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/*
* Copyright (C) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup genarch
* @{
*/
/**
* @file
* @brief i8042 processor driver.
*
* It takes care of low-level keyboard functions.
*/
#include <genarch/i8042/i8042.h>
#include <arch/drivers/i8042.h>
#include <arch/interrupt.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <synch/spinlock.h>
#include <typedefs.h>
#include <console/chardev.h>
#include <console/console.h>
#include <macros.h>
#include <interrupt.h>
/* Keyboard commands. */
#define KBD_ENABLE 0xf4
#define KBD_DISABLE 0xf5
#define KBD_ACK 0xfa
/*
* 60 Write 8042 Command Byte: next data byte written to port 60h is
* placed in 8042 command register. Format:
*
* |7|6|5|4|3|2|1|0|8042 Command Byte
* | | | | | | | `---- 1=enable output register full interrupt
* | | | | | | `----- should be 0
* | | | | | `------ 1=set status register system, 0=clear
* | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
* | | | `-------- disable keyboard I/O by driving clock line low
* | | `--------- disable auxiliary device, drives clock line low
* | `---------- IBM scancode translation 0=AT, 1=PC/XT
* `----------- reserved, should be 0
*/
#define i8042_SET_COMMAND 0x60
#define i8042_COMMAND 0x49
#define i8042_BUFFER_FULL_MASK 0x01
#define i8042_WAIT_MASK 0x02
#define SPECIAL '?'
#define KEY_RELEASE 0x80
/**
* These codes read from i8042 data register are silently ignored.
*/
#define IGNORE_CODE 0x7f
static void key_released(__u8 sc);
static void key_pressed(__u8 sc);
static char key_read(chardev_t *d);
#define PRESSED_SHIFT (1<<0)
#define PRESSED_CAPSLOCK (1<<1)
#define LOCKED_CAPSLOCK (1<<0)
#define ACTIVE_READ_BUFF_SIZE 16 /* Must be power of 2 */
static __u8 active_read_buff[ACTIVE_READ_BUFF_SIZE];
SPINLOCK_INITIALIZE(keylock); /**< keylock protects keyflags and lockflags. */
static volatile int keyflags; /**< Tracking of multiple keypresses. */
static volatile int lockflags; /**< Tracking of multiple keys lockings. */
static void i8042_suspend(chardev_t *);
static void i8042_resume(chardev_t *);
static chardev_t kbrd;
static chardev_operations_t ops = {
.suspend = i8042_suspend,
.resume = i8042_resume,
.read = key_read
};
/** Primary meaning of scancodes. */
static char sc_primary_map[] = {
SPECIAL, /* 0x00 */
SPECIAL, /* 0x01 - Esc */
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',
'\b', /* 0x0e - Backspace */
'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
SPECIAL, /* 0x1d - LCtrl */
'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'',
'`',
SPECIAL, /* 0x2a - LShift */
'\\',
'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
SPECIAL, /* 0x36 - RShift */
'*',
SPECIAL, /* 0x38 - LAlt */
' ',
SPECIAL, /* 0x3a - CapsLock */
SPECIAL, /* 0x3b - F1 */
SPECIAL, /* 0x3c - F2 */
SPECIAL, /* 0x3d - F3 */
SPECIAL, /* 0x3e - F4 */
SPECIAL, /* 0x3f - F5 */
SPECIAL, /* 0x40 - F6 */
SPECIAL, /* 0x41 - F7 */
SPECIAL, /* 0x42 - F8 */
SPECIAL, /* 0x43 - F9 */
SPECIAL, /* 0x44 - F10 */
SPECIAL, /* 0x45 - NumLock */
SPECIAL, /* 0x46 - ScrollLock */
'7', '8', '9', '-',
'4', '5', '6', '+',
'1', '2', '3',
'0', '.',
SPECIAL, /* 0x54 - Alt-SysRq */
SPECIAL, /* 0x55 - F11/F12/PF1/FN */
SPECIAL, /* 0x56 - unlabelled key next to LAlt */
SPECIAL, /* 0x57 - F11 */
SPECIAL, /* 0x58 - F12 */
SPECIAL, /* 0x59 */
SPECIAL, /* 0x5a */
SPECIAL, /* 0x5b */
SPECIAL, /* 0x5c */
SPECIAL, /* 0x5d */
SPECIAL, /* 0x5e */
SPECIAL, /* 0x5f */
SPECIAL, /* 0x60 */
SPECIAL, /* 0x61 */
SPECIAL, /* 0x62 */
SPECIAL, /* 0x63 */
SPECIAL, /* 0x64 */
SPECIAL, /* 0x65 */
SPECIAL, /* 0x66 */
SPECIAL, /* 0x67 */
SPECIAL, /* 0x68 */
SPECIAL, /* 0x69 */
SPECIAL, /* 0x6a */
SPECIAL, /* 0x6b */
SPECIAL, /* 0x6c */
SPECIAL, /* 0x6d */
SPECIAL, /* 0x6e */
SPECIAL, /* 0x6f */
SPECIAL, /* 0x70 */
SPECIAL, /* 0x71 */
SPECIAL, /* 0x72 */
SPECIAL, /* 0x73 */
SPECIAL, /* 0x74 */
SPECIAL, /* 0x75 */
SPECIAL, /* 0x76 */
SPECIAL, /* 0x77 */
SPECIAL, /* 0x78 */
SPECIAL, /* 0x79 */
SPECIAL, /* 0x7a */
SPECIAL, /* 0x7b */
SPECIAL, /* 0x7c */
SPECIAL, /* 0x7d */
SPECIAL, /* 0x7e */
SPECIAL, /* 0x7f */
};
/** Secondary meaning of scancodes. */
static char sc_secondary_map[] = {
SPECIAL, /* 0x00 */
SPECIAL, /* 0x01 - Esc */
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
SPECIAL, /* 0x0e - Backspace */
'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
SPECIAL, /* 0x1d - LCtrl */
'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"',
'~',
SPECIAL, /* 0x2a - LShift */
'|',
'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
SPECIAL, /* 0x36 - RShift */
'*',
SPECIAL, /* 0x38 - LAlt */
' ',
SPECIAL, /* 0x3a - CapsLock */
SPECIAL, /* 0x3b - F1 */
SPECIAL, /* 0x3c - F2 */
SPECIAL, /* 0x3d - F3 */
SPECIAL, /* 0x3e - F4 */
SPECIAL, /* 0x3f - F5 */
SPECIAL, /* 0x40 - F6 */
SPECIAL, /* 0x41 - F7 */
SPECIAL, /* 0x42 - F8 */
SPECIAL, /* 0x43 - F9 */
SPECIAL, /* 0x44 - F10 */
SPECIAL, /* 0x45 - NumLock */
SPECIAL, /* 0x46 - ScrollLock */
'7', '8', '9', '-',
'4', '5', '6', '+',
'1', '2', '3',
'0', '.',
SPECIAL, /* 0x54 - Alt-SysRq */
SPECIAL, /* 0x55 - F11/F12/PF1/FN */
SPECIAL, /* 0x56 - unlabelled key next to LAlt */
SPECIAL, /* 0x57 - F11 */
SPECIAL, /* 0x58 - F12 */
SPECIAL, /* 0x59 */
SPECIAL, /* 0x5a */
SPECIAL, /* 0x5b */
SPECIAL, /* 0x5c */
SPECIAL, /* 0x5d */
SPECIAL, /* 0x5e */
SPECIAL, /* 0x5f */
SPECIAL, /* 0x60 */
SPECIAL, /* 0x61 */
SPECIAL, /* 0x62 */
SPECIAL, /* 0x63 */
SPECIAL, /* 0x64 */
SPECIAL, /* 0x65 */
SPECIAL, /* 0x66 */
SPECIAL, /* 0x67 */
SPECIAL, /* 0x68 */
SPECIAL, /* 0x69 */
SPECIAL, /* 0x6a */
SPECIAL, /* 0x6b */
SPECIAL, /* 0x6c */
SPECIAL, /* 0x6d */
SPECIAL, /* 0x6e */
SPECIAL, /* 0x6f */
SPECIAL, /* 0x70 */
SPECIAL, /* 0x71 */
SPECIAL, /* 0x72 */
SPECIAL, /* 0x73 */
SPECIAL, /* 0x74 */
SPECIAL, /* 0x75 */
SPECIAL, /* 0x76 */
SPECIAL, /* 0x77 */
SPECIAL, /* 0x78 */
SPECIAL, /* 0x79 */
SPECIAL, /* 0x7a */
SPECIAL, /* 0x7b */
SPECIAL, /* 0x7c */
SPECIAL, /* 0x7d */
SPECIAL, /* 0x7e */
SPECIAL, /* 0x7f */
};
static void i8042_interrupt(int n, istate_t *istate);
static void i8042_wait(void);
static iroutine oldvector;
/** Initialize keyboard and service interrupts using kernel routine */
void i8042_grab(void)
{
oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
i8042_wait();
i8042_command_write(i8042_SET_COMMAND);
i8042_wait();
i8042_data_write(i8042_COMMAND);
i8042_wait();
}
/** Resume the former interrupt vector */
void i8042_release(void)
{
if (oldvector)
exc_register(VECTOR_KBD, "user_interrupt", oldvector);
}
/** Initialize i8042. */
void i8042_init(void)
{
int i;
i8042_grab();
/* Prevent user from accidentaly releasing calling i8042_resume
* and disabling keyboard
*/
oldvector = NULL;
trap_virtual_enable_irqs(1<<IRQ_KBD);
chardev_initialize("i8042_kbd", &kbrd, &ops);
stdin = &kbrd;
/*
* Clear input buffer.
* Number of iterations is limited to prevent infinite looping.
*/
for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
i8042_data_read();
}
}
/** Process i8042 interrupt.
*
* @param n Interrupt vector.
* @param istate Interrupted state.
*/
void i8042_interrupt(int n, istate_t *istate)
{
__u8 x;
while ((i8042_status_read() & i8042_BUFFER_FULL_MASK)) {
x = i8042_data_read();
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
key_pressed(x);
}
trap_virtual_eoi();
}
/** Wait until the controller reads its data. */
void i8042_wait(void) {
while (i8042_status_read() & i8042_WAIT_MASK) {
/* wait */
}
}
/** Process release of key.
*
* @param sc Scancode of the key being released.
*/
void key_released(__u8 sc)
{
spinlock_lock(&keylock);
switch (sc) {
case SC_LSHIFT:
case SC_RSHIFT:
keyflags &= ~PRESSED_SHIFT;
break;
case SC_CAPSLOCK:
keyflags &= ~PRESSED_CAPSLOCK;
if (lockflags & LOCKED_CAPSLOCK)
lockflags &= ~LOCKED_CAPSLOCK;
else
lockflags |= LOCKED_CAPSLOCK;
break;
default:
break;
}
spinlock_unlock(&keylock);
}
/** Process keypress.
*
* @param sc Scancode of the key being pressed.
*/
void key_pressed(__u8 sc)
{
char *map = sc_primary_map;
char ascii = sc_primary_map[sc];
bool shift, capslock;
bool letter = false;
spinlock_lock(&keylock);
switch (sc) {
case SC_LSHIFT:
case SC_RSHIFT:
keyflags |= PRESSED_SHIFT;
break;
case SC_CAPSLOCK:
keyflags |= PRESSED_CAPSLOCK;
break;
case SC_SPEC_ESCAPE:
break;
case SC_LEFTARR:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x5b);
chardev_push_character(&kbrd, 0x44);
break;
case SC_RIGHTARR:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x5b);
chardev_push_character(&kbrd, 0x43);
break;
case SC_UPARR:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x5b);
chardev_push_character(&kbrd, 0x41);
break;
case SC_DOWNARR:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x5b);
chardev_push_character(&kbrd, 0x42);
break;
case SC_HOME:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x4f);
chardev_push_character(&kbrd, 0x48);
break;
case SC_END:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x4f);
chardev_push_character(&kbrd, 0x46);
break;
case SC_DELETE:
chardev_push_character(&kbrd, 0x1b);
chardev_push_character(&kbrd, 0x5b);
chardev_push_character(&kbrd, 0x33);
chardev_push_character(&kbrd, 0x7e);
break;
default:
letter = is_lower(ascii);
capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
shift = keyflags & PRESSED_SHIFT;
if (letter && capslock)
shift = !shift;
if (shift)
map = sc_secondary_map;
chardev_push_character(&kbrd, map[sc]);
break;
}
spinlock_unlock(&keylock);
}
/* Called from getc(). */
void i8042_resume(chardev_t *d)
{
}
/* Called from getc(). */
void i8042_suspend(chardev_t *d)
{
}
static __u8 active_read_buff_read(void)
{
static int i=0;
i &= (ACTIVE_READ_BUFF_SIZE-1);
if(!active_read_buff[i]) {
return 0;
}
return active_read_buff[i++];
}
static void active_read_buff_write(__u8 ch)
{
static int i=0;
active_read_buff[i] = ch;
i++;
i &= (ACTIVE_READ_BUFF_SIZE-1);
active_read_buff[i]=0;
}
static void active_read_key_pressed(__u8 sc)
{
char *map = sc_primary_map;
char ascii = sc_primary_map[sc];
bool shift, capslock;
bool letter = false;
/*spinlock_lock(&keylock);*/
switch (sc) {
case SC_LSHIFT:
case SC_RSHIFT:
keyflags |= PRESSED_SHIFT;
break;
case SC_CAPSLOCK:
keyflags |= PRESSED_CAPSLOCK;
break;
case SC_SPEC_ESCAPE:
break;
case SC_LEFTARR:
active_read_buff_write(0x1b);
active_read_buff_write(0x5b);
active_read_buff_write(0x44);
break;
case SC_RIGHTARR:
active_read_buff_write(0x1b);
active_read_buff_write(0x5b);
active_read_buff_write(0x43);
break;
case SC_UPARR:
active_read_buff_write(0x1b);
active_read_buff_write(0x5b);
active_read_buff_write(0x41);
break;
case SC_DOWNARR:
active_read_buff_write(0x1b);
active_read_buff_write(0x5b);
active_read_buff_write(0x42);
break;
case SC_HOME:
active_read_buff_write(0x1b);
active_read_buff_write(0x4f);
active_read_buff_write(0x48);
break;
case SC_END:
active_read_buff_write(0x1b);
active_read_buff_write(0x4f);
active_read_buff_write(0x46);
break;
case SC_DELETE:
active_read_buff_write(0x1b);
active_read_buff_write(0x5b);
active_read_buff_write(0x33);
active_read_buff_write(0x7e);
break;
default:
letter = is_lower(ascii);
capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK);
shift = keyflags & PRESSED_SHIFT;
if (letter && capslock)
shift = !shift;
if (shift)
map = sc_secondary_map;
active_read_buff_write(map[sc]);
break;
}
/*spinlock_unlock(&keylock);*/
}
static char key_read(chardev_t *d)
{
char ch;
while(!(ch = active_read_buff_read())) {
__u8 x;
while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
;
x = i8042_data_read();
if (x != IGNORE_CODE) {
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
active_read_key_pressed(x);
}
}
return ch;
}
/** Poll for key press and release events.
*
* This function can be used to implement keyboard polling.
*/
void i8042_poll(void)
{
__u8 x;
while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
x = i8042_data_read();
if (x != IGNORE_CODE) {
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
key_pressed(x);
}
}
}
/** @}
*/