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求大神给下面的程序做注解,请稍详细些,谢谢。
: p" P# i9 A# k1 a( [+ g0 E#include <linux/init.h>
$ g+ @( p; V% t* |4 n#include <linux/module.h>" v* }% X" Y0 s) i. v; d4 j
#include <linux/kernel.h>
1 V) [0 k, q/ I A9 M2 J#include <linux/types.h>
& t1 C7 H1 _4 {/ k6 R#include <linux/gpio.h>
; ~& D! o$ R0 J- j#include <linux/leds.h>& v1 U: ]& h! h% a
#include <linux/platform_device.h>( k* h: u+ l& G2 h Q
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#include <asm/mach-types.h>3 J/ l. w* c) m7 e
#include <asm/mach/arch.h> f* g% k) V5 l I& o$ r
#include <mach/da8xx.h>
, C! e: I7 Z/ p# D# a! l#include <mach/mux.h>
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1 U9 p, ]$ u' l#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
) k3 O6 ^3 g8 f" K#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)! V2 [1 z; V, D$ h( a( y
#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
2 Q5 x) V% J; B I+ J! V e#define DA850_USER_LED3 GPIO_TO_PIN(0, 2), `$ ~5 K7 h" Y' T) D+ a7 @: P
' _. Y- Y3 S0 A1 ^$ l' X9 e/* assign the tl som board LED-GPIOs*/
+ J7 U. e2 a4 M: t6 y7 c6 p# Y" dstatic const short da850_evm_tl_user_led_pins[] = {) G: G1 D& D" ] w3 b+ S. F
/* These pins are definition at <mach/mux.h> file */
0 s0 `3 ?, V2 x$ R DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
0 m; C6 U- L& _- J5 H -1
/ ]+ U4 u% P$ K) p$ _. k- J};
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static struct gpio_led da850_evm_tl_leds[] = {5 j: Z7 A, H% K
{
( [" d. l8 G {4 J$ i8 Y .active_low = 0,$ f2 o1 E+ |4 j, h
.gpio = DA850_USER_LED0,
9 i7 Z6 o# l+ k h+ R .name = "user_led0",) w" ~2 }$ [1 q. v1 q5 I% X
.default_trigger = "default-on",3 u% ?2 u1 P* `. }4 p; k
},
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.active_low = 0,9 i3 b2 d0 Y6 |6 f
.gpio = DA850_USER_LED1,
0 l! w6 d: q" O' P8 e* R, y x .name = "user_led1",
6 S! U, o" S- u7 E2 O .default_trigger = "default-on",
% p/ Q7 H4 T, ~ },; {! E* a, m0 O# q* K$ v; D7 ]
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.active_low = 0,0 \5 r8 i" C0 y, M4 v
.gpio = DA850_USER_LED2,: r x* s7 l: {; e
.name = "user_led2",
+ {% \6 h4 a$ v) ` .default_trigger = "default-on",
% S4 a: a: F7 p0 v- r7 G/ Z( _ },
$ e" K( O. ], O. | T4 Y2 S) a {
1 N2 ]. H3 _1 M" ^# | .active_low = 0,
7 T2 m! q0 f W$ A' y .gpio = DA850_USER_LED3,
: g. z# K4 V5 n1 v8 j6 g) K+ B .name = "user_led3",
" S1 e2 e; D7 {/ x5 [& f2 V .default_trigger = "default-on",
1 }5 [( T" C2 }" i; y) q+ {1 c },
" h& b; i3 Z) h9 P5 D+ q" [};
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. L0 m, x1 |6 a- gstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = { ^3 d/ W% f$ Q0 J
.leds = da850_evm_tl_leds,# B& U3 ~+ ~' z" b0 D9 P: B
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
5 s5 b! q, L# P r};! y, n7 z: G) a `
) a8 ?. i+ L. S* }0 H: S8 Kstatic void led_dev_release(struct device *dev)
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};3 ^2 V$ [/ @. |2 b# N& E
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static struct platform_device da850_evm_tl_leds_device = {
3 B6 T/ Z% U, Y; M1 Z& P .name = "leds-gpio",! C" V* m7 Z1 c) P
.id = 1,1 m% u$ N, l3 b. J* u! o
.dev = {. v; y7 b1 N! `8 b+ T
.platform_data = &da850_evm_tl_leds_pdata,* y) B' S ^% B# C
.release = led_dev_release,
2 r& d. c. t+ I3 ~ }) U5 M! v0 P/ _8 _
};
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( c: s, T2 f( ~: zstatic int __init led_platform_init(void)
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int ret;1 @# K# o d) D2 `! g* S
#if 0
% E. s' d1 M6 h, r/ v ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);5 c8 A. z2 P3 L" p2 x5 c# X
if (ret)2 x/ e5 ^9 C7 x0 x
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
7 N9 G" e, t# L1 M2 x "%d\n", ret);
$ r: s' ]. }7 K1 M1 y7 z#endif
{. i2 V) p5 t( D ret = platform_device_register(&da850_evm_tl_leds_device);- X/ U9 |7 n) ?( `0 J
if (ret)
4 T; i6 s% v, ?- }, ? pr_warning("Could not register som GPIO expander LEDS");1 G7 x+ x' r9 P0 B/ {. W- g6 d
else. r+ i4 I- N/ G; F: H9 \
printk(KERN_INFO "LED register sucessful!\n");
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return ret;/ E8 H, q# P+ }" r+ ]
}# u0 e+ C2 K7 S, [* T
* d6 H! Y1 W8 J: mstatic void __exit led_platform_exit(void); ]- Z5 t. W3 z6 l, q
{
$ |5 ^' ` C. a$ S/ X4 f% D) U8 l platform_device_unregister(&da850_evm_tl_leds_device);8 z: s+ ?4 ]! d: G+ h9 H0 e2 d
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printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);$ u; @ d" N5 K0 F
module_exit(led_platform_exit);) y3 P9 i9 ]& t G) S/ C7 [
+ V2 r8 A/ r3 [ ^' b: Y
MODULE_DESCRIPTION("Led platform driver");7 Y1 t+ z i3 P. l& A! i
MODULE_AUTHOR("Tronlong"); _) `6 g0 ~1 R" S( h/ J
MODULE_LICENSE("GPL");
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