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/*
* 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 detection 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, 0, "MS Busmouse")) {
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;
}
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