1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Acorn RiscPC mouse driver for Linux/ARM
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2000-2002 Vojtech Pavlik
6*4882a593Smuzhiyun * Copyright (C) 1996-2002 Russell King
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * This handles the Acorn RiscPCs mouse. We basically have a couple of
12*4882a593Smuzhiyun * hardware registers that track the sensor count for the X-Y movement and
13*4882a593Smuzhiyun * another register holding the button state. On every VSYNC interrupt we read
14*4882a593Smuzhiyun * the complete state and then work out if something has changed.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <linux/module.h>
18*4882a593Smuzhiyun #include <linux/ptrace.h>
19*4882a593Smuzhiyun #include <linux/interrupt.h>
20*4882a593Smuzhiyun #include <linux/init.h>
21*4882a593Smuzhiyun #include <linux/input.h>
22*4882a593Smuzhiyun #include <linux/io.h>
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #include <mach/hardware.h>
25*4882a593Smuzhiyun #include <asm/irq.h>
26*4882a593Smuzhiyun #include <asm/hardware/iomd.h>
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun MODULE_AUTHOR("Vojtech Pavlik, Russell King");
29*4882a593Smuzhiyun MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
30*4882a593Smuzhiyun MODULE_LICENSE("GPL");
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun static short rpcmouse_lastx, rpcmouse_lasty;
33*4882a593Smuzhiyun static struct input_dev *rpcmouse_dev;
34*4882a593Smuzhiyun
rpcmouse_irq(int irq,void * dev_id)35*4882a593Smuzhiyun static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun struct input_dev *dev = dev_id;
38*4882a593Smuzhiyun short x, y, dx, dy, b;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun x = (short) iomd_readl(IOMD_MOUSEX);
41*4882a593Smuzhiyun y = (short) iomd_readl(IOMD_MOUSEY);
42*4882a593Smuzhiyun b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun dx = x - rpcmouse_lastx;
45*4882a593Smuzhiyun dy = y - rpcmouse_lasty;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun rpcmouse_lastx = x;
48*4882a593Smuzhiyun rpcmouse_lasty = y;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun input_report_rel(dev, REL_X, dx);
51*4882a593Smuzhiyun input_report_rel(dev, REL_Y, -dy);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun input_report_key(dev, BTN_LEFT, b & 0x40);
54*4882a593Smuzhiyun input_report_key(dev, BTN_MIDDLE, b & 0x20);
55*4882a593Smuzhiyun input_report_key(dev, BTN_RIGHT, b & 0x10);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun input_sync(dev);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return IRQ_HANDLED;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun
rpcmouse_init(void)63*4882a593Smuzhiyun static int __init rpcmouse_init(void)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun int err;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun rpcmouse_dev = input_allocate_device();
68*4882a593Smuzhiyun if (!rpcmouse_dev)
69*4882a593Smuzhiyun return -ENOMEM;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun rpcmouse_dev->name = "Acorn RiscPC Mouse";
72*4882a593Smuzhiyun rpcmouse_dev->phys = "rpcmouse/input0";
73*4882a593Smuzhiyun rpcmouse_dev->id.bustype = BUS_HOST;
74*4882a593Smuzhiyun rpcmouse_dev->id.vendor = 0x0005;
75*4882a593Smuzhiyun rpcmouse_dev->id.product = 0x0001;
76*4882a593Smuzhiyun rpcmouse_dev->id.version = 0x0100;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
79*4882a593Smuzhiyun rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
80*4882a593Smuzhiyun BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
81*4882a593Smuzhiyun rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
84*4882a593Smuzhiyun rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
87*4882a593Smuzhiyun printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
88*4882a593Smuzhiyun err = -EBUSY;
89*4882a593Smuzhiyun goto err_free_dev;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun err = input_register_device(rpcmouse_dev);
93*4882a593Smuzhiyun if (err)
94*4882a593Smuzhiyun goto err_free_irq;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return 0;
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun err_free_irq:
99*4882a593Smuzhiyun free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
100*4882a593Smuzhiyun err_free_dev:
101*4882a593Smuzhiyun input_free_device(rpcmouse_dev);
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun return err;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
rpcmouse_exit(void)106*4882a593Smuzhiyun static void __exit rpcmouse_exit(void)
107*4882a593Smuzhiyun {
108*4882a593Smuzhiyun free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
109*4882a593Smuzhiyun input_unregister_device(rpcmouse_dev);
110*4882a593Smuzhiyun }
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun module_init(rpcmouse_init);
113*4882a593Smuzhiyun module_exit(rpcmouse_exit);
114