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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Copyright (c) 2000-2001 Vojtech Pavlik
   4 *
   5 *  Based on the work of:
   6 *      Alan Cox        Robin O'Leary
   7 */
   8
   9/*
  10 * IBM PC110 touchpad driver for Linux
  11 */
  12
  13/*
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/kernel.h>
  18#include <linux/errno.h>
  19#include <linux/ioport.h>
  20#include <linux/input.h>
  21#include <linux/init.h>
  22#include <linux/interrupt.h>
  23#include <linux/pci.h>
  24#include <linux/delay.h>
  25
  26#include <asm/io.h>
  27#include <asm/irq.h>
  28
  29MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  30MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  31MODULE_LICENSE("GPL");
  32
  33#define PC110PAD_OFF    0x30
  34#define PC110PAD_ON     0x38
  35
  36static int pc110pad_irq = 10;
  37static int pc110pad_io = 0x15e0;
  38
  39static struct input_dev *pc110pad_dev;
  40static int pc110pad_data[3];
  41static int pc110pad_count;
  42
  43static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
  44{
  45        int value     = inb_p(pc110pad_io);
  46        int handshake = inb_p(pc110pad_io + 2);
  47
  48        outb(handshake |  1, pc110pad_io + 2);
  49        udelay(2);
  50        outb(handshake & ~1, pc110pad_io + 2);
  51        udelay(2);
  52        inb_p(0x64);
  53
  54        pc110pad_data[pc110pad_count++] = value;
  55
  56        if (pc110pad_count < 3)
  57                return IRQ_HANDLED;
  58
  59        input_report_key(pc110pad_dev, BTN_TOUCH,
  60                pc110pad_data[0] & 0x01);
  61        input_report_abs(pc110pad_dev, ABS_X,
  62                pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  63        input_report_abs(pc110pad_dev, ABS_Y,
  64                pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  65        input_sync(pc110pad_dev);
  66
  67        pc110pad_count = 0;
  68        return IRQ_HANDLED;
  69}
  70
  71static void pc110pad_close(struct input_dev *dev)
  72{
  73        outb(PC110PAD_OFF, pc110pad_io + 2);
  74}
  75
  76static int pc110pad_open(struct input_dev *dev)
  77{
  78        pc110pad_interrupt(0, NULL);
  79        pc110pad_interrupt(0, NULL);
  80        pc110pad_interrupt(0, NULL);
  81        outb(PC110PAD_ON, pc110pad_io + 2);
  82        pc110pad_count = 0;
  83
  84        return 0;
  85}
  86
  87/*
  88 * We try to avoid enabling the hardware if it's not
  89 * there, but we don't know how to test. But we do know
  90 * that the PC110 is not a PCI system. So if we find any
  91 * PCI devices in the machine, we don't have a PC110.
  92 */
  93static int __init pc110pad_init(void)
  94{
  95        int err;
  96
  97        if (!no_pci_devices())
  98                return -ENODEV;
  99
 100        if (!request_region(pc110pad_io, 4, "pc110pad")) {
 101                printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
 102                                pc110pad_io, pc110pad_io + 4);
 103                return -EBUSY;
 104        }
 105
 106        outb(PC110PAD_OFF, pc110pad_io + 2);
 107
 108        if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
 109                printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 110                err = -EBUSY;
 111                goto err_release_region;
 112        }
 113
 114        pc110pad_dev = input_allocate_device();
 115        if (!pc110pad_dev) {
 116                printk(KERN_ERR "pc110pad: Not enough memory.\n");
 117                err = -ENOMEM;
 118                goto err_free_irq;
 119        }
 120
 121        pc110pad_dev->name = "IBM PC110 TouchPad";
 122        pc110pad_dev->phys = "isa15e0/input0";
 123        pc110pad_dev->id.bustype = BUS_ISA;
 124        pc110pad_dev->id.vendor = 0x0003;
 125        pc110pad_dev->id.product = 0x0001;
 126        pc110pad_dev->id.version = 0x0100;
 127
 128        pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 129        pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 130        pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 131
 132        input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
 133        input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
 134
 135        pc110pad_dev->open = pc110pad_open;
 136        pc110pad_dev->close = pc110pad_close;
 137
 138        err = input_register_device(pc110pad_dev);
 139        if (err)
 140                goto err_free_dev;
 141
 142        return 0;
 143
 144 err_free_dev:
 145        input_free_device(pc110pad_dev);
 146 err_free_irq:
 147        free_irq(pc110pad_irq, NULL);
 148 err_release_region:
 149        release_region(pc110pad_io, 4);
 150
 151        return err;
 152}
 153
 154static void __exit pc110pad_exit(void)
 155{
 156        outb(PC110PAD_OFF, pc110pad_io + 2);
 157        free_irq(pc110pad_irq, NULL);
 158        input_unregister_device(pc110pad_dev);
 159        release_region(pc110pad_io, 4);
 160}
 161
 162module_init(pc110pad_init);
 163module_exit(pc110pad_exit);
 164