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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:) N7 d3 t3 X) J6 K8 \ E5 ~
#include <linux/module.h>
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#include <linux/kernel.h>( k5 ^# ]3 ?9 I4 w# X' w
2 _+ D! b1 P& a( c5 }4 f& H2 {& Q& q#include <linux/types.h>7 z: N+ ?5 q% n( M" s' b
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#include <linux/gpio.h>' f# r) R1 T, p4 Y" P6 u
9 J1 B7 O; j, b$ Y#include <linux/leds.h>
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#include <linux/platform_device.h>
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/ B. ~) U6 {2 @7 }, _5 C* }7 J5 A#include <asm/mach-types.h>/ q4 F9 M& z9 X- L6 V: [! ]. M
A6 ^# W% _9 U, t1 E' m0 h0 m#include <asm/mach/arch.h>" P1 X i' T9 ^- b% g3 Z; Y- R
/ e! o: p' q. E* P# A9 G#include <mach/da8xx.h>& r; B) _0 A [# \
+ t/ C/ A; u, u4 q, b S! r3 T#include <mach/mux.h>) z+ E2 g3 r5 W2 Y. M8 Y! r( f
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)# m: M, B6 |8 ?" R* N8 Y
4 \8 V# Q7 S, T2 y* k% a" P#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): r- h( o! H- Q& b* L. d
; T6 H, K& L0 O! |2 I! z$ P#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/) U+ W1 A! M1 P4 b
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static const short da850_evm_tl_user_led_pins[] = {
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: R; b8 Q5 }8 \ q" U /* These pins are definition at <mach/mux.h> file */
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. \! V& Q4 @( l, K1 p; [ 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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! R$ w! D) R/ `- Ustatic struct gpio_led da850_evm_tl_leds[] = {
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% m0 _4 f g U$ J5 _# C/ n) K .active_low = 0,; g/ a4 U. u/ A; _" L, g7 h' ]
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.gpio = DA850_USER_LED0,
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& @ }: r* V" O .name = "user_led0",
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.default_trigger = "default-on",
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},
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% V3 b; d0 b! e2 F; l$ c( L .active_low = 0,& {! O, O. o5 k) i
8 [7 {7 M! y/ i: C .gpio = DA850_USER_LED1,
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.name = "user_led1",
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.default_trigger = "default-on",! e- b. s& i4 M3 y! N8 H* H
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{
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% S, `, ` S _4 V7 P0 r .active_low = 0,6 Z& ]% H' X, L( D. p. n
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.gpio = DA850_USER_LED2, O9 x: x7 G& o4 v8 c1 N
' a0 W; Z9 ?5 P# Z c7 s .name = "user_led2",
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.default_trigger = "default-on",
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{# w7 M" S, Z# p6 C$ {7 N& M9 p
7 D5 T( }7 W. S3 y+ S' p4 j .active_low = 0,
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.gpio = DA850_USER_LED3,. t0 ~& j: B+ H
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.name = "user_led3",8 O/ V- p; \4 h* D9 e
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.default_trigger = "default-on",
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{
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.active_low = 0,9 h: |0 @* j& k
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.gpio = DA850_USER_LED4,( c8 b4 H" Y* A# w& |
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# Z+ G% R. d1 N7 P5 k .default_trigger = "default-on",9 B0 S# k, U0 U& U( C& [4 c, Y
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.active_low = 0, P' x- d0 ~8 T0 t
' I# y/ @& U7 G6 Y+ X5 H X .gpio = DA850_USER_LED5,
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* ]7 c, \4 Q/ N/ o' J+ u- E* _! P, E: x .name = "user_led5",. |: M K5 V2 |5 ~
4 [# Q; l) K- f7 n0 @ .default_trigger = "default-on",
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},
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {" W& ~* `8 U7 f; P! @
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.leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),0 _5 W) H* \; B4 ~0 |% e( N
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}; V$ a/ M3 E! W% ?3 m% ~
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static void led_dev_release(struct device *dev) J, @, K5 k0 N8 o# t( m5 p
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1 b' J8 T+ f, a* |7 A% ~: @ T7 ostatic struct platform_device da850_evm_tl_leds_device = {
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: K8 V7 d" m/ u& Q- j .name = "leds-gpio",
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% Z9 F+ R# F$ _. G, Z .id = 1,
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O6 K$ Z! E2 Y% K! j# h( m7 G9 H7 u .dev = {+ J0 ]0 |9 I0 x, X9 ~0 r/ X4 b
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.platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,
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}
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};
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static int __init led_platform_init(void)6 i$ N! n- ]: u- O9 ^6 ^4 g1 E% C
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& {" B0 d1 w- P: ]2 { int ret;+ x2 x+ N2 c, M
9 R7 U; H3 r. N#if 0
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6 P# g* q+ }/ Y7 { W ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)* r% ?1 m4 {/ R: T5 o" D
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"2 X1 j" ?/ \6 U
! S) c! [9 ]. |8 U8 _ "%d\n", ret);
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. \- U( ~4 Y, y- V& [7 r#endif. [4 ~( m' R% E1 b% F# N% Q
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ret = platform_device_register(&da850_evm_tl_leds_device);% S4 ?) b6 H N. M
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if (ret)
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2 p0 |0 [$ O0 X4 n$ p! w) Q- ^! O pr_warning("Could not register som GPIO expander LEDS");$ i" _' T1 {: k3 i9 J0 Z9 w' v
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$ r1 l4 Y# f/ y1 H9 h' n/ j# T printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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p; M, |% y% P( L# n$ nstatic void __exit led_platform_exit(void)2 y8 s0 w/ D0 G A3 E
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{% P' ?% ^6 Z" C5 F. q- a6 P
9 v3 n; N. I5 ~2 \ platform_device_unregister(&da850_evm_tl_leds_device);' R* n. T3 s& P' K8 G$ w
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9 q# G4 B8 A- O printk(KERN_INFO "LED unregister!\n");: m% v+ w9 k$ N* L) l7 D% ?! U
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& n- [; g7 q4 s* \9 P! }* Bmodule_init(led_platform_init);
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- L% G3 \2 U K! M: i" \. Gmodule_exit(led_platform_exit);
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6 P5 @ h$ m! d0 `MODULE_DESCRIPTION("Led platform driver");) d' q$ a! ^! w; [6 ]) y0 D
3 g9 a" y/ Y! P nMODULE_AUTHOR("Tronlong");& B* i4 P# O9 N* D; q% s
1 s. V$ g1 j" V- q3 XMODULE_LICENSE("GPL"); |
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