582 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Battery charger driver for Dialog Semiconductor DA90304 *5 * Copyright (C) 2008 Compulab, Ltd.6 * Mike Rapoport <mike@compulab.co.il>7 */8 9#include <linux/kernel.h>10#include <linux/slab.h>11#include <linux/init.h>12#include <linux/types.h>13#include <linux/device.h>14#include <linux/workqueue.h>15#include <linux/module.h>16#include <linux/platform_device.h>17#include <linux/power_supply.h>18#include <linux/mfd/da903x.h>19 20#include <linux/debugfs.h>21#include <linux/seq_file.h>22#include <linux/notifier.h>23 24#define DA9030_FAULT_LOG 0x0a25#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)26#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)27 28#define DA9030_CHARGE_CONTROL 0x2829#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)30 31#define DA9030_ADC_MAN_CONTROL 0x3032#define DA9030_ADC_TBATREF_ENABLE (1 << 5)33#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)34 35#define DA9030_ADC_AUTO_CONTROL 0x3136#define DA9030_ADC_TBAT_ENABLE (1 << 5)37#define DA9030_ADC_VBAT_IN_TXON (1 << 4)38#define DA9030_ADC_VCH_ENABLE (1 << 3)39#define DA9030_ADC_ICH_ENABLE (1 << 2)40#define DA9030_ADC_VBAT_ENABLE (1 << 1)41#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)42 43#define DA9030_VBATMON 0x3244#define DA9030_VBATMONTXON 0x3345#define DA9030_TBATHIGHP 0x3446#define DA9030_TBATHIGHN 0x3547#define DA9030_TBATLOW 0x3648 49#define DA9030_VBAT_RES 0x4150#define DA9030_VBATMIN_RES 0x4251#define DA9030_VBATMINTXON_RES 0x4352#define DA9030_ICHMAX_RES 0x4453#define DA9030_ICHMIN_RES 0x4554#define DA9030_ICHAVERAGE_RES 0x4655#define DA9030_VCHMAX_RES 0x4756#define DA9030_VCHMIN_RES 0x4857#define DA9030_TBAT_RES 0x4958 59struct da9030_adc_res {60 uint8_t vbat_res;61 uint8_t vbatmin_res;62 uint8_t vbatmintxon;63 uint8_t ichmax_res;64 uint8_t ichmin_res;65 uint8_t ichaverage_res;66 uint8_t vchmax_res;67 uint8_t vchmin_res;68 uint8_t tbat_res;69 uint8_t adc_in4_res;70 uint8_t adc_in5_res;71};72 73struct da9030_battery_thresholds {74 int tbat_low;75 int tbat_high;76 int tbat_restart;77 78 int vbat_low;79 int vbat_crit;80 int vbat_charge_start;81 int vbat_charge_stop;82 int vbat_charge_restart;83 84 int vcharge_min;85 int vcharge_max;86};87 88struct da9030_charger {89 struct power_supply *psy;90 struct power_supply_desc psy_desc;91 92 struct device *master;93 94 struct da9030_adc_res adc;95 struct delayed_work work;96 unsigned int interval;97 98 struct power_supply_info *battery_info;99 100 struct da9030_battery_thresholds thresholds;101 102 unsigned int charge_milliamp;103 unsigned int charge_millivolt;104 105 /* charger status */106 bool chdet;107 uint8_t fault;108 int mA;109 int mV;110 bool is_on;111 112 struct notifier_block nb;113 114 /* platform callbacks for battery low and critical events */115 void (*battery_low)(void);116 void (*battery_critical)(void);117 118 struct dentry *debug_file;119};120 121static inline int da9030_reg_to_mV(int reg)122{123 return ((reg * 2650) >> 8) + 2650;124}125 126static inline int da9030_millivolt_to_reg(int mV)127{128 return ((mV - 2650) << 8) / 2650;129}130 131static inline int da9030_reg_to_mA(int reg)132{133 return ((reg * 24000) >> 8) / 15;134}135 136#ifdef CONFIG_DEBUG_FS137static int bat_debug_show(struct seq_file *s, void *data)138{139 struct da9030_charger *charger = s->private;140 141 seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");142 if (charger->chdet) {143 seq_printf(s, "iset = %dmA, vset = %dmV\n",144 charger->mA, charger->mV);145 }146 147 seq_printf(s, "vbat_res = %d (%dmV)\n",148 charger->adc.vbat_res,149 da9030_reg_to_mV(charger->adc.vbat_res));150 seq_printf(s, "vbatmin_res = %d (%dmV)\n",151 charger->adc.vbatmin_res,152 da9030_reg_to_mV(charger->adc.vbatmin_res));153 seq_printf(s, "vbatmintxon = %d (%dmV)\n",154 charger->adc.vbatmintxon,155 da9030_reg_to_mV(charger->adc.vbatmintxon));156 seq_printf(s, "ichmax_res = %d (%dmA)\n",157 charger->adc.ichmax_res,158 da9030_reg_to_mV(charger->adc.ichmax_res));159 seq_printf(s, "ichmin_res = %d (%dmA)\n",160 charger->adc.ichmin_res,161 da9030_reg_to_mA(charger->adc.ichmin_res));162 seq_printf(s, "ichaverage_res = %d (%dmA)\n",163 charger->adc.ichaverage_res,164 da9030_reg_to_mA(charger->adc.ichaverage_res));165 seq_printf(s, "vchmax_res = %d (%dmV)\n",166 charger->adc.vchmax_res,167 da9030_reg_to_mA(charger->adc.vchmax_res));168 seq_printf(s, "vchmin_res = %d (%dmV)\n",169 charger->adc.vchmin_res,170 da9030_reg_to_mV(charger->adc.vchmin_res));171 172 return 0;173}174 175DEFINE_SHOW_ATTRIBUTE(bat_debug);176 177static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)178{179 charger->debug_file = debugfs_create_file("charger", 0666, NULL,180 charger, &bat_debug_fops);181 return charger->debug_file;182}183 184static void da9030_bat_remove_debugfs(struct da9030_charger *charger)185{186 debugfs_remove(charger->debug_file);187}188#else189static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)190{191 return NULL;192}193static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)194{195}196#endif197 198static inline void da9030_read_adc(struct da9030_charger *charger,199 struct da9030_adc_res *adc)200{201 da903x_reads(charger->master, DA9030_VBAT_RES,202 sizeof(*adc), (uint8_t *)adc);203}204 205static void da9030_charger_update_state(struct da9030_charger *charger)206{207 uint8_t val;208 209 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);210 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;211 charger->mA = ((val >> 3) & 0xf) * 100;212 charger->mV = (val & 0x7) * 50 + 4000;213 214 da9030_read_adc(charger, &charger->adc);215 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);216 charger->chdet = da903x_query_status(charger->master,217 DA9030_STATUS_CHDET);218}219 220static void da9030_set_charge(struct da9030_charger *charger, int on)221{222 uint8_t val;223 224 if (on) {225 val = DA9030_CHRG_CHARGER_ENABLE;226 val |= (charger->charge_milliamp / 100) << 3;227 val |= (charger->charge_millivolt - 4000) / 50;228 charger->is_on = 1;229 } else {230 val = 0;231 charger->is_on = 0;232 }233 234 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);235 236 power_supply_changed(charger->psy);237}238 239static void da9030_charger_check_state(struct da9030_charger *charger)240{241 da9030_charger_update_state(charger);242 243 /* we wake or boot with external power on */244 if (!charger->is_on) {245 if ((charger->chdet) &&246 (charger->adc.vbat_res <247 charger->thresholds.vbat_charge_start)) {248 da9030_set_charge(charger, 1);249 }250 } else {251 /* Charger has been pulled out */252 if (!charger->chdet) {253 da9030_set_charge(charger, 0);254 return;255 }256 257 if (charger->adc.vbat_res >=258 charger->thresholds.vbat_charge_stop) {259 da9030_set_charge(charger, 0);260 da903x_write(charger->master, DA9030_VBATMON,261 charger->thresholds.vbat_charge_restart);262 } else if (charger->adc.vbat_res >263 charger->thresholds.vbat_low) {264 /* we are charging and passed LOW_THRESH,265 so upate DA9030 VBAT threshold266 */267 da903x_write(charger->master, DA9030_VBATMON,268 charger->thresholds.vbat_low);269 }270 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||271 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||272 /* Tempreture readings are negative */273 charger->adc.tbat_res < charger->thresholds.tbat_high ||274 charger->adc.tbat_res > charger->thresholds.tbat_low) {275 /* disable charger */276 da9030_set_charge(charger, 0);277 }278 }279}280 281static void da9030_charging_monitor(struct work_struct *work)282{283 struct da9030_charger *charger;284 285 charger = container_of(work, struct da9030_charger, work.work);286 287 da9030_charger_check_state(charger);288 289 /* reschedule for the next time */290 schedule_delayed_work(&charger->work, charger->interval);291}292 293static enum power_supply_property da9030_battery_props[] = {294 POWER_SUPPLY_PROP_MODEL_NAME,295 POWER_SUPPLY_PROP_STATUS,296 POWER_SUPPLY_PROP_HEALTH,297 POWER_SUPPLY_PROP_TECHNOLOGY,298 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,299 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,300 POWER_SUPPLY_PROP_VOLTAGE_NOW,301 POWER_SUPPLY_PROP_CURRENT_AVG,302};303 304static void da9030_battery_check_status(struct da9030_charger *charger,305 union power_supply_propval *val)306{307 if (charger->chdet) {308 if (charger->is_on)309 val->intval = POWER_SUPPLY_STATUS_CHARGING;310 else311 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;312 } else {313 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;314 }315}316 317static void da9030_battery_check_health(struct da9030_charger *charger,318 union power_supply_propval *val)319{320 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)321 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;322 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)323 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;324 else325 val->intval = POWER_SUPPLY_HEALTH_GOOD;326}327 328static int da9030_battery_get_property(struct power_supply *psy,329 enum power_supply_property psp,330 union power_supply_propval *val)331{332 struct da9030_charger *charger = power_supply_get_drvdata(psy);333 334 switch (psp) {335 case POWER_SUPPLY_PROP_STATUS:336 da9030_battery_check_status(charger, val);337 break;338 case POWER_SUPPLY_PROP_HEALTH:339 da9030_battery_check_health(charger, val);340 break;341 case POWER_SUPPLY_PROP_TECHNOLOGY:342 val->intval = charger->battery_info->technology;343 break;344 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:345 val->intval = charger->battery_info->voltage_max_design;346 break;347 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:348 val->intval = charger->battery_info->voltage_min_design;349 break;350 case POWER_SUPPLY_PROP_VOLTAGE_NOW:351 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;352 break;353 case POWER_SUPPLY_PROP_CURRENT_AVG:354 val->intval =355 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;356 break;357 case POWER_SUPPLY_PROP_MODEL_NAME:358 val->strval = charger->battery_info->name;359 break;360 default:361 break;362 }363 364 return 0;365}366 367static void da9030_battery_vbat_event(struct da9030_charger *charger)368{369 da9030_read_adc(charger, &charger->adc);370 371 if (charger->is_on)372 return;373 374 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {375 /* set VBAT threshold for critical */376 da903x_write(charger->master, DA9030_VBATMON,377 charger->thresholds.vbat_crit);378 if (charger->battery_low)379 charger->battery_low();380 } else if (charger->adc.vbat_res <381 charger->thresholds.vbat_crit) {382 /* notify the system of battery critical */383 if (charger->battery_critical)384 charger->battery_critical();385 }386}387 388static int da9030_battery_event(struct notifier_block *nb, unsigned long event,389 void *data)390{391 struct da9030_charger *charger =392 container_of(nb, struct da9030_charger, nb);393 394 switch (event) {395 case DA9030_EVENT_CHDET:396 cancel_delayed_work_sync(&charger->work);397 schedule_work(&charger->work.work);398 break;399 case DA9030_EVENT_VBATMON:400 da9030_battery_vbat_event(charger);401 break;402 case DA9030_EVENT_CHIOVER:403 case DA9030_EVENT_TBAT:404 da9030_set_charge(charger, 0);405 break;406 }407 408 return 0;409}410 411static void da9030_battery_convert_thresholds(struct da9030_charger *charger,412 struct da9030_battery_info *pdata)413{414 charger->thresholds.tbat_low = pdata->tbat_low;415 charger->thresholds.tbat_high = pdata->tbat_high;416 charger->thresholds.tbat_restart = pdata->tbat_restart;417 418 charger->thresholds.vbat_low =419 da9030_millivolt_to_reg(pdata->vbat_low);420 charger->thresholds.vbat_crit =421 da9030_millivolt_to_reg(pdata->vbat_crit);422 charger->thresholds.vbat_charge_start =423 da9030_millivolt_to_reg(pdata->vbat_charge_start);424 charger->thresholds.vbat_charge_stop =425 da9030_millivolt_to_reg(pdata->vbat_charge_stop);426 charger->thresholds.vbat_charge_restart =427 da9030_millivolt_to_reg(pdata->vbat_charge_restart);428 429 charger->thresholds.vcharge_min =430 da9030_millivolt_to_reg(pdata->vcharge_min);431 charger->thresholds.vcharge_max =432 da9030_millivolt_to_reg(pdata->vcharge_max);433}434 435static void da9030_battery_setup_psy(struct da9030_charger *charger)436{437 struct power_supply_desc *psy_desc = &charger->psy_desc;438 struct power_supply_info *info = charger->battery_info;439 440 psy_desc->name = info->name;441 psy_desc->use_for_apm = info->use_for_apm;442 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;443 psy_desc->get_property = da9030_battery_get_property;444 445 psy_desc->properties = da9030_battery_props;446 psy_desc->num_properties = ARRAY_SIZE(da9030_battery_props);447};448 449static int da9030_battery_charger_init(struct da9030_charger *charger)450{451 char v[5];452 int ret;453 454 v[0] = v[1] = charger->thresholds.vbat_low;455 v[2] = charger->thresholds.tbat_high;456 v[3] = charger->thresholds.tbat_restart;457 v[4] = charger->thresholds.tbat_low;458 459 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);460 if (ret)461 return ret;462 463 /*464 * Enable reference voltage supply for ADC from the LDO_INTERNAL465 * regulator. Must be set before ADC measurements can be made.466 */467 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,468 DA9030_ADC_LDO_INT_ENABLE |469 DA9030_ADC_TBATREF_ENABLE);470 if (ret)471 return ret;472 473 /* enable auto ADC measuremnts */474 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,475 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |476 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |477 DA9030_ADC_VBAT_ENABLE |478 DA9030_ADC_AUTO_SLEEP_ENABLE);479}480 481static int da9030_battery_probe(struct platform_device *pdev)482{483 struct da9030_charger *charger;484 struct power_supply_config psy_cfg = {};485 struct da9030_battery_info *pdata = pdev->dev.platform_data;486 int ret;487 488 if (pdata == NULL)489 return -EINVAL;490 491 if (pdata->charge_milliamp >= 1500 ||492 pdata->charge_millivolt < 4000 ||493 pdata->charge_millivolt > 4350)494 return -EINVAL;495 496 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);497 if (charger == NULL)498 return -ENOMEM;499 500 charger->master = pdev->dev.parent;501 502 /* 10 seconds between monitor runs unless platform defines other503 interval */504 charger->interval = msecs_to_jiffies(505 (pdata->batmon_interval ? : 10) * 1000);506 507 charger->charge_milliamp = pdata->charge_milliamp;508 charger->charge_millivolt = pdata->charge_millivolt;509 charger->battery_info = pdata->battery_info;510 charger->battery_low = pdata->battery_low;511 charger->battery_critical = pdata->battery_critical;512 513 da9030_battery_convert_thresholds(charger, pdata);514 515 ret = da9030_battery_charger_init(charger);516 if (ret)517 goto err_charger_init;518 519 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);520 schedule_delayed_work(&charger->work, charger->interval);521 522 charger->nb.notifier_call = da9030_battery_event;523 ret = da903x_register_notifier(charger->master, &charger->nb,524 DA9030_EVENT_CHDET |525 DA9030_EVENT_VBATMON |526 DA9030_EVENT_CHIOVER |527 DA9030_EVENT_TBAT);528 if (ret)529 goto err_notifier;530 531 da9030_battery_setup_psy(charger);532 psy_cfg.drv_data = charger;533 charger->psy = devm_power_supply_register(&pdev->dev,534 &charger->psy_desc,535 &psy_cfg);536 if (IS_ERR(charger->psy)) {537 ret = PTR_ERR(charger->psy);538 goto err_ps_register;539 }540 541 charger->debug_file = da9030_bat_create_debugfs(charger);542 platform_set_drvdata(pdev, charger);543 return 0;544 545err_ps_register:546 da903x_unregister_notifier(charger->master, &charger->nb,547 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |548 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);549err_notifier:550 cancel_delayed_work(&charger->work);551 552err_charger_init:553 return ret;554}555 556static void da9030_battery_remove(struct platform_device *dev)557{558 struct da9030_charger *charger = platform_get_drvdata(dev);559 560 da9030_bat_remove_debugfs(charger);561 562 da903x_unregister_notifier(charger->master, &charger->nb,563 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |564 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);565 cancel_delayed_work_sync(&charger->work);566 da9030_set_charge(charger, 0);567}568 569static struct platform_driver da903x_battery_driver = {570 .driver = {571 .name = "da903x-battery",572 },573 .probe = da9030_battery_probe,574 .remove_new = da9030_battery_remove,575};576 577module_platform_driver(da903x_battery_driver);578 579MODULE_DESCRIPTION("DA9030 battery charger driver");580MODULE_AUTHOR("Mike Rapoport, CompuLab");581MODULE_LICENSE("GPL");582