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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:
9 A0 R/ R J1 `- N9 N#include <linux/module.h># O" `7 x& Z+ X
, j; n, u" L# X* w% K#include <linux/kernel.h>/ U; X/ u$ H$ c9 F* c8 K$ ?; ~
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#include <linux/types.h>
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#include <linux/gpio.h>
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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>; |2 C5 r. |! S* S8 ?
( O4 Q" h; ?' b! A/ D#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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# l$ ^; c) y! H4 `8 D#include <mach/mux.h>1 W% u# P1 h/ w" M, m' z* e
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)0 u# A5 ~' O4 G) R Y/ O! T5 K
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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7 O2 w4 b8 F/ V" h( m( [#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)* ^/ U7 N5 e: K! F: s' N" e
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)- O1 l n- M3 P' u! q; {* g
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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8 C$ j+ m [% B* ~8 w4 K#define DA850_USER_LED5 GPIO_TO_PIN(6,13)2 c6 {3 v& C+ e# g! m& H* B' T
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/* assign the tl som board LED-GPIOs*// z9 y+ x8 D, q! A. ~
6 N$ |7 y- f0 }* D6 G& Estatic const short da850_evm_tl_user_led_pins[] = {3 N* W4 X3 v4 ~- D
7 O8 G+ Z7 K5 h /* These pins are definition at <mach/mux.h> file */# o O' b5 _( Q
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,+ G# e- q) w* y3 y; _. `9 }; h
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static struct gpio_led da850_evm_tl_leds[] = {" N" H4 b3 A" c7 ?7 m" N
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.active_low = 0,
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' k0 Q, O9 j8 G6 p. B .gpio = DA850_USER_LED0,' M3 ^8 ]% |0 v. n. `
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.name = "user_led0",3 d3 \1 Z" H* L
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.default_trigger = "default-on",; f! F4 Y) ~7 e
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},
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4 t, G/ ?$ Y% H) q .active_low = 0,
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7 t% Y9 ^ J5 V3 ?! {$ X .gpio = DA850_USER_LED1,# D* Q0 ?- o( f! U% n
( `% R5 i3 b2 P( D .name = "user_led1",
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.default_trigger = "default-on",9 [* j3 H* y* T- \% a- R
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.active_low = 0,, U4 I2 b6 d, ^' [( ]# B
! E; e" Y8 j8 [0 P9 l! _ .gpio = DA850_USER_LED2,
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.name = "user_led2",
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* G: W; b E; D .default_trigger = "default-on",
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},
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, m$ c2 G/ d8 {; T1 U1 J .active_low = 0,
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; t, c8 G3 ?, ^7 L# w+ X .gpio = DA850_USER_LED3,
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" ~5 Y- n* K" ] d" ^/ ` .name = "user_led3",! K% F3 D3 `8 i+ Q9 A
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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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; X6 t2 b* _% u' P .name = "user_led4",
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.default_trigger = "default-on",
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.gpio = DA850_USER_LED5,, Q4 Y7 }& L& F) i8 r! b
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.name = "user_led5",
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1 ? R+ A& k! ?! J) o .default_trigger = "default-on",2 C$ R( t0 y1 g. U" W' Y [5 Y4 V$ b
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {0 j ]0 |+ R; I0 S5 k4 n
% w1 T0 u, w' C b# K& h .leds = da850_evm_tl_leds,; E0 u9 B) V: l L; K/ F
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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8 E+ ~. s4 D# ]' B* |3 vstatic void led_dev_release(struct device *dev)9 k5 Z& F9 y8 s
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, r7 w H* X' V2 D$ Ostatic struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",, z) F, R3 t, E& }
4 g* h* R$ \ x& o .id = 1,: P7 q- C ^4 m/ Y! B- C
. [; z3 ~, j: ?- b4 x .dev = {
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6 R+ H4 Q. _5 O3 G .platform_data = &da850_evm_tl_leds_pdata,' a6 A5 O0 K. v( K1 Q
) r( ]# G k/ K3 _5 W: k .release = led_dev_release,
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/ ~ d9 l" e1 xstatic int __init led_platform_init(void)
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, P4 }2 j g% w int ret;: u1 X0 }2 [1 A) k
( {, J8 T; ]) y5 ?; l#if 0
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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% @- x2 |- u6 Q+ H/ |! k% x "%d\n", ret);
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7 U. _& L2 y% E8 h2 x# x, o3 |5 F#endif; J3 c% f. r) l& L t8 u/ m
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ret = platform_device_register(&da850_evm_tl_leds_device);
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if (ret)
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5 h6 d" \# j8 T: [$ I1 q. r- d, M* f pr_warning("Could not register som GPIO expander LEDS");$ \2 D7 f1 U6 ]$ A. G
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8 Q r' b& Y! W$ w printk(KERN_INFO "LED register sucessful!\n");
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return ret; c- @! v; c0 q4 A6 ]/ P. @
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}
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( k6 f6 ~' N- l2 Pstatic void __exit led_platform_exit(void)) E w6 S& ^, x/ ^% C5 k
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platform_device_unregister(&da850_evm_tl_leds_device);
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printk(KERN_INFO "LED unregister!\n");3 y' H9 o4 I; }/ p s2 O/ J0 [0 X
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module_init(led_platform_init);4 F8 m/ ~/ r% j" @6 @# d2 J
- v; _2 c$ s8 U) P4 Gmodule_exit(led_platform_exit);( f) b; P$ T" W% F3 z/ G( d
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2 e4 t4 `7 f+ c5 U7 @MODULE_DESCRIPTION("Led platform driver");
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" @0 F: u# O1 W4 qMODULE_AUTHOR("Tronlong");# ^ i+ G, b% y+ [
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MODULE_LICENSE("GPL"); |
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