2 * Acorn RiscPC mouse driver for Linux/ARM
4 * Copyright (c) 2000-2002 Vojtech Pavlik
5 * Copyright (C) 1996-2002 Russell King
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
14 * This handles the Acorn RiscPCs mouse. We basically have a couple of
15 * hardware registers that track the sensor count for the X-Y movement and
16 * another register holding the button state. On every VSYNC interrupt we read
17 * the complete state and then work out if something has changed.
20 #include <linux/module.h>
21 #include <linux/sched.h>
22 #include <linux/ptrace.h>
23 #include <linux/interrupt.h>
24 #include <linux/init.h>
25 #include <linux/input.h>
27 #include <asm/hardware.h>
30 #include <asm/hardware/iomd.h>
32 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
33 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
34 MODULE_LICENSE("GPL");
36 static short rpcmouse_lastx, rpcmouse_lasty;
37 static struct input_dev *rpcmouse_dev;
39 static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
41 struct input_dev *dev = dev_id;
42 short x, y, dx, dy, b;
44 x = (short) iomd_readl(IOMD_MOUSEX);
45 y = (short) iomd_readl(IOMD_MOUSEY);
46 b = (short) (__raw_readl(0xe0310000) ^ 0x70);
48 dx = x - rpcmouse_lastx;
49 dy = y - rpcmouse_lasty;
54 input_report_rel(dev, REL_X, dx);
55 input_report_rel(dev, REL_Y, -dy);
57 input_report_key(dev, BTN_LEFT, b & 0x40);
58 input_report_key(dev, BTN_MIDDLE, b & 0x20);
59 input_report_key(dev, BTN_RIGHT, b & 0x10);
67 static int __init rpcmouse_init(void)
71 rpcmouse_dev = input_allocate_device();
75 rpcmouse_dev->name = "Acorn RiscPC Mouse";
76 rpcmouse_dev->phys = "rpcmouse/input0";
77 rpcmouse_dev->id.bustype = BUS_HOST;
78 rpcmouse_dev->id.vendor = 0x0005;
79 rpcmouse_dev->id.product = 0x0001;
80 rpcmouse_dev->id.version = 0x0100;
82 rpcmouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
83 rpcmouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
84 rpcmouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
86 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
87 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
89 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
90 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
95 err = input_register_device(rpcmouse_dev);
102 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
104 input_free_device(rpcmouse_dev);
109 static void __exit rpcmouse_exit(void)
111 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
112 input_unregister_device(rpcmouse_dev);
115 module_init(rpcmouse_init);
116 module_exit(rpcmouse_exit);