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 enum {
 112         CPCAP_CHARGER_IIO_BATTDET,
 113         CPCAP_CHARGER_IIO_VOLTAGE,
 114         CPCAP_CHARGER_IIO_VBUS,
 115         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 116         CPCAP_CHARGER_IIO_BATT_CURRENT,
 117         CPCAP_CHARGER_IIO_NR,
 118 };
 119
 120 struct cpcap_charger_ddata {
 121         struct device *dev;
 122         struct regmap *reg;
 123         struct list_head irq_list;
 124         struct delayed_work detect_work;
 125         struct delayed_work vbus_work;
 126         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 127
 128         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 129
 130         struct power_supply *usb;
 131
 132         struct phy_companion comparator;        /* For USB VBUS */
 133         bool vbus_enabled;
 134         atomic_t active;
 135
 136         int status;
 137 };
 138
 139 struct cpcap_interrupt_desc {
 140         int irq;
 141         struct list_head node;
 142         const char *name;
 143 };
 144
 145 struct cpcap_charger_ints_state {
 146         bool chrg_det;
 147         bool rvrs_chrg;
 148         bool vbusov;
 149
 150         bool chrg_se1b;
 151         bool rvrs_mode;
 152         bool chrgcurr1;
 153         bool vbusvld;
 154
 155         bool battdetb;
 156 };
 157
 158 static enum power_supply_property cpcap_charger_props[] = {
 159         POWER_SUPPLY_PROP_STATUS,
 160         POWER_SUPPLY_PROP_ONLINE,
 161         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 162         POWER_SUPPLY_PROP_CURRENT_NOW,
 163 };
 164
 165 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 166 {
 167         struct iio_channel *channel;
 168         int error, value;
 169
 170         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 171         error = iio_read_channel_raw(channel, &value);
 172         if (error < 0) {
 173                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 174
 175                 return false;
 176         }
 177
 178         return value == 1;
 179 }
 180
 181 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 182 {
 183         struct iio_channel *channel;
 184         int error, value = 0;
 185
 186         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 187         error = iio_read_channel_processed(channel, &value);
 188         if (error < 0) {
 189                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 190
 191                 return 0;
 192         }
 193
 194         return value;
 195 }
 196
 197 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 198 {
 199         struct iio_channel *channel;
 200         int error, value = 0;
 201
 202         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 203         error = iio_read_channel_processed(channel, &value);
 204         if (error < 0) {
 205                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 206
 207                 return 0;
 208         }
 209
 210         return value;
 211 }
 212
 213 static int cpcap_charger_get_property(struct power_supply *psy,
 214                                       enum power_supply_property psp,
 215                                       union power_supply_propval *val)
 216 {
 217         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 218
 219         switch (psp) {
 220         case POWER_SUPPLY_PROP_STATUS:
 221                 val->intval = ddata->status;
 222                 break;
 223         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 224                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 225                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 226                                 1000;
 227                 else
 228                         val->intval = 0;
 229                 break;
 230         case POWER_SUPPLY_PROP_CURRENT_NOW:
 231                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 232                         val->intval = cpcap_charger_get_charge_current(ddata) *
 233                                 1000;
 234                 else
 235                         val->intval = 0;
 236                 break;
 237         case POWER_SUPPLY_PROP_ONLINE:
 238                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 239                 break;
 240         default:
 241                 return -EINVAL;
 242         }
 243
 244         return 0;
 245 }
 246
 247 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 248                                          bool enabled)
 249 {
 250         if (!ddata->gpio[0])
 251                 return;
 252
 253         gpiod_set_value(ddata->gpio[0], enabled);
 254 }
 255
 256 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 257                                              bool enabled)
 258 {
 259         if (!ddata->gpio[1])
 260                 return;
 261
 262         gpiod_set_value(ddata->gpio[1], enabled);
 263 }
 264
 265 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 266                                    int max_voltage, int charge_current,
 267                                    int trickle_current)
 268 {
 269         bool enable;
 270         int error;
 271
 272         enable = (charge_current || trickle_current);
 273         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 274
 275         if (!enable) {
 276                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 277                                            0x3fff,
 278                                            CPCAP_REG_CRM_FET_OVRD |
 279                                            CPCAP_REG_CRM_FET_CTRL);
 280                 if (error) {
 281                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 282                         goto out_err;
 283                 }
 284
 285                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 286
 287                 return 0;
 288         }
 289
 290         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 291                                    CPCAP_REG_CRM_CHRG_LED_EN |
 292                                    trickle_current |
 293                                    CPCAP_REG_CRM_FET_OVRD |
 294                                    CPCAP_REG_CRM_FET_CTRL |
 295                                    max_voltage |
 296                                    charge_current);
 297         if (error) {
 298                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 299                 goto out_err;
 300         }
 301
 302         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 303
 304         return 0;
 305
 306 out_err:
 307         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 308
 309         return error;
 310 }
 311
 312 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 313 {
 314         int error, value = 0;
 315         struct iio_channel *channel =
 316                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 317
 318         error = iio_read_channel_processed(channel, &value);
 319         if (error >= 0)
 320                 return value > 3900 ? true : false;
 321
 322         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 323
 324         return false;
 325 }
 326
 327 /* VBUS control functions for the USB PHY companion */
 328
 329 static void cpcap_charger_vbus_work(struct work_struct *work)
 330 {
 331         struct cpcap_charger_ddata *ddata;
 332         bool vbus = false;
 333         int error;
 334
 335         ddata = container_of(work, struct cpcap_charger_ddata,
 336                              vbus_work.work);
 337
 338         if (ddata->vbus_enabled) {
 339                 vbus = cpcap_charger_vbus_valid(ddata);
 340                 if (vbus) {
 341                         dev_info(ddata->dev, "VBUS already provided\n");
 342
 343                         return;
 344                 }
 345
 346                 cpcap_charger_set_cable_path(ddata, false);
 347                 cpcap_charger_set_inductive_path(ddata, false);
 348
 349                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 350                 if (error)
 351                         goto out_err;
 352
 353                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 354                                            CPCAP_REG_CRM_RVRSMODE,
 355                                            CPCAP_REG_CRM_RVRSMODE);
 356                 if (error)
 357                         goto out_err;
 358         } else {
 359                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 360                                            CPCAP_REG_CRM_RVRSMODE, 0);
 361                 if (error)
 362                         goto out_err;
 363
 364                 cpcap_charger_set_cable_path(ddata, true);
 365                 cpcap_charger_set_inductive_path(ddata, true);
 366         }
 367
 368         return;
 369
 370 out_err:
 371         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 372                 ddata->vbus_enabled ? "enable" : "disable", error);
 373 }
 374
 375 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 376                                   bool enabled)
 377 {
 378         struct cpcap_charger_ddata *ddata =
 379                 container_of(comparator, struct cpcap_charger_ddata,
 380                              comparator);
 381
 382         ddata->vbus_enabled = enabled;
 383         schedule_delayed_work(&ddata->vbus_work, 0);
 384
 385         return 0;
 386 }
 387
 388 /* Charger interrupt handling functions */
 389
 390 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 391                                         struct cpcap_charger_ints_state *s)
 392 {
 393         int val, error;
 394
 395         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 396         if (error)
 397                 return error;
 398
 399         s->chrg_det = val & BIT(13);
 400         s->rvrs_chrg = val & BIT(12);
 401         s->vbusov = val & BIT(11);
 402
 403         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 404         if (error)
 405                 return error;
 406
 407         s->chrg_se1b = val & BIT(13);
 408         s->rvrs_mode = val & BIT(6);
 409         s->chrgcurr1 = val & BIT(4);
 410         s->vbusvld = val & BIT(3);
 411
 412         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 413         if (error)
 414                 return error;
 415
 416         s->battdetb = val & BIT(6);
 417
 418         return 0;
 419 }
 420
 421 static void cpcap_usb_detect(struct work_struct *work)
 422 {
 423         struct cpcap_charger_ddata *ddata;
 424         struct cpcap_charger_ints_state s;
 425         int error;
 426
 427         ddata = container_of(work, struct cpcap_charger_ddata,
 428                              detect_work.work);
 429
 430         error = cpcap_charger_get_ints_state(ddata, &s);
 431         if (error)
 432                 return;
 433
 434         if (cpcap_charger_vbus_valid(ddata) && s.chrgcurr1) {
 435                 int max_current;
 436
 437                 if (cpcap_charger_battery_found(ddata))
 438                         max_current = CPCAP_REG_CRM_ICHRG_1A596;
 439                 else
 440                         max_current = CPCAP_REG_CRM_ICHRG_0A532;
 441
 442                 error = cpcap_charger_set_state(ddata,
 443                                                 CPCAP_REG_CRM_VCHRG_4V35,
 444                                                 max_current, 0);
 445                 if (error)
 446                         goto out_err;
 447         } else {
 448                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 449                 if (error)
 450                         goto out_err;
 451         }
 452
 453         power_supply_changed(ddata->usb);
 454         return;
 455
 456 out_err:
 457         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 458 }
 459
 460 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 461 {
 462         struct cpcap_charger_ddata *ddata = data;
 463
 464         if (!atomic_read(&ddata->active))
 465                 return IRQ_NONE;
 466
 467         schedule_delayed_work(&ddata->detect_work, 0);
 468
 469         return IRQ_HANDLED;
 470 }
 471
 472 static int cpcap_usb_init_irq(struct platform_device *pdev,
 473                               struct cpcap_charger_ddata *ddata,
 474                               const char *name)
 475 {
 476         struct cpcap_interrupt_desc *d;
 477         int irq, error;
 478
 479         irq = platform_get_irq_byname(pdev, name);
 480         if (irq < 0)
 481                 return -ENODEV;
 482
 483         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 484                                           cpcap_charger_irq_thread,
 485                                           IRQF_SHARED,
 486                                           name, ddata);
 487         if (error) {
 488                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 489                         name, error);
 490
 491                 return error;
 492         }
 493
 494         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 495         if (!d)
 496                 return -ENOMEM;
 497
 498         d->name = name;
 499         d->irq = irq;
 500         list_add(&d->node, &ddata->irq_list);
 501
 502         return 0;
 503 }
 504
 505 static const char * const cpcap_charger_irqs[] = {
 506         /* REG_INT_0 */
 507         "chrg_det", "rvrs_chrg",
 508
 509         /* REG_INT1 */
 510         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr1", "vbusvld",
 511
 512         /* REG_INT_3 */
 513         "battdetb",
 514 };
 515
 516 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 517                                      struct cpcap_charger_ddata *ddata)
 518 {
 519         int i, error;
 520
 521         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 522                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 523                 if (error)
 524                         return error;
 525         }
 526
 527         return 0;
 528 }
 529
 530 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 531 {
 532         int i;
 533
 534         for (i = 0; i < 2; i++) {
 535                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 536                                                       i, GPIOD_OUT_HIGH);
 537                 if (IS_ERR(ddata->gpio[i])) {
 538                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 539                                  i, PTR_ERR(ddata->gpio[i]));
 540                         ddata->gpio[i] = NULL;
 541                 }
 542         }
 543 }
 544
 545 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 546 {
 547         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 548                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 549         };
 550         int error, i;
 551
 552         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 553                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 554                                                           names[i]);
 555                 if (IS_ERR(ddata->channels[i])) {
 556                         error = PTR_ERR(ddata->channels[i]);
 557                         goto out_err;
 558                 }
 559
 560                 if (!ddata->channels[i]->indio_dev) {
 561                         error = -ENXIO;
 562                         goto out_err;
 563                 }
 564         }
 565
 566         return 0;
 567
 568 out_err:
 569         if (error != -EPROBE_DEFER)
 570                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 571                         error);
 572
 573         return error;
 574 }
 575
 576 static const struct power_supply_desc cpcap_charger_usb_desc = {
 577         .name           = "usb",
 578         .type           = POWER_SUPPLY_TYPE_USB,
 579         .properties     = cpcap_charger_props,
 580         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 581         .get_property   = cpcap_charger_get_property,
 582 };
 583
 584 #ifdef CONFIG_OF
 585 static const struct of_device_id cpcap_charger_id_table[] = {
 586         {
 587                 .compatible = "motorola,mapphone-cpcap-charger",
 588         },
 589         {},
 590 };
 591 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 592 #endif
 593
 594 static int cpcap_charger_probe(struct platform_device *pdev)
 595 {
 596         struct cpcap_charger_ddata *ddata;
 597         const struct of_device_id *of_id;
 598         struct power_supply_config psy_cfg = {};
 599         int error;
 600
 601         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 602                                 &pdev->dev);
 603         if (!of_id)
 604                 return -EINVAL;
 605
 606         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 607         if (!ddata)
 608                 return -ENOMEM;
 609
 610         ddata->dev = &pdev->dev;
 611
 612         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 613         if (!ddata->reg)
 614                 return -ENODEV;
 615
 616         INIT_LIST_HEAD(&ddata->irq_list);
 617         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 618         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 619         platform_set_drvdata(pdev, ddata);
 620
 621         error = cpcap_charger_init_iio(ddata);
 622         if (error)
 623                 return error;
 624
 625         atomic_set(&ddata->active, 1);
 626
 627         psy_cfg.of_node = pdev->dev.of_node;
 628         psy_cfg.drv_data = ddata;
 629
 630         ddata->usb = devm_power_supply_register(ddata->dev,
 631                                                 &cpcap_charger_usb_desc,
 632                                                 &psy_cfg);
 633         if (IS_ERR(ddata->usb)) {
 634                 error = PTR_ERR(ddata->usb);
 635                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 636                         error);
 637
 638                 return error;
 639         }
 640
 641         error = cpcap_usb_init_interrupts(pdev, ddata);
 642         if (error)
 643                 return error;
 644
 645         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 646         error = omap_usb2_set_comparator(&ddata->comparator);
 647         if (error == -ENODEV) {
 648                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 649                 return -EPROBE_DEFER;
 650         }
 651
 652         cpcap_charger_init_optional_gpios(ddata);
 653
 654         schedule_delayed_work(&ddata->detect_work, 0);
 655
 656         return 0;
 657 }
 658
 659 static int cpcap_charger_remove(struct platform_device *pdev)
 660 {
 661         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 662         int error;
 663
 664         atomic_set(&ddata->active, 0);
 665         error = omap_usb2_set_comparator(NULL);
 666         if (error)
 667                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 668                          error);
 669
 670         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 671         if (error)
 672                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 673                          error);
 674         cancel_delayed_work_sync(&ddata->vbus_work);
 675         cancel_delayed_work_sync(&ddata->detect_work);
 676
 677         return 0;
 678 }
 679
 680 static struct platform_driver cpcap_charger_driver = {
 681         .probe = cpcap_charger_probe,
 682         .driver = {
 683                 .name   = "cpcap-charger",
 684                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 685         },
 686         .remove = cpcap_charger_remove,
 687 };
 688 module_platform_driver(cpcap_charger_driver);
 689
 690 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 691 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 692 MODULE_LICENSE("GPL v2");
 693 MODULE_ALIAS("platform:cpcap-charger");