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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)
- *
- * version 0.3
- */
-
- #include <linux/kernel.h>
- #include <linux/sched.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 irq, 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) {
- mouse.latch_buttons |= buttons;
- mouse.dx += dx;
- mouse.dy += dy;
- mouse.ready = 1;
- wake_up_interruptible(&mouse.wait);
- }
- ATIXL_MSE_ENABLE_UPDATE();
- }
-
- 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, 0, "ATIXL mouse")) {
- 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)
- {
- int 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_fs_byte((char)(~mouse.latch_buttons&7) | 0x80 , buffer);
- if (mouse.dx < -127)
- mouse.dx = -127;
- if (mouse.dx > 127)
- mouse.dx = 127;
- put_fs_byte((char)mouse.dx, buffer + 1);
- if (mouse.dy < -127)
- mouse.dy = -127;
- if (mouse.dy > 127)
- mouse.dy = 127;
- put_fs_byte((char)-mouse.dy, buffer + 2);
- for(i = 3; i < count; i++)
- put_fs_byte(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 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;
- }
-