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/*
* Atari Joystick Driver for Linux
* by Robert de Vries (robert@and.nl) 19Jul93
*
* 16 Nov 1994 Andreas Schwab
* Support for three button mouse (shamelessly stolen from MiNT)
* third button wired to one of the joystick directions on joystick 1
*/
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/major.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/smp_lock.h>
#include <asm/atarikb.h>
#include <asm/atari_joystick.h>
#include <asm/uaccess.h>
#define MAJOR_NR JOYSTICK_MAJOR
#define ANALOG_JOY(n) (!(n & 0x80))
#define DIGITAL_JOY(n) (n & 0x80)
#define DEVICE_NR(n) (MINOR(n) & 0x7f)
static struct joystick_status joystick[2];
int atari_mouse_buttons; /* for three-button mouse */
void atari_joystick_interrupt(char *buf)
{
int j;
/* ikbd_joystick_disable(); */
j = buf[0] & 0x1;
joystick[j].dir = buf[1] & 0xF;
joystick[j].fire = (buf[1] & 0x80) >> 7;
joystick[j].ready = 1;
wake_up_interruptible(&joystick[j].wait);
/* For three-button mouse emulation fake a mouse packet */
if (atari_mouse_interrupt_hook &&
j == 1 && (buf[1] & 1) != ((atari_mouse_buttons & 2) >> 1))
{
char faked_packet[3];
atari_mouse_buttons = (atari_mouse_buttons & 5) | ((buf[1] & 1) << 1);
faked_packet[0] = (atari_mouse_buttons & 1) |
(atari_mouse_buttons & 4 ? 2 : 0);
faked_packet[1] = 0;
faked_packet[2] = 0;
atari_mouse_interrupt_hook (faked_packet);
}
/* ikbd_joystick_event_on(); */
}
static int release_joystick(struct inode *inode, struct file *file)
{
int minor = DEVICE_NR(inode->i_rdev);
lock_kernel();
joystick[minor].active = 0;
joystick[minor].ready = 0;
if ((joystick[0].active == 0) && (joystick[1].active == 0))
ikbd_joystick_disable();
unlock_kernel();
return 0;
}
static int open_joystick(struct inode *inode, struct file *file)
{
int minor = DEVICE_NR(inode->i_rdev);
if (!DIGITAL_JOY(inode->i_rdev) || minor > 1)
return -ENODEV;
if (joystick[minor].active)
return -EBUSY;
joystick[minor].active = 1;
joystick[minor].ready = 0;
ikbd_joystick_event_on();
return 0;
}
static ssize_t write_joystick(struct file *file, const char *buffer,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static ssize_t read_joystick(struct file *file, char *buffer, size_t count,
loff_t *ppos)
{
struct inode *inode = file->f_dentry->d_inode;
int minor = DEVICE_NR(inode->i_rdev);
if (count < 2)
return -EINVAL;
if (!joystick[minor].ready)
return -EAGAIN;
joystick[minor].ready = 0;
if (put_user(joystick[minor].fire, buffer++) ||
put_user(joystick[minor].dir, buffer++))
return -EFAULT;
if (count > 2)
if (clear_user(buffer, count - 2))
return -EFAULT;
return count;
}
static unsigned int joystick_poll(struct file *file, poll_table *wait)
{
int minor = DEVICE_NR(file->f_dentry->d_inode->i_rdev);
poll_wait(file, &joystick[minor].wait, wait);
if (joystick[minor].ready)
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations atari_joystick_fops = {
read: read_joystick,
write: write_joystick,
poll: joystick_poll,
open: open_joystick,
release: release_joystick,
};
int __init atari_joystick_init(void)
{
joystick[0].active = joystick[1].active = 0;
joystick[0].ready = joystick[1].ready = 0;
init_waitqueue_head(&joystick[0].wait);
init_waitqueue_head(&joystick[1].wait);
if (devfs_register_chrdev(MAJOR_NR, "Joystick", &atari_joystick_fops))
printk("unable to get major %d for joystick devices\n", MAJOR_NR);
devfs_register_series (NULL, "joysticks/digital%u", 2, DEVFS_FL_DEFAULT,
MAJOR_NR, 128, S_IFCHR | S_IRUSR | S_IWUSR,
&atari_joystick_fops, NULL);
return 0;
}
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