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板凳

楼主 |
发表于 2018-12-14 17:29:27
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我倒是知道需要编写驱动,主要问题还是地址的映射问题,就是在驱动里面如何来实现地址的调用,我看你们的LED驱动程序里面也没有相关的地址调用问题啊,如下列的你们提供的源码所示:
5 N0 I. {2 w- N: a% _' w#include <linux/module.h>
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+ E- u1 H2 c( p. I#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/gpio.h>& R' S# w. G* l/ q( ~ `& X9 r
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#include <linux/leds.h>
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#include <linux/platform_device.h>6 _' u# x, M5 k8 P4 D& G! B
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#include <asm/mach-types.h> |5 m* m7 Q6 a4 x. E) m2 s5 @ O- u
% w' @$ u$ ] s& Q3 A( N#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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#include <mach/mux.h>
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5 ]! O' t, r# |+ j* f1 o. t3 b- w#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)5 T' {5 u# o" a& A! e2 b
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2); O5 s- {- j6 `: {& L, Y
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)4 `1 Q/ p+ N7 c) m8 N$ X) s2 ?) x& m
" x' x# Y1 v O; c/ U#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/
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- X. K( ^6 P2 c" T/ E# \* e' e8 Nstatic const short da850_evm_tl_user_led_pins[] = {7 m q: h, @$ B1 N
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/* These pins are definition at <mach/mux.h> file */& C6 e4 w. H* u" p' k
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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};
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static struct gpio_led da850_evm_tl_leds[] = {
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{
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.active_low = 0,- C8 W1 U% G: G9 A* T0 e, x
" b/ m+ P% I H! p3 ` .gpio = DA850_USER_LED0,5 x8 T6 K; f# P
+ u7 l/ Z1 U7 Q J- T, c .name = "user_led0",
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.default_trigger = "default-on",; S! L) S, H' k6 X3 \# M0 W
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* U) q% P+ _$ R: y+ h .active_low = 0,
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/ @5 x3 }, b/ `# j& } .gpio = DA850_USER_LED1,
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.name = "user_led1",$ }9 d, J* U0 \* \3 X
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.default_trigger = "default-on",9 f3 C3 u* v1 {' M, U0 E
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{
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.active_low = 0,0 v5 E! c ~! \
# h: K% u$ ~+ s7 w0 w! ^9 r& n .gpio = DA850_USER_LED2,
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) [/ u1 D; i3 {: w .name = "user_led2",
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8 y% y: d% h- @3 n .default_trigger = "default-on",
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},
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{
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.active_low = 0,* `; X2 E* ]) C0 J# L
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.gpio = DA850_USER_LED3,
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" \+ T$ c0 O& b .name = "user_led3",
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.default_trigger = "default-on",
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.active_low = 0,$ u/ V% f' x& \1 J# t: z- }3 |5 K
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.gpio = DA850_USER_LED4,' M2 g3 j2 z0 i$ Q
{- F0 H# q6 {8 e( O .name = "user_led4",
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.default_trigger = "default-on"," ]. Z. Q1 L; n! q! ^6 R; [6 z% e
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{
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.active_low = 0,% ?. T9 l. O. k' Q
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.gpio = DA850_USER_LED5,+ @" D; f1 Z& k! z
2 m" D! D) q. T# u* k# p .name = "user_led5",
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.default_trigger = "default-on",
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+ E1 x Z! p4 g1 R% ^static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {5 i7 Q: r# H! S; y t2 |
a3 y) Q& d0 u6 U# [ .leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),/ T# O: a1 m* F- v) `/ _- l
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$ c0 S# q, x' f$ tstatic void led_dev_release(struct device *dev)) F0 L% k8 f# F# I8 [
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; j# h, T! R% Gstatic struct platform_device da850_evm_tl_leds_device = {- k+ f8 l7 I& s3 [0 I% B
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.name = "leds-gpio",
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.id = 1,
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+ n# _( H: g. k .dev = { L1 w _8 ]7 ~6 a. D
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.platform_data = &da850_evm_tl_leds_pdata,; Y! n+ A6 H+ l# T" Q
6 i( N$ `: k! n+ ^( p* B- A3 A .release = led_dev_release,, E+ u7 {' W4 o% c) I
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/ m4 V- ^9 f% W/ W4 }* E) B' ?$ j/ m};
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static int __init led_platform_init(void)
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) @* B+ m+ F2 k& u int ret;
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' p+ o6 ~& n' X, y* L#if 0
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4 u; Y1 A; i8 U+ n ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)+ ]5 [: m0 O h) x
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :": y. r2 V. q4 P0 N8 N9 { l/ C
; }3 l0 l D! V7 s* m [9 @+ z( m7 t l "%d\n", ret);
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: y- Z0 A7 u$ A* o3 T* p#endif
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ret = platform_device_register(&da850_evm_tl_leds_device);: U" C5 v6 S/ c2 [" P
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if (ret)
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pr_warning("Could not register som GPIO expander LEDS");
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else
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printk(KERN_INFO "LED register sucessful!\n");$ e z( }, S; T0 c
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2 z1 h: G# p/ F) f( U' Z$ z return ret;( U9 T, o) q& m% H' K( }. j
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- j3 A, e- e @static void __exit led_platform_exit(void) E* N3 s! }* ~3 L0 \. q
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{
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platform_device_unregister(&da850_evm_tl_leds_device);: k3 Z5 \4 w: R6 L5 o
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" x, T( [5 ]% K; J4 _- s printk(KERN_INFO "LED unregister!\n"); ^" w. B* t" p; H1 x4 U) L- w% O
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module_init(led_platform_init);; s5 ~% X" J% Q; t; _% H
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module_exit(led_platform_exit);
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' j4 N/ L' a. c" W6 D" T) P. l% BMODULE_DESCRIPTION("Led platform driver");) O; F: l# T( G
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MODULE_AUTHOR("Tronlong");
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3 F4 c* q# |! T M1 v7 MMODULE_LICENSE("GPL"); |
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