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求大神给下面的程序做注解,请稍详细些,谢谢。
4 ]8 b+ _7 H; \ b/ ]2 O#include <linux/init.h>
$ m7 J3 v! A0 ^5 d. Y' Y5 w; R#include <linux/module.h>1 {! s* `5 Y I+ R+ C ?; O/ b
#include <linux/kernel.h>
, Q8 `3 M& h, [" F% [" r; v#include <linux/types.h>
6 K2 E: T" W+ }2 i; ?#include <linux/gpio.h>
. K) e1 ]9 a* C5 I( Q#include <linux/leds.h>' d2 A1 \2 X8 k" L
#include <linux/platform_device.h>' y8 ]$ i0 H9 f
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#include <asm/mach-types.h>
! X( N u* i9 v7 \; ~5 Z( D w. y5 O#include <asm/mach/arch.h>" X1 T8 F3 i% d5 u6 ~; i
#include <mach/da8xx.h>0 d2 ~" G0 s" B$ S/ O. k
#include <mach/mux.h>
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x) _8 D8 x3 P5 z4 g9 o* ]: m, [. D8 c#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
8 Z) H: s+ m% t( i" b! j#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
% V1 W9 \" f" y" N- P* p6 n& C6 {! T#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)& `. { G8 t: Z1 Y) X* w+ K& I" v9 ?
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)6 E2 l! I3 t& ]9 }
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/* assign the tl som board LED-GPIOs*/
1 x8 j7 [. v+ g! zstatic const short da850_evm_tl_user_led_pins[] = {
- |8 G' i9 L, p) | /* These pins are definition at <mach/mux.h> file */
% R8 ~% S2 S! ^ DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
- j: o' O$ E) i+ j -1, }% V% ^* k6 X) y( j' p( b9 ~* H+ W
};3 ~' W6 R9 P! P! q/ v" u
/ N; f! ^, r. u) P( R; `- F8 nstatic struct gpio_led da850_evm_tl_leds[] = {$ |+ D) p) f: J6 @- h' \
{
) n g- a9 \6 ?2 X: n: k .active_low = 0,
: }+ ]$ X( |; W; T% I" P9 P .gpio = DA850_USER_LED0,) R) ^1 h4 q# l! W9 G7 J
.name = "user_led0",
' V7 M, \: P3 e6 o0 F .default_trigger = "default-on",
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{
5 A, s2 v- ~" ~ .active_low = 0,
' o; {; h W/ B4 ] .gpio = DA850_USER_LED1," [; a, p. T0 ?! V, z% I% a
.name = "user_led1",
' r2 L6 o5 ` Q: Y2 L7 Q .default_trigger = "default-on",
1 a# i1 n k4 G* z' D- @ },, v0 y3 ?% Q+ S( T) c |
{
0 A( x! {$ @' A d .active_low = 0,
: x9 A$ w; A0 j .gpio = DA850_USER_LED2,
0 p$ X0 Z) q7 } .name = "user_led2",
3 u; J" e' ]# f0 t$ x/ s .default_trigger = "default-on",
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{0 V5 ~- V1 j& [ o4 a
.active_low = 0,$ e5 S4 A4 x% h" B& w9 a2 g5 `4 s
.gpio = DA850_USER_LED3,; ~7 e9 R; V+ I; s6 Z2 l
.name = "user_led3",1 g* ]( A# {# U
.default_trigger = "default-on",$ O5 ]$ l( E2 F2 f# w# \2 M6 X0 Z
},, _& X1 o/ ]" O
};
+ a1 i b! `" q& }# h
+ t- E6 N8 s2 R* D. Z- ]static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
5 s0 ?5 X3 I# f$ i. \4 n$ p .leds = da850_evm_tl_leds,: x, j# p0 o# ^! N# X
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)
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};
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static struct platform_device da850_evm_tl_leds_device = {9 K @- D$ S- U4 t9 k6 X
.name = "leds-gpio",
" m- H7 I3 P3 y4 S3 p2 {5 D .id = 1,
+ i' r% J. p% A .dev = {
. z" [9 r! g0 P; o4 _" i9 x7 k .platform_data = &da850_evm_tl_leds_pdata,+ w d x$ F! h$ V$ T6 @5 ~
.release = led_dev_release,) Y) y) s+ ^7 V
}% q0 y8 H" F/ @+ I1 R4 H
};
( V3 K& F$ \2 ]4 v# H& r; ?$ C: k/ f" ^- X" _6 s( Q
static int __init led_platform_init(void)3 s6 _; q8 q- V1 [3 C/ J
{
- ~* Y% Y0 o8 T int ret;
: n# A6 l1 g- R( P6 w#if 0
6 t! k- P% Q$ T1 X. K/ g1 Q ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
+ @# C$ D k' L, l: M" @5 i9 j if (ret)
# |) E0 C/ t/ H9 ], r+ W& H$ Q pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
" L, F# i; a, a& N7 t0 {' L( d "%d\n", ret);/ C# n, W1 ^' k" i/ T
#endif
8 c6 \, L- u, H! D ret = platform_device_register(&da850_evm_tl_leds_device);
. P- [+ S7 F2 M2 i# x if (ret)
) O8 x; B. o( ]3 N# L pr_warning("Could not register som GPIO expander LEDS");
: D2 k" h$ x1 Q else
: m; `/ U2 c* R$ R9 J- v( K% j printk(KERN_INFO "LED register sucessful!\n");
# W! E$ o' P+ F6 Q" G. \: j4 z8 B
; c0 v. H. v% E. H( X P* d0 | h: m return ret;
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; N8 o4 u' Q) X- B6 vstatic void __exit led_platform_exit(void)
" ]) x* c- O0 y) J5 c, ^{
+ l6 u$ L) A: U, z2 [0 Z platform_device_unregister(&da850_evm_tl_leds_device);
8 M: e, y) }4 a0 h d
: D" O- l. [' V printk(KERN_INFO "LED unregister!\n"); ?. M9 A) U ^3 i
}
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module_init(led_platform_init);& E; ]' j$ U& d
module_exit(led_platform_exit);% v! Y+ f2 n! F
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MODULE_DESCRIPTION("Led platform driver");! F p6 a4 I1 j4 B: q2 E. K: }
MODULE_AUTHOR("Tronlong");
( `- [- O/ R3 j4 lMODULE_LICENSE("GPL");
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