drivers/usb/otg/twl4030-usb.c

   1 /*
   2  * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
   3  *
   4  * Copyright (C) 2004-2007 Texas Instruments
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * Current status:
  23  *      - HS USB ULPI mode works.
  24  *      - 3-pin mode support may be added in future.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/io.h>
  34 #include <linux/delay.h>
  35 #include <linux/usb/otg.h>
  36 #include <linux/usb/ulpi.h>
  37 #include <linux/i2c/twl.h>
  38 #include <linux/regulator/consumer.h>
  39 #include <linux/err.h>
  40 #include <linux/notifier.h>
  41 #include <linux/slab.h>
  42
  43 /* Register defines */
  44
  45 #define MCPC_CTRL                       0x30
  46 #define MCPC_CTRL_RTSOL                 (1 << 7)
  47 #define MCPC_CTRL_EXTSWR                (1 << 6)
  48 #define MCPC_CTRL_EXTSWC                (1 << 5)
  49 #define MCPC_CTRL_VOICESW               (1 << 4)
  50 #define MCPC_CTRL_OUT64K                (1 << 3)
  51 #define MCPC_CTRL_RTSCTSSW              (1 << 2)
  52 #define MCPC_CTRL_HS_UART               (1 << 0)
  53
  54 #define MCPC_IO_CTRL                    0x33
  55 #define MCPC_IO_CTRL_MICBIASEN          (1 << 5)
  56 #define MCPC_IO_CTRL_CTS_NPU            (1 << 4)
  57 #define MCPC_IO_CTRL_RXD_PU             (1 << 3)
  58 #define MCPC_IO_CTRL_TXDTYP             (1 << 2)
  59 #define MCPC_IO_CTRL_CTSTYP             (1 << 1)
  60 #define MCPC_IO_CTRL_RTSTYP             (1 << 0)
  61
  62 #define MCPC_CTRL2                      0x36
  63 #define MCPC_CTRL2_MCPC_CK_EN           (1 << 0)
  64
  65 #define OTHER_FUNC_CTRL                 0x80
  66 #define OTHER_FUNC_CTRL_BDIS_ACON_EN    (1 << 4)
  67 #define OTHER_FUNC_CTRL_FIVEWIRE_MODE   (1 << 2)
  68
  69 #define OTHER_IFC_CTRL                  0x83
  70 #define OTHER_IFC_CTRL_OE_INT_EN        (1 << 6)
  71 #define OTHER_IFC_CTRL_CEA2011_MODE     (1 << 5)
  72 #define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN      (1 << 4)
  73 #define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT       (1 << 3)
  74 #define OTHER_IFC_CTRL_HIZ_ULPI         (1 << 2)
  75 #define OTHER_IFC_CTRL_ALT_INT_REROUTE  (1 << 0)
  76
  77 #define OTHER_INT_EN_RISE               0x86
  78 #define OTHER_INT_EN_FALL               0x89
  79 #define OTHER_INT_STS                   0x8C
  80 #define OTHER_INT_LATCH                 0x8D
  81 #define OTHER_INT_VB_SESS_VLD           (1 << 7)
  82 #define OTHER_INT_DM_HI                 (1 << 6) /* not valid for "latch" reg */
  83 #define OTHER_INT_DP_HI                 (1 << 5) /* not valid for "latch" reg */
  84 #define OTHER_INT_BDIS_ACON             (1 << 3) /* not valid for "fall" regs */
  85 #define OTHER_INT_MANU                  (1 << 1)
  86 #define OTHER_INT_ABNORMAL_STRESS       (1 << 0)
  87
  88 #define ID_STATUS                       0x96
  89 #define ID_RES_FLOAT                    (1 << 4)
  90 #define ID_RES_440K                     (1 << 3)
  91 #define ID_RES_200K                     (1 << 2)
  92 #define ID_RES_102K                     (1 << 1)
  93 #define ID_RES_GND                      (1 << 0)
  94
  95 #define POWER_CTRL                      0xAC
  96 #define POWER_CTRL_OTG_ENAB             (1 << 5)
  97
  98 #define OTHER_IFC_CTRL2                 0xAF
  99 #define OTHER_IFC_CTRL2_ULPI_STP_LOW    (1 << 4)
 100 #define OTHER_IFC_CTRL2_ULPI_TXEN_POL   (1 << 3)
 101 #define OTHER_IFC_CTRL2_ULPI_4PIN_2430  (1 << 2)
 102 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK     (3 << 0) /* bits 0 and 1 */
 103 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N    (0 << 0)
 104 #define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N    (1 << 0)
 105
 106 #define REG_CTRL_EN                     0xB2
 107 #define REG_CTRL_ERROR                  0xB5
 108 #define ULPI_I2C_CONFLICT_INTEN         (1 << 0)
 109
 110 #define OTHER_FUNC_CTRL2                0xB8
 111 #define OTHER_FUNC_CTRL2_VBAT_TIMER_EN  (1 << 0)
 112
 113 /* following registers do not have separate _clr and _set registers */
 114 #define VBUS_DEBOUNCE                   0xC0
 115 #define ID_DEBOUNCE                     0xC1
 116 #define VBAT_TIMER                      0xD3
 117 #define PHY_PWR_CTRL                    0xFD
 118 #define PHY_PWR_PHYPWD                  (1 << 0)
 119 #define PHY_CLK_CTRL                    0xFE
 120 #define PHY_CLK_CTRL_CLOCKGATING_EN     (1 << 2)
 121 #define PHY_CLK_CTRL_CLK32K_EN          (1 << 1)
 122 #define REQ_PHY_DPLL_CLK                (1 << 0)
 123 #define PHY_CLK_CTRL_STS                0xFF
 124 #define PHY_DPLL_CLK                    (1 << 0)
 125
 126 /* In module TWL4030_MODULE_PM_MASTER */
 127 #define STS_HW_CONDITIONS               0x0F
 128
 129 /* In module TWL4030_MODULE_PM_RECEIVER */
 130 #define VUSB_DEDICATED1                 0x7D
 131 #define VUSB_DEDICATED2                 0x7E
 132 #define VUSB1V5_DEV_GRP                 0x71
 133 #define VUSB1V5_TYPE                    0x72
 134 #define VUSB1V5_REMAP                   0x73
 135 #define VUSB1V8_DEV_GRP                 0x74
 136 #define VUSB1V8_TYPE                    0x75
 137 #define VUSB1V8_REMAP                   0x76
 138 #define VUSB3V1_DEV_GRP                 0x77
 139 #define VUSB3V1_TYPE                    0x78
 140 #define VUSB3V1_REMAP                   0x79
 141
 142 /* In module TWL4030_MODULE_INTBR */
 143 #define PMBR1                           0x0D
 144 #define GPIO_USB_4PIN_ULPI_2430C        (3 << 0)
 145
 146 struct twl4030_usb {
 147         struct otg_transceiver  otg;
 148         struct device           *dev;
 149
 150         /* TWL4030 internal USB regulator supplies */
 151         struct regulator        *usb1v5;
 152         struct regulator        *usb1v8;
 153         struct regulator        *usb3v1;
 154
 155         /* for vbus reporting with irqs disabled */
 156         spinlock_t              lock;
 157
 158         /* pin configuration */
 159         enum twl4030_usb_mode   usb_mode;
 160
 161         int                     irq;
 162         u8                      linkstat;
 163         u8                      asleep;
 164         bool                    irq_enabled;
 165 };
 166
 167 /* internal define on top of container_of */
 168 #define xceiv_to_twl(x)         container_of((x), struct twl4030_usb, otg);
 169
 170 /*-------------------------------------------------------------------------*/
 171
 172 static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
 173                 u8 module, u8 data, u8 address)
 174 {
 175         u8 check;
 176
 177         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
 178             (twl_i2c_read_u8(module, &check, address) >= 0) &&
 179                                                 (check == data))
 180                 return 0;
 181         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
 182                         1, module, address, check, data);
 183
 184         /* Failed once: Try again */
 185         if ((twl_i2c_write_u8(module, data, address) >= 0) &&
 186             (twl_i2c_read_u8(module, &check, address) >= 0) &&
 187                                                 (check == data))
 188                 return 0;
 189         dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
 190                         2, module, address, check, data);
 191
 192         /* Failed again: Return error */
 193         return -EBUSY;
 194 }
 195
 196 #define twl4030_usb_write_verify(twl, address, data)    \
 197         twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
 198
 199 static inline int twl4030_usb_write(struct twl4030_usb *twl,
 200                 u8 address, u8 data)
 201 {
 202         int ret = 0;
 203
 204         ret = twl_i2c_write_u8(TWL4030_MODULE_USB, data, address);
 205         if (ret < 0)
 206                 dev_dbg(twl->dev,
 207                         "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
 208         return ret;
 209 }
 210
 211 static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
 212 {
 213         u8 data;
 214         int ret = 0;
 215
 216         ret = twl_i2c_read_u8(module, &data, address);
 217         if (ret >= 0)
 218                 ret = data;
 219         else
 220                 dev_dbg(twl->dev,
 221                         "TWL4030:readb[0x%x,0x%x] Error %d\n",
 222                                         module, address, ret);
 223
 224         return ret;
 225 }
 226
 227 static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
 228 {
 229         return twl4030_readb(twl, TWL4030_MODULE_USB, address);
 230 }
 231
 232 /*-------------------------------------------------------------------------*/
 233
 234 static inline int
 235 twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 236 {
 237         return twl4030_usb_write(twl, ULPI_SET(reg), bits);
 238 }
 239
 240 static inline int
 241 twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 242 {
 243         return twl4030_usb_write(twl, ULPI_CLR(reg), bits);
 244 }
 245
 246 /*-------------------------------------------------------------------------*/
 247
 248 static enum usb_xceiv_events twl4030_usb_linkstat(struct twl4030_usb *twl)
 249 {
 250         int     status;
 251         int     linkstat = USB_EVENT_NONE;
 252
 253         /*
 254          * For ID/VBUS sensing, see manual section 15.4.8 ...
 255          * except when using only battery backup power, two
 256          * comparators produce VBUS_PRES and ID_PRES signals,
 257          * which don't match docs elsewhere.  But ... BIT(7)
 258          * and BIT(2) of STS_HW_CONDITIONS, respectively, do
 259          * seem to match up.  If either is true the USB_PRES
 260          * signal is active, the OTG module is activated, and
 261          * its interrupt may be raised (may wake the system).
 262          */
 263         status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER,
 264                         STS_HW_CONDITIONS);
 265         if (status < 0)
 266                 dev_err(twl->dev, "USB link status err %d\n", status);
 267         else if (status & (BIT(7) | BIT(2))) {
 268                 if (status & BIT(2))
 269                         linkstat = USB_EVENT_ID;
 270                 else
 271                         linkstat = USB_EVENT_VBUS;
 272         } else
 273                 linkstat = USB_EVENT_NONE;
 274
 275         dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
 276                         status, status, linkstat);
 277
 278         twl->otg.last_event = linkstat;
 279
 280         /* REVISIT this assumes host and peripheral controllers
 281          * are registered, and that both are active...
 282          */
 283
 284         spin_lock_irq(&twl->lock);
 285         twl->linkstat = linkstat;
 286         if (linkstat == USB_EVENT_ID) {
 287                 twl->otg.default_a = true;
 288                 twl->otg.state = OTG_STATE_A_IDLE;
 289         } else {
 290                 twl->otg.default_a = false;
 291                 twl->otg.state = OTG_STATE_B_IDLE;
 292         }
 293         spin_unlock_irq(&twl->lock);
 294
 295         return linkstat;
 296 }
 297
 298 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
 299 {
 300         twl->usb_mode = mode;
 301
 302         switch (mode) {
 303         case T2_USB_MODE_ULPI:
 304                 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
 305                                         ULPI_IFC_CTRL_CARKITMODE);
 306                 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 307                 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
 308                                         ULPI_FUNC_CTRL_XCVRSEL_MASK |
 309                                         ULPI_FUNC_CTRL_OPMODE_MASK);
 310                 break;
 311         case -1:
 312                 /* FIXME: power on defaults */
 313                 break;
 314         default:
 315                 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
 316                                 mode);
 317                 break;
 318         };
 319 }
 320
 321 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
 322 {
 323         unsigned long timeout;
 324         int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 325
 326         if (val >= 0) {
 327                 if (on) {
 328                         /* enable DPLL to access PHY registers over I2C */
 329                         val |= REQ_PHY_DPLL_CLK;
 330                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 331                                                 (u8)val) < 0);
 332
 333                         timeout = jiffies + HZ;
 334                         while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 335                                                         PHY_DPLL_CLK)
 336                                 && time_before(jiffies, timeout))
 337                                         udelay(10);
 338                         if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 339                                                         PHY_DPLL_CLK))
 340                                 dev_err(twl->dev, "Timeout setting T2 HSUSB "
 341                                                 "PHY DPLL clock\n");
 342                 } else {
 343                         /* let ULPI control the DPLL clock */
 344                         val &= ~REQ_PHY_DPLL_CLK;
 345                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 346                                                 (u8)val) < 0);
 347                 }
 348         }
 349 }
 350
 351 static void __twl4030_phy_power(struct twl4030_usb *twl, int on)
 352 {
 353         u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
 354
 355         if (on)
 356                 pwr &= ~PHY_PWR_PHYPWD;
 357         else
 358                 pwr |= PHY_PWR_PHYPWD;
 359
 360         WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
 361 }
 362
 363 static void twl4030_phy_power(struct twl4030_usb *twl, int on)
 364 {
 365         if (on) {
 366                 regulator_enable(twl->usb3v1);
 367                 regulator_enable(twl->usb1v8);
 368                 /*
 369                  * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
 370                  * in twl4030) resets the VUSB_DEDICATED2 register. This reset
 371                  * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
 372                  * SLEEP. We work around this by clearing the bit after usv3v1
 373                  * is re-activated. This ensures that VUSB3V1 is really active.
 374                  */
 375                 twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
 376                                                         VUSB_DEDICATED2);
 377                 regulator_enable(twl->usb1v5);
 378                 __twl4030_phy_power(twl, 1);
 379                 twl4030_usb_write(twl, PHY_CLK_CTRL,
 380                                   twl4030_usb_read(twl, PHY_CLK_CTRL) |
 381                                         (PHY_CLK_CTRL_CLOCKGATING_EN |
 382                                                 PHY_CLK_CTRL_CLK32K_EN));
 383         } else {
 384                 __twl4030_phy_power(twl, 0);
 385                 regulator_disable(twl->usb1v5);
 386                 regulator_disable(twl->usb1v8);
 387                 regulator_disable(twl->usb3v1);
 388         }
 389 }
 390
 391 static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
 392 {
 393         if (twl->asleep)
 394                 return;
 395
 396         twl4030_phy_power(twl, 0);
 397         twl->asleep = 1;
 398         dev_dbg(twl->dev, "%s\n", __func__);
 399 }
 400
 401 static void __twl4030_phy_resume(struct twl4030_usb *twl)
 402 {
 403         twl4030_phy_power(twl, 1);
 404         twl4030_i2c_access(twl, 1);
 405         twl4030_usb_set_mode(twl, twl->usb_mode);
 406         if (twl->usb_mode == T2_USB_MODE_ULPI)
 407                 twl4030_i2c_access(twl, 0);
 408 }
 409
 410 static void twl4030_phy_resume(struct twl4030_usb *twl)
 411 {
 412         if (!twl->asleep)
 413                 return;
 414         __twl4030_phy_resume(twl);
 415         twl->asleep = 0;
 416         dev_dbg(twl->dev, "%s\n", __func__);
 417 }
 418
 419 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
 420 {
 421         /* Enable writing to power configuration registers */
 422         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 423                         TWL4030_PM_MASTER_KEY_CFG1,
 424                         TWL4030_PM_MASTER_PROTECT_KEY);
 425
 426         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 427                         TWL4030_PM_MASTER_KEY_CFG2,
 428                         TWL4030_PM_MASTER_PROTECT_KEY);
 429
 430         /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/
 431         /*twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/
 432
 433         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
 434         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
 435
 436         /* Initialize 3.1V regulator */
 437         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
 438
 439         twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
 440         if (IS_ERR(twl->usb3v1))
 441                 return -ENODEV;
 442
 443         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
 444
 445         /* Initialize 1.5V regulator */
 446         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
 447
 448         twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
 449         if (IS_ERR(twl->usb1v5))
 450                 goto fail1;
 451
 452         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
 453
 454         /* Initialize 1.8V regulator */
 455         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
 456
 457         twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
 458         if (IS_ERR(twl->usb1v8))
 459                 goto fail2;
 460
 461         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
 462
 463         /* disable access to power configuration registers */
 464         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
 465                         TWL4030_PM_MASTER_PROTECT_KEY);
 466
 467         return 0;
 468
 469 fail2:
 470         regulator_put(twl->usb1v5);
 471         twl->usb1v5 = NULL;
 472 fail1:
 473         regulator_put(twl->usb3v1);
 474         twl->usb3v1 = NULL;
 475         return -ENODEV;
 476 }
 477
 478 static ssize_t twl4030_usb_vbus_show(struct device *dev,
 479                 struct device_attribute *attr, char *buf)
 480 {
 481         struct twl4030_usb *twl = dev_get_drvdata(dev);
 482         unsigned long flags;
 483         int ret = -EINVAL;
 484
 485         spin_lock_irqsave(&twl->lock, flags);
 486         ret = sprintf(buf, "%s\n",
 487                         (twl->linkstat == USB_EVENT_VBUS) ? "on" : "off");
 488         spin_unlock_irqrestore(&twl->lock, flags);
 489
 490         return ret;
 491 }
 492 static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
 493
 494 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 495 {
 496         struct twl4030_usb *twl = _twl;
 497         int status;
 498
 499         status = twl4030_usb_linkstat(twl);
 500         if (status >= 0) {
 501                 /* FIXME add a set_power() method so that B-devices can
 502                  * configure the charger appropriately.  It's not always
 503                  * correct to consume VBUS power, and how much current to
 504                  * consume is a function of the USB configuration chosen
 505                  * by the host.
 506                  *
 507                  * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
 508                  * its disconnect() sibling, when changing to/from the
 509                  * USB_LINK_VBUS state.  musb_hdrc won't care until it
 510                  * starts to handle softconnect right.
 511                  */
 512                 if (status == USB_EVENT_NONE)
 513                         twl4030_phy_suspend(twl, 0);
 514                 else
 515                         twl4030_phy_resume(twl);
 516
 517                 atomic_notifier_call_chain(&twl->otg.notifier, status,
 518                                 twl->otg.gadget);
 519         }
 520         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 521
 522         return IRQ_HANDLED;
 523 }
 524
 525 static void twl4030_usb_phy_init(struct twl4030_usb *twl)
 526 {
 527         int status;
 528
 529         status = twl4030_usb_linkstat(twl);
 530         if (status >= 0) {
 531                 if (status == USB_EVENT_NONE) {
 532                         __twl4030_phy_power(twl, 0);
 533                         twl->asleep = 1;
 534                 } else {
 535                         __twl4030_phy_resume(twl);
 536                         twl->asleep = 0;
 537                 }
 538
 539                 atomic_notifier_call_chain(&twl->otg.notifier, status,
 540                                 twl->otg.gadget);
 541         }
 542         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 543 }
 544
 545 static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
 546 {
 547         struct twl4030_usb *twl = xceiv_to_twl(x);
 548
 549         if (suspend)
 550                 twl4030_phy_suspend(twl, 1);
 551         else
 552                 twl4030_phy_resume(twl);
 553
 554         return 0;
 555 }
 556
 557 static int twl4030_set_peripheral(struct otg_transceiver *x,
 558                 struct usb_gadget *gadget)
 559 {
 560         struct twl4030_usb *twl;
 561
 562         if (!x)
 563                 return -ENODEV;
 564
 565         twl = xceiv_to_twl(x);
 566         twl->otg.gadget = gadget;
 567         if (!gadget)
 568                 twl->otg.state = OTG_STATE_UNDEFINED;
 569
 570         return 0;
 571 }
 572
 573 static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
 574 {
 575         struct twl4030_usb *twl;
 576
 577         if (!x)
 578                 return -ENODEV;
 579
 580         twl = xceiv_to_twl(x);
 581         twl->otg.host = host;
 582         if (!host)
 583                 twl->otg.state = OTG_STATE_UNDEFINED;
 584
 585         return 0;
 586 }
 587
 588 static int __devinit twl4030_usb_probe(struct platform_device *pdev)
 589 {
 590         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
 591         struct twl4030_usb      *twl;
 592         int                     status, err;
 593
 594         if (!pdata) {
 595                 dev_dbg(&pdev->dev, "platform_data not available\n");
 596                 return -EINVAL;
 597         }
 598
 599         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 600         if (!twl)
 601                 return -ENOMEM;
 602
 603         twl->dev                = &pdev->dev;
 604         twl->irq                = platform_get_irq(pdev, 0);
 605         twl->otg.dev            = twl->dev;
 606         twl->otg.label          = "twl4030";
 607         twl->otg.set_host       = twl4030_set_host;
 608         twl->otg.set_peripheral = twl4030_set_peripheral;
 609         twl->otg.set_suspend    = twl4030_set_suspend;
 610         twl->usb_mode           = pdata->usb_mode;
 611         twl->asleep = 1;
 612
 613         /* init spinlock for workqueue */
 614         spin_lock_init(&twl->lock);
 615
 616         err = twl4030_usb_ldo_init(twl);
 617         if (err) {
 618                 dev_err(&pdev->dev, "ldo init failed\n");
 619                 kfree(twl);
 620                 return err;
 621         }
 622         otg_set_transceiver(&twl->otg);
 623
 624         platform_set_drvdata(pdev, twl);
 625         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 626                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 627
 628         ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
 629
 630         /* Our job is to use irqs and status from the power module
 631          * to keep the transceiver disabled when nothing's connected.
 632          *
 633          * FIXME we actually shouldn't start enabling it until the
 634          * USB controller drivers have said they're ready, by calling
 635          * set_host() and/or set_peripheral() ... OTG_capable boards
 636          * need both handles, otherwise just one suffices.
 637          */
 638         twl->irq_enabled = true;
 639         status = request_threaded_irq(twl->irq, NULL, twl4030_usb_irq,
 640                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 641                         "twl4030_usb", twl);
 642         if (status < 0) {
 643                 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
 644                         twl->irq, status);
 645                 kfree(twl);
 646                 return status;
 647         }
 648
 649         /* Power down phy or make it work according to
 650          * current link state.
 651          */
 652         twl4030_usb_phy_init(twl);
 653
 654         dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
 655         return 0;
 656 }
 657
 658 static int __exit twl4030_usb_remove(struct platform_device *pdev)
 659 {
 660         struct twl4030_usb *twl = platform_get_drvdata(pdev);
 661         int val;
 662
 663         free_irq(twl->irq, twl);
 664         device_remove_file(twl->dev, &dev_attr_vbus);
 665
 666         /* set transceiver mode to power on defaults */
 667         twl4030_usb_set_mode(twl, -1);
 668
 669         /* autogate 60MHz ULPI clock,
 670          * clear dpll clock request for i2c access,
 671          * disable 32KHz
 672          */
 673         val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 674         if (val >= 0) {
 675                 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
 676                 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
 677                 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
 678         }
 679
 680         /* disable complete OTG block */
 681         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 682
 683         if (!twl->asleep)
 684                 twl4030_phy_power(twl, 0);
 685         regulator_put(twl->usb1v5);
 686         regulator_put(twl->usb1v8);
 687         regulator_put(twl->usb3v1);
 688
 689         kfree(twl);
 690
 691         return 0;
 692 }
 693
 694 static struct platform_driver twl4030_usb_driver = {
 695         .probe          = twl4030_usb_probe,
 696         .remove         = __exit_p(twl4030_usb_remove),
 697         .driver         = {
 698                 .name   = "twl4030_usb",
 699                 .owner  = THIS_MODULE,
 700         },
 701 };
 702
 703 static int __init twl4030_usb_init(void)
 704 {
 705         return platform_driver_register(&twl4030_usb_driver);
 706 }
 707 subsys_initcall(twl4030_usb_init);
 708
 709 static void __exit twl4030_usb_exit(void)
 710 {
 711         platform_driver_unregister(&twl4030_usb_driver);
 712 }
 713 module_exit(twl4030_usb_exit);
 714
 715 MODULE_ALIAS("platform:twl4030_usb");
 716 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
 717 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
 718 MODULE_LICENSE("GPL");