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求大神给下面的程序做注解,请稍详细些,谢谢。
7 E N Q. U! ?3 r8 J#include <linux/init.h>, p' [# H b' T/ @$ y3 O
#include <linux/module.h>
3 x2 p( T! ^- {- }#include <linux/kernel.h>' n' x0 r, }& @) [1 C1 n6 J
#include <linux/types.h>
7 U/ b! o$ B h( S; R#include <linux/gpio.h>
! N! D; _( Y! T9 u#include <linux/leds.h>
) ]6 n: j; W$ G) F9 e1 |# f! p5 b#include <linux/platform_device.h>
' Z& D$ O D6 Y2 z
- T% y0 [. a( `#include <asm/mach-types.h>
# [4 y. p+ A) X2 x+ s& T#include <asm/mach/arch.h>
w6 B0 s0 o' g" G. Q$ c* G#include <mach/da8xx.h>
6 Q$ s" e1 X e$ o. ^#include <mach/mux.h>8 b! X5 K# N* b
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)0 A A) y4 o/ _: f+ X- v
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
2 U- c% S$ Q+ D#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
) I0 X9 l0 Q1 P: m: m* u#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)3 i" I; j( `9 @- s: ]
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/* assign the tl som board LED-GPIOs*/
% L$ c1 r) c; G. u4 I$ a8 Estatic const short da850_evm_tl_user_led_pins[] = {
6 h; e- }( f J# A8 A. }0 Z /* These pins are definition at <mach/mux.h> file */4 I! Z" X" V( S
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
, T! A' R" Z: Y2 u4 ?0 q -1
, S" h) @2 a/ p. Y8 E/ a* A};. k/ W3 J7 o2 }
5 |! t5 v, B* v! ?) J% Estatic struct gpio_led da850_evm_tl_leds[] = {
5 H1 C: J. }7 \/ i8 ?/ \ {6 N4 u, s" J0 r. U" E0 I+ Z
.active_low = 0,$ x/ z3 G$ I8 z9 n |/ c
.gpio = DA850_USER_LED0,( m) C! b) ^, D5 u7 k# C" |
.name = "user_led0",8 e6 g0 \/ M* q; n% ~6 ~
.default_trigger = "default-on",7 t# b# }0 ?+ y! L' Z
},
; M3 `3 m0 K3 R0 [ {
! }4 j' }4 E4 r9 r; x .active_low = 0,# }, D0 Z5 J, v# V; ~2 s
.gpio = DA850_USER_LED1,% |) Y4 D0 c2 x) y) ?9 V
.name = "user_led1",$ U" F, B+ n0 d+ \: ~; Q0 [+ n
.default_trigger = "default-on",/ l3 I" n& W( F$ P" _( l" q- H1 m
},( D1 J' N5 m8 R* E$ K7 M6 m: e* a
{
$ c( p% T' Q% T% a# D .active_low = 0,7 J4 X/ W M. A5 b3 o
.gpio = DA850_USER_LED2,& V& F- s: L+ [; c
.name = "user_led2",
% _$ Z1 M' p" s1 a& [) T( B .default_trigger = "default-on",
+ B2 |5 t0 s) N6 V L5 D },4 n* ^ B# k8 A* W* a. @
{# z0 |: A" e! ]6 Z1 W1 l! r. ?
.active_low = 0,
1 B1 J* P2 `. t0 E .gpio = DA850_USER_LED3,
, Q3 i+ p6 Y$ q' d- x .name = "user_led3",$ N$ F9 y# B& c* F" M. J
.default_trigger = "default-on",3 K& Y m) w# t' d3 r, X4 h
},# P, u$ n+ i( s: n
};0 p3 Q* H! {- Y' M9 Q
# R6 A+ }1 j3 ?static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
7 X k: H# y2 y& U* w .leds = da850_evm_tl_leds,( t' a' _6 C2 [! j( Q. W$ a
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),7 [2 z5 k8 E1 \) T9 f M
};
. t7 M8 \6 _' V$ i8 v$ K
2 h5 a7 Y2 n3 x- E# T/ N7 e! fstatic void led_dev_release(struct device *dev)& g/ n; _0 N) y* T' {# c/ [' c
{
8 K3 U' p2 M4 q3 r" k, o. h6 K( r};
1 [1 _4 w' ?- E0 \ N2 g3 B+ N$ S* Q: G2 r& a9 l$ s
static struct platform_device da850_evm_tl_leds_device = {/ n% s& M* u, J7 a6 A$ F: }
.name = "leds-gpio",1 N" _& |) v$ ]* U
.id = 1,
6 T$ i. g% F$ A/ _9 U .dev = {
4 m4 ]( z# f1 `) D3 J: j9 ^ .platform_data = &da850_evm_tl_leds_pdata,' M2 v. q- @+ a; {8 Z+ a
.release = led_dev_release,: E& H; O2 u9 T+ K* I( G
}; y8 x! [4 U' {* o, L
};2 T( G5 o) b4 d
$ {6 c' t/ r# Y$ Xstatic int __init led_platform_init(void)
& H1 M$ j! _1 W; ~- A$ A) X2 x{
9 }" m. x+ G& u% e int ret;
9 Q5 l2 R( o2 }0 G: P# `#if 0. \- D. l! r7 W9 d
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);( m6 z2 B$ {& O% V
if (ret)( e9 }/ _' x$ N, X: H0 E; n8 d/ `
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
3 [) X# j* P. Y1 r# J' L "%d\n", ret);
% K: |2 ]2 A ]#endif/ T9 m5 F# K3 N- O
ret = platform_device_register(&da850_evm_tl_leds_device);
! H! h6 k' y" x if (ret)9 r4 I9 J( l4 @; j$ z. V
pr_warning("Could not register som GPIO expander LEDS");# x1 Q, U2 L/ k R2 J
else
6 r2 B7 `. [7 f1 s printk(KERN_INFO "LED register sucessful!\n");" l1 x1 G+ b2 `0 ]0 K
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return ret;
7 A W* @8 Z, I4 N9 W" v: b1 W V}
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static void __exit led_platform_exit(void)
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platform_device_unregister(&da850_evm_tl_leds_device);$ I, u$ {0 T5 l
5 t% m$ ^0 s; W
printk(KERN_INFO "LED unregister!\n");3 o" e, e8 d1 z
}& G1 m: c4 |1 K% E% N7 w2 i- X; d
- A1 ]2 Z; e6 W7 J; amodule_init(led_platform_init);% G/ H& t$ V' _ |1 X" H
module_exit(led_platform_exit);
' Q: E0 D) v' d% r/ ?7 y. y) M4 \* d
MODULE_DESCRIPTION("Led platform driver");
" X7 n% A6 v+ B" s. A* m2 _3 iMODULE_AUTHOR("Tronlong");0 H! J$ B; x/ U9 K" x% v
MODULE_LICENSE("GPL");. [8 C3 U6 i% q" h E
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