drivers/char/adbmouse.c

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 1 /*
 2  * Macintosh ADB Mouse driver for Linux
 3  *
 4  * 27 Oct 1997 Michael Schmitz
 5  * logitech fixes by anthony tong
 6  * further hacking by Paul Mackerras
 7  *
 8  * Apple mouse protocol according to:
 9  *
 10  * Device code shamelessly stolen from:
 11  */
 12 /*
 13  * Atari Mouse Driver for Linux
 14  * by Robert de Vries (robert@and.nl) 19Jul93
 15  *
 16  * 16 Nov 1994 Andreas Schwab
 17  * Compatibility with busmouse
 18  * Support for three button mouse (shamelessly stolen from MiNT)
 19  * third button wired to one of the joystick directions on joystick 1
 20  *
 21  * 1996/02/11 Andreas Schwab
 22  * Module support
 23  * Allow multiple open's
 24  *
 25  * Converted to use new generic busmouse code. 11 July 1998
 26  * Russell King <rmk@arm.uk.linux.org>
 27  */
 28
 29 #include <linux/module.h>
 30
 31 #include <linux/sched.h>
 32 #include <linux/errno.h>
 33 #include <linux/miscdevice.h>
 34 #include <linux/mm.h>
 35 #include <linux/random.h>
 36 #include <linux/poll.h>
 37 #include <linux/init.h>
 38
 39 #include <asm/adb_mouse.h>
 40 #ifdef __powerpc__
 41 #include <asm/processor.h>
 42 #endif
 43 #if defined(__mc68000__) || defined(MODULE)
 44 #include <asm/setup.h>
 45 #endif
 46
 47 #include"busmouse.h"
 48
 49 static int msedev;
 50 static unsigned char adb_mouse_buttons[16];
 51
 52 externvoid(*adb_mouse_interrupt_hook)(unsigned char*,int);
 53 externint adb_emulate_buttons;
 54 externint adb_button2_keycode;
 55 externint adb_button3_keycode;
 56 externint console_loglevel;
 57
 58 /*
 59  * XXX: need to figure out what ADB mouse packets mean ...
 60  * This is the stuff stolen from the Atari driver ...
 61  */
 62 static voidadb_mouse_interrupt(unsigned char*buf,int nb)
 63 {
 64 int buttons, id;
 65 char dx, dy;
 66
 67 /*
 68  Handler 1 -- 100cpi original Apple mouse protocol.
 69  Handler 2 -- 200cpi original Apple mouse protocol.
 70
 71  For Apple's standard one-button mouse protocol the data array will
 72  contain the following values:
 73
 74  BITS COMMENTS
 75  data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd.
 76  data[1] = bxxx xxxx First button and x-axis motion.
 77  data[2] = byyy yyyy Second button and y-axis motion.
 78
 79  Handler 4 -- Apple Extended mouse protocol.
 80
 81  For Apple's 3-button mouse protocol the data array will contain the
 82  following values:
 83
 84  BITS COMMENTS
 85  data[0] = dddd 1100 ADB command: Talk, register 0, for device dddd.
 86  data[1] = bxxx xxxx Left button and x-axis motion.
 87  data[2] = byyy yyyy Second button and y-axis motion.
 88  data[3] = byyy bxxx Third button and fourth button.
 89  Y is additiona. high bits of y-axis motion.
 90  X is additional high bits of x-axis motion.
 91
 92  'buttons' here means 'button down' states!
 93  Button 1 (left) : bit 2, busmouse button 3
 94  Button 2 (right) : bit 0, busmouse button 1
 95  Button 3 (middle): bit 1, busmouse button 2
 96  */
 97
 98 /* x/y and buttons swapped */
 99
 100  id = (buf[0] >>4) &0xf;
 101
 102  buttons = adb_mouse_buttons[id];
 103
 104 /* button 1 (left, bit 2) */
 105  buttons = (buttons &3) | (buf[1] &0x80?4:0);/* 1+2 unchanged */
 106
 107 /* button 2 (middle) */
 108  buttons = (buttons &5) | (buf[2] &0x80?2:0);/* 2+3 unchanged */
 109
 110 /* button 3 (right) present?
 111  * on a logitech mouseman, the right and mid buttons sometimes behave
 112  * strangely until they both have been pressed after booting. */
 113 /* data valid only if extended mouse format ! */
 114 if(nb >=4)
 115  buttons = (buttons &6) | (buf[3] &0x80?1:0);/* 1+3 unchanged */
 116
 117  adb_mouse_buttons[id] = buttons;
 118
 119 /* a button is down if it is down on any mouse */
 120 for(id =0; id <16; ++id)
 121  buttons &= adb_mouse_buttons[id];
 122
 123  dx = ((buf[2] &0x7f) <64? (buf[2] &0x7f) : (buf[2] &0x7f) -128);
 124  dy = ((buf[1] &0x7f) <64? (buf[1] &0x7f) : (buf[1] &0x7f) -128);
 125 busmouse_add_movementbuttons(msedev, dx, -dy, buttons);
 126
 127 if(console_loglevel >=8)
 128 printk(" %X %X %X dx %d dy %d\n",
 129  buf[1], buf[2], buf[3], dx, dy);
 130 }
 131
 132 static intrelease_mouse(struct inode *inode,struct file *file)
 133 {
 134  adb_mouse_interrupt_hook = NULL;
 135  MOD_DEC_USE_COUNT;
 136 return0;
 137 }
 138
 139 static intopen_mouse(struct inode *inode,struct file *file)
 140 {
 141  MOD_INC_USE_COUNT;
 142  adb_mouse_interrupt_hook = adb_mouse_interrupt;
 143 return0;
 144 }
 145
 146 static struct busmouse adb_mouse =
 147 {
 148  ADB_MOUSE_MINOR,"adbmouse", open_mouse, release_mouse,7
 149 };
 150
 151 int __init adb_mouse_init(void)
 152 {
 153 #ifdef __powerpc__
 154 if((_machine != _MACH_chrp) && (_machine != _MACH_Pmac))
 155 return-ENODEV;
 156 #endif
 157 #ifdef __mc68000__
 158 if(!MACH_IS_MAC)
 159 return-ENODEV;
 160 #endif
 161
 162  msedev =register_busmouse(&adb_mouse);
 163 if(msedev <0)
 164 printk(KERN_WARNING "Unable to register ADB mouse driver.\n");
 165 else
 166 printk(KERN_INFO "Macintosh ADB mouse driver installed.\n");
 167
 168 return msedev <0? msedev :0;
 169 }
 170
 171 /*
 172  * XXX this function is misnamed.
 173  * It is called if the kernel is booted with the adb_buttons=xxx
 174  * option, which is about using ADB keyboard buttons to emulate
 175  * mouse buttons. -- paulus
 176  */
 177 static int __init adb_mouse_setup(char*str)
 178 {
 179 int ints[4];
 180
 181  str =get_options(str,ARRAY_SIZE(ints), ints);
 182 if(ints[0] >=1) {
 183  adb_emulate_buttons = ints[1];
 184 if(ints[0] >=2)
 185  adb_button2_keycode = ints[2];
 186 if(ints[0] >=3)
 187  adb_button3_keycode = ints[3];
 188 }
 189 return1;
 190 }
 191
 192 __setup("adb_buttons=", adb_mouse_setup);
 193
 194 #ifdef MODULE
 195 intinit_module(void)
 196 {
 197 returnadb_mouse_init();
 198 }
 199
 200 voidcleanup_module(void)
 201 {
 202 unregister_busmouse(msedev);
 203 }
 204
 205 #endif