root/kernel/chr_drv/busmouse.c

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DEFINITIONS

This source file includes following definitions.
  1. bmouse_setup
  2. mouse_interrupt
  3. release_mouse
  4. open_mouse
  5. write_mouse
  6. read_mouse
  7. mouse_select
  8. bus_mouse_init

   1 /*
   2  * Logitech Bus Mouse Driver for Linux
   3  * by James Banks
   4  *
   5  * Heavily modified by David Giller
   6  *   changed from queue- to counter- driven
   7  *   hacked out a (probably incorrect) mouse_select
   8  *
   9  * Modified again by Nathan Laredo to interface with
  10  *   0.96c-pl1 IRQ handling changes (13JUL92)
  11  *   didn't bother touching select code.
  12  *
  13  * Modified the select() code blindly to conform to the VFS
  14  *   requirements. 92.07.14 - Linus. Somebody should test it out.
  15  *
  16  * Modified by Johan Myreen to make room for other mice (9AUG92)
  17  *   removed assignment chr_fops[10] = &mouse_fops; see mouse.c
  18  *   renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public.
  19  *   renamed this file mouse.c => busmouse.c
  20  */
  21 
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/busmouse.h>
  25 #include <linux/tty.h>
  26 #include <linux/signal.h>
  27 #include <linux/errno.h>
  28 
  29 #include <asm/io.h>
  30 #include <asm/segment.h>
  31 #include <asm/system.h>
  32 #include <asm/irq.h>
  33 
  34 static struct mouse_status mouse;
  35 static int mouse_irq = MOUSE_IRQ;
  36 
  37 void bmouse_setup(char *str, int *ints)
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  38 {
  39         if (ints[0] > 0)
  40                 mouse_irq=ints[1];
  41 }
  42 
  43 static void mouse_interrupt(int unused)
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  44 {
  45         char dx, dy;
  46         unsigned char buttons;
  47 
  48         MSE_INT_OFF();
  49         outb(MSE_READ_X_LOW, MSE_CONTROL_PORT);
  50         dx = (inb(MSE_DATA_PORT) & 0xf);
  51         outb(MSE_READ_X_HIGH, MSE_CONTROL_PORT);
  52         dx |= (inb(MSE_DATA_PORT) & 0xf) << 4;
  53         outb(MSE_READ_Y_LOW, MSE_CONTROL_PORT );
  54         dy = (inb(MSE_DATA_PORT) & 0xf);
  55         outb(MSE_READ_Y_HIGH, MSE_CONTROL_PORT);
  56         buttons = inb(MSE_DATA_PORT);
  57         dy |= (buttons & 0xf) << 4;
  58         buttons = ((buttons >> 5) & 0x07);
  59         if (dx != 0 || dy != 0 || buttons != mouse.buttons) {
  60           mouse.buttons = buttons;
  61           mouse.dx += dx;
  62           mouse.dy += dy;
  63           mouse.ready = 1;
  64           wake_up_interruptible(&mouse.wait);
  65         }
  66         MSE_INT_ON();
  67 }
  68 
  69 static void release_mouse(struct inode * inode, struct file * file)
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  70 {
  71         MSE_INT_OFF();
  72         mouse.active = 0;
  73         mouse.ready = 0;
  74         free_irq(mouse_irq);
  75 }
  76 
  77 static int open_mouse(struct inode * inode, struct file * file)
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  78 {
  79         if (!mouse.present)
  80                 return -EINVAL;
  81         if (mouse.active)
  82                 return -EBUSY;
  83         mouse.active = 1;
  84         mouse.ready = 0;
  85         mouse.dx = 0;
  86         mouse.dy = 0;
  87         mouse.buttons = 0x87;
  88         if (request_irq(mouse_irq, mouse_interrupt)) {
  89                 mouse.active = 0;
  90                 return -EBUSY;
  91         }
  92         MSE_INT_ON();
  93         return 0;
  94 }
  95 
  96 
  97 static int write_mouse(struct inode * inode, struct file * file, char * buffer, int count)
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  98 {
  99         return -EINVAL;
 100 }
 101 
 102 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
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 103 {
 104         int i;
 105 
 106         if (count < 3)
 107                 return -EINVAL;
 108         if (!mouse.ready)
 109                 return -EAGAIN;
 110         MSE_INT_OFF();
 111         put_fs_byte(mouse.buttons | 0x80, buffer);
 112         if (mouse.dx < -127)
 113                 mouse.dx = -127;
 114         if (mouse.dx > 127)
 115                 mouse.dx =  127;
 116         put_fs_byte((char)mouse.dx, buffer + 1);
 117         if (mouse.dy < -127)
 118                 mouse.dy = -127;
 119         if (mouse.dy > 127)
 120                 mouse.dy =  127;
 121         put_fs_byte((char) -mouse.dy, buffer + 2);
 122         for (i = 3; i < count; i++)
 123                 put_fs_byte(0x00, buffer + i);
 124         mouse.dx = 0;
 125         mouse.dy = 0;
 126         mouse.ready = 0;
 127         MSE_INT_ON();
 128         return i;
 129 }
 130 
 131 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
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 132 {
 133         if (sel_type != SEL_IN)
 134                 return 0;
 135         if (mouse.ready)
 136                 return 1;
 137         select_wait(&mouse.wait, wait);
 138         return 0;
 139 }
 140 
 141 struct file_operations bus_mouse_fops = {
 142         NULL,           /* mouse_seek */
 143         read_mouse,
 144         write_mouse,
 145         NULL,           /* mouse_readdir */
 146         mouse_select,   /* mouse_select */
 147         NULL,           /* mouse_ioctl */
 148         NULL,           /* mouse_mmap */
 149         open_mouse,
 150         release_mouse,
 151 };
 152 
 153 unsigned long bus_mouse_init(unsigned long kmem_start)
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 154 {
 155         int i;
 156 
 157         outb(MSE_CONFIG_BYTE, MSE_CONFIG_PORT);
 158         outb(MSE_SIGNATURE_BYTE, MSE_SIGNATURE_PORT);
 159         for (i = 0; i < 100000; i++)
 160                 /* busy loop */;
 161         if (inb(MSE_SIGNATURE_PORT) != MSE_SIGNATURE_BYTE) {
 162                 mouse.present = 0;
 163                 return kmem_start;
 164         }
 165         outb(MSE_DEFAULT_MODE, MSE_CONFIG_PORT);
 166         MSE_INT_OFF();
 167         mouse.present = 1;
 168         mouse.active = 0;
 169         mouse.ready = 0;
 170         mouse.buttons = 0x87;
 171         mouse.dx = 0;
 172         mouse.dy = 0;
 173         mouse.wait = NULL;
 174         printk("Logitech Bus mouse detected and installed.\n");
 175         return kmem_start;
 176 }

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