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