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lkkbd.c

/*
 *  Copyright (C) 2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
 */

/*
 * LK keyboard driver for Linux, based on sunkbd.c (C) by Vojtech Pavlik
 */

/*
 * DEC LK201 and LK401 keyboard driver for Linux (primary for DECstations
 * and VAXstations, but can also be used on any standard RS232 with an
 * adaptor).
 *
 * DISCLAIMER: This works for _me_. If you break anything by using the
 * information given below, I will _not_ be liable!
 *
 * RJ10 pinout:         To DE9:           Or DB25:
 *    1 - RxD <---->    Pin 3 (TxD) <->   Pin 2 (TxD)
 *    2 - GND <---->    Pin 5 (GND) <->   Pin 7 (GND)
 *    4 - TxD <---->    Pin 2 (RxD) <->   Pin 3 (RxD)
 *    3 - +12V (from HDD drive connector), DON'T connect to DE9 or DB25!!!
 *
 * Pin numbers for DE9 and DB25 are noted on the plug (quite small:). For
 * RJ10, it's like this:
 *
 *      __=__     Hold the plug in front of you, cable downwards,
 *     /___/|     nose is hidden behind the plug. Now, pin 1 is at
 *    |1234||     the left side, pin 4 at the right and 2 and 3 are
 *    |IIII||     in between, of course:)
 *    |    ||
 *    |____|/
 *      ||  So the adaptor consists of three connected cables
 *      ||  for data transmission (RxD and TxD) and signal ground.
 *          Additionally, you have to get +12V from somewhere.
 * Most easily, you'll get that from a floppy or HDD power connector.
 * It's the yellow cable there (black is ground and red is +5V).
 *
 * The keyboard and all the commands it understands are documented in
 * "VCB02 Video Subsystem - Technical Manual", EK-104AA-TM-001. This
 * document is LK201 specific, but LK401 is mostly compatible. It comes
 * up in LK201 mode and doesn't report any of the additional keys it
 * has. These need to be switched on with the LK_CMD_ENABLE_LK401
 * command. You'll find this document (scanned .pdf file) on MANX,
 * a search engine specific to DEC documentation. Try
 * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/workqueue.h>

#define DRIVER_DESC     "LK keyboard driver"

MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE ("GPL");

/*
 * Known parameters:
 *    bell_volume
 *    keyclick_volume
 *    ctrlclick_volume
 *
 * Please notice that there's not yet an API to set these at runtime.
 */
static int bell_volume = 100; /* % */
module_param (bell_volume, int, 0);
MODULE_PARM_DESC (bell_volume, "Bell volume (in %). default is 100%");

static int keyclick_volume = 100; /* % */
module_param (keyclick_volume, int, 0);
MODULE_PARM_DESC (keyclick_volume, "Keyclick volume (in %), default is 100%");

static int ctrlclick_volume = 100; /* % */
module_param (ctrlclick_volume, int, 0);
MODULE_PARM_DESC (ctrlclick_volume, "Ctrlclick volume (in %), default is 100%");

static int lk201_compose_is_alt;
module_param (lk201_compose_is_alt, int, 0);
MODULE_PARM_DESC (lk201_compose_is_alt, "If set non-zero, LK201' Compose key "
            "will act as an Alt key");



#undef LKKBD_DEBUG
#ifdef LKKBD_DEBUG
#define DBG(x...) printk (x)
#else
#define DBG(x...) do {} while (0)
#endif

/* LED control */
#define LK_LED_WAIT           0x81
#define LK_LED_COMPOSE        0x82
#define LK_LED_SHIFTLOCK      0x84
#define LK_LED_SCROLLLOCK     0x88
#define LK_CMD_LED_ON         0x13
#define LK_CMD_LED_OFF        0x11

/* Mode control */
#define LK_MODE_DOWN          0x80
#define LK_MODE_AUTODOWN      0x82
#define LK_MODE_UPDOWN        0x86
#define LK_CMD_SET_MODE(mode,div)   ((mode) | ((div) << 3))

/* Misc commands */
#define LK_CMD_ENABLE_KEYCLICK      0x1b
#define LK_CMD_DISABLE_KEYCLICK     0x99
#define LK_CMD_DISABLE_BELL   0xa1
#define LK_CMD_SOUND_BELL     0xa7
#define LK_CMD_ENABLE_BELL    0x23
#define LK_CMD_DISABLE_CTRCLICK     0xb9
#define LK_CMD_ENABLE_CTRCLICK      0xbb
#define LK_CMD_SET_DEFAULTS   0xd3
#define LK_CMD_POWERCYCLE_RESET     0xfd
#define LK_CMD_ENABLE_LK401   0xe9
#define LK_CMD_REQUEST_ID     0xab

/* Misc responses from keyboard */
#define LK_STUCK_KEY          0x3d
#define LK_SELFTEST_FAILED    0x3e
#define LK_ALL_KEYS_UP        0xb3
#define LK_METRONOME          0xb4
#define LK_OUTPUT_ERROR       0xb5
#define LK_INPUT_ERROR        0xb6
#define LK_KBD_LOCKED         0xb7
#define LK_KBD_TEST_MODE_ACK  0xb8
#define LK_PREFIX_KEY_DOWN    0xb9
#define LK_MODE_CHANGE_ACK    0xba
#define LK_RESPONSE_RESERVED  0xbb

#define LK_NUM_KEYCODES       256
#define LK_NUM_IGNORE_BYTES   6
typedef u_int16_t lk_keycode_t;



static lk_keycode_t lkkbd_keycode[LK_NUM_KEYCODES] = {
      [0x56] = KEY_F1,
      [0x57] = KEY_F2,
      [0x58] = KEY_F3,
      [0x59] = KEY_F4,
      [0x5a] = KEY_F5,
      [0x64] = KEY_F6,
      [0x65] = KEY_F7,
      [0x66] = KEY_F8,
      [0x67] = KEY_F9,
      [0x68] = KEY_F10,
      [0x71] = KEY_F11,
      [0x72] = KEY_F12,
      [0x73] = KEY_F13,
      [0x74] = KEY_F14,
      [0x7c] = KEY_F15,
      [0x7d] = KEY_F16,
      [0x80] = KEY_F17,
      [0x81] = KEY_F18,
      [0x82] = KEY_F19,
      [0x83] = KEY_F20,
      [0x8a] = KEY_FIND,
      [0x8b] = KEY_INSERT,
      [0x8c] = KEY_DELETE,
      [0x8d] = KEY_SELECT,
      [0x8e] = KEY_PAGEUP,
      [0x8f] = KEY_PAGEDOWN,
      [0x92] = KEY_KP0,
      [0x94] = KEY_KPDOT,
      [0x95] = KEY_KPENTER,
      [0x96] = KEY_KP1,
      [0x97] = KEY_KP2,
      [0x98] = KEY_KP3,
      [0x99] = KEY_KP4,
      [0x9a] = KEY_KP5,
      [0x9b] = KEY_KP6,
      [0x9c] = KEY_KPCOMMA,
      [0x9d] = KEY_KP7,
      [0x9e] = KEY_KP8,
      [0x9f] = KEY_KP9,
      [0xa0] = KEY_KPMINUS,
      [0xa1] = KEY_PROG1,
      [0xa2] = KEY_PROG2,
      [0xa3] = KEY_PROG3,
      [0xa4] = KEY_PROG4,
      [0xa7] = KEY_LEFT,
      [0xa8] = KEY_RIGHT,
      [0xa9] = KEY_DOWN,
      [0xaa] = KEY_UP,
      [0xab] = KEY_RIGHTSHIFT,
      [0xac] = KEY_LEFTALT,
      [0xad] = KEY_COMPOSE, /* Right Compose, that is. */
      [0xae] = KEY_LEFTSHIFT, /* Same as KEY_RIGHTSHIFT on LK201 */
      [0xaf] = KEY_LEFTCTRL,
      [0xb0] = KEY_CAPSLOCK,
      [0xb1] = KEY_COMPOSE, /* Left Compose, that is. */
      [0xb2] = KEY_RIGHTALT,
      [0xbc] = KEY_BACKSPACE,
      [0xbd] = KEY_ENTER,
      [0xbe] = KEY_TAB,
      [0xbf] = KEY_ESC,
      [0xc0] = KEY_1,
      [0xc1] = KEY_Q,
      [0xc2] = KEY_A,
      [0xc3] = KEY_Z,
      [0xc5] = KEY_2,
      [0xc6] = KEY_W,
      [0xc7] = KEY_S,
      [0xc8] = KEY_X,
      [0xc9] = KEY_102ND,
      [0xcb] = KEY_3,
      [0xcc] = KEY_E,
      [0xcd] = KEY_D,
      [0xce] = KEY_C,
      [0xd0] = KEY_4,
      [0xd1] = KEY_R,
      [0xd2] = KEY_F,
      [0xd3] = KEY_V,
      [0xd4] = KEY_SPACE,
      [0xd6] = KEY_5,
      [0xd7] = KEY_T,
      [0xd8] = KEY_G,
      [0xd9] = KEY_B,
      [0xdb] = KEY_6,
      [0xdc] = KEY_Y,
      [0xdd] = KEY_H,
      [0xde] = KEY_N,
      [0xe0] = KEY_7,
      [0xe1] = KEY_U,
      [0xe2] = KEY_J,
      [0xe3] = KEY_M,
      [0xe5] = KEY_8,
      [0xe6] = KEY_I,
      [0xe7] = KEY_K,
      [0xe8] = KEY_COMMA,
      [0xea] = KEY_9,
      [0xeb] = KEY_O,
      [0xec] = KEY_L,
      [0xed] = KEY_DOT,
      [0xef] = KEY_0,
      [0xf0] = KEY_P,
      [0xf2] = KEY_SEMICOLON,
      [0xf3] = KEY_SLASH,
      [0xf5] = KEY_EQUAL,
      [0xf6] = KEY_RIGHTBRACE,
      [0xf7] = KEY_BACKSLASH,
      [0xf9] = KEY_MINUS,
      [0xfa] = KEY_LEFTBRACE,
      [0xfb] = KEY_APOSTROPHE,
};

#define CHECK_LED(LK, VAR_ON, VAR_OFF, LED, BITS) do {            \
      if (test_bit (LED, (LK)->dev->led))             \
            VAR_ON |= BITS;                           \
      else                                      \
            VAR_OFF |= BITS;                    \
      } while (0)

/*
 * Per-keyboard data
 */
struct lkkbd {
      lk_keycode_t keycode[LK_NUM_KEYCODES];
      int ignore_bytes;
      unsigned char id[LK_NUM_IGNORE_BYTES];
      struct input_dev *dev;
      struct serio *serio;
      struct work_struct tq;
      char name[64];
      char phys[32];
      char type;
      int bell_volume;
      int keyclick_volume;
      int ctrlclick_volume;
};

#ifdef LKKBD_DEBUG
/*
 * Responses from the keyboard and mapping back to their names.
 */
static struct {
      unsigned char value;
      unsigned char *name;
} lk_response[] = {
#define RESPONSE(x) { .value = (x), .name = #x, }
      RESPONSE (LK_STUCK_KEY),
      RESPONSE (LK_SELFTEST_FAILED),
      RESPONSE (LK_ALL_KEYS_UP),
      RESPONSE (LK_METRONOME),
      RESPONSE (LK_OUTPUT_ERROR),
      RESPONSE (LK_INPUT_ERROR),
      RESPONSE (LK_KBD_LOCKED),
      RESPONSE (LK_KBD_TEST_MODE_ACK),
      RESPONSE (LK_PREFIX_KEY_DOWN),
      RESPONSE (LK_MODE_CHANGE_ACK),
      RESPONSE (LK_RESPONSE_RESERVED),
#undef RESPONSE
};

static unsigned char *
response_name (unsigned char value)
{
      int i;

      for (i = 0; i < ARRAY_SIZE (lk_response); i++)
            if (lk_response[i].value == value)
                  return lk_response[i].name;

      return "<unknown>";
}
#endif /* LKKBD_DEBUG */

/*
 * Calculate volume parameter byte for a given volume.
 */
static unsigned char
volume_to_hw (int volume_percent)
{
      unsigned char ret = 0;

      if (volume_percent < 0)
            volume_percent = 0;
      if (volume_percent > 100)
            volume_percent = 100;

      if (volume_percent >= 0)
            ret = 7;
      if (volume_percent >= 13)     /* 12.5 */
            ret = 6;
      if (volume_percent >= 25)
            ret = 5;
      if (volume_percent >= 38)     /* 37.5 */
            ret = 4;
      if (volume_percent >= 50)
            ret = 3;
      if (volume_percent >= 63)     /* 62.5 */
            ret = 2;          /* This is the default volume */
      if (volume_percent >= 75)
            ret = 1;
      if (volume_percent >= 88)     /* 87.5 */
            ret = 0;

      ret |= 0x80;

      return ret;
}

static void
lkkbd_detection_done (struct lkkbd *lk)
{
      int i;

      /*
       * Reset setting for Compose key. Let Compose be KEY_COMPOSE.
       */
      lk->keycode[0xb1] = KEY_COMPOSE;

      /*
       * Print keyboard name and modify Compose=Alt on user's request.
       */
      switch (lk->id[4]) {
            case 1:
                  strlcpy (lk->name, "DEC LK201 keyboard",
                         sizeof (lk->name));

                  if (lk201_compose_is_alt)
                        lk->keycode[0xb1] = KEY_LEFTALT;
                  break;

            case 2:
                  strlcpy (lk->name, "DEC LK401 keyboard",
                         sizeof (lk->name));
                  break;

            default:
                  strlcpy (lk->name, "Unknown DEC keyboard",
                         sizeof (lk->name));
                  printk (KERN_ERR "lkkbd: keyboard on %s is unknown, "
                              "please report to Jan-Benedict Glaw "
                              "<jbglaw@lug-owl.de>\n", lk->phys);
                  printk (KERN_ERR "lkkbd: keyboard ID'ed as:");
                  for (i = 0; i < LK_NUM_IGNORE_BYTES; i++)
                        printk (" 0x%02x", lk->id[i]);
                  printk ("\n");
                  break;
      }
      printk (KERN_INFO "lkkbd: keyboard on %s identified as: %s\n",
                  lk->phys, lk->name);

      /*
       * Report errors during keyboard boot-up.
       */
      switch (lk->id[2]) {
            case 0x00:
                  /* All okay */
                  break;

            case LK_STUCK_KEY:
                  printk (KERN_ERR "lkkbd: Stuck key on keyboard at "
                              "%s\n", lk->phys);
                  break;

            case LK_SELFTEST_FAILED:
                  printk (KERN_ERR "lkkbd: Selftest failed on keyboard "
                              "at %s, keyboard may not work "
                              "properly\n", lk->phys);
                  break;

            default:
                  printk (KERN_ERR "lkkbd: Unknown error %02x on "
                              "keyboard at %s\n", lk->id[2],
                              lk->phys);
                  break;
      }

      /*
       * Try to hint user if there's a stuck key.
       */
      if (lk->id[2] == LK_STUCK_KEY && lk->id[3] != 0)
            printk (KERN_ERR "Scancode of stuck key is 0x%02x, keycode "
                        "is 0x%04x\n", lk->id[3],
                        lk->keycode[lk->id[3]]);

      return;
}

/*
 * lkkbd_interrupt() is called by the low level driver when a character
 * is received.
 */
static irqreturn_t
lkkbd_interrupt (struct serio *serio, unsigned char data, unsigned int flags)
{
      struct lkkbd *lk = serio_get_drvdata (serio);
      int i;

      DBG (KERN_INFO "Got byte 0x%02x\n", data);

      if (lk->ignore_bytes > 0) {
            DBG (KERN_INFO "Ignoring a byte on %s\n", lk->name);
            lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;

            if (lk->ignore_bytes == 0)
                  lkkbd_detection_done (lk);

            return IRQ_HANDLED;
      }

      switch (data) {
            case LK_ALL_KEYS_UP:
                  for (i = 0; i < ARRAY_SIZE (lkkbd_keycode); i++)
                        if (lk->keycode[i] != KEY_RESERVED)
                              input_report_key (lk->dev, lk->keycode[i], 0);
                  input_sync (lk->dev);
                  break;

            case 0x01:
                  DBG (KERN_INFO "Got 0x01, scheduling re-initialization\n");
                  lk->ignore_bytes = LK_NUM_IGNORE_BYTES;
                  lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data;
                  schedule_work (&lk->tq);
                  break;

            case LK_METRONOME:
            case LK_OUTPUT_ERROR:
            case LK_INPUT_ERROR:
            case LK_KBD_LOCKED:
            case LK_KBD_TEST_MODE_ACK:
            case LK_PREFIX_KEY_DOWN:
            case LK_MODE_CHANGE_ACK:
            case LK_RESPONSE_RESERVED:
                  DBG (KERN_INFO "Got %s and don't know how to handle...\n",
                              response_name (data));
                  break;

            default:
                  if (lk->keycode[data] != KEY_RESERVED) {
                        if (!test_bit (lk->keycode[data], lk->dev->key))
                              input_report_key (lk->dev, lk->keycode[data], 1);
                        else
                              input_report_key (lk->dev, lk->keycode[data], 0);
                        input_sync (lk->dev);
                        } else
                                printk (KERN_WARNING "%s: Unknown key with "
                                    "scancode 0x%02x on %s.\n",
                                    __FILE__, data, lk->name);
      }

      return IRQ_HANDLED;
}

/*
 * lkkbd_event() handles events from the input module.
 */
static int
lkkbd_event (struct input_dev *dev, unsigned int type, unsigned int code,
            int value)
{
      struct lkkbd *lk = input_get_drvdata (dev);
      unsigned char leds_on = 0;
      unsigned char leds_off = 0;

      switch (type) {
            case EV_LED:
                  CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
                  CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
                  CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
                  CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
                  if (leds_on != 0) {
                        lk->serio->write (lk->serio, LK_CMD_LED_ON);
                        lk->serio->write (lk->serio, leds_on);
                  }
                  if (leds_off != 0) {
                        lk->serio->write (lk->serio, LK_CMD_LED_OFF);
                        lk->serio->write (lk->serio, leds_off);
                  }
                  return 0;

            case EV_SND:
                  switch (code) {
                        case SND_CLICK:
                              if (value == 0) {
                                    DBG ("%s: Deactivating key clicks\n", __FUNCTION__);
                                    lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
                                    lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
                              } else {
                                    DBG ("%s: Activating key clicks\n", __FUNCTION__);
                                    lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
                                    lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
                                    lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
                                    lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
                              }
                              return 0;

                        case SND_BELL:
                              if (value != 0)
                                    lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);

                              return 0;
                  }
                  break;

            default:
                  printk (KERN_ERR "%s (): Got unknown type %d, code %d, value %d\n",
                              __FUNCTION__, type, code, value);
      }

      return -1;
}

/*
 * lkkbd_reinit() sets leds and beeps to a state the computer remembers they
 * were in.
 */
static void
lkkbd_reinit (struct work_struct *work)
{
      struct lkkbd *lk = container_of(work, struct lkkbd, tq);
      int division;
      unsigned char leds_on = 0;
      unsigned char leds_off = 0;

      /* Ask for ID */
      lk->serio->write (lk->serio, LK_CMD_REQUEST_ID);

      /* Reset parameters */
      lk->serio->write (lk->serio, LK_CMD_SET_DEFAULTS);

      /* Set LEDs */
      CHECK_LED (lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK);
      CHECK_LED (lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE);
      CHECK_LED (lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK);
      CHECK_LED (lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT);
      if (leds_on != 0) {
            lk->serio->write (lk->serio, LK_CMD_LED_ON);
            lk->serio->write (lk->serio, leds_on);
      }
      if (leds_off != 0) {
            lk->serio->write (lk->serio, LK_CMD_LED_OFF);
            lk->serio->write (lk->serio, leds_off);
      }

      /*
       * Try to activate extended LK401 mode. This command will
       * only work with a LK401 keyboard and grants access to
       * LAlt, RAlt, RCompose and RShift.
       */
      lk->serio->write (lk->serio, LK_CMD_ENABLE_LK401);

      /* Set all keys to UPDOWN mode */
      for (division = 1; division <= 14; division++)
            lk->serio->write (lk->serio, LK_CMD_SET_MODE (LK_MODE_UPDOWN,
                              division));

      /* Enable bell and set volume */
      lk->serio->write (lk->serio, LK_CMD_ENABLE_BELL);
      lk->serio->write (lk->serio, volume_to_hw (lk->bell_volume));

      /* Enable/disable keyclick (and possibly set volume) */
      if (test_bit (SND_CLICK, lk->dev->snd)) {
            lk->serio->write (lk->serio, LK_CMD_ENABLE_KEYCLICK);
            lk->serio->write (lk->serio, volume_to_hw (lk->keyclick_volume));
            lk->serio->write (lk->serio, LK_CMD_ENABLE_CTRCLICK);
            lk->serio->write (lk->serio, volume_to_hw (lk->ctrlclick_volume));
      } else {
            lk->serio->write (lk->serio, LK_CMD_DISABLE_KEYCLICK);
            lk->serio->write (lk->serio, LK_CMD_DISABLE_CTRCLICK);
      }

      /* Sound the bell if needed */
      if (test_bit (SND_BELL, lk->dev->snd))
            lk->serio->write (lk->serio, LK_CMD_SOUND_BELL);
}

/*
 * lkkbd_connect() probes for a LK keyboard and fills the necessary structures.
 */
static int
lkkbd_connect (struct serio *serio, struct serio_driver *drv)
{
      struct lkkbd *lk;
      struct input_dev *input_dev;
      int i;
      int err;

      lk = kzalloc (sizeof (struct lkkbd), GFP_KERNEL);
      input_dev = input_allocate_device ();
      if (!lk || !input_dev) {
            err = -ENOMEM;
            goto fail1;
      }

      lk->serio = serio;
      lk->dev = input_dev;
      INIT_WORK (&lk->tq, lkkbd_reinit);
      lk->bell_volume = bell_volume;
      lk->keyclick_volume = keyclick_volume;
      lk->ctrlclick_volume = ctrlclick_volume;
      memcpy (lk->keycode, lkkbd_keycode, sizeof (lk_keycode_t) * LK_NUM_KEYCODES);

      strlcpy (lk->name, "DEC LK keyboard", sizeof(lk->name));
      snprintf (lk->phys, sizeof(lk->phys), "%s/input0", serio->phys);

      input_dev->name = lk->name;
      input_dev->phys = lk->phys;
      input_dev->id.bustype = BUS_RS232;
      input_dev->id.vendor = SERIO_LKKBD;
      input_dev->id.product = 0;
      input_dev->id.version = 0x0100;
      input_dev->dev.parent = &serio->dev;
      input_dev->event = lkkbd_event;

      input_set_drvdata (input_dev, lk);

      set_bit (EV_KEY, input_dev->evbit);
      set_bit (EV_LED, input_dev->evbit);
      set_bit (EV_SND, input_dev->evbit);
      set_bit (EV_REP, input_dev->evbit);
      set_bit (LED_CAPSL, input_dev->ledbit);
      set_bit (LED_SLEEP, input_dev->ledbit);
      set_bit (LED_COMPOSE, input_dev->ledbit);
      set_bit (LED_SCROLLL, input_dev->ledbit);
      set_bit (SND_BELL, input_dev->sndbit);
      set_bit (SND_CLICK, input_dev->sndbit);

      input_dev->keycode = lk->keycode;
      input_dev->keycodesize = sizeof (lk_keycode_t);
      input_dev->keycodemax = LK_NUM_KEYCODES;
      for (i = 0; i < LK_NUM_KEYCODES; i++)
            set_bit (lk->keycode[i], input_dev->keybit);

      serio_set_drvdata (serio, lk);

      err = serio_open (serio, drv);
      if (err)
            goto fail2;

      err = input_register_device (lk->dev);
      if (err)
            goto fail3;

      lk->serio->write (lk->serio, LK_CMD_POWERCYCLE_RESET);

      return 0;

 fail3:     serio_close (serio);
 fail2:     serio_set_drvdata (serio, NULL);
 fail1:     input_free_device (input_dev);
      kfree (lk);
      return err;
}

/*
 * lkkbd_disconnect() unregisters and closes behind us.
 */
static void
lkkbd_disconnect (struct serio *serio)
{
      struct lkkbd *lk = serio_get_drvdata (serio);

      input_get_device (lk->dev);
      input_unregister_device (lk->dev);
      serio_close (serio);
      serio_set_drvdata (serio, NULL);
      input_put_device (lk->dev);
      kfree (lk);
}

static struct serio_device_id lkkbd_serio_ids[] = {
      {
            .type = SERIO_RS232,
            .proto      = SERIO_LKKBD,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      { 0 }
};

MODULE_DEVICE_TABLE(serio, lkkbd_serio_ids);

static struct serio_driver lkkbd_drv = {
      .driver           = {
            .name = "lkkbd",
      },
      .description      = DRIVER_DESC,
      .id_table   = lkkbd_serio_ids,
      .connect    = lkkbd_connect,
      .disconnect = lkkbd_disconnect,
      .interrupt  = lkkbd_interrupt,
};

/*
 * The functions for insering/removing us as a module.
 */
static int __init
lkkbd_init (void)
{
      return serio_register_driver(&lkkbd_drv);
}

static void __exit
lkkbd_exit (void)
{
      serio_unregister_driver(&lkkbd_drv);
}

module_init (lkkbd_init);
module_exit (lkkbd_exit);


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