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

DEFINITIONS
