patch-1.3.94 linux/arch/m68k/atari/joystick.c

• Lines: 142
• Date: Sat Mar 30 14:11:04 1996
• Orig file: v1.3.93/linux/arch/m68k/atari/joystick.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/atari/joystick.c linux/arch/m68k/atari/joystick.c
@@ -0,0 +1,141 @@
+/*
+ * 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 <asm/atarikb.h>
+#include <asm/atari_joystick.h>
+#include <asm/atari_mouse.h>
+#include <asm/segment.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 void release_joystick(struct inode *inode, struct file *file)
+{
+    int minor = DEVICE_NR(inode->i_rdev);
+
+    joystick[minor].active = 0;
+    joystick[minor].ready = 0;
+
+    if ((joystick[0].active == 0) && (joystick[1].active == 0))
+	ikbd_joystick_disable();
+}
+
+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 int write_joystick(struct inode *inode, struct file *file,
+			  const char *buffer, int count)
+{
+    return -EINVAL;
+}
+
+static int read_joystick(struct inode *inode, struct file *file,
+			 char *buffer, int count)
+{
+    int minor = DEVICE_NR(inode->i_rdev);
+    int i;
+
+    if (count < 2)
+	return -EINVAL;
+    if (!joystick[minor].ready)
+	return -EAGAIN;
+    put_user(joystick[minor].fire, buffer++);
+    put_user(joystick[minor].dir, buffer++);
+    for (i = 0; i < count; i++)
+	put_user(0, buffer++);
+    joystick[minor].ready = 0;
+
+    return i;
+}
+
+static int joystick_select(struct inode *inode, struct file *file, int sel_type, select_table *wait)
+{
+    int minor = DEVICE_NR(inode->i_rdev);
+
+    if (sel_type != SEL_IN)
+	return 0;
+    if (joystick[minor].ready)
+	return 1;
+    select_wait(&joystick[minor].wait, wait);
+    return 0;
+}
+
+struct file_operations atari_joystick_fops = {
+	NULL,		/* joystick_seek */
+	read_joystick,
+	write_joystick,
+	NULL,		/* joystick_readdir */
+	joystick_select,
+	NULL,		/* joystick_ioctl */
+	NULL,		/* joystick_mmap */
+	open_joystick,
+	release_joystick
+};
+
+int atari_joystick_init(void)
+{
+    joystick[0].active = joystick[1].active = 0;
+    joystick[0].ready = joystick[1].ready = 0;
+    joystick[0].wait = joystick[1].wait = NULL;
+
+    if (register_chrdev(MAJOR_NR, "joystick", &atari_joystick_fops))
+	printk("unable to get major %d for joystick devices\n", MAJOR_NR);
+
+    return 0;
+}