root / lab4 / kbc.c @ 68
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#include <lcom/lcf.h> |
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#include "kbc.h" |
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#include "kbc_macros.h" |
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#include "utils.h" |
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#include "errors.h" |
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int (unsubscribe_interrupt)(int *interrupt_id) { |
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if (interrupt_id == NULL) return NULL_PTR; |
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if(sys_irqrmpolicy(interrupt_id)) return UNSBCR_ERROR; |
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return SUCCESS;
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} |
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int (kbc_read_cmd)(uint8_t *cmd){
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int ret = 0; |
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if((ret = kbc_issue_cmd(READ_KBC_CMD))) return ret; |
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if((ret = kbc_read_byte(cmd))) return ret; |
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return SUCCESS;
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} |
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int (kbc_change_cmd)(uint8_t cmd){
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int ret = 0; |
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if((ret = kbc_issue_cmd(WRITE_KBC_CMD))) return ret; |
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if((ret = kbc_issue_arg(cmd))) return ret; |
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return SUCCESS;
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} |
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int (kbc_restore_kbd)(){
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int ret = 0; |
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uint8_t cmd = 0;
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if((ret = kbc_read_cmd(&cmd))) return ret; |
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cmd = (cmd | INT_KBD) & (~DIS_KBD) ; |
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if((ret = kbc_change_cmd(cmd))) return ret; |
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return SUCCESS;
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} |
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int (kbc_issue_cmd)(uint8_t cmd){
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int ret = 0; |
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uint8_t stat; |
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for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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if((stat&IN_BUF_FULL) == 0){ |
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if(sys_outb(KBC_CMD, cmd)) return WRITE_ERROR; |
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return SUCCESS;
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} |
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tickdelay(micros_to_ticks(DELAY)); |
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} |
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return TIMEOUT_ERROR;
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} |
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int (kbc_issue_arg)(uint8_t arg){
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int ret = 0; |
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uint8_t stat; |
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for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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if((stat&IN_BUF_FULL) == 0){ |
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if(sys_outb(KBC_CMD_ARG, arg)) return WRITE_ERROR; |
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return SUCCESS;
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} |
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tickdelay(micros_to_ticks(DELAY)); |
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} |
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return TIMEOUT_ERROR;
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} |
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int (kbc_read_byte)(uint8_t *byte){
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int ret = 0; |
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uint8_t stat; |
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for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
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if((ret = util_sys_inb(OUTPUT_BUF, byte))) return ret; |
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else return SUCCESS; |
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} |
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tickdelay(micros_to_ticks(DELAY)); |
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} |
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return TIMEOUT_ERROR;
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} |