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Linux/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 #include <linux/platform_device.h>
 25 
 26 #include <asm/irq.h>
 27 #include <asm/setup.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_lastx, amimouse_lasty;
 37 
 38 static irqreturn_t amimouse_interrupt(int irq, void *data)
 39 {
 40         struct input_dev *dev = data;
 41         unsigned short joy0dat, potgor;
 42         int nx, ny, dx, dy;
 43 
 44         joy0dat = amiga_custom.joy0dat;
 45 
 46         nx = joy0dat & 0xff;
 47         ny = joy0dat >> 8;
 48 
 49         dx = nx - amimouse_lastx;
 50         dy = ny - amimouse_lasty;
 51 
 52         if (dx < -127) dx = (256 + nx) - amimouse_lastx;
 53         if (dx >  127) dx = (nx - 256) - amimouse_lastx;
 54         if (dy < -127) dy = (256 + ny) - amimouse_lasty;
 55         if (dy >  127) dy = (ny - 256) - amimouse_lasty;
 56 
 57         amimouse_lastx = nx;
 58         amimouse_lasty = ny;
 59 
 60         potgor = amiga_custom.potgor;
 61 
 62         input_report_rel(dev, REL_X, dx);
 63         input_report_rel(dev, REL_Y, dy);
 64 
 65         input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
 66         input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
 67         input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);
 68 
 69         input_sync(dev);
 70 
 71         return IRQ_HANDLED;
 72 }
 73 
 74 static int amimouse_open(struct input_dev *dev)
 75 {
 76         unsigned short joy0dat;
 77         int error;
 78 
 79         joy0dat = amiga_custom.joy0dat;
 80 
 81         amimouse_lastx = joy0dat & 0xff;
 82         amimouse_lasty = joy0dat >> 8;
 83 
 84         error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
 85                             dev);
 86         if (error)
 87                 dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);
 88 
 89         return error;
 90 }
 91 
 92 static void amimouse_close(struct input_dev *dev)
 93 {
 94         free_irq(IRQ_AMIGA_VERTB, dev);
 95 }
 96 
 97 static int __init amimouse_probe(struct platform_device *pdev)
 98 {
 99         int err;
100         struct input_dev *dev;
101 
102         dev = input_allocate_device();
103         if (!dev)
104                 return -ENOMEM;
105 
106         dev->name = pdev->name;
107         dev->phys = "amimouse/input0";
108         dev->id.bustype = BUS_AMIGA;
109         dev->id.vendor = 0x0001;
110         dev->id.product = 0x0002;
111         dev->id.version = 0x0100;
112 
113         dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
114         dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
115         dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
116                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
117         dev->open = amimouse_open;
118         dev->close = amimouse_close;
119         dev->dev.parent = &pdev->dev;
120 
121         err = input_register_device(dev);
122         if (err) {
123                 input_free_device(dev);
124                 return err;
125         }
126 
127         platform_set_drvdata(pdev, dev);
128 
129         return 0;
130 }
131 
132 static int __exit amimouse_remove(struct platform_device *pdev)
133 {
134         struct input_dev *dev = platform_get_drvdata(pdev);
135 
136         input_unregister_device(dev);
137         return 0;
138 }
139 
140 static struct platform_driver amimouse_driver = {
141         .remove = __exit_p(amimouse_remove),
142         .driver   = {
143                 .name   = "amiga-mouse",
144                 .owner  = THIS_MODULE,
145         },
146 };
147 
148 module_platform_driver_probe(amimouse_driver, amimouse_probe);
149 
150 MODULE_ALIAS("platform:amiga-mouse");
151 

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