root / lab5 / kbc.c @ 173
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| 1 | 109 | up20180655 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include "kbc.h" |
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| 4 | |||
| 5 | #include "kbc_macros.h" |
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| 6 | #include "utils.h" |
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| 7 | #include "errors.h" |
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| 8 | |||
| 9 | int (unsubscribe_interrupt)(int *interrupt_id) { |
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| 10 | if (interrupt_id == NULL) return NULL_PTR; |
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| 11 | if(sys_irqrmpolicy(interrupt_id)) return UNSBCR_ERROR; |
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| 12 | return SUCCESS;
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| 13 | } |
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| 14 | |||
| 15 | int (kbc_read_cmd)(uint8_t *cmd){
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| 16 | int ret = 0; |
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| 17 | if((ret = kbc_issue_cmd(READ_KBC_CMD))) return ret; |
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| 18 | if((ret = kbc_read_byte(cmd))) return ret; |
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| 19 | return SUCCESS;
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| 20 | } |
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| 21 | |||
| 22 | int (kbc_change_cmd)(uint8_t cmd){
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| 23 | int ret = 0; |
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| 24 | if((ret = kbc_issue_cmd(WRITE_KBC_CMD))) return ret; |
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| 25 | if((ret = kbc_issue_arg(cmd))) return ret; |
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| 26 | return SUCCESS;
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| 27 | } |
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| 28 | |||
| 29 | int (kbc_restore_kbd)(){
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| 30 | int ret = 0; |
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| 31 | uint8_t cmd = 0;
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| 32 | if((ret = kbc_read_cmd(&cmd))) return ret; |
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| 33 | cmd = (cmd | INT_KBD) & (~DIS_KBD); |
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| 34 | if((ret = kbc_change_cmd(cmd))) return ret; |
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| 35 | return SUCCESS;
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| 36 | } |
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| 37 | |||
| 38 | int (kbc_issue_cmd)(uint8_t cmd){
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| 39 | int ret = 0; |
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| 40 | uint8_t stat; |
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| 41 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 42 | if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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| 43 | if((stat&IN_BUF_FULL) == 0){ |
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| 44 | if(sys_outb(KBC_CMD, cmd)) return WRITE_ERROR; |
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| 45 | return SUCCESS;
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| 46 | } |
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| 47 | tickdelay(micros_to_ticks(DELAY)); |
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| 48 | } |
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| 49 | return TIMEOUT_ERROR;
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| 50 | } |
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| 51 | |||
| 52 | int (kbc_issue_arg)(uint8_t arg){
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| 53 | int ret = 0; |
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| 54 | uint8_t stat; |
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| 55 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 56 | if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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| 57 | if((stat&IN_BUF_FULL) == 0){ |
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| 58 | if(sys_outb(KBC_CMD_ARG, arg)) return WRITE_ERROR; |
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| 59 | return SUCCESS;
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| 60 | } |
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| 61 | tickdelay(micros_to_ticks(DELAY)); |
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| 62 | } |
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| 63 | return TIMEOUT_ERROR;
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| 64 | } |
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| 65 | |||
| 66 | int (kbc_read_byte)(uint8_t *byte){
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| 67 | int ret = 0; |
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| 68 | uint8_t stat; |
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| 69 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 70 | if((ret = util_sys_inb(STATUS_REG, &stat))) return ret; |
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| 71 | if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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| 72 | if(stat & (PARITY_ERROR | TIME_OUT_REC)) return OTHER_ERROR; |
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| 73 | if((ret = util_sys_inb(OUTPUT_BUF, byte))) return ret; |
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| 74 | else return SUCCESS; |
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| 75 | } |
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| 76 | tickdelay(micros_to_ticks(DELAY)); |
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| 77 | } |
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| 78 | printf("Timing out\n");
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| 79 | return TIMEOUT_ERROR;
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| 80 | } |