[deliverable/linux.git] / drivers / input / serio / libps2.c

/*
 * PS/2 driver library
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 2004 Dmitry Torokhov
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/i8042.h>
#include <linux/libps2.h>

#define DRIVER_DESC	"PS/2 driver library"

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
MODULE_DESCRIPTION("PS/2 driver library");
MODULE_LICENSE("GPL");

/*
 * ps2_sendbyte() sends a byte to the device and waits for acknowledge.
 * It doesn't handle retransmission, though it could - because if there
 * is a need for retransmissions device has to be replaced anyway.
 *
 * ps2_sendbyte() can only be called from a process context.
 */

int ps2_sendbyte(struct ps2dev *ps2dev, unsigned char byte, int timeout)
{
	serio_pause_rx(ps2dev->serio);
	ps2dev->nak = 1;
	ps2dev->flags |= PS2_FLAG_ACK;
	serio_continue_rx(ps2dev->serio);

	if (serio_write(ps2dev->serio, byte) == 0)
		wait_event_timeout(ps2dev->wait,
				   !(ps2dev->flags & PS2_FLAG_ACK),
				   msecs_to_jiffies(timeout));

	serio_pause_rx(ps2dev->serio);
	ps2dev->flags &= ~PS2_FLAG_ACK;
	serio_continue_rx(ps2dev->serio);

	return -ps2dev->nak;
}
EXPORT_SYMBOL(ps2_sendbyte);

void ps2_begin_command(struct ps2dev *ps2dev)
{
	mutex_lock(&ps2dev->cmd_mutex);

	if (i8042_check_port_owner(ps2dev->serio))
		i8042_lock_chip();
}
EXPORT_SYMBOL(ps2_begin_command);

void ps2_end_command(struct ps2dev *ps2dev)
{
	if (i8042_check_port_owner(ps2dev->serio))
		i8042_unlock_chip();

	mutex_unlock(&ps2dev->cmd_mutex);
}
EXPORT_SYMBOL(ps2_end_command);

/*
 * ps2_drain() waits for device to transmit requested number of bytes
 * and discards them.
 */

void ps2_drain(struct ps2dev *ps2dev, int maxbytes, int timeout)
{
	if (maxbytes > sizeof(ps2dev->cmdbuf)) {
		WARN_ON(1);
		maxbytes = sizeof(ps2dev->cmdbuf);
	}

	ps2_begin_command(ps2dev);

	serio_pause_rx(ps2dev->serio);
	ps2dev->flags = PS2_FLAG_CMD;
	ps2dev->cmdcnt = maxbytes;
	serio_continue_rx(ps2dev->serio);

	wait_event_timeout(ps2dev->wait,
			   !(ps2dev->flags & PS2_FLAG_CMD),
			   msecs_to_jiffies(timeout));

	ps2_end_command(ps2dev);
}
EXPORT_SYMBOL(ps2_drain);

/*
 * ps2_is_keyboard_id() checks received ID byte against the list of
 * known keyboard IDs.
 */

int ps2_is_keyboard_id(char id_byte)
{
	static const char keyboard_ids[] = {
		0xab,	/* Regular keyboards		*/
		0xac,	/* NCD Sun keyboard		*/
		0x2b,	/* Trust keyboard, translated	*/
		0x5d,	/* Trust keyboard		*/
		0x60,	/* NMB SGI keyboard, translated */
		0x47,	/* NMB SGI keyboard		*/
	};

	return memchr(keyboard_ids, id_byte, sizeof(keyboard_ids)) != NULL;
}
EXPORT_SYMBOL(ps2_is_keyboard_id);

/*
 * ps2_adjust_timeout() is called after receiving 1st byte of command
 * response and tries to reduce remaining timeout to speed up command
 * completion.
 */

static int ps2_adjust_timeout(struct ps2dev *ps2dev, int command, int timeout)
{
	switch (command) {
		case PS2_CMD_RESET_BAT:
			/*
			 * Device has sent the first response byte after
			 * reset command, reset is thus done, so we can
			 * shorten the timeout.
			 * The next byte will come soon (keyboard) or not
			 * at all (mouse).
			 */
			if (timeout > msecs_to_jiffies(100))
				timeout = msecs_to_jiffies(100);
			break;

		case PS2_CMD_GETID:
			/*
			 * Microsoft Natural Elite keyboard responds to
			 * the GET ID command as it were a mouse, with
			 * a single byte. Fail the command so atkbd will
			 * use alternative probe to detect it.
			 */
			if (ps2dev->cmdbuf[1] == 0xaa) {
				serio_pause_rx(ps2dev->serio);
				ps2dev->flags = 0;
				serio_continue_rx(ps2dev->serio);
				timeout = 0;
			}

			/*
			 * If device behind the port is not a keyboard there
			 * won't be 2nd byte of ID response.
			 */
			if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
				serio_pause_rx(ps2dev->serio);
				ps2dev->flags = ps2dev->cmdcnt = 0;
				serio_continue_rx(ps2dev->serio);
				timeout = 0;
			}
			break;

		default:
			break;
	}

	return timeout;
}

/*
 * ps2_command() sends a command and its parameters to the mouse,
 * then waits for the response and puts it in the param array.
 *
 * ps2_command() can only be called from a process context
 */

int __ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
{
	int timeout;
	int send = (command >> 12) & 0xf;
	int receive = (command >> 8) & 0xf;
	int rc = -1;
	int i;

	if (receive > sizeof(ps2dev->cmdbuf)) {
		WARN_ON(1);
		return -1;
	}

	if (send && !param) {
		WARN_ON(1);
		return -1;
	}

	serio_pause_rx(ps2dev->serio);
	ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0;
	ps2dev->cmdcnt = receive;
	if (receive && param)
		for (i = 0; i < receive; i++)
			ps2dev->cmdbuf[(receive - 1) - i] = param[i];
	serio_continue_rx(ps2dev->serio);

	/*
	 * Some devices (Synaptics) peform the reset before
	 * ACKing the reset command, and so it can take a long
	 * time before the ACK arrives.
	 */
	if (ps2_sendbyte(ps2dev, command & 0xff,
			 command == PS2_CMD_RESET_BAT ? 1000 : 200)) {
		serio_pause_rx(ps2dev->serio);
		goto out_reset_flags;
	}

	for (i = 0; i < send; i++) {
		if (ps2_sendbyte(ps2dev, param[i], 200)) {
			serio_pause_rx(ps2dev->serio);
			goto out_reset_flags;
		}
	}

	/*
	 * The reset command takes a long time to execute.
	 */
	timeout = msecs_to_jiffies(command == PS2_CMD_RESET_BAT ? 4000 : 500);

	timeout = wait_event_timeout(ps2dev->wait,
				     !(ps2dev->flags & PS2_FLAG_CMD1), timeout);

	if (ps2dev->cmdcnt && !(ps2dev->flags & PS2_FLAG_CMD1)) {

		timeout = ps2_adjust_timeout(ps2dev, command, timeout);
		wait_event_timeout(ps2dev->wait,
				   !(ps2dev->flags & PS2_FLAG_CMD), timeout);
	}

	serio_pause_rx(ps2dev->serio);

	if (param)
		for (i = 0; i < receive; i++)
			param[i] = ps2dev->cmdbuf[(receive - 1) - i];

	if (ps2dev->cmdcnt && (command != PS2_CMD_RESET_BAT || ps2dev->cmdcnt != 1))
		goto out_reset_flags;

	rc = 0;

 out_reset_flags:
	ps2dev->flags = 0;
	serio_continue_rx(ps2dev->serio);

	return rc;
}
EXPORT_SYMBOL(__ps2_command);

int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
{
	int rc;

	ps2_begin_command(ps2dev);
	rc = __ps2_command(ps2dev, param, command);
	ps2_end_command(ps2dev);

	return rc;
}
EXPORT_SYMBOL(ps2_command);

/*
 * ps2_init() initializes ps2dev structure
 */

void ps2_init(struct ps2dev *ps2dev, struct serio *serio)
{
	mutex_init(&ps2dev->cmd_mutex);
	lockdep_set_subclass(&ps2dev->cmd_mutex, serio->depth);
	init_waitqueue_head(&ps2dev->wait);
	ps2dev->serio = serio;
}
EXPORT_SYMBOL(ps2_init);

/*
 * ps2_handle_ack() is supposed to be used in interrupt handler
 * to properly process ACK/NAK of a command from a PS/2 device.
 */

int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
{
	switch (data) {
		case PS2_RET_ACK:
			ps2dev->nak = 0;
			break;

		case PS2_RET_NAK:
			ps2dev->flags |= PS2_FLAG_NAK;
			ps2dev->nak = PS2_RET_NAK;
			break;

		case PS2_RET_ERR:
			if (ps2dev->flags & PS2_FLAG_NAK) {
				ps2dev->flags &= ~PS2_FLAG_NAK;
				ps2dev->nak = PS2_RET_ERR;
				break;
			}

		/*
		 * Workaround for mice which don't ACK the Get ID command.
		 * These are valid mouse IDs that we recognize.
		 */
		case 0x00:
		case 0x03:
		case 0x04:
			if (ps2dev->flags & PS2_FLAG_WAITID) {
				ps2dev->nak = 0;
				break;
			}
			/* Fall through */
		default:
			return 0;
	}


	if (!ps2dev->nak) {
		ps2dev->flags &= ~PS2_FLAG_NAK;
		if (ps2dev->cmdcnt)
			ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1;
	}

	ps2dev->flags &= ~PS2_FLAG_ACK;
	wake_up(&ps2dev->wait);

	if (data != PS2_RET_ACK)
		ps2_handle_response(ps2dev, data);

	return 1;
}
EXPORT_SYMBOL(ps2_handle_ack);

/*
 * ps2_handle_response() is supposed to be used in interrupt handler
 * to properly store device's response to a command and notify process
 * waiting for completion of the command.
 */

int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data)
{
	if (ps2dev->cmdcnt)
		ps2dev->cmdbuf[--ps2dev->cmdcnt] = data;

	if (ps2dev->flags & PS2_FLAG_CMD1) {
		ps2dev->flags &= ~PS2_FLAG_CMD1;
		if (ps2dev->cmdcnt)
			wake_up(&ps2dev->wait);
	}

	if (!ps2dev->cmdcnt) {
		ps2dev->flags &= ~PS2_FLAG_CMD;
		wake_up(&ps2dev->wait);
	}

	return 1;
}
EXPORT_SYMBOL(ps2_handle_response);

void ps2_cmd_aborted(struct ps2dev *ps2dev)
{
	if (ps2dev->flags & PS2_FLAG_ACK)
		ps2dev->nak = 1;

	if (ps2dev->flags & (PS2_FLAG_ACK | PS2_FLAG_CMD))
		wake_up(&ps2dev->wait);

	/* reset all flags except last nack */
	ps2dev->flags &= PS2_FLAG_NAK;
}
EXPORT_SYMBOL(ps2_cmd_aborted);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PS/2 driver library
	3	*
	4	* Copyright (c) 1999-2002 Vojtech Pavlik
	5	* Copyright (c) 2004 Dmitry Torokhov
	6	*/
	7
	8	/*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License version 2 as published by
	11	* the Free Software Foundation.
	12	*/
	13
	14	#include <linux/delay.h>
	15	#include <linux/module.h>
d43c36dc	16	#include <linux/sched.h>
1da177e4 LT	17	#include <linux/interrupt.h>
	18	#include <linux/input.h>
	19	#include <linux/serio.h>
181d683d	20	#include <linux/i8042.h>
1da177e4 LT	21	#include <linux/libps2.h>
	22
	23	#define DRIVER_DESC "PS/2 driver library"
	24
	25	MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
	26	MODULE_DESCRIPTION("PS/2 driver library");
	27	MODULE_LICENSE("GPL");
	28
1da177e4	29	/*
c611763d DT	30	* ps2_sendbyte() sends a byte to the device and waits for acknowledge.
	31	* It doesn't handle retransmission, though it could - because if there
	32	* is a need for retransmissions device has to be replaced anyway.
1da177e4	33	*
c611763d	34	* ps2_sendbyte() can only be called from a process context.
1da177e4 LT	35	*/
	36
	37	int ps2_sendbyte(struct ps2dev *ps2dev, unsigned char byte, int timeout)
	38	{
	39	serio_pause_rx(ps2dev->serio);
	40	ps2dev->nak = 1;
	41	ps2dev->flags \|= PS2_FLAG_ACK;
	42	serio_continue_rx(ps2dev->serio);
	43
	44	if (serio_write(ps2dev->serio, byte) == 0)
	45	wait_event_timeout(ps2dev->wait,
	46	!(ps2dev->flags & PS2_FLAG_ACK),
	47	msecs_to_jiffies(timeout));
	48
	49	serio_pause_rx(ps2dev->serio);
	50	ps2dev->flags &= ~PS2_FLAG_ACK;
	51	serio_continue_rx(ps2dev->serio);
	52
	53	return -ps2dev->nak;
	54	}
5206c0d5	55	EXPORT_SYMBOL(ps2_sendbyte);
1da177e4	56
181d683d DT	57	void ps2_begin_command(struct ps2dev *ps2dev)
	58	{
	59	mutex_lock(&ps2dev->cmd_mutex);
	60
	61	if (i8042_check_port_owner(ps2dev->serio))
	62	i8042_lock_chip();
	63	}
	64	EXPORT_SYMBOL(ps2_begin_command);
	65
	66	void ps2_end_command(struct ps2dev *ps2dev)
	67	{
	68	if (i8042_check_port_owner(ps2dev->serio))
	69	i8042_unlock_chip();
	70
	71	mutex_unlock(&ps2dev->cmd_mutex);
	72	}
	73	EXPORT_SYMBOL(ps2_end_command);
	74
c611763d DT	75	/*
	76	* ps2_drain() waits for device to transmit requested number of bytes
	77	* and discards them.
	78	*/
	79
	80	void ps2_drain(struct ps2dev *ps2dev, int maxbytes, int timeout)
	81	{
	82	if (maxbytes > sizeof(ps2dev->cmdbuf)) {
	83	WARN_ON(1);
	84	maxbytes = sizeof(ps2dev->cmdbuf);
	85	}
	86
181d683d	87	ps2_begin_command(ps2dev);
c611763d DT	88
	89	serio_pause_rx(ps2dev->serio);
	90	ps2dev->flags = PS2_FLAG_CMD;
	91	ps2dev->cmdcnt = maxbytes;
	92	serio_continue_rx(ps2dev->serio);
	93
	94	wait_event_timeout(ps2dev->wait,
	95	!(ps2dev->flags & PS2_FLAG_CMD),
	96	msecs_to_jiffies(timeout));
181d683d DT	97
181d683d DT	98	ps2_end_command(ps2dev);
c611763d	99	}
5206c0d5	100	EXPORT_SYMBOL(ps2_drain);
c611763d	101
905ab9d1 DT	102	/*
	103	* ps2_is_keyboard_id() checks received ID byte against the list of
	104	* known keyboard IDs.
	105	*/
	106
9807879b	107	int ps2_is_keyboard_id(char id_byte)
905ab9d1	108	{
c5a69d57	109	static const char keyboard_ids[] = {
905ab9d1 DT	110	0xab, /* Regular keyboards */
	111	0xac, /* NCD Sun keyboard */
	112	0x2b, /* Trust keyboard, translated */
	113	0x5d, /* Trust keyboard */
	114	0x60, /* NMB SGI keyboard, translated */
	115	0x47, /* NMB SGI keyboard */
	116	};
	117
	118	return memchr(keyboard_ids, id_byte, sizeof(keyboard_ids)) != NULL;
	119	}
5206c0d5	120	EXPORT_SYMBOL(ps2_is_keyboard_id);
905ab9d1 DT	121
	122	/*
	123	* ps2_adjust_timeout() is called after receiving 1st byte of command
	124	* response and tries to reduce remaining timeout to speed up command
	125	* completion.
	126	*/
	127
	128	static int ps2_adjust_timeout(struct ps2dev *ps2dev, int command, int timeout)
	129	{
	130	switch (command) {
	131	case PS2_CMD_RESET_BAT:
	132	/*
	133	* Device has sent the first response byte after
	134	* reset command, reset is thus done, so we can
	135	* shorten the timeout.
	136	* The next byte will come soon (keyboard) or not
	137	* at all (mouse).
	138	*/
	139	if (timeout > msecs_to_jiffies(100))
	140	timeout = msecs_to_jiffies(100);
	141	break;
	142
	143	case PS2_CMD_GETID:
9807879b DT	144	/*
	145	* Microsoft Natural Elite keyboard responds to
	146	* the GET ID command as it were a mouse, with
	147	* a single byte. Fail the command so atkbd will
	148	* use alternative probe to detect it.
	149	*/
	150	if (ps2dev->cmdbuf[1] == 0xaa) {
	151	serio_pause_rx(ps2dev->serio);
	152	ps2dev->flags = 0;
	153	serio_continue_rx(ps2dev->serio);
	154	timeout = 0;
	155	}
	156
905ab9d1 DT	157	/*
	158	* If device behind the port is not a keyboard there
	159	* won't be 2nd byte of ID response.
	160	*/
	161	if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
	162	serio_pause_rx(ps2dev->serio);
	163	ps2dev->flags = ps2dev->cmdcnt = 0;
	164	serio_continue_rx(ps2dev->serio);
	165	timeout = 0;
	166	}
	167	break;
	168
	169	default:
	170	break;
	171	}
	172
	173	return timeout;
	174	}
	175
1da177e4 LT	176	/*
	177	* ps2_command() sends a command and its parameters to the mouse,
	178	* then waits for the response and puts it in the param array.
	179	*
	180	* ps2_command() can only be called from a process context
	181	*/
	182
fc69f4a6	183	int __ps2_command(struct ps2dev ps2dev, unsigned char param, int command)
1da177e4 LT	184	{
	185	int timeout;
	186	int send = (command >> 12) & 0xf;
	187	int receive = (command >> 8) & 0xf;
	188	int rc = -1;
	189	int i;
	190
c611763d DT	191	if (receive > sizeof(ps2dev->cmdbuf)) {
	192	WARN_ON(1);
	193	return -1;
	194	}
	195
95349fe8 DT	196	if (send && !param) {
	197	WARN_ON(1);
	198	return -1;
	199	}
	200
1da177e4 LT	201	serio_pause_rx(ps2dev->serio);
	202	ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0;
	203	ps2dev->cmdcnt = receive;
	204	if (receive && param)
	205	for (i = 0; i < receive; i++)
	206	ps2dev->cmdbuf[(receive - 1) - i] = param[i];
	207	serio_continue_rx(ps2dev->serio);
	208
	209	/*
	210	* Some devices (Synaptics) peform the reset before
	211	* ACKing the reset command, and so it can take a long
83ae417b	212	* time before the ACK arrives.
1da177e4	213	*/
c611763d	214	if (ps2_sendbyte(ps2dev, command & 0xff,
218c1f76 DV	215	command == PS2_CMD_RESET_BAT ? 1000 : 200)) {
	216	serio_pause_rx(ps2dev->serio);
	217	goto out_reset_flags;
	218	}
1da177e4	219
218c1f76 DV	220	for (i = 0; i < send; i++) {
	221	if (ps2_sendbyte(ps2dev, param[i], 200)) {
	222	serio_pause_rx(ps2dev->serio);
	223	goto out_reset_flags;
	224	}
	225	}
1da177e4 LT	226
	227	/*
	228	* The reset command takes a long time to execute.
	229	*/
	230	timeout = msecs_to_jiffies(command == PS2_CMD_RESET_BAT ? 4000 : 500);
	231
	232	timeout = wait_event_timeout(ps2dev->wait,
	233	!(ps2dev->flags & PS2_FLAG_CMD1), timeout);
	234
a3ce6ea4	235	if (ps2dev->cmdcnt && !(ps2dev->flags & PS2_FLAG_CMD1)) {
1da177e4	236
905ab9d1	237	timeout = ps2_adjust_timeout(ps2dev, command, timeout);
1da177e4 LT	238	wait_event_timeout(ps2dev->wait,
	239	!(ps2dev->flags & PS2_FLAG_CMD), timeout);
	240	}
	241
218c1f76 DV	242	serio_pause_rx(ps2dev->serio);
218c1f76 DV	243
1da177e4 LT	244	if (param)
	245	for (i = 0; i < receive; i++)
	246	param[i] = ps2dev->cmdbuf[(receive - 1) - i];
	247
	248	if (ps2dev->cmdcnt && (command != PS2_CMD_RESET_BAT \|\| ps2dev->cmdcnt != 1))
218c1f76	249	goto out_reset_flags;
1da177e4 LT	250
	251	rc = 0;
	252
218c1f76	253	out_reset_flags:
1da177e4 LT	254	ps2dev->flags = 0;
	255	serio_continue_rx(ps2dev->serio);
	256
fc69f4a6 TL	257	return rc;
	258	}
	259	EXPORT_SYMBOL(__ps2_command);
	260
	261	int ps2_command(struct ps2dev ps2dev, unsigned char param, int command)
	262	{
	263	int rc;
	264
181d683d	265	ps2_begin_command(ps2dev);
fc69f4a6	266	rc = __ps2_command(ps2dev, param, command);
181d683d	267	ps2_end_command(ps2dev);
fc69f4a6	268
1da177e4 LT	269	return rc;
1da177e4 LT	270	}
5206c0d5	271	EXPORT_SYMBOL(ps2_command);
1da177e4	272
1da177e4 LT	273	/*
	274	* ps2_init() initializes ps2dev structure
	275	*/
	276
	277	void ps2_init(struct ps2dev ps2dev, struct serio serio)
	278	{
c4e32e9f	279	mutex_init(&ps2dev->cmd_mutex);
88aa0103	280	lockdep_set_subclass(&ps2dev->cmd_mutex, serio->depth);
1da177e4 LT	281	init_waitqueue_head(&ps2dev->wait);
	282	ps2dev->serio = serio;
	283	}
5206c0d5	284	EXPORT_SYMBOL(ps2_init);
1da177e4 LT	285
	286	/*
	287	* ps2_handle_ack() is supposed to be used in interrupt handler
	288	* to properly process ACK/NAK of a command from a PS/2 device.
	289	*/
	290
	291	int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
	292	{
	293	switch (data) {
	294	case PS2_RET_ACK:
	295	ps2dev->nak = 0;
	296	break;
	297
	298	case PS2_RET_NAK:
a2d781fc DT	299	ps2dev->flags \|= PS2_FLAG_NAK;
a2d781fc DT	300	ps2dev->nak = PS2_RET_NAK;
1da177e4 LT	301	break;
1da177e4 LT	302
a2d781fc DT	303	case PS2_RET_ERR:
	304	if (ps2dev->flags & PS2_FLAG_NAK) {
	305	ps2dev->flags &= ~PS2_FLAG_NAK;
	306	ps2dev->nak = PS2_RET_ERR;
	307	break;
	308	}
	309
1da177e4 LT	310	/*
	311	* Workaround for mice which don't ACK the Get ID command.
	312	* These are valid mouse IDs that we recognize.
	313	*/
	314	case 0x00:
	315	case 0x03:
	316	case 0x04:
	317	if (ps2dev->flags & PS2_FLAG_WAITID) {
	318	ps2dev->nak = 0;
	319	break;
	320	}
	321	/* Fall through */
	322	default:
	323	return 0;
	324	}
	325
	326
a2d781fc DT	327	if (!ps2dev->nak) {
	328	ps2dev->flags &= ~PS2_FLAG_NAK;
	329	if (ps2dev->cmdcnt)
	330	ps2dev->flags \|= PS2_FLAG_CMD \| PS2_FLAG_CMD1;
	331	}
1da177e4 LT	332
	333	ps2dev->flags &= ~PS2_FLAG_ACK;
	334	wake_up(&ps2dev->wait);
	335
	336	if (data != PS2_RET_ACK)
	337	ps2_handle_response(ps2dev, data);
	338
	339	return 1;
	340	}
5206c0d5	341	EXPORT_SYMBOL(ps2_handle_ack);
1da177e4 LT	342
	343	/*
	344	* ps2_handle_response() is supposed to be used in interrupt handler
	345	* to properly store device's response to a command and notify process
	346	* waiting for completion of the command.
	347	*/
	348
	349	int ps2_handle_response(struct ps2dev *ps2dev, unsigned char data)
	350	{
	351	if (ps2dev->cmdcnt)
	352	ps2dev->cmdbuf[--ps2dev->cmdcnt] = data;
	353
	354	if (ps2dev->flags & PS2_FLAG_CMD1) {
	355	ps2dev->flags &= ~PS2_FLAG_CMD1;
	356	if (ps2dev->cmdcnt)
	357	wake_up(&ps2dev->wait);
	358	}
	359
	360	if (!ps2dev->cmdcnt) {
	361	ps2dev->flags &= ~PS2_FLAG_CMD;
	362	wake_up(&ps2dev->wait);
	363	}
	364
	365	return 1;
	366	}
5206c0d5	367	EXPORT_SYMBOL(ps2_handle_response);
1da177e4 LT	368
	369	void ps2_cmd_aborted(struct ps2dev *ps2dev)
	370	{
	371	if (ps2dev->flags & PS2_FLAG_ACK)
	372	ps2dev->nak = 1;
	373
	374	if (ps2dev->flags & (PS2_FLAG_ACK \| PS2_FLAG_CMD))
	375	wake_up(&ps2dev->wait);
	376
a2d781fc DT	377	/* reset all flags except last nack */
a2d781fc DT	378	ps2dev->flags &= PS2_FLAG_NAK;
1da177e4	379	}
5206c0d5	380	EXPORT_SYMBOL(ps2_cmd_aborted);