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/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  * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
  94  */
  95 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  96 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  97 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  98 #define CPCAP_REG_CRM_ICHRG_0A177       CPCAP_REG_CRM_ICHRG(0x2)
  99 #define CPCAP_REG_CRM_ICHRG_0A266       CPCAP_REG_CRM_ICHRG(0x3)
 100 #define CPCAP_REG_CRM_ICHRG_0A355       CPCAP_REG_CRM_ICHRG(0x4)
 101 #define CPCAP_REG_CRM_ICHRG_0A443       CPCAP_REG_CRM_ICHRG(0x5)
 102 #define CPCAP_REG_CRM_ICHRG_0A532       CPCAP_REG_CRM_ICHRG(0x6)
 103 #define CPCAP_REG_CRM_ICHRG_0A621       CPCAP_REG_CRM_ICHRG(0x7)
 104 #define CPCAP_REG_CRM_ICHRG_0A709       CPCAP_REG_CRM_ICHRG(0x8)
 105 #define CPCAP_REG_CRM_ICHRG_0A798       CPCAP_REG_CRM_ICHRG(0x9)
 106 #define CPCAP_REG_CRM_ICHRG_0A886       CPCAP_REG_CRM_ICHRG(0xa)
 107 #define CPCAP_REG_CRM_ICHRG_0A975       CPCAP_REG_CRM_ICHRG(0xb)
 108 #define CPCAP_REG_CRM_ICHRG_1A064       CPCAP_REG_CRM_ICHRG(0xc)
 109 #define CPCAP_REG_CRM_ICHRG_1A152       CPCAP_REG_CRM_ICHRG(0xd)
 110 #define CPCAP_REG_CRM_ICHRG_1A596       CPCAP_REG_CRM_ICHRG(0xe)
 111 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 112
 113 /* CPCAP_REG_VUSBC register bits needed for VBUS */
 114 #define CPCAP_BIT_VBUS_SWITCH           BIT(0)  /* VBUS boost to 5V */
 115
 116 enum {
 117         CPCAP_CHARGER_IIO_BATTDET,
 118         CPCAP_CHARGER_IIO_VOLTAGE,
 119         CPCAP_CHARGER_IIO_VBUS,
 120         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 121         CPCAP_CHARGER_IIO_BATT_CURRENT,
 122         CPCAP_CHARGER_IIO_NR,
 123 };
 124
 125 struct cpcap_charger_ddata {
 126         struct device *dev;
 127         struct regmap *reg;
 128         struct list_head irq_list;
 129         struct delayed_work detect_work;
 130         struct delayed_work vbus_work;
 131         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 132
 133         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 134
 135         struct power_supply *usb;
 136
 137         struct phy_companion comparator;        /* For USB VBUS */
 138         unsigned int vbus_enabled:1;
 139         unsigned int feeding_vbus:1;
 140         atomic_t active;
 141
 142         int status;
 143         int voltage;
 144         int limit_current;
 145 };
 146
 147 struct cpcap_interrupt_desc {
 148         int irq;
 149         struct list_head node;
 150         const char *name;
 151 };
 152
 153 struct cpcap_charger_ints_state {
 154         bool chrg_det;
 155         bool rvrs_chrg;
 156         bool vbusov;
 157
 158         bool chrg_se1b;
 159         bool rvrs_mode;
 160         bool chrgcurr2;
 161         bool chrgcurr1;
 162         bool vbusvld;
 163
 164         bool battdetb;
 165 };
 166
 167 static enum power_supply_property cpcap_charger_props[] = {
 168         POWER_SUPPLY_PROP_STATUS,
 169         POWER_SUPPLY_PROP_ONLINE,
 170         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 171         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 172         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 173         POWER_SUPPLY_PROP_CURRENT_NOW,
 174 };
 175
 176 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 177 {
 178         struct iio_channel *channel;
 179         int error, value = 0;
 180
 181         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 182         error = iio_read_channel_processed(channel, &value);
 183         if (error < 0) {
 184                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 185
 186                 return 0;
 187         }
 188
 189         return value;
 190 }
 191
 192 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 193 {
 194         struct iio_channel *channel;
 195         int error, value = 0;
 196
 197         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 198         error = iio_read_channel_processed(channel, &value);
 199         if (error < 0) {
 200                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 201
 202                 return 0;
 203         }
 204
 205         return value;
 206 }
 207
 208 static int cpcap_charger_get_property(struct power_supply *psy,
 209                                       enum power_supply_property psp,
 210                                       union power_supply_propval *val)
 211 {
 212         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 213
 214         switch (psp) {
 215         case POWER_SUPPLY_PROP_STATUS:
 216                 val->intval = ddata->status;
 217                 break;
 218         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 219                 val->intval = ddata->limit_current;
 220                 break;
 221         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 222                 val->intval = ddata->voltage;
 223                 break;
 224         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 225                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 226                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 227                                 1000;
 228                 else
 229                         val->intval = 0;
 230                 break;
 231         case POWER_SUPPLY_PROP_CURRENT_NOW:
 232                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 233                         val->intval = cpcap_charger_get_charge_current(ddata) *
 234                                 1000;
 235                 else
 236                         val->intval = 0;
 237                 break;
 238         case POWER_SUPPLY_PROP_ONLINE:
 239                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 240                 break;
 241         default:
 242                 return -EINVAL;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static int cpcap_charger_match_voltage(int voltage)
 249 {
 250         switch (voltage) {
 251         case 0 ... 4100000 - 1: return 3800000;
 252         case 4100000 ... 4120000 - 1: return 4100000;
 253         case 4120000 ... 4150000 - 1: return 4120000;
 254         case 4150000 ... 4170000 - 1: return 4150000;
 255         case 4170000 ... 4200000 - 1: return 4170000;
 256         case 4200000 ... 4230000 - 1: return 4200000;
 257         case 4230000 ... 4250000 - 1: return 4230000;
 258         case 4250000 ... 4270000 - 1: return 4250000;
 259         case 4270000 ... 4300000 - 1: return 4270000;
 260         case 4300000 ... 4330000 - 1: return 4300000;
 261         case 4330000 ... 4350000 - 1: return 4330000;
 262         case 4350000 ... 4380000 - 1: return 4350000;
 263         case 4380000 ... 4400000 - 1: return 4380000;
 264         case 4400000 ... 4420000 - 1: return 4400000;
 265         case 4420000 ... 4440000 - 1: return 4420000;
 266         case 4440000: return 4440000;
 267         default: return 0;
 268         }
 269 }
 270
 271 static int
 272 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
 273 {
 274         union power_supply_propval prop;
 275         struct power_supply *battery;
 276         int voltage = ddata->voltage;
 277         int error;
 278
 279         battery = power_supply_get_by_name("battery");
 280         if (battery) {
 281                 error = power_supply_get_property(battery,
 282                                 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 283                                 &prop);
 284                 if (!error)
 285                         voltage = prop.intval;
 286
 287                 power_supply_put(battery);
 288         }
 289
 290         return voltage;
 291 }
 292
 293 static int cpcap_charger_current_to_regval(int microamp)
 294 {
 295         int miliamp = microamp / 1000;
 296         int res;
 297
 298         if (miliamp < 0)
 299                 return -EINVAL;
 300         if (miliamp < 70)
 301                 return CPCAP_REG_CRM_ICHRG(0x0);
 302         if (miliamp < 177)
 303                 return CPCAP_REG_CRM_ICHRG(0x1);
 304         if (miliamp >= 1596)
 305                 return CPCAP_REG_CRM_ICHRG(0xe);
 306
 307         res = microamp / 88666;
 308         if (res > 0xd)
 309                 res = 0xd;
 310         return CPCAP_REG_CRM_ICHRG(res);
 311 }
 312
 313 static int cpcap_charger_set_property(struct power_supply *psy,
 314                                       enum power_supply_property psp,
 315                                       const union power_supply_propval *val)
 316 {
 317         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 318         int voltage, batvolt;
 319
 320         switch (psp) {
 321         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 322                 if (cpcap_charger_current_to_regval(val->intval) < 0)
 323                         return -EINVAL;
 324                 ddata->limit_current = val->intval;
 325                 schedule_delayed_work(&ddata->detect_work, 0);
 326                 break;
 327         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 328                 voltage = cpcap_charger_match_voltage(val->intval);
 329                 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
 330                 if (voltage > batvolt)
 331                         voltage = batvolt;
 332                 ddata->voltage = voltage;
 333                 schedule_delayed_work(&ddata->detect_work, 0);
 334                 break;
 335         default:
 336                 return -EINVAL;
 337         }
 338
 339         return 0;
 340 }
 341
 342 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
 343                                                enum power_supply_property psp)
 344 {
 345         switch (psp) {
 346         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 347         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 348                 return 1;
 349         default:
 350                 return 0;
 351         }
 352 }
 353
 354 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 355                                          bool enabled)
 356 {
 357         if (!ddata->gpio[0])
 358                 return;
 359
 360         gpiod_set_value(ddata->gpio[0], enabled);
 361 }
 362
 363 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 364                                              bool enabled)
 365 {
 366         if (!ddata->gpio[1])
 367                 return;
 368
 369         gpiod_set_value(ddata->gpio[1], enabled);
 370 }
 371
 372 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 373                                        int state)
 374 {
 375         const char *status;
 376
 377         if (state > POWER_SUPPLY_STATUS_FULL) {
 378                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 379
 380                 return;
 381         }
 382
 383         ddata->status = state;
 384
 385         switch (state) {
 386         case POWER_SUPPLY_STATUS_DISCHARGING:
 387                 status = "DISCONNECTED";
 388                 break;
 389         case POWER_SUPPLY_STATUS_NOT_CHARGING:
 390                 status = "DETECTING";
 391                 break;
 392         case POWER_SUPPLY_STATUS_CHARGING:
 393                 status = "CHARGING";
 394                 break;
 395         case POWER_SUPPLY_STATUS_FULL:
 396                 status = "DONE";
 397                 break;
 398         default:
 399                 return;
 400         }
 401
 402         dev_dbg(ddata->dev, "state: %s\n", status);
 403 }
 404
 405 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
 406 {
 407         int error;
 408
 409         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 410                                    CPCAP_REG_CRM_FET_OVRD |
 411                                    CPCAP_REG_CRM_FET_CTRL);
 412         if (error)
 413                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 414
 415         return error;
 416 }
 417
 418 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
 419                                 int max_voltage, int charge_current,
 420                                 int trickle_current)
 421 {
 422         int error;
 423
 424         if (!max_voltage || !charge_current)
 425                 return -EINVAL;
 426
 427         dev_dbg(ddata->dev, "enable: %i %i %i\n",
 428                 max_voltage, charge_current, trickle_current);
 429
 430         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 431                                    CPCAP_REG_CRM_CHRG_LED_EN |
 432                                    trickle_current |
 433                                    CPCAP_REG_CRM_FET_OVRD |
 434                                    CPCAP_REG_CRM_FET_CTRL |
 435                                    max_voltage |
 436                                    charge_current);
 437         if (error)
 438                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 439
 440         return error;
 441 }
 442
 443 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 444 {
 445         int error, value = 0;
 446         struct iio_channel *channel =
 447                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 448
 449         error = iio_read_channel_processed(channel, &value);
 450         if (error >= 0)
 451                 return value > 3900;
 452
 453         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 454
 455         return false;
 456 }
 457
 458 /* VBUS control functions for the USB PHY companion */
 459 static void cpcap_charger_vbus_work(struct work_struct *work)
 460 {
 461         struct cpcap_charger_ddata *ddata;
 462         bool vbus = false;
 463         int error;
 464
 465         ddata = container_of(work, struct cpcap_charger_ddata,
 466                              vbus_work.work);
 467
 468         if (ddata->vbus_enabled) {
 469                 vbus = cpcap_charger_vbus_valid(ddata);
 470                 if (vbus) {
 471                         dev_dbg(ddata->dev, "VBUS already provided\n");
 472
 473                         return;
 474                 }
 475
 476                 ddata->feeding_vbus = true;
 477                 cpcap_charger_set_cable_path(ddata, false);
 478                 cpcap_charger_set_inductive_path(ddata, false);
 479
 480                 error = cpcap_charger_disable(ddata);
 481                 if (error)
 482                         goto out_err;
 483
 484                 cpcap_charger_update_state(ddata,
 485                                            POWER_SUPPLY_STATUS_DISCHARGING);
 486
 487                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 488                                            CPCAP_BIT_VBUS_SWITCH,
 489                                            CPCAP_BIT_VBUS_SWITCH);
 490                 if (error)
 491                         goto out_err;
 492
 493                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 494                                            CPCAP_REG_CRM_RVRSMODE,
 495                                            CPCAP_REG_CRM_RVRSMODE);
 496                 if (error)
 497                         goto out_err;
 498         } else {
 499                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 500                                            CPCAP_BIT_VBUS_SWITCH, 0);
 501                 if (error)
 502                         goto out_err;
 503
 504                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 505                                            CPCAP_REG_CRM_RVRSMODE, 0);
 506                 if (error)
 507                         goto out_err;
 508
 509                 cpcap_charger_set_cable_path(ddata, true);
 510                 cpcap_charger_set_inductive_path(ddata, true);
 511                 ddata->feeding_vbus = false;
 512         }
 513
 514         return;
 515
 516 out_err:
 517         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 518         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 519                 ddata->vbus_enabled ? "enable" : "disable", error);
 520 }
 521
 522 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 523                                   bool enabled)
 524 {
 525         struct cpcap_charger_ddata *ddata =
 526                 container_of(comparator, struct cpcap_charger_ddata,
 527                              comparator);
 528
 529         ddata->vbus_enabled = enabled;
 530         schedule_delayed_work(&ddata->vbus_work, 0);
 531
 532         return 0;
 533 }
 534
 535 /* Charger interrupt handling functions */
 536
 537 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 538                                         struct cpcap_charger_ints_state *s)
 539 {
 540         int val, error;
 541
 542         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 543         if (error)
 544                 return error;
 545
 546         s->chrg_det = val & BIT(13);
 547         s->rvrs_chrg = val & BIT(12);
 548         s->vbusov = val & BIT(11);
 549
 550         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 551         if (error)
 552                 return error;
 553
 554         s->chrg_se1b = val & BIT(13);
 555         s->rvrs_mode = val & BIT(6);
 556         s->chrgcurr2 = val & BIT(5);
 557         s->chrgcurr1 = val & BIT(4);
 558         s->vbusvld = val & BIT(3);
 559
 560         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 561         if (error)
 562                 return error;
 563
 564         s->battdetb = val & BIT(6);
 565
 566         return 0;
 567 }
 568
 569 static int cpcap_charger_voltage_to_regval(int voltage)
 570 {
 571         int offset;
 572
 573         switch (voltage) {
 574         case 0 ... 4100000 - 1:
 575                 return 0;
 576         case 4100000 ... 4200000 - 1:
 577                 offset = 1;
 578                 break;
 579         case 4200000 ... 4300000 - 1:
 580                 offset = 0;
 581                 break;
 582         case 4300000 ... 4380000 - 1:
 583                 offset = -1;
 584                 break;
 585         case 4380000 ... 4440000:
 586                 offset = -2;
 587                 break;
 588         default:
 589                 return 0;
 590         }
 591
 592         return ((voltage - 4100000) / 20000) + offset;
 593 }
 594
 595 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 596                                      int state, unsigned long delay)
 597 {
 598         int error;
 599
 600         /* Update battery state before disconnecting the charger */
 601         switch (state) {
 602         case POWER_SUPPLY_STATUS_DISCHARGING:
 603         case POWER_SUPPLY_STATUS_FULL:
 604                 power_supply_changed(ddata->usb);
 605                 break;
 606         default:
 607                 break;
 608         }
 609
 610         error = cpcap_charger_disable(ddata);
 611         if (error) {
 612                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 613                 return;
 614         }
 615
 616         cpcap_charger_update_state(ddata, state);
 617         power_supply_changed(ddata->usb);
 618         schedule_delayed_work(&ddata->detect_work, delay);
 619 }
 620
 621 static void cpcap_usb_detect(struct work_struct *work)
 622 {
 623         struct cpcap_charger_ddata *ddata;
 624         struct cpcap_charger_ints_state s;
 625         int error, new_state;
 626
 627         ddata = container_of(work, struct cpcap_charger_ddata,
 628                              detect_work.work);
 629
 630         error = cpcap_charger_get_ints_state(ddata, &s);
 631         if (error)
 632                 return;
 633
 634         /* Just init the state if a charger is connected with no chrg_det set */
 635         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 636                 cpcap_charger_update_state(ddata,
 637                                            POWER_SUPPLY_STATUS_NOT_CHARGING);
 638
 639                 return;
 640         }
 641
 642         /*
 643          * If battery voltage is higher than charge voltage, it may have been
 644          * charged to 4.35V by Android. Try again in 10 minutes.
 645          */
 646         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 647                 cpcap_charger_disconnect(ddata,
 648                                          POWER_SUPPLY_STATUS_NOT_CHARGING,
 649                                          HZ * 60 * 10);
 650
 651                 return;
 652         }
 653
 654         /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
 655         usleep_range(80000, 120000);
 656
 657         /* Throttle chrgcurr2 interrupt for charger done and retry */
 658         switch (ddata->status) {
 659         case POWER_SUPPLY_STATUS_CHARGING:
 660                 if (s.chrgcurr2)
 661                         break;
 662                 new_state = POWER_SUPPLY_STATUS_FULL;
 663
 664                 if (s.chrgcurr1 && s.vbusvld) {
 665                         cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 666                         return;
 667                 }
 668                 break;
 669         case POWER_SUPPLY_STATUS_FULL:
 670                 if (!s.chrgcurr2)
 671                         break;
 672                 if (s.vbusvld)
 673                         new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
 674                 else
 675                         new_state = POWER_SUPPLY_STATUS_DISCHARGING;
 676
 677                 cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 678
 679                 return;
 680         default:
 681                 break;
 682         }
 683
 684         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 685             s.chrgcurr1) {
 686                 int max_current;
 687                 int vchrg, ichrg;
 688                 union power_supply_propval val;
 689                 struct power_supply *battery;
 690
 691                 battery = power_supply_get_by_name("battery");
 692                 if (IS_ERR_OR_NULL(battery)) {
 693                         dev_err(ddata->dev, "battery power_supply not available %li\n",
 694                                         PTR_ERR(battery));
 695                         return;
 696                 }
 697
 698                 error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
 699                 power_supply_put(battery);
 700                 if (error)
 701                         goto out_err;
 702
 703                 if (val.intval) {
 704                         max_current = 1596000;
 705                 } else {
 706                         dev_info(ddata->dev, "battery not inserted, charging disabled\n");
 707                         max_current = 0;
 708                 }
 709
 710                 if (max_current > ddata->limit_current)
 711                         max_current = ddata->limit_current;
 712
 713                 ichrg = cpcap_charger_current_to_regval(max_current);
 714                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 715                 error = cpcap_charger_enable(ddata,
 716                                              CPCAP_REG_CRM_VCHRG(vchrg),
 717                                              ichrg, 0);
 718                 if (error)
 719                         goto out_err;
 720                 cpcap_charger_update_state(ddata,
 721                                            POWER_SUPPLY_STATUS_CHARGING);
 722         } else {
 723                 error = cpcap_charger_disable(ddata);
 724                 if (error)
 725                         goto out_err;
 726                 cpcap_charger_update_state(ddata,
 727                                            POWER_SUPPLY_STATUS_DISCHARGING);
 728         }
 729
 730         power_supply_changed(ddata->usb);
 731         return;
 732
 733 out_err:
 734         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 735         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 736 }
 737
 738 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 739 {
 740         struct cpcap_charger_ddata *ddata = data;
 741
 742         if (!atomic_read(&ddata->active))
 743                 return IRQ_NONE;
 744
 745         schedule_delayed_work(&ddata->detect_work, 0);
 746
 747         return IRQ_HANDLED;
 748 }
 749
 750 static int cpcap_usb_init_irq(struct platform_device *pdev,
 751                               struct cpcap_charger_ddata *ddata,
 752                               const char *name)
 753 {
 754         struct cpcap_interrupt_desc *d;
 755         int irq, error;
 756
 757         irq = platform_get_irq_byname(pdev, name);
 758         if (irq < 0)
 759                 return -ENODEV;
 760
 761         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 762                                           cpcap_charger_irq_thread,
 763                                           IRQF_SHARED | IRQF_ONESHOT,
 764                                           name, ddata);
 765         if (error) {
 766                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 767                         name, error);
 768
 769                 return error;
 770         }
 771
 772         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 773         if (!d)
 774                 return -ENOMEM;
 775
 776         d->name = name;
 777         d->irq = irq;
 778         list_add(&d->node, &ddata->irq_list);
 779
 780         return 0;
 781 }
 782
 783 static const char * const cpcap_charger_irqs[] = {
 784         /* REG_INT_0 */
 785         "chrg_det", "rvrs_chrg",
 786
 787         /* REG_INT1 */
 788         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 789
 790         /* REG_INT_3 */
 791         "battdetb",
 792 };
 793
 794 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 795                                      struct cpcap_charger_ddata *ddata)
 796 {
 797         int i, error;
 798
 799         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 800                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 801                 if (error)
 802                         return error;
 803         }
 804
 805         return 0;
 806 }
 807
 808 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 809 {
 810         int i;
 811
 812         for (i = 0; i < 2; i++) {
 813                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 814                                                       i, GPIOD_OUT_HIGH);
 815                 if (IS_ERR(ddata->gpio[i])) {
 816                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 817                                  i, PTR_ERR(ddata->gpio[i]));
 818                         ddata->gpio[i] = NULL;
 819                 }
 820         }
 821 }
 822
 823 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 824 {
 825         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 826                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 827         };
 828         int error, i;
 829
 830         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 831                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 832                                                           names[i]);
 833                 if (IS_ERR(ddata->channels[i])) {
 834                         error = PTR_ERR(ddata->channels[i]);
 835                         goto out_err;
 836                 }
 837
 838                 if (!ddata->channels[i]->indio_dev) {
 839                         error = -ENXIO;
 840                         goto out_err;
 841                 }
 842         }
 843
 844         return 0;
 845
 846 out_err:
 847         if (error != -EPROBE_DEFER)
 848                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 849                         error);
 850
 851         return error;
 852 }
 853
 854 static char *cpcap_charger_supplied_to[] = {
 855         "battery",
 856 };
 857
 858 static const struct power_supply_desc cpcap_charger_usb_desc = {
 859         .name           = "usb",
 860         .type           = POWER_SUPPLY_TYPE_USB,
 861         .properties     = cpcap_charger_props,
 862         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 863         .get_property   = cpcap_charger_get_property,
 864         .set_property   = cpcap_charger_set_property,
 865         .property_is_writeable = cpcap_charger_property_is_writeable,
 866 };
 867
 868 #ifdef CONFIG_OF
 869 static const struct of_device_id cpcap_charger_id_table[] = {
 870         {
 871                 .compatible = "motorola,mapphone-cpcap-charger",
 872         },
 873         {},
 874 };
 875 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 876 #endif
 877
 878 static int cpcap_charger_probe(struct platform_device *pdev)
 879 {
 880         struct cpcap_charger_ddata *ddata;
 881         const struct of_device_id *of_id;
 882         struct power_supply_config psy_cfg = {};
 883         int error;
 884
 885         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 886                                 &pdev->dev);
 887         if (!of_id)
 888                 return -EINVAL;
 889
 890         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 891         if (!ddata)
 892                 return -ENOMEM;
 893
 894         ddata->dev = &pdev->dev;
 895         ddata->voltage = 4200000;
 896         ddata->limit_current = 532000;
 897
 898         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 899         if (!ddata->reg)
 900                 return -ENODEV;
 901
 902         INIT_LIST_HEAD(&ddata->irq_list);
 903         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 904         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 905         platform_set_drvdata(pdev, ddata);
 906
 907         error = cpcap_charger_init_iio(ddata);
 908         if (error)
 909                 return error;
 910
 911         atomic_set(&ddata->active, 1);
 912
 913         psy_cfg.of_node = pdev->dev.of_node;
 914         psy_cfg.drv_data = ddata;
 915         psy_cfg.supplied_to = cpcap_charger_supplied_to;
 916         psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
 917
 918         ddata->usb = devm_power_supply_register(ddata->dev,
 919                                                 &cpcap_charger_usb_desc,
 920                                                 &psy_cfg);
 921         if (IS_ERR(ddata->usb)) {
 922                 error = PTR_ERR(ddata->usb);
 923                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 924                         error);
 925
 926                 return error;
 927         }
 928
 929         error = cpcap_usb_init_interrupts(pdev, ddata);
 930         if (error)
 931                 return error;
 932
 933         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 934         error = omap_usb2_set_comparator(&ddata->comparator);
 935         if (error == -ENODEV) {
 936                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 937                 return -EPROBE_DEFER;
 938         }
 939
 940         cpcap_charger_init_optional_gpios(ddata);
 941
 942         schedule_delayed_work(&ddata->detect_work, 0);
 943
 944         return 0;
 945 }
 946
 947 static void cpcap_charger_shutdown(struct platform_device *pdev)
 948 {
 949         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 950         int error;
 951
 952         atomic_set(&ddata->active, 0);
 953         error = omap_usb2_set_comparator(NULL);
 954         if (error)
 955                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 956                          error);
 957
 958         error = cpcap_charger_disable(ddata);
 959         if (error) {
 960                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 961                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 962                          error);
 963         }
 964         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
 965         cancel_delayed_work_sync(&ddata->vbus_work);
 966         cancel_delayed_work_sync(&ddata->detect_work);
 967 }
 968
 969 static int cpcap_charger_remove(struct platform_device *pdev)
 970 {
 971         cpcap_charger_shutdown(pdev);
 972
 973         return 0;
 974 }
 975
 976 static struct platform_driver cpcap_charger_driver = {
 977         .probe = cpcap_charger_probe,
 978         .driver = {
 979                 .name   = "cpcap-charger",
 980                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 981         },
 982         .shutdown = cpcap_charger_shutdown,
 983         .remove = cpcap_charger_remove,
 984 };
 985 module_platform_driver(cpcap_charger_driver);
 986
 987 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 988 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 989 MODULE_LICENSE("GPL v2");
 990 MODULE_ALIAS("platform:cpcap-charger");