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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
' j/ _) a, ?- @8 Z" Q/ B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:
$ `5 h1 f. y& _% ?#include <linux/module.h>) v2 V' t+ G1 x& z& T( [; n5 E' Y
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#include <linux/kernel.h>
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#include <linux/types.h>7 g* g: s0 A$ T! j
* Q& _' g9 L y4 b7 e' ?! e+ R#include <linux/gpio.h>
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#include <linux/leds.h>% z1 D: Y! C9 M: r) r
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>7 R9 m+ l' ?7 W7 s
! k: h$ k" t& f; X: G#include <mach/da8xx.h>
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#include <mach/mux.h>5 d& e/ c6 T1 y1 |
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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6 A3 k; q$ F" O: v% u6 F0 R#define DA850_USER_LED1 GPIO_TO_PIN(0, 5): b$ I. ?, l+ k3 I$ `8 ~/ s
9 O" G# ?6 i5 x: i#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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* O: g4 a2 U* _9 D* m#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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" H8 t8 @, V3 J* S#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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2 R8 S- c) {$ w% g1 P#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/ x9 z* w* g* w6 c( G; j/* assign the tl som board LED-GPIOs*/
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- s& i' q3 {- ^2 M |static const short da850_evm_tl_user_led_pins[] = {
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4 H$ T% Z3 m$ r- c /* These pins are definition at <mach/mux.h> file */' }" Z# U3 X& u' E& G
# b3 B' A* s! X% L }4 O 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[] = {; X9 j R; I2 w( {
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0 N. b( ^+ m- Q1 k6 y0 K) t+ D .active_low = 0,
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.gpio = DA850_USER_LED0,% |3 K$ R s0 ^$ t( Z3 A
3 U2 L* q0 s/ u m9 a. {' m .name = "user_led0",! }3 t7 h" c1 Q N
' J J- ~* G( l+ ] .default_trigger = "default-on",
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{
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' Y8 j0 p( i9 q8 q .active_low = 0,* i; X+ C. ?; G" q8 u
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.gpio = DA850_USER_LED1,
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.name = "user_led1",
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.default_trigger = "default-on",
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& f: l: g4 b: \" t .active_low = 0,
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0 Q+ R5 R# K2 P1 N .gpio = DA850_USER_LED2,7 G% `! [: @/ ^; M5 A3 N
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.name = "user_led2",
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.default_trigger = "default-on",
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},
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) k ?% _8 H1 U2 ~ .active_low = 0,' s& m' t/ H+ E; y
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.gpio = DA850_USER_LED3,
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.name = "user_led3",
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5 l7 V8 `) \. O .default_trigger = "default-on",
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.active_low = 0,+ b$ B5 P [* Q+ o
% w* {" X. g) T2 D .gpio = DA850_USER_LED4,
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.name = "user_led4",. d" V. |3 N* R& ^2 K
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.default_trigger = "default-on",
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6 _8 }5 m/ A' a% ~; o+ W .active_low = 0,) F4 ^0 h, n. S) H# z4 |# H1 m
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.gpio = DA850_USER_LED5,3 ?0 a9 \" \" o( S) m
& g- n- o4 T5 v/ F* }7 x& z9 u .name = "user_led5",3 R. y, r/ y9 n
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.default_trigger = "default-on",, \ G+ b4 u/ h) j4 t2 ] ]
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7 P0 L4 U+ H6 ]- B};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {$ D8 \: Z+ w: ?! I9 O- g$ K
, ~) o, ~% e7 U d/ ~( ` .leds = da850_evm_tl_leds,: q9 `1 O. a* G% m5 \
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),8 I3 I7 N/ C8 J/ Y
3 W8 f$ M4 d6 U7 |};
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, b9 @4 m% b( a) _4 ~5 p( T1 zstatic void led_dev_release(struct device *dev), w) U; [ [1 w/ A0 X
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{
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};
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% X1 r. |. R8 K0 ^0 C+ Fstatic struct platform_device da850_evm_tl_leds_device = {
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2 l7 B% y M+ O0 [" S( S .name = "leds-gpio",% m8 y& m) F) _5 J
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.id = 1,+ T; Z$ r: g% r5 N) a
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.dev = {
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& G- V% J# l+ X6 s2 D- ]6 _ .platform_data = &da850_evm_tl_leds_pdata,/ L, L5 y$ M+ i* t
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.release = led_dev_release,! L5 u4 A" b4 ~# z* G8 T
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0 B# I& ?. s* ~( J# |};
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- B9 L d- P9 M4 A4 n2 Wstatic int __init led_platform_init(void)8 m/ l. `1 l8 g" C0 Q v V8 q
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int ret;/ n# N2 ?6 J3 a
. t# M4 k* Y1 r4 E, d#if 0" ~# y( k+ y! V& L- p! j! A
$ M$ j8 k4 m x# Z* v ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);7 c, }/ D& W$ I: G
% c9 X0 |2 {% c* ~, ~ if (ret)' Y# c: t" _2 v
% U$ F& ?" m: \: e) ?0 x" |3 ] pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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& s$ j7 Q. A# I# ^' J& M "%d\n", ret);; O! t/ a. z8 x6 h
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#endif
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ret = platform_device_register(&da850_evm_tl_leds_device);
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pr_warning("Could not register som GPIO expander LEDS");2 U& ?8 a! q; h' J, `
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/ ^5 `0 Y- q* ` m% v5 N% f# z7 l printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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}
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* i: m$ x# n2 N3 fstatic void __exit led_platform_exit(void)
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platform_device_unregister(&da850_evm_tl_leds_device);# w. X+ Q8 P' J3 d' ~: @
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printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);3 q: I& A. A/ `- h2 V& @
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module_exit(led_platform_exit);& S4 T/ ?) z" l, L
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong"); n: Y4 _4 D6 y7 K
- }3 X$ O2 T5 l; T% ZMODULE_LICENSE("GPL"); |
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