drivers/power/supply/cpcap-charger.c

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