drivers/char/atixlmouse.c

   1 /*
   2  * ATI XL Bus Mouse Driver for Linux
   3  * by Bob Harris (rth@sparta.com)
   4  *
   5  * Uses VFS interface for linux 0.98 (01OCT92)
   6  *
   7  * Modified by Chris Colohan (colohan@eecg.toronto.edu)
   8  * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
   9  *
  10  * Converted to use new generic busmouse code.  5 Apr 1998
  11  *   Russell King <rmk@arm.uk.linux.org>
  12  *
  13  * version 0.3a
  14  */
  15
  16 #include <linux/module.h>
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/signal.h>
  21 #include <linux/errno.h>
  22 #include <linux/miscdevice.h>
  23 #include <linux/random.h>
  24 #include <linux/poll.h>
  25 #include <linux/init.h>
  26 #include <linux/ioport.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/system.h>
  31 #include <asm/irq.h>
  32
  33 #include "busmouse.h"
  34
  35 #define ATIXL_MOUSE_IRQ         5 /* H/W interrupt # set up on ATIXL board */
  36 #define ATIXL_BUSMOUSE          3 /* Minor device # (mknod c 10 3 /dev/bm) */
  37
  38 /* ATI XL Inport Busmouse Definitions */
  39
  40 #define ATIXL_MSE_DATA_PORT             0x23d
  41 #define ATIXL_MSE_SIGNATURE_PORT        0x23e
  42 #define ATIXL_MSE_CONTROL_PORT          0x23c
  43
  44 #define ATIXL_MSE_READ_BUTTONS          0x00
  45 #define ATIXL_MSE_READ_X                0x01
  46 #define ATIXL_MSE_READ_Y                0x02
  47
  48 /* Some nice ATI XL macros */
  49
  50 /* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */
  51 #define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  52         outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  53
  54 /* Select IR7, Enable updates (INT ENABLED) */
  55 #define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  56          outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  57
  58 /* Select IR7 - Mode Register, NO INTERRUPTS */
  59 #define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  60         outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  61
  62 /* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */
  63 #define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  64         outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  65
  66 /* Same general mouse structure */
  67
  68 static int msedev;
  69
  70 static void mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
  71 {
  72         char dx, dy, buttons;
  73
  74         ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */
  75         outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */
  76         dx = inb( ATIXL_MSE_DATA_PORT);
  77         outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */
  78         dy = inb( ATIXL_MSE_DATA_PORT);
  79         outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */
  80         buttons = inb( ATIXL_MSE_DATA_PORT);
  81         busmouse_add_movementbuttons(msedev, dx, -dy, buttons);
  82         ATIXL_MSE_ENABLE_UPDATE();
  83 }
  84
  85 static int release_mouse(struct inode * inode, struct file * file)
  86 {
  87         ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */
  88         free_irq(ATIXL_MOUSE_IRQ, NULL);
  89         return 0;
  90 }
  91
  92 static int open_mouse(struct inode * inode, struct file * file)
  93 {
  94         if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse", NULL))
  95                 return -EBUSY;
  96         ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */
  97         return 0;
  98 }
  99
 100 static struct busmouse atixlmouse = {
 101         ATIXL_BUSMOUSE, "atixl", THIS_MODULE, open_mouse, release_mouse, 0
 102 };
 103
 104 static int __init atixl_busmouse_init(void)
 105 {
 106         unsigned char a,b,c;
 107
 108         /*
 109          *      We must request the resource and claim it atomically
 110          *      nowdays. We can throw it away on error. Otherwise we
 111          *      may race another module load of the same I/O
 112          */
 113
 114         if (!request_region(ATIXL_MSE_DATA_PORT, 3, "atixlmouse"))
 115                 return -EIO;
 116
 117         a = inb( ATIXL_MSE_SIGNATURE_PORT );    /* Get signature */
 118         b = inb( ATIXL_MSE_SIGNATURE_PORT );
 119         c = inb( ATIXL_MSE_SIGNATURE_PORT );
 120         if (( a != b ) && ( a == c ))
 121                 printk(KERN_INFO "\nATI Inport ");
 122         else
 123         {
 124                 release_region(ATIXL_MSE_DATA_PORT,3);
 125                 return -EIO;
 126         }
 127         outb(0x80, ATIXL_MSE_CONTROL_PORT);     /* Reset the Inport device */
 128         outb(0x07, ATIXL_MSE_CONTROL_PORT);     /* Select Internal Register 7 */
 129         outb(0x0a, ATIXL_MSE_DATA_PORT);        /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */
 130
 131         msedev = register_busmouse(&atixlmouse);
 132         if (msedev < 0)
 133         {
 134                 printk("Bus mouse initialisation error.\n");
 135                 release_region(ATIXL_MSE_DATA_PORT,3);  /* Was missing */
 136         }
 137         else
 138                 printk("Bus mouse detected and installed.\n");
 139         return msedev < 0 ? msedev : 0;
 140 }
 141
 142 static void __exit atixl_cleanup (void)
 143 {
 144         release_region(ATIXL_MSE_DATA_PORT, 3);
 145         unregister_busmouse(msedev);
 146 }
 147
 148 module_init(atixl_busmouse_init);
 149 module_exit(atixl_cleanup);
 150