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求大神给下面的程序做注解,请稍详细些,谢谢。2 w" }- t" T. N1 ]/ F5 l3 }1 ?
#include <linux/init.h>. P; M* v* y2 r
#include <linux/module.h>
3 u' U! K4 p: X8 E#include <linux/kernel.h>! `" Y8 o$ v3 z- G
#include <linux/types.h>
4 B+ u+ ^# ^6 E: F) O: V! ?$ K' r#include <linux/gpio.h>
4 {3 ^4 T! y, r, B* Y( V) ?1 }#include <linux/leds.h>1 ^( ^, q4 s% N& j& u1 U, G% J1 s
#include <linux/platform_device.h>1 v) f( ^; D4 [& O* ?
9 Y& H& w. d. E% X) M4 j4 Z#include <asm/mach-types.h>
2 |" J0 k0 r1 [' ^5 S- [7 t#include <asm/mach/arch.h>1 i1 o% W& p. w9 b# k
#include <mach/da8xx.h>
. ~! `- [$ q( T$ V5 I v7 Q#include <mach/mux.h>% S2 A, |. R% v) Q. X
0 E, |6 e0 Q* n$ e7 b8 f#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)6 L# j$ `# @) y( q/ A+ W/ E: a( f" Z! _
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
' C9 ~# A9 M+ _( D% k( \$ R#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)6 U. a1 O1 N% `' V
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
# s% R% o C9 z, V/ B2 n5 ~2 O- `8 K% H5 x- |# Y
/* assign the tl som board LED-GPIOs*/0 R- c6 N+ j5 B, D) F$ |7 k
static const short da850_evm_tl_user_led_pins[] = {
+ t* `! T% n, W /* These pins are definition at <mach/mux.h> file */
1 Y5 C4 r1 x/ P DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,3 n) f- x m _( G. G) U( V6 \
-1
& b5 b1 t5 r1 x};: o$ F0 ]9 ^4 g9 w s
1 O6 F* e$ F' m0 O- D3 wstatic struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,
" a% Z9 `- V& Q' x4 ~; t .gpio = DA850_USER_LED0,* v/ Q5 n8 \+ K4 G3 \0 U5 F
.name = "user_led0",
1 U& u( }. Q9 h5 a .default_trigger = "default-on",9 [) p7 p4 S- Q# d! v w0 ~
},. Q* l- M) d6 ~5 o
{3 p' V/ h# g/ B, B& G. [% A
.active_low = 0,1 ~' y+ q- B2 X
.gpio = DA850_USER_LED1,1 \' L/ L( l2 G6 x
.name = "user_led1",
% D! r/ D# P/ z' Y .default_trigger = "default-on",
: {- [8 V4 T) I! K },/ i. z, K* D# }- p- G
{) K2 Z4 ]( h7 l: Q
.active_low = 0,/ Q/ v0 V: ~. R) F- D- ~
.gpio = DA850_USER_LED2,4 A3 ^; U1 n2 e2 s
.name = "user_led2",4 N/ R O- u7 c" B& u
.default_trigger = "default-on",6 K% i) U# x* w( h- C
},. g( i; u3 a2 b& _2 N4 ]7 h
{
6 U& p$ {. b( w; _0 \! r4 Z .active_low = 0,8 p0 F7 Y; T1 B- t7 N- r
.gpio = DA850_USER_LED3,
1 c r- A( Z( I .name = "user_led3",
9 }% A" T5 K% X h. D9 f' L .default_trigger = "default-on",+ F& } f) E4 U% I! K
}," @+ P. g6 A+ e, V p* X! v
};
$ S0 }" }/ \: |8 N5 m- [1 H7 c( |1 g4 \* V! M% C
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
0 p. [ w+ E5 i6 e5 g .leds = da850_evm_tl_leds, m: ]: {/ ]& P$ L. z
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
' O8 \8 L1 b8 j};/ U% I6 o9 z- ?1 p( g$ Q2 s
* ?" h+ X& A7 o( n; d: u3 g
static void led_dev_release(struct device *dev)
% S& i: v- ?* y. u g4 v{
- a7 R) g5 W0 }};
3 l5 k& {% P( |# Q3 P2 r- V3 L2 P0 |2 D6 }6 \1 C
static struct platform_device da850_evm_tl_leds_device = {+ y/ c' U9 o0 L! g8 A
.name = "leds-gpio",
; F! y5 T" M" m0 X" g& X2 N) K$ P .id = 1,8 G+ y/ L# x# M
.dev = {8 t% K% |2 U8 R/ T. |% {) i
.platform_data = &da850_evm_tl_leds_pdata,) a2 R3 q8 M# a# U% D
.release = led_dev_release, Z8 E% S* [' z" F J
}, q3 u6 T$ Q7 b% m9 C
};
+ S; D/ N2 R0 H6 T3 q2 t
& R4 i+ H! q0 A( k* C/ \static int __init led_platform_init(void)9 W+ _% p9 |1 E
{6 }1 i% N5 S5 N* j/ k& B
int ret;( F/ {5 r/ Q/ k/ `) \
#if 0
: c: j2 U+ E* ?/ T" |, V4 j5 N ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);$ @9 v$ O. ~8 H1 Q5 `. k+ e$ [+ ?
if (ret)
+ X- r3 |" f5 i$ G* p! V pr_warning("da850_evm_tl_leds_init : User LED mux failed :"' z4 g7 {& k( Z3 o- g
"%d\n", ret);: Z# V+ a7 w" i1 z; y
#endif2 Z& J# U: |) u
ret = platform_device_register(&da850_evm_tl_leds_device);. u7 Z. C( E$ e7 Q% v [6 ~
if (ret)* d, u# j0 E3 `8 k* a9 Y* W
pr_warning("Could not register som GPIO expander LEDS");
& r( z) p m4 p else
0 P2 S2 A. c, ^$ S% w9 u( z printk(KERN_INFO "LED register sucessful!\n");
/ F) V9 x) N% }
& C( k* k$ Q+ `/ r return ret;
8 L' d s+ i7 D, ?) L$ f0 v# H}; o2 A/ j0 W) I& |$ {% Y& O
F/ r3 g9 X3 _! ~" qstatic void __exit led_platform_exit(void)
5 }' D M+ k5 F{# D" q ], e# [7 L
platform_device_unregister(&da850_evm_tl_leds_device);/ R, j ~9 v; Y+ ]
& G; S+ C) }( }2 `* D( C' {6 f+ c
printk(KERN_INFO "LED unregister!\n");
9 \: C' H8 g. Z; q/ Q}
, H# A/ O: E" T+ W& O& ?
% v4 j. {1 A9 c# I7 b' Smodule_init(led_platform_init);
0 ?) K! {, r# d' H8 l6 W8 Xmodule_exit(led_platform_exit);' ^8 b$ D. `% i7 D% ~! c+ G
0 A/ P" s, C$ EMODULE_DESCRIPTION("Led platform driver");
# |$ W* I4 L! L# yMODULE_AUTHOR("Tronlong");
+ Z2 `, K" C* A* G+ T4 _: F2 ZMODULE_LICENSE("GPL");! Y& |) q T" I: x5 n7 [1 o. ?
& R' ^( O' Q+ n2 v
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