drivers/char/msbusmouse.c

/* */
This source file includes following definitions.
ms_mouse_interrupt
fasync_mouse
release_mouse
open_mouse
write_mouse
read_mouse
mouse_select
ms_bus_mouse_init
cleanup_module
   1 /*
   2  * Microsoft busmouse driver based on Logitech driver (see busmouse.c)
   3  *
   4  * Microsoft BusMouse support by Teemu Rantanen (tvr@cs.hut.fi) (02AUG92)
   5  *
   6  * Microsoft Bus Mouse support modified by Derrick Cole (cole@concert.net)
   7  *    8/28/92
   8  *
   9  * Microsoft Bus Mouse support folded into 0.97pl4 code
  10  *    by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92)
  11  * Changes:  Logitech and Microsoft support in the same kernel.
  12  *           Defined new constants in busmouse.h for MS mice.
  13  *           Added int mse_busmouse_type to distinguish busmouse types
  14  *           Added a couple of new functions to handle differences in using
  15  *             MS vs. Logitech (where the int variable wasn't appropriate).
  16  *
  17  * Modified by Peter Cervasio (address above) (26SEP92)
  18  * Changes:  Included code to (properly?) detect when a Microsoft mouse is
  19  *           really attached to the machine.  Don't know what this does to
  20  *           Logitech bus mice, but all it does is read ports.
  21  *
  22  * Modified by Christoph Niemann (niemann@rubdv15.etdv.ruhr-uni-bochum.de)
  23  * Changes:  Better interrupt-handler (like in busmouse.c).
  24  *           Some changes to reduce code-size.
  25  *           Changed detection code to use inb_p() instead of doing empty
  26  *           loops to delay i/o.
  27  *
  28  * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
  29  *
  30  * version 0.3b
  31  */
  32 
  33 #ifdef MODULE
  34 #include <linux/module.h>
  35 #include <linux/version.h>
  36 
  37 char kernel_version[] = UTS_RELEASE;
  38 #define ms_bus_mouse_init init_module
  39 #else
  40 #define MOD_INC_USE_COUNT
  41 #define MOD_DEC_USE_COUNT
  42 #endif
  43 
  44 #include <linux/kernel.h>
  45 #include <linux/ioport.h>
  46 #include <linux/sched.h>
  47 #include <linux/busmouse.h>
  48 #include <linux/signal.h>
  49 #include <linux/errno.h>
  50 #include <linux/mouse.h>
  51 #include <linux/random.h>
  52 
  53 #include <asm/io.h>
  54 #include <asm/segment.h>
  55 #include <asm/system.h>
  56 #include <asm/irq.h>
  57 
  58 static struct mouse_status mouse;
  59 
  60 static void ms_mouse_interrupt(int irq, struct pt_regs * regs)
     /*  */
  61 {
  62         char dx, dy;
  63         unsigned char buttons;
  64 
  65         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  66         outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);
  67 
  68         outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);
  69         dx = inb(MS_MSE_DATA_PORT);
  70 
  71         outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);
  72         dy = inb(MS_MSE_DATA_PORT);
  73 
  74         outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);
  75         buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;
  76 
  77         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  78         outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);
  79 
  80         if (dx != 0 || dy != 0 || buttons != mouse.buttons || ((~buttons) & 0x07)) {
  81                 add_mouse_randomness((buttons << 16) + (dy << 8) + dx);
  82                 mouse.buttons = buttons;
  83                 mouse.dx += dx;
  84                 mouse.dy += dy;
  85                 mouse.ready = 1;
  86                 wake_up_interruptible(&mouse.wait);
  87                 if (mouse.fasyncptr)
  88                         kill_fasync(mouse.fasyncptr, SIGIO);
  89         }
  90 }
  91 
  92 static int fasync_mouse(struct inode *inode, struct file *filp, int on)
     /*  */
  93 {
  94         int retval;
  95 
  96         retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
  97         if (retval < 0)
  98                 return retval;
  99         return 0;
 100 }
 101 
 102 static void release_mouse(struct inode * inode, struct file * file)
     /*  */
 103 {
 104         fasync_mouse(inode, file, 0);
 105         if (--mouse.active)
 106                 return;
 107         MS_MSE_INT_OFF();
 108         mouse.ready = 0; 
 109         free_irq(MOUSE_IRQ);
 110         MOD_DEC_USE_COUNT;
 111 }
 112 
 113 static int open_mouse(struct inode * inode, struct file * file)
     /*  */
 114 {
 115         if (!mouse.present)
 116                 return -EINVAL;
 117         if (mouse.active++)
 118                 return 0;
 119         if (request_irq(MOUSE_IRQ, ms_mouse_interrupt, 0, "MS Busmouse")) {
 120                 mouse.active--;
 121                 return -EBUSY;
 122         }
 123         mouse.ready = mouse.dx = mouse.dy = 0;  
 124         mouse.buttons = 0x80;
 125         outb(MS_MSE_START, MS_MSE_CONTROL_PORT);
 126         MOD_INC_USE_COUNT;
 127         MS_MSE_INT_ON();        
 128         return 0;
 129 }
 130 
 131 
 132 static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)
     /*  */
 133 {
 134         return -EINVAL;
 135 }
 136 
 137 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
 138 {
 139         int i, dx, dy;
 140 
 141         if (count < 3)
 142                 return -EINVAL;
 143         if (!mouse.ready)
 144                 return -EAGAIN;
 145         put_user(mouse.buttons | 0x80, buffer);
 146         dx = mouse.dx < -127 ? -127 : mouse.dx > 127 ?  127 :  mouse.dx;
 147         dy = mouse.dy < -127 ?  127 : mouse.dy > 127 ? -127 : -mouse.dy;
 148         put_user((char)dx, buffer + 1);
 149         put_user((char)dy, buffer + 2);
 150         for (i = 3; i < count; i++)
 151                 put_user(0x00, buffer + i);
 152         mouse.dx -= dx;
 153         mouse.dy += dy;
 154         mouse.ready = 0;
 155         return i;       
 156 }
 157 
 158 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
     /*  */
 159 {
 160         if (sel_type != SEL_IN)
 161                 return 0;
 162         if (mouse.ready) 
 163                 return 1;
 164         select_wait(&mouse.wait,wait);
 165         return 0;
 166 }
 167 
 168 struct file_operations ms_bus_mouse_fops = {
 169         NULL,           /* mouse_seek */
 170         read_mouse,
 171         write_mouse,
 172         NULL,           /* mouse_readdir */
 173         mouse_select,   /* mouse_select */
 174         NULL,           /* mouse_ioctl */
 175         NULL,           /* mouse_mmap */
 176         open_mouse,
 177         release_mouse,
 178         NULL,
 179         fasync_mouse,
 180 };
 181 
 182 static struct mouse ms_bus_mouse = {
 183         MICROSOFT_BUSMOUSE, "msbusmouse", &ms_bus_mouse_fops
 184 };
 185 
 186 int ms_bus_mouse_init(void)
     /*  */
 187 {
 188         int mse_byte, i;
 189 
 190         mouse.present = mouse.active = mouse.ready = 0;
 191         mouse.buttons = 0x80;
 192         mouse.dx = mouse.dy = 0;
 193         mouse.wait = NULL;
 194 
 195         if (check_region(MS_MSE_CONTROL_PORT, 0x04))
 196                 return -ENODEV;
 197 
 198         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 199 
 200                 mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);
 201 
 202                 for (i = 0; i < 4; i++) {
 203                         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 204                                 if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)
 205                                         mouse.present = 1;
 206                                 else
 207                                         mouse.present = 0;
 208                         } else
 209                                 mouse.present = 0;
 210                 }
 211         }
 212         if (mouse.present == 0)
 213                 return -EIO;
 214         MS_MSE_INT_OFF();
 215         request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");
 216         printk("Microsoft BusMouse detected and installed.\n");
 217         mouse_register(&ms_bus_mouse);
 218         return 0;
 219 }
 220 
 221 #ifdef MODULE
 222 void cleanup_module(void)
     /*  */
 223 {
 224         if (MOD_IN_USE) {
 225                 printk("msbusmouse: in use, remove delayed\n");
 226                 return;
 227         }
 228         mouse_deregister(&ms_bus_mouse);
 229         release_region(MS_MSE_CONTROL_PORT, 0x04);
 230 }
 231 #endif
 232
/* */
root/drivers/char/msbusmouse.c

DEFINITIONS
