86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* Low-level keyboard interrupt driver.
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*
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* Creates a device file (keyboard_pipe) that can be read
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* to retreive keyboard events.
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*
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* Part of the ToAruOS Kernel
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* Copyright 2011-2014 Kevin Lange
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*/
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#include <system.h>
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#include <logging.h>
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#include <fs.h>
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#include <pipe.h>
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#include <process.h>
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#include <module.h>
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#define KEY_DEVICE 0x60
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#define KEY_PENDING 0x64
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#define KEYBOARD_NOTICES 0
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#define KEYBOARD_IRQ 1
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static fs_node_t * keyboard_pipe;
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/*
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* Add a character to the device buffer.
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*/
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static void putch(unsigned char c) {
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uint8_t buf[2];
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buf[0] = c;
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buf[1] = '\0';
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write_fs(keyboard_pipe, 0, 1, buf);
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}
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/*
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* Wait on the keyboard.
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*/
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static void keyboard_wait(void) {
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while(inportb(KEY_PENDING) & 2);
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}
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static void keyboard_handler(struct regs *r) {
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unsigned char scancode;
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keyboard_wait();
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scancode = inportb(KEY_DEVICE);
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irq_ack(KEYBOARD_IRQ);
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putch(scancode);
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}
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/*
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* Install the keyboard driver and initialize the
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* pipe device for userspace.
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*/
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static int keyboard_install(void) {
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debug_print(NOTICE, "Initializing PS/2 keyboard driver");
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/* Create a device pipe */
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keyboard_pipe = make_pipe(128);
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current_process->fds->entries[0] = keyboard_pipe;
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vfs_mount("/dev/kbd", keyboard_pipe);
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/* Install the interrupt handler */
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irq_install_handler(KEYBOARD_IRQ, keyboard_handler);
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return 0;
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}
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static void keyboard_reset_ps2(void) {
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uint8_t tmp = inportb(0x61);
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outportb(0x61, tmp | 0x80);
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outportb(0x61, tmp & 0x7F);
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inportb(KEY_DEVICE);
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}
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static int keyboard_uninstall(void) {
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/* TODO */
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return 0;
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}
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MODULE_DEF(ps2kbd, keyboard_install, keyboard_uninstall);
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