touch screen

Suhas,

You can use the API  input_report_abs() to report the touch panel co-ordinates. Refer to standard touch panel drivers available,

hey here is the problem in using input_report_abs(), its a driver function, i'm not able to call it frm my userspace application.... here is my user space app code...

#include <stdio.h>
#include <linux/types.h>
#include <fcntl.h>
#include <linux/input.h>


int main()

{

int fd;
unsigned char buf[12]={0};
int i=0;
unsigned short x,y,x1,x2,y1,y2;

while (1)
      {

       back:fd = open("/dev/hidraw0", O_RDONLY);
        if(fd < 0)
            {    
            printf("cant open /dev/hidraw0.....waiting for HID device...\n");    
            usleep(3*1000*1000);
            goto back;
            }
        
        read(fd, buf, sizeof(buf));
       
    
        x1 = buf[3];
        x2 = buf[4];
        x2 = x2 << 8;
        x= x2+x1;

        y1 = buf[5];
        y2 = buf[6];
        y2 = y2 << 8;
        y= y2+y1;
    
        printf("x=0x%X\t y=0x%X\n\n",x,y);
        close(fd);
        
      }

}

here is the output....

x=0x7D0  y=0x6BB
x=0x7D3  y=0x6AA

x=0x7CE  y=0x6AA

so i have my co-ordinates.. how can i use it with input_report_abs() , which is in touchscreen driver code ads7846.c

Suhas,

Why do you need a userspace touch screen driver, when you can easily manage with a kernel driver?

can any one explain how is the flow in hidraw.c driver..... i want to know the sequence of events that happens in this driver when we receive data through a hidraw device.....

i want to know in which variable(buffer) will the data recevied from hid device willl be stored??? i want to print that buffer to make sure im receiving right data and go on with further processing on it....

i think the received data is stored in the following buffer...but not sure . pls help me...... 

1. hid_get_raw_report(dev, report_number, buf, count, report_type) which is called in the function

 hidraw_get_report()

im i right....??????? pls help..