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本文导语: 本帖最后由 wenxy1 于 2009-12-30 15:30:25 编辑 我用的华天正电子科技生产的RealARM开发板,移植他提供的linux系统(2.4.18)。里面带了触摸屏驱动,我想再加上ADC驱动。但是加了ADC驱动到内核后,触摸屏不能使用了,没有反...
我现在把我的驱动贴出来:
ADC驱动:
/*
* s3c2410-adc.c
*
* S3C2410 ADC
* exclusive with s3c2410-ts.c
*
* Author: SeonKon Choi
* Date : $Date: 2003/01/20 14:24:49 $
*
* $Revision: 1.1.2.6 $
*
2004-6-14 add a device by threewater
Fri Dec 03 2002 SeonKon Choi
- initial
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "s3c2410-adc.h"
#undef DEBUG
//#define DEBUG
#ifdef DEBUG
#define DPRINTK(x...) {printk(__FUNCTION__"(%d): ",__LINE__);printk(##x);}
#else
#define DPRINTK(x...) (void)(0)
#endif
#define DEVICE_NAME "s3c2410-adc"
#define ADCRAW_MINOR 1
static int adcMajor = 0;
typedef struct {
struct semaphore lock;
wait_queue_head_t wait;
int channel;
int prescale;
}ADC_DEV;
static ADC_DEV adcdev;
#define START_ADC_AIN(ch, prescale)
do{
ADCCON = PRESCALE_EN | PRSCVL(prescale) | ADC_INPUT((ch)) ;
ADCCON |= ADC_START;
}while(0)
static void adcdone_int_handler(int irq, void *dev_id, struct pt_regs *reg)
{
if(strcmp(dev_id,DEVICE_NAME)!=0)
return -1;
wake_up(&adcdev.wait);
}
static ssize_t s3c2410_adc_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
{
int data;
if(count!=sizeof(data)){
//error input data size
DPRINTK("the size of input data must be %dn", sizeof(data));
return 0;
}
copy_from_user(&data, buffer, count);
adcdev.channel=ADC_WRITE_GETCH(data);
adcdev.prescale=ADC_WRITE_GETPRE(data);
DPRINTK("set adc channel=%d, prescale=0x%xn", adcdev.channel, adcdev.prescale);
return count;
}
static ssize_t s3c2410_adc_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{
int ret = 0;
if (down_interruptible(&adcdev.lock))
return -ERESTARTSYS;
START_ADC_AIN(adcdev.channel, adcdev.prescale);
interruptible_sleep_on(&adcdev.wait);
ret = ADCDAT0;
ret &= 0x3ff;
DPRINTK("AIN[%d] = 0x%04x, %dn", adcdev.channel, ret, ADCCON & 0x80 ? 1:0);
copy_to_user(buffer, (char *)&ret, sizeof(ret));
up(&adcdev.lock);
return sizeof(ret);
}
static int s3c2410_adc_open(struct inode *inode, struct file *filp)
{
init_MUTEX(&adcdev.lock);
init_waitqueue_head(&(adcdev.wait));
adcdev.channel=0;
adcdev.prescale=0xff;
MOD_INC_USE_COUNT;
DPRINTK( "adc openedn");
return 0;
}
static int s3c2410_adc_release(struct inode *inode, struct file *filp)
{
MOD_DEC_USE_COUNT;
DPRINTK( "adc closedn");
return 0;
}
static struct file_operations s3c2410_fops = {
owner: THIS_MODULE,
open: s3c2410_adc_open,
read: s3c2410_adc_read,
write: s3c2410_adc_write,
release: s3c2410_adc_release,
};
#ifdef CONFIG_DEVFS_FS
static devfs_handle_t devfs_adc_dir, devfs_adcraw;
#endif
int __init s3c2410_adc_init(void)
{
int ret;
/* normal ADC */
ADCTSC = 0; //XP_PST(NOP_MODE);
ret = request_irq(IRQ_ADC_DONE, adcdone_int_handler, SA_SHIRQ, DEVICE_NAME, NULL);
if (ret) {
return ret;
}
ret = register_chrdev(0, DEVICE_NAME, &s3c2410_fops);
if (ret