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板凳
楼主 |
发表于 2018-12-14 17:29:27
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; ~8 J6 f7 m+ u" a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:
( [, T+ v" s( ~5 M5 m) [( E#include <linux/module.h>1 Y% ~1 b& t1 t& x7 s' _$ w
7 N* g6 u7 e. M; Z3 u- E+ p#include <linux/kernel.h>- h ~+ @" u" }2 e' u+ ]1 E
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#include <linux/types.h>
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+ d- W/ ]: p, `( D1 Z" d#include <linux/gpio.h>
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* @7 z7 Y2 d: E: p9 i#include <linux/leds.h>
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5 t, h C; N" H$ V& x: g% Q#include <linux/platform_device.h>
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#include <asm/mach-types.h>
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1 n/ g# |( U4 A) j1 g! t' o#include <asm/mach/arch.h>
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#include <mach/da8xx.h># S& b3 |: w5 L& t9 k( Y: Q9 {
6 G: v1 x' C7 L, y#include <mach/mux.h>8 u% `* A. O: `9 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)
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' t: j \; }# h7 A- Y' u#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)1 \/ r, Z1 q1 N, ^& q
: m6 _7 v) m* n& T4 q- b/ s#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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/ s. P' l; O/ D" t8 h8 E7 E" ?#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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: S9 U7 _; `/ X; }. \/* 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 */
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. _, u3 ?& Y6 N+ C! q) m( Z DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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};
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static struct gpio_led da850_evm_tl_leds[] = {: _4 D" _0 c S0 }/ N
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.active_low = 0,
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.gpio = DA850_USER_LED0,
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.name = "user_led0",# G) @( v- `8 }8 |: }* v
2 Y4 D/ t9 h# ^: }6 Q9 g .default_trigger = "default-on",
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.active_low = 0,
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.gpio = DA850_USER_LED1,
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; D* E& C7 E6 T5 r7 O1 I .name = "user_led1",! v2 [" {9 `/ e/ J, n
. v8 v0 [2 j1 M; q: d .default_trigger = "default-on",6 H$ y/ B7 K6 ^' K
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8 c/ v: z% W- z: e) D1 F .active_low = 0," S! `# F i) K2 W8 ]- W
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.gpio = DA850_USER_LED2,8 x5 x( ]8 S8 U
; m: S" o( s+ \- Z1 W& b/ I .name = "user_led2",
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4 P" s& }1 a' \ r .default_trigger = "default-on",8 O) d; T& f4 W( X/ U
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.active_low = 0,, h n) ^+ s4 T! x/ |% k
1 M; J9 s: m- f% z* u' x9 ^ T .gpio = DA850_USER_LED3,
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.name = "user_led3",
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; N) G4 i+ T* ?# n# e .default_trigger = "default-on",
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.active_low = 0,
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9 `8 Q3 Z# l5 j: Y7 g3 x/ B& J .gpio = DA850_USER_LED4,+ @9 ~' I5 k @, Z" D/ e- O
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.name = "user_led4",
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.default_trigger = "default-on",9 K9 R, S' m0 K
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{
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# ?+ Z. r" P0 j: a" m1 V" G .active_low = 0,
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.gpio = DA850_USER_LED5,
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% c7 Z3 o" j+ U2 B .name = "user_led5",
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, p3 I* |2 W5 Y* Q .default_trigger = "default-on",
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};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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2 B& D4 K6 n) I" E+ x .leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),5 A M0 i' g$ O: H
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};% y T" h' E/ h/ }; |) P" P
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static void led_dev_release(struct device *dev)& h- R }/ L& F# }0 X9 t i* \0 D
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( `: t+ d5 K2 H4 A7 j& L' Zstatic struct platform_device da850_evm_tl_leds_device = {* v8 `7 g& F$ U5 R
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.name = "leds-gpio",
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' i& u" r/ t1 L" a: C' O .id = 1,
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.dev = {
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.platform_data = &da850_evm_tl_leds_pdata,( q B9 E. h, J& `8 I! X
4 R6 d: q* L1 y/ X; W .release = led_dev_release," ]: w% s' t7 c% C" f, n
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5 T7 F4 h7 H* c3 s# n* V4 z2 xstatic int __init led_platform_init(void)
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{
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0 A8 o. k$ h/ f7 ? int ret;, u/ V% F+ h+ v; B* M6 ?
' L" ^4 D5 K, x#if 00 _* m, T, S/ D6 x% l' _
5 F9 z0 K3 H3 v) u" H- b2 Y ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"! b7 E" I6 `8 { o$ R- {* C( y
X* W; m( X+ E ^6 C. t "%d\n", ret);; G% z1 y" x' B& u2 R7 @
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#endif5 ^8 @+ M! k, i
- T7 `5 {! ~+ H" e$ g" h 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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else9 Z' a0 X0 _2 Q( {, n A8 i
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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static void __exit led_platform_exit(void)
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platform_device_unregister(&da850_evm_tl_leds_device);
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printk(KERN_INFO "LED unregister!\n");
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module_init(led_platform_init);
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. h1 H5 y B# ]module_exit(led_platform_exit);1 s8 z6 D9 u& U; f. a w
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7 Y: B4 H! ~, v# \# o% M$ uMODULE_DESCRIPTION("Led platform driver");
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& t" F5 k' D1 |9 R: V( J9 _MODULE_AUTHOR("Tronlong");8 Y. _# }- |- s/ z, X; B& x9 Q
0 V1 g* T2 \6 \MODULE_LICENSE("GPL"); |
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