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

• Lines: 341
• Date: Thu Apr 18 02:08:04 1996
• Orig file: v1.3.93/linux/drivers/char/amigamouse.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/drivers/char/amigamouse.c linux/drivers/char/amigamouse.c
@@ -0,0 +1,340 @@
+/*
+ * Amiga Mouse Driver for Linux 68k by Michael Rausch
+ * based upon:
+ *
+ * Logitech Bus Mouse Driver for Linux
+ * by James Banks
+ *
+ * Mods by Matthew Dillon
+ *   calls verify_area()
+ *   tracks better when X is busy or paging
+ *
+ * Heavily modified by David Giller
+ *   changed from queue- to counter- driven
+ *   hacked out a (probably incorrect) mouse_select
+ *
+ * Modified again by Nathan Laredo to interface with
+ *   0.96c-pl1 IRQ handling changes (13JUL92)
+ *   didn't bother touching select code.
+ *
+ * Modified the select() code blindly to conform to the VFS
+ *   requirements. 92.07.14 - Linus. Somebody should test it out.
+ *
+ * Modified by Johan Myreen to make room for other mice (9AUG92)
+ *   removed assignment chr_fops[10] = &mouse_fops; see mouse.c
+ *   renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public.
+ *   renamed this file mouse.c => busmouse.c
+ *
+ * Modfied for use in the 1.3 kernels by Jes Sorensen.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/random.h>
+
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/irq.h>
+#include <asm/amigamouse.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/bootinfo.h>
+
+#define MSE_INT_ON()	mouseint_allowed = 1
+#define MSE_INT_OFF()	mouseint_allowed = 0
+
+
+static struct mouse_status mouse;
+
+static int mouseint_allowed;
+
+static void mouse_interrupt(int irq, struct pt_regs *fp, void *dummy)
+{
+	static int lastx=0, lasty=0;
+	int dx, dy;
+	int nx, ny;
+	unsigned char buttons;
+
+	unsigned short joy0dat, potgor;
+
+	if(!mouseint_allowed)
+		return;
+	MSE_INT_OFF();
+
+	/*
+	 *  This routine assumes, just like Kickstart, that the mouse
+	 *  has not moved more than 127 ticks since last VBL.
+	 */
+
+	joy0dat = custom.joy0dat;
+
+	nx = joy0dat & 0xff;
+	ny = joy0dat >> 8;
+
+	dx = nx - lastx;
+	if (dx < - 127)
+		dx = (256 + nx) - lastx;
+
+	if (dx > 127)
+		dx = (nx - 256) - lastx;
+
+	dy = ny - lasty;
+	if (dy < - 127)
+		dy = (256 + ny) - lasty;
+
+	if (dy > 127)
+		dy = (ny - 256) - lasty;
+
+	lastx = nx;
+	lasty = ny;
+
+#if 0
+	dx = -lastdx;
+	dx += (lastdx = joy0dat & 0xff);
+	if (dx < -127)
+	    dx = -255-dx;		/* underrun */
+	else
+	if (dx > 127)
+	    dx = 255-dx;		/* overflow */
+
+	dy = -lastdy;
+	dy += (lastdy = joy0dat >> 8);
+	if (dy < -127)
+	    dy = -255-dy;
+	else
+	if (dy > 127)
+	    dy = 255-dy;
+#endif
+
+
+	potgor = custom.potgor;
+	buttons = (ciaa.pra & 0x40 ? 4 : 0) |	/* left button; note that the bits are low-active, as are the expected results -> double negation */
+#if 1
+		  (potgor & 0x0100 ? 2 : 0) |	/* middle button; emulation goes here */
+#endif
+		  (potgor & 0x0400 ? 1 : 0);	/* right button */
+
+
+	if (dx != 0 || dy != 0 || buttons != mouse.buttons) {
+	  add_mouse_randomness((buttons << 16) + (dy << 8) + dx);
+	  mouse.buttons = buttons;
+	  mouse.dx += dx;
+	  mouse.dy -= dy;
+	  mouse.ready = 1;
+	  wake_up_interruptible(&mouse.wait);
+
+	  /*
+	   * keep dx/dy reasonable, but still able to track when X (or
+	   * whatever) must page or is busy (i.e. long waits between
+	   * reads)
+	   */
+	  if (mouse.dx < -2048)
+	      mouse.dx = -2048;
+	  else
+	  if (mouse.dx >  2048)
+	      mouse.dx =  2048;
+
+	  if (mouse.dy < -2048)
+	      mouse.dy = -2048;
+	  else
+	  if (mouse.dy >  2048)
+	      mouse.dy =  2048;
+
+	  if (mouse.fasyncptr)
+	      kill_fasync(mouse.fasyncptr, SIGIO);
+	}
+	MSE_INT_ON();
+}
+
+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;
+}
+
+/*
+ * close access to the mouse
+ */
+
+static void close_mouse(struct inode * inode, struct file * file)
+{
+	fasync_mouse(inode, file, 0);
+	if (--mouse.active)
+	  return;
+	MSE_INT_OFF();
+	MOD_DEC_USE_COUNT;
+}
+
+/*
+ * open access to the mouse, currently only one open is
+ * allowed.
+ */
+
+static int open_mouse(struct inode * inode, struct file * file)
+{
+  if (!mouse.present)
+    return -EINVAL;
+  if (mouse.active++)
+    return 0;
+  mouse.ready = 0;
+  mouse.dx = 0;
+  mouse.dy = 0;
+  mouse.buttons = 0x87;
+  mouse.active = 1;
+  MOD_INC_USE_COUNT;
+  MSE_INT_ON();
+  return 0;
+}
+
+/*
+ * writes are disallowed
+ */
+
+static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)
+{
+	return -EINVAL;
+}
+
+/*
+ * read mouse data.  Currently never blocks.
+ */
+
+static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
+{
+	int r;
+	int dx;
+	int dy;
+	unsigned char buttons; 
+
+	if (count < 3)
+		return -EINVAL;
+	if ((r = verify_area(VERIFY_WRITE, buffer, count)))
+		return r;
+	if (!mouse.ready)
+		return -EAGAIN;
+
+	/*
+	 * Obtain the current mouse parameters and limit as appropriate for
+	 * the return data format.  Interrupts are only disabled while 
+	 * obtaining the parameters, NOT during the puts_fs_byte() calls,
+	 * so paging in put_fs_byte() does not effect mouse tracking.
+	 */
+
+	MSE_INT_OFF();
+	dx = mouse.dx;
+	dy = mouse.dy;
+	if (dx < -127)
+	    dx = -127;
+	else
+	if (dx > 127)
+	    dx = 127;
+	if (dy < -127)
+	    dy = -127;
+	else
+	if (dy > 127)
+	    dy = 127;
+	buttons = mouse.buttons;
+	mouse.dx -= dx;
+	mouse.dy -= dy;
+	mouse.ready = 0;
+	MSE_INT_ON();
+
+	put_fs_byte(buttons | 0x80, buffer);
+	put_fs_byte((char)dx, buffer + 1);
+	put_fs_byte((char)dy, buffer + 2);
+	for (r = 3; r < count; r++)
+	    put_fs_byte(0x00, buffer + r);
+	return r;
+}
+
+/*
+ * select for mouse input
+ */
+
+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 amiga_mouse_fops = {
+	NULL,		/* mouse_seek */
+	read_mouse,
+	write_mouse,
+	NULL, 		/* mouse_readdir */
+	mouse_select, 	/* mouse_select */
+	NULL, 		/* mouse_ioctl */
+	NULL,		/* mouse_mmap */
+	open_mouse,
+	close_mouse,
+	NULL,
+	fasync_mouse,
+};
+
+static struct miscdevice amiga_mouse = {
+	AMIGAMOUSE_MINOR, "amigamouse", &amiga_mouse_fops
+};
+
+int amiga_mouse_init(void)
+{
+	if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
+		return -ENODEV;
+
+	custom.joytest = 0;	/* reset counters */
+
+	MSE_INT_OFF();
+
+	mouse.active = 0;
+	mouse.ready = 0;
+	mouse.buttons = 0x87;
+	mouse.dx = 0;
+	mouse.dy = 0;
+	mouse.wait = NULL;
+
+	/*
+	 *  use VBL to poll mouse deltas
+	 */
+
+	if(!add_isr(IRQ_AMIGA_VERTB, mouse_interrupt, 0, NULL, "Amiga mouse"))
+	{
+		mouse.present = 0;
+		printk(KERN_INFO "Installing Amiga mouse failed.\n");
+		return -EIO;
+	}
+
+	mouse.present = 1;
+
+	printk(KERN_INFO "Amiga mouse installed.\n");
+	misc_register(&amiga_mouse);
+	return 0;
+}
+
+#ifdef MODULE
+#include <asm/bootinfo.h>
+
+int init_module(void)
+{
+	return amiga_mouse_init();
+}
+
+void cleanup_module(void)
+{
+  remove_isr(IRQ_AMIGA_VERTB, mouse_interrupt);
+  misc_deregister(&amiga_mouse);
+}
+#endif