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