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求大神给下面的程序做注解,请稍详细些,谢谢。
' I, J1 {" {0 M#include <linux/init.h>
7 f: S5 Q8 d4 C% l! G8 _; y: J#include <linux/module.h>; m; r Q+ a! q! c$ A0 h( s$ {
#include <linux/kernel.h> s& U6 c( r5 G
#include <linux/types.h>
! e# F/ b8 h' Y9 N/ @- X#include <linux/gpio.h>& t2 W3 e3 y+ V0 t3 R1 C1 ?
#include <linux/leds.h>' S* L1 d+ H. M! v& T3 Y
#include <linux/platform_device.h>2 h# D) r( K# O6 y3 I
. s$ N6 i* ?! i) n" F8 D#include <asm/mach-types.h>
, k* Q: l! d: f& y9 S#include <asm/mach/arch.h>) |8 U6 e% ?! a6 K5 ~ Y
#include <mach/da8xx.h>/ |' T: H) g S+ Y
#include <mach/mux.h># t% r5 L' @" y) s$ ?. c
$ U' f' q8 @# u o. {
#define DA850_USER_LED0 GPIO_TO_PIN(0, 0); |9 e" t4 _, E9 U) W) C& z( A
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
4 ?0 u! d: ^1 \: f3 L" b0 ^: n#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
; l" y/ r* @$ P [#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)0 M6 d. T" Z) c5 J
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/* assign the tl som board LED-GPIOs*/
5 a1 J7 w3 b' I( Dstatic const short da850_evm_tl_user_led_pins[] = {
0 T3 b# S7 D% n$ T7 p6 ^ /* These pins are definition at <mach/mux.h> file */
: ?* u' P( ]/ Z DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,2 `1 `" Y2 y7 C! `- x
-1" Q) A, e7 C: X0 q+ \9 {) O: M1 e. }( Q
};
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static struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,
* R6 r2 W7 I z& ~& _ .gpio = DA850_USER_LED0,! z. ^: d& p0 _3 z/ a
.name = "user_led0",- F" v# M8 C% r. o
.default_trigger = "default-on",' O2 R4 ~7 u0 N( _8 o* G6 w: Y/ H
},
% ?6 i1 U& J7 }4 J4 G0 @ {. Z5 \2 p3 x" @( S5 w
.active_low = 0,
6 [8 u* R g, [. H$ z2 B% h .gpio = DA850_USER_LED1,4 Z4 T9 q7 p" i; d
.name = "user_led1",4 C9 ~0 E# @3 U+ A. o, a% Q- o
.default_trigger = "default-on",
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{
8 d: _ E" C8 [. M9 X0 p .active_low = 0,+ k. ]' E, D5 i( Z: N
.gpio = DA850_USER_LED2,3 K) q( U% m" F9 C
.name = "user_led2",
- b# ^$ g* B/ y* C6 w .default_trigger = "default-on",
* t/ Q5 o' g0 K2 f, b },
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.active_low = 0,0 B" E% K+ [+ k/ i/ F
.gpio = DA850_USER_LED3,+ G- i1 O$ f7 D+ u3 i: g; C, t5 U
.name = "user_led3",6 k9 [+ f( q" i; y2 z. v0 R$ H
.default_trigger = "default-on",
+ [8 Y! o6 t* i2 P- G8 K },
* q8 _5 h! E6 I9 p9 r& h4 N4 g};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {7 R' t d% I- m
.leds = da850_evm_tl_leds,
5 t# I) S% Y e2 W" N .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
( N- v ]8 T* C( F6 E. S};
6 l% j4 P, x. R! P3 f+ C s: P: q
static void led_dev_release(struct device *dev)
$ I" o7 a$ a; L( h; ?. b. V4 m) K s{
8 s/ p# o/ w% A' H9 J};
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static struct platform_device da850_evm_tl_leds_device = {1 P# B4 J6 q Z4 b" z
.name = "leds-gpio",
- K: Q6 l( d+ G4 T) J0 n: q5 O; ~ .id = 1,6 [! f# @( f6 y
.dev = {9 p) S. g8 V/ t x
.platform_data = &da850_evm_tl_leds_pdata,
[7 A" |+ G) @2 K/ g5 T .release = led_dev_release,2 G! p+ U( }, ^. |# {7 G
}
5 d8 j3 j0 w" f) `1 T: v1 ?};
$ N* m; w; v+ F6 v& l, c, q0 m; \* b8 M
static int __init led_platform_init(void)
T- [7 Y/ ]: f& B: M. p& v{
) [; \6 J# L% P; G. f/ H int ret;
# f8 n' z3 V) l#if 0
: v) y* m% g" D1 G: r ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);, W& V" N+ L/ R0 H8 ?( m
if (ret)& e3 K" @6 y B
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"# E$ h" H3 D# J' r6 d
"%d\n", ret);
) {. V) F! z6 P. }' N3 N#endif
, D! t* L5 k7 R, ]' r( ^ ret = platform_device_register(&da850_evm_tl_leds_device);
% K; j6 I3 K" y* ? `6 c. N if (ret)
1 I" }6 [0 u+ D, t pr_warning("Could not register som GPIO expander LEDS");
6 @# [6 t# {- _2 I$ k/ | else! @* ]" |; G4 q
printk(KERN_INFO "LED register sucessful!\n");
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3 z9 m; [3 s" f/ I+ ^! D- h9 A return ret;
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# U! I/ j2 _' I( S( B' ~3 kstatic void __exit led_platform_exit(void)
4 V. ?9 |. a/ @" i5 W( }4 o{- L% k* U' o" s8 H1 P
platform_device_unregister(&da850_evm_tl_leds_device);
, k J& o8 j3 q+ m( q6 h
5 j( h b2 I1 k4 `/ b/ i printk(KERN_INFO "LED unregister!\n");
- t# c/ C) v6 t- r: d; v}
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module_init(led_platform_init);2 ~% p, D5 _3 }5 ~
module_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");7 j- l8 l9 f! R4 ? @3 a+ l5 B
MODULE_AUTHOR("Tronlong");+ k3 n% L( w- R# Y( ^
MODULE_LICENSE("GPL");2 f! t6 Y7 o1 O, S E$ o% x8 X
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