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_CONSTANT_CHARGE_VOLTAGE,
 176         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 177         POWER_SUPPLY_PROP_CURRENT_NOW,
 178 };
 179
 180 /* No battery always shows temperature of -40000 */
 181 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 182 {
 183         struct iio_channel *channel;
 184         int error, temperature;
 185
 186         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 187         error = iio_read_channel_processed(channel, &temperature);
 188         if (error < 0) {
 189                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 190
 191                 return false;
 192         }
 193
 194         return temperature > -20000 && temperature < 60000;
 195 }
 196
 197 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 198 {
 199         struct iio_channel *channel;
 200         int error, value = 0;
 201
 202         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 203         error = iio_read_channel_processed(channel, &value);
 204         if (error < 0) {
 205                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 206
 207                 return 0;
 208         }
 209
 210         return value;
 211 }
 212
 213 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 214 {
 215         struct iio_channel *channel;
 216         int error, value = 0;
 217
 218         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 219         error = iio_read_channel_processed(channel, &value);
 220         if (error < 0) {
 221                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 222
 223                 return 0;
 224         }
 225
 226         return value;
 227 }
 228
 229 static int cpcap_charger_get_property(struct power_supply *psy,
 230                                       enum power_supply_property psp,
 231                                       union power_supply_propval *val)
 232 {
 233         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 234
 235         switch (psp) {
 236         case POWER_SUPPLY_PROP_STATUS:
 237                 val->intval = ddata->status;
 238                 break;
 239         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 240                 val->intval = ddata->voltage;
 241                 break;
 242         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 243                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 244                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 245                                 1000;
 246                 else
 247                         val->intval = 0;
 248                 break;
 249         case POWER_SUPPLY_PROP_CURRENT_NOW:
 250                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 251                         val->intval = cpcap_charger_get_charge_current(ddata) *
 252                                 1000;
 253                 else
 254                         val->intval = 0;
 255                 break;
 256         case POWER_SUPPLY_PROP_ONLINE:
 257                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 258                 break;
 259         default:
 260                 return -EINVAL;
 261         }
 262
 263         return 0;
 264 }
 265
 266 static int cpcap_charger_match_voltage(int voltage)
 267 {
 268         switch (voltage) {
 269         case 0 ... 4100000 - 1: return 3800000;
 270         case 4100000 ... 4120000 - 1: return 4100000;
 271         case 4120000 ... 4150000 - 1: return 4120000;
 272         case 4150000 ... 4170000 - 1: return 4150000;
 273         case 4170000 ... 4200000 - 1: return 4170000;
 274         case 4200000 ... 4230000 - 1: return 4200000;
 275         case 4230000 ... 4250000 - 1: return 4230000;
 276         case 4250000 ... 4270000 - 1: return 4250000;
 277         case 4270000 ... 4300000 - 1: return 4270000;
 278         case 4300000 ... 4330000 - 1: return 4300000;
 279         case 4330000 ... 4350000 - 1: return 4330000;
 280         case 4350000 ... 4380000 - 1: return 4350000;
 281         case 4380000 ... 4400000 - 1: return 4380000;
 282         case 4400000 ... 4420000 - 1: return 4400000;
 283         case 4420000 ... 4440000 - 1: return 4420000;
 284         case 4440000: return 4440000;
 285         default: return 0;
 286         }
 287 }
 288
 289 static int
 290 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
 291 {
 292         union power_supply_propval prop;
 293         struct power_supply *battery;
 294         int voltage = ddata->voltage;
 295         int error;
 296
 297         battery = power_supply_get_by_name("battery");
 298         if (battery) {
 299                 error = power_supply_get_property(battery,
 300                                 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 301                                 &prop);
 302                 if (!error)
 303                         voltage = prop.intval;
 304
 305                 power_supply_put(battery);
 306         }
 307
 308         return voltage;
 309 }
 310
 311 static int cpcap_charger_set_property(struct power_supply *psy,
 312                                       enum power_supply_property psp,
 313                                       const union power_supply_propval *val)
 314 {
 315         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 316         int voltage, batvolt;
 317
 318         switch (psp) {
 319         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 320                 voltage = cpcap_charger_match_voltage(val->intval);
 321                 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
 322                 if (voltage > batvolt)
 323                         voltage = batvolt;
 324                 ddata->voltage = voltage;
 325                 schedule_delayed_work(&ddata->detect_work, 0);
 326                 break;
 327         default:
 328                 return -EINVAL;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
 335                                                enum power_supply_property psp)
 336 {
 337         switch (psp) {
 338         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 339                 return 1;
 340         default:
 341                 return 0;
 342         }
 343 }
 344
 345 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 346                                          bool enabled)
 347 {
 348         if (!ddata->gpio[0])
 349                 return;
 350
 351         gpiod_set_value(ddata->gpio[0], enabled);
 352 }
 353
 354 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 355                                              bool enabled)
 356 {
 357         if (!ddata->gpio[1])
 358                 return;
 359
 360         gpiod_set_value(ddata->gpio[1], enabled);
 361 }
 362
 363 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 364                                    int max_voltage, int charge_current,
 365                                    int trickle_current)
 366 {
 367         bool enable;
 368         int error;
 369
 370         enable = (charge_current || trickle_current);
 371         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 372
 373         if (!enable) {
 374                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 375                                            0x3fff,
 376                                            CPCAP_REG_CRM_FET_OVRD |
 377                                            CPCAP_REG_CRM_FET_CTRL);
 378                 if (error) {
 379                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 380                         goto out_err;
 381                 }
 382
 383                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 384
 385                 return 0;
 386         }
 387
 388         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 389                                    CPCAP_REG_CRM_CHRG_LED_EN |
 390                                    trickle_current |
 391                                    CPCAP_REG_CRM_FET_OVRD |
 392                                    CPCAP_REG_CRM_FET_CTRL |
 393                                    max_voltage |
 394                                    charge_current);
 395         if (error) {
 396                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 397                 goto out_err;
 398         }
 399
 400         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 401
 402         return 0;
 403
 404 out_err:
 405         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 406
 407         return error;
 408 }
 409
 410 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 411 {
 412         int error, value = 0;
 413         struct iio_channel *channel =
 414                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 415
 416         error = iio_read_channel_processed(channel, &value);
 417         if (error >= 0)
 418                 return value > 3900 ? true : false;
 419
 420         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 421
 422         return false;
 423 }
 424
 425 /* VBUS control functions for the USB PHY companion */
 426 static void cpcap_charger_vbus_work(struct work_struct *work)
 427 {
 428         struct cpcap_charger_ddata *ddata;
 429         bool vbus = false;
 430         int error;
 431
 432         ddata = container_of(work, struct cpcap_charger_ddata,
 433                              vbus_work.work);
 434
 435         if (ddata->vbus_enabled) {
 436                 vbus = cpcap_charger_vbus_valid(ddata);
 437                 if (vbus) {
 438                         dev_info(ddata->dev, "VBUS already provided\n");
 439
 440                         return;
 441                 }
 442
 443                 ddata->feeding_vbus = true;
 444                 cpcap_charger_set_cable_path(ddata, false);
 445                 cpcap_charger_set_inductive_path(ddata, false);
 446
 447                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 448                 if (error)
 449                         goto out_err;
 450
 451                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 452                                            CPCAP_BIT_VBUS_SWITCH,
 453                                            CPCAP_BIT_VBUS_SWITCH);
 454                 if (error)
 455                         goto out_err;
 456
 457                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 458                                            CPCAP_REG_CRM_RVRSMODE,
 459                                            CPCAP_REG_CRM_RVRSMODE);
 460                 if (error)
 461                         goto out_err;
 462         } else {
 463                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 464                                            CPCAP_BIT_VBUS_SWITCH, 0);
 465                 if (error)
 466                         goto out_err;
 467
 468                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 469                                            CPCAP_REG_CRM_RVRSMODE, 0);
 470                 if (error)
 471                         goto out_err;
 472
 473                 cpcap_charger_set_cable_path(ddata, true);
 474                 cpcap_charger_set_inductive_path(ddata, true);
 475                 ddata->feeding_vbus = false;
 476         }
 477
 478         return;
 479
 480 out_err:
 481         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 482                 ddata->vbus_enabled ? "enable" : "disable", error);
 483 }
 484
 485 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 486                                   bool enabled)
 487 {
 488         struct cpcap_charger_ddata *ddata =
 489                 container_of(comparator, struct cpcap_charger_ddata,
 490                              comparator);
 491
 492         ddata->vbus_enabled = enabled;
 493         schedule_delayed_work(&ddata->vbus_work, 0);
 494
 495         return 0;
 496 }
 497
 498 /* Charger interrupt handling functions */
 499
 500 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 501                                         struct cpcap_charger_ints_state *s)
 502 {
 503         int val, error;
 504
 505         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 506         if (error)
 507                 return error;
 508
 509         s->chrg_det = val & BIT(13);
 510         s->rvrs_chrg = val & BIT(12);
 511         s->vbusov = val & BIT(11);
 512
 513         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 514         if (error)
 515                 return error;
 516
 517         s->chrg_se1b = val & BIT(13);
 518         s->rvrs_mode = val & BIT(6);
 519         s->chrgcurr2 = val & BIT(5);
 520         s->chrgcurr1 = val & BIT(4);
 521         s->vbusvld = val & BIT(3);
 522
 523         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 524         if (error)
 525                 return error;
 526
 527         s->battdetb = val & BIT(6);
 528
 529         return 0;
 530 }
 531
 532 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 533                                        int state)
 534 {
 535         const char *status;
 536
 537         if (state > CPCAP_CHARGER_DONE) {
 538                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 539
 540                 return;
 541         }
 542
 543         ddata->state = state;
 544
 545         switch (state) {
 546         case CPCAP_CHARGER_DISCONNECTED:
 547                 status = "DISCONNECTED";
 548                 break;
 549         case CPCAP_CHARGER_DETECTING:
 550                 status = "DETECTING";
 551                 break;
 552         case CPCAP_CHARGER_CHARGING:
 553                 status = "CHARGING";
 554                 break;
 555         case CPCAP_CHARGER_DONE:
 556                 status = "DONE";
 557                 break;
 558         default:
 559                 return;
 560         }
 561
 562         dev_dbg(ddata->dev, "state: %s\n", status);
 563 }
 564
 565 static int cpcap_charger_voltage_to_regval(int voltage)
 566 {
 567         int offset;
 568
 569         switch (voltage) {
 570         case 0 ... 4100000 - 1:
 571                 return 0;
 572         case 4100000 ... 4200000 - 1:
 573                 offset = 1;
 574                 break;
 575         case 4200000 ... 4300000 - 1:
 576                 offset = 0;
 577                 break;
 578         case 4300000 ... 4380000 - 1:
 579                 offset = -1;
 580                 break;
 581         case 4380000 ... 4440000:
 582                 offset = -2;
 583                 break;
 584         default:
 585                 return 0;
 586         }
 587
 588         return ((voltage - 4100000) / 20000) + offset;
 589 }
 590
 591 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 592                                      int state, unsigned long delay)
 593 {
 594         int error;
 595
 596         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 597         if (error)
 598                 return;
 599
 600         cpcap_charger_update_state(ddata, state);
 601         power_supply_changed(ddata->usb);
 602         schedule_delayed_work(&ddata->detect_work, delay);
 603 }
 604
 605 static void cpcap_usb_detect(struct work_struct *work)
 606 {
 607         struct cpcap_charger_ddata *ddata;
 608         struct cpcap_charger_ints_state s;
 609         int error;
 610
 611         ddata = container_of(work, struct cpcap_charger_ddata,
 612                              detect_work.work);
 613
 614         error = cpcap_charger_get_ints_state(ddata, &s);
 615         if (error)
 616                 return;
 617
 618         /* Just init the state if a charger is connected with no chrg_det set */
 619         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 620                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING);
 621
 622                 return;
 623         }
 624
 625         /*
 626          * If battery voltage is higher than charge voltage, it may have been
 627          * charged to 4.35V by Android. Try again in 10 minutes.
 628          */
 629         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 630                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 631                                          HZ * 60 * 10);
 632
 633                 return;
 634         }
 635
 636         /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
 637         usleep_range(80000, 120000);
 638
 639         /* Throttle chrgcurr2 interrupt for charger done and retry */
 640         switch (ddata->state) {
 641         case CPCAP_CHARGER_CHARGING:
 642                 if (s.chrgcurr2)
 643                         break;
 644                 if (s.chrgcurr1 && s.vbusvld) {
 645                         cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE,
 646                                                  HZ * 5);
 647                         return;
 648                 }
 649                 break;
 650         case CPCAP_CHARGER_DONE:
 651                 if (!s.chrgcurr2)
 652                         break;
 653                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 654                                          HZ * 5);
 655                 return;
 656         default:
 657                 break;
 658         }
 659
 660         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 661             s.chrgcurr1) {
 662                 int max_current;
 663                 int vchrg;
 664
 665                 if (cpcap_charger_battery_found(ddata))
 666                         max_current = CPCAP_REG_CRM_ICHRG_1A596;
 667                 else
 668                         max_current = CPCAP_REG_CRM_ICHRG_0A532;
 669
 670                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 671                 error = cpcap_charger_set_state(ddata,
 672                                                 CPCAP_REG_CRM_VCHRG(vchrg),
 673                                                 max_current, 0);
 674                 if (error)
 675                         goto out_err;
 676                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING);
 677         } else {
 678                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 679                 if (error)
 680                         goto out_err;
 681                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED);
 682         }
 683
 684         power_supply_changed(ddata->usb);
 685         return;
 686
 687 out_err:
 688         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 689 }
 690
 691 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 692 {
 693         struct cpcap_charger_ddata *ddata = data;
 694
 695         if (!atomic_read(&ddata->active))
 696                 return IRQ_NONE;
 697
 698         schedule_delayed_work(&ddata->detect_work, 0);
 699
 700         return IRQ_HANDLED;
 701 }
 702
 703 static int cpcap_usb_init_irq(struct platform_device *pdev,
 704                               struct cpcap_charger_ddata *ddata,
 705                               const char *name)
 706 {
 707         struct cpcap_interrupt_desc *d;
 708         int irq, error;
 709
 710         irq = platform_get_irq_byname(pdev, name);
 711         if (irq < 0)
 712                 return -ENODEV;
 713
 714         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 715                                           cpcap_charger_irq_thread,
 716                                           IRQF_SHARED | IRQF_ONESHOT,
 717                                           name, ddata);
 718         if (error) {
 719                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 720                         name, error);
 721
 722                 return error;
 723         }
 724
 725         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 726         if (!d)
 727                 return -ENOMEM;
 728
 729         d->name = name;
 730         d->irq = irq;
 731         list_add(&d->node, &ddata->irq_list);
 732
 733         return 0;
 734 }
 735
 736 static const char * const cpcap_charger_irqs[] = {
 737         /* REG_INT_0 */
 738         "chrg_det", "rvrs_chrg",
 739
 740         /* REG_INT1 */
 741         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 742
 743         /* REG_INT_3 */
 744         "battdetb",
 745 };
 746
 747 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 748                                      struct cpcap_charger_ddata *ddata)
 749 {
 750         int i, error;
 751
 752         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 753                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 754                 if (error)
 755                         return error;
 756         }
 757
 758         return 0;
 759 }
 760
 761 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 762 {
 763         int i;
 764
 765         for (i = 0; i < 2; i++) {
 766                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 767                                                       i, GPIOD_OUT_HIGH);
 768                 if (IS_ERR(ddata->gpio[i])) {
 769                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 770                                  i, PTR_ERR(ddata->gpio[i]));
 771                         ddata->gpio[i] = NULL;
 772                 }
 773         }
 774 }
 775
 776 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 777 {
 778         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 779                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 780         };
 781         int error, i;
 782
 783         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 784                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 785                                                           names[i]);
 786                 if (IS_ERR(ddata->channels[i])) {
 787                         error = PTR_ERR(ddata->channels[i]);
 788                         goto out_err;
 789                 }
 790
 791                 if (!ddata->channels[i]->indio_dev) {
 792                         error = -ENXIO;
 793                         goto out_err;
 794                 }
 795         }
 796
 797         return 0;
 798
 799 out_err:
 800         if (error != -EPROBE_DEFER)
 801                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 802                         error);
 803
 804         return error;
 805 }
 806
 807 static const struct power_supply_desc cpcap_charger_usb_desc = {
 808         .name           = "usb",
 809         .type           = POWER_SUPPLY_TYPE_USB,
 810         .properties     = cpcap_charger_props,
 811         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 812         .get_property   = cpcap_charger_get_property,
 813         .set_property   = cpcap_charger_set_property,
 814         .property_is_writeable = cpcap_charger_property_is_writeable,
 815 };
 816
 817 #ifdef CONFIG_OF
 818 static const struct of_device_id cpcap_charger_id_table[] = {
 819         {
 820                 .compatible = "motorola,mapphone-cpcap-charger",
 821         },
 822         {},
 823 };
 824 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 825 #endif
 826
 827 static int cpcap_charger_probe(struct platform_device *pdev)
 828 {
 829         struct cpcap_charger_ddata *ddata;
 830         const struct of_device_id *of_id;
 831         struct power_supply_config psy_cfg = {};
 832         int error;
 833
 834         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 835                                 &pdev->dev);
 836         if (!of_id)
 837                 return -EINVAL;
 838
 839         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 840         if (!ddata)
 841                 return -ENOMEM;
 842
 843         ddata->dev = &pdev->dev;
 844         ddata->voltage = 4200000;
 845
 846         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 847         if (!ddata->reg)
 848                 return -ENODEV;
 849
 850         INIT_LIST_HEAD(&ddata->irq_list);
 851         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 852         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 853         platform_set_drvdata(pdev, ddata);
 854
 855         error = cpcap_charger_init_iio(ddata);
 856         if (error)
 857                 return error;
 858
 859         atomic_set(&ddata->active, 1);
 860
 861         psy_cfg.of_node = pdev->dev.of_node;
 862         psy_cfg.drv_data = ddata;
 863
 864         ddata->usb = devm_power_supply_register(ddata->dev,
 865                                                 &cpcap_charger_usb_desc,
 866                                                 &psy_cfg);
 867         if (IS_ERR(ddata->usb)) {
 868                 error = PTR_ERR(ddata->usb);
 869                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 870                         error);
 871
 872                 return error;
 873         }
 874
 875         error = cpcap_usb_init_interrupts(pdev, ddata);
 876         if (error)
 877                 return error;
 878
 879         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 880         error = omap_usb2_set_comparator(&ddata->comparator);
 881         if (error == -ENODEV) {
 882                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 883                 return -EPROBE_DEFER;
 884         }
 885
 886         cpcap_charger_init_optional_gpios(ddata);
 887
 888         schedule_delayed_work(&ddata->detect_work, 0);
 889
 890         return 0;
 891 }
 892
 893 static int cpcap_charger_remove(struct platform_device *pdev)
 894 {
 895         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 896         int error;
 897
 898         atomic_set(&ddata->active, 0);
 899         error = omap_usb2_set_comparator(NULL);
 900         if (error)
 901                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 902                          error);
 903
 904         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 905         if (error)
 906                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 907                          error);
 908         cancel_delayed_work_sync(&ddata->vbus_work);
 909         cancel_delayed_work_sync(&ddata->detect_work);
 910
 911         return 0;
 912 }
 913
 914 static struct platform_driver cpcap_charger_driver = {
 915         .probe = cpcap_charger_probe,
 916         .driver = {
 917                 .name   = "cpcap-charger",
 918                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 919         },
 920         .remove = cpcap_charger_remove,
 921 };
 922 module_platform_driver(cpcap_charger_driver);
 923
 924 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 925 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 926 MODULE_LICENSE("GPL v2");
 927 MODULE_ALIAS("platform:cpcap-charger");