1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Acorn RiscPC mouse driver for Linux/ARM |
4 | * |
5 | * Copyright (c) 2000-2002 Vojtech Pavlik |
6 | * Copyright (C) 1996-2002 Russell King |
7 | */ |
8 | |
9 | /* |
10 | * |
11 | * This handles the Acorn RiscPCs mouse. We basically have a couple of |
12 | * hardware registers that track the sensor count for the X-Y movement and |
13 | * another register holding the button state. On every VSYNC interrupt we read |
14 | * the complete state and then work out if something has changed. |
15 | */ |
16 | |
17 | #include <linux/module.h> |
18 | #include <linux/ptrace.h> |
19 | #include <linux/interrupt.h> |
20 | #include <linux/init.h> |
21 | #include <linux/input.h> |
22 | #include <linux/io.h> |
23 | |
24 | #include <mach/hardware.h> |
25 | #include <asm/irq.h> |
26 | #include <asm/hardware/iomd.h> |
27 | |
28 | MODULE_AUTHOR("Vojtech Pavlik, Russell King" ); |
29 | MODULE_DESCRIPTION("Acorn RiscPC mouse driver" ); |
30 | MODULE_LICENSE("GPL" ); |
31 | |
32 | static short rpcmouse_lastx, rpcmouse_lasty; |
33 | static struct input_dev *rpcmouse_dev; |
34 | |
35 | static irqreturn_t rpcmouse_irq(int irq, void *dev_id) |
36 | { |
37 | struct input_dev *dev = dev_id; |
38 | short x, y, dx, dy, b; |
39 | |
40 | x = (short) iomd_readl(IOMD_MOUSEX); |
41 | y = (short) iomd_readl(IOMD_MOUSEY); |
42 | b = (short) (__raw_readl(addr: IOMEM(0xe0310000)) ^ 0x70); |
43 | |
44 | dx = x - rpcmouse_lastx; |
45 | dy = y - rpcmouse_lasty; |
46 | |
47 | rpcmouse_lastx = x; |
48 | rpcmouse_lasty = y; |
49 | |
50 | input_report_rel(dev, REL_X, value: dx); |
51 | input_report_rel(dev, REL_Y, value: -dy); |
52 | |
53 | input_report_key(dev, BTN_LEFT, value: b & 0x40); |
54 | input_report_key(dev, BTN_MIDDLE, value: b & 0x20); |
55 | input_report_key(dev, BTN_RIGHT, value: b & 0x10); |
56 | |
57 | input_sync(dev); |
58 | |
59 | return IRQ_HANDLED; |
60 | } |
61 | |
62 | |
63 | static int __init rpcmouse_init(void) |
64 | { |
65 | int err; |
66 | |
67 | rpcmouse_dev = input_allocate_device(); |
68 | if (!rpcmouse_dev) |
69 | return -ENOMEM; |
70 | |
71 | rpcmouse_dev->name = "Acorn RiscPC Mouse" ; |
72 | rpcmouse_dev->phys = "rpcmouse/input0" ; |
73 | rpcmouse_dev->id.bustype = BUS_HOST; |
74 | rpcmouse_dev->id.vendor = 0x0005; |
75 | rpcmouse_dev->id.product = 0x0001; |
76 | rpcmouse_dev->id.version = 0x0100; |
77 | |
78 | rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); |
79 | rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) | |
80 | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); |
81 | rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); |
82 | |
83 | rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX); |
84 | rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY); |
85 | |
86 | if (request_irq(irq: IRQ_VSYNCPULSE, handler: rpcmouse_irq, IRQF_SHARED, name: "rpcmouse" , dev: rpcmouse_dev)) { |
87 | printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n" ); |
88 | err = -EBUSY; |
89 | goto err_free_dev; |
90 | } |
91 | |
92 | err = input_register_device(rpcmouse_dev); |
93 | if (err) |
94 | goto err_free_irq; |
95 | |
96 | return 0; |
97 | |
98 | err_free_irq: |
99 | free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); |
100 | err_free_dev: |
101 | input_free_device(dev: rpcmouse_dev); |
102 | |
103 | return err; |
104 | } |
105 | |
106 | static void __exit rpcmouse_exit(void) |
107 | { |
108 | free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); |
109 | input_unregister_device(rpcmouse_dev); |
110 | } |
111 | |
112 | module_init(rpcmouse_init); |
113 | module_exit(rpcmouse_exit); |
114 | |