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         [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 #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)
 225
 226 static struct attribute *
 227 __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];
 228
 229 static 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
 234 static enum power_supply_property dev_attr_psp(struct device_attribute *attr)
 235 {
 236         return  to_ps_attr(attr) - power_supply_attrs;
 237 }
 238
 239 static 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
 273 static 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
 320 static 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
 358 static 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
 391 static const struct attribute_group power_supply_attr_group = {
 392         .attrs = __power_supply_attrs,
 393         .is_visible = power_supply_attr_is_visible,
 394 };
 395
 396 static const struct attribute_group *power_supply_attr_groups[] = {
 397         &power_supply_attr_group,
 398         NULL,
 399 };
 400
 401 static void str_to_lower(char *str)
 402 {
 403         while (*str) {
 404                 *str = tolower(*str);
 405                 str++;
 406         }
 407 }
 408
 409 void 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
 435 static 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
 466 int 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
 520 out:
 521         free_page((unsigned long)prop_buf);
 522
 523         return ret;
 524 }
 525
 526 ssize_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 }
 559 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show);
 560
 561 int 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 }
 573 EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse);