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¡¾Ç³ÎölinuxÏÂÊó±êÇý¶¯µÄʵÏÖ¡¿
 input_init()=>
=>
class_register(&input_class);×¢²áinputÀà
input_proc_init();´´½¨procϵÄĿ¼ºÍÎļþ
register_chrdev(INPUT_MAJOR, "input", &input_fops);×¢²áÇý¶¯³ÌÐòµ½cdev_mapÉÏ,ÒÔ´ýÇý¶¯É豸.
drivers\input\keyboard\pxa3xx_keypad.cΪÎÒÃǵÄkeyboardÉ豸,
pxa3xx_keypad_probe=>
request_irq(IRQ_ENHROT, &enhanced_rotary_interrupt,
            IRQF_DISABLED, "Enhanced Rotary", (void *)keypad);×¢²á¿ì½Ý¼üÖжÏ
request_irq(IRQ_KEYPAD, pxa3xx_keypad_interrupt, IRQF_DISABLED,pdev->name, keypad);×¢²áÖжÏ
static irqreturn_t pxa3xx_keypad_interrupt(int irq, void *dev_id)
{
    struct pxa3xx_keypad *keypad = dev_id;
    uint32_t kpc = keypad_readl(KPC);
    if (kpc & KPC_MI)
        pxa3xx_keypad_scan_matrix(keypad);
    if (kpc & KPC_DI)
        pxa3xx_keypad_scan_direct(keypad);
    return IRQ_HANDLED;
}
ÔÚirqÖÐÈç¹û¶Áµ½ÁËkey,ÄÇô»áÖ±½Óµ÷ÓÃ
input_report_key(keypad->input_dev,lookup_matrix_keycode(keypad, row, col),
                new_state[col] & (1 << row));
static inline unsigned int lookup_matrix_keycode(
        struct pxa3xx_keypad *keypad, int row, int col)
{
    return keypad->matrix_keycodes[(row << 3) + col];
}
input_report_key(struct input_dev *dev, unsigned int code, int value)
devΪinput_devÉ豸,ÎÒÃǵÄ4*4¼üÅÌ
codeΪ±ê×¼PC¼üÅÌÂëÖµ
valueΪ°´¼ü¶¯×÷,Ϊ1±íʾ¼üÅ̰´ÏÂ,Ϊ0±íʾ°´¼ü̧Æð
static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
{
    input_event(dev, EV_KEY, code, !!value);
}
void inp


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