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
init_module
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 #include <linux/module.h>
  34 
  35 #include <linux/kernel.h>
  36 #include <linux/ioport.h>
  37 #include <linux/sched.h>
  38 #include <linux/busmouse.h>
  39 #include <linux/signal.h>
  40 #include <linux/errno.h>
  41 #include <linux/mouse.h>
  42 #include <linux/random.h>
  43 
  44 #include <asm/io.h>
  45 #include <asm/segment.h>
  46 #include <asm/system.h>
  47 #include <asm/irq.h>
  48 
  49 static struct mouse_status mouse;
  50 
  51 static void ms_mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /*  */
  52 {
  53         char dx, dy;
  54         unsigned char buttons;
  55 
  56         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  57         outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);
  58 
  59         outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);
  60         dx = inb(MS_MSE_DATA_PORT);
  61 
  62         outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);
  63         dy = inb(MS_MSE_DATA_PORT);
  64 
  65         outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);
  66         buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;
  67 
  68         outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
  69         outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);
  70 
  71         if (dx != 0 || dy != 0 || buttons != mouse.buttons || ((~buttons) & 0x07)) {
  72                 add_mouse_randomness((buttons << 16) + (dy << 8) + dx);
  73                 mouse.buttons = buttons;
  74                 mouse.dx += dx;
  75                 mouse.dy += dy;
  76                 mouse.ready = 1;
  77                 wake_up_interruptible(&mouse.wait);
  78                 if (mouse.fasyncptr)
  79                         kill_fasync(mouse.fasyncptr, SIGIO);
  80         }
  81 }
  82 
  83 static int fasync_mouse(struct inode *inode, struct file *filp, int on)
     /*  */
  84 {
  85         int retval;
  86 
  87         retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
  88         if (retval < 0)
  89                 return retval;
  90         return 0;
  91 }
  92 
  93 static void release_mouse(struct inode * inode, struct file * file)
     /*  */
  94 {
  95         fasync_mouse(inode, file, 0);
  96         if (--mouse.active)
  97                 return;
  98         MS_MSE_INT_OFF();
  99         mouse.ready = 0; 
 100         free_irq(MOUSE_IRQ, NULL);
 101         MOD_DEC_USE_COUNT;
 102 }
 103 
 104 static int open_mouse(struct inode * inode, struct file * file)
     /*  */
 105 {
 106         if (!mouse.present)
 107                 return -EINVAL;
 108         if (mouse.active++)
 109                 return 0;
 110         if (request_irq(MOUSE_IRQ, ms_mouse_interrupt, 0, "MS Busmouse", NULL)) {
 111                 mouse.active--;
 112                 return -EBUSY;
 113         }
 114         mouse.ready = mouse.dx = mouse.dy = 0;  
 115         mouse.buttons = 0x80;
 116         outb(MS_MSE_START, MS_MSE_CONTROL_PORT);
 117         MOD_INC_USE_COUNT;
 118         MS_MSE_INT_ON();        
 119         return 0;
 120 }
 121 
 122 
 123 static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)
     /*  */
 124 {
 125         return -EINVAL;
 126 }
 127 
 128 static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)
     /*  */
 129 {
 130         int i, dx, dy;
 131 
 132         if (count < 3)
 133                 return -EINVAL;
 134         if (!mouse.ready)
 135                 return -EAGAIN;
 136         put_user(mouse.buttons | 0x80, buffer);
 137         dx = mouse.dx < -127 ? -127 : mouse.dx > 127 ?  127 :  mouse.dx;
 138         dy = mouse.dy < -127 ?  127 : mouse.dy > 127 ? -127 : -mouse.dy;
 139         put_user((char)dx, buffer + 1);
 140         put_user((char)dy, buffer + 2);
 141         for (i = 3; i < count; i++)
 142                 put_user(0x00, buffer + i);
 143         mouse.dx -= dx;
 144         mouse.dy += dy;
 145         mouse.ready = 0;
 146         return i;       
 147 }
 148 
 149 static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
     /*  */
 150 {
 151         if (sel_type != SEL_IN)
 152                 return 0;
 153         if (mouse.ready) 
 154                 return 1;
 155         select_wait(&mouse.wait,wait);
 156         return 0;
 157 }
 158 
 159 struct file_operations ms_bus_mouse_fops = {
 160         NULL,           /* mouse_seek */
 161         read_mouse,
 162         write_mouse,
 163         NULL,           /* mouse_readdir */
 164         mouse_select,   /* mouse_select */
 165         NULL,           /* mouse_ioctl */
 166         NULL,           /* mouse_mmap */
 167         open_mouse,
 168         release_mouse,
 169         NULL,
 170         fasync_mouse,
 171 };
 172 
 173 static struct mouse ms_bus_mouse = {
 174         MICROSOFT_BUSMOUSE, "msbusmouse", &ms_bus_mouse_fops
 175 };
 176 
 177 int ms_bus_mouse_init(void)
     /*  */
 178 {
 179         int mse_byte, i;
 180 
 181         mouse.present = mouse.active = mouse.ready = 0;
 182         mouse.buttons = 0x80;
 183         mouse.dx = mouse.dy = 0;
 184         mouse.wait = NULL;
 185 
 186         if (check_region(MS_MSE_CONTROL_PORT, 0x04))
 187                 return -ENODEV;
 188 
 189         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 190 
 191                 mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);
 192 
 193                 for (i = 0; i < 4; i++) {
 194                         if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
 195                                 if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)
 196                                         mouse.present = 1;
 197                                 else
 198                                         mouse.present = 0;
 199                         } else
 200                                 mouse.present = 0;
 201                 }
 202         }
 203         if (mouse.present == 0)
 204                 return -EIO;
 205         MS_MSE_INT_OFF();
 206         request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");
 207         printk("Microsoft BusMouse detected and installed.\n");
 208         mouse_register(&ms_bus_mouse);
 209         return 0;
 210 }
 211 
 212 #ifdef MODULE
 213 int init_module(void)
     /*  */
 214 {
 215         return ms_bus_mouse_init();
 216 }
 217 
 218 void cleanup_module(void)
     /*  */
 219 {
 220         mouse_deregister(&ms_bus_mouse);
 221         release_region(MS_MSE_CONTROL_PORT, 0x04);
 222 }
 223 #endif
 224
/* */
root/drivers/char/msbusmouse.c

DEFINITIONS
