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求大神给下面的程序做注解,请稍详细些,谢谢。
: @; S* h5 X7 P- n: Y9 }+ f: ?& C6 r#include <linux/init.h>4 W5 X8 m: A5 d f; p; h, R! z3 x
#include <linux/module.h>* O' z% l; ]. n! n4 E; o
#include <linux/kernel.h>6 z8 V3 I: _. G; p$ i
#include <linux/types.h>0 M5 f4 y- d' ]& z" j4 u+ ~, Y& g p
#include <linux/gpio.h>
5 l' \$ [0 J+ s6 o& b#include <linux/leds.h>
+ ^, F- S" @; b7 I; ^2 e+ {#include <linux/platform_device.h>" {( ?! Q, f" i( I5 P- D: X
Z" [2 k4 m% A' C
#include <asm/mach-types.h>: \/ E1 _4 H1 a3 u
#include <asm/mach/arch.h>, ?% M: d: s8 b% A
#include <mach/da8xx.h>
( |2 |2 n8 }9 Y1 b: V8 B, K9 e#include <mach/mux.h>
6 V) ^0 m+ ` \' Y* s; T2 _& _
: n" r- T! G! g) c6 w, H, \: f#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)$ ?3 M) D/ ?2 `0 b
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
- L/ u% t3 x& O" O$ E#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)4 F5 D* p: W2 b9 F& R! P7 Y
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
; \# U0 j4 i' f( O& m" _ G! T: @0 t8 C! M
/* assign the tl som board LED-GPIOs*/
O0 ^( H1 X. I/ j& d4 ystatic const short da850_evm_tl_user_led_pins[] = {
3 e9 N: c Z0 r# B) p# { /* These pins are definition at <mach/mux.h> file */
, k+ ~# Q0 L1 t5 D7 b DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,) { V! g- \4 |9 {5 Q5 |$ ~0 o. Q
-1
1 R" t: H+ [. B1 Y, `! e+ Z9 Y+ C& w};
2 B+ r( T Y& S1 u9 B
* |' d7 g; k% t' v6 \static struct gpio_led da850_evm_tl_leds[] = {( N& E' o0 _) {. ~( \. P
{
# L+ G4 M |0 N0 }6 j7 s/ t( }8 P .active_low = 0,# F _, @/ P% m
.gpio = DA850_USER_LED0,: }! c; L1 C- d) d, P8 [& G
.name = "user_led0",
" W7 J; X' N2 f0 F' q .default_trigger = "default-on",
: L2 |9 V {: x1 @6 Q3 c }, N$ {! k# a" t- c
{$ G9 W4 H" }8 D( j: X. S& E
.active_low = 0,
) r- c9 ]4 \) _+ W .gpio = DA850_USER_LED1,* |8 V, Q) H' w) m
.name = "user_led1",
* o# E; T' { l- i( g .default_trigger = "default-on",; [/ ^& ?1 j1 w' Y7 y
},9 H$ @# k5 b. r. \
{$ }2 w# Q! r7 c& l: {
.active_low = 0,# r1 m- [2 L- L7 V6 G) m
.gpio = DA850_USER_LED2,: d* |. h2 y3 S) d) u
.name = "user_led2",( c8 f( a; x' A+ j( r
.default_trigger = "default-on",
. {9 q3 w% o9 T },
2 b5 m0 k+ W' {) f7 w0 F3 b {# b8 P- {, o5 N- L% R7 H- L, l
.active_low = 0,0 w; c* [ O/ {$ Z
.gpio = DA850_USER_LED3,2 \: c3 M$ |* W z& f( V, D
.name = "user_led3",
3 o+ f+ k% h. H& X9 r( [ .default_trigger = "default-on",. `/ e5 y, S! C: W* w
},
( G, c8 i; b% Q/ c' s" p3 k};
8 |; V2 K. T9 B* R& N% R5 g0 y o: w0 q" h7 q3 f. N/ m
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {) f) h8 K* C4 G8 L' a* Z) T
.leds = da850_evm_tl_leds,3 `* k& U: h! `- v7 z/ W
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),6 u$ H7 s; x4 O
};9 G; x* ~- z- _; K/ K$ W5 i" l
3 h) X& Z8 E7 N7 ~/ }& d! P
static void led_dev_release(struct device *dev)
1 g8 c& U5 f' b{
9 L8 d/ T* Q& o8 Z" t1 E4 l};
! B. T4 q5 U# U
) L8 L" T' p1 W& z& P. B) bstatic struct platform_device da850_evm_tl_leds_device = {
a$ j" \% J3 J0 Q; u- L .name = "leds-gpio",
0 {3 Z/ v8 \# G9 @2 c! Z .id = 1,' O2 G! C% y2 P+ H4 h
.dev = {' }* O* D5 }9 T: u% q
.platform_data = &da850_evm_tl_leds_pdata,
5 K% i! W: V: `1 @) w; \+ q .release = led_dev_release,& n* E) }1 P" g) F
}
9 c0 w1 \ d9 h! |' ?};0 v& a& z8 [7 `# X, U
! p# z) m5 i, L- V4 M3 \2 Z: q
static int __init led_platform_init(void). \4 `% \% n* `+ k
{
4 R- ~" D: n3 ?& I int ret;9 B: v; \1 Z$ Z3 Y) f. c- i
#if 0
7 s7 \0 [9 T$ l2 O( e& v3 G ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);) h" x. j& h0 C8 D( q2 ^- L
if (ret)
2 Q" B! W- ^) h- k, G+ q' ]& x pr_warning("da850_evm_tl_leds_init : User LED mux failed :"7 [: Y- R0 v) ^* F8 y, Y
"%d\n", ret);6 k5 L- U7 J2 `, Z% ?
#endif0 p3 ^8 Y2 X' S8 B& X" w
ret = platform_device_register(&da850_evm_tl_leds_device);
7 n1 _1 _% d0 _: U. }/ [ if (ret)- I& f7 u3 F% C% Y$ C4 I. z5 ?
pr_warning("Could not register som GPIO expander LEDS");, J/ ^' q9 {8 k2 E J( p
else& i5 |) M: f' M: r, `0 Y& V; `" y( N
printk(KERN_INFO "LED register sucessful!\n");
8 [7 l1 O# Q! K3 O; k! \9 D' d" F, s, ~
return ret;! K4 G P9 N+ |- @
}( ?( X- N; O6 {1 d
8 l! Y5 G7 z4 a/ q! U' Y4 m8 Sstatic void __exit led_platform_exit(void)
/ ~1 W4 p* u3 p+ e( G$ N( B* p{
& E, t- M9 k. e9 L8 w, P$ o platform_device_unregister(&da850_evm_tl_leds_device);
h9 @! V6 F* g) w7 ~( J4 _& ?$ v6 B) r/ r. [: U8 E5 G2 }
printk(KERN_INFO "LED unregister!\n");
+ ^ S: S0 J1 x; G; x2 s}5 e2 i% {5 x& q9 T4 J
; r" ~) i+ \2 r) @7 j
module_init(led_platform_init);- E7 {$ F. P( T/ B3 r& X
module_exit(led_platform_exit); d" g' A. }, H/ e& D
: H. D+ b, z6 {9 [- u' j: K; \) D
MODULE_DESCRIPTION("Led platform driver");
. N% L; a1 D* C F) _MODULE_AUTHOR("Tronlong");
2 v9 Q% d; F3 F0 q' \- @2 jMODULE_LICENSE("GPL");
0 w, \- q- C3 n% x4 B) `1 m+ x- c' c7 {; M3 w$ X
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