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板凳
楼主 |
发表于 2018-12-14 17:29:27
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& [$ n8 I f. k0 R1 G/ y( p3 y& q" v0 D1 i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:
" G/ B7 |0 `. a/ V% Q& D#include <linux/module.h>; K9 j/ G" h; A0 o0 o" V- B
+ x$ i, D* A0 C' D7 |& k#include <linux/kernel.h> A+ ?# O4 _' ~0 n' n
5 l% p( }! t% e& D2 C#include <linux/types.h>
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; N; A! x4 h! i% P7 t#include <linux/gpio.h>! C( n% Q# x8 D- S
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#include <linux/leds.h>, @( f: f8 g: Z. G1 j- E+ `
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#include <linux/platform_device.h>) W; f: V' ~6 ]* O2 @$ X( x
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#include <asm/mach-types.h># Q& S& E' B$ @8 s" r* X+ s
: k' J2 I: h) S& O#include <asm/mach/arch.h>
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4 _3 W' K" J5 _" m1 u$ K" ?: p#include <mach/da8xx.h>
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$ E; \ @- B* G; v# Y#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)( h$ P3 f6 B6 J( H$ I
6 M2 b2 Q0 I! B# Z7 n2 [#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)2 o4 z% T& a1 N' w
# b# a, z7 Q y4 k# `( I#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)1 x, U( t/ X7 J- }1 b% W
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)4 t# h& K- U' F: R+ e+ Z' X' e
( g/ j J7 ]: i$ D#define DA850_USER_LED5 GPIO_TO_PIN(6,13)+ ~. t1 J4 _1 J2 b( ~, N
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/ }( _9 ?0 a+ d) N/* assign the tl som board LED-GPIOs*/* w# _4 N4 G, j/ V
& O: { f2 O0 h jstatic const short da850_evm_tl_user_led_pins[] = {# J+ n' P9 Y) L j
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/* These pins are definition at <mach/mux.h> file */
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13, z; L+ E v" }' [
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static struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,$ o+ v8 n$ J9 @# w! K0 K
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.gpio = DA850_USER_LED0," G$ d4 s0 z8 p- s0 [, v
* Z0 I0 g, C0 q .name = "user_led0", D6 o: G& @2 K! N1 y0 a
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.default_trigger = "default-on",
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},
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.active_low = 0,
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3 b- h7 N( X+ |! }' H( M .gpio = DA850_USER_LED1,4 r+ a: T, ^1 h( p
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.name = "user_led1",1 l) I9 n5 d8 B
3 s6 Q8 d& ^/ W/ h .default_trigger = "default-on",
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|& _5 T9 t( L .active_low = 0,
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1 y) R& t' o5 ^6 q8 @ .gpio = DA850_USER_LED2,1 C5 l% t# G# {
6 a2 G; J% z! S4 w% V4 Q% U .name = "user_led2",
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}& N" B9 e/ k" B9 Q2 l- }% n e( }& N. R .default_trigger = "default-on",
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},
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{
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" c) h P9 V3 Z8 d5 u r .active_low = 0,3 [7 ]5 k% m( p( ~. y- ]* _7 v1 i
' V& r3 L7 h1 d- o! V" U) J .gpio = DA850_USER_LED3," ?8 {6 Q' w; Y' w
- M; t' B" D; j* N .name = "user_led3",
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.default_trigger = "default-on",
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.active_low = 0,/ O2 B0 l8 e" l6 X/ \4 k. q6 M+ D
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.gpio = DA850_USER_LED4,# s3 K2 B$ d% T# U
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.name = "user_led4",8 h% w" I, _3 w' T& `1 C
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.default_trigger = "default-on",
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},
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.active_low = 0,/ O# ~4 G. ?4 O6 ~) ~6 Z9 L
: o# x ^5 l1 Q/ E* _) p* h( F .gpio = DA850_USER_LED5,! j' t8 m4 S0 Y4 L- T; P
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.name = "user_led5",
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.default_trigger = "default-on",4 p0 D: j1 Q, o3 I5 y
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% d3 ]' }0 T6 H7 R};
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) J$ y* M. L0 |8 v6 Z+ wstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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.leds = da850_evm_tl_leds,
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7 |' u- L( S$ N9 `& e1 { .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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9 m" I+ g! x2 D' X};
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static void led_dev_release(struct device *dev)9 T \9 j2 M. Q2 X
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{
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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,
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. W, p3 w' l6 E; J* ?3 O5 i e9 l+ f .dev = {
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9 `6 H0 Z' A3 F0 J .platform_data = &da850_evm_tl_leds_pdata,
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j( T0 W2 f$ K! O) z! ? .release = led_dev_release,
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};/ ]( ]% e/ E9 B. _6 A
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static int __init led_platform_init(void)& e @; b# f+ ]) e# }/ R
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{
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9 j, Y; d3 v* j* `8 U9 U7 A' N int ret;
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);" p) {! G; U/ x9 r
+ I, N1 [* ~3 H+ f3 w0 f7 v/ J: h if (ret)' w+ s; V* p1 P1 m( }3 X' D
! R+ K% H4 U: e9 B8 d pr_warning("da850_evm_tl_leds_init : User LED mux failed :"0 P m% w! z2 I: ?' F
7 x2 j# n3 A0 ~$ Y& y4 X. d' v: D "%d\n", ret);0 E/ M6 k4 m2 V9 V) T
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#endif# j' R7 R1 x: x. ^4 |
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ret = platform_device_register(&da850_evm_tl_leds_device);
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if (ret)
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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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return ret;
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7 k; Z1 F; s" g' M& zstatic void __exit led_platform_exit(void)
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platform_device_unregister(&da850_evm_tl_leds_device);* }' z" m/ C' ?6 O
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9 k6 i- u8 s' W5 { printk(KERN_INFO "LED unregister!\n");$ ~* z8 R6 V: I: ?! ] w0 Z1 i
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) _ d4 @6 o& I ?module_init(led_platform_init);* i- ^7 k( y, r5 r4 Z0 T
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module_exit(led_platform_exit);1 v! T0 J8 q8 Z2 t# j+ U4 U
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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' Y! ]4 E# D1 O n# g: ^MODULE_LICENSE("GPL"); |
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