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 otg_transceiver  otg;
  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 xceiv_to_twl(x)         container_of((x), struct twl6030_usb, otg)
 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 otg_transceiver *x)
 141 {
 142         struct twl6030_usb *twl;
 143         struct device *dev;
 144         struct twl4030_usb_data *pdata;
 145
 146         twl = xceiv_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 otg_transceiver *x)
 159 {
 160         struct twl6030_usb *twl;
 161         struct device *dev;
 162         struct twl4030_usb_data *pdata;
 163
 164         twl = xceiv_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 otg_transceiver *x, int suspend)
 171 {
 172         struct twl6030_usb *twl = xceiv_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 otg_transceiver *x)
 182 {
 183         struct twl6030_usb *twl = xceiv_to_twl(x);
 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         int status;
 260         u8 vbus_state, hw_state;
 261
 262         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 263
 264         vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
 265                                                 CONTROLLER_STAT1);
 266         if (!(hw_state & STS_USB_ID)) {
 267                 if (vbus_state & VBUS_DET) {
 268                         regulator_enable(twl->usb3v3);
 269                         twl->asleep = 1;
 270                         status = USB_EVENT_VBUS;
 271                         twl->otg.default_a = false;
 272                         twl->otg.state = OTG_STATE_B_IDLE;
 273                         twl->linkstat = status;
 274                         twl->otg.last_event = status;
 275                         atomic_notifier_call_chain(&twl->otg.notifier,
 276                                                 status, twl->otg.gadget);
 277                 } else {
 278                         status = USB_EVENT_NONE;
 279                         twl->linkstat = status;
 280                         twl->otg.last_event = status;
 281                         atomic_notifier_call_chain(&twl->otg.notifier,
 282                                                 status, twl->otg.gadget);
 283                         if (twl->asleep) {
 284                                 regulator_disable(twl->usb3v3);
 285                                 twl->asleep = 0;
 286                         }
 287                 }
 288         }
 289         sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 290
 291         return IRQ_HANDLED;
 292 }
 293
 294 static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 295 {
 296         struct twl6030_usb *twl = _twl;
 297         int status = USB_EVENT_NONE;
 298         u8 hw_state;
 299
 300         hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
 301
 302         if (hw_state & STS_USB_ID) {
 303
 304                 regulator_enable(twl->usb3v3);
 305                 twl->asleep = 1;
 306                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
 307                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
 308                                                                 0x10);
 309                 status = USB_EVENT_ID;
 310                 twl->otg.default_a = true;
 311                 twl->otg.state = OTG_STATE_A_IDLE;
 312                 twl->linkstat = status;
 313                 twl->otg.last_event = status;
 314                 atomic_notifier_call_chain(&twl->otg.notifier, status,
 315                                                         twl->otg.gadget);
 316         } else  {
 317                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
 318                                                                 0x10);
 319                 twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
 320                                                                 0x1);
 321         }
 322         twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
 323
 324         return IRQ_HANDLED;
 325 }
 326
 327 static int twl6030_set_peripheral(struct otg_transceiver *x,
 328                 struct usb_gadget *gadget)
 329 {
 330         struct twl6030_usb *twl;
 331
 332         if (!x)
 333                 return -ENODEV;
 334
 335         twl = xceiv_to_twl(x);
 336         twl->otg.gadget = gadget;
 337         if (!gadget)
 338                 twl->otg.state = OTG_STATE_UNDEFINED;
 339
 340         return 0;
 341 }
 342
 343 static int twl6030_enable_irq(struct otg_transceiver *x)
 344 {
 345         struct twl6030_usb *twl = xceiv_to_twl(x);
 346
 347         twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
 348         twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
 349         twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
 350
 351         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 352                                 REG_INT_MSK_LINE_C);
 353         twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
 354                                 REG_INT_MSK_STS_C);
 355         twl6030_usb_irq(twl->irq2, twl);
 356         twl6030_usbotg_irq(twl->irq1, twl);
 357
 358         return 0;
 359 }
 360
 361 static void otg_set_vbus_work(struct work_struct *data)
 362 {
 363         struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
 364                                                                 set_vbus_work);
 365
 366         /*
 367          * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
 368          * register. This enables boost mode.
 369          */
 370
 371         if (twl->vbus_enable)
 372                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
 373                                                         CHARGERUSB_CTRL1);
 374         else
 375                 twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
 376                                                         CHARGERUSB_CTRL1);
 377 }
 378
 379 static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
 380 {
 381         struct twl6030_usb *twl = xceiv_to_twl(x);
 382
 383         twl->vbus_enable = enabled;
 384         schedule_work(&twl->set_vbus_work);
 385
 386         return 0;
 387 }
 388
 389 static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host)
 390 {
 391         struct twl6030_usb *twl;
 392
 393         if (!x)
 394                 return -ENODEV;
 395
 396         twl = xceiv_to_twl(x);
 397         twl->otg.host = host;
 398         if (!host)
 399                 twl->otg.state = OTG_STATE_UNDEFINED;
 400         return 0;
 401 }
 402
 403 static int __devinit twl6030_usb_probe(struct platform_device *pdev)
 404 {
 405         struct twl6030_usb      *twl;
 406         int                     status, err;
 407         struct twl4030_usb_data *pdata;
 408         struct device *dev = &pdev->dev;
 409         pdata = dev->platform_data;
 410
 411         twl = kzalloc(sizeof *twl, GFP_KERNEL);
 412         if (!twl)
 413                 return -ENOMEM;
 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         twl->otg.dev            = twl->dev;
 420         twl->otg.label          = "twl6030";
 421         twl->otg.set_host       = twl6030_set_host;
 422         twl->otg.set_peripheral = twl6030_set_peripheral;
 423         twl->otg.set_vbus       = twl6030_set_vbus;
 424         twl->otg.init           = twl6030_phy_init;
 425         twl->otg.shutdown       = twl6030_phy_shutdown;
 426         twl->otg.set_suspend    = twl6030_phy_suspend;
 427         twl->otg.start_srp      = twl6030_start_srp;
 428
 429         /* init spinlock for workqueue */
 430         spin_lock_init(&twl->lock);
 431
 432         err = twl6030_usb_ldo_init(twl);
 433         if (err) {
 434                 dev_err(&pdev->dev, "ldo init failed\n");
 435                 kfree(twl);
 436                 return err;
 437         }
 438         otg_set_transceiver(&twl->otg);
 439
 440         platform_set_drvdata(pdev, twl);
 441         if (device_create_file(&pdev->dev, &dev_attr_vbus))
 442                 dev_warn(&pdev->dev, "could not create sysfs file\n");
 443
 444         ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
 445
 446         INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 447
 448         twl->irq_enabled = true;
 449         status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 450                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 451                         "twl6030_usb", twl);
 452         if (status < 0) {
 453                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 454                         twl->irq1, status);
 455                 device_remove_file(twl->dev, &dev_attr_vbus);
 456                 kfree(twl);
 457                 return status;
 458         }
 459
 460         status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
 461                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 462                         "twl6030_usb", twl);
 463         if (status < 0) {
 464                 dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
 465                         twl->irq2, status);
 466                 free_irq(twl->irq1, twl);
 467                 device_remove_file(twl->dev, &dev_attr_vbus);
 468                 kfree(twl);
 469                 return status;
 470         }
 471
 472         twl->asleep = 0;
 473         pdata->phy_init(dev);
 474         twl6030_phy_suspend(&twl->otg, 0);
 475         twl6030_enable_irq(&twl->otg);
 476         dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
 477
 478         return 0;
 479 }
 480
 481 static int __exit twl6030_usb_remove(struct platform_device *pdev)
 482 {
 483         struct twl6030_usb *twl = platform_get_drvdata(pdev);
 484
 485         struct twl4030_usb_data *pdata;
 486         struct device *dev = &pdev->dev;
 487         pdata = dev->platform_data;
 488
 489         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 490                 REG_INT_MSK_LINE_C);
 491         twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
 492                         REG_INT_MSK_STS_C);
 493         free_irq(twl->irq1, twl);
 494         free_irq(twl->irq2, twl);
 495         regulator_put(twl->usb3v3);
 496         pdata->phy_exit(twl->dev);
 497         device_remove_file(twl->dev, &dev_attr_vbus);
 498         cancel_work_sync(&twl->set_vbus_work);
 499         kfree(twl);
 500
 501         return 0;
 502 }
 503
 504 static struct platform_driver twl6030_usb_driver = {
 505         .probe          = twl6030_usb_probe,
 506         .remove         = __exit_p(twl6030_usb_remove),
 507         .driver         = {
 508                 .name   = "twl6030_usb",
 509                 .owner  = THIS_MODULE,
 510         },
 511 };
 512
 513 static int __init twl6030_usb_init(void)
 514 {
 515         return platform_driver_register(&twl6030_usb_driver);
 516 }
 517 subsys_initcall(twl6030_usb_init);
 518
 519 static void __exit twl6030_usb_exit(void)
 520 {
 521         platform_driver_unregister(&twl6030_usb_driver);
 522 }
 523 module_exit(twl6030_usb_exit);
 524
 525 MODULE_ALIAS("platform:twl6030_usb");
 526 MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
 527 MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
 528 MODULE_LICENSE("GPL");