patch-1.3.94 linux/drivers/char/atarimouse.c

• Lines: 214
• Date: Thu Apr 18 02:08:04 1996
• Orig file: v1.3.93/linux/drivers/char/atarimouse.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/drivers/char/atarimouse.c linux/drivers/char/atarimouse.c
@@ -0,0 +1,213 @@
+/*
+ * Atari Mouse Driver for Linux
+ * by Robert de Vries ([email protected]) 19Jul93
+ *
+ * 16 Nov 1994 Andreas Schwab
+ * Compatibility with busmouse
+ * Support for three button mouse (shamelessly stolen from MiNT)
+ * third button wired to one of the joystick directions on joystick 1
+ *
+ * 1996/02/11 Andreas Schwab
+ * Module support
+ * Allow multiple open's
+ */
+
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+
+#include <asm/atarikb.h>
+#include <asm/atari_mouse.h>
+#include <asm/segment.h>
+#include <asm/bootinfo.h>
+
+static struct mouse_status mouse;
+static int atari_mouse_x_threshold = 2, atari_mouse_y_threshold = 2;
+extern int atari_mouse_buttons;
+
+static void atari_mouse_interrupt(char *buf)
+{
+    int buttons;
+
+/*    ikbd_mouse_disable(); */
+
+    buttons = ((buf[0] & 1 ? 1 : 0)
+	       | (buf[0] & 2 ? 4 : 0)
+	       | (atari_mouse_buttons & 2));
+    atari_mouse_buttons = buttons;
+    add_mouse_randomness((buttons << 16) + (buf[2] << 8) + buf[1]);
+    mouse.buttons = ~buttons & 7;
+    mouse.dx += buf[1];
+    mouse.dy -= buf[2];
+    mouse.ready = 1;
+    wake_up_interruptible(&mouse.wait);
+    if (mouse.fasyncptr)
+	kill_fasync(mouse.fasyncptr, SIGIO);
+
+/*    ikbd_mouse_rel_pos(); */
+}
+
+static int fasync_mouse(struct inode *inode, struct file *filp, int on)
+{
+	int retval;
+
+	retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
+	if (retval < 0)
+		return retval;
+	return 0;
+}
+
+static void release_mouse(struct inode *inode, struct file *file)
+{
+    fasync_mouse(inode, file, 0);
+    if (--mouse.active)
+      return;
+    ikbd_mouse_disable();
+
+    atari_mouse_interrupt_hook = NULL;
+    MOD_DEC_USE_COUNT;
+}
+
+static int open_mouse(struct inode *inode, struct file *file)
+{
+    if (mouse.active++)
+	return 0;
+    mouse.ready = 0;
+    mouse.dx = mouse.dy = 0;
+    atari_mouse_buttons = 0;
+    ikbd_mouse_y0_top ();
+    ikbd_mouse_thresh (atari_mouse_x_threshold, atari_mouse_y_threshold);
+    ikbd_mouse_rel_pos();
+    MOD_INC_USE_COUNT;
+    atari_mouse_interrupt_hook = atari_mouse_interrupt;
+    return 0;
+}
+
+static int write_mouse(struct inode *inode, struct file *file, const char *buffer, int count)
+{
+    return -EINVAL;
+}
+
+static int read_mouse(struct inode *inode, struct file *file, char *buffer, int count)
+{
+    int dx, dy, buttons;
+    int r;
+
+    if (count < 3)
+	return -EINVAL;
+    if ((r = verify_area(VERIFY_WRITE, buffer, count)))
+	return r;
+    if (!mouse.ready)
+	return -EAGAIN;
+    /* ikbd_mouse_disable */
+    dx = mouse.dx;
+    dy = mouse.dy;
+    buttons = mouse.buttons;
+    if (dx > 127)
+      dx = 127;
+    else if (dx < -128)
+      dx = -128;
+    if (dy > 127)
+      dy = 127;
+    else if (dy < -128)
+      dy = -128;
+    mouse.dx -= dx;
+    mouse.dy -= dy;
+    if (mouse.dx == 0 && mouse.dy == 0)
+      mouse.ready = 0;
+    /* ikbd_mouse_rel_pos(); */
+    put_user(buttons | 0x80, buffer);
+    put_user((char) dx, buffer + 1);
+    put_user((char) dy, buffer + 2);
+    for (r = 3; r < count; r++)
+      put_user (0, buffer + r);
+    return r;
+}
+
+static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table *wait)
+{
+	if (sel_type == SEL_IN) {
+	    	if (mouse.ready)
+			return 1;
+		select_wait(&mouse.wait, wait);
+	}
+	return 0;
+}
+
+struct file_operations atari_mouse_fops = {
+    NULL,		/* mouse_seek */
+    read_mouse,
+    write_mouse,
+    NULL,		/* mouse_readdir */
+    mouse_select,
+    NULL,		/* mouse_ioctl */
+    NULL,		/* mouse_mmap */
+    open_mouse,
+    release_mouse,
+    NULL,
+    fasync_mouse,
+};
+
+static struct miscdevice atari_mouse = {
+    ATARIMOUSE_MINOR, "atarimouse", &atari_mouse_fops
+};
+
+int atari_mouse_init(void)
+{
+    mouse.active = 0;
+    mouse.ready = 0;
+    mouse.wait = NULL;
+
+    if (!MACH_IS_ATARI)
+	return -ENODEV;
+    printk(KERN_INFO "Atari mouse installed.\n");
+    misc_register(&atari_mouse);
+    return 0;
+}
+
+
+#define	MIN_THRESHOLD 1
+#define	MAX_THRESHOLD 20	/* more seems not reasonable... */
+
+void atari_mouse_setup( char *str, int *ints )
+{
+    if (ints[0] < 1) {
+	printk( "atari_mouse_setup: no arguments!\n" );
+	return;
+    }
+    else if (ints[0] > 2) {
+	printk( "atari_mouse_setup: too many arguments\n" );
+    }
+
+    if (ints[1] < MIN_THRESHOLD || ints[1] > MAX_THRESHOLD)
+	printk( "atari_mouse_setup: bad threshold value (ignored)\n" );
+    else {
+	atari_mouse_x_threshold = ints[1];
+	atari_mouse_y_threshold = ints[1];
+	if (ints[0] > 1) {
+	    if (ints[2] < MIN_THRESHOLD || ints[2] > MAX_THRESHOLD)
+		printk("atari_mouse_setup: bad threshold value (ignored)\n" );
+	    else
+		atari_mouse_y_threshold = ints[2];
+	}
+    }
+	
+}
+
+#ifdef MODULE
+#include <asm/bootinfo.h>
+
+int init_module(void)
+{
+	return atari_mouse_init();
+}
+
+void cleanup_module(void)
+{
+  misc_deregister(&atari_mouse);
+}
+#endif