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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
9 r: ?3 F o+ 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:
0 B T% T* P% J5 |6 W- C# p/ [1 D3 M1 d#include <linux/module.h>+ V4 r7 a4 j9 @: c- J% \
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#include <linux/kernel.h>. f5 h8 k! M! j+ {. Q1 W7 T: P; V
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#include <linux/types.h>
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#include <linux/gpio.h>
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' j' j! G; ?. E1 `7 q, I#include <linux/leds.h>' a0 T" r: t; B; E
5 b1 {- l4 s9 K- j#include <linux/platform_device.h>" x! B/ J+ T5 q' V& U6 K) e
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#include <asm/mach-types.h>5 h/ X1 Z+ g9 r
# {1 T6 S, Y9 k$ D! Z6 Y#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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& t! ]& Z3 u3 q) y#include <mach/mux.h> D. F' \! C6 h) L q! {
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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4 W. p$ W: y M) l- B( o* }#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)$ u! k% W0 M+ }. g7 k
( {% K4 o+ v4 E7 ^#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)/ h% b3 U4 u5 O! D
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)6 }& p$ u, m4 X4 o& A
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)4 f" J: O! Q8 v9 x
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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0 U, ^- b# k/ C4 A# \9 | ?" f5 _/* assign the tl som board LED-GPIOs*/
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. `' B& V. \: _$ }static const short da850_evm_tl_user_led_pins[] = {
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$ l8 n+ }' ?0 C- ]7 ]! \; q* O$ v /* These pins are definition at <mach/mux.h> file */0 a+ Q+ `: S5 m) k2 f9 p1 c/ r
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,+ _' e6 H- F+ l/ N- B& w9 Q, O+ `
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};
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static struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,, M, x% q0 z' J* K3 } E7 V
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.gpio = DA850_USER_LED0,
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* t4 f1 m# @6 f2 { .name = "user_led0",
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' O" `9 v l" F$ O4 M3 C5 k8 Y .default_trigger = "default-on",
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$ N! ~( { ]2 k4 y- A9 F+ V .active_low = 0,
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.gpio = DA850_USER_LED1,
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/ S( [7 e7 k/ P6 J .name = "user_led1",- Y$ r! p: }9 O; t
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.default_trigger = "default-on",- a V7 u8 u/ K+ T! V8 i+ x
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, [/ t v" U% v1 _ .active_low = 0,, r I& P7 h, N8 ^$ n) c! q+ J
9 M8 k' u2 C. P! K4 O: G" Y b# K .gpio = DA850_USER_LED2,
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, o! U9 A# \1 W A8 Q7 q .name = "user_led2",' N+ ]; G) S& ]0 S
; s# G/ N9 @3 x* |" g T .default_trigger = "default-on",
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},
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.active_low = 0,6 p) ]- u, N# H2 T! X
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.gpio = DA850_USER_LED3,
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.name = "user_led3",% t; Q; u# T" w/ }3 k
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.default_trigger = "default-on",
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},
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.active_low = 0,1 e ^: I+ J) g( N9 L) p% H- b
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.gpio = DA850_USER_LED4,
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.name = "user_led4",
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.active_low = 0,
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.gpio = DA850_USER_LED5,$ F) x. {# c1 ~% ]! e
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.name = "user_led5",, O) _( i, H6 I5 v: I% \# X
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.default_trigger = "default-on",
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},
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' T# M# ^0 \$ d$ W8 Mstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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.leds = da850_evm_tl_leds,$ s2 r V" @( U8 N! g. u# Y& q
4 d a8 x9 L7 [' l .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)7 g, X- w6 G4 }& ^% y
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* ^- _, u _: Y( l7 n$ Ostatic struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",
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.id = 1,
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* E- C* a+ \! @! m T0 {2 a1 H7 f .dev = {5 W/ Y+ H8 t: F7 d
4 f" O) N" h& B9 j( m .platform_data = &da850_evm_tl_leds_pdata,
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# E6 B! D V' E' m2 d4 }: h( j .release = led_dev_release,
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};
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static int __init led_platform_init(void). i- b5 w* t' c; k6 o* p' U- L
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{
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int ret;
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}4 q# v1 H0 d+ O& q) C) l4 c4 W#if 0
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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, A8 u% H7 `7 m/ Y" m pr_warning("da850_evm_tl_leds_init : User LED mux failed :"9 p8 R# {: _: P8 S
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"%d\n", ret);
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#endif" G6 }- F k- {% ^
! R, h0 D: Q/ w9 u) w }: |8 A0 V ret = platform_device_register(&da850_evm_tl_leds_device);; e5 j' e$ B2 s Y* L( [
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if (ret)* F1 h6 E7 S w) t! K
1 i# ~$ y6 u/ n( Y O! M pr_warning("Could not register som GPIO expander LEDS");& n: ]! d3 ]2 @6 h, A& x5 |
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else
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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static void __exit led_platform_exit(void)& t% Y9 x0 j+ Y z/ w6 J
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platform_device_unregister(&da850_evm_tl_leds_device);- I! u; p7 F6 n2 z& Z
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G: ?- i" ?! Q+ I5 @8 \+ l printk(KERN_INFO "LED unregister!\n");
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}; N8 Q$ Q R6 p# U
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module_init(led_platform_init);
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module_exit(led_platform_exit);$ ?" H: w: g: S7 J6 S3 r
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5 b! ^' x1 z8 N1 c, D. CMODULE_DESCRIPTION("Led platform driver");2 Q. O# S# A4 g E
3 |% \- D* D9 _5 J! S* sMODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL"); |
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