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求大神给下面的程序做注解,请稍详细些,谢谢。
, V T% y, [: e- {; h6 Q#include <linux/init.h>4 f; U% ~, S! {; n! ~
#include <linux/module.h>
* u7 T2 }& Q7 Q3 e, T' Q) f#include <linux/kernel.h>8 [: o) f+ k( y! u, A* {
#include <linux/types.h>
* c0 J; Q3 p/ ^$ S o9 r# Y8 y/ ^3 X#include <linux/gpio.h>
2 ]+ b- K$ o' ?2 K$ J$ V* t3 j#include <linux/leds.h>, p7 [3 z4 B$ A3 F8 H$ p
#include <linux/platform_device.h>
4 [( t# q3 N& g4 e0 v
( ~1 M; X% y* ^: Z/ f; k( `#include <asm/mach-types.h>4 i/ r$ d! J1 E3 @" }
#include <asm/mach/arch.h>0 p0 B& I o6 @6 [1 _
#include <mach/da8xx.h>- ?) ?1 s% I) e' j
#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
5 X- ]9 z% R+ f& Q4 G& T" x$ f1 ^0 w#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)$ c& n, x3 a- K0 h
#define DA850_USER_LED2 GPIO_TO_PIN(0, 1), N% i, G) w* M2 l6 e0 v
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)/ D" o8 o& E5 G1 v
! k4 v' R: R8 S# v/* assign the tl som board LED-GPIOs*/" J: w3 [* D# Z* t' {2 N
static const short da850_evm_tl_user_led_pins[] = {/ w3 e+ R" V. q; V, N0 j# w
/* These pins are definition at <mach/mux.h> file */" m { ^% I, I, z: S( i' N5 K/ W3 F
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
4 N% C3 `. f( \& w( Y+ ^ -10 m6 `1 ?2 a, l2 t) ^4 D% N( g5 U8 X
};
7 ]% I4 M. i+ P9 b" @, {
6 b' P/ }) L# g) t. G0 Gstatic struct gpio_led da850_evm_tl_leds[] = {1 V y* [7 f$ A/ V
{% F5 t) y% C' l7 n
.active_low = 0,4 k& F' K5 [5 T( |, @
.gpio = DA850_USER_LED0,% B" s6 L# I6 w- J6 M
.name = "user_led0",+ j0 C0 k% @2 s
.default_trigger = "default-on",0 \' x& O! m* V% {1 M/ ]( z# A
},
2 t4 u3 H i! {4 q/ Q* X7 p; g {
+ v7 Y1 w/ j& K0 L/ \% N .active_low = 0,
3 s8 w- J' \: u" R: F' w .gpio = DA850_USER_LED1,
( {# _1 e5 k3 @6 s" C .name = "user_led1",: e& V- x& B8 g
.default_trigger = "default-on",
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{
( n! R: s1 v" @- W* b, r' G .active_low = 0,; O$ L3 W5 U! {; y- w: _4 w8 c3 C
.gpio = DA850_USER_LED2,
9 e4 @0 j) u% Z, v5 N .name = "user_led2",
# H1 v1 |+ q+ O- S2 q* L8 Q .default_trigger = "default-on",
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{
+ ^* C; {6 s; v7 G4 c. e .active_low = 0,
$ a: q( R" b9 }1 H9 w) O2 M .gpio = DA850_USER_LED3,7 O8 W! C9 ]; P, m+ S
.name = "user_led3",
9 R s) `* R ~* z .default_trigger = "default-on",; t/ M1 e3 A2 A' o5 r8 v2 Q
},
5 M# h3 w! J, ?2 \" \, w};
; P* u: h$ O& o) j3 @
* a8 f7 D. K$ D% M! }6 K9 r) Ostatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
/ d3 j! j/ F% T3 {+ a .leds = da850_evm_tl_leds,: X2 n3 x. _: j4 u
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),/ l$ x! I3 c& U- y& Y0 c1 Q) V5 |
};$ f7 P! X6 @$ ^2 }+ z
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static void led_dev_release(struct device *dev)
# }$ M. w5 @( ^1 K: w+ f{
3 M/ j8 \. B: s+ |1 E* z& @' [};
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static struct platform_device da850_evm_tl_leds_device = {
9 W( ^' ?0 A. s8 [* L .name = "leds-gpio",5 P8 ^2 b! j' E/ b9 O: Z! s
.id = 1,
/ ^7 j! Z& Y! u .dev = {4 a& U, C& D9 b7 {2 {8 q! C
.platform_data = &da850_evm_tl_leds_pdata,
. z7 ~2 ?/ ~& V4 q .release = led_dev_release,
. d+ x2 m A( s/ K }
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# N- z+ U4 \7 ]static int __init led_platform_init(void)5 N' j# H l" D: ?
{" {+ W& R3 P. G$ ^* \% r4 ?
int ret;
e4 n$ w" P o. T! s8 u6 }$ u#if 0
- ` q6 c: ?3 o+ o ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
! k0 F: _2 o' n4 k if (ret)& C% ?4 m1 r1 `( _9 B5 u/ ^$ n
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
6 b) W+ @8 l! [* S0 A8 u "%d\n", ret);8 \" E0 G* A% [0 d h
#endif) g- @0 @8 V3 k: `6 G) G( O6 X
ret = platform_device_register(&da850_evm_tl_leds_device);
/ o6 \8 D) M2 t, A | if (ret)! h) b- d6 `* _& r& G8 M" ]
pr_warning("Could not register som GPIO expander LEDS");% T+ U+ a2 R0 t- p& p7 E% m
else/ v; _1 b5 k( q, ^
printk(KERN_INFO "LED register sucessful!\n");! [# ?6 M i$ R6 Y; |3 G
; a; |+ B! ~6 ]
return ret;
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& F0 z2 I+ @. A6 }4 l. F2 A* [$ j7 Z, Y. Q1 H, E
static void __exit led_platform_exit(void)
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platform_device_unregister(&da850_evm_tl_leds_device);) L9 c' A5 {5 ?" @) [! q: Z
; f" p9 B+ Z3 g+ ?5 S& P) | printk(KERN_INFO "LED unregister!\n");
; x6 x# D. a1 q" ~! n' Z7 X0 V" R3 b}
+ V# P5 d9 N( E" L
6 k$ K6 m* C& Q! {0 Qmodule_init(led_platform_init);5 P/ q* X* A) Z( V3 w; }# w
module_exit(led_platform_exit); ] M9 n& {- L
+ T) `5 |! M& ~0 c' B8 u) W4 g/ X: ?. n5 h @
MODULE_DESCRIPTION("Led platform driver");
% F4 {5 N0 K( ~, O9 cMODULE_AUTHOR("Tronlong");
/ \8 A t) I3 J9 U' r& @ }MODULE_LICENSE("GPL");
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