drivers/power/supply/cpcap-charger.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Motorola CPCAP PMIC battery charger driver
   4  *
   5  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
   6  *
   7  * Rewritten for Linux power framework with some parts based on
   8  * on earlier driver found in the Motorola Linux kernel:
   9  *
  10  * Copyright (C) 2009-2010 Motorola, Inc.
  11  */
  12
  13 #include <linux/atomic.h>
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/notifier.h>
  20 #include <linux/of.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/regmap.h>
  25
  26 #include <linux/gpio/consumer.h>
  27 #include <linux/usb/phy_companion.h>
  28 #include <linux/phy/omap_usb.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/iio/consumer.h>
  31 #include <linux/mfd/motorola-cpcap.h>
  32
  33 /*
  34  * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
  35  * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
  36  * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
  37  * and values for CPCAP are different, but some of the internal components seem
  38  * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
  39  * bits that seem to describe the CRM register.
  40  */
  41 #define CPCAP_REG_CRM_UNUSED_641_15     BIT(15) /* 641 = register number */
  42 #define CPCAP_REG_CRM_UNUSED_641_14     BIT(14) /* 641 = register number */
  43 #define CPCAP_REG_CRM_CHRG_LED_EN       BIT(13) /* Charger LED */
  44 #define CPCAP_REG_CRM_RVRSMODE          BIT(12) /* USB VBUS output enable */
  45 #define CPCAP_REG_CRM_ICHRG_TR1         BIT(11) /* Trickle charge current */
  46 #define CPCAP_REG_CRM_ICHRG_TR0         BIT(10)
  47 #define CPCAP_REG_CRM_FET_OVRD          BIT(9)  /* 0 = hardware, 1 = FET_CTRL */
  48 #define CPCAP_REG_CRM_FET_CTRL          BIT(8)  /* BPFET 1 if FET_OVRD set */
  49 #define CPCAP_REG_CRM_VCHRG3            BIT(7)  /* Charge voltage bits */
  50 #define CPCAP_REG_CRM_VCHRG2            BIT(6)
  51 #define CPCAP_REG_CRM_VCHRG1            BIT(5)
  52 #define CPCAP_REG_CRM_VCHRG0            BIT(4)
  53 #define CPCAP_REG_CRM_ICHRG3            BIT(3)  /* Charge current bits */
  54 #define CPCAP_REG_CRM_ICHRG2            BIT(2)
  55 #define CPCAP_REG_CRM_ICHRG1            BIT(1)
  56 #define CPCAP_REG_CRM_ICHRG0            BIT(0)
  57
  58 /* CPCAP_REG_CRM trickle charge voltages */
  59 #define CPCAP_REG_CRM_TR(val)           (((val) & 0x3) << 10)
  60 #define CPCAP_REG_CRM_TR_0A00           CPCAP_REG_CRM_TR(0x0)
  61 #define CPCAP_REG_CRM_TR_0A24           CPCAP_REG_CRM_TR(0x1)
  62 #define CPCAP_REG_CRM_TR_0A48           CPCAP_REG_CRM_TR(0x2)
  63 #define CPCAP_REG_CRM_TR_0A72           CPCAP_REG_CRM_TR(0x4)
  64
  65 /*
  66  * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
  67  * Note that these register bits don't match MC13783UG.pdf VCHRG
  68  * register bits.
  69  */
  70 #define CPCAP_REG_CRM_VCHRG(val)        (((val) & 0xf) << 4)
  71 #define CPCAP_REG_CRM_VCHRG_3V80        CPCAP_REG_CRM_VCHRG(0x0)
  72 #define CPCAP_REG_CRM_VCHRG_4V10        CPCAP_REG_CRM_VCHRG(0x1)
  73 #define CPCAP_REG_CRM_VCHRG_4V12        CPCAP_REG_CRM_VCHRG(0x2)
  74 #define CPCAP_REG_CRM_VCHRG_4V15        CPCAP_REG_CRM_VCHRG(0x3)
  75 #define CPCAP_REG_CRM_VCHRG_4V17        CPCAP_REG_CRM_VCHRG(0x4)
  76 #define CPCAP_REG_CRM_VCHRG_4V20        CPCAP_REG_CRM_VCHRG(0x5)
  77 #define CPCAP_REG_CRM_VCHRG_4V23        CPCAP_REG_CRM_VCHRG(0x6)
  78 #define CPCAP_REG_CRM_VCHRG_4V25        CPCAP_REG_CRM_VCHRG(0x7)
  79 #define CPCAP_REG_CRM_VCHRG_4V27        CPCAP_REG_CRM_VCHRG(0x8)
  80 #define CPCAP_REG_CRM_VCHRG_4V30        CPCAP_REG_CRM_VCHRG(0x9)
  81 #define CPCAP_REG_CRM_VCHRG_4V33        CPCAP_REG_CRM_VCHRG(0xa)
  82 #define CPCAP_REG_CRM_VCHRG_4V35        CPCAP_REG_CRM_VCHRG(0xb)
  83 #define CPCAP_REG_CRM_VCHRG_4V38        CPCAP_REG_CRM_VCHRG(0xc)
  84 #define CPCAP_REG_CRM_VCHRG_4V40        CPCAP_REG_CRM_VCHRG(0xd)
  85 #define CPCAP_REG_CRM_VCHRG_4V42        CPCAP_REG_CRM_VCHRG(0xe)
  86 #define CPCAP_REG_CRM_VCHRG_4V44        CPCAP_REG_CRM_VCHRG(0xf)
  87
  88 /*
  89  * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
  90  * values in "Table 8-3. Charge Path Regulator Current Limit
  91  * Characteristics" for the nominal values.
  92  */
  93 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  94 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  95 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  96 #define CPCAP_REG_CRM_ICHRG_0A177       CPCAP_REG_CRM_ICHRG(0x2)
  97 #define CPCAP_REG_CRM_ICHRG_0A266       CPCAP_REG_CRM_ICHRG(0x3)
  98 #define CPCAP_REG_CRM_ICHRG_0A355       CPCAP_REG_CRM_ICHRG(0x4)
  99 #define CPCAP_REG_CRM_ICHRG_0A443       CPCAP_REG_CRM_ICHRG(0x5)
 100 #define CPCAP_REG_CRM_ICHRG_0A532       CPCAP_REG_CRM_ICHRG(0x6)
 101 #define CPCAP_REG_CRM_ICHRG_0A621       CPCAP_REG_CRM_ICHRG(0x7)
 102 #define CPCAP_REG_CRM_ICHRG_0A709       CPCAP_REG_CRM_ICHRG(0x8)
 103 #define CPCAP_REG_CRM_ICHRG_0A798       CPCAP_REG_CRM_ICHRG(0x9)
 104 #define CPCAP_REG_CRM_ICHRG_0A886       CPCAP_REG_CRM_ICHRG(0xa)
 105 #define CPCAP_REG_CRM_ICHRG_0A975       CPCAP_REG_CRM_ICHRG(0xb)
 106 #define CPCAP_REG_CRM_ICHRG_1A064       CPCAP_REG_CRM_ICHRG(0xc)
 107 #define CPCAP_REG_CRM_ICHRG_1A152       CPCAP_REG_CRM_ICHRG(0xd)
 108 #define CPCAP_REG_CRM_ICHRG_1A596       CPCAP_REG_CRM_ICHRG(0xe)
 109 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 110
 111 /* CPCAP_REG_VUSBC register bits needed for VBUS */
 112 #define CPCAP_BIT_VBUS_SWITCH           BIT(0)  /* VBUS boost to 5V */
 113
 114 enum {
 115         CPCAP_CHARGER_IIO_BATTDET,
 116         CPCAP_CHARGER_IIO_VOLTAGE,
 117         CPCAP_CHARGER_IIO_VBUS,
 118         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 119         CPCAP_CHARGER_IIO_BATT_CURRENT,
 120         CPCAP_CHARGER_IIO_NR,
 121 };
 122
 123 enum {
 124         CPCAP_CHARGER_DISCONNECTED,
 125         CPCAP_CHARGER_DETECTING,
 126         CPCAP_CHARGER_CHARGING,
 127         CPCAP_CHARGER_DONE,
 128 };
 129
 130 struct cpcap_charger_ddata {
 131         struct device *dev;
 132         struct regmap *reg;
 133         struct list_head irq_list;
 134         struct delayed_work detect_work;
 135         struct delayed_work vbus_work;
 136         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 137
 138         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 139
 140         struct power_supply *usb;
 141
 142         struct phy_companion comparator;        /* For USB VBUS */
 143         unsigned int vbus_enabled:1;
 144         unsigned int feeding_vbus:1;
 145         atomic_t active;
 146
 147         int status;
 148         int state;
 149         int voltage;
 150 };
 151
 152 struct cpcap_interrupt_desc {
 153         int irq;
 154         struct list_head node;
 155         const char *name;
 156 };
 157
 158 struct cpcap_charger_ints_state {
 159         bool chrg_det;
 160         bool rvrs_chrg;
 161         bool vbusov;
 162
 163         bool chrg_se1b;
 164         bool rvrs_mode;
 165         bool chrgcurr2;
 166         bool chrgcurr1;
 167         bool vbusvld;
 168
 169         bool battdetb;
 170 };
 171
 172 static enum power_supply_property cpcap_charger_props[] = {
 173         POWER_SUPPLY_PROP_STATUS,
 174         POWER_SUPPLY_PROP_ONLINE,
 175         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 176         POWER_SUPPLY_PROP_CURRENT_NOW,
 177 };
 178
 179 /* No battery always shows temperature of -40000 */
 180 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 181 {
 182         struct iio_channel *channel;
 183         int error, temperature;
 184
 185         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 186         error = iio_read_channel_processed(channel, &temperature);
 187         if (error < 0) {
 188                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 189
 190                 return false;
 191         }
 192
 193         return temperature > -20000 && temperature < 60000;
 194 }
 195
 196 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 197 {
 198         struct iio_channel *channel;
 199         int error, value = 0;
 200
 201         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 202         error = iio_read_channel_processed(channel, &value);
 203         if (error < 0) {
 204                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 205
 206                 return 0;
 207         }
 208
 209         return value;
 210 }
 211
 212 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 213 {
 214         struct iio_channel *channel;
 215         int error, value = 0;
 216
 217         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 218         error = iio_read_channel_processed(channel, &value);
 219         if (error < 0) {
 220                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 221
 222                 return 0;
 223         }
 224
 225         return value;
 226 }
 227
 228 static int cpcap_charger_get_property(struct power_supply *psy,
 229                                       enum power_supply_property psp,
 230                                       union power_supply_propval *val)
 231 {
 232         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 233
 234         switch (psp) {
 235         case POWER_SUPPLY_PROP_STATUS:
 236                 val->intval = ddata->status;
 237                 break;
 238         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 239                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 240                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 241                                 1000;
 242                 else
 243                         val->intval = 0;
 244                 break;
 245         case POWER_SUPPLY_PROP_CURRENT_NOW:
 246                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 247                         val->intval = cpcap_charger_get_charge_current(ddata) *
 248                                 1000;
 249                 else
 250                         val->intval = 0;
 251                 break;
 252         case POWER_SUPPLY_PROP_ONLINE:
 253                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 254                 break;
 255         default:
 256                 return -EINVAL;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 263                                          bool enabled)
 264 {
 265         if (!ddata->gpio[0])
 266                 return;
 267
 268         gpiod_set_value(ddata->gpio[0], enabled);
 269 }
 270
 271 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 272                                              bool enabled)
 273 {
 274         if (!ddata->gpio[1])
 275                 return;
 276
 277         gpiod_set_value(ddata->gpio[1], enabled);
 278 }
 279
 280 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 281                                    int max_voltage, int charge_current,
 282                                    int trickle_current)
 283 {
 284         bool enable;
 285         int error;
 286
 287         enable = (charge_current || trickle_current);
 288         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 289
 290         if (!enable) {
 291                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 292                                            0x3fff,
 293                                            CPCAP_REG_CRM_FET_OVRD |
 294                                            CPCAP_REG_CRM_FET_CTRL);
 295                 if (error) {
 296                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 297                         goto out_err;
 298                 }
 299
 300                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 301
 302                 return 0;
 303         }
 304
 305         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 306                                    CPCAP_REG_CRM_CHRG_LED_EN |
 307                                    trickle_current |
 308                                    CPCAP_REG_CRM_FET_OVRD |
 309                                    CPCAP_REG_CRM_FET_CTRL |
 310                                    max_voltage |
 311                                    charge_current);
 312         if (error) {
 313                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 314                 goto out_err;
 315         }
 316
 317         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 318
 319         return 0;
 320
 321 out_err:
 322         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 323
 324         return error;
 325 }
 326
 327 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 328 {
 329         int error, value = 0;
 330         struct iio_channel *channel =
 331                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 332
 333         error = iio_read_channel_processed(channel, &value);
 334         if (error >= 0)
 335                 return value > 3900 ? true : false;
 336
 337         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 338
 339         return false;
 340 }
 341
 342 /* VBUS control functions for the USB PHY companion */
 343 static void cpcap_charger_vbus_work(struct work_struct *work)
 344 {
 345         struct cpcap_charger_ddata *ddata;
 346         bool vbus = false;
 347         int error;
 348
 349         ddata = container_of(work, struct cpcap_charger_ddata,
 350                              vbus_work.work);
 351
 352         if (ddata->vbus_enabled) {
 353                 vbus = cpcap_charger_vbus_valid(ddata);
 354                 if (vbus) {
 355                         dev_info(ddata->dev, "VBUS already provided\n");
 356
 357                         return;
 358                 }
 359
 360                 ddata->feeding_vbus = true;
 361                 cpcap_charger_set_cable_path(ddata, false);
 362                 cpcap_charger_set_inductive_path(ddata, false);
 363
 364                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 365                 if (error)
 366                         goto out_err;
 367
 368                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 369                                            CPCAP_BIT_VBUS_SWITCH,
 370                                            CPCAP_BIT_VBUS_SWITCH);
 371                 if (error)
 372                         goto out_err;
 373
 374                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 375                                            CPCAP_REG_CRM_RVRSMODE,
 376                                            CPCAP_REG_CRM_RVRSMODE);
 377                 if (error)
 378                         goto out_err;
 379         } else {
 380                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 381                                            CPCAP_BIT_VBUS_SWITCH, 0);
 382                 if (error)
 383                         goto out_err;
 384
 385                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 386                                            CPCAP_REG_CRM_RVRSMODE, 0);
 387                 if (error)
 388                         goto out_err;
 389
 390                 cpcap_charger_set_cable_path(ddata, true);
 391                 cpcap_charger_set_inductive_path(ddata, true);
 392                 ddata->feeding_vbus = false;
 393         }
 394
 395         return;
 396
 397 out_err:
 398         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 399                 ddata->vbus_enabled ? "enable" : "disable", error);
 400 }
 401
 402 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 403                                   bool enabled)
 404 {
 405         struct cpcap_charger_ddata *ddata =
 406                 container_of(comparator, struct cpcap_charger_ddata,
 407                              comparator);
 408
 409         ddata->vbus_enabled = enabled;
 410         schedule_delayed_work(&ddata->vbus_work, 0);
 411
 412         return 0;
 413 }
 414
 415 /* Charger interrupt handling functions */
 416
 417 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 418                                         struct cpcap_charger_ints_state *s)
 419 {
 420         int val, error;
 421
 422         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 423         if (error)
 424                 return error;
 425
 426         s->chrg_det = val & BIT(13);
 427         s->rvrs_chrg = val & BIT(12);
 428         s->vbusov = val & BIT(11);
 429
 430         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 431         if (error)
 432                 return error;
 433
 434         s->chrg_se1b = val & BIT(13);
 435         s->rvrs_mode = val & BIT(6);
 436         s->chrgcurr2 = val & BIT(5);
 437         s->chrgcurr1 = val & BIT(4);
 438         s->vbusvld = val & BIT(3);
 439
 440         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 441         if (error)
 442                 return error;
 443
 444         s->battdetb = val & BIT(6);
 445
 446         return 0;
 447 }
 448
 449 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 450                                        int state)
 451 {
 452         const char *status;
 453
 454         if (state > CPCAP_CHARGER_DONE) {
 455                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 456
 457                 return;
 458         }
 459
 460         ddata->state = state;
 461
 462         switch (state) {
 463         case CPCAP_CHARGER_DISCONNECTED:
 464                 status = "DISCONNECTED";
 465                 break;
 466         case CPCAP_CHARGER_DETECTING:
 467                 status = "DETECTING";
 468                 break;
 469         case CPCAP_CHARGER_CHARGING:
 470                 status = "CHARGING";
 471                 break;
 472         case CPCAP_CHARGER_DONE:
 473                 status = "DONE";
 474                 break;
 475         default:
 476                 return;
 477         }
 478
 479         dev_dbg(ddata->dev, "state: %s\n", status);
 480 }
 481
 482 int cpcap_charger_voltage_to_regval(int voltage)
 483 {
 484         int offset;
 485
 486         switch (voltage) {
 487         case 0 ... 4100000 - 1:
 488                 return 0;
 489         case 4100000 ... 4200000 - 1:
 490                 offset = 1;
 491                 break;
 492         case 4200000 ... 4300000 - 1:
 493                 offset = 0;
 494                 break;
 495         case 4300000 ... 4380000 - 1:
 496                 offset = -1;
 497                 break;
 498         case 4380000 ... 4440000:
 499                 offset = -2;
 500                 break;
 501         default:
 502                 return 0;
 503         }
 504
 505         return ((voltage - 4100000) / 20000) + offset;
 506 }
 507
 508 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 509                                      int state, unsigned long delay)
 510 {
 511         int error;
 512
 513         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 514         if (error)
 515                 return;
 516
 517         cpcap_charger_update_state(ddata, state);
 518         power_supply_changed(ddata->usb);
 519         schedule_delayed_work(&ddata->detect_work, delay);
 520 }
 521
 522 static void cpcap_usb_detect(struct work_struct *work)
 523 {
 524         struct cpcap_charger_ddata *ddata;
 525         struct cpcap_charger_ints_state s;
 526         int error;
 527
 528         ddata = container_of(work, struct cpcap_charger_ddata,
 529                              detect_work.work);
 530
 531         error = cpcap_charger_get_ints_state(ddata, &s);
 532         if (error)
 533                 return;
 534
 535         /* Just init the state if a charger is connected with no chrg_det set */
 536         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 537                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING);
 538
 539                 return;
 540         }
 541
 542         /*
 543          * If battery voltage is higher than charge voltage, it may have been
 544          * charged to 4.35V by Android. Try again in 10 minutes.
 545          */
 546         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 547                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 548                                          HZ * 60 * 10);
 549
 550                 return;
 551         }
 552
 553         /* Throttle chrgcurr2 interrupt for charger done and retry */
 554         switch (ddata->state) {
 555         case CPCAP_CHARGER_CHARGING:
 556                 if (s.chrgcurr2)
 557                         break;
 558                 if (s.chrgcurr1 && s.vbusvld) {
 559                         cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE,
 560                                                  HZ * 5);
 561                         return;
 562                 }
 563                 break;
 564         case CPCAP_CHARGER_DONE:
 565                 if (!s.chrgcurr2)
 566                         break;
 567                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 568                                          HZ * 5);
 569                 return;
 570         default:
 571                 break;
 572         }
 573
 574         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 575             s.chrgcurr1) {
 576                 int max_current;
 577                 int vchrg;
 578
 579                 if (cpcap_charger_battery_found(ddata))
 580                         max_current = CPCAP_REG_CRM_ICHRG_1A596;
 581                 else
 582                         max_current = CPCAP_REG_CRM_ICHRG_0A532;
 583
 584                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 585                 error = cpcap_charger_set_state(ddata,
 586                                                 CPCAP_REG_CRM_VCHRG(vchrg),
 587                                                 max_current, 0);
 588                 if (error)
 589                         goto out_err;
 590                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING);
 591         } else {
 592                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 593                 if (error)
 594                         goto out_err;
 595                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED);
 596         }
 597
 598         power_supply_changed(ddata->usb);
 599         return;
 600
 601 out_err:
 602         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 603 }
 604
 605 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 606 {
 607         struct cpcap_charger_ddata *ddata = data;
 608
 609         if (!atomic_read(&ddata->active))
 610                 return IRQ_NONE;
 611
 612         schedule_delayed_work(&ddata->detect_work, 0);
 613
 614         return IRQ_HANDLED;
 615 }
 616
 617 static int cpcap_usb_init_irq(struct platform_device *pdev,
 618                               struct cpcap_charger_ddata *ddata,
 619                               const char *name)
 620 {
 621         struct cpcap_interrupt_desc *d;
 622         int irq, error;
 623
 624         irq = platform_get_irq_byname(pdev, name);
 625         if (irq < 0)
 626                 return -ENODEV;
 627
 628         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 629                                           cpcap_charger_irq_thread,
 630                                           IRQF_SHARED,
 631                                           name, ddata);
 632         if (error) {
 633                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 634                         name, error);
 635
 636                 return error;
 637         }
 638
 639         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 640         if (!d)
 641                 return -ENOMEM;
 642
 643         d->name = name;
 644         d->irq = irq;
 645         list_add(&d->node, &ddata->irq_list);
 646
 647         return 0;
 648 }
 649
 650 static const char * const cpcap_charger_irqs[] = {
 651         /* REG_INT_0 */
 652         "chrg_det", "rvrs_chrg",
 653
 654         /* REG_INT1 */
 655         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 656
 657         /* REG_INT_3 */
 658         "battdetb",
 659 };
 660
 661 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 662                                      struct cpcap_charger_ddata *ddata)
 663 {
 664         int i, error;
 665
 666         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 667                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 668                 if (error)
 669                         return error;
 670         }
 671
 672         return 0;
 673 }
 674
 675 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 676 {
 677         int i;
 678
 679         for (i = 0; i < 2; i++) {
 680                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 681                                                       i, GPIOD_OUT_HIGH);
 682                 if (IS_ERR(ddata->gpio[i])) {
 683                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 684                                  i, PTR_ERR(ddata->gpio[i]));
 685                         ddata->gpio[i] = NULL;
 686                 }
 687         }
 688 }
 689
 690 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 691 {
 692         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 693                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 694         };
 695         int error, i;
 696
 697         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 698                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 699                                                           names[i]);
 700                 if (IS_ERR(ddata->channels[i])) {
 701                         error = PTR_ERR(ddata->channels[i]);
 702                         goto out_err;
 703                 }
 704
 705                 if (!ddata->channels[i]->indio_dev) {
 706                         error = -ENXIO;
 707                         goto out_err;
 708                 }
 709         }
 710
 711         return 0;
 712
 713 out_err:
 714         if (error != -EPROBE_DEFER)
 715                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 716                         error);
 717
 718         return error;
 719 }
 720
 721 static const struct power_supply_desc cpcap_charger_usb_desc = {
 722         .name           = "usb",
 723         .type           = POWER_SUPPLY_TYPE_USB,
 724         .properties     = cpcap_charger_props,
 725         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 726         .get_property   = cpcap_charger_get_property,
 727 };
 728
 729 #ifdef CONFIG_OF
 730 static const struct of_device_id cpcap_charger_id_table[] = {
 731         {
 732                 .compatible = "motorola,mapphone-cpcap-charger",
 733         },
 734         {},
 735 };
 736 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 737 #endif
 738
 739 static int cpcap_charger_probe(struct platform_device *pdev)
 740 {
 741         struct cpcap_charger_ddata *ddata;
 742         const struct of_device_id *of_id;
 743         struct power_supply_config psy_cfg = {};
 744         int error;
 745
 746         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 747                                 &pdev->dev);
 748         if (!of_id)
 749                 return -EINVAL;
 750
 751         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 752         if (!ddata)
 753                 return -ENOMEM;
 754
 755         ddata->dev = &pdev->dev;
 756         ddata->voltage = 4200000;
 757
 758         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 759         if (!ddata->reg)
 760                 return -ENODEV;
 761
 762         INIT_LIST_HEAD(&ddata->irq_list);
 763         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 764         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 765         platform_set_drvdata(pdev, ddata);
 766
 767         error = cpcap_charger_init_iio(ddata);
 768         if (error)
 769                 return error;
 770
 771         atomic_set(&ddata->active, 1);
 772
 773         psy_cfg.of_node = pdev->dev.of_node;
 774         psy_cfg.drv_data = ddata;
 775
 776         ddata->usb = devm_power_supply_register(ddata->dev,
 777                                                 &cpcap_charger_usb_desc,
 778                                                 &psy_cfg);
 779         if (IS_ERR(ddata->usb)) {
 780                 error = PTR_ERR(ddata->usb);
 781                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 782                         error);
 783
 784                 return error;
 785         }
 786
 787         error = cpcap_usb_init_interrupts(pdev, ddata);
 788         if (error)
 789                 return error;
 790
 791         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 792         error = omap_usb2_set_comparator(&ddata->comparator);
 793         if (error == -ENODEV) {
 794                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 795                 return -EPROBE_DEFER;
 796         }
 797
 798         cpcap_charger_init_optional_gpios(ddata);
 799
 800         schedule_delayed_work(&ddata->detect_work, 0);
 801
 802         return 0;
 803 }
 804
 805 static int cpcap_charger_remove(struct platform_device *pdev)
 806 {
 807         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 808         int error;
 809
 810         atomic_set(&ddata->active, 0);
 811         error = omap_usb2_set_comparator(NULL);
 812         if (error)
 813                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 814                          error);
 815
 816         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 817         if (error)
 818                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 819                          error);
 820         cancel_delayed_work_sync(&ddata->vbus_work);
 821         cancel_delayed_work_sync(&ddata->detect_work);
 822
 823         return 0;
 824 }
 825
 826 static struct platform_driver cpcap_charger_driver = {
 827         .probe = cpcap_charger_probe,
 828         .driver = {
 829                 .name   = "cpcap-charger",
 830                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 831         },
 832         .remove = cpcap_charger_remove,
 833 };
 834 module_platform_driver(cpcap_charger_driver);
 835
 836 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 837 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 838 MODULE_LICENSE("GPL v2");
 839 MODULE_ALIAS("platform:cpcap-charger");