Linux-2.6.12-rc2
[linux-2.6/kvm.git] / drivers / input / mouse / rpcmouse.c
blob7280f68afcee2a7dcf30bc098d1da05e2fbf6d78
1 /*
2 * Acorn RiscPC mouse driver for Linux/ARM
4 * Copyright (c) 2000-2002 Vojtech Pavlik
5 * Copyright (C) 1996-2002 Russell King
7 */
9 /*
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>
28 #include <asm/irq.h>
29 #include <asm/io.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;
38 static struct input_dev rpcmouse_dev = {
39 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
40 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT) },
41 .relbit = { BIT(REL_X) | BIT(REL_Y) },
42 .name = "Acorn RiscPC Mouse",
43 .phys = "rpcmouse/input0",
44 .id = {
45 .bustype = BUS_HOST,
46 .vendor = 0x0005,
47 .product = 0x0001,
48 .version = 0x0100,
52 static irqreturn_t rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs)
54 struct input_dev *dev = dev_id;
55 short x, y, dx, dy, b;
57 x = (short) iomd_readl(IOMD_MOUSEX);
58 y = (short) iomd_readl(IOMD_MOUSEY);
59 b = (short) (__raw_readl(0xe0310000) ^ 0x70);
61 dx = x - rpcmouse_lastx;
62 dy = y - rpcmouse_lasty;
64 rpcmouse_lastx = x;
65 rpcmouse_lasty = y;
67 input_regs(dev, regs);
69 input_report_rel(dev, REL_X, dx);
70 input_report_rel(dev, REL_Y, -dy);
72 input_report_key(dev, BTN_LEFT, b & 0x40);
73 input_report_key(dev, BTN_MIDDLE, b & 0x20);
74 input_report_key(dev, BTN_RIGHT, b & 0x10);
76 input_sync(dev);
78 return IRQ_HANDLED;
81 static int __init rpcmouse_init(void)
83 init_input_dev(&rpcmouse_dev);
85 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
86 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
88 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", &rpcmouse_dev)) {
89 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
90 return -1;
93 input_register_device(&rpcmouse_dev);
95 printk(KERN_INFO "input: Acorn RiscPC mouse\n");
97 return 0;
100 static void __exit rpcmouse_exit(void)
102 input_unregister_device(&rpcmouse_dev);
103 free_irq(IRQ_VSYNCPULSE, &rpcmouse_dev);
106 module_init(rpcmouse_init);
107 module_exit(rpcmouse_exit);