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_lastx, amimouse_lasty; 37 static struct input_dev amimouse_dev; 38 39 static char *amimouse_name = "Amiga mouse"; 40 static char *amimouse_phys = "amimouse/input0"; 41 42 static irqreturn_t amimouse_interrupt(int irq, void *dummy, struct pt_regs *fp) 43 { 44 unsigned short joy0dat, potgor; 45 int nx, ny, dx, dy; 46 47 joy0dat = custom.joy0dat; 48 49 nx = joy0dat & 0xff; 50 ny = joy0dat >> 8; 51 52 dx = nx - amimouse_lastx; 53 dy = ny - amimouse_lasty; 54 55 if (dx < -127) dx = (256 + nx) - amimouse_lastx; 56 if (dx > 127) dx = (nx - 256) - amimouse_lastx; 57 if (dy < -127) dy = (256 + ny) - amimouse_lasty; 58 if (dy > 127) dy = (ny - 256) - amimouse_lasty; 59 60 amimouse_lastx = nx; 61 amimouse_lasty = ny; 62 63 potgor = custom.potgor; 64 65 input_regs(&amimouse_dev, fp); 66 67 input_report_rel(&amimouse_dev, REL_X, dx); 68 input_report_rel(&amimouse_dev, REL_Y, dy); 69 70 input_report_key(&amimouse_dev, BTN_LEFT, ciaa.pra & 0x40); 71 input_report_key(&amimouse_dev, BTN_MIDDLE, potgor & 0x0100); 72 input_report_key(&amimouse_dev, BTN_RIGHT, potgor & 0x0400); 73 74 input_sync(&amimouse_dev); 75 76 return IRQ_HANDLED; 77 } 78 79 static int amimouse_open(struct input_dev *dev) 80 { 81 unsigned short joy0dat; 82 83 joy0dat = custom.joy0dat; 84 85 amimouse_lastx = joy0dat & 0xff; 86 amimouse_lasty = joy0dat >> 8; 87 88 if (request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse", amimouse_interrupt)) { 89 printk(KERN_ERR "amimouse.c: Can't allocate irq %d\n", IRQ_AMIGA_VERTB); 90 return -EBUSY; 91 } 92 93 return 0; 94 } 95 96 static void amimouse_close(struct input_dev *dev) 97 { 98 free_irq(IRQ_AMIGA_VERTB, amimouse_interrupt); 99 } 100 101 static int __init amimouse_init(void) 102 { 103 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE)) 104 return -ENODEV; 105 106 amimouse_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL); 107 amimouse_dev.relbit[0] = BIT(REL_X) | BIT(REL_Y); 108 amimouse_dev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT); 109 amimouse_dev.open = amimouse_open; 110 amimouse_dev.close = amimouse_close; 111 112 amimouse_dev.name = amimouse_name; 113 amimouse_dev.phys = amimouse_phys; 114 amimouse_dev.id.bustype = BUS_AMIGA; 115 amimouse_dev.id.vendor = 0x0001; 116 amimouse_dev.id.product = 0x0002; 117 amimouse_dev.id.version = 0x0100; 118 119 input_register_device(&amimouse_dev); 120 121 printk(KERN_INFO "input: %s at joy0dat\n", amimouse_name); 122 return 0; 123 } 124 125 static void __exit amimouse_exit(void) 126 { 127 input_unregister_device(&amimouse_dev); 128 } 129 130 module_init(amimouse_init); 131 module_exit(amimouse_exit); 132