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 
  52 #include <asm/io.h>
  53 #include <asm/segment.h>
  54 #include <asm/system.h>
  55 #include <asm/irq.h>
  56 
  57 static struct mouse_status mouse;
  58 
  59 static void ms_mouse_interrupt(int irq, struct pt_regs * regs)
     /*  */
  60 {
  61         char dx, dy;
  62         unsigned char buttons;
  63 
  64         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  65         outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);
  66 
  67         outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);
  68         dx = inb(MS_MSE_DATA_PORT);
  69 
  70         outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);
  71         dy = inb(MS_MSE_DATA_PORT);
  72 
  73         outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);
  74         buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;
  75 
  76         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  77         outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);
  78 
  79         if (dx != 0 || dy != 0 || buttons != mouse.buttons || ((~buttons) & 0x07)) {
  80                 mouse.buttons = buttons;
  81                 mouse.dx += dx;
  82                 mouse.dy += dy;
  83                 mouse.ready = 1;
  84                 wake_up_interruptible(&mouse.wait);
  85                 if (mouse.fasyncptr)
  86                         kill_fasync(mouse.fasyncptr, SIGIO);
  87         }
  88 }
  89 
  90 static int fasync_mouse(struct inode *inode, struct file *filp, int on)
     /*  */
  91 {
  92         int retval;
  93 
  94         retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
  95         if (retval < 0)
  96                 return retval;
  97         return 0;
  98 }
  99 
 100 static void release_mouse(struct inode * inode, struct file * file)
     /*  */
 101 {
 102         fasync_mouse(inode, file, 0);
 103         if (--mouse.active)
 104                 return;
 105         MS_MSE_INT_OFF();
 106         mouse.ready = 0; 
 107         free_irq(MOUSE_IRQ);
 108         MOD_DEC_USE_COUNT;
 109 }
 110 
 111 static int open_mouse(struct inode * inode, struct file * file)
     /*  */
 112 {
 113         if (!mouse.present)
 114                 return -EINVAL;
 115         if (mouse.active++)
 116                 return 0;
 117         if (request_irq(MOUSE_IRQ, ms_mouse_interrupt, 0, "MS Busmouse")) {
 118                 mouse.active--;
 119                 return -EBUSY;
 120         }
 121         mouse.ready = mouse.dx = mouse.dy = 0;  
 122         mouse.buttons = 0x80;
 123         outb(MS_MSE_START, MS_MSE_CONTROL_PORT);
 124         MOD_INC_USE_COUNT;
 125         MS_MSE_INT_ON();        
 126         return 0;
 127 }
 128 
 129 
 130 static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)
     /*  */
 131 {
 132         return -EINVAL;
 133 }
 134 
 135 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
 136 {
 137         int i, dx, dy;
 138 
 139         if (count < 3)
 140                 return -EINVAL;
 141         if (!mouse.ready)
 142                 return -EAGAIN;
 143         put_user(mouse.buttons | 0x80, buffer);
 144         dx = mouse.dx < -127 ? -127 : mouse.dx > 127 ?  127 :  mouse.dx;
 145         dy = mouse.dy < -127 ?  127 : mouse.dy > 127 ? -127 : -mouse.dy;
 146         put_user((char)dx, buffer + 1);
 147         put_user((char)dy, buffer + 2);
 148         for (i = 3; i < count; i++)
 149                 put_user(0x00, buffer + i);
 150         mouse.dx -= dx;
 151         mouse.dy += dy;
 152         mouse.ready = 0;
 153         return i;       
 154 }
 155 
 156 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
     /*  */
 157 {
 158         if (sel_type != SEL_IN)
 159                 return 0;
 160         if (mouse.ready) 
 161                 return 1;
 162         select_wait(&mouse.wait,wait);
 163         return 0;
 164 }
 165 
 166 struct file_operations ms_bus_mouse_fops = {
 167         NULL,           /* mouse_seek */
 168         read_mouse,
 169         write_mouse,
 170         NULL,           /* mouse_readdir */
 171         mouse_select,   /* mouse_select */
 172         NULL,           /* mouse_ioctl */
 173         NULL,           /* mouse_mmap */
 174         open_mouse,
 175         release_mouse,
 176         NULL,
 177         fasync_mouse,
 178 };
 179 
 180 static struct mouse ms_bus_mouse = {
 181         MICROSOFT_BUSMOUSE, "msbusmouse", &ms_bus_mouse_fops
 182 };
 183 
 184 int ms_bus_mouse_init(void)
     /*  */
 185 {
 186         int mse_byte, i;
 187 
 188         mouse.present = mouse.active = mouse.ready = 0;
 189         mouse.buttons = 0x80;
 190         mouse.dx = mouse.dy = 0;
 191         mouse.wait = NULL;
 192 
 193         if (check_region(MS_MSE_CONTROL_PORT, 0x04))
 194                 return -ENODEV;
 195 
 196         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 197 
 198                 mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);
 199 
 200                 for (i = 0; i < 4; i++) {
 201                         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 202                                 if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)
 203                                         mouse.present = 1;
 204                                 else
 205                                         mouse.present = 0;
 206                         } else
 207                                 mouse.present = 0;
 208                 }
 209         }
 210         if (mouse.present == 0)
 211                 return -EIO;
 212         MS_MSE_INT_OFF();
 213         request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");
 214         printk("Microsoft BusMouse detected and installed.\n");
 215         mouse_register(&ms_bus_mouse);
 216         return 0;
 217 }
 218 
 219 #ifdef MODULE
 220 void cleanup_module(void)
     /*  */
 221 {
 222         if (MOD_IN_USE) {
 223                 printk("msbusmouse: in use, remove delayed\n");
 224                 return;
 225         }
 226         mouse_deregister(&ms_bus_mouse);
 227         release_region(MS_MSE_CONTROL_PORT, 0x04);
 228 }
 229 #endif
 230
/* */
root/drivers/char/msbusmouse.c

DEFINITIONS
