1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Universal power supply monitor class 4 * 5 * Copyright © 2007 Anton Vorontsov <[email protected]> 6 * Copyright © 2004 Szabolcs Gyurko 7 * Copyright © 2003 Ian Molton <[email protected]> 8 * 9 * Modified: 2004, Oct Szabolcs Gyurko 10 */ 11 12 #ifndef __LINUX_POWER_SUPPLY_H__ 13 #define __LINUX_POWER_SUPPLY_H__ 14 15 #include <linux/device.h> 16 #include <linux/workqueue.h> 17 #include <linux/leds.h> 18 #include <linux/spinlock.h> 19 #include <linux/notifier.h> 20 21 /* 22 * All voltages, currents, charges, energies, time and temperatures in uV, 23 * µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise 24 * stated. It's driver's job to convert its raw values to units in which 25 * this class operates. 26 */ 27 28 /* 29 * For systems where the charger determines the maximum battery capacity 30 * the min and max fields should be used to present these values to user 31 * space. Unused/unknown fields will not appear in sysfs. 32 */ 33 34 enum { 35 POWER_SUPPLY_STATUS_UNKNOWN = 0, 36 POWER_SUPPLY_STATUS_CHARGING, 37 POWER_SUPPLY_STATUS_DISCHARGING, 38 POWER_SUPPLY_STATUS_NOT_CHARGING, 39 POWER_SUPPLY_STATUS_FULL, 40 }; 41 42 /* What algorithm is the charger using? */ 43 enum { 44 POWER_SUPPLY_CHARGE_TYPE_UNKNOWN = 0, 45 POWER_SUPPLY_CHARGE_TYPE_NONE, 46 POWER_SUPPLY_CHARGE_TYPE_TRICKLE, /* slow speed */ 47 POWER_SUPPLY_CHARGE_TYPE_FAST, /* fast speed */ 48 POWER_SUPPLY_CHARGE_TYPE_STANDARD, /* normal speed */ 49 POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE, /* dynamically adjusted speed */ 50 POWER_SUPPLY_CHARGE_TYPE_CUSTOM, /* use CHARGE_CONTROL_* props */ 51 POWER_SUPPLY_CHARGE_TYPE_LONGLIFE, /* slow speed, longer life */ 52 POWER_SUPPLY_CHARGE_TYPE_BYPASS, /* bypassing the charger */ 53 }; 54 55 enum { 56 POWER_SUPPLY_HEALTH_UNKNOWN = 0, 57 POWER_SUPPLY_HEALTH_GOOD, 58 POWER_SUPPLY_HEALTH_OVERHEAT, 59 POWER_SUPPLY_HEALTH_DEAD, 60 POWER_SUPPLY_HEALTH_OVERVOLTAGE, 61 POWER_SUPPLY_HEALTH_UNSPEC_FAILURE, 62 POWER_SUPPLY_HEALTH_COLD, 63 POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE, 64 POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE, 65 POWER_SUPPLY_HEALTH_OVERCURRENT, 66 POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED, 67 POWER_SUPPLY_HEALTH_WARM, 68 POWER_SUPPLY_HEALTH_COOL, 69 POWER_SUPPLY_HEALTH_HOT, 70 POWER_SUPPLY_HEALTH_NO_BATTERY, 71 }; 72 73 enum { 74 POWER_SUPPLY_TECHNOLOGY_UNKNOWN = 0, 75 POWER_SUPPLY_TECHNOLOGY_NiMH, 76 POWER_SUPPLY_TECHNOLOGY_LION, 77 POWER_SUPPLY_TECHNOLOGY_LIPO, 78 POWER_SUPPLY_TECHNOLOGY_LiFe, 79 POWER_SUPPLY_TECHNOLOGY_NiCd, 80 POWER_SUPPLY_TECHNOLOGY_LiMn, 81 }; 82 83 enum { 84 POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN = 0, 85 POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL, 86 POWER_SUPPLY_CAPACITY_LEVEL_LOW, 87 POWER_SUPPLY_CAPACITY_LEVEL_NORMAL, 88 POWER_SUPPLY_CAPACITY_LEVEL_HIGH, 89 POWER_SUPPLY_CAPACITY_LEVEL_FULL, 90 }; 91 92 enum { 93 POWER_SUPPLY_SCOPE_UNKNOWN = 0, 94 POWER_SUPPLY_SCOPE_SYSTEM, 95 POWER_SUPPLY_SCOPE_DEVICE, 96 }; 97 98 enum power_supply_property { 99 /* Properties of type `int' */ 100 POWER_SUPPLY_PROP_STATUS = 0, 101 POWER_SUPPLY_PROP_CHARGE_TYPE, 102 POWER_SUPPLY_PROP_HEALTH, 103 POWER_SUPPLY_PROP_PRESENT, 104 POWER_SUPPLY_PROP_ONLINE, 105 POWER_SUPPLY_PROP_AUTHENTIC, 106 POWER_SUPPLY_PROP_TECHNOLOGY, 107 POWER_SUPPLY_PROP_CYCLE_COUNT, 108 POWER_SUPPLY_PROP_VOLTAGE_MAX, 109 POWER_SUPPLY_PROP_VOLTAGE_MIN, 110 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 111 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 112 POWER_SUPPLY_PROP_VOLTAGE_NOW, 113 POWER_SUPPLY_PROP_VOLTAGE_AVG, 114 POWER_SUPPLY_PROP_VOLTAGE_OCV, 115 POWER_SUPPLY_PROP_VOLTAGE_BOOT, 116 POWER_SUPPLY_PROP_CURRENT_MAX, 117 POWER_SUPPLY_PROP_CURRENT_NOW, 118 POWER_SUPPLY_PROP_CURRENT_AVG, 119 POWER_SUPPLY_PROP_CURRENT_BOOT, 120 POWER_SUPPLY_PROP_POWER_NOW, 121 POWER_SUPPLY_PROP_POWER_AVG, 122 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 123 POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, 124 POWER_SUPPLY_PROP_CHARGE_FULL, 125 POWER_SUPPLY_PROP_CHARGE_EMPTY, 126 POWER_SUPPLY_PROP_CHARGE_NOW, 127 POWER_SUPPLY_PROP_CHARGE_AVG, 128 POWER_SUPPLY_PROP_CHARGE_COUNTER, 129 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 130 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 131 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 132 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 133 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, 134 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, 135 POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD, /* in percents! */ 136 POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD, /* in percents! */ 137 POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR, 138 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 139 POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT, 140 POWER_SUPPLY_PROP_INPUT_POWER_LIMIT, 141 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 142 POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN, 143 POWER_SUPPLY_PROP_ENERGY_FULL, 144 POWER_SUPPLY_PROP_ENERGY_EMPTY, 145 POWER_SUPPLY_PROP_ENERGY_NOW, 146 POWER_SUPPLY_PROP_ENERGY_AVG, 147 POWER_SUPPLY_PROP_CAPACITY, /* in percents! */ 148 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, /* in percents! */ 149 POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX, /* in percents! */ 150 POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, /* in percents! */ 151 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 152 POWER_SUPPLY_PROP_TEMP, 153 POWER_SUPPLY_PROP_TEMP_MAX, 154 POWER_SUPPLY_PROP_TEMP_MIN, 155 POWER_SUPPLY_PROP_TEMP_ALERT_MIN, 156 POWER_SUPPLY_PROP_TEMP_ALERT_MAX, 157 POWER_SUPPLY_PROP_TEMP_AMBIENT, 158 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN, 159 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX, 160 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 161 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 162 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, 163 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 164 POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */ 165 POWER_SUPPLY_PROP_USB_TYPE, 166 POWER_SUPPLY_PROP_SCOPE, 167 POWER_SUPPLY_PROP_PRECHARGE_CURRENT, 168 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 169 POWER_SUPPLY_PROP_CALIBRATE, 170 POWER_SUPPLY_PROP_MANUFACTURE_YEAR, 171 POWER_SUPPLY_PROP_MANUFACTURE_MONTH, 172 POWER_SUPPLY_PROP_MANUFACTURE_DAY, 173 /* Properties of type `const char *' */ 174 POWER_SUPPLY_PROP_MODEL_NAME, 175 POWER_SUPPLY_PROP_MANUFACTURER, 176 POWER_SUPPLY_PROP_SERIAL_NUMBER, 177 }; 178 179 enum power_supply_type { 180 POWER_SUPPLY_TYPE_UNKNOWN = 0, 181 POWER_SUPPLY_TYPE_BATTERY, 182 POWER_SUPPLY_TYPE_UPS, 183 POWER_SUPPLY_TYPE_MAINS, 184 POWER_SUPPLY_TYPE_USB, /* Standard Downstream Port */ 185 POWER_SUPPLY_TYPE_USB_DCP, /* Dedicated Charging Port */ 186 POWER_SUPPLY_TYPE_USB_CDP, /* Charging Downstream Port */ 187 POWER_SUPPLY_TYPE_USB_ACA, /* Accessory Charger Adapters */ 188 POWER_SUPPLY_TYPE_USB_TYPE_C, /* Type C Port */ 189 POWER_SUPPLY_TYPE_USB_PD, /* Power Delivery Port */ 190 POWER_SUPPLY_TYPE_USB_PD_DRP, /* PD Dual Role Port */ 191 POWER_SUPPLY_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */ 192 POWER_SUPPLY_TYPE_WIRELESS, /* Wireless */ 193 }; 194 195 enum power_supply_usb_type { 196 POWER_SUPPLY_USB_TYPE_UNKNOWN = 0, 197 POWER_SUPPLY_USB_TYPE_SDP, /* Standard Downstream Port */ 198 POWER_SUPPLY_USB_TYPE_DCP, /* Dedicated Charging Port */ 199 POWER_SUPPLY_USB_TYPE_CDP, /* Charging Downstream Port */ 200 POWER_SUPPLY_USB_TYPE_ACA, /* Accessory Charger Adapters */ 201 POWER_SUPPLY_USB_TYPE_C, /* Type C Port */ 202 POWER_SUPPLY_USB_TYPE_PD, /* Power Delivery Port */ 203 POWER_SUPPLY_USB_TYPE_PD_DRP, /* PD Dual Role Port */ 204 POWER_SUPPLY_USB_TYPE_PD_PPS, /* PD Programmable Power Supply */ 205 POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID, /* Apple Charging Method */ 206 }; 207 208 enum power_supply_charge_behaviour { 209 POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO = 0, 210 POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE, 211 POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE, 212 }; 213 214 enum power_supply_notifier_events { 215 PSY_EVENT_PROP_CHANGED, 216 }; 217 218 union power_supply_propval { 219 int intval; 220 const char *strval; 221 }; 222 223 struct device_node; 224 struct power_supply; 225 226 /* Run-time specific power supply configuration */ 227 struct power_supply_config { 228 struct device_node *of_node; 229 struct fwnode_handle *fwnode; 230 231 /* Driver private data */ 232 void *drv_data; 233 234 /* Device specific sysfs attributes */ 235 const struct attribute_group **attr_grp; 236 237 char **supplied_to; 238 size_t num_supplicants; 239 }; 240 241 /* Description of power supply */ 242 struct power_supply_desc { 243 const char *name; 244 enum power_supply_type type; 245 u8 charge_behaviours; 246 const enum power_supply_usb_type *usb_types; 247 size_t num_usb_types; 248 const enum power_supply_property *properties; 249 size_t num_properties; 250 251 /* 252 * Functions for drivers implementing power supply class. 253 * These shouldn't be called directly by other drivers for accessing 254 * this power supply. Instead use power_supply_*() functions (for 255 * example power_supply_get_property()). 256 */ 257 int (*get_property)(struct power_supply *psy, 258 enum power_supply_property psp, 259 union power_supply_propval *val); 260 int (*set_property)(struct power_supply *psy, 261 enum power_supply_property psp, 262 const union power_supply_propval *val); 263 /* 264 * property_is_writeable() will be called during registration 265 * of power supply. If this happens during device probe then it must 266 * not access internal data of device (because probe did not end). 267 */ 268 int (*property_is_writeable)(struct power_supply *psy, 269 enum power_supply_property psp); 270 void (*external_power_changed)(struct power_supply *psy); 271 void (*set_charged)(struct power_supply *psy); 272 273 /* 274 * Set if thermal zone should not be created for this power supply. 275 * For example for virtual supplies forwarding calls to actual 276 * sensors or other supplies. 277 */ 278 bool no_thermal; 279 /* For APM emulation, think legacy userspace. */ 280 int use_for_apm; 281 }; 282 283 struct power_supply { 284 const struct power_supply_desc *desc; 285 286 char **supplied_to; 287 size_t num_supplicants; 288 289 char **supplied_from; 290 size_t num_supplies; 291 struct device_node *of_node; 292 293 /* Driver private data */ 294 void *drv_data; 295 296 /* private */ 297 struct device dev; 298 struct work_struct changed_work; 299 struct delayed_work deferred_register_work; 300 spinlock_t changed_lock; 301 bool changed; 302 bool initialized; 303 bool removing; 304 atomic_t use_cnt; 305 struct power_supply_battery_info *battery_info; 306 #ifdef CONFIG_THERMAL 307 struct thermal_zone_device *tzd; 308 struct thermal_cooling_device *tcd; 309 #endif 310 311 #ifdef CONFIG_LEDS_TRIGGERS 312 struct led_trigger *charging_full_trig; 313 char *charging_full_trig_name; 314 struct led_trigger *charging_trig; 315 char *charging_trig_name; 316 struct led_trigger *full_trig; 317 char *full_trig_name; 318 struct led_trigger *online_trig; 319 char *online_trig_name; 320 struct led_trigger *charging_blink_full_solid_trig; 321 char *charging_blink_full_solid_trig_name; 322 struct led_trigger *charging_orange_full_green_trig; 323 char *charging_orange_full_green_trig_name; 324 #endif 325 }; 326 327 /* 328 * This is recommended structure to specify static power supply parameters. 329 * Generic one, parametrizable for different power supplies. Power supply 330 * class itself does not use it, but that's what implementing most platform 331 * drivers, should try reuse for consistency. 332 */ 333 334 struct power_supply_info { 335 const char *name; 336 int technology; 337 int voltage_max_design; 338 int voltage_min_design; 339 int charge_full_design; 340 int charge_empty_design; 341 int energy_full_design; 342 int energy_empty_design; 343 int use_for_apm; 344 }; 345 346 struct power_supply_battery_ocv_table { 347 int ocv; /* microVolts */ 348 int capacity; /* percent */ 349 }; 350 351 struct power_supply_resistance_temp_table { 352 int temp; /* celsius */ 353 int resistance; /* internal resistance percent */ 354 }; 355 356 struct power_supply_vbat_ri_table { 357 int vbat_uv; /* Battery voltage in microvolt */ 358 int ri_uohm; /* Internal resistance in microohm */ 359 }; 360 361 /** 362 * struct power_supply_maintenance_charge_table - setting for maintenace charging 363 * @charge_current_max_ua: maintenance charging current that is used to keep 364 * the charge of the battery full as current is consumed after full charging. 365 * The corresponding charge_voltage_max_uv is used as a safeguard: when we 366 * reach this voltage the maintenance charging current is turned off. It is 367 * turned back on if we fall below this voltage. 368 * @charge_voltage_max_uv: maintenance charging voltage that is usually a bit 369 * lower than the constant_charge_voltage_max_uv. We can apply this settings 370 * charge_current_max_ua until we get back up to this voltage. 371 * @safety_timer_minutes: maintenance charging safety timer, with an expiry 372 * time in minutes. We will only use maintenance charging in this setting 373 * for a certain amount of time, then we will first move to the next 374 * maintenance charge current and voltage pair in respective array and wait 375 * for the next safety timer timeout, or, if we reached the last maintencance 376 * charging setting, disable charging until we reach 377 * charge_restart_voltage_uv and restart ordinary CC/CV charging from there. 378 * These timers should be chosen to align with the typical discharge curve 379 * for the battery. 380 * 381 * Ordinary CC/CV charging will stop charging when the charge current goes 382 * below charge_term_current_ua, and then restart it (if the device is still 383 * plugged into the charger) at charge_restart_voltage_uv. This happens in most 384 * consumer products because the power usage while connected to a charger is 385 * not zero, and devices are not manufactured to draw power directly from the 386 * charger: instead they will at all times dissipate the battery a little, like 387 * the power used in standby mode. This will over time give a charge graph 388 * such as this: 389 * 390 * Energy 391 * ^ ... ... ... ... ... ... ... 392 * | . . . . . . . . . . . . . 393 * | .. . .. . .. . .. . .. . .. . .. 394 * |. .. .. .. .. .. .. 395 * +-------------------------------------------------------------------> t 396 * 397 * Practically this means that the Li-ions are wandering back and forth in the 398 * battery and this causes degeneration of the battery anode and cathode. 399 * To prolong the life of the battery, maintenance charging is applied after 400 * reaching charge_term_current_ua to hold up the charge in the battery while 401 * consuming power, thus lowering the wear on the battery: 402 * 403 * Energy 404 * ^ ....................................... 405 * | . ...................... 406 * | .. 407 * |. 408 * +-------------------------------------------------------------------> t 409 * 410 * Maintenance charging uses the voltages from this table: a table of settings 411 * is traversed using a slightly lower current and voltage than what is used for 412 * CC/CV charging. The maintenance charging will for safety reasons not go on 413 * indefinately: we lower the current and voltage with successive maintenance 414 * settings, then disable charging completely after we reach the last one, 415 * and after that we do not restart charging until we reach 416 * charge_restart_voltage_uv (see struct power_supply_battery_info) and restart 417 * ordinary CC/CV charging from there. 418 * 419 * As an example, a Samsung EB425161LA Lithium-Ion battery is CC/CV charged 420 * at 900mA to 4340mV, then maintenance charged at 600mA and 4150mV for up to 421 * 60 hours, then maintenance charged at 600mA and 4100mV for up to 200 hours. 422 * After this the charge cycle is restarted waiting for 423 * charge_restart_voltage_uv. 424 * 425 * For most mobile electronics this type of maintenance charging is enough for 426 * the user to disconnect the device and make use of it before both maintenance 427 * charging cycles are complete, if the current and voltage has been chosen 428 * appropriately. These need to be determined from battery discharge curves 429 * and expected standby current. 430 * 431 * If the voltage anyway drops to charge_restart_voltage_uv during maintenance 432 * charging, ordinary CC/CV charging is restarted. This can happen if the 433 * device is e.g. actively used during charging, so more current is drawn than 434 * the expected stand-by current. Also overvoltage protection will be applied 435 * as usual. 436 */ 437 struct power_supply_maintenance_charge_table { 438 int charge_current_max_ua; 439 int charge_voltage_max_uv; 440 int charge_safety_timer_minutes; 441 }; 442 443 #define POWER_SUPPLY_OCV_TEMP_MAX 20 444 445 /** 446 * struct power_supply_battery_info - information about batteries 447 * @technology: from the POWER_SUPPLY_TECHNOLOGY_* enum 448 * @energy_full_design_uwh: energy content when fully charged in microwatt 449 * hours 450 * @charge_full_design_uah: charge content when fully charged in microampere 451 * hours 452 * @voltage_min_design_uv: minimum voltage across the poles when the battery 453 * is at minimum voltage level in microvolts. If the voltage drops below this 454 * level the battery will need precharging when using CC/CV charging. 455 * @voltage_max_design_uv: voltage across the poles when the battery is fully 456 * charged in microvolts. This is the "nominal voltage" i.e. the voltage 457 * printed on the label of the battery. 458 * @tricklecharge_current_ua: the tricklecharge current used when trickle 459 * charging the battery in microamperes. This is the charging phase when the 460 * battery is completely empty and we need to carefully trickle in some 461 * charge until we reach the precharging voltage. 462 * @precharge_current_ua: current to use in the precharge phase in microamperes, 463 * the precharge rate is limited by limiting the current to this value. 464 * @precharge_voltage_max_uv: the maximum voltage allowed when precharging in 465 * microvolts. When we pass this voltage we will nominally switch over to the 466 * CC (constant current) charging phase defined by constant_charge_current_ua 467 * and constant_charge_voltage_max_uv. 468 * @charge_term_current_ua: when the current in the CV (constant voltage) 469 * charging phase drops below this value in microamperes the charging will 470 * terminate completely and not restart until the voltage over the battery 471 * poles reach charge_restart_voltage_uv unless we use maintenance charging. 472 * @charge_restart_voltage_uv: when the battery has been fully charged by 473 * CC/CV charging and charging has been disabled, and the voltage subsequently 474 * drops below this value in microvolts, the charging will be restarted 475 * (typically using CV charging). 476 * @overvoltage_limit_uv: If the voltage exceeds the nominal voltage 477 * voltage_max_design_uv and we reach this voltage level, all charging must 478 * stop and emergency procedures take place, such as shutting down the system 479 * in some cases. 480 * @constant_charge_current_max_ua: current in microamperes to use in the CC 481 * (constant current) charging phase. The charging rate is limited 482 * by this current. This is the main charging phase and as the current is 483 * constant into the battery the voltage slowly ascends to 484 * constant_charge_voltage_max_uv. 485 * @constant_charge_voltage_max_uv: voltage in microvolts signifying the end of 486 * the CC (constant current) charging phase and the beginning of the CV 487 * (constant voltage) charging phase. 488 * @maintenance_charge: an array of maintenance charging settings to be used 489 * after the main CC/CV charging phase is complete. 490 * @maintenance_charge_size: the number of maintenance charging settings in 491 * maintenance_charge. 492 * @alert_low_temp_charge_current_ua: The charging current to use if the battery 493 * enters low alert temperature, i.e. if the internal temperature is between 494 * temp_alert_min and temp_min. No matter the charging phase, this 495 * and alert_high_temp_charge_voltage_uv will be applied. 496 * @alert_low_temp_charge_voltage_uv: Same as alert_low_temp_charge_current_ua, 497 * but for the charging voltage. 498 * @alert_high_temp_charge_current_ua: The charging current to use if the 499 * battery enters high alert temperature, i.e. if the internal temperature is 500 * between temp_alert_max and temp_max. No matter the charging phase, this 501 * and alert_high_temp_charge_voltage_uv will be applied, usually lowering 502 * the charging current as an evasive manouver. 503 * @alert_high_temp_charge_voltage_uv: Same as 504 * alert_high_temp_charge_current_ua, but for the charging voltage. 505 * @factory_internal_resistance_uohm: the internal resistance of the battery 506 * at fabrication time, expressed in microohms. This resistance will vary 507 * depending on the lifetime and charge of the battery, so this is just a 508 * nominal ballpark figure. This internal resistance is given for the state 509 * when the battery is discharging. 510 * @factory_internal_resistance_charging_uohm: the internal resistance of the 511 * battery at fabrication time while charging, expressed in microohms. 512 * The charging process will affect the internal resistance of the battery 513 * so this value provides a better resistance under these circumstances. 514 * This resistance will vary depending on the lifetime and charge of the 515 * battery, so this is just a nominal ballpark figure. 516 * @ocv_temp: array indicating the open circuit voltage (OCV) capacity 517 * temperature indices. This is an array of temperatures in degrees Celsius 518 * indicating which capacity table to use for a certain temperature, since 519 * the capacity for reasons of chemistry will be different at different 520 * temperatures. Determining capacity is a multivariate problem and the 521 * temperature is the first variable we determine. 522 * @temp_ambient_alert_min: the battery will go outside of operating conditions 523 * when the ambient temperature goes below this temperature in degrees 524 * Celsius. 525 * @temp_ambient_alert_max: the battery will go outside of operating conditions 526 * when the ambient temperature goes above this temperature in degrees 527 * Celsius. 528 * @temp_alert_min: the battery should issue an alert if the internal 529 * temperature goes below this temperature in degrees Celsius. 530 * @temp_alert_max: the battery should issue an alert if the internal 531 * temperature goes above this temperature in degrees Celsius. 532 * @temp_min: the battery will go outside of operating conditions when 533 * the internal temperature goes below this temperature in degrees Celsius. 534 * Normally this means the system should shut down. 535 * @temp_max: the battery will go outside of operating conditions when 536 * the internal temperature goes above this temperature in degrees Celsius. 537 * Normally this means the system should shut down. 538 * @ocv_table: for each entry in ocv_temp there is a corresponding entry in 539 * ocv_table and a size for each entry in ocv_table_size. These arrays 540 * determine the capacity in percent in relation to the voltage in microvolts 541 * at the indexed temperature. 542 * @ocv_table_size: for each entry in ocv_temp this array is giving the size of 543 * each entry in the array of capacity arrays in ocv_table. 544 * @resist_table: this is a table that correlates a battery temperature to the 545 * expected internal resistance at this temperature. The resistance is given 546 * as a percentage of factory_internal_resistance_uohm. Knowing the 547 * resistance of the battery is usually necessary for calculating the open 548 * circuit voltage (OCV) that is then used with the ocv_table to calculate 549 * the capacity of the battery. The resist_table must be ordered descending 550 * by temperature: highest temperature with lowest resistance first, lowest 551 * temperature with highest resistance last. 552 * @resist_table_size: the number of items in the resist_table. 553 * @vbat2ri_discharging: this is a table that correlates Battery voltage (VBAT) 554 * to internal resistance (Ri). The resistance is given in microohm for the 555 * corresponding voltage in microvolts. The internal resistance is used to 556 * determine the open circuit voltage so that we can determine the capacity 557 * of the battery. These voltages to resistance tables apply when the battery 558 * is discharging. The table must be ordered descending by voltage: highest 559 * voltage first. 560 * @vbat2ri_discharging_size: the number of items in the vbat2ri_discharging 561 * table. 562 * @vbat2ri_charging: same function as vbat2ri_discharging but for the state 563 * when the battery is charging. Being under charge changes the battery's 564 * internal resistance characteristics so a separate table is needed.* 565 * The table must be ordered descending by voltage: highest voltage first. 566 * @vbat2ri_charging_size: the number of items in the vbat2ri_charging 567 * table. 568 * @bti_resistance_ohm: The Battery Type Indicator (BIT) nominal resistance 569 * in ohms for this battery, if an identification resistor is mounted 570 * between a third battery terminal and ground. This scheme is used by a lot 571 * of mobile device batteries. 572 * @bti_resistance_tolerance: The tolerance in percent of the BTI resistance, 573 * for example 10 for +/- 10%, if the bti_resistance is set to 7000 and the 574 * tolerance is 10% we will detect a proper battery if the BTI resistance 575 * is between 6300 and 7700 Ohm. 576 * 577 * This is the recommended struct to manage static battery parameters, 578 * populated by power_supply_get_battery_info(). Most platform drivers should 579 * use these for consistency. 580 * 581 * Its field names must correspond to elements in enum power_supply_property. 582 * The default field value is -EINVAL or NULL for pointers. 583 * 584 * CC/CV CHARGING: 585 * 586 * The charging parameters here assume a CC/CV charging scheme. This method 587 * is most common with Lithium Ion batteries (other methods are possible) and 588 * looks as follows: 589 * 590 * ^ Battery voltage 591 * | --- overvoltage_limit_uv 592 * | 593 * | ................................................... 594 * | .. constant_charge_voltage_max_uv 595 * | .. 596 * | . 597 * | . 598 * | . 599 * | . 600 * | . 601 * | .. precharge_voltage_max_uv 602 * | .. 603 * |. (trickle charging) 604 * +------------------------------------------------------------------> time 605 * 606 * ^ Current into the battery 607 * | 608 * | ............. constant_charge_current_max_ua 609 * | . . 610 * | . . 611 * | . . 612 * | . . 613 * | . .. 614 * | . .... 615 * | . ..... 616 * | ... precharge_current_ua ....... charge_term_current_ua 617 * | . . 618 * | . . 619 * |.... tricklecharge_current_ua . 620 * | . 621 * +-----------------------------------------------------------------> time 622 * 623 * These diagrams are synchronized on time and the voltage and current 624 * follow each other. 625 * 626 * With CC/CV charging commence over time like this for an empty battery: 627 * 628 * 1. When the battery is completely empty it may need to be charged with 629 * an especially small current so that electrons just "trickle in", 630 * this is the tricklecharge_current_ua. 631 * 632 * 2. Next a small initial pre-charge current (precharge_current_ua) 633 * is applied if the voltage is below precharge_voltage_max_uv until we 634 * reach precharge_voltage_max_uv. CAUTION: in some texts this is referred 635 * to as "trickle charging" but the use in the Linux kernel is different 636 * see below! 637 * 638 * 3. Then the main charging current is applied, which is called the constant 639 * current (CC) phase. A current regulator is set up to allow 640 * constant_charge_current_max_ua of current to flow into the battery. 641 * The chemical reaction in the battery will make the voltage go up as 642 * charge goes into the battery. This current is applied until we reach 643 * the constant_charge_voltage_max_uv voltage. 644 * 645 * 4. At this voltage we switch over to the constant voltage (CV) phase. This 646 * means we allow current to go into the battery, but we keep the voltage 647 * fixed. This current will continue to charge the battery while keeping 648 * the voltage the same. A chemical reaction in the battery goes on 649 * storing energy without affecting the voltage. Over time the current 650 * will slowly drop and when we reach charge_term_current_ua we will 651 * end the constant voltage phase. 652 * 653 * After this the battery is fully charged, and if we do not support maintenance 654 * charging, the charging will not restart until power dissipation makes the 655 * voltage fall so that we reach charge_restart_voltage_uv and at this point 656 * we restart charging at the appropriate phase, usually this will be inside 657 * the CV phase. 658 * 659 * If we support maintenance charging the voltage is however kept high after 660 * the CV phase with a very low current. This is meant to let the same charge 661 * go in for usage while the charger is still connected, mainly for 662 * dissipation for the power consuming entity while connected to the 663 * charger. 664 * 665 * All charging MUST terminate if the overvoltage_limit_uv is ever reached. 666 * Overcharging Lithium Ion cells can be DANGEROUS and lead to fire or 667 * explosions. 668 * 669 * DETERMINING BATTERY CAPACITY: 670 * 671 * Several members of the struct deal with trying to determine the remaining 672 * capacity in the battery, usually as a percentage of charge. In practice 673 * many chargers uses a so-called fuel gauge or coloumb counter that measure 674 * how much charge goes into the battery and how much goes out (+/- leak 675 * consumption). This does not help if we do not know how much capacity the 676 * battery has to begin with, such as when it is first used or was taken out 677 * and charged in a separate charger. Therefore many capacity algorithms use 678 * the open circuit voltage with a look-up table to determine the rough 679 * capacity of the battery. The open circuit voltage can be conceptualized 680 * with an ideal voltage source (V) in series with an internal resistance (Ri) 681 * like this: 682 * 683 * +-------> IBAT >----------------+ 684 * | ^ | 685 * [ ] Ri | | 686 * | | VBAT | 687 * o <---------- | | 688 * +| ^ | [ ] Rload 689 * .---. | | | 690 * | V | | OCV | | 691 * '---' | | | 692 * | | | | 693 * GND +-------------------------------+ 694 * 695 * If we disconnect the load (here simplified as a fixed resistance Rload) 696 * and measure VBAT with a infinite impedance voltage meter we will get 697 * VBAT = OCV and this assumption is sometimes made even under load, assuming 698 * Rload is insignificant. However this will be of dubious quality because the 699 * load is rarely that small and Ri is strongly nonlinear depending on 700 * temperature and how much capacity is left in the battery due to the 701 * chemistry involved. 702 * 703 * In many practical applications we cannot just disconnect the battery from 704 * the load, so instead we often try to measure the instantaneous IBAT (the 705 * current out from the battery), estimate the Ri and thus calculate the 706 * voltage drop over Ri and compensate like this: 707 * 708 * OCV = VBAT - (IBAT * Ri) 709 * 710 * The tables vbat2ri_discharging and vbat2ri_charging are used to determine 711 * (by interpolation) the Ri from the VBAT under load. These curves are highly 712 * nonlinear and may need many datapoints but can be found in datasheets for 713 * some batteries. This gives the compensated open circuit voltage (OCV) for 714 * the battery even under load. Using this method will also compensate for 715 * temperature changes in the environment: this will also make the internal 716 * resistance change, and it will affect the VBAT under load, so correlating 717 * VBAT to Ri takes both remaining capacity and temperature into consideration. 718 * 719 * Alternatively a manufacturer can specify how the capacity of the battery 720 * is dependent on the battery temperature which is the main factor affecting 721 * Ri. As we know all checmical reactions are faster when it is warm and slower 722 * when it is cold. You can put in 1500mAh and only get 800mAh out before the 723 * voltage drops too low for example. This effect is also highly nonlinear and 724 * the purpose of the table resist_table: this will take a temperature and 725 * tell us how big percentage of Ri the specified temperature correlates to. 726 * Usually we have 100% of the factory_internal_resistance_uohm at 25 degrees 727 * Celsius. 728 * 729 * The power supply class itself doesn't use this struct as of now. 730 */ 731 732 struct power_supply_battery_info { 733 unsigned int technology; 734 int energy_full_design_uwh; 735 int charge_full_design_uah; 736 int voltage_min_design_uv; 737 int voltage_max_design_uv; 738 int tricklecharge_current_ua; 739 int precharge_current_ua; 740 int precharge_voltage_max_uv; 741 int charge_term_current_ua; 742 int charge_restart_voltage_uv; 743 int overvoltage_limit_uv; 744 int constant_charge_current_max_ua; 745 int constant_charge_voltage_max_uv; 746 struct power_supply_maintenance_charge_table *maintenance_charge; 747 int maintenance_charge_size; 748 int alert_low_temp_charge_current_ua; 749 int alert_low_temp_charge_voltage_uv; 750 int alert_high_temp_charge_current_ua; 751 int alert_high_temp_charge_voltage_uv; 752 int factory_internal_resistance_uohm; 753 int factory_internal_resistance_charging_uohm; 754 int ocv_temp[POWER_SUPPLY_OCV_TEMP_MAX]; 755 int temp_ambient_alert_min; 756 int temp_ambient_alert_max; 757 int temp_alert_min; 758 int temp_alert_max; 759 int temp_min; 760 int temp_max; 761 struct power_supply_battery_ocv_table *ocv_table[POWER_SUPPLY_OCV_TEMP_MAX]; 762 int ocv_table_size[POWER_SUPPLY_OCV_TEMP_MAX]; 763 struct power_supply_resistance_temp_table *resist_table; 764 int resist_table_size; 765 struct power_supply_vbat_ri_table *vbat2ri_discharging; 766 int vbat2ri_discharging_size; 767 struct power_supply_vbat_ri_table *vbat2ri_charging; 768 int vbat2ri_charging_size; 769 int bti_resistance_ohm; 770 int bti_resistance_tolerance; 771 }; 772 773 extern int power_supply_reg_notifier(struct notifier_block *nb); 774 extern void power_supply_unreg_notifier(struct notifier_block *nb); 775 #if IS_ENABLED(CONFIG_POWER_SUPPLY) 776 extern struct power_supply *power_supply_get_by_name(const char *name); 777 extern void power_supply_put(struct power_supply *psy); 778 #else 779 static inline void power_supply_put(struct power_supply *psy) {} 780 static inline struct power_supply *power_supply_get_by_name(const char *name) 781 { return NULL; } 782 #endif 783 #ifdef CONFIG_OF 784 extern struct power_supply *power_supply_get_by_phandle(struct device_node *np, 785 const char *property); 786 extern struct power_supply *devm_power_supply_get_by_phandle( 787 struct device *dev, const char *property); 788 #else /* !CONFIG_OF */ 789 static inline struct power_supply * 790 power_supply_get_by_phandle(struct device_node *np, const char *property) 791 { return NULL; } 792 static inline struct power_supply * 793 devm_power_supply_get_by_phandle(struct device *dev, const char *property) 794 { return NULL; } 795 #endif /* CONFIG_OF */ 796 797 extern const enum power_supply_property power_supply_battery_info_properties[]; 798 extern const size_t power_supply_battery_info_properties_size; 799 extern int power_supply_get_battery_info(struct power_supply *psy, 800 struct power_supply_battery_info **info_out); 801 extern void power_supply_put_battery_info(struct power_supply *psy, 802 struct power_supply_battery_info *info); 803 extern bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info, 804 enum power_supply_property psp); 805 extern int power_supply_battery_info_get_prop(struct power_supply_battery_info *info, 806 enum power_supply_property psp, 807 union power_supply_propval *val); 808 extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table, 809 int table_len, int ocv); 810 extern struct power_supply_battery_ocv_table * 811 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info, 812 int temp, int *table_len); 813 extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info, 814 int ocv, int temp); 815 extern int 816 power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table, 817 int table_len, int temp); 818 extern int power_supply_vbat2ri(struct power_supply_battery_info *info, 819 int vbat_uv, bool charging); 820 extern struct power_supply_maintenance_charge_table * 821 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info, int index); 822 extern bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info, 823 int resistance); 824 extern void power_supply_changed(struct power_supply *psy); 825 extern int power_supply_am_i_supplied(struct power_supply *psy); 826 int power_supply_get_property_from_supplier(struct power_supply *psy, 827 enum power_supply_property psp, 828 union power_supply_propval *val); 829 extern int power_supply_set_battery_charged(struct power_supply *psy); 830 831 static inline bool 832 power_supply_supports_maintenance_charging(struct power_supply_battery_info *info) 833 { 834 struct power_supply_maintenance_charge_table *mt; 835 836 mt = power_supply_get_maintenance_charging_setting(info, 0); 837 838 return (mt != NULL); 839 } 840 841 static inline bool 842 power_supply_supports_vbat2ri(struct power_supply_battery_info *info) 843 { 844 return ((info->vbat2ri_discharging != NULL) && 845 info->vbat2ri_discharging_size > 0); 846 } 847 848 static inline bool 849 power_supply_supports_temp2ri(struct power_supply_battery_info *info) 850 { 851 return ((info->resist_table != NULL) && 852 info->resist_table_size > 0); 853 } 854 855 #ifdef CONFIG_POWER_SUPPLY 856 extern int power_supply_is_system_supplied(void); 857 #else 858 static inline int power_supply_is_system_supplied(void) { return -ENOSYS; } 859 #endif 860 861 extern int power_supply_get_property(struct power_supply *psy, 862 enum power_supply_property psp, 863 union power_supply_propval *val); 864 #if IS_ENABLED(CONFIG_POWER_SUPPLY) 865 extern int power_supply_set_property(struct power_supply *psy, 866 enum power_supply_property psp, 867 const union power_supply_propval *val); 868 #else 869 static inline int power_supply_set_property(struct power_supply *psy, 870 enum power_supply_property psp, 871 const union power_supply_propval *val) 872 { return 0; } 873 #endif 874 extern int power_supply_property_is_writeable(struct power_supply *psy, 875 enum power_supply_property psp); 876 extern void power_supply_external_power_changed(struct power_supply *psy); 877 878 extern struct power_supply *__must_check 879 power_supply_register(struct device *parent, 880 const struct power_supply_desc *desc, 881 const struct power_supply_config *cfg); 882 extern struct power_supply *__must_check 883 power_supply_register_no_ws(struct device *parent, 884 const struct power_supply_desc *desc, 885 const struct power_supply_config *cfg); 886 extern struct power_supply *__must_check 887 devm_power_supply_register(struct device *parent, 888 const struct power_supply_desc *desc, 889 const struct power_supply_config *cfg); 890 extern struct power_supply *__must_check 891 devm_power_supply_register_no_ws(struct device *parent, 892 const struct power_supply_desc *desc, 893 const struct power_supply_config *cfg); 894 extern void power_supply_unregister(struct power_supply *psy); 895 extern int power_supply_powers(struct power_supply *psy, struct device *dev); 896 897 #define to_power_supply(device) container_of(device, struct power_supply, dev) 898 899 extern void *power_supply_get_drvdata(struct power_supply *psy); 900 extern int power_supply_for_each_device(void *data, int (*fn)(struct device *dev, void *data)); 901 902 static inline bool power_supply_is_amp_property(enum power_supply_property psp) 903 { 904 switch (psp) { 905 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 906 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: 907 case POWER_SUPPLY_PROP_CHARGE_FULL: 908 case POWER_SUPPLY_PROP_CHARGE_EMPTY: 909 case POWER_SUPPLY_PROP_CHARGE_NOW: 910 case POWER_SUPPLY_PROP_CHARGE_AVG: 911 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 912 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT: 913 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 914 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 915 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 916 case POWER_SUPPLY_PROP_CURRENT_MAX: 917 case POWER_SUPPLY_PROP_CURRENT_NOW: 918 case POWER_SUPPLY_PROP_CURRENT_AVG: 919 case POWER_SUPPLY_PROP_CURRENT_BOOT: 920 return true; 921 default: 922 break; 923 } 924 925 return false; 926 } 927 928 static inline bool power_supply_is_watt_property(enum power_supply_property psp) 929 { 930 switch (psp) { 931 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 932 case POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN: 933 case POWER_SUPPLY_PROP_ENERGY_FULL: 934 case POWER_SUPPLY_PROP_ENERGY_EMPTY: 935 case POWER_SUPPLY_PROP_ENERGY_NOW: 936 case POWER_SUPPLY_PROP_ENERGY_AVG: 937 case POWER_SUPPLY_PROP_VOLTAGE_MAX: 938 case POWER_SUPPLY_PROP_VOLTAGE_MIN: 939 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 940 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 941 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 942 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 943 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 944 case POWER_SUPPLY_PROP_VOLTAGE_BOOT: 945 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 946 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 947 case POWER_SUPPLY_PROP_POWER_NOW: 948 return true; 949 default: 950 break; 951 } 952 953 return false; 954 } 955 956 #ifdef CONFIG_POWER_SUPPLY_HWMON 957 int power_supply_add_hwmon_sysfs(struct power_supply *psy); 958 void power_supply_remove_hwmon_sysfs(struct power_supply *psy); 959 #else 960 static inline int power_supply_add_hwmon_sysfs(struct power_supply *psy) 961 { 962 return 0; 963 } 964 965 static inline 966 void power_supply_remove_hwmon_sysfs(struct power_supply *psy) {} 967 #endif 968 969 #ifdef CONFIG_SYSFS 970 ssize_t power_supply_charge_behaviour_show(struct device *dev, 971 unsigned int available_behaviours, 972 enum power_supply_charge_behaviour behaviour, 973 char *buf); 974 975 int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf); 976 #else 977 static inline 978 ssize_t power_supply_charge_behaviour_show(struct device *dev, 979 unsigned int available_behaviours, 980 enum power_supply_charge_behaviour behaviour, 981 char *buf) 982 { 983 return -EOPNOTSUPP; 984 } 985 986 static inline int power_supply_charge_behaviour_parse(unsigned int available_behaviours, 987 const char *buf) 988 { 989 return -EOPNOTSUPP; 990 } 991 #endif 992 993 #endif /* __LINUX_POWER_SUPPLY_H__ */ 994