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板凳
楼主 |
发表于 2018-12-14 17:29:27
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0 t$ b9 F4 f- {& P5 }2 F0 O, f8 h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 M! J" Z9 v; M3 f3 g+ P4 d0 j: X#include <linux/module.h>. i0 r% G2 s) q
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#include <linux/kernel.h>) L5 J6 \, \) E6 L0 M" L
1 L" _( w) v0 ^, A7 g$ t& l#include <linux/types.h>7 q1 u' W: a. n& ~& J
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#include <linux/gpio.h>
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1 Z7 J! l/ [- |( C#include <linux/leds.h>
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#include <linux/platform_device.h>
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5 T R: ~0 g4 C; n#include <asm/mach-types.h>
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( S( A; H# Q; b* @#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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$ M/ e9 c. W2 b: F! n#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)3 e* W% p$ x, o; T7 P, H( [
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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, ]# V- Z/ r% m9 X#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2), U, Y5 e; F1 |" k" E7 O
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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8 _' s# v: N# I; A8 h6 y' M#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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' W" u" G. B& C* W) w- F- z, i/* assign the tl som board LED-GPIOs*/* ?. \- k) b6 K. W
8 k0 L H) k, Z& S3 S3 i8 }/ f* q$ Rstatic const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */. S" Y. G! X+ [
5 V" D/ K1 F z+ W, p- Z 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[] = {7 F7 A$ J7 F4 G4 k* E6 R! T
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' r/ w g2 D }2 e .active_low = 0,
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.gpio = DA850_USER_LED0,
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.name = "user_led0",
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5 R) K0 K2 Z2 N$ m. T4 D .default_trigger = "default-on",1 ]+ I+ n. A4 C
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.active_low = 0,7 g5 x1 c' B7 o
* b+ Z+ p4 e7 p: k% [) D .gpio = DA850_USER_LED1,: G" W0 [4 S" G
4 s: R- C2 d8 L .name = "user_led1",$ |& W% |/ H9 [5 S. u9 R) |! p
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.default_trigger = "default-on",
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},
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.active_low = 0,! J" }' z+ c9 p# Z9 R) F) R# H
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.gpio = DA850_USER_LED2,7 i4 o3 _1 d5 w C
7 s7 V0 r! P% j# G1 l: q1 [+ m6 p .name = "user_led2",
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% ~% \$ j& I: h6 A) q b3 ^ .default_trigger = "default-on",
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{1 s+ {% s X% d .active_low = 0," \5 e$ L+ o' W; ~! h9 w9 T
5 C$ i: i) U0 Q( i .gpio = DA850_USER_LED3,
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.name = "user_led3",
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.default_trigger = "default-on",
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{
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.active_low = 0,
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.gpio = DA850_USER_LED4,
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3 [; S6 `6 {0 o: W0 [" J .name = "user_led4",
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, e0 x w* d T+ J) _ .default_trigger = "default-on",
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.active_low = 0,& T" u: [6 u' R8 w7 h+ k
8 Z0 U2 ~3 y9 `% P: v' ?1 M4 b .gpio = DA850_USER_LED5,
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0 Z; P) A; I% u% b7 Q8 O .name = "user_led5",
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# t+ T3 q6 g; j% D3 [1 W .default_trigger = "default-on",
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},
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+ m4 k3 Y9 k; d" ^, W/ H};
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$ N0 M1 F2 k7 H! P. ], qstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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8 E: e# s& x8 a! Q3 ? .leds = da850_evm_tl_leds,( j$ x0 Y% P- l6 r! U5 j5 u
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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; L9 {3 n$ F/ d% U};
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static void led_dev_release(struct device *dev)
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* x$ n8 Y" z. H4 q% Ostatic struct platform_device da850_evm_tl_leds_device = {
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% p; S# y: X! D* a .name = "leds-gpio",
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.id = 1,- }, M5 K, N& t# A2 L; c& H& s, i4 W
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.dev = {
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.platform_data = &da850_evm_tl_leds_pdata,. k( y, n7 K' V! T# {1 j5 z3 ^
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.release = led_dev_release,2 Q7 d' Y9 v C: t
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static int __init led_platform_init(void)
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int ret; B9 v# w. A9 D( F9 M
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#if 0
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);1 o' L/ X) b x: S4 a, K+ r
4 ?/ h1 e# \ g6 g% X6 O if (ret)$ H" b$ I9 X8 C' Q$ k1 K/ O/ f1 Y
+ T- J5 ^7 s% U: l& N pr_warning("da850_evm_tl_leds_init : User LED mux failed :"* u* d6 ^+ h/ o* l" P) m6 R
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"%d\n", ret);& t5 B3 y! h! P- ]6 Y1 C
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: s7 H4 h+ |' P0 x ret = platform_device_register(&da850_evm_tl_leds_device);! ]. z# f3 z k/ H( A
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pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");
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8 x5 Z9 D A$ `$ S. | return ret;
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8 ]* F0 u1 E# {static void __exit led_platform_exit(void)
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{
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/ e( I1 e6 y# M2 ` platform_device_unregister(&da850_evm_tl_leds_device);
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' z6 T7 |' ~8 Y& o" n printk(KERN_INFO "LED unregister!\n");! Z2 i: Y; O, U4 u/ B
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module_init(led_platform_init);
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4 M- O. d6 f5 h0 k" ^. gmodule_exit(led_platform_exit);+ S6 d& x: M% C C
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MODULE_DESCRIPTION("Led platform driver");. S `/ r2 J7 s1 K
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MODULE_AUTHOR("Tronlong");& r7 q- I- I( _) e% U
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MODULE_LICENSE("GPL"); |
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