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求大神给下面的程序做注解,请稍详细些,谢谢。
6 L# Q4 n/ c2 C# v#include <linux/init.h>
, k3 ]) N* B% c- H0 k1 \#include <linux/module.h>
5 g! P* s a- B8 e- N#include <linux/kernel.h>0 Y0 g: ~( d& _& O! E! q% z
#include <linux/types.h>* Y3 v, I3 X0 @' R" b% j
#include <linux/gpio.h>% m# ~; c+ \( A+ d: n$ X1 M
#include <linux/leds.h>
& q$ p1 r3 H6 ~#include <linux/platform_device.h>
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) t0 N7 U! N3 v/ c#include <asm/mach-types.h>9 {' F, k& t# e* G
#include <asm/mach/arch.h>! G& ^, t8 q" t( b! z5 P) ^. m" H
#include <mach/da8xx.h>
! S @. W/ e, A: `/ ?/ p1 m#include <mach/mux.h>8 A. L, n2 O! f0 r
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
5 T8 o' b* ~( O% v& c: k3 Z, F2 j+ N#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)9 m, b# b# Z3 L8 ^8 x
#define DA850_USER_LED2 GPIO_TO_PIN(0, 1); t6 T" C `( _7 ~2 ^! c( n: U, X
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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: C s5 u7 x; ]- M9 z9 W8 h( T {4 V/* assign the tl som board LED-GPIOs*/2 ], A+ D1 o5 P' a9 Z2 ~+ ~
static const short da850_evm_tl_user_led_pins[] = {6 Z) b* p, z- m+ K0 E
/* These pins are definition at <mach/mux.h> file */
' c0 A i! F f: T( Y9 Z DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,, I& a, l* O5 @) A
-1' n' m# h, ?& H5 K1 m! f# Y
};9 `( _0 y! M( [3 x$ p! e5 B1 H# N! a0 r
M6 R3 j8 G' I
static struct gpio_led da850_evm_tl_leds[] = {! Y8 |8 [, |2 E8 H6 t0 v0 R4 D
{" E$ A: \: z' c. G, U9 o
.active_low = 0,
1 W3 V. V/ |8 I y; s' } .gpio = DA850_USER_LED0,0 L* T/ ?! y2 ~
.name = "user_led0",
" E9 K m* c# G4 M0 B# t. R .default_trigger = "default-on",* z7 `9 a% U5 D1 R
},
' x5 T& A5 ]4 X. ]# O2 \3 w {: L4 Z9 \' J! G0 o8 b4 P
.active_low = 0,
+ f6 N( q+ r2 l5 @1 R5 k8 Z .gpio = DA850_USER_LED1,/ E, `( V/ v$ Q3 `5 p1 G0 c' u
.name = "user_led1",8 _! \# D4 G; i" `: [6 z
.default_trigger = "default-on",. O% A/ e% l1 R' P) s
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{1 g1 }3 E8 j9 g
.active_low = 0,# s4 S- E) A6 D
.gpio = DA850_USER_LED2,3 C E' J3 e! b# O: ~# D# w
.name = "user_led2",5 F' M- ^7 n4 a
.default_trigger = "default-on",, r# U6 J; T! a1 m o
},
5 y; ~9 n- |! s' o/ O& ^ {' q9 Q* ~; L1 f7 K6 L; O" {
.active_low = 0,! l; \+ C6 n! z9 M9 C
.gpio = DA850_USER_LED3,
. S7 w2 \' f8 w .name = "user_led3",
, k5 @! R( I/ H) m/ h0 P, F .default_trigger = "default-on",
0 o: x2 |* h$ A' Z },; k1 r0 e5 M. C3 U! I; C
};( l# v, _9 a( ^+ v% t: M& v, T
& `, J. H0 N7 R' B K( u9 Y' B
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {+ u* G. o$ O8 |; c
.leds = da850_evm_tl_leds,2 _8 H7 @6 A Q0 `- n/ g
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),3 C) D' C3 ]# y
};6 O! G% u8 k7 T' O- ]* Z9 o+ F
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static void led_dev_release(struct device *dev)' @6 _, s4 [2 H
{
1 B8 l5 o v/ z3 \+ y};" Q2 H8 i+ E3 @6 B1 P8 x
- @# ? P- G6 B# U! Istatic struct platform_device da850_evm_tl_leds_device = {
7 A) E; Z- w/ A* q .name = "leds-gpio",
2 C0 x* g7 W6 Z* T$ ~ .id = 1,
2 {9 Y8 B6 W5 d; }& q .dev = {2 ]3 _* i& G# _3 N: D9 F; V! F- e
.platform_data = &da850_evm_tl_leds_pdata,
2 {! Q8 N, Q5 O .release = led_dev_release,
# o/ f- C: n9 ^" g3 j% A# p. X }
4 q" G' m7 }% I* s+ m};$ A/ n& c2 j5 K2 t
3 _& { T, m) A7 b
static int __init led_platform_init(void)8 { O! S5 x- L! [" \$ K! i+ x, c
{
: {' \5 p9 A$ S9 M+ j& O: d, s int ret;
d- T$ x: k% r4 `#if 0. E$ w" X, n6 i- }# Y
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);! }" p4 }/ |7 e$ k7 b
if (ret)
6 `, y2 Q7 d0 \' f$ s1 v pr_warning("da850_evm_tl_leds_init : User LED mux failed :"7 j1 R4 I7 a, h3 U$ f% \* ?4 ~
"%d\n", ret);0 i) ~+ e* E3 @4 W( |) f( Y4 Y% q* K* d
#endif4 v% v1 h0 ]- U, p$ u, y; T* S6 ~
ret = platform_device_register(&da850_evm_tl_leds_device);2 }5 L- C. f5 J* G# Q, n
if (ret)
f) u* v# q( X7 L6 n X pr_warning("Could not register som GPIO expander LEDS");3 M1 R& o) f* T. o: R. H
else0 ^1 f4 k( E" U O
printk(KERN_INFO "LED register sucessful!\n");
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return ret;
& z! G' ?7 w: {}
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N5 i, h' V6 N. X# Lstatic void __exit led_platform_exit(void), K4 M9 K+ B2 k. N/ O% j' F) E: A
{
+ X! Y9 w2 l7 X; Z1 q; j platform_device_unregister(&da850_evm_tl_leds_device); I1 u1 K7 G4 B( D: v6 } g
6 t4 x5 Y$ D0 D L3 | printk(KERN_INFO "LED unregister!\n");
5 q, ~; |" ]3 A q0 Z& y4 e8 f}( f( _, s7 R( A$ T& E
/ z% k$ g: u) t* z. A. Q. ?module_init(led_platform_init);
) X1 K& J) o* O4 Pmodule_exit(led_platform_exit); z% A5 j; g$ z4 S" ^8 E
$ n) B, K0 n, N. c" `" ~1 M7 [; @
MODULE_DESCRIPTION("Led platform driver");* w2 u: J4 }0 ?
MODULE_AUTHOR("Tronlong");
$ X s" j y: H. D3 M8 q$ yMODULE_LICENSE("GPL");
8 x0 n" k. e$ I& {) w# b: k, M3 A" G% Z& t9 \1 Z
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