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
  26#define DA9030_FAULT_LOG                0x0a
  27#define DA9030_FAULT_LOG_OVER_TEMP      (1 << 7)
  28#define DA9030_FAULT_LOG_VBAT_OVER      (1 << 4)
  29
  30#define DA9030_CHARGE_CONTROL           0x28
  31#define DA9030_CHRG_CHARGER_ENABLE      (1 << 7)
  32
  33#define DA9030_ADC_MAN_CONTROL          0x30
  34#define DA9030_ADC_TBATREF_ENABLE       (1 << 5)
  35#define DA9030_ADC_LDO_INT_ENABLE       (1 << 4)
  36
  37#define DA9030_ADC_AUTO_CONTROL         0x31
  38#define DA9030_ADC_TBAT_ENABLE          (1 << 5)
  39#define DA9030_ADC_VBAT_IN_TXON         (1 << 4)
  40#define DA9030_ADC_VCH_ENABLE           (1 << 3)
  41#define DA9030_ADC_ICH_ENABLE           (1 << 2)
  42#define DA9030_ADC_VBAT_ENABLE          (1 << 1)
  43#define DA9030_ADC_AUTO_SLEEP_ENABLE    (1 << 0)
  44
  45#define DA9030_VBATMON          0x32
  46#define DA9030_VBATMONTXON      0x33
  47#define DA9030_TBATHIGHP        0x34
  48#define DA9030_TBATHIGHN        0x35
  49#define DA9030_TBATLOW          0x36
  50
  51#define DA9030_VBAT_RES         0x41
  52#define DA9030_VBATMIN_RES      0x42
  53#define DA9030_VBATMINTXON_RES  0x43
  54#define DA9030_ICHMAX_RES       0x44
  55#define DA9030_ICHMIN_RES       0x45
  56#define DA9030_ICHAVERAGE_RES   0x46
  57#define DA9030_VCHMAX_RES       0x47
  58#define DA9030_VCHMIN_RES       0x48
  59#define DA9030_TBAT_RES         0x49
  60
  61struct da9030_adc_res {
  62        uint8_t vbat_res;
  63        uint8_t vbatmin_res;
  64        uint8_t vbatmintxon;
  65        uint8_t ichmax_res;
  66        uint8_t ichmin_res;
  67        uint8_t ichaverage_res;
  68        uint8_t vchmax_res;
  69        uint8_t vchmin_res;
  70        uint8_t tbat_res;
  71        uint8_t adc_in4_res;
  72        uint8_t adc_in5_res;
  73};
  74
  75struct da9030_battery_thresholds {
  76        int tbat_low;
  77        int tbat_high;
  78        int tbat_restart;
  79
  80        int vbat_low;
  81        int vbat_crit;
  82        int vbat_charge_start;
  83        int vbat_charge_stop;
  84        int vbat_charge_restart;
  85
  86        int vcharge_min;
  87        int vcharge_max;
  88};
  89
  90struct da9030_charger {
  91        struct power_supply psy;
  92
  93        struct device *master;
  94
  95        struct da9030_adc_res adc;
  96        struct delayed_work work;
  97        unsigned int interval;
  98
  99        struct power_supply_info *battery_info;
 100
 101        struct da9030_battery_thresholds thresholds;
 102
 103        unsigned int charge_milliamp;
 104        unsigned int charge_millivolt;
 105
 106        /* charger status */
 107        bool chdet;
 108        uint8_t fault;
 109        int mA;
 110        int mV;
 111        bool is_on;
 112
 113        struct notifier_block nb;
 114
 115        /* platform callbacks for battery low and critical events */
 116        void (*battery_low)(void);
 117        void (*battery_critical)(void);
 118
 119        struct dentry *debug_file;
 120};
 121
 122static inline int da9030_reg_to_mV(int reg)
 123{
 124        return ((reg * 2650) >> 8) + 2650;
 125}
 126
 127static inline int da9030_millivolt_to_reg(int mV)
 128{
 129        return ((mV - 2650) << 8) / 2650;
 130}
 131
 132static inline int da9030_reg_to_mA(int reg)
 133{
 134        return ((reg * 24000) >> 8) / 15;
 135}
 136
 137#ifdef CONFIG_DEBUG_FS
 138static int bat_debug_show(struct seq_file *s, void *data)
 139{
 140        struct da9030_charger *charger = s->private;
 141
 142        seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
 143        if (charger->chdet) {
 144                seq_printf(s, "iset = %dmA, vset = %dmV\n",
 145                           charger->mA, charger->mV);
 146        }
 147
 148        seq_printf(s, "vbat_res = %d (%dmV)\n",
 149                   charger->adc.vbat_res,
 150                   da9030_reg_to_mV(charger->adc.vbat_res));
 151        seq_printf(s, "vbatmin_res = %d (%dmV)\n",
 152                   charger->adc.vbatmin_res,
 153                   da9030_reg_to_mV(charger->adc.vbatmin_res));
 154        seq_printf(s, "vbatmintxon = %d (%dmV)\n",
 155                   charger->adc.vbatmintxon,
 156                   da9030_reg_to_mV(charger->adc.vbatmintxon));
 157        seq_printf(s, "ichmax_res = %d (%dmA)\n",
 158                   charger->adc.ichmax_res,
 159                   da9030_reg_to_mV(charger->adc.ichmax_res));
 160        seq_printf(s, "ichmin_res = %d (%dmA)\n",
 161                   charger->adc.ichmin_res,
 162                   da9030_reg_to_mA(charger->adc.ichmin_res));
 163        seq_printf(s, "ichaverage_res = %d (%dmA)\n",
 164                   charger->adc.ichaverage_res,
 165                   da9030_reg_to_mA(charger->adc.ichaverage_res));
 166        seq_printf(s, "vchmax_res = %d (%dmV)\n",
 167                   charger->adc.vchmax_res,
 168                   da9030_reg_to_mA(charger->adc.vchmax_res));
 169        seq_printf(s, "vchmin_res = %d (%dmV)\n",
 170                   charger->adc.vchmin_res,
 171                   da9030_reg_to_mV(charger->adc.vchmin_res));
 172
 173        return 0;
 174}
 175
 176static int debug_open(struct inode *inode, struct file *file)
 177{
 178        return single_open(file, bat_debug_show, inode->i_private);
 179}
 180
 181static const struct file_operations bat_debug_fops = {
 182        .open           = debug_open,
 183        .read           = seq_read,
 184        .llseek         = seq_lseek,
 185        .release        = single_release,
 186};
 187
 188static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 189{
 190        charger->debug_file = debugfs_create_file("charger", 0666, NULL,
 191                                                  charger, &bat_debug_fops);
 192        return charger->debug_file;
 193}
 194
 195static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 196{
 197        debugfs_remove(charger->debug_file);
 198}
 199#else
 200static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 201{
 202        return NULL;
 203}
 204static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 205{
 206}
 207#endif
 208
 209static inline void da9030_read_adc(struct da9030_charger *charger,
 210                                   struct da9030_adc_res *adc)
 211{
 212        da903x_reads(charger->master, DA9030_VBAT_RES,
 213                     sizeof(*adc), (uint8_t *)adc);
 214}
 215
 216static void da9030_charger_update_state(struct da9030_charger *charger)
 217{
 218        uint8_t val;
 219
 220        da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
 221        charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
 222        charger->mA = ((val >> 3) & 0xf) * 100;
 223        charger->mV = (val & 0x7) * 50 + 4000;
 224
 225        da9030_read_adc(charger, &charger->adc);
 226        da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
 227        charger->chdet = da903x_query_status(charger->master,
 228                                                     DA9030_STATUS_CHDET);
 229}
 230
 231static void da9030_set_charge(struct da9030_charger *charger, int on)
 232{
 233        uint8_t val;
 234
 235        if (on) {
 236                val = DA9030_CHRG_CHARGER_ENABLE;
 237                val |= (charger->charge_milliamp / 100) << 3;
 238                val |= (charger->charge_millivolt - 4000) / 50;
 239                charger->is_on = 1;
 240        } else {
 241                val = 0;
 242                charger->is_on = 0;
 243        }
 244
 245        da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
 246
 247        power_supply_changed(&charger->psy);
 248}
 249
 250static void da9030_charger_check_state(struct da9030_charger *charger)
 251{
 252        da9030_charger_update_state(charger);
 253
 254        /* we wake or boot with external power on */
 255        if (!charger->is_on) {
 256                if ((charger->chdet) &&
 257                    (charger->adc.vbat_res <
 258                     charger->thresholds.vbat_charge_start)) {
 259                        da9030_set_charge(charger, 1);
 260                }
 261        } else {
 262                /* Charger has been pulled out */
 263                if (!charger->chdet) {
 264                        da9030_set_charge(charger, 0);
 265                        return;
 266                }
 267
 268                if (charger->adc.vbat_res >=
 269                    charger->thresholds.vbat_charge_stop) {
 270                        da9030_set_charge(charger, 0);
 271                        da903x_write(charger->master, DA9030_VBATMON,
 272                                       charger->thresholds.vbat_charge_restart);
 273                } else if (charger->adc.vbat_res >
 274                           charger->thresholds.vbat_low) {
 275                        /* we are charging and passed LOW_THRESH,
 276                           so upate DA9030 VBAT threshold
 277                         */
 278                        da903x_write(charger->master, DA9030_VBATMON,
 279                                     charger->thresholds.vbat_low);
 280                }
 281                if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
 282                    charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
 283                    /* Tempreture readings are negative */
 284                    charger->adc.tbat_res < charger->thresholds.tbat_high ||
 285                    charger->adc.tbat_res > charger->thresholds.tbat_low) {
 286                        /* disable charger */
 287                        da9030_set_charge(charger, 0);
 288                }
 289        }
 290}
 291
 292static void da9030_charging_monitor(struct work_struct *work)
 293{
 294        struct da9030_charger *charger;
 295
 296        charger = container_of(work, struct da9030_charger, work.work);
 297
 298        da9030_charger_check_state(charger);
 299
 300        /* reschedule for the next time */
 301        schedule_delayed_work(&charger->work, charger->interval);
 302}
 303
 304static enum power_supply_property da9030_battery_props[] = {
 305        POWER_SUPPLY_PROP_MODEL_NAME,
 306        POWER_SUPPLY_PROP_STATUS,
 307        POWER_SUPPLY_PROP_HEALTH,
 308        POWER_SUPPLY_PROP_TECHNOLOGY,
 309        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 310        POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 311        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 312        POWER_SUPPLY_PROP_CURRENT_AVG,
 313};
 314
 315static void da9030_battery_check_status(struct da9030_charger *charger,
 316                                    union power_supply_propval *val)
 317{
 318        if (charger->chdet) {
 319                if (charger->is_on)
 320                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
 321                else
 322                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 323        } else {
 324                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 325        }
 326}
 327
 328static void da9030_battery_check_health(struct da9030_charger *charger,
 329                                    union power_supply_propval *val)
 330{
 331        if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
 332                val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 333        else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
 334                val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 335        else
 336                val->intval = POWER_SUPPLY_HEALTH_GOOD;
 337}
 338
 339static int da9030_battery_get_property(struct power_supply *psy,
 340                                   enum power_supply_property psp,
 341                                   union power_supply_propval *val)
 342{
 343        struct da9030_charger *charger;
 344        charger = container_of(psy, struct da9030_charger, psy);
 345
 346        switch (psp) {
 347        case POWER_SUPPLY_PROP_STATUS:
 348                da9030_battery_check_status(charger, val);
 349                break;
 350        case POWER_SUPPLY_PROP_HEALTH:
 351                da9030_battery_check_health(charger, val);
 352                break;
 353        case POWER_SUPPLY_PROP_TECHNOLOGY:
 354                val->intval = charger->battery_info->technology;
 355                break;
 356        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 357                val->intval = charger->battery_info->voltage_max_design;
 358                break;
 359        case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 360                val->intval = charger->battery_info->voltage_min_design;
 361                break;
 362        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 363                val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
 364                break;
 365        case POWER_SUPPLY_PROP_CURRENT_AVG:
 366                val->intval =
 367                        da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
 368                break;
 369        case POWER_SUPPLY_PROP_MODEL_NAME:
 370                val->strval = charger->battery_info->name;
 371                break;
 372        default:
 373                break;
 374        }
 375
 376        return 0;
 377}
 378
 379static void da9030_battery_vbat_event(struct da9030_charger *charger)
 380{
 381        da9030_read_adc(charger, &charger->adc);
 382
 383        if (charger->is_on)
 384                return;
 385
 386        if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
 387                /* set VBAT threshold for critical */
 388                da903x_write(charger->master, DA9030_VBATMON,
 389                             charger->thresholds.vbat_crit);
 390                if (charger->battery_low)
 391                        charger->battery_low();
 392        } else if (charger->adc.vbat_res <
 393                   charger->thresholds.vbat_crit) {
 394                /* notify the system of battery critical */
 395                if (charger->battery_critical)
 396                        charger->battery_critical();
 397        }
 398}
 399
 400static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
 401                                void *data)
 402{
 403        struct da9030_charger *charger =
 404                container_of(nb, struct da9030_charger, nb);
 405
 406        switch (event) {
 407        case DA9030_EVENT_CHDET:
 408                cancel_delayed_work_sync(&charger->work);
 409                schedule_work(&charger->work.work);
 410                break;
 411        case DA9030_EVENT_VBATMON:
 412                da9030_battery_vbat_event(charger);
 413                break;
 414        case DA9030_EVENT_CHIOVER:
 415        case DA9030_EVENT_TBAT:
 416                da9030_set_charge(charger, 0);
 417                break;
 418        }
 419
 420        return 0;
 421}
 422
 423static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
 424                                              struct da9030_battery_info *pdata)
 425{
 426        charger->thresholds.tbat_low = pdata->tbat_low;
 427        charger->thresholds.tbat_high = pdata->tbat_high;
 428        charger->thresholds.tbat_restart  = pdata->tbat_restart;
 429
 430        charger->thresholds.vbat_low =
 431                da9030_millivolt_to_reg(pdata->vbat_low);
 432        charger->thresholds.vbat_crit =
 433                da9030_millivolt_to_reg(pdata->vbat_crit);
 434        charger->thresholds.vbat_charge_start =
 435                da9030_millivolt_to_reg(pdata->vbat_charge_start);
 436        charger->thresholds.vbat_charge_stop =
 437                da9030_millivolt_to_reg(pdata->vbat_charge_stop);
 438        charger->thresholds.vbat_charge_restart =
 439                da9030_millivolt_to_reg(pdata->vbat_charge_restart);
 440
 441        charger->thresholds.vcharge_min =
 442                da9030_millivolt_to_reg(pdata->vcharge_min);
 443        charger->thresholds.vcharge_max =
 444                da9030_millivolt_to_reg(pdata->vcharge_max);
 445}
 446
 447static void da9030_battery_setup_psy(struct da9030_charger *charger)
 448{
 449        struct power_supply *psy = &charger->psy;
 450        struct power_supply_info *info = charger->battery_info;
 451
 452        psy->name = info->name;
 453        psy->use_for_apm = info->use_for_apm;
 454        psy->type = POWER_SUPPLY_TYPE_BATTERY;
 455        psy->get_property = da9030_battery_get_property;
 456
 457        psy->properties = da9030_battery_props;
 458        psy->num_properties = ARRAY_SIZE(da9030_battery_props);
 459};
 460
 461static int da9030_battery_charger_init(struct da9030_charger *charger)
 462{
 463        char v[5];
 464        int ret;
 465
 466        v[0] = v[1] = charger->thresholds.vbat_low;
 467        v[2] = charger->thresholds.tbat_high;
 468        v[3] = charger->thresholds.tbat_restart;
 469        v[4] = charger->thresholds.tbat_low;
 470
 471        ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
 472        if (ret)
 473                return ret;
 474
 475        /*
 476         * Enable reference voltage supply for ADC from the LDO_INTERNAL
 477         * regulator. Must be set before ADC measurements can be made.
 478         */
 479        ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
 480                           DA9030_ADC_LDO_INT_ENABLE |
 481                           DA9030_ADC_TBATREF_ENABLE);
 482        if (ret)
 483                return ret;
 484
 485        /* enable auto ADC measuremnts */
 486        return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
 487                            DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
 488                            DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
 489                            DA9030_ADC_VBAT_ENABLE |
 490                            DA9030_ADC_AUTO_SLEEP_ENABLE);
 491}
 492
 493static int da9030_battery_probe(struct platform_device *pdev)
 494{
 495        struct da9030_charger *charger;
 496        struct da9030_battery_info *pdata = pdev->dev.platform_data;
 497        int ret;
 498
 499        if (pdata == NULL)
 500                return -EINVAL;
 501
 502        if (pdata->charge_milliamp >= 1500 ||
 503            pdata->charge_millivolt < 4000 ||
 504            pdata->charge_millivolt > 4350)
 505                return -EINVAL;
 506
 507        charger = kzalloc(sizeof(*charger), GFP_KERNEL);
 508        if (charger == NULL)
 509                return -ENOMEM;
 510
 511        charger->master = pdev->dev.parent;
 512
 513        /* 10 seconds between monitor runs unless platform defines other
 514           interval */
 515        charger->interval = msecs_to_jiffies(
 516                (pdata->batmon_interval ? : 10) * 1000);
 517
 518        charger->charge_milliamp = pdata->charge_milliamp;
 519        charger->charge_millivolt = pdata->charge_millivolt;
 520        charger->battery_info = pdata->battery_info;
 521        charger->battery_low = pdata->battery_low;
 522        charger->battery_critical = pdata->battery_critical;
 523
 524        da9030_battery_convert_thresholds(charger, pdata);
 525
 526        ret = da9030_battery_charger_init(charger);
 527        if (ret)
 528                goto err_charger_init;
 529
 530        INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
 531        schedule_delayed_work(&charger->work, charger->interval);
 532
 533        charger->nb.notifier_call = da9030_battery_event;
 534        ret = da903x_register_notifier(charger->master, &charger->nb,
 535                                       DA9030_EVENT_CHDET |
 536                                       DA9030_EVENT_VBATMON |
 537                                       DA9030_EVENT_CHIOVER |
 538                                       DA9030_EVENT_TBAT);
 539        if (ret)
 540                goto err_notifier;
 541
 542        da9030_battery_setup_psy(charger);
 543        ret = power_supply_register(&pdev->dev, &charger->psy);
 544        if (ret)
 545                goto err_ps_register;
 546
 547        charger->debug_file = da9030_bat_create_debugfs(charger);
 548        platform_set_drvdata(pdev, charger);
 549        return 0;
 550
 551err_ps_register:
 552        da903x_unregister_notifier(charger->master, &charger->nb,
 553                                   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 554                                   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 555err_notifier:
 556        cancel_delayed_work(&charger->work);
 557
 558err_charger_init:
 559        kfree(charger);
 560
 561        return ret;
 562}
 563
 564static int da9030_battery_remove(struct platform_device *dev)
 565{
 566        struct da9030_charger *charger = platform_get_drvdata(dev);
 567
 568        da9030_bat_remove_debugfs(charger);
 569
 570        da903x_unregister_notifier(charger->master, &charger->nb,
 571                                   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 572                                   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 573        cancel_delayed_work_sync(&charger->work);
 574        da9030_set_charge(charger, 0);
 575        power_supply_unregister(&charger->psy);
 576
 577        kfree(charger);
 578
 579        return 0;
 580}
 581
 582static struct platform_driver da903x_battery_driver = {
 583        .driver = {
 584                .name   = "da903x-battery",
 585                .owner  = THIS_MODULE,
 586        },
 587        .probe = da9030_battery_probe,
 588        .remove = da9030_battery_remove,
 589};
 590
 591module_platform_driver(da903x_battery_driver);
 592
 593MODULE_DESCRIPTION("DA9030 battery charger driver");
 594MODULE_AUTHOR("Mike Rapoport, CompuLab");
 595MODULE_LICENSE("GPL");
 596
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