drivers/power/supply/axp288_charger.c

   1 /*
   2  * axp288_charger.c - X-power AXP288 PMIC Charger driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation
   5  * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/notifier.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/property.h>
  27 #include <linux/mfd/axp20x.h>
  28 #include <linux/extcon.h>
  29
  30 #define PS_STAT_VBUS_TRIGGER            (1 << 0)
  31 #define PS_STAT_BAT_CHRG_DIR            (1 << 2)
  32 #define PS_STAT_VBAT_ABOVE_VHOLD        (1 << 3)
  33 #define PS_STAT_VBUS_VALID              (1 << 4)
  34 #define PS_STAT_VBUS_PRESENT            (1 << 5)
  35
  36 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  37 #define CHRG_STAT_BAT_VALID             (1 << 4)
  38 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  39 #define CHRG_STAT_CHARGING              (1 << 6)
  40 #define CHRG_STAT_PMIC_OTP              (1 << 7)
  41
  42 #define VBUS_ISPOUT_CUR_LIM_MASK        0x03
  43 #define VBUS_ISPOUT_CUR_LIM_BIT_POS     0
  44 #define VBUS_ISPOUT_CUR_LIM_900MA       0x0     /* 900mA */
  45 #define VBUS_ISPOUT_CUR_LIM_1500MA      0x1     /* 1500mA */
  46 #define VBUS_ISPOUT_CUR_LIM_2000MA      0x2     /* 2000mA */
  47 #define VBUS_ISPOUT_CUR_NO_LIM          0x3     /* 2500mA */
  48 #define VBUS_ISPOUT_VHOLD_SET_MASK      0x31
  49 #define VBUS_ISPOUT_VHOLD_SET_BIT_POS   0x3
  50 #define VBUS_ISPOUT_VHOLD_SET_OFFSET    4000    /* 4000mV */
  51 #define VBUS_ISPOUT_VHOLD_SET_LSB_RES   100     /* 100mV */
  52 #define VBUS_ISPOUT_VHOLD_SET_4300MV    0x3     /* 4300mV */
  53 #define VBUS_ISPOUT_VBUS_PATH_DIS       (1 << 7)
  54
  55 #define CHRG_CCCV_CC_MASK               0xf             /* 4 bits */
  56 #define CHRG_CCCV_CC_BIT_POS            0
  57 #define CHRG_CCCV_CC_OFFSET             200             /* 200mA */
  58 #define CHRG_CCCV_CC_LSB_RES            200             /* 200mA */
  59 #define CHRG_CCCV_ITERM_20P             (1 << 4)        /* 20% of CC */
  60 #define CHRG_CCCV_CV_MASK               0x60            /* 2 bits */
  61 #define CHRG_CCCV_CV_BIT_POS            5
  62 #define CHRG_CCCV_CV_4100MV             0x0             /* 4.10V */
  63 #define CHRG_CCCV_CV_4150MV             0x1             /* 4.15V */
  64 #define CHRG_CCCV_CV_4200MV             0x2             /* 4.20V */
  65 #define CHRG_CCCV_CV_4350MV             0x3             /* 4.35V */
  66 #define CHRG_CCCV_CHG_EN                (1 << 7)
  67
  68 #define CNTL2_CC_TIMEOUT_MASK           0x3     /* 2 bits */
  69 #define CNTL2_CC_TIMEOUT_OFFSET         6       /* 6 Hrs */
  70 #define CNTL2_CC_TIMEOUT_LSB_RES        2       /* 2 Hrs */
  71 #define CNTL2_CC_TIMEOUT_12HRS          0x3     /* 12 Hrs */
  72 #define CNTL2_CHGLED_TYPEB              (1 << 4)
  73 #define CNTL2_CHG_OUT_TURNON            (1 << 5)
  74 #define CNTL2_PC_TIMEOUT_MASK           0xC0
  75 #define CNTL2_PC_TIMEOUT_OFFSET         40      /* 40 mins */
  76 #define CNTL2_PC_TIMEOUT_LSB_RES        10      /* 10 mins */
  77 #define CNTL2_PC_TIMEOUT_70MINS         0x3
  78
  79 #define CHRG_ILIM_TEMP_LOOP_EN          (1 << 3)
  80 #define CHRG_VBUS_ILIM_MASK             0xf0
  81 #define CHRG_VBUS_ILIM_BIT_POS          4
  82 #define CHRG_VBUS_ILIM_100MA            0x0     /* 100mA */
  83 #define CHRG_VBUS_ILIM_500MA            0x1     /* 500mA */
  84 #define CHRG_VBUS_ILIM_900MA            0x2     /* 900mA */
  85 #define CHRG_VBUS_ILIM_1500MA           0x3     /* 1500mA */
  86 #define CHRG_VBUS_ILIM_2000MA           0x4     /* 2000mA */
  87 #define CHRG_VBUS_ILIM_2500MA           0x5     /* 2500mA */
  88 #define CHRG_VBUS_ILIM_3000MA           0x6     /* 3000mA */
  89
  90 #define CHRG_VLTFC_0C                   0xA5    /* 0 DegC */
  91 #define CHRG_VHTFC_45C                  0x1F    /* 45 DegC */
  92
  93 #define BAT_IRQ_CFG_CHRG_DONE           (1 << 2)
  94 #define BAT_IRQ_CFG_CHRG_START          (1 << 3)
  95 #define BAT_IRQ_CFG_BAT_SAFE_EXIT       (1 << 4)
  96 #define BAT_IRQ_CFG_BAT_SAFE_ENTER      (1 << 5)
  97 #define BAT_IRQ_CFG_BAT_DISCON          (1 << 6)
  98 #define BAT_IRQ_CFG_BAT_CONN            (1 << 7)
  99 #define BAT_IRQ_CFG_BAT_MASK            0xFC
 100
 101 #define TEMP_IRQ_CFG_QCBTU              (1 << 4)
 102 #define TEMP_IRQ_CFG_CBTU               (1 << 5)
 103 #define TEMP_IRQ_CFG_QCBTO              (1 << 6)
 104 #define TEMP_IRQ_CFG_CBTO               (1 << 7)
 105 #define TEMP_IRQ_CFG_MASK               0xF0
 106
 107 #define FG_CNTL_OCV_ADJ_EN              (1 << 3)
 108
 109 #define CV_4100MV                       4100    /* 4100mV */
 110 #define CV_4150MV                       4150    /* 4150mV */
 111 #define CV_4200MV                       4200    /* 4200mV */
 112 #define CV_4350MV                       4350    /* 4350mV */
 113
 114 #define CC_200MA                        200     /*  200mA */
 115 #define CC_600MA                        600     /*  600mA */
 116 #define CC_800MA                        800     /*  800mA */
 117 #define CC_1000MA                       1000    /* 1000mA */
 118 #define CC_1600MA                       1600    /* 1600mA */
 119 #define CC_2000MA                       2000    /* 2000mA */
 120
 121 #define ILIM_100MA                      100     /* 100mA */
 122 #define ILIM_500MA                      500     /* 500mA */
 123 #define ILIM_900MA                      900     /* 900mA */
 124 #define ILIM_1500MA                     1500    /* 1500mA */
 125 #define ILIM_2000MA                     2000    /* 2000mA */
 126 #define ILIM_2500MA                     2500    /* 2500mA */
 127 #define ILIM_3000MA                     3000    /* 3000mA */
 128
 129 #define AXP288_EXTCON_DEV_NAME          "axp288_extcon"
 130
 131 enum {
 132         VBUS_OV_IRQ = 0,
 133         CHARGE_DONE_IRQ,
 134         CHARGE_CHARGING_IRQ,
 135         BAT_SAFE_QUIT_IRQ,
 136         BAT_SAFE_ENTER_IRQ,
 137         QCBTU_IRQ,
 138         CBTU_IRQ,
 139         QCBTO_IRQ,
 140         CBTO_IRQ,
 141         CHRG_INTR_END,
 142 };
 143
 144 struct axp288_chrg_info {
 145         struct platform_device *pdev;
 146         struct axp20x_chrg_pdata *pdata;
 147         struct regmap *regmap;
 148         struct regmap_irq_chip_data *regmap_irqc;
 149         int irq[CHRG_INTR_END];
 150         struct power_supply *psy_usb;
 151         struct mutex lock;
 152
 153         /* OTG/Host mode */
 154         struct {
 155                 struct work_struct work;
 156                 struct extcon_dev *cable;
 157                 struct notifier_block id_nb;
 158                 bool id_short;
 159         } otg;
 160
 161         /* SDP/CDP/DCP USB charging cable notifications */
 162         struct {
 163                 struct extcon_dev *edev;
 164                 bool connected;
 165                 enum power_supply_type chg_type;
 166                 struct notifier_block nb;
 167                 struct work_struct work;
 168         } cable;
 169
 170         int health;
 171         int inlmt;
 172         int cc;
 173         int cv;
 174         int max_cc;
 175         int max_cv;
 176         bool online;
 177         bool present;
 178         bool enable_charger;
 179         bool is_charger_enabled;
 180 };
 181
 182 static inline int axp288_charger_set_cc(struct axp288_chrg_info *info, int cc)
 183 {
 184         u8 reg_val;
 185         int ret;
 186
 187         if (cc < CHRG_CCCV_CC_OFFSET)
 188                 cc = CHRG_CCCV_CC_OFFSET;
 189         else if (cc > info->max_cc)
 190                 cc = info->max_cc;
 191
 192         reg_val = (cc - CHRG_CCCV_CC_OFFSET) / CHRG_CCCV_CC_LSB_RES;
 193         cc = (reg_val * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 194         reg_val = reg_val << CHRG_CCCV_CC_BIT_POS;
 195
 196         ret = regmap_update_bits(info->regmap,
 197                                 AXP20X_CHRG_CTRL1,
 198                                 CHRG_CCCV_CC_MASK, reg_val);
 199         if (ret >= 0)
 200                 info->cc = cc;
 201
 202         return ret;
 203 }
 204
 205 static inline int axp288_charger_set_cv(struct axp288_chrg_info *info, int cv)
 206 {
 207         u8 reg_val;
 208         int ret;
 209
 210         if (cv <= CV_4100MV) {
 211                 reg_val = CHRG_CCCV_CV_4100MV;
 212                 cv = CV_4100MV;
 213         } else if (cv <= CV_4150MV) {
 214                 reg_val = CHRG_CCCV_CV_4150MV;
 215                 cv = CV_4150MV;
 216         } else if (cv <= CV_4200MV) {
 217                 reg_val = CHRG_CCCV_CV_4200MV;
 218                 cv = CV_4200MV;
 219         } else {
 220                 reg_val = CHRG_CCCV_CV_4350MV;
 221                 cv = CV_4350MV;
 222         }
 223
 224         reg_val = reg_val << CHRG_CCCV_CV_BIT_POS;
 225
 226         ret = regmap_update_bits(info->regmap,
 227                                 AXP20X_CHRG_CTRL1,
 228                                 CHRG_CCCV_CV_MASK, reg_val);
 229
 230         if (ret >= 0)
 231                 info->cv = cv;
 232
 233         return ret;
 234 }
 235
 236 static inline int axp288_charger_set_vbus_inlmt(struct axp288_chrg_info *info,
 237                                            int inlmt)
 238 {
 239         int ret;
 240         unsigned int val;
 241         u8 reg_val;
 242
 243         /* Read in limit register */
 244         ret = regmap_read(info->regmap, AXP20X_CHRG_BAK_CTRL, &val);
 245         if (ret < 0)
 246                 goto set_inlmt_fail;
 247
 248         if (inlmt <= ILIM_100MA) {
 249                 reg_val = CHRG_VBUS_ILIM_100MA;
 250                 inlmt = ILIM_100MA;
 251         } else if (inlmt <= ILIM_500MA) {
 252                 reg_val = CHRG_VBUS_ILIM_500MA;
 253                 inlmt = ILIM_500MA;
 254         } else if (inlmt <= ILIM_900MA) {
 255                 reg_val = CHRG_VBUS_ILIM_900MA;
 256                 inlmt = ILIM_900MA;
 257         } else if (inlmt <= ILIM_1500MA) {
 258                 reg_val = CHRG_VBUS_ILIM_1500MA;
 259                 inlmt = ILIM_1500MA;
 260         } else if (inlmt <= ILIM_2000MA) {
 261                 reg_val = CHRG_VBUS_ILIM_2000MA;
 262                 inlmt = ILIM_2000MA;
 263         } else if (inlmt <= ILIM_2500MA) {
 264                 reg_val = CHRG_VBUS_ILIM_2500MA;
 265                 inlmt = ILIM_2500MA;
 266         } else {
 267                 reg_val = CHRG_VBUS_ILIM_3000MA;
 268                 inlmt = ILIM_3000MA;
 269         }
 270
 271         reg_val = (val & ~CHRG_VBUS_ILIM_MASK)
 272                         | (reg_val << CHRG_VBUS_ILIM_BIT_POS);
 273         ret = regmap_write(info->regmap, AXP20X_CHRG_BAK_CTRL, reg_val);
 274         if (ret >= 0)
 275                 info->inlmt = inlmt;
 276         else
 277                 dev_err(&info->pdev->dev, "charger BAK control %d\n", ret);
 278
 279
 280 set_inlmt_fail:
 281         return ret;
 282 }
 283
 284 static int axp288_charger_vbus_path_select(struct axp288_chrg_info *info,
 285                                                                 bool enable)
 286 {
 287         int ret;
 288
 289         if (enable)
 290                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 291                                         VBUS_ISPOUT_VBUS_PATH_DIS, 0);
 292         else
 293                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 294                         VBUS_ISPOUT_VBUS_PATH_DIS, VBUS_ISPOUT_VBUS_PATH_DIS);
 295
 296         if (ret < 0)
 297                 dev_err(&info->pdev->dev, "axp288 vbus path select %d\n", ret);
 298
 299
 300         return ret;
 301 }
 302
 303 static int axp288_charger_enable_charger(struct axp288_chrg_info *info,
 304                                                                 bool enable)
 305 {
 306         int ret;
 307
 308         if (enable)
 309                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 310                                 CHRG_CCCV_CHG_EN, CHRG_CCCV_CHG_EN);
 311         else
 312                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 313                                 CHRG_CCCV_CHG_EN, 0);
 314         if (ret < 0)
 315                 dev_err(&info->pdev->dev, "axp288 enable charger %d\n", ret);
 316         else
 317                 info->is_charger_enabled = enable;
 318
 319         return ret;
 320 }
 321
 322 static int axp288_charger_is_present(struct axp288_chrg_info *info)
 323 {
 324         int ret, present = 0;
 325         unsigned int val;
 326
 327         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 328         if (ret < 0)
 329                 return ret;
 330
 331         if (val & PS_STAT_VBUS_PRESENT)
 332                 present = 1;
 333         return present;
 334 }
 335
 336 static int axp288_charger_is_online(struct axp288_chrg_info *info)
 337 {
 338         int ret, online = 0;
 339         unsigned int val;
 340
 341         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 342         if (ret < 0)
 343                 return ret;
 344
 345         if (val & PS_STAT_VBUS_VALID)
 346                 online = 1;
 347         return online;
 348 }
 349
 350 static int axp288_get_charger_health(struct axp288_chrg_info *info)
 351 {
 352         int ret, pwr_stat, chrg_stat;
 353         int health = POWER_SUPPLY_HEALTH_UNKNOWN;
 354         unsigned int val;
 355
 356         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 357         if ((ret < 0) || !(val & PS_STAT_VBUS_PRESENT))
 358                 goto health_read_fail;
 359         else
 360                 pwr_stat = val;
 361
 362         ret = regmap_read(info->regmap, AXP20X_PWR_OP_MODE, &val);
 363         if (ret < 0)
 364                 goto health_read_fail;
 365         else
 366                 chrg_stat = val;
 367
 368         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 369                 health = POWER_SUPPLY_HEALTH_DEAD;
 370         else if (chrg_stat & CHRG_STAT_PMIC_OTP)
 371                 health = POWER_SUPPLY_HEALTH_OVERHEAT;
 372         else if (chrg_stat & CHRG_STAT_BAT_SAFE_MODE)
 373                 health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 374         else
 375                 health = POWER_SUPPLY_HEALTH_GOOD;
 376
 377 health_read_fail:
 378         return health;
 379 }
 380
 381 static int axp288_charger_usb_set_property(struct power_supply *psy,
 382                                     enum power_supply_property psp,
 383                                     const union power_supply_propval *val)
 384 {
 385         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 386         int ret = 0;
 387         int scaled_val;
 388
 389         mutex_lock(&info->lock);
 390
 391         switch (psp) {
 392         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 393                 scaled_val = min(val->intval, info->max_cc);
 394                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 395                 ret = axp288_charger_set_cc(info, scaled_val);
 396                 if (ret < 0)
 397                         dev_warn(&info->pdev->dev, "set charge current failed\n");
 398                 break;
 399         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 400                 scaled_val = min(val->intval, info->max_cv);
 401                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 402                 ret = axp288_charger_set_cv(info, scaled_val);
 403                 if (ret < 0)
 404                         dev_warn(&info->pdev->dev, "set charge voltage failed\n");
 405                 break;
 406         default:
 407                 ret = -EINVAL;
 408         }
 409
 410         mutex_unlock(&info->lock);
 411         return ret;
 412 }
 413
 414 static int axp288_charger_usb_get_property(struct power_supply *psy,
 415                                     enum power_supply_property psp,
 416                                     union power_supply_propval *val)
 417 {
 418         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 419         int ret = 0;
 420
 421         mutex_lock(&info->lock);
 422
 423         switch (psp) {
 424         case POWER_SUPPLY_PROP_PRESENT:
 425                 /* Check for OTG case first */
 426                 if (info->otg.id_short) {
 427                         val->intval = 0;
 428                         break;
 429                 }
 430                 ret = axp288_charger_is_present(info);
 431                 if (ret < 0)
 432                         goto psy_get_prop_fail;
 433                 info->present = ret;
 434                 val->intval = info->present;
 435                 break;
 436         case POWER_SUPPLY_PROP_ONLINE:
 437                 /* Check for OTG case first */
 438                 if (info->otg.id_short) {
 439                         val->intval = 0;
 440                         break;
 441                 }
 442                 ret = axp288_charger_is_online(info);
 443                 if (ret < 0)
 444                         goto psy_get_prop_fail;
 445                 info->online = ret;
 446                 val->intval = info->online;
 447                 break;
 448         case POWER_SUPPLY_PROP_HEALTH:
 449                 val->intval = axp288_get_charger_health(info);
 450                 break;
 451         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 452                 val->intval = info->cc * 1000;
 453                 break;
 454         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 455                 val->intval = info->max_cc * 1000;
 456                 break;
 457         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 458                 val->intval = info->cv * 1000;
 459                 break;
 460         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 461                 val->intval = info->max_cv * 1000;
 462                 break;
 463         case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
 464                 val->intval = info->inlmt * 1000;
 465                 break;
 466         default:
 467                 ret = -EINVAL;
 468                 goto psy_get_prop_fail;
 469         }
 470
 471 psy_get_prop_fail:
 472         mutex_unlock(&info->lock);
 473         return ret;
 474 }
 475
 476 static int axp288_charger_property_is_writeable(struct power_supply *psy,
 477                 enum power_supply_property psp)
 478 {
 479         int ret;
 480
 481         switch (psp) {
 482         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 483         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 484                 ret = 1;
 485                 break;
 486         default:
 487                 ret = 0;
 488         }
 489
 490         return ret;
 491 }
 492
 493 static enum power_supply_property axp288_usb_props[] = {
 494         POWER_SUPPLY_PROP_PRESENT,
 495         POWER_SUPPLY_PROP_ONLINE,
 496         POWER_SUPPLY_PROP_TYPE,
 497         POWER_SUPPLY_PROP_HEALTH,
 498         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 499         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 500         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 501         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 502         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
 503 };
 504
 505 static const struct power_supply_desc axp288_charger_desc = {
 506         .name                   = "axp288_charger",
 507         .type                   = POWER_SUPPLY_TYPE_USB,
 508         .properties             = axp288_usb_props,
 509         .num_properties         = ARRAY_SIZE(axp288_usb_props),
 510         .get_property           = axp288_charger_usb_get_property,
 511         .set_property           = axp288_charger_usb_set_property,
 512         .property_is_writeable  = axp288_charger_property_is_writeable,
 513 };
 514
 515 static irqreturn_t axp288_charger_irq_thread_handler(int irq, void *dev)
 516 {
 517         struct axp288_chrg_info *info = dev;
 518         int i;
 519
 520         for (i = 0; i < CHRG_INTR_END; i++) {
 521                 if (info->irq[i] == irq)
 522                         break;
 523         }
 524
 525         if (i >= CHRG_INTR_END) {
 526                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 527                 return IRQ_NONE;
 528         }
 529
 530         switch (i) {
 531         case VBUS_OV_IRQ:
 532                 dev_dbg(&info->pdev->dev, "VBUS Over Voltage INTR\n");
 533                 break;
 534         case CHARGE_DONE_IRQ:
 535                 dev_dbg(&info->pdev->dev, "Charging Done INTR\n");
 536                 break;
 537         case CHARGE_CHARGING_IRQ:
 538                 dev_dbg(&info->pdev->dev, "Start Charging IRQ\n");
 539                 break;
 540         case BAT_SAFE_QUIT_IRQ:
 541                 dev_dbg(&info->pdev->dev,
 542                         "Quit Safe Mode(restart timer) Charging IRQ\n");
 543                 break;
 544         case BAT_SAFE_ENTER_IRQ:
 545                 dev_dbg(&info->pdev->dev,
 546                         "Enter Safe Mode(timer expire) Charging IRQ\n");
 547                 break;
 548         case QCBTU_IRQ:
 549                 dev_dbg(&info->pdev->dev,
 550                         "Quit Battery Under Temperature(CHRG) INTR\n");
 551                 break;
 552         case CBTU_IRQ:
 553                 dev_dbg(&info->pdev->dev,
 554                         "Hit Battery Under Temperature(CHRG) INTR\n");
 555                 break;
 556         case QCBTO_IRQ:
 557                 dev_dbg(&info->pdev->dev,
 558                         "Quit Battery Over Temperature(CHRG) INTR\n");
 559                 break;
 560         case CBTO_IRQ:
 561                 dev_dbg(&info->pdev->dev,
 562                         "Hit Battery Over Temperature(CHRG) INTR\n");
 563                 break;
 564         default:
 565                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 566                 goto out;
 567         }
 568
 569         power_supply_changed(info->psy_usb);
 570 out:
 571         return IRQ_HANDLED;
 572 }
 573
 574 static void axp288_charger_extcon_evt_worker(struct work_struct *work)
 575 {
 576         struct axp288_chrg_info *info =
 577             container_of(work, struct axp288_chrg_info, cable.work);
 578         int ret, current_limit;
 579         bool changed = false;
 580         struct extcon_dev *edev = info->cable.edev;
 581         bool old_connected = info->cable.connected;
 582
 583         /* Determine cable/charger type */
 584         if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_SDP) > 0) {
 585                 dev_dbg(&info->pdev->dev, "USB SDP charger  is connected");
 586                 info->cable.connected = true;
 587                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 588         } else if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_CDP) > 0) {
 589                 dev_dbg(&info->pdev->dev, "USB CDP charger is connected");
 590                 info->cable.connected = true;
 591                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_CDP;
 592         } else if (extcon_get_cable_state_(edev, EXTCON_CHG_USB_DCP) > 0) {
 593                 dev_dbg(&info->pdev->dev, "USB DCP charger is connected");
 594                 info->cable.connected = true;
 595                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_DCP;
 596         } else {
 597                 if (old_connected)
 598                         dev_dbg(&info->pdev->dev, "USB charger disconnected");
 599                 info->cable.connected = false;
 600                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 601         }
 602
 603         /* Cable status changed */
 604         if (old_connected != info->cable.connected)
 605                 changed = true;
 606
 607         if (!changed)
 608                 return;
 609
 610         mutex_lock(&info->lock);
 611
 612         if (info->is_charger_enabled && !info->cable.connected) {
 613                 info->enable_charger = false;
 614                 ret = axp288_charger_enable_charger(info, info->enable_charger);
 615                 if (ret < 0)
 616                         dev_err(&info->pdev->dev,
 617                                 "cannot disable charger (%d)", ret);
 618
 619         } else if (!info->is_charger_enabled && info->cable.connected) {
 620                 switch (info->cable.chg_type) {
 621                 case POWER_SUPPLY_TYPE_USB:
 622                         current_limit = ILIM_500MA;
 623                         break;
 624                 case POWER_SUPPLY_TYPE_USB_CDP:
 625                         current_limit = ILIM_1500MA;
 626                         break;
 627                 case POWER_SUPPLY_TYPE_USB_DCP:
 628                         current_limit = ILIM_2000MA;
 629                         break;
 630                 default:
 631                         /* Unknown */
 632                         current_limit = 0;
 633                         break;
 634                 }
 635
 636                 /* Set vbus current limit first, then enable charger */
 637                 ret = axp288_charger_set_vbus_inlmt(info, current_limit);
 638                 if (ret < 0) {
 639                         dev_err(&info->pdev->dev,
 640                                 "error setting current limit (%d)", ret);
 641                 } else {
 642                         info->enable_charger = (current_limit > 0);
 643                         ret = axp288_charger_enable_charger(info,
 644                                                         info->enable_charger);
 645                         if (ret < 0)
 646                                 dev_err(&info->pdev->dev,
 647                                         "cannot enable charger (%d)", ret);
 648                 }
 649         }
 650
 651         if (changed)
 652                 info->health = axp288_get_charger_health(info);
 653
 654         mutex_unlock(&info->lock);
 655
 656         if (changed)
 657                 power_supply_changed(info->psy_usb);
 658 }
 659
 660 static int axp288_charger_handle_cable_evt(struct notifier_block *nb,
 661                                           unsigned long event, void *param)
 662 {
 663         struct axp288_chrg_info *info =
 664             container_of(nb, struct axp288_chrg_info, cable.nb);
 665
 666         schedule_work(&info->cable.work);
 667
 668         return NOTIFY_OK;
 669 }
 670
 671 static void axp288_charger_otg_evt_worker(struct work_struct *work)
 672 {
 673         struct axp288_chrg_info *info =
 674             container_of(work, struct axp288_chrg_info, otg.work);
 675         int ret;
 676
 677         /* Disable VBUS path before enabling the 5V boost */
 678         ret = axp288_charger_vbus_path_select(info, !info->otg.id_short);
 679         if (ret < 0)
 680                 dev_warn(&info->pdev->dev, "vbus path disable failed\n");
 681 }
 682
 683 static int axp288_charger_handle_otg_evt(struct notifier_block *nb,
 684                                    unsigned long event, void *param)
 685 {
 686         struct axp288_chrg_info *info =
 687             container_of(nb, struct axp288_chrg_info, otg.id_nb);
 688         struct extcon_dev *edev = info->otg.cable;
 689         int usb_host = extcon_get_cable_state_(edev, EXTCON_USB_HOST);
 690
 691         dev_dbg(&info->pdev->dev, "external connector USB-Host is %s\n",
 692                                 usb_host ? "attached" : "detached");
 693
 694         /*
 695          * Set usb_id_short flag to avoid running charger detection logic
 696          * in case usb host.
 697          */
 698         info->otg.id_short = usb_host;
 699         schedule_work(&info->otg.work);
 700
 701         return NOTIFY_OK;
 702 }
 703
 704 static void charger_init_hw_regs(struct axp288_chrg_info *info)
 705 {
 706         int ret, cc, cv;
 707         unsigned int val;
 708
 709         /* Program temperature thresholds */
 710         ret = regmap_write(info->regmap, AXP20X_V_LTF_CHRG, CHRG_VLTFC_0C);
 711         if (ret < 0)
 712                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 713                                                         AXP20X_V_LTF_CHRG, ret);
 714
 715         ret = regmap_write(info->regmap, AXP20X_V_HTF_CHRG, CHRG_VHTFC_45C);
 716         if (ret < 0)
 717                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 718                                                         AXP20X_V_HTF_CHRG, ret);
 719
 720         /* Do not turn-off charger o/p after charge cycle ends */
 721         ret = regmap_update_bits(info->regmap,
 722                                 AXP20X_CHRG_CTRL2,
 723                                 CNTL2_CHG_OUT_TURNON, 1);
 724         if (ret < 0)
 725                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 726                                                 AXP20X_CHRG_CTRL2, ret);
 727
 728         /* Enable interrupts */
 729         ret = regmap_update_bits(info->regmap,
 730                                 AXP20X_IRQ2_EN,
 731                                 BAT_IRQ_CFG_BAT_MASK, 1);
 732         if (ret < 0)
 733                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 734                                                 AXP20X_IRQ2_EN, ret);
 735
 736         ret = regmap_update_bits(info->regmap, AXP20X_IRQ3_EN,
 737                                 TEMP_IRQ_CFG_MASK, 1);
 738         if (ret < 0)
 739                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 740                                                 AXP20X_IRQ3_EN, ret);
 741
 742         /* Setup ending condition for charging to be 10% of I(chrg) */
 743         ret = regmap_update_bits(info->regmap,
 744                                 AXP20X_CHRG_CTRL1,
 745                                 CHRG_CCCV_ITERM_20P, 0);
 746         if (ret < 0)
 747                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 748                                                 AXP20X_CHRG_CTRL1, ret);
 749
 750         /* Disable OCV-SOC curve calibration */
 751         ret = regmap_update_bits(info->regmap,
 752                                 AXP20X_CC_CTRL,
 753                                 FG_CNTL_OCV_ADJ_EN, 0);
 754         if (ret < 0)
 755                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 756                                                 AXP20X_CC_CTRL, ret);
 757
 758         /* Init charging current and voltage */
 759         info->max_cc = info->pdata->max_cc;
 760         info->max_cv = info->pdata->max_cv;
 761
 762         /* Read current charge voltage and current limit */
 763         ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
 764         if (ret < 0) {
 765                 /* Assume default if cannot read */
 766                 info->cc = info->pdata->def_cc;
 767                 info->cv = info->pdata->def_cv;
 768         } else {
 769                 /* Determine charge voltage */
 770                 cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
 771                 switch (cv) {
 772                 case CHRG_CCCV_CV_4100MV:
 773                         info->cv = CV_4100MV;
 774                         break;
 775                 case CHRG_CCCV_CV_4150MV:
 776                         info->cv = CV_4150MV;
 777                         break;
 778                 case CHRG_CCCV_CV_4200MV:
 779                         info->cv = CV_4200MV;
 780                         break;
 781                 case CHRG_CCCV_CV_4350MV:
 782                         info->cv = CV_4350MV;
 783                         break;
 784                 default:
 785                         info->cv = INT_MAX;
 786                         break;
 787                 }
 788
 789                 /* Determine charge current limit */
 790                 cc = (ret & CHRG_CCCV_CC_MASK) >> CHRG_CCCV_CC_BIT_POS;
 791                 cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 792                 info->cc = cc;
 793
 794                 /* Program default charging voltage and current */
 795                 cc = min(info->pdata->def_cc, info->max_cc);
 796                 cv = min(info->pdata->def_cv, info->max_cv);
 797
 798                 ret = axp288_charger_set_cc(info, cc);
 799                 if (ret < 0)
 800                         dev_warn(&info->pdev->dev,
 801                                         "error(%d) in setting CC\n", ret);
 802
 803                 ret = axp288_charger_set_cv(info, cv);
 804                 if (ret < 0)
 805                         dev_warn(&info->pdev->dev,
 806                                         "error(%d) in setting CV\n", ret);
 807         }
 808 }
 809
 810 static int axp288_charger_probe(struct platform_device *pdev)
 811 {
 812         int ret, i, pirq;
 813         struct axp288_chrg_info *info;
 814         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 815         struct power_supply_config charger_cfg = {};
 816
 817         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 818         if (!info)
 819                 return -ENOMEM;
 820
 821         info->pdev = pdev;
 822         info->regmap = axp20x->regmap;
 823         info->regmap_irqc = axp20x->regmap_irqc;
 824         info->pdata = pdev->dev.platform_data;
 825
 826         if (!info->pdata) {
 827                 /* Try ACPI provided pdata via device properties */
 828                 if (!device_property_present(&pdev->dev,
 829                                                 "axp288_charger_data\n"))
 830                         dev_err(&pdev->dev, "failed to get platform data\n");
 831                 return -ENODEV;
 832         }
 833
 834         info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
 835         if (info->cable.edev == NULL) {
 836                 dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
 837                         AXP288_EXTCON_DEV_NAME);
 838                 return -EPROBE_DEFER;
 839         }
 840
 841         /* Register for extcon notification */
 842         INIT_WORK(&info->cable.work, axp288_charger_extcon_evt_worker);
 843         info->cable.nb.notifier_call = axp288_charger_handle_cable_evt;
 844         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 845                                         &info->cable.nb);
 846         if (ret) {
 847                 dev_err(&info->pdev->dev,
 848                         "failed to register extcon notifier for SDP %d\n", ret);
 849                 return ret;
 850         }
 851
 852         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 853                                         &info->cable.nb);
 854         if (ret) {
 855                 dev_err(&info->pdev->dev,
 856                         "failed to register extcon notifier for CDP %d\n", ret);
 857                 extcon_unregister_notifier(info->cable.edev,
 858                                 EXTCON_CHG_USB_SDP, &info->cable.nb);
 859                 return ret;
 860         }
 861
 862         ret = extcon_register_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 863                                         &info->cable.nb);
 864         if (ret) {
 865                 dev_err(&info->pdev->dev,
 866                         "failed to register extcon notifier for DCP %d\n", ret);
 867                 extcon_unregister_notifier(info->cable.edev,
 868                                 EXTCON_CHG_USB_SDP, &info->cable.nb);
 869                 extcon_unregister_notifier(info->cable.edev,
 870                                 EXTCON_CHG_USB_CDP, &info->cable.nb);
 871                 return ret;
 872         }
 873
 874         platform_set_drvdata(pdev, info);
 875         mutex_init(&info->lock);
 876
 877         /* Register with power supply class */
 878         charger_cfg.drv_data = info;
 879         info->psy_usb = power_supply_register(&pdev->dev, &axp288_charger_desc,
 880                                                 &charger_cfg);
 881         if (IS_ERR(info->psy_usb)) {
 882                 dev_err(&pdev->dev, "failed to register power supply charger\n");
 883                 ret = PTR_ERR(info->psy_usb);
 884                 goto psy_reg_failed;
 885         }
 886
 887         /* Register for OTG notification */
 888         INIT_WORK(&info->otg.work, axp288_charger_otg_evt_worker);
 889         info->otg.id_nb.notifier_call = axp288_charger_handle_otg_evt;
 890         ret = extcon_register_notifier(info->otg.cable, EXTCON_USB_HOST,
 891                                        &info->otg.id_nb);
 892         if (ret)
 893                 dev_warn(&pdev->dev, "failed to register otg notifier\n");
 894
 895         if (info->otg.cable)
 896                 info->otg.id_short = extcon_get_cable_state_(
 897                                         info->otg.cable, EXTCON_USB_HOST);
 898
 899         /* Register charger interrupts */
 900         for (i = 0; i < CHRG_INTR_END; i++) {
 901                 pirq = platform_get_irq(info->pdev, i);
 902                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 903                 if (info->irq[i] < 0) {
 904                         dev_warn(&info->pdev->dev,
 905                                 "failed to get virtual interrupt=%d\n", pirq);
 906                         ret = info->irq[i];
 907                         goto intr_reg_failed;
 908                 }
 909                 ret = devm_request_threaded_irq(&info->pdev->dev, info->irq[i],
 910                                         NULL, axp288_charger_irq_thread_handler,
 911                                         IRQF_ONESHOT, info->pdev->name, info);
 912                 if (ret) {
 913                         dev_err(&pdev->dev, "failed to request interrupt=%d\n",
 914                                                                 info->irq[i]);
 915                         goto intr_reg_failed;
 916                 }
 917         }
 918
 919         charger_init_hw_regs(info);
 920
 921         return 0;
 922
 923 intr_reg_failed:
 924         if (info->otg.cable)
 925                 extcon_unregister_notifier(info->otg.cable, EXTCON_USB_HOST,
 926                                         &info->otg.id_nb);
 927         power_supply_unregister(info->psy_usb);
 928 psy_reg_failed:
 929         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 930                                         &info->cable.nb);
 931         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 932                                         &info->cable.nb);
 933         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 934                                         &info->cable.nb);
 935         return ret;
 936 }
 937
 938 static int axp288_charger_remove(struct platform_device *pdev)
 939 {
 940         struct axp288_chrg_info *info =  dev_get_drvdata(&pdev->dev);
 941
 942         if (info->otg.cable)
 943                 extcon_unregister_notifier(info->otg.cable, EXTCON_USB_HOST,
 944                                         &info->otg.id_nb);
 945
 946         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_SDP,
 947                                         &info->cable.nb);
 948         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_CDP,
 949                                         &info->cable.nb);
 950         extcon_unregister_notifier(info->cable.edev, EXTCON_CHG_USB_DCP,
 951                                         &info->cable.nb);
 952         power_supply_unregister(info->psy_usb);
 953
 954         return 0;
 955 }
 956
 957 static struct platform_driver axp288_charger_driver = {
 958         .probe = axp288_charger_probe,
 959         .remove = axp288_charger_remove,
 960         .driver = {
 961                 .name = "axp288_charger",
 962         },
 963 };
 964
 965 module_platform_driver(axp288_charger_driver);
 966
 967 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 968 MODULE_DESCRIPTION("X-power AXP288 Charger Driver");
 969 MODULE_LICENSE("GPL v2");