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 23struct 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 46static 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 62static 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 75static 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 83static 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 95static 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 113static 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 123static 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 132static 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 138static 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 144static 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#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) 225 226static struct attribute * 227__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1]; 228 229static struct power_supply_attr *to_ps_attr(struct device_attribute *attr) 230{ 231 return container_of(attr, struct power_supply_attr, dev_attr); 232} 233 234static enum power_supply_property dev_attr_psp(struct device_attribute *attr) 235{ 236 return to_ps_attr(attr) - power_supply_attrs; 237} 238 239static ssize_t power_supply_show_usb_type(struct device *dev, 240 const struct power_supply_desc *desc, 241 union power_supply_propval *value, 242 char *buf) 243{ 244 enum power_supply_usb_type usb_type; 245 ssize_t count = 0; 246 bool match = false; 247 int i; 248 249 for (i = 0; i < desc->num_usb_types; ++i) { 250 usb_type = desc->usb_types[i]; 251 252 if (value->intval == usb_type) { 253 count += sysfs_emit_at(buf, count, "[%s] ", 254 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 255 match = true; 256 } else { 257 count += sysfs_emit_at(buf, count, "%s ", 258 POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); 259 } 260 } 261 262 if (!match) { 263 dev_warn(dev, "driver reporting unsupported connected type\n"); 264 return -EINVAL; 265 } 266 267 if (count) 268 buf[count - 1] = '\n'; 269 270 return count; 271} 272 273static ssize_t power_supply_show_property(struct device *dev, 274 struct device_attribute *attr, 275 char *buf) { 276 ssize_t ret; 277 struct power_supply *psy = dev_get_drvdata(dev); 278 struct power_supply_attr *ps_attr = to_ps_attr(attr); 279 enum power_supply_property psp = dev_attr_psp(attr); 280 union power_supply_propval value; 281 282 if (psp == POWER_SUPPLY_PROP_TYPE) { 283 value.intval = psy->desc->type; 284 } else { 285 ret = power_supply_get_property(psy, psp, &value); 286 287 if (ret < 0) { 288 if (ret == -ENODATA) 289 dev_dbg_ratelimited(dev, 290 "driver has no data for `%s' property\n", 291 attr->attr.name); 292 else if (ret != -ENODEV && ret != -EAGAIN) 293 dev_err_ratelimited(dev, 294 "driver failed to report `%s' property: %zd\n", 295 attr->attr.name, ret); 296 return ret; 297 } 298 } 299 300 if (ps_attr->text_values_len > 0 && 301 value.intval < ps_attr->text_values_len && value.intval >= 0) { 302 return sysfs_emit(buf, "%s\n", ps_attr->text_values[value.intval]); 303 } 304 305 switch (psp) { 306 case POWER_SUPPLY_PROP_USB_TYPE: 307 ret = power_supply_show_usb_type(dev, psy->desc, 308 &value, 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 ret = sysfs_emit(buf, "%d\n", value.intval); 315 } 316 317 return ret; 318} 319 320static ssize_t power_supply_store_property(struct device *dev, 321 struct device_attribute *attr, 322 const char *buf, size_t count) { 323 ssize_t ret; 324 struct power_supply *psy = dev_get_drvdata(dev); 325 struct power_supply_attr *ps_attr = to_ps_attr(attr); 326 enum power_supply_property psp = dev_attr_psp(attr); 327 union power_supply_propval value; 328 329 ret = -EINVAL; 330 if (ps_attr->text_values_len > 0) { 331 ret = __sysfs_match_string(ps_attr->text_values, 332 ps_attr->text_values_len, buf); 333 } 334 335 /* 336 * If no match was found, then check to see if it is an integer. 337 * Integer values are valid for enums in addition to the text value. 338 */ 339 if (ret < 0) { 340 long long_val; 341 342 ret = kstrtol(buf, 10, &long_val); 343 if (ret < 0) 344 return ret; 345 346 ret = long_val; 347 } 348 349 value.intval = ret; 350 351 ret = power_supply_set_property(psy, psp, &value); 352 if (ret < 0) 353 return ret; 354 355 return count; 356} 357 358static umode_t power_supply_attr_is_visible(struct kobject *kobj, 359 struct attribute *attr, 360 int attrno) 361{ 362 struct device *dev = kobj_to_dev(kobj); 363 struct power_supply *psy = dev_get_drvdata(dev); 364 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; 365 int i; 366 367 if (!power_supply_attrs[attrno].prop_name) 368 return 0; 369 370 if (attrno == POWER_SUPPLY_PROP_TYPE) 371 return mode; 372 373 for (i = 0; i < psy->desc->num_properties; i++) { 374 int property = psy->desc->properties[i]; 375 376 if (property == attrno) { 377 if (psy->desc->property_is_writeable && 378 psy->desc->property_is_writeable(psy, property) > 0) 379 mode |= S_IWUSR; 380 381 return mode; 382 } 383 } 384 385 if (power_supply_battery_info_has_prop(psy->battery_info, attrno)) 386 return mode; 387 388 return 0; 389} 390 391static const struct attribute_group power_supply_attr_group = { 392 .attrs = __power_supply_attrs, 393 .is_visible = power_supply_attr_is_visible, 394}; 395 396static const struct attribute_group *power_supply_attr_groups[] = { 397 &power_supply_attr_group, 398 NULL, 399}; 400 401static void str_to_lower(char *str) 402{ 403 while (*str) { 404 *str = tolower(*str); 405 str++; 406 } 407} 408 409void power_supply_init_attrs(struct device_type *dev_type) 410{ 411 int i; 412 413 dev_type->groups = power_supply_attr_groups; 414 415 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { 416 struct device_attribute *attr; 417 418 if (!power_supply_attrs[i].prop_name) { 419 pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n", 420 __func__, i); 421 sprintf(power_supply_attrs[i].attr_name, "_err_%d", i); 422 } else { 423 str_to_lower(power_supply_attrs[i].attr_name); 424 } 425 426 attr = &power_supply_attrs[i].dev_attr; 427 428 attr->attr.name = power_supply_attrs[i].attr_name; 429 attr->show = power_supply_show_property; 430 attr->store = power_supply_store_property; 431 __power_supply_attrs[i] = &attr->attr; 432 } 433} 434 435static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, 436 enum power_supply_property prop, char *prop_buf) 437{ 438 int ret = 0; 439 struct power_supply_attr *pwr_attr; 440 struct device_attribute *dev_attr; 441 char *line; 442 443 pwr_attr = &power_supply_attrs[prop]; 444 dev_attr = &pwr_attr->dev_attr; 445 446 ret = power_supply_show_property((struct device *)dev, dev_attr, prop_buf); 447 if (ret == -ENODEV || ret == -ENODATA) { 448 /* 449 * When a battery is absent, we expect -ENODEV. Don't abort; 450 * send the uevent with at least the PRESENT=0 property 451 */ 452 return 0; 453 } 454 455 if (ret < 0) 456 return ret; 457 458 line = strchr(prop_buf, '\n'); 459 if (line) 460 *line = 0; 461 462 return add_uevent_var(env, "POWER_SUPPLY_%s=%s", 463 pwr_attr->prop_name, prop_buf); 464} 465 466int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) 467{ 468 const struct power_supply *psy = dev_get_drvdata(dev); 469 const enum power_supply_property *battery_props = 470 power_supply_battery_info_properties; 471 unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT / 472 sizeof(unsigned long) + 1] = {0}; 473 int ret = 0, j; 474 char *prop_buf; 475 476 if (!psy || !psy->desc) { 477 dev_dbg(dev, "No power supply yet\n"); 478 return ret; 479 } 480 481 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); 482 if (ret) 483 return ret; 484 485 /* 486 * Kernel generates KOBJ_REMOVE uevent in device removal path, after 487 * resources have been freed. Exit early to avoid use-after-free. 488 */ 489 if (psy->removing) 490 return 0; 491 492 prop_buf = (char *)get_zeroed_page(GFP_KERNEL); 493 if (!prop_buf) 494 return -ENOMEM; 495 496 ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf); 497 if (ret) 498 goto out; 499 500 for (j = 0; j < psy->desc->num_properties; j++) { 501 set_bit(psy->desc->properties[j], psy_drv_properties); 502 ret = add_prop_uevent(dev, env, psy->desc->properties[j], 503 prop_buf); 504 if (ret) 505 goto out; 506 } 507 508 for (j = 0; j < power_supply_battery_info_properties_size; j++) { 509 if (test_bit(battery_props[j], psy_drv_properties)) 510 continue; 511 if (!power_supply_battery_info_has_prop(psy->battery_info, 512 battery_props[j])) 513 continue; 514 ret = add_prop_uevent(dev, env, battery_props[j], 515 prop_buf); 516 if (ret) 517 goto out; 518 } 519 520out: 521 free_page((unsigned long)prop_buf); 522 523 return ret; 524} 525 526ssize_t power_supply_charge_behaviour_show(struct device *dev, 527 unsigned int available_behaviours, 528 enum power_supply_charge_behaviour current_behaviour, 529 char *buf) 530{ 531 bool match = false, available, active; 532 ssize_t count = 0; 533 int i; 534 535 for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) { 536 available = available_behaviours & BIT(i); 537 active = i == current_behaviour; 538 539 if (available && active) { 540 count += sysfs_emit_at(buf, count, "[%s] ", 541 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 542 match = true; 543 } else if (available) { 544 count += sysfs_emit_at(buf, count, "%s ", 545 POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); 546 } 547 } 548 549 if (!match) { 550 dev_warn(dev, "driver reporting unsupported charge behaviour\n"); 551 return -EINVAL; 552 } 553 554 if (count) 555 buf[count - 1] = '\n'; 556 557 return count; 558} 559EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); 560 561int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) 562{ 563 int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); 564 565 if (i < 0) 566 return i; 567 568 if (available_behaviours & BIT(i)) 569 return i; 570 571 return -EINVAL; 572} 573EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); 574