kernel/chr_drv/busmouse.c

/* */
This source file includes following definitions.
bmouse_setup
mouse_interrupt
release_mouse
open_mouse
write_mouse
read_mouse
mouse_select
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)
     /*  */
  38 {
  39         if (ints[0] > 0)
  40                 mouse_irq=ints[1];
  41 }
  42 
  43 static void mouse_interrupt(int unused)
     /*  */
  44 {
  45         char dx, dy, buttons;
  46 
  47         MSE_INT_OFF();
  48         outb(MSE_READ_X_LOW, MSE_CONTROL_PORT);
  49         dx = (inb(MSE_DATA_PORT) & 0xf);
  50         outb(MSE_READ_X_HIGH, MSE_CONTROL_PORT);
  51         dx |= (inb(MSE_DATA_PORT) & 0xf) << 4;
  52         outb(MSE_READ_Y_LOW, MSE_CONTROL_PORT );
  53         dy = (inb(MSE_DATA_PORT) & 0xf);
  54         outb(MSE_READ_Y_HIGH, MSE_CONTROL_PORT);
  55         buttons = inb(MSE_DATA_PORT);
  56         dy |= (buttons & 0xf) << 4;
  57         buttons = ((buttons >> 5) & 0x07);
  58         if (dx != 0 || dy != 0 || buttons != mouse.buttons) {
  59           mouse.buttons = buttons;
  60           mouse.dx += dx;
  61           mouse.dy += dy;
  62           mouse.ready = 1;
  63           wake_up_interruptible(&mouse.wait);
  64         }
  65         MSE_INT_ON();
  66 }
  67 
  68 static void release_mouse(struct inode * inode, struct file * file)
     /*  */
  69 {
  70         MSE_INT_OFF();
  71         mouse.active = 0;
  72         mouse.ready = 0;
  73         free_irq(mouse_irq);
  74 }
  75 
  76 static int open_mouse(struct inode * inode, struct file * file)
     /*  */
  77 {
  78         if (!mouse.present)
  79                 return -EINVAL;
  80         if (mouse.active)
  81                 return -EBUSY;
  82         mouse.active = 1;
  83         mouse.ready = 0;
  84         mouse.dx = 0;
  85         mouse.dy = 0;
  86         mouse.buttons = 0x87;
  87         if (request_irq(mouse_irq, mouse_interrupt)) {
  88                 mouse.active = 0;
  89                 return -EBUSY;
  90         }
  91         MSE_INT_ON();
  92         return 0;
  93 }
  94 
  95 
  96 static int write_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
  97 {
  98         return -EINVAL;
  99 }
 100 
 101 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
 102 {
 103         int i;
 104 
 105         if (count < 3)
 106                 return -EINVAL;
 107         if (!mouse.ready)
 108                 return -EAGAIN;
 109         MSE_INT_OFF();
 110         put_fs_byte(mouse.buttons | 0x80, buffer);
 111         if (mouse.dx < -127)
 112                 mouse.dx = -127;
 113         if (mouse.dx > 127)
 114                 mouse.dx =  127;
 115         put_fs_byte((char)mouse.dx, buffer + 1);
 116         if (mouse.dy < -127)
 117                 mouse.dy = -127;
 118         if (mouse.dy > 127)
 119                 mouse.dy =  127;
 120         put_fs_byte((char) -mouse.dy, buffer + 2);
 121         for (i = 3; i < count; i++)
 122                 put_fs_byte(0x00, buffer + i);
 123         mouse.dx = 0;
 124         mouse.dy = 0;
 125         mouse.ready = 0;
 126         MSE_INT_ON();
 127         return i;
 128 }
 129 
 130 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
     /*  */
 131 {
 132         if (sel_type != SEL_IN)
 133                 return 0;
 134         if (mouse.ready)
 135                 return 1;
 136         select_wait(&mouse.wait, wait);
 137         return 0;
 138 }
 139 
 140 struct file_operations bus_mouse_fops = {
 141         NULL,           /* mouse_seek */
 142         read_mouse,
 143         write_mouse,
 144         NULL,           /* mouse_readdir */
 145         mouse_select,   /* mouse_select */
 146         NULL,           /* mouse_ioctl */
 147         NULL,           /* mouse_mmap */
 148         open_mouse,
 149         release_mouse,
 150 };
 151 
 152 unsigned long bus_mouse_init(unsigned long kmem_start)
     /*  */
 153 {
 154         int i;
 155 
 156         outb(MSE_CONFIG_BYTE, MSE_CONFIG_PORT);
 157         outb(MSE_SIGNATURE_BYTE, MSE_SIGNATURE_PORT);
 158         for (i = 0; i < 100000; i++)
 159                 /* busy loop */;
 160         if (inb(MSE_SIGNATURE_PORT) != MSE_SIGNATURE_BYTE) {
 161                 mouse.present = 0;
 162                 return kmem_start;
 163         }
 164         outb(MSE_DEFAULT_MODE, MSE_CONFIG_PORT);
 165         MSE_INT_OFF();
 166         mouse.present = 1;
 167         mouse.active = 0;
 168         mouse.ready = 0;
 169         mouse.buttons = 0x87;
 170         mouse.dx = 0;
 171         mouse.dy = 0;
 172         mouse.wait = NULL;
 173         printk("Logitech Bus mouse detected and installed.\n");
 174         return kmem_start;
 175 }
/* */
root/kernel/chr_drv/busmouse.c

DEFINITIONS
