linux/drivers/power/da9030_battery.c
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   1/*
   2 * Battery charger driver for Dialog Semiconductor DA9030
   3 *
   4 * Copyright (C) 2008 Compulab, Ltd.
   5 *      Mike Rapoport <mike@compulab.co.il>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/slab.h>
  14#include <linux/init.h>
  15#include <linux/types.h>
  16#include <linux/device.h>
  17#include <linux/workqueue.h>
  18#include <linux/module.h>
  19#include <linux/platform_device.h>
  20#include <linux/power_supply.h>
  21#include <linux/mfd/da903x.h>
  22
  23#include <linux/debugfs.h>
  24#include <linux/seq_file.h>
  25#include <linux/notifier.h>
  26
  27#define DA9030_FAULT_LOG                0x0a
  28#define DA9030_FAULT_LOG_OVER_TEMP      (1 << 7)
  29#define DA9030_FAULT_LOG_VBAT_OVER      (1 << 4)
  30
  31#define DA9030_CHARGE_CONTROL           0x28
  32#define DA9030_CHRG_CHARGER_ENABLE      (1 << 7)
  33
  34#define DA9030_ADC_MAN_CONTROL          0x30
  35#define DA9030_ADC_TBATREF_ENABLE       (1 << 5)
  36#define DA9030_ADC_LDO_INT_ENABLE       (1 << 4)
  37
  38#define DA9030_ADC_AUTO_CONTROL         0x31
  39#define DA9030_ADC_TBAT_ENABLE          (1 << 5)
  40#define DA9030_ADC_VBAT_IN_TXON         (1 << 4)
  41#define DA9030_ADC_VCH_ENABLE           (1 << 3)
  42#define DA9030_ADC_ICH_ENABLE           (1 << 2)
  43#define DA9030_ADC_VBAT_ENABLE          (1 << 1)
  44#define DA9030_ADC_AUTO_SLEEP_ENABLE    (1 << 0)
  45
  46#define DA9030_VBATMON          0x32
  47#define DA9030_VBATMONTXON      0x33
  48#define DA9030_TBATHIGHP        0x34
  49#define DA9030_TBATHIGHN        0x35
  50#define DA9030_TBATLOW          0x36
  51
  52#define DA9030_VBAT_RES         0x41
  53#define DA9030_VBATMIN_RES      0x42
  54#define DA9030_VBATMINTXON_RES  0x43
  55#define DA9030_ICHMAX_RES       0x44
  56#define DA9030_ICHMIN_RES       0x45
  57#define DA9030_ICHAVERAGE_RES   0x46
  58#define DA9030_VCHMAX_RES       0x47
  59#define DA9030_VCHMIN_RES       0x48
  60#define DA9030_TBAT_RES         0x49
  61
  62struct da9030_adc_res {
  63        uint8_t vbat_res;
  64        uint8_t vbatmin_res;
  65        uint8_t vbatmintxon;
  66        uint8_t ichmax_res;
  67        uint8_t ichmin_res;
  68        uint8_t ichaverage_res;
  69        uint8_t vchmax_res;
  70        uint8_t vchmin_res;
  71        uint8_t tbat_res;
  72        uint8_t adc_in4_res;
  73        uint8_t adc_in5_res;
  74};
  75
  76struct da9030_battery_thresholds {
  77        int tbat_low;
  78        int tbat_high;
  79        int tbat_restart;
  80
  81        int vbat_low;
  82        int vbat_crit;
  83        int vbat_charge_start;
  84        int vbat_charge_stop;
  85        int vbat_charge_restart;
  86
  87        int vcharge_min;
  88        int vcharge_max;
  89};
  90
  91struct da9030_charger {
  92        struct power_supply psy;
  93
  94        struct device *master;
  95
  96        struct da9030_adc_res adc;
  97        struct delayed_work work;
  98        unsigned int interval;
  99
 100        struct power_supply_info *battery_info;
 101
 102        struct da9030_battery_thresholds thresholds;
 103
 104        unsigned int charge_milliamp;
 105        unsigned int charge_millivolt;
 106
 107        /* charger status */
 108        bool chdet;
 109        uint8_t fault;
 110        int mA;
 111        int mV;
 112        bool is_on;
 113
 114        struct notifier_block nb;
 115
 116        /* platform callbacks for battery low and critical events */
 117        void (*battery_low)(void);
 118        void (*battery_critical)(void);
 119
 120        struct dentry *debug_file;
 121};
 122
 123static inline int da9030_reg_to_mV(int reg)
 124{
 125        return ((reg * 2650) >> 8) + 2650;
 126}
 127
 128static inline int da9030_millivolt_to_reg(int mV)
 129{
 130        return ((mV - 2650) << 8) / 2650;
 131}
 132
 133static inline int da9030_reg_to_mA(int reg)
 134{
 135        return ((reg * 24000) >> 8) / 15;
 136}
 137
 138#ifdef CONFIG_DEBUG_FS
 139static int bat_debug_show(struct seq_file *s, void *data)
 140{
 141        struct da9030_charger *charger = s->private;
 142
 143        seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
 144        if (charger->chdet) {
 145                seq_printf(s, "iset = %dmA, vset = %dmV\n",
 146                           charger->mA, charger->mV);
 147        }
 148
 149        seq_printf(s, "vbat_res = %d (%dmV)\n",
 150                   charger->adc.vbat_res,
 151                   da9030_reg_to_mV(charger->adc.vbat_res));
 152        seq_printf(s, "vbatmin_res = %d (%dmV)\n",
 153                   charger->adc.vbatmin_res,
 154                   da9030_reg_to_mV(charger->adc.vbatmin_res));
 155        seq_printf(s, "vbatmintxon = %d (%dmV)\n",
 156                   charger->adc.vbatmintxon,
 157                   da9030_reg_to_mV(charger->adc.vbatmintxon));
 158        seq_printf(s, "ichmax_res = %d (%dmA)\n",
 159                   charger->adc.ichmax_res,
 160                   da9030_reg_to_mV(charger->adc.ichmax_res));
 161        seq_printf(s, "ichmin_res = %d (%dmA)\n",
 162                   charger->adc.ichmin_res,
 163                   da9030_reg_to_mA(charger->adc.ichmin_res));
 164        seq_printf(s, "ichaverage_res = %d (%dmA)\n",
 165                   charger->adc.ichaverage_res,
 166                   da9030_reg_to_mA(charger->adc.ichaverage_res));
 167        seq_printf(s, "vchmax_res = %d (%dmV)\n",
 168                   charger->adc.vchmax_res,
 169                   da9030_reg_to_mA(charger->adc.vchmax_res));
 170        seq_printf(s, "vchmin_res = %d (%dmV)\n",
 171                   charger->adc.vchmin_res,
 172                   da9030_reg_to_mV(charger->adc.vchmin_res));
 173
 174        return 0;
 175}
 176
 177static int debug_open(struct inode *inode, struct file *file)
 178{
 179        return single_open(file, bat_debug_show, inode->i_private);
 180}
 181
 182static const struct file_operations bat_debug_fops = {
 183        .open           = debug_open,
 184        .read           = seq_read,
 185        .llseek         = seq_lseek,
 186        .release        = single_release,
 187};
 188
 189static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 190{
 191        charger->debug_file = debugfs_create_file("charger", 0666, NULL,
 192                                                  charger, &bat_debug_fops);
 193        return charger->debug_file;
 194}
 195
 196static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 197{
 198        debugfs_remove(charger->debug_file);
 199}
 200#else
 201static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 202{
 203        return NULL;
 204}
 205static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 206{
 207}
 208#endif
 209
 210static inline void da9030_read_adc(struct da9030_charger *charger,
 211                                   struct da9030_adc_res *adc)
 212{
 213        da903x_reads(charger->master, DA9030_VBAT_RES,
 214                     sizeof(*adc), (uint8_t *)adc);
 215}
 216
 217static void da9030_charger_update_state(struct da9030_charger *charger)
 218{
 219        uint8_t val;
 220
 221        da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
 222        charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
 223        charger->mA = ((val >> 3) & 0xf) * 100;
 224        charger->mV = (val & 0x7) * 50 + 4000;
 225
 226        da9030_read_adc(charger, &charger->adc);
 227        da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
 228        charger->chdet = da903x_query_status(charger->master,
 229                                                     DA9030_STATUS_CHDET);
 230}
 231
 232static void da9030_set_charge(struct da9030_charger *charger, int on)
 233{
 234        uint8_t val;
 235
 236        if (on) {
 237                val = DA9030_CHRG_CHARGER_ENABLE;
 238                val |= (charger->charge_milliamp / 100) << 3;
 239                val |= (charger->charge_millivolt - 4000) / 50;
 240                charger->is_on = 1;
 241        } else {
 242                val = 0;
 243                charger->is_on = 0;
 244        }
 245
 246        da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
 247
 248        power_supply_changed(&charger->psy);
 249}
 250
 251static void da9030_charger_check_state(struct da9030_charger *charger)
 252{
 253        da9030_charger_update_state(charger);
 254
 255        /* we wake or boot with external power on */
 256        if (!charger->is_on) {
 257                if ((charger->chdet) &&
 258                    (charger->adc.vbat_res <
 259                     charger->thresholds.vbat_charge_start)) {
 260                        da9030_set_charge(charger, 1);
 261                }
 262        } else {
 263                /* Charger has been pulled out */
 264                if (!charger->chdet) {
 265                        da9030_set_charge(charger, 0);
 266                        return;
 267                }
 268
 269                if (charger->adc.vbat_res >=
 270                    charger->thresholds.vbat_charge_stop) {
 271                        da9030_set_charge(charger, 0);
 272                        da903x_write(charger->master, DA9030_VBATMON,
 273                                       charger->thresholds.vbat_charge_restart);
 274                } else if (charger->adc.vbat_res >
 275                           charger->thresholds.vbat_low) {
 276                        /* we are charging and passed LOW_THRESH,
 277                           so upate DA9030 VBAT threshold
 278                         */
 279                        da903x_write(charger->master, DA9030_VBATMON,
 280                                     charger->thresholds.vbat_low);
 281                }
 282                if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
 283                    charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
 284                    /* Tempreture readings are negative */
 285                    charger->adc.tbat_res < charger->thresholds.tbat_high ||
 286                    charger->adc.tbat_res > charger->thresholds.tbat_low) {
 287                        /* disable charger */
 288                        da9030_set_charge(charger, 0);
 289                }
 290        }
 291}
 292
 293static void da9030_charging_monitor(struct work_struct *work)
 294{
 295        struct da9030_charger *charger;
 296
 297        charger = container_of(work, struct da9030_charger, work.work);
 298
 299        da9030_charger_check_state(charger);
 300
 301        /* reschedule for the next time */
 302        schedule_delayed_work(&charger->work, charger->interval);
 303}
 304
 305static enum power_supply_property da9030_battery_props[] = {
 306        POWER_SUPPLY_PROP_MODEL_NAME,
 307        POWER_SUPPLY_PROP_STATUS,
 308        POWER_SUPPLY_PROP_HEALTH,
 309        POWER_SUPPLY_PROP_TECHNOLOGY,
 310        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 311        POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 312        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 313        POWER_SUPPLY_PROP_CURRENT_AVG,
 314};
 315
 316static void da9030_battery_check_status(struct da9030_charger *charger,
 317                                    union power_supply_propval *val)
 318{
 319        if (charger->chdet) {
 320                if (charger->is_on)
 321                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
 322                else
 323                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 324        } else {
 325                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 326        }
 327}
 328
 329static void da9030_battery_check_health(struct da9030_charger *charger,
 330                                    union power_supply_propval *val)
 331{
 332        if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
 333                val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 334        else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
 335                val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 336        else
 337                val->intval = POWER_SUPPLY_HEALTH_GOOD;
 338}
 339
 340static int da9030_battery_get_property(struct power_supply *psy,
 341                                   enum power_supply_property psp,
 342                                   union power_supply_propval *val)
 343{
 344        struct da9030_charger *charger;
 345        charger = container_of(psy, struct da9030_charger, psy);
 346
 347        switch (psp) {
 348        case POWER_SUPPLY_PROP_STATUS:
 349                da9030_battery_check_status(charger, val);
 350                break;
 351        case POWER_SUPPLY_PROP_HEALTH:
 352                da9030_battery_check_health(charger, val);
 353                break;
 354        case POWER_SUPPLY_PROP_TECHNOLOGY:
 355                val->intval = charger->battery_info->technology;
 356                break;
 357        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 358                val->intval = charger->battery_info->voltage_max_design;
 359                break;
 360        case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 361                val->intval = charger->battery_info->voltage_min_design;
 362                break;
 363        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 364                val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
 365                break;
 366        case POWER_SUPPLY_PROP_CURRENT_AVG:
 367                val->intval =
 368                        da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
 369                break;
 370        case POWER_SUPPLY_PROP_MODEL_NAME:
 371                val->strval = charger->battery_info->name;
 372                break;
 373        default:
 374                break;
 375        }
 376
 377        return 0;
 378}
 379
 380static void da9030_battery_vbat_event(struct da9030_charger *charger)
 381{
 382        da9030_read_adc(charger, &charger->adc);
 383
 384        if (charger->is_on)
 385                return;
 386
 387        if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
 388                /* set VBAT threshold for critical */
 389                da903x_write(charger->master, DA9030_VBATMON,
 390                             charger->thresholds.vbat_crit);
 391                if (charger->battery_low)
 392                        charger->battery_low();
 393        } else if (charger->adc.vbat_res <
 394                   charger->thresholds.vbat_crit) {
 395                /* notify the system of battery critical */
 396                if (charger->battery_critical)
 397                        charger->battery_critical();
 398        }
 399}
 400
 401static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
 402                                void *data)
 403{
 404        struct da9030_charger *charger =
 405                container_of(nb, struct da9030_charger, nb);
 406
 407        switch (event) {
 408        case DA9030_EVENT_CHDET:
 409                cancel_delayed_work_sync(&charger->work);
 410                schedule_work(&charger->work.work);
 411                break;
 412        case DA9030_EVENT_VBATMON:
 413                da9030_battery_vbat_event(charger);
 414                break;
 415        case DA9030_EVENT_CHIOVER:
 416        case DA9030_EVENT_TBAT:
 417                da9030_set_charge(charger, 0);
 418                break;
 419        }
 420
 421        return 0;
 422}
 423
 424static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
 425                                              struct da9030_battery_info *pdata)
 426{
 427        charger->thresholds.tbat_low = pdata->tbat_low;
 428        charger->thresholds.tbat_high = pdata->tbat_high;
 429        charger->thresholds.tbat_restart  = pdata->tbat_restart;
 430
 431        charger->thresholds.vbat_low =
 432                da9030_millivolt_to_reg(pdata->vbat_low);
 433        charger->thresholds.vbat_crit =
 434                da9030_millivolt_to_reg(pdata->vbat_crit);
 435        charger->thresholds.vbat_charge_start =
 436                da9030_millivolt_to_reg(pdata->vbat_charge_start);
 437        charger->thresholds.vbat_charge_stop =
 438                da9030_millivolt_to_reg(pdata->vbat_charge_stop);
 439        charger->thresholds.vbat_charge_restart =
 440                da9030_millivolt_to_reg(pdata->vbat_charge_restart);
 441
 442        charger->thresholds.vcharge_min =
 443                da9030_millivolt_to_reg(pdata->vcharge_min);
 444        charger->thresholds.vcharge_max =
 445                da9030_millivolt_to_reg(pdata->vcharge_max);
 446}
 447
 448static void da9030_battery_setup_psy(struct da9030_charger *charger)
 449{
 450        struct power_supply *psy = &charger->psy;
 451        struct power_supply_info *info = charger->battery_info;
 452
 453        psy->name = info->name;
 454        psy->use_for_apm = info->use_for_apm;
 455        psy->type = POWER_SUPPLY_TYPE_BATTERY;
 456        psy->get_property = da9030_battery_get_property;
 457
 458        psy->properties = da9030_battery_props;
 459        psy->num_properties = ARRAY_SIZE(da9030_battery_props);
 460};
 461
 462static int da9030_battery_charger_init(struct da9030_charger *charger)
 463{
 464        char v[5];
 465        int ret;
 466
 467        v[0] = v[1] = charger->thresholds.vbat_low;
 468        v[2] = charger->thresholds.tbat_high;
 469        v[3] = charger->thresholds.tbat_restart;
 470        v[4] = charger->thresholds.tbat_low;
 471
 472        ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
 473        if (ret)
 474                return ret;
 475
 476        /*
 477         * Enable reference voltage supply for ADC from the LDO_INTERNAL
 478         * regulator. Must be set before ADC measurements can be made.
 479         */
 480        ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
 481                           DA9030_ADC_LDO_INT_ENABLE |
 482                           DA9030_ADC_TBATREF_ENABLE);
 483        if (ret)
 484                return ret;
 485
 486        /* enable auto ADC measuremnts */
 487        return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
 488                            DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
 489                            DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
 490                            DA9030_ADC_VBAT_ENABLE |
 491                            DA9030_ADC_AUTO_SLEEP_ENABLE);
 492}
 493
 494static int da9030_battery_probe(struct platform_device *pdev)
 495{
 496        struct da9030_charger *charger;
 497        struct da9030_battery_info *pdata = pdev->dev.platform_data;
 498        int ret;
 499
 500        if (pdata == NULL)
 501                return -EINVAL;
 502
 503        if (pdata->charge_milliamp >= 1500 ||
 504            pdata->charge_millivolt < 4000 ||
 505            pdata->charge_millivolt > 4350)
 506                return -EINVAL;
 507
 508        charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
 509        if (charger == NULL)
 510                return -ENOMEM;
 511
 512        charger->master = pdev->dev.parent;
 513
 514        /* 10 seconds between monitor runs unless platform defines other
 515           interval */
 516        charger->interval = msecs_to_jiffies(
 517                (pdata->batmon_interval ? : 10) * 1000);
 518
 519        charger->charge_milliamp = pdata->charge_milliamp;
 520        charger->charge_millivolt = pdata->charge_millivolt;
 521        charger->battery_info = pdata->battery_info;
 522        charger->battery_low = pdata->battery_low;
 523        charger->battery_critical = pdata->battery_critical;
 524
 525        da9030_battery_convert_thresholds(charger, pdata);
 526
 527        ret = da9030_battery_charger_init(charger);
 528        if (ret)
 529                goto err_charger_init;
 530
 531        INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
 532        schedule_delayed_work(&charger->work, charger->interval);
 533
 534        charger->nb.notifier_call = da9030_battery_event;
 535        ret = da903x_register_notifier(charger->master, &charger->nb,
 536                                       DA9030_EVENT_CHDET |
 537                                       DA9030_EVENT_VBATMON |
 538                                       DA9030_EVENT_CHIOVER |
 539                                       DA9030_EVENT_TBAT);
 540        if (ret)
 541                goto err_notifier;
 542
 543        da9030_battery_setup_psy(charger);
 544        ret = power_supply_register(&pdev->dev, &charger->psy);
 545        if (ret)
 546                goto err_ps_register;
 547
 548        charger->debug_file = da9030_bat_create_debugfs(charger);
 549        platform_set_drvdata(pdev, charger);
 550        return 0;
 551
 552err_ps_register:
 553        da903x_unregister_notifier(charger->master, &charger->nb,
 554                                   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 555                                   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 556err_notifier:
 557        cancel_delayed_work(&charger->work);
 558
 559err_charger_init:
 560        return ret;
 561}
 562
 563static int da9030_battery_remove(struct platform_device *dev)
 564{
 565        struct da9030_charger *charger = platform_get_drvdata(dev);
 566
 567        da9030_bat_remove_debugfs(charger);
 568
 569        da903x_unregister_notifier(charger->master, &charger->nb,
 570                                   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 571                                   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 572        cancel_delayed_work_sync(&charger->work);
 573        da9030_set_charge(charger, 0);
 574        power_supply_unregister(&charger->psy);
 575
 576        return 0;
 577}
 578
 579static struct platform_driver da903x_battery_driver = {
 580        .driver = {
 581                .name   = "da903x-battery",
 582                .owner  = THIS_MODULE,
 583        },
 584        .probe = da9030_battery_probe,
 585        .remove = da9030_battery_remove,
 586};
 587
 588module_platform_driver(da903x_battery_driver);
 589
 590MODULE_DESCRIPTION("DA9030 battery charger driver");
 591MODULE_AUTHOR("Mike Rapoport, CompuLab");
 592MODULE_LICENSE("GPL");
 593
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