drivers/input/keyboard/hil_kbd.c

   1 /*
   2  * Generic linux-input device driver for keyboard devices
   3  *
   4  * Copyright (c) 2001 Brian S. Julin
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * Alternatively, this software may be distributed under the terms of the
  17  * GNU General Public License ("GPL").
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  23  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  *
  29  * References:
  30  * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
  31  *
  32  */
  33
  34 #include <linux/hil.h>
  35 #include <linux/input.h>
  36 #include <linux/serio.h>
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/completion.h>
  41 #include <linux/slab.h>
  42 #include <linux/pci_ids.h>
  43
  44 #define PREFIX "HIL: "
  45
  46 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
  47 MODULE_DESCRIPTION("HIL keyboard/mouse driver");
  48 MODULE_LICENSE("Dual BSD/GPL");
  49 MODULE_ALIAS("serio:ty03pr25id00ex*"); /* HIL keyboard */
  50 MODULE_ALIAS("serio:ty03pr25id0Fex*"); /* HIL mouse */
  51
  52 #define HIL_PACKET_MAX_LENGTH 16
  53
  54 #define HIL_KBD_SET1_UPBIT 0x01
  55 #define HIL_KBD_SET1_SHIFT 1
  56 static unsigned int hil_kbd_set1[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
  57         { HIL_KEYCODES_SET1 };
  58
  59 #define HIL_KBD_SET2_UPBIT 0x01
  60 #define HIL_KBD_SET2_SHIFT 1
  61 /* Set2 is user defined */
  62
  63 #define HIL_KBD_SET3_UPBIT 0x80
  64 #define HIL_KBD_SET3_SHIFT 0
  65 static unsigned int hil_kbd_set3[HIL_KEYCODES_SET3_TBLSIZE] __read_mostly =
  66         { HIL_KEYCODES_SET3 };
  67
  68 static const char hil_language[][16] = { HIL_LOCALE_MAP };
  69
  70 struct hil_dev {
  71         struct input_dev *dev;
  72         struct serio *serio;
  73
  74         /* Input buffer and index for packets from HIL bus. */
  75         hil_packet data[HIL_PACKET_MAX_LENGTH];
  76         int idx4; /* four counts per packet */
  77
  78         /* Raw device info records from HIL bus, see hil.h for fields. */
  79         char    idd[HIL_PACKET_MAX_LENGTH];     /* DID byte and IDD record */
  80         char    rsc[HIL_PACKET_MAX_LENGTH];     /* RSC record */
  81         char    exd[HIL_PACKET_MAX_LENGTH];     /* EXD record */
  82         char    rnm[HIL_PACKET_MAX_LENGTH + 1]; /* RNM record + NULL term. */
  83
  84         struct completion cmd_done;
  85
  86         bool is_pointer;
  87         /* Extra device details needed for pointing devices. */
  88         unsigned int nbtn, naxes;
  89         unsigned int btnmap[7];
  90 };
  91
  92 static bool hil_dev_is_command_response(hil_packet p)
  93 {
  94         if ((p & ~HIL_CMDCT_POL) == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL))
  95                 return false;
  96
  97         if ((p & ~HIL_CMDCT_RPL) == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL))
  98                 return false;
  99
 100         return true;
 101 }
 102
 103 static void hil_dev_handle_command_response(struct hil_dev *dev)
 104 {
 105         hil_packet p;
 106         char *buf;
 107         int i, idx;
 108
 109         idx = dev->idx4 / 4;
 110         p = dev->data[idx - 1];
 111
 112         switch (p & HIL_PKT_DATA_MASK) {
 113         case HIL_CMD_IDD:
 114                 buf = dev->idd;
 115                 break;
 116
 117         case HIL_CMD_RSC:
 118                 buf = dev->rsc;
 119                 break;
 120
 121         case HIL_CMD_EXD:
 122                 buf = dev->exd;
 123                 break;
 124
 125         case HIL_CMD_RNM:
 126                 dev->rnm[HIL_PACKET_MAX_LENGTH] = 0;
 127                 buf = dev->rnm;
 128                 break;
 129
 130         default:
 131                 /* These occur when device isn't present */
 132                 if (p != (HIL_ERR_INT | HIL_PKT_CMD)) {
 133                         /* Anything else we'd like to know about. */
 134                         printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
 135                 }
 136                 goto out;
 137         }
 138
 139         for (i = 0; i < idx; i++)
 140                 buf[i] = dev->data[i] & HIL_PKT_DATA_MASK;
 141         for (; i < HIL_PACKET_MAX_LENGTH; i++)
 142                 buf[i] = 0;
 143  out:
 144         complete(&dev->cmd_done);
 145 }
 146
 147 static void hil_dev_handle_kbd_events(struct hil_dev *kbd)
 148 {
 149         struct input_dev *dev = kbd->dev;
 150         int idx = kbd->idx4 / 4;
 151         int i;
 152
 153         switch (kbd->data[0] & HIL_POL_CHARTYPE_MASK) {
 154         case HIL_POL_CHARTYPE_NONE:
 155                 return;
 156
 157         case HIL_POL_CHARTYPE_ASCII:
 158                 for (i = 1; i < idx - 1; i++)
 159                         input_report_key(dev, kbd->data[i] & 0x7f, 1);
 160                 break;
 161
 162         case HIL_POL_CHARTYPE_RSVD1:
 163         case HIL_POL_CHARTYPE_RSVD2:
 164         case HIL_POL_CHARTYPE_BINARY:
 165                 for (i = 1; i < idx - 1; i++)
 166                         input_report_key(dev, kbd->data[i], 1);
 167                 break;
 168
 169         case HIL_POL_CHARTYPE_SET1:
 170                 for (i = 1; i < idx - 1; i++) {
 171                         unsigned int key = kbd->data[i];
 172                         int up = key & HIL_KBD_SET1_UPBIT;
 173
 174                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 175                         key = hil_kbd_set1[key >> HIL_KBD_SET1_SHIFT];
 176                         input_report_key(dev, key, !up);
 177                 }
 178                 break;
 179
 180         case HIL_POL_CHARTYPE_SET2:
 181                 for (i = 1; i < idx - 1; i++) {
 182                         unsigned int key = kbd->data[i];
 183                         int up = key & HIL_KBD_SET2_UPBIT;
 184
 185                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 186                         key = key >> HIL_KBD_SET2_SHIFT;
 187                         input_report_key(dev, key, !up);
 188                 }
 189                 break;
 190
 191         case HIL_POL_CHARTYPE_SET3:
 192                 for (i = 1; i < idx - 1; i++) {
 193                         unsigned int key = kbd->data[i];
 194                         int up = key & HIL_KBD_SET3_UPBIT;
 195
 196                         key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 197                         key = hil_kbd_set3[key >> HIL_KBD_SET3_SHIFT];
 198                         input_report_key(dev, key, !up);
 199                 }
 200                 break;
 201         }
 202
 203         input_sync(dev);
 204 }
 205
 206 static void hil_dev_handle_ptr_events(struct hil_dev *ptr)
 207 {
 208         struct input_dev *dev = ptr->dev;
 209         int idx = ptr->idx4 / 4;
 210         hil_packet p = ptr->data[idx - 1];
 211         int i, cnt, laxis;
 212         bool absdev, ax16;
 213
 214         if ((p & HIL_CMDCT_POL) != idx - 1) {
 215                 printk(KERN_WARNING PREFIX
 216                         "Malformed poll packet %x (idx = %i)\n", p, idx);
 217                 return;
 218         }
 219
 220         i = (p & HIL_POL_AXIS_ALT) ? 3 : 0;
 221         laxis = (p & HIL_POL_NUM_AXES_MASK) + i;
 222
 223         ax16 = ptr->idd[1] & HIL_IDD_HEADER_16BIT; /* 8 or 16bit resolution */
 224         absdev = ptr->idd[1] & HIL_IDD_HEADER_ABS;
 225
 226         for (cnt = 1; i < laxis; i++) {
 227                 unsigned int lo, hi, val;
 228
 229                 lo = ptr->data[cnt++] & HIL_PKT_DATA_MASK;
 230                 hi = ax16 ? (ptr->data[cnt++] & HIL_PKT_DATA_MASK) : 0;
 231
 232                 if (absdev) {
 233                         val = lo + (hi << 8);
 234 #ifdef TABLET_AUTOADJUST
 235                         if (val < dev->absmin[ABS_X + i])
 236                                 dev->absmin[ABS_X + i] = val;
 237                         if (val > dev->absmax[ABS_X + i])
 238                                 dev->absmax[ABS_X + i] = val;
 239 #endif
 240                         if (i%3) val = dev->absmax[ABS_X + i] - val;
 241                         input_report_abs(dev, ABS_X + i, val);
 242                 } else {
 243                         val = (int) (((int8_t)lo) | ((int8_t)hi << 8));
 244                         if (i % 3)
 245                                 val *= -1;
 246                         input_report_rel(dev, REL_X + i, val);
 247                 }
 248         }
 249
 250         while (cnt < idx - 1) {
 251                 unsigned int btn = ptr->data[cnt++];
 252                 int up = btn & 1;
 253
 254                 btn &= 0xfe;
 255                 if (btn == 0x8e)
 256                         continue; /* TODO: proximity == touch? */
 257                 if (btn > 0x8c || btn < 0x80)
 258                         continue;
 259                 btn = (btn - 0x80) >> 1;
 260                 btn = ptr->btnmap[btn];
 261                 input_report_key(dev, btn, !up);
 262         }
 263
 264         input_sync(dev);
 265 }
 266
 267 static void hil_dev_process_err(struct hil_dev *dev)
 268 {
 269         printk(KERN_WARNING PREFIX "errored HIL packet\n");
 270         dev->idx4 = 0;
 271         complete(&dev->cmd_done); /* just in case somebody is waiting */
 272 }
 273
 274 static irqreturn_t hil_dev_interrupt(struct serio *serio,
 275                                 unsigned char data, unsigned int flags)
 276 {
 277         struct hil_dev *dev;
 278         hil_packet packet;
 279         int idx;
 280
 281         dev = serio_get_drvdata(serio);
 282         BUG_ON(dev == NULL);
 283
 284         if (dev->idx4 >= HIL_PACKET_MAX_LENGTH * sizeof(hil_packet)) {
 285                 hil_dev_process_err(dev);
 286                 goto out;
 287         }
 288
 289         idx = dev->idx4 / 4;
 290         if (!(dev->idx4 % 4))
 291                 dev->data[idx] = 0;
 292         packet = dev->data[idx];
 293         packet |= ((hil_packet)data) << ((3 - (dev->idx4 % 4)) * 8);
 294         dev->data[idx] = packet;
 295
 296         /* Records of N 4-byte hil_packets must terminate with a command. */
 297         if ((++dev->idx4 % 4) == 0) {
 298                 if ((packet & 0xffff0000) != HIL_ERR_INT) {
 299                         hil_dev_process_err(dev);
 300                 } else if (packet & HIL_PKT_CMD) {
 301                         if (hil_dev_is_command_response(packet))
 302                                 hil_dev_handle_command_response(dev);
 303                         else if (dev->is_pointer)
 304                                 hil_dev_handle_ptr_events(dev);
 305                         else
 306                                 hil_dev_handle_kbd_events(dev);
 307                         dev->idx4 = 0;
 308                 }
 309         }
 310  out:
 311         return IRQ_HANDLED;
 312 }
 313
 314 static void hil_dev_disconnect(struct serio *serio)
 315 {
 316         struct hil_dev *dev = serio_get_drvdata(serio);
 317
 318         BUG_ON(dev == NULL);
 319
 320         serio_close(serio);
 321         input_unregister_device(dev->dev);
 322         serio_set_drvdata(serio, NULL);
 323         kfree(dev);
 324 }
 325
 326 static void hil_dev_keyboard_setup(struct hil_dev *kbd)
 327 {
 328         struct input_dev *input_dev = kbd->dev;
 329         uint8_t did = kbd->idd[0];
 330         int i;
 331
 332         input_dev->evbit[0]     = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 333         input_dev->ledbit[0]    = BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
 334                                   BIT_MASK(LED_SCROLLL);
 335
 336         for (i = 0; i < 128; i++) {
 337                 __set_bit(hil_kbd_set1[i], input_dev->keybit);
 338                 __set_bit(hil_kbd_set3[i], input_dev->keybit);
 339         }
 340         __clear_bit(KEY_RESERVED, input_dev->keybit);
 341
 342         input_dev->keycodemax   = HIL_KEYCODES_SET1_TBLSIZE;
 343         input_dev->keycodesize  = sizeof(hil_kbd_set1[0]);
 344         input_dev->keycode      = hil_kbd_set1;
 345
 346         input_dev->name = strlen(kbd->rnm) ? kbd->rnm : "HIL keyboard";
 347         input_dev->phys = "hpkbd/input0";
 348
 349         printk(KERN_INFO PREFIX "HIL keyboard found (did = 0x%02x, lang = %s)\n",
 350                 did, hil_language[did & HIL_IDD_DID_TYPE_KB_LANG_MASK]);
 351 }
 352
 353 static void hil_dev_pointer_setup(struct hil_dev *ptr)
 354 {
 355         struct input_dev *input_dev = ptr->dev;
 356         uint8_t did = ptr->idd[0];
 357         uint8_t *idd = ptr->idd + 1;
 358         unsigned int naxsets = HIL_IDD_NUM_AXSETS(*idd);
 359         unsigned int i, btntype;
 360         const char *txt;
 361
 362         ptr->naxes = HIL_IDD_NUM_AXES_PER_SET(*idd);
 363
 364         switch (did & HIL_IDD_DID_TYPE_MASK) {
 365         case HIL_IDD_DID_TYPE_REL:
 366                 input_dev->evbit[0] = BIT_MASK(EV_REL);
 367
 368                 for (i = 0; i < ptr->naxes; i++)
 369                         __set_bit(REL_X + i, input_dev->relbit);
 370
 371                 for (i = 3; naxsets > 1 && i < ptr->naxes + 3; i++)
 372                         __set_bit(REL_X + i, input_dev->relbit);
 373
 374                 txt = "relative";
 375                 break;
 376
 377         case HIL_IDD_DID_TYPE_ABS:
 378                 input_dev->evbit[0] = BIT_MASK(EV_ABS);
 379
 380                 for (i = 0; i < ptr->naxes; i++)
 381                         input_set_abs_params(input_dev, ABS_X + i,
 382                                         0, HIL_IDD_AXIS_MAX(idd, i), 0, 0);
 383
 384                 for (i = 3; naxsets > 1 && i < ptr->naxes + 3; i++)
 385                         input_set_abs_params(input_dev, ABS_X + i,
 386                                         0, HIL_IDD_AXIS_MAX(idd, i - 3), 0, 0);
 387
 388 #ifdef TABLET_AUTOADJUST
 389                 for (i = 0; i < ABS_MAX; i++) {
 390                         int diff = input_dev->absmax[ABS_X + i] / 10;
 391                         input_dev->absmin[ABS_X + i] += diff;
 392                         input_dev->absmax[ABS_X + i] -= diff;
 393                 }
 394 #endif
 395
 396                 txt = "absolute";
 397                 break;
 398
 399         default:
 400                 BUG();
 401         }
 402
 403         ptr->nbtn = HIL_IDD_NUM_BUTTONS(idd);
 404         if (ptr->nbtn)
 405                 input_dev->evbit[0] |= BIT_MASK(EV_KEY);
 406
 407         btntype = BTN_MISC;
 408         if ((did & HIL_IDD_DID_ABS_TABLET_MASK) == HIL_IDD_DID_ABS_TABLET)
 409 #ifdef TABLET_SIMULATES_MOUSE
 410                 btntype = BTN_TOUCH;
 411 #else
 412                 btntype = BTN_DIGI;
 413 #endif
 414         if ((did & HIL_IDD_DID_ABS_TSCREEN_MASK) == HIL_IDD_DID_ABS_TSCREEN)
 415                 btntype = BTN_TOUCH;
 416
 417         if ((did & HIL_IDD_DID_REL_MOUSE_MASK) == HIL_IDD_DID_REL_MOUSE)
 418                 btntype = BTN_MOUSE;
 419
 420         for (i = 0; i < ptr->nbtn; i++) {
 421                 __set_bit(btntype | i, input_dev->keybit);
 422                 ptr->btnmap[i] = btntype | i;
 423         }
 424
 425         if (btntype == BTN_MOUSE) {
 426                 /* Swap buttons 2 and 3 */
 427                 ptr->btnmap[1] = BTN_MIDDLE;
 428                 ptr->btnmap[2] = BTN_RIGHT;
 429         }
 430
 431         input_dev->name = strlen(ptr->rnm) ? ptr->rnm : "HIL pointer device";
 432
 433         printk(KERN_INFO PREFIX
 434                 "HIL pointer device found (did: 0x%02x, axis: %s)\n",
 435                 did, txt);
 436         printk(KERN_INFO PREFIX
 437                 "HIL pointer has %i buttons and %i sets of %i axes\n",
 438                 ptr->nbtn, naxsets, ptr->naxes);
 439 }
 440
 441 static int hil_dev_connect(struct serio *serio, struct serio_driver *drv)
 442 {
 443         struct hil_dev *dev;
 444         struct input_dev *input_dev;
 445         uint8_t did, *idd;
 446         int error;
 447
 448         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 449         input_dev = input_allocate_device();
 450         if (!dev || !input_dev) {
 451                 error = -ENOMEM;
 452                 goto bail0;
 453         }
 454
 455         dev->serio = serio;
 456         dev->dev = input_dev;
 457
 458         error = serio_open(serio, drv);
 459         if (error)
 460                 goto bail0;
 461
 462         serio_set_drvdata(serio, dev);
 463
 464         /* Get device info.  MLC driver supplies devid/status/etc. */
 465         init_completion(&dev->cmd_done);
 466         serio_write(serio, 0);
 467         serio_write(serio, 0);
 468         serio_write(serio, HIL_PKT_CMD >> 8);
 469         serio_write(serio, HIL_CMD_IDD);
 470         error = wait_for_completion_killable(&dev->cmd_done);
 471         if (error)
 472                 goto bail1;
 473
 474         init_completion(&dev->cmd_done);
 475         serio_write(serio, 0);
 476         serio_write(serio, 0);
 477         serio_write(serio, HIL_PKT_CMD >> 8);
 478         serio_write(serio, HIL_CMD_RSC);
 479         error = wait_for_completion_killable(&dev->cmd_done);
 480         if (error)
 481                 goto bail1;
 482
 483         init_completion(&dev->cmd_done);
 484         serio_write(serio, 0);
 485         serio_write(serio, 0);
 486         serio_write(serio, HIL_PKT_CMD >> 8);
 487         serio_write(serio, HIL_CMD_RNM);
 488         error = wait_for_completion_killable(&dev->cmd_done);
 489         if (error)
 490                 goto bail1;
 491
 492         init_completion(&dev->cmd_done);
 493         serio_write(serio, 0);
 494         serio_write(serio, 0);
 495         serio_write(serio, HIL_PKT_CMD >> 8);
 496         serio_write(serio, HIL_CMD_EXD);
 497         error = wait_for_completion_killable(&dev->cmd_done);
 498         if (error)
 499                 goto bail1;
 500
 501         did = dev->idd[0];
 502         idd = dev->idd + 1;
 503
 504         switch (did & HIL_IDD_DID_TYPE_MASK) {
 505         case HIL_IDD_DID_TYPE_KB_INTEGRAL:
 506         case HIL_IDD_DID_TYPE_KB_ITF:
 507         case HIL_IDD_DID_TYPE_KB_RSVD:
 508         case HIL_IDD_DID_TYPE_CHAR:
 509                 if (HIL_IDD_NUM_BUTTONS(idd) ||
 510                     HIL_IDD_NUM_AXES_PER_SET(*idd)) {
 511                         printk(KERN_INFO PREFIX
 512                                 "combo devices are not supported.\n");
 513                         goto bail1;
 514                 }
 515
 516                 dev->is_pointer = false;
 517                 hil_dev_keyboard_setup(dev);
 518                 break;
 519
 520         case HIL_IDD_DID_TYPE_REL:
 521         case HIL_IDD_DID_TYPE_ABS:
 522                 dev->is_pointer = true;
 523                 hil_dev_pointer_setup(dev);
 524                 break;
 525
 526         default:
 527                 goto bail1;
 528         }
 529
 530         input_dev->id.bustype   = BUS_HIL;
 531         input_dev->id.vendor    = PCI_VENDOR_ID_HP;
 532         input_dev->id.product   = 0x0001; /* TODO: get from kbd->rsc */
 533         input_dev->id.version   = 0x0100; /* TODO: get from kbd->rsc */
 534         input_dev->dev.parent   = &serio->dev;
 535
 536         if (!dev->is_pointer) {
 537                 serio_write(serio, 0);
 538                 serio_write(serio, 0);
 539                 serio_write(serio, HIL_PKT_CMD >> 8);
 540                 /* Enable Keyswitch Autorepeat 1 */
 541                 serio_write(serio, HIL_CMD_EK1);
 542                 /* No need to wait for completion */
 543         }
 544
 545         error = input_register_device(input_dev);
 546         if (error)
 547                 goto bail1;
 548
 549         return 0;
 550
 551  bail1:
 552         serio_close(serio);
 553         serio_set_drvdata(serio, NULL);
 554  bail0:
 555         input_free_device(input_dev);
 556         kfree(dev);
 557         return error;
 558 }
 559
 560 static struct serio_device_id hil_dev_ids[] = {
 561         {
 562                 .type = SERIO_HIL_MLC,
 563                 .proto = SERIO_HIL,
 564                 .id = SERIO_ANY,
 565                 .extra = SERIO_ANY,
 566         },
 567         { 0 }
 568 };
 569
 570 static struct serio_driver hil_serio_drv = {
 571         .driver         = {
 572                 .name   = "hil_dev",
 573         },
 574         .description    = "HP HIL keyboard/mouse/tablet driver",
 575         .id_table       = hil_dev_ids,
 576         .connect        = hil_dev_connect,
 577         .disconnect     = hil_dev_disconnect,
 578         .interrupt      = hil_dev_interrupt
 579 };
 580
 581 static int __init hil_dev_init(void)
 582 {
 583         return serio_register_driver(&hil_serio_drv);
 584 }
 585
 586 static void __exit hil_dev_exit(void)
 587 {
 588         serio_unregister_driver(&hil_serio_drv);
 589 }
 590
 591 module_init(hil_dev_init);
 592 module_exit(hil_dev_exit);