
451	ret = power_supply_set_property(psy, psp, &value);
452	if (ret < 0)
453		return ret;
454
455	return count;
456}
457
458static umode_t power_supply_attr_is_visible(struct kobject *kobj,
459					   struct attribute *attr,
460					   int attrno)
461{
462	struct device *dev = kobj_to_dev(kobj);
463	struct power_supply *psy = dev_to_psy(dev);
464	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
465
466	if (!power_supply_attrs[attrno].prop_name)
467		return 0;
468
469	if (attrno == POWER_SUPPLY_PROP_TYPE)
470		return mode;
471
472	guard(rwsem_read)(&psy->extensions_sem);
473
474	if (power_supply_has_property(psy, attrno)) {
475		if (power_supply_property_is_writeable(psy, attrno) > 0)
476			mode |= S_IWUSR;
477		return mode;
478	}
479
480	return 0;
481}
482
483static const struct attribute_group power_supply_attr_group = {
484	.attrs = __power_supply_attrs,
485	.is_visible = power_supply_attr_is_visible,
486};
487
488static struct attribute *power_supply_extension_attrs[] = {
489	NULL
490};
491
492static const struct attribute_group power_supply_extension_group = {
493	.name = "extensions",
494	.attrs = power_supply_extension_attrs,
495};
496
497const struct attribute_group *power_supply_attr_groups[] = {
498	&power_supply_attr_group,
499	&power_supply_extension_group,
500	NULL
501};
502
503void __init power_supply_init_attrs(void)
504{
505	int i;
506
507	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
508		struct device_attribute *attr;
509
510		if (!power_supply_attrs[i].prop_name) {
511			pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
512				__func__, i);
513			sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
514		} else {
515			string_lower(power_supply_attrs[i].attr_name,
516				     power_supply_attrs[i].attr_name);
517		}
518
519		attr = &power_supply_attrs[i].dev_attr;
520
521		attr->attr.name = power_supply_attrs[i].attr_name;
522		attr->show = power_supply_show_property;
523		attr->store = power_supply_store_property;
524		__power_supply_attrs[i] = &attr->attr;
525	}
526}
527
528static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
529			   enum power_supply_property prop, char *prop_buf)
530{
531	int ret = 0;
532	struct power_supply_attr *pwr_attr;
533	struct device_attribute *dev_attr;
534	char *line;
535
536	pwr_attr = &power_supply_attrs[prop];
537	dev_attr = &pwr_attr->dev_attr;
538
539	ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf);
540	if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) {
541		/*
542		 * When a battery is absent, we expect -ENODEV. Don't abort;
543		 * send the uevent with at least the PRESENT=0 property
544		 */
545		return 0;
546	}
547
548	if (ret < 0)
549		return ret;
550
551	line = strchr(prop_buf, '\n');
552	if (line)
553		*line = 0;
554
555	return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
556			      pwr_attr->prop_name, prop_buf);
557}
558
559int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
560{
561	const struct power_supply *psy = dev_to_psy(dev);
562	int ret = 0, j;
563	char *prop_buf;
564
565	if (!psy || !psy->desc) {
566		dev_dbg(dev, "No power supply yet\n");
567		return ret;
568	}
569
570	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
571	if (ret)
572		return ret;
573
574	/*
575	 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
576	 * resources have been freed. Exit early to avoid use-after-free.
577	 */
578	if (psy->removing)
579		return 0;
580
581	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
582	if (!prop_buf)
583		return -ENOMEM;
584
585	ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
586	if (ret)
587		goto out;
588
589	for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) {
590		ret = add_prop_uevent(dev, env, j, prop_buf);
591		if (ret)
592			goto out;
593	}
594
595out:
596	free_page((unsigned long)prop_buf);
597
598	return ret;
599}
600
601ssize_t power_supply_charge_behaviour_show(struct device *dev,
602					   unsigned int available_behaviours,
603					   enum power_supply_charge_behaviour current_behaviour,
604					   char *buf)
605{
606	return power_supply_show_enum_with_available(
607				dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT,
608				ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT),
609				available_behaviours, current_behaviour, buf);
610}
611EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
612
613int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
614{
615	int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
616
617	if (i < 0)
618		return i;
619
620	if (available_behaviours & BIT(i))
621		return i;
622
623	return -EINVAL;
624}
625EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
626
627ssize_t power_supply_charge_types_show(struct device *dev,
628				       unsigned int available_types,
629				       enum power_supply_charge_type current_type,
630				       char *buf)
631{
632	return power_supply_show_enum_with_available(
633				dev, POWER_SUPPLY_CHARGE_TYPE_TEXT,
634				ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
635				available_types, current_type, buf);
636}
637EXPORT_SYMBOL_GPL(power_supply_charge_types_show);
638
639int power_supply_charge_types_parse(unsigned int available_types, const char *buf)
640{
641	int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT,
642					  ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT),
643					  buf);
644
645	if (i < 0)
646		return i;
647
648	if (available_types & BIT(i))
649		return i;
650
651	return -EINVAL;
652}
653EXPORT_SYMBOL_GPL(power_supply_charge_types_parse);
654
655int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext,
656				     struct device *dev)
657{
658	return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name,
659				       &dev->kobj, ext->name);
660}
661
662void power_supply_sysfs_remove_extension(struct power_supply *psy,
663					 const struct power_supply_ext *ext)
664{
665	sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name);
666}