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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Power supply driver for the Active-semi ACT8945A PMIC4 *5 * Copyright (C) 2015 Atmel Corporation6 *7 * Author: Wenyou Yang <wenyou.yang@atmel.com>8 */9#include <linux/interrupt.h>10#include <linux/module.h>11#include <linux/of.h>12#include <linux/of_irq.h>13#include <linux/platform_device.h>14#include <linux/power_supply.h>15#include <linux/regmap.h>16#include <linux/gpio/consumer.h>17 18static const char *act8945a_charger_model = "ACT8945A";19static const char *act8945a_charger_manufacturer = "Active-semi";20 21/*22 * ACT8945A Charger Register Map23 */24 25/* 0x70: Reserved */26#define ACT8945A_APCH_CFG 0x7127#define ACT8945A_APCH_STATUS 0x7828#define ACT8945A_APCH_CTRL 0x7929#define ACT8945A_APCH_STATE 0x7A30 31/* ACT8945A_APCH_CFG */32#define APCH_CFG_OVPSET (0x3 << 0)33#define APCH_CFG_OVPSET_6V6 (0x0 << 0)34#define APCH_CFG_OVPSET_7V (0x1 << 0)35#define APCH_CFG_OVPSET_7V5 (0x2 << 0)36#define APCH_CFG_OVPSET_8V (0x3 << 0)37#define APCH_CFG_PRETIMO (0x3 << 2)38#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)39#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)40#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)41#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)42#define APCH_CFG_TOTTIMO (0x3 << 4)43#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)44#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)45#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)46#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)47#define APCH_CFG_SUSCHG (0x1 << 7)48 49#define APCH_STATUS_CHGDAT BIT(0)50#define APCH_STATUS_INDAT BIT(1)51#define APCH_STATUS_TEMPDAT BIT(2)52#define APCH_STATUS_TIMRDAT BIT(3)53#define APCH_STATUS_CHGSTAT BIT(4)54#define APCH_STATUS_INSTAT BIT(5)55#define APCH_STATUS_TEMPSTAT BIT(6)56#define APCH_STATUS_TIMRSTAT BIT(7)57 58#define APCH_CTRL_CHGEOCOUT BIT(0)59#define APCH_CTRL_INDIS BIT(1)60#define APCH_CTRL_TEMPOUT BIT(2)61#define APCH_CTRL_TIMRPRE BIT(3)62#define APCH_CTRL_CHGEOCIN BIT(4)63#define APCH_CTRL_INCON BIT(5)64#define APCH_CTRL_TEMPIN BIT(6)65#define APCH_CTRL_TIMRTOT BIT(7)66 67#define APCH_STATE_ACINSTAT (0x1 << 1)68#define APCH_STATE_CSTATE (0x3 << 4)69#define APCH_STATE_CSTATE_SHIFT 470#define APCH_STATE_CSTATE_DISABLED 0x0071#define APCH_STATE_CSTATE_EOC 0x0172#define APCH_STATE_CSTATE_FAST 0x0273#define APCH_STATE_CSTATE_PRE 0x0374 75struct act8945a_charger {76 struct power_supply *psy;77 struct power_supply_desc desc;78 struct regmap *regmap;79 struct work_struct work;80 81 bool init_done;82 struct gpio_desc *lbo_gpio;83 struct gpio_desc *chglev_gpio;84};85 86static int act8945a_get_charger_state(struct regmap *regmap, int *val)87{88 int ret;89 unsigned int status, state;90 91 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);92 if (ret < 0)93 return ret;94 95 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);96 if (ret < 0)97 return ret;98 99 state &= APCH_STATE_CSTATE;100 state >>= APCH_STATE_CSTATE_SHIFT;101 102 switch (state) {103 case APCH_STATE_CSTATE_PRE:104 case APCH_STATE_CSTATE_FAST:105 *val = POWER_SUPPLY_STATUS_CHARGING;106 break;107 case APCH_STATE_CSTATE_EOC:108 if (status & APCH_STATUS_CHGDAT)109 *val = POWER_SUPPLY_STATUS_FULL;110 else111 *val = POWER_SUPPLY_STATUS_CHARGING;112 break;113 case APCH_STATE_CSTATE_DISABLED:114 default:115 if (!(status & APCH_STATUS_INDAT))116 *val = POWER_SUPPLY_STATUS_DISCHARGING;117 else118 *val = POWER_SUPPLY_STATUS_NOT_CHARGING;119 break;120 }121 122 return 0;123}124 125static int act8945a_get_charge_type(struct regmap *regmap, int *val)126{127 int ret;128 unsigned int status, state;129 130 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);131 if (ret < 0)132 return ret;133 134 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);135 if (ret < 0)136 return ret;137 138 state &= APCH_STATE_CSTATE;139 state >>= APCH_STATE_CSTATE_SHIFT;140 141 switch (state) {142 case APCH_STATE_CSTATE_PRE:143 *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;144 break;145 case APCH_STATE_CSTATE_FAST:146 *val = POWER_SUPPLY_CHARGE_TYPE_FAST;147 break;148 case APCH_STATE_CSTATE_EOC:149 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;150 break;151 case APCH_STATE_CSTATE_DISABLED:152 default:153 if (!(status & APCH_STATUS_INDAT))154 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;155 else156 *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;157 break;158 }159 160 return 0;161}162 163static int act8945a_get_battery_health(struct regmap *regmap, int *val)164{165 int ret;166 unsigned int status, state, config;167 168 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);169 if (ret < 0)170 return ret;171 172 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);173 if (ret < 0)174 return ret;175 176 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);177 if (ret < 0)178 return ret;179 180 state &= APCH_STATE_CSTATE;181 state >>= APCH_STATE_CSTATE_SHIFT;182 183 switch (state) {184 case APCH_STATE_CSTATE_DISABLED:185 if (config & APCH_CFG_SUSCHG) {186 *val = POWER_SUPPLY_HEALTH_UNKNOWN;187 } else if (status & APCH_STATUS_INDAT) {188 if (!(status & APCH_STATUS_TEMPDAT))189 *val = POWER_SUPPLY_HEALTH_OVERHEAT;190 else if (status & APCH_STATUS_TIMRDAT)191 *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;192 else193 *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;194 } else {195 *val = POWER_SUPPLY_HEALTH_GOOD;196 }197 break;198 case APCH_STATE_CSTATE_PRE:199 case APCH_STATE_CSTATE_FAST:200 case APCH_STATE_CSTATE_EOC:201 default:202 *val = POWER_SUPPLY_HEALTH_GOOD;203 break;204 }205 206 return 0;207}208 209static int act8945a_get_capacity_level(struct act8945a_charger *charger,210 struct regmap *regmap, int *val)211{212 int ret;213 unsigned int status, state, config;214 int lbo_level = gpiod_get_value(charger->lbo_gpio);215 216 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);217 if (ret < 0)218 return ret;219 220 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);221 if (ret < 0)222 return ret;223 224 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);225 if (ret < 0)226 return ret;227 228 state &= APCH_STATE_CSTATE;229 state >>= APCH_STATE_CSTATE_SHIFT;230 231 switch (state) {232 case APCH_STATE_CSTATE_PRE:233 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;234 break;235 case APCH_STATE_CSTATE_FAST:236 if (lbo_level)237 *val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;238 else239 *val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;240 break;241 case APCH_STATE_CSTATE_EOC:242 if (status & APCH_STATUS_CHGDAT)243 *val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;244 else245 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;246 break;247 case APCH_STATE_CSTATE_DISABLED:248 default:249 if (config & APCH_CFG_SUSCHG) {250 *val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;251 } else {252 *val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;253 if (!(status & APCH_STATUS_INDAT)) {254 if (!lbo_level)255 *val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;256 }257 }258 break;259 }260 261 return 0;262}263 264#define MAX_CURRENT_USB_HIGH 450000265#define MAX_CURRENT_USB_LOW 90000266#define MAX_CURRENT_USB_PRE 45000267/*268 * Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205269 * Riset = 2.43K270 */271#define MAX_CURRENT_AC_HIGH 886527272#define MAX_CURRENT_AC_LOW 117305273#define MAX_CURRENT_AC_HIGH_PRE 88653274#define MAX_CURRENT_AC_LOW_PRE 11731275 276static int act8945a_get_current_max(struct act8945a_charger *charger,277 struct regmap *regmap, int *val)278{279 int ret;280 unsigned int status, state;281 unsigned int acin_state;282 int chgin_level = gpiod_get_value(charger->chglev_gpio);283 284 ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);285 if (ret < 0)286 return ret;287 288 ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);289 if (ret < 0)290 return ret;291 292 acin_state = (state & APCH_STATE_ACINSTAT) >> 1;293 294 state &= APCH_STATE_CSTATE;295 state >>= APCH_STATE_CSTATE_SHIFT;296 297 switch (state) {298 case APCH_STATE_CSTATE_PRE:299 if (acin_state) {300 if (chgin_level)301 *val = MAX_CURRENT_AC_HIGH_PRE;302 else303 *val = MAX_CURRENT_AC_LOW_PRE;304 } else {305 *val = MAX_CURRENT_USB_PRE;306 }307 break;308 case APCH_STATE_CSTATE_FAST:309 if (acin_state) {310 if (chgin_level)311 *val = MAX_CURRENT_AC_HIGH;312 else313 *val = MAX_CURRENT_AC_LOW;314 } else {315 if (chgin_level)316 *val = MAX_CURRENT_USB_HIGH;317 else318 *val = MAX_CURRENT_USB_LOW;319 }320 break;321 case APCH_STATE_CSTATE_EOC:322 case APCH_STATE_CSTATE_DISABLED:323 default:324 *val = 0;325 break;326 }327 328 return 0;329}330 331static enum power_supply_property act8945a_charger_props[] = {332 POWER_SUPPLY_PROP_STATUS,333 POWER_SUPPLY_PROP_CHARGE_TYPE,334 POWER_SUPPLY_PROP_TECHNOLOGY,335 POWER_SUPPLY_PROP_HEALTH,336 POWER_SUPPLY_PROP_CAPACITY_LEVEL,337 POWER_SUPPLY_PROP_CURRENT_MAX,338 POWER_SUPPLY_PROP_MODEL_NAME,339 POWER_SUPPLY_PROP_MANUFACTURER340};341 342static int act8945a_charger_get_property(struct power_supply *psy,343 enum power_supply_property prop,344 union power_supply_propval *val)345{346 struct act8945a_charger *charger = power_supply_get_drvdata(psy);347 struct regmap *regmap = charger->regmap;348 int ret = 0;349 350 switch (prop) {351 case POWER_SUPPLY_PROP_STATUS:352 ret = act8945a_get_charger_state(regmap, &val->intval);353 break;354 case POWER_SUPPLY_PROP_CHARGE_TYPE:355 ret = act8945a_get_charge_type(regmap, &val->intval);356 break;357 case POWER_SUPPLY_PROP_TECHNOLOGY:358 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;359 break;360 case POWER_SUPPLY_PROP_HEALTH:361 ret = act8945a_get_battery_health(regmap, &val->intval);362 break;363 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:364 ret = act8945a_get_capacity_level(charger,365 regmap, &val->intval);366 break;367 case POWER_SUPPLY_PROP_CURRENT_MAX:368 ret = act8945a_get_current_max(charger,369 regmap, &val->intval);370 break;371 case POWER_SUPPLY_PROP_MODEL_NAME:372 val->strval = act8945a_charger_model;373 break;374 case POWER_SUPPLY_PROP_MANUFACTURER:375 val->strval = act8945a_charger_manufacturer;376 break;377 default:378 return -EINVAL;379 }380 381 return ret;382}383 384static int act8945a_enable_interrupt(struct act8945a_charger *charger)385{386 struct regmap *regmap = charger->regmap;387 unsigned char ctrl;388 int ret;389 390 ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |391 APCH_CTRL_INDIS | APCH_CTRL_INCON |392 APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |393 APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;394 ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);395 if (ret)396 return ret;397 398 ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |399 APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;400 ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);401 if (ret)402 return ret;403 404 return 0;405}406 407static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,408 unsigned int *type)409{410 unsigned int status, state;411 int ret;412 413 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);414 if (ret < 0)415 return ret;416 417 ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);418 if (ret < 0)419 return ret;420 421 if (status & APCH_STATUS_INDAT) {422 if (state & APCH_STATE_ACINSTAT)423 *type = POWER_SUPPLY_TYPE_MAINS;424 else425 *type = POWER_SUPPLY_TYPE_USB;426 } else {427 *type = POWER_SUPPLY_TYPE_BATTERY;428 }429 430 return 0;431}432 433static void act8945a_work(struct work_struct *work)434{435 struct act8945a_charger *charger =436 container_of(work, struct act8945a_charger, work);437 438 act8945a_set_supply_type(charger, &charger->desc.type);439 440 power_supply_changed(charger->psy);441}442 443static irqreturn_t act8945a_status_changed(int irq, void *dev_id)444{445 struct act8945a_charger *charger = dev_id;446 447 if (charger->init_done)448 schedule_work(&charger->work);449 450 return IRQ_HANDLED;451}452 453#define DEFAULT_TOTAL_TIME_OUT 3454#define DEFAULT_PRE_TIME_OUT 40455#define DEFAULT_INPUT_OVP_THRESHOLD 6600456 457static int act8945a_charger_config(struct device *dev,458 struct act8945a_charger *charger)459{460 struct device_node *np = dev->of_node;461 struct regmap *regmap = charger->regmap;462 463 u32 total_time_out;464 u32 pre_time_out;465 u32 input_voltage_threshold;466 int err, ret;467 468 unsigned int tmp;469 unsigned int value = 0;470 471 if (!np) {472 dev_err(dev, "no charger of node\n");473 return -EINVAL;474 }475 476 ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);477 if (ret)478 return ret;479 480 if (tmp & APCH_CFG_SUSCHG) {481 value |= APCH_CFG_SUSCHG;482 dev_info(dev, "have been suspended\n");483 }484 485 charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",486 GPIOD_IN);487 if (IS_ERR(charger->lbo_gpio)) {488 err = PTR_ERR(charger->lbo_gpio);489 dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);490 return err;491 }492 493 ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),494 act8945a_status_changed,495 (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),496 "act8945a_lbo_detect", charger);497 if (ret)498 dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");499 500 charger->chglev_gpio = devm_gpiod_get_optional(dev,501 "active-semi,chglev",502 GPIOD_IN);503 if (IS_ERR(charger->chglev_gpio)) {504 err = PTR_ERR(charger->chglev_gpio);505 dev_err(dev, "unable to claim gpio \"chglev\": %d\n", err);506 return err;507 }508 509 if (of_property_read_u32(np,510 "active-semi,input-voltage-threshold-microvolt",511 &input_voltage_threshold))512 input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;513 514 if (of_property_read_u32(np,515 "active-semi,precondition-timeout",516 &pre_time_out))517 pre_time_out = DEFAULT_PRE_TIME_OUT;518 519 if (of_property_read_u32(np, "active-semi,total-timeout",520 &total_time_out))521 total_time_out = DEFAULT_TOTAL_TIME_OUT;522 523 switch (input_voltage_threshold) {524 case 8000:525 value |= APCH_CFG_OVPSET_8V;526 break;527 case 7500:528 value |= APCH_CFG_OVPSET_7V5;529 break;530 case 7000:531 value |= APCH_CFG_OVPSET_7V;532 break;533 case 6600:534 default:535 value |= APCH_CFG_OVPSET_6V6;536 break;537 }538 539 switch (pre_time_out) {540 case 60:541 value |= APCH_CFG_PRETIMO_60_MIN;542 break;543 case 80:544 value |= APCH_CFG_PRETIMO_80_MIN;545 break;546 case 0:547 value |= APCH_CFG_PRETIMO_DISABLED;548 break;549 case 40:550 default:551 value |= APCH_CFG_PRETIMO_40_MIN;552 break;553 }554 555 switch (total_time_out) {556 case 4:557 value |= APCH_CFG_TOTTIMO_4_HOUR;558 break;559 case 5:560 value |= APCH_CFG_TOTTIMO_5_HOUR;561 break;562 case 0:563 value |= APCH_CFG_TOTTIMO_DISABLED;564 break;565 case 3:566 default:567 value |= APCH_CFG_TOTTIMO_3_HOUR;568 break;569 }570 571 return regmap_write(regmap, ACT8945A_APCH_CFG, value);572}573 574static int act8945a_charger_probe(struct platform_device *pdev)575{576 struct act8945a_charger *charger;577 struct power_supply_config psy_cfg = {};578 int irq, ret;579 580 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);581 if (!charger)582 return -ENOMEM;583 584 charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);585 if (!charger->regmap) {586 dev_err(&pdev->dev, "Parent did not provide regmap\n");587 return -EINVAL;588 }589 590 ret = act8945a_charger_config(&pdev->dev, charger);591 if (ret)592 return ret;593 594 irq = of_irq_get(pdev->dev.of_node, 0);595 if (irq <= 0) {596 dev_err(&pdev->dev, "failed to find IRQ number\n");597 return irq ?: -ENXIO;598 }599 600 ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,601 IRQF_TRIGGER_FALLING, "act8945a_interrupt",602 charger);603 if (ret) {604 dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");605 return ret;606 }607 608 charger->desc.name = "act8945a-charger";609 charger->desc.get_property = act8945a_charger_get_property;610 charger->desc.properties = act8945a_charger_props;611 charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);612 613 ret = act8945a_set_supply_type(charger, &charger->desc.type);614 if (ret)615 return -EINVAL;616 617 psy_cfg.of_node = pdev->dev.of_node;618 psy_cfg.drv_data = charger;619 620 charger->psy = devm_power_supply_register(&pdev->dev,621 &charger->desc,622 &psy_cfg);623 if (IS_ERR(charger->psy)) {624 dev_err(&pdev->dev, "failed to register power supply\n");625 return PTR_ERR(charger->psy);626 }627 628 platform_set_drvdata(pdev, charger);629 630 INIT_WORK(&charger->work, act8945a_work);631 632 ret = act8945a_enable_interrupt(charger);633 if (ret)634 return -EIO;635 636 charger->init_done = true;637 638 return 0;639}640 641static void act8945a_charger_remove(struct platform_device *pdev)642{643 struct act8945a_charger *charger = platform_get_drvdata(pdev);644 645 charger->init_done = false;646 cancel_work_sync(&charger->work);647}648 649static struct platform_driver act8945a_charger_driver = {650 .driver = {651 .name = "act8945a-charger",652 },653 .probe = act8945a_charger_probe,654 .remove_new = act8945a_charger_remove,655};656module_platform_driver(act8945a_charger_driver);657 658MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");659MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");660MODULE_LICENSE("GPL");661