input/mouse/rpcmouse.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  Acorn RiscPC mouse driver for Linux/ARM
0004  *
0005  *  Copyright (c) 2000-2002 Vojtech Pavlik
0006  *  Copyright (C) 1996-2002 Russell King
0007  */
0008
0009 /*
0010  *
0011  * This handles the Acorn RiscPCs mouse.  We basically have a couple of
0012  * hardware registers that track the sensor count for the X-Y movement and
0013  * another register holding the button state.  On every VSYNC interrupt we read
0014  * the complete state and then work out if something has changed.
0015  */
0016
0017 #include <linux/module.h>
0018 #include <linux/ptrace.h>
0019 #include <linux/interrupt.h>
0020 #include <linux/init.h>
0021 #include <linux/input.h>
0022 #include <linux/io.h>
0023
0024 #include <mach/hardware.h>
0025 #include <asm/irq.h>
0026 #include <asm/hardware/iomd.h>
0027
0028 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
0029 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
0030 MODULE_LICENSE("GPL");
0031
0032 static short rpcmouse_lastx, rpcmouse_lasty;
0033 static struct input_dev *rpcmouse_dev;
0034
0035 static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
0036 {
0037     struct input_dev *dev = dev_id;
0038     short x, y, dx, dy, b;
0039
0040     x = (short) iomd_readl(IOMD_MOUSEX);
0041     y = (short) iomd_readl(IOMD_MOUSEY);
0042     b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70);
0043
0044     dx = x - rpcmouse_lastx;
0045     dy = y - rpcmouse_lasty;
0046
0047     rpcmouse_lastx = x;
0048     rpcmouse_lasty = y;
0049
0050     input_report_rel(dev, REL_X, dx);
0051     input_report_rel(dev, REL_Y, -dy);
0052
0053     input_report_key(dev, BTN_LEFT,   b & 0x40);
0054     input_report_key(dev, BTN_MIDDLE, b & 0x20);
0055     input_report_key(dev, BTN_RIGHT,  b & 0x10);
0056
0057     input_sync(dev);
0058
0059     return IRQ_HANDLED;
0060 }
0061
0062
0063 static int __init rpcmouse_init(void)
0064 {
0065     int err;
0066
0067     rpcmouse_dev = input_allocate_device();
0068     if (!rpcmouse_dev)
0069         return -ENOMEM;
0070
0071     rpcmouse_dev->name = "Acorn RiscPC Mouse";
0072     rpcmouse_dev->phys = "rpcmouse/input0";
0073     rpcmouse_dev->id.bustype = BUS_HOST;
0074     rpcmouse_dev->id.vendor  = 0x0005;
0075     rpcmouse_dev->id.product = 0x0001;
0076     rpcmouse_dev->id.version = 0x0100;
0077
0078     rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
0079     rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
0080         BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
0081     rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
0082
0083     rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
0084     rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
0085
0086     if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
0087         printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
0088         err = -EBUSY;
0089         goto err_free_dev;
0090     }
0091
0092     err = input_register_device(rpcmouse_dev);
0093     if (err)
0094         goto err_free_irq;
0095
0096     return 0;
0097
0098  err_free_irq:
0099     free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
0100  err_free_dev:
0101     input_free_device(rpcmouse_dev);
0102
0103     return err;
0104 }
0105
0106 static void __exit rpcmouse_exit(void)
0107 {
0108     free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
0109     input_unregister_device(rpcmouse_dev);
0110 }
0111
0112 module_init(rpcmouse_init);
0113 module_exit(rpcmouse_exit);