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求大神给下面的程序做注解,请稍详细些,谢谢。" y9 W' ^6 f/ V* G3 U1 V0 s* B5 I
#include <linux/init.h>
, w- c. }) B W9 B& X#include <linux/module.h>
1 a; M) B* x3 p9 o% m/ v L5 N#include <linux/kernel.h>
' L' E9 o+ L5 \#include <linux/types.h>- [+ }/ M3 l: q. e% t
#include <linux/gpio.h>
1 e4 R7 l; v! v#include <linux/leds.h>8 ?9 p" x& ^- }# {
#include <linux/platform_device.h>
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% |( p( {6 E4 _( a/ H+ b* x, p+ P#include <asm/mach-types.h>
( }' [* `( }' h9 l+ X* ~3 h6 J7 @#include <asm/mach/arch.h>
" W6 k5 D$ t: Q& Q% M#include <mach/da8xx.h>
& D6 u0 S/ N) f& a7 U- Y9 O5 j( |' m#include <mach/mux.h> ? d- j% V* t+ j# ^. I$ R; d
. w' E- s/ l& x#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
. S( F4 O5 N: [+ V' p#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
* Z5 C5 H! H# W) q1 V- c#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
5 Z4 a0 J& d7 r. o2 f0 G#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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& g% Z/ M9 t, x6 e4 i$ E' Z/* assign the tl som board LED-GPIOs*/
1 q/ h+ R: m! R# Y# @3 Q) I: Qstatic const short da850_evm_tl_user_led_pins[] = {
) f5 |3 S) T1 K /* These pins are definition at <mach/mux.h> file */
' ]/ l3 G# X9 h& D DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
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};
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static struct gpio_led da850_evm_tl_leds[] = {
; Z; z# R( X/ _7 u4 J. k$ q7 ]3 b {
, M$ x6 b, ^5 m5 ^9 @0 a& S .active_low = 0,* X- J% e% J; ]2 e; l' ?7 ]
.gpio = DA850_USER_LED0,
8 n2 {* `% J! R4 G9 w# k .name = "user_led0",
. n6 n9 b% ]) ]: H0 w9 Z* Y .default_trigger = "default-on",9 k) n& ^1 P$ \' ^& }* [ K) C }' G
},' U3 _. O! ?8 o) G9 @% X
{
' @( s" s, P' q2 Y* C& | .active_low = 0,- O9 c; w9 O' p- \7 y, N3 E
.gpio = DA850_USER_LED1,8 {$ p# \" O6 w4 k' ^
.name = "user_led1",; Z* j- P* p8 Y' K Z. [
.default_trigger = "default-on",! _2 k' | }2 L5 G
},; f2 v1 E* U% Y7 Y7 ]& j8 r/ i% D
{
* f% d s7 Q* b; ^, N7 L .active_low = 0,
+ M1 w+ f: [2 u0 C* y, b .gpio = DA850_USER_LED2,
8 s+ D/ t1 z/ C .name = "user_led2",
$ [' p) `3 d' R .default_trigger = "default-on",
. a% G! R% w# | },
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.active_low = 0,* h1 _; @/ U5 Z/ V& ]# z+ n" N
.gpio = DA850_USER_LED3,
' D9 K9 z. w1 T8 x .name = "user_led3",
/ ~! d3 n z) G .default_trigger = "default-on",
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};% J% V" Y: U1 A# N% B& s
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {0 N$ b% p# h+ V0 k+ T
.leds = da850_evm_tl_leds,$ A+ R. i& _9 {
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
6 E4 u7 ? s/ ?$ F6 n+ R};
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static void led_dev_release(struct device *dev)0 t0 f7 d' X7 K( ]% b
{4 g& _7 c2 l* l/ }) K
};6 h2 l, y1 a, I/ \ E' F: G
& { s6 L2 j; P m0 Sstatic struct platform_device da850_evm_tl_leds_device = {- o" c: W! @3 K2 o
.name = "leds-gpio",0 W" f9 R0 I/ D; ?
.id = 1,( O( ]. J% L' r: K; r3 U/ [
.dev = {
/ k3 \. o+ y" T .platform_data = &da850_evm_tl_leds_pdata,/ N: ` i" P9 \- |4 }- l
.release = led_dev_release,
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};
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static int __init led_platform_init(void)) V' q) ~" E3 T$ C) I9 m5 t
{
2 q: H* x5 `# m' Y4 i1 P4 [4 u int ret;1 z; p( l7 u/ B7 |, v
#if 0) e U& a# \8 |- K
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
( G, n2 Y8 l8 {, m if (ret)' \+ ^0 V7 H" l& b
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
; m0 a) k$ i6 c! {/ S, w1 f4 R "%d\n", ret);, R5 O* Y( r- x7 ?
#endif' }7 j& `) b" F) d! \3 P9 H
ret = platform_device_register(&da850_evm_tl_leds_device);
/ X1 s- R# y% }8 B' z: \ if (ret)
2 u" @& P+ H5 C; s8 c pr_warning("Could not register som GPIO expander LEDS");# e9 C. B: f) r2 E
else2 n' X( L8 S6 B
printk(KERN_INFO "LED register sucessful!\n");
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return ret;, K) c) Y, O6 b8 S2 |
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static void __exit led_platform_exit(void)1 R: \! H1 ^9 p- ^2 f3 y5 o
{
; h$ C6 G x V# X3 |! I5 Q0 X platform_device_unregister(&da850_evm_tl_leds_device);1 L1 ?8 K. c& j) c1 s9 m8 P. {; H
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printk(KERN_INFO "LED unregister!\n");$ O \) v- P$ Y4 c
}
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2 M4 L; h2 `; I) |: l! y" Kmodule_init(led_platform_init);
! f- k7 h ?$ O7 L' Imodule_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");
0 e9 J8 @, [5 F7 h$ N# {. {$ @6 dMODULE_AUTHOR("Tronlong");7 I% q7 K! k% Z7 d5 r3 k# e
MODULE_LICENSE("GPL");
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