drivers/power/supply/ab8500_charger.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson SA 2012
   4  *
   5  * Charger driver for AB8500
   6  *
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/notifier.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/completion.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/err.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/kobject.h>
  27 #include <linux/of.h>
  28 #include <linux/mfd/core.h>
  29 #include <linux/mfd/abx500/ab8500.h>
  30 #include <linux/mfd/abx500.h>
  31 #include <linux/mfd/abx500/ab8500-bm.h>
  32 #include <linux/mfd/abx500/ab8500-gpadc.h>
  33 #include <linux/mfd/abx500/ux500_chargalg.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/mutex.h>
  36
  37 /* Charger constants */
  38 #define NO_PW_CONN                      0
  39 #define AC_PW_CONN                      1
  40 #define USB_PW_CONN                     2
  41
  42 #define MAIN_WDOG_ENA                   0x01
  43 #define MAIN_WDOG_KICK                  0x02
  44 #define MAIN_WDOG_DIS                   0x00
  45 #define CHARG_WD_KICK                   0x01
  46 #define MAIN_CH_ENA                     0x01
  47 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  48 #define USB_CH_ENA                      0x01
  49 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  50 #define MAIN_CH_DET                     0x01
  51 #define MAIN_CH_CV_ON                   0x04
  52 #define USB_CH_CV_ON                    0x08
  53 #define VBUS_DET_DBNC100                0x02
  54 #define VBUS_DET_DBNC1                  0x01
  55 #define OTP_ENABLE_WD                   0x01
  56 #define DROP_COUNT_RESET                0x01
  57 #define USB_CH_DET                      0x01
  58
  59 #define MAIN_CH_INPUT_CURR_SHIFT        4
  60 #define VBUS_IN_CURR_LIM_SHIFT          4
  61 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
  62 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
  63
  64 #define LED_INDICATOR_PWM_ENA           0x01
  65 #define LED_INDICATOR_PWM_DIS           0x00
  66 #define LED_IND_CUR_5MA                 0x04
  67 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  68
  69 /* HW failure constants */
  70 #define MAIN_CH_TH_PROT                 0x02
  71 #define VBUS_CH_NOK                     0x08
  72 #define USB_CH_TH_PROT                  0x02
  73 #define VBUS_OVV_TH                     0x01
  74 #define MAIN_CH_NOK                     0x01
  75 #define VBUS_DET                        0x80
  76
  77 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
  78 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
  79 #define USB_CH_VBUSDROP                         0x40
  80 #define USB_CH_VBUSDETDBNC                      0x01
  81
  82 /* UsbLineStatus register bit masks */
  83 #define AB8500_USB_LINK_STATUS          0x78
  84 #define AB8505_USB_LINK_STATUS          0xF8
  85 #define AB8500_STD_HOST_SUSP            0x18
  86 #define USB_LINK_STATUS_SHIFT           3
  87
  88 /* Watchdog timeout constant */
  89 #define WD_TIMER                        0x30 /* 4min */
  90 #define WD_KICK_INTERVAL                (60 * HZ)
  91
  92 /* Lowest charger voltage is 3.39V -> 0x4E */
  93 #define LOW_VOLT_REG                    0x4E
  94
  95 /* Step up/down delay in us */
  96 #define STEP_UDELAY                     1000
  97
  98 #define CHARGER_STATUS_POLL 10 /* in ms */
  99
 100 #define CHG_WD_INTERVAL                 (60 * HZ)
 101
 102 #define AB8500_SW_CONTROL_FALLBACK      0x03
 103 /* Wait for enumeration before charing in us */
 104 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
 105 /*External charger control*/
 106 #define AB8500_SYS_CHARGER_CONTROL_REG          0x52
 107 #define EXTERNAL_CHARGER_DISABLE_REG_VAL        0x03
 108 #define EXTERNAL_CHARGER_ENABLE_REG_VAL         0x07
 109
 110 /* UsbLineStatus register - usb types */
 111 enum ab8500_charger_link_status {
 112         USB_STAT_NOT_CONFIGURED,
 113         USB_STAT_STD_HOST_NC,
 114         USB_STAT_STD_HOST_C_NS,
 115         USB_STAT_STD_HOST_C_S,
 116         USB_STAT_HOST_CHG_NM,
 117         USB_STAT_HOST_CHG_HS,
 118         USB_STAT_HOST_CHG_HS_CHIRP,
 119         USB_STAT_DEDICATED_CHG,
 120         USB_STAT_ACA_RID_A,
 121         USB_STAT_ACA_RID_B,
 122         USB_STAT_ACA_RID_C_NM,
 123         USB_STAT_ACA_RID_C_HS,
 124         USB_STAT_ACA_RID_C_HS_CHIRP,
 125         USB_STAT_HM_IDGND,
 126         USB_STAT_RESERVED,
 127         USB_STAT_NOT_VALID_LINK,
 128         USB_STAT_PHY_EN,
 129         USB_STAT_SUP_NO_IDGND_VBUS,
 130         USB_STAT_SUP_IDGND_VBUS,
 131         USB_STAT_CHARGER_LINE_1,
 132         USB_STAT_CARKIT_1,
 133         USB_STAT_CARKIT_2,
 134         USB_STAT_ACA_DOCK_CHARGER,
 135 };
 136
 137 enum ab8500_usb_state {
 138         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 139         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 140         AB8500_BM_USB_STATE_CONFIGURED,
 141         AB8500_BM_USB_STATE_SUSPEND,
 142         AB8500_BM_USB_STATE_RESUME,
 143         AB8500_BM_USB_STATE_MAX,
 144 };
 145
 146 /* VBUS input current limits supported in AB8500 in mA */
 147 #define USB_CH_IP_CUR_LVL_0P05          50
 148 #define USB_CH_IP_CUR_LVL_0P09          98
 149 #define USB_CH_IP_CUR_LVL_0P19          193
 150 #define USB_CH_IP_CUR_LVL_0P29          290
 151 #define USB_CH_IP_CUR_LVL_0P38          380
 152 #define USB_CH_IP_CUR_LVL_0P45          450
 153 #define USB_CH_IP_CUR_LVL_0P5           500
 154 #define USB_CH_IP_CUR_LVL_0P6           600
 155 #define USB_CH_IP_CUR_LVL_0P7           700
 156 #define USB_CH_IP_CUR_LVL_0P8           800
 157 #define USB_CH_IP_CUR_LVL_0P9           900
 158 #define USB_CH_IP_CUR_LVL_1P0           1000
 159 #define USB_CH_IP_CUR_LVL_1P1           1100
 160 #define USB_CH_IP_CUR_LVL_1P3           1300
 161 #define USB_CH_IP_CUR_LVL_1P4           1400
 162 #define USB_CH_IP_CUR_LVL_1P5           1500
 163
 164 #define VBAT_TRESH_IP_CUR_RED           3800
 165
 166 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 167         struct ab8500_charger, usb_chg)
 168 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 169         struct ab8500_charger, ac_chg)
 170
 171 /**
 172  * struct ab8500_charger_interrupts - ab8500 interupts
 173  * @name:       name of the interrupt
 174  * @isr         function pointer to the isr
 175  */
 176 struct ab8500_charger_interrupts {
 177         char *name;
 178         irqreturn_t (*isr)(int irq, void *data);
 179 };
 180
 181 struct ab8500_charger_info {
 182         int charger_connected;
 183         int charger_online;
 184         int charger_voltage;
 185         int cv_active;
 186         bool wd_expired;
 187         int charger_current;
 188 };
 189
 190 struct ab8500_charger_event_flags {
 191         bool mainextchnotok;
 192         bool main_thermal_prot;
 193         bool usb_thermal_prot;
 194         bool vbus_ovv;
 195         bool usbchargernotok;
 196         bool chgwdexp;
 197         bool vbus_collapse;
 198         bool vbus_drop_end;
 199 };
 200
 201 struct ab8500_charger_usb_state {
 202         int usb_current;
 203         int usb_current_tmp;
 204         enum ab8500_usb_state state;
 205         enum ab8500_usb_state state_tmp;
 206         spinlock_t usb_lock;
 207 };
 208
 209 struct ab8500_charger_max_usb_in_curr {
 210         int usb_type_max;
 211         int set_max;
 212         int calculated_max;
 213 };
 214
 215 /**
 216  * struct ab8500_charger - ab8500 Charger device information
 217  * @dev:                Pointer to the structure device
 218  * @vbus_detected:      VBUS detected
 219  * @vbus_detected_start:
 220  *                      VBUS detected during startup
 221  * @ac_conn:            This will be true when the AC charger has been plugged
 222  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 223  *                      charger is enabled
 224  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 225  *                      charger is enabled
 226  * @vbat                Battery voltage
 227  * @old_vbat            Previously measured battery voltage
 228  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
 229  * @autopower           Indicate if we should have automatic pwron after pwrloss
 230  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 231  * @invalid_charger_detect_state State when forcing AB to use invalid charger
 232  * @is_aca_rid:         Incicate if accessory is ACA type
 233  * @current_stepping_sessions:
 234  *                      Counter for current stepping sessions
 235  * @parent:             Pointer to the struct ab8500
 236  * @gpadc:              Pointer to the struct gpadc
 237  * @bm:                 Platform specific battery management information
 238  * @flags:              Structure for information about events triggered
 239  * @usb_state:          Structure for usb stack information
 240  * @max_usb_in_curr:    Max USB charger input current
 241  * @ac_chg:             AC charger power supply
 242  * @usb_chg:            USB charger power supply
 243  * @ac:                 Structure that holds the AC charger properties
 244  * @usb:                Structure that holds the USB charger properties
 245  * @regu:               Pointer to the struct regulator
 246  * @charger_wq:         Work queue for the IRQs and checking HW state
 247  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
 248  * @pm_lock:            Lock to prevent system to suspend
 249  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 250  * @check_hw_failure_work:      Work for checking HW state
 251  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 252  * @kick_wd_work:               Work for kicking the charger watchdog in case
 253  *                              of ABB rev 1.* due to the watchog logic bug
 254  * @ac_charger_attached_work:   Work for checking if AC charger is still
 255  *                              connected
 256  * @usb_charger_attached_work:  Work for checking if USB charger is still
 257  *                              connected
 258  * @ac_work:                    Work for checking AC charger connection
 259  * @detect_usb_type_work:       Work for detecting the USB type connected
 260  * @usb_link_status_work:       Work for checking the new USB link status
 261  * @usb_state_changed_work:     Work for checking USB state
 262  * @attach_work:                Work for detecting USB type
 263  * @vbus_drop_end_work:         Work for detecting VBUS drop end
 264  * @check_main_thermal_prot_work:
 265  *                              Work for checking Main thermal status
 266  * @check_usb_thermal_prot_work:
 267  *                              Work for checking USB thermal status
 268  * @charger_attached_mutex:     For controlling the wakelock
 269  */
 270 struct ab8500_charger {
 271         struct device *dev;
 272         bool vbus_detected;
 273         bool vbus_detected_start;
 274         bool ac_conn;
 275         bool vddadc_en_ac;
 276         bool vddadc_en_usb;
 277         int vbat;
 278         int old_vbat;
 279         bool usb_device_is_unrecognised;
 280         bool autopower;
 281         bool autopower_cfg;
 282         int invalid_charger_detect_state;
 283         int is_aca_rid;
 284         atomic_t current_stepping_sessions;
 285         struct ab8500 *parent;
 286         struct ab8500_gpadc *gpadc;
 287         struct abx500_bm_data *bm;
 288         struct ab8500_charger_event_flags flags;
 289         struct ab8500_charger_usb_state usb_state;
 290         struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
 291         struct ux500_charger ac_chg;
 292         struct ux500_charger usb_chg;
 293         struct ab8500_charger_info ac;
 294         struct ab8500_charger_info usb;
 295         struct regulator *regu;
 296         struct workqueue_struct *charger_wq;
 297         struct mutex usb_ipt_crnt_lock;
 298         struct delayed_work check_vbat_work;
 299         struct delayed_work check_hw_failure_work;
 300         struct delayed_work check_usbchgnotok_work;
 301         struct delayed_work kick_wd_work;
 302         struct delayed_work usb_state_changed_work;
 303         struct delayed_work attach_work;
 304         struct delayed_work ac_charger_attached_work;
 305         struct delayed_work usb_charger_attached_work;
 306         struct delayed_work vbus_drop_end_work;
 307         struct work_struct ac_work;
 308         struct work_struct detect_usb_type_work;
 309         struct work_struct usb_link_status_work;
 310         struct work_struct check_main_thermal_prot_work;
 311         struct work_struct check_usb_thermal_prot_work;
 312         struct usb_phy *usb_phy;
 313         struct notifier_block nb;
 314         struct mutex charger_attached_mutex;
 315 };
 316
 317 /* AC properties */
 318 static enum power_supply_property ab8500_charger_ac_props[] = {
 319         POWER_SUPPLY_PROP_HEALTH,
 320         POWER_SUPPLY_PROP_PRESENT,
 321         POWER_SUPPLY_PROP_ONLINE,
 322         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 323         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 324         POWER_SUPPLY_PROP_CURRENT_NOW,
 325 };
 326
 327 /* USB properties */
 328 static enum power_supply_property ab8500_charger_usb_props[] = {
 329         POWER_SUPPLY_PROP_HEALTH,
 330         POWER_SUPPLY_PROP_CURRENT_AVG,
 331         POWER_SUPPLY_PROP_PRESENT,
 332         POWER_SUPPLY_PROP_ONLINE,
 333         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 334         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 335         POWER_SUPPLY_PROP_CURRENT_NOW,
 336 };
 337
 338 /*
 339  * Function for enabling and disabling sw fallback mode
 340  * should always be disabled when no charger is connected.
 341  */
 342 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 343                 bool fallback)
 344 {
 345         u8 val;
 346         u8 reg;
 347         u8 bank;
 348         u8 bit;
 349         int ret;
 350
 351         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 352
 353         if (is_ab8500(di->parent)) {
 354                 bank = 0x15;
 355                 reg = 0x0;
 356                 bit = 3;
 357         } else {
 358                 bank = AB8500_SYS_CTRL1_BLOCK;
 359                 reg = AB8500_SW_CONTROL_FALLBACK;
 360                 bit = 0;
 361         }
 362
 363         /* read the register containing fallback bit */
 364         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
 365         if (ret < 0) {
 366                 dev_err(di->dev, "%d read failed\n", __LINE__);
 367                 return;
 368         }
 369
 370         if (is_ab8500(di->parent)) {
 371                 /* enable the OPT emulation registers */
 372                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 373                 if (ret) {
 374                         dev_err(di->dev, "%d write failed\n", __LINE__);
 375                         goto disable_otp;
 376                 }
 377         }
 378
 379         if (fallback)
 380                 val |= (1 << bit);
 381         else
 382                 val &= ~(1 << bit);
 383
 384         /* write back the changed fallback bit value to register */
 385         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
 386         if (ret) {
 387                 dev_err(di->dev, "%d write failed\n", __LINE__);
 388         }
 389
 390 disable_otp:
 391         if (is_ab8500(di->parent)) {
 392                 /* disable the set OTP registers again */
 393                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 394                 if (ret) {
 395                         dev_err(di->dev, "%d write failed\n", __LINE__);
 396                 }
 397         }
 398 }
 399
 400 /**
 401  * ab8500_power_supply_changed - a wrapper with local extentions for
 402  * power_supply_changed
 403  * @di:   pointer to the ab8500_charger structure
 404  * @psy:  pointer to power_supply_that have changed.
 405  *
 406  */
 407 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 408                                         struct power_supply *psy)
 409 {
 410         if (di->autopower_cfg) {
 411                 if (!di->usb.charger_connected &&
 412                     !di->ac.charger_connected &&
 413                     di->autopower) {
 414                         di->autopower = false;
 415                         ab8500_enable_disable_sw_fallback(di, false);
 416                 } else if (!di->autopower &&
 417                            (di->ac.charger_connected ||
 418                             di->usb.charger_connected)) {
 419                         di->autopower = true;
 420                         ab8500_enable_disable_sw_fallback(di, true);
 421                 }
 422         }
 423         power_supply_changed(psy);
 424 }
 425
 426 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 427         bool connected)
 428 {
 429         if (connected != di->usb.charger_connected) {
 430                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 431                 di->usb.charger_connected = connected;
 432
 433                 if (!connected)
 434                         di->flags.vbus_drop_end = false;
 435
 436                 sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL, "present");
 437
 438                 if (connected) {
 439                         mutex_lock(&di->charger_attached_mutex);
 440                         mutex_unlock(&di->charger_attached_mutex);
 441
 442                         if (is_ab8500(di->parent))
 443                                 queue_delayed_work(di->charger_wq,
 444                                            &di->usb_charger_attached_work,
 445                                            HZ);
 446                 } else {
 447                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
 448                         mutex_lock(&di->charger_attached_mutex);
 449                         mutex_unlock(&di->charger_attached_mutex);
 450                 }
 451         }
 452 }
 453
 454 /**
 455  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 456  * @di:         pointer to the ab8500_charger structure
 457  *
 458  * Returns ac charger voltage (on success)
 459  */
 460 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 461 {
 462         int vch;
 463
 464         /* Only measure voltage if the charger is connected */
 465         if (di->ac.charger_connected) {
 466                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 467                 if (vch < 0)
 468                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 469         } else {
 470                 vch = 0;
 471         }
 472         return vch;
 473 }
 474
 475 /**
 476  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 477  * @di:         pointer to the ab8500_charger structure
 478  *
 479  * Returns ac charger CV mode (on success) else error code
 480  */
 481 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 482 {
 483         u8 val;
 484         int ret = 0;
 485
 486         /* Only check CV mode if the charger is online */
 487         if (di->ac.charger_online) {
 488                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 489                         AB8500_CH_STATUS1_REG, &val);
 490                 if (ret < 0) {
 491                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 492                         return 0;
 493                 }
 494
 495                 if (val & MAIN_CH_CV_ON)
 496                         ret = 1;
 497                 else
 498                         ret = 0;
 499         }
 500
 501         return ret;
 502 }
 503
 504 /**
 505  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 506  * @di:         pointer to the ab8500_charger structure
 507  *
 508  * This function returns the vbus voltage.
 509  * Returns vbus voltage (on success)
 510  */
 511 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 512 {
 513         int vch;
 514
 515         /* Only measure voltage if the charger is connected */
 516         if (di->usb.charger_connected) {
 517                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 518                 if (vch < 0)
 519                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 520         } else {
 521                 vch = 0;
 522         }
 523         return vch;
 524 }
 525
 526 /**
 527  * ab8500_charger_get_usb_current() - get usb charger current
 528  * @di:         pointer to the ab8500_charger structure
 529  *
 530  * This function returns the usb charger current.
 531  * Returns usb current (on success) and error code on failure
 532  */
 533 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 534 {
 535         int ich;
 536
 537         /* Only measure current if the charger is online */
 538         if (di->usb.charger_online) {
 539                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 540                 if (ich < 0)
 541                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 542         } else {
 543                 ich = 0;
 544         }
 545         return ich;
 546 }
 547
 548 /**
 549  * ab8500_charger_get_ac_current() - get ac charger current
 550  * @di:         pointer to the ab8500_charger structure
 551  *
 552  * This function returns the ac charger current.
 553  * Returns ac current (on success) and error code on failure.
 554  */
 555 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 556 {
 557         int ich;
 558
 559         /* Only measure current if the charger is online */
 560         if (di->ac.charger_online) {
 561                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 562                 if (ich < 0)
 563                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 564         } else {
 565                 ich = 0;
 566         }
 567         return ich;
 568 }
 569
 570 /**
 571  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 572  * @di:         pointer to the ab8500_charger structure
 573  *
 574  * Returns ac charger CV mode (on success) else error code
 575  */
 576 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 577 {
 578         int ret;
 579         u8 val;
 580
 581         /* Only check CV mode if the charger is online */
 582         if (di->usb.charger_online) {
 583                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 584                         AB8500_CH_USBCH_STAT1_REG, &val);
 585                 if (ret < 0) {
 586                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 587                         return 0;
 588                 }
 589
 590                 if (val & USB_CH_CV_ON)
 591                         ret = 1;
 592                 else
 593                         ret = 0;
 594         } else {
 595                 ret = 0;
 596         }
 597
 598         return ret;
 599 }
 600
 601 /**
 602  * ab8500_charger_detect_chargers() - Detect the connected chargers
 603  * @di:         pointer to the ab8500_charger structure
 604  * @probe:      if probe, don't delay and wait for HW
 605  *
 606  * Returns the type of charger connected.
 607  * For USB it will not mean we can actually charge from it
 608  * but that there is a USB cable connected that we have to
 609  * identify. This is used during startup when we don't get
 610  * interrupts of the charger detection
 611  *
 612  * Returns an integer value, that means,
 613  * NO_PW_CONN  no power supply is connected
 614  * AC_PW_CONN  if the AC power supply is connected
 615  * USB_PW_CONN  if the USB power supply is connected
 616  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 617  */
 618 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
 619 {
 620         int result = NO_PW_CONN;
 621         int ret;
 622         u8 val;
 623
 624         /* Check for AC charger */
 625         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 626                 AB8500_CH_STATUS1_REG, &val);
 627         if (ret < 0) {
 628                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 629                 return ret;
 630         }
 631
 632         if (val & MAIN_CH_DET)
 633                 result = AC_PW_CONN;
 634
 635         /* Check for USB charger */
 636
 637         if (!probe) {
 638                 /*
 639                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
 640                  * when disconnecting ACA even though no
 641                  * charger was connected. Try waiting a little
 642                  * longer than the 100 ms of VBUS_DET_DBNC100...
 643                  */
 644                 msleep(110);
 645         }
 646         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 647                 AB8500_CH_USBCH_STAT1_REG, &val);
 648         if (ret < 0) {
 649                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 650                 return ret;
 651         }
 652         dev_dbg(di->dev,
 653                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
 654                 val);
 655         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 656                 result |= USB_PW_CONN;
 657
 658         return result;
 659 }
 660
 661 /**
 662  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 663  * @di:                 pointer to the ab8500_charger structure
 664  * @link_status:        the identified USB type
 665  *
 666  * Get the maximum current that is allowed to be drawn from the host
 667  * based on the USB type.
 668  * Returns error code in case of failure else 0 on success
 669  */
 670 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 671                 enum ab8500_charger_link_status link_status)
 672 {
 673         int ret = 0;
 674
 675         di->usb_device_is_unrecognised = false;
 676
 677         /*
 678          * Platform only supports USB 2.0.
 679          * This means that charging current from USB source
 680          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
 681          * should set USB_CH_IP_CUR_LVL_0P5.
 682          */
 683
 684         switch (link_status) {
 685         case USB_STAT_STD_HOST_NC:
 686         case USB_STAT_STD_HOST_C_NS:
 687         case USB_STAT_STD_HOST_C_S:
 688                 dev_dbg(di->dev, "USB Type - Standard host is "
 689                         "detected through USB driver\n");
 690                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 691                 di->is_aca_rid = 0;
 692                 break;
 693         case USB_STAT_HOST_CHG_HS_CHIRP:
 694                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 695                 di->is_aca_rid = 0;
 696                 break;
 697         case USB_STAT_HOST_CHG_HS:
 698                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 699                 di->is_aca_rid = 0;
 700                 break;
 701         case USB_STAT_ACA_RID_C_HS:
 702                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
 703                 di->is_aca_rid = 0;
 704                 break;
 705         case USB_STAT_ACA_RID_A:
 706                 /*
 707                  * Dedicated charger level minus maximum current accessory
 708                  * can consume (900mA). Closest level is 500mA
 709                  */
 710                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
 711                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 712                 di->is_aca_rid = 1;
 713                 break;
 714         case USB_STAT_ACA_RID_B:
 715                 /*
 716                  * Dedicated charger level minus 120mA (20mA for ACA and
 717                  * 100mA for potential accessory). Closest level is 1300mA
 718                  */
 719                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
 720                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 721                                 di->max_usb_in_curr.usb_type_max);
 722                 di->is_aca_rid = 1;
 723                 break;
 724         case USB_STAT_HOST_CHG_NM:
 725                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 726                 di->is_aca_rid = 0;
 727                 break;
 728         case USB_STAT_DEDICATED_CHG:
 729                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 730                 di->is_aca_rid = 0;
 731                 break;
 732         case USB_STAT_ACA_RID_C_HS_CHIRP:
 733         case USB_STAT_ACA_RID_C_NM:
 734                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 735                 di->is_aca_rid = 1;
 736                 break;
 737         case USB_STAT_NOT_CONFIGURED:
 738                 if (di->vbus_detected) {
 739                         di->usb_device_is_unrecognised = true;
 740                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
 741                         di->max_usb_in_curr.usb_type_max =
 742                                                 USB_CH_IP_CUR_LVL_1P5;
 743                         break;
 744                 }
 745                 /* Else, fall through */
 746         case USB_STAT_HM_IDGND:
 747                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 748                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 749                 ret = -ENXIO;
 750                 break;
 751         case USB_STAT_RESERVED:
 752                 if (is_ab8500(di->parent)) {
 753                         di->flags.vbus_collapse = true;
 754                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
 755                                                 "VBUS has collapsed\n");
 756                         ret = -ENXIO;
 757                         break;
 758                 } else {
 759                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
 760                         di->max_usb_in_curr.usb_type_max =
 761                                                 USB_CH_IP_CUR_LVL_0P05;
 762                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 763                                 link_status,
 764                                 di->max_usb_in_curr.usb_type_max);
 765                         ret = -ENXIO;
 766                         break;
 767                 }
 768         case USB_STAT_CARKIT_1:
 769         case USB_STAT_CARKIT_2:
 770         case USB_STAT_ACA_DOCK_CHARGER:
 771         case USB_STAT_CHARGER_LINE_1:
 772                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 773                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 774                                 di->max_usb_in_curr.usb_type_max);
 775                 break;
 776         case USB_STAT_NOT_VALID_LINK:
 777                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
 778                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 779                 break;
 780
 781         default:
 782                 dev_err(di->dev, "USB Type - Unknown\n");
 783                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 784                 ret = -ENXIO;
 785                 break;
 786         };
 787
 788         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
 789         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 790                 link_status, di->max_usb_in_curr.set_max);
 791
 792         return ret;
 793 }
 794
 795 /**
 796  * ab8500_charger_read_usb_type() - read the type of usb connected
 797  * @di:         pointer to the ab8500_charger structure
 798  *
 799  * Detect the type of the plugged USB
 800  * Returns error code in case of failure else 0 on success
 801  */
 802 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 803 {
 804         int ret;
 805         u8 val;
 806
 807         ret = abx500_get_register_interruptible(di->dev,
 808                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 809         if (ret < 0) {
 810                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 811                 return ret;
 812         }
 813         if (is_ab8500(di->parent))
 814                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 815                         AB8500_USB_LINE_STAT_REG, &val);
 816         else
 817                 ret = abx500_get_register_interruptible(di->dev,
 818                         AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 819         if (ret < 0) {
 820                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 821                 return ret;
 822         }
 823
 824         /* get the USB type */
 825         if (is_ab8500(di->parent))
 826                 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 827         else
 828                 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 829         ret = ab8500_charger_max_usb_curr(di,
 830                 (enum ab8500_charger_link_status) val);
 831
 832         return ret;
 833 }
 834
 835 /**
 836  * ab8500_charger_detect_usb_type() - get the type of usb connected
 837  * @di:         pointer to the ab8500_charger structure
 838  *
 839  * Detect the type of the plugged USB
 840  * Returns error code in case of failure else 0 on success
 841  */
 842 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 843 {
 844         int i, ret;
 845         u8 val;
 846
 847         /*
 848          * On getting the VBUS rising edge detect interrupt there
 849          * is a 250ms delay after which the register UsbLineStatus
 850          * is filled with valid data.
 851          */
 852         for (i = 0; i < 10; i++) {
 853                 msleep(250);
 854                 ret = abx500_get_register_interruptible(di->dev,
 855                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 856                         &val);
 857                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
 858                         __func__, val);
 859                 if (ret < 0) {
 860                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 861                         return ret;
 862                 }
 863
 864                 if (is_ab8500(di->parent))
 865                         ret = abx500_get_register_interruptible(di->dev,
 866                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
 867                 else
 868                         ret = abx500_get_register_interruptible(di->dev,
 869                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 870                 if (ret < 0) {
 871                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 872                         return ret;
 873                 }
 874                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
 875                         val);
 876                 /*
 877                  * Until the IT source register is read the UsbLineStatus
 878                  * register is not updated, hence doing the same
 879                  * Revisit this:
 880                  */
 881
 882                 /* get the USB type */
 883                 if (is_ab8500(di->parent))
 884                         val = (val & AB8500_USB_LINK_STATUS) >>
 885                                                         USB_LINK_STATUS_SHIFT;
 886                 else
 887                         val = (val & AB8505_USB_LINK_STATUS) >>
 888                                                         USB_LINK_STATUS_SHIFT;
 889                 if (val)
 890                         break;
 891         }
 892         ret = ab8500_charger_max_usb_curr(di,
 893                 (enum ab8500_charger_link_status) val);
 894
 895         return ret;
 896 }
 897
 898 /*
 899  * This array maps the raw hex value to charger voltage used by the AB8500
 900  * Values taken from the UM0836
 901  */
 902 static int ab8500_charger_voltage_map[] = {
 903         3500 ,
 904         3525 ,
 905         3550 ,
 906         3575 ,
 907         3600 ,
 908         3625 ,
 909         3650 ,
 910         3675 ,
 911         3700 ,
 912         3725 ,
 913         3750 ,
 914         3775 ,
 915         3800 ,
 916         3825 ,
 917         3850 ,
 918         3875 ,
 919         3900 ,
 920         3925 ,
 921         3950 ,
 922         3975 ,
 923         4000 ,
 924         4025 ,
 925         4050 ,
 926         4060 ,
 927         4070 ,
 928         4080 ,
 929         4090 ,
 930         4100 ,
 931         4110 ,
 932         4120 ,
 933         4130 ,
 934         4140 ,
 935         4150 ,
 936         4160 ,
 937         4170 ,
 938         4180 ,
 939         4190 ,
 940         4200 ,
 941         4210 ,
 942         4220 ,
 943         4230 ,
 944         4240 ,
 945         4250 ,
 946         4260 ,
 947         4270 ,
 948         4280 ,
 949         4290 ,
 950         4300 ,
 951         4310 ,
 952         4320 ,
 953         4330 ,
 954         4340 ,
 955         4350 ,
 956         4360 ,
 957         4370 ,
 958         4380 ,
 959         4390 ,
 960         4400 ,
 961         4410 ,
 962         4420 ,
 963         4430 ,
 964         4440 ,
 965         4450 ,
 966         4460 ,
 967         4470 ,
 968         4480 ,
 969         4490 ,
 970         4500 ,
 971         4510 ,
 972         4520 ,
 973         4530 ,
 974         4540 ,
 975         4550 ,
 976         4560 ,
 977         4570 ,
 978         4580 ,
 979         4590 ,
 980         4600 ,
 981 };
 982
 983 static int ab8500_voltage_to_regval(int voltage)
 984 {
 985         int i;
 986
 987         /* Special case for voltage below 3.5V */
 988         if (voltage < ab8500_charger_voltage_map[0])
 989                 return LOW_VOLT_REG;
 990
 991         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
 992                 if (voltage < ab8500_charger_voltage_map[i])
 993                         return i - 1;
 994         }
 995
 996         /* If not last element, return error */
 997         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
 998         if (voltage == ab8500_charger_voltage_map[i])
 999                 return i;
1000         else
1001                 return -1;
1002 }
1003
1004 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1005 {
1006         int i;
1007
1008         if (curr < di->bm->chg_output_curr[0])
1009                 return 0;
1010
1011         for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1012                 if (curr < di->bm->chg_output_curr[i])
1013                         return i - 1;
1014         }
1015
1016         /* If not last element, return error */
1017         i = di->bm->n_chg_out_curr - 1;
1018         if (curr == di->bm->chg_output_curr[i])
1019                 return i;
1020         else
1021                 return -1;
1022 }
1023
1024 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1025 {
1026         int i;
1027
1028         if (curr < di->bm->chg_input_curr[0])
1029                 return 0;
1030
1031         for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1032                 if (curr < di->bm->chg_input_curr[i])
1033                         return i - 1;
1034         }
1035
1036         /* If not last element, return error */
1037         i = di->bm->n_chg_in_curr - 1;
1038         if (curr == di->bm->chg_input_curr[i])
1039                 return i;
1040         else
1041                 return -1;
1042 }
1043
1044 /**
1045  * ab8500_charger_get_usb_cur() - get usb current
1046  * @di:         pointer to the ab8500_charger structre
1047  *
1048  * The usb stack provides the maximum current that can be drawn from
1049  * the standard usb host. This will be in mA.
1050  * This function converts current in mA to a value that can be written
1051  * to the register. Returns -1 if charging is not allowed
1052  */
1053 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1054 {
1055         int ret = 0;
1056         switch (di->usb_state.usb_current) {
1057         case 100:
1058                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1059                 break;
1060         case 200:
1061                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1062                 break;
1063         case 300:
1064                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1065                 break;
1066         case 400:
1067                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1068                 break;
1069         case 500:
1070                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1071                 break;
1072         default:
1073                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1074                 ret = -EPERM;
1075                 break;
1076         };
1077         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1078         return ret;
1079 }
1080
1081 /**
1082  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1083  * @di:         pointer to the ab8500_charger structure
1084  * @reg:        select what charger register to check
1085  *
1086  * Check if current stepping should be allowed to continue.
1087  * Checks if charger source has not collapsed. If it has, further stepping
1088  * is not allowed.
1089  */
1090 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1091                                                    int reg)
1092 {
1093         if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1094                 return !di->flags.vbus_drop_end;
1095         else
1096                 return true;
1097 }
1098
1099 /**
1100  * ab8500_charger_set_current() - set charger current
1101  * @di:         pointer to the ab8500_charger structure
1102  * @ich:        charger current, in mA
1103  * @reg:        select what charger register to set
1104  *
1105  * Set charger current.
1106  * There is no state machine in the AB to step up/down the charger
1107  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1108  * charging is started. Instead we need to implement
1109  * this charger current step-up/down here.
1110  * Returns error code in case of failure else 0(on success)
1111  */
1112 static int ab8500_charger_set_current(struct ab8500_charger *di,
1113         int ich, int reg)
1114 {
1115         int ret = 0;
1116         int curr_index, prev_curr_index, shift_value, i;
1117         u8 reg_value;
1118         u32 step_udelay;
1119         bool no_stepping = false;
1120
1121         atomic_inc(&di->current_stepping_sessions);
1122
1123         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1124                 reg, &reg_value);
1125         if (ret < 0) {
1126                 dev_err(di->dev, "%s read failed\n", __func__);
1127                 goto exit_set_current;
1128         }
1129
1130         switch (reg) {
1131         case AB8500_MCH_IPT_CURLVL_REG:
1132                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1133                 prev_curr_index = (reg_value >> shift_value);
1134                 curr_index = ab8500_current_to_regval(di, ich);
1135                 step_udelay = STEP_UDELAY;
1136                 if (!di->ac.charger_connected)
1137                         no_stepping = true;
1138                 break;
1139         case AB8500_USBCH_IPT_CRNTLVL_REG:
1140                 shift_value = VBUS_IN_CURR_LIM_SHIFT;
1141                 prev_curr_index = (reg_value >> shift_value);
1142                 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1143                 step_udelay = STEP_UDELAY * 100;
1144
1145                 if (!di->usb.charger_connected)
1146                         no_stepping = true;
1147                 break;
1148         case AB8500_CH_OPT_CRNTLVL_REG:
1149                 shift_value = 0;
1150                 prev_curr_index = (reg_value >> shift_value);
1151                 curr_index = ab8500_current_to_regval(di, ich);
1152                 step_udelay = STEP_UDELAY;
1153                 if (curr_index && (curr_index - prev_curr_index) > 1)
1154                         step_udelay *= 100;
1155
1156                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1157                         no_stepping = true;
1158
1159                 break;
1160         default:
1161                 dev_err(di->dev, "%s current register not valid\n", __func__);
1162                 ret = -ENXIO;
1163                 goto exit_set_current;
1164         }
1165
1166         if (curr_index < 0) {
1167                 dev_err(di->dev, "requested current limit out-of-range\n");
1168                 ret = -ENXIO;
1169                 goto exit_set_current;
1170         }
1171
1172         /* only update current if it's been changed */
1173         if (prev_curr_index == curr_index) {
1174                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1175                         __func__, reg);
1176                 ret = 0;
1177                 goto exit_set_current;
1178         }
1179
1180         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1181                 __func__, ich, reg);
1182
1183         if (no_stepping) {
1184                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1185                                         reg, (u8)curr_index << shift_value);
1186                 if (ret)
1187                         dev_err(di->dev, "%s write failed\n", __func__);
1188         } else if (prev_curr_index > curr_index) {
1189                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1190                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1191                                 (u8) i << shift_value, reg);
1192                         ret = abx500_set_register_interruptible(di->dev,
1193                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1194                         if (ret) {
1195                                 dev_err(di->dev, "%s write failed\n", __func__);
1196                                 goto exit_set_current;
1197                         }
1198                         if (i != curr_index)
1199                                 usleep_range(step_udelay, step_udelay * 2);
1200                 }
1201         } else {
1202                 bool allow = true;
1203                 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1204                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1205                                 (u8)i << shift_value, reg);
1206                         ret = abx500_set_register_interruptible(di->dev,
1207                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1208                         if (ret) {
1209                                 dev_err(di->dev, "%s write failed\n", __func__);
1210                                 goto exit_set_current;
1211                         }
1212                         if (i != curr_index)
1213                                 usleep_range(step_udelay, step_udelay * 2);
1214
1215                         allow = ab8500_charger_check_continue_stepping(di, reg);
1216                 }
1217         }
1218
1219 exit_set_current:
1220         atomic_dec(&di->current_stepping_sessions);
1221
1222         return ret;
1223 }
1224
1225 /**
1226  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1227  * @di:         pointer to the ab8500_charger structure
1228  * @ich_in:     charger input current limit
1229  *
1230  * Sets the current that can be drawn from the USB host
1231  * Returns error code in case of failure else 0(on success)
1232  */
1233 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1234                 int ich_in)
1235 {
1236         int min_value;
1237         int ret;
1238
1239         /* We should always use to lowest current limit */
1240         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1241         if (di->max_usb_in_curr.set_max > 0)
1242                 min_value = min(di->max_usb_in_curr.set_max, min_value);
1243
1244         if (di->usb_state.usb_current >= 0)
1245                 min_value = min(di->usb_state.usb_current, min_value);
1246
1247         switch (min_value) {
1248         case 100:
1249                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1250                         min_value = USB_CH_IP_CUR_LVL_0P05;
1251                 break;
1252         case 500:
1253                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1254                         min_value = USB_CH_IP_CUR_LVL_0P45;
1255                 break;
1256         default:
1257                 break;
1258         }
1259
1260         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1261
1262         mutex_lock(&di->usb_ipt_crnt_lock);
1263         ret = ab8500_charger_set_current(di, min_value,
1264                 AB8500_USBCH_IPT_CRNTLVL_REG);
1265         mutex_unlock(&di->usb_ipt_crnt_lock);
1266
1267         return ret;
1268 }
1269
1270 /**
1271  * ab8500_charger_set_main_in_curr() - set main charger input current
1272  * @di:         pointer to the ab8500_charger structure
1273  * @ich_in:     input charger current, in mA
1274  *
1275  * Set main charger input current.
1276  * Returns error code in case of failure else 0(on success)
1277  */
1278 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1279         int ich_in)
1280 {
1281         return ab8500_charger_set_current(di, ich_in,
1282                 AB8500_MCH_IPT_CURLVL_REG);
1283 }
1284
1285 /**
1286  * ab8500_charger_set_output_curr() - set charger output current
1287  * @di:         pointer to the ab8500_charger structure
1288  * @ich_out:    output charger current, in mA
1289  *
1290  * Set charger output current.
1291  * Returns error code in case of failure else 0(on success)
1292  */
1293 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1294         int ich_out)
1295 {
1296         return ab8500_charger_set_current(di, ich_out,
1297                 AB8500_CH_OPT_CRNTLVL_REG);
1298 }
1299
1300 /**
1301  * ab8500_charger_led_en() - turn on/off chargign led
1302  * @di:         pointer to the ab8500_charger structure
1303  * @on:         flag to turn on/off the chargign led
1304  *
1305  * Power ON/OFF charging LED indication
1306  * Returns error code in case of failure else 0(on success)
1307  */
1308 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1309 {
1310         int ret;
1311
1312         if (on) {
1313                 /* Power ON charging LED indicator, set LED current to 5mA */
1314                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1315                         AB8500_LED_INDICATOR_PWM_CTRL,
1316                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1317                 if (ret) {
1318                         dev_err(di->dev, "Power ON LED failed\n");
1319                         return ret;
1320                 }
1321                 /* LED indicator PWM duty cycle 252/256 */
1322                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1323                         AB8500_LED_INDICATOR_PWM_DUTY,
1324                         LED_INDICATOR_PWM_DUTY_252_256);
1325                 if (ret) {
1326                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1327                         return ret;
1328                 }
1329         } else {
1330                 /* Power off charging LED indicator */
1331                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1332                         AB8500_LED_INDICATOR_PWM_CTRL,
1333                         LED_INDICATOR_PWM_DIS);
1334                 if (ret) {
1335                         dev_err(di->dev, "Power-off LED failed\n");
1336                         return ret;
1337                 }
1338         }
1339
1340         return ret;
1341 }
1342
1343 /**
1344  * ab8500_charger_ac_en() - enable or disable ac charging
1345  * @di:         pointer to the ab8500_charger structure
1346  * @enable:     enable/disable flag
1347  * @vset:       charging voltage
1348  * @iset:       charging current
1349  *
1350  * Enable/Disable AC/Mains charging and turns on/off the charging led
1351  * respectively.
1352  **/
1353 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1354         int enable, int vset, int iset)
1355 {
1356         int ret;
1357         int volt_index;
1358         int curr_index;
1359         int input_curr_index;
1360         u8 overshoot = 0;
1361
1362         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1363
1364         if (enable) {
1365                 /* Check if AC is connected */
1366                 if (!di->ac.charger_connected) {
1367                         dev_err(di->dev, "AC charger not connected\n");
1368                         return -ENXIO;
1369                 }
1370
1371                 /* Enable AC charging */
1372                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1373
1374                 /*
1375                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1376                  * will be triggered everytime we enable the VDD ADC supply.
1377                  * This will turn off charging for a short while.
1378                  * It can be avoided by having the supply on when
1379                  * there is a charger enabled. Normally the VDD ADC supply
1380                  * is enabled everytime a GPADC conversion is triggered. We will
1381                  * force it to be enabled from this driver to have
1382                  * the GPADC module independant of the AB8500 chargers
1383                  */
1384                 if (!di->vddadc_en_ac) {
1385                         ret = regulator_enable(di->regu);
1386                         if (ret)
1387                                 dev_warn(di->dev,
1388                                         "Failed to enable regulator\n");
1389                         else
1390                                 di->vddadc_en_ac = true;
1391                 }
1392
1393                 /* Check if the requested voltage or current is valid */
1394                 volt_index = ab8500_voltage_to_regval(vset);
1395                 curr_index = ab8500_current_to_regval(di, iset);
1396                 input_curr_index = ab8500_current_to_regval(di,
1397                         di->bm->chg_params->ac_curr_max);
1398                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1399                         dev_err(di->dev,
1400                                 "Charger voltage or current too high, "
1401                                 "charging not started\n");
1402                         return -ENXIO;
1403                 }
1404
1405                 /* ChVoltLevel: maximum battery charging voltage */
1406                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1407                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1408                 if (ret) {
1409                         dev_err(di->dev, "%s write failed\n", __func__);
1410                         return ret;
1411                 }
1412                 /* MainChInputCurr: current that can be drawn from the charger*/
1413                 ret = ab8500_charger_set_main_in_curr(di,
1414                         di->bm->chg_params->ac_curr_max);
1415                 if (ret) {
1416                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1417                                 __func__);
1418                         return ret;
1419                 }
1420                 /* ChOutputCurentLevel: protected output current */
1421                 ret = ab8500_charger_set_output_curr(di, iset);
1422                 if (ret) {
1423                         dev_err(di->dev, "%s "
1424                                 "Failed to set ChOutputCurentLevel\n",
1425                                 __func__);
1426                         return ret;
1427                 }
1428
1429                 /* Check if VBAT overshoot control should be enabled */
1430                 if (!di->bm->enable_overshoot)
1431                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1432
1433                 /* Enable Main Charger */
1434                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1435                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1436                 if (ret) {
1437                         dev_err(di->dev, "%s write failed\n", __func__);
1438                         return ret;
1439                 }
1440
1441                 /* Power on charging LED indication */
1442                 ret = ab8500_charger_led_en(di, true);
1443                 if (ret < 0)
1444                         dev_err(di->dev, "failed to enable LED\n");
1445
1446                 di->ac.charger_online = 1;
1447         } else {
1448                 /* Disable AC charging */
1449                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1450                         /*
1451                          * For ABB revision 1.0 and 1.1 there is a bug in the
1452                          * watchdog logic. That means we have to continously
1453                          * kick the charger watchdog even when no charger is
1454                          * connected. This is only valid once the AC charger
1455                          * has been enabled. This is a bug that is not handled
1456                          * by the algorithm and the watchdog have to be kicked
1457                          * by the charger driver when the AC charger
1458                          * is disabled
1459                          */
1460                         if (di->ac_conn) {
1461                                 queue_delayed_work(di->charger_wq,
1462                                         &di->kick_wd_work,
1463                                         round_jiffies(WD_KICK_INTERVAL));
1464                         }
1465
1466                         /*
1467                          * We can't turn off charging completely
1468                          * due to a bug in AB8500 cut1.
1469                          * If we do, charging will not start again.
1470                          * That is why we set the lowest voltage
1471                          * and current possible
1472                          */
1473                         ret = abx500_set_register_interruptible(di->dev,
1474                                 AB8500_CHARGER,
1475                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1476                         if (ret) {
1477                                 dev_err(di->dev,
1478                                         "%s write failed\n", __func__);
1479                                 return ret;
1480                         }
1481
1482                         ret = ab8500_charger_set_output_curr(di, 0);
1483                         if (ret) {
1484                                 dev_err(di->dev, "%s "
1485                                         "Failed to set ChOutputCurentLevel\n",
1486                                         __func__);
1487                                 return ret;
1488                         }
1489                 } else {
1490                         ret = abx500_set_register_interruptible(di->dev,
1491                                 AB8500_CHARGER,
1492                                 AB8500_MCH_CTRL1, 0);
1493                         if (ret) {
1494                                 dev_err(di->dev,
1495                                         "%s write failed\n", __func__);
1496                                 return ret;
1497                         }
1498                 }
1499
1500                 ret = ab8500_charger_led_en(di, false);
1501                 if (ret < 0)
1502                         dev_err(di->dev, "failed to disable LED\n");
1503
1504                 di->ac.charger_online = 0;
1505                 di->ac.wd_expired = false;
1506
1507                 /* Disable regulator if enabled */
1508                 if (di->vddadc_en_ac) {
1509                         regulator_disable(di->regu);
1510                         di->vddadc_en_ac = false;
1511                 }
1512
1513                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1514         }
1515         ab8500_power_supply_changed(di, di->ac_chg.psy);
1516
1517         return ret;
1518 }
1519
1520 /**
1521  * ab8500_charger_usb_en() - enable usb charging
1522  * @di:         pointer to the ab8500_charger structure
1523  * @enable:     enable/disable flag
1524  * @vset:       charging voltage
1525  * @ich_out:    charger output current
1526  *
1527  * Enable/Disable USB charging and turns on/off the charging led respectively.
1528  * Returns error code in case of failure else 0(on success)
1529  */
1530 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1531         int enable, int vset, int ich_out)
1532 {
1533         int ret;
1534         int volt_index;
1535         int curr_index;
1536         u8 overshoot = 0;
1537
1538         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1539
1540         if (enable) {
1541                 /* Check if USB is connected */
1542                 if (!di->usb.charger_connected) {
1543                         dev_err(di->dev, "USB charger not connected\n");
1544                         return -ENXIO;
1545                 }
1546
1547                 /*
1548                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1549                  * will be triggered everytime we enable the VDD ADC supply.
1550                  * This will turn off charging for a short while.
1551                  * It can be avoided by having the supply on when
1552                  * there is a charger enabled. Normally the VDD ADC supply
1553                  * is enabled everytime a GPADC conversion is triggered. We will
1554                  * force it to be enabled from this driver to have
1555                  * the GPADC module independant of the AB8500 chargers
1556                  */
1557                 if (!di->vddadc_en_usb) {
1558                         ret = regulator_enable(di->regu);
1559                         if (ret)
1560                                 dev_warn(di->dev,
1561                                         "Failed to enable regulator\n");
1562                         else
1563                                 di->vddadc_en_usb = true;
1564                 }
1565
1566                 /* Enable USB charging */
1567                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1568
1569                 /* Check if the requested voltage or current is valid */
1570                 volt_index = ab8500_voltage_to_regval(vset);
1571                 curr_index = ab8500_current_to_regval(di, ich_out);
1572                 if (volt_index < 0 || curr_index < 0) {
1573                         dev_err(di->dev,
1574                                 "Charger voltage or current too high, "
1575                                 "charging not started\n");
1576                         return -ENXIO;
1577                 }
1578
1579                 /* ChVoltLevel: max voltage upto which battery can be charged */
1580                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1581                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1582                 if (ret) {
1583                         dev_err(di->dev, "%s write failed\n", __func__);
1584                         return ret;
1585                 }
1586                 /* Check if VBAT overshoot control should be enabled */
1587                 if (!di->bm->enable_overshoot)
1588                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1589
1590                 /* Enable USB Charger */
1591                 dev_dbg(di->dev,
1592                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1593                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1594                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1595                 if (ret) {
1596                         dev_err(di->dev, "%s write failed\n", __func__);
1597                         return ret;
1598                 }
1599
1600                 /* If success power on charging LED indication */
1601                 ret = ab8500_charger_led_en(di, true);
1602                 if (ret < 0)
1603                         dev_err(di->dev, "failed to enable LED\n");
1604
1605                 di->usb.charger_online = 1;
1606
1607                 /* USBChInputCurr: current that can be drawn from the usb */
1608                 ret = ab8500_charger_set_vbus_in_curr(di,
1609                                         di->max_usb_in_curr.usb_type_max);
1610                 if (ret) {
1611                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1612                         return ret;
1613                 }
1614
1615                 /* ChOutputCurentLevel: protected output current */
1616                 ret = ab8500_charger_set_output_curr(di, ich_out);
1617                 if (ret) {
1618                         dev_err(di->dev, "%s "
1619                                 "Failed to set ChOutputCurentLevel\n",
1620                                 __func__);
1621                         return ret;
1622                 }
1623
1624                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1625
1626         } else {
1627                 /* Disable USB charging */
1628                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1629                 ret = abx500_set_register_interruptible(di->dev,
1630                         AB8500_CHARGER,
1631                         AB8500_USBCH_CTRL1_REG, 0);
1632                 if (ret) {
1633                         dev_err(di->dev,
1634                                 "%s write failed\n", __func__);
1635                         return ret;
1636                 }
1637
1638                 ret = ab8500_charger_led_en(di, false);
1639                 if (ret < 0)
1640                         dev_err(di->dev, "failed to disable LED\n");
1641                 /* USBChInputCurr: current that can be drawn from the usb */
1642                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1643                 if (ret) {
1644                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1645                         return ret;
1646                 }
1647
1648                 /* ChOutputCurentLevel: protected output current */
1649                 ret = ab8500_charger_set_output_curr(di, 0);
1650                 if (ret) {
1651                         dev_err(di->dev, "%s "
1652                                 "Failed to reset ChOutputCurentLevel\n",
1653                                 __func__);
1654                         return ret;
1655                 }
1656                 di->usb.charger_online = 0;
1657                 di->usb.wd_expired = false;
1658
1659                 /* Disable regulator if enabled */
1660                 if (di->vddadc_en_usb) {
1661                         regulator_disable(di->regu);
1662                         di->vddadc_en_usb = false;
1663                 }
1664
1665                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1666
1667                 /* Cancel any pending Vbat check work */
1668                 cancel_delayed_work(&di->check_vbat_work);
1669
1670         }
1671         ab8500_power_supply_changed(di, di->usb_chg.psy);
1672
1673         return ret;
1674 }
1675
1676 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1677                                 unsigned long event, void *data)
1678 {
1679         int ret;
1680         struct device *dev = data;
1681         /*Toggle External charger control pin*/
1682         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1683                                   AB8500_SYS_CHARGER_CONTROL_REG,
1684                                   EXTERNAL_CHARGER_DISABLE_REG_VAL);
1685         if (ret < 0) {
1686                 dev_err(dev, "write reg failed %d\n", ret);
1687                 goto out;
1688         }
1689         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1690                                   AB8500_SYS_CHARGER_CONTROL_REG,
1691                                   EXTERNAL_CHARGER_ENABLE_REG_VAL);
1692         if (ret < 0)
1693                 dev_err(dev, "Write reg failed %d\n", ret);
1694
1695 out:
1696         return ret;
1697 }
1698
1699 /**
1700  * ab8500_charger_usb_check_enable() - enable usb charging
1701  * @charger:    pointer to the ux500_charger structure
1702  * @vset:       charging voltage
1703  * @iset:       charger output current
1704  *
1705  * Check if the VBUS charger has been disconnected and reconnected without
1706  * AB8500 rising an interrupt. Returns 0 on success.
1707  */
1708 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1709         int vset, int iset)
1710 {
1711         u8 usbch_ctrl1 = 0;
1712         int ret = 0;
1713
1714         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1715
1716         if (!di->usb.charger_connected)
1717                 return ret;
1718
1719         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1720                                 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1721         if (ret < 0) {
1722                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1723                 return ret;
1724         }
1725         dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1726
1727         if (!(usbch_ctrl1 & USB_CH_ENA)) {
1728                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1729
1730                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1731                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1732                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1733                 if (ret < 0) {
1734                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1735                         return ret;
1736                 }
1737
1738                 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1739                 if (ret < 0) {
1740                         dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1741                                         __LINE__);
1742                         return ret;
1743                 }
1744         }
1745         return ret;
1746 }
1747
1748 /**
1749  * ab8500_charger_ac_check_enable() - enable usb charging
1750  * @charger:    pointer to the ux500_charger structure
1751  * @vset:       charging voltage
1752  * @iset:       charger output current
1753  *
1754  * Check if the AC charger has been disconnected and reconnected without
1755  * AB8500 rising an interrupt. Returns 0 on success.
1756  */
1757 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1758         int vset, int iset)
1759 {
1760         u8 mainch_ctrl1 = 0;
1761         int ret = 0;
1762
1763         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1764
1765         if (!di->ac.charger_connected)
1766                 return ret;
1767
1768         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1769                                 AB8500_MCH_CTRL1, &mainch_ctrl1);
1770         if (ret < 0) {
1771                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1772                 return ret;
1773         }
1774         dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1775
1776         if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1777                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1778
1779                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1780                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1781                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1782
1783                 if (ret < 0) {
1784                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1785                         return ret;
1786                 }
1787
1788                 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1789                 if (ret < 0) {
1790                         dev_err(di->dev, "failed to enable AC charger %d\n",
1791                                 __LINE__);
1792                         return ret;
1793                 }
1794         }
1795         return ret;
1796 }
1797
1798 /**
1799  * ab8500_charger_watchdog_kick() - kick charger watchdog
1800  * @di:         pointer to the ab8500_charger structure
1801  *
1802  * Kick charger watchdog
1803  * Returns error code in case of failure else 0(on success)
1804  */
1805 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1806 {
1807         int ret;
1808         struct ab8500_charger *di;
1809
1810         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1811                 di = to_ab8500_charger_ac_device_info(charger);
1812         else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1813                 di = to_ab8500_charger_usb_device_info(charger);
1814         else
1815                 return -ENXIO;
1816
1817         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1818                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1819         if (ret)
1820                 dev_err(di->dev, "Failed to kick WD!\n");
1821
1822         return ret;
1823 }
1824
1825 /**
1826  * ab8500_charger_update_charger_current() - update charger current
1827  * @di:         pointer to the ab8500_charger structure
1828  *
1829  * Update the charger output current for the specified charger
1830  * Returns error code in case of failure else 0(on success)
1831  */
1832 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1833                 int ich_out)
1834 {
1835         int ret;
1836         struct ab8500_charger *di;
1837
1838         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1839                 di = to_ab8500_charger_ac_device_info(charger);
1840         else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1841                 di = to_ab8500_charger_usb_device_info(charger);
1842         else
1843                 return -ENXIO;
1844
1845         ret = ab8500_charger_set_output_curr(di, ich_out);
1846         if (ret) {
1847                 dev_err(di->dev, "%s "
1848                         "Failed to set ChOutputCurentLevel\n",
1849                         __func__);
1850                 return ret;
1851         }
1852
1853         /* Reset the main and usb drop input current measurement counter */
1854         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1855                                 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1856         if (ret) {
1857                 dev_err(di->dev, "%s write failed\n", __func__);
1858                 return ret;
1859         }
1860
1861         return ret;
1862 }
1863
1864 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1865 {
1866         struct power_supply *psy;
1867         struct power_supply *ext = dev_get_drvdata(dev);
1868         const char **supplicants = (const char **)ext->supplied_to;
1869         struct ab8500_charger *di;
1870         union power_supply_propval ret;
1871         int j;
1872         struct ux500_charger *usb_chg;
1873
1874         usb_chg = (struct ux500_charger *)data;
1875         psy = usb_chg->psy;
1876
1877         di = to_ab8500_charger_usb_device_info(usb_chg);
1878
1879         /* For all psy where the driver name appears in any supplied_to */
1880         j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
1881         if (j < 0)
1882                 return 0;
1883
1884         /* Go through all properties for the psy */
1885         for (j = 0; j < ext->desc->num_properties; j++) {
1886                 enum power_supply_property prop;
1887                 prop = ext->desc->properties[j];
1888
1889                 if (power_supply_get_property(ext, prop, &ret))
1890                         continue;
1891
1892                 switch (prop) {
1893                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1894                         switch (ext->desc->type) {
1895                         case POWER_SUPPLY_TYPE_BATTERY:
1896                                 di->vbat = ret.intval / 1000;
1897                                 break;
1898                         default:
1899                                 break;
1900                         }
1901                         break;
1902                 default:
1903                         break;
1904                 }
1905         }
1906         return 0;
1907 }
1908
1909 /**
1910  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1911  * @work        pointer to the work_struct structure
1912  *
1913  * Due to a asic bug it is necessary to lower the input current to the vbus
1914  * charger when charging with at some specific levels. This issue is only valid
1915  * for below a certain battery voltage. This function makes sure that the
1916  * the allowed current limit isn't exceeded.
1917  */
1918 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1919 {
1920         int t = 10;
1921         struct ab8500_charger *di = container_of(work,
1922                 struct ab8500_charger, check_vbat_work.work);
1923
1924         class_for_each_device(power_supply_class, NULL,
1925                 di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1926
1927         /* First run old_vbat is 0. */
1928         if (di->old_vbat == 0)
1929                 di->old_vbat = di->vbat;
1930
1931         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1932                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1933                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1934                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1935
1936                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
1937                         " old: %d\n", di->max_usb_in_curr.usb_type_max,
1938                         di->vbat, di->old_vbat);
1939                 ab8500_charger_set_vbus_in_curr(di,
1940                                         di->max_usb_in_curr.usb_type_max);
1941                 power_supply_changed(di->usb_chg.psy);
1942         }
1943
1944         di->old_vbat = di->vbat;
1945
1946         /*
1947          * No need to check the battery voltage every second when not close to
1948          * the threshold.
1949          */
1950         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
1951                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
1952                         t = 1;
1953
1954         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
1955 }
1956
1957 /**
1958  * ab8500_charger_check_hw_failure_work() - check main charger failure
1959  * @work:       pointer to the work_struct structure
1960  *
1961  * Work queue function for checking the main charger status
1962  */
1963 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
1964 {
1965         int ret;
1966         u8 reg_value;
1967
1968         struct ab8500_charger *di = container_of(work,
1969                 struct ab8500_charger, check_hw_failure_work.work);
1970
1971         /* Check if the status bits for HW failure is still active */
1972         if (di->flags.mainextchnotok) {
1973                 ret = abx500_get_register_interruptible(di->dev,
1974                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
1975                 if (ret < 0) {
1976                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1977                         return;
1978                 }
1979                 if (!(reg_value & MAIN_CH_NOK)) {
1980                         di->flags.mainextchnotok = false;
1981                         ab8500_power_supply_changed(di, di->ac_chg.psy);
1982                 }
1983         }
1984         if (di->flags.vbus_ovv) {
1985                 ret = abx500_get_register_interruptible(di->dev,
1986                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
1987                         &reg_value);
1988                 if (ret < 0) {
1989                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1990                         return;
1991                 }
1992                 if (!(reg_value & VBUS_OVV_TH)) {
1993                         di->flags.vbus_ovv = false;
1994                         ab8500_power_supply_changed(di, di->usb_chg.psy);
1995                 }
1996         }
1997         /* If we still have a failure, schedule a new check */
1998         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
1999                 queue_delayed_work(di->charger_wq,
2000                         &di->check_hw_failure_work, round_jiffies(HZ));
2001         }
2002 }
2003
2004 /**
2005  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2006  * @work:       pointer to the work_struct structure
2007  *
2008  * Work queue function for kicking the charger watchdog.
2009  *
2010  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2011  * logic. That means we have to continously kick the charger
2012  * watchdog even when no charger is connected. This is only
2013  * valid once the AC charger has been enabled. This is
2014  * a bug that is not handled by the algorithm and the
2015  * watchdog have to be kicked by the charger driver
2016  * when the AC charger is disabled
2017  */
2018 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2019 {
2020         int ret;
2021
2022         struct ab8500_charger *di = container_of(work,
2023                 struct ab8500_charger, kick_wd_work.work);
2024
2025         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2026                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2027         if (ret)
2028                 dev_err(di->dev, "Failed to kick WD!\n");
2029
2030         /* Schedule a new watchdog kick */
2031         queue_delayed_work(di->charger_wq,
2032                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2033 }
2034
2035 /**
2036  * ab8500_charger_ac_work() - work to get and set main charger status
2037  * @work:       pointer to the work_struct structure
2038  *
2039  * Work queue function for checking the main charger status
2040  */
2041 static void ab8500_charger_ac_work(struct work_struct *work)
2042 {
2043         int ret;
2044
2045         struct ab8500_charger *di = container_of(work,
2046                 struct ab8500_charger, ac_work);
2047
2048         /*
2049          * Since we can't be sure that the events are received
2050          * synchronously, we have the check if the main charger is
2051          * connected by reading the status register
2052          */
2053         ret = ab8500_charger_detect_chargers(di, false);
2054         if (ret < 0)
2055                 return;
2056
2057         if (ret & AC_PW_CONN) {
2058                 di->ac.charger_connected = 1;
2059                 di->ac_conn = true;
2060         } else {
2061                 di->ac.charger_connected = 0;
2062         }
2063
2064         ab8500_power_supply_changed(di, di->ac_chg.psy);
2065         sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
2066 }
2067
2068 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2069 {
2070         struct ab8500_charger *di = container_of(work,
2071                                                  struct ab8500_charger,
2072                                                  usb_charger_attached_work.work);
2073         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2074         int ret, i;
2075         u8 statval;
2076
2077         for (i = 0; i < 10; i++) {
2078                 ret = abx500_get_register_interruptible(di->dev,
2079                                                         AB8500_CHARGER,
2080                                                         AB8500_CH_USBCH_STAT1_REG,
2081                                                         &statval);
2082                 if (ret < 0) {
2083                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2084                         goto reschedule;
2085                 }
2086                 if ((statval & usbch) != usbch)
2087                         goto reschedule;
2088
2089                 msleep(CHARGER_STATUS_POLL);
2090         }
2091
2092         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2093
2094         mutex_lock(&di->charger_attached_mutex);
2095         mutex_unlock(&di->charger_attached_mutex);
2096
2097         return;
2098
2099 reschedule:
2100         queue_delayed_work(di->charger_wq,
2101                            &di->usb_charger_attached_work,
2102                            HZ);
2103 }
2104
2105 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2106 {
2107
2108         struct ab8500_charger *di = container_of(work,
2109                                                  struct ab8500_charger,
2110                                                  ac_charger_attached_work.work);
2111         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2112                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2113         int ret, i;
2114         u8 statval;
2115
2116         for (i = 0; i < 10; i++) {
2117                 ret = abx500_get_register_interruptible(di->dev,
2118                                                         AB8500_CHARGER,
2119                                                         AB8500_CH_STATUS2_REG,
2120                                                         &statval);
2121                 if (ret < 0) {
2122                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2123                         goto reschedule;
2124                 }
2125
2126                 if ((statval & mainch) != mainch)
2127                         goto reschedule;
2128
2129                 msleep(CHARGER_STATUS_POLL);
2130         }
2131
2132         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2133         queue_work(di->charger_wq, &di->ac_work);
2134
2135         mutex_lock(&di->charger_attached_mutex);
2136         mutex_unlock(&di->charger_attached_mutex);
2137
2138         return;
2139
2140 reschedule:
2141         queue_delayed_work(di->charger_wq,
2142                            &di->ac_charger_attached_work,
2143                            HZ);
2144 }
2145
2146 /**
2147  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2148  * @work:       Pointer to the work_struct structure
2149  *
2150  * Detect the type of USB plugged
2151  */
2152 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2153 {
2154         int ret;
2155
2156         struct ab8500_charger *di = container_of(work,
2157                 struct ab8500_charger, detect_usb_type_work);
2158
2159         /*
2160          * Since we can't be sure that the events are received
2161          * synchronously, we have the check if is
2162          * connected by reading the status register
2163          */
2164         ret = ab8500_charger_detect_chargers(di, false);
2165         if (ret < 0)
2166                 return;
2167
2168         if (!(ret & USB_PW_CONN)) {
2169                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2170                 di->vbus_detected = false;
2171                 ab8500_charger_set_usb_connected(di, false);
2172                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2173         } else {
2174                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2175                 di->vbus_detected = true;
2176
2177                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2178                         ret = ab8500_charger_detect_usb_type(di);
2179                         if (!ret) {
2180                                 ab8500_charger_set_usb_connected(di, true);
2181                                 ab8500_power_supply_changed(di,
2182                                                             di->usb_chg.psy);
2183                         }
2184                 } else {
2185                         /*
2186                          * For ABB cut2.0 and onwards we have an IRQ,
2187                          * USB_LINK_STATUS that will be triggered when the USB
2188                          * link status changes. The exception is USB connected
2189                          * during startup. Then we don't get a
2190                          * USB_LINK_STATUS IRQ
2191                          */
2192                         if (di->vbus_detected_start) {
2193                                 di->vbus_detected_start = false;
2194                                 ret = ab8500_charger_detect_usb_type(di);
2195                                 if (!ret) {
2196                                         ab8500_charger_set_usb_connected(di,
2197                                                 true);
2198                                         ab8500_power_supply_changed(di,
2199                                                 di->usb_chg.psy);
2200                                 }
2201                         }
2202                 }
2203         }
2204 }
2205
2206 /**
2207  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2208  * @work:       pointer to the work_struct structure
2209  *
2210  * Detect the type of USB plugged
2211  */
2212 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2213 {
2214         struct ab8500_charger *di =
2215                 container_of(work, struct ab8500_charger, attach_work.work);
2216         int ret;
2217
2218         /* Update maximum input current if USB enumeration is not detected */
2219         if (!di->usb.charger_online) {
2220                 ret = ab8500_charger_set_vbus_in_curr(di,
2221                                         di->max_usb_in_curr.usb_type_max);
2222                 if (ret)
2223                         return;
2224         }
2225
2226         ab8500_charger_set_usb_connected(di, true);
2227         ab8500_power_supply_changed(di, di->usb_chg.psy);
2228 }
2229
2230 /**
2231  * ab8500_charger_usb_link_status_work() - work to detect USB type
2232  * @work:       pointer to the work_struct structure
2233  *
2234  * Detect the type of USB plugged
2235  */
2236 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2237 {
2238         int detected_chargers;
2239         int ret;
2240         u8 val;
2241         u8 link_status;
2242
2243         struct ab8500_charger *di = container_of(work,
2244                 struct ab8500_charger, usb_link_status_work);
2245
2246         /*
2247          * Since we can't be sure that the events are received
2248          * synchronously, we have the check if  is
2249          * connected by reading the status register
2250          */
2251         detected_chargers = ab8500_charger_detect_chargers(di, false);
2252         if (detected_chargers < 0)
2253                 return;
2254
2255         /*
2256          * Some chargers that breaks the USB spec is
2257          * identified as invalid by AB8500 and it refuse
2258          * to start the charging process. but by jumping
2259          * thru a few hoops it can be forced to start.
2260          */
2261         if (is_ab8500(di->parent))
2262                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2263                                         AB8500_USB_LINE_STAT_REG, &val);
2264         else
2265                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2266                                         AB8500_USB_LINK1_STAT_REG, &val);
2267
2268         if (ret >= 0)
2269                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2270         else
2271                 dev_dbg(di->dev, "Error reading USB link status\n");
2272
2273         if (is_ab8500(di->parent))
2274                 link_status = AB8500_USB_LINK_STATUS;
2275         else
2276                 link_status = AB8505_USB_LINK_STATUS;
2277
2278         if (detected_chargers & USB_PW_CONN) {
2279                 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2280                                 USB_STAT_NOT_VALID_LINK &&
2281                                 di->invalid_charger_detect_state == 0) {
2282                         dev_dbg(di->dev,
2283                                         "Invalid charger detected, state= 0\n");
2284                         /*Enable charger*/
2285                         abx500_mask_and_set_register_interruptible(di->dev,
2286                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2287                                         USB_CH_ENA, USB_CH_ENA);
2288                         /*Enable charger detection*/
2289                         abx500_mask_and_set_register_interruptible(di->dev,
2290                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2291                                         USB_CH_DET, USB_CH_DET);
2292                         di->invalid_charger_detect_state = 1;
2293                         /*exit and wait for new link status interrupt.*/
2294                         return;
2295
2296                 }
2297                 if (di->invalid_charger_detect_state == 1) {
2298                         dev_dbg(di->dev,
2299                                         "Invalid charger detected, state= 1\n");
2300                         /*Stop charger detection*/
2301                         abx500_mask_and_set_register_interruptible(di->dev,
2302                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2303                                         USB_CH_DET, 0x00);
2304                         /*Check link status*/
2305                         if (is_ab8500(di->parent))
2306                                 ret = abx500_get_register_interruptible(di->dev,
2307                                         AB8500_USB, AB8500_USB_LINE_STAT_REG,
2308                                         &val);
2309                         else
2310                                 ret = abx500_get_register_interruptible(di->dev,
2311                                         AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2312                                         &val);
2313
2314                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2315                                 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2316                         di->invalid_charger_detect_state = 2;
2317                 }
2318         } else {
2319                 di->invalid_charger_detect_state = 0;
2320         }
2321
2322         if (!(detected_chargers & USB_PW_CONN)) {
2323                 di->vbus_detected = false;
2324                 ab8500_charger_set_usb_connected(di, false);
2325                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2326                 return;
2327         }
2328
2329         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2330         di->vbus_detected = true;
2331         ret = ab8500_charger_read_usb_type(di);
2332         if (ret) {
2333                 if (ret == -ENXIO) {
2334                         /* No valid charger type detected */
2335                         ab8500_charger_set_usb_connected(di, false);
2336                         ab8500_power_supply_changed(di, di->usb_chg.psy);
2337                 }
2338                 return;
2339         }
2340
2341         if (di->usb_device_is_unrecognised) {
2342                 dev_dbg(di->dev,
2343                         "Potential Legacy Charger device. "
2344                         "Delay work for %d msec for USB enum "
2345                         "to finish",
2346                         WAIT_ACA_RID_ENUMERATION);
2347                 queue_delayed_work(di->charger_wq,
2348                                    &di->attach_work,
2349                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2350         } else if (di->is_aca_rid == 1) {
2351                 /* Only wait once */
2352                 di->is_aca_rid++;
2353                 dev_dbg(di->dev,
2354                         "%s Wait %d msec for USB enum to finish",
2355                         __func__, WAIT_ACA_RID_ENUMERATION);
2356                 queue_delayed_work(di->charger_wq,
2357                                    &di->attach_work,
2358                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2359         } else {
2360                 queue_delayed_work(di->charger_wq,
2361                                    &di->attach_work,
2362                                    0);
2363         }
2364 }
2365
2366 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2367 {
2368         int ret;
2369         unsigned long flags;
2370
2371         struct ab8500_charger *di = container_of(work,
2372                 struct ab8500_charger, usb_state_changed_work.work);
2373
2374         if (!di->vbus_detected) {
2375                 dev_dbg(di->dev,
2376                         "%s !di->vbus_detected\n",
2377                         __func__);
2378                 return;
2379         }
2380
2381         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2382         di->usb_state.state = di->usb_state.state_tmp;
2383         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2384         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2385
2386         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2387                 __func__, di->usb_state.state, di->usb_state.usb_current);
2388
2389         switch (di->usb_state.state) {
2390         case AB8500_BM_USB_STATE_RESET_HS:
2391         case AB8500_BM_USB_STATE_RESET_FS:
2392         case AB8500_BM_USB_STATE_SUSPEND:
2393         case AB8500_BM_USB_STATE_MAX:
2394                 ab8500_charger_set_usb_connected(di, false);
2395                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2396                 break;
2397
2398         case AB8500_BM_USB_STATE_RESUME:
2399                 /*
2400                  * when suspend->resume there should be delay
2401                  * of 1sec for enabling charging
2402                  */
2403                 msleep(1000);
2404                 /* Intentional fall through */
2405         case AB8500_BM_USB_STATE_CONFIGURED:
2406                 /*
2407                  * USB is configured, enable charging with the charging
2408                  * input current obtained from USB driver
2409                  */
2410                 if (!ab8500_charger_get_usb_cur(di)) {
2411                         /* Update maximum input current */
2412                         ret = ab8500_charger_set_vbus_in_curr(di,
2413                                         di->max_usb_in_curr.usb_type_max);
2414                         if (ret)
2415                                 return;
2416
2417                         ab8500_charger_set_usb_connected(di, true);
2418                         ab8500_power_supply_changed(di, di->usb_chg.psy);
2419                 }
2420                 break;
2421
2422         default:
2423                 break;
2424         };
2425 }
2426
2427 /**
2428  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2429  * @work:       pointer to the work_struct structure
2430  *
2431  * Work queue function for checking the USB charger Not OK status
2432  */
2433 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2434 {
2435         int ret;
2436         u8 reg_value;
2437         bool prev_status;
2438
2439         struct ab8500_charger *di = container_of(work,
2440                 struct ab8500_charger, check_usbchgnotok_work.work);
2441
2442         /* Check if the status bit for usbchargernotok is still active */
2443         ret = abx500_get_register_interruptible(di->dev,
2444                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2445         if (ret < 0) {
2446                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2447                 return;
2448         }
2449         prev_status = di->flags.usbchargernotok;
2450
2451         if (reg_value & VBUS_CH_NOK) {
2452                 di->flags.usbchargernotok = true;
2453                 /* Check again in 1sec */
2454                 queue_delayed_work(di->charger_wq,
2455                         &di->check_usbchgnotok_work, HZ);
2456         } else {
2457                 di->flags.usbchargernotok = false;
2458                 di->flags.vbus_collapse = false;
2459         }
2460
2461         if (prev_status != di->flags.usbchargernotok)
2462                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2463 }
2464
2465 /**
2466  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2467  * @work:       pointer to the work_struct structure
2468  *
2469  * Work queue function for checking the Main thermal prot status
2470  */
2471 static void ab8500_charger_check_main_thermal_prot_work(
2472         struct work_struct *work)
2473 {
2474         int ret;
2475         u8 reg_value;
2476
2477         struct ab8500_charger *di = container_of(work,
2478                 struct ab8500_charger, check_main_thermal_prot_work);
2479
2480         /* Check if the status bit for main_thermal_prot is still active */
2481         ret = abx500_get_register_interruptible(di->dev,
2482                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2483         if (ret < 0) {
2484                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2485                 return;
2486         }
2487         if (reg_value & MAIN_CH_TH_PROT)
2488                 di->flags.main_thermal_prot = true;
2489         else
2490                 di->flags.main_thermal_prot = false;
2491
2492         ab8500_power_supply_changed(di, di->ac_chg.psy);
2493 }
2494
2495 /**
2496  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2497  * @work:       pointer to the work_struct structure
2498  *
2499  * Work queue function for checking the USB thermal prot status
2500  */
2501 static void ab8500_charger_check_usb_thermal_prot_work(
2502         struct work_struct *work)
2503 {
2504         int ret;
2505         u8 reg_value;
2506
2507         struct ab8500_charger *di = container_of(work,
2508                 struct ab8500_charger, check_usb_thermal_prot_work);
2509
2510         /* Check if the status bit for usb_thermal_prot is still active */
2511         ret = abx500_get_register_interruptible(di->dev,
2512                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2513         if (ret < 0) {
2514                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2515                 return;
2516         }
2517         if (reg_value & USB_CH_TH_PROT)
2518                 di->flags.usb_thermal_prot = true;
2519         else
2520                 di->flags.usb_thermal_prot = false;
2521
2522         ab8500_power_supply_changed(di, di->usb_chg.psy);
2523 }
2524
2525 /**
2526  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2527  * @irq:       interrupt number
2528  * @_di:       pointer to the ab8500_charger structure
2529  *
2530  * Returns IRQ status(IRQ_HANDLED)
2531  */
2532 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2533 {
2534         struct ab8500_charger *di = _di;
2535
2536         dev_dbg(di->dev, "Main charger unplugged\n");
2537         queue_work(di->charger_wq, &di->ac_work);
2538
2539         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2540         mutex_lock(&di->charger_attached_mutex);
2541         mutex_unlock(&di->charger_attached_mutex);
2542
2543         return IRQ_HANDLED;
2544 }
2545
2546 /**
2547  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2548  * @irq:       interrupt number
2549  * @_di:       pointer to the ab8500_charger structure
2550  *
2551  * Returns IRQ status(IRQ_HANDLED)
2552  */
2553 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2554 {
2555         struct ab8500_charger *di = _di;
2556
2557         dev_dbg(di->dev, "Main charger plugged\n");
2558         queue_work(di->charger_wq, &di->ac_work);
2559
2560         mutex_lock(&di->charger_attached_mutex);
2561         mutex_unlock(&di->charger_attached_mutex);
2562
2563         if (is_ab8500(di->parent))
2564                 queue_delayed_work(di->charger_wq,
2565                            &di->ac_charger_attached_work,
2566                            HZ);
2567         return IRQ_HANDLED;
2568 }
2569
2570 /**
2571  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2572  * @irq:       interrupt number
2573  * @_di:       pointer to the ab8500_charger structure
2574  *
2575  * Returns IRQ status(IRQ_HANDLED)
2576  */
2577 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2578 {
2579         struct ab8500_charger *di = _di;
2580
2581         dev_dbg(di->dev, "Main charger not ok\n");
2582         di->flags.mainextchnotok = true;
2583         ab8500_power_supply_changed(di, di->ac_chg.psy);
2584
2585         /* Schedule a new HW failure check */
2586         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2587
2588         return IRQ_HANDLED;
2589 }
2590
2591 /**
2592  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2593  * thermal protection threshold
2594  * @irq:       interrupt number
2595  * @_di:       pointer to the ab8500_charger structure
2596  *
2597  * Returns IRQ status(IRQ_HANDLED)
2598  */
2599 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2600 {
2601         struct ab8500_charger *di = _di;
2602
2603         dev_dbg(di->dev,
2604                 "Die temp above Main charger thermal protection threshold\n");
2605         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2606
2607         return IRQ_HANDLED;
2608 }
2609
2610 /**
2611  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2612  * thermal protection threshold
2613  * @irq:       interrupt number
2614  * @_di:       pointer to the ab8500_charger structure
2615  *
2616  * Returns IRQ status(IRQ_HANDLED)
2617  */
2618 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2619 {
2620         struct ab8500_charger *di = _di;
2621
2622         dev_dbg(di->dev,
2623                 "Die temp ok for Main charger thermal protection threshold\n");
2624         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2625
2626         return IRQ_HANDLED;
2627 }
2628
2629 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2630 {
2631         struct ab8500_charger *di = container_of(work,
2632                 struct ab8500_charger, vbus_drop_end_work.work);
2633         int ret, curr;
2634         u8 reg_value;
2635
2636         di->flags.vbus_drop_end = false;
2637
2638         /* Reset the drop counter */
2639         abx500_set_register_interruptible(di->dev,
2640                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2641
2642         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2643                         AB8500_CH_USBCH_STAT2_REG, &reg_value);
2644         if (ret < 0) {
2645                 dev_err(di->dev, "%s read failed\n", __func__);
2646                 return;
2647         }
2648
2649         curr = di->bm->chg_input_curr[
2650                 reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2651
2652         if (di->max_usb_in_curr.calculated_max != curr) {
2653                 /* USB source is collapsing */
2654                 di->max_usb_in_curr.calculated_max = curr;
2655                 dev_dbg(di->dev,
2656                          "VBUS input current limiting to %d mA\n",
2657                          di->max_usb_in_curr.calculated_max);
2658         } else {
2659                 /*
2660                  * USB source can not give more than this amount.
2661                  * Taking more will collapse the source.
2662                  */
2663                 di->max_usb_in_curr.set_max =
2664                         di->max_usb_in_curr.calculated_max;
2665                 dev_dbg(di->dev,
2666                          "VBUS input current limited to %d mA\n",
2667                          di->max_usb_in_curr.set_max);
2668         }
2669
2670         if (di->usb.charger_connected)
2671                 ab8500_charger_set_vbus_in_curr(di,
2672                                         di->max_usb_in_curr.usb_type_max);
2673 }
2674
2675 /**
2676  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2677  * @irq:       interrupt number
2678  * @_di:       pointer to the ab8500_charger structure
2679  *
2680  * Returns IRQ status(IRQ_HANDLED)
2681  */
2682 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2683 {
2684         struct ab8500_charger *di = _di;
2685
2686         di->vbus_detected = false;
2687         dev_dbg(di->dev, "VBUS falling detected\n");
2688         queue_work(di->charger_wq, &di->detect_usb_type_work);
2689
2690         return IRQ_HANDLED;
2691 }
2692
2693 /**
2694  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2695  * @irq:       interrupt number
2696  * @_di:       pointer to the ab8500_charger structure
2697  *
2698  * Returns IRQ status(IRQ_HANDLED)
2699  */
2700 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2701 {
2702         struct ab8500_charger *di = _di;
2703
2704         di->vbus_detected = true;
2705         dev_dbg(di->dev, "VBUS rising detected\n");
2706
2707         queue_work(di->charger_wq, &di->detect_usb_type_work);
2708
2709         return IRQ_HANDLED;
2710 }
2711
2712 /**
2713  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2714  * @irq:       interrupt number
2715  * @_di:       pointer to the ab8500_charger structure
2716  *
2717  * Returns IRQ status(IRQ_HANDLED)
2718  */
2719 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2720 {
2721         struct ab8500_charger *di = _di;
2722
2723         dev_dbg(di->dev, "USB link status changed\n");
2724
2725         queue_work(di->charger_wq, &di->usb_link_status_work);
2726
2727         return IRQ_HANDLED;
2728 }
2729
2730 /**
2731  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2732  * thermal protection threshold
2733  * @irq:       interrupt number
2734  * @_di:       pointer to the ab8500_charger structure
2735  *
2736  * Returns IRQ status(IRQ_HANDLED)
2737  */
2738 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2739 {
2740         struct ab8500_charger *di = _di;
2741
2742         dev_dbg(di->dev,
2743                 "Die temp above USB charger thermal protection threshold\n");
2744         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2745
2746         return IRQ_HANDLED;
2747 }
2748
2749 /**
2750  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2751  * thermal protection threshold
2752  * @irq:       interrupt number
2753  * @_di:       pointer to the ab8500_charger structure
2754  *
2755  * Returns IRQ status(IRQ_HANDLED)
2756  */
2757 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2758 {
2759         struct ab8500_charger *di = _di;
2760
2761         dev_dbg(di->dev,
2762                 "Die temp ok for USB charger thermal protection threshold\n");
2763         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2764
2765         return IRQ_HANDLED;
2766 }
2767
2768 /**
2769  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2770  * @irq:       interrupt number
2771  * @_di:       pointer to the ab8500_charger structure
2772  *
2773  * Returns IRQ status(IRQ_HANDLED)
2774  */
2775 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2776 {
2777         struct ab8500_charger *di = _di;
2778
2779         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2780         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2781
2782         return IRQ_HANDLED;
2783 }
2784
2785 /**
2786  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2787  * @irq:       interrupt number
2788  * @_di:       pointer to the ab8500_charger structure
2789  *
2790  * Returns IRQ status(IRQ_HANDLED)
2791  */
2792 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2793 {
2794         struct ab8500_charger *di = _di;
2795
2796         dev_dbg(di->dev, "Charger watchdog expired\n");
2797
2798         /*
2799          * The charger that was online when the watchdog expired
2800          * needs to be restarted for charging to start again
2801          */
2802         if (di->ac.charger_online) {
2803                 di->ac.wd_expired = true;
2804                 ab8500_power_supply_changed(di, di->ac_chg.psy);
2805         }
2806         if (di->usb.charger_online) {
2807                 di->usb.wd_expired = true;
2808                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2809         }
2810
2811         return IRQ_HANDLED;
2812 }
2813
2814 /**
2815  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2816  * @irq:       interrupt number
2817  * @_di:       pointer to the ab8500_charger structure
2818  *
2819  * Returns IRQ status(IRQ_HANDLED)
2820  */
2821 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2822 {
2823         struct ab8500_charger *di = _di;
2824
2825         dev_dbg(di->dev, "VBUS charger drop ended\n");
2826         di->flags.vbus_drop_end = true;
2827
2828         /*
2829          * VBUS might have dropped due to bad connection.
2830          * Schedule a new input limit set to the value SW requests.
2831          */
2832         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2833                            round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2834
2835         return IRQ_HANDLED;
2836 }
2837
2838 /**
2839  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2840  * @irq:       interrupt number
2841  * @_di:       pointer to the ab8500_charger structure
2842  *
2843  * Returns IRQ status(IRQ_HANDLED)
2844  */
2845 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2846 {
2847         struct ab8500_charger *di = _di;
2848
2849         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2850         di->flags.vbus_ovv = true;
2851         ab8500_power_supply_changed(di, di->usb_chg.psy);
2852
2853         /* Schedule a new HW failure check */
2854         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2855
2856         return IRQ_HANDLED;
2857 }
2858
2859 /**
2860  * ab8500_charger_ac_get_property() - get the ac/mains properties
2861  * @psy:       pointer to the power_supply structure
2862  * @psp:       pointer to the power_supply_property structure
2863  * @val:       pointer to the power_supply_propval union
2864  *
2865  * This function gets called when an application tries to get the ac/mains
2866  * properties by reading the sysfs files.
2867  * AC/Mains properties are online, present and voltage.
2868  * online:     ac/mains charging is in progress or not
2869  * present:    presence of the ac/mains
2870  * voltage:    AC/Mains voltage
2871  * Returns error code in case of failure else 0(on success)
2872  */
2873 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2874         enum power_supply_property psp,
2875         union power_supply_propval *val)
2876 {
2877         struct ab8500_charger *di;
2878         int ret;
2879
2880         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2881
2882         switch (psp) {
2883         case POWER_SUPPLY_PROP_HEALTH:
2884                 if (di->flags.mainextchnotok)
2885                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2886                 else if (di->ac.wd_expired || di->usb.wd_expired)
2887                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2888                 else if (di->flags.main_thermal_prot)
2889                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2890                 else
2891                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2892                 break;
2893         case POWER_SUPPLY_PROP_ONLINE:
2894                 val->intval = di->ac.charger_online;
2895                 break;
2896         case POWER_SUPPLY_PROP_PRESENT:
2897                 val->intval = di->ac.charger_connected;
2898                 break;
2899         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2900                 ret = ab8500_charger_get_ac_voltage(di);
2901                 if (ret >= 0)
2902                         di->ac.charger_voltage = ret;
2903                 /* On error, use previous value */
2904                 val->intval = di->ac.charger_voltage * 1000;
2905                 break;
2906         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2907                 /*
2908                  * This property is used to indicate when CV mode is entered
2909                  * for the AC charger
2910                  */
2911                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2912                 val->intval = di->ac.cv_active;
2913                 break;
2914         case POWER_SUPPLY_PROP_CURRENT_NOW:
2915                 ret = ab8500_charger_get_ac_current(di);
2916                 if (ret >= 0)
2917                         di->ac.charger_current = ret;
2918                 val->intval = di->ac.charger_current * 1000;
2919                 break;
2920         default:
2921                 return -EINVAL;
2922         }
2923         return 0;
2924 }
2925
2926 /**
2927  * ab8500_charger_usb_get_property() - get the usb properties
2928  * @psy:        pointer to the power_supply structure
2929  * @psp:        pointer to the power_supply_property structure
2930  * @val:        pointer to the power_supply_propval union
2931  *
2932  * This function gets called when an application tries to get the usb
2933  * properties by reading the sysfs files.
2934  * USB properties are online, present and voltage.
2935  * online:     usb charging is in progress or not
2936  * present:    presence of the usb
2937  * voltage:    vbus voltage
2938  * Returns error code in case of failure else 0(on success)
2939  */
2940 static int ab8500_charger_usb_get_property(struct power_supply *psy,
2941         enum power_supply_property psp,
2942         union power_supply_propval *val)
2943 {
2944         struct ab8500_charger *di;
2945         int ret;
2946
2947         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
2948
2949         switch (psp) {
2950         case POWER_SUPPLY_PROP_HEALTH:
2951                 if (di->flags.usbchargernotok)
2952                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2953                 else if (di->ac.wd_expired || di->usb.wd_expired)
2954                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2955                 else if (di->flags.usb_thermal_prot)
2956                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2957                 else if (di->flags.vbus_ovv)
2958                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
2959                 else
2960                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2961                 break;
2962         case POWER_SUPPLY_PROP_ONLINE:
2963                 val->intval = di->usb.charger_online;
2964                 break;
2965         case POWER_SUPPLY_PROP_PRESENT:
2966                 val->intval = di->usb.charger_connected;
2967                 break;
2968         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2969                 ret = ab8500_charger_get_vbus_voltage(di);
2970                 if (ret >= 0)
2971                         di->usb.charger_voltage = ret;
2972                 val->intval = di->usb.charger_voltage * 1000;
2973                 break;
2974         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2975                 /*
2976                  * This property is used to indicate when CV mode is entered
2977                  * for the USB charger
2978                  */
2979                 di->usb.cv_active = ab8500_charger_usb_cv(di);
2980                 val->intval = di->usb.cv_active;
2981                 break;
2982         case POWER_SUPPLY_PROP_CURRENT_NOW:
2983                 ret = ab8500_charger_get_usb_current(di);
2984                 if (ret >= 0)
2985                         di->usb.charger_current = ret;
2986                 val->intval = di->usb.charger_current * 1000;
2987                 break;
2988         case POWER_SUPPLY_PROP_CURRENT_AVG:
2989                 /*
2990                  * This property is used to indicate when VBUS has collapsed
2991                  * due to too high output current from the USB charger
2992                  */
2993                 if (di->flags.vbus_collapse)
2994                         val->intval = 1;
2995                 else
2996                         val->intval = 0;
2997                 break;
2998         default:
2999                 return -EINVAL;
3000         }
3001         return 0;
3002 }
3003
3004 /**
3005  * ab8500_charger_init_hw_registers() - Set up charger related registers
3006  * @di:         pointer to the ab8500_charger structure
3007  *
3008  * Set up charger OVV, watchdog and maximum voltage registers as well as
3009  * charging of the backup battery
3010  */
3011 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3012 {
3013         int ret = 0;
3014         u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3015
3016         /* Setup maximum charger current and voltage for ABB cut2.0 */
3017         if (!is_ab8500_1p1_or_earlier(di->parent)) {
3018                 ret = abx500_set_register_interruptible(di->dev,
3019                         AB8500_CHARGER,
3020                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3021                 if (ret) {
3022                         dev_err(di->dev,
3023                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
3024                         goto out;
3025                 }
3026
3027                 ret = abx500_set_register_interruptible(di->dev,
3028                         AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3029                         CH_OP_CUR_LVL_1P6);
3030                 if (ret) {
3031                         dev_err(di->dev,
3032                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3033                         goto out;
3034                 }
3035         }
3036
3037         if (is_ab8505_2p0(di->parent))
3038                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3039                         AB8500_CHARGER,
3040                         AB8500_USBCH_CTRL2_REG,
3041                         VBUS_AUTO_IN_CURR_LIM_ENA,
3042                         VBUS_AUTO_IN_CURR_LIM_ENA);
3043         else
3044                 /*
3045                  * VBUS OVV set to 6.3V and enable automatic current limitation
3046                  */
3047                 ret = abx500_set_register_interruptible(di->dev,
3048                         AB8500_CHARGER,
3049                         AB8500_USBCH_CTRL2_REG,
3050                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3051         if (ret) {
3052                 dev_err(di->dev,
3053                         "failed to set automatic current limitation\n");
3054                 goto out;
3055         }
3056
3057         /* Enable main watchdog in OTP */
3058         ret = abx500_set_register_interruptible(di->dev,
3059                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3060         if (ret) {
3061                 dev_err(di->dev, "failed to enable main WD in OTP\n");
3062                 goto out;
3063         }
3064
3065         /* Enable main watchdog */
3066         ret = abx500_set_register_interruptible(di->dev,
3067                 AB8500_SYS_CTRL2_BLOCK,
3068                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3069         if (ret) {
3070                 dev_err(di->dev, "failed to enable main watchdog\n");
3071                 goto out;
3072         }
3073
3074         /*
3075          * Due to internal synchronisation, Enable and Kick watchdog bits
3076          * cannot be enabled in a single write.
3077          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3078          * between writing Enable then Kick bits.
3079          */
3080         udelay(63);
3081
3082         /* Kick main watchdog */
3083         ret = abx500_set_register_interruptible(di->dev,
3084                 AB8500_SYS_CTRL2_BLOCK,
3085                 AB8500_MAIN_WDOG_CTRL_REG,
3086                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3087         if (ret) {
3088                 dev_err(di->dev, "failed to kick main watchdog\n");
3089                 goto out;
3090         }
3091
3092         /* Disable main watchdog */
3093         ret = abx500_set_register_interruptible(di->dev,
3094                 AB8500_SYS_CTRL2_BLOCK,
3095                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3096         if (ret) {
3097                 dev_err(di->dev, "failed to disable main watchdog\n");
3098                 goto out;
3099         }
3100
3101         /* Set watchdog timeout */
3102         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3103                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3104         if (ret) {
3105                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3106                 goto out;
3107         }
3108
3109         ret = ab8500_charger_led_en(di, false);
3110         if (ret < 0) {
3111                 dev_err(di->dev, "failed to disable LED\n");
3112                 goto out;
3113         }
3114
3115         /* Backup battery voltage and current */
3116         if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3117                 bup_vch_range = BUP_VCH_RANGE;
3118         if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3119                 vbup33_vrtcn = VBUP33_VRTCN;
3120
3121         ret = abx500_set_register_interruptible(di->dev,
3122                 AB8500_RTC,
3123                 AB8500_RTC_BACKUP_CHG_REG,
3124                 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3125         if (ret) {
3126                 dev_err(di->dev, "failed to setup backup battery charging\n");
3127                 goto out;
3128         }
3129
3130         /* Enable backup battery charging */
3131         ret = abx500_mask_and_set_register_interruptible(di->dev,
3132                 AB8500_RTC, AB8500_RTC_CTRL_REG,
3133                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3134         if (ret < 0) {
3135                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3136                 goto out;
3137         }
3138
3139 out:
3140         return ret;
3141 }
3142
3143 /*
3144  * ab8500 charger driver interrupts and their respective isr
3145  */
3146 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3147         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3148         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3149         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3150         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3151         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3152         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3153         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3154         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3155         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3156         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3157         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3158         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3159         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3160         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3161 };
3162
3163 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3164                 unsigned long event, void *power)
3165 {
3166         struct ab8500_charger *di =
3167                 container_of(nb, struct ab8500_charger, nb);
3168         enum ab8500_usb_state bm_usb_state;
3169         unsigned mA = *((unsigned *)power);
3170
3171         if (!di)
3172                 return NOTIFY_DONE;
3173
3174         if (event != USB_EVENT_VBUS) {
3175                 dev_dbg(di->dev, "not a standard host, returning\n");
3176                 return NOTIFY_DONE;
3177         }
3178
3179         /* TODO: State is fabricate  here. See if charger really needs USB
3180          * state or if mA is enough
3181          */
3182         if ((di->usb_state.usb_current == 2) && (mA > 2))
3183                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3184         else if (mA == 0)
3185                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3186         else if (mA == 2)
3187                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3188         else if (mA >= 8) /* 8, 100, 500 */
3189                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3190         else /* Should never occur */
3191                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3192
3193         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3194                 __func__, bm_usb_state, mA);
3195
3196         spin_lock(&di->usb_state.usb_lock);
3197         di->usb_state.state_tmp = bm_usb_state;
3198         di->usb_state.usb_current_tmp = mA;
3199         spin_unlock(&di->usb_state.usb_lock);
3200
3201         /*
3202          * wait for some time until you get updates from the usb stack
3203          * and negotiations are completed
3204          */
3205         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3206
3207         return NOTIFY_OK;
3208 }
3209
3210 #if defined(CONFIG_PM)
3211 static int ab8500_charger_resume(struct platform_device *pdev)
3212 {
3213         int ret;
3214         struct ab8500_charger *di = platform_get_drvdata(pdev);
3215
3216         /*
3217          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3218          * logic. That means we have to continously kick the charger
3219          * watchdog even when no charger is connected. This is only
3220          * valid once the AC charger has been enabled. This is
3221          * a bug that is not handled by the algorithm and the
3222          * watchdog have to be kicked by the charger driver
3223          * when the AC charger is disabled
3224          */
3225         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3226                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3227                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3228                 if (ret)
3229                         dev_err(di->dev, "Failed to kick WD!\n");
3230
3231                 /* If not already pending start a new timer */
3232                 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3233                                    round_jiffies(WD_KICK_INTERVAL));
3234         }
3235
3236         /* If we still have a HW failure, schedule a new check */
3237         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3238                 queue_delayed_work(di->charger_wq,
3239                         &di->check_hw_failure_work, 0);
3240         }
3241
3242         if (di->flags.vbus_drop_end)
3243                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3244
3245         return 0;
3246 }
3247
3248 static int ab8500_charger_suspend(struct platform_device *pdev,
3249         pm_message_t state)
3250 {
3251         struct ab8500_charger *di = platform_get_drvdata(pdev);
3252
3253         /* Cancel any pending jobs */
3254         cancel_delayed_work(&di->check_hw_failure_work);
3255         cancel_delayed_work(&di->vbus_drop_end_work);
3256
3257         flush_delayed_work(&di->attach_work);
3258         flush_delayed_work(&di->usb_charger_attached_work);
3259         flush_delayed_work(&di->ac_charger_attached_work);
3260         flush_delayed_work(&di->check_usbchgnotok_work);
3261         flush_delayed_work(&di->check_vbat_work);
3262         flush_delayed_work(&di->kick_wd_work);
3263
3264         flush_work(&di->usb_link_status_work);
3265         flush_work(&di->ac_work);
3266         flush_work(&di->detect_usb_type_work);
3267
3268         if (atomic_read(&di->current_stepping_sessions))
3269                 return -EAGAIN;
3270
3271         return 0;
3272 }
3273 #else
3274 #define ab8500_charger_suspend      NULL
3275 #define ab8500_charger_resume       NULL
3276 #endif
3277
3278 static struct notifier_block charger_nb = {
3279         .notifier_call = ab8500_external_charger_prepare,
3280 };
3281
3282 static int ab8500_charger_remove(struct platform_device *pdev)
3283 {
3284         struct ab8500_charger *di = platform_get_drvdata(pdev);
3285         int i, irq, ret;
3286
3287         /* Disable AC charging */
3288         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3289
3290         /* Disable USB charging */
3291         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3292
3293         /* Disable interrupts */
3294         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3295                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3296                 free_irq(irq, di);
3297         }
3298
3299         /* Backup battery voltage and current disable */
3300         ret = abx500_mask_and_set_register_interruptible(di->dev,
3301                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3302         if (ret < 0)
3303                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3304
3305         usb_unregister_notifier(di->usb_phy, &di->nb);
3306         usb_put_phy(di->usb_phy);
3307
3308         /* Delete the work queue */
3309         destroy_workqueue(di->charger_wq);
3310
3311         /* Unregister external charger enable notifier */
3312         if (!di->ac_chg.enabled)
3313                 blocking_notifier_chain_unregister(
3314                         &charger_notifier_list, &charger_nb);
3315
3316         flush_scheduled_work();
3317         if (di->usb_chg.enabled)
3318                 power_supply_unregister(di->usb_chg.psy);
3319
3320         if (di->ac_chg.enabled && !di->ac_chg.external)
3321                 power_supply_unregister(di->ac_chg.psy);
3322
3323         return 0;
3324 }
3325
3326 static char *supply_interface[] = {
3327         "ab8500_chargalg",
3328         "ab8500_fg",
3329         "ab8500_btemp",
3330 };
3331
3332 static const struct power_supply_desc ab8500_ac_chg_desc = {
3333         .name           = "ab8500_ac",
3334         .type           = POWER_SUPPLY_TYPE_MAINS,
3335         .properties     = ab8500_charger_ac_props,
3336         .num_properties = ARRAY_SIZE(ab8500_charger_ac_props),
3337         .get_property   = ab8500_charger_ac_get_property,
3338 };
3339
3340 static const struct power_supply_desc ab8500_usb_chg_desc = {
3341         .name           = "ab8500_usb",
3342         .type           = POWER_SUPPLY_TYPE_USB,
3343         .properties     = ab8500_charger_usb_props,
3344         .num_properties = ARRAY_SIZE(ab8500_charger_usb_props),
3345         .get_property   = ab8500_charger_usb_get_property,
3346 };
3347
3348 static int ab8500_charger_probe(struct platform_device *pdev)
3349 {
3350         struct device_node *np = pdev->dev.of_node;
3351         struct abx500_bm_data *plat = pdev->dev.platform_data;
3352         struct power_supply_config ac_psy_cfg = {}, usb_psy_cfg = {};
3353         struct ab8500_charger *di;
3354         int irq, i, charger_status, ret = 0, ch_stat;
3355
3356         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3357         if (!di) {
3358                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3359                 return -ENOMEM;
3360         }
3361
3362         if (!plat) {
3363                 dev_err(&pdev->dev, "no battery management data supplied\n");
3364                 return -EINVAL;
3365         }
3366         di->bm = plat;
3367
3368         if (np) {
3369                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3370                 if (ret) {
3371                         dev_err(&pdev->dev, "failed to get battery information\n");
3372                         return ret;
3373                 }
3374                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3375         } else
3376                 di->autopower_cfg = false;
3377
3378         /* get parent data */
3379         di->dev = &pdev->dev;
3380         di->parent = dev_get_drvdata(pdev->dev.parent);
3381         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3382
3383         /* initialize lock */
3384         spin_lock_init(&di->usb_state.usb_lock);
3385         mutex_init(&di->usb_ipt_crnt_lock);
3386
3387         di->autopower = false;
3388         di->invalid_charger_detect_state = 0;
3389
3390         /* AC and USB supply config */
3391         ac_psy_cfg.supplied_to = supply_interface;
3392         ac_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3393         ac_psy_cfg.drv_data = &di->ac_chg;
3394         usb_psy_cfg.supplied_to = supply_interface;
3395         usb_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3396         usb_psy_cfg.drv_data = &di->usb_chg;
3397
3398         /* AC supply */
3399         /* ux500_charger sub-class */
3400         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3401         di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3402         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3403         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3404         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3405                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3406         di->ac_chg.max_out_curr =
3407                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3408         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3409         di->ac_chg.enabled = di->bm->ac_enabled;
3410         di->ac_chg.external = false;
3411
3412         /*notifier for external charger enabling*/
3413         if (!di->ac_chg.enabled)
3414                 blocking_notifier_chain_register(
3415                         &charger_notifier_list, &charger_nb);
3416
3417         /* USB supply */
3418         /* ux500_charger sub-class */
3419         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3420         di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3421         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3422         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3423         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3424                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3425         di->usb_chg.max_out_curr =
3426                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3427         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3428         di->usb_chg.enabled = di->bm->usb_enabled;
3429         di->usb_chg.external = false;
3430         di->usb_state.usb_current = -1;
3431
3432         /* Create a work queue for the charger */
3433         di->charger_wq = alloc_ordered_workqueue("ab8500_charger_wq",
3434                                                  WQ_MEM_RECLAIM);
3435         if (di->charger_wq == NULL) {
3436                 dev_err(di->dev, "failed to create work queue\n");
3437                 return -ENOMEM;
3438         }
3439
3440         mutex_init(&di->charger_attached_mutex);
3441
3442         /* Init work for HW failure check */
3443         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3444                 ab8500_charger_check_hw_failure_work);
3445         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3446                 ab8500_charger_check_usbchargernotok_work);
3447
3448         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3449                           ab8500_charger_ac_attached_work);
3450         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3451                           ab8500_charger_usb_attached_work);
3452
3453         /*
3454          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3455          * logic. That means we have to continously kick the charger
3456          * watchdog even when no charger is connected. This is only
3457          * valid once the AC charger has been enabled. This is
3458          * a bug that is not handled by the algorithm and the
3459          * watchdog have to be kicked by the charger driver
3460          * when the AC charger is disabled
3461          */
3462         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3463                 ab8500_charger_kick_watchdog_work);
3464
3465         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3466                 ab8500_charger_check_vbat_work);
3467
3468         INIT_DELAYED_WORK(&di->attach_work,
3469                 ab8500_charger_usb_link_attach_work);
3470
3471         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3472                 ab8500_charger_usb_state_changed_work);
3473
3474         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3475                 ab8500_charger_vbus_drop_end_work);
3476
3477         /* Init work for charger detection */
3478         INIT_WORK(&di->usb_link_status_work,
3479                 ab8500_charger_usb_link_status_work);
3480         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3481         INIT_WORK(&di->detect_usb_type_work,
3482                 ab8500_charger_detect_usb_type_work);
3483
3484         /* Init work for checking HW status */
3485         INIT_WORK(&di->check_main_thermal_prot_work,
3486                 ab8500_charger_check_main_thermal_prot_work);
3487         INIT_WORK(&di->check_usb_thermal_prot_work,
3488                 ab8500_charger_check_usb_thermal_prot_work);
3489
3490         /*
3491          * VDD ADC supply needs to be enabled from this driver when there
3492          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3493          * interrupts during charging
3494          */
3495         di->regu = devm_regulator_get(di->dev, "vddadc");
3496         if (IS_ERR(di->regu)) {
3497                 ret = PTR_ERR(di->regu);
3498                 dev_err(di->dev, "failed to get vddadc regulator\n");
3499                 goto free_charger_wq;
3500         }
3501
3502
3503         /* Initialize OVV, and other registers */
3504         ret = ab8500_charger_init_hw_registers(di);
3505         if (ret) {
3506                 dev_err(di->dev, "failed to initialize ABB registers\n");
3507                 goto free_charger_wq;
3508         }
3509
3510         /* Register AC charger class */
3511         if (di->ac_chg.enabled) {
3512                 di->ac_chg.psy = power_supply_register(di->dev,
3513                                                        &ab8500_ac_chg_desc,
3514                                                        &ac_psy_cfg);
3515                 if (IS_ERR(di->ac_chg.psy)) {
3516                         dev_err(di->dev, "failed to register AC charger\n");
3517                         ret = PTR_ERR(di->ac_chg.psy);
3518                         goto free_charger_wq;
3519                 }
3520         }
3521
3522         /* Register USB charger class */
3523         if (di->usb_chg.enabled) {
3524                 di->usb_chg.psy = power_supply_register(di->dev,
3525                                                         &ab8500_usb_chg_desc,
3526                                                         &usb_psy_cfg);
3527                 if (IS_ERR(di->usb_chg.psy)) {
3528                         dev_err(di->dev, "failed to register USB charger\n");
3529                         ret = PTR_ERR(di->usb_chg.psy);
3530                         goto free_ac;
3531                 }
3532         }
3533
3534         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3535         if (IS_ERR_OR_NULL(di->usb_phy)) {
3536                 dev_err(di->dev, "failed to get usb transceiver\n");
3537                 ret = -EINVAL;
3538                 goto free_usb;
3539         }
3540         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3541         ret = usb_register_notifier(di->usb_phy, &di->nb);
3542         if (ret) {
3543                 dev_err(di->dev, "failed to register usb notifier\n");
3544                 goto put_usb_phy;
3545         }
3546
3547         /* Identify the connected charger types during startup */
3548         charger_status = ab8500_charger_detect_chargers(di, true);
3549         if (charger_status & AC_PW_CONN) {
3550                 di->ac.charger_connected = 1;
3551                 di->ac_conn = true;
3552                 ab8500_power_supply_changed(di, di->ac_chg.psy);
3553                 sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
3554         }
3555
3556         if (charger_status & USB_PW_CONN) {
3557                 di->vbus_detected = true;
3558                 di->vbus_detected_start = true;
3559                 queue_work(di->charger_wq,
3560                         &di->detect_usb_type_work);
3561         }
3562
3563         /* Register interrupts */
3564         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3565                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3566                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3567                         IRQF_SHARED | IRQF_NO_SUSPEND,
3568                         ab8500_charger_irq[i].name, di);
3569
3570                 if (ret != 0) {
3571                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3572                                 , ab8500_charger_irq[i].name, irq, ret);
3573                         goto free_irq;
3574                 }
3575                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3576                         ab8500_charger_irq[i].name, irq, ret);
3577         }
3578
3579         platform_set_drvdata(pdev, di);
3580
3581         mutex_lock(&di->charger_attached_mutex);
3582
3583         ch_stat = ab8500_charger_detect_chargers(di, false);
3584
3585         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3586                 if (is_ab8500(di->parent))
3587                         queue_delayed_work(di->charger_wq,
3588                                            &di->ac_charger_attached_work,
3589                                            HZ);
3590         }
3591         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3592                 if (is_ab8500(di->parent))
3593                         queue_delayed_work(di->charger_wq,
3594                                            &di->usb_charger_attached_work,
3595                                            HZ);
3596         }
3597
3598         mutex_unlock(&di->charger_attached_mutex);
3599
3600         return ret;
3601
3602 free_irq:
3603         usb_unregister_notifier(di->usb_phy, &di->nb);
3604
3605         /* We also have to free all successfully registered irqs */
3606         for (i = i - 1; i >= 0; i--) {
3607                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3608                 free_irq(irq, di);
3609         }
3610 put_usb_phy:
3611         usb_put_phy(di->usb_phy);
3612 free_usb:
3613         if (di->usb_chg.enabled)
3614                 power_supply_unregister(di->usb_chg.psy);
3615 free_ac:
3616         if (di->ac_chg.enabled)
3617                 power_supply_unregister(di->ac_chg.psy);
3618 free_charger_wq:
3619         destroy_workqueue(di->charger_wq);
3620         return ret;
3621 }
3622
3623 static const struct of_device_id ab8500_charger_match[] = {
3624         { .compatible = "stericsson,ab8500-charger", },
3625         { },
3626 };
3627
3628 static struct platform_driver ab8500_charger_driver = {
3629         .probe = ab8500_charger_probe,
3630         .remove = ab8500_charger_remove,
3631         .suspend = ab8500_charger_suspend,
3632         .resume = ab8500_charger_resume,
3633         .driver = {
3634                 .name = "ab8500-charger",
3635                 .of_match_table = ab8500_charger_match,
3636         },
3637 };
3638
3639 static int __init ab8500_charger_init(void)
3640 {
3641         return platform_driver_register(&ab8500_charger_driver);
3642 }
3643
3644 static void __exit ab8500_charger_exit(void)
3645 {
3646         platform_driver_unregister(&ab8500_charger_driver);
3647 }
3648
3649 subsys_initcall_sync(ab8500_charger_init);
3650 module_exit(ab8500_charger_exit);
3651
3652 MODULE_LICENSE("GPL v2");
3653 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3654 MODULE_ALIAS("platform:ab8500-charger");
3655 MODULE_DESCRIPTION("AB8500 charger management driver");