Hi all,
In the follow code, I try to get the bytes from the mouse, but the
bytes that I got are always either 0 or -128, in any state of mouse
(with or without pressed buttons).
I'm using COM1 and I read the bytes from the 0x3f8 port.
Am I reading the values from the correct address? Is there other way to do that?
I already had loaded the module and whenever
the mouse changes its state, I receive some bytes from serial, in the 0x3f8
address, but these bytes don't follow the mouse standard encoding.
I don't know what is the error.
Thanks.
--------------------------
#define MODULE
#define __KERNEL__
#include<linux/ioport.h>
#include <linux/config.h>
#include <linux/module.h>
#include<linux/sched.h>
#include<linux/poll.h>
#include<linux/interrupt.h>
#include<linux/miscdevice.h>
#include<linux/init.h>
#include <linux/kernel.h>
#include<linux/slab.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/fcntl.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/string.h>
#include <linux/unistd.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#define PORT 0x3f8 //COM1
#define LCR 3
#define MSB 1
#define LSB 0
#define FCR 2
#define SCR 7
#define OURMOUSE_BASE 0x300
#define OURMOUSE_MINOR 1
#define OURMOUSE_MAJOR 56
#define MOUSE_IRQ 4 //COM1
static int mouse_users = 0;
static int mouse_dx = 0;
static int mouse_dy = 0;
static int mouse_event = 0;
static int mouse_buttons = 0;
static int mouse_intr = MOUSE_IRQ;
static int interrupt_count=0;
static struct wait_queue *mouse_wait;
static spinlock_t mouse_lock = SPIN_LOCK_UNLOCKED;
static devfs_handle_t ourmouse_dir;
static devfs_handle_t ourmouse_dev;
static int ourmouse_open(struct inode *inode, struct file *file);
static int ourmouse_close(struct inode *inode,struct file *file);
static void ourmouse_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static unsigned int mouse_poll(struct file *file, poll_table *wait);
static int enable_irq_interrupt();
static int bufferin;
static int bufferout;
static char buffer[1024];
static unsigned interrupt_enabled = 0;
MODULE_LICENSE("GPL");
MODULE_AUTHOR("OURMOUSE");
char ourmouse_str[] = "Hi Baby!\n ";
ssize_t ourmouse_read(struct file *filp , char *buf,
size_t count, loff_t *offp)
{
struct inode *inode = filp->f_dentry->d_inode;
int minor = MINOR(inode->i_rdev);
char *txt;
if (filp->private_data) {
txt = filp->private_data;
} else {
txt = ourmouse_str;
}
if (count > strlen(txt)) count = strlen(txt);
copy_to_user(buf, txt, count);
*offp += count;
return count;
}
struct file_operations ourmouse_fops = {
read: ourmouse_read,
open: ourmouse_open,
release: ourmouse_close,
};
int init_module(void){
printk("<1> initing\n");
if(check_region(OURMOUSE_BASE, 3))
return -ENODEV;
request_region(OURMOUSE_BASE, 3,"Ourmouse");
devfs_register_chrdev(OURMOUSE_MAJOR,"Ourmouse",&ourmouse_fops);
ourmouse_dir = devfs_mk_dir(NULL,"Ourmouse", NULL);
if(ourmouse_dir == NULL){
printk("<1> Couldn't make the Ourmouse's dir\n");
}
ourmouse_dev = devfs_register(ourmouse_dir,
"Ourmouse",DEVFS_FL_NONE,OURMOUSE_MAJOR,OURMOUSE_MINOR, S_IFCHR |
S_IRUGO,&ourmouse_fops, NULL);
if (ourmouse_dev == NULL){
printk("<1> Couldn't register Ourmouse\n");
}
interrupt_enabled=!enable_irq_interrupt();
if (!interrupt_enabled)
return -EBUSY;
return 0;
}
void cleanup_module(void){
release_region(OURMOUSE_BASE, 3);
devfs_unregister(ourmouse_dev);
free_irq(mouse_intr, NULL);
printk("<1> Bye %i\n",interrupt_count);
}
static int ourmouse_open(struct inode *inode, struct file *file)
{
int err = 0;
if(mouse_users++)
return 0;
if(!interrupt_enabled)
{
mouse_users--;
return -EBUSY;
}
mouse_dx = 0;
mouse_dy = 0;
mouse_buttons = 0;
mouse_event = 0;
MOD_INC_USE_COUNT;
return 0;
}
static int ourmouse_close(struct inode *inode,struct file *file)
{
if(--mouse_users)
return 0;
MOD_DEC_USE_COUNT;
return 0;
}
static void ourmouse_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
//interrupt_count++;
int i;
do {
i = inb(PORT + 5);
if (i & 1) {
buffer[bufferin] = inb(PORT);
printk("<1> Byte %i: %i\n",bufferin,buffer[bufferin]);
bufferin++;
if (bufferin == 1024) bufferin = 0;
}
}while (i & 1);
}
static unsigned int mouse_poll(struct file *file, poll_table *wait)
{
return 0;
}
static int enable_irq_interrupt()
{
unsigned long flags;
int i;
bufferin = 0;
bufferout = 0;
save_flags(flags); cli();
i=request_irq(mouse_intr,ourmouse_interrupt,SA_INTERRUPT,"Ourmouse",NULL);
if(i) {
restore_flags(flags);
return i;
}
outb(0,PORT + 1); // Turn off interrupts - Port1
outb(0,PORT + 1); // Disable interrupts - bit 0 ->0
outb(0x80,PORT + 3); // enable DLAB - bit 7 ->1
outb(0x0C,PORT + 0); // Set Divisor LSB
outb(0x00,PORT + 1); // Set Divisor MSB
outb(0x03,PORT + 3); // 8 Bits, No Parity, 1 Stop Bit
outb(0xC7,PORT + 2); // Enable FIFO if UART is 16500+
outb(0x0B,PORT + 4); // Turn on DTR, RTS, and OUT2
outb(0x01,PORT + 1); // Interrupt when data received
printk("<1> sioEnable --ok ... irq: %d\n", mouse_intr);
restore_flags(flags);
return 0;
}
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