root / lab3 / kbc_func.c @ 48
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| 1 | 47 | up20180642 | #include "kbc_func.h" |
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| 2 | #include "kbc.h" |
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| 3 | |||
| 4 | #include <lcom/lcf.h> |
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| 5 | |||
| 6 | int (subscribe_kbc_interrupt)(uint8_t interrupt_bit, int *interrupt_id) { |
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| 7 | if (interrupt_id == NULL) return 1; |
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| 8 | *interrupt_id = interrupt_bit; |
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| 9 | return (sys_irqsetpolicy(KBC_IRQ, IRQ_REENABLE | IRQ_EXCLUSIVE, interrupt_id));
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| 10 | } |
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| 11 | |||
| 12 | int (unsubscribe_interrupt)(int *interrupt_id) { |
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| 13 | if (interrupt_id == NULL) return 1; |
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| 14 | return sys_irqrmpolicy(interrupt_id);
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| 15 | } |
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| 16 | |||
| 17 | uint8_t scancode[2];
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| 18 | int got_error = 0; |
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| 19 | 48 | up20180655 | int done = 0; |
| 20 | int sz = 1; |
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| 21 | 47 | up20180642 | |
| 22 | void (kbc_ih)(void) { |
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| 23 | uint8_t status = 0;
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| 24 | got_error = 0;
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| 25 | |||
| 26 | if (util_sys_inb(STATUS_REG, &status)) {
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| 27 | got_error = 1;
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| 28 | return;
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| 29 | } |
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| 30 | |||
| 31 | if (status & (TIME_OUT_REC | PARITY_ERROR)) {
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| 32 | got_error = 1;
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| 33 | return;
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| 34 | } |
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| 35 | |||
| 36 | uint8_t byte = 0;
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| 37 | |||
| 38 | if (util_sys_inb(OUTPUT_BUF, &byte)) {
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| 39 | got_error = 1;
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| 40 | return;
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| 41 | } |
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| 42 | |||
| 43 | 48 | up20180655 | if (sz == 2 && done == 0) { |
| 44 | 47 | up20180642 | scancode[1] = byte;
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| 45 | 48 | up20180655 | done = 1;
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| 46 | 47 | up20180642 | } else {
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| 47 | scancode[0] = byte;
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| 48 | 48 | up20180655 | if (byte == TWO_BYTE_CODE) {
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| 49 | sz = 2;
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| 50 | done = 0;
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| 51 | } else {
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| 52 | sz = 1;
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| 53 | done = 1;
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| 54 | } |
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| 55 | 47 | up20180642 | } |
| 56 | |||
| 57 | } |
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| 58 | |||
| 59 | int (kbd_poll)(uint8_t bytes[], uint8_t *size){
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| 60 | if(bytes == NULL || size == NULL) return 1; |
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| 61 | uint8_t c; |
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| 62 | if(kbc_read_byte(&c)) return 1; |
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| 63 | if(c == TWO_BYTE_CODE){
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| 64 | if(kbc_read_byte(&bytes[1])) return 1; |
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| 65 | bytes[0] = c;
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| 66 | *size = 2;
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| 67 | }else{
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| 68 | bytes[1] = 0; |
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| 69 | bytes[0] = c;
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| 70 | *size = 1;
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| 71 | } |
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| 72 | return 0; |
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| 73 | } |
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| 74 | |||
| 75 | int (kbc_read_cmd)(uint8_t *cmd){
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| 76 | if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
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| 77 | if(kbc_read_byte(cmd)) return 1; |
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| 78 | return 0; |
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| 79 | } |
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| 80 | |||
| 81 | int (kbc_change_cmd)(uint8_t cmd){
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| 82 | if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
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| 83 | if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
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| 84 | return 0; |
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| 85 | } |
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| 86 | |||
| 87 | int (kbc_restore_kbd)(){
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| 88 | uint8_t cmd = 0;
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| 89 | if(kbc_read_cmd(&cmd)) return 1; |
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| 90 | cmd = (cmd | INT_KBD) & (~DIS_KBD); |
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| 91 | if(kbc_change_cmd(cmd)) return 1; |
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| 92 | return 0; |
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| 93 | } |
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| 94 | |||
| 95 | int (kbc_issue_cmd)(uint8_t cmd){
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| 96 | uint8_t stat; |
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| 97 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 98 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 99 | if((stat&IN_BUF_FULL) == 0){ |
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| 100 | if(sys_outb(KBC_CMD, cmd)) return 1; |
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| 101 | return 0; |
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| 102 | } |
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| 103 | tickdelay(micros_to_ticks(DELAY)); |
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| 104 | } |
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| 105 | return 1; |
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| 106 | } |
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| 107 | |||
| 108 | int (kbc_read_byte)(uint8_t *byte){
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| 109 | uint8_t stat; |
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| 110 | while(true){ |
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| 111 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 112 | if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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| 113 | if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
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| 114 | if(util_sys_inb(OUTPUT_BUF, byte)) return 1; |
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| 115 | else return 0; |
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| 116 | } |
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| 117 | tickdelay(micros_to_ticks(DELAY)); |
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| 118 | } |
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| 119 | } |