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_UNSPEC_FAILURE] = "Unspecified failure", 103 [POWER_SUPPLY_HEALTH_COLD] = "Cold", 104 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire", 105 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire", 106 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current", 107 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required", 108 [POWER_SUPPLY_HEALTH_WARM] = "Warm", 109 [POWER_SUPPLY_HEALTH_COOL] = "Cool", 110 [POWER_SUPPLY_HEALTH_HOT] = "Hot", 111 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery", 112 }; 113 114 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = { 115 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown", 116 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH", 117 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion", 118 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly", 119 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe", 120 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd", 121 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn", 122 }; 123 124 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = { 125 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown", 126 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical", 127 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low", 128 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal", 129 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High", 130 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full", 131 }; 132 133 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { 134 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown", 135 [POWER_SUPPLY_SCOPE_SYSTEM] = "System", 136 [POWER_SUPPLY_SCOPE_DEVICE] = "Device", 137 }; 138 139 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = { 140 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto", 141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge", 142 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge", 143 }; 144 145 static struct power_supply_attr power_supply_attrs[] = { 146 /* Properties of type `int' */ 147 POWER_SUPPLY_ENUM_ATTR(STATUS), 148 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE), 149 POWER_SUPPLY_ENUM_ATTR(HEALTH), 150 POWER_SUPPLY_ATTR(PRESENT), 151 POWER_SUPPLY_ATTR(ONLINE), 152 POWER_SUPPLY_ATTR(AUTHENTIC), 153 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY), 154 POWER_SUPPLY_ATTR(CYCLE_COUNT), 155 POWER_SUPPLY_ATTR(VOLTAGE_MAX), 156 POWER_SUPPLY_ATTR(VOLTAGE_MIN), 157 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN), 158 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN), 159 POWER_SUPPLY_ATTR(VOLTAGE_NOW), 160 POWER_SUPPLY_ATTR(VOLTAGE_AVG), 161 POWER_SUPPLY_ATTR(VOLTAGE_OCV), 162 POWER_SUPPLY_ATTR(VOLTAGE_BOOT), 163 POWER_SUPPLY_ATTR(CURRENT_MAX), 164 POWER_SUPPLY_ATTR(CURRENT_NOW), 165 POWER_SUPPLY_ATTR(CURRENT_AVG), 166 POWER_SUPPLY_ATTR(CURRENT_BOOT), 167 POWER_SUPPLY_ATTR(POWER_NOW), 168 POWER_SUPPLY_ATTR(POWER_AVG), 169 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN), 170 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN), 171 POWER_SUPPLY_ATTR(CHARGE_FULL), 172 POWER_SUPPLY_ATTR(CHARGE_EMPTY), 173 POWER_SUPPLY_ATTR(CHARGE_NOW), 174 POWER_SUPPLY_ATTR(CHARGE_AVG), 175 POWER_SUPPLY_ATTR(CHARGE_COUNTER), 176 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT), 177 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX), 178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE), 179 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX), 180 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT), 181 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX), 182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD), 183 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD), 184 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR), 185 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT), 186 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT), 187 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT), 188 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN), 189 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN), 190 POWER_SUPPLY_ATTR(ENERGY_FULL), 191 POWER_SUPPLY_ATTR(ENERGY_EMPTY), 192 POWER_SUPPLY_ATTR(ENERGY_NOW), 193 POWER_SUPPLY_ATTR(ENERGY_AVG), 194 POWER_SUPPLY_ATTR(CAPACITY), 195 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN), 196 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX), 197 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN), 198 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL), 199 POWER_SUPPLY_ATTR(TEMP), 200 POWER_SUPPLY_ATTR(TEMP_MAX), 201 POWER_SUPPLY_ATTR(TEMP_MIN), 202 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN), 203 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX), 204 POWER_SUPPLY_ATTR(TEMP_AMBIENT), 205 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN), 206 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX), 207 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW), 208 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG), 209 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW), 210 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG), 211 POWER_SUPPLY_ENUM_ATTR(TYPE), 212 POWER_SUPPLY_ATTR(USB_TYPE), 213 POWER_SUPPLY_ENUM_ATTR(SCOPE), 214 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT), 215 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT), 216 POWER_SUPPLY_ATTR(CALIBRATE), 217 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR), 218 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH), 219 POWER_SUPPLY_ATTR(MANUFACTURE_DAY), 220 /* Properties of type `const char *' */ 221 POWER_SUPPLY_ATTR(MODEL_NAME), 222 POWER_SUPPLY_ATTR(MANUFACTURER), 223 POWER_SUPPLY_ATTR(SERIAL_NUMBER), 224 }; 225 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) 226 227 static struct attribute * 228 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1]; 229 230 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr) 231 { 232 return container_of(attr, struct power_supply_attr, dev_attr); 233 } 234 235 static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 236 { 237 return to_ps_attr(attr) - power_supply_attrs; 238 } 239 240 static ssize_t power_supply_show_usb_type(struct device *dev, 241 const struct power_supply_desc *desc, 242 union power_supply_propval *value, 243 char *buf) 244 { 245 enum power_supply_usb_type usb_type; 246 ssize_t count = 0; 247 bool match = false; 248 int i; 249 250 for (i = 0; i < desc->num_usb_types; ++i) { 251 usb_type = desc->usb_types[i]; 252 253 if (value->intval == usb_type) { 254 count += sysfs_emit_at(buf, count, "[%s] ", 255 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 256 match = true; 257 } else { 258 count += sysfs_emit_at(buf, count, "%s ", 259 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 260 } 261 } 262 263 if (!match) { 264 dev_warn(dev, "driver reporting unsupported connected type\n"); 265 return -EINVAL; 266 } 267 268 if (count) 269 buf[count - 1] = '\n'; 270 271 return count; 272 } 273 274 static ssize_t power_supply_show_property(struct device *dev, 275 struct device_attribute *attr, 276 char *buf) { 277 ssize_t ret; 278 struct power_supply *psy = dev_get_drvdata(dev); 279 struct power_supply_attr *ps_attr = to_ps_attr(attr); 280 enum power_supply_property psp = dev_attr_psp(attr); 281 union power_supply_propval value; 282 283 if (psp == POWER_SUPPLY_PROP_TYPE) { 284 value.intval = psy->desc->type; 285 } else { 286 ret = power_supply_get_property(psy, psp, &value); 287 288 if (ret < 0) { 289 if (ret == -ENODATA) 290 dev_dbg_ratelimited(dev, 291 "driver has no data for `%s' property\n", 292 attr->attr.name); 293 else if (ret != -ENODEV && ret != -EAGAIN) 294 dev_err_ratelimited(dev, 295 "driver failed to report `%s' property: %zd\n", 296 attr->attr.name, ret); 297 return ret; 298 } 299 } 300 301 if (ps_attr->text_values_len > 0 && 302 value.intval < ps_attr->text_values_len && value.intval >= 0) { 303 return sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 304 } 305 306 switch (psp) { 307 case POWER_SUPPLY_PROP_USB_TYPE: 308 ret = power_supply_show_usb_type(dev, psy->desc, 309 &value, buf); 310 break; 311 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 312 ret = sysfs_emit(buf, "%s\n", value.strval); 313 break; 314 default: 315 ret = sysfs_emit(buf, "%d\n", value.intval); 316 } 317 318 return ret; 319 } 320 321 static ssize_t power_supply_store_property(struct device *dev, 322 struct device_attribute *attr, 323 const char *buf, size_t count) { 324 ssize_t ret; 325 struct power_supply *psy = dev_get_drvdata(dev); 326 struct power_supply_attr *ps_attr = to_ps_attr(attr); 327 enum power_supply_property psp = dev_attr_psp(attr); 328 union power_supply_propval value; 329 330 ret = -EINVAL; 331 if (ps_attr->text_values_len > 0) { 332 ret = __sysfs_match_string(ps_attr->text_values, 333 ps_attr->text_values_len, buf); 334 } 335 336 /* 337 * If no match was found, then check to see if it is an integer. 338 * Integer values are valid for enums in addition to the text value. 339 */ 340 if (ret < 0) { 341 long long_val; 342 343 ret = kstrtol(buf, 10, &long_val); 344 if (ret < 0) 345 return ret; 346 347 ret = long_val; 348 } 349 350 value.intval = ret; 351 352 ret = power_supply_set_property(psy, psp, &value); 353 if (ret < 0) 354 return ret; 355 356 return count; 357 } 358 359 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 360 struct attribute *attr, 361 int attrno) 362 { 363 struct device *dev = kobj_to_dev(kobj); 364 struct power_supply *psy = dev_get_drvdata(dev); 365 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 366 int i; 367 368 if (!power_supply_attrs[attrno].prop_name) 369 return 0; 370 371 if (attrno == POWER_SUPPLY_PROP_TYPE) 372 return mode; 373 374 for (i = 0; i < psy->desc->num_properties; i++) { 375 int property = psy->desc->properties[i]; 376 377 if (property == attrno) { 378 if (psy->desc->property_is_writeable && 379 psy->desc->property_is_writeable(psy, property) > 0) 380 mode |= S_IWUSR; 381 382 return mode; 383 } 384 } 385 386 if (power_supply_battery_info_has_prop(psy->battery_info, attrno)) 387 return mode; 388 389 return 0; 390 } 391 392 static const struct attribute_group power_supply_attr_group = { 393 .attrs = __power_supply_attrs, 394 .is_visible = power_supply_attr_is_visible, 395 }; 396 397 static const struct attribute_group *power_supply_attr_groups[] = { 398 &power_supply_attr_group, 399 NULL, 400 }; 401 402 void power_supply_init_attrs(struct device_type *dev_type) 403 { 404 int i; 405 406 dev_type->groups = power_supply_attr_groups; 407 408 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 409 struct device_attribute *attr; 410 411 if (!power_supply_attrs[i].prop_name) { 412 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 413 __func__, i); 414 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 415 } else { 416 string_lower(power_supply_attrs[i].attr_name, 417 power_supply_attrs[i].attr_name); 418 } 419 420 attr = &power_supply_attrs[i].dev_attr; 421 422 attr->attr.name = power_supply_attrs[i].attr_name; 423 attr->show = power_supply_show_property; 424 attr->store = power_supply_store_property; 425 __power_supply_attrs[i] = &attr->attr; 426 } 427 } 428 429 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 430 enum power_supply_property prop, char *prop_buf) 431 { 432 int ret = 0; 433 struct power_supply_attr *pwr_attr; 434 struct device_attribute *dev_attr; 435 char *line; 436 437 pwr_attr = &power_supply_attrs[prop]; 438 dev_attr = &pwr_attr->dev_attr; 439 440 ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf); 441 if (ret == -ENODEV || ret == -ENODATA) { 442 /* 443 * When a battery is absent, we expect -ENODEV. Don't abort; 444 * send the uevent with at least the PRESENT=0 property 445 */ 446 return 0; 447 } 448 449 if (ret < 0) 450 return ret; 451 452 line = strchr(prop_buf, '\n'); 453 if (line) 454 *line = 0; 455 456 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 457 pwr_attr->prop_name, prop_buf); 458 } 459 460 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 461 { 462 const struct power_supply *psy = dev_get_drvdata(dev); 463 const enum power_supply_property *battery_props = 464 power_supply_battery_info_properties; 465 unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT / 466 sizeof(unsigned long) + 1] = {0}; 467 int ret = 0, j; 468 char *prop_buf; 469 470 if (!psy || !psy->desc) { 471 dev_dbg(dev, "No power supply yet\n"); 472 return ret; 473 } 474 475 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 476 if (ret) 477 return ret; 478 479 /* 480 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 481 * resources have been freed. Exit early to avoid use-after-free. 482 */ 483 if (psy->removing) 484 return 0; 485 486 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 487 if (!prop_buf) 488 return -ENOMEM; 489 490 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 491 if (ret) 492 goto out; 493 494 for (j = 0; j < psy->desc->num_properties; j++) { 495 set_bit(psy->desc->properties[j], psy_drv_properties); 496 ret = add_prop_uevent(dev, env, psy->desc->properties[j], 497 prop_buf); 498 if (ret) 499 goto out; 500 } 501 502 for (j = 0; j < power_supply_battery_info_properties_size; j++) { 503 if (test_bit(battery_props[j], psy_drv_properties)) 504 continue; 505 if (!power_supply_battery_info_has_prop(psy->battery_info, 506 battery_props[j])) 507 continue; 508 ret = add_prop_uevent(dev, env, battery_props[j], 509 prop_buf); 510 if (ret) 511 goto out; 512 } 513 514 out: 515 free_page((unsigned long)prop_buf); 516 517 return ret; 518 } 519 520 ssize_t power_supply_charge_behaviour_show(struct device *dev, 521 unsigned int available_behaviours, 522 enum power_supply_charge_behaviour current_behaviour, 523 char *buf) 524 { 525 bool match = false, available, active; 526 ssize_t count = 0; 527 int i; 528 529 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) { 530 available = available_behaviours & BIT(i); 531 active = i == current_behaviour; 532 533 if (available && active) { 534 count += sysfs_emit_at(buf, count, "[%s] ", 535 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 536 match = true; 537 } else if (available) { 538 count += sysfs_emit_at(buf, count, "%s ", 539 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 540 } 541 } 542 543 if (!match) { 544 dev_warn(dev, "driver reporting unsupported charge behaviour\n"); 545 return -EINVAL; 546 } 547 548 if (count) 549 buf[count - 1] = '\n'; 550 551 return count; 552 } 553 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 554 555 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 556 { 557 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 558 559 if (i < 0) 560 return i; 561 562 if (available_behaviours & BIT(i)) 563 return i; 564 565 return -EINVAL; 566 } 567 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 568