linux/drivers/power/supply/max8925_power.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Battery driver for Maxim MAX8925
   4 *
   5 * Copyright (c) 2009-2010 Marvell International Ltd.
   6 *      Haojian Zhuang <haojian.zhuang@marvell.com>
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/err.h>
  11#include <linux/slab.h>
  12#include <linux/of.h>
  13#include <linux/i2c.h>
  14#include <linux/interrupt.h>
  15#include <linux/platform_device.h>
  16#include <linux/power_supply.h>
  17#include <linux/mfd/max8925.h>
  18
  19/* registers in GPM */
  20#define MAX8925_OUT5VEN                 0x54
  21#define MAX8925_OUT3VEN                 0x58
  22#define MAX8925_CHG_CNTL1               0x7c
  23
  24/* bits definition */
  25#define MAX8925_CHG_STAT_VSYSLOW        (1 << 0)
  26#define MAX8925_CHG_STAT_MODE_MASK      (3 << 2)
  27#define MAX8925_CHG_STAT_EN_MASK        (1 << 4)
  28#define MAX8925_CHG_MBDET               (1 << 1)
  29#define MAX8925_CHG_AC_RANGE_MASK       (3 << 6)
  30
  31/* registers in ADC */
  32#define MAX8925_ADC_RES_CNFG1           0x06
  33#define MAX8925_ADC_AVG_CNFG1           0x07
  34#define MAX8925_ADC_ACQ_CNFG1           0x08
  35#define MAX8925_ADC_ACQ_CNFG2           0x09
  36/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
  37#define MAX8925_ADC_AUX2                0x62
  38#define MAX8925_ADC_VCHG                0x64
  39#define MAX8925_ADC_VBBATT              0x66
  40#define MAX8925_ADC_VMBATT              0x68
  41#define MAX8925_ADC_ISNS                0x6a
  42#define MAX8925_ADC_THM                 0x6c
  43#define MAX8925_ADC_TDIE                0x6e
  44#define MAX8925_CMD_AUX2                0xc8
  45#define MAX8925_CMD_VCHG                0xd0
  46#define MAX8925_CMD_VBBATT              0xd8
  47#define MAX8925_CMD_VMBATT              0xe0
  48#define MAX8925_CMD_ISNS                0xe8
  49#define MAX8925_CMD_THM                 0xf0
  50#define MAX8925_CMD_TDIE                0xf8
  51
  52enum {
  53        MEASURE_AUX2,
  54        MEASURE_VCHG,
  55        MEASURE_VBBATT,
  56        MEASURE_VMBATT,
  57        MEASURE_ISNS,
  58        MEASURE_THM,
  59        MEASURE_TDIE,
  60        MEASURE_MAX,
  61};
  62
  63struct max8925_power_info {
  64        struct max8925_chip     *chip;
  65        struct i2c_client       *gpm;
  66        struct i2c_client       *adc;
  67
  68        struct power_supply     *ac;
  69        struct power_supply     *usb;
  70        struct power_supply     *battery;
  71        int                     irq_base;
  72        unsigned                ac_online:1;
  73        unsigned                usb_online:1;
  74        unsigned                bat_online:1;
  75        unsigned                chg_mode:2;
  76        unsigned                batt_detect:1;  /* detecing MB by ID pin */
  77        unsigned                topoff_threshold:2;
  78        unsigned                fast_charge:3;
  79        unsigned                no_temp_support:1;
  80        unsigned                no_insert_detect:1;
  81
  82        int (*set_charger) (int);
  83};
  84
  85static int __set_charger(struct max8925_power_info *info, int enable)
  86{
  87        struct max8925_chip *chip = info->chip;
  88        if (enable) {
  89                /* enable charger in platform */
  90                if (info->set_charger)
  91                        info->set_charger(1);
  92                /* enable charger */
  93                max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
  94        } else {
  95                /* disable charge */
  96                max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
  97                if (info->set_charger)
  98                        info->set_charger(0);
  99        }
 100        dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
 101                : "Disable charger");
 102        return 0;
 103}
 104
 105static irqreturn_t max8925_charger_handler(int irq, void *data)
 106{
 107        struct max8925_power_info *info = (struct max8925_power_info *)data;
 108        struct max8925_chip *chip = info->chip;
 109
 110        switch (irq - chip->irq_base) {
 111        case MAX8925_IRQ_VCHG_DC_R:
 112                info->ac_online = 1;
 113                __set_charger(info, 1);
 114                dev_dbg(chip->dev, "Adapter inserted\n");
 115                break;
 116        case MAX8925_IRQ_VCHG_DC_F:
 117                info->ac_online = 0;
 118                __set_charger(info, 0);
 119                dev_dbg(chip->dev, "Adapter removed\n");
 120                break;
 121        case MAX8925_IRQ_VCHG_THM_OK_F:
 122                /* Battery is not ready yet */
 123                dev_dbg(chip->dev, "Battery temperature is out of range\n");
 124                /* Fall through */
 125        case MAX8925_IRQ_VCHG_DC_OVP:
 126                dev_dbg(chip->dev, "Error detection\n");
 127                __set_charger(info, 0);
 128                break;
 129        case MAX8925_IRQ_VCHG_THM_OK_R:
 130                /* Battery is ready now */
 131                dev_dbg(chip->dev, "Battery temperature is in range\n");
 132                break;
 133        case MAX8925_IRQ_VCHG_SYSLOW_R:
 134                /* VSYS is low */
 135                dev_info(chip->dev, "Sys power is too low\n");
 136                break;
 137        case MAX8925_IRQ_VCHG_SYSLOW_F:
 138                dev_dbg(chip->dev, "Sys power is above low threshold\n");
 139                break;
 140        case MAX8925_IRQ_VCHG_DONE:
 141                __set_charger(info, 0);
 142                dev_dbg(chip->dev, "Charging is done\n");
 143                break;
 144        case MAX8925_IRQ_VCHG_TOPOFF:
 145                dev_dbg(chip->dev, "Charging in top-off mode\n");
 146                break;
 147        case MAX8925_IRQ_VCHG_TMR_FAULT:
 148                __set_charger(info, 0);
 149                dev_dbg(chip->dev, "Safe timer is expired\n");
 150                break;
 151        case MAX8925_IRQ_VCHG_RST:
 152                __set_charger(info, 0);
 153                dev_dbg(chip->dev, "Charger is reset\n");
 154                break;
 155        }
 156        return IRQ_HANDLED;
 157}
 158
 159static int start_measure(struct max8925_power_info *info, int type)
 160{
 161        unsigned char buf[2] = {0, 0};
 162        int meas_cmd;
 163        int meas_reg = 0, ret;
 164
 165        switch (type) {
 166        case MEASURE_VCHG:
 167                meas_cmd = MAX8925_CMD_VCHG;
 168                meas_reg = MAX8925_ADC_VCHG;
 169                break;
 170        case MEASURE_VBBATT:
 171                meas_cmd = MAX8925_CMD_VBBATT;
 172                meas_reg = MAX8925_ADC_VBBATT;
 173                break;
 174        case MEASURE_VMBATT:
 175                meas_cmd = MAX8925_CMD_VMBATT;
 176                meas_reg = MAX8925_ADC_VMBATT;
 177                break;
 178        case MEASURE_ISNS:
 179                meas_cmd = MAX8925_CMD_ISNS;
 180                meas_reg = MAX8925_ADC_ISNS;
 181                break;
 182        default:
 183                return -EINVAL;
 184        }
 185
 186        max8925_reg_write(info->adc, meas_cmd, 0);
 187        max8925_bulk_read(info->adc, meas_reg, 2, buf);
 188        ret = ((buf[0]<<8) | buf[1]) >> 4;
 189
 190        return ret;
 191}
 192
 193static int max8925_ac_get_prop(struct power_supply *psy,
 194                               enum power_supply_property psp,
 195                               union power_supply_propval *val)
 196{
 197        struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
 198        int ret = 0;
 199
 200        switch (psp) {
 201        case POWER_SUPPLY_PROP_ONLINE:
 202                val->intval = info->ac_online;
 203                break;
 204        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 205                if (info->ac_online) {
 206                        ret = start_measure(info, MEASURE_VCHG);
 207                        if (ret >= 0) {
 208                                val->intval = ret * 2000;       /* unit is uV */
 209                                goto out;
 210                        }
 211                }
 212                ret = -ENODATA;
 213                break;
 214        default:
 215                ret = -ENODEV;
 216                break;
 217        }
 218out:
 219        return ret;
 220}
 221
 222static enum power_supply_property max8925_ac_props[] = {
 223        POWER_SUPPLY_PROP_ONLINE,
 224        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 225};
 226
 227static int max8925_usb_get_prop(struct power_supply *psy,
 228                                enum power_supply_property psp,
 229                                union power_supply_propval *val)
 230{
 231        struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
 232        int ret = 0;
 233
 234        switch (psp) {
 235        case POWER_SUPPLY_PROP_ONLINE:
 236                val->intval = info->usb_online;
 237                break;
 238        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 239                if (info->usb_online) {
 240                        ret = start_measure(info, MEASURE_VCHG);
 241                        if (ret >= 0) {
 242                                val->intval = ret * 2000;       /* unit is uV */
 243                                goto out;
 244                        }
 245                }
 246                ret = -ENODATA;
 247                break;
 248        default:
 249                ret = -ENODEV;
 250                break;
 251        }
 252out:
 253        return ret;
 254}
 255
 256static enum power_supply_property max8925_usb_props[] = {
 257        POWER_SUPPLY_PROP_ONLINE,
 258        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 259};
 260
 261static int max8925_bat_get_prop(struct power_supply *psy,
 262                                enum power_supply_property psp,
 263                                union power_supply_propval *val)
 264{
 265        struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
 266        int ret = 0;
 267
 268        switch (psp) {
 269        case POWER_SUPPLY_PROP_ONLINE:
 270                val->intval = info->bat_online;
 271                break;
 272        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 273                if (info->bat_online) {
 274                        ret = start_measure(info, MEASURE_VMBATT);
 275                        if (ret >= 0) {
 276                                val->intval = ret * 2000;       /* unit is uV */
 277                                ret = 0;
 278                                break;
 279                        }
 280                }
 281                ret = -ENODATA;
 282                break;
 283        case POWER_SUPPLY_PROP_CURRENT_NOW:
 284                if (info->bat_online) {
 285                        ret = start_measure(info, MEASURE_ISNS);
 286                        if (ret >= 0) {
 287                                /* assume r_sns is 0.02 */
 288                                ret = ((ret * 6250) - 3125) /* uA */;
 289                                val->intval = 0;
 290                                if (ret > 0)
 291                                        val->intval = ret; /* unit is mA */
 292                                ret = 0;
 293                                break;
 294                        }
 295                }
 296                ret = -ENODATA;
 297                break;
 298        case POWER_SUPPLY_PROP_CHARGE_TYPE:
 299                if (!info->bat_online) {
 300                        ret = -ENODATA;
 301                        break;
 302                }
 303                ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 304                ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
 305                switch (ret) {
 306                case 1:
 307                        val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 308                        break;
 309                case 0:
 310                case 2:
 311                        val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 312                        break;
 313                case 3:
 314                        val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 315                        break;
 316                }
 317                ret = 0;
 318                break;
 319        case POWER_SUPPLY_PROP_STATUS:
 320                if (!info->bat_online) {
 321                        ret = -ENODATA;
 322                        break;
 323                }
 324                ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 325                if (info->usb_online || info->ac_online) {
 326                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 327                        if (ret & MAX8925_CHG_STAT_EN_MASK)
 328                                val->intval = POWER_SUPPLY_STATUS_CHARGING;
 329                } else
 330                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 331                ret = 0;
 332                break;
 333        default:
 334                ret = -ENODEV;
 335                break;
 336        }
 337        return ret;
 338}
 339
 340static enum power_supply_property max8925_battery_props[] = {
 341        POWER_SUPPLY_PROP_ONLINE,
 342        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 343        POWER_SUPPLY_PROP_CURRENT_NOW,
 344        POWER_SUPPLY_PROP_CHARGE_TYPE,
 345        POWER_SUPPLY_PROP_STATUS,
 346};
 347
 348static const struct power_supply_desc ac_desc = {
 349        .name           = "max8925-ac",
 350        .type           = POWER_SUPPLY_TYPE_MAINS,
 351        .properties     = max8925_ac_props,
 352        .num_properties = ARRAY_SIZE(max8925_ac_props),
 353        .get_property   = max8925_ac_get_prop,
 354};
 355
 356static const struct power_supply_desc usb_desc = {
 357        .name           = "max8925-usb",
 358        .type           = POWER_SUPPLY_TYPE_USB,
 359        .properties     = max8925_usb_props,
 360        .num_properties = ARRAY_SIZE(max8925_usb_props),
 361        .get_property   = max8925_usb_get_prop,
 362};
 363
 364static const struct power_supply_desc battery_desc = {
 365        .name           = "max8925-battery",
 366        .type           = POWER_SUPPLY_TYPE_BATTERY,
 367        .properties     = max8925_battery_props,
 368        .num_properties = ARRAY_SIZE(max8925_battery_props),
 369        .get_property   = max8925_bat_get_prop,
 370};
 371
 372#define REQUEST_IRQ(_irq, _name)                                        \
 373do {                                                                    \
 374        ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
 375                                    max8925_charger_handler,            \
 376                                    IRQF_ONESHOT, _name, info);         \
 377        if (ret)                                                        \
 378                dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
 379                        _irq, ret);                                     \
 380} while (0)
 381
 382static int max8925_init_charger(struct max8925_chip *chip,
 383                                          struct max8925_power_info *info)
 384{
 385        int ret;
 386
 387        REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
 388        if (!info->no_insert_detect) {
 389                REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
 390                REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
 391        }
 392        if (!info->no_temp_support) {
 393                REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
 394                REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
 395        }
 396        REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
 397        REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
 398        REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
 399        REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
 400        REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 401        REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 402
 403        info->usb_online = 0;
 404        info->bat_online = 0;
 405
 406        /* check for power - can miss interrupt at boot time */
 407        if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
 408                info->ac_online = 1;
 409        else
 410                info->ac_online = 0;
 411
 412        ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 413        if (ret >= 0) {
 414                /*
 415                 * If battery detection is enabled, ID pin of battery is
 416                 * connected to MBDET pin of MAX8925. It could be used to
 417                 * detect battery presence.
 418                 * Otherwise, we have to assume that battery is always on.
 419                 */
 420                if (info->batt_detect)
 421                        info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
 422                else
 423                        info->bat_online = 1;
 424                if (ret & MAX8925_CHG_AC_RANGE_MASK)
 425                        info->ac_online = 1;
 426                else
 427                        info->ac_online = 0;
 428        }
 429        /* disable charge */
 430        max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
 431        /* set charging current in charge topoff mode */
 432        max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
 433                         info->topoff_threshold << 5);
 434        /* set charing current in fast charge mode */
 435        max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
 436
 437        return 0;
 438}
 439
 440static int max8925_deinit_charger(struct max8925_power_info *info)
 441{
 442        struct max8925_chip *chip = info->chip;
 443        int irq;
 444
 445        irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
 446        for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
 447                free_irq(irq, info);
 448
 449        return 0;
 450}
 451
 452#ifdef CONFIG_OF
 453static struct max8925_power_pdata *
 454max8925_power_dt_init(struct platform_device *pdev)
 455{
 456        struct device_node *nproot = pdev->dev.parent->of_node;
 457        struct device_node *np;
 458        int batt_detect;
 459        int topoff_threshold;
 460        int fast_charge;
 461        int no_temp_support;
 462        int no_insert_detect;
 463        struct max8925_power_pdata *pdata;
 464
 465        if (!nproot)
 466                return pdev->dev.platform_data;
 467
 468        np = of_get_child_by_name(nproot, "charger");
 469        if (!np) {
 470                dev_err(&pdev->dev, "failed to find charger node\n");
 471                return NULL;
 472        }
 473
 474        pdata = devm_kzalloc(&pdev->dev,
 475                        sizeof(struct max8925_power_pdata),
 476                        GFP_KERNEL);
 477        if (!pdata)
 478                goto ret;
 479
 480        of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
 481        of_property_read_u32(np, "batt-detect", &batt_detect);
 482        of_property_read_u32(np, "fast-charge", &fast_charge);
 483        of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
 484        of_property_read_u32(np, "no-temp-support", &no_temp_support);
 485
 486        pdata->batt_detect = batt_detect;
 487        pdata->fast_charge = fast_charge;
 488        pdata->topoff_threshold = topoff_threshold;
 489        pdata->no_insert_detect = no_insert_detect;
 490        pdata->no_temp_support = no_temp_support;
 491
 492ret:
 493        of_node_put(np);
 494        return pdata;
 495}
 496#else
 497static struct max8925_power_pdata *
 498max8925_power_dt_init(struct platform_device *pdev)
 499{
 500        return pdev->dev.platform_data;
 501}
 502#endif
 503
 504static int max8925_power_probe(struct platform_device *pdev)
 505{
 506        struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 507        struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
 508        struct max8925_power_pdata *pdata = NULL;
 509        struct max8925_power_info *info;
 510        int ret;
 511
 512        pdata = max8925_power_dt_init(pdev);
 513        if (!pdata) {
 514                dev_err(&pdev->dev, "platform data isn't assigned to "
 515                        "power supply\n");
 516                return -EINVAL;
 517        }
 518
 519        info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
 520                                GFP_KERNEL);
 521        if (!info)
 522                return -ENOMEM;
 523        info->chip = chip;
 524        info->gpm = chip->i2c;
 525        info->adc = chip->adc;
 526        platform_set_drvdata(pdev, info);
 527
 528        psy_cfg.supplied_to = pdata->supplied_to;
 529        psy_cfg.num_supplicants = pdata->num_supplicants;
 530
 531        info->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
 532        if (IS_ERR(info->ac)) {
 533                ret = PTR_ERR(info->ac);
 534                goto out;
 535        }
 536        info->ac->dev.parent = &pdev->dev;
 537
 538        info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
 539        if (IS_ERR(info->usb)) {
 540                ret = PTR_ERR(info->usb);
 541                goto out_unregister_ac;
 542        }
 543        info->usb->dev.parent = &pdev->dev;
 544
 545        info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
 546        if (IS_ERR(info->battery)) {
 547                ret = PTR_ERR(info->battery);
 548                goto out_unregister_usb;
 549        }
 550        info->battery->dev.parent = &pdev->dev;
 551
 552        info->batt_detect = pdata->batt_detect;
 553        info->topoff_threshold = pdata->topoff_threshold;
 554        info->fast_charge = pdata->fast_charge;
 555        info->set_charger = pdata->set_charger;
 556        info->no_temp_support = pdata->no_temp_support;
 557        info->no_insert_detect = pdata->no_insert_detect;
 558
 559        max8925_init_charger(chip, info);
 560        return 0;
 561out_unregister_usb:
 562        power_supply_unregister(info->usb);
 563out_unregister_ac:
 564        power_supply_unregister(info->ac);
 565out:
 566        return ret;
 567}
 568
 569static int max8925_power_remove(struct platform_device *pdev)
 570{
 571        struct max8925_power_info *info = platform_get_drvdata(pdev);
 572
 573        if (info) {
 574                power_supply_unregister(info->ac);
 575                power_supply_unregister(info->usb);
 576                power_supply_unregister(info->battery);
 577                max8925_deinit_charger(info);
 578        }
 579        return 0;
 580}
 581
 582static struct platform_driver max8925_power_driver = {
 583        .probe  = max8925_power_probe,
 584        .remove = max8925_power_remove,
 585        .driver = {
 586                .name   = "max8925-power",
 587        },
 588};
 589
 590module_platform_driver(max8925_power_driver);
 591
 592MODULE_LICENSE("GPL");
 593MODULE_DESCRIPTION("Power supply driver for MAX8925");
 594MODULE_ALIAS("platform:max8925-power");
 595