drivers/power/supply/cpcap-charger.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Motorola CPCAP PMIC battery charger driver
   4  *
   5  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
   6  *
   7  * Rewritten for Linux power framework with some parts based on
   8  * on earlier driver found in the Motorola Linux kernel:
   9  *
  10  * Copyright (C) 2009-2010 Motorola, Inc.
  11  */
  12
  13 #include <linux/atomic.h>
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/notifier.h>
  20 #include <linux/of.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/regmap.h>
  25
  26 #include <linux/gpio/consumer.h>
  27 #include <linux/usb/phy_companion.h>
  28 #include <linux/phy/omap_usb.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/iio/consumer.h>
  31 #include <linux/mfd/motorola-cpcap.h>
  32
  33 /*
  34  * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
  35  * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
  36  * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
  37  * and values for CPCAP are different, but some of the internal components seem
  38  * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
  39  * bits that seem to describe the CRM register.
  40  */
  41 #define CPCAP_REG_CRM_UNUSED_641_15     BIT(15) /* 641 = register number */
  42 #define CPCAP_REG_CRM_UNUSED_641_14     BIT(14) /* 641 = register number */
  43 #define CPCAP_REG_CRM_CHRG_LED_EN       BIT(13) /* Charger LED */
  44 #define CPCAP_REG_CRM_RVRSMODE          BIT(12) /* USB VBUS output enable */
  45 #define CPCAP_REG_CRM_ICHRG_TR1         BIT(11) /* Trickle charge current */
  46 #define CPCAP_REG_CRM_ICHRG_TR0         BIT(10)
  47 #define CPCAP_REG_CRM_FET_OVRD          BIT(9)  /* 0 = hardware, 1 = FET_CTRL */
  48 #define CPCAP_REG_CRM_FET_CTRL          BIT(8)  /* BPFET 1 if FET_OVRD set */
  49 #define CPCAP_REG_CRM_VCHRG3            BIT(7)  /* Charge voltage bits */
  50 #define CPCAP_REG_CRM_VCHRG2            BIT(6)
  51 #define CPCAP_REG_CRM_VCHRG1            BIT(5)
  52 #define CPCAP_REG_CRM_VCHRG0            BIT(4)
  53 #define CPCAP_REG_CRM_ICHRG3            BIT(3)  /* Charge current bits */
  54 #define CPCAP_REG_CRM_ICHRG2            BIT(2)
  55 #define CPCAP_REG_CRM_ICHRG1            BIT(1)
  56 #define CPCAP_REG_CRM_ICHRG0            BIT(0)
  57
  58 /* CPCAP_REG_CRM trickle charge voltages */
  59 #define CPCAP_REG_CRM_TR(val)           (((val) & 0x3) << 10)
  60 #define CPCAP_REG_CRM_TR_0A00           CPCAP_REG_CRM_TR(0x0)
  61 #define CPCAP_REG_CRM_TR_0A24           CPCAP_REG_CRM_TR(0x1)
  62 #define CPCAP_REG_CRM_TR_0A48           CPCAP_REG_CRM_TR(0x2)
  63 #define CPCAP_REG_CRM_TR_0A72           CPCAP_REG_CRM_TR(0x4)
  64
  65 /*
  66  * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
  67  * Note that these register bits don't match MC13783UG.pdf VCHRG
  68  * register bits.
  69  */
  70 #define CPCAP_REG_CRM_VCHRG(val)        (((val) & 0xf) << 4)
  71 #define CPCAP_REG_CRM_VCHRG_3V80        CPCAP_REG_CRM_VCHRG(0x0)
  72 #define CPCAP_REG_CRM_VCHRG_4V10        CPCAP_REG_CRM_VCHRG(0x1)
  73 #define CPCAP_REG_CRM_VCHRG_4V12        CPCAP_REG_CRM_VCHRG(0x2)
  74 #define CPCAP_REG_CRM_VCHRG_4V15        CPCAP_REG_CRM_VCHRG(0x3)
  75 #define CPCAP_REG_CRM_VCHRG_4V17        CPCAP_REG_CRM_VCHRG(0x4)
  76 #define CPCAP_REG_CRM_VCHRG_4V20        CPCAP_REG_CRM_VCHRG(0x5)
  77 #define CPCAP_REG_CRM_VCHRG_4V23        CPCAP_REG_CRM_VCHRG(0x6)
  78 #define CPCAP_REG_CRM_VCHRG_4V25        CPCAP_REG_CRM_VCHRG(0x7)
  79 #define CPCAP_REG_CRM_VCHRG_4V27        CPCAP_REG_CRM_VCHRG(0x8)
  80 #define CPCAP_REG_CRM_VCHRG_4V30        CPCAP_REG_CRM_VCHRG(0x9)
  81 #define CPCAP_REG_CRM_VCHRG_4V33        CPCAP_REG_CRM_VCHRG(0xa)
  82 #define CPCAP_REG_CRM_VCHRG_4V35        CPCAP_REG_CRM_VCHRG(0xb)
  83 #define CPCAP_REG_CRM_VCHRG_4V38        CPCAP_REG_CRM_VCHRG(0xc)
  84 #define CPCAP_REG_CRM_VCHRG_4V40        CPCAP_REG_CRM_VCHRG(0xd)
  85 #define CPCAP_REG_CRM_VCHRG_4V42        CPCAP_REG_CRM_VCHRG(0xe)
  86 #define CPCAP_REG_CRM_VCHRG_4V44        CPCAP_REG_CRM_VCHRG(0xf)
  87
  88 /*
  89  * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
  90  * values in "Table 8-3. Charge Path Regulator Current Limit
  91  * Characteristics" for the nominal values.
  92  */
  93 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  94 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  95 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  96 #define CPCAP_REG_CRM_ICHRG_0A177       CPCAP_REG_CRM_ICHRG(0x2)
  97 #define CPCAP_REG_CRM_ICHRG_0A266       CPCAP_REG_CRM_ICHRG(0x3)
  98 #define CPCAP_REG_CRM_ICHRG_0A355       CPCAP_REG_CRM_ICHRG(0x4)
  99 #define CPCAP_REG_CRM_ICHRG_0A443       CPCAP_REG_CRM_ICHRG(0x5)
 100 #define CPCAP_REG_CRM_ICHRG_0A532       CPCAP_REG_CRM_ICHRG(0x6)
 101 #define CPCAP_REG_CRM_ICHRG_0A621       CPCAP_REG_CRM_ICHRG(0x7)
 102 #define CPCAP_REG_CRM_ICHRG_0A709       CPCAP_REG_CRM_ICHRG(0x8)
 103 #define CPCAP_REG_CRM_ICHRG_0A798       CPCAP_REG_CRM_ICHRG(0x9)
 104 #define CPCAP_REG_CRM_ICHRG_0A886       CPCAP_REG_CRM_ICHRG(0xa)
 105 #define CPCAP_REG_CRM_ICHRG_0A975       CPCAP_REG_CRM_ICHRG(0xb)
 106 #define CPCAP_REG_CRM_ICHRG_1A064       CPCAP_REG_CRM_ICHRG(0xc)
 107 #define CPCAP_REG_CRM_ICHRG_1A152       CPCAP_REG_CRM_ICHRG(0xd)
 108 #define CPCAP_REG_CRM_ICHRG_1A596       CPCAP_REG_CRM_ICHRG(0xe)
 109 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 110
 111 /* CPCAP_REG_VUSBC register bits needed for VBUS */
 112 #define CPCAP_BIT_VBUS_SWITCH           BIT(0)  /* VBUS boost to 5V */
 113
 114 enum {
 115         CPCAP_CHARGER_IIO_BATTDET,
 116         CPCAP_CHARGER_IIO_VOLTAGE,
 117         CPCAP_CHARGER_IIO_VBUS,
 118         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 119         CPCAP_CHARGER_IIO_BATT_CURRENT,
 120         CPCAP_CHARGER_IIO_NR,
 121 };
 122
 123 enum {
 124         CPCAP_CHARGER_DISCONNECTED,
 125         CPCAP_CHARGER_DETECTING,
 126         CPCAP_CHARGER_CHARGING,
 127         CPCAP_CHARGER_DONE,
 128 };
 129
 130 struct cpcap_charger_ddata {
 131         struct device *dev;
 132         struct regmap *reg;
 133         struct list_head irq_list;
 134         struct delayed_work detect_work;
 135         struct delayed_work vbus_work;
 136         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 137
 138         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 139
 140         struct power_supply *usb;
 141
 142         struct phy_companion comparator;        /* For USB VBUS */
 143         unsigned int vbus_enabled:1;
 144         unsigned int feeding_vbus:1;
 145         atomic_t active;
 146
 147         int status;
 148         int state;
 149         int voltage;
 150 };
 151
 152 struct cpcap_interrupt_desc {
 153         int irq;
 154         struct list_head node;
 155         const char *name;
 156 };
 157
 158 struct cpcap_charger_ints_state {
 159         bool chrg_det;
 160         bool rvrs_chrg;
 161         bool vbusov;
 162
 163         bool chrg_se1b;
 164         bool rvrs_mode;
 165         bool chrgcurr2;
 166         bool chrgcurr1;
 167         bool vbusvld;
 168
 169         bool battdetb;
 170 };
 171
 172 static enum power_supply_property cpcap_charger_props[] = {
 173         POWER_SUPPLY_PROP_STATUS,
 174         POWER_SUPPLY_PROP_ONLINE,
 175         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 176         POWER_SUPPLY_PROP_CURRENT_NOW,
 177 };
 178
 179 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 180 {
 181         struct iio_channel *channel;
 182         int error, value;
 183
 184         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 185         error = iio_read_channel_raw(channel, &value);
 186         if (error < 0) {
 187                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 188
 189                 return false;
 190         }
 191
 192         return value == 1;
 193 }
 194
 195 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 196 {
 197         struct iio_channel *channel;
 198         int error, value = 0;
 199
 200         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 201         error = iio_read_channel_processed(channel, &value);
 202         if (error < 0) {
 203                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 204
 205                 return 0;
 206         }
 207
 208         return value;
 209 }
 210
 211 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 212 {
 213         struct iio_channel *channel;
 214         int error, value = 0;
 215
 216         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 217         error = iio_read_channel_processed(channel, &value);
 218         if (error < 0) {
 219                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 220
 221                 return 0;
 222         }
 223
 224         return value;
 225 }
 226
 227 static int cpcap_charger_get_property(struct power_supply *psy,
 228                                       enum power_supply_property psp,
 229                                       union power_supply_propval *val)
 230 {
 231         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 232
 233         switch (psp) {
 234         case POWER_SUPPLY_PROP_STATUS:
 235                 val->intval = ddata->status;
 236                 break;
 237         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 238                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 239                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 240                                 1000;
 241                 else
 242                         val->intval = 0;
 243                 break;
 244         case POWER_SUPPLY_PROP_CURRENT_NOW:
 245                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 246                         val->intval = cpcap_charger_get_charge_current(ddata) *
 247                                 1000;
 248                 else
 249                         val->intval = 0;
 250                 break;
 251         case POWER_SUPPLY_PROP_ONLINE:
 252                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 262                                          bool enabled)
 263 {
 264         if (!ddata->gpio[0])
 265                 return;
 266
 267         gpiod_set_value(ddata->gpio[0], enabled);
 268 }
 269
 270 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 271                                              bool enabled)
 272 {
 273         if (!ddata->gpio[1])
 274                 return;
 275
 276         gpiod_set_value(ddata->gpio[1], enabled);
 277 }
 278
 279 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 280                                    int max_voltage, int charge_current,
 281                                    int trickle_current)
 282 {
 283         bool enable;
 284         int error;
 285
 286         enable = (charge_current || trickle_current);
 287         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 288
 289         if (!enable) {
 290                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 291                                            0x3fff,
 292                                            CPCAP_REG_CRM_FET_OVRD |
 293                                            CPCAP_REG_CRM_FET_CTRL);
 294                 if (error) {
 295                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 296                         goto out_err;
 297                 }
 298
 299                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 300
 301                 return 0;
 302         }
 303
 304         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 305                                    CPCAP_REG_CRM_CHRG_LED_EN |
 306                                    trickle_current |
 307                                    CPCAP_REG_CRM_FET_OVRD |
 308                                    CPCAP_REG_CRM_FET_CTRL |
 309                                    max_voltage |
 310                                    charge_current);
 311         if (error) {
 312                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 313                 goto out_err;
 314         }
 315
 316         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 317
 318         return 0;
 319
 320 out_err:
 321         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 322
 323         return error;
 324 }
 325
 326 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 327 {
 328         int error, value = 0;
 329         struct iio_channel *channel =
 330                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 331
 332         error = iio_read_channel_processed(channel, &value);
 333         if (error >= 0)
 334                 return value > 3900 ? true : false;
 335
 336         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 337
 338         return false;
 339 }
 340
 341 /* VBUS control functions for the USB PHY companion */
 342 static void cpcap_charger_vbus_work(struct work_struct *work)
 343 {
 344         struct cpcap_charger_ddata *ddata;
 345         bool vbus = false;
 346         int error;
 347
 348         ddata = container_of(work, struct cpcap_charger_ddata,
 349                              vbus_work.work);
 350
 351         if (ddata->vbus_enabled) {
 352                 vbus = cpcap_charger_vbus_valid(ddata);
 353                 if (vbus) {
 354                         dev_info(ddata->dev, "VBUS already provided\n");
 355
 356                         return;
 357                 }
 358
 359                 ddata->feeding_vbus = true;
 360                 cpcap_charger_set_cable_path(ddata, false);
 361                 cpcap_charger_set_inductive_path(ddata, false);
 362
 363                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 364                 if (error)
 365                         goto out_err;
 366
 367                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 368                                            CPCAP_BIT_VBUS_SWITCH,
 369                                            CPCAP_BIT_VBUS_SWITCH);
 370                 if (error)
 371                         goto out_err;
 372
 373                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 374                                            CPCAP_REG_CRM_RVRSMODE,
 375                                            CPCAP_REG_CRM_RVRSMODE);
 376                 if (error)
 377                         goto out_err;
 378         } else {
 379                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 380                                            CPCAP_BIT_VBUS_SWITCH, 0);
 381                 if (error)
 382                         goto out_err;
 383
 384                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 385                                            CPCAP_REG_CRM_RVRSMODE, 0);
 386                 if (error)
 387                         goto out_err;
 388
 389                 cpcap_charger_set_cable_path(ddata, true);
 390                 cpcap_charger_set_inductive_path(ddata, true);
 391                 ddata->feeding_vbus = false;
 392         }
 393
 394         return;
 395
 396 out_err:
 397         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 398                 ddata->vbus_enabled ? "enable" : "disable", error);
 399 }
 400
 401 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 402                                   bool enabled)
 403 {
 404         struct cpcap_charger_ddata *ddata =
 405                 container_of(comparator, struct cpcap_charger_ddata,
 406                              comparator);
 407
 408         ddata->vbus_enabled = enabled;
 409         schedule_delayed_work(&ddata->vbus_work, 0);
 410
 411         return 0;
 412 }
 413
 414 /* Charger interrupt handling functions */
 415
 416 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 417                                         struct cpcap_charger_ints_state *s)
 418 {
 419         int val, error;
 420
 421         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 422         if (error)
 423                 return error;
 424
 425         s->chrg_det = val & BIT(13);
 426         s->rvrs_chrg = val & BIT(12);
 427         s->vbusov = val & BIT(11);
 428
 429         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 430         if (error)
 431                 return error;
 432
 433         s->chrg_se1b = val & BIT(13);
 434         s->rvrs_mode = val & BIT(6);
 435         s->chrgcurr2 = val & BIT(5);
 436         s->chrgcurr1 = val & BIT(4);
 437         s->vbusvld = val & BIT(3);
 438
 439         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 440         if (error)
 441                 return error;
 442
 443         s->battdetb = val & BIT(6);
 444
 445         return 0;
 446 }
 447
 448 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 449                                        int state)
 450 {
 451         const char *status;
 452
 453         if (state > CPCAP_CHARGER_DONE) {
 454                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 455
 456                 return;
 457         }
 458
 459         ddata->state = state;
 460
 461         switch (state) {
 462         case CPCAP_CHARGER_DISCONNECTED:
 463                 status = "DISCONNECTED";
 464                 break;
 465         case CPCAP_CHARGER_DETECTING:
 466                 status = "DETECTING";
 467                 break;
 468         case CPCAP_CHARGER_CHARGING:
 469                 status = "CHARGING";
 470                 break;
 471         case CPCAP_CHARGER_DONE:
 472                 status = "DONE";
 473                 break;
 474         default:
 475                 return;
 476         }
 477
 478         dev_dbg(ddata->dev, "state: %s\n", status);
 479 }
 480
 481 int cpcap_charger_voltage_to_regval(int voltage)
 482 {
 483         int offset;
 484
 485         switch (voltage) {
 486         case 0 ... 4100000 - 1:
 487                 return 0;
 488         case 4100000 ... 4200000 - 1:
 489                 offset = 1;
 490                 break;
 491         case 4200000 ... 4300000 - 1:
 492                 offset = 0;
 493                 break;
 494         case 4300000 ... 4380000 - 1:
 495                 offset = -1;
 496                 break;
 497         case 4380000 ... 4440000:
 498                 offset = -2;
 499                 break;
 500         default:
 501                 return 0;
 502         }
 503
 504         return ((voltage - 4100000) / 20000) + offset;
 505 }
 506
 507 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 508                                      int state, unsigned long delay)
 509 {
 510         int error;
 511
 512         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 513         if (error)
 514                 return;
 515
 516         cpcap_charger_update_state(ddata, state);
 517         power_supply_changed(ddata->usb);
 518         schedule_delayed_work(&ddata->detect_work, delay);
 519 }
 520
 521 static void cpcap_usb_detect(struct work_struct *work)
 522 {
 523         struct cpcap_charger_ddata *ddata;
 524         struct cpcap_charger_ints_state s;
 525         int error;
 526
 527         ddata = container_of(work, struct cpcap_charger_ddata,
 528                              detect_work.work);
 529
 530         error = cpcap_charger_get_ints_state(ddata, &s);
 531         if (error)
 532                 return;
 533
 534         /* Just init the state if a charger is connected with no chrg_det set */
 535         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 536                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING);
 537
 538                 return;
 539         }
 540
 541         /*
 542          * If battery voltage is higher than charge voltage, it may have been
 543          * charged to 4.35V by Android. Try again in 10 minutes.
 544          */
 545         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 546                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 547                                          HZ * 60 * 10);
 548
 549                 return;
 550         }
 551
 552         /* Throttle chrgcurr2 interrupt for charger done and retry */
 553         switch (ddata->state) {
 554         case CPCAP_CHARGER_CHARGING:
 555                 if (s.chrgcurr2)
 556                         break;
 557                 if (s.chrgcurr1 && s.vbusvld) {
 558                         cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE,
 559                                                  HZ * 5);
 560                         return;
 561                 }
 562                 break;
 563         case CPCAP_CHARGER_DONE:
 564                 if (!s.chrgcurr2)
 565                         break;
 566                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 567                                          HZ * 5);
 568                 return;
 569         default:
 570                 break;
 571         }
 572
 573         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 574             s.chrgcurr1) {
 575                 int max_current;
 576                 int vchrg;
 577
 578                 if (cpcap_charger_battery_found(ddata))
 579                         max_current = CPCAP_REG_CRM_ICHRG_1A596;
 580                 else
 581                         max_current = CPCAP_REG_CRM_ICHRG_0A532;
 582
 583                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 584                 error = cpcap_charger_set_state(ddata,
 585                                                 CPCAP_REG_CRM_VCHRG(vchrg),
 586                                                 max_current, 0);
 587                 if (error)
 588                         goto out_err;
 589                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING);
 590         } else {
 591                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 592                 if (error)
 593                         goto out_err;
 594                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED);
 595         }
 596
 597         power_supply_changed(ddata->usb);
 598         return;
 599
 600 out_err:
 601         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 602 }
 603
 604 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 605 {
 606         struct cpcap_charger_ddata *ddata = data;
 607
 608         if (!atomic_read(&ddata->active))
 609                 return IRQ_NONE;
 610
 611         schedule_delayed_work(&ddata->detect_work, 0);
 612
 613         return IRQ_HANDLED;
 614 }
 615
 616 static int cpcap_usb_init_irq(struct platform_device *pdev,
 617                               struct cpcap_charger_ddata *ddata,
 618                               const char *name)
 619 {
 620         struct cpcap_interrupt_desc *d;
 621         int irq, error;
 622
 623         irq = platform_get_irq_byname(pdev, name);
 624         if (irq < 0)
 625                 return -ENODEV;
 626
 627         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 628                                           cpcap_charger_irq_thread,
 629                                           IRQF_SHARED,
 630                                           name, ddata);
 631         if (error) {
 632                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 633                         name, error);
 634
 635                 return error;
 636         }
 637
 638         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 639         if (!d)
 640                 return -ENOMEM;
 641
 642         d->name = name;
 643         d->irq = irq;
 644         list_add(&d->node, &ddata->irq_list);
 645
 646         return 0;
 647 }
 648
 649 static const char * const cpcap_charger_irqs[] = {
 650         /* REG_INT_0 */
 651         "chrg_det", "rvrs_chrg",
 652
 653         /* REG_INT1 */
 654         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 655
 656         /* REG_INT_3 */
 657         "battdetb",
 658 };
 659
 660 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 661                                      struct cpcap_charger_ddata *ddata)
 662 {
 663         int i, error;
 664
 665         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 666                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 667                 if (error)
 668                         return error;
 669         }
 670
 671         return 0;
 672 }
 673
 674 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 675 {
 676         int i;
 677
 678         for (i = 0; i < 2; i++) {
 679                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 680                                                       i, GPIOD_OUT_HIGH);
 681                 if (IS_ERR(ddata->gpio[i])) {
 682                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 683                                  i, PTR_ERR(ddata->gpio[i]));
 684                         ddata->gpio[i] = NULL;
 685                 }
 686         }
 687 }
 688
 689 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 690 {
 691         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 692                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 693         };
 694         int error, i;
 695
 696         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 697                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 698                                                           names[i]);
 699                 if (IS_ERR(ddata->channels[i])) {
 700                         error = PTR_ERR(ddata->channels[i]);
 701                         goto out_err;
 702                 }
 703
 704                 if (!ddata->channels[i]->indio_dev) {
 705                         error = -ENXIO;
 706                         goto out_err;
 707                 }
 708         }
 709
 710         return 0;
 711
 712 out_err:
 713         if (error != -EPROBE_DEFER)
 714                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 715                         error);
 716
 717         return error;
 718 }
 719
 720 static const struct power_supply_desc cpcap_charger_usb_desc = {
 721         .name           = "usb",
 722         .type           = POWER_SUPPLY_TYPE_USB,
 723         .properties     = cpcap_charger_props,
 724         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 725         .get_property   = cpcap_charger_get_property,
 726 };
 727
 728 #ifdef CONFIG_OF
 729 static const struct of_device_id cpcap_charger_id_table[] = {
 730         {
 731                 .compatible = "motorola,mapphone-cpcap-charger",
 732         },
 733         {},
 734 };
 735 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 736 #endif
 737
 738 static int cpcap_charger_probe(struct platform_device *pdev)
 739 {
 740         struct cpcap_charger_ddata *ddata;
 741         const struct of_device_id *of_id;
 742         struct power_supply_config psy_cfg = {};
 743         int error;
 744
 745         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 746                                 &pdev->dev);
 747         if (!of_id)
 748                 return -EINVAL;
 749
 750         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 751         if (!ddata)
 752                 return -ENOMEM;
 753
 754         ddata->dev = &pdev->dev;
 755         ddata->voltage = 4200000;
 756
 757         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 758         if (!ddata->reg)
 759                 return -ENODEV;
 760
 761         INIT_LIST_HEAD(&ddata->irq_list);
 762         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 763         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 764         platform_set_drvdata(pdev, ddata);
 765
 766         error = cpcap_charger_init_iio(ddata);
 767         if (error)
 768                 return error;
 769
 770         atomic_set(&ddata->active, 1);
 771
 772         psy_cfg.of_node = pdev->dev.of_node;
 773         psy_cfg.drv_data = ddata;
 774
 775         ddata->usb = devm_power_supply_register(ddata->dev,
 776                                                 &cpcap_charger_usb_desc,
 777                                                 &psy_cfg);
 778         if (IS_ERR(ddata->usb)) {
 779                 error = PTR_ERR(ddata->usb);
 780                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 781                         error);
 782
 783                 return error;
 784         }
 785
 786         error = cpcap_usb_init_interrupts(pdev, ddata);
 787         if (error)
 788                 return error;
 789
 790         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 791         error = omap_usb2_set_comparator(&ddata->comparator);
 792         if (error == -ENODEV) {
 793                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 794                 return -EPROBE_DEFER;
 795         }
 796
 797         cpcap_charger_init_optional_gpios(ddata);
 798
 799         schedule_delayed_work(&ddata->detect_work, 0);
 800
 801         return 0;
 802 }
 803
 804 static int cpcap_charger_remove(struct platform_device *pdev)
 805 {
 806         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 807         int error;
 808
 809         atomic_set(&ddata->active, 0);
 810         error = omap_usb2_set_comparator(NULL);
 811         if (error)
 812                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 813                          error);
 814
 815         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 816         if (error)
 817                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 818                          error);
 819         cancel_delayed_work_sync(&ddata->vbus_work);
 820         cancel_delayed_work_sync(&ddata->detect_work);
 821
 822         return 0;
 823 }
 824
 825 static struct platform_driver cpcap_charger_driver = {
 826         .probe = cpcap_charger_probe,
 827         .driver = {
 828                 .name   = "cpcap-charger",
 829                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 830         },
 831         .remove = cpcap_charger_remove,
 832 };
 833 module_platform_driver(cpcap_charger_driver);
 834
 835 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 836 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 837 MODULE_LICENSE("GPL v2");
 838 MODULE_ALIAS("platform:cpcap-charger");