// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 1999-2001 Vojtech Pavlik
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*
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* Based on the work of:
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* James Banks Matthew Dillon
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* David Giller Nathan Laredo
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* Linus Torvalds Johan Myreen
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* Cliff Matthews Philip Blundell
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* Russell King
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*/
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/*
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* Logitech Bus Mouse Driver for Linux
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*/
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/*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Logitech busmouse driver");
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MODULE_LICENSE("GPL");
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#define LOGIBM_BASE 0x23c
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#define LOGIBM_EXTENT 4
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#define LOGIBM_DATA_PORT LOGIBM_BASE + 0
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#define LOGIBM_SIGNATURE_PORT LOGIBM_BASE + 1
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#define LOGIBM_CONTROL_PORT LOGIBM_BASE + 2
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#define LOGIBM_CONFIG_PORT LOGIBM_BASE + 3
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#define LOGIBM_ENABLE_IRQ 0x00
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#define LOGIBM_DISABLE_IRQ 0x10
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#define LOGIBM_READ_X_LOW 0x80
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#define LOGIBM_READ_X_HIGH 0xa0
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#define LOGIBM_READ_Y_LOW 0xc0
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#define LOGIBM_READ_Y_HIGH 0xe0
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#define LOGIBM_DEFAULT_MODE 0x90
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#define LOGIBM_CONFIG_BYTE 0x91
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#define LOGIBM_SIGNATURE_BYTE 0xa5
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#define LOGIBM_IRQ 5
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static int logibm_irq = LOGIBM_IRQ;
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module_param_hw_named(irq, logibm_irq, uint, irq, 0);
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MODULE_PARM_DESC(irq, "IRQ number (5=default)");
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static struct input_dev *logibm_dev;
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static irqreturn_t logibm_interrupt(int irq, void *dev_id)
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{
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char dx, dy;
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unsigned char buttons;
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outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
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dx = (inb(LOGIBM_DATA_PORT) & 0xf);
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outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
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dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
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outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
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dy = (inb(LOGIBM_DATA_PORT) & 0xf);
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outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
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buttons = inb(LOGIBM_DATA_PORT);
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dy |= (buttons & 0xf) << 4;
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buttons = ~buttons >> 5;
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input_report_rel(logibm_dev, REL_X, dx);
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input_report_rel(logibm_dev, REL_Y, dy);
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input_report_key(logibm_dev, BTN_RIGHT, buttons & 1);
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input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
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input_report_key(logibm_dev, BTN_LEFT, buttons & 4);
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input_sync(logibm_dev);
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outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
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return IRQ_HANDLED;
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}
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static int logibm_open(struct input_dev *dev)
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{
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if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
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printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
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return -EBUSY;
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}
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outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
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return 0;
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}
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static void logibm_close(struct input_dev *dev)
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{
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outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
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free_irq(logibm_irq, NULL);
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}
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static int __init logibm_init(void)
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{
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int err;
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if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
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printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
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return -EBUSY;
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}
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outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
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outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
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udelay(100);
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if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
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printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
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err = -ENODEV;
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goto err_release_region;
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}
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outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
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outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
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logibm_dev = input_allocate_device();
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if (!logibm_dev) {
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printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
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err = -ENOMEM;
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goto err_release_region;
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}
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logibm_dev->name = "Logitech bus mouse";
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logibm_dev->phys = "isa023c/input0";
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logibm_dev->id.bustype = BUS_ISA;
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logibm_dev->id.vendor = 0x0003;
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logibm_dev->id.product = 0x0001;
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logibm_dev->id.version = 0x0100;
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logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
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logibm_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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logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
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logibm_dev->open = logibm_open;
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logibm_dev->close = logibm_close;
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err = input_register_device(logibm_dev);
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if (err)
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goto err_free_dev;
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return 0;
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err_free_dev:
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input_free_device(logibm_dev);
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err_release_region:
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release_region(LOGIBM_BASE, LOGIBM_EXTENT);
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return err;
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}
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static void __exit logibm_exit(void)
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{
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input_unregister_device(logibm_dev);
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release_region(LOGIBM_BASE, LOGIBM_EXTENT);
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}
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module_init(logibm_init);
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module_exit(logibm_exit);
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