linux/drivers/watchdog/cpwd.c
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   1/* cpwd.c - driver implementation for hardware watchdog
   2 * timers found on Sun Microsystems CP1400 and CP1500 boards.
   3 *
   4 * This device supports both the generic Linux watchdog
   5 * interface and Solaris-compatible ioctls as best it is
   6 * able.
   7 *
   8 * NOTE:        CP1400 systems appear to have a defective intr_mask
   9 *                      register on the PLD, preventing the disabling of
  10 *                      timer interrupts.  We use a timer to periodically
  11 *                      reset 'stopped' watchdogs on affected platforms.
  12 *
  13 * Copyright (c) 2000 Eric Brower (ebrower@usa.net)
  14 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
  15 */
  16
  17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/fs.h>
  22#include <linux/errno.h>
  23#include <linux/major.h>
  24#include <linux/init.h>
  25#include <linux/miscdevice.h>
  26#include <linux/interrupt.h>
  27#include <linux/ioport.h>
  28#include <linux/timer.h>
  29#include <linux/slab.h>
  30#include <linux/mutex.h>
  31#include <linux/io.h>
  32#include <linux/of.h>
  33#include <linux/of_device.h>
  34#include <linux/uaccess.h>
  35
  36#include <asm/irq.h>
  37#include <asm/watchdog.h>
  38
  39#define DRIVER_NAME     "cpwd"
  40
  41#define WD_OBPNAME      "watchdog"
  42#define WD_BADMODEL     "SUNW,501-5336"
  43#define WD_BTIMEOUT     (jiffies + (HZ * 1000))
  44#define WD_BLIMIT       0xFFFF
  45
  46#define WD0_MINOR       212
  47#define WD1_MINOR       213
  48#define WD2_MINOR       214
  49
  50/* Internal driver definitions.  */
  51#define WD0_ID                  0
  52#define WD1_ID                  1
  53#define WD2_ID                  2
  54#define WD_NUMDEVS              3
  55
  56#define WD_INTR_OFF             0
  57#define WD_INTR_ON              1
  58
  59#define WD_STAT_INIT    0x01    /* Watchdog timer is initialized        */
  60#define WD_STAT_BSTOP   0x02    /* Watchdog timer is brokenstopped      */
  61#define WD_STAT_SVCD    0x04    /* Watchdog interrupt occurred          */
  62
  63/* Register value definitions
  64 */
  65#define WD0_INTR_MASK   0x01    /* Watchdog device interrupt masks      */
  66#define WD1_INTR_MASK   0x02
  67#define WD2_INTR_MASK   0x04
  68
  69#define WD_S_RUNNING    0x01    /* Watchdog device status running       */
  70#define WD_S_EXPIRED    0x02    /* Watchdog device status expired       */
  71
  72struct cpwd {
  73        void __iomem    *regs;
  74        spinlock_t      lock;
  75
  76        unsigned int    irq;
  77
  78        unsigned long   timeout;
  79        bool            enabled;
  80        bool            reboot;
  81        bool            broken;
  82        bool            initialized;
  83
  84        struct {
  85                struct miscdevice       misc;
  86                void __iomem            *regs;
  87                u8                      intr_mask;
  88                u8                      runstatus;
  89                u16                     timeout;
  90        } devs[WD_NUMDEVS];
  91};
  92
  93static DEFINE_MUTEX(cpwd_mutex);
  94static struct cpwd *cpwd_device;
  95
  96/* Sun uses Altera PLD EPF8820ATC144-4
  97 * providing three hardware watchdogs:
  98 *
  99 * 1) RIC - sends an interrupt when triggered
 100 * 2) XIR - asserts XIR_B_RESET when triggered, resets CPU
 101 * 3) POR - asserts POR_B_RESET when triggered, resets CPU, backplane, board
 102 *
 103 *** Timer register block definition (struct wd_timer_regblk)
 104 *
 105 * dcntr and limit registers (halfword access):
 106 * -------------------
 107 * | 15 | ...| 1 | 0 |
 108 * -------------------
 109 * |-  counter val  -|
 110 * -------------------
 111 * dcntr -      Current 16-bit downcounter value.
 112 *                      When downcounter reaches '0' watchdog expires.
 113 *                      Reading this register resets downcounter with
 114 *                      'limit' value.
 115 * limit -      16-bit countdown value in 1/10th second increments.
 116 *                      Writing this register begins countdown with input value.
 117 *                      Reading from this register does not affect counter.
 118 * NOTES:       After watchdog reset, dcntr and limit contain '1'
 119 *
 120 * status register (byte access):
 121 * ---------------------------
 122 * | 7 | ... | 2 |  1  |  0  |
 123 * --------------+------------
 124 * |-   UNUSED  -| EXP | RUN |
 125 * ---------------------------
 126 * status-      Bit 0 - Watchdog is running
 127 *                      Bit 1 - Watchdog has expired
 128 *
 129 *** PLD register block definition (struct wd_pld_regblk)
 130 *
 131 * intr_mask register (byte access):
 132 * ---------------------------------
 133 * | 7 | ... | 3 |  2  |  1  |  0  |
 134 * +-------------+------------------
 135 * |-   UNUSED  -| WD3 | WD2 | WD1 |
 136 * ---------------------------------
 137 * WD3 -  1 == Interrupt disabled for watchdog 3
 138 * WD2 -  1 == Interrupt disabled for watchdog 2
 139 * WD1 -  1 == Interrupt disabled for watchdog 1
 140 *
 141 * pld_status register (byte access):
 142 * UNKNOWN, MAGICAL MYSTERY REGISTER
 143 *
 144 */
 145#define WD_TIMER_REGSZ  16
 146#define WD0_OFF         0
 147#define WD1_OFF         (WD_TIMER_REGSZ * 1)
 148#define WD2_OFF         (WD_TIMER_REGSZ * 2)
 149#define PLD_OFF         (WD_TIMER_REGSZ * 3)
 150
 151#define WD_DCNTR        0x00
 152#define WD_LIMIT        0x04
 153#define WD_STATUS       0x08
 154
 155#define PLD_IMASK       (PLD_OFF + 0x00)
 156#define PLD_STATUS      (PLD_OFF + 0x04)
 157
 158static struct timer_list cpwd_timer;
 159
 160static int wd0_timeout;
 161static int wd1_timeout;
 162static int wd2_timeout;
 163
 164module_param(wd0_timeout, int, 0);
 165MODULE_PARM_DESC(wd0_timeout, "Default watchdog0 timeout in 1/10secs");
 166module_param(wd1_timeout, int, 0);
 167MODULE_PARM_DESC(wd1_timeout, "Default watchdog1 timeout in 1/10secs");
 168module_param(wd2_timeout, int, 0);
 169MODULE_PARM_DESC(wd2_timeout, "Default watchdog2 timeout in 1/10secs");
 170
 171MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
 172MODULE_DESCRIPTION("Hardware watchdog driver for Sun Microsystems CP1400/1500");
 173MODULE_LICENSE("GPL");
 174MODULE_SUPPORTED_DEVICE("watchdog");
 175
 176static void cpwd_writew(u16 val, void __iomem *addr)
 177{
 178        writew(cpu_to_le16(val), addr);
 179}
 180static u16 cpwd_readw(void __iomem *addr)
 181{
 182        u16 val = readw(addr);
 183
 184        return le16_to_cpu(val);
 185}
 186
 187static void cpwd_writeb(u8 val, void __iomem *addr)
 188{
 189        writeb(val, addr);
 190}
 191
 192static u8 cpwd_readb(void __iomem *addr)
 193{
 194        return readb(addr);
 195}
 196
 197/* Enable or disable watchdog interrupts
 198 * Because of the CP1400 defect this should only be
 199 * called during initialzation or by wd_[start|stop]timer()
 200 *
 201 * index        - sub-device index, or -1 for 'all'
 202 * enable       - non-zero to enable interrupts, zero to disable
 203 */
 204static void cpwd_toggleintr(struct cpwd *p, int index, int enable)
 205{
 206        unsigned char curregs = cpwd_readb(p->regs + PLD_IMASK);
 207        unsigned char setregs =
 208                (index == -1) ?
 209                (WD0_INTR_MASK | WD1_INTR_MASK | WD2_INTR_MASK) :
 210                (p->devs[index].intr_mask);
 211
 212        if (enable == WD_INTR_ON)
 213                curregs &= ~setregs;
 214        else
 215                curregs |= setregs;
 216
 217        cpwd_writeb(curregs, p->regs + PLD_IMASK);
 218}
 219
 220/* Restarts timer with maximum limit value and
 221 * does not unset 'brokenstop' value.
 222 */
 223static void cpwd_resetbrokentimer(struct cpwd *p, int index)
 224{
 225        cpwd_toggleintr(p, index, WD_INTR_ON);
 226        cpwd_writew(WD_BLIMIT, p->devs[index].regs + WD_LIMIT);
 227}
 228
 229/* Timer method called to reset stopped watchdogs--
 230 * because of the PLD bug on CP1400, we cannot mask
 231 * interrupts within the PLD so me must continually
 232 * reset the timers ad infinitum.
 233 */
 234static void cpwd_brokentimer(unsigned long data)
 235{
 236        struct cpwd *p = (struct cpwd *) data;
 237        int id, tripped = 0;
 238
 239        /* kill a running timer instance, in case we
 240         * were called directly instead of by kernel timer
 241         */
 242        if (timer_pending(&cpwd_timer))
 243                del_timer(&cpwd_timer);
 244
 245        for (id = 0; id < WD_NUMDEVS; id++) {
 246                if (p->devs[id].runstatus & WD_STAT_BSTOP) {
 247                        ++tripped;
 248                        cpwd_resetbrokentimer(p, id);
 249                }
 250        }
 251
 252        if (tripped) {
 253                /* there is at least one timer brokenstopped-- reschedule */
 254                cpwd_timer.expires = WD_BTIMEOUT;
 255                add_timer(&cpwd_timer);
 256        }
 257}
 258
 259/* Reset countdown timer with 'limit' value and continue countdown.
 260 * This will not start a stopped timer.
 261 */
 262static void cpwd_pingtimer(struct cpwd *p, int index)
 263{
 264        if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING)
 265                cpwd_readw(p->devs[index].regs + WD_DCNTR);
 266}
 267
 268/* Stop a running watchdog timer-- the timer actually keeps
 269 * running, but the interrupt is masked so that no action is
 270 * taken upon expiration.
 271 */
 272static void cpwd_stoptimer(struct cpwd *p, int index)
 273{
 274        if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING) {
 275                cpwd_toggleintr(p, index, WD_INTR_OFF);
 276
 277                if (p->broken) {
 278                        p->devs[index].runstatus |= WD_STAT_BSTOP;
 279                        cpwd_brokentimer((unsigned long) p);
 280                }
 281        }
 282}
 283
 284/* Start a watchdog timer with the specified limit value
 285 * If the watchdog is running, it will be restarted with
 286 * the provided limit value.
 287 *
 288 * This function will enable interrupts on the specified
 289 * watchdog.
 290 */
 291static void cpwd_starttimer(struct cpwd *p, int index)
 292{
 293        if (p->broken)
 294                p->devs[index].runstatus &= ~WD_STAT_BSTOP;
 295
 296        p->devs[index].runstatus &= ~WD_STAT_SVCD;
 297
 298        cpwd_writew(p->devs[index].timeout, p->devs[index].regs + WD_LIMIT);
 299        cpwd_toggleintr(p, index, WD_INTR_ON);
 300}
 301
 302static int cpwd_getstatus(struct cpwd *p, int index)
 303{
 304        unsigned char stat = cpwd_readb(p->devs[index].regs + WD_STATUS);
 305        unsigned char intr = cpwd_readb(p->devs[index].regs + PLD_IMASK);
 306        unsigned char ret  = WD_STOPPED;
 307
 308        /* determine STOPPED */
 309        if (!stat)
 310                return ret;
 311
 312        /* determine EXPIRED vs FREERUN vs RUNNING */
 313        else if (WD_S_EXPIRED & stat) {
 314                ret = WD_EXPIRED;
 315        } else if (WD_S_RUNNING & stat) {
 316                if (intr & p->devs[index].intr_mask) {
 317                        ret = WD_FREERUN;
 318                } else {
 319                        /* Fudge WD_EXPIRED status for defective CP1400--
 320                         * IF timer is running
 321                         *      AND brokenstop is set
 322                         *      AND an interrupt has been serviced
 323                         * we are WD_EXPIRED.
 324                         *
 325                         * IF timer is running
 326                         *      AND brokenstop is set
 327                         *      AND no interrupt has been serviced
 328                         * we are WD_FREERUN.
 329                         */
 330                        if (p->broken &&
 331                            (p->devs[index].runstatus & WD_STAT_BSTOP)) {
 332                                if (p->devs[index].runstatus & WD_STAT_SVCD) {
 333                                        ret = WD_EXPIRED;
 334                                } else {
 335                                        /* we could as well pretend
 336                                         * we are expired */
 337                                        ret = WD_FREERUN;
 338                                }
 339                        } else {
 340                                ret = WD_RUNNING;
 341                        }
 342                }
 343        }
 344
 345        /* determine SERVICED */
 346        if (p->devs[index].runstatus & WD_STAT_SVCD)
 347                ret |= WD_SERVICED;
 348
 349        return ret;
 350}
 351
 352static irqreturn_t cpwd_interrupt(int irq, void *dev_id)
 353{
 354        struct cpwd *p = dev_id;
 355
 356        /* Only WD0 will interrupt-- others are NMI and we won't
 357         * see them here....
 358         */
 359        spin_lock_irq(&p->lock);
 360
 361        cpwd_stoptimer(p, WD0_ID);
 362        p->devs[WD0_ID].runstatus |=  WD_STAT_SVCD;
 363
 364        spin_unlock_irq(&p->lock);
 365
 366        return IRQ_HANDLED;
 367}
 368
 369static int cpwd_open(struct inode *inode, struct file *f)
 370{
 371        struct cpwd *p = cpwd_device;
 372
 373        mutex_lock(&cpwd_mutex);
 374        switch (iminor(inode)) {
 375        case WD0_MINOR:
 376        case WD1_MINOR:
 377        case WD2_MINOR:
 378                break;
 379
 380        default:
 381                mutex_unlock(&cpwd_mutex);
 382                return -ENODEV;
 383        }
 384
 385        /* Register IRQ on first open of device */
 386        if (!p->initialized) {
 387                if (request_irq(p->irq, &cpwd_interrupt,
 388                                IRQF_SHARED, DRIVER_NAME, p)) {
 389                        pr_err("Cannot register IRQ %d\n", p->irq);
 390                        mutex_unlock(&cpwd_mutex);
 391                        return -EBUSY;
 392                }
 393                p->initialized = true;
 394        }
 395
 396        mutex_unlock(&cpwd_mutex);
 397
 398        return nonseekable_open(inode, f);
 399}
 400
 401static int cpwd_release(struct inode *inode, struct file *file)
 402{
 403        return 0;
 404}
 405
 406static long cpwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 407{
 408        static const struct watchdog_info info = {
 409                .options                = WDIOF_SETTIMEOUT,
 410                .firmware_version       = 1,
 411                .identity               = DRIVER_NAME,
 412        };
 413        void __user *argp = (void __user *)arg;
 414        struct inode *inode = file->f_path.dentry->d_inode;
 415        int index = iminor(inode) - WD0_MINOR;
 416        struct cpwd *p = cpwd_device;
 417        int setopt = 0;
 418
 419        switch (cmd) {
 420        /* Generic Linux IOCTLs */
 421        case WDIOC_GETSUPPORT:
 422                if (copy_to_user(argp, &info, sizeof(struct watchdog_info)))
 423                        return -EFAULT;
 424                break;
 425
 426        case WDIOC_GETSTATUS:
 427        case WDIOC_GETBOOTSTATUS:
 428                if (put_user(0, (int __user *)argp))
 429                        return -EFAULT;
 430                break;
 431
 432        case WDIOC_KEEPALIVE:
 433                cpwd_pingtimer(p, index);
 434                break;
 435
 436        case WDIOC_SETOPTIONS:
 437                if (copy_from_user(&setopt, argp, sizeof(unsigned int)))
 438                        return -EFAULT;
 439
 440                if (setopt & WDIOS_DISABLECARD) {
 441                        if (p->enabled)
 442                                return -EINVAL;
 443                        cpwd_stoptimer(p, index);
 444                } else if (setopt & WDIOS_ENABLECARD) {
 445                        cpwd_starttimer(p, index);
 446                } else {
 447                        return -EINVAL;
 448                }
 449                break;
 450
 451        /* Solaris-compatible IOCTLs */
 452        case WIOCGSTAT:
 453                setopt = cpwd_getstatus(p, index);
 454                if (copy_to_user(argp, &setopt, sizeof(unsigned int)))
 455                        return -EFAULT;
 456                break;
 457
 458        case WIOCSTART:
 459                cpwd_starttimer(p, index);
 460                break;
 461
 462        case WIOCSTOP:
 463                if (p->enabled)
 464                        return -EINVAL;
 465
 466                cpwd_stoptimer(p, index);
 467                break;
 468
 469        default:
 470                return -EINVAL;
 471        }
 472
 473        return 0;
 474}
 475
 476static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
 477                              unsigned long arg)
 478{
 479        int rval = -ENOIOCTLCMD;
 480
 481        switch (cmd) {
 482        /* solaris ioctls are specific to this driver */
 483        case WIOCSTART:
 484        case WIOCSTOP:
 485        case WIOCGSTAT:
 486                mutex_lock(&cpwd_mutex);
 487                rval = cpwd_ioctl(file, cmd, arg);
 488                mutex_unlock(&cpwd_mutex);
 489                break;
 490
 491        /* everything else is handled by the generic compat layer */
 492        default:
 493                break;
 494        }
 495
 496        return rval;
 497}
 498
 499static ssize_t cpwd_write(struct file *file, const char __user *buf,
 500                          size_t count, loff_t *ppos)
 501{
 502        struct inode *inode = file->f_path.dentry->d_inode;
 503        struct cpwd *p = cpwd_device;
 504        int index = iminor(inode);
 505
 506        if (count) {
 507                cpwd_pingtimer(p, index);
 508                return 1;
 509        }
 510
 511        return 0;
 512}
 513
 514static ssize_t cpwd_read(struct file *file, char __user *buffer,
 515                         size_t count, loff_t *ppos)
 516{
 517        return -EINVAL;
 518}
 519
 520static const struct file_operations cpwd_fops = {
 521        .owner =                THIS_MODULE,
 522        .unlocked_ioctl =       cpwd_ioctl,
 523        .compat_ioctl =         cpwd_compat_ioctl,
 524        .open =                 cpwd_open,
 525        .write =                cpwd_write,
 526        .read =                 cpwd_read,
 527        .release =              cpwd_release,
 528        .llseek =               no_llseek,
 529};
 530
 531static int __devinit cpwd_probe(struct platform_device *op)
 532{
 533        struct device_node *options;
 534        const char *str_prop;
 535        const void *prop_val;
 536        int i, err = -EINVAL;
 537        struct cpwd *p;
 538
 539        if (cpwd_device)
 540                return -EINVAL;
 541
 542        p = kzalloc(sizeof(*p), GFP_KERNEL);
 543        err = -ENOMEM;
 544        if (!p) {
 545                pr_err("Unable to allocate struct cpwd\n");
 546                goto out;
 547        }
 548
 549        p->irq = op->archdata.irqs[0];
 550
 551        spin_lock_init(&p->lock);
 552
 553        p->regs = of_ioremap(&op->resource[0], 0,
 554                             4 * WD_TIMER_REGSZ, DRIVER_NAME);
 555        if (!p->regs) {
 556                pr_err("Unable to map registers\n");
 557                goto out_free;
 558        }
 559
 560        options = of_find_node_by_path("/options");
 561        err = -ENODEV;
 562        if (!options) {
 563                pr_err("Unable to find /options node\n");
 564                goto out_iounmap;
 565        }
 566
 567        prop_val = of_get_property(options, "watchdog-enable?", NULL);
 568        p->enabled = (prop_val ? true : false);
 569
 570        prop_val = of_get_property(options, "watchdog-reboot?", NULL);
 571        p->reboot = (prop_val ? true : false);
 572
 573        str_prop = of_get_property(options, "watchdog-timeout", NULL);
 574        if (str_prop)
 575                p->timeout = simple_strtoul(str_prop, NULL, 10);
 576
 577        /* CP1400s seem to have broken PLD implementations-- the
 578         * interrupt_mask register cannot be written, so no timer
 579         * interrupts can be masked within the PLD.
 580         */
 581        str_prop = of_get_property(op->dev.of_node, "model", NULL);
 582        p->broken = (str_prop && !strcmp(str_prop, WD_BADMODEL));
 583
 584        if (!p->enabled)
 585                cpwd_toggleintr(p, -1, WD_INTR_OFF);
 586
 587        for (i = 0; i < WD_NUMDEVS; i++) {
 588                static const char *cpwd_names[] = { "RIC", "XIR", "POR" };
 589                static int *parms[] = { &wd0_timeout,
 590                                        &wd1_timeout,
 591                                        &wd2_timeout };
 592                struct miscdevice *mp = &p->devs[i].misc;
 593
 594                mp->minor = WD0_MINOR + i;
 595                mp->name = cpwd_names[i];
 596                mp->fops = &cpwd_fops;
 597
 598                p->devs[i].regs = p->regs + (i * WD_TIMER_REGSZ);
 599                p->devs[i].intr_mask = (WD0_INTR_MASK << i);
 600                p->devs[i].runstatus &= ~WD_STAT_BSTOP;
 601                p->devs[i].runstatus |= WD_STAT_INIT;
 602                p->devs[i].timeout = p->timeout;
 603                if (*parms[i])
 604                        p->devs[i].timeout = *parms[i];
 605
 606                err = misc_register(&p->devs[i].misc);
 607                if (err) {
 608                        pr_err("Could not register misc device for dev %d\n",
 609                               i);
 610                        goto out_unregister;
 611                }
 612        }
 613
 614        if (p->broken) {
 615                init_timer(&cpwd_timer);
 616                cpwd_timer.function     = cpwd_brokentimer;
 617                cpwd_timer.data         = (unsigned long) p;
 618                cpwd_timer.expires      = WD_BTIMEOUT;
 619
 620                pr_info("PLD defect workaround enabled for model %s\n",
 621                        WD_BADMODEL);
 622        }
 623
 624        dev_set_drvdata(&op->dev, p);
 625        cpwd_device = p;
 626        err = 0;
 627
 628out:
 629        return err;
 630
 631out_unregister:
 632        for (i--; i >= 0; i--)
 633                misc_deregister(&p->devs[i].misc);
 634
 635out_iounmap:
 636        of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
 637
 638out_free:
 639        kfree(p);
 640        goto out;
 641}
 642
 643static int __devexit cpwd_remove(struct platform_device *op)
 644{
 645        struct cpwd *p = dev_get_drvdata(&op->dev);
 646        int i;
 647
 648        for (i = 0; i < WD_NUMDEVS; i++) {
 649                misc_deregister(&p->devs[i].misc);
 650
 651                if (!p->enabled) {
 652                        cpwd_stoptimer(p, i);
 653                        if (p->devs[i].runstatus & WD_STAT_BSTOP)
 654                                cpwd_resetbrokentimer(p, i);
 655                }
 656        }
 657
 658        if (p->broken)
 659                del_timer_sync(&cpwd_timer);
 660
 661        if (p->initialized)
 662                free_irq(p->irq, p);
 663
 664        of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
 665        kfree(p);
 666
 667        cpwd_device = NULL;
 668
 669        return 0;
 670}
 671
 672static const struct of_device_id cpwd_match[] = {
 673        {
 674                .name = "watchdog",
 675        },
 676        {},
 677};
 678MODULE_DEVICE_TABLE(of, cpwd_match);
 679
 680static struct platform_driver cpwd_driver = {
 681        .driver = {
 682                .name = DRIVER_NAME,
 683                .owner = THIS_MODULE,
 684                .of_match_table = cpwd_match,
 685        },
 686        .probe          = cpwd_probe,
 687        .remove         = __devexit_p(cpwd_remove),
 688};
 689
 690module_platform_driver(cpwd_driver);
 691
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