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/*
* ATI XL Bus Mouse Driver for Linux
* by Bob Harris (rth@sparta.com)
*
* Uses VFS interface for linux 0.98 (01OCT92)
*
* Modified by Chris Colohan (colohan@eecg.toronto.edu)
* Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
*
* version 0.3a
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.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>
#define ATIXL_MOUSE_IRQ 5 /* H/W interrupt # set up on ATIXL board */
#define ATIXL_BUSMOUSE 3 /* Minor device # (mknod c 10 3 /dev/bm) */
/* ATI XL Inport Busmouse Definitions */
#define ATIXL_MSE_DATA_PORT 0x23d
#define ATIXL_MSE_SIGNATURE_PORT 0x23e
#define ATIXL_MSE_CONTROL_PORT 0x23c
#define ATIXL_MSE_READ_BUTTONS 0x00
#define ATIXL_MSE_READ_X 0x01
#define ATIXL_MSE_READ_Y 0x02
/* Some nice ATI XL macros */
/* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */
#define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
/* Select IR7, Enable updates (INT ENABLED) */
#define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
/* Select IR7 - Mode Register, NO INTERRUPTS */
#define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
/* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */
#define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
/* Same general mouse structure */
static struct mouse_status {
char buttons;
char latch_buttons;
int dx;
int dy;
int present;
int ready;
int active;
struct wait_queue *wait;
struct fasync_struct *fasync;
} mouse;
void mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
char dx, dy, buttons;
ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */
outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */
dx = inb( ATIXL_MSE_DATA_PORT);
outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */
dy = inb( ATIXL_MSE_DATA_PORT);
outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */
buttons = inb( ATIXL_MSE_DATA_PORT);
if (dx != 0 || dy != 0 || buttons != mouse.latch_buttons) {
add_mouse_randomness((buttons << 16) + (dy << 8) + dx);
mouse.latch_buttons |= buttons;
mouse.dx += dx;
mouse.dy += dy;
mouse.ready = 1;
wake_up_interruptible(&mouse.wait);
if (mouse.fasync)
kill_fasync(mouse.fasync, SIGIO);
}
ATIXL_MSE_ENABLE_UPDATE();
}
static int fasync_mouse(struct file *filp, int on)
{
int retval;
retval = fasync_helper(filp, on, &mouse.fasync);
if (retval < 0)
return retval;
return 0;
}
static int release_mouse(struct inode * inode, struct file * file)
{
fasync_mouse(file, 0);
if (--mouse.active)
return 0;
ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */
mouse.ready = 0;
free_irq(ATIXL_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(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse", NULL)) {
mouse.active--;
return -EBUSY;
}
mouse.ready = 0;
mouse.dx = 0;
mouse.dy = 0;
mouse.buttons = mouse.latch_buttons = 0;
ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */
MOD_INC_USE_COUNT;
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)
{
ssize_t i;
if (count < 3)
return -EINVAL;
if (!mouse.ready)
return -EAGAIN;
ATIXL_MSE_DISABLE_UPDATE();
/* Allowed interrupts to occur during data gathering - shouldn't hurt */
put_user((char)(~mouse.latch_buttons&7) | 0x80 , buffer);
if (mouse.dx < -127)
mouse.dx = -127;
if (mouse.dx > 127)
mouse.dx = 127;
put_user((char)mouse.dx, buffer + 1);
if (mouse.dy < -127)
mouse.dy = -127;
if (mouse.dy > 127)
mouse.dy = 127;
put_user((char)-mouse.dy, buffer + 2);
for(i = 3; i < count; i++)
put_user(0x00, buffer + i);
mouse.dx = 0;
mouse.dy = 0;
mouse.latch_buttons = mouse.buttons;
mouse.ready = 0;
ATIXL_MSE_ENABLE_UPDATE();
return i; /* i data bytes returned */
}
static unsigned int mouse_poll(struct file *file, poll_table * wait)
{
poll_wait(&mouse.wait, wait);
if (mouse.ready)
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations atixl_busmouse_fops = {
NULL, /* mouse_seek */
read_mouse,
write_mouse,
NULL, /* mouse_readdir */
mouse_poll, /* mouse_poll */
NULL, /* mouse_ioctl */
NULL, /* mouse_mmap */
open_mouse,
release_mouse,
NULL,
fasync_mouse,
};
static struct miscdevice atixl_mouse = {
ATIXL_BUSMOUSE, "atixl", &atixl_busmouse_fops
};
__initfunc(int atixl_busmouse_init(void))
{
unsigned char a,b,c;
a = inb( ATIXL_MSE_SIGNATURE_PORT ); /* Get signature */
b = inb( ATIXL_MSE_SIGNATURE_PORT );
c = inb( ATIXL_MSE_SIGNATURE_PORT );
if (( a != b ) && ( a == c ))
printk(KERN_INFO "\nATI Inport ");
else{
mouse.present = 0;
return -EIO;
}
outb(0x80, ATIXL_MSE_CONTROL_PORT); /* Reset the Inport device */
outb(0x07, ATIXL_MSE_CONTROL_PORT); /* Select Internal Register 7 */
outb(0x0a, ATIXL_MSE_DATA_PORT); /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */
mouse.present = 1;
mouse.active = 0;
mouse.ready = 0;
mouse.buttons = mouse.latch_buttons = 0;
mouse.dx = mouse.dy = 0;
mouse.wait = NULL;
printk("Bus mouse detected and installed.\n");
misc_register(&atixl_mouse);
return 0;
}
#ifdef MODULE
int init_module(void)
{
return atixl_busmouse_init();
}
void cleanup_module(void)
{
misc_deregister(&atixl_mouse);
}
#endif
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