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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.
*
* Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
*
* version 0.3b
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/busmouse.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/irq.h>
static struct mouse_status mouse;
static int mouse_irq = MOUSE_IRQ;
#ifdef MODULE
MODULE_PARM(mouse_irq, "i");
#endif
__initfunc(void msmouse_setup(char *str, int *ints))
{
if (ints[0] > 0)
mouse_irq=ints[1];
}
static void ms_mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
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)) {
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);
if (mouse.fasyncptr)
kill_fasync(mouse.fasyncptr, SIGIO);
}
}
static int fasync_mouse(int fd, struct file *filp, int on)
{
int retval;
retval = fasync_helper(fd, filp, on, &mouse.fasyncptr);
if (retval < 0)
return retval;
return 0;
}
static int release_mouse(struct inode * inode, struct file * file)
{
fasync_mouse(-1, file, 0);
if (--mouse.active)
return 0;
MS_MSE_INT_OFF();
mouse.ready = 0;
free_irq(mouse_irq, NULL);
MOD_DEC_USE_COUNT;
return 0;
}
static int open_mouse(struct inode * inode, struct file * file)
{
if (!mouse.present)
return -EINVAL;
if (mouse.active++)
return 0;
if (request_irq(mouse_irq, ms_mouse_interrupt, 0, "MS Busmouse", NULL)) {
mouse.active--;
return -EBUSY;
}
mouse.ready = mouse.dx = mouse.dy = 0;
mouse.buttons = 0x80;
outb(MS_MSE_START, MS_MSE_CONTROL_PORT);
MOD_INC_USE_COUNT;
MS_MSE_INT_ON();
return 0;
}
static ssize_t write_mouse(struct file * file,
const char * buffer, size_t count, loff_t *ppos)
{
return -EINVAL;
}
static ssize_t read_mouse(struct file * file,
char * buffer, size_t count, loff_t *ppos)
{
int i, dx, dy;
if (count < 3)
return -EINVAL;
if (!mouse.ready)
return -EAGAIN;
put_user(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_user((char)dx, buffer + 1);
put_user((char)dy, buffer + 2);
for (i = 3; i < count; i++)
put_user(0x00, buffer + i);
mouse.dx -= dx;
mouse.dy += dy;
mouse.ready = 0;
return i;
}
static unsigned int mouse_poll(struct file *file, poll_table * wait)
{
poll_wait(file, &mouse.wait, wait);
if (mouse.ready)
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations ms_bus_mouse_fops = {
NULL, /* mouse_seek */
read_mouse,
write_mouse,
NULL, /* mouse_readdir */
mouse_poll, /* mouse_poll */
NULL, /* mouse_ioctl */
NULL, /* mouse_mmap */
open_mouse,
NULL, /* flush */
release_mouse,
NULL,
fasync_mouse,
};
static struct miscdevice ms_bus_mouse = {
MICROSOFT_BUSMOUSE, "msbusmouse", &ms_bus_mouse_fops
};
__initfunc(int ms_bus_mouse_init(void))
{
int mse_byte, i;
mouse.present = mouse.active = mouse.ready = 0;
mouse.buttons = 0x80;
mouse.dx = mouse.dy = 0;
mouse.wait = NULL;
if (check_region(MS_MSE_CONTROL_PORT, 0x04))
return -ENODEV;
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 -EIO;
MS_MSE_INT_OFF();
request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");
printk(KERN_INFO "Microsoft BusMouse detected and installed.\n");
misc_register(&ms_bus_mouse);
return 0;
}
#ifdef MODULE
int init_module(void)
{
return ms_bus_mouse_init();
}
void cleanup_module(void)
{
misc_deregister(&ms_bus_mouse);
release_region(MS_MSE_CONTROL_PORT, 0x04);
}
#endif
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