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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:
; A2 J# b) Z1 d& j8 s#include <linux/module.h>
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#include <linux/kernel.h>9 U. ]) c( ~( r/ Z6 Q/ R0 D( N% N# ~6 s
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#include <linux/types.h>) K4 R; T$ U8 r
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#include <linux/gpio.h>
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! y$ C7 k. ?" X- {# S#include <linux/leds.h>
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#include <linux/platform_device.h>
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) f% X" w* k( k8 V& H: `#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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3 T, p- L! x1 ^# ~, E6 g6 W#include <mach/da8xx.h>- G3 q, l$ _1 L4 q" ^) a
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#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0), P3 P2 ?: P' O* \+ H5 }! J
0 ?7 A. K4 r5 p/ h#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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7 S6 Z( E: r6 @: ~5 A#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)0 P/ c/ L8 @( r+ U' w( ~$ s3 x( _4 J
- A) V, B$ q0 z, j) K#define DA850_USER_LED3 GPIO_TO_PIN(0, 2). e+ _6 X) e, f
0 W6 T; P K. D+ s9 b7 |#define DA850_USER_LED4 GPIO_TO_PIN(6,12)6 A$ m- W+ g7 K
( F# X/ w9 Z. w# u: g#define DA850_USER_LED5 GPIO_TO_PIN(6,13)1 U9 s. N: O+ f8 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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- z2 k& F) \% O /* These pins are definition at <mach/mux.h> file */
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' h$ ^) X, F" j" I DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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( d z: R* f/ @: z; r! `static struct gpio_led da850_evm_tl_leds[] = {
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* Y: _' X" S0 T( S8 f9 R .active_low = 0,
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.gpio = DA850_USER_LED0,
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* y7 X% R+ \) r3 P3 u .name = "user_led0",
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% D! E" S, ]; T m1 o/ a# { .default_trigger = "default-on",, |4 c4 k! m) w' i, m; V
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: r7 i J2 e s( S% {/ J- m1 \ .active_low = 0,/ [ Z3 O& W8 ^& o! S
: D4 u2 {- O5 | j! _5 I8 k .gpio = DA850_USER_LED1,! _: {! Q$ r% o- u
# N! c3 D7 Y* ~; C0 H .name = "user_led1",
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.default_trigger = "default-on",
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{
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$ h! w' X! ~- {2 m; L8 V: m .active_low = 0,( B2 S7 u. M$ ~- U8 R$ l
$ ~$ V7 ]+ J+ _, u! {) m7 C .gpio = DA850_USER_LED2,! N6 O" D7 {# k2 A
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.name = "user_led2",
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.default_trigger = "default-on",
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.active_low = 0,
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.gpio = DA850_USER_LED3,
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2 C: E, \$ V1 P% @0 D$ f .name = "user_led3",6 l! B% z2 u4 U: K( {# [
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.default_trigger = "default-on", \* _3 a5 ]1 ~ ?2 e% B$ q
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},
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{
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$ m2 ?$ G0 E( n& s" `1 E3 {9 X2 d .active_low = 0,
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.gpio = DA850_USER_LED4,
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9 G4 u, A+ T- O }3 v .name = "user_led4",# L5 V$ S3 d `' m
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.default_trigger = "default-on",
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},
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{
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.active_low = 0,( m0 o( c# s) s) B
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.gpio = DA850_USER_LED5,
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.name = "user_led5",
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/ I' K* g& g8 b& f( r- h3 Z .default_trigger = "default-on",
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {& C4 ~4 b0 }" E7 x. ]& Q
+ e5 P0 P- H8 A) x* R8 G .leds = da850_evm_tl_leds,, }% Z, t+ E0 j. A+ U' J
) f+ _" w/ g& g .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev). U+ }$ B. R& z
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static struct platform_device da850_evm_tl_leds_device = {: F, ~9 H% z* N' u9 ]
! B4 n1 I* n F3 \9 r7 b) Y% H .name = "leds-gpio",
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, S1 H$ R# t3 N: L$ r2 N .id = 1,
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* a/ K1 z* L% {( S .dev = {
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.platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,, u& h4 i% S- u( _7 O, o1 `) p
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static int __init led_platform_init(void) U- o* T# ~4 P
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{
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int ret;
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4 @# q! a( q/ v8 M" d' q ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)( {5 S7 `2 ?# z# h0 [; r" D+ F
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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"%d\n", ret);" ^9 R& m4 |. q
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#endif* X& C) p% x' i
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ret = platform_device_register(&da850_evm_tl_leds_device);
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9 H5 w/ ]; j) p7 |3 i/ r if (ret)
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4 d% t0 N" X7 g2 ]! o pr_warning("Could not register som GPIO expander LEDS");
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else
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printk(KERN_INFO "LED register sucessful!\n");* m! \. ^( v* |0 d2 I1 f$ d7 f% I
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2 N8 V+ y9 m# N9 R: L+ n! E return ret;" i3 v, x3 f& h* \) F4 C
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static void __exit led_platform_exit(void)& z' N, t- ^$ _& z3 _
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platform_device_unregister(&da850_evm_tl_leds_device);
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printk(KERN_INFO "LED unregister!\n");3 Y+ Y! n* w5 k3 C1 A
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3 I- ~, y: v$ g* a0 dmodule_init(led_platform_init);
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module_exit(led_platform_exit);
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- q7 S: z; `+ i# f5 j; v+ ?! MMODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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% y" G: \* n- OMODULE_LICENSE("GPL"); |
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