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 /* Properties of type `const char *' */ 227 POWER_SUPPLY_ATTR(MODEL_NAME), 228 POWER_SUPPLY_ATTR(MANUFACTURER), 229 POWER_SUPPLY_ATTR(SERIAL_NUMBER), 230 }; 231 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) 232 233 static struct attribute * 234 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1] __ro_after_init; 235 236 static const struct power_supply_attr *to_ps_attr(struct device_attribute *attr) 237 { 238 return container_of(attr, struct power_supply_attr, dev_attr); 239 } 240 241 static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 242 { 243 return to_ps_attr(attr) - power_supply_attrs; 244 } 245 246 static void power_supply_escape_spaces(const char *str, char *buf, size_t bufsize) 247 { 248 strscpy(buf, str, bufsize); 249 strreplace(buf, ' ', '_'); 250 } 251 252 static int power_supply_match_string(const char * const *array, size_t n, const char *s) 253 { 254 int ret; 255 256 /* First try an exact match */ 257 ret = __sysfs_match_string(array, n, s); 258 if (ret >= 0) 259 return ret; 260 261 /* Second round, try matching with spaces replaced by '_' */ 262 for (size_t i = 0; i < n; i++) { 263 char buf[32]; 264 265 power_supply_escape_spaces(array[i], buf, sizeof(buf)); 266 if (sysfs_streq(buf, s)) 267 return i; 268 } 269 270 return -EINVAL; 271 } 272 273 static ssize_t power_supply_show_enum_with_available( 274 struct device *dev, const char * const labels[], int label_count, 275 unsigned int available_values, int value, char *buf) 276 { 277 bool match = false, available, active; 278 char escaped_label[32]; 279 ssize_t count = 0; 280 int i; 281 282 for (i = 0; i < label_count; i++) { 283 available = available_values & BIT(i); 284 active = i == value; 285 power_supply_escape_spaces(labels[i], escaped_label, sizeof(escaped_label)); 286 287 if (available && active) { 288 count += sysfs_emit_at(buf, count, "[%s] ", escaped_label); 289 match = true; 290 } else if (available) { 291 count += sysfs_emit_at(buf, count, "%s ", escaped_label); 292 } 293 } 294 295 if (!match) { 296 dev_warn(dev, "driver reporting unavailable enum value %d\n", value); 297 return -EINVAL; 298 } 299 300 if (count) 301 buf[count - 1] = '\n'; 302 303 return count; 304 } 305 306 static ssize_t power_supply_show_charge_behaviour(struct device *dev, 307 struct power_supply *psy, 308 union power_supply_propval *value, 309 char *buf) 310 { 311 struct power_supply_ext_registration *reg; 312 313 scoped_guard(rwsem_read, &psy->extensions_sem) { 314 power_supply_for_each_extension(reg, psy) { 315 if (power_supply_ext_has_property(reg->ext, 316 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR)) 317 return power_supply_charge_behaviour_show(dev, 318 reg->ext->charge_behaviours, 319 value->intval, buf); 320 } 321 } 322 323 return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours, 324 value->intval, buf); 325 } 326 327 static ssize_t power_supply_show_charge_types(struct device *dev, 328 struct power_supply *psy, 329 enum power_supply_charge_type current_type, 330 char *buf) 331 { 332 struct power_supply_ext_registration *reg; 333 334 scoped_guard(rwsem_read, &psy->extensions_sem) { 335 power_supply_for_each_extension(reg, psy) { 336 if (power_supply_ext_has_property(reg->ext, 337 POWER_SUPPLY_PROP_CHARGE_TYPES)) 338 return power_supply_charge_types_show(dev, 339 reg->ext->charge_types, 340 current_type, buf); 341 } 342 } 343 344 return power_supply_charge_types_show(dev, psy->desc->charge_types, 345 current_type, buf); 346 } 347 348 static ssize_t power_supply_format_property(struct device *dev, 349 bool uevent, 350 struct device_attribute *attr, 351 char *buf) 352 { 353 ssize_t ret; 354 struct power_supply *psy = dev_to_psy(dev); 355 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 356 enum power_supply_property psp = dev_attr_psp(attr); 357 union power_supply_propval value; 358 359 if (psp == POWER_SUPPLY_PROP_TYPE) { 360 value.intval = psy->desc->type; 361 } else { 362 ret = power_supply_get_property(psy, psp, &value); 363 364 if (ret < 0) { 365 if (ret == -ENODATA) 366 dev_dbg_ratelimited(dev, 367 "driver has no data for `%s' property\n", 368 attr->attr.name); 369 else if (ret != -ENODEV && ret != -EAGAIN && ret != -EINVAL) 370 dev_err_ratelimited(dev, 371 "driver failed to report `%s' property: %zd\n", 372 attr->attr.name, ret); 373 return ret; 374 } 375 } 376 377 switch (psp) { 378 case POWER_SUPPLY_PROP_USB_TYPE: 379 ret = power_supply_show_enum_with_available( 380 dev, POWER_SUPPLY_USB_TYPE_TEXT, 381 ARRAY_SIZE(POWER_SUPPLY_USB_TYPE_TEXT), 382 psy->desc->usb_types, value.intval, buf); 383 break; 384 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: 385 if (uevent) /* no possible values in uevents */ 386 goto default_format; 387 ret = power_supply_show_charge_behaviour(dev, psy, &value, buf); 388 break; 389 case POWER_SUPPLY_PROP_CHARGE_TYPES: 390 if (uevent) /* no possible values in uevents */ 391 goto default_format; 392 ret = power_supply_show_charge_types(dev, psy, 393 value.intval, buf); 394 break; 395 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 396 ret = sysfs_emit(buf, "%s\n", value.strval); 397 break; 398 default: 399 default_format: 400 if (ps_attr->text_values_len > 0 && 401 value.intval < ps_attr->text_values_len && value.intval >= 0) { 402 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 403 } else { 404 ret = sysfs_emit(buf, "%d\n", value.intval); 405 } 406 } 407 408 return ret; 409 } 410 411 static ssize_t power_supply_show_property(struct device *dev, 412 struct device_attribute *attr, 413 char *buf) 414 { 415 return power_supply_format_property(dev, false, attr, buf); 416 } 417 418 static ssize_t power_supply_store_property(struct device *dev, 419 struct device_attribute *attr, 420 const char *buf, size_t count) { 421 ssize_t ret; 422 struct power_supply *psy = dev_to_psy(dev); 423 const struct power_supply_attr *ps_attr = to_ps_attr(attr); 424 enum power_supply_property psp = dev_attr_psp(attr); 425 union power_supply_propval value; 426 427 ret = -EINVAL; 428 if (ps_attr->text_values_len > 0) { 429 ret = power_supply_match_string(ps_attr->text_values, 430 ps_attr->text_values_len, buf); 431 } 432 433 /* 434 * If no match was found, then check to see if it is an integer. 435 * Integer values are valid for enums in addition to the text value. 436 */ 437 if (ret < 0) { 438 long long_val; 439 440 ret = kstrtol(buf, 10, &long_val); 441 if (ret < 0) 442 return ret; 443 444 ret = long_val; 445 } 446 447 value.intval = ret; 448 449 ret = power_supply_set_property(psy, psp, &value); 450 if (ret < 0) 451 return ret; 452 453 return count; 454 } 455 456 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 457 struct attribute *attr, 458 int attrno) 459 { 460 struct device *dev = kobj_to_dev(kobj); 461 struct power_supply *psy = dev_to_psy(dev); 462 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 463 464 if (!power_supply_attrs[attrno].prop_name) 465 return 0; 466 467 if (attrno == POWER_SUPPLY_PROP_TYPE) 468 return mode; 469 470 guard(rwsem_read)(&psy->extensions_sem); 471 472 if (power_supply_has_property(psy, attrno)) { 473 if (power_supply_property_is_writeable(psy, attrno) > 0) 474 mode |= S_IWUSR; 475 return mode; 476 } 477 478 return 0; 479 } 480 481 static const struct attribute_group power_supply_attr_group = { 482 .attrs = __power_supply_attrs, 483 .is_visible = power_supply_attr_is_visible, 484 }; 485 486 static struct attribute *power_supply_extension_attrs[] = { 487 NULL 488 }; 489 490 static const struct attribute_group power_supply_extension_group = { 491 .name = "extensions", 492 .attrs = power_supply_extension_attrs, 493 }; 494 495 const struct attribute_group *power_supply_attr_groups[] = { 496 &power_supply_attr_group, 497 &power_supply_extension_group, 498 NULL 499 }; 500 501 void __init power_supply_init_attrs(void) 502 { 503 int i; 504 505 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 506 struct device_attribute *attr; 507 508 if (!power_supply_attrs[i].prop_name) { 509 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 510 __func__, i); 511 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 512 } else { 513 string_lower(power_supply_attrs[i].attr_name, 514 power_supply_attrs[i].attr_name); 515 } 516 517 attr = &power_supply_attrs[i].dev_attr; 518 519 attr->attr.name = power_supply_attrs[i].attr_name; 520 attr->show = power_supply_show_property; 521 attr->store = power_supply_store_property; 522 __power_supply_attrs[i] = &attr->attr; 523 } 524 } 525 526 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 527 enum power_supply_property prop, char *prop_buf) 528 { 529 int ret = 0; 530 struct power_supply_attr *pwr_attr; 531 struct device_attribute *dev_attr; 532 char *line; 533 534 pwr_attr = &power_supply_attrs[prop]; 535 dev_attr = &pwr_attr->dev_attr; 536 537 ret = power_supply_format_property((struct device *)dev, true, dev_attr, prop_buf); 538 if (ret == -ENODEV || ret == -ENODATA || ret == -EINVAL) { 539 /* 540 * When a battery is absent, we expect -ENODEV. Don't abort; 541 * send the uevent with at least the PRESENT=0 property 542 */ 543 return 0; 544 } 545 546 if (ret < 0) 547 return ret; 548 549 line = strchr(prop_buf, '\n'); 550 if (line) 551 *line = 0; 552 553 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 554 pwr_attr->prop_name, prop_buf); 555 } 556 557 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 558 { 559 const struct power_supply *psy = dev_to_psy(dev); 560 int ret = 0, j; 561 char *prop_buf; 562 563 if (!psy || !psy->desc) { 564 dev_dbg(dev, "No power supply yet\n"); 565 return ret; 566 } 567 568 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 569 if (ret) 570 return ret; 571 572 /* 573 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 574 * resources have been freed. Exit early to avoid use-after-free. 575 */ 576 if (psy->removing) 577 return 0; 578 579 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 580 if (!prop_buf) 581 return -ENOMEM; 582 583 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 584 if (ret) 585 goto out; 586 587 for (j = 0; j < POWER_SUPPLY_ATTR_CNT; j++) { 588 ret = add_prop_uevent(dev, env, j, prop_buf); 589 if (ret) 590 goto out; 591 } 592 593 out: 594 free_page((unsigned long)prop_buf); 595 596 return ret; 597 } 598 599 ssize_t power_supply_charge_behaviour_show(struct device *dev, 600 unsigned int available_behaviours, 601 enum power_supply_charge_behaviour current_behaviour, 602 char *buf) 603 { 604 return power_supply_show_enum_with_available( 605 dev, POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, 606 ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT), 607 available_behaviours, current_behaviour, buf); 608 } 609 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 610 611 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 612 { 613 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 614 615 if (i < 0) 616 return i; 617 618 if (available_behaviours & BIT(i)) 619 return i; 620 621 return -EINVAL; 622 } 623 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 624 625 ssize_t power_supply_charge_types_show(struct device *dev, 626 unsigned int available_types, 627 enum power_supply_charge_type current_type, 628 char *buf) 629 { 630 return power_supply_show_enum_with_available( 631 dev, POWER_SUPPLY_CHARGE_TYPE_TEXT, 632 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 633 available_types, current_type, buf); 634 } 635 EXPORT_SYMBOL_GPL(power_supply_charge_types_show); 636 637 int power_supply_charge_types_parse(unsigned int available_types, const char *buf) 638 { 639 int i = power_supply_match_string(POWER_SUPPLY_CHARGE_TYPE_TEXT, 640 ARRAY_SIZE(POWER_SUPPLY_CHARGE_TYPE_TEXT), 641 buf); 642 643 if (i < 0) 644 return i; 645 646 if (available_types & BIT(i)) 647 return i; 648 649 return -EINVAL; 650 } 651 EXPORT_SYMBOL_GPL(power_supply_charge_types_parse); 652 653 int power_supply_sysfs_add_extension(struct power_supply *psy, const struct power_supply_ext *ext, 654 struct device *dev) 655 { 656 return sysfs_add_link_to_group(&psy->dev.kobj, power_supply_extension_group.name, 657 &dev->kobj, ext->name); 658 } 659 660 void power_supply_sysfs_remove_extension(struct power_supply *psy, 661 const struct power_supply_ext *ext) 662 { 663 sysfs_remove_link_from_group(&psy->dev.kobj, power_supply_extension_group.name, ext->name); 664 } 665