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
  42 #include <asm/io.h>
  43 #include <asm/irq.h>
  44
  45 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  46 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  47 MODULE_LICENSE("GPL");
  48
  49 #define PC110PAD_OFF    0x30
  50 #define PC110PAD_ON     0x38
  51
  52 static int pc110pad_irq = 10;
  53 static int pc110pad_io = 0x15e0;
  54
  55 static struct input_dev pc110pad_dev;
  56 static int pc110pad_data[3];
  57 static int pc110pad_count;
  58 static int pc110pad_used;
  59
  60 static char *pc110pad_name = "IBM PC110 TouchPad";
  61 static char *pc110pad_phys = "isa15e0/input0";
  62
  63 static irqreturn_t pc110pad_interrupt(int irq, void *ptr, struct pt_regs *regs)
  64 {
  65         int value     = inb_p(pc110pad_io);
  66         int handshake = inb_p(pc110pad_io + 2);
  67
  68         outb_p(handshake |  1, pc110pad_io + 2);
  69         outb_p(handshake & ~1, pc110pad_io + 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_regs(&pc110pad_dev, regs);
  78         input_report_key(&pc110pad_dev, BTN_TOUCH,
  79                 pc110pad_data[0] & 0x01);
  80         input_report_abs(&pc110pad_dev, ABS_X,
  81                 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  82         input_report_abs(&pc110pad_dev, ABS_Y,
  83                 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  84         input_sync(&pc110pad_dev);
  85
  86         pc110pad_count = 0;
  87         return IRQ_HANDLED;
  88 }
  89
  90 static void pc110pad_close(struct input_dev *dev)
  91 {
  92         if (!--pc110pad_used)
  93                 outb(PC110PAD_OFF, pc110pad_io + 2);
  94 }
  95
  96 static int pc110pad_open(struct input_dev *dev)
  97 {
  98         if (pc110pad_used++)
  99                 return 0;
 100
 101         pc110pad_interrupt(0,0,0);
 102         pc110pad_interrupt(0,0,0);
 103         pc110pad_interrupt(0,0,0);
 104         outb(PC110PAD_ON, pc110pad_io + 2);
 105         pc110pad_count = 0;
 106
 107         return 0;
 108 }
 109
 110 static int __init pc110pad_init(void)
 111 {
 112         if (request_region(pc110pad_io, 4, "pc110pad"))
 113         {
 114                 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n", 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", 0))
 121         {
 122                 release_region(pc110pad_io, 4);
 123                 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 124                 return -EBUSY;
 125         }
 126
 127         pc110pad_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 128         pc110pad_dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 129         pc110pad_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 130
 131         pc110pad_dev.absmax[ABS_X] = 0x1ff;
 132         pc110pad_dev.absmax[ABS_Y] = 0x0ff;
 133
 134         pc110pad_dev.open = pc110pad_open;
 135         pc110pad_dev.close = pc110pad_close;
 136
 137         pc110pad_dev.name = pc110pad_name;
 138         pc110pad_dev.phys = pc110pad_phys;
 139         pc110pad_dev.id.bustype = BUS_ISA;
 140         pc110pad_dev.id.vendor = 0x0003;
 141         pc110pad_dev.id.product = 0x0001;
 142         pc110pad_dev.id.version = 0x0100;
 143
 144         input_register_device(&pc110pad_dev);
 145
 146         printk(KERN_INFO "input: %s at %#x irq %d\n",
 147                 pc110pad_name, pc110pad_io, pc110pad_irq);
 148
 149         return 0;
 150 }
 151
 152 static void __exit pc110pad_exit(void)
 153 {
 154         input_unregister_device(&pc110pad_dev);
 155
 156         outb(PC110PAD_OFF, pc110pad_io + 2);
 157
 158         free_irq(pc110pad_irq, 0);
 159         release_region(pc110pad_io, 4);
 160 }
 161
 162 module_init(pc110pad_init);
 163 module_exit(pc110pad_exit);