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 /* CPCAP_REG_CRM register bits */
  42 #define CPCAP_REG_CRM_UNUSED_641_15     BIT(15) /* 641 = register number */
  43 #define CPCAP_REG_CRM_UNUSED_641_14     BIT(14) /* 641 = register number */
  44 #define CPCAP_REG_CRM_CHRG_LED_EN       BIT(13)
  45 #define CPCAP_REG_CRM_RVRSMODE          BIT(12)
  46 #define CPCAP_REG_CRM_ICHRG_TR1         BIT(11)
  47 #define CPCAP_REG_CRM_ICHRG_TR0         BIT(10)
  48 #define CPCAP_REG_CRM_FET_OVRD          BIT(9)
  49 #define CPCAP_REG_CRM_FET_CTRL          BIT(8)
  50 #define CPCAP_REG_CRM_VCHRG3            BIT(7)
  51 #define CPCAP_REG_CRM_VCHRG2            BIT(6)
  52 #define CPCAP_REG_CRM_VCHRG1            BIT(5)
  53 #define CPCAP_REG_CRM_VCHRG0            BIT(4)
  54 #define CPCAP_REG_CRM_ICHRG3            BIT(3)
  55 #define CPCAP_REG_CRM_ICHRG2            BIT(2)
  56 #define CPCAP_REG_CRM_ICHRG1            BIT(1)
  57 #define CPCAP_REG_CRM_ICHRG0            BIT(0)
  58
  59 /* CPCAP_REG_CRM trickle charge voltages */
  60 #define CPCAP_REG_CRM_TR(val)           (((val) & 0x3) << 10)
  61 #define CPCAP_REG_CRM_TR_0A00           CPCAP_REG_CRM_TR(0x0)
  62 #define CPCAP_REG_CRM_TR_0A24           CPCAP_REG_CRM_TR(0x1)
  63 #define CPCAP_REG_CRM_TR_0A48           CPCAP_REG_CRM_TR(0x2)
  64 #define CPCAP_REG_CRM_TR_0A72           CPCAP_REG_CRM_TR(0x4)
  65
  66 /* CPCAP_REG_CRM charge voltages */
  67 #define CPCAP_REG_CRM_VCHRG(val)        (((val) & 0xf) << 4)
  68 #define CPCAP_REG_CRM_VCHRG_3V80        CPCAP_REG_CRM_VCHRG(0x0)
  69 #define CPCAP_REG_CRM_VCHRG_4V10        CPCAP_REG_CRM_VCHRG(0x1)
  70 #define CPCAP_REG_CRM_VCHRG_4V15        CPCAP_REG_CRM_VCHRG(0x2)
  71 #define CPCAP_REG_CRM_VCHRG_4V20        CPCAP_REG_CRM_VCHRG(0x3)
  72 #define CPCAP_REG_CRM_VCHRG_4V22        CPCAP_REG_CRM_VCHRG(0x4)
  73 #define CPCAP_REG_CRM_VCHRG_4V24        CPCAP_REG_CRM_VCHRG(0x5)
  74 #define CPCAP_REG_CRM_VCHRG_4V26        CPCAP_REG_CRM_VCHRG(0x6)
  75 #define CPCAP_REG_CRM_VCHRG_4V28        CPCAP_REG_CRM_VCHRG(0x7)
  76 #define CPCAP_REG_CRM_VCHRG_4V30        CPCAP_REG_CRM_VCHRG(0x8)
  77 #define CPCAP_REG_CRM_VCHRG_4V32        CPCAP_REG_CRM_VCHRG(0x9)
  78 #define CPCAP_REG_CRM_VCHRG_4V34        CPCAP_REG_CRM_VCHRG(0xa)
  79 #define CPCAP_REG_CRM_VCHRG_4V35        CPCAP_REG_CRM_VCHRG(0xb)
  80 #define CPCAP_REG_CRM_VCHRG_4V38        CPCAP_REG_CRM_VCHRG(0xc)
  81 #define CPCAP_REG_CRM_VCHRG_4V40        CPCAP_REG_CRM_VCHRG(0xd)
  82 #define CPCAP_REG_CRM_VCHRG_4V42        CPCAP_REG_CRM_VCHRG(0xe)
  83 #define CPCAP_REG_CRM_VCHRG_4V44        CPCAP_REG_CRM_VCHRG(0xf)
  84
  85 /* CPCAP_REG_CRM charge currents */
  86 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  87 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  88 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  89 #define CPCAP_REG_CRM_ICHRG_0A176       CPCAP_REG_CRM_ICHRG(0x2)
  90 #define CPCAP_REG_CRM_ICHRG_0A264       CPCAP_REG_CRM_ICHRG(0x3)
  91 #define CPCAP_REG_CRM_ICHRG_0A352       CPCAP_REG_CRM_ICHRG(0x4)
  92 #define CPCAP_REG_CRM_ICHRG_0A440       CPCAP_REG_CRM_ICHRG(0x5)
  93 #define CPCAP_REG_CRM_ICHRG_0A528       CPCAP_REG_CRM_ICHRG(0x6)
  94 #define CPCAP_REG_CRM_ICHRG_0A616       CPCAP_REG_CRM_ICHRG(0x7)
  95 #define CPCAP_REG_CRM_ICHRG_0A704       CPCAP_REG_CRM_ICHRG(0x8)
  96 #define CPCAP_REG_CRM_ICHRG_0A792       CPCAP_REG_CRM_ICHRG(0x9)
  97 #define CPCAP_REG_CRM_ICHRG_0A880       CPCAP_REG_CRM_ICHRG(0xa)
  98 #define CPCAP_REG_CRM_ICHRG_0A968       CPCAP_REG_CRM_ICHRG(0xb)
  99 #define CPCAP_REG_CRM_ICHRG_1A056       CPCAP_REG_CRM_ICHRG(0xc)
 100 #define CPCAP_REG_CRM_ICHRG_1A144       CPCAP_REG_CRM_ICHRG(0xd)
 101 #define CPCAP_REG_CRM_ICHRG_1A584       CPCAP_REG_CRM_ICHRG(0xe)
 102 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 103
 104 enum {
 105         CPCAP_CHARGER_IIO_BATTDET,
 106         CPCAP_CHARGER_IIO_VOLTAGE,
 107         CPCAP_CHARGER_IIO_VBUS,
 108         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 109         CPCAP_CHARGER_IIO_BATT_CURRENT,
 110         CPCAP_CHARGER_IIO_NR,
 111 };
 112
 113 struct cpcap_charger_ddata {
 114         struct device *dev;
 115         struct regmap *reg;
 116         struct list_head irq_list;
 117         struct delayed_work detect_work;
 118         struct delayed_work vbus_work;
 119         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 120
 121         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 122
 123         struct power_supply *usb;
 124
 125         struct phy_companion comparator;        /* For USB VBUS */
 126         bool vbus_enabled;
 127         atomic_t active;
 128
 129         int status;
 130 };
 131
 132 struct cpcap_interrupt_desc {
 133         int irq;
 134         struct list_head node;
 135         const char *name;
 136 };
 137
 138 struct cpcap_charger_ints_state {
 139         bool chrg_det;
 140         bool rvrs_chrg;
 141         bool vbusov;
 142
 143         bool chrg_se1b;
 144         bool rvrs_mode;
 145         bool chrgcurr1;
 146         bool vbusvld;
 147
 148         bool battdetb;
 149 };
 150
 151 static enum power_supply_property cpcap_charger_props[] = {
 152         POWER_SUPPLY_PROP_STATUS,
 153         POWER_SUPPLY_PROP_ONLINE,
 154         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 155         POWER_SUPPLY_PROP_CURRENT_NOW,
 156 };
 157
 158 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 159 {
 160         struct iio_channel *channel;
 161         int error, value;
 162
 163         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 164         error = iio_read_channel_raw(channel, &value);
 165         if (error < 0) {
 166                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 167
 168                 return false;
 169         }
 170
 171         return value == 1;
 172 }
 173
 174 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 175 {
 176         struct iio_channel *channel;
 177         int error, value = 0;
 178
 179         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 180         error = iio_read_channel_processed(channel, &value);
 181         if (error < 0) {
 182                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 183
 184                 return 0;
 185         }
 186
 187         return value;
 188 }
 189
 190 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 191 {
 192         struct iio_channel *channel;
 193         int error, value = 0;
 194
 195         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 196         error = iio_read_channel_processed(channel, &value);
 197         if (error < 0) {
 198                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 199
 200                 return 0;
 201         }
 202
 203         return value;
 204 }
 205
 206 static int cpcap_charger_get_property(struct power_supply *psy,
 207                                       enum power_supply_property psp,
 208                                       union power_supply_propval *val)
 209 {
 210         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 211
 212         switch (psp) {
 213         case POWER_SUPPLY_PROP_STATUS:
 214                 val->intval = ddata->status;
 215                 break;
 216         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 217                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 218                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 219                                 1000;
 220                 else
 221                         val->intval = 0;
 222                 break;
 223         case POWER_SUPPLY_PROP_CURRENT_NOW:
 224                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 225                         val->intval = cpcap_charger_get_charge_current(ddata) *
 226                                 1000;
 227                 else
 228                         val->intval = 0;
 229                 break;
 230         case POWER_SUPPLY_PROP_ONLINE:
 231                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 232                 break;
 233         default:
 234                 return -EINVAL;
 235         }
 236
 237         return 0;
 238 }
 239
 240 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 241                                          bool enabled)
 242 {
 243         if (!ddata->gpio[0])
 244                 return;
 245
 246         gpiod_set_value(ddata->gpio[0], enabled);
 247 }
 248
 249 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 250                                              bool enabled)
 251 {
 252         if (!ddata->gpio[1])
 253                 return;
 254
 255         gpiod_set_value(ddata->gpio[1], enabled);
 256 }
 257
 258 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 259                                    int max_voltage, int charge_current,
 260                                    int trickle_current)
 261 {
 262         bool enable;
 263         int error;
 264
 265         enable = (charge_current || trickle_current);
 266         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 267
 268         if (!enable) {
 269                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 270                                            0x3fff,
 271                                            CPCAP_REG_CRM_FET_OVRD |
 272                                            CPCAP_REG_CRM_FET_CTRL);
 273                 if (error) {
 274                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 275                         goto out_err;
 276                 }
 277
 278                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 279
 280                 return 0;
 281         }
 282
 283         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 284                                    CPCAP_REG_CRM_CHRG_LED_EN |
 285                                    trickle_current |
 286                                    CPCAP_REG_CRM_FET_OVRD |
 287                                    CPCAP_REG_CRM_FET_CTRL |
 288                                    max_voltage |
 289                                    charge_current);
 290         if (error) {
 291                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 292                 goto out_err;
 293         }
 294
 295         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 296
 297         return 0;
 298
 299 out_err:
 300         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 301
 302         return error;
 303 }
 304
 305 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 306 {
 307         int error, value = 0;
 308         struct iio_channel *channel =
 309                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 310
 311         error = iio_read_channel_processed(channel, &value);
 312         if (error >= 0)
 313                 return value > 3900 ? true : false;
 314
 315         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 316
 317         return false;
 318 }
 319
 320 /* VBUS control functions for the USB PHY companion */
 321
 322 static void cpcap_charger_vbus_work(struct work_struct *work)
 323 {
 324         struct cpcap_charger_ddata *ddata;
 325         bool vbus = false;
 326         int error;
 327
 328         ddata = container_of(work, struct cpcap_charger_ddata,
 329                              vbus_work.work);
 330
 331         if (ddata->vbus_enabled) {
 332                 vbus = cpcap_charger_vbus_valid(ddata);
 333                 if (vbus) {
 334                         dev_info(ddata->dev, "VBUS already provided\n");
 335
 336                         return;
 337                 }
 338
 339                 cpcap_charger_set_cable_path(ddata, false);
 340                 cpcap_charger_set_inductive_path(ddata, false);
 341
 342                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 343                 if (error)
 344                         goto out_err;
 345
 346                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 347                                            CPCAP_REG_CRM_RVRSMODE,
 348                                            CPCAP_REG_CRM_RVRSMODE);
 349                 if (error)
 350                         goto out_err;
 351         } else {
 352                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 353                                            CPCAP_REG_CRM_RVRSMODE, 0);
 354                 if (error)
 355                         goto out_err;
 356
 357                 cpcap_charger_set_cable_path(ddata, true);
 358                 cpcap_charger_set_inductive_path(ddata, true);
 359         }
 360
 361         return;
 362
 363 out_err:
 364         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 365                 ddata->vbus_enabled ? "enable" : "disable", error);
 366 }
 367
 368 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 369                                   bool enabled)
 370 {
 371         struct cpcap_charger_ddata *ddata =
 372                 container_of(comparator, struct cpcap_charger_ddata,
 373                              comparator);
 374
 375         ddata->vbus_enabled = enabled;
 376         schedule_delayed_work(&ddata->vbus_work, 0);
 377
 378         return 0;
 379 }
 380
 381 /* Charger interrupt handling functions */
 382
 383 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 384                                         struct cpcap_charger_ints_state *s)
 385 {
 386         int val, error;
 387
 388         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 389         if (error)
 390                 return error;
 391
 392         s->chrg_det = val & BIT(13);
 393         s->rvrs_chrg = val & BIT(12);
 394         s->vbusov = val & BIT(11);
 395
 396         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 397         if (error)
 398                 return error;
 399
 400         s->chrg_se1b = val & BIT(13);
 401         s->rvrs_mode = val & BIT(6);
 402         s->chrgcurr1 = val & BIT(4);
 403         s->vbusvld = val & BIT(3);
 404
 405         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 406         if (error)
 407                 return error;
 408
 409         s->battdetb = val & BIT(6);
 410
 411         return 0;
 412 }
 413
 414 static void cpcap_usb_detect(struct work_struct *work)
 415 {
 416         struct cpcap_charger_ddata *ddata;
 417         struct cpcap_charger_ints_state s;
 418         int error;
 419
 420         ddata = container_of(work, struct cpcap_charger_ddata,
 421                              detect_work.work);
 422
 423         error = cpcap_charger_get_ints_state(ddata, &s);
 424         if (error)
 425                 return;
 426
 427         if (cpcap_charger_vbus_valid(ddata) && s.chrgcurr1) {
 428                 int max_current;
 429
 430                 if (cpcap_charger_battery_found(ddata))
 431                         max_current = CPCAP_REG_CRM_ICHRG_1A584;
 432                 else
 433                         max_current = CPCAP_REG_CRM_ICHRG_0A528;
 434
 435                 error = cpcap_charger_set_state(ddata,
 436                                                 CPCAP_REG_CRM_VCHRG_4V35,
 437                                                 max_current, 0);
 438                 if (error)
 439                         goto out_err;
 440         } else {
 441                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 442                 if (error)
 443                         goto out_err;
 444         }
 445
 446         return;
 447
 448 out_err:
 449         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 450 }
 451
 452 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 453 {
 454         struct cpcap_charger_ddata *ddata = data;
 455
 456         if (!atomic_read(&ddata->active))
 457                 return IRQ_NONE;
 458
 459         schedule_delayed_work(&ddata->detect_work, 0);
 460
 461         return IRQ_HANDLED;
 462 }
 463
 464 static int cpcap_usb_init_irq(struct platform_device *pdev,
 465                               struct cpcap_charger_ddata *ddata,
 466                               const char *name)
 467 {
 468         struct cpcap_interrupt_desc *d;
 469         int irq, error;
 470
 471         irq = platform_get_irq_byname(pdev, name);
 472         if (!irq)
 473                 return -ENODEV;
 474
 475         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 476                                           cpcap_charger_irq_thread,
 477                                           IRQF_SHARED,
 478                                           name, ddata);
 479         if (error) {
 480                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 481                         name, error);
 482
 483                 return error;
 484         }
 485
 486         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 487         if (!d)
 488                 return -ENOMEM;
 489
 490         d->name = name;
 491         d->irq = irq;
 492         list_add(&d->node, &ddata->irq_list);
 493
 494         return 0;
 495 }
 496
 497 static const char * const cpcap_charger_irqs[] = {
 498         /* REG_INT_0 */
 499         "chrg_det", "rvrs_chrg",
 500
 501         /* REG_INT1 */
 502         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr1", "vbusvld",
 503
 504         /* REG_INT_3 */
 505         "battdetb",
 506 };
 507
 508 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 509                                      struct cpcap_charger_ddata *ddata)
 510 {
 511         int i, error;
 512
 513         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 514                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 515                 if (error)
 516                         return error;
 517         }
 518
 519         return 0;
 520 }
 521
 522 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 523 {
 524         int i;
 525
 526         for (i = 0; i < 2; i++) {
 527                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 528                                                       i, GPIOD_OUT_HIGH);
 529                 if (IS_ERR(ddata->gpio[i])) {
 530                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 531                                  i, PTR_ERR(ddata->gpio[i]));
 532                                  ddata->gpio[i] = NULL;
 533                 }
 534         }
 535 }
 536
 537 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 538 {
 539         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 540                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 541         };
 542         int error, i;
 543
 544         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 545                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 546                                                           names[i]);
 547                 if (IS_ERR(ddata->channels[i])) {
 548                         error = PTR_ERR(ddata->channels[i]);
 549                         goto out_err;
 550                 }
 551
 552                 if (!ddata->channels[i]->indio_dev) {
 553                         error = -ENXIO;
 554                         goto out_err;
 555                 }
 556         }
 557
 558         return 0;
 559
 560 out_err:
 561         dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 562                 error);
 563
 564         return error;
 565 }
 566
 567 static const struct power_supply_desc cpcap_charger_usb_desc = {
 568         .name           = "usb",
 569         .type           = POWER_SUPPLY_TYPE_USB,
 570         .properties     = cpcap_charger_props,
 571         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 572         .get_property   = cpcap_charger_get_property,
 573 };
 574
 575 #ifdef CONFIG_OF
 576 static const struct of_device_id cpcap_charger_id_table[] = {
 577         {
 578                 .compatible = "motorola,mapphone-cpcap-charger",
 579         },
 580         {},
 581 };
 582 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 583 #endif
 584
 585 static int cpcap_charger_probe(struct platform_device *pdev)
 586 {
 587         struct cpcap_charger_ddata *ddata;
 588         const struct of_device_id *of_id;
 589         int error;
 590
 591         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 592                                 &pdev->dev);
 593         if (!of_id)
 594                 return -EINVAL;
 595
 596         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 597         if (!ddata)
 598                 return -ENOMEM;
 599
 600         ddata->dev = &pdev->dev;
 601
 602         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 603         if (!ddata->reg)
 604                 return -ENODEV;
 605
 606         INIT_LIST_HEAD(&ddata->irq_list);
 607         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 608         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 609         platform_set_drvdata(pdev, ddata);
 610
 611         error = cpcap_charger_init_iio(ddata);
 612         if (error)
 613                 return error;
 614
 615         atomic_set(&ddata->active, 1);
 616
 617         ddata->usb = devm_power_supply_register(ddata->dev,
 618                                                 &cpcap_charger_usb_desc,
 619                                                 NULL);
 620         if (IS_ERR(ddata->usb)) {
 621                 error = PTR_ERR(ddata->usb);
 622                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 623                         error);
 624
 625                 return error;
 626         }
 627
 628         error = cpcap_usb_init_interrupts(pdev, ddata);
 629         if (error)
 630                 return error;
 631
 632         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 633         error = omap_usb2_set_comparator(&ddata->comparator);
 634         if (error == -ENODEV) {
 635                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 636                 return -EPROBE_DEFER;
 637         }
 638
 639         cpcap_charger_init_optional_gpios(ddata);
 640
 641         schedule_delayed_work(&ddata->detect_work, 0);
 642
 643         return 0;
 644 }
 645
 646 static int cpcap_charger_remove(struct platform_device *pdev)
 647 {
 648         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 649         int error;
 650
 651         atomic_set(&ddata->active, 0);
 652         error = omap_usb2_set_comparator(NULL);
 653         if (error)
 654                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 655                          error);
 656
 657         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 658         if (error)
 659                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 660                          error);
 661         cancel_delayed_work_sync(&ddata->vbus_work);
 662         cancel_delayed_work_sync(&ddata->detect_work);
 663
 664         return 0;
 665 }
 666
 667 static struct platform_driver cpcap_charger_driver = {
 668         .probe = cpcap_charger_probe,
 669         .driver = {
 670                 .name   = "cpcap-charger",
 671                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 672         },
 673         .remove = cpcap_charger_remove,
 674 };
 675 module_platform_driver(cpcap_charger_driver);
 676
 677 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 678 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 679 MODULE_LICENSE("GPL v2");
 680 MODULE_ALIAS("platform:cpcap-charger");