|
|
求大神给下面的程序做注解,请稍详细些,谢谢。8 B. {9 }& k9 K/ I) k
#include <linux/init.h>
$ R! v0 }* Y: q& a; ]5 D: I#include <linux/module.h>
) N) a' f" N7 ?7 h#include <linux/kernel.h>( G, H1 w' t' n$ [+ ]
#include <linux/types.h>
) U* a1 y( q5 d+ O1 M#include <linux/gpio.h>
- U7 _4 B$ i! g1 n% O8 m0 V#include <linux/leds.h>
/ }' V5 P" c6 k5 e0 P#include <linux/platform_device.h>
" C7 h5 P" C' a4 B1 r, }- I& ~
" B3 P$ `) h$ I) `& n6 h#include <asm/mach-types.h>$ H& t s' C- Z5 H1 L/ q
#include <asm/mach/arch.h>
& t% E/ Q8 N& O: z9 G* y#include <mach/da8xx.h>
. R6 e. t& ?- |2 c5 T5 x0 {; J#include <mach/mux.h>. {! Y6 ^2 _# [4 V( O1 L
( _0 p. V v' s$ J# G+ `
#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)4 M# Y% r6 F& o
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
8 B, y# p5 o {( H" ?, ]#define DA850_USER_LED2 GPIO_TO_PIN(0, 1) f: h6 |( X- V, L" g* h/ T1 K
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2): ~( Q0 x! {9 }9 L2 X+ g
' i& f4 r3 j" p! {8 Z% n4 V( C
/* assign the tl som board LED-GPIOs*/ z$ B7 V& ^- v, Q7 a% V
static const short da850_evm_tl_user_led_pins[] = {
5 B! @+ x6 f; h3 n4 ^. _! ] /* These pins are definition at <mach/mux.h> file */
$ {0 F' u) p+ a0 \) w$ M DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,( O' I8 n1 b3 ]1 T: l6 N
-1. x2 v1 D( L1 i. L+ L
};' {$ w- @& B$ h2 Y
& ~4 |* b4 u" O+ k4 N1 Ostatic struct gpio_led da850_evm_tl_leds[] = {' J1 _: V `6 I& a% D" i# _
{! m. N$ v* x8 O0 N( ^/ N
.active_low = 0,2 b, ?) u- p3 p2 [
.gpio = DA850_USER_LED0,4 A9 k3 @3 n& G3 d! t+ p7 Q5 ]
.name = "user_led0",
/ }8 V/ g2 a3 P& ^" }, L .default_trigger = "default-on",
$ }6 y; P) [6 t# }- W' l },
# [# G' ?! S+ t1 j5 ]5 u {! G) d$ X$ E* Q: T( s
.active_low = 0,
( z+ L' p1 J9 U& G! M0 e3 ? .gpio = DA850_USER_LED1,
( n: d. m6 ?* T: |0 Z .name = "user_led1",
% Z4 T6 G! A) O .default_trigger = "default-on",( j- U: J& T$ l$ u
},
% W# ^: X$ \1 } {
2 v& N9 J; j3 e' d; Q' H Q .active_low = 0,
$ h- n. e, {3 O; D: T7 A .gpio = DA850_USER_LED2,
" q& r/ u" e. h" |- k; \+ O2 c .name = "user_led2",
5 E& Z; H0 P- q9 S& j+ o .default_trigger = "default-on",# O. h" ]1 j4 ]
},
; b# i- P1 M8 D' C% y) `5 B {
3 `2 q: T6 L+ \ .active_low = 0,; \9 P& k' y6 p- y' F# ]
.gpio = DA850_USER_LED3,, _, A" M. E7 e
.name = "user_led3",
; R8 u: t5 X, y .default_trigger = "default-on",
; y# }* E) M1 n: c },3 |* c% Y* E$ c+ \3 O
};
; p# g% i: s6 t8 n5 r0 a* C- U! U7 h8 d2 ?0 `( a- P
static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
5 A/ o) K$ T3 A' ? .leds = da850_evm_tl_leds,
& l; m, \7 y0 o7 | .num_leds = ARRAY_SIZE(da850_evm_tl_leds),+ m' B, p% ]7 `2 q
};( m2 i$ G, M, e4 R
4 V; ]. ]$ _- P1 r! E r' M: z6 bstatic void led_dev_release(struct device *dev)0 T+ J* c. \8 M( t
{+ P b$ |" f( G* S i
};% h6 i8 o1 m, o+ C$ [9 G
7 m& M! _6 g( g& d5 s
static struct platform_device da850_evm_tl_leds_device = {
2 D1 Q- m, d- Q' a4 z+ }8 Q0 E .name = "leds-gpio",
$ D [7 `/ p2 a( } W0 T) J .id = 1,
) [/ J/ M0 ?0 d/ W$ H0 u .dev = {" s& e8 ?% n' p% {
.platform_data = &da850_evm_tl_leds_pdata,
1 K6 u: d% ]& q5 G7 h7 _% b .release = led_dev_release,; C; ^# U& v8 O4 h
}
: |# }3 I$ G+ L0 y( w- }$ [1 b- a};( t* p' \2 j; @
" ]% h% \1 m+ A+ ~
static int __init led_platform_init(void)1 p$ J% I7 J& G- C
{
6 X4 [) C* s& E7 K6 _+ _: R int ret;. V; k! C- p7 f, Y
#if 0
, A$ n7 @, B. E. I7 G4 W0 G2 [ ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);" V) ], i0 C7 l. _# o
if (ret), V& N8 h% _. X& A: q, _+ [3 [* e
pr_warning("da850_evm_tl_leds_init : User LED mux failed :" ^( D, O0 A) Q6 Y
"%d\n", ret);# r; r9 m+ ?" U, j
#endif
( s; Z1 c* [- X! _6 w# B# O& c6 { ret = platform_device_register(&da850_evm_tl_leds_device);: v y; c* u8 Z6 K& p7 I
if (ret)
. D6 A, ]% F Q0 q9 ^+ b pr_warning("Could not register som GPIO expander LEDS");
5 {: f' L& i+ m5 q9 d3 Q4 T# ^ else
1 ?1 I+ [9 C" x! m( N3 z printk(KERN_INFO "LED register sucessful!\n");
; O$ S0 g. Q* h g! l0 D6 {6 v5 f& _: X% Q! H7 K+ Z( N/ i
return ret;
8 v3 N8 ?& U' z7 d( M}1 E/ } K& C" G8 |
: K4 g6 a9 j& Y3 m" G
static void __exit led_platform_exit(void)
5 N! i A1 U, i1 r$ J{& g6 Y. h4 |/ B/ t7 V
platform_device_unregister(&da850_evm_tl_leds_device);2 B: q8 Q' Q2 @, {, H. _# }
0 `. X2 E. Q7 Q q6 j; h p printk(KERN_INFO "LED unregister!\n");
% [* W" A6 j5 S4 Q5 _$ \" s}
5 N0 C- }* g. q6 Q- m4 h' x6 {7 ^0 b. {9 F
module_init(led_platform_init);
, t+ ?2 g0 X$ M2 u, P1 ]. Mmodule_exit(led_platform_exit);
4 ?0 E9 g8 @" z# v
+ q$ L. S( T; f4 e, O. V$ y; NMODULE_DESCRIPTION("Led platform driver");) B+ n9 X9 @- ]5 \) M/ u8 k
MODULE_AUTHOR("Tronlong");
2 X5 B Q) U$ u: i9 fMODULE_LICENSE("GPL");0 Z# n9 s( Z5 r1 b+ K
& z1 @+ u$ f7 Z, F) r9 J+ b
|
|