drivers/input/keyboard/hil_kbd.c - kernel/windcharger - Git at Google

 /*
  * Generic linux-input device driver for keyboard devices
  *
  * Copyright (c) 2001 Brian S. Julin
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL").
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  *
  * References:
  * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
  *
  */

 #include <linux/hil.h>
 #include <linux/input.h>
 #include <linux/serio.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/semaphore.h>
 #include <linux/slab.h>
 #include <linux/pci_ids.h>

 #define PREFIX "HIL KEYB: "
 #define HIL_GENERIC_NAME "HIL keyboard"

 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
 MODULE_DESCRIPTION(HIL_GENERIC_NAME " driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_ALIAS("serio:ty03pr25id00ex*");

 #define HIL_KBD_MAX_LENGTH 16

 #define HIL_KBD_SET1_UPBIT 0x01
 #define HIL_KBD_SET1_SHIFT 1
 static unsigned int hil_kbd_set1[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
 	{ HIL_KEYCODES_SET1 };

 #define HIL_KBD_SET2_UPBIT 0x01
 #define HIL_KBD_SET2_SHIFT 1
 /* Set2 is user defined */

 #define HIL_KBD_SET3_UPBIT 0x80
 #define HIL_KBD_SET3_SHIFT 0
 static unsigned int hil_kbd_set3[HIL_KEYCODES_SET3_TBLSIZE] __read_mostly =
 	{ HIL_KEYCODES_SET3 };

 static const char hil_language[][16] = { HIL_LOCALE_MAP };

 struct hil_kbd {
 	struct input_dev *dev;
 	struct serio *serio;

 	/* Input buffer and index for packets from HIL bus. */
 	hil_packet data[HIL_KBD_MAX_LENGTH];
 	int idx4; /* four counts per packet */

 	/* Raw device info records from HIL bus, see hil.h for fields. */
 	char	idd[HIL_KBD_MAX_LENGTH];	/* DID byte and IDD record */
 	char	rsc[HIL_KBD_MAX_LENGTH];	/* RSC record */
 	char	exd[HIL_KBD_MAX_LENGTH];	/* EXD record */
 	char	rnm[HIL_KBD_MAX_LENGTH + 1];	/* RNM record + NULL term. */

 	/* Something to sleep around with. */
 	struct semaphore sem;
 };

 /* Process a complete packet after transfer from the HIL */
 static void hil_kbd_process_record(struct hil_kbd *kbd)
 {
 	struct input_dev *dev = kbd->dev;
 	hil_packet *data = kbd->data;
 	hil_packet p;
 	int idx, i, cnt;

 	idx = kbd->idx4/4;
 	p = data[idx - 1];

 	if ((p & ~HIL_CMDCT_POL) ==
 	    (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL))
 		goto report;
 	if ((p & ~HIL_CMDCT_RPL) ==
 	    (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL))
 		goto report;

 	/* Not a poll response.  See if we are loading config records. */
 	switch (p & HIL_PKT_DATA_MASK) {
 	case HIL_CMD_IDD:
 		for (i = 0; i < idx; i++)
 			kbd->idd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 		for (; i < HIL_KBD_MAX_LENGTH; i++)
 			kbd->idd[i] = 0;
 		break;

 	case HIL_CMD_RSC:
 		for (i = 0; i < idx; i++)
 			kbd->rsc[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 		for (; i < HIL_KBD_MAX_LENGTH; i++)
 			kbd->rsc[i] = 0;
 		break;

 	case HIL_CMD_EXD:
 		for (i = 0; i < idx; i++)
 			kbd->exd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 		for (; i < HIL_KBD_MAX_LENGTH; i++)
 			kbd->exd[i] = 0;
 		break;

 	case HIL_CMD_RNM:
 		for (i = 0; i < idx; i++)
 			kbd->rnm[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
 		for (; i < HIL_KBD_MAX_LENGTH + 1; i++)
 			kbd->rnm[i] = '\0';
 		break;

 	default:
 		/* These occur when device isn't present */
 		if (p == (HIL_ERR_INT | HIL_PKT_CMD))
 			break;
 		/* Anything else we'd like to know about. */
 		printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
 		break;
 	}
 	goto out;

  report:
 	cnt = 1;
 	switch (kbd->data[0] & HIL_POL_CHARTYPE_MASK) {
 	case HIL_POL_CHARTYPE_NONE:
 		break;

 	case HIL_POL_CHARTYPE_ASCII:
 		while (cnt < idx - 1)
 			input_report_key(dev, kbd->data[cnt++] & 0x7f, 1);
 		break;

 	case HIL_POL_CHARTYPE_RSVD1:
 	case HIL_POL_CHARTYPE_RSVD2:
 	case HIL_POL_CHARTYPE_BINARY:
 		while (cnt < idx - 1)
 			input_report_key(dev, kbd->data[cnt++], 1);
 		break;

 	case HIL_POL_CHARTYPE_SET1:
 		while (cnt < idx - 1) {
 			unsigned int key;
 			int up;
 			key = kbd->data[cnt++];
 			up = key & HIL_KBD_SET1_UPBIT;
 			key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 			key = hil_kbd_set1[key >> HIL_KBD_SET1_SHIFT];
 			if (key != KEY_RESERVED)
 				input_report_key(dev, key, !up);
 		}
 		break;

 	case HIL_POL_CHARTYPE_SET2:
 		while (cnt < idx - 1) {
 			unsigned int key;
 			int up;
 			key = kbd->data[cnt++];
 			up = key & HIL_KBD_SET2_UPBIT;
 			key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 			key = key >> HIL_KBD_SET2_SHIFT;
 			if (key != KEY_RESERVED)
 				input_report_key(dev, key, !up);
 		}
 		break;

 	case HIL_POL_CHARTYPE_SET3:
 		while (cnt < idx - 1) {
 			unsigned int key;
 			int up;
 			key = kbd->data[cnt++];
 			up = key & HIL_KBD_SET3_UPBIT;
 			key &= (~HIL_KBD_SET1_UPBIT & 0xff);
 			key = hil_kbd_set3[key >> HIL_KBD_SET3_SHIFT];
 			if (key != KEY_RESERVED)
 				input_report_key(dev, key, !up);
 		}
 		break;
 	}
  out:
 	kbd->idx4 = 0;
 	up(&kbd->sem);
 }

 static void hil_kbd_process_err(struct hil_kbd *kbd)
 {
 	printk(KERN_WARNING PREFIX "errored HIL packet\n");
 	kbd->idx4 = 0;
 	up(&kbd->sem);
 }

 static irqreturn_t hil_kbd_interrupt(struct serio *serio,
 				unsigned char data, unsigned int flags)
 {
 	struct hil_kbd *kbd;
 	hil_packet packet;
 	int idx;

 	kbd = serio_get_drvdata(serio);
 	BUG_ON(kbd == NULL);

 	if (kbd->idx4 >= (HIL_KBD_MAX_LENGTH * sizeof(hil_packet))) {
 		hil_kbd_process_err(kbd);
 		return IRQ_HANDLED;
 	}
 	idx = kbd->idx4/4;
 	if (!(kbd->idx4 % 4))
 		kbd->data[idx] = 0;
 	packet = kbd->data[idx];
 	packet |= ((hil_packet)data) << ((3 - (kbd->idx4 % 4)) * 8);
 	kbd->data[idx] = packet;

 	/* Records of N 4-byte hil_packets must terminate with a command. */
 	if ((++(kbd->idx4)) % 4)
 		return IRQ_HANDLED;
 	if ((packet & 0xffff0000) != HIL_ERR_INT) {
 		hil_kbd_process_err(kbd);
 		return IRQ_HANDLED;
 	}
 	if (packet & HIL_PKT_CMD)
 		hil_kbd_process_record(kbd);
 	return IRQ_HANDLED;
 }

 static void hil_kbd_disconnect(struct serio *serio)
 {
 	struct hil_kbd *kbd;

 	kbd = serio_get_drvdata(serio);
 	BUG_ON(kbd == NULL);

 	serio_close(serio);
 	input_unregister_device(kbd->dev);
 	kfree(kbd);
 }

 static int hil_kbd_connect(struct serio *serio, struct serio_driver *drv)
 {
 	struct hil_kbd	*kbd;
 	uint8_t		did, *idd;
 	int		i;

 	kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
 	if (!kbd)
 		return -ENOMEM;

 	kbd->dev = input_allocate_device();
 	if (!kbd->dev)
 		goto bail0;

 	if (serio_open(serio, drv))
 		goto bail1;

 	serio_set_drvdata(serio, kbd);
 	kbd->serio = serio;

 	init_MUTEX_LOCKED(&kbd->sem);

 	/* Get device info.  MLC driver supplies devid/status/etc. */
 	serio->write(serio, 0);
 	serio->write(serio, 0);
 	serio->write(serio, HIL_PKT_CMD >> 8);
 	serio->write(serio, HIL_CMD_IDD);
 	down(&kbd->sem);

 	serio->write(serio, 0);
 	serio->write(serio, 0);
 	serio->write(serio, HIL_PKT_CMD >> 8);
 	serio->write(serio, HIL_CMD_RSC);
 	down(&kbd->sem);

 	serio->write(serio, 0);
 	serio->write(serio, 0);
 	serio->write(serio, HIL_PKT_CMD >> 8);
 	serio->write(serio, HIL_CMD_RNM);
 	down(&kbd->sem);

 	serio->write(serio, 0);
 	serio->write(serio, 0);
 	serio->write(serio, HIL_PKT_CMD >> 8);
 	serio->write(serio, HIL_CMD_EXD);
 	down(&kbd->sem);

 	up(&kbd->sem);

 	did = kbd->idd[0];
 	idd = kbd->idd + 1;
 	switch (did & HIL_IDD_DID_TYPE_MASK) {
 	case HIL_IDD_DID_TYPE_KB_INTEGRAL:
 	case HIL_IDD_DID_TYPE_KB_ITF:
 	case HIL_IDD_DID_TYPE_KB_RSVD:
 	case HIL_IDD_DID_TYPE_CHAR:
 		printk(KERN_INFO PREFIX "HIL keyboard found (did = 0x%02x, lang = %s)\n",
 			did, hil_language[did & HIL_IDD_DID_TYPE_KB_LANG_MASK]);
 		break;
 	default:
 		goto bail2;
 	}

 	if (HIL_IDD_NUM_BUTTONS(idd) || HIL_IDD_NUM_AXES_PER_SET(*idd)) {
 		printk(KERN_INFO PREFIX "keyboards only, no combo devices supported.\n");
 		goto bail2;
 	}

 	kbd->dev->evbit[0]	= BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 	kbd->dev->ledbit[0]	= BIT_MASK(LED_NUML) | BIT_MASK(LED_CAPSL) |
 		BIT_MASK(LED_SCROLLL);
 	kbd->dev->keycodemax	= HIL_KEYCODES_SET1_TBLSIZE;
 	kbd->dev->keycodesize	= sizeof(hil_kbd_set1[0]);
 	kbd->dev->keycode	= hil_kbd_set1;
 	kbd->dev->name		= strlen(kbd->rnm) ? kbd->rnm : HIL_GENERIC_NAME;
 	kbd->dev->phys		= "hpkbd/input0";	/* XXX */

 	kbd->dev->id.bustype	= BUS_HIL;
 	kbd->dev->id.vendor	= PCI_VENDOR_ID_HP;
 	kbd->dev->id.product	= 0x0001; /* TODO: get from kbd->rsc */
 	kbd->dev->id.version	= 0x0100; /* TODO: get from kbd->rsc */
 	kbd->dev->dev.parent	= &serio->dev;

 	for (i = 0; i < 128; i++) {
 		set_bit(hil_kbd_set1[i], kbd->dev->keybit);
 		set_bit(hil_kbd_set3[i], kbd->dev->keybit);
 	}
 	clear_bit(0, kbd->dev->keybit);

 	input_register_device(kbd->dev);
 	printk(KERN_INFO "input: %s, ID: %d\n",
 		kbd->dev->name, did);

 	serio->write(serio, 0);
 	serio->write(serio, 0);
 	serio->write(serio, HIL_PKT_CMD >> 8);
 	serio->write(serio, HIL_CMD_EK1); /* Enable Keyswitch Autorepeat 1 */
 	down(&kbd->sem);
 	up(&kbd->sem);

 	return 0;
  bail2:
 	serio_close(serio);
 	serio_set_drvdata(serio, NULL);
  bail1:
 	input_free_device(kbd->dev);
  bail0:
 	kfree(kbd);
 	return -EIO;
 }

 static struct serio_device_id hil_kbd_ids[] = {
 	{
 		.type = SERIO_HIL_MLC,
 		.proto = SERIO_HIL,
 		.id = SERIO_ANY,
 		.extra = SERIO_ANY,
 	},
 	{ 0 }
 };

 static struct serio_driver hil_kbd_serio_drv = {
 	.driver		= {
 		.name	= "hil_kbd",
 	},
 	.description	= "HP HIL keyboard driver",
 	.id_table	= hil_kbd_ids,
 	.connect	= hil_kbd_connect,
 	.disconnect	= hil_kbd_disconnect,
 	.interrupt	= hil_kbd_interrupt
 };

 static int __init hil_kbd_init(void)
 {
 	return serio_register_driver(&hil_kbd_serio_drv);
 }

 static void __exit hil_kbd_exit(void)
 {
 	serio_unregister_driver(&hil_kbd_serio_drv);
 }

 module_init(hil_kbd_init);
 module_exit(hil_kbd_exit);
	/*
	* Generic linux-input device driver for keyboard devices
	*
	* Copyright (c) 2001 Brian S. Julin
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL").
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	*
	* References:
	* HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
	*
	*/

	#include <linux/hil.h>
	#include <linux/input.h>
	#include <linux/serio.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/semaphore.h>
	#include <linux/slab.h>
	#include <linux/pci_ids.h>

	#define PREFIX "HIL KEYB: "
	#define HIL_GENERIC_NAME "HIL keyboard"

	MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
	MODULE_DESCRIPTION(HIL_GENERIC_NAME " driver");
	MODULE_LICENSE("Dual BSD/GPL");
	MODULE_ALIAS("serio:ty03pr25id00ex*");

	#define HIL_KBD_MAX_LENGTH 16

	#define HIL_KBD_SET1_UPBIT 0x01
	#define HIL_KBD_SET1_SHIFT 1
	static unsigned int hil_kbd_set1[HIL_KEYCODES_SET1_TBLSIZE] __read_mostly =
	{ HIL_KEYCODES_SET1 };

	#define HIL_KBD_SET2_UPBIT 0x01
	#define HIL_KBD_SET2_SHIFT 1
	/* Set2 is user defined */

	#define HIL_KBD_SET3_UPBIT 0x80
	#define HIL_KBD_SET3_SHIFT 0
	static unsigned int hil_kbd_set3[HIL_KEYCODES_SET3_TBLSIZE] __read_mostly =
	{ HIL_KEYCODES_SET3 };

	static const char hil_language[][16] = { HIL_LOCALE_MAP };

	struct hil_kbd {
	struct input_dev *dev;
	struct serio *serio;

	/* Input buffer and index for packets from HIL bus. */
	hil_packet data[HIL_KBD_MAX_LENGTH];
	int idx4; /* four counts per packet */

	/* Raw device info records from HIL bus, see hil.h for fields. */
	char idd[HIL_KBD_MAX_LENGTH]; /* DID byte and IDD record */
	char rsc[HIL_KBD_MAX_LENGTH]; /* RSC record */
	char exd[HIL_KBD_MAX_LENGTH]; /* EXD record */
	char rnm[HIL_KBD_MAX_LENGTH + 1]; /* RNM record + NULL term. */

	/* Something to sleep around with. */
	struct semaphore sem;
	};

	/* Process a complete packet after transfer from the HIL */
	static void hil_kbd_process_record(struct hil_kbd *kbd)
	{
	struct input_dev *dev = kbd->dev;
	hil_packet *data = kbd->data;
	hil_packet p;
	int idx, i, cnt;

	idx = kbd->idx4/4;
	p = data[idx - 1];

	if ((p & ~HIL_CMDCT_POL) ==
	(HIL_ERR_INT \| HIL_PKT_CMD \| HIL_CMD_POL))
	goto report;
	if ((p & ~HIL_CMDCT_RPL) ==
	(HIL_ERR_INT \| HIL_PKT_CMD \| HIL_CMD_RPL))
	goto report;

	/* Not a poll response. See if we are loading config records. */
	switch (p & HIL_PKT_DATA_MASK) {
	case HIL_CMD_IDD:
	for (i = 0; i < idx; i++)
	kbd->idd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
	for (; i < HIL_KBD_MAX_LENGTH; i++)
	kbd->idd[i] = 0;
	break;

	case HIL_CMD_RSC:
	for (i = 0; i < idx; i++)
	kbd->rsc[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
	for (; i < HIL_KBD_MAX_LENGTH; i++)
	kbd->rsc[i] = 0;
	break;

	case HIL_CMD_EXD:
	for (i = 0; i < idx; i++)
	kbd->exd[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
	for (; i < HIL_KBD_MAX_LENGTH; i++)
	kbd->exd[i] = 0;
	break;

	case HIL_CMD_RNM:
	for (i = 0; i < idx; i++)
	kbd->rnm[i] = kbd->data[i] & HIL_PKT_DATA_MASK;
	for (; i < HIL_KBD_MAX_LENGTH + 1; i++)
	kbd->rnm[i] = '\0';
	break;

	default:
	/* These occur when device isn't present */
	if (p == (HIL_ERR_INT \| HIL_PKT_CMD))
	break;
	/* Anything else we'd like to know about. */
	printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
	break;
	}
	goto out;

	report:
	cnt = 1;
	switch (kbd->data[0] & HIL_POL_CHARTYPE_MASK) {
	case HIL_POL_CHARTYPE_NONE:
	break;

	case HIL_POL_CHARTYPE_ASCII:
	while (cnt < idx - 1)
	input_report_key(dev, kbd->data[cnt++] & 0x7f, 1);
	break;

	case HIL_POL_CHARTYPE_RSVD1:
	case HIL_POL_CHARTYPE_RSVD2:
	case HIL_POL_CHARTYPE_BINARY:
	while (cnt < idx - 1)
	input_report_key(dev, kbd->data[cnt++], 1);
	break;

	case HIL_POL_CHARTYPE_SET1:
	while (cnt < idx - 1) {
	unsigned int key;
	int up;
	key = kbd->data[cnt++];
	up = key & HIL_KBD_SET1_UPBIT;
	key &= (~HIL_KBD_SET1_UPBIT & 0xff);
	key = hil_kbd_set1[key >> HIL_KBD_SET1_SHIFT];
	if (key != KEY_RESERVED)
	input_report_key(dev, key, !up);
	}
	break;

	case HIL_POL_CHARTYPE_SET2:
	while (cnt < idx - 1) {
	unsigned int key;
	int up;
	key = kbd->data[cnt++];
	up = key & HIL_KBD_SET2_UPBIT;
	key &= (~HIL_KBD_SET1_UPBIT & 0xff);
	key = key >> HIL_KBD_SET2_SHIFT;
	if (key != KEY_RESERVED)
	input_report_key(dev, key, !up);
	}
	break;

	case HIL_POL_CHARTYPE_SET3:
	while (cnt < idx - 1) {
	unsigned int key;
	int up;
	key = kbd->data[cnt++];
	up = key & HIL_KBD_SET3_UPBIT;
	key &= (~HIL_KBD_SET1_UPBIT & 0xff);
	key = hil_kbd_set3[key >> HIL_KBD_SET3_SHIFT];
	if (key != KEY_RESERVED)
	input_report_key(dev, key, !up);
	}
	break;
	}
	out:
	kbd->idx4 = 0;
	up(&kbd->sem);
	}

	static void hil_kbd_process_err(struct hil_kbd *kbd)
	{
	printk(KERN_WARNING PREFIX "errored HIL packet\n");
	kbd->idx4 = 0;
	up(&kbd->sem);
	}

	static irqreturn_t hil_kbd_interrupt(struct serio *serio,
	unsigned char data, unsigned int flags)
	{
	struct hil_kbd *kbd;
	hil_packet packet;
	int idx;

	kbd = serio_get_drvdata(serio);
	BUG_ON(kbd == NULL);

	if (kbd->idx4 >= (HIL_KBD_MAX_LENGTH * sizeof(hil_packet))) {
	hil_kbd_process_err(kbd);
	return IRQ_HANDLED;
	}
	idx = kbd->idx4/4;
	if (!(kbd->idx4 % 4))
	kbd->data[idx] = 0;
	packet = kbd->data[idx];
	packet \|= ((hil_packet)data) << ((3 - (kbd->idx4 % 4)) * 8);
	kbd->data[idx] = packet;

	/* Records of N 4-byte hil_packets must terminate with a command. */
	if ((++(kbd->idx4)) % 4)
	return IRQ_HANDLED;
	if ((packet & 0xffff0000) != HIL_ERR_INT) {
	hil_kbd_process_err(kbd);
	return IRQ_HANDLED;
	}
	if (packet & HIL_PKT_CMD)
	hil_kbd_process_record(kbd);
	return IRQ_HANDLED;
	}

	static void hil_kbd_disconnect(struct serio *serio)
	{
	struct hil_kbd *kbd;

	kbd = serio_get_drvdata(serio);
	BUG_ON(kbd == NULL);

	serio_close(serio);
	input_unregister_device(kbd->dev);
	kfree(kbd);
	}

	static int hil_kbd_connect(struct serio serio, struct serio_driver drv)
	{
	struct hil_kbd *kbd;
	uint8_t did, *idd;
	int i;

	kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
	if (!kbd)
	return -ENOMEM;

	kbd->dev = input_allocate_device();
	if (!kbd->dev)
	goto bail0;

	if (serio_open(serio, drv))
	goto bail1;

	serio_set_drvdata(serio, kbd);
	kbd->serio = serio;

	init_MUTEX_LOCKED(&kbd->sem);

	/* Get device info. MLC driver supplies devid/status/etc. */
	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_IDD);
	down(&kbd->sem);

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_RSC);
	down(&kbd->sem);

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_RNM);
	down(&kbd->sem);

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_EXD);
	down(&kbd->sem);

	up(&kbd->sem);

	did = kbd->idd[0];
	idd = kbd->idd + 1;
	switch (did & HIL_IDD_DID_TYPE_MASK) {
	case HIL_IDD_DID_TYPE_KB_INTEGRAL:
	case HIL_IDD_DID_TYPE_KB_ITF:
	case HIL_IDD_DID_TYPE_KB_RSVD:
	case HIL_IDD_DID_TYPE_CHAR:
	printk(KERN_INFO PREFIX "HIL keyboard found (did = 0x%02x, lang = %s)\n",
	did, hil_language[did & HIL_IDD_DID_TYPE_KB_LANG_MASK]);
	break;
	default:
	goto bail2;
	}

	if (HIL_IDD_NUM_BUTTONS(idd) \|\| HIL_IDD_NUM_AXES_PER_SET(*idd)) {
	printk(KERN_INFO PREFIX "keyboards only, no combo devices supported.\n");
	goto bail2;
	}

	kbd->dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REP);
	kbd->dev->ledbit[0] = BIT_MASK(LED_NUML) \| BIT_MASK(LED_CAPSL) \|
	BIT_MASK(LED_SCROLLL);
	kbd->dev->keycodemax = HIL_KEYCODES_SET1_TBLSIZE;
	kbd->dev->keycodesize = sizeof(hil_kbd_set1[0]);
	kbd->dev->keycode = hil_kbd_set1;
	kbd->dev->name = strlen(kbd->rnm) ? kbd->rnm : HIL_GENERIC_NAME;
	kbd->dev->phys = "hpkbd/input0"; /* XXX */

	kbd->dev->id.bustype = BUS_HIL;
	kbd->dev->id.vendor = PCI_VENDOR_ID_HP;
	kbd->dev->id.product = 0x0001; /* TODO: get from kbd->rsc */
	kbd->dev->id.version = 0x0100; /* TODO: get from kbd->rsc */
	kbd->dev->dev.parent = &serio->dev;

	for (i = 0; i < 128; i++) {
	set_bit(hil_kbd_set1[i], kbd->dev->keybit);
	set_bit(hil_kbd_set3[i], kbd->dev->keybit);
	}
	clear_bit(0, kbd->dev->keybit);

	input_register_device(kbd->dev);
	printk(KERN_INFO "input: %s, ID: %d\n",
	kbd->dev->name, did);

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_EK1); /* Enable Keyswitch Autorepeat 1 */
	down(&kbd->sem);
	up(&kbd->sem);

	return 0;
	bail2:
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	bail1:
	input_free_device(kbd->dev);
	bail0:
	kfree(kbd);
	return -EIO;
	}

	static struct serio_device_id hil_kbd_ids[] = {
	{
	.type = SERIO_HIL_MLC,
	.proto = SERIO_HIL,
	.id = SERIO_ANY,
	.extra = SERIO_ANY,
	},
	{ 0 }
	};

	static struct serio_driver hil_kbd_serio_drv = {
	.driver = {
	.name = "hil_kbd",
	},
	.description = "HP HIL keyboard driver",
	.id_table = hil_kbd_ids,
	.connect = hil_kbd_connect,
	.disconnect = hil_kbd_disconnect,
	.interrupt = hil_kbd_interrupt
	};

	static int __init hil_kbd_init(void)
	{
	return serio_register_driver(&hil_kbd_serio_drv);
	}

	static void __exit hil_kbd_exit(void)
	{
	serio_unregister_driver(&hil_kbd_serio_drv);
	}

	module_init(hil_kbd_init);
	module_exit(hil_kbd_exit);