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求大神给下面的程序做注解,请稍详细些,谢谢。
) o- L0 K6 K0 Y7 ^8 n6 y#include <linux/init.h>' m" ]& J/ W& A4 M2 |
#include <linux/module.h>
9 k) Z2 j3 w; {" r' d#include <linux/kernel.h>5 i& T8 U( u6 q
#include <linux/types.h>5 p2 f( {% f# H$ Q# P9 i2 u
#include <linux/gpio.h>
3 A9 {, [! @' C d% i#include <linux/leds.h># B+ m- n. h* G
#include <linux/platform_device.h>% E/ f+ N; G+ Y
, H$ w4 j9 j0 b$ z7 M" ?) E#include <asm/mach-types.h>* E, M7 Q" p0 a9 E% c
#include <asm/mach/arch.h>
! w% }$ v, e* P9 K#include <mach/da8xx.h>: j+ h+ d( f& e
#include <mach/mux.h>& M- |. D6 H) p, P) ] m1 K
8 v Q. X+ n2 u# |2 q" Y
#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
6 u8 V( X% }( d) n0 A& d#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
2 M. |- C6 h4 N5 o1 Y#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)% m6 u; H, Z, K+ }) `' o# j6 Z5 H
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)# B7 N9 C8 _. R# [; o
& l4 ?2 F7 X7 M: G' k) z: p" v/* assign the tl som board LED-GPIOs*/
1 }3 D& d, r+ |% J7 Y" jstatic const short da850_evm_tl_user_led_pins[] = {
' w' l$ U# w7 m7 P2 N9 D- C /* These pins are definition at <mach/mux.h> file */# f' y" r) _5 [% l) f
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
5 v" [1 @3 }( T -1& @# A# q, H/ S5 }0 \- w7 V
};
7 j( r4 b7 j' K$ {4 ]6 R% S) b, I6 Q+ K2 j( W
static struct gpio_led da850_evm_tl_leds[] = {
4 w" Z. v3 {2 {0 I$ r {
5 Q( a% y! W+ F& y/ I .active_low = 0,* [/ J0 i8 U7 I- S" M: g7 |) S! ?
.gpio = DA850_USER_LED0,
0 } e' Q( o% V+ l' _ .name = "user_led0",: q8 F E" s% z7 `" @8 x/ q
.default_trigger = "default-on",8 m+ ?" N' n+ ~/ ~
},# [5 z6 e$ s j2 q2 ~$ ^, P
{
, ^3 _: \7 y: v9 p! B6 I .active_low = 0,/ a O0 J+ W# O$ W% K3 {
.gpio = DA850_USER_LED1,, F+ N' |. x& Z7 T; t
.name = "user_led1",# o' Q, y5 s) ^
.default_trigger = "default-on",
2 B- O$ E8 A4 d% ] },( g w4 v. i( `# q: O) ?9 [, Q
{
e/ [$ y! G1 s" h6 d .active_low = 0,
c, t7 f, d( |( t! Q .gpio = DA850_USER_LED2,; ?+ Q; C% a! x w6 |
.name = "user_led2",% Z2 a" H4 S7 @) A, M$ {! D7 s1 |
.default_trigger = "default-on",
3 Y7 Q8 L4 ?) {$ W },
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.active_low = 0,
6 k" [4 @: c8 f .gpio = DA850_USER_LED3,
1 _2 a' r* z8 p: O+ B ] .name = "user_led3",' j& x3 {1 y5 b1 U' {6 u2 y8 l
.default_trigger = "default-on",
6 A0 d# r: Z4 x+ w6 | },
5 B3 J) f/ ]4 f: W9 h};, g+ g E, A+ O0 W3 K/ V
3 h/ P. e1 n7 @! w5 z+ x% x
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {. t5 J B& U+ M) J% ]) i. {
.leds = da850_evm_tl_leds,
* B- q1 z' Z" v* J: @ .num_leds = ARRAY_SIZE(da850_evm_tl_leds),/ \) d) `8 v+ {
};. C7 [. v# d ~9 {! A/ v1 C: } Z
- h! |8 h/ \. F0 B; Zstatic void led_dev_release(struct device *dev)* D# ^3 l" O' v
{& ]. Z$ E Y& t; X
};& N) F) D7 M% c$ f. M4 [& c. B6 x
& u# J( B: J/ n
static struct platform_device da850_evm_tl_leds_device = {
/ h5 I5 P' S. t- S .name = "leds-gpio",6 n" l" u2 U3 l- Z& v
.id = 1,+ E& ?' I" w$ X! h/ \. E6 _
.dev = {
% `! D$ K4 j+ C* N& S .platform_data = &da850_evm_tl_leds_pdata," d9 A( o* `9 U5 p$ m- y
.release = led_dev_release,4 x! P* e4 \7 f/ o! @( e v
}
* s" _0 d7 F8 W" s _+ g};, e" k7 M) D l/ @) x
, S8 b! } V P M
static int __init led_platform_init(void)
- s! [ @- ~& P. P9 Y4 C+ {2 Q. Q/ |{
R; @& {+ x! K: I" [$ M5 Y: S; ?5 K int ret;
3 I8 ]) ~/ P; V$ s; u( C$ c#if 0
. q$ X9 \- V! D$ z ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);$ ~; q: }& h1 u4 @
if (ret)4 a& d1 O6 X4 F8 h
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
" p9 X' ?8 |# i "%d\n", ret);' N1 F8 U* i5 F: m4 C- U
#endif8 S7 i }3 N$ \$ _+ ]
ret = platform_device_register(&da850_evm_tl_leds_device);
' z/ ^. D5 F6 o* [# }# R5 y if (ret)
9 e, K# I `) u pr_warning("Could not register som GPIO expander LEDS");& F( a) y6 \! e3 h+ t4 @* W
else
, ` Z/ \. n4 b) V$ ^8 U printk(KERN_INFO "LED register sucessful!\n");
$ c% g B9 J; F
; v4 o8 o+ W6 x! B5 M! k return ret;
4 B7 z' Y( H% S e& O0 z! l}. s% s3 V( j: O$ e' S; ^
' u9 y% e* q+ ~
static void __exit led_platform_exit(void)
2 H3 @8 f- z/ Z: I6 A5 X* R{4 ]! T' d. \5 E7 F! f
platform_device_unregister(&da850_evm_tl_leds_device);& g. b f) B8 p+ t
+ x( O8 M/ H! O$ F4 x
printk(KERN_INFO "LED unregister!\n");1 e. n; k; I$ {6 [/ u- N* x4 ~( n
}
# ?3 }" O$ Y( C% K1 x0 v
0 i0 |: }; r$ k& Pmodule_init(led_platform_init);/ R7 h' y, l2 d4 Y
module_exit(led_platform_exit);) z+ w9 s s8 A" _7 ?
8 t1 B' R) n: g; v$ K1 xMODULE_DESCRIPTION("Led platform driver");% Y5 U, k% Y1 f6 ^: W0 f t
MODULE_AUTHOR("Tronlong");
" c0 ~4 W% P! w! x' eMODULE_LICENSE("GPL");
" Q, U) D# Y% R1 X
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