drivers/usb/otg/twl6030-usb.c

   1 /*
   2  * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Author: Hema HK <hemahk@ti.com>
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/io.h>
  28 #include <linux/usb/otg.h>
  29 #include <linux/i2c/twl.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/err.h>
  32 #include <linux/notifier.h>
  33 #include <linux/slab.h>
  34 #include <linux/delay.h>
  35
  36 /* usb register definitions */
  37 #define USB_VENDOR_ID_LSB               0x00
  38 #define USB_VENDOR_ID_MSB               0x01
  39 #define USB_PRODUCT_ID_LSB              0x02
  40 #define USB_PRODUCT_ID_MSB              0x03
  41 #define USB_VBUS_CTRL_SET               0x04
  42 #define USB_VBUS_CTRL_CLR               0x05
  43 #define USB_ID_CTRL_SET                 0x06
  44 #define USB_ID_CTRL_CLR                 0x07
  45 #define USB_VBUS_INT_SRC                0x08
  46 #define USB_VBUS_INT_LATCH_SET          0x09
  47 #define USB_VBUS_INT_LATCH_CLR          0x0A
  48 #define USB_VBUS_INT_EN_LO_SET          0x0B
  49 #define USB_VBUS_INT_EN_LO_CLR          0x0C
  50 #define USB_VBUS_INT_EN_HI_SET          0x0D
  51 #define USB_VBUS_INT_EN_HI_CLR          0x0E
  52 #define USB_ID_INT_SRC                  0x0F
  53 #define USB_ID_INT_LATCH_SET            0x10
  54 #define USB_ID_INT_LATCH_CLR            0x11
  55
  56 #define USB_ID_INT_EN_LO_SET            0x12
  57 #define USB_ID_INT_EN_LO_CLR            0x13
  58 #define USB_ID_INT_EN_HI_SET            0x14
  59 #define USB_ID_INT_EN_HI_CLR            0x15
  60 #define USB_OTG_ADP_CTRL                0x16
  61 #define USB_OTG_ADP_HIGH                0x17
  62 #define USB_OTG_ADP_LOW                 0x18
  63 #define USB_OTG_ADP_RISE                0x19
  64 #define USB_OTG_REVISION                0x1A
  65
  66 /* to be moved to LDO */
  67 #define TWL6030_MISC2                   0xE5
  68 #define TWL6030_CFG_LDO_PD2             0xF5
  69 #define TWL6030_BACKUP_REG              0xFA
  70
  71 #define STS_HW_CONDITIONS               0x21
  72
  73 /* In module TWL6030_MODULE_PM_MASTER */
  74 #define STS_HW_CONDITIONS               0x21
  75 #define STS_USB_ID                      BIT(2)
  76
  77 /* In module TWL6030_MODULE_PM_RECEIVER */
  78 #define VUSB_CFG_TRANS                  0x71
  79 #define VUSB_CFG_STATE                  0x72
  80 #define VUSB_CFG_VOLTAGE                0x73
  81
  82 /* in module TWL6030_MODULE_MAIN_CHARGE */
  83
  84 #define CHARGERUSB_CTRL1                0x8
  85
  86 #define CONTROLLER_STAT1                0x03
  87 #define VBUS_DET                        BIT(2)
  88
  89 struct twl6030_usb {
  90         struct usb_phy          phy;
  91         struct device           *dev;
  92
  93         /* for vbus reporting with irqs disabled */
  94         spinlock_t              lock;
  95
  96         struct regulator                *usb3v3;
  97
  98         /* used to set vbus, in atomic path */
  99         struct work_struct      set_vbus_work;
 100
 101         int                     irq1;
 102         int                     irq2;
 103         u8                      linkstat;
 104         u8                      asleep;
 105         bool                    irq_enabled;
 106         bool                    vbus_enable;
 107         unsigned long           features;
 108 };
 109
 110 #define phy_to_twl(x)           container_of((x), struct twl6030_usb, phy)
 111
 112 /*-------------------------------------------------------------------------*/
 113
 114 static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
 115                                                 u8 data, u8 address)
 116 {
 117         int ret = 0;
 118
 119         ret = twl_i2c_write_u8(module, data, address);
 120         if (ret < 0)
 121                 dev_err(twl->dev,
 122                         "Write[0x%x] Error %d\n", address, ret);
 123         return ret;
 124 }
 125
 126 static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
 127 {
 128         u8 data, ret = 0;
 129
 130         ret = twl_i2c_read_u8(module, &data, address);
 131         if (ret >= 0)
 132                 ret = data;
 133         else
 134                 dev_err(twl->dev,
 135                         "readb[0x%x,0x%x] Error %d\n",
 136                                         module, address, ret);
 137         return ret;
 138 }
 139
 140 static int twl6030_phy_init(struct usb_phy *x)
 141 {
 142         struct twl6030_usb *twl;
 143         struct device *dev;
 144         struct twl4030_usb_data *pdata;
 145
 146         twl = phy_to_twl(x);
 147         dev  = twl->dev;
 148         pdata = dev->platform_data;
 149
 150         if (twl->linkstat == USB_EVENT_ID)
 151                 pdata->phy_power(twl->dev, 1, 1);
 152         else
 153                 pdata->phy_power(twl->dev, 0, 1);
 154
 155         return 0;
 156 }
 157
 158 static void twl6030_phy_shutdown(struct usb_phy *x)
 159 {
 160         struct twl6030_usb *twl;
 161         struct device *dev;
 162         struct twl4030_usb_data *pdata;
 163
 164         twl = phy_to_twl(x);
 165         dev  = twl->dev;
 166         pdata = dev->platform_data;
 167         pdata->phy_power(twl->dev, 0, 0);
 168 }
 169
 170 static int twl6030_phy_suspend(struct usb_phy *x, int suspend)
 171 {
 172         struct twl6030_usb *twl = phy_to_twl(x);
 173         struct device *dev = twl->dev;
 174         struct twl4030_usb_data *pdata = dev->platform_data;
 175
 176         pdata->phy_suspend(dev, suspend);
 177
 178         return 0;
 179 }
 180
 181 static int twl6030_start_srp(struct usb_otg *otg)
 182 {
 183         struct twl6030_usb *twl = phy_to_twl(otg->phy);
 184
 185         twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
 186         twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
 187
 188         mdelay(100);
 189         twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
 190
 191         return 0;
 192 }
 193
 194 static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
 195 {
 196         char *regulator_name;
 197
 198         if (twl->features & TWL6025_SUBCLASS)
 199                 regulator_name = "ldousb";
 200         else
 201                 regulator_name = "vusb";
 202
 203         /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
 204         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
 205
 206         /* Program CFG_LDO_PD2 register and set VUSB bit */
 207         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
 208
 209         /* Program MISC2 register and set bit VUSB_IN_VBAT */
 210         twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
 211
 212         twl->usb3v3 = regulator_get(twl->dev, regulator_name);
 213         if (IS_ERR(twl->usb3v3))
 214                 return -ENODEV;
 215
 216         /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
 217         twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
 218
 219         /*
 220          * Program the USB_ID_CTRL_SET register to enable GND drive
 221          * and the ID comparators
 222          */
 223         twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
 224
 225         return 0;
 226 }
 227
 228 static ssize_t twl6030_usb_vbus_show(struct device *dev,
 229                         struct device_attribute *attr, char *buf)
 230 {
 231         struct twl6030_usb *twl = dev_get_drvdata(dev);
 232         unsigned long flags;
 233         int ret = -EINVAL;
 234
 235         spin_lock_irqsave(&twl->lock, flags);
 236
 237         switch (twl->linkstat) {
 238         case USB_EVENT_VBUS:
 239                ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 240                break;
 241         case USB_EVENT_ID:
 242                ret = snprintf(buf, PAGE_SIZE, "id\n");
 243                break;
 244         case USB_EVENT_NONE:
 245                ret = snprintf(buf, PAGE_SIZE, "none\n");
 246                break;
 247         default:
 248                ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
 249         }
 250         spin_unlock_irqrestore(&twl->lock, flags);
 251
 252         return ret;
 253 }
 254 static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
 255
 256 static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 257 {
 258         struct twl6030_usb *twl = _twl;
 259         struct usb_otg *otg = twl->phy.otg;
 260         int status;
 261         u8 vbus_state, hw_state;
 262
 263         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 264
 265         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 266                                                 CONTROLLER_STAT1);
 267         if (!(hw_state & STS_USB_ID)) {
 268                 if (vbus_state & VBUS_DET) {
 269                         regulator_enable(twl->usb3v3);
 270                         twl->asleep = 1;
 271                         status = USB_EVENT_VBUS;
 272                         otg->default_a = false;
 273                         twl->phy.state = OTG_STATE_B_IDLE;
 274                         twl->linkstat = status;
 275                         twl->phy.last_event = status;
 276                         atomic_notifier_call_chain(&twl->phy.notifier,
 277                                                 status, otg->gadget);
 278                 } else {
 279                         status = USB_EVENT_NONE;
 280                         twl->linkstat = status;
 281                         twl->phy.last_event = status;
 282                         atomic_notifier_call_chain(&twl->phy.notifier,
 283                                                 status, otg->gadget);
 284                         if (twl->asleep) {
 285                                 regulator_disable(twl->usb3v3);
 286                                 twl->asleep = 0;
 287                         }
 288                 }
 289         }
 290         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 296 {
 297         struct twl6030_usb *twl = _twl;
 298         struct usb_otg *otg = twl->phy.otg;
 299         int status = USB_EVENT_NONE;
 300         u8 hw_state;
 301
 302         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 303
 304         if (hw_state & STS_USB_ID) {
 305
 306                 regulator_enable(twl->usb3v3);
 307                 twl->asleep = 1;
 308                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
 309                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
 310                 status = USB_EVENT_ID;
 311                 otg->default_a = true;
 312                 twl->phy.state = OTG_STATE_A_IDLE;
 313                 twl->linkstat = status;
 314                 twl->phy.last_event = status;
 315                 atomic_notifier_call_chain(&twl->phy.notifier, status,
 316                                                         otg->gadget);
 317         } else  {
 318                 twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
 319                 twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 320         }
 321         twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
 322
 323         return IRQ_HANDLED;
 324 }
 325
 326 static int twl6030_set_peripheral(struct usb_otg *otg,
 327                 struct usb_gadget *gadget)
 328 {
 329         if (!otg)
 330                 return -ENODEV;
 331
 332         otg->gadget = gadget;
 333         if (!gadget)
 334                 otg->phy->state = OTG_STATE_UNDEFINED;
 335
 336         return 0;
 337 }
 338
 339 static int twl6030_enable_irq(struct usb_phy *x)
 340 {
 341         struct twl6030_usb *twl = phy_to_twl(x);
 342
 343         twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
 344         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 345         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
 346
 347         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 348                                 REG_INT_MSK_LINE_C);
 349         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 350                                 REG_INT_MSK_STS_C);
 351         twl6030_usb_irq(twl->irq2, twl);
 352         twl6030_usbotg_irq(twl->irq1, twl);
 353
 354         return 0;
 355 }
 356
 357 static void otg_set_vbus_work(struct work_struct *data)
 358 {
 359         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
 360                                                                 set_vbus_work);
 361
 362         /*
 363          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 364          * register. This enables boost mode.
 365          */
 366
 367         if (twl->vbus_enable)
 368                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
 369                                                         CHARGERUSB_CTRL1);
 370         else
 371                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
 372                                                         CHARGERUSB_CTRL1);
 373 }
 374
 375 static int twl6030_set_vbus(struct usb_otg *otg, bool enabled)
 376 {
 377         struct twl6030_usb *twl = phy_to_twl(otg->phy);
 378
 379         twl->vbus_enable = enabled;
 380         schedule_work(&twl->set_vbus_work);
 381
 382         return 0;
 383 }
 384
 385 static int twl6030_set_host(struct usb_otg *otg, struct usb_bus *host)
 386 {
 387         if (!otg)
 388                 return -ENODEV;
 389
 390         otg->host = host;
 391         if (!host)
 392                 otg->phy->state = OTG_STATE_UNDEFINED;
 393         return 0;
 394 }
 395
 396 static int __devinit twl6030_usb_probe(struct platform_device *pdev)
 397 {
 398         struct twl6030_usb      *twl;
 399         int                     status, err;
 400         struct twl4030_usb_data *pdata;
 401         struct usb_otg          *otg;
 402         struct device *dev = &pdev->dev;
 403         pdata = dev->platform_data;
 404
 405         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 406         if (!twl)
 407                 return -ENOMEM;
 408
 409         otg = kzalloc(sizeof *otg, GFP_KERNEL);
 410         if (!otg) {
 411                 kfree(twl);
 412                 return -ENOMEM;
 413         }
 414
 415         twl->dev                = &pdev->dev;
 416         twl->irq1               = platform_get_irq(pdev, 0);
 417         twl->irq2               = platform_get_irq(pdev, 1);
 418         twl->features           = pdata->features;
 419
 420         twl->phy.dev            = twl->dev;
 421         twl->phy.label          = "twl6030";
 422         twl->phy.otg            = otg;
 423         twl->phy.init           = twl6030_phy_init;
 424         twl->phy.shutdown       = twl6030_phy_shutdown;
 425         twl->phy.set_suspend    = twl6030_phy_suspend;
 426
 427         otg->phy                = &twl->phy;
 428         otg->set_host           = twl6030_set_host;
 429         otg->set_peripheral     = twl6030_set_peripheral;
 430         otg->set_vbus           = twl6030_set_vbus;
 431         otg->start_srp          = twl6030_start_srp;
 432
 433         /* init spinlock for workqueue */
 434         spin_lock_init(&twl->lock);
 435
 436         err = twl6030_usb_ldo_init(twl);
 437         if (err) {
 438                 dev_err(&pdev->dev, "ldo init failed\n");
 439                 kfree(otg);
 440                 kfree(twl);
 441                 return err;
 442         }
 443         usb_set_transceiver(&twl->phy);
 444
 445         platform_set_drvdata(pdev, twl);
 446         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 447                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 448
 449         ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
 450
 451         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 452
 453         twl->irq_enabled = true;
 454         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 455                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 456                         "twl6030_usb", twl);
 457         if (status < 0) {
 458                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 459                         twl->irq1, status);
 460                 device_remove_file(twl->dev, &dev_attr_vbus);
 461                 kfree(otg);
 462                 kfree(twl);
 463                 return status;
 464         }
 465
 466         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 467                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 468                         "twl6030_usb", twl);
 469         if (status < 0) {
 470                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 471                         twl->irq2, status);
 472                 free_irq(twl->irq1, twl);
 473                 device_remove_file(twl->dev, &dev_attr_vbus);
 474                 kfree(otg);
 475                 kfree(twl);
 476                 return status;
 477         }
 478
 479         twl->asleep = 0;
 480         pdata->phy_init(dev);
 481         twl6030_phy_suspend(&twl->phy, 0);
 482         twl6030_enable_irq(&twl->phy);
 483         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
 484
 485         return 0;
 486 }
 487
 488 static int __exit twl6030_usb_remove(struct platform_device *pdev)
 489 {
 490         struct twl6030_usb *twl = platform_get_drvdata(pdev);
 491
 492         struct twl4030_usb_data *pdata;
 493         struct device *dev = &pdev->dev;
 494         pdata = dev->platform_data;
 495
 496         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 497                 REG_INT_MSK_LINE_C);
 498         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 499                         REG_INT_MSK_STS_C);
 500         free_irq(twl->irq1, twl);
 501         free_irq(twl->irq2, twl);
 502         regulator_put(twl->usb3v3);
 503         pdata->phy_exit(twl->dev);
 504         device_remove_file(twl->dev, &dev_attr_vbus);
 505         cancel_work_sync(&twl->set_vbus_work);
 506         kfree(twl->phy.otg);
 507         kfree(twl);
 508
 509         return 0;
 510 }
 511
 512 static struct platform_driver twl6030_usb_driver = {
 513         .probe          = twl6030_usb_probe,
 514         .remove         = __exit_p(twl6030_usb_remove),
 515         .driver         = {
 516                 .name   = "twl6030_usb",
 517                 .owner  = THIS_MODULE,
 518         },
 519 };
 520
 521 static int __init twl6030_usb_init(void)
 522 {
 523         return platform_driver_register(&twl6030_usb_driver);
 524 }
 525 subsys_initcall(twl6030_usb_init);
 526
 527 static void __exit twl6030_usb_exit(void)
 528 {
 529         platform_driver_unregister(&twl6030_usb_driver);
 530 }
 531 module_exit(twl6030_usb_exit);
 532
 533 MODULE_ALIAS("platform:twl6030_usb");
 534 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 535 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 536 MODULE_LICENSE("GPL");