drivers/phy/motorola/phy-cpcap-usb.c

   1 /*
   2  * Motorola CPCAP PMIC USB PHY driver
   3  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
   4  *
   5  * Some parts based on earlier Motorola Linux kernel tree code in
   6  * board-mapphone-usb.c and cpcap-usb-det.c:
   7  * Copyright (C) 2007 - 2011 Motorola, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation version 2.
  12  *
  13  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  14  * kind, whether express or implied; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/atomic.h>
  20 #include <linux/clk.h>
  21 #include <linux/delay.h>
  22 #include <linux/err.h>
  23 #include <linux/io.h>
  24 #include <linux/module.h>
  25 #include <linux/of.h>
  26 #include <linux/of_platform.h>
  27 #include <linux/iio/consumer.h>
  28 #include <linux/pinctrl/consumer.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/regmap.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/gpio/consumer.h>
  34 #include <linux/mfd/motorola-cpcap.h>
  35 #include <linux/phy/omap_usb.h>
  36 #include <linux/phy/phy.h>
  37 #include <linux/regulator/consumer.h>
  38 #include <linux/usb/musb.h>
  39
  40 /* CPCAP_REG_USBC1 register bits */
  41 #define CPCAP_BIT_IDPULSE               BIT(15)
  42 #define CPCAP_BIT_ID100KPU              BIT(14)
  43 #define CPCAP_BIT_IDPUCNTRL             BIT(13)
  44 #define CPCAP_BIT_IDPU                  BIT(12)
  45 #define CPCAP_BIT_IDPD                  BIT(11)
  46 #define CPCAP_BIT_VBUSCHRGTMR3          BIT(10)
  47 #define CPCAP_BIT_VBUSCHRGTMR2          BIT(9)
  48 #define CPCAP_BIT_VBUSCHRGTMR1          BIT(8)
  49 #define CPCAP_BIT_VBUSCHRGTMR0          BIT(7)
  50 #define CPCAP_BIT_VBUSPU                BIT(6)
  51 #define CPCAP_BIT_VBUSPD                BIT(5)
  52 #define CPCAP_BIT_DMPD                  BIT(4)
  53 #define CPCAP_BIT_DPPD                  BIT(3)
  54 #define CPCAP_BIT_DM1K5PU               BIT(2)
  55 #define CPCAP_BIT_DP1K5PU               BIT(1)
  56 #define CPCAP_BIT_DP150KPU              BIT(0)
  57
  58 /* CPCAP_REG_USBC2 register bits */
  59 #define CPCAP_BIT_ZHSDRV1               BIT(15)
  60 #define CPCAP_BIT_ZHSDRV0               BIT(14)
  61 #define CPCAP_BIT_DPLLCLKREQ            BIT(13)
  62 #define CPCAP_BIT_SE0CONN               BIT(12)
  63 #define CPCAP_BIT_UARTTXTRI             BIT(11)
  64 #define CPCAP_BIT_UARTSWAP              BIT(10)
  65 #define CPCAP_BIT_UARTMUX1              BIT(9)
  66 #define CPCAP_BIT_UARTMUX0              BIT(8)
  67 #define CPCAP_BIT_ULPISTPLOW            BIT(7)
  68 #define CPCAP_BIT_TXENPOL               BIT(6)
  69 #define CPCAP_BIT_USBXCVREN             BIT(5)
  70 #define CPCAP_BIT_USBCNTRL              BIT(4)
  71 #define CPCAP_BIT_USBSUSPEND            BIT(3)
  72 #define CPCAP_BIT_EMUMODE2              BIT(2)
  73 #define CPCAP_BIT_EMUMODE1              BIT(1)
  74 #define CPCAP_BIT_EMUMODE0              BIT(0)
  75
  76 /* CPCAP_REG_USBC3 register bits */
  77 #define CPCAP_BIT_SPARE_898_15          BIT(15)
  78 #define CPCAP_BIT_IHSTX03               BIT(14)
  79 #define CPCAP_BIT_IHSTX02               BIT(13)
  80 #define CPCAP_BIT_IHSTX01               BIT(12)
  81 #define CPCAP_BIT_IHSTX0                BIT(11)
  82 #define CPCAP_BIT_IDPU_SPI              BIT(10)
  83 #define CPCAP_BIT_UNUSED_898_9          BIT(9)
  84 #define CPCAP_BIT_VBUSSTBY_EN           BIT(8)
  85 #define CPCAP_BIT_VBUSEN_SPI            BIT(7)
  86 #define CPCAP_BIT_VBUSPU_SPI            BIT(6)
  87 #define CPCAP_BIT_VBUSPD_SPI            BIT(5)
  88 #define CPCAP_BIT_DMPD_SPI              BIT(4)
  89 #define CPCAP_BIT_DPPD_SPI              BIT(3)
  90 #define CPCAP_BIT_SUSPEND_SPI           BIT(2)
  91 #define CPCAP_BIT_PU_SPI                BIT(1)
  92 #define CPCAP_BIT_ULPI_SPI_SEL          BIT(0)
  93
  94 struct cpcap_usb_ints_state {
  95         bool id_ground;
  96         bool id_float;
  97         bool chrg_det;
  98         bool rvrs_chrg;
  99         bool vbusov;
 100
 101         bool chrg_se1b;
 102         bool se0conn;
 103         bool rvrs_mode;
 104         bool chrgcurr1;
 105         bool vbusvld;
 106         bool sessvld;
 107         bool sessend;
 108         bool se1;
 109
 110         bool battdetb;
 111         bool dm;
 112         bool dp;
 113 };
 114
 115 enum cpcap_gpio_mode {
 116         CPCAP_DM_DP,
 117         CPCAP_MDM_RX_TX,
 118         CPCAP_UNKNOWN_DISABLED, /* Seems to disable USB lines */
 119         CPCAP_OTG_DM_DP,
 120 };
 121
 122 struct cpcap_phy_ddata {
 123         struct regmap *reg;
 124         struct device *dev;
 125         struct usb_phy phy;
 126         struct delayed_work detect_work;
 127         struct pinctrl *pins;
 128         struct pinctrl_state *pins_ulpi;
 129         struct pinctrl_state *pins_utmi;
 130         struct pinctrl_state *pins_uart;
 131         struct gpio_desc *gpio[2];
 132         struct iio_channel *vbus;
 133         struct iio_channel *id;
 134         struct regulator *vusb;
 135         atomic_t active;
 136         unsigned int vbus_provider:1;
 137         unsigned int docked:1;
 138 };
 139
 140 static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata)
 141 {
 142         int error, value = 0;
 143
 144         error = iio_read_channel_processed(ddata->vbus, &value);
 145         if (error >= 0)
 146                 return value > 3900 ? true : false;
 147
 148         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 149
 150         return false;
 151 }
 152
 153 static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
 154 {
 155         otg->host = host;
 156         if (!host)
 157                 otg->state = OTG_STATE_UNDEFINED;
 158
 159         return 0;
 160 }
 161
 162 static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg,
 163                                         struct usb_gadget *gadget)
 164 {
 165         otg->gadget = gadget;
 166         if (!gadget)
 167                 otg->state = OTG_STATE_UNDEFINED;
 168
 169         return 0;
 170 }
 171
 172 static const struct phy_ops ops = {
 173         .owner          = THIS_MODULE,
 174 };
 175
 176 static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata,
 177                                     struct cpcap_usb_ints_state *s)
 178 {
 179         int val, error;
 180
 181         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 182         if (error)
 183                 return error;
 184
 185         s->id_ground = val & BIT(15);
 186         s->id_float = val & BIT(14);
 187         s->vbusov = val & BIT(11);
 188
 189         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 190         if (error)
 191                 return error;
 192
 193         s->vbusvld = val & BIT(3);
 194         s->sessvld = val & BIT(2);
 195         s->sessend = val & BIT(1);
 196         s->se1 = val & BIT(0);
 197
 198         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 199         if (error)
 200                 return error;
 201
 202         s->dm = val & BIT(1);
 203         s->dp = val & BIT(0);
 204
 205         return 0;
 206 }
 207
 208 static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata);
 209 static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata);
 210
 211 static void cpcap_usb_try_musb_mailbox(struct cpcap_phy_ddata *ddata,
 212                                        enum musb_vbus_id_status status)
 213 {
 214         int error;
 215
 216         error = musb_mailbox(status);
 217         if (!error)
 218                 return;
 219
 220         dev_dbg(ddata->dev, "%s: musb_mailbox failed: %i\n",
 221                 __func__, error);
 222 }
 223
 224 static void cpcap_usb_detect(struct work_struct *work)
 225 {
 226         struct cpcap_phy_ddata *ddata;
 227         struct cpcap_usb_ints_state s;
 228         bool vbus = false;
 229         int error;
 230
 231         ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work);
 232
 233         error = cpcap_phy_get_ints_state(ddata, &s);
 234         if (error)
 235                 return;
 236
 237         vbus = cpcap_usb_vbus_valid(ddata);
 238
 239         /* We need to kick the VBUS as USB A-host */
 240         if (s.id_ground && ddata->vbus_provider) {
 241                 dev_dbg(ddata->dev, "still in USB A-host mode, kicking VBUS\n");
 242
 243                 cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
 244
 245                 error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
 246                                            CPCAP_BIT_VBUSSTBY_EN |
 247                                            CPCAP_BIT_VBUSEN_SPI,
 248                                            CPCAP_BIT_VBUSEN_SPI);
 249                 if (error)
 250                         goto out_err;
 251
 252                 return;
 253         }
 254
 255         if (vbus && s.id_ground && ddata->docked) {
 256                 dev_dbg(ddata->dev, "still docked as A-host, signal ID down\n");
 257
 258                 cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
 259
 260                 return;
 261         }
 262
 263         /* No VBUS needed with docks */
 264         if (vbus && s.id_ground && !ddata->vbus_provider) {
 265                 dev_dbg(ddata->dev, "connected to a dock\n");
 266
 267                 ddata->docked = true;
 268
 269                 error = cpcap_usb_set_usb_mode(ddata);
 270                 if (error)
 271                         goto out_err;
 272
 273                 cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
 274
 275                 /*
 276                  * Force check state again after musb has reoriented,
 277                  * otherwise devices won't enumerate after loading PHY
 278                  * driver.
 279                  */
 280                 schedule_delayed_work(&ddata->detect_work,
 281                                       msecs_to_jiffies(1000));
 282
 283                 return;
 284         }
 285
 286         if (s.id_ground && !ddata->docked) {
 287                 dev_dbg(ddata->dev, "id ground, USB host mode\n");
 288
 289                 ddata->vbus_provider = true;
 290
 291                 error = cpcap_usb_set_usb_mode(ddata);
 292                 if (error)
 293                         goto out_err;
 294
 295                 cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
 296
 297                 error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
 298                                            CPCAP_BIT_VBUSSTBY_EN |
 299                                            CPCAP_BIT_VBUSEN_SPI,
 300                                            CPCAP_BIT_VBUSEN_SPI);
 301                 if (error)
 302                         goto out_err;
 303
 304                 return;
 305         }
 306
 307         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
 308                                    CPCAP_BIT_VBUSSTBY_EN |
 309                                    CPCAP_BIT_VBUSEN_SPI, 0);
 310         if (error)
 311                 goto out_err;
 312
 313         vbus = cpcap_usb_vbus_valid(ddata);
 314
 315         /* Otherwise assume we're connected to a USB host */
 316         if (vbus) {
 317                 dev_dbg(ddata->dev, "connected to USB host\n");
 318                 error = cpcap_usb_set_usb_mode(ddata);
 319                 if (error)
 320                         goto out_err;
 321                 cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_VALID);
 322
 323                 return;
 324         }
 325
 326         ddata->vbus_provider = false;
 327         ddata->docked = false;
 328         cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
 329
 330         /* Default to debug UART mode */
 331         error = cpcap_usb_set_uart_mode(ddata);
 332         if (error)
 333                 goto out_err;
 334
 335         dev_dbg(ddata->dev, "set UART mode\n");
 336
 337         return;
 338
 339 out_err:
 340         dev_err(ddata->dev, "error setting cable state: %i\n", error);
 341 }
 342
 343 static irqreturn_t cpcap_phy_irq_thread(int irq, void *data)
 344 {
 345         struct cpcap_phy_ddata *ddata = data;
 346
 347         if (!atomic_read(&ddata->active))
 348                 return IRQ_NONE;
 349
 350         schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
 351
 352         return IRQ_HANDLED;
 353 }
 354
 355 static int cpcap_usb_init_irq(struct platform_device *pdev,
 356                               struct cpcap_phy_ddata *ddata,
 357                               const char *name)
 358 {
 359         int irq, error;
 360
 361         irq = platform_get_irq_byname(pdev, name);
 362         if (irq < 0)
 363                 return -ENODEV;
 364
 365         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 366                                           cpcap_phy_irq_thread,
 367                                           IRQF_SHARED,
 368                                           name, ddata);
 369         if (error) {
 370                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 371                         name, error);
 372
 373                 return error;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static const char * const cpcap_phy_irqs[] = {
 380         /* REG_INT_0 */
 381         "id_ground", "id_float",
 382
 383         /* REG_INT1 */
 384         "se0conn", "vbusvld", "sessvld", "sessend", "se1",
 385
 386         /* REG_INT_3 */
 387         "dm", "dp",
 388 };
 389
 390 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 391                                      struct cpcap_phy_ddata *ddata)
 392 {
 393         int i, error;
 394
 395         for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) {
 396                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]);
 397                 if (error)
 398                         return error;
 399         }
 400
 401         return 0;
 402 }
 403
 404 /*
 405  * Optional pins and modes. At least Motorola mapphone devices
 406  * are using two GPIOs and dynamic pinctrl to multiplex PHY pins
 407  * to UART, ULPI or UTMI mode.
 408  */
 409
 410 static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata,
 411                                    enum cpcap_gpio_mode mode)
 412 {
 413         if (!ddata->gpio[0] || !ddata->gpio[1])
 414                 return 0;
 415
 416         gpiod_set_value(ddata->gpio[0], mode & 1);
 417         gpiod_set_value(ddata->gpio[1], mode >> 1);
 418
 419         return 0;
 420 }
 421
 422 static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata)
 423 {
 424         int error;
 425
 426         /* Disable lines to prevent glitches from waking up mdm6600 */
 427         error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED);
 428         if (error)
 429                 goto out_err;
 430
 431         if (ddata->pins_uart) {
 432                 error = pinctrl_select_state(ddata->pins, ddata->pins_uart);
 433                 if (error)
 434                         goto out_err;
 435         }
 436
 437         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
 438                                    CPCAP_BIT_VBUSPD,
 439                                    CPCAP_BIT_VBUSPD);
 440         if (error)
 441                 goto out_err;
 442
 443         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
 444                                    0xffff, CPCAP_BIT_UARTMUX0 |
 445                                    CPCAP_BIT_EMUMODE0);
 446         if (error)
 447                 goto out_err;
 448
 449         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff,
 450                                    CPCAP_BIT_IDPU_SPI);
 451         if (error)
 452                 goto out_err;
 453
 454         /* Enable UART mode */
 455         error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP);
 456         if (error)
 457                 goto out_err;
 458
 459         return 0;
 460
 461 out_err:
 462         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 463
 464         return error;
 465 }
 466
 467 static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata)
 468 {
 469         int error;
 470
 471         /* Disable lines to prevent glitches from waking up mdm6600 */
 472         error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED);
 473         if (error)
 474                 return error;
 475
 476         if (ddata->pins_utmi) {
 477                 error = pinctrl_select_state(ddata->pins, ddata->pins_utmi);
 478                 if (error) {
 479                         dev_err(ddata->dev, "could not set usb mode: %i\n",
 480                                 error);
 481
 482                         return error;
 483                 }
 484         }
 485
 486         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
 487                                    CPCAP_BIT_VBUSPD, 0);
 488         if (error)
 489                 goto out_err;
 490
 491         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
 492                                    CPCAP_BIT_PU_SPI |
 493                                    CPCAP_BIT_DMPD_SPI |
 494                                    CPCAP_BIT_DPPD_SPI |
 495                                    CPCAP_BIT_SUSPEND_SPI |
 496                                    CPCAP_BIT_ULPI_SPI_SEL, 0);
 497         if (error)
 498                 goto out_err;
 499
 500         error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
 501                                    CPCAP_BIT_USBXCVREN,
 502                                    CPCAP_BIT_USBXCVREN);
 503         if (error)
 504                 goto out_err;
 505
 506         /* Enable USB mode */
 507         error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP);
 508         if (error)
 509                 goto out_err;
 510
 511         return 0;
 512
 513 out_err:
 514         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 515
 516         return error;
 517 }
 518
 519 static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata)
 520 {
 521         ddata->pins = devm_pinctrl_get(ddata->dev);
 522         if (IS_ERR(ddata->pins)) {
 523                 dev_info(ddata->dev, "default pins not configured: %ld\n",
 524                          PTR_ERR(ddata->pins));
 525                 ddata->pins = NULL;
 526
 527                 return 0;
 528         }
 529
 530         ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi");
 531         if (IS_ERR(ddata->pins_ulpi)) {
 532                 dev_info(ddata->dev, "ulpi pins not configured\n");
 533                 ddata->pins_ulpi = NULL;
 534         }
 535
 536         ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi");
 537         if (IS_ERR(ddata->pins_utmi)) {
 538                 dev_info(ddata->dev, "utmi pins not configured\n");
 539                 ddata->pins_utmi = NULL;
 540         }
 541
 542         ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart");
 543         if (IS_ERR(ddata->pins_uart)) {
 544                 dev_info(ddata->dev, "uart pins not configured\n");
 545                 ddata->pins_uart = NULL;
 546         }
 547
 548         if (ddata->pins_uart)
 549                 return pinctrl_select_state(ddata->pins, ddata->pins_uart);
 550
 551         return 0;
 552 }
 553
 554 static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata)
 555 {
 556         int i;
 557
 558         for (i = 0; i < 2; i++) {
 559                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 560                                                       i, GPIOD_OUT_HIGH);
 561                 if (IS_ERR(ddata->gpio[i])) {
 562                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 563                                  i, PTR_ERR(ddata->gpio[i]));
 564                         ddata->gpio[i] = NULL;
 565                 }
 566         }
 567 }
 568
 569 static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata)
 570 {
 571         enum iio_chan_type type;
 572         int error;
 573
 574         ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus");
 575         if (IS_ERR(ddata->vbus)) {
 576                 error = PTR_ERR(ddata->vbus);
 577                 goto out_err;
 578         }
 579
 580         if (!ddata->vbus->indio_dev) {
 581                 error = -ENXIO;
 582                 goto out_err;
 583         }
 584
 585         error = iio_get_channel_type(ddata->vbus, &type);
 586         if (error < 0)
 587                 goto out_err;
 588
 589         if (type != IIO_VOLTAGE) {
 590                 error = -EINVAL;
 591                 goto out_err;
 592         }
 593
 594         return 0;
 595
 596 out_err:
 597         dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 598                 error);
 599
 600         return error;
 601 }
 602
 603 #ifdef CONFIG_OF
 604 static const struct of_device_id cpcap_usb_phy_id_table[] = {
 605         {
 606                 .compatible = "motorola,cpcap-usb-phy",
 607         },
 608         {
 609                 .compatible = "motorola,mapphone-cpcap-usb-phy",
 610         },
 611         {},
 612 };
 613 MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table);
 614 #endif
 615
 616 static int cpcap_usb_phy_probe(struct platform_device *pdev)
 617 {
 618         struct cpcap_phy_ddata *ddata;
 619         struct phy *generic_phy;
 620         struct phy_provider *phy_provider;
 621         struct usb_otg *otg;
 622         const struct of_device_id *of_id;
 623         int error;
 624
 625         of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table),
 626                                 &pdev->dev);
 627         if (!of_id)
 628                 return -EINVAL;
 629
 630         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 631         if (!ddata)
 632                 return -ENOMEM;
 633
 634         ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
 635         if (!ddata->reg)
 636                 return -ENODEV;
 637
 638         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 639         if (!otg)
 640                 return -ENOMEM;
 641
 642         ddata->dev = &pdev->dev;
 643         ddata->phy.dev = ddata->dev;
 644         ddata->phy.label = "cpcap_usb_phy";
 645         ddata->phy.otg = otg;
 646         ddata->phy.type = USB_PHY_TYPE_USB2;
 647         otg->set_host = cpcap_usb_phy_set_host;
 648         otg->set_peripheral = cpcap_usb_phy_set_peripheral;
 649         otg->usb_phy = &ddata->phy;
 650         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 651         platform_set_drvdata(pdev, ddata);
 652
 653         ddata->vusb = devm_regulator_get(&pdev->dev, "vusb");
 654         if (IS_ERR(ddata->vusb))
 655                 return PTR_ERR(ddata->vusb);
 656
 657         error = regulator_enable(ddata->vusb);
 658         if (error)
 659                 return error;
 660
 661         generic_phy = devm_phy_create(ddata->dev, NULL, &ops);
 662         if (IS_ERR(generic_phy)) {
 663                 error = PTR_ERR(generic_phy);
 664                 return PTR_ERR(generic_phy);
 665         }
 666
 667         phy_set_drvdata(generic_phy, ddata);
 668
 669         phy_provider = devm_of_phy_provider_register(ddata->dev,
 670                                                      of_phy_simple_xlate);
 671         if (IS_ERR(phy_provider))
 672                 return PTR_ERR(phy_provider);
 673
 674         error = cpcap_usb_init_optional_pins(ddata);
 675         if (error)
 676                 return error;
 677
 678         cpcap_usb_init_optional_gpios(ddata);
 679
 680         error = cpcap_usb_init_iio(ddata);
 681         if (error)
 682                 return error;
 683
 684         error = cpcap_usb_init_interrupts(pdev, ddata);
 685         if (error)
 686                 return error;
 687
 688         usb_add_phy_dev(&ddata->phy);
 689         atomic_set(&ddata->active, 1);
 690         schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
 691
 692         return 0;
 693 }
 694
 695 static int cpcap_usb_phy_remove(struct platform_device *pdev)
 696 {
 697         struct cpcap_phy_ddata *ddata = platform_get_drvdata(pdev);
 698         int error;
 699
 700         atomic_set(&ddata->active, 0);
 701         error = cpcap_usb_set_uart_mode(ddata);
 702         if (error)
 703                 dev_err(ddata->dev, "could not set UART mode\n");
 704
 705         cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
 706
 707         usb_remove_phy(&ddata->phy);
 708         cancel_delayed_work_sync(&ddata->detect_work);
 709         regulator_disable(ddata->vusb);
 710
 711         return 0;
 712 }
 713
 714 static struct platform_driver cpcap_usb_phy_driver = {
 715         .probe          = cpcap_usb_phy_probe,
 716         .remove         = cpcap_usb_phy_remove,
 717         .driver         = {
 718                 .name   = "cpcap-usb-phy",
 719                 .of_match_table = of_match_ptr(cpcap_usb_phy_id_table),
 720         },
 721 };
 722
 723 module_platform_driver(cpcap_usb_phy_driver);
 724
 725 MODULE_ALIAS("platform:cpcap_usb");
 726 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 727 MODULE_DESCRIPTION("CPCAP usb phy driver");
 728 MODULE_LICENSE("GPL v2");