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