/* * 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;}