drivers/power/supply/power_supply_sysfs.c

   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 };
  93
  94 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
  95         [POWER_SUPPLY_HEALTH_UNKNOWN]               = "Unknown",
  96         [POWER_SUPPLY_HEALTH_GOOD]                  = "Good",
  97         [POWER_SUPPLY_HEALTH_OVERHEAT]              = "Overheat",
  98         [POWER_SUPPLY_HEALTH_DEAD]                  = "Dead",
  99         [POWER_SUPPLY_HEALTH_OVERVOLTAGE]           = "Over voltage",
 100         [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE]        = "Unspecified failure",
 101         [POWER_SUPPLY_HEALTH_COLD]                  = "Cold",
 102         [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire",
 103         [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE]   = "Safety timer expire",
 104         [POWER_SUPPLY_HEALTH_OVERCURRENT]           = "Over current",
 105         [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED]  = "Calibration required",
 106         [POWER_SUPPLY_HEALTH_WARM]                  = "Warm",
 107         [POWER_SUPPLY_HEALTH_COOL]                  = "Cool",
 108         [POWER_SUPPLY_HEALTH_HOT]                   = "Hot",
 109 };
 110
 111 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {
 112         [POWER_SUPPLY_TECHNOLOGY_UNKNOWN]       = "Unknown",
 113         [POWER_SUPPLY_TECHNOLOGY_NiMH]          = "NiMH",
 114         [POWER_SUPPLY_TECHNOLOGY_LION]          = "Li-ion",
 115         [POWER_SUPPLY_TECHNOLOGY_LIPO]          = "Li-poly",
 116         [POWER_SUPPLY_TECHNOLOGY_LiFe]          = "LiFe",
 117         [POWER_SUPPLY_TECHNOLOGY_NiCd]          = "NiCd",
 118         [POWER_SUPPLY_TECHNOLOGY_LiMn]          = "LiMn",
 119 };
 120
 121 static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = {
 122         [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN]   = "Unknown",
 123         [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL]  = "Critical",
 124         [POWER_SUPPLY_CAPACITY_LEVEL_LOW]       = "Low",
 125         [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL]    = "Normal",
 126         [POWER_SUPPLY_CAPACITY_LEVEL_HIGH]      = "High",
 127         [POWER_SUPPLY_CAPACITY_LEVEL_FULL]      = "Full",
 128 };
 129
 130 static const char * const POWER_SUPPLY_SCOPE_TEXT[] = {
 131         [POWER_SUPPLY_SCOPE_UNKNOWN]    = "Unknown",
 132         [POWER_SUPPLY_SCOPE_SYSTEM]     = "System",
 133         [POWER_SUPPLY_SCOPE_DEVICE]     = "Device",
 134 };
 135
 136 static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = {
 137         [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO]            = "auto",
 138         [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE]  = "inhibit-charge",
 139         [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge",
 140 };
 141
 142 static struct power_supply_attr power_supply_attrs[] = {
 143         /* Properties of type `int' */
 144         POWER_SUPPLY_ENUM_ATTR(STATUS),
 145         POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE),
 146         POWER_SUPPLY_ENUM_ATTR(HEALTH),
 147         POWER_SUPPLY_ATTR(PRESENT),
 148         POWER_SUPPLY_ATTR(ONLINE),
 149         POWER_SUPPLY_ATTR(AUTHENTIC),
 150         POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY),
 151         POWER_SUPPLY_ATTR(CYCLE_COUNT),
 152         POWER_SUPPLY_ATTR(VOLTAGE_MAX),
 153         POWER_SUPPLY_ATTR(VOLTAGE_MIN),
 154         POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN),
 155         POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN),
 156         POWER_SUPPLY_ATTR(VOLTAGE_NOW),
 157         POWER_SUPPLY_ATTR(VOLTAGE_AVG),
 158         POWER_SUPPLY_ATTR(VOLTAGE_OCV),
 159         POWER_SUPPLY_ATTR(VOLTAGE_BOOT),
 160         POWER_SUPPLY_ATTR(CURRENT_MAX),
 161         POWER_SUPPLY_ATTR(CURRENT_NOW),
 162         POWER_SUPPLY_ATTR(CURRENT_AVG),
 163         POWER_SUPPLY_ATTR(CURRENT_BOOT),
 164         POWER_SUPPLY_ATTR(POWER_NOW),
 165         POWER_SUPPLY_ATTR(POWER_AVG),
 166         POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN),
 167         POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN),
 168         POWER_SUPPLY_ATTR(CHARGE_FULL),
 169         POWER_SUPPLY_ATTR(CHARGE_EMPTY),
 170         POWER_SUPPLY_ATTR(CHARGE_NOW),
 171         POWER_SUPPLY_ATTR(CHARGE_AVG),
 172         POWER_SUPPLY_ATTR(CHARGE_COUNTER),
 173         POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT),
 174         POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX),
 175         POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE),
 176         POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX),
 177         POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT),
 178         POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX),
 179         POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD),
 180         POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD),
 181         POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT),
 182         POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT),
 183         POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT),
 184         POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN),
 185         POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN),
 186         POWER_SUPPLY_ATTR(ENERGY_FULL),
 187         POWER_SUPPLY_ATTR(ENERGY_EMPTY),
 188         POWER_SUPPLY_ATTR(ENERGY_NOW),
 189         POWER_SUPPLY_ATTR(ENERGY_AVG),
 190         POWER_SUPPLY_ATTR(CAPACITY),
 191         POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
 192         POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
 193         POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
 194         POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
 195         POWER_SUPPLY_ATTR(TEMP),
 196         POWER_SUPPLY_ATTR(TEMP_MAX),
 197         POWER_SUPPLY_ATTR(TEMP_MIN),
 198         POWER_SUPPLY_ATTR(TEMP_ALERT_MIN),
 199         POWER_SUPPLY_ATTR(TEMP_ALERT_MAX),
 200         POWER_SUPPLY_ATTR(TEMP_AMBIENT),
 201         POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN),
 202         POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX),
 203         POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW),
 204         POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
 205         POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
 206         POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
 207         POWER_SUPPLY_ENUM_ATTR(TYPE),
 208         POWER_SUPPLY_ATTR(USB_TYPE),
 209         POWER_SUPPLY_ENUM_ATTR(SCOPE),
 210         POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
 211         POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
 212         POWER_SUPPLY_ATTR(CALIBRATE),
 213         POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
 214         POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
 215         POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
 216         /* Properties of type `const char *' */
 217         POWER_SUPPLY_ATTR(MODEL_NAME),
 218         POWER_SUPPLY_ATTR(MANUFACTURER),
 219         POWER_SUPPLY_ATTR(SERIAL_NUMBER),
 220 };
 221
 222 static struct attribute *
 223 __power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
 224
 225 static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
 226 {
 227         return container_of(attr, struct power_supply_attr, dev_attr);
 228 }
 229
 230 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
 231 {
 232         return  to_ps_attr(attr) - power_supply_attrs;
 233 }
 234
 235 static ssize_t power_supply_show_usb_type(struct device *dev,
 236                                           const struct power_supply_desc *desc,
 237                                           union power_supply_propval *value,
 238                                           char *buf)
 239 {
 240         enum power_supply_usb_type usb_type;
 241         ssize_t count = 0;
 242         bool match = false;
 243         int i;
 244
 245         for (i = 0; i < desc->num_usb_types; ++i) {
 246                 usb_type = desc->usb_types[i];
 247
 248                 if (value->intval == usb_type) {
 249                         count += sprintf(buf + count, "[%s] ",
 250                                          POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
 251                         match = true;
 252                 } else {
 253                         count += sprintf(buf + count, "%s ",
 254                                          POWER_SUPPLY_USB_TYPE_TEXT[usb_type]);
 255                 }
 256         }
 257
 258         if (!match) {
 259                 dev_warn(dev, "driver reporting unsupported connected type\n");
 260                 return -EINVAL;
 261         }
 262
 263         if (count)
 264                 buf[count - 1] = '\n';
 265
 266         return count;
 267 }
 268
 269 static ssize_t power_supply_show_property(struct device *dev,
 270                                           struct device_attribute *attr,
 271                                           char *buf) {
 272         ssize_t ret;
 273         struct power_supply *psy = dev_get_drvdata(dev);
 274         struct power_supply_attr *ps_attr = to_ps_attr(attr);
 275         enum power_supply_property psp = dev_attr_psp(attr);
 276         union power_supply_propval value;
 277
 278         if (psp == POWER_SUPPLY_PROP_TYPE) {
 279                 value.intval = psy->desc->type;
 280         } else {
 281                 ret = power_supply_get_property(psy, psp, &value);
 282
 283                 if (ret < 0) {
 284                         if (ret == -ENODATA)
 285                                 dev_dbg(dev, "driver has no data for `%s' property\n",
 286                                         attr->attr.name);
 287                         else if (ret != -ENODEV && ret != -EAGAIN)
 288                                 dev_err_ratelimited(dev,
 289                                         "driver failed to report `%s' property: %zd\n",
 290                                         attr->attr.name, ret);
 291                         return ret;
 292                 }
 293         }
 294
 295         if (ps_attr->text_values_len > 0 &&
 296             value.intval < ps_attr->text_values_len && value.intval >= 0) {
 297                 return sprintf(buf, "%s\n", ps_attr->text_values[value.intval]);
 298         }
 299
 300         switch (psp) {
 301         case POWER_SUPPLY_PROP_USB_TYPE:
 302                 ret = power_supply_show_usb_type(dev, psy->desc,
 303                                                 &value, buf);
 304                 break;
 305         case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
 306                 ret = sprintf(buf, "%s\n", value.strval);
 307                 break;
 308         default:
 309                 ret = sprintf(buf, "%d\n", value.intval);
 310         }
 311
 312         return ret;
 313 }
 314
 315 static ssize_t power_supply_store_property(struct device *dev,
 316                                            struct device_attribute *attr,
 317                                            const char *buf, size_t count) {
 318         ssize_t ret;
 319         struct power_supply *psy = dev_get_drvdata(dev);
 320         struct power_supply_attr *ps_attr = to_ps_attr(attr);
 321         enum power_supply_property psp = dev_attr_psp(attr);
 322         union power_supply_propval value;
 323
 324         ret = -EINVAL;
 325         if (ps_attr->text_values_len > 0) {
 326                 ret = __sysfs_match_string(ps_attr->text_values,
 327                                            ps_attr->text_values_len, buf);
 328         }
 329
 330         /*
 331          * If no match was found, then check to see if it is an integer.
 332          * Integer values are valid for enums in addition to the text value.
 333          */
 334         if (ret < 0) {
 335                 long long_val;
 336
 337                 ret = kstrtol(buf, 10, &long_val);
 338                 if (ret < 0)
 339                         return ret;
 340
 341                 ret = long_val;
 342         }
 343
 344         value.intval = ret;
 345
 346         ret = power_supply_set_property(psy, psp, &value);
 347         if (ret < 0)
 348                 return ret;
 349
 350         return count;
 351 }
 352
 353 static umode_t power_supply_attr_is_visible(struct kobject *kobj,
 354                                            struct attribute *attr,
 355                                            int attrno)
 356 {
 357         struct device *dev = kobj_to_dev(kobj);
 358         struct power_supply *psy = dev_get_drvdata(dev);
 359         umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
 360         int i;
 361
 362         if (!power_supply_attrs[attrno].prop_name)
 363                 return 0;
 364
 365         if (attrno == POWER_SUPPLY_PROP_TYPE)
 366                 return mode;
 367
 368         for (i = 0; i < psy->desc->num_properties; i++) {
 369                 int property = psy->desc->properties[i];
 370
 371                 if (property == attrno) {
 372                         if (psy->desc->property_is_writeable &&
 373                             psy->desc->property_is_writeable(psy, property) > 0)
 374                                 mode |= S_IWUSR;
 375
 376                         return mode;
 377                 }
 378         }
 379
 380         return 0;
 381 }
 382
 383 static const struct attribute_group power_supply_attr_group = {
 384         .attrs = __power_supply_attrs,
 385         .is_visible = power_supply_attr_is_visible,
 386 };
 387
 388 static const struct attribute_group *power_supply_attr_groups[] = {
 389         &power_supply_attr_group,
 390         NULL,
 391 };
 392
 393 static void str_to_lower(char *str)
 394 {
 395         while (*str) {
 396                 *str = tolower(*str);
 397                 str++;
 398         }
 399 }
 400
 401 void power_supply_init_attrs(struct device_type *dev_type)
 402 {
 403         int i;
 404
 405         dev_type->groups = power_supply_attr_groups;
 406
 407         for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) {
 408                 struct device_attribute *attr;
 409
 410                 if (!power_supply_attrs[i].prop_name) {
 411                         pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n",
 412                                 __func__, i);
 413                         sprintf(power_supply_attrs[i].attr_name, "_err_%d", i);
 414                 } else {
 415                         str_to_lower(power_supply_attrs[i].attr_name);
 416                 }
 417
 418                 attr = &power_supply_attrs[i].dev_attr;
 419
 420                 attr->attr.name = power_supply_attrs[i].attr_name;
 421                 attr->show = power_supply_show_property;
 422                 attr->store = power_supply_store_property;
 423                 __power_supply_attrs[i] = &attr->attr;
 424         }
 425 }
 426
 427 static int add_prop_uevent(struct device *dev, struct kobj_uevent_env *env,
 428                            enum power_supply_property prop, char *prop_buf)
 429 {
 430         int ret = 0;
 431         struct power_supply_attr *pwr_attr;
 432         struct device_attribute *dev_attr;
 433         char *line;
 434
 435         pwr_attr = &power_supply_attrs[prop];
 436         dev_attr = &pwr_attr->dev_attr;
 437
 438         ret = power_supply_show_property(dev, dev_attr, prop_buf);
 439         if (ret == -ENODEV || ret == -ENODATA) {
 440                 /*
 441                  * When a battery is absent, we expect -ENODEV. Don't abort;
 442                  * send the uevent with at least the the PRESENT=0 property
 443                  */
 444                 return 0;
 445         }
 446
 447         if (ret < 0)
 448                 return ret;
 449
 450         line = strchr(prop_buf, '\n');
 451         if (line)
 452                 *line = 0;
 453
 454         return add_uevent_var(env, "POWER_SUPPLY_%s=%s",
 455                               pwr_attr->prop_name, prop_buf);
 456 }
 457
 458 int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
 459 {
 460         struct power_supply *psy = dev_get_drvdata(dev);
 461         int ret = 0, j;
 462         char *prop_buf;
 463
 464         if (!psy || !psy->desc) {
 465                 dev_dbg(dev, "No power supply yet\n");
 466                 return ret;
 467         }
 468
 469         ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
 470         if (ret)
 471                 return ret;
 472
 473         prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
 474         if (!prop_buf)
 475                 return -ENOMEM;
 476
 477         ret = add_prop_uevent(dev, env, POWER_SUPPLY_PROP_TYPE, prop_buf);
 478         if (ret)
 479                 goto out;
 480
 481         for (j = 0; j < psy->desc->num_properties; j++) {
 482                 ret = add_prop_uevent(dev, env, psy->desc->properties[j],
 483                                       prop_buf);
 484                 if (ret)
 485                         goto out;
 486         }
 487
 488 out:
 489         free_page((unsigned long)prop_buf);
 490
 491         return ret;
 492 }
 493
 494 ssize_t power_supply_charge_behaviour_show(struct device *dev,
 495                                            unsigned int available_behaviours,
 496                                            enum power_supply_charge_behaviour current_behaviour,
 497                                            char *buf)
 498 {
 499         bool match = false, available, active;
 500         ssize_t count = 0;
 501         int i;
 502
 503         for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) {
 504                 available = available_behaviours & BIT(i);
 505                 active = i == current_behaviour;
 506
 507                 if (available && active) {
 508                         count += sysfs_emit_at(buf, count, "[%s] ",
 509                                                POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
 510                         match = true;
 511                 } else if (available) {
 512                         count += sysfs_emit_at(buf, count, "%s ",
 513                                                POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]);
 514                 }
 515         }
 516
 517         if (!match) {
 518                 dev_warn(dev, "driver reporting unsupported charge behaviour\n");
 519                 return -EINVAL;
 520         }
 521
 522         if (count)
 523                 buf[count - 1] = '\n';
 524
 525         return count;
 526 }
 527 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
 528
 529 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf)
 530 {
 531         int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf);
 532
 533         if (i < 0)
 534                 return i;
 535
 536         if (available_behaviours & BIT(i))
 537                 return i;
 538
 539         return -EINVAL;
 540 }
 541 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);