linux/drivers/power/lp8788-charger.c
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   1/*
   2 * TI LP8788 MFD - battery charger driver
   3 *
   4 * Copyright 2012 Texas Instruments
   5 *
   6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 */
  13
  14#include <linux/err.h>
  15#include <linux/iio/consumer.h>
  16#include <linux/interrupt.h>
  17#include <linux/irqdomain.h>
  18#include <linux/mfd/lp8788.h>
  19#include <linux/module.h>
  20#include <linux/platform_device.h>
  21#include <linux/power_supply.h>
  22#include <linux/slab.h>
  23#include <linux/workqueue.h>
  24
  25/* register address */
  26#define LP8788_CHG_STATUS               0x07
  27#define LP8788_CHG_IDCIN                0x13
  28#define LP8788_CHG_IBATT                0x14
  29#define LP8788_CHG_VTERM                0x15
  30#define LP8788_CHG_EOC                  0x16
  31
  32/* mask/shift bits */
  33#define LP8788_CHG_INPUT_STATE_M        0x03    /* Addr 07h */
  34#define LP8788_CHG_STATE_M              0x3C
  35#define LP8788_CHG_STATE_S              2
  36#define LP8788_NO_BATT_M                BIT(6)
  37#define LP8788_BAD_BATT_M               BIT(7)
  38#define LP8788_CHG_IBATT_M              0x1F    /* Addr 14h */
  39#define LP8788_CHG_VTERM_M              0x0F    /* Addr 15h */
  40#define LP8788_CHG_EOC_LEVEL_M          0x30    /* Addr 16h */
  41#define LP8788_CHG_EOC_LEVEL_S          4
  42#define LP8788_CHG_EOC_TIME_M           0x0E
  43#define LP8788_CHG_EOC_TIME_S           1
  44#define LP8788_CHG_EOC_MODE_M           BIT(0)
  45
  46#define LP8788_CHARGER_NAME             "charger"
  47#define LP8788_BATTERY_NAME             "main_batt"
  48
  49#define LP8788_CHG_START                0x11
  50#define LP8788_CHG_END                  0x1C
  51
  52#define LP8788_BUF_SIZE                 40
  53#define LP8788_ISEL_MAX                 23
  54#define LP8788_ISEL_STEP                50
  55#define LP8788_VTERM_MIN                4100
  56#define LP8788_VTERM_STEP               25
  57#define LP8788_MAX_BATT_CAPACITY        100
  58#define LP8788_MAX_CHG_IRQS             11
  59
  60enum lp8788_charging_state {
  61        LP8788_OFF,
  62        LP8788_WARM_UP,
  63        LP8788_LOW_INPUT = 0x3,
  64        LP8788_PRECHARGE,
  65        LP8788_CC,
  66        LP8788_CV,
  67        LP8788_MAINTENANCE,
  68        LP8788_BATTERY_FAULT,
  69        LP8788_SYSTEM_SUPPORT = 0xC,
  70        LP8788_HIGH_CURRENT = 0xF,
  71        LP8788_MAX_CHG_STATE,
  72};
  73
  74enum lp8788_charger_adc_sel {
  75        LP8788_VBATT,
  76        LP8788_BATT_TEMP,
  77        LP8788_NUM_CHG_ADC,
  78};
  79
  80enum lp8788_charger_input_state {
  81        LP8788_SYSTEM_SUPPLY = 1,
  82        LP8788_FULL_FUNCTION,
  83};
  84
  85/*
  86 * struct lp8788_chg_irq
  87 * @which        : lp8788 interrupt id
  88 * @virq         : Linux IRQ number from irq_domain
  89 */
  90struct lp8788_chg_irq {
  91        enum lp8788_int_id which;
  92        int virq;
  93};
  94
  95/*
  96 * struct lp8788_charger
  97 * @lp           : used for accessing the registers of mfd lp8788 device
  98 * @charger      : power supply driver for the battery charger
  99 * @battery      : power supply driver for the battery
 100 * @charger_work : work queue for charger input interrupts
 101 * @chan         : iio channels for getting adc values
 102 *                 eg) battery voltage, capacity and temperature
 103 * @irqs         : charger dedicated interrupts
 104 * @num_irqs     : total numbers of charger interrupts
 105 * @pdata        : charger platform specific data
 106 */
 107struct lp8788_charger {
 108        struct lp8788 *lp;
 109        struct power_supply charger;
 110        struct power_supply battery;
 111        struct work_struct charger_work;
 112        struct iio_channel *chan[LP8788_NUM_CHG_ADC];
 113        struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
 114        int num_irqs;
 115        struct lp8788_charger_platform_data *pdata;
 116};
 117
 118static char *battery_supplied_to[] = {
 119        LP8788_BATTERY_NAME,
 120};
 121
 122static enum power_supply_property lp8788_charger_prop[] = {
 123        POWER_SUPPLY_PROP_ONLINE,
 124        POWER_SUPPLY_PROP_CURRENT_MAX,
 125};
 126
 127static enum power_supply_property lp8788_battery_prop[] = {
 128        POWER_SUPPLY_PROP_STATUS,
 129        POWER_SUPPLY_PROP_HEALTH,
 130        POWER_SUPPLY_PROP_PRESENT,
 131        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 132        POWER_SUPPLY_PROP_CAPACITY,
 133        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 134        POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 135        POWER_SUPPLY_PROP_TEMP,
 136};
 137
 138static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
 139{
 140        u8 data;
 141
 142        lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 143        data &= LP8788_CHG_INPUT_STATE_M;
 144
 145        return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
 146}
 147
 148static int lp8788_charger_get_property(struct power_supply *psy,
 149                                        enum power_supply_property psp,
 150                                        union power_supply_propval *val)
 151{
 152        struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
 153        u8 read;
 154
 155        switch (psp) {
 156        case POWER_SUPPLY_PROP_ONLINE:
 157                val->intval = lp8788_is_charger_detected(pchg);
 158                break;
 159        case POWER_SUPPLY_PROP_CURRENT_MAX:
 160                lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
 161                val->intval = LP8788_ISEL_STEP *
 162                                (min_t(int, read, LP8788_ISEL_MAX) + 1);
 163                break;
 164        default:
 165                return -EINVAL;
 166        }
 167
 168        return 0;
 169}
 170
 171static int lp8788_get_battery_status(struct lp8788_charger *pchg,
 172                                union power_supply_propval *val)
 173{
 174        enum lp8788_charging_state state;
 175        u8 data;
 176        int ret;
 177
 178        ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 179        if (ret)
 180                return ret;
 181
 182        state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 183        switch (state) {
 184        case LP8788_OFF:
 185                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 186                break;
 187        case LP8788_PRECHARGE:
 188        case LP8788_CC:
 189        case LP8788_CV:
 190        case LP8788_HIGH_CURRENT:
 191                val->intval = POWER_SUPPLY_STATUS_CHARGING;
 192                break;
 193        case LP8788_MAINTENANCE:
 194                val->intval = POWER_SUPPLY_STATUS_FULL;
 195                break;
 196        default:
 197                val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 198                break;
 199        }
 200
 201        return 0;
 202}
 203
 204static int lp8788_get_battery_health(struct lp8788_charger *pchg,
 205                                union power_supply_propval *val)
 206{
 207        u8 data;
 208        int ret;
 209
 210        ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 211        if (ret)
 212                return ret;
 213
 214        if (data & LP8788_NO_BATT_M)
 215                val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 216        else if (data & LP8788_BAD_BATT_M)
 217                val->intval = POWER_SUPPLY_HEALTH_DEAD;
 218        else
 219                val->intval = POWER_SUPPLY_HEALTH_GOOD;
 220
 221        return 0;
 222}
 223
 224static int lp8788_get_battery_present(struct lp8788_charger *pchg,
 225                                union power_supply_propval *val)
 226{
 227        u8 data;
 228        int ret;
 229
 230        ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 231        if (ret)
 232                return ret;
 233
 234        val->intval = !(data & LP8788_NO_BATT_M);
 235        return 0;
 236}
 237
 238static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg,
 239                                unsigned int *result)
 240{
 241        struct iio_channel *channel = pchg->chan[LP8788_VBATT];
 242        int scaleint;
 243        int scalepart;
 244        int ret;
 245
 246        if (!channel)
 247                return -EINVAL;
 248
 249        ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
 250        if (ret != IIO_VAL_INT_PLUS_MICRO)
 251                return -EINVAL;
 252
 253        /* unit: mV */
 254        *result = (scaleint + scalepart * 1000000) / 1000;
 255
 256        return 0;
 257}
 258
 259static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
 260                                union power_supply_propval *val)
 261{
 262        return lp8788_get_vbatt_adc(pchg, &val->intval);
 263}
 264
 265static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
 266                                union power_supply_propval *val)
 267{
 268        struct lp8788 *lp = pchg->lp;
 269        struct lp8788_charger_platform_data *pdata = pchg->pdata;
 270        unsigned int max_vbatt;
 271        unsigned int vbatt;
 272        enum lp8788_charging_state state;
 273        u8 data;
 274        int ret;
 275
 276        if (!pdata)
 277                return -EINVAL;
 278
 279        max_vbatt = pdata->max_vbatt_mv;
 280        if (max_vbatt == 0)
 281                return -EINVAL;
 282
 283        ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
 284        if (ret)
 285                return ret;
 286
 287        state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 288
 289        if (state == LP8788_MAINTENANCE) {
 290                val->intval = LP8788_MAX_BATT_CAPACITY;
 291        } else {
 292                ret = lp8788_get_vbatt_adc(pchg, &vbatt);
 293                if (ret)
 294                        return ret;
 295
 296                val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
 297                val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
 298        }
 299
 300        return 0;
 301}
 302
 303static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
 304                                union power_supply_propval *val)
 305{
 306        struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
 307        int scaleint;
 308        int scalepart;
 309        int ret;
 310
 311        if (!channel)
 312                return -EINVAL;
 313
 314        ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
 315        if (ret != IIO_VAL_INT_PLUS_MICRO)
 316                return -EINVAL;
 317
 318        /* unit: 0.1 'C */
 319        val->intval = (scaleint + scalepart * 1000000) / 100;
 320
 321        return 0;
 322}
 323
 324static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
 325                                union power_supply_propval *val)
 326{
 327        u8 read;
 328
 329        lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
 330        read &= LP8788_CHG_IBATT_M;
 331        val->intval = LP8788_ISEL_STEP *
 332                        (min_t(int, read, LP8788_ISEL_MAX) + 1);
 333
 334        return 0;
 335}
 336
 337static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
 338                                union power_supply_propval *val)
 339{
 340        u8 read;
 341
 342        lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
 343        read &= LP8788_CHG_VTERM_M;
 344        val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
 345
 346        return 0;
 347}
 348
 349static int lp8788_battery_get_property(struct power_supply *psy,
 350                                        enum power_supply_property psp,
 351                                        union power_supply_propval *val)
 352{
 353        struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
 354
 355        switch (psp) {
 356        case POWER_SUPPLY_PROP_STATUS:
 357                return lp8788_get_battery_status(pchg, val);
 358        case POWER_SUPPLY_PROP_HEALTH:
 359                return lp8788_get_battery_health(pchg, val);
 360        case POWER_SUPPLY_PROP_PRESENT:
 361                return lp8788_get_battery_present(pchg, val);
 362        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 363                return lp8788_get_battery_voltage(pchg, val);
 364        case POWER_SUPPLY_PROP_CAPACITY:
 365                return lp8788_get_battery_capacity(pchg, val);
 366        case POWER_SUPPLY_PROP_TEMP:
 367                return lp8788_get_battery_temperature(pchg, val);
 368        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 369                return lp8788_get_battery_charging_current(pchg, val);
 370        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 371                return lp8788_get_charging_termination_voltage(pchg, val);
 372        default:
 373                return -EINVAL;
 374        }
 375}
 376
 377static inline bool lp8788_is_valid_charger_register(u8 addr)
 378{
 379        return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
 380}
 381
 382static int lp8788_update_charger_params(struct lp8788_charger *pchg)
 383{
 384        struct lp8788 *lp = pchg->lp;
 385        struct lp8788_charger_platform_data *pdata = pchg->pdata;
 386        struct lp8788_chg_param *param;
 387        int i;
 388        int ret;
 389
 390        if (!pdata || !pdata->chg_params) {
 391                dev_info(lp->dev, "skip updating charger parameters\n");
 392                return 0;
 393        }
 394
 395        /* settting charging parameters */
 396        for (i = 0; i < pdata->num_chg_params; i++) {
 397                param = pdata->chg_params + i;
 398
 399                if (!param)
 400                        continue;
 401
 402                if (lp8788_is_valid_charger_register(param->addr)) {
 403                        ret = lp8788_write_byte(lp, param->addr, param->val);
 404                        if (ret)
 405                                return ret;
 406                }
 407        }
 408
 409        return 0;
 410}
 411
 412static int lp8788_psy_register(struct platform_device *pdev,
 413                                struct lp8788_charger *pchg)
 414{
 415        pchg->charger.name = LP8788_CHARGER_NAME;
 416        pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
 417        pchg->charger.properties = lp8788_charger_prop;
 418        pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
 419        pchg->charger.get_property = lp8788_charger_get_property;
 420        pchg->charger.supplied_to = battery_supplied_to;
 421        pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 422
 423        if (power_supply_register(&pdev->dev, &pchg->charger))
 424                return -EPERM;
 425
 426        pchg->battery.name = LP8788_BATTERY_NAME;
 427        pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 428        pchg->battery.properties = lp8788_battery_prop;
 429        pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
 430        pchg->battery.get_property = lp8788_battery_get_property;
 431
 432        if (power_supply_register(&pdev->dev, &pchg->battery))
 433                return -EPERM;
 434
 435        return 0;
 436}
 437
 438static void lp8788_psy_unregister(struct lp8788_charger *pchg)
 439{
 440        power_supply_unregister(&pchg->battery);
 441        power_supply_unregister(&pchg->charger);
 442}
 443
 444static void lp8788_charger_event(struct work_struct *work)
 445{
 446        struct lp8788_charger *pchg =
 447                container_of(work, struct lp8788_charger, charger_work);
 448        struct lp8788_charger_platform_data *pdata = pchg->pdata;
 449        enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
 450
 451        pdata->charger_event(pchg->lp, event);
 452}
 453
 454static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
 455{
 456        bool found;
 457        int i;
 458
 459        for (i = 0; i < pchg->num_irqs; i++) {
 460                if (pchg->irqs[i].virq == virq) {
 461                        *id = pchg->irqs[i].which;
 462                        found = true;
 463                        break;
 464                }
 465        }
 466
 467        return found;
 468}
 469
 470static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
 471{
 472        struct lp8788_charger *pchg = ptr;
 473        struct lp8788_charger_platform_data *pdata = pchg->pdata;
 474        int id = -1;
 475
 476        if (!lp8788_find_irq_id(pchg, virq, &id))
 477                return IRQ_NONE;
 478
 479        switch (id) {
 480        case LP8788_INT_CHG_INPUT_STATE:
 481        case LP8788_INT_CHG_STATE:
 482        case LP8788_INT_EOC:
 483        case LP8788_INT_BATT_LOW:
 484        case LP8788_INT_NO_BATT:
 485                power_supply_changed(&pchg->charger);
 486                power_supply_changed(&pchg->battery);
 487                break;
 488        default:
 489                break;
 490        }
 491
 492        /* report charger dectection event if used */
 493        if (!pdata)
 494                goto irq_handled;
 495
 496        if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
 497                schedule_work(&pchg->charger_work);
 498
 499irq_handled:
 500        return IRQ_HANDLED;
 501}
 502
 503static int lp8788_set_irqs(struct platform_device *pdev,
 504                        struct lp8788_charger *pchg, const char *name)
 505{
 506        struct resource *r;
 507        struct irq_domain *irqdm = pchg->lp->irqdm;
 508        int irq_start;
 509        int irq_end;
 510        int virq;
 511        int nr_irq;
 512        int i;
 513        int ret;
 514
 515        /* no error even if no irq resource */
 516        r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
 517        if (!r)
 518                return 0;
 519
 520        irq_start = r->start;
 521        irq_end = r->end;
 522
 523        for (i = irq_start; i <= irq_end; i++) {
 524                nr_irq = pchg->num_irqs;
 525
 526                virq = irq_create_mapping(irqdm, i);
 527                pchg->irqs[nr_irq].virq = virq;
 528                pchg->irqs[nr_irq].which = i;
 529                pchg->num_irqs++;
 530
 531                ret = request_threaded_irq(virq, NULL,
 532                                        lp8788_charger_irq_thread,
 533                                        0, name, pchg);
 534                if (ret)
 535                        break;
 536        }
 537
 538        if (i <= irq_end)
 539                goto err_free_irq;
 540
 541        return 0;
 542
 543err_free_irq:
 544        for (i = 0; i < pchg->num_irqs; i++)
 545                free_irq(pchg->irqs[i].virq, pchg);
 546        return ret;
 547}
 548
 549static int lp8788_irq_register(struct platform_device *pdev,
 550                                struct lp8788_charger *pchg)
 551{
 552        struct lp8788 *lp = pchg->lp;
 553        const char *name[] = {
 554                LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
 555        };
 556        int i;
 557        int ret;
 558
 559        INIT_WORK(&pchg->charger_work, lp8788_charger_event);
 560        pchg->num_irqs = 0;
 561
 562        for (i = 0; i < ARRAY_SIZE(name); i++) {
 563                ret = lp8788_set_irqs(pdev, pchg, name[i]);
 564                if (ret) {
 565                        dev_warn(lp->dev, "irq setup failed: %s\n", name[i]);
 566                        return ret;
 567                }
 568        }
 569
 570        if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
 571                dev_err(lp->dev, "invalid total number of irqs: %d\n",
 572                        pchg->num_irqs);
 573                return -EINVAL;
 574        }
 575
 576
 577        return 0;
 578}
 579
 580static void lp8788_irq_unregister(struct platform_device *pdev,
 581                                  struct lp8788_charger *pchg)
 582{
 583        int i;
 584        int irq;
 585
 586        for (i = 0; i < pchg->num_irqs; i++) {
 587                irq = pchg->irqs[i].virq;
 588                if (!irq)
 589                        continue;
 590
 591                free_irq(irq, pchg);
 592        }
 593}
 594
 595static void lp8788_setup_adc_channel(struct lp8788_charger *pchg)
 596{
 597        struct lp8788_charger_platform_data *pdata = pchg->pdata;
 598        struct device *dev = pchg->lp->dev;
 599        struct iio_channel *chan;
 600        enum lp8788_adc_id id;
 601        const char *chan_name[LPADC_MAX] = {
 602                [LPADC_VBATT_5P5] = "vbatt-5p5",
 603                [LPADC_VBATT_6P0] = "vbatt-6p0",
 604                [LPADC_VBATT_5P0] = "vbatt-5p0",
 605                [LPADC_ADC1]      = "adc1",
 606                [LPADC_ADC2]      = "adc2",
 607                [LPADC_ADC3]      = "adc3",
 608                [LPADC_ADC4]      = "adc4",
 609        };
 610
 611        if (!pdata)
 612                return;
 613
 614        id = pdata->vbatt_adc;
 615        switch (id) {
 616        case LPADC_VBATT_5P5:
 617        case LPADC_VBATT_6P0:
 618        case LPADC_VBATT_5P0:
 619                chan = iio_channel_get(NULL, chan_name[id]);
 620                pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
 621                break;
 622        default:
 623                dev_err(dev, "invalid ADC id for VBATT: %d\n", id);
 624                pchg->chan[LP8788_VBATT] = NULL;
 625                break;
 626        }
 627
 628        id = pdata->batt_temp_adc;
 629        switch (id) {
 630        case LPADC_ADC1:
 631        case LPADC_ADC2:
 632        case LPADC_ADC3:
 633        case LPADC_ADC4:
 634                chan = iio_channel_get(NULL, chan_name[id]);
 635                pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
 636                break;
 637        default:
 638                dev_err(dev, "invalid ADC id for BATT_TEMP : %d\n", id);
 639                pchg->chan[LP8788_BATT_TEMP] = NULL;
 640                break;
 641        }
 642}
 643
 644static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
 645{
 646        int i;
 647
 648        for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
 649                if (!pchg->chan[i])
 650                        continue;
 651
 652                iio_channel_release(pchg->chan[i]);
 653                pchg->chan[i] = NULL;
 654        }
 655}
 656
 657static ssize_t lp8788_show_charger_status(struct device *dev,
 658                                struct device_attribute *attr, char *buf)
 659{
 660        struct lp8788_charger *pchg = dev_get_drvdata(dev);
 661        enum lp8788_charging_state state;
 662        char *desc[LP8788_MAX_CHG_STATE] = {
 663                [LP8788_OFF] = "CHARGER OFF",
 664                [LP8788_WARM_UP] = "WARM UP",
 665                [LP8788_LOW_INPUT] = "LOW INPUT STATE",
 666                [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
 667                [LP8788_CC] = "CHARGING - CC",
 668                [LP8788_CV] = "CHARGING - CV",
 669                [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
 670                [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
 671                [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
 672                [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
 673        };
 674        u8 data;
 675
 676        lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 677        state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 678
 679        return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
 680}
 681
 682static ssize_t lp8788_show_eoc_time(struct device *dev,
 683                                struct device_attribute *attr, char *buf)
 684{
 685        struct lp8788_charger *pchg = dev_get_drvdata(dev);
 686        char *stime[] = { "400ms", "5min", "10min", "15min",
 687                        "20min", "25min", "30min" "No timeout" };
 688        u8 val;
 689
 690        lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 691        val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
 692
 693        return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
 694                        stime[val]);
 695}
 696
 697static ssize_t lp8788_show_eoc_level(struct device *dev,
 698                                struct device_attribute *attr, char *buf)
 699{
 700        struct lp8788_charger *pchg = dev_get_drvdata(dev);
 701        char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
 702        char *relative_level[] = { "5%", "10%", "15%", "20%" };
 703        char *level;
 704        u8 val;
 705        u8 mode;
 706
 707        lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 708
 709        mode = val & LP8788_CHG_EOC_MODE_M;
 710        val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
 711        level = mode ? abs_level[val] : relative_level[val];
 712
 713        return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
 714                        level);
 715}
 716
 717static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
 718static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
 719static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
 720
 721static struct attribute *lp8788_charger_attr[] = {
 722        &dev_attr_charger_status.attr,
 723        &dev_attr_eoc_time.attr,
 724        &dev_attr_eoc_level.attr,
 725        NULL,
 726};
 727
 728static const struct attribute_group lp8788_attr_group = {
 729        .attrs = lp8788_charger_attr,
 730};
 731
 732static __devinit int lp8788_charger_probe(struct platform_device *pdev)
 733{
 734        struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
 735        struct lp8788_charger *pchg;
 736        int ret;
 737
 738        pchg = devm_kzalloc(lp->dev, sizeof(struct lp8788_charger), GFP_KERNEL);
 739        if (!pchg)
 740                return -ENOMEM;
 741
 742        pchg->lp = lp;
 743        pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
 744        platform_set_drvdata(pdev, pchg);
 745
 746        ret = lp8788_update_charger_params(pchg);
 747        if (ret)
 748                return ret;
 749
 750        lp8788_setup_adc_channel(pchg);
 751
 752        ret = lp8788_psy_register(pdev, pchg);
 753        if (ret)
 754                return ret;
 755
 756        ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
 757        if (ret) {
 758                lp8788_psy_unregister(pchg);
 759                return ret;
 760        }
 761
 762        ret = lp8788_irq_register(pdev, pchg);
 763        if (ret)
 764                dev_warn(lp->dev, "failed to register charger irq: %d\n", ret);
 765
 766        return 0;
 767}
 768
 769static int __devexit lp8788_charger_remove(struct platform_device *pdev)
 770{
 771        struct lp8788_charger *pchg = platform_get_drvdata(pdev);
 772
 773        flush_work(&pchg->charger_work);
 774        lp8788_irq_unregister(pdev, pchg);
 775        sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
 776        lp8788_psy_unregister(pchg);
 777        lp8788_release_adc_channel(pchg);
 778
 779        return 0;
 780}
 781
 782static struct platform_driver lp8788_charger_driver = {
 783        .probe = lp8788_charger_probe,
 784        .remove = __devexit_p(lp8788_charger_remove),
 785        .driver = {
 786                .name = LP8788_DEV_CHARGER,
 787                .owner = THIS_MODULE,
 788        },
 789};
 790module_platform_driver(lp8788_charger_driver);
 791
 792MODULE_DESCRIPTION("TI LP8788 Charger Driver");
 793MODULE_AUTHOR("Milo Kim");
 794MODULE_LICENSE("GPL");
 795MODULE_ALIAS("platform:lp8788-charger");
 796
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