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logibm.c

/*
 * $Id: logibm.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *    James Banks       Matthew Dillon
 *    David Giller            Nathan Laredo
 *    Linus Torvalds          Johan Myreen
 *    Cliff Matthews          Philip Blundell
 *    Russell King
 */

/*
 * Logitech Bus Mouse Driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

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

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

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Logitech busmouse driver");
MODULE_LICENSE("GPL");

#define     LOGIBM_BASE       0x23c
#define     LOGIBM_EXTENT           4

#define     LOGIBM_DATA_PORT  LOGIBM_BASE + 0
#define     LOGIBM_SIGNATURE_PORT   LOGIBM_BASE + 1
#define     LOGIBM_CONTROL_PORT     LOGIBM_BASE + 2
#define     LOGIBM_CONFIG_PORT      LOGIBM_BASE + 3

#define     LOGIBM_ENABLE_IRQ 0x00
#define     LOGIBM_DISABLE_IRQ      0x10
#define     LOGIBM_READ_X_LOW 0x80
#define     LOGIBM_READ_X_HIGH      0xa0
#define     LOGIBM_READ_Y_LOW 0xc0
#define     LOGIBM_READ_Y_HIGH      0xe0

#define LOGIBM_DEFAULT_MODE   0x90
#define LOGIBM_CONFIG_BYTE    0x91
#define LOGIBM_SIGNATURE_BYTE 0xa5

#define LOGIBM_IRQ            5

static int logibm_irq = LOGIBM_IRQ;
module_param_named(irq, logibm_irq, uint, 0);
MODULE_PARM_DESC(irq, "IRQ number (5=default)");

static struct input_dev *logibm_dev;

static irqreturn_t logibm_interrupt(int irq, void *dev_id)
{
      char dx, dy;
      unsigned char buttons;

      outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
      dx = (inb(LOGIBM_DATA_PORT) & 0xf);
      outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
      dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
      outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
      dy = (inb(LOGIBM_DATA_PORT) & 0xf);
      outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
      buttons = inb(LOGIBM_DATA_PORT);
      dy |= (buttons & 0xf) << 4;
      buttons = ~buttons >> 5;

      input_report_rel(logibm_dev, REL_X, dx);
      input_report_rel(logibm_dev, REL_Y, dy);
      input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
      input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
      input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
      input_sync(logibm_dev);

      outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
      return IRQ_HANDLED;
}

static int logibm_open(struct input_dev *dev)
{
      if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
            printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
            return -EBUSY;
      }
      outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
      return 0;
}

static void logibm_close(struct input_dev *dev)
{
      outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
      free_irq(logibm_irq, NULL);
}

static int __init logibm_init(void)
{
      int err;

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

      outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
      outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
      udelay(100);

      if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
            printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
            err = -ENODEV;
            goto err_release_region;
      }

      outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
      outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);

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

      logibm_dev->name = "Logitech bus mouse";
      logibm_dev->phys = "isa023c/input0";
      logibm_dev->id.bustype = BUS_ISA;
      logibm_dev->id.vendor  = 0x0003;
      logibm_dev->id.product = 0x0001;
      logibm_dev->id.version = 0x0100;

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

      logibm_dev->open  = logibm_open;
      logibm_dev->close = logibm_close;

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

      return 0;

 err_free_dev:
      input_free_device(logibm_dev);
 err_release_region:
      release_region(LOGIBM_BASE, LOGIBM_EXTENT);

      return err;
}

static void __exit logibm_exit(void)
{
      input_unregister_device(logibm_dev);
      release_region(LOGIBM_BASE, LOGIBM_EXTENT);
}

module_init(logibm_init);
module_exit(logibm_exit);

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