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