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 switch (psp) { 302 case POWER_SUPPLY_PROP_USB_TYPE: 303 ret = power_supply_show_usb_type(dev, psy->desc, 304 &value, buf); 305 break; 306 case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: 307 ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours, 308 value.intval, buf); 309 break; 310 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 311 ret = sysfs_emit(buf, "%s\n", value.strval); 312 break; 313 default: 314 if (ps_attr->text_values_len > 0 && 315 value.intval < ps_attr->text_values_len && value.intval >= 0) { 316 ret = sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 317 } else { 318 ret = sysfs_emit(buf, "%d\n", value.intval); 319 } 320 } 321 322 return ret; 323 } 324 325 static ssize_t power_supply_store_property(struct device *dev, 326 struct device_attribute *attr, 327 const char *buf, size_t count) { 328 ssize_t ret; 329 struct power_supply *psy = dev_get_drvdata(dev); 330 struct power_supply_attr *ps_attr = to_ps_attr(attr); 331 enum power_supply_property psp = dev_attr_psp(attr); 332 union power_supply_propval value; 333 334 ret = -EINVAL; 335 if (ps_attr->text_values_len > 0) { 336 ret = __sysfs_match_string(ps_attr->text_values, 337 ps_attr->text_values_len, buf); 338 } 339 340 /* 341 * If no match was found, then check to see if it is an integer. 342 * Integer values are valid for enums in addition to the text value. 343 */ 344 if (ret < 0) { 345 long long_val; 346 347 ret = kstrtol(buf, 10, &long_val); 348 if (ret < 0) 349 return ret; 350 351 ret = long_val; 352 } 353 354 value.intval = ret; 355 356 ret = power_supply_set_property(psy, psp, &value); 357 if (ret < 0) 358 return ret; 359 360 return count; 361 } 362 363 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 364 struct attribute *attr, 365 int attrno) 366 { 367 struct device *dev = kobj_to_dev(kobj); 368 struct power_supply *psy = dev_get_drvdata(dev); 369 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 370 int i; 371 372 if (!power_supply_attrs[attrno].prop_name) 373 return 0; 374 375 if (attrno == POWER_SUPPLY_PROP_TYPE) 376 return mode; 377 378 for (i = 0; i < psy->desc->num_properties; i++) { 379 int property = psy->desc->properties[i]; 380 381 if (property == attrno) { 382 if (power_supply_property_is_writeable(psy, property) > 0) 383 mode |= S_IWUSR; 384 385 return mode; 386 } 387 } 388 389 if (power_supply_battery_info_has_prop(psy->battery_info, attrno)) 390 return mode; 391 392 return 0; 393 } 394 395 static const struct attribute_group power_supply_attr_group = { 396 .attrs = __power_supply_attrs, 397 .is_visible = power_supply_attr_is_visible, 398 }; 399 400 const struct attribute_group *power_supply_attr_groups[] = { 401 &power_supply_attr_group, 402 NULL 403 }; 404 405 void power_supply_init_attrs(void) 406 { 407 int i; 408 409 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 410 struct device_attribute *attr; 411 412 if (!power_supply_attrs[i].prop_name) { 413 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 414 __func__, i); 415 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 416 } else { 417 string_lower(power_supply_attrs[i].attr_name, 418 power_supply_attrs[i].attr_name); 419 } 420 421 attr = &power_supply_attrs[i].dev_attr; 422 423 attr->attr.name = power_supply_attrs[i].attr_name; 424 attr->show = power_supply_show_property; 425 attr->store = power_supply_store_property; 426 __power_supply_attrs[i] = &attr->attr; 427 } 428 } 429 430 static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 431 enum power_supply_property prop, char *prop_buf) 432 { 433 int ret = 0; 434 struct power_supply_attr *pwr_attr; 435 struct device_attribute *dev_attr; 436 char *line; 437 438 pwr_attr = &power_supply_attrs[prop]; 439 dev_attr = &pwr_attr->dev_attr; 440 441 ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf); 442 if (ret == -ENODEV || ret == -ENODATA) { 443 /* 444 * When a battery is absent, we expect -ENODEV. Don't abort; 445 * send the uevent with at least the PRESENT=0 property 446 */ 447 return 0; 448 } 449 450 if (ret < 0) 451 return ret; 452 453 line = strchr(prop_buf, '\n'); 454 if (line) 455 *line = 0; 456 457 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 458 pwr_attr->prop_name, prop_buf); 459 } 460 461 int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 462 { 463 const struct power_supply *psy = dev_get_drvdata(dev); 464 const enum power_supply_property *battery_props = 465 power_supply_battery_info_properties; 466 unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT / 467 sizeof(unsigned long) + 1] = {0}; 468 int ret = 0, j; 469 char *prop_buf; 470 471 if (!psy || !psy->desc) { 472 dev_dbg(dev, "No power supply yet\n"); 473 return ret; 474 } 475 476 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 477 if (ret) 478 return ret; 479 480 /* 481 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 482 * resources have been freed. Exit early to avoid use-after-free. 483 */ 484 if (psy->removing) 485 return 0; 486 487 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 488 if (!prop_buf) 489 return -ENOMEM; 490 491 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 492 if (ret) 493 goto out; 494 495 for (j = 0; j < psy->desc->num_properties; j++) { 496 set_bit(psy->desc->properties[j], psy_drv_properties); 497 ret = add_prop_uevent(dev, env, psy->desc->properties[j], 498 prop_buf); 499 if (ret) 500 goto out; 501 } 502 503 for (j = 0; j < power_supply_battery_info_properties_size; j++) { 504 if (test_bit(battery_props[j], psy_drv_properties)) 505 continue; 506 if (!power_supply_battery_info_has_prop(psy->battery_info, 507 battery_props[j])) 508 continue; 509 ret = add_prop_uevent(dev, env, battery_props[j], 510 prop_buf); 511 if (ret) 512 goto out; 513 } 514 515 out: 516 free_page((unsigned long)prop_buf); 517 518 return ret; 519 } 520 521 ssize_t power_supply_charge_behaviour_show(struct device *dev, 522 unsigned int available_behaviours, 523 enum power_supply_charge_behaviour current_behaviour, 524 char *buf) 525 { 526 bool match = false, available, active; 527 ssize_t count = 0; 528 int i; 529 530 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) { 531 available = available_behaviours & BIT(i); 532 active = i == current_behaviour; 533 534 if (available && active) { 535 count += sysfs_emit_at(buf, count, "[%s] ", 536 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 537 match = true; 538 } else if (available) { 539 count += sysfs_emit_at(buf, count, "%s ", 540 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 541 } 542 } 543 544 if (!match) { 545 dev_warn(dev, "driver reporting unsupported charge behaviour\n"); 546 return -EINVAL; 547 } 548 549 if (count) 550 buf[count - 1] = '\n'; 551 552 return count; 553 } 554 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 555 556 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 557 { 558 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 559 560 if (i < 0) 561 return i; 562 563 if (available_behaviours & BIT(i)) 564 return i; 565 566 return -EINVAL; 567 } 568 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 569