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 [POWER_SUPPLY_CHARGE_TYPE_TAPER_EXT] = "Taper",
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_UNSPEC_FAILURE] = "Unspecified failure",
103 [POWER_SUPPLY_HEALTH_COLD] = "Cold",
104 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
105 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire",
106 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current",
107 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required",
108 [POWER_SUPPLY_HEALTH_WARM] = "Warm",
109 [POWER_SUPPLY_HEALTH_COOL] = "Cool",
110 [POWER_SUPPLY_HEALTH_HOT] = "Hot",
111 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery",
112 };
113
114 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
115 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown",
116 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH",
117 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion",
118 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly",
119 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe",
120 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd",
121 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn",
122 };
123
124 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
125 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown",
126 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical",
127 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low",
128 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal",
129 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High",
130 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full",
131 };
132
133 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
134 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown",
135 [POWER_SUPPLY_SCOPE_SYSTEM] = "System",
136 [POWER_SUPPLY_SCOPE_DEVICE] = "Device",
137 };
138
139 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
140 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto",
141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge",
142 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
143 };
144
145 static struct power_supply_attr power_supply_attrs[] = {
146 /* Properties of type `int' */
147 POWER_SUPPLY_ENUM_ATTR(STATUS),
148 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
149 POWER_SUPPLY_ENUM_ATTR(HEALTH),
150 POWER_SUPPLY_ATTR(PRESENT),
151 POWER_SUPPLY_ATTR(ONLINE),
152 POWER_SUPPLY_ATTR(AUTHENTIC),
153 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
154 POWER_SUPPLY_ATTR(CYCLE_COUNT),
155 POWER_SUPPLY_ATTR(VOLTAGE_MAX),
156 POWER_SUPPLY_ATTR(VOLTAGE_MIN),
157 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
158 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
159 POWER_SUPPLY_ATTR(VOLTAGE_NOW),
160 POWER_SUPPLY_ATTR(VOLTAGE_AVG),
161 POWER_SUPPLY_ATTR(VOLTAGE_OCV),
162 POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
163 POWER_SUPPLY_ATTR(CURRENT_MAX),
164 POWER_SUPPLY_ATTR(CURRENT_NOW),
165 POWER_SUPPLY_ATTR(CURRENT_AVG),
166 POWER_SUPPLY_ATTR(CURRENT_BOOT),
167 POWER_SUPPLY_ATTR(POWER_NOW),
168 POWER_SUPPLY_ATTR(POWER_AVG),
169 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
170 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
171 POWER_SUPPLY_ATTR(CHARGE_FULL),
172 POWER_SUPPLY_ATTR(CHARGE_EMPTY),
173 POWER_SUPPLY_ATTR(CHARGE_NOW),
174 POWER_SUPPLY_ATTR(CHARGE_AVG),
175 POWER_SUPPLY_ATTR(CHARGE_COUNTER),
176 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
177 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
179 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
180 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
181 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
183 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
184 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR),
185 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
186 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
187 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
188 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
189 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
190 POWER_SUPPLY_ATTR(ENERGY_FULL),
191 POWER_SUPPLY_ATTR(ENERGY_EMPTY),
192 POWER_SUPPLY_ATTR(ENERGY_NOW),
193 POWER_SUPPLY_ATTR(ENERGY_AVG),
194 POWER_SUPPLY_ATTR(CAPACITY),
195 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
196 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
197 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
198 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
199 POWER_SUPPLY_ATTR(TEMP),
200 POWER_SUPPLY_ATTR(TEMP_MAX),
201 POWER_SUPPLY_ATTR(TEMP_MIN),
202 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
203 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
204 POWER_SUPPLY_ATTR(TEMP_AMBIENT),
205 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
206 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
207 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
208 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
209 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
210 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
211 POWER_SUPPLY_ENUM_ATTR(TYPE),
212 POWER_SUPPLY_ATTR(USB_TYPE),
213 POWER_SUPPLY_ENUM_ATTR(SCOPE),
214 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
215 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
216 POWER_SUPPLY_ATTR(CALIBRATE),
217 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
218 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
219 POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
220 /* Properties of type `const char *' */
221 POWER_SUPPLY_ATTR(MODEL_NAME),
222 POWER_SUPPLY_ATTR(MANUFACTURER),
223 POWER_SUPPLY_ATTR(SERIAL_NUMBER),
224 };
225 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
226
227 static struct attribute *
228 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
229
to_ps_attr(struct device_attribute * attr)230 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
231 {
232 return container_of(attr, struct power_supply_attr, dev_attr);
233 }
234
dev_attr_psp(struct device_attribute * attr)235 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
236 {
237 return to_ps_attr(attr) - power_supply_attrs;
238 }
239
power_supply_show_usb_type(struct device * dev,const struct power_supply_desc * desc,union power_supply_propval * value,char * buf)240 static ssize_t power_supply_show_usb_type(struct device *dev,
241 const struct power_supply_desc *desc,
242 union power_supply_propval *value,
243 char *buf)
244 {
245 enum power_supply_usb_type usb_type;
246 ssize_t count = 0;
247 bool match = false;
248 int i;
249
250 for (i = 0; i < desc->num_usb_types; ++i) {
251 usb_type = desc->usb_types[i];
252
253 if (value->intval == usb_type) {
254 count += sysfs_emit_at(buf, count, "[%s] ",
255 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
256 match = true;
257 } else {
258 count += sysfs_emit_at(buf, count, "%s ",
259 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
260 }
261 }
262
263 if (!match) {
264 dev_warn(dev, "driver reporting unsupported connected type\n");
265 return -EINVAL;
266 }
267
268 if (count)
269 buf[count - 1] = '\n';
270
271 return count;
272 }
273
power_supply_show_property(struct device * dev,struct device_attribute * attr,char * buf)274 static ssize_t power_supply_show_property(struct device *dev,
275 struct device_attribute *attr,
276 char *buf) {
277 ssize_t ret;
278 struct power_supply *psy = dev_get_drvdata(dev);
279 struct power_supply_attr *ps_attr = to_ps_attr(attr);
280 enum power_supply_property psp = dev_attr_psp(attr);
281 union power_supply_propval value;
282
283 if (psp == POWER_SUPPLY_PROP_TYPE) {
284 value.intval = psy->desc->type;
285 } else {
286 ret = power_supply_get_property(psy, psp, &value);
287
288 if (ret < 0) {
289 if (ret == -ENODATA)
290 dev_dbg_ratelimited(dev,
291 "driver has no data for `%s' property\n",
292 attr->attr.name);
293 else if (ret != -ENODEV && ret != -EAGAIN)
294 dev_err_ratelimited(dev,
295 "driver failed to report `%s' property: %zd\n",
296 attr->attr.name, ret);
297 return ret;
298 }
299 }
300
301 if (ps_attr->text_values_len > 0 &&
302 value.intval < ps_attr->text_values_len && value.intval >= 0) {
303 return sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]);
304 }
305
306 switch (psp) {
307 case POWER_SUPPLY_PROP_USB_TYPE:
308 ret = power_supply_show_usb_type(dev, psy->desc,
309 &value, buf);
310 break;
311 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
312 ret = sysfs_emit(buf, "%s\n", value.strval);
313 break;
314 default:
315 ret = sysfs_emit(buf, "%d\n", value.intval);
316 }
317
318 return ret;
319 }
320
power_supply_store_property(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)321 static ssize_t power_supply_store_property(struct device *dev,
322 struct device_attribute *attr,
323 const char *buf, size_t count) {
324 ssize_t ret;
325 struct power_supply *psy = dev_get_drvdata(dev);
326 struct power_supply_attr *ps_attr = to_ps_attr(attr);
327 enum power_supply_property psp = dev_attr_psp(attr);
328 union power_supply_propval value;
329
330 ret = -EINVAL;
331 if (ps_attr->text_values_len > 0) {
332 ret = __sysfs_match_string(ps_attr->text_values,
333 ps_attr->text_values_len, buf);
334 }
335
336 /*
337 * If no match was found, then check to see if it is an integer.
338 * Integer values are valid for enums in addition to the text value.
339 */
340 if (ret < 0) {
341 long long_val;
342
343 ret = kstrtol(buf, 10, &long_val);
344 if (ret < 0)
345 return ret;
346
347 ret = long_val;
348 }
349
350 value.intval = ret;
351
352 ret = power_supply_set_property(psy, psp, &value);
353 if (ret < 0)
354 return ret;
355
356 return count;
357 }
358
power_supply_attr_is_visible(struct kobject * kobj,struct attribute * attr,int attrno)359 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
360 struct attribute *attr,
361 int attrno)
362 {
363 struct device *dev = kobj_to_dev(kobj);
364 struct power_supply *psy = dev_get_drvdata(dev);
365 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
366 int i;
367
368 if (!power_supply_attrs[attrno].prop_name)
369 return 0;
370
371 if (attrno == POWER_SUPPLY_PROP_TYPE)
372 return mode;
373
374 for (i = 0; i < psy->desc->num_properties; i++) {
375 int property = psy->desc->properties[i];
376
377 if (property == attrno) {
378 if (psy->desc->property_is_writeable &&
379 psy->desc->property_is_writeable(psy, property) > 0)
380 mode |= S_IWUSR;
381
382 return mode;
383 }
384 }
385
386 if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
387 return mode;
388
389 return 0;
390 }
391
392 static const struct attribute_group power_supply_attr_group = {
393 .attrs = __power_supply_attrs,
394 .is_visible = power_supply_attr_is_visible,
395 };
396
397 static const struct attribute_group *power_supply_attr_groups[] = {
398 &power_supply_attr_group,
399 NULL,
400 };
401
str_to_lower(char * str)402 static void str_to_lower(char *str)
403 {
404 while (*str) {
405 *str = tolower(*str);
406 str++;
407 }
408 }
409
power_supply_init_attrs(struct device_type * dev_type)410 void power_supply_init_attrs(struct device_type *dev_type)
411 {
412 int i;
413
414 dev_type->groups = power_supply_attr_groups;
415
416 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
417 struct device_attribute *attr;
418
419 if (!power_supply_attrs[i].prop_name) {
420 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
421 __func__, i);
422 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
423 } else {
424 str_to_lower(power_supply_attrs[i].attr_name);
425 }
426
427 attr = &power_supply_attrs[i].dev_attr;
428
429 attr->attr.name = power_supply_attrs[i].attr_name;
430 attr->show = power_supply_show_property;
431 attr->store = power_supply_store_property;
432 __power_supply_attrs[i] = &attr->attr;
433 }
434 }
435
add_prop_uevent(const struct device * dev,struct kobj_uevent_env * env,enum power_supply_property prop,char * prop_buf)436 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env,
437 enum power_supply_property prop, char *prop_buf)
438 {
439 int ret = 0;
440 struct power_supply_attr *pwr_attr;
441 struct device_attribute *dev_attr;
442 char *line;
443
444 pwr_attr = &power_supply_attrs[prop];
445 dev_attr = &pwr_attr->dev_attr;
446
447 ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf);
448 if (ret == -ENODEV || ret == -ENODATA) {
449 /*
450 * When a battery is absent, we expect -ENODEV. Don't abort;
451 * send the uevent with at least the PRESENT=0 property
452 */
453 return 0;
454 }
455
456 if (ret < 0)
457 return ret;
458
459 line = strchr(prop_buf, '\n');
460 if (line)
461 *line = 0;
462
463 return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
464 pwr_attr->prop_name, prop_buf);
465 }
466
power_supply_uevent(const struct device * dev,struct kobj_uevent_env * env)467 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
468 {
469 const struct power_supply *psy = dev_get_drvdata(dev);
470 const enum power_supply_property *battery_props =
471 power_supply_battery_info_properties;
472 unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
473 sizeof(unsigned long) + 1] = {0};
474 int ret = 0, j;
475 char *prop_buf;
476
477 if (!psy || !psy->desc) {
478 dev_dbg(dev, "No power supply yet\n");
479 return ret;
480 }
481
482 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
483 if (ret)
484 return ret;
485
486 /*
487 * Kernel generates KOBJ_REMOVE uevent in device removal path, after
488 * resources have been freed. Exit early to avoid use-after-free.
489 */
490 if (psy->removing)
491 return 0;
492
493 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
494 if (!prop_buf)
495 return -ENOMEM;
496
497 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
498 if (ret)
499 goto out;
500
501 for (j = 0; j < psy->desc->num_properties; j++) {
502 set_bit(psy->desc->properties[j], psy_drv_properties);
503 ret = add_prop_uevent(dev, env, psy->desc->properties[j],
504 prop_buf);
505 if (ret)
506 goto out;
507 }
508
509 for (j = 0; j < power_supply_battery_info_properties_size; j++) {
510 if (test_bit(battery_props[j], psy_drv_properties))
511 continue;
512 if (!power_supply_battery_info_has_prop(psy->battery_info,
513 battery_props[j]))
514 continue;
515 ret = add_prop_uevent(dev, env, battery_props[j],
516 prop_buf);
517 if (ret)
518 goto out;
519 }
520
521 out:
522 free_page((unsigned long)prop_buf);
523
524 return ret;
525 }
526
power_supply_charge_behaviour_show(struct device * dev,unsigned int available_behaviours,enum power_supply_charge_behaviour current_behaviour,char * buf)527 ssize_t power_supply_charge_behaviour_show(struct device *dev,
528 unsigned int available_behaviours,
529 enum power_supply_charge_behaviour current_behaviour,
530 char *buf)
531 {
532 bool match = false, available, active;
533 ssize_t count = 0;
534 int i;
535
536 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
537 available = available_behaviours & BIT(i);
538 active = i == current_behaviour;
539
540 if (available && active) {
541 count += sysfs_emit_at(buf, count, "[%s] ",
542 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
543 match = true;
544 } else if (available) {
545 count += sysfs_emit_at(buf, count, "%s ",
546 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
547 }
548 }
549
550 if (!match) {
551 dev_warn(dev, "driver reporting unsupported charge behaviour\n");
552 return -EINVAL;
553 }
554
555 if (count)
556 buf[count - 1] = '\n';
557
558 return count;
559 }
560 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
561
power_supply_charge_behaviour_parse(unsigned int available_behaviours,const char * buf)562 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
563 {
564 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
565
566 if (i < 0)
567 return i;
568
569 if (available_behaviours & BIT(i))
570 return i;
571
572 return -EINVAL;
573 }
574 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);
575