drivers/char/atixlmouse.c

/* */
This source file includes following definitions.
mouse_interrupt
fasync_mouse
release_mouse
open_mouse
write_mouse
read_mouse
mouse_select
init_module
cleanup_module
   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  * version 0.3a
  11  */
  12 
  13 #ifdef MODULE
  14 #include <linux/module.h>
  15 #include <linux/version.h>
  16 #else
  17 #define MOD_INC_USE_COUNT
  18 #define MOD_DEC_USE_COUNT
  19 #endif
  20 
  21 #include <linux/kernel.h>
  22 #include <linux/sched.h>
  23 #include <linux/signal.h>
  24 #include <linux/errno.h>
  25 
  26 #include <asm/io.h>
  27 #include <asm/segment.h>
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 
  31 #include "mouse.h"
  32 
  33 #define ATIXL_MOUSE_IRQ         5 /* H/W interrupt # set up on ATIXL board */
  34 #define ATIXL_BUSMOUSE          3 /* Minor device # (mknod c 10 3 /dev/bm) */
  35 
  36 /* ATI XL Inport Busmouse Definitions */
  37 
  38 #define ATIXL_MSE_DATA_PORT             0x23d
  39 #define ATIXL_MSE_SIGNATURE_PORT        0x23e
  40 #define ATIXL_MSE_CONTROL_PORT          0x23c
  41 
  42 #define ATIXL_MSE_READ_BUTTONS          0x00
  43 #define ATIXL_MSE_READ_X                0x01
  44 #define ATIXL_MSE_READ_Y                0x02
  45 
  46 /* Some nice ATI XL macros */
  47 
  48 /* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */
  49 #define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  50         outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  51 
  52 /* Select IR7, Enable updates (INT ENABLED) */
  53 #define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  54          outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  55 
  56 /* Select IR7 - Mode Register, NO INTERRUPTS */
  57 #define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  58         outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  59 
  60 /* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */
  61 #define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
  62         outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
  63 
  64 /* Same general mouse structure */
  65 
  66 static struct mouse_status {
  67         char buttons;
  68         char latch_buttons;
  69         int dx;
  70         int dy;
  71         int present;
  72         int ready;
  73         int active;
  74         struct wait_queue *wait;
  75         struct fasync_struct *fasync;
  76 } mouse;
  77 
  78 void mouse_interrupt(int irq, struct pt_regs * regs)
     /*  */
  79 {
  80         char dx, dy, buttons;
  81 
  82         ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */
  83         outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */
  84         dx = inb( ATIXL_MSE_DATA_PORT);
  85         outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */
  86         dy = inb( ATIXL_MSE_DATA_PORT);
  87         outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */
  88         buttons = inb( ATIXL_MSE_DATA_PORT);
  89         if (dx != 0 || dy != 0 || buttons != mouse.latch_buttons) {
  90                 mouse.latch_buttons |= buttons;
  91                 mouse.dx += dx;
  92                 mouse.dy += dy;
  93                 mouse.ready = 1;
  94                 wake_up_interruptible(&mouse.wait);
  95                 if (mouse.fasync)
  96                         kill_fasync(mouse.fasync, SIGIO);
  97         }
  98         ATIXL_MSE_ENABLE_UPDATE();
  99 }
 100 
 101 static int fasync_mouse(struct inode *inode, struct file *filp, int on)
     /*  */
 102 {
 103         int retval;
 104 
 105         retval = fasync_helper(inode, filp, on, &mouse.fasync);
 106         if (retval < 0)
 107                 return retval;
 108         return 0;
 109 }
 110 
 111 static void release_mouse(struct inode * inode, struct file * file)
     /*  */
 112 {
 113         ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */
 114         mouse.active = 0;
 115         mouse.ready = 0;
 116         free_irq(ATIXL_MOUSE_IRQ);
 117         fasync_mouse(inode, file, 0);
 118 }
 119 
 120 static int open_mouse(struct inode * inode, struct file * file)
     /*  */
 121 {
 122         if (!mouse.present)
 123                 return -EINVAL;
 124         if (mouse.active)
 125                 return -EBUSY;
 126         mouse.active = 1;
 127         mouse.ready = 0;
 128         mouse.dx = 0;
 129         mouse.dy = 0;
 130         mouse.buttons = mouse.latch_buttons = 0;
 131         if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse")) {
 132                 mouse.active = 0;
 133                 return -EBUSY;
 134         }
 135         ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */
 136         return 0;
 137 }
 138 
 139 
 140 static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)
     /*  */
 141 {
 142         return -EINVAL;
 143 }
 144 
 145 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
 146 {
 147         int i;
 148 
 149         if (count < 3)
 150                 return -EINVAL;
 151         if (!mouse.ready)
 152                 return -EAGAIN;
 153         ATIXL_MSE_DISABLE_UPDATE();
 154         /* Allowed interrupts to occur during data gathering - shouldn't hurt */
 155         put_user((char)(~mouse.latch_buttons&7) | 0x80 , buffer);
 156         if (mouse.dx < -127)
 157                 mouse.dx = -127;
 158         if (mouse.dx > 127)
 159                 mouse.dx =  127;
 160         put_user((char)mouse.dx, buffer + 1);
 161         if (mouse.dy < -127)
 162                 mouse.dy = -127;
 163         if (mouse.dy > 127)
 164                 mouse.dy =  127;
 165         put_user((char)-mouse.dy, buffer + 2);
 166         for(i = 3; i < count; i++)
 167                 put_user(0x00, buffer + i);
 168         mouse.dx = 0;
 169         mouse.dy = 0;
 170         mouse.latch_buttons = mouse.buttons;
 171         mouse.ready = 0;
 172         ATIXL_MSE_ENABLE_UPDATE();
 173         return i; /* i data bytes returned */
 174 }
 175 
 176 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
     /*  */
 177 {
 178         if (sel_type != SEL_IN)
 179                 return 0;
 180         if (mouse.ready)
 181                 return 1;
 182         select_wait(&mouse.wait,wait);
 183         return 0;
 184 }
 185 
 186 struct file_operations atixl_busmouse_fops = {
 187         NULL,           /* mouse_seek */
 188         read_mouse,
 189         write_mouse,
 190         NULL,           /* mouse_readdir */
 191         mouse_select,   /* mouse_select */
 192         NULL,           /* mouse_ioctl */
 193         NULL,           /* mouse_mmap */
 194         open_mouse,
 195         release_mouse,
 196         NULL,
 197         fasync_mouse,
 198 };
 199 
 200 static struct mouse atixl_mouse = { 
 201         ATIXL_BUSMOUSE, "atixl", &atixl_busmouse_fops
 202 };
 203 
 204 #ifdef MODULE
 205 char kernel_version[] = UTS_RELEASE;
 206 
 207 int init_module(void)
     /*  */
 208 #else
 209 unsigned long atixl_busmouse_init(unsigned long kmem_start)
 210 #endif
 211 {
 212         unsigned char a,b,c;
 213 
 214         a = inb( ATIXL_MSE_SIGNATURE_PORT );    /* Get signature */
 215         b = inb( ATIXL_MSE_SIGNATURE_PORT );
 216         c = inb( ATIXL_MSE_SIGNATURE_PORT );
 217         if (( a != b ) && ( a == c ))
 218                 printk("\nATI Inport ");
 219         else{
 220                 mouse.present = 0;
 221 #ifdef MODULE
 222                 return -EIO;
 223 #else
 224                 return kmem_start;
 225 #endif
 226         }
 227         outb(0x80, ATIXL_MSE_CONTROL_PORT);     /* Reset the Inport device */
 228         outb(0x07, ATIXL_MSE_CONTROL_PORT);     /* Select Internal Register 7 */
 229         outb(0x0a, ATIXL_MSE_DATA_PORT);        /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */
 230         mouse.present = 1;
 231         mouse.active = 0;
 232         mouse.ready = 0;
 233         mouse.buttons = mouse.latch_buttons = 0;
 234         mouse.dx = mouse.dy = 0;
 235         mouse.wait = NULL;
 236         printk("Bus mouse detected and installed.\n");
 237         mouse_register(&atixl_mouse);
 238 #ifdef MODULE
 239         return 0;
 240 #else
 241         return kmem_start;
 242 #endif
 243 }
 244 
 245 #ifdef MODULE
 246 void cleanup_module(void)
     /*  */
 247 {
 248         if (MOD_IN_USE)
 249                 printk("atixlmouse: in use, remove delayed\n");
 250         mouse_deregister(&atixl_mouse);
 251 }
 252 #endif
/* */
root/drivers/char/atixlmouse.c

DEFINITIONS
