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, \ 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 [POWER_SUPPLY_HEALTH_BLOWN_FUSE] = "Blown fuse", 114 [POWER_SUPPLY_HEALTH_CELL_IMBALANCE] = "Cell imbalance", 115 }; 116 117 static 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 }; 126 127 static 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 }; 135 136 static 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 }; 141 142 static 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 }; 148 149 static 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) 234 235 static struct attribute * 236 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init; 237 238 static 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 } 242 243 static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 244 { 245 return to_ps_attr(attr) - power_supply_attrs; 246 } 247 248 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize) 249 { 250 strscpy(buf, str, bufsize); 251 strreplace(buf, ' ', '_'); 252 } 253 254 static 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 } 274 275 static 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 } 307 308 static 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 } 328 329 static 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 } 349 350 static 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: 401 default_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 } 412 413 static 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 } 419 420 static 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 } 457 458 static 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 } 482 483 static const struct attribute_group power_supply_attr_group = { 484 .attrs = __power_supply_attrs, 485 .is_visible = power_supply_attr_is_visible, 486 }; 487 488 static struct attribute *power_supply_extension_attrs[] = { 489 NULL 490 }; 491 492 static const struct attribute_group power_supply_extension_group = { 493 .name = "extensions", 494 .attrs = power_supply_extension_attrs, 495 }; 496 497 const struct attribute_group *power_supply_attr_groups[] = { 498 &power_supply_attr_group, 499 &power_supply_extension_group, 500 NULL 501 }; 502 503 void __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 } 527 528 static 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 } 558 559 int 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 } 594 595 out: 596 free_page((unsigned long)prop_buf); 597 598 return ret; 599 } 600 601 ssize_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 } 611 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 612 613 int 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 } 625 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 626 627 ssize_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 } 637 EXPORT_SYMBOL_GPL(power_supply_charge_types_show); 638 639 int 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 } 653 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse); 654 655 int 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 } 661 662 void 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 } 667