S3C2410触摸屏问题
小弟最近在我的友善之臂2410开发板上想将其升级到2.6.14的kernel。前段时间费劲周折将kernel移植搞定了,现在在忙着移植一些驱动了。我的触摸屏是s3c2410的,在2.6.14的KERNEL源码树中是没有被包含的。
于是,我在网上找了一些资料,找到了牛人们贴出来的s3c2410触摸屏的驱动程序(参考http://www.cnitblog.com/luofuchong/archive/2007/08/22/32177.html)。我把它移植于我的开发板中,经过一些周折,可以正常RUN起来了,而且,当我触摸屏幕的时候,在超级终端中会打印出时间和X,Y坐标的值。然后,我想编一个应用程序去读驱动返回的坐标值,结果发现应用程序读到的坐标值和驱动程序里面(调试模式下)打印出来的坐标值不相同,验证过好多次都这样的。这是为什么呢,是我的驱动程序本身的问题,还是我写的应用程序的问题呢。希望大虾们能够指点指点啊,小弟已经弄这个小问题已经搞了好几天了,已经没有思路了。。。。。谢谢了!
这是终端打印出来的数据:
T: 440013, X: 533, Y: 623
value,x is: 124,y is: 194,dir is: 1
T: 445047, X: 530, Y: 625
value,x is: 124,y is: 195,dir is: 1
T: 455035, X: 534, Y: 643
value,x is: 125,y is: 199,dir is: 1
T: 460034, X: 535, Y: 643
value,x is: 125,y is: 200,dir is: 1
T: 465034, X: 534, Y: 635
value,x is: 125,y is: 200,dir is: 1
value,x is: 125,y is: 198,dir is: 1
value,x is: 125,y is: 198,dir is: 0
其中,T: 440013, X: 533, Y: 623是驱动程序打印出来的,value,x is: 124,y is: 194,dir is: 1是应用程序打印出来的。
以下是我的源码:
(1).我写的应用程序源码:ts_test.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#define TOUCHSCREEN "/dev/input/ts0"
struct TS_RET {
short pressure;
short x;
short y;
short millisecs;
};
int main()
{
int fd;
struct TS_RET buf;
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100;
fd = open(TOUCHSCREEN,O_RDONLY);
if( fd<0 )
{
printf("open TOUCHSCREEN error\n");
return -1;
}
while(1)
{
int ret;
fd_set set;
FD_ZERO(&set);
FD_SET(fd,&set);
ret = select(fd+1,&set,NULL,NULL,NULL);
if (ret < 0)
{
perror("select");
exit(1);
}
if (ret == 0)
{
printf("Timeout.\n");
}
else if (FD_ISSET(fd, &set))
{
int ret = read( fd,&buf,sizeof(struct TS_RET) );
if (ret != sizeof(struct TS_RET))
{
if (errno != EAGAIN)
perror("read TOUCHSCREEN\n");
continue;
}
else
{
printf("value,x is: %d,y is: %d,dir is: %d,time:%d\n", buf.x,buf.y,buf.pressure,buf.millisecs);
}
}
}
close(fd);
return 0;
}
(2)网上搜索到的S3C2410触摸屏驱动程序:s3c2410_ts.c
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/arch/regs-adc.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/s3c2410_ts.h>
#include <asm/hardware/clock.h>
/* For ts.dev.id.version */
#define S3C2410TSVERSION 0x0101
#define WAIT4INT(x) (((x)<<8) | S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_XY_PST(3))
#define AUTOPST (S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_AUTO_PST | S3C2410_ADCTSC_XY_PST(0))
//added by Yaopf, for debug
#define CONFIG_TOUCHSCREEN_S3C2410_DEBUG
//add end;
//#define DEBUG_LVL KERN_DEBUG
#define DEBUG_LVL KERN_ALERT
MODULE_AUTHOR("Arnaud Patard ");
MODULE_DESCRIPTION("s3c2410 touchscreen driver");
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
static char *s3c2410ts_name = "s3c2410 TouchScreen";
/*
* Per-touchscreen data.
*/
struct s3c2410ts {
struct input_dev dev;
long xp;
long yp;
int count;
int shift;
char phys[32];
};
static struct s3c2410ts ts;
static void __iomem *base_addr;
static inline void s3c2410_ts_connect(void)
{
s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);
s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
}
static void touch_timer_fire(unsigned long data)
{
unsigned long data0;
unsigned long data1;
int updown;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));
if (updown) {
if (ts.count != 0) {
ts.xp >>= ts.shift;
ts.yp >>= ts.shift;
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
{
struct timeval tv;
do_gettimeofday(&tv);
printk(DEBUG_LVL "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);
}
#endif
input_report_abs(&ts.dev, ABS_X, ts.xp);
input_report_abs(&ts.dev, ABS_Y, ts.yp);
input_report_key(&ts.dev, BTN_TOUCH, 1);
input_report_abs(&ts.dev, ABS_PRESSURE, 1);
input_sync(&ts.dev);
}
ts.xp = 0;
ts.yp = 0;
ts.count = 0;
writel((S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST), base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
}
else {
ts.count = 0;
input_report_key(&ts.dev, BTN_TOUCH, 0);
input_report_abs(&ts.dev, ABS_PRESSURE, 0);
input_sync(&ts.dev);
writel(WAIT4INT(0),base_addr+S3C2410_ADCTSC);
}
}
static struct timer_list touch_timer = TIMER_INITIALIZER(touch_timer_fire, 0, 0);
static irqreturn_t stylus_updown(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
int updown;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));
/* TODO we should never get an interrupt with updown set while
* the timer is running, but maybe we ought to verify that the
* timer isn't running anyways. */
if (updown)
touch_timer_fire(0);
return IRQ_HANDLED;
}
static irqreturn_t stylus_action(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;
ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;
ts.count++ ;
if (ts.count < (1<<ts.shift))
{
writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
}
else
{
mod_timer(&touch_timer, jiffies+1);
writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC);
}
return IRQ_HANDLED;
}
static struct clk *adc_clock;
/*
* The functions for inserting/removing us as a module.
*/
static int __init s3c2410ts_probe(struct device *dev)
{
struct s3c2410_ts_mach_info *info;
info = ( struct s3c2410_ts_mach_info *)dev->platform_data;
if (!info)
{
printk(KERN_ERR "Hm... too bad : no platform data for ts\n");
return -EINVAL;
}
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "Entering s3c2410ts_init\n");
#endif
adc_clock = clk_get(NULL, "adc");
if (!adc_clock)
{
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_use(adc_clock);
clk_enable(adc_clock);
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "got and enabled clock\n");
#endif
base_addr=ioremap(S3C2410_PA_ADC,0x20);
if (base_addr == NULL)
{
printk(KERN_ERR "Failed to remap register block\n");
return -ENOMEM;
}
/* Configure GPIOs */
s3c2410_ts_connect();
if ((info->presc&0xff) > 0)
writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),base_addr+S3C2410_ADCCON);
else
writel(0,base_addr+S3C2410_ADCCON);
/* Initialise registers */
if ((info->delay&0xffff) > 0)
writel(info->delay & 0xffff, base_addr+S3C2410_ADCDLY);
writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
/* Initialise input stuff */
memset(&ts, 0, sizeof(struct s3c2410ts));
init_input_dev(&ts.dev);
ts.dev.evbit[0] = ts.dev.evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
ts.dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(&ts.dev, ABS_X, 0, 0x3FF, 0, 0);
input_set_abs_params(&ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
input_set_abs_params(&ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
sprintf(ts.phys, "ts0");
ts.dev.private = &ts;
ts.dev.name = s3c2410ts_name;
ts.dev.phys = ts.phys;
ts.dev.id.bustype = BUS_RS232;
ts.dev.id.vendor = 0xDEAD;
ts.dev.id.product = 0xBEEF;
ts.dev.id.version = S3C2410TSVERSION;
ts.shift = info->oversampling_shift;
/* Get irqs */
if (request_irq(IRQ_ADC, stylus_action, SA_SAMPLE_RANDOM,"s3c2410_action", &ts.dev))
{
printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_ADC !\n");
iounmap(base_addr);
return -EIO;
}
if (request_irq(IRQ_TC, stylus_updown, SA_SAMPLE_RANDOM,"s3c2410_updown", &ts.dev))
{
printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");
iounmap(base_addr);
return -EIO;
}
printk(KERN_INFO "%s successfully loaded\n", s3c2410ts_name);
/* All went ok, so register to the input system */
input_register_device(&ts.dev);
return 0;
}
static int s3c2410ts_remove(struct device *dev)
{
disable_irq(IRQ_ADC);
disable_irq(IRQ_TC);
free_irq(IRQ_TC,&ts.dev);
free_irq(IRQ_ADC,&ts.dev);
if (adc_clock)
{
clk_disable(adc_clock);
clk_unuse(adc_clock);
clk_put(adc_clock);
adc_clock = NULL;
}
input_unregister_device(&ts.dev);
iounmap(base_addr);
return 0;
}
static struct device_driver s3c2410ts_driver = {
.name = "s3c2410-ts",
.bus = &platform_bus_type,
.probe = s3c2410ts_probe,
.remove = s3c2410ts_remove
};
int __init s3c2410ts_init(void)
{
return driver_register(&s3c2410ts_driver);
}
void __exit s3c2410ts_exit(void)
{
driver_unregister(&s3c2410ts_driver);
}
module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);
[ 本帖最后由 dreamice 于 2008-12-29 16:41 编辑 ]
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评论(2)
不懂,帮顶
应该是应用程序的问题.