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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:
& J& @0 W, x5 X6 L* Q0 v#include <linux/module.h>
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8 ~- j" @% n: U#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/gpio.h>5 n$ N' m% v" m6 C! Z
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>$ Q) c6 g; b0 T) ]/ t
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#include <asm/mach/arch.h>8 b$ A2 d) @/ t
5 m. z& _& A* [/ K# K; S#include <mach/da8xx.h>
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#include <mach/mux.h>6 Y0 b+ L8 v1 s: f& a6 V. v2 ?/ i
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& a5 m4 E, M& Y#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)0 j ^, w: T5 N8 W1 U
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)& y4 F* x9 i9 P- ^# h; }- J: v
" J& p. W" q$ B#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)3 v# I& y& L) A! N' J0 t
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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)6 c3 D0 Y% I) ~3 w! y. K
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/
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static const short da850_evm_tl_user_led_pins[] = {0 P# f; D0 a! T, e- D
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/* These pins are definition at <mach/mux.h> file */- @1 y- s7 h5 W3 D
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,6 K4 M& B. D( M ?. E
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static struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,
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# C7 C+ ~% v8 [1 n: F .gpio = DA850_USER_LED0,
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" D" w5 h( q. c! B) ^" a5 | .name = "user_led0",$ E) Q9 ?# D8 K( S
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.default_trigger = "default-on",
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.active_low = 0,
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% |, U/ o. _' I' a/ _- E .gpio = DA850_USER_LED1,4 `5 n6 N/ [0 I3 W8 R
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.name = "user_led1",$ J; \4 k% t9 J$ K2 _6 t
, V. a- W' h2 z& b .default_trigger = "default-on",2 w+ Y. ?2 a9 W" i5 n# W- k; o4 w
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},
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.active_low = 0,4 K0 {3 O! W9 u. x% H( N
1 y( c$ Y5 F5 _+ u, x' g .gpio = DA850_USER_LED2,
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8 u# m, z3 O0 _- }; d& r5 a .name = "user_led2",
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.default_trigger = "default-on", C: k! I5 s* |& F6 f; K- G
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) t5 R/ I0 c7 X .active_low = 0,- Q2 a! J) a* i \
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.gpio = DA850_USER_LED3,( m5 B6 X; |1 p4 q# S7 e6 L
9 A6 I2 \# B( l/ R5 O8 e$ i .name = "user_led3",2 e9 D) }; G5 D) p, y4 c& Z
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.default_trigger = "default-on",
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.active_low = 0,
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.gpio = DA850_USER_LED4,
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I) ]( Y( G9 ~! r2 P1 U0 F1 @ .name = "user_led4",
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.default_trigger = "default-on",
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3 M6 E \2 F$ ~ .active_low = 0,
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.gpio = DA850_USER_LED5,
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.name = "user_led5",; [9 j) o1 C C7 U9 a9 V1 ]
. a1 d/ l2 r, R% m0 B) s8 X .default_trigger = "default-on",
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" Y- f) _$ h7 a& H};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {- \& T3 d, M5 J& ]
' d- Z1 G" Y0 X( G .leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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};
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static void led_dev_release(struct device *dev)
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};" Z* f' j) h c0 C
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static struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",
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.id = 1,2 o6 I. C+ p( i8 t+ k
' v2 k$ M) M. n .dev = {
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$ ?- f9 A3 j6 G2 j8 U, H l .platform_data = &da850_evm_tl_leds_pdata,
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. \8 Q; k/ t7 C a+ h .release = led_dev_release,
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}
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};# t0 Z/ X; {# g! ]: }1 s5 t3 I
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static int __init led_platform_init(void)+ T1 q9 L ?) b9 V
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7 g+ g! R5 }2 N/ W int ret;$ K2 k4 \! r% m& G( b' D
1 m2 r* J6 {0 t: D#if 0
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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% i3 I! J6 N7 k7 H' r" N if (ret)
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) J3 i6 h4 j; f8 A# ` pr_warning("da850_evm_tl_leds_init : User LED mux failed :"( S3 @6 K$ m) N7 M; `
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"%d\n", ret);
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ret = platform_device_register(&da850_evm_tl_leds_device);( i- \# {7 Q9 ~/ _8 u( h, s1 j
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pr_warning("Could not register som GPIO expander LEDS");: d. `7 s# q! u( d4 f% F% y
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else
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printk(KERN_INFO "LED register sucessful!\n");+ g3 Q) r( o3 z4 b0 [7 q: n
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- V( x7 ?7 ~3 N1 Y. [( d0 Y& ^ return ret;7 d2 c+ w3 v* Q3 [/ @# k
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static void __exit led_platform_exit(void)
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, f- G$ _! g( _( S, W, ^# k) ?& q V platform_device_unregister(&da850_evm_tl_leds_device);
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3 e) B# ^/ K- B5 {+ V3 t printk(KERN_INFO "LED unregister!\n");8 W% U* @1 C: e
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: B! ~; f+ T5 l" Z2 [; }, l0 d% w; Xmodule_init(led_platform_init);
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& G( v" G8 @+ ?9 n! @module_exit(led_platform_exit);5 t4 P% T" A y
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MODULE_DESCRIPTION("Led platform driver");% Q% q! S- [! G7 z, A0 ~
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MODULE_AUTHOR("Tronlong");# E) w' a r, C6 v7 p6 |; [' i' t
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MODULE_LICENSE("GPL"); |
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