1 /*
2 * Acorn RiscPC mouse driver for Linux/ARM
3 *
4 * Copyright (c) 2000-2002 Vojtech Pavlik
5 * Copyright (C) 1996-2002 Russell King
6 *
7 */
8
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.
13 *
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.
18 */
19
20 #include <linux/module.h>
21 #include <linux/ptrace.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.h>
24 #include <linux/input.h>
25
26 #include <asm/hardware.h>
27 #include <asm/irq.h>
28 #include <asm/io.h>
29 #include <asm/hardware/iomd.h>
30
31 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
32 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
33 MODULE_LICENSE("GPL");
34
35 static short rpcmouse_lastx, rpcmouse_lasty;
36 static struct input_dev *rpcmouse_dev;
37
38 static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
39 {
40 struct input_dev *dev = dev_id;
41 short x, y, dx, dy, b;
42
43 x = (short) iomd_readl(IOMD_MOUSEX);
44 y = (short) iomd_readl(IOMD_MOUSEY);
45 b = (short) (__raw_readl(0xe0310000) ^ 0x70);
46
47 dx = x - rpcmouse_lastx;
48 dy = y - rpcmouse_lasty;
49
50 rpcmouse_lastx = x;
51 rpcmouse_lasty = y;
52
53 input_report_rel(dev, REL_X, dx);
54 input_report_rel(dev, REL_Y, -dy);
55
56 input_report_key(dev, BTN_LEFT, b & 0x40);
57 input_report_key(dev, BTN_MIDDLE, b & 0x20);
58 input_report_key(dev, BTN_RIGHT, b & 0x10);
59
60 input_sync(dev);
61
62 return IRQ_HANDLED;
63 }
64
65
66 static int __init rpcmouse_init(void)
67 {
68 int err;
69
70 rpcmouse_dev = input_allocate_device();
71 if (!rpcmouse_dev)
72 return -ENOMEM;
73
74 rpcmouse_dev->name = "Acorn RiscPC Mouse";
75 rpcmouse_dev->phys = "rpcmouse/input0";
76 rpcmouse_dev->id.bustype = BUS_HOST;
77 rpcmouse_dev->id.vendor = 0x0005;
78 rpcmouse_dev->id.product = 0x0001;
79 rpcmouse_dev->id.version = 0x0100;
80
81 rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
82 rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
83 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
84 rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
85
86 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
87 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
88
89 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
90 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
91 err = -EBUSY;
92 goto err_free_dev;
93 }
94
95 err = input_register_device(rpcmouse_dev);
96 if (err)
97 goto err_free_irq;
98
99 return 0;
100
101 err_free_irq:
102 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
103 err_free_dev:
104 input_free_device(rpcmouse_dev);
105
106 return err;
107 }
108
109 static void __exit rpcmouse_exit(void)
110 {
111 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
112 input_unregister_device(rpcmouse_dev);
113 }
114
115 module_init(rpcmouse_init);
116 module_exit(rpcmouse_exit);
117
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