/* * Microsoft busmouse driver based on Logitech driver (see busmouse.c) * * Microsoft BusMouse support by Teemu Rantanen (tvr@cs.hut.fi) (02AUG92) * * Microsoft Bus Mouse support modified by Derrick Cole (cole@concert.net) *    8/28/92 * * Microsoft Bus Mouse support folded into 0.97pl4 code *    by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92) * Changes:  Logitech and Microsoft support in the same kernel. *           Defined new constants in busmouse.h for MS mice. *           Added int mse_busmouse_type to distinguish busmouse types *           Added a couple of new functions to handle differences in using *             MS vs. Logitech (where the int variable wasn't appropriate). * * Modified by Peter Cervasio (address above) (26SEP92) * Changes:  Included code to (properly?) detect when a Microsoft mouse is *           really attached to the machine.  Don't know what this does to *           Logitech bus mice, but all it does is read ports. * * Modified by Christoph Niemann (niemann@rubdv15.etdv.ruhr-uni-bochum.de) * Changes:  Better interrupt-handler (like in busmouse.c). *	     Some changes to reduce code-size. *	     Changed dectection code to use inb_p() instead of doing empty *	     loops to delay i/o. * * version 0.3a */#include <linux/kernel.h>#include <linux/sched.h>#include <linux/busmouse.h>#include <linux/signal.h>#include <linux/errno.h>#include <asm/io.h>#include <asm/segment.h>#include <asm/system.h>#include <asm/irq.h>static struct mouse_status mouse;static void ms_mouse_interrupt(int unused){        char dx, dy;	unsigned char buttons;	outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);	outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);	outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);	dx = inb(MS_MSE_DATA_PORT);	outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);	dy = inb(MS_MSE_DATA_PORT);	outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);	buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;	outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);	outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);	if (dx != 0 || dy != 0 || buttons != mouse.buttons || ((~buttons) & 0x07)) {		mouse.buttons = buttons;		mouse.dx += dx;		mouse.dy += dy;		mouse.ready = 1;		wake_up_interruptible(&mouse.wait);	}}static void release_mouse(struct inode * inode, struct file * file){	MS_MSE_INT_OFF();	mouse.active = mouse.ready = 0; 	free_irq(MOUSE_IRQ);}static int open_mouse(struct inode * inode, struct file * file){	if (!mouse.present)		return -EINVAL;	if (mouse.active)		return -EBUSY;	mouse.active = 1;	mouse.ready = mouse.dx = mouse.dy = 0;		mouse.buttons = 0x80;	if (request_irq(MOUSE_IRQ, ms_mouse_interrupt)) {		mouse.active = 0;		return -EBUSY;	}	outb(MS_MSE_START, MS_MSE_CONTROL_PORT);	MS_MSE_INT_ON();		return 0;}static int write_mouse(struct inode * inode, struct file * file, char * buffer, int count){	return -EINVAL;}static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count){	int i, dx, dy;	if (count < 3)		return -EINVAL;	if (!mouse.ready)		return -EAGAIN;	put_fs_byte(mouse.buttons | 0x80, buffer);	dx = mouse.dx < -127 ? -127 : mouse.dx > 127 ?  127 :  mouse.dx;	dy = mouse.dy < -127 ?  127 : mouse.dy > 127 ? -127 : -mouse.dy;	put_fs_byte((char)dx, buffer + 1);	put_fs_byte((char)dy, buffer + 2);	for (i = 3; i < count; i++)		put_fs_byte(0x00, buffer + i);	mouse.dx -= dx;	mouse.dy += dy;	mouse.ready = 0;	return i;	}static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait){	if (sel_type != SEL_IN)		return 0;	if (mouse.ready) 		return 1;	select_wait(&mouse.wait,wait);	return 0;}struct file_operations ms_bus_mouse_fops = {	NULL,		/* mouse_seek */	read_mouse,	write_mouse,	NULL, 		/* mouse_readdir */	mouse_select, 	/* mouse_select */	NULL, 		/* mouse_ioctl */	NULL,		/* mouse_mmap */	open_mouse,	release_mouse,};unsigned long ms_bus_mouse_init(unsigned long kmem_start){	int mse_byte, i;	mouse.present = mouse.active = mouse.ready = 0;	mouse.buttons = 0x80;	mouse.dx = mouse.dy = 0;	mouse.wait = NULL;	if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {		mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);		for (i = 0; i < 4; i++) {			if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {				if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)					mouse.present = 1;				else					mouse.present = 0;			} else				mouse.present = 0;		}	}	if (mouse.present == 0) {		return kmem_start;	}	MS_MSE_INT_OFF();	printk("Microsoft BusMouse detected and installed.\n");	return kmem_start;}