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求大神给下面的程序做注解,请稍详细些,谢谢。6 V0 }' V/ `( N1 T! x
#include <linux/init.h>) g) P$ v. T" H: J& b
#include <linux/module.h>
3 P' e- c4 L9 P+ T- ^% _2 f# V6 C#include <linux/kernel.h>
8 q, E* M5 D) d0 s ?3 g8 t#include <linux/types.h>
3 f# g) M p" h# Q' g. i+ _3 v#include <linux/gpio.h>+ O; d, x* q9 f
#include <linux/leds.h>
9 Q0 H; X- t+ \4 d#include <linux/platform_device.h>
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#include <asm/mach-types.h>
: k% f# P K/ |# G: ^0 V5 p#include <asm/mach/arch.h>
& e/ L7 P5 Q1 R/ \/ X8 w0 t#include <mach/da8xx.h>* u8 |& o6 b i# H. l
#include <mach/mux.h>
* I, V, ~* O# d$ s$ v/ q! C& O ~* f
#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
( d" o" u& d2 ^; ^ d* f#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
1 |, Q' y* F' K" ?) n( s#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
! \6 M- ]8 r L$ u2 H+ \#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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/* assign the tl som board LED-GPIOs*/0 v% A/ Y0 M, o' y' M6 B; X) u6 A
static const short da850_evm_tl_user_led_pins[] = {. F9 ?% t# p) C, v, y3 Y: n
/* These pins are definition at <mach/mux.h> file */
: d, w4 y7 f' @- n DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
8 R% |- {' Z6 s -1
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static struct gpio_led da850_evm_tl_leds[] = {; _7 n5 t2 s2 l$ {9 e
{% R: n4 Y8 c) m& u3 q
.active_low = 0,
3 D2 m, M$ X5 |! Q .gpio = DA850_USER_LED0,! g$ l! }0 Z/ ]
.name = "user_led0",3 y- o4 e/ [. a `
.default_trigger = "default-on",
8 {. m$ D' y7 r },
- a7 e5 }% Z/ b" K1 \2 L/ i {
- H# \! N5 e4 Y .active_low = 0,
& Q7 U4 F1 Y2 Y/ G( D .gpio = DA850_USER_LED1,
* J( d, U t1 P9 } .name = "user_led1",
" f& c' l& s; A$ }$ U, e .default_trigger = "default-on",% W& I% M, q5 U: @* P v/ ?
},; H) A1 n# t7 ^: ^
{
% s/ o) X& J, I6 V$ R .active_low = 0,
- \1 w& [" t, C/ o8 \* T9 m .gpio = DA850_USER_LED2,- b0 m L" y! Q% m( g
.name = "user_led2",3 P* A2 s7 `9 a: D
.default_trigger = "default-on",
* v# I" V: |, ^, n! G2 A% ` },
9 R6 ~2 p( _) i4 Y {
x4 @$ U! g8 ^3 e0 e* r( k .active_low = 0,; o4 [0 x6 V# {3 l
.gpio = DA850_USER_LED3,
Z2 }9 ? M5 d1 a .name = "user_led3",
" W5 {% @ P8 H/ T. R .default_trigger = "default-on",$ T; J3 F/ I2 x4 r9 b H' L9 i
},+ W z" g- z6 I3 t
};! j' r) I: R$ B
6 \- h- h& d" m& E0 Q3 f ?static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
% A, [9 R9 K5 R K .leds = da850_evm_tl_leds,6 M2 p0 ?. I P+ q! c2 K: Y1 p
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
7 O' I. ~+ N' m0 I1 {% j% y/ x};
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static void led_dev_release(struct device *dev)
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};. B* w" O4 K, ^% v% a# g; U
! a, L9 Q* A. F9 G' K- W0 r
static struct platform_device da850_evm_tl_leds_device = {
4 P+ a2 U- H- X+ k! D; f .name = "leds-gpio",( D5 D$ U; O# _3 `; k. D2 f7 l
.id = 1,
" m2 [' G N0 e3 x4 s .dev = {
' M5 F) p" S$ N6 H .platform_data = &da850_evm_tl_leds_pdata,( c6 n' `) k ]9 E C; S
.release = led_dev_release,
# \1 g) c" C6 K1 j) X$ k/ n }6 A' a& M" q" N2 A& z$ W: B
};
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static int __init led_platform_init(void)
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int ret;
( a5 y- N; ?8 ]$ P/ x' E( H, w$ }8 [+ z#if 0
7 u) w# h) ?$ u6 g8 O ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
6 r* H: t1 _7 R; R0 q if (ret)
. S( }* h! b% i pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
' f6 E' H7 t8 Z4 \, x: f "%d\n", ret);) x0 D- J: \0 v8 q$ |* _8 v v' b
#endif* f7 f4 a# q4 n! e( {( e
ret = platform_device_register(&da850_evm_tl_leds_device);
+ I8 U) a4 J$ e3 f& U" X! P if (ret)+ }' `) e5 B& {
pr_warning("Could not register som GPIO expander LEDS");2 X1 Z! S+ C" X4 ~) t
else2 g5 G1 H! ~: x4 \7 v& X) a
printk(KERN_INFO "LED register sucessful!\n");
# C1 y) q0 Q7 e) j* `8 p$ E
1 f K% n7 [' ?' V return ret;8 l8 H) y: J: v
}
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. X. X1 M7 y: a3 J1 K& Rstatic void __exit led_platform_exit(void)
! {9 s7 P: L7 w, ~* y+ Y! M, G{
& U" _6 w& }6 |4 @ F, v platform_device_unregister(&da850_evm_tl_leds_device);
2 d: V2 @# K8 N) k3 x" l8 u9 Y; ?
printk(KERN_INFO "LED unregister!\n");0 Y% P3 `4 I* L1 p2 W! z
}' g! b( v5 e5 Q
3 M3 i8 U9 n2 E8 h) [module_init(led_platform_init);
! A( K. w( K3 _+ G0 ymodule_exit(led_platform_exit);8 _: [7 u' K8 E. Y7 Q5 q( z
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MODULE_DESCRIPTION("Led platform driver");/ d; D+ |" s0 y1 O& t/ W
MODULE_AUTHOR("Tronlong"); ]* V5 A- K6 G/ _. c, c( l$ Y
MODULE_LICENSE("GPL");
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