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 24 struct 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 "\0", \ 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 47 static 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 63 static 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 76 static 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 84 static 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 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_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 }; 114 115 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = { 116 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown", 117 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH", 118 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion", 119 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly", 120 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe", 121 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd", 122 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn", 123 }; 124 125 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = { 126 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown", 127 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical", 128 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low", 129 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal", 130 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High", 131 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full", 132 }; 133 134 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { 135 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown", 136 [POWER_SUPPLY_SCOPE_SYSTEM] = "System", 137 [POWER_SUPPLY_SCOPE_DEVICE] = "Device", 138 }; 139 140 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = { 141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto", 142 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge", 143 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE_AWAKE] = "inhibit-charge-awake", 144 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge", 145 }; 146 147 static struct power_supply_attr power_supply_attrs[] __ro_after_init = { 148 /* Properties of type `int' */ 149 POWER_SUPPLY_ENUM_ATTR(STATUS), 150 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE), 151 POWER_SUPPLY_ENUM_ATTR(HEALTH), 152 POWER_SUPPLY_ATTR(PRESENT), 153 POWER_SUPPLY_ATTR(ONLINE), 154 POWER_SUPPLY_ATTR(AUTHENTIC), 155 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY), 156 POWER_SUPPLY_ATTR(CYCLE_COUNT), 157 POWER_SUPPLY_ATTR(VOLTAGE_MAX), 158 POWER_SUPPLY_ATTR(VOLTAGE_MIN), 159 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN), 160 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN), 161 POWER_SUPPLY_ATTR(VOLTAGE_NOW), 162 POWER_SUPPLY_ATTR(VOLTAGE_AVG), 163 POWER_SUPPLY_ATTR(VOLTAGE_OCV), 164 POWER_SUPPLY_ATTR(VOLTAGE_BOOT), 165 POWER_SUPPLY_ATTR(CURRENT_MAX), 166 POWER_SUPPLY_ATTR(CURRENT_NOW), 167 POWER_SUPPLY_ATTR(CURRENT_AVG), 168 POWER_SUPPLY_ATTR(CURRENT_BOOT), 169 POWER_SUPPLY_ATTR(POWER_NOW), 170 POWER_SUPPLY_ATTR(POWER_AVG), 171 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN), 172 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN), 173 POWER_SUPPLY_ATTR(CHARGE_FULL), 174 POWER_SUPPLY_ATTR(CHARGE_EMPTY), 175 POWER_SUPPLY_ATTR(CHARGE_NOW), 176 POWER_SUPPLY_ATTR(CHARGE_AVG), 177 POWER_SUPPLY_ATTR(CHARGE_COUNTER), 178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT), 179 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX), 180 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE), 181 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX), 182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT), 183 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX), 184 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD), 185 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD), 186 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR), 187 /* Same enum value texts as "charge_type" without the 's' at the end */ 188 _POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPES, POWER_SUPPLY_CHARGE_TYPE_TEXT), 189 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT), 190 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT), 191 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT), 192 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN), 193 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN), 194 POWER_SUPPLY_ATTR(ENERGY_FULL), 195 POWER_SUPPLY_ATTR(ENERGY_EMPTY), 196 POWER_SUPPLY_ATTR(ENERGY_NOW), 197 POWER_SUPPLY_ATTR(ENERGY_AVG), 198 POWER_SUPPLY_ATTR(CAPACITY), 199 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN), 200 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX), 201 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN), 202 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL), 203 POWER_SUPPLY_ATTR(TEMP), 204 POWER_SUPPLY_ATTR(TEMP_MAX), 205 POWER_SUPPLY_ATTR(TEMP_MIN), 206 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN), 207 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX), 208 POWER_SUPPLY_ATTR(TEMP_AMBIENT), 209 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN), 210 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX), 211 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW), 212 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG), 213 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW), 214 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG), 215 POWER_SUPPLY_ENUM_ATTR(TYPE), 216 POWER_SUPPLY_ENUM_ATTR(USB_TYPE), 217 POWER_SUPPLY_ENUM_ATTR(SCOPE), 218 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT), 219 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT), 220 POWER_SUPPLY_ATTR(CALIBRATE), 221 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR), 222 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH), 223 POWER_SUPPLY_ATTR(MANUFACTURE_DAY), 224 /* Properties of type `const char *' */ 225 POWER_SUPPLY_ATTR(MODEL_NAME), 226 POWER_SUPPLY_ATTR(MANUFACTURER), 227 POWER_SUPPLY_ATTR(SERIAL_NUMBER), 228 }; 229 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) 230 231 static struct attribute * 232 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init; 233 234 static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr) 235 { 236 return container_of(attr, struct power_supply_attr, dev_attr); 237 } 238 239 static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 240 { 241 return to_ps_attr(attr) - power_supply_attrs; 242 } 243 244 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize) 245 { 246 strscpy(buf, str, bufsize); 247 strreplace(buf, ' ', '_'); 248 } 249 250 static int power_supply_match_string(const char * const *array, size_t n, const char *s) 251 { 252 int ret; 253 254 /* First try an exact match */ 255 ret = __sysfs_match_string(array, n, s); 256 if (ret >= 0) 257 return ret; 258 259 /* Second round, try matching with spaces replaced by '_' */ 260 for (size_t i = 0; i < n; i++) { 261 char buf[32]; 262 263 power_supply_escape_spaces(array[i], buf, sizeof(buf)); 264 if (sysfs_streq(buf, s)) 265 return i; 266 } 267 268 return -EINVAL; 269 } 270 271 static ssize_t power_supply_show_enum_with_available( 272 struct device *dev, const char * const labels[], int label_count, 273 unsigned int available_values, int value, char *buf) 274 { 275 bool match = false, available, active; 276 char escaped_label[32]; 277 ssize_t count = 0; 278 int i; 279 280 for (i = 0; i < label_count; i++) { 281 available = available_values & BIT(i); 282 active = i == value; 283 power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label)); 284 285 if (available && active) { 286 count += sysfs_emit_at(buf, count, "[%s] ", escaped_label); 287 match = true; 288 } else if (available) { 289 count += sysfs_emit_at(buf, count, "%s ", escaped_label); 290 } 291 } 292 293 if (!match) { 294 dev_warn(dev, "driver reporting unavailable enum value %d\n", value); 295 return -EINVAL; 296 } 297 298 if (count) 299 buf[count - 1] = '\n'; 300 301 return count; 302 } 303 304 static ssize_t power_supply_show_charge_behaviour(struct device *dev, 305 struct power_supply *psy, 306 union power_supply_propval *value, 307 char *buf) 308 { 309 struct power_supply_ext_registration *reg; 310 311 scoped_guard(rwsem_read, &psy->extensions_sem) { 312 power_supply_for_each_extension(reg, psy) { 313 if (power_supply_ext_has_property(reg->ext, 314 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR)) 315 return power_supply_charge_behaviour_show(dev, 316 reg->ext->charge_behaviours, 317 value->intval, buf); 318 } 319 } 320 321 return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours, 322 value->intval, buf); 323 } 324 325 static ssize_t power_supply_format_property(struct device *dev, 326 bool uevent, 327 struct device_attribute *attr, 328 char *buf) 329 { 330 ssize_t ret; 331 struct power_supply *psy = dev_to_psy(dev); 332 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 333 enum power_supply_property psp = dev_attr_psp(attr); 334 union power_supply_propval value; 335 336 if (psp == POWER_SUPPLY_PROP_TYPE) { 337 value.intval = psy->desc->type; 338 } else { 339 ret = power_supply_get_property(psy, psp, &value); 340 341 if (ret < 0) { 342 if (ret == -ENODATA) 343 dev_dbg_ratelimited(dev, 344 "driver has no data for `%s' property\n", 345 attr->attr.name); 346 else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL) 347 dev_err_ratelimited(dev, 348 "driver failed to report `%s' property: %zd\n", 349 attr->attr.name, ret); 350 return ret; 351 } 352 } 353 354 switch (psp) { 355 case POWER_SUPPLY_PROP_USB_TYPE: 356 ret = power_supply_show_enum_with_available( 357 dev, POWER_SUPPLY_USB_TYPE_TEXT, 358 ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT), 359 psy->desc->usb_types, value.intval, buf); 360 break; 361 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: 362 if (uevent) /* no possible values in uevents */ 363 goto default_format; 364 ret = power_supply_show_charge_behaviour(dev, psy, &value, buf); 365 break; 366 case POWER_SUPPLY_PROP_CHARGE_TYPES: 367 if (uevent) /* no possible values in uevents */ 368 goto default_format; 369 ret = power_supply_charge_types_show(dev, psy->desc->charge_types, 370 value.intval, buf); 371 break; 372 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 373 ret = sysfs_emit(buf, "%s\n", value.strval); 374 break; 375 default: 376 default_format: 377 if (ps_attr->text_values_len > 0 && 378 value.intval < ps_attr->text_values_len && value.intval >= 0) { 379 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 380 } else { 381 ret = sysfs_emit(buf, "%d\n", value.intval); 382 } 383 } 384 385 return ret; 386 } 387 388 static ssize_t power_supply_show_property(struct device *dev, 389 struct device_attribute *attr, 390 char *buf) 391 { 392 return power_supply_format_property(dev, false, attr, buf); 393 } 394 395 static ssize_t power_supply_store_property(struct device *dev, 396 struct device_attribute *attr, 397 const char *buf, size_t count) { 398 ssize_t ret; 399 struct power_supply *psy = dev_to_psy(dev); 400 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 401 enum power_supply_property psp = dev_attr_psp(attr); 402 union power_supply_propval value; 403 404 ret = -EINVAL; 405 if (ps_attr->text_values_len > 0) { 406 ret = power_supply_match_string(ps_attr->text_values, 407 ps_attr->text_values_len, buf); 408 } 409 410 /* 411 * If no match was found, then check to see if it is an integer. 412 * Integer values are valid for enums in addition to the text value. 413 */ 414 if (ret < 0) { 415 long long_val; 416 417 ret = kstrtol(buf, 10, &long_val); 418 if (ret < 0) 419 return ret; 420 421 ret = long_val; 422 } 423 424 value.intval = ret; 425 426 ret = power_supply_set_property(psy, psp, &value); 427 if (ret < 0) 428 return ret; 429 430 return count; 431 } 432 433 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 434 struct attribute *attr, 435 int attrno) 436 { 437 struct device *dev = kobj_to_dev(kobj); 438 struct power_supply *psy = dev_to_psy(dev); 439 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 440 441 if (!power_supply_attrs[attrno].prop_name) 442 return 0; 443 444 if (attrno == POWER_SUPPLY_PROP_TYPE) 445 return mode; 446 447 guard(rwsem_read)(&psy->extensions_sem); 448 449 if (power_supply_has_property(psy, attrno)) { 450 if (power_supply_property_is_writeable(psy, attrno) > 0) 451 mode |= S_IWUSR; 452 return mode; 453 } 454 455 return 0; 456 } 457 458 static const struct attribute_group power_supply_attr_group = { 459 .attrs = __power_supply_attrs, 460 .is_visible = power_supply_attr_is_visible, 461 }; 462 463 static struct attribute *power_supply_extension_attrs[] = { 464 NULL 465 }; 466 467 static const struct attribute_group power_supply_extension_group = { 468 .name = "extensions", 469 .attrs = power_supply_extension_attrs, 470 }; 471 472 const struct attribute_group *power_supply_attr_groups[] = { 473 &power_supply_attr_group, 474 &power_supply_extension_group, 475 NULL 476 }; 477 478 void __init power_supply_init_attrs(void) 479 { 480 int i; 481 482 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 483 struct device_attribute *attr; 484 485 if (!power_supply_attrs[i].prop_name) { 486 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 487 __func__, i); 488 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 489 } else { 490 string_lower(power_supply_attrs[i].attr_name, 491 power_supply_attrs[i].attr_name); 492 } 493 494 attr = &power_supply_attrs[i].dev_attr; 495 496 attr->attr.name = power_supply_attrs[i].attr_name; 497 attr->show = power_supply_show_property; 498 attr->store = power_supply_store_property; 499 __power_supply_attrs[i] = &attr->attr; 500 } 501 } 502 503 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 504 enum power_supply_property prop, char *prop_buf) 505 { 506 int ret = 0; 507 struct power_supply_attr *pwr_attr; 508 struct device_attribute *dev_attr; 509 char *line; 510 511 pwr_attr = &power_supply_attrs[prop]; 512 dev_attr = &pwr_attr->dev_attr; 513 514 ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf); 515 if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) { 516 /* 517 * When a battery is absent, we expect -ENODEV. Don't abort; 518 * send the uevent with at least the PRESENT=0 property 519 */ 520 return 0; 521 } 522 523 if (ret < 0) 524 return ret; 525 526 line = strchr(prop_buf, '\n'); 527 if (line) 528 *line = 0; 529 530 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 531 pwr_attr->prop_name, prop_buf); 532 } 533 534 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 535 { 536 const struct power_supply *psy = dev_to_psy(dev); 537 int ret = 0, j; 538 char *prop_buf; 539 540 if (!psy || !psy->desc) { 541 dev_dbg(dev, "No power supply yet\n"); 542 return ret; 543 } 544 545 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 546 if (ret) 547 return ret; 548 549 /* 550 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 551 * resources have been freed. Exit early to avoid use-after-free. 552 */ 553 if (psy->removing) 554 return 0; 555 556 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 557 if (!prop_buf) 558 return -ENOMEM; 559 560 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 561 if (ret) 562 goto out; 563 564 for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) { 565 ret = add_prop_uevent(dev, env, j, prop_buf); 566 if (ret) 567 goto out; 568 } 569 570 out: 571 free_page((unsigned long)prop_buf); 572 573 return ret; 574 } 575 576 ssize_t power_supply_charge_behaviour_show(struct device *dev, 577 unsigned int available_behaviours, 578 enum power_supply_charge_behaviour current_behaviour, 579 char *buf) 580 { 581 return power_supply_show_enum_with_available( 582 dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, 583 ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT), 584 available_behaviours, current_behaviour, buf); 585 } 586 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 587 588 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 589 { 590 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 591 592 if (i < 0) 593 return i; 594 595 if (available_behaviours & BIT(i)) 596 return i; 597 598 return -EINVAL; 599 } 600 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 601 602 ssize_t power_supply_charge_types_show(struct device *dev, 603 unsigned int available_types, 604 enum power_supply_charge_type current_type, 605 char *buf) 606 { 607 return power_supply_show_enum_with_available( 608 dev, POWER_SUPPLY_CHARGE_TYPE_TEXT, 609 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 610 available_types, current_type, buf); 611 } 612 EXPORT_SYMBOL_GPL(power_supply_charge_types_show); 613 614 int power_supply_charge_types_parse(unsigned int available_types, const char *buf) 615 { 616 int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT, 617 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 618 buf); 619 620 if (i < 0) 621 return i; 622 623 if (available_types & BIT(i)) 624 return i; 625 626 return -EINVAL; 627 } 628 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse); 629 630 int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext, 631 struct device *dev) 632 { 633 return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name, 634 &dev->kobj, ext->name); 635 } 636 637 void power_supply_sysfs_remove_extension(struct power_supply *psy, 638 const struct power_supply_ext *ext) 639 { 640 sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name); 641 } 642