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求大神给下面的程序做注解,请稍详细些,谢谢。$ }( | v; V% W. `3 s2 L3 T+ g; U
#include <linux/init.h>
# l$ b! s5 r+ G- k#include <linux/module.h>
% V# F) }* a# G" s#include <linux/kernel.h>7 `6 L1 x: }/ {
#include <linux/types.h>8 ~! N! s3 k2 E# [ _
#include <linux/gpio.h>
+ H6 t0 k; ]$ `0 E#include <linux/leds.h>
; z+ p: x" w! G#include <linux/platform_device.h>" K' H; V! i# T, G
" F! U( K2 t, ]" c
#include <asm/mach-types.h> {8 G: g' {: u% S, @) X) g) L% C: h
#include <asm/mach/arch.h>
" w. J9 O" l( K+ i2 P9 _#include <mach/da8xx.h>* U% d" R g; ^& H: @$ q
#include <mach/mux.h>/ I z: x* H( v9 A5 c
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)) F0 J2 W9 V$ n; y3 o! ~
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
) v! B' I* B% Y; H2 c2 o% D, p#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)8 ?% t& v% S. ^+ G0 h2 w# c
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2); b u0 z9 Q" S' g6 X( J% s
/ S: P( o: I s/ ^& f/* assign the tl som board LED-GPIOs*/
9 s5 f: L6 l4 C$ w' Lstatic const short da850_evm_tl_user_led_pins[] = {( Q% m3 C$ e/ y0 `- k
/* These pins are definition at <mach/mux.h> file */+ w. u. C" l+ O: {2 F
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
4 d9 \1 @5 }* l9 k -1+ ?% u/ U+ w( g; _& Q+ n
};: Y# \ {' Q+ P+ u" U
* P ~+ w9 u+ \ ?- r$ P/ m f _static struct gpio_led da850_evm_tl_leds[] = { k. s+ J2 ~6 F: Q8 F; v) v* S
{8 u% U! ]0 V9 T1 O
.active_low = 0,# E9 l6 Q- D& m* H5 N& H' u
.gpio = DA850_USER_LED0,
. X. d$ d/ X+ T+ `5 T5 [1 T .name = "user_led0",! i. [. Y2 J% O7 L2 ]5 w* a
.default_trigger = "default-on",
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{
0 ^0 f- E8 W8 }9 { .active_low = 0,
5 e: D% G- y: ?4 S& A& U) E; T .gpio = DA850_USER_LED1,) r5 q) t0 [8 D( W$ [4 g, ], P: |
.name = "user_led1",
3 b+ [7 I" j9 W k% k( p$ [4 N .default_trigger = "default-on",
9 h+ e4 H1 a. F- S5 g },
& i/ U$ l5 O0 z- ^. N {0 s W) A1 F: t; z
.active_low = 0,; {- J; L0 r3 o' m s" h
.gpio = DA850_USER_LED2,
% D2 g# {7 }1 A$ n8 t .name = "user_led2",
; e* I% J6 K: I' u2 O# B$ e A .default_trigger = "default-on",! j5 }: X4 ?7 X& v, C: v4 U9 F- C
}, B* g; L( A7 j( J2 S& P+ C! y4 i
{% d, f3 a9 ~( q- c- h x$ @# Y }
.active_low = 0,
1 D) H# j( i4 d .gpio = DA850_USER_LED3,8 X& P) T- h5 i! E3 x
.name = "user_led3",
e) H$ a, i# l- R* F .default_trigger = "default-on",
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};
) v! |( c4 }; }: @
) T8 a! j, L% x# x& H) `3 h3 s; [static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
- _. I1 E: J; u; `2 i& `" u$ j ^ .leds = da850_evm_tl_leds,8 _7 v2 I8 J$ r# V" f( \3 C
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
4 \% E% D$ Y7 e; m};
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static void led_dev_release(struct device *dev)5 b" d4 u' b; v# K+ j* z, c2 r( A! O
{
: G0 F" A5 I2 N};. {; |/ V4 E) ]: F! V: g T
9 s U9 ]% \% H* z" Q! h
static struct platform_device da850_evm_tl_leds_device = {9 } ~$ J5 y( J1 Q7 g9 m
.name = "leds-gpio",1 ^! j1 v" y+ e0 X0 m* g
.id = 1,1 P5 g# ^8 h' J
.dev = {
2 |) H7 c. E6 ?1 C. I' d0 s# K .platform_data = &da850_evm_tl_leds_pdata,
( I) Z5 x1 s5 l0 ?5 j" r: h7 W* r .release = led_dev_release," y( f! c- o" K& l$ G
}, m9 Z1 R% _, u
};% u3 o1 B9 _; I+ F6 v
+ |8 }+ A2 R) G4 C* e vstatic int __init led_platform_init(void)& ]/ C8 t/ [! k) _; r( R
{
, `( l3 B7 c: r0 Q5 Z( [9 k( U int ret;1 e0 ?- z2 N; E% A0 m3 h
#if 0& m# l8 K1 m! m% }- X' b; ?
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
: T/ Z, R: v4 b9 {$ m4 H if (ret)
& Q& n) W& b! ^) E4 v pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
T, e/ O7 K- J; x "%d\n", ret);
+ O+ z9 B+ `. p. U#endif! Q0 D8 V5 J2 K3 N
ret = platform_device_register(&da850_evm_tl_leds_device);9 ]8 d0 P$ o' E% U
if (ret)( \# G" V! Q2 ]
pr_warning("Could not register som GPIO expander LEDS");
+ D6 G6 w. k: P else$ K! A- `. Y! ^2 `
printk(KERN_INFO "LED register sucessful!\n");, q0 x; O+ a1 h: q1 n' u1 c
* m: n& O R) n* b z3 W return ret;$ |( D" [9 V, R+ z
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static void __exit led_platform_exit(void)1 P T8 O. |! t9 `6 G
{
6 A8 t+ a8 ~2 U& P) \$ Y platform_device_unregister(&da850_evm_tl_leds_device);
% [2 d+ }; F7 e! a% j6 l4 t& i) |. G& L
printk(KERN_INFO "LED unregister!\n");: `% L6 ]4 S! w' F/ m
}
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3 T4 g5 W& C4 j7 pmodule_init(led_platform_init);
. l6 ~& C; A/ G" Lmodule_exit(led_platform_exit);
5 @+ I! [' [4 n* J9 H! ~2 C/ Q
. q V7 \ W: `- H! KMODULE_DESCRIPTION("Led platform driver");" y4 C9 ~# n$ U' F, h
MODULE_AUTHOR("Tronlong");
2 j2 m: N( L5 W4 uMODULE_LICENSE("GPL");
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