LXR linux/drivers/input/mouse/pc110pad.c

   1/*
   2 *  Copyright (c) 2000-2001 Vojtech Pavlik
   3 *
   4 *  Based on the work of:
   5 *      Alan Cox        Robin O'Leary
   6 */
   7
   8/*
   9 * IBM PC110 touchpad driver for Linux
  10 */
  11
  12/*
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26 *
  27 * Should you need to contact me, the author, you can do so either by
  28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30 */
  31
  32#include <linux/module.h>
  33#include <linux/kernel.h>
  34#include <linux/errno.h>
  35#include <linux/ioport.h>
  36#include <linux/input.h>
  37#include <linux/init.h>
  38#include <linux/interrupt.h>
  39#include <linux/pci.h>
  40#include <linux/delay.h>
  41
  42#include <asm/io.h>
  43#include <asm/irq.h>
  44
  45MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  46MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  47MODULE_LICENSE("GPL");
  48
  49#define PC110PAD_OFF    0x30
  50#define PC110PAD_ON     0x38
  51
  52static int pc110pad_irq = 10;
  53static int pc110pad_io = 0x15e0;
  54
  55static struct input_dev *pc110pad_dev;
  56static int pc110pad_data[3];
  57static int pc110pad_count;
  58
  59static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
  60{
  61        int value     = inb_p(pc110pad_io);
  62        int handshake = inb_p(pc110pad_io + 2);
  63
  64        outb(handshake |  1, pc110pad_io + 2);
  65        udelay(2);
  66        outb(handshake & ~1, pc110pad_io + 2);
  67        udelay(2);
  68        inb_p(0x64);
  69
  70        pc110pad_data[pc110pad_count++] = value;
  71
  72        if (pc110pad_count < 3)
  73                return IRQ_HANDLED;
  74
  75        input_report_key(pc110pad_dev, BTN_TOUCH,
  76                pc110pad_data[0] & 0x01);
  77        input_report_abs(pc110pad_dev, ABS_X,
  78                pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  79        input_report_abs(pc110pad_dev, ABS_Y,
  80                pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  81        input_sync(pc110pad_dev);
  82
  83        pc110pad_count = 0;
  84        return IRQ_HANDLED;
  85}
  86
  87static void pc110pad_close(struct input_dev *dev)
  88{
  89        outb(PC110PAD_OFF, pc110pad_io + 2);
  90}
  91
  92static int pc110pad_open(struct input_dev *dev)
  93{
  94        pc110pad_interrupt(0, NULL);
  95        pc110pad_interrupt(0, NULL);
  96        pc110pad_interrupt(0, NULL);
  97        outb(PC110PAD_ON, pc110pad_io + 2);
  98        pc110pad_count = 0;
  99
 100        return 0;
 101}
 102
 103/*
 104 * We try to avoid enabling the hardware if it's not
 105 * there, but we don't know how to test. But we do know
 106 * that the PC110 is not a PCI system. So if we find any
 107 * PCI devices in the machine, we don't have a PC110.
 108 */
 109static int __init pc110pad_init(void)
 110{
 111        int err;
 112
 113        if (!no_pci_devices())
 114                return -ENODEV;
 115
 116        if (!request_region(pc110pad_io, 4, "pc110pad")) {
 117                printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
 118                                pc110pad_io, pc110pad_io + 4);
 119                return -EBUSY;
 120        }
 121
 122        outb(PC110PAD_OFF, pc110pad_io + 2);
 123
 124        if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
 125                printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 126                err = -EBUSY;
 127                goto err_release_region;
 128        }
 129
 130        pc110pad_dev = input_allocate_device();
 131        if (!pc110pad_dev) {
 132                printk(KERN_ERR "pc110pad: Not enough memory.\n");
 133                err = -ENOMEM;
 134                goto err_free_irq;
 135        }
 136
 137        pc110pad_dev->name = "IBM PC110 TouchPad";
 138        pc110pad_dev->phys = "isa15e0/input0";
 139        pc110pad_dev->id.bustype = BUS_ISA;
 140        pc110pad_dev->id.vendor = 0x0003;
 141        pc110pad_dev->id.product = 0x0001;
 142        pc110pad_dev->id.version = 0x0100;
 143
 144        pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 145        pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 146        pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 147
 148        pc110pad_dev->absmax[ABS_X] = 0x1ff;
 149        pc110pad_dev->absmax[ABS_Y] = 0x0ff;
 150
 151        pc110pad_dev->open = pc110pad_open;
 152        pc110pad_dev->close = pc110pad_close;
 153
 154        err = input_register_device(pc110pad_dev);
 155        if (err)
 156                goto err_free_dev;
 157
 158        return 0;
 159
 160 err_free_dev:
 161        input_free_device(pc110pad_dev);
 162 err_free_irq:
 163        free_irq(pc110pad_irq, NULL);
 164 err_release_region:
 165        release_region(pc110pad_io, 4);
 166
 167        return err;
 168}
 169
 170static void __exit pc110pad_exit(void)
 171{
 172        outb(PC110PAD_OFF, pc110pad_io + 2);
 173        free_irq(pc110pad_irq, NULL);
 174        input_unregister_device(pc110pad_dev);
 175        release_region(pc110pad_io, 4);
 176}
 177
 178module_init(pc110pad_init);
 179module_exit(pc110pad_exit);
 180