74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
#include <stdint.h>
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#include <sys.h>
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#include "ps2ctrl.h"
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#include "../panic.h"
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#include "../interrupt/pic.h"
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#define STATUS_OUT_BUF ((uint8_t)0x01)
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#define STATUS_IN_BUF ((uint8_t)0x02)
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#define CONFIG_INT_0 ((uint8_t)0x01)
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#define CONFIG_INT_1 ((uint8_t)0x02)
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#define CONFIG_SYS ((uint8_t)0x04)
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#define CONFIG_CLOCK_0 ((uint8_t)0x10)
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#define CONFIG_CLOCK_1 ((uint8_t)0x20)
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#define CONFIG_TRANS ((uint8_t)0x40)
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uint8_t ps2ctrl_in_status(void) {
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return inb(0x64);
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}
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uint8_t ps2ctrl_in(void) {
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while((ps2ctrl_in_status() & STATUS_OUT_BUF) == 0) {
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io_wait();
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}
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return inb(0x60);
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}
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void ps2ctrl_out_cmd(uint8_t cmd) {
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while((ps2ctrl_in_status() & STATUS_IN_BUF) != 0) {
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io_wait();
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}
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outb(0x64, cmd);
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}
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void ps2ctrl_out_data(uint8_t data) {
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while((ps2ctrl_in_status() & STATUS_IN_BUF) != 0) {
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io_wait();
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}
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outb(0x60, data);
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}
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static bool is_init = false;
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void ps2ctrl_init(void) {
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is_init = false;
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pic_mask(1);
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// clear buffer
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inb(0x60);
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// self-test
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ps2ctrl_out_cmd(0xAA);
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uint8_t response = ps2ctrl_in();
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if(response != 0x55) {
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panic("PS/2 controller failed to initialize");
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}
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// set config
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ps2ctrl_out_cmd(0x20);
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uint8_t config = ps2ctrl_in();
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config = (config | CONFIG_INT_0) & ~CONFIG_TRANS & ~CONFIG_INT_1;
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ps2ctrl_out_cmd(0x60);
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ps2ctrl_out_data(config);
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// enable port 0
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ps2ctrl_out_cmd(0xAE);
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pic_unmask(1);
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is_init = true;
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}
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bool ps2ctrl_is_init(void) {
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return is_init;
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}
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