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_PD_SPR_AVS] = "PD_SPR_AVS", 74 [POWER_SUPPLY_USB_TYPE_PD_PPS_SPR_AVS] = "PD_PPS_SPR_AVS", 75 [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID", 76 }; 77 78 static const char * const POWER_SUPPLY_STATUS_TEXT[] = { 79 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown", 80 [POWER_SUPPLY_STATUS_CHARGING] = "Charging", 81 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging", 82 [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging", 83 [POWER_SUPPLY_STATUS_FULL] = "Full", 84 }; 85 86 static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = { 87 [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown", 88 [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A", 89 [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle", 90 [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast", 91 [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard", 92 [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive", 93 [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom", 94 [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life", 95 [POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass", 96 }; 97 98 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = { 99 [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown", 100 [POWER_SUPPLY_HEALTH_GOOD] = "Good", 101 [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat", 102 [POWER_SUPPLY_HEALTH_DEAD] = "Dead", 103 [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage", 104 [POWER_SUPPLY_HEALTH_UNDERVOLTAGE] = "Under voltage", 105 [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure", 106 [POWER_SUPPLY_HEALTH_COLD] = "Cold", 107 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire", 108 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire", 109 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current", 110 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required", 111 [POWER_SUPPLY_HEALTH_WARM] = "Warm", 112 [POWER_SUPPLY_HEALTH_COOL] = "Cool", 113 [POWER_SUPPLY_HEALTH_HOT] = "Hot", 114 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery", 115 [POWER_SUPPLY_HEALTH_BLOWN_FUSE] = "Blown fuse", 116 [POWER_SUPPLY_HEALTH_CELL_IMBALANCE] = "Cell imbalance", 117 }; 118 119 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = { 120 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown", 121 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH", 122 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion", 123 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly", 124 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe", 125 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd", 126 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn", 127 [POWER_SUPPLY_TECHNOLOGY_PbAc] = "PbAc", 128 [POWER_SUPPLY_TECHNOLOGY_NiZn] = "NiZn", 129 [POWER_SUPPLY_TECHNOLOGY_RAM] = "RAM", 130 [POWER_SUPPLY_TECHNOLOGY_ZnAr] = "ZnAr", 131 }; 132 133 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = { 134 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown", 135 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical", 136 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low", 137 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal", 138 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High", 139 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full", 140 }; 141 142 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { 143 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown", 144 [POWER_SUPPLY_SCOPE_SYSTEM] = "System", 145 [POWER_SUPPLY_SCOPE_DEVICE] = "Device", 146 }; 147 148 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = { 149 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto", 150 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge", 151 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE_AWAKE] = "inhibit-charge-awake", 152 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge", 153 }; 154 155 static struct power_supply_attr power_supply_attrs[] __ro_after_init = { 156 /* Properties of type `int' */ 157 POWER_SUPPLY_ENUM_ATTR(STATUS), 158 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE), 159 POWER_SUPPLY_ENUM_ATTR(HEALTH), 160 POWER_SUPPLY_ATTR(PRESENT), 161 POWER_SUPPLY_ATTR(ONLINE), 162 POWER_SUPPLY_ATTR(AUTHENTIC), 163 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY), 164 POWER_SUPPLY_ATTR(CYCLE_COUNT), 165 POWER_SUPPLY_ATTR(VOLTAGE_MAX), 166 POWER_SUPPLY_ATTR(VOLTAGE_MIN), 167 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN), 168 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN), 169 POWER_SUPPLY_ATTR(VOLTAGE_NOW), 170 POWER_SUPPLY_ATTR(VOLTAGE_AVG), 171 POWER_SUPPLY_ATTR(VOLTAGE_OCV), 172 POWER_SUPPLY_ATTR(VOLTAGE_BOOT), 173 POWER_SUPPLY_ATTR(CURRENT_MAX), 174 POWER_SUPPLY_ATTR(CURRENT_NOW), 175 POWER_SUPPLY_ATTR(CURRENT_AVG), 176 POWER_SUPPLY_ATTR(CURRENT_BOOT), 177 POWER_SUPPLY_ATTR(POWER_NOW), 178 POWER_SUPPLY_ATTR(POWER_AVG), 179 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN), 180 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN), 181 POWER_SUPPLY_ATTR(CHARGE_FULL), 182 POWER_SUPPLY_ATTR(CHARGE_EMPTY), 183 POWER_SUPPLY_ATTR(CHARGE_NOW), 184 POWER_SUPPLY_ATTR(CHARGE_AVG), 185 POWER_SUPPLY_ATTR(CHARGE_COUNTER), 186 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT), 187 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX), 188 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE), 189 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX), 190 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT), 191 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX), 192 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD), 193 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD), 194 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR), 195 /* Same enum value texts as "charge_type" without the 's' at the end */ 196 _POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPES, POWER_SUPPLY_CHARGE_TYPE_TEXT), 197 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT), 198 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT), 199 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT), 200 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN), 201 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN), 202 POWER_SUPPLY_ATTR(ENERGY_FULL), 203 POWER_SUPPLY_ATTR(ENERGY_EMPTY), 204 POWER_SUPPLY_ATTR(ENERGY_NOW), 205 POWER_SUPPLY_ATTR(ENERGY_AVG), 206 POWER_SUPPLY_ATTR(CAPACITY), 207 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN), 208 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX), 209 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN), 210 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL), 211 POWER_SUPPLY_ATTR(TEMP), 212 POWER_SUPPLY_ATTR(TEMP_MAX), 213 POWER_SUPPLY_ATTR(TEMP_MIN), 214 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN), 215 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX), 216 POWER_SUPPLY_ATTR(TEMP_AMBIENT), 217 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN), 218 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX), 219 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW), 220 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG), 221 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW), 222 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG), 223 POWER_SUPPLY_ENUM_ATTR(TYPE), 224 POWER_SUPPLY_ENUM_ATTR(USB_TYPE), 225 POWER_SUPPLY_ENUM_ATTR(SCOPE), 226 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT), 227 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT), 228 POWER_SUPPLY_ATTR(CALIBRATE), 229 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR), 230 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH), 231 POWER_SUPPLY_ATTR(MANUFACTURE_DAY), 232 POWER_SUPPLY_ATTR(INTERNAL_RESISTANCE), 233 POWER_SUPPLY_ATTR(STATE_OF_HEALTH), 234 /* Properties of type `const char *' */ 235 POWER_SUPPLY_ATTR(MODEL_NAME), 236 POWER_SUPPLY_ATTR(MANUFACTURER), 237 POWER_SUPPLY_ATTR(SERIAL_NUMBER), 238 }; 239 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) 240 241 static struct attribute * 242 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init; 243 244 static const struct power_supply_attr *to_ps_attr(const struct device_attribute *attr) 245 { 246 return container_of_const(attr, struct power_supply_attr, dev_attr); 247 } 248 249 static enum power_supply_property dev_attr_psp(const struct device_attribute *attr) 250 { 251 return to_ps_attr(attr) - power_supply_attrs; 252 } 253 254 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize) 255 { 256 strscpy(buf, str, bufsize); 257 strreplace(buf, ' ', '_'); 258 } 259 260 static int power_supply_match_string(const char * const *array, size_t n, const char *s) 261 { 262 int ret; 263 264 /* First try an exact match */ 265 ret = __sysfs_match_string(array, n, s); 266 if (ret >= 0) 267 return ret; 268 269 /* Second round, try matching with spaces replaced by '_' */ 270 for (size_t i = 0; i < n; i++) { 271 char buf[32]; 272 273 power_supply_escape_spaces(array[i], buf, sizeof(buf)); 274 if (sysfs_streq(buf, s)) 275 return i; 276 } 277 278 return -EINVAL; 279 } 280 281 static ssize_t power_supply_show_enum_with_available( 282 struct device *dev, const char * const labels[], int label_count, 283 unsigned int available_values, int value, char *buf) 284 { 285 bool match = false, available, active; 286 char escaped_label[32]; 287 ssize_t count = 0; 288 int i; 289 290 for (i = 0; i < label_count; i++) { 291 available = available_values & BIT(i); 292 active = i == value; 293 power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label)); 294 295 if (available && active) { 296 count += sysfs_emit_at(buf, count, "[%s] ", escaped_label); 297 match = true; 298 } else if (available) { 299 count += sysfs_emit_at(buf, count, "%s ", escaped_label); 300 } 301 } 302 303 if (!match) { 304 dev_warn(dev, "driver reporting unavailable enum value %d\n", value); 305 return -EINVAL; 306 } 307 308 if (count) 309 buf[count - 1] = '\n'; 310 311 return count; 312 } 313 314 static ssize_t power_supply_show_charge_behaviour(struct device *dev, 315 struct power_supply *psy, 316 union power_supply_propval *value, 317 char *buf) 318 { 319 struct power_supply_ext_registration *reg; 320 321 scoped_guard(rwsem_read, &psy->extensions_sem) { 322 power_supply_for_each_extension(reg, psy) { 323 if (power_supply_ext_has_property(reg->ext, 324 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR)) 325 return power_supply_charge_behaviour_show(dev, 326 reg->ext->charge_behaviours, 327 value->intval, buf); 328 } 329 } 330 331 return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours, 332 value->intval, buf); 333 } 334 335 static ssize_t power_supply_show_charge_types(struct device *dev, 336 struct power_supply *psy, 337 enum power_supply_charge_type current_type, 338 char *buf) 339 { 340 struct power_supply_ext_registration *reg; 341 342 scoped_guard(rwsem_read, &psy->extensions_sem) { 343 power_supply_for_each_extension(reg, psy) { 344 if (power_supply_ext_has_property(reg->ext, 345 POWER_SUPPLY_PROP_CHARGE_TYPES)) 346 return power_supply_charge_types_show(dev, 347 reg->ext->charge_types, 348 current_type, buf); 349 } 350 } 351 352 return power_supply_charge_types_show(dev, psy->desc->charge_types, 353 current_type, buf); 354 } 355 356 static ssize_t power_supply_format_property(struct device *dev, 357 bool uevent, 358 struct device_attribute *attr, 359 char *buf) 360 { 361 ssize_t ret; 362 struct power_supply *psy = dev_to_psy(dev); 363 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 364 enum power_supply_property psp = dev_attr_psp(attr); 365 union power_supply_propval value; 366 367 if (psp == POWER_SUPPLY_PROP_TYPE) { 368 value.intval = psy->desc->type; 369 } else { 370 ret = power_supply_get_property(psy, psp, &value); 371 372 if (ret < 0) { 373 if (ret == -ENODATA) 374 dev_dbg_ratelimited(dev, 375 "driver has no data for `%s' property\n", 376 attr->attr.name); 377 else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL) 378 dev_err_ratelimited(dev, 379 "driver failed to report `%s' property: %zd\n", 380 attr->attr.name, ret); 381 return ret; 382 } 383 } 384 385 switch (psp) { 386 case POWER_SUPPLY_PROP_USB_TYPE: 387 ret = power_supply_show_enum_with_available( 388 dev, POWER_SUPPLY_USB_TYPE_TEXT, 389 ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT), 390 psy->desc->usb_types, value.intval, buf); 391 break; 392 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: 393 if (uevent) /* no possible values in uevents */ 394 goto default_format; 395 ret = power_supply_show_charge_behaviour(dev, psy, &value, buf); 396 break; 397 case POWER_SUPPLY_PROP_CHARGE_TYPES: 398 if (uevent) /* no possible values in uevents */ 399 goto default_format; 400 ret = power_supply_show_charge_types(dev, psy, 401 value.intval, buf); 402 break; 403 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 404 ret = sysfs_emit(buf, "%s\n", value.strval); 405 break; 406 default: 407 default_format: 408 if (ps_attr->text_values_len > 0 && 409 value.intval < ps_attr->text_values_len && value.intval >= 0) { 410 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 411 } else { 412 ret = sysfs_emit(buf, "%d\n", value.intval); 413 } 414 } 415 416 return ret; 417 } 418 419 static ssize_t power_supply_show_property(struct device *dev, 420 struct device_attribute *attr, 421 char *buf) 422 { 423 return power_supply_format_property(dev, false, attr, buf); 424 } 425 426 static ssize_t power_supply_store_property(struct device *dev, 427 struct device_attribute *attr, 428 const char *buf, size_t count) { 429 ssize_t ret; 430 struct power_supply *psy = dev_to_psy(dev); 431 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 432 enum power_supply_property psp = dev_attr_psp(attr); 433 union power_supply_propval value; 434 435 ret = -EINVAL; 436 if (ps_attr->text_values_len > 0) { 437 ret = power_supply_match_string(ps_attr->text_values, 438 ps_attr->text_values_len, buf); 439 } 440 441 /* 442 * If no match was found, then check to see if it is an integer. 443 * Integer values are valid for enums in addition to the text value. 444 */ 445 if (ret < 0) { 446 long long_val; 447 448 ret = kstrtol(buf, 10, &long_val); 449 if (ret < 0) 450 return ret; 451 452 ret = long_val; 453 } 454 455 value.intval = ret; 456 457 ret = power_supply_set_property(psy, psp, &value); 458 if (ret < 0) 459 return ret; 460 461 return count; 462 } 463 464 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 465 struct attribute *attr, 466 int attrno) 467 { 468 struct device *dev = kobj_to_dev(kobj); 469 struct power_supply *psy = dev_to_psy(dev); 470 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 471 472 if (!power_supply_attrs[attrno].prop_name) 473 return 0; 474 475 if (attrno == POWER_SUPPLY_PROP_TYPE) 476 return mode; 477 478 guard(rwsem_read)(&psy->extensions_sem); 479 480 if (power_supply_has_property(psy, attrno)) { 481 if (power_supply_property_is_writeable(psy, attrno) > 0) 482 mode |= S_IWUSR; 483 return mode; 484 } 485 486 return 0; 487 } 488 489 static const struct attribute_group power_supply_attr_group = { 490 .attrs = __power_supply_attrs, 491 .is_visible = power_supply_attr_is_visible, 492 }; 493 494 static struct attribute *power_supply_extension_attrs[] = { 495 NULL 496 }; 497 498 static const struct attribute_group power_supply_extension_group = { 499 .name = "extensions", 500 .attrs = power_supply_extension_attrs, 501 }; 502 503 const struct attribute_group *power_supply_attr_groups[] = { 504 &power_supply_attr_group, 505 &power_supply_extension_group, 506 NULL 507 }; 508 509 void __init power_supply_init_attrs(void) 510 { 511 int i; 512 513 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 514 struct device_attribute *attr; 515 516 if (!power_supply_attrs[i].prop_name) { 517 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 518 __func__, i); 519 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 520 } else { 521 string_lower(power_supply_attrs[i].attr_name, 522 power_supply_attrs[i].attr_name); 523 } 524 525 attr = &power_supply_attrs[i].dev_attr; 526 527 attr->attr.name = power_supply_attrs[i].attr_name; 528 attr->show = power_supply_show_property; 529 attr->store = power_supply_store_property; 530 __power_supply_attrs[i] = &attr->attr; 531 } 532 } 533 534 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 535 enum power_supply_property prop, char *prop_buf) 536 { 537 int ret = 0; 538 struct power_supply_attr *pwr_attr; 539 struct device_attribute *dev_attr; 540 char *line; 541 542 pwr_attr = &power_supply_attrs[prop]; 543 dev_attr = &pwr_attr->dev_attr; 544 545 ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf); 546 if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) { 547 /* 548 * When a battery is absent, we expect -ENODEV. Don't abort; 549 * send the uevent with at least the PRESENT=0 property 550 */ 551 return 0; 552 } 553 554 if (ret < 0) 555 return ret; 556 557 line = strchr(prop_buf, '\n'); 558 if (line) 559 *line = 0; 560 561 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 562 pwr_attr->prop_name, prop_buf); 563 } 564 565 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 566 { 567 const struct power_supply *psy = dev_to_psy(dev); 568 int ret = 0, j; 569 char *prop_buf; 570 571 if (!psy || !psy->desc) { 572 dev_dbg(dev, "No power supply yet\n"); 573 return ret; 574 } 575 576 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 577 if (ret) 578 return ret; 579 580 /* 581 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 582 * resources have been freed. Exit early to avoid use-after-free. 583 */ 584 if (psy->removing) 585 return 0; 586 587 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 588 if (!prop_buf) 589 return -ENOMEM; 590 591 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 592 if (ret) 593 goto out; 594 595 for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) { 596 ret = add_prop_uevent(dev, env, j, prop_buf); 597 if (ret) 598 goto out; 599 } 600 601 out: 602 free_page((unsigned long)prop_buf); 603 604 return ret; 605 } 606 607 ssize_t power_supply_charge_behaviour_show(struct device *dev, 608 unsigned int available_behaviours, 609 enum power_supply_charge_behaviour current_behaviour, 610 char *buf) 611 { 612 return power_supply_show_enum_with_available( 613 dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, 614 ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT), 615 available_behaviours, current_behaviour, buf); 616 } 617 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 618 619 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 620 { 621 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 622 623 if (i < 0) 624 return i; 625 626 if (available_behaviours & BIT(i)) 627 return i; 628 629 return -EINVAL; 630 } 631 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 632 633 ssize_t power_supply_charge_types_show(struct device *dev, 634 unsigned int available_types, 635 enum power_supply_charge_type current_type, 636 char *buf) 637 { 638 return power_supply_show_enum_with_available( 639 dev, POWER_SUPPLY_CHARGE_TYPE_TEXT, 640 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 641 available_types, current_type, buf); 642 } 643 EXPORT_SYMBOL_GPL(power_supply_charge_types_show); 644 645 int power_supply_charge_types_parse(unsigned int available_types, const char *buf) 646 { 647 int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT, 648 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 649 buf); 650 651 if (i < 0) 652 return i; 653 654 if (available_types & BIT(i)) 655 return i; 656 657 return -EINVAL; 658 } 659 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse); 660 661 int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext, 662 struct device *dev) 663 { 664 return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name, 665 &dev->kobj, ext->name); 666 } 667 668 void power_supply_sysfs_remove_extension(struct power_supply *psy, 669 const struct power_supply_ext *ext) 670 { 671 sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name); 672 } 673