// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Acorn RiscPC mouse driver for Linux/ARM
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*
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* Copyright (c) 2000-2002 Vojtech Pavlik
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* Copyright (C) 1996-2002 Russell King
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*/
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/*
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*
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* This handles the Acorn RiscPCs mouse. We basically have a couple of
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* hardware registers that track the sensor count for the X-Y movement and
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* another register holding the button state. On every VSYNC interrupt we read
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* the complete state and then work out if something has changed.
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*/
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#include <asm/hardware/iomd.h>
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MODULE_AUTHOR("Vojtech Pavlik, Russell King");
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MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
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MODULE_LICENSE("GPL");
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static short rpcmouse_lastx, rpcmouse_lasty;
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static struct input_dev *rpcmouse_dev;
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static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
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{
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struct input_dev *dev = dev_id;
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short x, y, dx, dy, b;
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x = (short) iomd_readl(IOMD_MOUSEX);
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y = (short) iomd_readl(IOMD_MOUSEY);
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b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70);
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dx = x - rpcmouse_lastx;
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dy = y - rpcmouse_lasty;
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rpcmouse_lastx = x;
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rpcmouse_lasty = y;
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input_report_rel(dev, REL_X, dx);
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input_report_rel(dev, REL_Y, -dy);
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input_report_key(dev, BTN_LEFT, b & 0x40);
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input_report_key(dev, BTN_MIDDLE, b & 0x20);
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input_report_key(dev, BTN_RIGHT, b & 0x10);
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input_sync(dev);
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return IRQ_HANDLED;
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}
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static int __init rpcmouse_init(void)
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{
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int err;
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rpcmouse_dev = input_allocate_device();
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if (!rpcmouse_dev)
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return -ENOMEM;
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rpcmouse_dev->name = "Acorn RiscPC Mouse";
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rpcmouse_dev->phys = "rpcmouse/input0";
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rpcmouse_dev->id.bustype = BUS_HOST;
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rpcmouse_dev->id.vendor = 0x0005;
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rpcmouse_dev->id.product = 0x0001;
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rpcmouse_dev->id.version = 0x0100;
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rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
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rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
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BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
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rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
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rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
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rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
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if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
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printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
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err = -EBUSY;
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goto err_free_dev;
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}
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err = input_register_device(rpcmouse_dev);
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if (err)
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goto err_free_irq;
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return 0;
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err_free_irq:
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free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
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err_free_dev:
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input_free_device(rpcmouse_dev);
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return err;
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}
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static void __exit rpcmouse_exit(void)
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{
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free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
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input_unregister_device(rpcmouse_dev);
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}
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module_init(rpcmouse_init);
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module_exit(rpcmouse_exit);
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