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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)
*
* version 0.3
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/tty.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>
#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;
} mouse;
void mouse_interrupt(int unused)
{
ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */
outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */
mouse.dx += inb( ATIXL_MSE_DATA_PORT);
outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */
mouse.dy += inb( ATIXL_MSE_DATA_PORT);
outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */
mouse.latch_buttons |= inb( ATIXL_MSE_DATA_PORT);
ATIXL_MSE_ENABLE_UPDATE();
mouse.ready = 1;
wake_up_interruptible(&mouse.wait);
}
static void release_mouse(struct inode * inode, struct file * file)
{
ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */
mouse.active = 0;
mouse.ready = 0;
free_irq(ATIXL_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 = 0;
mouse.dx = 0;
mouse.dy = 0;
mouse.buttons = mouse.latch_buttons = 0;
if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt)) {
mouse.active = 0;
return -EBUSY;
}
ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */
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)
{
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_fs_byte((char)(~mouse.latch_buttons&7) | 0x80 , buffer);
put_fs_byte((char)mouse.dx, buffer + 1);
put_fs_byte((char)-mouse.dy, buffer + 2);
mouse.dx = 0;
mouse.dy = 0;
mouse.latch_buttons = mouse.buttons;
mouse.ready = 0;
ATIXL_MSE_ENABLE_UPDATE();
return 3; /* 3 data bytes returned */
}
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 atixl_busmouse_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 atixl_busmouse_init(unsigned long kmem_start)
{
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("\nATI Inport ");
else{
mouse.present = 0;
return kmem_start;
}
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");
return kmem_start;
}
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