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
  29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  30 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  31 MODULE_LICENSE("GPL");
  32
  33 #define PC110PAD_OFF    0x30
  34 #define PC110PAD_ON     0x38
  35
  36 static int pc110pad_irq = 10;
  37 static int pc110pad_io = 0x15e0;
  38
  39 static struct input_dev *pc110pad_dev;
  40 static int pc110pad_data[3];
  41 static int pc110pad_count;
  42
  43 static 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
  71 static void pc110pad_close(struct input_dev *dev)
  72 {
  73         outb(PC110PAD_OFF, pc110pad_io + 2);
  74 }
  75
  76 static 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  */
  93 static 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
 154 static 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
 162 module_init(pc110pad_init);
 163 module_exit(pc110pad_exit);