drivers/power/supply/da9030_battery.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Battery charger driver for Dialog Semiconductor DA9030
   4  *
   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                0x0a
  25 #define DA9030_FAULT_LOG_OVER_TEMP      (1 << 7)
  26 #define DA9030_FAULT_LOG_VBAT_OVER      (1 << 4)
  27
  28 #define DA9030_CHARGE_CONTROL           0x28
  29 #define DA9030_CHRG_CHARGER_ENABLE      (1 << 7)
  30
  31 #define DA9030_ADC_MAN_CONTROL          0x30
  32 #define DA9030_ADC_TBATREF_ENABLE       (1 << 5)
  33 #define DA9030_ADC_LDO_INT_ENABLE       (1 << 4)
  34
  35 #define DA9030_ADC_AUTO_CONTROL         0x31
  36 #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          0x32
  44 #define DA9030_VBATMONTXON      0x33
  45 #define DA9030_TBATHIGHP        0x34
  46 #define DA9030_TBATHIGHN        0x35
  47 #define DA9030_TBATLOW          0x36
  48
  49 #define DA9030_VBAT_RES         0x41
  50 #define DA9030_VBATMIN_RES      0x42
  51 #define DA9030_VBATMINTXON_RES  0x43
  52 #define DA9030_ICHMAX_RES       0x44
  53 #define DA9030_ICHMIN_RES       0x45
  54 #define DA9030_ICHAVERAGE_RES   0x46
  55 #define DA9030_VCHMAX_RES       0x47
  56 #define DA9030_VCHMIN_RES       0x48
  57 #define DA9030_TBAT_RES         0x49
  58
  59 struct 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
  73 struct 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
  88 struct 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
 121 static inline int da9030_reg_to_mV(int reg)
 122 {
 123         return ((reg * 2650) >> 8) + 2650;
 124 }
 125
 126 static inline int da9030_millivolt_to_reg(int mV)
 127 {
 128         return ((mV - 2650) << 8) / 2650;
 129 }
 130
 131 static inline int da9030_reg_to_mA(int reg)
 132 {
 133         return ((reg * 24000) >> 8) / 15;
 134 }
 135
 136 #ifdef CONFIG_DEBUG_FS
 137 static 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
 175 DEFINE_SHOW_ATTRIBUTE(bat_debug);
 176
 177 static 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
 184 static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 185 {
 186         debugfs_remove(charger->debug_file);
 187 }
 188 #else
 189 static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 190 {
 191         return NULL;
 192 }
 193 static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 194 {
 195 }
 196 #endif
 197
 198 static 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
 205 static 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
 220 static 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
 239 static 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 threshold
 266                          */
 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
 281 static 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
 293 static 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
 304 static 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                 else
 311                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 312         } else {
 313                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 314         }
 315 }
 316
 317 static 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         else
 325                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 326 }
 327
 328 static 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
 367 static 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
 388 static 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
 411 static 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
 435 static 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
 449 static 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_INTERNAL
 465          * 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
 481 static 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 other
 503            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 = power_supply_register(&pdev->dev, &charger->psy_desc,
 534                                              &psy_cfg);
 535         if (IS_ERR(charger->psy)) {
 536                 ret = PTR_ERR(charger->psy);
 537                 goto err_ps_register;
 538         }
 539
 540         charger->debug_file = da9030_bat_create_debugfs(charger);
 541         platform_set_drvdata(pdev, charger);
 542         return 0;
 543
 544 err_ps_register:
 545         da903x_unregister_notifier(charger->master, &charger->nb,
 546                                    DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 547                                    DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 548 err_notifier:
 549         cancel_delayed_work(&charger->work);
 550
 551 err_charger_init:
 552         return ret;
 553 }
 554
 555 static int da9030_battery_remove(struct platform_device *dev)
 556 {
 557         struct da9030_charger *charger = platform_get_drvdata(dev);
 558
 559         da9030_bat_remove_debugfs(charger);
 560
 561         da903x_unregister_notifier(charger->master, &charger->nb,
 562                                    DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 563                                    DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 564         cancel_delayed_work_sync(&charger->work);
 565         da9030_set_charge(charger, 0);
 566         power_supply_unregister(charger->psy);
 567
 568         return 0;
 569 }
 570
 571 static struct platform_driver da903x_battery_driver = {
 572         .driver = {
 573                 .name   = "da903x-battery",
 574         },
 575         .probe = da9030_battery_probe,
 576         .remove = da9030_battery_remove,
 577 };
 578
 579 module_platform_driver(da903x_battery_driver);
 580
 581 MODULE_DESCRIPTION("DA9030 battery charger driver");
 582 MODULE_AUTHOR("Mike Rapoport, CompuLab");
 583 MODULE_LICENSE("GPL");