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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:
: o5 Z( W, p- R$ y8 q0 [: m#include <linux/module.h>9 C# c' V9 H0 M0 X5 a
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#include <linux/kernel.h>
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8 f3 V; }# c/ \$ u I#include <linux/types.h>. i, l0 E/ }$ ^) ]; h) s
; ?+ `) z* @2 i4 f#include <linux/gpio.h>
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# L4 {0 G( O8 I" ?" f#include <linux/leds.h>. B: \& u+ G0 Q
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>" v3 g, y/ P1 T
: q: N% p7 D+ R( ~#include <asm/mach/arch.h>' O- h. s! T; Q8 z
! E6 x4 k% ^; ~, G#include <mach/da8xx.h>4 {# r% U- ~. u$ |8 l+ ~$ Z; D
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#include <mach/mux.h>9 I5 d- p2 o' w; a" }% o( ?
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7 k; L; n5 d" W+ Q. d0 g& H; C#define DA850_USER_LED0 GPIO_TO_PIN(0, 0). N: {! w$ Y3 J2 j: K* {' U3 O
2 _2 u6 _% {! E#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)( R, X0 x* x5 A
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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& L- R5 a$ n `7 k- e; K#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)' p5 Y Q! Y! A5 _0 I" k
4 p9 P/ Q2 b2 u! H" {, W#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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, ~/ z) G' X7 J/* assign the tl som board LED-GPIOs*/0 ]/ G7 G, f. O
. |& p# @5 z2 \4 V2 g; `' tstatic const short da850_evm_tl_user_led_pins[] = {8 u/ |) P% V8 `( }/ E6 b d
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/* These pins are definition at <mach/mux.h> file */
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+ \& \* S/ Y+ R4 E$ A DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,5 V' O2 j3 \. E8 }6 W# S$ g: O
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-1
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8 L' J; n; a* ~$ a5 v/ `static struct gpio_led da850_evm_tl_leds[] = {9 C* F7 M) ]3 e! x9 M4 i$ ]' w: i
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% o [2 v/ B/ h) q7 @( `3 |5 o .active_low = 0,
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; E5 n$ v b3 v5 j& H3 P5 K: l .gpio = DA850_USER_LED0,5 T- Y" w) H6 k+ U0 b
$ j5 u) _+ Q3 v5 ~ .name = "user_led0",) i A( O7 N) ]' n1 H
* t: _- b' x6 z1 _ .default_trigger = "default-on",+ p, b) a3 u& r# v
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.active_low = 0,$ Q4 y% k+ S" ?$ b, g# {
9 W7 L! l8 T& g .gpio = DA850_USER_LED1,
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9 O# G! M8 r6 Z2 W1 J7 z .name = "user_led1",
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. Y: M6 Y* s" l1 O3 t) e7 c .default_trigger = "default-on",+ b* i- L0 Q' y& f# U
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.active_low = 0,* |. T# ^) b8 `* Q
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.gpio = DA850_USER_LED2,
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8 t7 h2 j7 k! M2 E+ Y$ F4 ? .name = "user_led2",# \! H) G* v4 M8 K% Z; [6 k9 ?: {
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.default_trigger = "default-on",4 ]' ]' _' P3 O9 O9 o5 Z
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{
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.active_low = 0,
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.gpio = DA850_USER_LED3,; t: v& B1 u: b
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.name = "user_led3",/ [: E4 S- B, A
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.default_trigger = "default-on",) a6 ~/ S/ k1 U+ a6 S
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{
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.active_low = 0,
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.gpio = DA850_USER_LED4,. k% H! O7 t: g. S! ? L1 V, J
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.name = "user_led4",
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6 q# V7 N7 G) ]5 {, E9 A .default_trigger = "default-on",& ~, G2 f7 E: E! \8 u) H
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( O0 @# [1 ?) c2 W .active_low = 0,/ ~% l8 P- V9 z8 R% p/ f
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.gpio = DA850_USER_LED5,
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.name = "user_led5",& C2 X% H" o! W# a1 f
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.default_trigger = "default-on",
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8 \) s" i; i9 ^/ b2 E1 G1 ystatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {1 Y& K" z8 h7 b3 t0 P$ M
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.leds = da850_evm_tl_leds,; s! q: q: p' `" X/ s0 Y' }& Z
: Q8 A* }2 }. t" @" M .num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)
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# ~5 \! S0 N1 s$ N! H, j% `1 P! W% \
& W, P: Y$ J2 ]: Istatic struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",5 ?- B( ^7 g2 h# X
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.id = 1,- G; u% h. K% a1 F. n7 e
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.platform_data = &da850_evm_tl_leds_pdata,
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" C8 G$ ?$ h S1 J& } .release = led_dev_release,
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}; _5 C4 I1 T1 u& |# Q: a
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};
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( Q; K: m( \/ e' m+ i8 I! t7 o, c. Ostatic int __init led_platform_init(void) F8 |3 F- U; D
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. G, s8 v% ~# _ O1 s9 v int ret;- Y2 D! D+ ]$ Z2 b+ y. a
9 A0 g, Y8 Z2 w" T#if 0; [: V. X$ t" N7 N7 l" i
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);) u- ^9 l/ i& }: p! A
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if (ret)
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% h; ]9 [) x9 z' _1 S. ` pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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) l8 z }8 s' H9 M, q+ L+ Y "%d\n", ret);! c- V$ t. p+ t/ [# W
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#endif, @: I! b$ E8 i) B, ]
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ret = platform_device_register(&da850_evm_tl_leds_device);
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if (ret)
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1 v5 A) g2 Z2 l |) C( D pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");4 [, b2 s6 ]* T& v( m
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return ret;" y6 H( E( G N8 I) ?0 p
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}
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% Z: V0 U; W9 b$ ?static void __exit led_platform_exit(void)0 Z5 l' i9 u& i5 U9 k/ i
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platform_device_unregister(&da850_evm_tl_leds_device);0 O6 Z& `1 A/ h S0 x
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printk(KERN_INFO "LED unregister!\n");2 [( j$ N1 Y$ L* f3 [4 C
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module_init(led_platform_init);' D4 d) u I# k; i
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module_exit(led_platform_exit);
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1 I1 W' q( F% r+ M, yMODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL"); |
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