Android驱动开发实例(控制LED灯)
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Android驱动例子（LED灯控制）
本例子，讲述在Android2.1上完全自已开发一个驱动去控制硬件口并写应用测试该驱动，通过这样一个例子，解析android下的驱动开发流程的应用调用流程，可以说是很好的入门引导
要达到的效果：通过Android的应用，调用驱动程序，在开发板上控制4个LED的亮灭。
一、硬件原理
如上图，通过4个IO口控制这LED，低电平LED亮，
这4个IO口分别是GPM1, GPM2, GPM3, GPM4,
二、驱动程序
1、在kernel文件夹下的driver目录，新键驱动文件夹
# cd kernel_Android_2.6.28.6/drivers
进到开发板的kernel目录，建驱动文件夹
#mkdir ledtest
2、在/driver/ledtest目录下，新建leddriver.c ，leddriver.h , Kconfig, Makefile 等4个文件leddriver.c
leddriver.c
1.#include
2.#include
3.#include
4.#include
5.#include
6.#include
7.#include
8.#include
9.#include
10.#include
11.#include
12.#include
13.#include
14.#include
15.#include
16.#include
17.#include
18.#include
19.#include
20.#include"leddriver.h"
21.#include
22.(WATCHDOG_MINOR) */
23.#include
24.#include
25.#define Viberator_MAJOR 97 //?÷éè±?o?
26.#define SCULL_NR_DEVS 4
27.#define SCULL_QUANTUM 4000
28.#define SCULL_QSET 1000
29.//---do as the GIO driver
30.#define DEVCOUNT 4
31.#define GIO_MINOR 2 /* GIO minor no. */
32.static dev_t dev; //éê ?? μ?μ??÷ éè±? o?
33.static struct cdev *cdev_p;
34.static int openCnt;
35.//--è±?á?------------
36.int VIB_major = 97;//we asigment it for test
37.int VIB_minor = 0;
38.int VIB_nr_devs = SCULL_NR_DEVS;
39.int VIB_quantum = SCULL_QUANTUM;
40.int VIB_qset = SCULL_QSET;
41.
42.static struct class *vib_dev_class;
43.#define GPNCON S3C64XX_GPNCON
44.#define GPNDAT S3C64XX_GPNDAT
45.#define GPNPUD S3C64XX_GPNPUD
46.#define GPMCON S3C64XX_GPMCON
47.#define GPMDAT S3C64XX_GPMDAT
48.#define GPMPUD S3C64XX_GPMPUD
49.
50.#define VIB_ON 0x11
51.#define VIB_OFF 0x22
52.static const struct file_operations GPIO_Viberator_ctl_ops={
53. .owner = THIS_MODULE,
54. .open = GPIO_VIB_open,
55. .read =GPIO_VIB_read,
56. .write =GPIO_VIB_write,
57. .ioctl = GPIO_VIB_ioctl,
58. .release =GPIO_VIB_release,
59.};
60.ssize_t GPIO_VIB_read(struct file * file,char * buf,size_t count,loff_t * f_op
s)
61.{
62. printk(" GPIO_VIB_read \r\n");
63. gpio_direction_output(S3C64XX_GPM(3), 0);//
64.return count ;
65.}
66.ssize_t GPIO_VIB_write (struct file * file,const char * buf, size_t count,loff
_t * f_ops)
67.{
68. printk(" GPIO_VIB_write \r\n");
69. gpio_direction_output(S3C64XX_GPM(3), 1);//
70.return count;
71.}
72.
73.//ssize_t GPIO_VIB_ioctl(struct inode * inode,struct file * file,unsigned int
cmd, long data)
74.static int GPIO_VIB_ioctl(struct inode *inode, struct file *file, unsigned int
cmd, unsigned long arg)
75.{
76. printk(KERN_ERR"VIB:GPIO_VIB_ioctl --CMD=%x \n",cmd);
77.switch(cmd)
78. {
79.case VIB_ON:
80. gpio_direction_output(S3C64XX_GPM(1), 0);//
81. gpio_direction_output(S3C64XX_GPM(2), 0);//
82. gpio_direction_output(S3C64XX_GPM(3), 0);//
83. gpio_direction_output(S3C64XX_GPM(4), 1);//
84. printk(KERN_ERR"VIB:GPIO_VIB_ioctl --VIB_ON\n");