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