[GitHub/mt8127/android_kernel_alcatel_ttab.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/init.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 arrrives.
	 */
	if (ps2_sendbyte(ps2dev, command & 0xff,
			 command == PS2_CMD_RESET_BAT ? 1000 : 200))
		goto out;

	for (i = 0; i < send; i++)
		if (ps2_sendbyte(ps2dev, param[i], 200))
			goto out;

	/*
	 * 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);
	}

	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;

	rc = 0;

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