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/*
* 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
*/
#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 int mouse_irq = MOUSE_IRQ;
void bmouse_setup(char *str, int *ints)
{
if (ints[0] > 0)
mouse_irq=ints[1];
}
static void mouse_interrupt(int unused)
{
char dx, dy;
unsigned char buttons;
MSE_INT_OFF();
outb(MSE_READ_X_LOW, MSE_CONTROL_PORT);
dx = (inb(MSE_DATA_PORT) & 0xf);
outb(MSE_READ_X_HIGH, MSE_CONTROL_PORT);
dx |= (inb(MSE_DATA_PORT) & 0xf) << 4;
outb(MSE_READ_Y_LOW, MSE_CONTROL_PORT );
dy = (inb(MSE_DATA_PORT) & 0xf);
outb(MSE_READ_Y_HIGH, MSE_CONTROL_PORT);
buttons = inb(MSE_DATA_PORT);
dy |= (buttons & 0xf) << 4;
buttons = ((buttons >> 5) & 0x07);
if (dx != 0 || dy != 0 || buttons != mouse.buttons) {
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;
if (mouse.dx > 2048)
mouse.dx = 2048;
if (mouse.dy < -2048)
mouse.dy = -2048;
if (mouse.dy > 2048)
mouse.dy = 2048;
}
MSE_INT_ON();
}
/*
* close access to the mouse (can deal with multiple
* opens if allowed in the future)
*/
static void close_mouse(struct inode * inode, struct file * file)
{
if (--mouse.active == 0) {
MSE_INT_OFF();
free_irq(mouse_irq);
}
}
/*
* 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 -EBUSY;
mouse.ready = 0;
mouse.dx = 0;
mouse.dy = 0;
mouse.buttons = 0x87;
if (request_irq(mouse_irq, mouse_interrupt, 0, "Busmouse"))
return -EBUSY;
mouse.active = 1;
MSE_INT_ON();
return 0;
}
/*
* writes are disallowed
*/
static int write_mouse(struct inode * inode, struct file * file, 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;
if (dx > 127)
dx = 127;
if (dy < -127)
dy = -127;
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, must disable the mouse interrupt while checking
* mouse.ready/select_wait() to avoid race condition (though in reality
* such a condition is not fatal to the proper operation of the mouse since
* multiple interrupts generally occur).
*/
static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
{
int r = 0;
if (sel_type == SEL_IN) {
MSE_INT_OFF();
if (mouse.ready) {
r = 1;
} else {
select_wait(&mouse.wait, wait);
}
MSE_INT_ON();
}
return(r);
}
struct file_operations 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,
close_mouse,
};
unsigned long bus_mouse_init(unsigned long kmem_start)
{
int i;
outb(MSE_CONFIG_BYTE, MSE_CONFIG_PORT);
outb(MSE_SIGNATURE_BYTE, MSE_SIGNATURE_PORT);
for (i = 0; i < 100000; i++)
/* busy loop */;
if (inb(MSE_SIGNATURE_PORT) != MSE_SIGNATURE_BYTE) {
mouse.present = 0;
return kmem_start;
}
outb(MSE_DEFAULT_MODE, MSE_CONFIG_PORT);
MSE_INT_OFF();
mouse.present = 1;
mouse.active = 0;
mouse.ready = 0;
mouse.buttons = 0x87;
mouse.dx = 0;
mouse.dy = 0;
mouse.wait = NULL;
printk("Logitech Bus mouse detected and installed with IRQ %d.\n",
mouse_irq);
return kmem_start;
}
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