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板凳

楼主 |
发表于 2018-12-14 17:29:27
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t5 t( a2 x) e1 o1 m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:
# U! b4 A, ~ Z#include <linux/module.h>
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3 K7 S4 c' y1 m2 d+ d: |#include <linux/kernel.h>
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% y, b- Z; W+ D( T/ |6 p3 B! L#include <linux/types.h>
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#include <linux/gpio.h>
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#include <linux/leds.h>; X0 g! C7 e5 s
: ^/ Z0 \5 P/ K6 R: x9 n: V5 M#include <linux/platform_device.h>
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#include <asm/mach-types.h>) e" y3 s# F( L1 {
& p. l0 t( x% k# v M; y: ^: H#include <asm/mach/arch.h>
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#include <mach/da8xx.h>% w+ d8 m" P8 k! a6 |
1 s% n; l% }; m9 N#include <mach/mux.h>2 I) \8 a( G* r3 f
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0), F' d$ M2 ^& x; k- v* v, I& g
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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0 J1 ?8 k- K$ T5 e& o5 ^#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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# e% b# }" ?9 k, K7 \3 B+ F#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)( R4 m6 J3 V6 ]- f$ o
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13), g5 {+ b; F4 C* m6 n
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/* assign the tl som board LED-GPIOs*/
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7 A5 J. [" \8 L* N+ Y$ Mstatic const short da850_evm_tl_user_led_pins[] = {/ v1 w2 ^7 F/ U0 S+ r/ J0 N, D
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/* These pins are definition at <mach/mux.h> file */
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/ p' O" L& k5 r) s1 W5 g 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[] = { }- j b8 D1 ~4 g: }! _, L
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* s# L; x1 Y) g6 Z .active_low = 0,1 c6 p+ B3 w. x& K/ s% T
# E3 r! \6 N; Q' B' C: V .gpio = DA850_USER_LED0,3 C4 p+ D0 f! w( ?" K' w9 w M9 m! A
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.name = "user_led0",
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4 h4 ?( O3 i* X3 L .default_trigger = "default-on",& N3 u3 J+ [4 V/ v# r% A" g( ~2 K8 z7 y
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.active_low = 0,* ]" g# H( }/ t* N% e+ }
- _) }7 U* i' `) J .gpio = DA850_USER_LED1,
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.name = "user_led1",7 R! r6 R# Z2 s
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.default_trigger = "default-on",+ X) q$ J6 M) ]) I8 |; b
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{
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.active_low = 0,
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.gpio = DA850_USER_LED2,
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' ^ ~) H/ w& P( D% A3 D2 x .name = "user_led2",, ]3 w5 u) y6 s; W5 C6 s% C
/ C1 d. }; @3 x: A% c. o! m; o .default_trigger = "default-on",' i: C# i! C2 R* T0 I, C( g
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{
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.active_low = 0,
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8 g- V+ z1 A* x" z1 { .gpio = DA850_USER_LED3,7 k7 d4 u. Y' w( f3 K
0 N8 }: m: Y7 j- T .name = "user_led3",' T* J6 {/ s8 V
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.default_trigger = "default-on",
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8 L5 s0 e. L7 X' p% a* R& }0 t .active_low = 0,
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# O! {6 F1 Z* c .gpio = DA850_USER_LED4,& [! N3 ^* a. g) j) w0 E9 O" Y/ d
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.name = "user_led4",
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.default_trigger = "default-on",
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& \+ J9 f3 S7 v% j .gpio = DA850_USER_LED5,
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.name = "user_led5",0 `0 i `4 |+ ?8 V; |, S
) K) J0 {) b+ n8 a .default_trigger = "default-on",3 f* Z5 [; k* s" B+ P
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},
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};! ~. _; E9 T4 M$ h- L9 |6 n
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& V' L! H f$ tstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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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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};9 S& o7 w9 s4 o
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static void led_dev_release(struct device *dev)- \& w3 e i) P+ M4 L: x, D' w3 M, L# {" D
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static struct platform_device da850_evm_tl_leds_device = {
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" f2 a( n$ \, m7 v8 e0 T .name = "leds-gpio",8 G7 O" [" ?* C8 Y% Y
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.id = 1,
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& ~8 ^5 C6 z- n9 v .dev = {! O S& l* H3 J
. H' V9 X1 R3 L .platform_data = &da850_evm_tl_leds_pdata,
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3 Y! _) Y( \7 K: `+ x. E9 ^ .release = led_dev_release,6 V* D5 _( r" C% R$ t" l
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G* H: Y8 M8 y: `8 ?4 bstatic int __init led_platform_init(void), O5 y. j! m( ?" I, K
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{
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# k# h) X. G) h) d int ret;
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret). x+ B6 i2 w4 I* J- d+ z4 K3 P# t
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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" R3 u; u& L# S0 ? "%d\n", ret);$ e7 |+ D8 S X/ M5 S& J+ F
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1 o `: f2 g/ n- Y5 g1 E2 u ret = platform_device_register(&da850_evm_tl_leds_device);! j2 Y1 Y% O# k7 h# _7 ?: Q5 k1 s6 l0 {
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if (ret)/ W K* p) Z e1 J9 M6 ?' `* }+ W# l
0 e- `. y( F% D* [4 W$ } pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");
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# ^3 n/ W0 B) b# l' M( T return ret;
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}
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static void __exit led_platform_exit(void)
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2 E& ?: S3 l8 c# ?8 q) ^1 j, M platform_device_unregister(&da850_evm_tl_leds_device);! V, c& `: Y2 J; C$ t; f
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printk(KERN_INFO "LED unregister!\n");
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7 i2 Y$ }1 N( p$ s% bmodule_init(led_platform_init); s- L% U5 R+ m7 s5 p7 f0 ^
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module_exit(led_platform_exit);
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# G+ i1 _& n- W
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MODULE_DESCRIPTION("Led platform driver");+ p% a1 ^% }+ r: c8 o5 P! F2 s
! U& q W" x1 |- o0 H2 ]% ^MODULE_AUTHOR("Tronlong");
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. \# M8 N9 [9 A) O0 w7 KMODULE_LICENSE("GPL"); |
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