?? joystick.c
字號:
/* * 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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