程序注解

rgf

求大神给下面的程序做注解，请稍详细些，谢谢。
9 V/ a2 Q5 r4 e/ a: S#include <linux/init.h>
#include <linux/module.h>
4 e' ^; ?6 e+ U/ e4 I' C' b#include <linux/kernel.h>
; m$ ]2 {; F. q) X1 @#include <linux/types.h>
5 ?) X- D: _3 a# e$ R7 h#include <linux/gpio.h>
  B: k& N1 [& `5 P' {. |( h, g#include <linux/leds.h>
#include <linux/platform_device.h>
4 c* _" l5 Q, v' ^5 p
; w* M# p+ {; g& e- i# _" i#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <mach/da8xx.h>
#include <mach/mux.h>
4 i7 {: u7 p1 t0 k- G
#define DA850_USER_LED0        GPIO_TO_PIN(0, 0)
* G$ |! c+ u, k  E2 k" O8 l7 M#define DA850_USER_LED1        GPIO_TO_PIN(0, 5)
#define DA850_USER_LED2        GPIO_TO_PIN(0, 1)
  y3 _: M8 i2 P7 X#define DA850_USER_LED3        GPIO_TO_PIN(0, 2)

: r% G) b+ q+ t6 U; b7 d/* assign the tl som board LED-GPIOs*/
9 W$ y2 d: |9 {  U) rstatic const short da850_evm_tl_user_led_pins[] = {
" ^+ O- {+ [4 L& _5 H& h2 I+ _        /* These pins are definition at <mach/mux.h> file */
        DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
( }: Y' p$ ~/ @- C        -1
3 z( R) _# H- _- |* n8 s" G};

, G5 M! j* D- U! Astatic struct gpio_led da850_evm_tl_leds[] = {
        {
                .active_low = 0,
                .gpio = DA850_USER_LED0,
                .name = "user_led0",
6 Y. }( c( }, p: n                .default_trigger = "default-on",
        },
        {
                .active_low = 0,
                .gpio = DA850_USER_LED1,
; A3 f$ U; u) p4 N, p5 ]3 p" H                .name = "user_led1",
                .default_trigger = "default-on",
- V/ Q) h7 }  T  i# i        },
        {
                .active_low = 0,
3 H( I: n" t7 t) v+ d8 h& s: L5 X                .gpio = DA850_USER_LED2,
                .name = "user_led2",
                .default_trigger = "default-on",
) Z- F, J% }! N5 K( j        },
        {
" j- z& w0 N, T                .active_low = 0,
( A- m: K5 R- J8 y" v; x                .gpio = DA850_USER_LED3,
7 T( V4 q) U5 v0 H9 H9 |                .name = "user_led3",
- X: u$ @5 X# h& x3 O( l                .default_trigger = "default-on",
* |9 L% P  _+ A1 e% m3 S        },
* [' y( Z4 S4 R8 k$ n};
/ w8 g/ @: [  F5 c+ b2 h7 ~
5 k. D# ~( B8 [: N7 cstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
( p4 N& @* E+ h& b' `4 Q, Z( O! R        .leds = da850_evm_tl_leds,
        .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
: B" q* F  Z7 S/ p, @};
* H0 ^1 `' t8 P. z
static void led_dev_release(struct device *dev)
{
+ Y8 g# E7 v; E7 s% a};

static struct platform_device da850_evm_tl_leds_device = {
        .name                = "leds-gpio",
3 Z& C& y& s! F, b: t0 x2 {9 r        .id                = 1,
% h5 e& Y( n. m7 i% \8 r        .dev = {
# v0 U( U: K7 p$ g" r# G# x9 b: _                .platform_data = &da850_evm_tl_leds_pdata,
( O9 d) X: e6 O* H" t                .release = led_dev_release,
        }
};

static int __init led_platform_init(void)
{
  e% F. v7 @  i: T' [        int ret;
* e" r0 u) q" Y#if 0
        ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
        if (ret)
+ l$ N4 j+ t8 D6 d0 p+ X: p# Q                pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
                                "%d\n", ret);
#endif
' o  S) `/ k6 y  `; [. l8 s$ }        ret = platform_device_register(&da850_evm_tl_leds_device);
        if (ret)
                pr_warning("Could not register som GPIO expander LEDS");
        else
                printk(KERN_INFO "LED register sucessful!\n");

        return ret;
4 d% f4 R/ `) L, q}

static void __exit led_platform_exit(void)
{
; [! K3 E) t9 O9 a2 }7 ^7 G        platform_device_unregister(&da850_evm_tl_leds_device);
( Y1 P; q+ J5 K' L+ e$ `
, g; g% {8 h& H* K$ O        printk(KERN_INFO "LED unregister!\n");
: G) }: b/ k! }7 p& n, C/ a6 `+ i}
- _1 F6 t& |8 g$ J6 L; W
module_init(led_platform_init);
module_exit(led_platform_exit);

MODULE_DESCRIPTION("Led platform driver");
, j5 o' y* a; r! I& H" m: n: NMODULE_AUTHOR("Tronlong");
MODULE_LICENSE("GPL");