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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:- K d4 n* N' A6 d. p: s8 c
#include <linux/module.h>
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! l* p& v2 [% z0 J# s$ e" f3 S#include <linux/kernel.h>3 V, I9 A* e. Z+ n- ^# S1 u
/ r2 J B' E8 q8 h0 }! S" c- G#include <linux/types.h>
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$ @+ n$ D- ^# G/ C#include <linux/gpio.h>2 X$ U9 S9 {. X' r, @" ?* K2 O
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#include <linux/leds.h>
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#include <linux/platform_device.h>6 J/ }: W' E" b, ~5 L1 r
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#include <asm/mach-types.h>7 O/ g. V a; F7 l
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#include <asm/mach/arch.h>! s0 D7 P% ~8 _3 B/ e
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#include <mach/da8xx.h>
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#include <mach/mux.h>8 b) t, j& a, A0 t& g, x
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9 Z: o' o: {- j$ Z2 i9 I#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5), ]& R L) a- g K+ ?, @3 h
( K) a4 }6 l6 H( o5 J0 M' _. R#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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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)* A8 I6 ?, w3 R" S- [9 {0 N
i" J6 R( Y8 m) s& j0 U5 @#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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3 f+ w' w r& N: ?2 U1 N( p7 y/* assign the tl som board LED-GPIOs*/
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static const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */, r- f" J. v' D0 @) g
5 h% [ ^) ^$ i. y DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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-1
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};
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static struct gpio_led da850_evm_tl_leds[] = {
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. X8 \& f5 c% J6 I5 W9 d! H .active_low = 0,
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.gpio = DA850_USER_LED0,
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.name = "user_led0",9 w. _% U- ?* I
8 a5 ]3 K0 {& c0 D8 m G2 T .default_trigger = "default-on",# \, _1 K% J: b8 N
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.active_low = 0,
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4 Q* l0 U# n6 M .gpio = DA850_USER_LED1,; v2 p: S7 o& \! @: `( c' h
! T( \" ~' f& L- X. e8 f .name = "user_led1", b8 c) W; |0 C3 M/ n# ]; V
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.default_trigger = "default-on",1 L* ]1 U# O" g2 \2 j
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.active_low = 0,
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/ F n: H- U; \! |" h) P/ ^1 x .gpio = DA850_USER_LED2,
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.name = "user_led2",
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.default_trigger = "default-on",( i8 X6 a" H2 l/ G
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},
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.active_low = 0,
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.gpio = DA850_USER_LED3,! `) J- X* I8 `& R
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.name = "user_led3",
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$ r2 i. L; J( C% O- c# T .default_trigger = "default-on",+ L" A: \$ w% o- M, W6 j5 I/ y3 v/ c
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.active_low = 0,
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8 i- c; b. m! E# h .gpio = DA850_USER_LED4,5 v& J& d9 a! [) v3 z+ n* I4 N
. n' m2 U2 b1 z# k .name = "user_led4",/ @) _, w5 Z* v. b; I+ W! }
# z& o" m5 M4 e: I+ Z9 N; W .default_trigger = "default-on",7 u) N) \. h4 {' g/ ^- L. v7 E
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.active_low = 0,; X ~4 Y' [' R8 B
5 ?) ~( f2 D" \7 V5 ?5 E; {0 z7 I .gpio = DA850_USER_LED5," ?4 N' r. R& ?& V
% O7 x( e) {# _5 ^ .name = "user_led5",& a1 p) z; z& o
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.default_trigger = "default-on",
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},
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( R0 C4 a1 G; x6 bstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {. l; K/ ^7 M* ]7 Q4 g( w
9 n, ~# n4 D9 I) W .leds = da850_evm_tl_leds,* ?6 C$ U+ L y4 Z
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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8 o4 W n8 w$ C0 ?6 d5 f2 G7 |};
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static void led_dev_release(struct device *dev)- [ [0 @! m% k
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, f- k2 z' O5 t};
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static struct platform_device da850_evm_tl_leds_device = {
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7 T+ S: k8 d8 s' J) B3 ~2 w .name = "leds-gpio",. `0 r; F) D( A; \
# ]3 O# ^$ Y: L) `& `, \ .id = 1,
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.dev = {
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.platform_data = &da850_evm_tl_leds_pdata,
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" f$ l% M9 T6 {" ~% h .release = led_dev_release,
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static int __init led_platform_init(void)
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{
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! T( [' \! y) r9 Z4 `" t& K% S& F$ a int ret;
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)/ E: ^% A& I4 I5 ? s" I6 y
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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; h; X! E6 P+ n. u# S "%d\n", ret);
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#endif
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9 P- G% \6 l: u' A2 r ret = platform_device_register(&da850_evm_tl_leds_device);
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, V, j$ a( x$ L% H6 b8 _( G+ c if (ret)- U R4 ]! D0 r/ B# _3 w- H
8 W8 K; ? r: j+ W pr_warning("Could not register som GPIO expander LEDS");6 e* |' m. D' A/ }
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printk(KERN_INFO "LED register sucessful!\n");1 `8 w* {" g* |+ }6 L3 G
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return ret;
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}
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$ U9 ~( ^7 B4 W- N: g F+ wstatic void __exit led_platform_exit(void)1 e+ ?" D5 O) I, m% ^& `
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{
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platform_device_unregister(&da850_evm_tl_leds_device);
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/ z4 E5 V5 h1 ]! Q c0 x4 a printk(KERN_INFO "LED unregister!\n");
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}
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module_init(led_platform_init);
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. H- v5 @0 x9 m, H: Bmodule_exit(led_platform_exit);1 ^% j# l" U5 J' g2 z6 s2 ~5 z' U
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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% ?/ P, ^% q. M2 P6 {1 x7 p0 MMODULE_LICENSE("GPL"); |
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