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1da177e4 LT |
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> | |
1da177e4 LT |
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; | |
2e5b636b | 36 | static struct input_dev *rpcmouse_dev; |
1da177e4 | 37 | |
7d12e780 | 38 | static irqreturn_t rpcmouse_irq(int irq, void *dev_id) |
1da177e4 LT |
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; | |
968ac842 | 48 | dy = y - rpcmouse_lasty; |
1da177e4 LT |
49 | |
50 | rpcmouse_lastx = x; | |
51 | rpcmouse_lasty = y; | |
52 | ||
1da177e4 LT |
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 | ||
2e5b636b | 65 | |
1da177e4 LT |
66 | static int __init rpcmouse_init(void) |
67 | { | |
72155615 DT |
68 | int err; |
69 | ||
70 | rpcmouse_dev = input_allocate_device(); | |
71 | if (!rpcmouse_dev) | |
2e5b636b DT |
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(EV_KEY) | BIT(EV_REL); | |
82 | rpcmouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT); | |
83 | rpcmouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y); | |
1da177e4 LT |
84 | |
85 | rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX); | |
86 | rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY); | |
87 | ||
dace1453 | 88 | if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) { |
1da177e4 | 89 | printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n"); |
72155615 DT |
90 | err = -EBUSY; |
91 | goto err_free_dev; | |
1da177e4 LT |
92 | } |
93 | ||
72155615 DT |
94 | err = input_register_device(rpcmouse_dev); |
95 | if (err) | |
96 | goto err_free_irq; | |
1da177e4 LT |
97 | |
98 | return 0; | |
72155615 DT |
99 | |
100 | err_free_irq: | |
101 | free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); | |
102 | err_free_dev: | |
103 | input_free_device(rpcmouse_dev); | |
104 | ||
105 | return err; | |
1da177e4 LT |
106 | } |
107 | ||
108 | static void __exit rpcmouse_exit(void) | |
109 | { | |
2e5b636b DT |
110 | free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); |
111 | input_unregister_device(rpcmouse_dev); | |
1da177e4 LT |
112 | } |
113 | ||
114 | module_init(rpcmouse_init); | |
115 | module_exit(rpcmouse_exit); |