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 
rpcmouse_irq(int irq,void * dev_id)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(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, dx);
51 	input_report_rel(dev, REL_Y, -dy);
52 
53 	input_report_key(dev, BTN_LEFT,   b & 0x40);
54 	input_report_key(dev, BTN_MIDDLE, b & 0x20);
55 	input_report_key(dev, BTN_RIGHT,  b & 0x10);
56 
57 	input_sync(dev);
58 
59 	return IRQ_HANDLED;
60 }
61 
62 
rpcmouse_init(void)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_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", 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(rpcmouse_dev);
102 
103 	return err;
104 }
105 
rpcmouse_exit(void)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