linux/drivers/power/supply/cpcap-charger.c
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   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
 119enum {
 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
 128struct 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
 147struct cpcap_interrupt_desc {
 148        int irq;
 149        struct list_head node;
 150        const char *name;
 151};
 152
 153struct 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
 166static 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
 173static 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
 189static 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
 205static 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
 221static 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
 255static 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
 264static 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
 273static 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
 314out_err:
 315        dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 316
 317        return error;
 318}
 319
 320static 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
 337static 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
 378out_err:
 379        dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 380                ddata->vbus_enabled ? "enable" : "disable", error);
 381}
 382
 383static 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
 398static 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
 429static 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        return;
 462
 463out_err:
 464        dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 465}
 466
 467static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 468{
 469        struct cpcap_charger_ddata *ddata = data;
 470
 471        if (!atomic_read(&ddata->active))
 472                return IRQ_NONE;
 473
 474        schedule_delayed_work(&ddata->detect_work, 0);
 475
 476        return IRQ_HANDLED;
 477}
 478
 479static int cpcap_usb_init_irq(struct platform_device *pdev,
 480                              struct cpcap_charger_ddata *ddata,
 481                              const char *name)
 482{
 483        struct cpcap_interrupt_desc *d;
 484        int irq, error;
 485
 486        irq = platform_get_irq_byname(pdev, name);
 487        if (!irq)
 488                return -ENODEV;
 489
 490        error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 491                                          cpcap_charger_irq_thread,
 492                                          IRQF_SHARED,
 493                                          name, ddata);
 494        if (error) {
 495                dev_err(ddata->dev, "could not get irq %s: %i\n",
 496                        name, error);
 497
 498                return error;
 499        }
 500
 501        d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 502        if (!d)
 503                return -ENOMEM;
 504
 505        d->name = name;
 506        d->irq = irq;
 507        list_add(&d->node, &ddata->irq_list);
 508
 509        return 0;
 510}
 511
 512static const char * const cpcap_charger_irqs[] = {
 513        /* REG_INT_0 */
 514        "chrg_det", "rvrs_chrg",
 515
 516        /* REG_INT1 */
 517        "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr1", "vbusvld",
 518
 519        /* REG_INT_3 */
 520        "battdetb",
 521};
 522
 523static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 524                                     struct cpcap_charger_ddata *ddata)
 525{
 526        int i, error;
 527
 528        for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 529                error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 530                if (error)
 531                        return error;
 532        }
 533
 534        return 0;
 535}
 536
 537static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 538{
 539        int i;
 540
 541        for (i = 0; i < 2; i++) {
 542                ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 543                                                      i, GPIOD_OUT_HIGH);
 544                if (IS_ERR(ddata->gpio[i])) {
 545                        dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 546                                 i, PTR_ERR(ddata->gpio[i]));
 547                                 ddata->gpio[i] = NULL;
 548                }
 549        }
 550}
 551
 552static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 553{
 554        const char * const names[CPCAP_CHARGER_IIO_NR] = {
 555                "battdetb", "battp", "vbus", "chg_isense", "batti",
 556        };
 557        int error, i;
 558
 559        for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 560                ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 561                                                          names[i]);
 562                if (IS_ERR(ddata->channels[i])) {
 563                        error = PTR_ERR(ddata->channels[i]);
 564                        goto out_err;
 565                }
 566
 567                if (!ddata->channels[i]->indio_dev) {
 568                        error = -ENXIO;
 569                        goto out_err;
 570                }
 571        }
 572
 573        return 0;
 574
 575out_err:
 576        dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 577                error);
 578
 579        return error;
 580}
 581
 582static const struct power_supply_desc cpcap_charger_usb_desc = {
 583        .name           = "usb",
 584        .type           = POWER_SUPPLY_TYPE_USB,
 585        .properties     = cpcap_charger_props,
 586        .num_properties = ARRAY_SIZE(cpcap_charger_props),
 587        .get_property   = cpcap_charger_get_property,
 588};
 589
 590#ifdef CONFIG_OF
 591static const struct of_device_id cpcap_charger_id_table[] = {
 592        {
 593                .compatible = "motorola,mapphone-cpcap-charger",
 594        },
 595        {},
 596};
 597MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 598#endif
 599
 600static int cpcap_charger_probe(struct platform_device *pdev)
 601{
 602        struct cpcap_charger_ddata *ddata;
 603        const struct of_device_id *of_id;
 604        struct power_supply_config psy_cfg = {};
 605        int error;
 606
 607        of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 608                                &pdev->dev);
 609        if (!of_id)
 610                return -EINVAL;
 611
 612        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 613        if (!ddata)
 614                return -ENOMEM;
 615
 616        ddata->dev = &pdev->dev;
 617
 618        ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 619        if (!ddata->reg)
 620                return -ENODEV;
 621
 622        INIT_LIST_HEAD(&ddata->irq_list);
 623        INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 624        INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 625        platform_set_drvdata(pdev, ddata);
 626
 627        error = cpcap_charger_init_iio(ddata);
 628        if (error)
 629                return error;
 630
 631        atomic_set(&ddata->active, 1);
 632
 633        psy_cfg.of_node = pdev->dev.of_node;
 634        psy_cfg.drv_data = ddata;
 635
 636        ddata->usb = devm_power_supply_register(ddata->dev,
 637                                                &cpcap_charger_usb_desc,
 638                                                &psy_cfg);
 639        if (IS_ERR(ddata->usb)) {
 640                error = PTR_ERR(ddata->usb);
 641                dev_err(ddata->dev, "failed to register USB charger: %i\n",
 642                        error);
 643
 644                return error;
 645        }
 646
 647        error = cpcap_usb_init_interrupts(pdev, ddata);
 648        if (error)
 649                return error;
 650
 651        ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 652        error = omap_usb2_set_comparator(&ddata->comparator);
 653        if (error == -ENODEV) {
 654                dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 655                return -EPROBE_DEFER;
 656        }
 657
 658        cpcap_charger_init_optional_gpios(ddata);
 659
 660        schedule_delayed_work(&ddata->detect_work, 0);
 661
 662        return 0;
 663}
 664
 665static int cpcap_charger_remove(struct platform_device *pdev)
 666{
 667        struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 668        int error;
 669
 670        atomic_set(&ddata->active, 0);
 671        error = omap_usb2_set_comparator(NULL);
 672        if (error)
 673                dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 674                         error);
 675
 676        error = cpcap_charger_set_state(ddata, 0, 0, 0);
 677        if (error)
 678                dev_warn(ddata->dev, "could not clear charger: %i\n",
 679                         error);
 680        cancel_delayed_work_sync(&ddata->vbus_work);
 681        cancel_delayed_work_sync(&ddata->detect_work);
 682
 683        return 0;
 684}
 685
 686static struct platform_driver cpcap_charger_driver = {
 687        .probe = cpcap_charger_probe,
 688        .driver = {
 689                .name   = "cpcap-charger",
 690                .of_match_table = of_match_ptr(cpcap_charger_id_table),
 691        },
 692        .remove = cpcap_charger_remove,
 693};
 694module_platform_driver(cpcap_charger_driver);
 695
 696MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 697MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 698MODULE_LICENSE("GPL v2");
 699MODULE_ALIAS("platform:cpcap-charger");
 700