// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	Teemu Rantanen		Derrick Cole
 *	Peter Cervasio		Christoph Niemann
 *	Philip Blundell		Russell King
 *	Bob Harris
 */

/*
 * Inport (ATI XL and Microsoft) busmouse driver for Linux
 */

/*
 */

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/input.h>

#include <asm/io.h>
#include <asm/irq.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Inport (ATI XL and Microsoft) busmouse driver");
MODULE_LICENSE("GPL");

#define INPORT_BASE		0x23c
#define INPORT_EXTENT		4

#define INPORT_CONTROL_PORT	INPORT_BASE + 0
#define INPORT_DATA_PORT	INPORT_BASE + 1
#define INPORT_SIGNATURE_PORT	INPORT_BASE + 2

#define INPORT_REG_BTNS	0x00
#define INPORT_REG_X		0x01
#define INPORT_REG_Y		0x02
#define INPORT_REG_MODE		0x07
#define INPORT_RESET		0x80

#ifdef CONFIG_MOUSE_ATIXL
#define INPORT_NAME		"ATI XL Mouse"
#define INPORT_VENDOR		0x0002
#define INPORT_SPEED_30HZ	0x01
#define INPORT_SPEED_50HZ	0x02
#define INPORT_SPEED_100HZ	0x03
#define INPORT_SPEED_200HZ	0x04
#define INPORT_MODE_BASE	INPORT_SPEED_100HZ
#define INPORT_MODE_IRQ		0x08
#else
#define INPORT_NAME		"Microsoft InPort Mouse"
#define INPORT_VENDOR		0x0001
#define INPORT_MODE_BASE	0x10
#define INPORT_MODE_IRQ		0x01
#endif
#define INPORT_MODE_HOLD	0x20

#define INPORT_IRQ		5

static int inport_irq = INPORT_IRQ;
module_param_hw_named(irq, inport_irq, uint, irq, 0);
MODULE_PARM_DESC(irq, "IRQ number (5=default)");

static struct input_dev *inport_dev;

static irqreturn_t inport_interrupt(int irq, void *dev_id)
{
	unsigned char buttons;

	outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
	outb(INPORT_MODE_HOLD | INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);

	outb(INPORT_REG_X, INPORT_CONTROL_PORT);
	input_report_rel(inport_dev, REL_X, inb(INPORT_DATA_PORT));

	outb(INPORT_REG_Y, INPORT_CONTROL_PORT);
	input_report_rel(inport_dev, REL_Y, inb(INPORT_DATA_PORT));

	outb(INPORT_REG_BTNS, INPORT_CONTROL_PORT);
	buttons = inb(INPORT_DATA_PORT);

	input_report_key(inport_dev, BTN_MIDDLE, buttons & 1);
	input_report_key(inport_dev, BTN_LEFT,   buttons & 2);
	input_report_key(inport_dev, BTN_RIGHT,  buttons & 4);

	outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
	outb(INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);

	input_sync(inport_dev);
	return IRQ_HANDLED;
}

static int inport_open(struct input_dev *dev)
{
	if (request_irq(inport_irq, inport_interrupt, 0, "inport", NULL))
		return -EBUSY;
	outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
	outb(INPORT_MODE_IRQ | INPORT_MODE_BASE, INPORT_DATA_PORT);

	return 0;
}

static void inport_close(struct input_dev *dev)
{
	outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
	outb(INPORT_MODE_BASE, INPORT_DATA_PORT);
	free_irq(inport_irq, NULL);
}

static int __init inport_init(void)
{
	unsigned char a, b, c;
	int err;

	if (!request_region(INPORT_BASE, INPORT_EXTENT, "inport")) {
		printk(KERN_ERR "inport.c: Can't allocate ports at %#x\n", INPORT_BASE);
		return -EBUSY;
	}

	a = inb(INPORT_SIGNATURE_PORT);
	b = inb(INPORT_SIGNATURE_PORT);
	c = inb(INPORT_SIGNATURE_PORT);
	if (a == b || a != c) {
		printk(KERN_INFO "inport.c: Didn't find InPort mouse at %#x\n", INPORT_BASE);
		err = -ENODEV;
		goto err_release_region;
	}

	inport_dev = input_allocate_device();
	if (!inport_dev) {
		printk(KERN_ERR "inport.c: Not enough memory for input device\n");
		err = -ENOMEM;
		goto err_release_region;
	}

	inport_dev->name = INPORT_NAME;
	inport_dev->phys = "isa023c/input0";
	inport_dev->id.bustype = BUS_ISA;
	inport_dev->id.vendor  = INPORT_VENDOR;
	inport_dev->id.product = 0x0001;
	inport_dev->id.version = 0x0100;

	inport_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	inport_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
	inport_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

	inport_dev->open  = inport_open;
	inport_dev->close = inport_close;

	outb(INPORT_RESET, INPORT_CONTROL_PORT);
	outb(INPORT_REG_MODE, INPORT_CONTROL_PORT);
	outb(INPORT_MODE_BASE, INPORT_DATA_PORT);

	err = input_register_device(inport_dev);
	if (err)
		goto err_free_dev;

	return 0;

 err_free_dev:
	input_free_device(inport_dev);
 err_release_region:
	release_region(INPORT_BASE, INPORT_EXTENT);

	return err;
}

static void __exit inport_exit(void)
{
	input_unregister_device(inport_dev);
	release_region(INPORT_BASE, INPORT_EXTENT);
}

module_init(inport_init);
module_exit(inport_exit);