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求大神给下面的程序做注解,请稍详细些,谢谢。 H, x$ c5 U$ `! k
#include <linux/init.h>
$ x% G6 c. P" i% z#include <linux/module.h>
5 j0 c( w1 v7 k' i3 y#include <linux/kernel.h>* c& z: n7 U- O" F7 U1 k
#include <linux/types.h>; o# ]* s' h1 v4 [
#include <linux/gpio.h>
4 Y, X6 I9 N( Y0 {$ x1 p+ y* d) |#include <linux/leds.h>
+ a' J8 T# {, l+ |: G3 U- f% V#include <linux/platform_device.h>
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#include <asm/mach-types.h>$ D7 e3 K @$ H% i
#include <asm/mach/arch.h>
( z3 U% C( g' \#include <mach/da8xx.h>" b" |) n( Q+ d. p* T0 S7 j
#include <mach/mux.h># G z( \ }/ g* A$ I
) U& b0 w1 ]/ q- {: a4 t#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
2 e. S, f/ [# S! S0 q1 o3 Q#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
7 {# M& b# k! K9 G$ ]8 R& {& B#define DA850_USER_LED2 GPIO_TO_PIN(0, 1), c: s8 C& i% M. }
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)' {6 ~% E% @3 x; z) U4 k) w) H/ C
! B' h8 F8 X5 [, l' c- s/* assign the tl som board LED-GPIOs*/
/ B1 p; }, O1 e9 Jstatic const short da850_evm_tl_user_led_pins[] = {
) D6 \6 {$ C8 r4 S9 ^6 f /* These pins are definition at <mach/mux.h> file */
- l/ I- a2 l8 R9 X) K, a+ j1 E DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,. ^! p8 H# K0 {) j/ y
-1
+ g) d- i5 E) w2 t% Z. \};
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w, ?$ Q; K* Fstatic struct gpio_led da850_evm_tl_leds[] = {) g/ k- V# \9 f5 c$ j( e7 |6 w+ M
{
% G3 U! t! g$ B* b. H .active_low = 0,, `# ^! e7 g3 s
.gpio = DA850_USER_LED0,
& `+ u0 ^! t" Q2 V* y! O/ } .name = "user_led0",6 ]; V- n Z8 Y, q2 U$ q" Q
.default_trigger = "default-on",- X1 ^3 Z" [1 i- F: g
},
" ]0 o+ t& u, u {
9 m) g0 u! x" R5 {$ |; a .active_low = 0,, o2 N8 ]4 E5 E9 {) v% w9 A
.gpio = DA850_USER_LED1,( |/ x% k+ h8 j- O) E( l) | K5 L
.name = "user_led1",6 K4 l5 h! F; u. ?. J
.default_trigger = "default-on",
- s4 k# \+ x: N3 }9 Q k0 e# X },
, L" p( q6 i p. j! K# i, b {
3 g5 I) J0 N8 s O2 N% Y( d- v0 H .active_low = 0,
, |; G( R. E5 o' j, s( |: ]2 _ L .gpio = DA850_USER_LED2,9 x9 T% y0 ?, j, k1 L) e, Q
.name = "user_led2",& ]' Z8 j( J$ u9 `5 e% s
.default_trigger = "default-on",
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{* Q! w& S( b) P, a2 s
.active_low = 0,
1 i w) \ T: k. { .gpio = DA850_USER_LED3,+ S* [' y4 V; E
.name = "user_led3",' d/ @8 J# ~: A# r) j% q
.default_trigger = "default-on",7 p2 H& j3 q- j* w
},
K Q: n5 y: f3 {3 N/ C; p3 B9 y: k};# q8 _- W1 v3 a- h. K& m
8 f# }! ^; ^! estatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {0 n- w! |: {' F+ e4 p5 V9 ~
.leds = da850_evm_tl_leds,) R+ B! p; g- M- f9 w7 W4 \
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),. S! b7 U# y" P) `. X+ D+ J0 M
};
7 L8 `; }4 I4 \5 u( ?5 v
- K4 l( L9 u& Q# ?static void led_dev_release(struct device *dev)
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};
\* ]3 ^" ?6 [6 C b+ O3 E6 V; ^* j
static struct platform_device da850_evm_tl_leds_device = {
6 z' Z$ i3 @) t( F .name = "leds-gpio",
' l+ u0 a, S4 R .id = 1,
; d. X% R" b; b+ V& b& Y) } .dev = {2 Y2 O( ^& `8 X
.platform_data = &da850_evm_tl_leds_pdata,
5 ~. w' G' k5 W3 B .release = led_dev_release,4 U- r4 i& H$ D' p- r
}! V7 l& t$ @" J* ^! w2 R
};6 t, s# ~2 f, X- k: T- g4 ?
9 m$ k# i: V- d( V# _static int __init led_platform_init(void)
' k6 ^5 Q' P D# o{1 U# Y+ b- ` u
int ret;+ u/ t( g( R9 Y' q
#if 0% L- N k% ?- b5 T2 Y0 e
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);! D* O2 \3 s8 I* _5 ^ J/ G: r
if (ret)
: z Q; G2 R* d0 ?) Q5 o- \ pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
0 H/ r) \$ G' Q; E, {" H4 K8 R "%d\n", ret);( L$ C2 g4 R& e# m- M4 n4 a
#endif2 q' k4 d% H9 _0 v
ret = platform_device_register(&da850_evm_tl_leds_device);1 u* w. S. F$ H. f% W' M- O
if (ret)
! W2 @7 W8 g O6 | pr_warning("Could not register som GPIO expander LEDS");
9 ?. C3 F+ h* }) j' m$ o6 R4 X else
; ?& z' x {9 L- g% m3 N4 ~! s printk(KERN_INFO "LED register sucessful!\n");6 ?- X( H, }7 n: {
% l. l( \' t2 N B, l5 \- K# u
return ret;+ C% |$ z( Z4 K7 A! ]; v
}
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static void __exit led_platform_exit(void), Q c# b L. F* N0 }# s
{' m+ Z2 ?, o/ z: Q, {+ ~$ m! q# M- W
platform_device_unregister(&da850_evm_tl_leds_device);
$ _( f- G+ ~) n) ~+ d8 r0 f) h; v0 p) b4 N2 l) i
printk(KERN_INFO "LED unregister!\n");
% Z& f0 C6 W- B; h/ p}
1 j7 Z- @/ g( X4 Y5 ^
1 x; E: J" g7 F4 v/ E, ^% s7 Umodule_init(led_platform_init);3 g- i$ {8 {* ?! t2 X
module_exit(led_platform_exit);0 K3 D# p) h8 i3 B3 W; a& T
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MODULE_DESCRIPTION("Led platform driver");
/ z' m/ ?5 H3 U! c" k# J4 T3 s3 M+ wMODULE_AUTHOR("Tronlong");3 y1 D* E* Q# }% F, V) b7 s* r
MODULE_LICENSE("GPL");4 j; t! i1 [) M# L% _; I* k
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