1/* 2 * Atari Joystick Driver for Linux 3 * by Robert de Vries (robert@and.nl) 19Jul93 4 * 5 * 16 Nov 1994 Andreas Schwab 6 * Support for three button mouse (shamelessly stolen from MiNT) 7 * third button wired to one of the joystick directions on joystick 1 8 */ 9 10#include <linux/sched.h> 11#include <linux/errno.h> 12#include <linux/major.h> 13#include <linux/poll.h> 14#include <linux/init.h> 15#include <linux/devfs_fs_kernel.h> 16#include <linux/smp_lock.h> 17 18#include <asm/atarikb.h> 19#include <asm/atari_joystick.h> 20#include <asm/uaccess.h> 21 22#define MAJOR_NR JOYSTICK_MAJOR 23 24#define ANALOG_JOY(n) (!(n & 0x80)) 25#define DIGITAL_JOY(n) (n & 0x80) 26#define DEVICE_NR(n) (MINOR(n) & 0x7f) 27 28 29static struct joystick_status joystick[2]; 30int atari_mouse_buttons; /* for three-button mouse */ 31 32void atari_joystick_interrupt(char *buf) 33{ 34 int j; 35/* ikbd_joystick_disable(); */ 36 37 j = buf[0] & 0x1; 38 joystick[j].dir = buf[1] & 0xF; 39 joystick[j].fire = (buf[1] & 0x80) >> 7; 40 joystick[j].ready = 1; 41 wake_up_interruptible(&joystick[j].wait); 42 43 /* For three-button mouse emulation fake a mouse packet */ 44 if (atari_mouse_interrupt_hook && 45 j == 1 && (buf[1] & 1) != ((atari_mouse_buttons & 2) >> 1)) 46 { 47 char faked_packet[3]; 48 49 atari_mouse_buttons = (atari_mouse_buttons & 5) | ((buf[1] & 1) << 1); 50 faked_packet[0] = (atari_mouse_buttons & 1) | 51 (atari_mouse_buttons & 4 ? 2 : 0); 52 faked_packet[1] = 0; 53 faked_packet[2] = 0; 54 atari_mouse_interrupt_hook (faked_packet); 55 } 56 57/* ikbd_joystick_event_on(); */ 58} 59 60static int release_joystick(struct inode *inode, struct file *file) 61{ 62 int minor = DEVICE_NR(inode->i_rdev); 63 64 lock_kernel(); 65 joystick[minor].active = 0; 66 joystick[minor].ready = 0; 67 68 if ((joystick[0].active == 0) && (joystick[1].active == 0)) 69 ikbd_joystick_disable(); 70 unlock_kernel(); 71 return 0; 72} 73 74static int open_joystick(struct inode *inode, struct file *file) 75{ 76 int minor = DEVICE_NR(inode->i_rdev); 77 78 if (!DIGITAL_JOY(inode->i_rdev) || minor > 1) 79 return -ENODEV; 80 if (joystick[minor].active) 81 return -EBUSY; 82 joystick[minor].active = 1; 83 joystick[minor].ready = 0; 84 ikbd_joystick_event_on(); 85 return 0; 86} 87 88static ssize_t write_joystick(struct file *file, const char *buffer, 89 size_t count, loff_t *ppos) 90{ 91 return -EINVAL; 92} 93 94static ssize_t read_joystick(struct file *file, char *buffer, size_t count, 95 loff_t *ppos) 96{ 97 struct inode *inode = file->f_dentry->d_inode; 98 int minor = DEVICE_NR(inode->i_rdev); 99 100 if (count < 2) 101 return -EINVAL; 102 if (!joystick[minor].ready) 103 return -EAGAIN; 104 joystick[minor].ready = 0; 105 if (put_user(joystick[minor].fire, buffer++) || 106 put_user(joystick[minor].dir, buffer++)) 107 return -EFAULT; 108 if (count > 2) 109 if (clear_user(buffer, count - 2)) 110 return -EFAULT; 111 return count; 112} 113 114static unsigned int joystick_poll(struct file *file, poll_table *wait) 115{ 116 int minor = DEVICE_NR(file->f_dentry->d_inode->i_rdev); 117 118 poll_wait(file, &joystick[minor].wait, wait); 119 if (joystick[minor].ready) 120 return POLLIN | POLLRDNORM; 121 return 0; 122} 123 124struct file_operations atari_joystick_fops = { 125 read: read_joystick, 126 write: write_joystick, 127 poll: joystick_poll, 128 open: open_joystick, 129 release: release_joystick, 130}; 131 132int __init atari_joystick_init(void) 133{ 134 joystick[0].active = joystick[1].active = 0; 135 joystick[0].ready = joystick[1].ready = 0; 136 init_waitqueue_head(&joystick[0].wait); 137 init_waitqueue_head(&joystick[1].wait); 138 139 if (devfs_register_chrdev(MAJOR_NR, "Joystick", &atari_joystick_fops)) 140 printk("unable to get major %d for joystick devices\n", MAJOR_NR); 141 devfs_register_series (NULL, "joysticks/digital%u", 2, DEVFS_FL_DEFAULT, 142 MAJOR_NR, 128, S_IFCHR | S_IRUSR | S_IWUSR, 143 &atari_joystick_fops, NULL); 144 145 return 0; 146} 147