toaruos/modules/ps2kbd.c
2018-03-19 11:38:11 +09:00

82 lines
1.7 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2011-2015 Kevin Lange
*
* Low-level keyboard interrupt driver.
*
* Creates a device file (keyboard_pipe) that can be read
* to retreive keyboard events.
*
*/
#include <kernel/system.h>
#include <kernel/logging.h>
#include <kernel/fs.h>
#include <kernel/pipe.h>
#include <kernel/process.h>
#include <kernel/module.h>
#define KEY_DEVICE 0x60
#define KEY_PENDING 0x64
#define KEY_IRQ 1
static fs_node_t * keyboard_pipe;
/*
* Wait on the keyboard.
*/
static void keyboard_wait(void) {
while(inportb(KEY_PENDING) & 2);
}
/*
* Keyboard interrupt callback
*/
static int keyboard_handler(struct regs *r) {
unsigned char scancode;
if (inportb(KEY_PENDING) & 0x01) {
scancode = inportb(KEY_DEVICE);
write_fs(keyboard_pipe, 0, 1, (uint8_t []){scancode});
}
irq_ack(KEY_IRQ);
return 1;
}
/*
* Install the keyboard driver and initialize the
* pipe device for userspace.
*/
static int keyboard_install(void) {
debug_print(NOTICE, "Initializing PS/2 keyboard driver");
/* Create a device pipe */
keyboard_pipe = make_pipe(128);
current_process->fds->entries[0] = keyboard_pipe;
keyboard_pipe->flags = FS_CHARDEVICE;
vfs_mount("/dev/kbd", keyboard_pipe);
/* Install the interrupt handler */
irq_install_handler(KEY_IRQ, keyboard_handler);
return 0;
}
static void keyboard_reset_ps2(void) {
uint8_t tmp = inportb(0x61);
outportb(0x61, tmp | 0x80);
outportb(0x61, tmp & 0x7F);
inportb(KEY_DEVICE);
}
static int keyboard_uninstall(void) {
/* TODO */
return 0;
}
MODULE_DEF(ps2kbd, keyboard_install, keyboard_uninstall);