drivers/power/intel_mid_battery.c

   1 /*
   2  * intel_mid_battery.c - Intel MID PMIC Battery Driver
   3  *
   4  * Copyright (C) 2009 Intel Corporation
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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 as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  *
  21  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  22  * Author: Nithish Mahalingam <nithish.mahalingam@intel.com>
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/err.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/param.h>
  32 #include <linux/device.h>
  33 #include <linux/spi/spi.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/power_supply.h>
  36
  37 #include <asm/intel_scu_ipc.h>
  38
  39 #define DRIVER_NAME "pmic_battery"
  40
  41 /*********************************************************************
  42  *              Generic defines
  43  *********************************************************************/
  44
  45 static int debug;
  46 module_param(debug, int, 0444);
  47 MODULE_PARM_DESC(debug, "Flag to enable PMIC Battery debug messages.");
  48
  49 #define PMIC_BATT_DRV_INFO_UPDATED      1
  50 #define PMIC_BATT_PRESENT               1
  51 #define PMIC_BATT_NOT_PRESENT           0
  52 #define PMIC_USB_PRESENT                PMIC_BATT_PRESENT
  53 #define PMIC_USB_NOT_PRESENT            PMIC_BATT_NOT_PRESENT
  54
  55 /* pmic battery register related */
  56 #define PMIC_BATT_CHR_SCHRGINT_ADDR     0xD2
  57 #define PMIC_BATT_CHR_SBATOVP_MASK      (1 << 1)
  58 #define PMIC_BATT_CHR_STEMP_MASK        (1 << 2)
  59 #define PMIC_BATT_CHR_SCOMP_MASK        (1 << 3)
  60 #define PMIC_BATT_CHR_SUSBDET_MASK      (1 << 4)
  61 #define PMIC_BATT_CHR_SBATDET_MASK      (1 << 5)
  62 #define PMIC_BATT_CHR_SDCLMT_MASK       (1 << 6)
  63 #define PMIC_BATT_CHR_SUSBOVP_MASK      (1 << 7)
  64 #define PMIC_BATT_CHR_EXCPT_MASK        0x86
  65
  66 #define PMIC_BATT_ADC_ACCCHRG_MASK      (1 << 31)
  67 #define PMIC_BATT_ADC_ACCCHRGVAL_MASK   0x7FFFFFFF
  68
  69 /* pmic ipc related */
  70 #define PMIC_BATT_CHR_IPC_FCHRG_SUBID   0x4
  71 #define PMIC_BATT_CHR_IPC_TCHRG_SUBID   0x6
  72
  73 /* types of battery charging */
  74 enum batt_charge_type {
  75         BATT_USBOTG_500MA_CHARGE,
  76         BATT_USBOTG_TRICKLE_CHARGE,
  77 };
  78
  79 /* valid battery events */
  80 enum batt_event {
  81         BATT_EVENT_BATOVP_EXCPT,
  82         BATT_EVENT_USBOVP_EXCPT,
  83         BATT_EVENT_TEMP_EXCPT,
  84         BATT_EVENT_DCLMT_EXCPT,
  85         BATT_EVENT_EXCPT
  86 };
  87
  88
  89 /*********************************************************************
  90  *              Battery properties
  91  *********************************************************************/
  92
  93 /*
  94  * pmic battery info
  95  */
  96 struct pmic_power_module_info {
  97         bool is_dev_info_updated;
  98         struct device *dev;
  99         /* pmic battery data */
 100         unsigned long update_time;              /* jiffies when data read */
 101         unsigned int usb_is_present;
 102         unsigned int batt_is_present;
 103         unsigned int batt_health;
 104         unsigned int usb_health;
 105         unsigned int batt_status;
 106         unsigned int batt_charge_now;           /* in mAS */
 107         unsigned int batt_prev_charge_full;     /* in mAS */
 108         unsigned int batt_charge_rate;          /* in units per second */
 109
 110         struct power_supply usb;
 111         struct power_supply batt;
 112         int irq;                                /* GPE_ID or IRQ# */
 113         struct workqueue_struct *monitor_wqueue;
 114         struct delayed_work monitor_battery;
 115         struct work_struct handler;
 116 };
 117
 118 static unsigned int delay_time = 2000;  /* in ms */
 119
 120 /*
 121  * pmic ac properties
 122  */
 123 static enum power_supply_property pmic_usb_props[] = {
 124         POWER_SUPPLY_PROP_PRESENT,
 125         POWER_SUPPLY_PROP_HEALTH,
 126 };
 127
 128 /*
 129  * pmic battery properties
 130  */
 131 static enum power_supply_property pmic_battery_props[] = {
 132         POWER_SUPPLY_PROP_STATUS,
 133         POWER_SUPPLY_PROP_HEALTH,
 134         POWER_SUPPLY_PROP_PRESENT,
 135         POWER_SUPPLY_PROP_CHARGE_NOW,
 136         POWER_SUPPLY_PROP_CHARGE_FULL,
 137 };
 138
 139
 140 /*
 141  * Glue functions for talking to the IPC
 142  */
 143
 144 struct battery_property {
 145         u32 capacity;   /* Charger capacity */
 146         u8  crnt;       /* Quick charge current value*/
 147         u8  volt;       /* Fine adjustment of constant charge voltage */
 148         u8  prot;       /* CHRGPROT register value */
 149         u8  prot2;      /* CHRGPROT1 register value */
 150         u8  timer;      /* Charging timer */
 151 };
 152
 153 #define IPCMSG_BATTERY          0xEF
 154
 155 /* Battery coulomb counter accumulator commands */
 156 #define IPC_CMD_CC_WR             0 /* Update coulomb counter value */
 157 #define IPC_CMD_CC_RD             1 /* Read coulomb counter value */
 158 #define IPC_CMD_BATTERY_PROPERTY  2 /* Read Battery property */
 159
 160 /**
 161  *      pmic_scu_ipc_battery_cc_read    -       read battery cc
 162  *      @value: battery coulomb counter read
 163  *
 164  *      Reads the battery couloumb counter value, returns 0 on success, or
 165  *      an error code
 166  *
 167  *      This function may sleep. Locking for SCU accesses is handled for
 168  *      the caller.
 169  */
 170 static int pmic_scu_ipc_battery_cc_read(u32 *value)
 171 {
 172         return intel_scu_ipc_command(IPCMSG_BATTERY, IPC_CMD_CC_RD,
 173                                         NULL, 0, value, 1);
 174 }
 175
 176 /**
 177  *      pmic_scu_ipc_battery_property_get       -       fetch properties
 178  *      @prop: battery properties
 179  *
 180  *      Retrieve the battery properties from the power management
 181  *
 182  *      This function may sleep. Locking for SCU accesses is handled for
 183  *      the caller.
 184  */
 185 static int pmic_scu_ipc_battery_property_get(struct battery_property *prop)
 186 {
 187         u32 data[3];
 188         u8 *p = (u8 *)&data[1];
 189         int err = intel_scu_ipc_command(IPCMSG_BATTERY,
 190                                 IPC_CMD_BATTERY_PROPERTY, NULL, 0, data, 3);
 191
 192         prop->capacity = data[0];
 193         prop->crnt = *p++;
 194         prop->volt = *p++;
 195         prop->prot = *p++;
 196         prop->prot2 = *p++;
 197         prop->timer = *p++;
 198
 199         return err;
 200 }
 201
 202 /**
 203  *      pmic_scu_ipc_set_charger        -       set charger
 204  *      @charger: charger to select
 205  *
 206  *      Switch the charging mode for the SCU
 207  */
 208
 209 static int pmic_scu_ipc_set_charger(int charger)
 210 {
 211         return intel_scu_ipc_simple_command(IPCMSG_BATTERY, charger);
 212 }
 213
 214 /**
 215  * pmic_battery_log_event - log battery events
 216  * @event: battery event to be logged
 217  * Context: can sleep
 218  *
 219  * There are multiple battery events which may be of interest to users;
 220  * this battery function logs the different battery events onto the
 221  * kernel log messages.
 222  */
 223 static void pmic_battery_log_event(enum batt_event event)
 224 {
 225         printk(KERN_WARNING "pmic-battery: ");
 226         switch (event) {
 227         case BATT_EVENT_BATOVP_EXCPT:
 228                 printk(KERN_CONT "battery overvoltage condition\n");
 229                 break;
 230         case BATT_EVENT_USBOVP_EXCPT:
 231                 printk(KERN_CONT "usb charger overvoltage condition\n");
 232                 break;
 233         case BATT_EVENT_TEMP_EXCPT:
 234                 printk(KERN_CONT "high battery temperature condition\n");
 235                 break;
 236         case BATT_EVENT_DCLMT_EXCPT:
 237                 printk(KERN_CONT "over battery charge current condition\n");
 238                 break;
 239         default:
 240                 printk(KERN_CONT "charger/battery exception %d\n", event);
 241                 break;
 242         }
 243 }
 244
 245 /**
 246  * pmic_battery_read_status - read battery status information
 247  * @pbi: device info structure to update the read information
 248  * Context: can sleep
 249  *
 250  * PMIC power source information need to be updated based on the data read
 251  * from the PMIC battery registers.
 252  *
 253  */
 254 static void pmic_battery_read_status(struct pmic_power_module_info *pbi)
 255 {
 256         unsigned int update_time_intrvl;
 257         unsigned int chrg_val;
 258         u32 ccval;
 259         u8 r8;
 260         struct battery_property batt_prop;
 261         int batt_present = 0;
 262         int usb_present = 0;
 263         int batt_exception = 0;
 264
 265         /* make sure the last batt_status read happened delay_time before */
 266         if (pbi->update_time && time_before(jiffies, pbi->update_time +
 267                                                 msecs_to_jiffies(delay_time)))
 268                 return;
 269
 270         update_time_intrvl = jiffies_to_msecs(jiffies - pbi->update_time);
 271         pbi->update_time = jiffies;
 272
 273         /* read coulomb counter registers and schrgint register */
 274         if (pmic_scu_ipc_battery_cc_read(&ccval)) {
 275                 dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
 276                                                                 __func__);
 277                 return;
 278         }
 279
 280         if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
 281                 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
 282                                                                 __func__);
 283                 return;
 284         }
 285
 286         /*
 287          * set pmic_power_module_info members based on pmic register values
 288          * read.
 289          */
 290
 291         /* set batt_is_present */
 292         if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
 293                 pbi->batt_is_present = PMIC_BATT_PRESENT;
 294                 batt_present = 1;
 295         } else {
 296                 pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
 297                 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 298                 pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
 299         }
 300
 301         /* set batt_health */
 302         if (batt_present) {
 303                 if (r8 & PMIC_BATT_CHR_SBATOVP_MASK) {
 304                         pbi->batt_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 305                         pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 306                         pmic_battery_log_event(BATT_EVENT_BATOVP_EXCPT);
 307                         batt_exception = 1;
 308                 } else if (r8 & PMIC_BATT_CHR_STEMP_MASK) {
 309                         pbi->batt_health = POWER_SUPPLY_HEALTH_OVERHEAT;
 310                         pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 311                         pmic_battery_log_event(BATT_EVENT_TEMP_EXCPT);
 312                         batt_exception = 1;
 313                 } else {
 314                         pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
 315                         if (r8 & PMIC_BATT_CHR_SDCLMT_MASK) {
 316                                 /* PMIC will change charging current automatically */
 317                                 pmic_battery_log_event(BATT_EVENT_DCLMT_EXCPT);
 318                         }
 319                 }
 320         }
 321
 322         /* set usb_is_present */
 323         if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
 324                 pbi->usb_is_present = PMIC_USB_PRESENT;
 325                 usb_present = 1;
 326         } else {
 327                 pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
 328                 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 329         }
 330
 331         if (usb_present) {
 332                 if (r8 & PMIC_BATT_CHR_SUSBOVP_MASK) {
 333                         pbi->usb_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 334                         pmic_battery_log_event(BATT_EVENT_USBOVP_EXCPT);
 335                 } else {
 336                         pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
 337                 }
 338         }
 339
 340         chrg_val = ccval & PMIC_BATT_ADC_ACCCHRGVAL_MASK;
 341
 342         /* set batt_prev_charge_full to battery capacity the first time */
 343         if (!pbi->is_dev_info_updated) {
 344                 if (pmic_scu_ipc_battery_property_get(&batt_prop)) {
 345                         dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
 346                                                                 __func__);
 347                         return;
 348                 }
 349                 pbi->batt_prev_charge_full = batt_prop.capacity;
 350         }
 351
 352         /* set batt_status */
 353         if (batt_present && !batt_exception) {
 354                 if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
 355                         pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
 356                         pbi->batt_prev_charge_full = chrg_val;
 357                 } else if (ccval & PMIC_BATT_ADC_ACCCHRG_MASK) {
 358                         pbi->batt_status = POWER_SUPPLY_STATUS_DISCHARGING;
 359                 } else {
 360                         pbi->batt_status = POWER_SUPPLY_STATUS_CHARGING;
 361                 }
 362         }
 363
 364         /* set batt_charge_rate */
 365         if (pbi->is_dev_info_updated && batt_present && !batt_exception) {
 366                 if (pbi->batt_status == POWER_SUPPLY_STATUS_DISCHARGING) {
 367                         if (pbi->batt_charge_now - chrg_val) {
 368                                 pbi->batt_charge_rate = ((pbi->batt_charge_now -
 369                                         chrg_val) * 1000 * 60) /
 370                                         update_time_intrvl;
 371                         }
 372                 } else if (pbi->batt_status == POWER_SUPPLY_STATUS_CHARGING) {
 373                         if (chrg_val - pbi->batt_charge_now) {
 374                                 pbi->batt_charge_rate = ((chrg_val -
 375                                         pbi->batt_charge_now) * 1000 * 60) /
 376                                         update_time_intrvl;
 377                         }
 378                 } else
 379                         pbi->batt_charge_rate = 0;
 380         } else {
 381                 pbi->batt_charge_rate = -1;
 382         }
 383
 384         /* batt_charge_now */
 385         if (batt_present && !batt_exception)
 386                 pbi->batt_charge_now = chrg_val;
 387         else
 388                 pbi->batt_charge_now = -1;
 389
 390         pbi->is_dev_info_updated = PMIC_BATT_DRV_INFO_UPDATED;
 391 }
 392
 393 /**
 394  * pmic_usb_get_property - usb power source get property
 395  * @psy: usb power supply context
 396  * @psp: usb power source property
 397  * @val: usb power source property value
 398  * Context: can sleep
 399  *
 400  * PMIC usb power source property needs to be provided to power_supply
 401  * subsytem for it to provide the information to users.
 402  */
 403 static int pmic_usb_get_property(struct power_supply *psy,
 404                                 enum power_supply_property psp,
 405                                 union power_supply_propval *val)
 406 {
 407         struct pmic_power_module_info *pbi = container_of(psy,
 408                                 struct pmic_power_module_info, usb);
 409
 410         /* update pmic_power_module_info members */
 411         pmic_battery_read_status(pbi);
 412
 413         switch (psp) {
 414         case POWER_SUPPLY_PROP_PRESENT:
 415                 val->intval = pbi->usb_is_present;
 416                 break;
 417         case POWER_SUPPLY_PROP_HEALTH:
 418                 val->intval = pbi->usb_health;
 419                 break;
 420         default:
 421                 return -EINVAL;
 422         }
 423
 424         return 0;
 425 }
 426
 427 static inline unsigned long mAStouAh(unsigned long v)
 428 {
 429         /* seconds to hours, mA to µA */
 430         return (v * 1000) / 3600;
 431 }
 432
 433 /**
 434  * pmic_battery_get_property - battery power source get property
 435  * @psy: battery power supply context
 436  * @psp: battery power source property
 437  * @val: battery power source property value
 438  * Context: can sleep
 439  *
 440  * PMIC battery power source property needs to be provided to power_supply
 441  * subsytem for it to provide the information to users.
 442  */
 443 static int pmic_battery_get_property(struct power_supply *psy,
 444                                 enum power_supply_property psp,
 445                                 union power_supply_propval *val)
 446 {
 447         struct pmic_power_module_info *pbi = container_of(psy,
 448                                 struct pmic_power_module_info, batt);
 449
 450         /* update pmic_power_module_info members */
 451         pmic_battery_read_status(pbi);
 452
 453         switch (psp) {
 454         case POWER_SUPPLY_PROP_STATUS:
 455                 val->intval = pbi->batt_status;
 456                 break;
 457         case POWER_SUPPLY_PROP_HEALTH:
 458                 val->intval = pbi->batt_health;
 459                 break;
 460         case POWER_SUPPLY_PROP_PRESENT:
 461                 val->intval = pbi->batt_is_present;
 462                 break;
 463         case POWER_SUPPLY_PROP_CHARGE_NOW:
 464                 val->intval = mAStouAh(pbi->batt_charge_now);
 465                 break;
 466         case POWER_SUPPLY_PROP_CHARGE_FULL:
 467                 val->intval = mAStouAh(pbi->batt_prev_charge_full);
 468                 break;
 469         default:
 470                 return -EINVAL;
 471         }
 472
 473         return 0;
 474 }
 475
 476 /**
 477  * pmic_battery_monitor - monitor battery status
 478  * @work: work structure
 479  * Context: can sleep
 480  *
 481  * PMIC battery status needs to be monitored for any change
 482  * and information needs to be frequently updated.
 483  */
 484 static void pmic_battery_monitor(struct work_struct *work)
 485 {
 486         struct pmic_power_module_info *pbi = container_of(work,
 487                         struct pmic_power_module_info, monitor_battery.work);
 488
 489         /* update pmic_power_module_info members */
 490         pmic_battery_read_status(pbi);
 491         queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 10);
 492 }
 493
 494 /**
 495  * pmic_battery_set_charger - set battery charger
 496  * @pbi: device info structure
 497  * @chrg: charge mode to set battery charger in
 498  * Context: can sleep
 499  *
 500  * PMIC battery charger needs to be enabled based on the usb charge
 501  * capabilities connected to the platform.
 502  */
 503 static int pmic_battery_set_charger(struct pmic_power_module_info *pbi,
 504                                                 enum batt_charge_type chrg)
 505 {
 506         int retval;
 507
 508         /* set usblmt bits and chrgcntl register bits appropriately */
 509         switch (chrg) {
 510         case BATT_USBOTG_500MA_CHARGE:
 511                 retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_FCHRG_SUBID);
 512                 break;
 513         case BATT_USBOTG_TRICKLE_CHARGE:
 514                 retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_TCHRG_SUBID);
 515                 break;
 516         default:
 517                 dev_warn(pbi->dev, "%s(): out of range usb charger "
 518                                                 "charge detected\n", __func__);
 519                 return -EINVAL;
 520         }
 521
 522         if (retval) {
 523                 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
 524                                                                 __func__);
 525                 return retval;
 526         }
 527
 528         return 0;
 529 }
 530
 531 /**
 532  * pmic_battery_interrupt_handler - pmic battery interrupt handler
 533  * Context: interrupt context
 534  *
 535  * PMIC battery interrupt handler which will be called with either
 536  * battery full condition occurs or usb otg & battery connect
 537  * condition occurs.
 538  */
 539 static irqreturn_t pmic_battery_interrupt_handler(int id, void *dev)
 540 {
 541         struct pmic_power_module_info *pbi = dev;
 542
 543         schedule_work(&pbi->handler);
 544
 545         return IRQ_HANDLED;
 546 }
 547
 548 /**
 549  * pmic_battery_handle_intrpt - pmic battery service interrupt
 550  * @work: work structure
 551  * Context: can sleep
 552  *
 553  * PMIC battery needs to either update the battery status as full
 554  * if it detects battery full condition caused the interrupt or needs
 555  * to enable battery charger if it detects usb and battery detect
 556  * caused the source of interrupt.
 557  */
 558 static void pmic_battery_handle_intrpt(struct work_struct *work)
 559 {
 560         struct pmic_power_module_info *pbi = container_of(work,
 561                                 struct pmic_power_module_info, handler);
 562         enum batt_charge_type chrg;
 563         u8 r8;
 564
 565         if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
 566                 dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
 567                                                                 __func__);
 568                 return;
 569         }
 570         /* find the cause of the interrupt */
 571         if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
 572                 pbi->batt_is_present = PMIC_BATT_PRESENT;
 573         } else {
 574                 pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
 575                 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 576                 pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
 577                 return;
 578         }
 579
 580         if (r8 & PMIC_BATT_CHR_EXCPT_MASK) {
 581                 pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 582                 pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 583                 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 584                 pmic_battery_log_event(BATT_EVENT_EXCPT);
 585                 return;
 586         } else {
 587                 pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
 588                 pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
 589         }
 590
 591         if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
 592                 u32 ccval;
 593                 pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
 594
 595                 if (pmic_scu_ipc_battery_cc_read(&ccval)) {
 596                         dev_warn(pbi->dev, "%s(): ipc config cmd "
 597                                                         "failed\n", __func__);
 598                         return;
 599                 }
 600                 pbi->batt_prev_charge_full = ccval &
 601                                                 PMIC_BATT_ADC_ACCCHRGVAL_MASK;
 602                 return;
 603         }
 604
 605         if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
 606                 pbi->usb_is_present = PMIC_USB_PRESENT;
 607         } else {
 608                 pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
 609                 pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
 610                 return;
 611         }
 612
 613         /* setup battery charging */
 614
 615 #if 0
 616         /* check usb otg power capability and set charger accordingly */
 617         retval = langwell_udc_maxpower(&power);
 618         if (retval) {
 619                 dev_warn(pbi->dev,
 620                     "%s(): usb otg power query failed with error code %d\n",
 621                         __func__, retval);
 622                 return;
 623         }
 624
 625         if (power >= 500)
 626                 chrg = BATT_USBOTG_500MA_CHARGE;
 627         else
 628 #endif
 629                 chrg = BATT_USBOTG_TRICKLE_CHARGE;
 630
 631         /* enable battery charging */
 632         if (pmic_battery_set_charger(pbi, chrg)) {
 633                 dev_warn(pbi->dev,
 634                         "%s(): failed to set up battery charging\n", __func__);
 635                 return;
 636         }
 637
 638         dev_dbg(pbi->dev,
 639                 "pmic-battery: %s() - setting up battery charger successful\n",
 640                         __func__);
 641 }
 642
 643 /**
 644  * pmic_battery_probe - pmic battery initialize
 645  * @irq: pmic battery device irq
 646  * @dev: pmic battery device structure
 647  * Context: can sleep
 648  *
 649  * PMIC battery initializes its internal data structue and other
 650  * infrastructure components for it to work as expected.
 651  */
 652 static __devinit int probe(int irq, struct device *dev)
 653 {
 654         int retval = 0;
 655         struct pmic_power_module_info *pbi;
 656
 657         dev_dbg(dev, "pmic-battery: found pmic battery device\n");
 658
 659         pbi = kzalloc(sizeof(*pbi), GFP_KERNEL);
 660         if (!pbi) {
 661                 dev_err(dev, "%s(): memory allocation failed\n",
 662                                                                 __func__);
 663                 return -ENOMEM;
 664         }
 665
 666         pbi->dev = dev;
 667         pbi->irq = irq;
 668         dev_set_drvdata(dev, pbi);
 669
 670         /* initialize all required framework before enabling interrupts */
 671         INIT_WORK(&pbi->handler, pmic_battery_handle_intrpt);
 672         INIT_DELAYED_WORK(&pbi->monitor_battery, pmic_battery_monitor);
 673         pbi->monitor_wqueue =
 674                         create_singlethread_workqueue(dev_name(dev));
 675         if (!pbi->monitor_wqueue) {
 676                 dev_err(dev, "%s(): wqueue init failed\n", __func__);
 677                 retval = -ESRCH;
 678                 goto wqueue_failed;
 679         }
 680
 681         /* register interrupt */
 682         retval = request_irq(pbi->irq, pmic_battery_interrupt_handler,
 683                                                         0, DRIVER_NAME, pbi);
 684         if (retval) {
 685                 dev_err(dev, "%s(): cannot get IRQ\n", __func__);
 686                 goto requestirq_failed;
 687         }
 688
 689         /* register pmic-batt with power supply subsystem */
 690         pbi->batt.name = "pmic-batt";
 691         pbi->batt.type = POWER_SUPPLY_TYPE_BATTERY;
 692         pbi->batt.properties = pmic_battery_props;
 693         pbi->batt.num_properties = ARRAY_SIZE(pmic_battery_props);
 694         pbi->batt.get_property = pmic_battery_get_property;
 695         retval = power_supply_register(dev, &pbi->batt);
 696         if (retval) {
 697                 dev_err(dev,
 698                         "%s(): failed to register pmic battery device with power supply subsystem\n",
 699                                 __func__);
 700                 goto power_reg_failed;
 701         }
 702
 703         dev_dbg(dev, "pmic-battery: %s() - pmic battery device "
 704                 "registration with power supply subsystem successful\n",
 705                 __func__);
 706
 707         queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 1);
 708
 709         /* register pmic-usb with power supply subsystem */
 710         pbi->usb.name = "pmic-usb";
 711         pbi->usb.type = POWER_SUPPLY_TYPE_USB;
 712         pbi->usb.properties = pmic_usb_props;
 713         pbi->usb.num_properties = ARRAY_SIZE(pmic_usb_props);
 714         pbi->usb.get_property = pmic_usb_get_property;
 715         retval = power_supply_register(dev, &pbi->usb);
 716         if (retval) {
 717                 dev_err(dev,
 718                         "%s(): failed to register pmic usb device with power supply subsystem\n",
 719                                 __func__);
 720                 goto power_reg_failed_1;
 721         }
 722
 723         if (debug)
 724                 printk(KERN_INFO "pmic-battery: %s() - pmic usb device "
 725                         "registration with power supply subsystem successful\n",
 726                         __func__);
 727
 728         return retval;
 729
 730 power_reg_failed_1:
 731         power_supply_unregister(&pbi->batt);
 732 power_reg_failed:
 733         cancel_delayed_work_sync(&pbi->monitor_battery);
 734 requestirq_failed:
 735         destroy_workqueue(pbi->monitor_wqueue);
 736 wqueue_failed:
 737         kfree(pbi);
 738
 739         return retval;
 740 }
 741
 742 static int __devinit platform_pmic_battery_probe(struct platform_device *pdev)
 743 {
 744         return probe(pdev->id, &pdev->dev);
 745 }
 746
 747 /**
 748  * pmic_battery_remove - pmic battery finalize
 749  * @dev: pmic battery device structure
 750  * Context: can sleep
 751  *
 752  * PMIC battery finalizes its internal data structue and other
 753  * infrastructure components that it initialized in
 754  * pmic_battery_probe.
 755  */
 756
 757 static int __devexit platform_pmic_battery_remove(struct platform_device *pdev)
 758 {
 759         struct pmic_power_module_info *pbi = dev_get_drvdata(&pdev->dev);
 760
 761         free_irq(pbi->irq, pbi);
 762         cancel_delayed_work_sync(&pbi->monitor_battery);
 763         destroy_workqueue(pbi->monitor_wqueue);
 764
 765         power_supply_unregister(&pbi->usb);
 766         power_supply_unregister(&pbi->batt);
 767
 768         cancel_work_sync(&pbi->handler);
 769         kfree(pbi);
 770         return 0;
 771 }
 772
 773 static struct platform_driver platform_pmic_battery_driver = {
 774         .driver = {
 775                 .name = DRIVER_NAME,
 776                 .owner = THIS_MODULE,
 777         },
 778         .probe = platform_pmic_battery_probe,
 779         .remove = __devexit_p(platform_pmic_battery_remove),
 780 };
 781
 782 module_platform_driver(platform_pmic_battery_driver);
 783
 784 MODULE_AUTHOR("Nithish Mahalingam <nithish.mahalingam@intel.com>");
 785 MODULE_DESCRIPTION("Intel Moorestown PMIC Battery Driver");
 786 MODULE_LICENSE("GPL");