1 files changed, 752 insertions, 0 deletions

diff --git a/drivers/input/keyboard/lkkbd.c b/drivers/input/keyboard/lkkbd.c
new file mode 100644
index 000000000000..2694ff2b5beb
--- /dev/null
+++ b/drivers/input/keyboard/lkkbd.c
@@ -0,0 +1,752 @@
+/*
+ *  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
+ *
+ * Should you need to contact me, the author, you can do so either by
+ * email or by paper mail:
+ * Jan-Benedict Glaw, Lilienstraße 16, 33790 Hörste (near Halle/Westf.),
+ * Germany.
+ */
+
+#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 = 0;
+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(LED, BITS) do {               \
+        if (test_bit (LED, lk->dev.led))        \
+                leds_on |= BITS;                \
+        else                                    \
+                leds_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;
+};
+
+/*
+ * 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:
+                        sprintf (lk->name, "DEC LK201 keyboard");
+
+                        if (lk201_compose_is_alt)
+                                lk->keycode[0xb1] = KEY_LEFTALT;
+                        break;
+
+                case 2:
+                        sprintf (lk->name, "DEC LK401 keyboard");
+                        break;
+
+                default:
+                        sprintf (lk->name, "Unknown DEC keyboard");
+                        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 pt_regs *regs)
+{
+        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:
+                        input_regs (&lk->dev, regs);
+                        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 LK_METRONOME:
+                        DBG (KERN_INFO "Got LK_METRONOME and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_OUTPUT_ERROR:
+                        DBG (KERN_INFO "Got LK_OUTPUT_ERROR and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_INPUT_ERROR:
+                        DBG (KERN_INFO "Got LK_INPUT_ERROR and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_KBD_LOCKED:
+                        DBG (KERN_INFO "Got LK_KBD_LOCKED and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_KBD_TEST_MODE_ACK:
+                        DBG (KERN_INFO "Got LK_KBD_TEST_MODE_ACK and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_PREFIX_KEY_DOWN:
+                        DBG (KERN_INFO "Got LK_PREFIX_KEY_DOWN and don't "
+                                        "know how to handle...\n");
+                        break;
+                case LK_MODE_CHANGE_ACK:
+                        DBG (KERN_INFO "Got LK_MODE_CHANGE_ACK and ignored "
+                                        "it properly...\n");
+                        break;
+                case LK_RESPONSE_RESERVED:
+                        DBG (KERN_INFO "Got LK_RESPONSE_RESERVED and don't "
+                                        "know how to handle...\n");
+                        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;
+
+                default:
+                        if (lk->keycode[data] != KEY_RESERVED) {
+                                input_regs (&lk->dev, regs);
+                                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 = dev->private;
+        unsigned char leds_on = 0;
+        unsigned char leds_off = 0;
+
+        switch (type) {
+                case EV_LED:
+                        CHECK_LED (LED_CAPSL, LK_LED_SHIFTLOCK);
+                        CHECK_LED (LED_COMPOSE, LK_LED_COMPOSE);
+                        CHECK_LED (LED_SCROLLL, LK_LED_SCROLLLOCK);
+                        CHECK_LED (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 (void *data)
+{
+        struct lkkbd *lk = data;
+        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 (LED_CAPSL, LK_LED_SHIFTLOCK);
+        CHECK_LED (LED_COMPOSE, LK_LED_COMPOSE);
+        CHECK_LED (LED_SCROLLL, LK_LED_SCROLLLOCK);
+        CHECK_LED (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;
+        int i;
+        int err;
+
+        if (!(lk = kmalloc (sizeof (struct lkkbd), GFP_KERNEL)))
+                return -ENOMEM;
+
+        memset (lk, 0, sizeof (struct lkkbd));
+
+        init_input_dev (&lk->dev);
+        set_bit (EV_KEY, lk->dev.evbit);
+        set_bit (EV_LED, lk->dev.evbit);
+        set_bit (EV_SND, lk->dev.evbit);
+        set_bit (EV_REP, lk->dev.evbit);
+        set_bit (LED_CAPSL, lk->dev.ledbit);
+        set_bit (LED_SLEEP, lk->dev.ledbit);
+        set_bit (LED_COMPOSE, lk->dev.ledbit);
+        set_bit (LED_SCROLLL, lk->dev.ledbit);
+        set_bit (SND_BELL, lk->dev.sndbit);
+        set_bit (SND_CLICK, lk->dev.sndbit);
+
+        lk->serio = serio;
+
+        INIT_WORK (&lk->tq, lkkbd_reinit, lk);
+
+        lk->bell_volume = bell_volume;
+        lk->keyclick_volume = keyclick_volume;
+        lk->ctrlclick_volume = ctrlclick_volume;
+
+        lk->dev.keycode = lk->keycode;
+        lk->dev.keycodesize = sizeof (lk_keycode_t);
+        lk->dev.keycodemax = LK_NUM_KEYCODES;
+
+        lk->dev.event = lkkbd_event;
+        lk->dev.private = lk;
+
+        serio_set_drvdata (serio, lk);
+
+        err = serio_open (serio, drv);
+        if (err) {
+                serio_set_drvdata (serio, NULL);
+                kfree (lk);
+                return err;
+        }
+
+        sprintf (lk->name, "DEC LK keyboard");
+        sprintf (lk->phys, "%s/input0", serio->phys);
+
+        memcpy (lk->keycode, lkkbd_keycode, sizeof (lk_keycode_t) * LK_NUM_KEYCODES);
+        for (i = 0; i < LK_NUM_KEYCODES; i++)
+                set_bit (lk->keycode[i], lk->dev.keybit);
+
+        lk->dev.name = lk->name;
+        lk->dev.phys = lk->phys;
+        lk->dev.id.bustype = BUS_RS232;
+        lk->dev.id.vendor = SERIO_LKKBD;
+        lk->dev.id.product = 0;
+        lk->dev.id.version = 0x0100;
+        lk->dev.dev = &serio->dev;
+
+        input_register_device (&lk->dev);
+
+        printk (KERN_INFO "input: %s on %s, initiating reset\n", lk->name, serio->phys);
+        lk->serio->write (lk->serio, LK_CMD_POWERCYCLE_RESET);
+
+        return 0;
+}
+
+/*
+ * lkkbd_disconnect() unregisters and closes behind us.
+ */
+static void
+lkkbd_disconnect (struct serio *serio)
+{
+        struct lkkbd *lk = serio_get_drvdata (serio);
+
+        input_unregister_device (&lk->dev);
+        serio_close (serio);
+        serio_set_drvdata (serio, NULL);
+        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)
+{
+        serio_register_driver(&lkkbd_drv);
+        return 0;
+}
+
+static void __exit
+lkkbd_exit (void)
+{
+        serio_unregister_driver(&lkkbd_drv);
+}
+
+module_init (lkkbd_init);
+module_exit (lkkbd_exit);
+