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求大神给下面的程序做注解,请稍详细些,谢谢。8 V5 H1 s. s/ U. H/ ^
#include <linux/init.h>' } L- k8 W/ p) j/ E3 Q' K
#include <linux/module.h>% h3 F) h( X* `! D
#include <linux/kernel.h>
5 _4 I, U! X# W3 E7 m#include <linux/types.h>9 Q; H) g* G& q2 y- \" e& O
#include <linux/gpio.h>4 }. {% z) i! X9 B, Z" D/ s
#include <linux/leds.h>! O: x0 x t* q% y0 A
#include <linux/platform_device.h> c& Y( {* P. }4 @) F
) {( j4 b- ^7 N
#include <asm/mach-types.h>
+ N9 O; S/ j+ \& k( N7 G7 N- ]#include <asm/mach/arch.h>
$ \+ X6 B+ z2 J# T5 Q#include <mach/da8xx.h> T0 g, V( C0 i$ l- K
#include <mach/mux.h>
) M. |+ H, I& n* }
3 k' P$ T& n' |8 x#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
7 G6 j R/ }% q3 y3 W, R j" ~1 W#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
6 e: r2 b9 t# C6 b5 g% r5 [0 E+ C#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)6 T$ X }2 p [4 ~9 I
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)' B7 O+ s: u R/ o% i- d
9 v8 u, C2 Z1 A6 u
/* assign the tl som board LED-GPIOs*/
9 D: c$ q! E2 k* I! nstatic const short da850_evm_tl_user_led_pins[] = {
" l4 Z2 t$ ~- J/ w" _+ X /* These pins are definition at <mach/mux.h> file */, h! U5 ?/ j6 a2 V! z: I# U
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,1 U1 I5 |0 U; N3 h9 q: ~$ Z
-1
5 {, P/ G g1 Q7 c( d1 K8 P9 }};; L& d! }) c: J
0 A. J! L% { N9 {3 e
static struct gpio_led da850_evm_tl_leds[] = {9 b( x j7 u$ R" [0 i D
{
' z: P7 p, y3 z2 b/ H& N .active_low = 0,8 `' v3 N# z. W
.gpio = DA850_USER_LED0,
, }! B0 R6 e1 v9 ]9 o! o' d .name = "user_led0",
k+ i: w1 r0 _# R' m5 d+ I .default_trigger = "default-on",
0 }$ C& ^ x Q B },; U: T# V r" x' r& C
{7 Z0 F7 F' U: z0 F
.active_low = 0,) m# }# E, j- o$ n& B/ m0 E; P' P
.gpio = DA850_USER_LED1,, [7 _0 T! R. D
.name = "user_led1",
; Q1 Z: X4 n, U1 ~% A9 o .default_trigger = "default-on",0 ?3 y; ?! E& k# b
},8 C, y# ?& s7 c1 T% G6 w. D
{; C- C8 y3 G7 m1 P
.active_low = 0,8 P3 A( N+ ^# A6 b" D5 _
.gpio = DA850_USER_LED2,0 r) h; A# i# h% E
.name = "user_led2",
6 C) j* q' G7 v/ t) O .default_trigger = "default-on",1 Y( Z9 x6 k- z* Y$ z2 ^7 R: H0 t
},
+ r2 P& J8 b, l" F9 Q7 n0 n {5 Q2 \4 a9 s4 ?
.active_low = 0,
8 X* [% Y' q* I3 F/ k2 C .gpio = DA850_USER_LED3,
" f' K( D7 c% C .name = "user_led3",
: R7 A' ^( O% `) Y+ y7 c6 ? .default_trigger = "default-on",0 |1 R- Z6 S/ O7 N8 c0 [' Y( }, u
},- ?* C9 X; y4 ?! j: h y! R
};2 t5 k1 S# Q6 i4 x3 B% |" O; v
( B7 ~, c% H$ b. p/ Bstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
: W+ v- }) l0 X8 T" p1 Q .leds = da850_evm_tl_leds,8 o/ b, f( c8 e
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
2 E, |7 h! V) C' B) j};( u/ L. y2 Z! [! x3 I
4 u9 a) e8 @4 X, p3 f3 i! {* l
static void led_dev_release(struct device *dev)0 J& S1 G+ @ t6 g6 `0 l
{
2 R; ?( o* N$ W' p% N};1 {: W6 p" v' W
$ G# ^5 [8 k# D
static struct platform_device da850_evm_tl_leds_device = {6 }, y* i0 q- D2 N$ \6 o* k$ J
.name = "leds-gpio",3 l3 e$ k7 ]. W' V- H1 Q& ?
.id = 1,
/ p& j2 q5 j) {; }+ S0 o .dev = {* D8 O2 f% q4 V7 s% a0 _6 A
.platform_data = &da850_evm_tl_leds_pdata,$ ?' Q( g$ v+ w6 X! n6 x+ `
.release = led_dev_release,
- z6 A, y' n) t }
5 |% V/ z8 O, x8 m4 T3 W5 j};
; l; A* `( A. P6 [- m* X
* m! U% k' ^: j9 Ustatic int __init led_platform_init(void)/ ^4 e$ w \% @2 M3 V K- E
{9 c2 L8 r( t+ z6 S/ a0 ~% H$ [, Q
int ret;
, `2 y' E1 ]" L7 q) b#if 0! s1 F( M2 [7 H# u4 L7 j3 X3 h
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);7 y* {) O3 q9 t: d7 I7 I l
if (ret)/ J7 J$ N6 O# x" w
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
6 D* }- F" h* G( A3 w. F( ~6 i2 C+ ]: P "%d\n", ret);! X# }- C/ {# ~2 e- U. ]4 W+ i
#endif {4 t @. H8 r/ }8 Y/ K
ret = platform_device_register(&da850_evm_tl_leds_device);* n; T% y7 f* x- E9 [
if (ret)
" H( G! B, S& q: k7 }3 P pr_warning("Could not register som GPIO expander LEDS");
) l4 p8 T* J1 A; A q% V& E1 t else
. U, @0 ]& F1 L3 s printk(KERN_INFO "LED register sucessful!\n");- {7 W9 \2 D" D, U, K
2 I+ V1 a0 v1 E" V9 | return ret;
5 ]* }2 e4 j8 v5 P}5 m- h& r0 ?3 L9 l
. \ V L% U) [, Q+ \
static void __exit led_platform_exit(void); n1 k+ \% C( F7 w2 h, n& }
{
' Q: a! u8 R( p0 ~: [% p* z3 |/ L platform_device_unregister(&da850_evm_tl_leds_device);
: U3 b3 ]! s/ e) s8 c& z% h1 ] V2 h& M9 d: b) B
printk(KERN_INFO "LED unregister!\n");
3 p1 @7 c, j; |7 D4 k$ n8 C$ j2 o* Q+ h}: ?0 I x8 N. ~) e3 @6 ~
8 a" a) a; f8 g# j$ ?; U
module_init(led_platform_init);
: t6 P% g0 N0 a* ~* ^module_exit(led_platform_exit);' |( d) M# J2 N- [; _
% G/ H/ k: t5 QMODULE_DESCRIPTION("Led platform driver");
1 s! s( m3 O' e% {# q& H5 GMODULE_AUTHOR("Tronlong");% ~, C; G1 u( b% A& q
MODULE_LICENSE("GPL");
% }; d3 S# n+ N. [, q: {) Y. |$ i0 x0 l/ t9 V
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