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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:. b& i& }; k b |
#include <linux/module.h>
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9 _, v* ?2 p& B& i#include <linux/kernel.h>6 s; r+ {1 |. S' H+ m
7 d$ d6 C- q( m( x" g* D#include <linux/types.h>
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#include <linux/gpio.h>1 X* W5 t) b* e% B
/ d7 G. I. a% m% [6 I; E#include <linux/leds.h>4 s2 E) G$ h6 K- o2 D. S7 e
2 ]) R% L) L: M1 B#include <linux/platform_device.h>
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1 t3 ]9 Q8 F% B9 h6 V#include <asm/mach-types.h>) ?, @) Q- Q) H2 }3 E2 I8 x: i
5 N7 d2 z9 M4 X" I8 `6 F/ x3 q#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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$ `, h% u! i& q V! p/ T#include <mach/mux.h>
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5 @, [! \; p8 L9 R* N! s/ G. Z' g4 F, ^#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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( |4 B2 W$ N. f. c: @: B1 F5 `#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)$ q' p0 O+ q& g) {2 G1 m
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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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6 B1 J# h$ i6 Q' T#define DA850_USER_LED5 GPIO_TO_PIN(6,13), g% b& z; t, H! d' d/ E
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/* assign the tl som board LED-GPIOs*/
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static const short da850_evm_tl_user_led_pins[] = {
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6 w' f3 \3 ^0 W8 N /* These pins are definition at <mach/mux.h> file */
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6 l/ f7 X5 k( U2 r5 @' k! ?& f& B0 y. r DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,& {4 w( h' s+ F f2 R
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static struct gpio_led da850_evm_tl_leds[] = {
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{
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) r4 z" q6 u0 B: i( Z .active_low = 0,/ _# x! Z; w4 O1 M( D
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.gpio = DA850_USER_LED0,
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.name = "user_led0",: b" q, Q3 `, F: w( h
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.default_trigger = "default-on",
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.active_low = 0,( v7 N7 v3 h' }$ Y1 ^1 i0 t$ Q% l
# ^4 j3 g ]9 ] .gpio = DA850_USER_LED1,
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.name = "user_led1",
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.default_trigger = "default-on",
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.active_low = 0,
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1 n1 T, A" r( x7 @ .gpio = DA850_USER_LED2,( p% w- ~4 K4 t- e
% E: j; K' ~' G9 m! J .name = "user_led2",, A) z3 q8 M7 k8 |/ _+ z6 }3 V, U
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.default_trigger = "default-on",( N4 p/ K% f6 i! m) R2 H: m9 x/ e
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- i! O9 n" q# ?! u% N .active_low = 0,4 e% M. X7 u4 E
$ d7 m8 ]6 }1 W' _" G D .gpio = DA850_USER_LED3,
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.name = "user_led3",/ I$ N9 K" M0 ^+ i
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.default_trigger = "default-on",
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},
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.active_low = 0,, `$ k8 o! t) B. k9 C9 p
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.gpio = DA850_USER_LED4,
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& \+ G/ o4 A0 C; ^; C8 Y" b, J .name = "user_led4",6 a) E8 |4 z5 v3 t
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.default_trigger = "default-on",
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{
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.active_low = 0,
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3 Y4 d0 U3 E6 `7 b. M6 V2 s1 V w .gpio = DA850_USER_LED5,
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.name = "user_led5",
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9 X$ W# i) i5 e& Q3 k+ a0 ^ .default_trigger = "default-on",
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- L P# G5 n% j! sstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {2 N; M2 V5 [ N/ t5 F/ e
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.leds = da850_evm_tl_leds,
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+ V. G. D8 }' u- w .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)/ r5 `* m8 \' j2 u( D
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static struct platform_device da850_evm_tl_leds_device = {. R/ k, r6 U# }: O
8 C: J3 d; I) n* ^" E .name = "leds-gpio",
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4 f( i" k- Q$ g' R- |9 v .id = 1,
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.dev = {1 S. g( v- x2 b; a; h
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.platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,* H6 t( X8 I9 L7 m7 Y
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$ m5 p# i/ `2 T( F, mstatic int __init led_platform_init(void)
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* n+ I+ G( x3 Z& T) ]8 j/ n int ret;3 \, f7 @/ d& e% } Y* ]
4 z$ D/ l) [/ Q: q+ I( p5 c# ]#if 0 c8 P2 M3 ^' l1 A+ h' J
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);7 P J5 q$ }: @: i
% l' T! N9 R9 t& e if (ret)
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9 o4 y/ z4 Q# U3 Z" f pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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/ y* @3 j' s8 T* O# a9 X ` "%d\n", ret);: @1 r4 S0 J; |9 C% X5 e4 Y
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#endif$ x/ U0 v7 x% B" n( M) r: R
; q$ E1 w+ V9 K ret = platform_device_register(&da850_evm_tl_leds_device);
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if (ret)
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) N* l9 p/ v! c pr_warning("Could not register som GPIO expander LEDS");1 l$ b- ?; b: f/ Y' a/ m- x
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else: j, V/ y8 ]$ G
8 [6 _: ]$ o: p# G: Y0 y printk(KERN_INFO "LED register sucessful!\n");
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% G( ]0 Q7 s1 ]: \, e0 a8 @! K+ O return ret;8 z" V7 X+ O" B
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}
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static void __exit led_platform_exit(void)
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{
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platform_device_unregister(&da850_evm_tl_leds_device);
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: R3 o+ ?$ S' V5 \7 F: Z: i printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);8 V e' A; i$ K+ V4 Z7 w: u2 }# r
! s+ D, f5 A% ^module_exit(led_platform_exit);0 u! |3 m, C% U) Z
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2 n" V$ f# ? RMODULE_DESCRIPTION("Led platform driver");3 y# ?) F' ? r* M4 o
; L X* H" e. k1 |2 jMODULE_AUTHOR("Tronlong");
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" L2 ~% t2 h# c( eMODULE_LICENSE("GPL"); |
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