Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 721 insertions, 0 deletions

diff --git a/drivers/input/keyboard/lkkbd.c b/drivers/input/keyboard/lkkbd.c
new file mode 100644
index 000000000..e4a1839ca
--- /dev/null
+++ b/drivers/input/keyboard/lkkbd.c
@@ -0,0 +1,721 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  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
+ */
+
+/*
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.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
+
+static unsigned short 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 {
+	unsigned short 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]]);
+}
+
+/*
+ * 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);
+	struct input_dev *input_dev = lk->dev;
+	unsigned int keycode;
+	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++)
+			input_report_key(input_dev, lk->keycode[i], 0);
+		input_sync(input_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:
+		keycode = lk->keycode[data];
+		if (keycode != KEY_RESERVED) {
+			input_report_key(input_dev, keycode,
+					 !test_bit(keycode, input_dev->key));
+			input_sync(input_dev);
+		} else {
+			printk(KERN_WARNING
+				"%s: Unknown key with scancode 0x%02x on %s.\n",
+				__FILE__, data, lk->name);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void lkkbd_toggle_leds(struct lkkbd *lk)
+{
+	struct serio *serio = lk->serio;
+	unsigned char leds_on = 0;
+	unsigned char leds_off = 0;
+
+	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) {
+		serio_write(serio, LK_CMD_LED_ON);
+		serio_write(serio, leds_on);
+	}
+	if (leds_off != 0) {
+		serio_write(serio, LK_CMD_LED_OFF);
+		serio_write(serio, leds_off);
+	}
+}
+
+static void lkkbd_toggle_keyclick(struct lkkbd *lk, bool on)
+{
+	struct serio *serio = lk->serio;
+
+	if (on) {
+		DBG("%s: Activating key clicks\n", __func__);
+		serio_write(serio, LK_CMD_ENABLE_KEYCLICK);
+		serio_write(serio, volume_to_hw(lk->keyclick_volume));
+		serio_write(serio, LK_CMD_ENABLE_CTRCLICK);
+		serio_write(serio, volume_to_hw(lk->ctrlclick_volume));
+	} else {
+		DBG("%s: Deactivating key clicks\n", __func__);
+		serio_write(serio, LK_CMD_DISABLE_KEYCLICK);
+		serio_write(serio, LK_CMD_DISABLE_CTRCLICK);
+	}
+
+}
+
+/*
+ * 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);
+
+	switch (type) {
+	case EV_LED:
+		lkkbd_toggle_leds(lk);
+		return 0;
+
+	case EV_SND:
+		switch (code) {
+		case SND_CLICK:
+			lkkbd_toggle_keyclick(lk, value);
+			return 0;
+
+		case SND_BELL:
+			if (value != 0)
+				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",
+			__func__, 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;
+
+	/* Ask for ID */
+	serio_write(lk->serio, LK_CMD_REQUEST_ID);
+
+	/* Reset parameters */
+	serio_write(lk->serio, LK_CMD_SET_DEFAULTS);
+
+	/* Set LEDs */
+	lkkbd_toggle_leds(lk);
+
+	/*
+	 * Try to activate extended LK401 mode. This command will
+	 * only work with a LK401 keyboard and grants access to
+	 * LAlt, RAlt, RCompose and RShift.
+	 */
+	serio_write(lk->serio, LK_CMD_ENABLE_LK401);
+
+	/* Set all keys to UPDOWN mode */
+	for (division = 1; division <= 14; division++)
+		serio_write(lk->serio,
+			    LK_CMD_SET_MODE(LK_MODE_UPDOWN, division));
+
+	/* Enable bell and set volume */
+	serio_write(lk->serio, LK_CMD_ENABLE_BELL);
+	serio_write(lk->serio, volume_to_hw(lk->bell_volume));
+
+	/* Enable/disable keyclick (and possibly set volume) */
+	lkkbd_toggle_keyclick(lk, test_bit(SND_CLICK, lk->dev->snd));
+
+	/* Sound the bell if needed */
+	if (test_bit(SND_BELL, lk->dev->snd))
+		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));
+
+	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[0]);
+	input_dev->keycodemax = ARRAY_SIZE(lk->keycode);
+
+	for (i = 0; i < LK_NUM_KEYCODES; i++)
+		__set_bit(lk->keycode[i], input_dev->keybit);
+	__clear_bit(KEY_RESERVED, 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;
+
+	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 const 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,
+};
+
+module_serio_driver(lkkbd_drv);