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  * 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/mod_devicetable.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/regmap.h>
  24
  25 #include <linux/gpio/consumer.h>
  26 #include <linux/usb/phy_companion.h>
  27 #include <linux/phy/omap_usb.h>
  28 #include <linux/usb/otg.h>
  29 #include <linux/iio/consumer.h>
  30 #include <linux/mfd/motorola-cpcap.h>
  31
  32 /*
  33  * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
  34  * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
  35  * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
  36  * and values for CPCAP are different, but some of the internal components seem
  37  * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
  38  * bits that seem to describe the CRM register.
  39  */
  40 #define CPCAP_REG_CRM_UNUSED_641_15     BIT(15) /* 641 = register number */
  41 #define CPCAP_REG_CRM_UNUSED_641_14     BIT(14) /* 641 = register number */
  42 #define CPCAP_REG_CRM_CHRG_LED_EN       BIT(13) /* Charger LED */
  43 #define CPCAP_REG_CRM_RVRSMODE          BIT(12) /* USB VBUS output enable */
  44 #define CPCAP_REG_CRM_ICHRG_TR1         BIT(11) /* Trickle charge current */
  45 #define CPCAP_REG_CRM_ICHRG_TR0         BIT(10)
  46 #define CPCAP_REG_CRM_FET_OVRD          BIT(9)  /* 0 = hardware, 1 = FET_CTRL */
  47 #define CPCAP_REG_CRM_FET_CTRL          BIT(8)  /* BPFET 1 if FET_OVRD set */
  48 #define CPCAP_REG_CRM_VCHRG3            BIT(7)  /* Charge voltage bits */
  49 #define CPCAP_REG_CRM_VCHRG2            BIT(6)
  50 #define CPCAP_REG_CRM_VCHRG1            BIT(5)
  51 #define CPCAP_REG_CRM_VCHRG0            BIT(4)
  52 #define CPCAP_REG_CRM_ICHRG3            BIT(3)  /* Charge current bits */
  53 #define CPCAP_REG_CRM_ICHRG2            BIT(2)
  54 #define CPCAP_REG_CRM_ICHRG1            BIT(1)
  55 #define CPCAP_REG_CRM_ICHRG0            BIT(0)
  56
  57 /* CPCAP_REG_CRM trickle charge voltages */
  58 #define CPCAP_REG_CRM_TR(val)           (((val) & 0x3) << 10)
  59 #define CPCAP_REG_CRM_TR_0A00           CPCAP_REG_CRM_TR(0x0)
  60 #define CPCAP_REG_CRM_TR_0A24           CPCAP_REG_CRM_TR(0x1)
  61 #define CPCAP_REG_CRM_TR_0A48           CPCAP_REG_CRM_TR(0x2)
  62 #define CPCAP_REG_CRM_TR_0A72           CPCAP_REG_CRM_TR(0x4)
  63
  64 /*
  65  * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
  66  * Note that these register bits don't match MC13783UG.pdf VCHRG
  67  * register bits.
  68  */
  69 #define CPCAP_REG_CRM_VCHRG(val)        (((val) & 0xf) << 4)
  70 #define CPCAP_REG_CRM_VCHRG_3V80        CPCAP_REG_CRM_VCHRG(0x0)
  71 #define CPCAP_REG_CRM_VCHRG_4V10        CPCAP_REG_CRM_VCHRG(0x1)
  72 #define CPCAP_REG_CRM_VCHRG_4V12        CPCAP_REG_CRM_VCHRG(0x2)
  73 #define CPCAP_REG_CRM_VCHRG_4V15        CPCAP_REG_CRM_VCHRG(0x3)
  74 #define CPCAP_REG_CRM_VCHRG_4V17        CPCAP_REG_CRM_VCHRG(0x4)
  75 #define CPCAP_REG_CRM_VCHRG_4V20        CPCAP_REG_CRM_VCHRG(0x5)
  76 #define CPCAP_REG_CRM_VCHRG_4V23        CPCAP_REG_CRM_VCHRG(0x6)
  77 #define CPCAP_REG_CRM_VCHRG_4V25        CPCAP_REG_CRM_VCHRG(0x7)
  78 #define CPCAP_REG_CRM_VCHRG_4V27        CPCAP_REG_CRM_VCHRG(0x8)
  79 #define CPCAP_REG_CRM_VCHRG_4V30        CPCAP_REG_CRM_VCHRG(0x9)
  80 #define CPCAP_REG_CRM_VCHRG_4V33        CPCAP_REG_CRM_VCHRG(0xa)
  81 #define CPCAP_REG_CRM_VCHRG_4V35        CPCAP_REG_CRM_VCHRG(0xb)
  82 #define CPCAP_REG_CRM_VCHRG_4V38        CPCAP_REG_CRM_VCHRG(0xc)
  83 #define CPCAP_REG_CRM_VCHRG_4V40        CPCAP_REG_CRM_VCHRG(0xd)
  84 #define CPCAP_REG_CRM_VCHRG_4V42        CPCAP_REG_CRM_VCHRG(0xe)
  85 #define CPCAP_REG_CRM_VCHRG_4V44        CPCAP_REG_CRM_VCHRG(0xf)
  86
  87 /*
  88  * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
  89  * values in "Table 8-3. Charge Path Regulator Current Limit
  90  * Characteristics" for the nominal values.
  91  *
  92  * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
  93  */
  94 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  95 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  96 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  97 #define CPCAP_REG_CRM_ICHRG_0A177       CPCAP_REG_CRM_ICHRG(0x2)
  98 #define CPCAP_REG_CRM_ICHRG_0A266       CPCAP_REG_CRM_ICHRG(0x3)
  99 #define CPCAP_REG_CRM_ICHRG_0A355       CPCAP_REG_CRM_ICHRG(0x4)
 100 #define CPCAP_REG_CRM_ICHRG_0A443       CPCAP_REG_CRM_ICHRG(0x5)
 101 #define CPCAP_REG_CRM_ICHRG_0A532       CPCAP_REG_CRM_ICHRG(0x6)
 102 #define CPCAP_REG_CRM_ICHRG_0A621       CPCAP_REG_CRM_ICHRG(0x7)
 103 #define CPCAP_REG_CRM_ICHRG_0A709       CPCAP_REG_CRM_ICHRG(0x8)
 104 #define CPCAP_REG_CRM_ICHRG_0A798       CPCAP_REG_CRM_ICHRG(0x9)
 105 #define CPCAP_REG_CRM_ICHRG_0A886       CPCAP_REG_CRM_ICHRG(0xa)
 106 #define CPCAP_REG_CRM_ICHRG_0A975       CPCAP_REG_CRM_ICHRG(0xb)
 107 #define CPCAP_REG_CRM_ICHRG_1A064       CPCAP_REG_CRM_ICHRG(0xc)
 108 #define CPCAP_REG_CRM_ICHRG_1A152       CPCAP_REG_CRM_ICHRG(0xd)
 109 #define CPCAP_REG_CRM_ICHRG_1A596       CPCAP_REG_CRM_ICHRG(0xe)
 110 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 111
 112 /* CPCAP_REG_VUSBC register bits needed for VBUS */
 113 #define CPCAP_BIT_VBUS_SWITCH           BIT(0)  /* VBUS boost to 5V */
 114
 115 enum {
 116         CPCAP_CHARGER_IIO_BATTDET,
 117         CPCAP_CHARGER_IIO_VOLTAGE,
 118         CPCAP_CHARGER_IIO_VBUS,
 119         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 120         CPCAP_CHARGER_IIO_BATT_CURRENT,
 121         CPCAP_CHARGER_IIO_NR,
 122 };
 123
 124 struct cpcap_charger_ddata {
 125         struct device *dev;
 126         struct regmap *reg;
 127         struct list_head irq_list;
 128         struct delayed_work detect_work;
 129         struct delayed_work vbus_work;
 130         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 131
 132         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 133
 134         struct power_supply *usb;
 135
 136         struct phy_companion comparator;        /* For USB VBUS */
 137         unsigned int vbus_enabled:1;
 138         unsigned int feeding_vbus:1;
 139         atomic_t active;
 140
 141         int status;
 142         int voltage;
 143         int limit_current;
 144 };
 145
 146 struct cpcap_interrupt_desc {
 147         int irq;
 148         struct list_head node;
 149         const char *name;
 150 };
 151
 152 struct cpcap_charger_ints_state {
 153         bool chrg_det;
 154         bool rvrs_chrg;
 155         bool vbusov;
 156
 157         bool chrg_se1b;
 158         bool rvrs_mode;
 159         bool chrgcurr2;
 160         bool chrgcurr1;
 161         bool vbusvld;
 162
 163         bool battdetb;
 164 };
 165
 166 static enum power_supply_property cpcap_charger_props[] = {
 167         POWER_SUPPLY_PROP_STATUS,
 168         POWER_SUPPLY_PROP_ONLINE,
 169         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 170         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 171         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 172         POWER_SUPPLY_PROP_CURRENT_NOW,
 173 };
 174
 175 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 176 {
 177         struct iio_channel *channel;
 178         int error, value = 0;
 179
 180         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 181         error = iio_read_channel_processed(channel, &value);
 182         if (error < 0) {
 183                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 184
 185                 return 0;
 186         }
 187
 188         return value;
 189 }
 190
 191 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 192 {
 193         struct iio_channel *channel;
 194         int error, value = 0;
 195
 196         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 197         error = iio_read_channel_processed(channel, &value);
 198         if (error < 0) {
 199                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 200
 201                 return 0;
 202         }
 203
 204         return value;
 205 }
 206
 207 static int cpcap_charger_get_property(struct power_supply *psy,
 208                                       enum power_supply_property psp,
 209                                       union power_supply_propval *val)
 210 {
 211         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 212
 213         switch (psp) {
 214         case POWER_SUPPLY_PROP_STATUS:
 215                 val->intval = ddata->status;
 216                 break;
 217         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 218                 val->intval = ddata->limit_current;
 219                 break;
 220         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 221                 val->intval = ddata->voltage;
 222                 break;
 223         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 224                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 225                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 226                                 1000;
 227                 else
 228                         val->intval = 0;
 229                 break;
 230         case POWER_SUPPLY_PROP_CURRENT_NOW:
 231                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 232                         val->intval = cpcap_charger_get_charge_current(ddata) *
 233                                 1000;
 234                 else
 235                         val->intval = 0;
 236                 break;
 237         case POWER_SUPPLY_PROP_ONLINE:
 238                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 239                 break;
 240         default:
 241                 return -EINVAL;
 242         }
 243
 244         return 0;
 245 }
 246
 247 static int cpcap_charger_match_voltage(int voltage)
 248 {
 249         switch (voltage) {
 250         case 0 ... 4100000 - 1: return 3800000;
 251         case 4100000 ... 4120000 - 1: return 4100000;
 252         case 4120000 ... 4150000 - 1: return 4120000;
 253         case 4150000 ... 4170000 - 1: return 4150000;
 254         case 4170000 ... 4200000 - 1: return 4170000;
 255         case 4200000 ... 4230000 - 1: return 4200000;
 256         case 4230000 ... 4250000 - 1: return 4230000;
 257         case 4250000 ... 4270000 - 1: return 4250000;
 258         case 4270000 ... 4300000 - 1: return 4270000;
 259         case 4300000 ... 4330000 - 1: return 4300000;
 260         case 4330000 ... 4350000 - 1: return 4330000;
 261         case 4350000 ... 4380000 - 1: return 4350000;
 262         case 4380000 ... 4400000 - 1: return 4380000;
 263         case 4400000 ... 4420000 - 1: return 4400000;
 264         case 4420000 ... 4440000 - 1: return 4420000;
 265         case 4440000: return 4440000;
 266         default: return 0;
 267         }
 268 }
 269
 270 static int
 271 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
 272 {
 273         union power_supply_propval prop;
 274         struct power_supply *battery;
 275         int voltage = ddata->voltage;
 276         int error;
 277
 278         battery = power_supply_get_by_name("battery");
 279         if (battery) {
 280                 error = power_supply_get_property(battery,
 281                                 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 282                                 &prop);
 283                 if (!error)
 284                         voltage = prop.intval;
 285
 286                 power_supply_put(battery);
 287         }
 288
 289         return voltage;
 290 }
 291
 292 static int cpcap_charger_current_to_regval(int microamp)
 293 {
 294         int miliamp = microamp / 1000;
 295         int res;
 296
 297         if (miliamp < 0)
 298                 return -EINVAL;
 299         if (miliamp < 70)
 300                 return CPCAP_REG_CRM_ICHRG(0x0);
 301         if (miliamp < 177)
 302                 return CPCAP_REG_CRM_ICHRG(0x1);
 303         if (miliamp >= 1596)
 304                 return CPCAP_REG_CRM_ICHRG(0xe);
 305
 306         res = microamp / 88666;
 307         if (res > 0xd)
 308                 res = 0xd;
 309         return CPCAP_REG_CRM_ICHRG(res);
 310 }
 311
 312 static int cpcap_charger_set_property(struct power_supply *psy,
 313                                       enum power_supply_property psp,
 314                                       const union power_supply_propval *val)
 315 {
 316         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 317         int voltage, batvolt;
 318
 319         switch (psp) {
 320         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 321                 if (cpcap_charger_current_to_regval(val->intval) < 0)
 322                         return -EINVAL;
 323                 ddata->limit_current = val->intval;
 324                 schedule_delayed_work(&ddata->detect_work, 0);
 325                 break;
 326         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 327                 voltage = cpcap_charger_match_voltage(val->intval);
 328                 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
 329                 if (voltage > batvolt)
 330                         voltage = batvolt;
 331                 ddata->voltage = voltage;
 332                 schedule_delayed_work(&ddata->detect_work, 0);
 333                 break;
 334         default:
 335                 return -EINVAL;
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
 342                                                enum power_supply_property psp)
 343 {
 344         switch (psp) {
 345         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 346         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 347                 return 1;
 348         default:
 349                 return 0;
 350         }
 351 }
 352
 353 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 354                                          bool enabled)
 355 {
 356         if (!ddata->gpio[0])
 357                 return;
 358
 359         gpiod_set_value(ddata->gpio[0], enabled);
 360 }
 361
 362 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 363                                              bool enabled)
 364 {
 365         if (!ddata->gpio[1])
 366                 return;
 367
 368         gpiod_set_value(ddata->gpio[1], enabled);
 369 }
 370
 371 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 372                                        int state)
 373 {
 374         const char *status;
 375
 376         if (state > POWER_SUPPLY_STATUS_FULL) {
 377                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 378
 379                 return;
 380         }
 381
 382         ddata->status = state;
 383
 384         switch (state) {
 385         case POWER_SUPPLY_STATUS_DISCHARGING:
 386                 status = "DISCONNECTED";
 387                 break;
 388         case POWER_SUPPLY_STATUS_NOT_CHARGING:
 389                 status = "DETECTING";
 390                 break;
 391         case POWER_SUPPLY_STATUS_CHARGING:
 392                 status = "CHARGING";
 393                 break;
 394         case POWER_SUPPLY_STATUS_FULL:
 395                 status = "DONE";
 396                 break;
 397         default:
 398                 return;
 399         }
 400
 401         dev_dbg(ddata->dev, "state: %s\n", status);
 402 }
 403
 404 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
 405 {
 406         int error;
 407
 408         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 409                                    CPCAP_REG_CRM_FET_OVRD |
 410                                    CPCAP_REG_CRM_FET_CTRL);
 411         if (error)
 412                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 413
 414         return error;
 415 }
 416
 417 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
 418                                 int max_voltage, int charge_current,
 419                                 int trickle_current)
 420 {
 421         int error;
 422
 423         if (!max_voltage || !charge_current)
 424                 return -EINVAL;
 425
 426         dev_dbg(ddata->dev, "enable: %i %i %i\n",
 427                 max_voltage, charge_current, trickle_current);
 428
 429         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 430                                    CPCAP_REG_CRM_CHRG_LED_EN |
 431                                    trickle_current |
 432                                    CPCAP_REG_CRM_FET_OVRD |
 433                                    CPCAP_REG_CRM_FET_CTRL |
 434                                    max_voltage |
 435                                    charge_current);
 436         if (error)
 437                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 438
 439         return error;
 440 }
 441
 442 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 443 {
 444         int error, value = 0;
 445         struct iio_channel *channel =
 446                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 447
 448         error = iio_read_channel_processed(channel, &value);
 449         if (error >= 0)
 450                 return value > 3900;
 451
 452         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 453
 454         return false;
 455 }
 456
 457 /* VBUS control functions for the USB PHY companion */
 458 static void cpcap_charger_vbus_work(struct work_struct *work)
 459 {
 460         struct cpcap_charger_ddata *ddata;
 461         bool vbus = false;
 462         int error;
 463
 464         ddata = container_of(work, struct cpcap_charger_ddata,
 465                              vbus_work.work);
 466
 467         if (ddata->vbus_enabled) {
 468                 vbus = cpcap_charger_vbus_valid(ddata);
 469                 if (vbus) {
 470                         dev_dbg(ddata->dev, "VBUS already provided\n");
 471
 472                         return;
 473                 }
 474
 475                 ddata->feeding_vbus = true;
 476                 cpcap_charger_set_cable_path(ddata, false);
 477                 cpcap_charger_set_inductive_path(ddata, false);
 478
 479                 error = cpcap_charger_disable(ddata);
 480                 if (error)
 481                         goto out_err;
 482
 483                 cpcap_charger_update_state(ddata,
 484                                            POWER_SUPPLY_STATUS_DISCHARGING);
 485
 486                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 487                                            CPCAP_BIT_VBUS_SWITCH,
 488                                            CPCAP_BIT_VBUS_SWITCH);
 489                 if (error)
 490                         goto out_err;
 491
 492                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 493                                            CPCAP_REG_CRM_RVRSMODE,
 494                                            CPCAP_REG_CRM_RVRSMODE);
 495                 if (error)
 496                         goto out_err;
 497         } else {
 498                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 499                                            CPCAP_BIT_VBUS_SWITCH, 0);
 500                 if (error)
 501                         goto out_err;
 502
 503                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 504                                            CPCAP_REG_CRM_RVRSMODE, 0);
 505                 if (error)
 506                         goto out_err;
 507
 508                 cpcap_charger_set_cable_path(ddata, true);
 509                 cpcap_charger_set_inductive_path(ddata, true);
 510                 ddata->feeding_vbus = false;
 511         }
 512
 513         return;
 514
 515 out_err:
 516         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 517         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 518                 ddata->vbus_enabled ? "enable" : "disable", error);
 519 }
 520
 521 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 522                                   bool enabled)
 523 {
 524         struct cpcap_charger_ddata *ddata =
 525                 container_of(comparator, struct cpcap_charger_ddata,
 526                              comparator);
 527
 528         ddata->vbus_enabled = enabled;
 529         schedule_delayed_work(&ddata->vbus_work, 0);
 530
 531         return 0;
 532 }
 533
 534 /* Charger interrupt handling functions */
 535
 536 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 537                                         struct cpcap_charger_ints_state *s)
 538 {
 539         int val, error;
 540
 541         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 542         if (error)
 543                 return error;
 544
 545         s->chrg_det = val & BIT(13);
 546         s->rvrs_chrg = val & BIT(12);
 547         s->vbusov = val & BIT(11);
 548
 549         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 550         if (error)
 551                 return error;
 552
 553         s->chrg_se1b = val & BIT(13);
 554         s->rvrs_mode = val & BIT(6);
 555         s->chrgcurr2 = val & BIT(5);
 556         s->chrgcurr1 = val & BIT(4);
 557         s->vbusvld = val & BIT(3);
 558
 559         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 560         if (error)
 561                 return error;
 562
 563         s->battdetb = val & BIT(6);
 564
 565         return 0;
 566 }
 567
 568 static int cpcap_charger_voltage_to_regval(int voltage)
 569 {
 570         int offset;
 571
 572         switch (voltage) {
 573         case 0 ... 4100000 - 1:
 574                 return 0;
 575         case 4100000 ... 4200000 - 1:
 576                 offset = 1;
 577                 break;
 578         case 4200000 ... 4300000 - 1:
 579                 offset = 0;
 580                 break;
 581         case 4300000 ... 4380000 - 1:
 582                 offset = -1;
 583                 break;
 584         case 4380000 ... 4440000:
 585                 offset = -2;
 586                 break;
 587         default:
 588                 return 0;
 589         }
 590
 591         return ((voltage - 4100000) / 20000) + offset;
 592 }
 593
 594 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 595                                      int state, unsigned long delay)
 596 {
 597         int error;
 598
 599         /* Update battery state before disconnecting the charger */
 600         switch (state) {
 601         case POWER_SUPPLY_STATUS_DISCHARGING:
 602         case POWER_SUPPLY_STATUS_FULL:
 603                 power_supply_changed(ddata->usb);
 604                 break;
 605         default:
 606                 break;
 607         }
 608
 609         error = cpcap_charger_disable(ddata);
 610         if (error) {
 611                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 612                 return;
 613         }
 614
 615         cpcap_charger_update_state(ddata, state);
 616         power_supply_changed(ddata->usb);
 617         schedule_delayed_work(&ddata->detect_work, delay);
 618 }
 619
 620 static void cpcap_usb_detect(struct work_struct *work)
 621 {
 622         struct cpcap_charger_ddata *ddata;
 623         struct cpcap_charger_ints_state s;
 624         int error, new_state;
 625
 626         ddata = container_of(work, struct cpcap_charger_ddata,
 627                              detect_work.work);
 628
 629         error = cpcap_charger_get_ints_state(ddata, &s);
 630         if (error)
 631                 return;
 632
 633         /* Just init the state if a charger is connected with no chrg_det set */
 634         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 635                 cpcap_charger_update_state(ddata,
 636                                            POWER_SUPPLY_STATUS_NOT_CHARGING);
 637
 638                 return;
 639         }
 640
 641         /*
 642          * If battery voltage is higher than charge voltage, it may have been
 643          * charged to 4.35V by Android. Try again in 10 minutes.
 644          */
 645         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 646                 cpcap_charger_disconnect(ddata,
 647                                          POWER_SUPPLY_STATUS_NOT_CHARGING,
 648                                          HZ * 60 * 10);
 649
 650                 return;
 651         }
 652
 653         /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
 654         usleep_range(80000, 120000);
 655
 656         /* Throttle chrgcurr2 interrupt for charger done and retry */
 657         switch (ddata->status) {
 658         case POWER_SUPPLY_STATUS_CHARGING:
 659                 if (s.chrgcurr2)
 660                         break;
 661                 new_state = POWER_SUPPLY_STATUS_FULL;
 662
 663                 if (s.chrgcurr1 && s.vbusvld) {
 664                         cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 665                         return;
 666                 }
 667                 break;
 668         case POWER_SUPPLY_STATUS_FULL:
 669                 if (!s.chrgcurr2)
 670                         break;
 671                 if (s.vbusvld)
 672                         new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
 673                 else
 674                         new_state = POWER_SUPPLY_STATUS_DISCHARGING;
 675
 676                 cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 677
 678                 return;
 679         default:
 680                 break;
 681         }
 682
 683         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 684             s.chrgcurr1) {
 685                 int max_current;
 686                 int vchrg, ichrg;
 687                 union power_supply_propval val;
 688                 struct power_supply *battery;
 689
 690                 battery = power_supply_get_by_name("battery");
 691                 if (IS_ERR_OR_NULL(battery)) {
 692                         dev_err(ddata->dev, "battery power_supply not available %li\n",
 693                                         PTR_ERR(battery));
 694                         return;
 695                 }
 696
 697                 error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
 698                 power_supply_put(battery);
 699                 if (error)
 700                         goto out_err;
 701
 702                 if (val.intval) {
 703                         max_current = 1596000;
 704                 } else {
 705                         dev_info(ddata->dev, "battery not inserted, charging disabled\n");
 706                         max_current = 0;
 707                 }
 708
 709                 if (max_current > ddata->limit_current)
 710                         max_current = ddata->limit_current;
 711
 712                 ichrg = cpcap_charger_current_to_regval(max_current);
 713                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 714                 error = cpcap_charger_enable(ddata,
 715                                              CPCAP_REG_CRM_VCHRG(vchrg),
 716                                              ichrg, 0);
 717                 if (error)
 718                         goto out_err;
 719                 cpcap_charger_update_state(ddata,
 720                                            POWER_SUPPLY_STATUS_CHARGING);
 721         } else {
 722                 error = cpcap_charger_disable(ddata);
 723                 if (error)
 724                         goto out_err;
 725                 cpcap_charger_update_state(ddata,
 726                                            POWER_SUPPLY_STATUS_DISCHARGING);
 727         }
 728
 729         power_supply_changed(ddata->usb);
 730         return;
 731
 732 out_err:
 733         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 734         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 735 }
 736
 737 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 738 {
 739         struct cpcap_charger_ddata *ddata = data;
 740
 741         if (!atomic_read(&ddata->active))
 742                 return IRQ_NONE;
 743
 744         schedule_delayed_work(&ddata->detect_work, 0);
 745
 746         return IRQ_HANDLED;
 747 }
 748
 749 static int cpcap_usb_init_irq(struct platform_device *pdev,
 750                               struct cpcap_charger_ddata *ddata,
 751                               const char *name)
 752 {
 753         struct cpcap_interrupt_desc *d;
 754         int irq, error;
 755
 756         irq = platform_get_irq_byname(pdev, name);
 757         if (irq < 0)
 758                 return -ENODEV;
 759
 760         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 761                                           cpcap_charger_irq_thread,
 762                                           IRQF_SHARED | IRQF_ONESHOT,
 763                                           name, ddata);
 764         if (error) {
 765                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 766                         name, error);
 767
 768                 return error;
 769         }
 770
 771         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 772         if (!d)
 773                 return -ENOMEM;
 774
 775         d->name = name;
 776         d->irq = irq;
 777         list_add(&d->node, &ddata->irq_list);
 778
 779         return 0;
 780 }
 781
 782 static const char * const cpcap_charger_irqs[] = {
 783         /* REG_INT_0 */
 784         "chrg_det", "rvrs_chrg",
 785
 786         /* REG_INT1 */
 787         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 788
 789         /* REG_INT_3 */
 790         "battdetb",
 791 };
 792
 793 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 794                                      struct cpcap_charger_ddata *ddata)
 795 {
 796         int i, error;
 797
 798         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 799                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 800                 if (error)
 801                         return error;
 802         }
 803
 804         return 0;
 805 }
 806
 807 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 808 {
 809         int i;
 810
 811         for (i = 0; i < 2; i++) {
 812                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 813                                                       i, GPIOD_OUT_HIGH);
 814                 if (IS_ERR(ddata->gpio[i])) {
 815                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 816                                  i, PTR_ERR(ddata->gpio[i]));
 817                         ddata->gpio[i] = NULL;
 818                 }
 819         }
 820 }
 821
 822 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 823 {
 824         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 825                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 826         };
 827         int error, i;
 828
 829         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 830                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 831                                                           names[i]);
 832                 if (IS_ERR(ddata->channels[i])) {
 833                         error = PTR_ERR(ddata->channels[i]);
 834                         goto out_err;
 835                 }
 836
 837                 if (!ddata->channels[i]->indio_dev) {
 838                         error = -ENXIO;
 839                         goto out_err;
 840                 }
 841         }
 842
 843         return 0;
 844
 845 out_err:
 846         if (error != -EPROBE_DEFER)
 847                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 848                         error);
 849
 850         return error;
 851 }
 852
 853 static char *cpcap_charger_supplied_to[] = {
 854         "battery",
 855 };
 856
 857 static const struct power_supply_desc cpcap_charger_usb_desc = {
 858         .name           = "usb",
 859         .type           = POWER_SUPPLY_TYPE_USB,
 860         .properties     = cpcap_charger_props,
 861         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 862         .get_property   = cpcap_charger_get_property,
 863         .set_property   = cpcap_charger_set_property,
 864         .property_is_writeable = cpcap_charger_property_is_writeable,
 865 };
 866
 867 static const struct of_device_id cpcap_charger_id_table[] = {
 868         {
 869                 .compatible = "motorola,mapphone-cpcap-charger",
 870         },
 871         {},
 872 };
 873 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 874
 875 static int cpcap_charger_probe(struct platform_device *pdev)
 876 {
 877         struct cpcap_charger_ddata *ddata;
 878         struct power_supply_config psy_cfg = {};
 879         int error;
 880
 881         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 882         if (!ddata)
 883                 return -ENOMEM;
 884
 885         ddata->dev = &pdev->dev;
 886         ddata->voltage = 4200000;
 887         ddata->limit_current = 532000;
 888
 889         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 890         if (!ddata->reg)
 891                 return -ENODEV;
 892
 893         INIT_LIST_HEAD(&ddata->irq_list);
 894         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 895         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 896         platform_set_drvdata(pdev, ddata);
 897
 898         error = cpcap_charger_init_iio(ddata);
 899         if (error)
 900                 return error;
 901
 902         atomic_set(&ddata->active, 1);
 903
 904         psy_cfg.of_node = pdev->dev.of_node;
 905         psy_cfg.drv_data = ddata;
 906         psy_cfg.supplied_to = cpcap_charger_supplied_to;
 907         psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
 908
 909         ddata->usb = devm_power_supply_register(ddata->dev,
 910                                                 &cpcap_charger_usb_desc,
 911                                                 &psy_cfg);
 912         if (IS_ERR(ddata->usb)) {
 913                 error = PTR_ERR(ddata->usb);
 914                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 915                         error);
 916
 917                 return error;
 918         }
 919
 920         error = cpcap_usb_init_interrupts(pdev, ddata);
 921         if (error)
 922                 return error;
 923
 924         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 925         error = omap_usb2_set_comparator(&ddata->comparator);
 926         if (error == -ENODEV) {
 927                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 928                 return -EPROBE_DEFER;
 929         }
 930
 931         cpcap_charger_init_optional_gpios(ddata);
 932
 933         schedule_delayed_work(&ddata->detect_work, 0);
 934
 935         return 0;
 936 }
 937
 938 static void cpcap_charger_shutdown(struct platform_device *pdev)
 939 {
 940         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 941         int error;
 942
 943         atomic_set(&ddata->active, 0);
 944         error = omap_usb2_set_comparator(NULL);
 945         if (error)
 946                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 947                          error);
 948
 949         error = cpcap_charger_disable(ddata);
 950         if (error) {
 951                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 952                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 953                          error);
 954         }
 955         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
 956         cancel_delayed_work_sync(&ddata->vbus_work);
 957         cancel_delayed_work_sync(&ddata->detect_work);
 958 }
 959
 960 static void cpcap_charger_remove(struct platform_device *pdev)
 961 {
 962         cpcap_charger_shutdown(pdev);
 963 }
 964
 965 static struct platform_driver cpcap_charger_driver = {
 966         .probe = cpcap_charger_probe,
 967         .driver = {
 968                 .name   = "cpcap-charger",
 969                 .of_match_table = cpcap_charger_id_table,
 970         },
 971         .shutdown = cpcap_charger_shutdown,
 972         .remove_new = cpcap_charger_remove,
 973 };
 974 module_platform_driver(cpcap_charger_driver);
 975
 976 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 977 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 978 MODULE_LICENSE("GPL v2");
 979 MODULE_ALIAS("platform:cpcap-charger");