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板凳
楼主 |
发表于 2018-12-14 17:29:27
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只看该作者
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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:
, P) {4 n" x# y, D8 V% j#include <linux/module.h>
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#include <linux/kernel.h>
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1 G- q# W, t' e; f3 B- v1 U2 W0 R#include <linux/types.h>
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i7 c( ]0 D, e2 z#include <linux/gpio.h>
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. X5 s5 I7 O+ |" F$ O" _#include <linux/leds.h>
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/ A1 e8 x0 {" o; G5 d#include <linux/platform_device.h>2 A( j% d% H4 t; [3 N" R
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#include <asm/mach-types.h>5 R& r8 g7 }# n3 o( @
: e. a* p, {) N1 v# X#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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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)3 e- C5 H Q/ L2 B* e8 a
& u( d; m* b' I; m+ u" q; d; @#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)' x, G `0 o. d$ g
2 P: B1 x. v, ]% N#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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$ \* U6 O& L, }, v#define DA850_USER_LED4 GPIO_TO_PIN(6,12)5 e, w' q; ~& I" Z+ e1 q
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)/ {1 H. h. L$ x7 F% M3 N7 A) D) D; H
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7 ]% o( i q {/* assign the tl som board LED-GPIOs*/7 E0 H7 |2 p/ ~5 ]* e
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static const short da850_evm_tl_user_led_pins[] = {. ~& g4 J2 J" U( t
. I' s! u! m# T7 h# ] /* These pins are definition at <mach/mux.h> file */9 h' r7 P- O6 N( s1 e
/ ]/ F3 S; o) y+ c. S/ V8 h1 r DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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-1
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static struct gpio_led da850_evm_tl_leds[] = {; ^" g) J6 |2 P& \- ]
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{
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% z% }/ a, l8 G, }. N6 R .active_low = 0,
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5 u- E3 N! ?4 @7 z3 Q6 \4 M .gpio = DA850_USER_LED0,
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.name = "user_led0",
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.default_trigger = "default-on",( w1 h* @8 d) }* m6 J' F" g. Z. S A
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.active_low = 0," f9 S; Y e: M& h3 X5 l
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.gpio = DA850_USER_LED1,: x& ? g- ?" T5 F7 W
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.name = "user_led1",
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.default_trigger = "default-on",& \+ Y3 c- v O3 X
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},
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.active_low = 0,( U' K5 J0 R. m: q. f" N
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.gpio = DA850_USER_LED2,5 B1 I% s& e# Q6 {+ V' o
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.name = "user_led2",
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.default_trigger = "default-on",
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{
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, @$ L3 H- }3 _, r6 C .active_low = 0,9 d2 p1 z$ d- l6 X5 Q& c3 ?
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.gpio = DA850_USER_LED3,: P" i2 I: n3 g/ I0 I6 I
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.name = "user_led3",+ w& o T& I7 A$ n" ^2 m
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.default_trigger = "default-on",
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{
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* {5 ] y+ L6 b9 C- C& k# a$ y) r .active_low = 0,
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.gpio = DA850_USER_LED4,
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.name = "user_led4",
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: P" s0 @6 K6 E .default_trigger = "default-on",
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},
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.active_low = 0,
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.gpio = DA850_USER_LED5,* `% q8 {5 i. `, h
9 A2 C3 K, a% z* ]' k .name = "user_led5",, v A/ ~2 k7 ]! \3 \
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},
r" ?! ]$ b( U( A; c, {
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {+ D, @, ]9 x- x, _7 L
( b) V! `( g% i" r- U- S1 r .leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds), y2 X5 \* h2 T3 }- {0 U
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4 J! ~. G6 [) b9 \; ` n& y: Mstatic void led_dev_release(struct device *dev)
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{
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5 E, N+ Z" r7 S$ O# R9 o7 Y" Mstatic struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",. Q5 J& W0 D2 C0 [5 z6 s8 t
8 u3 `5 c3 m% _# C( } .id = 1,6 X' Y, P# H4 N6 K5 l. l" e
) S+ {& P1 v0 ]- t. q; z .dev = {
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.platform_data = &da850_evm_tl_leds_pdata,( N* l4 @: X: P7 m0 f' {/ Z
3 Z8 s5 _. Q" P3 v8 i6 z .release = led_dev_release,* i7 ?) y+ G }( J3 e; L) S( K
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}
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! Y) Q3 B0 c" L};
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static int __init led_platform_init(void)' g' n1 `; K7 X) b
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{
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8 C7 w' Z* t+ ?; X" V- Z/ G$ j j int ret;
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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0 G% v. o- a7 I if (ret)* t2 ~" E: j8 [9 t& e' U
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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6 S7 `/ r& j* X B; L8 n0 f- ~- g9 } "%d\n", ret);
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#endif3 V( M/ @5 R& ~; h- H! L. L
5 n% J! W5 C# [" ] ret = platform_device_register(&da850_evm_tl_leds_device);
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! `' e; P+ d- j+ d if (ret)
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pr_warning("Could not register som GPIO expander LEDS");" Y' }; e& f& y/ j2 y+ q
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else
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# X, r& {! _7 B2 \! p: N1 @ printk(KERN_INFO "LED register sucessful!\n");! J$ q: Z8 l ~6 M6 e
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+ X& R0 q$ D$ m% J! u* f return ret;
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}
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5 Z l6 R- c' @6 m" \6 T2 \) Y/ o! istatic void __exit led_platform_exit(void)8 n# `; p! M3 v/ G
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platform_device_unregister(&da850_evm_tl_leds_device);
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7 Y7 F# [; q, | printk(KERN_INFO "LED unregister!\n");
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0 f8 S. d" }2 G L" o0 {, ^module_init(led_platform_init);
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module_exit(led_platform_exit);
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: t* a4 [# L: o4 m. j5 _MODULE_DESCRIPTION("Led platform driver");# S7 q9 p" g) P1 h5 h/ L
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MODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL"); |
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