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         /* REVISIT this assumes host and peripheral controllers
 279          * are registered, and that both are active...
 280          */
 281
 282         spin_lock_irq(&twl->lock);
 283         twl->linkstat = linkstat;
 284         if (linkstat == USB_EVENT_ID) {
 285                 twl->otg.default_a = true;
 286                 twl->otg.state = OTG_STATE_A_IDLE;
 287         } else {
 288                 twl->otg.default_a = false;
 289                 twl->otg.state = OTG_STATE_B_IDLE;
 290         }
 291         spin_unlock_irq(&twl->lock);
 292
 293         return linkstat;
 294 }
 295
 296 static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
 297 {
 298         twl->usb_mode = mode;
 299
 300         switch (mode) {
 301         case T2_USB_MODE_ULPI:
 302                 twl4030_usb_clear_bits(twl, ULPI_IFC_CTRL,
 303                                         ULPI_IFC_CTRL_CARKITMODE);
 304                 twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 305                 twl4030_usb_clear_bits(twl, ULPI_FUNC_CTRL,
 306                                         ULPI_FUNC_CTRL_XCVRSEL_MASK |
 307                                         ULPI_FUNC_CTRL_OPMODE_MASK);
 308                 break;
 309         case -1:
 310                 /* FIXME: power on defaults */
 311                 break;
 312         default:
 313                 dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
 314                                 mode);
 315                 break;
 316         };
 317 }
 318
 319 static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
 320 {
 321         unsigned long timeout;
 322         int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 323
 324         if (val >= 0) {
 325                 if (on) {
 326                         /* enable DPLL to access PHY registers over I2C */
 327                         val |= REQ_PHY_DPLL_CLK;
 328                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 329                                                 (u8)val) < 0);
 330
 331                         timeout = jiffies + HZ;
 332                         while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 333                                                         PHY_DPLL_CLK)
 334                                 && time_before(jiffies, timeout))
 335                                         udelay(10);
 336                         if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
 337                                                         PHY_DPLL_CLK))
 338                                 dev_err(twl->dev, "Timeout setting T2 HSUSB "
 339                                                 "PHY DPLL clock\n");
 340                 } else {
 341                         /* let ULPI control the DPLL clock */
 342                         val &= ~REQ_PHY_DPLL_CLK;
 343                         WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
 344                                                 (u8)val) < 0);
 345                 }
 346         }
 347 }
 348
 349 static void __twl4030_phy_power(struct twl4030_usb *twl, int on)
 350 {
 351         u8 pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
 352
 353         if (on)
 354                 pwr &= ~PHY_PWR_PHYPWD;
 355         else
 356                 pwr |= PHY_PWR_PHYPWD;
 357
 358         WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
 359 }
 360
 361 static void twl4030_phy_power(struct twl4030_usb *twl, int on)
 362 {
 363         if (on) {
 364                 regulator_enable(twl->usb3v1);
 365                 regulator_enable(twl->usb1v8);
 366                 /*
 367                  * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
 368                  * in twl4030) resets the VUSB_DEDICATED2 register. This reset
 369                  * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
 370                  * SLEEP. We work around this by clearing the bit after usv3v1
 371                  * is re-activated. This ensures that VUSB3V1 is really active.
 372                  */
 373                 twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
 374                                                         VUSB_DEDICATED2);
 375                 regulator_enable(twl->usb1v5);
 376                 __twl4030_phy_power(twl, 1);
 377                 twl4030_usb_write(twl, PHY_CLK_CTRL,
 378                                   twl4030_usb_read(twl, PHY_CLK_CTRL) |
 379                                         (PHY_CLK_CTRL_CLOCKGATING_EN |
 380                                                 PHY_CLK_CTRL_CLK32K_EN));
 381         } else {
 382                 __twl4030_phy_power(twl, 0);
 383                 regulator_disable(twl->usb1v5);
 384                 regulator_disable(twl->usb1v8);
 385                 regulator_disable(twl->usb3v1);
 386         }
 387 }
 388
 389 static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
 390 {
 391         if (twl->asleep)
 392                 return;
 393
 394         twl4030_phy_power(twl, 0);
 395         twl->asleep = 1;
 396         dev_dbg(twl->dev, "%s\n", __func__);
 397 }
 398
 399 static void __twl4030_phy_resume(struct twl4030_usb *twl)
 400 {
 401         twl4030_phy_power(twl, 1);
 402         twl4030_i2c_access(twl, 1);
 403         twl4030_usb_set_mode(twl, twl->usb_mode);
 404         if (twl->usb_mode == T2_USB_MODE_ULPI)
 405                 twl4030_i2c_access(twl, 0);
 406 }
 407
 408 static void twl4030_phy_resume(struct twl4030_usb *twl)
 409 {
 410         if (!twl->asleep)
 411                 return;
 412         __twl4030_phy_resume(twl);
 413         twl->asleep = 0;
 414         dev_dbg(twl->dev, "%s\n", __func__);
 415 }
 416
 417 static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
 418 {
 419         /* Enable writing to power configuration registers */
 420         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 421                         TWL4030_PM_MASTER_KEY_CFG1,
 422                         TWL4030_PM_MASTER_PROTECT_KEY);
 423
 424         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 425                         TWL4030_PM_MASTER_KEY_CFG2,
 426                         TWL4030_PM_MASTER_PROTECT_KEY);
 427
 428         /* Keep VUSB3V1 LDO in sleep state until VBUS/ID change detected*/
 429         /*twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);*/
 430
 431         /* input to VUSB3V1 LDO is from VBAT, not VBUS */
 432         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
 433
 434         /* Initialize 3.1V regulator */
 435         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
 436
 437         twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
 438         if (IS_ERR(twl->usb3v1))
 439                 return -ENODEV;
 440
 441         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
 442
 443         /* Initialize 1.5V regulator */
 444         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
 445
 446         twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
 447         if (IS_ERR(twl->usb1v5))
 448                 goto fail1;
 449
 450         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
 451
 452         /* Initialize 1.8V regulator */
 453         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
 454
 455         twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
 456         if (IS_ERR(twl->usb1v8))
 457                 goto fail2;
 458
 459         twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
 460
 461         /* disable access to power configuration registers */
 462         twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
 463                         TWL4030_PM_MASTER_PROTECT_KEY);
 464
 465         return 0;
 466
 467 fail2:
 468         regulator_put(twl->usb1v5);
 469         twl->usb1v5 = NULL;
 470 fail1:
 471         regulator_put(twl->usb3v1);
 472         twl->usb3v1 = NULL;
 473         return -ENODEV;
 474 }
 475
 476 static ssize_t twl4030_usb_vbus_show(struct device *dev,
 477                 struct device_attribute *attr, char *buf)
 478 {
 479         struct twl4030_usb *twl = dev_get_drvdata(dev);
 480         unsigned long flags;
 481         int ret = -EINVAL;
 482
 483         spin_lock_irqsave(&twl->lock, flags);
 484         ret = sprintf(buf, "%s\n",
 485                         (twl->linkstat == USB_EVENT_VBUS) ? "on" : "off");
 486         spin_unlock_irqrestore(&twl->lock, flags);
 487
 488         return ret;
 489 }
 490 static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
 491
 492 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 493 {
 494         struct twl4030_usb *twl = _twl;
 495         int status;
 496
 497         status = twl4030_usb_linkstat(twl);
 498         if (status >= 0) {
 499                 /* FIXME add a set_power() method so that B-devices can
 500                  * configure the charger appropriately.  It's not always
 501                  * correct to consume VBUS power, and how much current to
 502                  * consume is a function of the USB configuration chosen
 503                  * by the host.
 504                  *
 505                  * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
 506                  * its disconnect() sibling, when changing to/from the
 507                  * USB_LINK_VBUS state.  musb_hdrc won't care until it
 508                  * starts to handle softconnect right.
 509                  */
 510                 if (status == USB_EVENT_NONE)
 511                         twl4030_phy_suspend(twl, 0);
 512                 else
 513                         twl4030_phy_resume(twl);
 514
 515                 blocking_notifier_call_chain(&twl->otg.notifier, status,
 516                                 twl->otg.gadget);
 517         }
 518         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 519
 520         return IRQ_HANDLED;
 521 }
 522
 523 static void twl4030_usb_phy_init(struct twl4030_usb *twl)
 524 {
 525         int status;
 526
 527         status = twl4030_usb_linkstat(twl);
 528         if (status >= 0) {
 529                 if (status == USB_EVENT_NONE) {
 530                         __twl4030_phy_power(twl, 0);
 531                         twl->asleep = 1;
 532                 } else {
 533                         __twl4030_phy_resume(twl);
 534                         twl->asleep = 0;
 535                 }
 536
 537                 blocking_notifier_call_chain(&twl->otg.notifier, status,
 538                                 twl->otg.gadget);
 539         }
 540         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 541 }
 542
 543 static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
 544 {
 545         struct twl4030_usb *twl = xceiv_to_twl(x);
 546
 547         if (suspend)
 548                 twl4030_phy_suspend(twl, 1);
 549         else
 550                 twl4030_phy_resume(twl);
 551
 552         return 0;
 553 }
 554
 555 static int twl4030_set_peripheral(struct otg_transceiver *x,
 556                 struct usb_gadget *gadget)
 557 {
 558         struct twl4030_usb *twl;
 559
 560         if (!x)
 561                 return -ENODEV;
 562
 563         twl = xceiv_to_twl(x);
 564         twl->otg.gadget = gadget;
 565         if (!gadget)
 566                 twl->otg.state = OTG_STATE_UNDEFINED;
 567
 568         return 0;
 569 }
 570
 571 static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
 572 {
 573         struct twl4030_usb *twl;
 574
 575         if (!x)
 576                 return -ENODEV;
 577
 578         twl = xceiv_to_twl(x);
 579         twl->otg.host = host;
 580         if (!host)
 581                 twl->otg.state = OTG_STATE_UNDEFINED;
 582
 583         return 0;
 584 }
 585
 586 static int __devinit twl4030_usb_probe(struct platform_device *pdev)
 587 {
 588         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
 589         struct twl4030_usb      *twl;
 590         int                     status, err;
 591
 592         if (!pdata) {
 593                 dev_dbg(&pdev->dev, "platform_data not available\n");
 594                 return -EINVAL;
 595         }
 596
 597         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 598         if (!twl)
 599                 return -ENOMEM;
 600
 601         twl->dev                = &pdev->dev;
 602         twl->irq                = platform_get_irq(pdev, 0);
 603         twl->otg.dev            = twl->dev;
 604         twl->otg.label          = "twl4030";
 605         twl->otg.set_host       = twl4030_set_host;
 606         twl->otg.set_peripheral = twl4030_set_peripheral;
 607         twl->otg.set_suspend    = twl4030_set_suspend;
 608         twl->usb_mode           = pdata->usb_mode;
 609         twl->asleep = 1;
 610
 611         /* init spinlock for workqueue */
 612         spin_lock_init(&twl->lock);
 613
 614         err = twl4030_usb_ldo_init(twl);
 615         if (err) {
 616                 dev_err(&pdev->dev, "ldo init failed\n");
 617                 kfree(twl);
 618                 return err;
 619         }
 620         otg_set_transceiver(&twl->otg);
 621
 622         platform_set_drvdata(pdev, twl);
 623         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 624                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 625
 626         BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
 627
 628         /* Our job is to use irqs and status from the power module
 629          * to keep the transceiver disabled when nothing's connected.
 630          *
 631          * FIXME we actually shouldn't start enabling it until the
 632          * USB controller drivers have said they're ready, by calling
 633          * set_host() and/or set_peripheral() ... OTG_capable boards
 634          * need both handles, otherwise just one suffices.
 635          */
 636         twl->irq_enabled = true;
 637         status = request_threaded_irq(twl->irq, NULL, twl4030_usb_irq,
 638                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 639                         "twl4030_usb", twl);
 640         if (status < 0) {
 641                 dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
 642                         twl->irq, status);
 643                 kfree(twl);
 644                 return status;
 645         }
 646
 647         /* Power down phy or make it work according to
 648          * current link state.
 649          */
 650         twl4030_usb_phy_init(twl);
 651
 652         dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
 653         return 0;
 654 }
 655
 656 static int __exit twl4030_usb_remove(struct platform_device *pdev)
 657 {
 658         struct twl4030_usb *twl = platform_get_drvdata(pdev);
 659         int val;
 660
 661         free_irq(twl->irq, twl);
 662         device_remove_file(twl->dev, &dev_attr_vbus);
 663
 664         /* set transceiver mode to power on defaults */
 665         twl4030_usb_set_mode(twl, -1);
 666
 667         /* autogate 60MHz ULPI clock,
 668          * clear dpll clock request for i2c access,
 669          * disable 32KHz
 670          */
 671         val = twl4030_usb_read(twl, PHY_CLK_CTRL);
 672         if (val >= 0) {
 673                 val |= PHY_CLK_CTRL_CLOCKGATING_EN;
 674                 val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
 675                 twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
 676         }
 677
 678         /* disable complete OTG block */
 679         twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 680
 681         twl4030_phy_power(twl, 0);
 682         regulator_put(twl->usb1v5);
 683         regulator_put(twl->usb1v8);
 684         regulator_put(twl->usb3v1);
 685
 686         kfree(twl);
 687
 688         return 0;
 689 }
 690
 691 static struct platform_driver twl4030_usb_driver = {
 692         .probe          = twl4030_usb_probe,
 693         .remove         = __exit_p(twl4030_usb_remove),
 694         .driver         = {
 695                 .name   = "twl4030_usb",
 696                 .owner  = THIS_MODULE,
 697         },
 698 };
 699
 700 static int __init twl4030_usb_init(void)
 701 {
 702         return platform_driver_register(&twl4030_usb_driver);
 703 }
 704 subsys_initcall(twl4030_usb_init);
 705
 706 static void __exit twl4030_usb_exit(void)
 707 {
 708         platform_driver_unregister(&twl4030_usb_driver);
 709 }
 710 module_exit(twl4030_usb_exit);
 711
 712 MODULE_ALIAS("platform:twl4030_usb");
 713 MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
 714 MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
 715 MODULE_LICENSE("GPL");