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求大神给下面的程序做注解,请稍详细些,谢谢。
$ @( [; Q) G2 A [/ I2 m1 W#include <linux/init.h>
# e. T' e6 ?, g" P3 e6 D#include <linux/module.h>
4 J$ m% N i/ P1 |#include <linux/kernel.h>
2 h( L. t. m) V" k/ ?5 r" p9 o#include <linux/types.h>. Q3 J% l3 Q" b; Y# g1 y9 l
#include <linux/gpio.h>" T8 f% k" J) G/ i
#include <linux/leds.h>7 {1 C( t; b3 _6 i/ J
#include <linux/platform_device.h>
" b2 ^' E1 d! V1 k9 k9 b, Z
9 L: a2 A( |6 ?9 c1 g#include <asm/mach-types.h>
! Y/ G* ^/ f7 E#include <asm/mach/arch.h> E6 x8 C& m3 M7 K* _" l# X
#include <mach/da8xx.h>% X. S3 x0 I I6 i' j2 e) a
#include <mach/mux.h>5 i! G; |+ M0 _9 z& \6 K
5 L/ g) e2 `% S b* a; P9 L) }
#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)7 M* i( G b7 r# L
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
+ D7 S! B/ E4 \) a4 N#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
% W K6 p" x1 o* K/ s# ^#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
) A8 |- ~' u6 l( E9 }+ K1 i! F. x4 [6 ?9 q: p
/* assign the tl som board LED-GPIOs*/
9 F7 |, z: D" g zstatic const short da850_evm_tl_user_led_pins[] = {) p: R5 U: }$ ?6 u" U& Q
/* These pins are definition at <mach/mux.h> file */
5 U2 V0 c }# F0 ^) i+ p1 @ P5 ~ DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
8 R# y3 o4 S8 s' V9 u- p0 f8 ^& b- } -1; t- K- v ]& r3 M0 r; |
};( i5 B/ V! V% f* x4 W+ h
* X( F" D# [3 o* u4 C" S8 bstatic struct gpio_led da850_evm_tl_leds[] = {
/ [- [! a+ V3 P$ v {
. V0 Q! T+ g1 y O) x .active_low = 0,
: o: D- [5 Z, z4 i6 U/ k .gpio = DA850_USER_LED0,
% y, n3 V {. a' s4 e; c .name = "user_led0",
1 l s, c+ i% Q( P .default_trigger = "default-on",& o' u! v0 K1 A$ a$ i" Q
},
3 \4 _8 J' m6 @- ?1 c# P0 c {# T$ q* a" l9 ^# g
.active_low = 0,% j- L+ I8 X8 }6 c! D2 l
.gpio = DA850_USER_LED1,/ C% b; `" \1 n6 g7 x9 J% U
.name = "user_led1",
7 I0 p7 {8 A6 B p .default_trigger = "default-on",
& b9 F5 Y; r) Z( W9 f: u' n* f },
6 Z9 G6 N. k v7 o3 w/ x {
" j8 K$ E/ J* L5 b, s+ s" k .active_low = 0,5 B7 |, z$ m5 q/ s+ F: D
.gpio = DA850_USER_LED2,+ s0 |- W4 v" u& d0 R/ t0 z, V
.name = "user_led2",7 K) @. ~0 l5 a1 C1 @& e
.default_trigger = "default-on",
% Z' h$ C4 j9 O2 F& N' C },
& x( M! o9 V4 q {
" F( C8 e: Q: n- Y' k .active_low = 0,7 x3 Z/ O, j# D a
.gpio = DA850_USER_LED3,
" m7 |! i/ D* k .name = "user_led3",
% b8 @6 k4 p& d1 D% ^4 c1 Z .default_trigger = "default-on",1 ~6 j9 ]: {5 T8 l1 v) L9 }& u" j+ Y
},* ?9 Q2 d7 U; _
};( b& ?8 H4 T* @- B D" ^" c
; ^; F# b! w" Q, Y- M; R0 }/ H1 C
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
! x, v/ [5 v+ [7 J0 S .leds = da850_evm_tl_leds,0 V6 O+ R" ~! i( Y% K6 e
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),1 v# C, @/ J4 I- X7 D0 m6 R
};
6 q4 V$ v3 ^7 Y" [ z Z6 S; U1 C# u z5 ~9 I
static void led_dev_release(struct device *dev)8 c0 p3 c+ z* w3 K) M: O
{$ @$ W% c8 i3 {, P0 p
};
- ~+ \9 ~1 l$ c1 j( [, ^' d
- F8 \) x1 l! c% ]static struct platform_device da850_evm_tl_leds_device = {
( f; G5 M* t5 | .name = "leds-gpio",
) N$ I+ d; s* B% x5 \- q .id = 1,
& @0 S' Y1 G6 ^3 k- i% G' ~ .dev = {
n9 h8 G4 u8 S) s% G( ^! _% W .platform_data = &da850_evm_tl_leds_pdata,* C& g. c- c& l( ^6 Q9 T) R
.release = led_dev_release,2 w8 a7 [7 `+ g+ R8 G) o
}5 f q5 ?3 Y$ L+ D0 y8 p! N3 o
};
- P: N2 r; J+ @7 K$ S( c$ F3 d, ]4 S! `
static int __init led_platform_init(void)
9 L/ `1 D+ _# K{
! B6 O% B! R( ]: \+ R int ret;
. g8 z2 X: a! r7 d#if 0
! t+ ?1 t3 i* Y( P( a- S: w ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);9 u$ x& C2 T% J/ @7 S# \9 u
if (ret)) s, q* f0 q4 d. B, {2 S; }
pr_warning("da850_evm_tl_leds_init : User LED mux failed :". k) Q- Z& }( s8 d
"%d\n", ret);
7 i+ Z( T; f6 W) V p4 p0 q#endif. U0 k$ O( B( S- W
ret = platform_device_register(&da850_evm_tl_leds_device);
" o. H% s' ]; Q3 s- k if (ret)! A% I' K) Z% \* r1 T/ K4 P
pr_warning("Could not register som GPIO expander LEDS");
3 m" G4 U$ x* s" l, r else; L; l9 o8 o% C% }
printk(KERN_INFO "LED register sucessful!\n");
4 ^9 r6 l: b" Y, @& j
' B" r4 n6 O4 b, d7 d return ret;
4 G. D' i1 x% x. ]8 ~}8 ?$ [1 f" O) I
" a# C u! z/ D. ?, zstatic void __exit led_platform_exit(void)
( ^' ^& J7 C6 H+ e. M/ r. w) R{
& Q, @! ^- W' p! t7 p platform_device_unregister(&da850_evm_tl_leds_device);; S( J5 Q3 X1 p' t; ^$ `
, G7 k& ]/ k4 V$ m
printk(KERN_INFO "LED unregister!\n");
* B$ z, M8 q. @/ }( G8 ?}
; c9 j4 }+ Z' h: D( D# P! Y. N! m6 \2 y8 s" w1 u; `9 R
module_init(led_platform_init);
, d7 H7 q: U" t& U$ A4 P$ [, F$ e3 Amodule_exit(led_platform_exit);
5 x7 M. B# ~/ [2 s/ A; h
( e9 O; ~ i1 m; TMODULE_DESCRIPTION("Led platform driver");
7 [ ^4 f- ]7 ^0 d% z) @& MMODULE_AUTHOR("Tronlong");4 p6 r7 t/ W0 n7 T3 i9 b
MODULE_LICENSE("GPL");
8 S) _, J; R" W/ }
7 R: ~1 @) F+ S; x1 N2 T1 P |
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