drivers/input/mouse/pc110pad.c

   1 /*
   2  * $Id: pc110pad.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
   3  *
   4  *  Copyright (c) 2000-2001 Vojtech Pavlik
   5  *
   6  *  Based on the work of:
   7  *      Alan Cox        Robin O'Leary
   8  */
   9
  10 /*
  11  * IBM PC110 touchpad driver for Linux
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  * Should you need to contact me, the author, you can do so either by
  30  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  31  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/kernel.h>
  36 #include <linux/errno.h>
  37 #include <linux/ioport.h>
  38 #include <linux/input.h>
  39 #include <linux/init.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/pci.h>
  42 #include <linux/delay.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46
  47 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  48 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  49 MODULE_LICENSE("GPL");
  50
  51 #define PC110PAD_OFF    0x30
  52 #define PC110PAD_ON     0x38
  53
  54 static int pc110pad_irq = 10;
  55 static int pc110pad_io = 0x15e0;
  56
  57 static struct input_dev *pc110pad_dev;
  58 static int pc110pad_data[3];
  59 static int pc110pad_count;
  60
  61 static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
  62 {
  63         int value     = inb_p(pc110pad_io);
  64         int handshake = inb_p(pc110pad_io + 2);
  65
  66         outb(handshake |  1, pc110pad_io + 2);
  67         udelay(2);
  68         outb(handshake & ~1, pc110pad_io + 2);
  69         udelay(2);
  70         inb_p(0x64);
  71
  72         pc110pad_data[pc110pad_count++] = value;
  73
  74         if (pc110pad_count < 3)
  75                 return IRQ_HANDLED;
  76
  77         input_report_key(pc110pad_dev, BTN_TOUCH,
  78                 pc110pad_data[0] & 0x01);
  79         input_report_abs(pc110pad_dev, ABS_X,
  80                 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  81         input_report_abs(pc110pad_dev, ABS_Y,
  82                 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  83         input_sync(pc110pad_dev);
  84
  85         pc110pad_count = 0;
  86         return IRQ_HANDLED;
  87 }
  88
  89 static void pc110pad_close(struct input_dev *dev)
  90 {
  91         outb(PC110PAD_OFF, pc110pad_io + 2);
  92 }
  93
  94 static int pc110pad_open(struct input_dev *dev)
  95 {
  96         pc110pad_interrupt(0, NULL);
  97         pc110pad_interrupt(0, NULL);
  98         pc110pad_interrupt(0, NULL);
  99         outb(PC110PAD_ON, pc110pad_io + 2);
 100         pc110pad_count = 0;
 101
 102         return 0;
 103 }
 104
 105 /*
 106  * We try to avoid enabling the hardware if it's not
 107  * there, but we don't know how to test. But we do know
 108  * that the PC110 is not a PCI system. So if we find any
 109  * PCI devices in the machine, we don't have a PC110.
 110  */
 111 static int __init pc110pad_init(void)
 112 {
 113         struct pci_dev *dev;
 114         int err;
 115
 116         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
 117         if (dev) {
 118                 pci_dev_put(dev);
 119                 return -ENODEV;
 120         }
 121
 122         if (!request_region(pc110pad_io, 4, "pc110pad")) {
 123                 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
 124                                 pc110pad_io, pc110pad_io + 4);
 125                 return -EBUSY;
 126         }
 127
 128         outb(PC110PAD_OFF, pc110pad_io + 2);
 129
 130         if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
 131                 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 132                 err = -EBUSY;
 133                 goto err_release_region;
 134         }
 135
 136         pc110pad_dev = input_allocate_device();
 137         if (!pc110pad_dev) {
 138                 printk(KERN_ERR "pc110pad: Not enough memory.\n");
 139                 err = -ENOMEM;
 140                 goto err_free_irq;
 141         }
 142
 143         pc110pad_dev->name = "IBM PC110 TouchPad";
 144         pc110pad_dev->phys = "isa15e0/input0";
 145         pc110pad_dev->id.bustype = BUS_ISA;
 146         pc110pad_dev->id.vendor = 0x0003;
 147         pc110pad_dev->id.product = 0x0001;
 148         pc110pad_dev->id.version = 0x0100;
 149
 150         pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 151         pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 152         pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 153
 154         pc110pad_dev->absmax[ABS_X] = 0x1ff;
 155         pc110pad_dev->absmax[ABS_Y] = 0x0ff;
 156
 157         pc110pad_dev->open = pc110pad_open;
 158         pc110pad_dev->close = pc110pad_close;
 159
 160         err = input_register_device(pc110pad_dev);
 161         if (err)
 162                 goto err_free_dev;
 163
 164         return 0;
 165
 166  err_free_dev:
 167         input_free_device(pc110pad_dev);
 168  err_free_irq:
 169         free_irq(pc110pad_irq, NULL);
 170  err_release_region:
 171         release_region(pc110pad_io, 4);
 172
 173         return err;
 174 }
 175
 176 static void __exit pc110pad_exit(void)
 177 {
 178         outb(PC110PAD_OFF, pc110pad_io + 2);
 179         free_irq(pc110pad_irq, NULL);
 180         input_unregister_device(pc110pad_dev);
 181         release_region(pc110pad_io, 4);
 182 }
 183
 184 module_init(pc110pad_init);
 185 module_exit(pc110pad_exit);