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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:
# @! h8 s# J4 Z* q* P; d#include <linux/module.h>* n y1 L7 s+ j
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#include <linux/kernel.h>
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#include <linux/types.h>; ]$ b; |' [! k" i: @, P7 B
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#include <linux/gpio.h>& T8 F( t, d; v
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#include <linux/leds.h># P+ w m) t x. q* m
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#include <linux/platform_device.h>9 g, |( a5 }& q( b, Z- j
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>6 ?" |: D+ y; W6 O l) q1 r N
x% x, j7 o! s8 c#include <mach/da8xx.h>
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#include <mach/mux.h>
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1 j2 T- s" Y& e2 `: ~) f- a#define DA850_USER_LED0 GPIO_TO_PIN(0, 0). s; ?; q( \) F4 _
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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)9 r% r& _. g; c3 b
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/# u* [& S: f) d( U0 g# n! J
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static const short da850_evm_tl_user_led_pins[] = {3 _2 {3 V. r( m. D2 i' m$ a
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/* These pins are definition at <mach/mux.h> file */
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- j2 ]) X {* z" D6 @. |3 b8 J) \- L 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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" p4 G' ]# ~$ G% bstatic struct gpio_led da850_evm_tl_leds[] = {1 q9 ]! @1 U( F% [$ v' z& j- ~
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{
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1 W. _( g7 P6 g J! Z' L2 g .active_low = 0,
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+ j$ h: Q! ?$ _* n .gpio = DA850_USER_LED0,4 j; V* \( N4 F5 G6 ?
2 z! X) L: T$ F% i7 y( W+ u+ } .name = "user_led0",% z+ V$ T) q( `" B& r8 W
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.default_trigger = "default-on",
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.active_low = 0,7 e9 Q. |* J+ N, B5 a2 o" P- O
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.gpio = DA850_USER_LED1,
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.name = "user_led1",2 `3 r2 y0 W% D% ?- d6 o
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.default_trigger = "default-on",* H2 e6 L/ c8 M6 V# H
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+ g# Q+ W( f3 [ .active_low = 0,
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.gpio = DA850_USER_LED2,
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4 O9 m8 p, h6 x0 K/ ~ .name = "user_led2",3 \' |: S- J5 A/ T: I" M
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.default_trigger = "default-on",6 L8 z( _7 G; V2 j1 ]% Z6 q7 A
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},
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.active_low = 0,
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( v9 i, y! ]: M" m .gpio = DA850_USER_LED3,
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4 N! |$ v" E) O$ _3 h+ \4 l .name = "user_led3",$ ~) q6 }2 Q) u E0 U1 q I# m. e h
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.default_trigger = "default-on",
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.active_low = 0,
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; w) a! U7 O/ c+ D1 Y. j .gpio = DA850_USER_LED4,- ^% U0 l2 T; Y( a" s- w
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.name = "user_led4",
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* x, Z. n% {7 h$ H+ U1 ]7 f .default_trigger = "default-on"," C# F$ o" e" e' j! a% c
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{
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+ j& j1 I5 m W& V6 E .active_low = 0,/ f7 M$ |5 O5 }
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.gpio = DA850_USER_LED5,* y# h; c- e1 y! q7 f `" P
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.name = "user_led5",
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.default_trigger = "default-on",
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+ V6 N; W7 [! q* B# H# u9 t6 z% Y8 Z};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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( Z5 t/ M* ?5 f# C .leds = da850_evm_tl_leds,
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) i/ p5 n$ ]" C' Y4 P .num_leds = ARRAY_SIZE(da850_evm_tl_leds),! c; |) }, n, T: s J
: g e+ t2 U) U7 s};
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static void led_dev_release(struct device *dev), b0 ], y% H* _* K, X
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0 ]; T; h% p0 G+ p$ ^static struct platform_device da850_evm_tl_leds_device = {- a* ]; t: c, h$ r( [
5 V( x; r4 h- [7 f .name = "leds-gpio",
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( v2 _, k y; F% Z* h .id = 1,
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.dev = {
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.platform_data = &da850_evm_tl_leds_pdata,% k* `; o; ]3 j6 R2 v4 J2 S2 ]1 {
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.release = led_dev_release,) V4 H( t# M- v, r# h i$ p
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) q5 u# o* o3 F1 h+ Tstatic int __init led_platform_init(void)
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int ret;& n- i( J& H3 \9 t! R
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#if 0) C$ h+ W( F. S' |, K; W
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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1 e+ ^) ~: |( W1 x ]7 O! K$ a pr_warning("da850_evm_tl_leds_init : User LED mux failed :"5 L$ k$ F8 Y2 i; B4 z
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"%d\n", ret);# g; W6 A' f% J& j; d# [8 [4 S5 i
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#endif8 |$ ]0 r2 b" A; m" t% o7 L
% o' z" @3 n. ^1 a0 m0 _ ret = platform_device_register(&da850_evm_tl_leds_device);' s8 \1 U- b4 D, \7 C. ]
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pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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}
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+ [/ ?6 t' u' Y8 a$ nstatic void __exit led_platform_exit(void)% B7 R6 }5 f" j& J$ E, V3 N, d
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{
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; g$ K* a1 d- y0 n) X& \' j5 | platform_device_unregister(&da850_evm_tl_leds_device);8 X* d$ w p/ N# N8 j
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8 t/ ^' j, \8 |( J$ D2 z) ] printk(KERN_INFO "LED unregister!\n");' M2 d* {' h& n0 C* n4 R
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module_init(led_platform_init);* } i u* D0 \8 g2 [- L E; r
# s0 o; n, F6 B7 p+ Rmodule_exit(led_platform_exit);! a8 b1 b* K2 n8 y
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MODULE_DESCRIPTION("Led platform driver");9 t9 x; `% i; P: U. O$ P6 p, A+ J/ p
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MODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL"); |
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