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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:# L. J0 f5 V5 S3 \
#include <linux/module.h>
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#include <linux/kernel.h>3 G! P: @9 @, A$ w a' n! r
( Z2 j4 P2 Q; V" D* U: {8 o#include <linux/types.h>. k' m" ]' \" I/ d5 _$ K
7 |2 A$ Y' m& c$ ~% V0 u/ n0 }#include <linux/gpio.h>; y8 z, H; a1 ~" D/ \
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#include <linux/leds.h>% C% X+ p; H5 l
' ~) G! r- Q3 T#include <linux/platform_device.h># x) q1 q: i' x9 D9 Y$ |
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Y$ `2 D* H# \/ [4 F! d* O- X#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <mach/da8xx.h>3 k# w( v8 f7 g/ {4 x7 n
+ d. C2 g% D3 p1 O: ~' {0 S1 X#include <mach/mux.h>
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% w$ t/ |) w0 q: Z& [% ]5 u! u' N0 g#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)' _+ P; H: ^, v; L
0 f3 [- S! v- ~( r$ J9 b( @* P1 S0 m3 w#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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* Q4 J7 k( O9 G" i# m/ P#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)& f. V' N, u4 Z
2 d" J q$ l$ t' l0 L#define DA850_USER_LED5 GPIO_TO_PIN(6,13)6 v. t( ~. I5 |7 j- W! f
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/* assign the tl som board LED-GPIOs*/
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static const short da850_evm_tl_user_led_pins[] = {- a, [& T) n' P, l1 V G$ k1 w
" N h; y5 j y4 _2 A /* These pins are definition at <mach/mux.h> file */; u+ n0 ~# E t1 h9 b6 v$ w
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,, j% W0 j0 C1 m
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static struct gpio_led da850_evm_tl_leds[] = {# `2 m' I `# i3 F; }3 t
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{
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T' u/ L' D, @7 X1 E& k .active_low = 0,
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.gpio = DA850_USER_LED0,# P' L9 X1 z {/ Q8 L! O! i
9 ~: {" \8 R' I7 f% W .name = "user_led0",* l# a2 d+ x% P# _5 h) U; u k
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.default_trigger = "default-on",
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.active_low = 0,+ C; m0 h- @/ F4 P( l7 ?
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.gpio = DA850_USER_LED1,
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0 Q! N% i4 p; F7 u .name = "user_led1",
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! [7 E# q* A/ a% ] .default_trigger = "default-on",, d7 c. f9 q$ l
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},
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' i; b, B- A. d1 |' O7 q .active_low = 0,7 o- q; I) x' U. Z0 U5 N
. H7 Q, u9 y* y: o5 ` .gpio = DA850_USER_LED2,
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# Z0 ?! o* ]4 n3 b2 C' [8 w .name = "user_led2",/ c4 J& d$ E" _% |2 u0 m- o
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.default_trigger = "default-on",
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},
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.active_low = 0,
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) h3 @- ~$ K* G0 U! t8 d .gpio = DA850_USER_LED3,
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.name = "user_led3",
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.default_trigger = "default-on",
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.active_low = 0,
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+ n0 R* E0 v* d6 B0 d& C# @- s0 a .gpio = DA850_USER_LED4," s. ~+ B6 `4 V4 N
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.name = "user_led4",3 D1 l5 d1 `' c. ?
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.default_trigger = "default-on",9 G2 y: u4 p5 r! d' U) u5 X# s1 Q3 p
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{- Y4 d- ] s- G% v8 x, p; b
" A/ m* c# [; F. s% d# c .active_low = 0,: n5 C; l" M% z* T9 @
3 F- i( Z/ Y/ a: k5 J# i2 J .gpio = DA850_USER_LED5,
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.name = "user_led5",
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7 {! I$ h$ M) q" B .default_trigger = "default-on", i& u, V" v b$ h& N
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/ u& L$ O/ O& Pstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {8 O: s' D% X' w+ O
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.leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)3 ]) `. T5 L2 z& B8 j
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static struct platform_device da850_evm_tl_leds_device = {
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3 k* T& d# r4 L, x9 g) \4 A .name = "leds-gpio",2 n* c& c g1 _; @
( N6 i- V* ?0 B! a .id = 1,0 C1 p1 m6 E2 {
3 ?2 B% A. `% z6 ~2 A .dev = {
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, R) `' h, K8 y4 I& a2 X* s b+ d' q$ R .platform_data = &da850_evm_tl_leds_pdata,
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/ C# I: [) B$ c7 w) O4 R .release = led_dev_release,
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}
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};
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static int __init led_platform_init(void)
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#if 0# F3 b1 c& J9 T% b1 U, [
+ g8 P' @2 z- w9 \* K5 p% | ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);9 m, d: Y! `3 j
& c+ Z7 e9 B4 y' k; o if (ret)
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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"%d\n", ret);
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; B9 K$ [' K8 J7 D3 Q#endif
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3 O. Z# L7 K' E- U& T ret = platform_device_register(&da850_evm_tl_leds_device);4 t. B5 |1 W" q9 ^
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if (ret)" T$ r3 |) @7 u7 c3 J: U, P, Z
w* V( Y# K# P3 N" p9 p9 I pr_warning("Could not register som GPIO expander LEDS");$ ?) {& H% p/ z- L/ i
+ K) @8 `1 d6 z8 Z8 D# q$ @* B else
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printk(KERN_INFO "LED register sucessful!\n");4 Y$ X' |6 U4 f' k. Q, J+ o
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return ret;0 n/ t1 n. O) A. _# k" x
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* w- [# P6 ^/ P' Tstatic void __exit led_platform_exit(void)
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{
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K- `0 |$ Q' i7 j4 j1 P8 S platform_device_unregister(&da850_evm_tl_leds_device);; J% w2 f# E7 z* ~1 W A
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printk(KERN_INFO "LED unregister!\n");7 u' n7 g0 O/ J5 F }9 o5 V; }3 e. l
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module_init(led_platform_init);
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h! p3 @' p0 `) ^2 n) Amodule_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");+ a9 x8 X" w3 @: O& N" H+ k
& s# J2 |7 t4 \0 a3 z, m7 Z$ eMODULE_AUTHOR("Tronlong");" W4 O9 {' o8 ~. I5 t
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MODULE_LICENSE("GPL"); |
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