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  * 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 /* No battery always shows temperature of -40000 */
 177 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 178 {
 179         struct iio_channel *channel;
 180         int error, temperature;
 181
 182         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 183         error = iio_read_channel_processed(channel, &temperature);
 184         if (error < 0) {
 185                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 186
 187                 return false;
 188         }
 189
 190         return temperature > -20000 && temperature < 60000;
 191 }
 192
 193 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 194 {
 195         struct iio_channel *channel;
 196         int error, value = 0;
 197
 198         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 199         error = iio_read_channel_processed(channel, &value);
 200         if (error < 0) {
 201                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 202
 203                 return 0;
 204         }
 205
 206         return value;
 207 }
 208
 209 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 210 {
 211         struct iio_channel *channel;
 212         int error, value = 0;
 213
 214         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 215         error = iio_read_channel_processed(channel, &value);
 216         if (error < 0) {
 217                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 218
 219                 return 0;
 220         }
 221
 222         return value;
 223 }
 224
 225 static int cpcap_charger_get_property(struct power_supply *psy,
 226                                       enum power_supply_property psp,
 227                                       union power_supply_propval *val)
 228 {
 229         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 230
 231         switch (psp) {
 232         case POWER_SUPPLY_PROP_STATUS:
 233                 val->intval = ddata->status;
 234                 break;
 235         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 236                 val->intval = ddata->limit_current;
 237                 break;
 238         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 239                 val->intval = ddata->voltage;
 240                 break;
 241         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 242                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 243                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 244                                 1000;
 245                 else
 246                         val->intval = 0;
 247                 break;
 248         case POWER_SUPPLY_PROP_CURRENT_NOW:
 249                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 250                         val->intval = cpcap_charger_get_charge_current(ddata) *
 251                                 1000;
 252                 else
 253                         val->intval = 0;
 254                 break;
 255         case POWER_SUPPLY_PROP_ONLINE:
 256                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261
 262         return 0;
 263 }
 264
 265 static int cpcap_charger_match_voltage(int voltage)
 266 {
 267         switch (voltage) {
 268         case 0 ... 4100000 - 1: return 3800000;
 269         case 4100000 ... 4120000 - 1: return 4100000;
 270         case 4120000 ... 4150000 - 1: return 4120000;
 271         case 4150000 ... 4170000 - 1: return 4150000;
 272         case 4170000 ... 4200000 - 1: return 4170000;
 273         case 4200000 ... 4230000 - 1: return 4200000;
 274         case 4230000 ... 4250000 - 1: return 4230000;
 275         case 4250000 ... 4270000 - 1: return 4250000;
 276         case 4270000 ... 4300000 - 1: return 4270000;
 277         case 4300000 ... 4330000 - 1: return 4300000;
 278         case 4330000 ... 4350000 - 1: return 4330000;
 279         case 4350000 ... 4380000 - 1: return 4350000;
 280         case 4380000 ... 4400000 - 1: return 4380000;
 281         case 4400000 ... 4420000 - 1: return 4400000;
 282         case 4420000 ... 4440000 - 1: return 4420000;
 283         case 4440000: return 4440000;
 284         default: return 0;
 285         }
 286 }
 287
 288 static int
 289 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
 290 {
 291         union power_supply_propval prop;
 292         struct power_supply *battery;
 293         int voltage = ddata->voltage;
 294         int error;
 295
 296         battery = power_supply_get_by_name("battery");
 297         if (battery) {
 298                 error = power_supply_get_property(battery,
 299                                 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 300                                 &prop);
 301                 if (!error)
 302                         voltage = prop.intval;
 303
 304                 power_supply_put(battery);
 305         }
 306
 307         return voltage;
 308 }
 309
 310 static int cpcap_charger_current_to_regval(int microamp)
 311 {
 312         int miliamp = microamp / 1000;
 313         int res;
 314
 315         if (miliamp < 0)
 316                 return -EINVAL;
 317         if (miliamp < 70)
 318                 return CPCAP_REG_CRM_ICHRG(0x0);
 319         if (miliamp < 177)
 320                 return CPCAP_REG_CRM_ICHRG(0x1);
 321         if (miliamp >= 1596)
 322                 return CPCAP_REG_CRM_ICHRG(0xe);
 323
 324         res = microamp / 88666;
 325         if (res > 0xd)
 326                 res = 0xd;
 327         return CPCAP_REG_CRM_ICHRG(res);
 328 }
 329
 330 static int cpcap_charger_set_property(struct power_supply *psy,
 331                                       enum power_supply_property psp,
 332                                       const union power_supply_propval *val)
 333 {
 334         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 335         int voltage, batvolt;
 336
 337         switch (psp) {
 338         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 339                 if (cpcap_charger_current_to_regval(val->intval) < 0)
 340                         return -EINVAL;
 341                 ddata->limit_current = val->intval;
 342                 schedule_delayed_work(&ddata->detect_work, 0);
 343                 break;
 344         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 345                 voltage = cpcap_charger_match_voltage(val->intval);
 346                 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
 347                 if (voltage > batvolt)
 348                         voltage = batvolt;
 349                 ddata->voltage = voltage;
 350                 schedule_delayed_work(&ddata->detect_work, 0);
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
 360                                                enum power_supply_property psp)
 361 {
 362         switch (psp) {
 363         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 364         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 365                 return 1;
 366         default:
 367                 return 0;
 368         }
 369 }
 370
 371 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 372                                          bool enabled)
 373 {
 374         if (!ddata->gpio[0])
 375                 return;
 376
 377         gpiod_set_value(ddata->gpio[0], enabled);
 378 }
 379
 380 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 381                                              bool enabled)
 382 {
 383         if (!ddata->gpio[1])
 384                 return;
 385
 386         gpiod_set_value(ddata->gpio[1], enabled);
 387 }
 388
 389 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 390                                        int state)
 391 {
 392         const char *status;
 393
 394         if (state > POWER_SUPPLY_STATUS_FULL) {
 395                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 396
 397                 return;
 398         }
 399
 400         ddata->status = state;
 401
 402         switch (state) {
 403         case POWER_SUPPLY_STATUS_DISCHARGING:
 404                 status = "DISCONNECTED";
 405                 break;
 406         case POWER_SUPPLY_STATUS_NOT_CHARGING:
 407                 status = "DETECTING";
 408                 break;
 409         case POWER_SUPPLY_STATUS_CHARGING:
 410                 status = "CHARGING";
 411                 break;
 412         case POWER_SUPPLY_STATUS_FULL:
 413                 status = "DONE";
 414                 break;
 415         default:
 416                 return;
 417         }
 418
 419         dev_dbg(ddata->dev, "state: %s\n", status);
 420 }
 421
 422 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
 423 {
 424         int error;
 425
 426         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 427                                    CPCAP_REG_CRM_FET_OVRD |
 428                                    CPCAP_REG_CRM_FET_CTRL);
 429         if (error)
 430                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 431
 432         return error;
 433 }
 434
 435 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
 436                                 int max_voltage, int charge_current,
 437                                 int trickle_current)
 438 {
 439         int error;
 440
 441         if (!max_voltage || !charge_current)
 442                 return -EINVAL;
 443
 444         dev_dbg(ddata->dev, "enable: %i %i %i\n",
 445                 max_voltage, charge_current, trickle_current);
 446
 447         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 448                                    CPCAP_REG_CRM_CHRG_LED_EN |
 449                                    trickle_current |
 450                                    CPCAP_REG_CRM_FET_OVRD |
 451                                    CPCAP_REG_CRM_FET_CTRL |
 452                                    max_voltage |
 453                                    charge_current);
 454         if (error)
 455                 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 456
 457         return error;
 458 }
 459
 460 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 461 {
 462         int error, value = 0;
 463         struct iio_channel *channel =
 464                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 465
 466         error = iio_read_channel_processed(channel, &value);
 467         if (error >= 0)
 468                 return value > 3900;
 469
 470         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 471
 472         return false;
 473 }
 474
 475 /* VBUS control functions for the USB PHY companion */
 476 static void cpcap_charger_vbus_work(struct work_struct *work)
 477 {
 478         struct cpcap_charger_ddata *ddata;
 479         bool vbus = false;
 480         int error;
 481
 482         ddata = container_of(work, struct cpcap_charger_ddata,
 483                              vbus_work.work);
 484
 485         if (ddata->vbus_enabled) {
 486                 vbus = cpcap_charger_vbus_valid(ddata);
 487                 if (vbus) {
 488                         dev_dbg(ddata->dev, "VBUS already provided\n");
 489
 490                         return;
 491                 }
 492
 493                 ddata->feeding_vbus = true;
 494                 cpcap_charger_set_cable_path(ddata, false);
 495                 cpcap_charger_set_inductive_path(ddata, false);
 496
 497                 error = cpcap_charger_disable(ddata);
 498                 if (error)
 499                         goto out_err;
 500
 501                 cpcap_charger_update_state(ddata,
 502                                            POWER_SUPPLY_STATUS_DISCHARGING);
 503
 504                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 505                                            CPCAP_BIT_VBUS_SWITCH,
 506                                            CPCAP_BIT_VBUS_SWITCH);
 507                 if (error)
 508                         goto out_err;
 509
 510                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 511                                            CPCAP_REG_CRM_RVRSMODE,
 512                                            CPCAP_REG_CRM_RVRSMODE);
 513                 if (error)
 514                         goto out_err;
 515         } else {
 516                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 517                                            CPCAP_BIT_VBUS_SWITCH, 0);
 518                 if (error)
 519                         goto out_err;
 520
 521                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 522                                            CPCAP_REG_CRM_RVRSMODE, 0);
 523                 if (error)
 524                         goto out_err;
 525
 526                 cpcap_charger_set_cable_path(ddata, true);
 527                 cpcap_charger_set_inductive_path(ddata, true);
 528                 ddata->feeding_vbus = false;
 529         }
 530
 531         return;
 532
 533 out_err:
 534         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 535         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 536                 ddata->vbus_enabled ? "enable" : "disable", error);
 537 }
 538
 539 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 540                                   bool enabled)
 541 {
 542         struct cpcap_charger_ddata *ddata =
 543                 container_of(comparator, struct cpcap_charger_ddata,
 544                              comparator);
 545
 546         ddata->vbus_enabled = enabled;
 547         schedule_delayed_work(&ddata->vbus_work, 0);
 548
 549         return 0;
 550 }
 551
 552 /* Charger interrupt handling functions */
 553
 554 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 555                                         struct cpcap_charger_ints_state *s)
 556 {
 557         int val, error;
 558
 559         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 560         if (error)
 561                 return error;
 562
 563         s->chrg_det = val & BIT(13);
 564         s->rvrs_chrg = val & BIT(12);
 565         s->vbusov = val & BIT(11);
 566
 567         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 568         if (error)
 569                 return error;
 570
 571         s->chrg_se1b = val & BIT(13);
 572         s->rvrs_mode = val & BIT(6);
 573         s->chrgcurr2 = val & BIT(5);
 574         s->chrgcurr1 = val & BIT(4);
 575         s->vbusvld = val & BIT(3);
 576
 577         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 578         if (error)
 579                 return error;
 580
 581         s->battdetb = val & BIT(6);
 582
 583         return 0;
 584 }
 585
 586 static int cpcap_charger_voltage_to_regval(int voltage)
 587 {
 588         int offset;
 589
 590         switch (voltage) {
 591         case 0 ... 4100000 - 1:
 592                 return 0;
 593         case 4100000 ... 4200000 - 1:
 594                 offset = 1;
 595                 break;
 596         case 4200000 ... 4300000 - 1:
 597                 offset = 0;
 598                 break;
 599         case 4300000 ... 4380000 - 1:
 600                 offset = -1;
 601                 break;
 602         case 4380000 ... 4440000:
 603                 offset = -2;
 604                 break;
 605         default:
 606                 return 0;
 607         }
 608
 609         return ((voltage - 4100000) / 20000) + offset;
 610 }
 611
 612 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 613                                      int state, unsigned long delay)
 614 {
 615         int error;
 616
 617         /* Update battery state before disconnecting the charger */
 618         switch (state) {
 619         case POWER_SUPPLY_STATUS_DISCHARGING:
 620         case POWER_SUPPLY_STATUS_FULL:
 621                 power_supply_changed(ddata->usb);
 622                 break;
 623         default:
 624                 break;
 625         }
 626
 627         error = cpcap_charger_disable(ddata);
 628         if (error) {
 629                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 630                 return;
 631         }
 632
 633         cpcap_charger_update_state(ddata, state);
 634         power_supply_changed(ddata->usb);
 635         schedule_delayed_work(&ddata->detect_work, delay);
 636 }
 637
 638 static void cpcap_usb_detect(struct work_struct *work)
 639 {
 640         struct cpcap_charger_ddata *ddata;
 641         struct cpcap_charger_ints_state s;
 642         int error, new_state;
 643
 644         ddata = container_of(work, struct cpcap_charger_ddata,
 645                              detect_work.work);
 646
 647         error = cpcap_charger_get_ints_state(ddata, &s);
 648         if (error)
 649                 return;
 650
 651         /* Just init the state if a charger is connected with no chrg_det set */
 652         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 653                 cpcap_charger_update_state(ddata,
 654                                            POWER_SUPPLY_STATUS_NOT_CHARGING);
 655
 656                 return;
 657         }
 658
 659         /*
 660          * If battery voltage is higher than charge voltage, it may have been
 661          * charged to 4.35V by Android. Try again in 10 minutes.
 662          */
 663         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 664                 cpcap_charger_disconnect(ddata,
 665                                          POWER_SUPPLY_STATUS_NOT_CHARGING,
 666                                          HZ * 60 * 10);
 667
 668                 return;
 669         }
 670
 671         /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
 672         usleep_range(80000, 120000);
 673
 674         /* Throttle chrgcurr2 interrupt for charger done and retry */
 675         switch (ddata->status) {
 676         case POWER_SUPPLY_STATUS_CHARGING:
 677                 if (s.chrgcurr2)
 678                         break;
 679                 new_state = POWER_SUPPLY_STATUS_FULL;
 680
 681                 if (s.chrgcurr1 && s.vbusvld) {
 682                         cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 683                         return;
 684                 }
 685                 break;
 686         case POWER_SUPPLY_STATUS_FULL:
 687                 if (!s.chrgcurr2)
 688                         break;
 689                 if (s.vbusvld)
 690                         new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
 691                 else
 692                         new_state = POWER_SUPPLY_STATUS_DISCHARGING;
 693
 694                 cpcap_charger_disconnect(ddata, new_state, HZ * 5);
 695
 696                 return;
 697         default:
 698                 break;
 699         }
 700
 701         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 702             s.chrgcurr1) {
 703                 int max_current = 532000;
 704                 int vchrg, ichrg;
 705
 706                 if (cpcap_charger_battery_found(ddata))
 707                         max_current = 1596000;
 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 #ifdef CONFIG_OF
 868 static const struct of_device_id cpcap_charger_id_table[] = {
 869         {
 870                 .compatible = "motorola,mapphone-cpcap-charger",
 871         },
 872         {},
 873 };
 874 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 875 #endif
 876
 877 static int cpcap_charger_probe(struct platform_device *pdev)
 878 {
 879         struct cpcap_charger_ddata *ddata;
 880         const struct of_device_id *of_id;
 881         struct power_supply_config psy_cfg = {};
 882         int error;
 883
 884         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 885                                 &pdev->dev);
 886         if (!of_id)
 887                 return -EINVAL;
 888
 889         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 890         if (!ddata)
 891                 return -ENOMEM;
 892
 893         ddata->dev = &pdev->dev;
 894         ddata->voltage = 4200000;
 895         ddata->limit_current = 532000;
 896
 897         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 898         if (!ddata->reg)
 899                 return -ENODEV;
 900
 901         INIT_LIST_HEAD(&ddata->irq_list);
 902         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 903         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 904         platform_set_drvdata(pdev, ddata);
 905
 906         error = cpcap_charger_init_iio(ddata);
 907         if (error)
 908                 return error;
 909
 910         atomic_set(&ddata->active, 1);
 911
 912         psy_cfg.of_node = pdev->dev.of_node;
 913         psy_cfg.drv_data = ddata;
 914         psy_cfg.supplied_to = cpcap_charger_supplied_to;
 915         psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
 916
 917         ddata->usb = devm_power_supply_register(ddata->dev,
 918                                                 &cpcap_charger_usb_desc,
 919                                                 &psy_cfg);
 920         if (IS_ERR(ddata->usb)) {
 921                 error = PTR_ERR(ddata->usb);
 922                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 923                         error);
 924
 925                 return error;
 926         }
 927
 928         error = cpcap_usb_init_interrupts(pdev, ddata);
 929         if (error)
 930                 return error;
 931
 932         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 933         error = omap_usb2_set_comparator(&ddata->comparator);
 934         if (error == -ENODEV) {
 935                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 936                 return -EPROBE_DEFER;
 937         }
 938
 939         cpcap_charger_init_optional_gpios(ddata);
 940
 941         schedule_delayed_work(&ddata->detect_work, 0);
 942
 943         return 0;
 944 }
 945
 946 static void cpcap_charger_shutdown(struct platform_device *pdev)
 947 {
 948         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 949         int error;
 950
 951         atomic_set(&ddata->active, 0);
 952         error = omap_usb2_set_comparator(NULL);
 953         if (error)
 954                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 955                          error);
 956
 957         error = cpcap_charger_disable(ddata);
 958         if (error) {
 959                 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
 960                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 961                          error);
 962         }
 963         cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
 964         cancel_delayed_work_sync(&ddata->vbus_work);
 965         cancel_delayed_work_sync(&ddata->detect_work);
 966 }
 967
 968 static int cpcap_charger_remove(struct platform_device *pdev)
 969 {
 970         cpcap_charger_shutdown(pdev);
 971
 972         return 0;
 973 }
 974
 975 static struct platform_driver cpcap_charger_driver = {
 976         .probe = cpcap_charger_probe,
 977         .driver = {
 978                 .name   = "cpcap-charger",
 979                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 980         },
 981         .shutdown = cpcap_charger_shutdown,
 982         .remove = cpcap_charger_remove,
 983 };
 984 module_platform_driver(cpcap_charger_driver);
 985
 986 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 987 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 988 MODULE_LICENSE("GPL v2");
 989 MODULE_ALIAS("platform:cpcap-charger");