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/*
* Copyright (c) 2009 Corey Tabaka
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <platform/keyboard.h>
#include <sys/types.h>
#include <err.h>
#include <reg.h>
#include <trace.h>
#include <debug.h>
#include <kernel/thread.h>
#include <platform.h>
#include <platform/interrupts.h>
#include <platform/console.h>
#include <platform/timer.h>
#include <platform/pc.h>
#include "platform_p.h"
#include <arch/x86.h>
#include <lib/cbuf.h>
static inline int i8042_read_data(void)
{
return inp(I8042_DATA_REG);
}
static inline int i8042_read_status(void)
{
return inp(I8042_STATUS_REG);
}
static inline void i8042_write_data(int val)
{
outp(I8042_DATA_REG, val);
}
static inline void i8042_write_command(int val)
{
outp(I8042_COMMAND_REG, val);
}
/*
* timeout in milliseconds
*/
#define I8042_CTL_TIMEOUT 500
/*
* status register bits
*/
#define I8042_STR_PARITY 0x80
#define I8042_STR_TIMEOUT 0x40
#define I8042_STR_AUXDATA 0x20
#define I8042_STR_KEYLOCK 0x10
#define I8042_STR_CMDDAT 0x08
#define I8042_STR_MUXERR 0x04
#define I8042_STR_IBF 0x02
#define I8042_STR_OBF 0x01
/*
* control register bits
*/
#define I8042_CTR_KBDINT 0x01
#define I8042_CTR_AUXINT 0x02
#define I8042_CTR_IGNKEYLK 0x08
#define I8042_CTR_KBDDIS 0x10
#define I8042_CTR_AUXDIS 0x20
#define I8042_CTR_XLATE 0x40
/*
* commands
*/
#define I8042_CMD_CTL_RCTR 0x0120
#define I8042_CMD_CTL_WCTR 0x1060
#define I8042_CMD_CTL_TEST 0x01aa
#define I8042_CMD_KBD_DIS 0x00ad
#define I8042_CMD_KBD_EN 0x00ae
#define I8042_CMD_KBD_TEST 0x01ab
#define I8042_CMD_KBD_MODE 0x01f0
/*
* used for flushing buffers. the i8042 internal buffer shoudn't exceed this.
*/
#define I8042_BUFFER_LENGTH 32
static inline void delay(lk_time_t delay)
{
lk_time_t start = current_time();
while (start + delay > current_time());
}
/* scancodes we want to do something with that don't translate via table */
#define SCANCODE_LSHIFT 0x2a
#define SCANCODE_RSHIFT 0x36
/* scancode translation tables */
static const int KeyCodeSingleLower[] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
-1, -1, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t', // 0
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\n', -1, 'a', 's', // 1
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`', -1,'\\', 'z', 'x', 'c', 'v', // 2
'b', 'n', 'm', ',', '.', '/', -1, '*', -1, ' ', -1, -1, -1, -1, -1, -1, // 3
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 4
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 5
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 6
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 7
};
static const int KeyCodeMultiLower[] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 1
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 2
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 3
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 4
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 5
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 6
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 7
};
static const int KeyCodeSingleUpper[] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
-1, -1, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t', // 0
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\n', -1, 'A', 'S', // 1
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', -1, '|', 'Z', 'X', 'C', 'V', // 2
'B', 'N', 'M', '<', '>', '?', -1, '*', -1, ' ', -1, -1, -1, -1, -1, -1, // 3
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 4
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 5
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 6
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 7
};
static const int KeyCodeMultiUpper[] = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 1
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 2
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 3
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 4
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 5
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 6
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 7
};
/*
* state key flags
*/
static bool key_lshift;
static bool key_rshift;
static cbuf_t *key_buf;
static void i8042_process_scode(uint8_t scode, unsigned int flags)
{
static int lastCode = 0;
int keyCode;
uint8_t keyUpBit;
bool multi = lastCode == 0xe0;
// save the key up event bit
keyUpBit = scode & 0x80;
scode &= 0x7f;
if (scode == SCANCODE_LSHIFT) {
key_lshift = !keyUpBit;
}
if (scode == SCANCODE_RSHIFT) {
key_rshift = !keyUpBit;
}
if (key_lshift || key_rshift) {
keyCode = multi ? KeyCodeMultiUpper[scode] : KeyCodeSingleUpper[scode];
} else {
keyCode = multi ? KeyCodeMultiLower[scode] : KeyCodeSingleLower[scode];
}
/*printf_xy(71, 3, BLUE, "%02x%02x %c %c%c", multi ? lastCode : 0, scode,
keyCode != -1 ? (char) keyCode : ' ', key_lshift ? 'L' : ' ',
key_rshift ? 'R' : ' ');*/
if (keyCode != -1 && !keyUpBit) {
char c = (char) keyCode;
cbuf_write_char(key_buf, c, false);
}
// update the last received code
lastCode = scode;
}
static int i8042_wait_read(void)
{
int i = 0;
while ((~i8042_read_status() & I8042_STR_OBF) && (i < I8042_CTL_TIMEOUT)) {
delay(1);
i++;
}
return -(i == I8042_CTL_TIMEOUT);
}
static int i8042_wait_write(void)
{
int i = 0;
while ((i8042_read_status() & I8042_STR_IBF) && (i < I8042_CTL_TIMEOUT)) {
delay(1);
i++;
}
return -(i == I8042_CTL_TIMEOUT);
}
static int i8042_flush(void)
{
unsigned char data __UNUSED;
int i = 0;
//enter_critical_section();
while ((i8042_read_status() & I8042_STR_OBF) && (i++ < I8042_BUFFER_LENGTH)) {
delay(1);
data = i8042_read_data();
}
//exit_critical_section();
return i;
}
static int i8042_command(uint8_t *param, int command)
{
int retval = 0, i = 0;
//enter_critical_section();
retval = i8042_wait_write();
if (!retval) {
i8042_write_command(command & 0xff);
}
if (!retval) {
for (i = 0; i < ((command >> 12) & 0xf); i++) {
if ((retval = i8042_wait_write())) {
break;
}
i8042_write_data(param[i]);
}
}
if (!retval) {
for (i = 0; i < ((command & 0xf0) >> 8); i++) {
if ((retval = i8042_wait_read())) {
break;
}
if (i8042_read_status() & I8042_STR_AUXDATA) {
param[i] = ~i8042_read_data();
} else {
param[i] = i8042_read_data();
}
}
}
//exit_critical_section();
return retval;
}
static enum handler_return i8042_interrupt(void *arg)
{
uint8_t str, data = 0;
bool resched = false;
//enter_critical_section();
str = i8042_read_status();
if (str & I8042_STR_OBF) {
data = i8042_read_data();
}
//exit_critical_section();
if (str & I8042_STR_OBF) {
i8042_process_scode(data,
((str & I8042_STR_PARITY) ? I8042_STR_PARITY : 0) |
((str & I8042_STR_TIMEOUT) ? I8042_STR_TIMEOUT : 0));
resched = true;
}
return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE;
}
int platform_read_key(char *c)
{
ssize_t len;
len = cbuf_read_char(key_buf, c, true);
return len;
}
void platform_init_keyboard(cbuf_t *buffer)
{
uint8_t ctr;
key_buf = buffer;
i8042_flush();
if (i8042_command(&ctr, I8042_CMD_CTL_RCTR)) {
dprintf(SPEW, "Failed to read CTR while initializing i8042\n");
return;
}
// turn on translation
ctr |= I8042_CTR_XLATE;
// enable keyboard and keyboard irq
ctr &= ~I8042_CTR_KBDDIS;
ctr |= I8042_CTR_KBDINT;
if (i8042_command(&ctr, I8042_CMD_CTL_WCTR)) {
dprintf(SPEW, "Failed to write CTR while initializing i8042\n");
return;
}
register_int_handler(INT_KEYBOARD, &i8042_interrupt, NULL);
unmask_interrupt(INT_KEYBOARD);
i8042_interrupt(NULL);
}
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