379 lines
8.5 KiB
C
379 lines
8.5 KiB
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)
|
||
|
|
{
|
||
|
|
struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
|
||
|
|
|
||
|
|
mutex_lock(m);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(ps2_begin_command);
|
||
|
|
|
||
|
|
void ps2_end_command(struct ps2dev *ps2dev)
|
||
|
|
{
|
||
|
|
struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
|
||
|
|
|
||
|
|
mutex_unlock(m);
|
||
|
|
}
|
||
|
|
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);
|