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求大神给下面的程序做注解,请稍详细些,谢谢。3 h0 T$ L7 w+ `: g* N
#include <linux/init.h>% ?3 {$ V' n7 ^
#include <linux/module.h>. n$ q/ W1 N% S1 n- n/ x. U+ @
#include <linux/kernel.h>3 [+ @' L& ]# \2 Y- j& P# ^* i
#include <linux/types.h>
x4 _/ h' E( z0 Z: Z#include <linux/gpio.h>
# T9 E0 }; h; T: L#include <linux/leds.h>. {/ c* Q# ]5 w% K+ W. f, q7 m3 P9 Y
#include <linux/platform_device.h>" M4 z, V5 n. T: o
7 @2 I& i; x1 j; s2 a* R% N#include <asm/mach-types.h>
7 c/ q' T; D' |+ C#include <asm/mach/arch.h>8 n* |) ^2 O a
#include <mach/da8xx.h>) V1 P: n& |) [9 \
#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
" g% w. P0 X1 e& ~ }5 {" ^% G/ h$ A#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
- T7 f, A2 I2 a$ [1 ~8 E+ f0 W* H( k#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)1 m8 H3 S5 o' h
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)* q6 b) ^8 J% x. G5 X
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/* assign the tl som board LED-GPIOs*/
- y) E' A V6 V# [static const short da850_evm_tl_user_led_pins[] = {
' e) D6 z7 I! |5 I /* These pins are definition at <mach/mux.h> file */
4 Q2 t" z9 J+ I4 k DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
, m) y/ R. h& Y3 N# V) n -1: D, s8 K# Z1 k6 ?
};
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static struct gpio_led da850_evm_tl_leds[] = {
; \8 b! f9 [- O* ~( _ {0 d7 N) u6 T. r$ _: A: C% D4 E! B% b
.active_low = 0,
, ^9 W) d$ E& C- P; Y .gpio = DA850_USER_LED0,6 u: y# F4 M6 D3 r5 u
.name = "user_led0",' M' ~ \1 q2 _! A5 |
.default_trigger = "default-on",
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{
+ w: y- I5 e1 h% d6 I .active_low = 0,
; m/ t9 m" u- h" u- n .gpio = DA850_USER_LED1,
# l G* r# K$ h' k9 u: @+ p* @! O .name = "user_led1",
: e: r* v0 |- F( m: o6 s .default_trigger = "default-on",
/ R2 \+ l/ D, M: O0 f$ |# j. t },
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.active_low = 0, O9 N; W3 h* C l: e; [
.gpio = DA850_USER_LED2,1 [; _) J9 P0 j; F) J& R! J6 U( {2 X
.name = "user_led2",
. I9 W; X$ J8 N .default_trigger = "default-on",
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{4 X V* p8 T+ ]8 k+ ^
.active_low = 0,
' ]3 Y( R, J$ E3 t1 T' E .gpio = DA850_USER_LED3,. ~! k! d6 X k
.name = "user_led3",
# r+ V. B+ s2 E4 M6 x) v .default_trigger = "default-on",( I* w, {+ e- K+ m W+ y1 m [
},; g% I' ?' z7 S5 Z3 `5 A3 z
};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
4 F( {" E4 u! ~ ]7 x7 q) N .leds = da850_evm_tl_leds,
+ x' u) n$ \2 F4 R( J. Q .num_leds = ARRAY_SIZE(da850_evm_tl_leds),7 }9 W+ m$ {+ W( ?) `; Y2 F$ A5 C
};/ B6 X: ~0 C) a5 C
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static void led_dev_release(struct device *dev): j" v( m# f; ^5 c9 v" x
{
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- h5 e, J+ e$ O; rstatic struct platform_device da850_evm_tl_leds_device = {; E9 G* F7 z o: O$ I
.name = "leds-gpio",
- u* Z( ]: h* J) @ .id = 1,
8 f" c4 B" n; A( n .dev = {
% v% H2 U* D0 |9 {. _ .platform_data = &da850_evm_tl_leds_pdata,
- f# a+ v' F2 Z- T9 e7 x: I .release = led_dev_release,5 q/ ]- y9 ^, j
}
! C3 q; y3 J0 X8 N};
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- S Y5 Q& u$ ^9 p1 K5 B3 Istatic int __init led_platform_init(void)7 {" n/ C. U& n' G
{
. R# s) _& ^, M int ret;
# ?: I2 @- a) g+ Z# v#if 0( P# o6 S4 j0 t9 T7 K# m3 `
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
7 h3 c, C u# V9 ~* b if (ret)
% S1 |) |% C4 s- o/ g( o0 ? pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
/ ?! i+ c3 N8 K2 j- y! a "%d\n", ret);" S* o. g# p) W' P- Z; r" A# Z( A
#endif `) f" S) q( L$ X2 C F9 O* o
ret = platform_device_register(&da850_evm_tl_leds_device);
* ^1 Z: w& [. P, A5 `* l if (ret)2 b+ a2 m' O$ F9 H1 }0 m
pr_warning("Could not register som GPIO expander LEDS");
" [: i8 M$ t z. f0 j- b else7 }; Z& X3 M! P/ @1 H: C- D. a
printk(KERN_INFO "LED register sucessful!\n");! ~% i; `( r9 C* s
" v6 Z6 A' m4 G2 n return ret;. j* L8 P: T% V% m4 Y
}
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static void __exit led_platform_exit(void)
. X1 P# {3 @; ]! b{- r% [0 c& G% ?) X
platform_device_unregister(&da850_evm_tl_leds_device);+ P5 p6 d, z+ ^' E( i$ B1 i
4 R4 z6 b( R2 T4 o6 | printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init); \7 G x. T* S
module_exit(led_platform_exit); b6 Z0 R( j2 y: I
5 U, s6 x" j$ m2 ~- G3 PMODULE_DESCRIPTION("Led platform driver");
3 Z9 L3 O" n% l6 e" n& I. r, k1 Q* VMODULE_AUTHOR("Tronlong");8 P$ w' ?) ^/ J* H( x' a
MODULE_LICENSE("GPL");4 y0 h# Z1 Y8 Q$ M
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