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板凳
楼主 |
发表于 2018-12-14 17:29:27
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( Q" R7 F7 v0 I- n4 A3 ~- Z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:
) K* s! [1 p/ ] _#include <linux/module.h>2 Y" k0 M& g: x+ X G0 @( o* Q* G
1 _0 L+ _& M" h% L; q#include <linux/kernel.h>
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% | @4 t% K! L, {$ n7 i. n9 _#include <linux/types.h>* W" n- D, _* A" \( A$ Q
" [% |; z5 ~+ w+ P% J: U#include <linux/gpio.h>6 I! O3 y, i4 Z! c. r- u8 _
3 l" n4 H; Q2 l- k! h- q- e( {#include <linux/leds.h>& G& v; c# I1 N, P- M0 r
) n5 G( v- x' t5 |- L- w( _#include <linux/platform_device.h>
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% Q$ k5 H" t$ Q#include <asm/mach-types.h>6 n A- C2 A) b( s& u
# W. I$ |, n+ t( j' K#include <asm/mach/arch.h># H4 v& {7 l% C$ J
7 d7 @, g) _0 x5 Q8 A#include <mach/da8xx.h>7 l2 H& f7 H9 N6 `) V; n
1 v D- q: Y2 @7 ^, X0 Z9 _#include <mach/mux.h>( Y6 X- Y, x# T+ p* e
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1 ]: G; a+ C0 m2 @/ h. Y i#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)# V$ \1 \& h7 @( N* D; U
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)( ^' N+ l6 ~5 w) l! r
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)5 \2 n8 q6 [- H! k, C. {: w$ E) g
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)* ^6 {4 O+ h; D+ Z3 s$ \% p
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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5 Y- w3 s) Z6 {* T2 j8 D9 r/* assign the tl som board LED-GPIOs*/ A0 ^, @0 e1 d, Z" f
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static const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,4 N; {& J0 {8 D) W. S/ G
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static struct gpio_led da850_evm_tl_leds[] = {
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{
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- \" z& `1 [! R6 U, A5 k$ t .active_low = 0,6 b8 J- P: F/ ~* A$ V0 P! n
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.gpio = DA850_USER_LED0,, G6 h6 N+ n. D8 N
$ @; Y) B" F g3 S! q .name = "user_led0",! a7 U- o% p4 r/ G7 o' g+ Y
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.default_trigger = "default-on",) y' q! }1 W% z9 j
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.active_low = 0,# ?! C. I7 Q2 Z
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.gpio = DA850_USER_LED1,
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.name = "user_led1",
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" F4 H# K/ R% A- D, ~* j9 H& m# O9 z .default_trigger = "default-on",6 `8 @. n2 H' b. j6 P; _
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' r! e% _( r: a' m# H* c .active_low = 0,
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% E$ Z9 ]/ |& F- } .gpio = DA850_USER_LED2,
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9 s; q8 c+ F2 \7 i9 p$ H( C .name = "user_led2",/ u' l. g; X+ _* q8 H
& c4 S6 [& @& a/ `% F" l .default_trigger = "default-on",6 H1 l4 c; |! C9 L# R3 X
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.active_low = 0,
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+ v2 `) [7 o8 }2 s( J8 P .gpio = DA850_USER_LED3,1 l, p/ o) i! {2 `
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.name = "user_led3",8 b4 W7 g! R) c; k. O
2 K* O% ~5 R# E$ t" ]; V/ O6 u9 t .default_trigger = "default-on",; b( c. W, x2 { J
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.active_low = 0,
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.gpio = DA850_USER_LED4,
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.name = "user_led4",
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3 H! i _# z Z4 m+ Z .default_trigger = "default-on",
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},
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6 X% s% e: P7 g8 f' m3 ? G {
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.active_low = 0,
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, _' s: @- U/ C& q .gpio = DA850_USER_LED5,
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.name = "user_led5",
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2 ?# M- E) d; a% I( P2 b .default_trigger = "default-on",0 \! I @4 j- F. s4 Q2 N
, x7 S- W: ~& q! n# v+ G },
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};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {# A) ?4 N4 M: r% x# j! Q' w% S
* B# K! Z. l; W: R) [( v .leds = da850_evm_tl_leds,
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: d# o' p" ], Z$ z4 h3 a, u .num_leds = ARRAY_SIZE(da850_evm_tl_leds),4 q( y8 ]5 [+ I
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};
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9 u6 a* l; h/ ~, W0 i) e& _5 _static void led_dev_release(struct device *dev)5 c* ]# H6 e2 K5 h4 t/ Z9 K1 G$ B$ f
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' w8 |( @) w! E/ P: Z0 mstatic struct platform_device da850_evm_tl_leds_device = {9 H0 ^1 X: A: i
. }3 P' w) O1 W .name = "leds-gpio",
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7 h7 h: N, X- p! R& p w' x8 v$ ^% P .id = 1,) y% ^& \& @6 ]5 B. I2 H' [
1 r7 ^6 p+ R- O. S, S! U .dev = {
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" R" \. {1 b- X, Y3 h2 B% O% p .platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,& G# b7 L; W/ c, L5 V
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};, p8 d: o# b8 X, d4 K' z& }
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( J" C. I( d p( V+ `& v; nstatic int __init led_platform_init(void)
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: N8 [9 q% Q+ X3 S. u t int ret;& f# f" x! q- `) ~
& {% m$ ?9 \- W7 z+ y#if 0! D+ O+ {) g: b. I! j6 E
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);+ g5 b' g }! S1 }3 t
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if (ret)
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5 J, [8 ~. A! c b pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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3 z O, S$ j; ]# G' v "%d\n", ret);
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4 i! D, q) [. R8 m( {#endif
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1 U; Q, B9 P" T4 ?9 U, @- { ret = platform_device_register(&da850_evm_tl_leds_device);" V, t% c- Q0 I6 b; I! U
& M% L# e; r3 X- r# e. d2 ~ if (ret)2 {: Y( d% a& S1 v2 m
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pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");* H; H" m3 E2 R% c, V- G9 x
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return ret;# G* k# C. p' j2 w% I3 U, E
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' C5 ^! ?$ N' D4 [& b9 d2 zstatic void __exit led_platform_exit(void)
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/ t6 A" _5 D5 z2 S% A1 g platform_device_unregister(&da850_evm_tl_leds_device);
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printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);, @. n( @ _" \9 Y/ F7 `
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module_exit(led_platform_exit);7 N9 ^7 C: r: O+ O5 h, m5 B: }
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MODULE_DESCRIPTION("Led platform driver");, A' \( J0 J3 z: w, t. j+ W6 t3 c
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MODULE_AUTHOR("Tronlong");
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% e9 ^% w- X# PMODULE_LICENSE("GPL"); |
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