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http://blog.chinaunix.net/u1/38994/showart_1130025.html
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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
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