7279键盘驱动程序

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#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/ioport.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/smp_lock.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/timer.h>

#include <linux/list.h>

#include <linux/interrupt.h>

#include <linux/poll.h>

#include <linux/platform_device.h>

#include <linux/vmalloc.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <linux/irq.h>

#include <asm/system.h>

#include <asm/unaligned.h>

#include <asm/dma.h>

#include <linux/cdev.h>

#include <linux/device.h>

#include <linux/miscdevice.h>

#include <linux/poll.h>

#include <asm/arch/io.h>

#include <asm/arch/irqs.h>

#include <asm/arch/regs-gpio.h>

#include <asm/arch/regs-mem.h>

MODULE_LICENSE("Dual BSD/GPL");

/*************************************************************************/

#define cmd_reset 0xa4

#define cmd_test 0xbf

#define cmd_read 0x15

#define decode1 0xc8

#define key7279_base 0x20000004

static void __iomem *base_addr;

#define base_key7279 base_addr

/*************************************************************************/

void short_delay (void);

void long_delay(void);

unsigned char read7279(void);

void write7279(unsigned char,unsigned char);

void send_byte(unsigned char);

unsigned char receive_byte(void);

static struct class *Key7279_class;

/*************************************************************************/

--HD7279A鐨勬暟鎹槸閫氳繃CPLD浣滀负涓嶴3C241O閫氳鐨勬帴鍙ｏ紝CPU閫氳繃鍦ㄧ浉搴斿湴鍧€涓婄殑璇诲啓CPLD锛屽嵆鍙笌HD7279

杩涜鏈夋晥鐨勯€氳銆傜敱浜嶤PLD鏄€氳繃CPU鐨凬GCS4閫夋嫨鐨勶紝鎵€浠ュ悜CPLD璇诲啓鍧囬渶瑕佷娇鐢∟GCS4銆備笅闈负鍏蜂綋鐨?

浣跨敤鏂规硶銆?

--鍚戝湴鍧€ 0x20000004 閲屽啓0x01锛岃〃绀洪€変腑HD7279锛屽嵆CS7279='0

--浠庡湴鍧€ 0x20000004 涓啓0x02锛岃〃绀烘湭閫変腑HD7279锛屽嵆CS7279='1

--鍚戝湴鍧€ 0x20000004 閲屽啓0x05锛岃〃绀烘暟鎹祦浠嶤PLD鍒癏D7279

--浠庡湴鍧€ 0x20000004 涓啓0x06锛岃〃绀烘暟鎹祦浠嶩D7279鍒癈PLD

#define clrcs1 __raw_writel(0x01,base_key7279) /* CS 鏈夋晥 */

#define setcs1 __raw_writel(0x02,base_key7279) /* CS 鏃犳晥 */

#define s_clr __raw_writel(0x05,base_key7279) /* DATA PIN 鏂瑰悜涓鸿緭鍏?*/

#define s_set __raw_writel(0x06,base_key7279) /* DATA PIN 鏂瑰悜涓鸿緭鍑?*/

#define IRQ_HD7279_ini s3c2410_gpio_cfgpin(S3C2410_GPF5,S3C2410_GPF5_EINT5);

#define clrclk s3c2410_gpio_setpin(S3C2410_GPE13,0)

#define setclk s3c2410_gpio_setpin(S3C2410_GPE13,1)

#define clrdat s3c2410_gpio_setpin(S3C2410_GPE12,0)

#define setdat s3c2410_gpio_setpin(S3C2410_GPE12,1)

#define HD7279_DAT s3c2410_gpio_getpin(S3C2410_GPE12)

/*************************************************************************/

#define KEYBOARD_MAJOR 50

#define Key7279_GETKEY 0

int KeyValue;

int key_isopen;

unsigned char key_buf = 0xff;

/************************************************************************

- 鍑芥暟鍚嶇О : void long_delay(void)

- 鍑芥暟璇存槑 : 闀垮欢鏃剁▼搴?

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 鏃?

*************************************************************************/

void long_delay(void)

{

unsigned char i;

for (i=0;i<250;i++)

{

}

/************************************************************************

- 鍑芥暟鍚嶇О : void short_delay(void)

- 鍑芥暟璇存槑 : 鐭欢鏃剁▼搴?

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 鏃?

*************************************************************************/

void short_delay(void)

{

int i;

for(i=0;i<150;i++)

{

}

/************************************************************************

- 鍑芥暟鍚嶇О : Key7279_Close

- 鍑芥暟璇存槑 : 鍏抽棴閿洏璁惧

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 0

*************************************************************************/

static int Key7279_Close(struct inode * inode, struct file * file)

{

printk("Close successful/n");

key_isopen = 0;

return 0;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Key7279_Open

- 鍑芥暟璇存槑 : 鎵撳紑閿洏璁惧

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 0

************************************************************************/

static int Key7279_Open(struct inode * inode, struct file * file)

{

printk("Open successful/n");

key_isopen++;

return 0;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Key7279_Read

- 鍑芥暟璇存槑 : 鎵撳紑閿洏璁惧

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 0

************************************************************************/

static int Key7279_Read(struct file *fp, char *buf, size_t count)

{

put_user(key_buf, buf);

key_buf = 0xff;

return 1;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Key7279_getkey

- 鍑芥暟璇存槑 : 鑾峰彇涓€涓敭鍊?

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : -1

************************************************************************/

static int key7279_getkey(void)

{

int i,j;

//enable_irq(49);

KeyValue = 0xff;

for (i=0;i<3000;i++)

for (j=0;j<900;j++);

return KeyValue; /* 濡傛灉鏈夋寜閿寜涓嬶紝杩斿洖閿€?*/

}

/***********************************************************************

- 鍑芥暟鍚嶇О : void send_byte(unsigned char out_byte )

- 鍑芥暟璇存槑 : 鍚?279鍙戦€佷竴涓瓧鑺傜殑绋嬪簭

- 杈撳叆鍙傛暟 : out_byte

- 杈撳嚭鍙傛暟 : 鏃?

************************************************************************/

void send_byte(unsigned char out_byte )

{

unsigned short i;

clrcs1;

s_clr;

s3c2410_gpio_cfgpin(S3C2410_GPE12,S3C2410_GPE12_OUTP);

long_delay();

short_delay();

for (i=0;i<8;i++)

{

if (0x80 == (out_byte & 0x80)) setdat;

elseclrdat;

setclk;

short_delay();

clrclk;

short_delay();

out_byte <<= 1;

}

short_delay();

clrdat;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : unsigned char receive_byte (void)

- 鍑芥暟璇存槑 : 鍚?279鎺ユ敹涓€涓瓧鑺傜殑绋嬪簭

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : in_byte

************************************************************************/

unsigned char receive_byte (void)

{

unsigned char i,in_byte=0;

s_set;

s3c2410_gpio_cfgpin(S3C2410_GPE12,S3C2410_GPE12_INP);

long_delay();

for(i=0;i<8;i++)

{

setclk;

short_delay();

in_byte <<= 1;

if (HD7279_DAT)

in_byte |= 1;

clrclk;

short_delay();

}

s_clr;

clrdat;

s3c2410_gpio_cfgpin(S3C2410_GPE12,S3C2410_GPE12_OUTP);

short_delay();

printk("Get a Key %x/r/n",in_byte);

return(in_byte);

}

/***********************************************************************

- 鍑芥暟鍚嶇О : unsigned char read7279(unsigned char comand)

- 鍑芥暟璇存槑 : 璇婚敭鐩樻寚浠ょ▼搴?

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : in_byte

************************************************************************/

static unsigned char read7279(void)

{

send_byte(cmd_read);

return (receive_byte());

}

/***********************************************************************

- 鍑芥暟鍚嶇О : void write7279 (unsigned char cmd, unsigned char dat)

- 鍑芥暟璇存槑 : 鍐欓敭鐩樻寚浠ょ▼搴?

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : in_byte

************************************************************************/

void write7279 (unsigned char cmd, unsigned char dat)

{

send_byte(cmd);

send_byte(dat);

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Key7279_ISR

- 鍑芥暟璇存槑 : 閿洏鏈嶅姟瀛愮▼搴?

- 杈撳叆鍙傛暟 : irq,dev_id,regs

- 杈撳嚭鍙傛暟 : -1

************************************************************************/

static irqreturn_t Key7279_ISR(int irq,void* dev_id)

{

int i;

disable_irq(49);

for(i=0;i<100;i++);

KeyValue = read7279();

switch (KeyValue)

{

case 0:

KeyValue = 0x00;

break;

case 1:

KeyValue = 0x01;

break;

case 2:

KeyValue = 0x02;

break;

case 3:

KeyValue = 0x03;

break;

case 8:

KeyValue = 0x04;

break;

case 9:

KeyValue = 0x5;

break;

case 10:

KeyValue = 0x06;

break;

case 11:

KeyValue = 0x07;

break;

case 4:

KeyValue = 0x08;

break;

case 5:

KeyValue = 0x09;

break;

case 6:

KeyValue = 0x0a;

break;

case 7:

KeyValue = 0x0b;

break;

case 12:

KeyValue = 0xc;

break;

case 13:

KeyValue = 0x0d;

break;

case 14:

KeyValue = 0x0e;

break;

case 15:

KeyValue = 0x0f;

break;

default:

break;

}

write7279(decode1+4,KeyValue % 16);

write7279(decode1+5,KeyValue / 16);

key_buf = (unsigned char)KeyValue;

printk("KeyValue = %d/n",KeyValue);

enable_irq(49);

return IRQ_HANDLED;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Setup_Key7279

- 鍑芥暟璇存槑 : 閿洏璁惧鐨勭‖浠跺垵濮嬪寲鍑芥暟

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 鏃?

************************************************************************/

void Setup_Key7279(void)

{

int i,value;

value=__raw_readl(S3C2410_BWSCON); /* set the bank4 databus is 8 bitwidth */

value=value&(~(3<<16));

__raw_writel(value,S3C2410_BWSCON);

printk("set_up/n");

IRQ_HD7279_ini;

set_irq_type(49 , IRQT_FALLING); /* set falling edge triger */

s3c2410_gpio_pullup(S3C2410_GPE12,0);

s3c2410_gpio_pullup(S3C2410_GPE13,0);

s3c2410_gpio_pullup(S3C2410_GPF5,0);

s3c2410_gpio_cfgpin(S3C2410_GPE13,S3C2410_GPE13_OUTP);

send_byte(cmd_reset);

setcs1;

enable_irq(49);

printk("setup /n");

for(i=0;i<1000;i++);

write7279(decode1+3,0xf);

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Key7279_Ioctl

- 鍑芥暟璇存槑 : 閿洏鎺у埗

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 0

************************************************************************/

static int Key7279_Ioctl(struct inode *inode,struct file *file,unsigned int cmd, unsigned long arg)

{

switch(cmd)

{

case Key7279_GETKEY:

return key7279_getkey();

default:

printk("Unkown Keyboard Command ID./n");

}

return 0;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : struct file_operations Key7279_fops

- 鍑芥暟璇存槑 : 鏂囦欢缁撴瀯

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 鏃?

************************************************************************/

struct file_operations Key7279_fops =

{

.open = Key7279_Open,

.ioctl = Key7279_Ioctl,

.release = Key7279_Close,

.read = Key7279_Read,

};

/***********************************************************************

- 鍑芥暟鍚嶇О : int Key7279Init(void)

- 鍑芥暟璇存槑 : 娉ㄥ唽閿洏璁惧锛岃皟鐢ㄥ垵濮嬪寲鍑芥暟

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : -1

************************************************************************/

int __init Key7279_Init(void)

{

int result;

base_addr = ioremap(key7279_base,4);

printk("/n Registering Keyboard Device/t--- >/t");

result = register_chrdev(KEYBOARD_MAJOR, "Key7279", &Key7279_fops);//脳垄虏谩脡猫卤啪

if (result<0)

{

printk(KERN_INFO"[FALLED: Cannot register Key7279_driver!]/n");

return result;

}

else

printk("[OK]/n");

printk("Initializing Key7279 Device/t--- >/t");

Setup_Key7279();

if (request_irq(49,Key7279_ISR,0,"Key7279","88"))

{

printk(KERN_INFO"[FALLED: Cannot register Key7279_Interrupt!]/n");

return -EBUSY;

}

else

printk("[OK]/n");

printk("Key7279 Driver Installed./n");

Key7279_class=class_create(THIS_MODULE,"Key7279");

class_device_create(Key7279_class,NULL,MKDEV(KEYBOARD_MAJOR,0),NULL,"key7279");

return 0;

}

/***********************************************************************

- 鍑芥暟鍚嶇О : Kbd7279_Close

- 鍑芥暟璇存槑 : 鍏抽棴閿洏璁惧

- 杈撳叆鍙傛暟 : 鏃?

- 杈撳嚭鍙傛暟 : 0

************************************************************************/

void __exit Key7279_Exit(void)

{

unregister_chrdev(KEYBOARD_MAJOR, "Key7279");

free_irq(49,"88");

class_device_destroy(Key7279_class,MKDEV(KEYBOARD_MAJOR,0));

class_destroy(Key7279_class);

printk("You have uninstall The Key7279 Driver succesfully,/n if you want to install again,please use the insmod command /n");

}

module_init(Key7279_Init);

module_exit(Key7279_Exit);