Greetings-
In order to learn more about the device drivers on the Android platform, I
built an tutorial code and was able to interface with it from a user
program.
Here is the code I used for device driver:
/* Example Minimal Character Device Driver */
#include <linux/module.h>
static int __init hello_init(void)
{
printk("Hello Example Init\n");
return 0;
}
static void __exit hello_exit(void)
{
printk("Hello Example Exit\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_DESCRIPTION("Hello World Example");
MODULE_LICENSE("GPL");
Here is the code for the user space executable:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
int main(int argc, char **argv)
{
/* Our file descriptor */
int fd;
int rc = 0;
char *rd_buf[16];
printf("%s: entered\n", argv[0]);
/* Open the device */
fd = open("/dev/hello1", O_RDWR);
if ( fd == -1 ) {
perror("open failed");
rc = fd;
exit(-1);
}
printf("%s: open: successful\n", argv[0]);
/* Issue a read */
rc = read(fd, rd_buf, 0);
if ( rc == -1 ) {
perror("read failed");
close(fd);
exit(-1);
}
printf("%s: read: returning %d bytes!\n", argv[0], rc);
close(fd);
return 0;
}
***********************************************
Now I want to move this into an apk, and run it as an app. The only way I
know of doing this is via JNI. So I created a HelloJNI project using
another online tutorial. I need help with verifying I am on the right
track, and what are some of the next steps to get my user program code into
my JNI project and run it as an apk. I have already posted to a JNI forum,
but I have not heard anything back. I think doing kernel development is a
very unique skill, and that may be why other forums can not help me. I have
seen similar discussions on this list and have reviewed them to ensure I
provide all the information I should.
Thanks in Advance,
Sean
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