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 19 #include "power_supply.h" 20 21 #define MAX_PROP_NAME_LEN 30 22 23 struct power_supply_attr { 24 const char *prop_name; 25 char attr_name[MAX_PROP_NAME_LEN + 1]; 26 struct device_attribute dev_attr; 27 const char * const *text_values; 28 int text_values_len; 29 }; 30 31 #define _POWER_SUPPLY_ATTR(_name, _text, _len) \ 32 [POWER_SUPPLY_PROP_ ## _name] = \ 33 { \ 34 .prop_name = #_name, \ 35 .attr_name = #_name "\0", \ 36 .text_values = _text, \ 37 .text_values_len = _len, \ 38 } 39 40 #define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0) 41 #define _POWER_SUPPLY_ENUM_ATTR(_name, _text) \ 42 _POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text)) 43 #define POWER_SUPPLY_ENUM_ATTR(_name) \ 44 _POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT) 45 46 static const char * const POWER_SUPPLY_TYPE_TEXT[] = { 47 [POWER_SUPPLY_TYPE_UNKNOWN] = "Unknown", 48 [POWER_SUPPLY_TYPE_BATTERY] = "Battery", 49 [POWER_SUPPLY_TYPE_UPS] = "UPS", 50 [POWER_SUPPLY_TYPE_MAINS] = "Mains", 51 [POWER_SUPPLY_TYPE_USB] = "USB", 52 [POWER_SUPPLY_TYPE_USB_DCP] = "USB_DCP", 53 [POWER_SUPPLY_TYPE_USB_CDP] = "USB_CDP", 54 [POWER_SUPPLY_TYPE_USB_ACA] = "USB_ACA", 55 [POWER_SUPPLY_TYPE_USB_TYPE_C] = "USB_C", 56 [POWER_SUPPLY_TYPE_USB_PD] = "USB_PD", 57 [POWER_SUPPLY_TYPE_USB_PD_DRP] = "USB_PD_DRP", 58 [POWER_SUPPLY_TYPE_APPLE_BRICK_ID] = "BrickID", 59 [POWER_SUPPLY_TYPE_WIRELESS] = "Wireless", 60 }; 61 62 static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = { 63 [POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown", 64 [POWER_SUPPLY_USB_TYPE_SDP] = "SDP", 65 [POWER_SUPPLY_USB_TYPE_DCP] = "DCP", 66 [POWER_SUPPLY_USB_TYPE_CDP] = "CDP", 67 [POWER_SUPPLY_USB_TYPE_ACA] = "ACA", 68 [POWER_SUPPLY_USB_TYPE_C] = "C", 69 [POWER_SUPPLY_USB_TYPE_PD] = "PD", 70 [POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP", 71 [POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS", 72 [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID", 73 }; 74 75 static const char * const POWER_SUPPLY_STATUS_TEXT[] = { 76 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown", 77 [POWER_SUPPLY_STATUS_CHARGING] = "Charging", 78 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging", 79 [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging", 80 [POWER_SUPPLY_STATUS_FULL] = "Full", 81 }; 82 83 static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = { 84 [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown", 85 [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A", 86 [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle", 87 [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast", 88 [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard", 89 [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive", 90 [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom", 91 [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life", 92 [POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass", 93 }; 94 95 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = { 96 [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown", 97 [POWER_SUPPLY_HEALTH_GOOD] = "Good", 98 [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat", 99 [POWER_SUPPLY_HEALTH_DEAD] = "Dead", 100 [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage", 101 [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure", 102 [POWER_SUPPLY_HEALTH_COLD] = "Cold", 103 [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire", 104 [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire", 105 [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current", 106 [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required", 107 [POWER_SUPPLY_HEALTH_WARM] = "Warm", 108 [POWER_SUPPLY_HEALTH_COOL] = "Cool", 109 [POWER_SUPPLY_HEALTH_HOT] = "Hot", 110 [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery", 111 }; 112 113 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = { 114 [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown", 115 [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH", 116 [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion", 117 [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly", 118 [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe", 119 [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd", 120 [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn", 121 }; 122 123 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = { 124 [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown", 125 [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical", 126 [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low", 127 [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal", 128 [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High", 129 [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full", 130 }; 131 132 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { 133 [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown", 134 [POWER_SUPPLY_SCOPE_SYSTEM] = "System", 135 [POWER_SUPPLY_SCOPE_DEVICE] = "Device", 136 }; 137 138 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = { 139 [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto", 140 [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge", 141 [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge", 142 }; 143 144 static struct power_supply_attr power_supply_attrs[] = { 145 /* Properties of type `int' */ 146 POWER_SUPPLY_ENUM_ATTR(STATUS), 147 POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE), 148 POWER_SUPPLY_ENUM_ATTR(HEALTH), 149 POWER_SUPPLY_ATTR(PRESENT), 150 POWER_SUPPLY_ATTR(ONLINE), 151 POWER_SUPPLY_ATTR(AUTHENTIC), 152 POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY), 153 POWER_SUPPLY_ATTR(CYCLE_COUNT), 154 POWER_SUPPLY_ATTR(VOLTAGE_MAX), 155 POWER_SUPPLY_ATTR(VOLTAGE_MIN), 156 POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN), 157 POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN), 158 POWER_SUPPLY_ATTR(VOLTAGE_NOW), 159 POWER_SUPPLY_ATTR(VOLTAGE_AVG), 160 POWER_SUPPLY_ATTR(VOLTAGE_OCV), 161 POWER_SUPPLY_ATTR(VOLTAGE_BOOT), 162 POWER_SUPPLY_ATTR(CURRENT_MAX), 163 POWER_SUPPLY_ATTR(CURRENT_NOW), 164 POWER_SUPPLY_ATTR(CURRENT_AVG), 165 POWER_SUPPLY_ATTR(CURRENT_BOOT), 166 POWER_SUPPLY_ATTR(POWER_NOW), 167 POWER_SUPPLY_ATTR(POWER_AVG), 168 POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN), 169 POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN), 170 POWER_SUPPLY_ATTR(CHARGE_FULL), 171 POWER_SUPPLY_ATTR(CHARGE_EMPTY), 172 POWER_SUPPLY_ATTR(CHARGE_NOW), 173 POWER_SUPPLY_ATTR(CHARGE_AVG), 174 POWER_SUPPLY_ATTR(CHARGE_COUNTER), 175 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT), 176 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX), 177 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE), 178 POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX), 179 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT), 180 POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX), 181 POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD), 182 POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD), 183 POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR), 184 POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT), 185 POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT), 186 POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT), 187 POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN), 188 POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN), 189 POWER_SUPPLY_ATTR(ENERGY_FULL), 190 POWER_SUPPLY_ATTR(ENERGY_EMPTY), 191 POWER_SUPPLY_ATTR(ENERGY_NOW), 192 POWER_SUPPLY_ATTR(ENERGY_AVG), 193 POWER_SUPPLY_ATTR(CAPACITY), 194 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN), 195 POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX), 196 POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN), 197 POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL), 198 POWER_SUPPLY_ATTR(TEMP), 199 POWER_SUPPLY_ATTR(TEMP_MAX), 200 POWER_SUPPLY_ATTR(TEMP_MIN), 201 POWER_SUPPLY_ATTR(TEMP_ALERT_MIN), 202 POWER_SUPPLY_ATTR(TEMP_ALERT_MAX), 203 POWER_SUPPLY_ATTR(TEMP_AMBIENT), 204 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN), 205 POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX), 206 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW), 207 POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG), 208 POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW), 209 POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG), 210 POWER_SUPPLY_ENUM_ATTR(TYPE), 211 POWER_SUPPLY_ATTR(USB_TYPE), 212 POWER_SUPPLY_ENUM_ATTR(SCOPE), 213 POWER_SUPPLY_ATTR(PRECHARGE_CURRENT), 214 POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT), 215 POWER_SUPPLY_ATTR(CALIBRATE), 216 POWER_SUPPLY_ATTR(MANUFACTURE_YEAR), 217 POWER_SUPPLY_ATTR(MANUFACTURE_MONTH), 218 POWER_SUPPLY_ATTR(MANUFACTURE_DAY), 219 /* Properties of type `const char *' */ 220 POWER_SUPPLY_ATTR(MODEL_NAME), 221 POWER_SUPPLY_ATTR(MANUFACTURER), 222 POWER_SUPPLY_ATTR(SERIAL_NUMBER), 223 }; 224 225 static struct attribute * 226 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1]; 227 228 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr) 229 { 230 return container_of(attr, struct power_supply_attr, dev_attr); 231 } 232 233 static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 234 { 235 return to_ps_attr(attr) - power_supply_attrs; 236 } 237 238 static ssize_t power_supply_show_usb_type(struct device *dev, 239 const struct power_supply_desc *desc, 240 union power_supply_propval *value, 241 char *buf) 242 { 243 enum power_supply_usb_type usb_type; 244 ssize_t count = 0; 245 bool match = false; 246 int i; 247 248 for (i = 0; i < desc->num_usb_types; ++i) { 249 usb_type = desc->usb_types[i]; 250 251 if (value->intval == usb_type) { 252 count += sprintf(buf + count, "[%s] ", 253 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 254 match = true; 255 } else { 256 count += sprintf(buf + count, "%s ", 257 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 258 } 259 } 260 261 if (!match) { 262 dev_warn(dev, "driver reporting unsupported connected type\n"); 263 return -EINVAL; 264 } 265 266 if (count) 267 buf[count - 1] = '\n'; 268 269 return count; 270 } 271 272 static ssize_t power_supply_show_property(struct device *dev, 273 struct device_attribute *attr, 274 char *buf) { 275 ssize_t ret; 276 struct power_supply *psy = dev_get_drvdata(dev); 277 struct power_supply_attr *ps_attr = to_ps_attr(attr); 278 enum power_supply_property psp = dev_attr_psp(attr); 279 union power_supply_propval value; 280 281 if (psp == POWER_SUPPLY_PROP_TYPE) { 282 value.intval = psy->desc->type; 283 } else { 284 ret = power_supply_get_property(psy, psp, &value); 285 286 if (ret < 0) { 287 if (ret == -ENODATA) 288 dev_dbg(dev, "driver has no data for `%s' property\n", 289 attr->attr.name); 290 else if (ret != -ENODEV && ret != -EAGAIN) 291 dev_err_ratelimited(dev, 292 "driver failed to report `%s' property: %zd\n", 293 attr->attr.name, ret); 294 return ret; 295 } 296 } 297 298 if (ps_attr->text_values_len > 0 && 299 value.intval < ps_attr->text_values_len && value.intval >= 0) { 300 return sprintf(buf, "%s\n", ps_attr->text_values[value.intval]); 301 } 302 303 switch (psp) { 304 case POWER_SUPPLY_PROP_USB_TYPE: 305 ret = power_supply_show_usb_type(dev, psy->desc, 306 &value, buf); 307 break; 308 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: 309 ret = sprintf(buf, "%s\n", value.strval); 310 break; 311 default: 312 ret = sprintf(buf, "%d\n", value.intval); 313 } 314 315 return ret; 316 } 317 318 static ssize_t power_supply_store_property(struct device *dev, 319 struct device_attribute *attr, 320 const char *buf, size_t count) { 321 ssize_t ret; 322 struct power_supply *psy = dev_get_drvdata(dev); 323 struct power_supply_attr *ps_attr = to_ps_attr(attr); 324 enum power_supply_property psp = dev_attr_psp(attr); 325 union power_supply_propval value; 326 327 ret = -EINVAL; 328 if (ps_attr->text_values_len > 0) { 329 ret = __sysfs_match_string(ps_attr->text_values, 330 ps_attr->text_values_len, buf); 331 } 332 333 /* 334 * If no match was found, then check to see if it is an integer. 335 * Integer values are valid for enums in addition to the text value. 336 */ 337 if (ret < 0) { 338 long long_val; 339 340 ret = kstrtol(buf, 10, &long_val); 341 if (ret < 0) 342 return ret; 343 344 ret = long_val; 345 } 346 347 value.intval = ret; 348 349 ret = power_supply_set_property(psy, psp, &value); 350 if (ret < 0) 351 return ret; 352 353 return count; 354 } 355 356 static umode_t power_supply_attr_is_visible(struct kobject *kobj, 357 struct attribute *attr, 358 int attrno) 359 { 360 struct device *dev = kobj_to_dev(kobj); 361 struct power_supply *psy = dev_get_drvdata(dev); 362 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 363 int i; 364 365 if (!power_supply_attrs[attrno].prop_name) 366 return 0; 367 368 if (attrno == POWER_SUPPLY_PROP_TYPE) 369 return mode; 370 371 for (i = 0; i < psy->desc->num_properties; i++) { 372 int property = psy->desc->properties[i]; 373 374 if (property == attrno) { 375 if (psy->desc->property_is_writeable && 376 psy->desc->property_is_writeable(psy, property) > 0) 377 mode |= S_IWUSR; 378 379 return mode; 380 } 381 } 382 383 return 0; 384 } 385 386 static const struct attribute_group power_supply_attr_group = { 387 .attrs = __power_supply_attrs, 388 .is_visible = power_supply_attr_is_visible, 389 }; 390 391 static const struct attribute_group *power_supply_attr_groups[] = { 392 &power_supply_attr_group, 393 NULL, 394 }; 395 396 static void str_to_lower(char *str) 397 { 398 while (*str) { 399 *str = tolower(*str); 400 str++; 401 } 402 } 403 404 void power_supply_init_attrs(struct device_type *dev_type) 405 { 406 int i; 407 408 dev_type->groups = power_supply_attr_groups; 409 410 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 411 struct device_attribute *attr; 412 413 if (!power_supply_attrs[i].prop_name) { 414 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 415 __func__, i); 416 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 417 } else { 418 str_to_lower(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 int ret = 0, j; 465 char *prop_buf; 466 467 if (!psy || !psy->desc) { 468 dev_dbg(dev, "No power supply yet\n"); 469 return ret; 470 } 471 472 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 473 if (ret) 474 return ret; 475 476 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 477 if (!prop_buf) 478 return -ENOMEM; 479 480 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 481 if (ret) 482 goto out; 483 484 for (j = 0; j < psy->desc->num_properties; j++) { 485 ret = add_prop_uevent(dev, env, psy->desc->properties[j], 486 prop_buf); 487 if (ret) 488 goto out; 489 } 490 491 out: 492 free_page((unsigned long)prop_buf); 493 494 return ret; 495 } 496 497 ssize_t power_supply_charge_behaviour_show(struct device *dev, 498 unsigned int available_behaviours, 499 enum power_supply_charge_behaviour current_behaviour, 500 char *buf) 501 { 502 bool match = false, available, active; 503 ssize_t count = 0; 504 int i; 505 506 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) { 507 available = available_behaviours & BIT(i); 508 active = i == current_behaviour; 509 510 if (available && active) { 511 count += sysfs_emit_at(buf, count, "[%s] ", 512 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 513 match = true; 514 } else if (available) { 515 count += sysfs_emit_at(buf, count, "%s ", 516 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 517 } 518 } 519 520 if (!match) { 521 dev_warn(dev, "driver reporting unsupported charge behaviour\n"); 522 return -EINVAL; 523 } 524 525 if (count) 526 buf[count - 1] = '\n'; 527 528 return count; 529 } 530 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 531 532 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 533 { 534 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 535 536 if (i < 0) 537 return i; 538 539 if (available_behaviours & BIT(i)) 540 return i; 541 542 return -EINVAL; 543 } 544 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 545