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/*
* Atari Mouse Driver for Linux
* by Robert de Vries (robert@and.nl) 19Jul93
*
* 16 Nov 1994 Andreas Schwab
* Compatibility with busmouse
* Support for three button mouse (shamelessly stolen from MiNT)
* third button wired to one of the joystick directions on joystick 1
*
* 1996/02/11 Andreas Schwab
* Module support
* Allow multiple open's
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/atarikb.h>
#include <asm/atari_mouse.h>
#include <asm/uaccess.h>
static struct mouse_status mouse;
static int mouse_threshold[2] = {2,2};
MODULE_PARM(mouse_threshold, "2i");
extern int atari_mouse_buttons;
static void atari_mouse_interrupt(char *buf)
{
int buttons;
/* ikbd_mouse_disable(); */
buttons = ((buf[0] & 1 ? 1 : 0)
| (buf[0] & 2 ? 4 : 0)
| (atari_mouse_buttons & 2));
atari_mouse_buttons = buttons;
add_mouse_randomness((buttons << 16) + (buf[2] << 8) + buf[1]);
mouse.buttons = ~buttons & 7;
mouse.dx += buf[1];
mouse.dy -= buf[2];
mouse.ready = 1;
wake_up_interruptible(&mouse.wait);
if (mouse.fasyncptr)
kill_fasync(mouse.fasyncptr, SIGIO);
/* ikbd_mouse_rel_pos(); */
}
static int fasync_mouse(struct file *filp, int on)
{
int retval;
retval = fasync_helper(filp, on, &mouse.fasyncptr);
if (retval < 0)
return retval;
return 0;
}
static int release_mouse(struct inode *inode, struct file *file)
{
fasync_mouse(file, 0);
if (--mouse.active)
return 0;
ikbd_mouse_disable();
atari_mouse_interrupt_hook = NULL;
MOD_DEC_USE_COUNT;
return 0;
}
static int open_mouse(struct inode *inode, struct file *file)
{
if (mouse.active++)
return 0;
mouse.ready = 0;
mouse.dx = mouse.dy = 0;
atari_mouse_buttons = 0;
ikbd_mouse_y0_top ();
ikbd_mouse_thresh (mouse_threshold[0], mouse_threshold[1]);
ikbd_mouse_rel_pos();
MOD_INC_USE_COUNT;
atari_mouse_interrupt_hook = atari_mouse_interrupt;
return 0;
}
static long write_mouse(struct inode *inode, struct file *file,
const char *buffer, unsigned long count)
{
return -EINVAL;
}
static long read_mouse(struct inode *inode, struct file *file,
char *buffer, unsigned long count)
{
int dx, dy, buttons;
if (count < 3)
return -EINVAL;
if (!mouse.ready)
return -EAGAIN;
/* ikbd_mouse_disable */
dx = mouse.dx;
dy = mouse.dy;
buttons = mouse.buttons;
if (dx > 127)
dx = 127;
else if (dx < -128)
dx = -128;
if (dy > 127)
dy = 127;
else if (dy < -128)
dy = -128;
mouse.dx -= dx;
mouse.dy -= dy;
if (mouse.dx == 0 && mouse.dy == 0)
mouse.ready = 0;
/* ikbd_mouse_rel_pos(); */
if (put_user(buttons | 0x80, buffer++) ||
put_user((char) dx, buffer++) ||
put_user((char) dy, buffer++))
return -EFAULT;
if (count > 3)
if (clear_user(buffer, count - 3))
return -EFAULT;
return count;
}
static unsigned int mouse_poll(struct file *file, poll_table *wait)
{
poll_wait(&mouse.wait, wait);
if (mouse.ready)
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations atari_mouse_fops = {
NULL, /* mouse_seek */
read_mouse,
write_mouse,
NULL, /* mouse_readdir */
mouse_poll,
NULL, /* mouse_ioctl */
NULL, /* mouse_mmap */
open_mouse,
release_mouse,
NULL,
fasync_mouse,
};
static struct miscdevice atari_mouse = {
ATARIMOUSE_MINOR, "atarimouse", &atari_mouse_fops
};
__initfunc(int atari_mouse_init(void))
{
mouse.active = 0;
mouse.ready = 0;
mouse.wait = NULL;
if (!MACH_IS_ATARI)
return -ENODEV;
printk(KERN_INFO "Atari mouse installed.\n");
misc_register(&atari_mouse);
return 0;
}
#define MIN_THRESHOLD 1
#define MAX_THRESHOLD 20 /* more seems not reasonable... */
__initfunc(void atari_mouse_setup( char *str, int *ints ))
{
if (ints[0] < 1) {
printk( "atari_mouse_setup: no arguments!\n" );
return;
}
else if (ints[0] > 2) {
printk( "atari_mouse_setup: too many arguments\n" );
}
if (ints[1] < MIN_THRESHOLD || ints[1] > MAX_THRESHOLD)
printk( "atari_mouse_setup: bad threshold value (ignored)\n" );
else {
mouse_threshold[0] = ints[1];
mouse_threshold[1] = ints[1];
if (ints[0] > 1) {
if (ints[2] < MIN_THRESHOLD || ints[2] > MAX_THRESHOLD)
printk("atari_mouse_setup: bad threshold value (ignored)\n" );
else
mouse_threshold[1] = ints[2];
}
}
}
#ifdef MODULE
#include <asm/setup.h>
int init_module(void)
{
return atari_mouse_init();
}
void cleanup_module(void)
{
misc_deregister(&atari_mouse);
}
#endif
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