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
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/errno.h>
  31 #include <linux/ioport.h>
  32 #include <linux/input.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/pci.h>
  36 #include <linux/delay.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40
  41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  42 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  43 MODULE_LICENSE("GPL");
  44
  45 #define PC110PAD_OFF    0x30
  46 #define PC110PAD_ON     0x38
  47
  48 static int pc110pad_irq = 10;
  49 static int pc110pad_io = 0x15e0;
  50
  51 static struct input_dev *pc110pad_dev;
  52 static int pc110pad_data[3];
  53 static int pc110pad_count;
  54
  55 static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
  56 {
  57         int value     = inb_p(pc110pad_io);
  58         int handshake = inb_p(pc110pad_io + 2);
  59
  60         outb(handshake |  1, pc110pad_io + 2);
  61         udelay(2);
  62         outb(handshake & ~1, pc110pad_io + 2);
  63         udelay(2);
  64         inb_p(0x64);
  65
  66         pc110pad_data[pc110pad_count++] = value;
  67
  68         if (pc110pad_count < 3)
  69                 return IRQ_HANDLED;
  70
  71         input_report_key(pc110pad_dev, BTN_TOUCH,
  72                 pc110pad_data[0] & 0x01);
  73         input_report_abs(pc110pad_dev, ABS_X,
  74                 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  75         input_report_abs(pc110pad_dev, ABS_Y,
  76                 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  77         input_sync(pc110pad_dev);
  78
  79         pc110pad_count = 0;
  80         return IRQ_HANDLED;
  81 }
  82
  83 static void pc110pad_close(struct input_dev *dev)
  84 {
  85         outb(PC110PAD_OFF, pc110pad_io + 2);
  86 }
  87
  88 static int pc110pad_open(struct input_dev *dev)
  89 {
  90         pc110pad_interrupt(0, NULL);
  91         pc110pad_interrupt(0, NULL);
  92         pc110pad_interrupt(0, NULL);
  93         outb(PC110PAD_ON, pc110pad_io + 2);
  94         pc110pad_count = 0;
  95
  96         return 0;
  97 }
  98
  99 /*
 100  * We try to avoid enabling the hardware if it's not
 101  * there, but we don't know how to test. But we do know
 102  * that the PC110 is not a PCI system. So if we find any
 103  * PCI devices in the machine, we don't have a PC110.
 104  */
 105 static int __init pc110pad_init(void)
 106 {
 107         int err;
 108
 109         if (!no_pci_devices())
 110                 return -ENODEV;
 111
 112         if (!request_region(pc110pad_io, 4, "pc110pad")) {
 113                 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
 114                                 pc110pad_io, pc110pad_io + 4);
 115                 return -EBUSY;
 116         }
 117
 118         outb(PC110PAD_OFF, pc110pad_io + 2);
 119
 120         if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
 121                 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 122                 err = -EBUSY;
 123                 goto err_release_region;
 124         }
 125
 126         pc110pad_dev = input_allocate_device();
 127         if (!pc110pad_dev) {
 128                 printk(KERN_ERR "pc110pad: Not enough memory.\n");
 129                 err = -ENOMEM;
 130                 goto err_free_irq;
 131         }
 132
 133         pc110pad_dev->name = "IBM PC110 TouchPad";
 134         pc110pad_dev->phys = "isa15e0/input0";
 135         pc110pad_dev->id.bustype = BUS_ISA;
 136         pc110pad_dev->id.vendor = 0x0003;
 137         pc110pad_dev->id.product = 0x0001;
 138         pc110pad_dev->id.version = 0x0100;
 139
 140         pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 141         pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 142         pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 143
 144         input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
 145         input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
 146
 147         pc110pad_dev->open = pc110pad_open;
 148         pc110pad_dev->close = pc110pad_close;
 149
 150         err = input_register_device(pc110pad_dev);
 151         if (err)
 152                 goto err_free_dev;
 153
 154         return 0;
 155
 156  err_free_dev:
 157         input_free_device(pc110pad_dev);
 158  err_free_irq:
 159         free_irq(pc110pad_irq, NULL);
 160  err_release_region:
 161         release_region(pc110pad_io, 4);
 162
 163         return err;
 164 }
 165
 166 static void __exit pc110pad_exit(void)
 167 {
 168         outb(PC110PAD_OFF, pc110pad_io + 2);
 169         free_irq(pc110pad_irq, NULL);
 170         input_unregister_device(pc110pad_dev);
 171         release_region(pc110pad_io, 4);
 172 }
 173
 174 module_init(pc110pad_init);
 175 module_exit(pc110pad_exit);