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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:
$ S- v: n( z' l1 S#include <linux/module.h> c5 x/ z4 J& d$ l6 s2 m
( d5 [/ i# f3 Q( f- _# S; |#include <linux/kernel.h>
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) z4 |, v# u3 c; v0 R( r' r#include <linux/types.h>
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#include <linux/gpio.h>5 Q8 E, M. C7 G; V$ j
" x% E- W2 p8 ~# p#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>7 l6 K+ S) V8 w+ F6 K: [
! J4 ?/ ]3 k4 n7 P$ n& m1 b/ }#include <asm/mach/arch.h>
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#include <mach/da8xx.h># ~$ b' h8 Q% L+ T G! m. P
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#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0) X( U" q; U" J/ q7 | j& m
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)0 Z3 p: @* I% O# w& V T
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)1 t L* X) z6 \; V. O
" k% z" A* M. x; ~1 Y [' [#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)3 x( p8 y% [; o+ \* i5 C; p
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)' i) b& a2 e) M8 e. ?6 q3 }' P. T
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/
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6 m1 [0 c9 N# r( O o/ vstatic const short da850_evm_tl_user_led_pins[] = {
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% r, a& U% {3 a% A" G% v /* These pins are definition at <mach/mux.h> file */& {# a+ e/ K9 r0 J! N4 T
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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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static struct gpio_led da850_evm_tl_leds[] = {4 G; I5 |) y& ]% {3 [$ W
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.active_low = 0,
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# W. h5 ^. Z; j. ?2 }! K/ j/ A .gpio = DA850_USER_LED0,. {, l+ `, F5 ?5 C/ X8 `
) W8 |3 v0 H9 l+ F/ f- h' e& B .name = "user_led0",1 Z4 C, A; ^ X3 z
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.default_trigger = "default-on",
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! j# I; q0 q6 ~, ?, g% T; g+ y .active_low = 0,7 C# J _$ b3 y" y
$ f# \4 Q- h4 l .gpio = DA850_USER_LED1,1 }: `8 h$ n2 E
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.name = "user_led1",! k$ D7 s6 I W- c
- t" Q l6 y4 P# O! Z. U. T .default_trigger = "default-on",
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{
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4 r. [' k+ Q) S8 W$ [) c7 ^; v .active_low = 0,8 \) t+ ~. E* A
7 | j: a/ m- L .gpio = DA850_USER_LED2," O5 t8 s2 ]6 o: l1 e6 g
: j/ y" b$ |, H% X; `) _* l/ [ .name = "user_led2",
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9 Y( p8 j7 T$ ]# z& f; {, H6 h .default_trigger = "default-on",
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.active_low = 0,8 u+ D0 \4 Q. T+ z- U6 Z7 n
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.gpio = DA850_USER_LED3,
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.name = "user_led3",! |6 F: k/ L! g8 U0 u2 O
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.default_trigger = "default-on",
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.active_low = 0,
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.gpio = DA850_USER_LED4,+ s; s% `$ e3 q- `6 U* P, R
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.name = "user_led4",& j& F3 o9 T, h# f
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.default_trigger = "default-on",8 T t" g- e- z' N: f& m- E# u
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% e( L& X: n1 r" A .gpio = DA850_USER_LED5,2 Y5 B" V; K) `" T" q" G4 p# x
S) r+ G( G0 ~3 p& Q! F+ F% Y .name = "user_led5",; H6 \. t3 [, L+ R
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.default_trigger = "default-on",
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},
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};
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. {; N; J$ p! U) Ystatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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) e* N! e- X1 h; O# B .leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),; @% S6 V+ H6 p& [* m3 n
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};/ f9 o6 n# `7 d$ J1 a
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static void led_dev_release(struct device *dev)
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};
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static struct platform_device da850_evm_tl_leds_device = {
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3 j! A, L" t E$ e .name = "leds-gpio",
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.id = 1,
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, c2 R j: E8 J9 h) C .dev = {- d1 x% K( j* a' ?
) K" W* O' O' r9 e3 F- W5 ` .platform_data = &da850_evm_tl_leds_pdata,
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6 {3 X2 e5 o* J+ j( x5 G .release = led_dev_release,2 Z7 t/ p: q8 `" f( B+ g5 l9 X8 b
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};+ I9 x- [ E7 ]9 b3 F9 G
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( r+ _) P- X4 f$ X* R) tstatic int __init led_platform_init(void)* d; W) e. h6 m3 h( H
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{
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8 X( m( G" y7 I v5 o7 A9 m int ret;& T/ D. f5 o6 v# I) p
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#if 0
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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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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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"%d\n", ret);; Q/ E' k/ r7 n% ~% p
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#endif
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! A7 r! D% ^! j$ ^) l5 E7 c ret = platform_device_register(&da850_evm_tl_leds_device);0 r3 {4 B: r6 O3 c6 e* e
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if (ret)8 f/ g7 C4 d$ e5 Y. w0 e2 P: x
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pr_warning("Could not register som GPIO expander LEDS");1 O, U# _% I! x; O0 T W* x
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printk(KERN_INFO "LED register sucessful!\n");
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* M Y/ a' R0 O( w4 j4 ~ return ret;3 i: h4 ]6 x2 E9 h* A
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) \% D& ^$ d9 Y1 g& V0 lstatic void __exit led_platform_exit(void)" }' y, J7 E% W, _) ~9 G* w
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- X# c* W8 ~; x$ X platform_device_unregister(&da850_evm_tl_leds_device);/ P7 p- p* U* H/ G9 q
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printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);+ w4 z! |' |. k0 {; c/ r( A' g5 t
5 g8 z) R! c- f- t$ A1 ]module_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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2 I( U$ `+ f2 J; f) k" cMODULE_LICENSE("GPL"); |
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