linux/drivers/power/supply/sc2731_charger.c
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   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Spreadtrum Communications Inc.
   3
   4#include <linux/module.h>
   5#include <linux/platform_device.h>
   6#include <linux/power_supply.h>
   7#include <linux/usb/phy.h>
   8#include <linux/regmap.h>
   9#include <linux/notifier.h>
  10#include <linux/of.h>
  11
  12/* PMIC global registers definition */
  13#define SC2731_CHARGE_STATUS            0xedc
  14#define SC2731_CHARGE_FULL              BIT(4)
  15#define SC2731_MODULE_EN1               0xc0c
  16#define SC2731_CHARGE_EN                BIT(5)
  17
  18/* SC2731 switch charger registers definition */
  19#define SC2731_CHG_CFG0                 0x0
  20#define SC2731_CHG_CFG1                 0x4
  21#define SC2731_CHG_CFG2                 0x8
  22#define SC2731_CHG_CFG3                 0xc
  23#define SC2731_CHG_CFG4                 0x10
  24#define SC2731_CHG_CFG5                 0x28
  25
  26/* SC2731_CHG_CFG0 register definition */
  27#define SC2731_PRECHG_RNG_SHIFT         11
  28#define SC2731_PRECHG_RNG_MASK          GENMASK(12, 11)
  29
  30#define SC2731_TERMINATION_VOL_MASK     GENMASK(2, 1)
  31#define SC2731_TERMINATION_VOL_SHIFT    1
  32#define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3)
  33#define SC2731_TERMINATION_VOL_CAL_SHIFT        3
  34#define SC2731_TERMINATION_CUR_MASK     GENMASK(2, 0)
  35
  36#define SC2731_CC_EN                    BIT(13)
  37#define SC2731_CHARGER_PD               BIT(0)
  38
  39/* SC2731_CHG_CFG1 register definition */
  40#define SC2731_CUR_MASK                 GENMASK(5, 0)
  41
  42/* SC2731_CHG_CFG5 register definition */
  43#define SC2731_CUR_LIMIT_SHIFT          8
  44#define SC2731_CUR_LIMIT_MASK           GENMASK(9, 8)
  45
  46/* Default current definition (unit is mA) */
  47#define SC2731_CURRENT_LIMIT_100        100
  48#define SC2731_CURRENT_LIMIT_500        500
  49#define SC2731_CURRENT_LIMIT_900        900
  50#define SC2731_CURRENT_LIMIT_2000       2000
  51#define SC2731_CURRENT_PRECHG           450
  52#define SC2731_CURRENT_STEP             50
  53
  54struct sc2731_charger_info {
  55        struct device *dev;
  56        struct regmap *regmap;
  57        struct usb_phy *usb_phy;
  58        struct notifier_block usb_notify;
  59        struct power_supply *psy_usb;
  60        struct work_struct work;
  61        struct mutex lock;
  62        bool charging;
  63        u32 base;
  64        u32 limit;
  65};
  66
  67static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
  68{
  69        regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
  70                           SC2731_CC_EN, 0);
  71
  72        regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
  73                           SC2731_CHARGER_PD, SC2731_CHARGER_PD);
  74}
  75
  76static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
  77{
  78        int ret;
  79
  80        /* Enable charger constant current mode */
  81        ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
  82                                 SC2731_CC_EN, SC2731_CC_EN);
  83        if (ret)
  84                return ret;
  85
  86        /* Start charging */
  87        return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
  88                                  SC2731_CHARGER_PD, 0);
  89}
  90
  91static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
  92                                            u32 limit)
  93{
  94        u32 val;
  95
  96        if (limit <= SC2731_CURRENT_LIMIT_100)
  97                val = 0;
  98        else if (limit <= SC2731_CURRENT_LIMIT_500)
  99                val = 3;
 100        else if (limit <= SC2731_CURRENT_LIMIT_900)
 101                val = 2;
 102        else
 103                val = 1;
 104
 105        return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
 106                                  SC2731_CUR_LIMIT_MASK,
 107                                  val << SC2731_CUR_LIMIT_SHIFT);
 108}
 109
 110static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
 111{
 112        u32 val;
 113        int ret;
 114
 115        if (cur > SC2731_CURRENT_LIMIT_2000)
 116                cur = SC2731_CURRENT_LIMIT_2000;
 117        else if (cur < SC2731_CURRENT_PRECHG)
 118                cur = SC2731_CURRENT_PRECHG;
 119
 120        /* Calculate the step value, each step is 50 mA */
 121        val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;
 122
 123        /* Set pre-charge current as 450 mA */
 124        ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
 125                                 SC2731_PRECHG_RNG_MASK,
 126                                 0x3 << SC2731_PRECHG_RNG_SHIFT);
 127        if (ret)
 128                return ret;
 129
 130        return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
 131                                  SC2731_CUR_MASK, val);
 132}
 133
 134static int sc2731_charger_get_status(struct sc2731_charger_info *info)
 135{
 136        u32 val;
 137        int ret;
 138
 139        ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
 140        if (ret)
 141                return ret;
 142
 143        if (val & SC2731_CHARGE_FULL)
 144                return POWER_SUPPLY_STATUS_FULL;
 145
 146        return POWER_SUPPLY_STATUS_CHARGING;
 147}
 148
 149static int sc2731_charger_get_current(struct sc2731_charger_info *info,
 150                                      u32 *cur)
 151{
 152        int ret;
 153        u32 val;
 154
 155        ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val);
 156        if (ret)
 157                return ret;
 158
 159        val &= SC2731_CUR_MASK;
 160        *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG;
 161
 162        return 0;
 163}
 164
 165static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info,
 166                                            u32 *cur)
 167{
 168        int ret;
 169        u32 val;
 170
 171        ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val);
 172        if (ret)
 173                return ret;
 174
 175        val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT;
 176
 177        switch (val) {
 178        case 0:
 179                *cur = SC2731_CURRENT_LIMIT_100;
 180                break;
 181
 182        case 1:
 183                *cur = SC2731_CURRENT_LIMIT_2000;
 184                break;
 185
 186        case 2:
 187                *cur = SC2731_CURRENT_LIMIT_900;
 188                break;
 189
 190        case 3:
 191                *cur = SC2731_CURRENT_LIMIT_500;
 192                break;
 193
 194        default:
 195                return -EINVAL;
 196        }
 197
 198        return 0;
 199}
 200
 201static int
 202sc2731_charger_usb_set_property(struct power_supply *psy,
 203                                enum power_supply_property psp,
 204                                const union power_supply_propval *val)
 205{
 206        struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
 207        int ret;
 208
 209        mutex_lock(&info->lock);
 210
 211        if (!info->charging) {
 212                mutex_unlock(&info->lock);
 213                return -ENODEV;
 214        }
 215
 216        switch (psp) {
 217        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 218                ret = sc2731_charger_set_current(info, val->intval / 1000);
 219                if (ret < 0)
 220                        dev_err(info->dev, "set charge current failed\n");
 221                break;
 222
 223        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 224                ret = sc2731_charger_set_current_limit(info,
 225                                                       val->intval / 1000);
 226                if (ret < 0)
 227                        dev_err(info->dev, "set input current limit failed\n");
 228                break;
 229
 230        default:
 231                ret = -EINVAL;
 232        }
 233
 234        mutex_unlock(&info->lock);
 235        return ret;
 236}
 237
 238static int sc2731_charger_usb_get_property(struct power_supply *psy,
 239                                           enum power_supply_property psp,
 240                                           union power_supply_propval *val)
 241{
 242        struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
 243        int ret = 0;
 244        u32 cur;
 245
 246        mutex_lock(&info->lock);
 247
 248        switch (psp) {
 249        case POWER_SUPPLY_PROP_STATUS:
 250                if (info->charging)
 251                        val->intval = sc2731_charger_get_status(info);
 252                else
 253                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 254                break;
 255
 256        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 257                if (!info->charging) {
 258                        val->intval = 0;
 259                } else {
 260                        ret = sc2731_charger_get_current(info, &cur);
 261                        if (ret)
 262                                goto out;
 263
 264                        val->intval = cur * 1000;
 265                }
 266                break;
 267
 268        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 269                if (!info->charging) {
 270                        val->intval = 0;
 271                } else {
 272                        ret = sc2731_charger_get_current_limit(info, &cur);
 273                        if (ret)
 274                                goto out;
 275
 276                        val->intval = cur * 1000;
 277                }
 278                break;
 279
 280        default:
 281                ret = -EINVAL;
 282        }
 283
 284out:
 285        mutex_unlock(&info->lock);
 286        return ret;
 287}
 288
 289static int sc2731_charger_property_is_writeable(struct power_supply *psy,
 290                                                enum power_supply_property psp)
 291{
 292        int ret;
 293
 294        switch (psp) {
 295        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 296        case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 297                ret = 1;
 298                break;
 299
 300        default:
 301                ret = 0;
 302        }
 303
 304        return ret;
 305}
 306
 307static enum power_supply_property sc2731_usb_props[] = {
 308        POWER_SUPPLY_PROP_STATUS,
 309        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 310        POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 311};
 312
 313static const struct power_supply_desc sc2731_charger_desc = {
 314        .name                   = "sc2731_charger",
 315        .type                   = POWER_SUPPLY_TYPE_USB,
 316        .properties             = sc2731_usb_props,
 317        .num_properties         = ARRAY_SIZE(sc2731_usb_props),
 318        .get_property           = sc2731_charger_usb_get_property,
 319        .set_property           = sc2731_charger_usb_set_property,
 320        .property_is_writeable  = sc2731_charger_property_is_writeable,
 321};
 322
 323static void sc2731_charger_work(struct work_struct *data)
 324{
 325        struct sc2731_charger_info *info =
 326                container_of(data, struct sc2731_charger_info, work);
 327        int ret;
 328
 329        mutex_lock(&info->lock);
 330
 331        if (info->limit > 0 && !info->charging) {
 332                /* set current limitation and start to charge */
 333                ret = sc2731_charger_set_current_limit(info, info->limit);
 334                if (ret)
 335                        goto out;
 336
 337                ret = sc2731_charger_set_current(info, info->limit);
 338                if (ret)
 339                        goto out;
 340
 341                ret = sc2731_charger_start_charge(info);
 342                if (ret)
 343                        goto out;
 344
 345                info->charging = true;
 346        } else if (!info->limit && info->charging) {
 347                /* Stop charging */
 348                info->charging = false;
 349                sc2731_charger_stop_charge(info);
 350        }
 351
 352out:
 353        mutex_unlock(&info->lock);
 354}
 355
 356static int sc2731_charger_usb_change(struct notifier_block *nb,
 357                                     unsigned long limit, void *data)
 358{
 359        struct sc2731_charger_info *info =
 360                container_of(nb, struct sc2731_charger_info, usb_notify);
 361
 362        info->limit = limit;
 363
 364        schedule_work(&info->work);
 365
 366        return NOTIFY_OK;
 367}
 368
 369static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
 370{
 371        struct power_supply_battery_info bat_info = { };
 372        u32 term_currrent, term_voltage, cur_val, vol_val;
 373        int ret;
 374
 375        /* Enable charger module */
 376        ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
 377                                 SC2731_CHARGE_EN, SC2731_CHARGE_EN);
 378        if (ret)
 379                return ret;
 380
 381        ret = power_supply_get_battery_info(info->psy_usb, &bat_info);
 382        if (ret) {
 383                dev_warn(info->dev, "no battery information is supplied\n");
 384
 385                /*
 386                 * If no battery information is supplied, we should set
 387                 * default charge termination current to 120 mA, and default
 388                 * charge termination voltage to 4.35V.
 389                 */
 390                cur_val = 0x2;
 391                vol_val = 0x1;
 392        } else {
 393                term_currrent = bat_info.charge_term_current_ua / 1000;
 394
 395                if (term_currrent <= 90)
 396                        cur_val = 0;
 397                else if (term_currrent >= 265)
 398                        cur_val = 0x7;
 399                else
 400                        cur_val = ((term_currrent - 90) / 25) + 1;
 401
 402                term_voltage = bat_info.constant_charge_voltage_max_uv / 1000;
 403
 404                if (term_voltage > 4500)
 405                        term_voltage = 4500;
 406
 407                if (term_voltage > 4200)
 408                        vol_val = (term_voltage - 4200) / 100;
 409                else
 410                        vol_val = 0;
 411
 412                power_supply_put_battery_info(info->psy_usb, &bat_info);
 413        }
 414
 415        /* Set charge termination current */
 416        ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
 417                                 SC2731_TERMINATION_CUR_MASK, cur_val);
 418        if (ret)
 419                goto error;
 420
 421        /* Set charge termination voltage */
 422        ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
 423                                 SC2731_TERMINATION_VOL_MASK |
 424                                 SC2731_TERMINATION_VOL_CAL_MASK,
 425                                 (vol_val << SC2731_TERMINATION_VOL_SHIFT) |
 426                                 (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT));
 427        if (ret)
 428                goto error;
 429
 430        return 0;
 431
 432error:
 433        regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0);
 434        return ret;
 435}
 436
 437static void sc2731_charger_detect_status(struct sc2731_charger_info *info)
 438{
 439        unsigned int min, max;
 440
 441        /*
 442         * If the USB charger status has been USB_CHARGER_PRESENT before
 443         * registering the notifier, we should start to charge with getting
 444         * the charge current.
 445         */
 446        if (info->usb_phy->chg_state != USB_CHARGER_PRESENT)
 447                return;
 448
 449        usb_phy_get_charger_current(info->usb_phy, &min, &max);
 450        info->limit = min;
 451
 452        schedule_work(&info->work);
 453}
 454
 455static int sc2731_charger_probe(struct platform_device *pdev)
 456{
 457        struct device_node *np = pdev->dev.of_node;
 458        struct sc2731_charger_info *info;
 459        struct power_supply_config charger_cfg = { };
 460        int ret;
 461
 462        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 463        if (!info)
 464                return -ENOMEM;
 465
 466        mutex_init(&info->lock);
 467        info->dev = &pdev->dev;
 468        INIT_WORK(&info->work, sc2731_charger_work);
 469
 470        info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 471        if (!info->regmap) {
 472                dev_err(&pdev->dev, "failed to get charger regmap\n");
 473                return -ENODEV;
 474        }
 475
 476        ret = of_property_read_u32(np, "reg", &info->base);
 477        if (ret) {
 478                dev_err(&pdev->dev, "failed to get register address\n");
 479                return -ENODEV;
 480        }
 481
 482        charger_cfg.drv_data = info;
 483        charger_cfg.of_node = np;
 484        info->psy_usb = devm_power_supply_register(&pdev->dev,
 485                                                   &sc2731_charger_desc,
 486                                                   &charger_cfg);
 487        if (IS_ERR(info->psy_usb)) {
 488                dev_err(&pdev->dev, "failed to register power supply\n");
 489                return PTR_ERR(info->psy_usb);
 490        }
 491
 492        ret = sc2731_charger_hw_init(info);
 493        if (ret)
 494                return ret;
 495
 496        info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
 497        if (IS_ERR(info->usb_phy)) {
 498                dev_err(&pdev->dev, "failed to find USB phy\n");
 499                return PTR_ERR(info->usb_phy);
 500        }
 501
 502        info->usb_notify.notifier_call = sc2731_charger_usb_change;
 503        ret = usb_register_notifier(info->usb_phy, &info->usb_notify);
 504        if (ret) {
 505                dev_err(&pdev->dev, "failed to register notifier: %d\n", ret);
 506                return ret;
 507        }
 508
 509        sc2731_charger_detect_status(info);
 510
 511        return 0;
 512}
 513
 514static int sc2731_charger_remove(struct platform_device *pdev)
 515{
 516        struct sc2731_charger_info *info = platform_get_drvdata(pdev);
 517
 518        usb_unregister_notifier(info->usb_phy, &info->usb_notify);
 519
 520        return 0;
 521}
 522
 523static const struct of_device_id sc2731_charger_of_match[] = {
 524        { .compatible = "sprd,sc2731-charger", },
 525        { }
 526};
 527
 528static struct platform_driver sc2731_charger_driver = {
 529        .driver = {
 530                .name = "sc2731-charger",
 531                .of_match_table = sc2731_charger_of_match,
 532        },
 533        .probe = sc2731_charger_probe,
 534        .remove = sc2731_charger_remove,
 535};
 536
 537module_platform_driver(sc2731_charger_driver);
 538
 539MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver");
 540MODULE_LICENSE("GPL v2");
 541