linux/drivers/power/88pm860x_battery.c
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   1/*
   2 * Battery driver for Marvell 88PM860x PMIC
   3 *
   4 * Copyright (c) 2012 Marvell International Ltd.
   5 * Author:      Jett Zhou <jtzhou@marvell.com>
   6 *              Haojian Zhuang <haojian.zhuang@marvell.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#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16#include <linux/slab.h>
  17#include <linux/mutex.h>
  18#include <linux/string.h>
  19#include <linux/power_supply.h>
  20#include <linux/mfd/88pm860x.h>
  21#include <linux/delay.h>
  22
  23/* bit definitions of Status Query Interface 2 */
  24#define STATUS2_CHG                     (1 << 2)
  25#define STATUS2_BAT                     (1 << 3)
  26#define STATUS2_VBUS                    (1 << 4)
  27
  28/* bit definitions of Measurement Enable 1 Register */
  29#define MEAS1_TINT                      (1 << 3)
  30#define MEAS1_GP1                       (1 << 5)
  31
  32/* bit definitions of Measurement Enable 3 Register */
  33#define MEAS3_IBAT                      (1 << 0)
  34#define MEAS3_BAT_DET                   (1 << 1)
  35#define MEAS3_CC                        (1 << 2)
  36
  37/* bit definitions of Measurement Off Time Register */
  38#define MEAS_OFF_SLEEP_EN               (1 << 1)
  39
  40/* bit definitions of GPADC Bias Current 2 Register */
  41#define GPBIAS2_GPADC1_SET              (2 << 4)
  42/* GPADC1 Bias Current value in uA unit */
  43#define GPBIAS2_GPADC1_UA               ((GPBIAS2_GPADC1_SET >> 4) * 5 + 1)
  44
  45/* bit definitions of GPADC Misc 1 Register */
  46#define GPMISC1_GPADC_EN                (1 << 0)
  47
  48/* bit definitions of Charger Control 6 Register */
  49#define CC6_BAT_DET_GPADC1              1
  50
  51/* bit definitions of Coulomb Counter Reading Register */
  52#define CCNT_AVG_SEL                    (4 << 3)
  53
  54/* bit definitions of RTC miscellaneous Register1 */
  55#define RTC_SOC_5LSB            (0x1F << 3)
  56
  57/* bit definitions of RTC Register1 */
  58#define RTC_SOC_3MSB            (0x7)
  59
  60/* bit definitions of Power up Log register */
  61#define BAT_WU_LOG                      (1<<6)
  62
  63/* coulomb counter index */
  64#define CCNT_POS1                       0
  65#define CCNT_POS2                       1
  66#define CCNT_NEG1                       2
  67#define CCNT_NEG2                       3
  68#define CCNT_SPOS                       4
  69#define CCNT_SNEG                       5
  70
  71/* OCV -- Open Circuit Voltage */
  72#define OCV_MODE_ACTIVE                 0
  73#define OCV_MODE_SLEEP                  1
  74
  75/* Vbat range of CC for measuring Rbat */
  76#define LOW_BAT_THRESHOLD               3600
  77#define VBATT_RESISTOR_MIN              3800
  78#define VBATT_RESISTOR_MAX              4100
  79
  80/* TBAT for batt, TINT for chip itself */
  81#define PM860X_TEMP_TINT                (0)
  82#define PM860X_TEMP_TBAT                (1)
  83
  84/*
  85 * Battery temperature based on NTC resistor, defined
  86 * corresponding resistor value  -- Ohm / C degeree.
  87 */
  88#define TBAT_NEG_25D            127773  /* -25 */
  89#define TBAT_NEG_10D            54564   /* -10 */
  90#define TBAT_0D                 32330   /* 0 */
  91#define TBAT_10D                19785   /* 10 */
  92#define TBAT_20D                12468   /* 20 */
  93#define TBAT_30D                8072    /* 30 */
  94#define TBAT_40D                5356    /* 40 */
  95
  96struct pm860x_battery_info {
  97        struct pm860x_chip *chip;
  98        struct i2c_client *i2c;
  99        struct device *dev;
 100
 101        struct power_supply battery;
 102        struct mutex lock;
 103        int status;
 104        int irq_cc;
 105        int irq_batt;
 106        int max_capacity;
 107        int resistor;           /* Battery Internal Resistor */
 108        int last_capacity;
 109        int start_soc;
 110        unsigned present:1;
 111        unsigned temp_type:1;   /* TINT or TBAT */
 112};
 113
 114struct ccnt {
 115        unsigned long long int pos;
 116        unsigned long long int neg;
 117        unsigned int spos;
 118        unsigned int sneg;
 119
 120        int total_chg;          /* mAh(3.6C) */
 121        int total_dischg;       /* mAh(3.6C) */
 122};
 123
 124/*
 125 * State of Charge.
 126 * The first number is mAh(=3.6C), and the second number is percent point.
 127 */
 128static int array_soc[][2] = {
 129        {4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96},
 130        {4102, 95}, {4088, 94}, {4081, 93}, {4070, 92}, {4060, 91},
 131        {4053, 90}, {4044, 89}, {4035, 88}, {4028, 87}, {4019, 86},
 132        {4013, 85}, {4006, 84}, {3995, 83}, {3987, 82}, {3982, 81},
 133        {3976, 80}, {3968, 79}, {3962, 78}, {3954, 77}, {3946, 76},
 134        {3941, 75}, {3934, 74}, {3929, 73}, {3922, 72}, {3916, 71},
 135        {3910, 70}, {3904, 69}, {3898, 68}, {3892, 67}, {3887, 66},
 136        {3880, 65}, {3874, 64}, {3868, 63}, {3862, 62}, {3854, 61},
 137        {3849, 60}, {3843, 59}, {3840, 58}, {3833, 57}, {3829, 56},
 138        {3824, 55}, {3818, 54}, {3815, 53}, {3810, 52}, {3808, 51},
 139        {3804, 50}, {3801, 49}, {3798, 48}, {3796, 47}, {3792, 46},
 140        {3789, 45}, {3785, 44}, {3784, 43}, {3782, 42}, {3780, 41},
 141        {3777, 40}, {3776, 39}, {3774, 38}, {3772, 37}, {3771, 36},
 142        {3769, 35}, {3768, 34}, {3764, 33}, {3763, 32}, {3760, 31},
 143        {3760, 30}, {3754, 29}, {3750, 28}, {3749, 27}, {3744, 26},
 144        {3740, 25}, {3734, 24}, {3732, 23}, {3728, 22}, {3726, 21},
 145        {3720, 20}, {3716, 19}, {3709, 18}, {3703, 17}, {3698, 16},
 146        {3692, 15}, {3683, 14}, {3675, 13}, {3670, 12}, {3665, 11},
 147        {3661, 10}, {3649, 9}, {3637, 8}, {3622, 7}, {3609, 6},
 148        {3580, 5}, {3558, 4}, {3540, 3}, {3510, 2}, {3429, 1},
 149};
 150
 151static struct ccnt ccnt_data;
 152
 153/*
 154 * register 1 bit[7:0] -- bit[11:4] of measured value of voltage
 155 * register 0 bit[3:0] -- bit[3:0] of measured value of voltage
 156 */
 157static int measure_12bit_voltage(struct pm860x_battery_info *info,
 158                                 int offset, int *data)
 159{
 160        unsigned char buf[2];
 161        int ret;
 162
 163        ret = pm860x_bulk_read(info->i2c, offset, 2, buf);
 164        if (ret < 0)
 165                return ret;
 166
 167        *data = ((buf[0] & 0xff) << 4) | (buf[1] & 0x0f);
 168        /* V_MEAS(mV) = data * 1.8 * 1000 / (2^12) */
 169        *data = ((*data & 0xfff) * 9 * 25) >> 9;
 170        return 0;
 171}
 172
 173static int measure_vbatt(struct pm860x_battery_info *info, int state,
 174                         int *data)
 175{
 176        unsigned char buf[5];
 177        int ret;
 178
 179        switch (state) {
 180        case OCV_MODE_ACTIVE:
 181                ret = measure_12bit_voltage(info, PM8607_VBAT_MEAS1, data);
 182                if (ret)
 183                        return ret;
 184                /* V_BATT_MEAS(mV) = value * 3 * 1.8 * 1000 / (2^12) */
 185                *data *= 3;
 186                break;
 187        case OCV_MODE_SLEEP:
 188                /*
 189                 * voltage value of VBATT in sleep mode is saved in different
 190                 * registers.
 191                 * bit[11:10] -- bit[7:6] of LDO9(0x18)
 192                 * bit[9:8] -- bit[7:6] of LDO8(0x17)
 193                 * bit[7:6] -- bit[7:6] of LDO7(0x16)
 194                 * bit[5:4] -- bit[7:6] of LDO6(0x15)
 195                 * bit[3:0] -- bit[7:4] of LDO5(0x14)
 196                 */
 197                ret = pm860x_bulk_read(info->i2c, PM8607_LDO5, 5, buf);
 198                if (ret < 0)
 199                        return ret;
 200                ret = ((buf[4] >> 6) << 10) | ((buf[3] >> 6) << 8)
 201                    | ((buf[2] >> 6) << 6) | ((buf[1] >> 6) << 4)
 202                    | (buf[0] >> 4);
 203                /* V_BATT_MEAS(mV) = data * 3 * 1.8 * 1000 / (2^12) */
 204                *data = ((*data & 0xff) * 27 * 25) >> 9;
 205                break;
 206        default:
 207                return -EINVAL;
 208        }
 209        return 0;
 210}
 211
 212/*
 213 * Return value is signed data.
 214 * Negative value means discharging, and positive value means charging.
 215 */
 216static int measure_current(struct pm860x_battery_info *info, int *data)
 217{
 218        unsigned char buf[2];
 219        short s;
 220        int ret;
 221
 222        ret = pm860x_bulk_read(info->i2c, PM8607_IBAT_MEAS1, 2, buf);
 223        if (ret < 0)
 224                return ret;
 225
 226        s = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff);
 227        /* current(mA) = value * 0.125 */
 228        *data = s >> 3;
 229        return 0;
 230}
 231
 232static int set_charger_current(struct pm860x_battery_info *info, int data,
 233                               int *old)
 234{
 235        int ret;
 236
 237        if (data < 50 || data > 1600 || !old)
 238                return -EINVAL;
 239
 240        data = ((data - 50) / 50) & 0x1f;
 241        *old = pm860x_reg_read(info->i2c, PM8607_CHG_CTRL2);
 242        *old = (*old & 0x1f) * 50 + 50;
 243        ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL2, 0x1f, data);
 244        if (ret < 0)
 245                return ret;
 246        return 0;
 247}
 248
 249static int read_ccnt(struct pm860x_battery_info *info, int offset,
 250                     int *ccnt)
 251{
 252        unsigned char buf[2];
 253        int ret;
 254
 255        ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7, offset & 7);
 256        if (ret < 0)
 257                goto out;
 258        ret = pm860x_bulk_read(info->i2c, PM8607_CCNT_MEAS1, 2, buf);
 259        if (ret < 0)
 260                goto out;
 261        *ccnt = ((buf[0] & 0xff) << 8) | (buf[1] & 0xff);
 262        return 0;
 263out:
 264        return ret;
 265}
 266
 267static int calc_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt)
 268{
 269        unsigned int sum;
 270        int ret;
 271        int data;
 272
 273        ret = read_ccnt(info, CCNT_POS1, &data);
 274        if (ret)
 275                goto out;
 276        sum = data & 0xffff;
 277        ret = read_ccnt(info, CCNT_POS2, &data);
 278        if (ret)
 279                goto out;
 280        sum |= (data & 0xffff) << 16;
 281        ccnt->pos += sum;
 282
 283        ret = read_ccnt(info, CCNT_NEG1, &data);
 284        if (ret)
 285                goto out;
 286        sum = data & 0xffff;
 287        ret = read_ccnt(info, CCNT_NEG2, &data);
 288        if (ret)
 289                goto out;
 290        sum |= (data & 0xffff) << 16;
 291        sum = ~sum + 1;         /* since it's negative */
 292        ccnt->neg += sum;
 293
 294        ret = read_ccnt(info, CCNT_SPOS, &data);
 295        if (ret)
 296                goto out;
 297        ccnt->spos += data;
 298        ret = read_ccnt(info, CCNT_SNEG, &data);
 299        if (ret)
 300                goto out;
 301
 302        /*
 303         * charge(mAh)  = count * 1.6984 * 1e(-8)
 304         *              = count * 16984 * 1.024 * 1.024 * 1.024 / (2 ^ 40)
 305         *              = count * 18236 / (2 ^ 40)
 306         */
 307        ccnt->total_chg = (int) ((ccnt->pos * 18236) >> 40);
 308        ccnt->total_dischg = (int) ((ccnt->neg * 18236) >> 40);
 309        return 0;
 310out:
 311        return ret;
 312}
 313
 314static int clear_ccnt(struct pm860x_battery_info *info, struct ccnt *ccnt)
 315{
 316        int data;
 317
 318        memset(ccnt, 0, sizeof(*ccnt));
 319        /* read to clear ccnt */
 320        read_ccnt(info, CCNT_POS1, &data);
 321        read_ccnt(info, CCNT_POS2, &data);
 322        read_ccnt(info, CCNT_NEG1, &data);
 323        read_ccnt(info, CCNT_NEG2, &data);
 324        read_ccnt(info, CCNT_SPOS, &data);
 325        read_ccnt(info, CCNT_SNEG, &data);
 326        return 0;
 327}
 328
 329/* Calculate Open Circuit Voltage */
 330static int calc_ocv(struct pm860x_battery_info *info, int *ocv)
 331{
 332        int ret;
 333        int i;
 334        int data;
 335        int vbatt_avg;
 336        int vbatt_sum;
 337        int ibatt_avg;
 338        int ibatt_sum;
 339
 340        if (!ocv)
 341                return -EINVAL;
 342
 343        for (i = 0, ibatt_sum = 0, vbatt_sum = 0; i < 10; i++) {
 344                ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 345                if (ret)
 346                        goto out;
 347                vbatt_sum += data;
 348                ret = measure_current(info, &data);
 349                if (ret)
 350                        goto out;
 351                ibatt_sum += data;
 352        }
 353        vbatt_avg = vbatt_sum / 10;
 354        ibatt_avg = ibatt_sum / 10;
 355
 356        mutex_lock(&info->lock);
 357        if (info->present)
 358                *ocv = vbatt_avg - ibatt_avg * info->resistor / 1000;
 359        else
 360                *ocv = vbatt_avg;
 361        mutex_unlock(&info->lock);
 362        dev_dbg(info->dev, "VBAT average:%d, OCV:%d\n", vbatt_avg, *ocv);
 363        return 0;
 364out:
 365        return ret;
 366}
 367
 368/* Calculate State of Charge (percent points) */
 369static int calc_soc(struct pm860x_battery_info *info, int state, int *soc)
 370{
 371        int i;
 372        int ocv;
 373        int count;
 374        int ret = -EINVAL;
 375
 376        if (!soc)
 377                return -EINVAL;
 378
 379        switch (state) {
 380        case OCV_MODE_ACTIVE:
 381                ret = calc_ocv(info, &ocv);
 382                break;
 383        case OCV_MODE_SLEEP:
 384                ret = measure_vbatt(info, OCV_MODE_SLEEP, &ocv);
 385                break;
 386        }
 387        if (ret)
 388                return ret;
 389
 390        count = ARRAY_SIZE(array_soc);
 391        if (ocv < array_soc[count - 1][0]) {
 392                *soc = 0;
 393                return 0;
 394        }
 395
 396        for (i = 0; i < count; i++) {
 397                if (ocv >= array_soc[i][0]) {
 398                        *soc = array_soc[i][1];
 399                        break;
 400                }
 401        }
 402        return 0;
 403}
 404
 405static irqreturn_t pm860x_coulomb_handler(int irq, void *data)
 406{
 407        struct pm860x_battery_info *info = data;
 408
 409        calc_ccnt(info, &ccnt_data);
 410        return IRQ_HANDLED;
 411}
 412
 413static irqreturn_t pm860x_batt_handler(int irq, void *data)
 414{
 415        struct pm860x_battery_info *info = data;
 416        int ret;
 417
 418        mutex_lock(&info->lock);
 419        ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
 420        if (ret & STATUS2_BAT) {
 421                info->present = 1;
 422                info->temp_type = PM860X_TEMP_TBAT;
 423        } else {
 424                info->present = 0;
 425                info->temp_type = PM860X_TEMP_TINT;
 426        }
 427        mutex_unlock(&info->lock);
 428        /* clear ccnt since battery is attached or dettached */
 429        clear_ccnt(info, &ccnt_data);
 430        return IRQ_HANDLED;
 431}
 432
 433static void pm860x_init_battery(struct pm860x_battery_info *info)
 434{
 435        unsigned char buf[2];
 436        int ret;
 437        int data;
 438        int bat_remove;
 439        int soc;
 440
 441        /* measure enable on GPADC1 */
 442        data = MEAS1_GP1;
 443        if (info->temp_type == PM860X_TEMP_TINT)
 444                data |= MEAS1_TINT;
 445        ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN1, data, data);
 446        if (ret)
 447                goto out;
 448
 449        /* measure enable on IBAT, BAT_DET, CC. IBAT is depend on CC. */
 450        data = MEAS3_IBAT | MEAS3_BAT_DET | MEAS3_CC;
 451        ret = pm860x_set_bits(info->i2c, PM8607_MEAS_EN3, data, data);
 452        if (ret)
 453                goto out;
 454
 455        /* measure disable CC in sleep time  */
 456        ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME1, 0x82);
 457        if (ret)
 458                goto out;
 459        ret = pm860x_reg_write(info->i2c, PM8607_MEAS_OFF_TIME2, 0x6c);
 460        if (ret)
 461                goto out;
 462
 463        /* enable GPADC */
 464        ret = pm860x_set_bits(info->i2c, PM8607_GPADC_MISC1,
 465                            GPMISC1_GPADC_EN, GPMISC1_GPADC_EN);
 466        if (ret < 0)
 467                goto out;
 468
 469        /* detect battery via GPADC1 */
 470        ret = pm860x_set_bits(info->i2c, PM8607_CHG_CTRL6,
 471                            CC6_BAT_DET_GPADC1, CC6_BAT_DET_GPADC1);
 472        if (ret < 0)
 473                goto out;
 474
 475        ret = pm860x_set_bits(info->i2c, PM8607_CCNT, 7 << 3,
 476                              CCNT_AVG_SEL);
 477        if (ret < 0)
 478                goto out;
 479
 480        /* set GPADC1 bias */
 481        ret = pm860x_set_bits(info->i2c, PM8607_GP_BIAS2, 0xF << 4,
 482                              GPBIAS2_GPADC1_SET);
 483        if (ret < 0)
 484                goto out;
 485
 486        /* check whether battery present) */
 487        mutex_lock(&info->lock);
 488        ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
 489        if (ret < 0) {
 490                mutex_unlock(&info->lock);
 491                goto out;
 492        }
 493        if (ret & STATUS2_BAT) {
 494                info->present = 1;
 495                info->temp_type = PM860X_TEMP_TBAT;
 496        } else {
 497                info->present = 0;
 498                info->temp_type = PM860X_TEMP_TINT;
 499        }
 500        mutex_unlock(&info->lock);
 501
 502        calc_soc(info, OCV_MODE_ACTIVE, &soc);
 503
 504        data = pm860x_reg_read(info->i2c, PM8607_POWER_UP_LOG);
 505        bat_remove = data & BAT_WU_LOG;
 506
 507        dev_dbg(info->dev, "battery wake up? %s\n",
 508                bat_remove != 0 ? "yes" : "no");
 509
 510        /* restore SOC from RTC domain register */
 511        if (bat_remove == 0) {
 512                buf[0] = pm860x_reg_read(info->i2c, PM8607_RTC_MISC2);
 513                buf[1] = pm860x_reg_read(info->i2c, PM8607_RTC1);
 514                data = ((buf[1] & 0x3) << 5) | ((buf[0] >> 3) & 0x1F);
 515                if (data > soc + 15)
 516                        info->start_soc = soc;
 517                else if (data < soc - 15)
 518                        info->start_soc = soc;
 519                else
 520                        info->start_soc = data;
 521                dev_dbg(info->dev, "soc_rtc %d, soc_ocv :%d\n", data, soc);
 522        } else {
 523                pm860x_set_bits(info->i2c, PM8607_POWER_UP_LOG,
 524                                BAT_WU_LOG, BAT_WU_LOG);
 525                info->start_soc = soc;
 526        }
 527        info->last_capacity = info->start_soc;
 528        dev_dbg(info->dev, "init soc : %d\n", info->last_capacity);
 529out:
 530        return;
 531}
 532
 533static void set_temp_threshold(struct pm860x_battery_info *info,
 534                               int min, int max)
 535{
 536        int data;
 537
 538        /* (tmp << 8) / 1800 */
 539        if (min <= 0)
 540                data = 0;
 541        else
 542                data = (min << 8) / 1800;
 543        pm860x_reg_write(info->i2c, PM8607_GPADC1_HIGHTH, data);
 544        dev_dbg(info->dev, "TEMP_HIGHTH : min: %d, 0x%x\n", min, data);
 545
 546        if (max <= 0)
 547                data = 0xff;
 548        else
 549                data = (max << 8) / 1800;
 550        pm860x_reg_write(info->i2c, PM8607_GPADC1_LOWTH, data);
 551        dev_dbg(info->dev, "TEMP_LOWTH:max : %d, 0x%x\n", max, data);
 552}
 553
 554static int measure_temp(struct pm860x_battery_info *info, int *data)
 555{
 556        int ret;
 557        int temp;
 558        int min;
 559        int max;
 560
 561        if (info->temp_type == PM860X_TEMP_TINT) {
 562                ret = measure_12bit_voltage(info, PM8607_TINT_MEAS1, data);
 563                if (ret)
 564                        return ret;
 565                *data = (*data - 884) * 1000 / 3611;
 566        } else {
 567                ret = measure_12bit_voltage(info, PM8607_GPADC1_MEAS1, data);
 568                if (ret)
 569                        return ret;
 570                /* meausered Vtbat(mV) / Ibias_current(11uA)*/
 571                *data = (*data * 1000) / GPBIAS2_GPADC1_UA;
 572
 573                if (*data > TBAT_NEG_25D) {
 574                        temp = -30;     /* over cold , suppose -30 roughly */
 575                        max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 576                        set_temp_threshold(info, 0, max);
 577                } else if (*data > TBAT_NEG_10D) {
 578                        temp = -15;     /* -15 degree, code */
 579                        max = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 580                        set_temp_threshold(info, 0, max);
 581                } else if (*data > TBAT_0D) {
 582                        temp = -5;      /* -5 degree */
 583                        min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 584                        max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 585                        set_temp_threshold(info, min, max);
 586                } else if (*data > TBAT_10D) {
 587                        temp = 5;       /* in range of (0, 10) */
 588                        min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 589                        max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 590                        set_temp_threshold(info, min, max);
 591                } else if (*data > TBAT_20D) {
 592                        temp = 15;      /* in range of (10, 20) */
 593                        min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 594                        max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 595                        set_temp_threshold(info, min, max);
 596                } else if (*data > TBAT_30D) {
 597                        temp = 25;      /* in range of (20, 30) */
 598                        min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 599                        max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 600                        set_temp_threshold(info, min, max);
 601                } else if (*data > TBAT_40D) {
 602                        temp = 35;      /* in range of (30, 40) */
 603                        min = TBAT_NEG_10D * GPBIAS2_GPADC1_UA / 1000;
 604                        max = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 605                        set_temp_threshold(info, min, max);
 606                } else {
 607                        min = TBAT_40D * GPBIAS2_GPADC1_UA / 1000;
 608                        set_temp_threshold(info, min, 0);
 609                        temp = 45;      /* over heat ,suppose 45 roughly */
 610                }
 611
 612                dev_dbg(info->dev, "temp_C:%d C,temp_mv:%d mv\n", temp, *data);
 613                *data = temp;
 614        }
 615        return 0;
 616}
 617
 618static int calc_resistor(struct pm860x_battery_info *info)
 619{
 620        int vbatt_sum1;
 621        int vbatt_sum2;
 622        int chg_current;
 623        int ibatt_sum1;
 624        int ibatt_sum2;
 625        int data;
 626        int ret;
 627        int i;
 628
 629        ret = measure_current(info, &data);
 630        /* make sure that charging is launched by data > 0 */
 631        if (ret || data < 0)
 632                goto out;
 633
 634        ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 635        if (ret)
 636                goto out;
 637        /* calculate resistor only in CC charge mode */
 638        if (data < VBATT_RESISTOR_MIN || data > VBATT_RESISTOR_MAX)
 639                goto out;
 640
 641        /* current is saved */
 642        if (set_charger_current(info, 500, &chg_current))
 643                goto out;
 644
 645        /*
 646         * set charge current as 500mA, wait about 500ms till charging
 647         * process is launched and stable with the newer charging current.
 648         */
 649        msleep(500);
 650
 651        for (i = 0, vbatt_sum1 = 0, ibatt_sum1 = 0; i < 10; i++) {
 652                ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 653                if (ret)
 654                        goto out_meas;
 655                vbatt_sum1 += data;
 656                ret = measure_current(info, &data);
 657                if (ret)
 658                        goto out_meas;
 659
 660                if (data < 0)
 661                        ibatt_sum1 = ibatt_sum1 - data; /* discharging */
 662                else
 663                        ibatt_sum1 = ibatt_sum1 + data; /* charging */
 664        }
 665
 666        if (set_charger_current(info, 100, &ret))
 667                goto out_meas;
 668        /*
 669         * set charge current as 100mA, wait about 500ms till charging
 670         * process is launched and stable with the newer charging current.
 671         */
 672        msleep(500);
 673
 674        for (i = 0, vbatt_sum2 = 0, ibatt_sum2 = 0; i < 10; i++) {
 675                ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 676                if (ret)
 677                        goto out_meas;
 678                vbatt_sum2 += data;
 679                ret = measure_current(info, &data);
 680                if (ret)
 681                        goto out_meas;
 682
 683                if (data < 0)
 684                        ibatt_sum2 = ibatt_sum2 - data; /* discharging */
 685                else
 686                        ibatt_sum2 = ibatt_sum2 + data; /* charging */
 687        }
 688
 689        /* restore current setting */
 690        if (set_charger_current(info, chg_current, &ret))
 691                goto out_meas;
 692
 693        if ((vbatt_sum1 > vbatt_sum2) && (ibatt_sum1 > ibatt_sum2) &&
 694                        (ibatt_sum2 > 0)) {
 695                /* calculate resistor in discharging case */
 696                data = 1000 * (vbatt_sum1 - vbatt_sum2)
 697                    / (ibatt_sum1 - ibatt_sum2);
 698                if ((data - info->resistor > 0) &&
 699                                (data - info->resistor < info->resistor))
 700                        info->resistor = data;
 701                if ((info->resistor - data > 0) &&
 702                                (info->resistor - data < data))
 703                        info->resistor = data;
 704        }
 705        return 0;
 706
 707out_meas:
 708        set_charger_current(info, chg_current, &ret);
 709out:
 710        return -EINVAL;
 711}
 712
 713static int calc_capacity(struct pm860x_battery_info *info, int *cap)
 714{
 715        int ret;
 716        int data;
 717        int ibat;
 718        int cap_ocv = 0;
 719        int cap_cc = 0;
 720
 721        ret = calc_ccnt(info, &ccnt_data);
 722        if (ret)
 723                goto out;
 724soc:
 725        data = info->max_capacity * info->start_soc / 100;
 726        if (ccnt_data.total_dischg - ccnt_data.total_chg <= data) {
 727                cap_cc =
 728                    data + ccnt_data.total_chg - ccnt_data.total_dischg;
 729        } else {
 730                clear_ccnt(info, &ccnt_data);
 731                calc_soc(info, OCV_MODE_ACTIVE, &info->start_soc);
 732                dev_dbg(info->dev, "restart soc = %d !\n",
 733                        info->start_soc);
 734                goto soc;
 735        }
 736
 737        cap_cc = cap_cc * 100 / info->max_capacity;
 738        if (cap_cc < 0)
 739                cap_cc = 0;
 740        else if (cap_cc > 100)
 741                cap_cc = 100;
 742
 743        dev_dbg(info->dev, "%s, last cap : %d", __func__,
 744                info->last_capacity);
 745
 746        ret = measure_current(info, &ibat);
 747        if (ret)
 748                goto out;
 749        /* Calculate the capacity when discharging(ibat < 0) */
 750        if (ibat < 0) {
 751                ret = calc_soc(info, OCV_MODE_ACTIVE, &cap_ocv);
 752                if (ret)
 753                        cap_ocv = info->last_capacity;
 754                ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 755                if (ret)
 756                        goto out;
 757                if (data <= LOW_BAT_THRESHOLD) {
 758                        /* choose the lower capacity value to report
 759                         * between vbat and CC when vbat < 3.6v;
 760                         * than 3.6v;
 761                         */
 762                        *cap = min(cap_ocv, cap_cc);
 763                } else {
 764                        /* when detect vbat > 3.6v, but cap_cc < 15,and
 765                         * cap_ocv is 10% larger than cap_cc, we can think
 766                         * CC have some accumulation error, switch to OCV
 767                         * to estimate capacity;
 768                         * */
 769                        if (cap_cc < 15 && cap_ocv - cap_cc > 10)
 770                                *cap = cap_ocv;
 771                        else
 772                                *cap = cap_cc;
 773                }
 774                /* when discharging, make sure current capacity
 775                 * is lower than last*/
 776                if (*cap > info->last_capacity)
 777                        *cap = info->last_capacity;
 778        } else {
 779                *cap = cap_cc;
 780        }
 781        info->last_capacity = *cap;
 782
 783        dev_dbg(info->dev, "%s, cap_ocv:%d cap_cc:%d, cap:%d\n",
 784                (ibat < 0) ? "discharging" : "charging",
 785                 cap_ocv, cap_cc, *cap);
 786        /*
 787         * store the current capacity to RTC domain register,
 788         * after next power up , it will be restored.
 789         */
 790        pm860x_set_bits(info->i2c, PM8607_RTC_MISC2, RTC_SOC_5LSB,
 791                        (*cap & 0x1F) << 3);
 792        pm860x_set_bits(info->i2c, PM8607_RTC1, RTC_SOC_3MSB,
 793                        ((*cap >> 5) & 0x3));
 794        return 0;
 795out:
 796        return ret;
 797}
 798
 799static void pm860x_external_power_changed(struct power_supply *psy)
 800{
 801        struct pm860x_battery_info *info;
 802
 803        info = container_of(psy, struct pm860x_battery_info, battery);
 804        calc_resistor(info);
 805}
 806
 807static int pm860x_batt_get_prop(struct power_supply *psy,
 808                                enum power_supply_property psp,
 809                                union power_supply_propval *val)
 810{
 811        struct pm860x_battery_info *info = dev_get_drvdata(psy->dev->parent);
 812        int data;
 813        int ret;
 814
 815        switch (psp) {
 816        case POWER_SUPPLY_PROP_PRESENT:
 817                val->intval = info->present;
 818                break;
 819        case POWER_SUPPLY_PROP_CAPACITY:
 820                ret = calc_capacity(info, &data);
 821                if (ret)
 822                        return ret;
 823                if (data < 0)
 824                        data = 0;
 825                else if (data > 100)
 826                        data = 100;
 827                /* return 100 if battery is not attached */
 828                if (!info->present)
 829                        data = 100;
 830                val->intval = data;
 831                break;
 832        case POWER_SUPPLY_PROP_TECHNOLOGY:
 833                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 834                break;
 835        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 836                /* return real vbatt Voltage */
 837                ret = measure_vbatt(info, OCV_MODE_ACTIVE, &data);
 838                if (ret)
 839                        return ret;
 840                val->intval = data * 1000;
 841                break;
 842        case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 843                /* return Open Circuit Voltage (not measured voltage) */
 844                ret = calc_ocv(info, &data);
 845                if (ret)
 846                        return ret;
 847                val->intval = data * 1000;
 848                break;
 849        case POWER_SUPPLY_PROP_CURRENT_NOW:
 850                ret = measure_current(info, &data);
 851                if (ret)
 852                        return ret;
 853                val->intval = data;
 854                break;
 855        case POWER_SUPPLY_PROP_TEMP:
 856                if (info->present) {
 857                        ret = measure_temp(info, &data);
 858                        if (ret)
 859                                return ret;
 860                        data *= 10;
 861                } else {
 862                        /* Fake Temp 25C Without Battery */
 863                        data = 250;
 864                }
 865                val->intval = data;
 866                break;
 867        default:
 868                return -ENODEV;
 869        }
 870        return 0;
 871}
 872
 873static int pm860x_batt_set_prop(struct power_supply *psy,
 874                                       enum power_supply_property psp,
 875                                       const union power_supply_propval *val)
 876{
 877        struct pm860x_battery_info *info = dev_get_drvdata(psy->dev->parent);
 878
 879        switch (psp) {
 880        case POWER_SUPPLY_PROP_CHARGE_FULL:
 881                clear_ccnt(info, &ccnt_data);
 882                info->start_soc = 100;
 883                dev_dbg(info->dev, "chg done, update soc = %d\n",
 884                        info->start_soc);
 885                break;
 886        default:
 887                return -EPERM;
 888        }
 889
 890        return 0;
 891}
 892
 893
 894static enum power_supply_property pm860x_batt_props[] = {
 895        POWER_SUPPLY_PROP_PRESENT,
 896        POWER_SUPPLY_PROP_CAPACITY,
 897        POWER_SUPPLY_PROP_TECHNOLOGY,
 898        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 899        POWER_SUPPLY_PROP_VOLTAGE_AVG,
 900        POWER_SUPPLY_PROP_CURRENT_NOW,
 901        POWER_SUPPLY_PROP_TEMP,
 902};
 903
 904static int pm860x_battery_probe(struct platform_device *pdev)
 905{
 906        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 907        struct pm860x_battery_info *info;
 908        struct pm860x_power_pdata *pdata;
 909        int ret;
 910
 911        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 912        if (!info)
 913                return -ENOMEM;
 914
 915        info->irq_cc = platform_get_irq(pdev, 0);
 916        if (info->irq_cc <= 0) {
 917                dev_err(&pdev->dev, "No IRQ resource!\n");
 918                return -EINVAL;
 919        }
 920
 921        info->irq_batt = platform_get_irq(pdev, 1);
 922        if (info->irq_batt <= 0) {
 923                dev_err(&pdev->dev, "No IRQ resource!\n");
 924                return -EINVAL;
 925        }
 926
 927        info->chip = chip;
 928        info->i2c =
 929            (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
 930        info->dev = &pdev->dev;
 931        info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 932        pdata = pdev->dev.platform_data;
 933
 934        mutex_init(&info->lock);
 935        platform_set_drvdata(pdev, info);
 936
 937        pm860x_init_battery(info);
 938
 939        info->battery.name = "battery-monitor";
 940        info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 941        info->battery.properties = pm860x_batt_props;
 942        info->battery.num_properties = ARRAY_SIZE(pm860x_batt_props);
 943        info->battery.get_property = pm860x_batt_get_prop;
 944        info->battery.set_property = pm860x_batt_set_prop;
 945        info->battery.external_power_changed = pm860x_external_power_changed;
 946
 947        if (pdata && pdata->max_capacity)
 948                info->max_capacity = pdata->max_capacity;
 949        else
 950                info->max_capacity = 1500;      /* set default capacity */
 951        if (pdata && pdata->resistor)
 952                info->resistor = pdata->resistor;
 953        else
 954                info->resistor = 300;   /* set default internal resistor */
 955
 956        ret = power_supply_register(&pdev->dev, &info->battery);
 957        if (ret)
 958                return ret;
 959        info->battery.dev->parent = &pdev->dev;
 960
 961        ret = request_threaded_irq(info->irq_cc, NULL,
 962                                pm860x_coulomb_handler, IRQF_ONESHOT,
 963                                "coulomb", info);
 964        if (ret < 0) {
 965                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 966                        info->irq_cc, ret);
 967                goto out_reg;
 968        }
 969
 970        ret = request_threaded_irq(info->irq_batt, NULL, pm860x_batt_handler,
 971                                IRQF_ONESHOT, "battery", info);
 972        if (ret < 0) {
 973                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 974                        info->irq_batt, ret);
 975                goto out_coulomb;
 976        }
 977
 978
 979        return 0;
 980
 981out_coulomb:
 982        free_irq(info->irq_cc, info);
 983out_reg:
 984        power_supply_unregister(&info->battery);
 985        return ret;
 986}
 987
 988static int pm860x_battery_remove(struct platform_device *pdev)
 989{
 990        struct pm860x_battery_info *info = platform_get_drvdata(pdev);
 991
 992        free_irq(info->irq_batt, info);
 993        free_irq(info->irq_cc, info);
 994        power_supply_unregister(&info->battery);
 995        return 0;
 996}
 997
 998#ifdef CONFIG_PM_SLEEP
 999static int pm860x_battery_suspend(struct device *dev)
1000{
1001        struct platform_device *pdev = to_platform_device(dev);
1002        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
1003
1004        if (device_may_wakeup(dev))
1005                chip->wakeup_flag |= 1 << PM8607_IRQ_CC;
1006        return 0;
1007}
1008
1009static int pm860x_battery_resume(struct device *dev)
1010{
1011        struct platform_device *pdev = to_platform_device(dev);
1012        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
1013
1014        if (device_may_wakeup(dev))
1015                chip->wakeup_flag &= ~(1 << PM8607_IRQ_CC);
1016        return 0;
1017}
1018#endif
1019
1020static SIMPLE_DEV_PM_OPS(pm860x_battery_pm_ops,
1021                        pm860x_battery_suspend, pm860x_battery_resume);
1022
1023static struct platform_driver pm860x_battery_driver = {
1024        .driver = {
1025                   .name = "88pm860x-battery",
1026                   .owner = THIS_MODULE,
1027                   .pm = &pm860x_battery_pm_ops,
1028        },
1029        .probe = pm860x_battery_probe,
1030        .remove = pm860x_battery_remove,
1031};
1032module_platform_driver(pm860x_battery_driver);
1033
1034MODULE_DESCRIPTION("Marvell 88PM860x Battery driver");
1035MODULE_LICENSE("GPL");
1036
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