drivers/input/mouse/amimouse.c

   1 /*
   2  *  Amiga mouse driver for Linux/m68k
   3  *
   4  *  Copyright (c) 2000-2002 Vojtech Pavlik
   5  *
   6  *  Based on the work of:
   7  *      Michael Rausch          James Banks
   8  *      Matther Dillon          David Giller
   9  *      Nathan Laredo           Linus Torvalds
  10  *      Johan Myreen            Jes Sorensen
  11  *      Russell King
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License version 2 as published by
  17  * the Free Software Foundation
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/input.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/setup.h>
  27 #include <asm/system.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/amigahw.h>
  30 #include <asm/amigaints.h>
  31
  32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  33 MODULE_DESCRIPTION("Amiga mouse driver");
  34 MODULE_LICENSE("GPL");
  35
  36 static int amimouse_used = 0;
  37 static int amimouse_lastx, amimouse_lasty;
  38 static struct input_dev amimouse_dev;
  39
  40 static char *amimouse_name = "Amiga mouse";
  41 static char *amimouse_phys = "amimouse/input0";
  42
  43 static irqreturn_t amimouse_interrupt(int irq, void *dummy, struct pt_regs *fp)
  44 {
  45         unsigned short joy0dat, potgor;
  46         int nx, ny, dx, dy;
  47
  48         joy0dat = custom.joy0dat;
  49
  50         nx = joy0dat & 0xff;
  51         ny = joy0dat >> 8;
  52
  53         dx = nx - amimouse_lastx;
  54         dy = ny - amimouse_lasty;
  55
  56         if (dx < -127) dx = (256 + nx) - amimouse_lastx;
  57         if (dx >  127) dx = (nx - 256) - amimouse_lastx;
  58         if (dy < -127) dy = (256 + ny) - amimouse_lasty;
  59         if (dy >  127) dy = (ny - 256) - amimouse_lasty;
  60
  61         amimouse_lastx = nx;
  62         amimouse_lasty = ny;
  63
  64         potgor = custom.potgor;
  65
  66         input_regs(&amimouse_dev, fp);
  67
  68         input_report_rel(&amimouse_dev, REL_X, dx);
  69         input_report_rel(&amimouse_dev, REL_Y, dy);
  70
  71         input_report_key(&amimouse_dev, BTN_LEFT,   ciaa.pra & 0x40);
  72         input_report_key(&amimouse_dev, BTN_MIDDLE, potgor & 0x0100);
  73         input_report_key(&amimouse_dev, BTN_RIGHT,  potgor & 0x0400);
  74
  75         input_sync(&amimouse_dev);
  76
  77         return IRQ_HANDLED;
  78 }
  79
  80 static int amimouse_open(struct input_dev *dev)
  81 {
  82         unsigned short joy0dat;
  83
  84         if (amimouse_used++)
  85                 return 0;
  86
  87         joy0dat = custom.joy0dat;
  88
  89         amimouse_lastx = joy0dat & 0xff;
  90         amimouse_lasty = joy0dat >> 8;
  91
  92         if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) {
  93                 amimouse_used--;
  94                 printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
  95                 return -EBUSY;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static void amimouse_close(struct input_dev *dev)
 102 {
 103         if (!--amimouse_used)
 104                 free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt);
 105 }
 106
 107 static int __init amimouse_init(void)
 108 {
 109         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
 110                 return -ENODEV;
 111
 112         amimouse_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
 113         amimouse_dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
 114         amimouse_dev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
 115         amimouse_dev.open = amimouse_open;
 116         amimouse_dev.close = amimouse_close;
 117
 118         amimouse_dev.name = amimouse_name;
 119         amimouse_dev.phys = amimouse_phys;
 120         amimouse_dev.id.bustype = BUS_AMIGA;
 121         amimouse_dev.id.vendor = 0x0001;
 122         amimouse_dev.id.product = 0x0002;
 123         amimouse_dev.id.version = 0x0100;
 124
 125         input_register_device(&amimouse_dev);
 126
 127         printk(KERN_INFO "input: %s at joy0dat\n", amimouse_name);
 128         return 0;
 129 }
 130
 131 static void __exit amimouse_exit(void)
 132 {
 133         input_unregister_device(&amimouse_dev);
 134 }
 135
 136 module_init(amimouse_init);
 137 module_exit(amimouse_exit);