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
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45
  46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  47 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define PC110PAD_OFF    0x30
  51 #define PC110PAD_ON     0x38
  52
  53 static int pc110pad_irq = 10;
  54 static int pc110pad_io = 0x15e0;
  55
  56 static struct input_dev pc110pad_dev;
  57 static int pc110pad_data[3];
  58 static int pc110pad_count;
  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         outb(PC110PAD_OFF, pc110pad_io + 2);
  93 }
  94
  95 static int pc110pad_open(struct input_dev *dev)
  96 {
  97         pc110pad_interrupt(0,NULL,NULL);
  98         pc110pad_interrupt(0,NULL,NULL);
  99         pc110pad_interrupt(0,NULL,NULL);
 100         outb(PC110PAD_ON, pc110pad_io + 2);
 101         pc110pad_count = 0;
 102
 103         return 0;
 104 }
 105
 106 /*
 107  * We try to avoid enabling the hardware if it's not
 108  * there, but we don't know how to test. But we do know
 109  * that the PC110 is not a PCI system. So if we find any
 110  * PCI devices in the machine, we don't have a PC110.
 111  */
 112 static int __init pc110pad_init(void)
 113 {
 114         struct pci_dev *dev;
 115
 116         dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
 117         if (dev) {
 118                 pci_dev_put(dev);
 119                 return -ENOENT;
 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         {
 132                 release_region(pc110pad_io, 4);
 133                 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 134                 return -EBUSY;
 135         }
 136
 137         pc110pad_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 138         pc110pad_dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 139         pc110pad_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 140
 141         pc110pad_dev.absmax[ABS_X] = 0x1ff;
 142         pc110pad_dev.absmax[ABS_Y] = 0x0ff;
 143
 144         pc110pad_dev.open = pc110pad_open;
 145         pc110pad_dev.close = pc110pad_close;
 146
 147         pc110pad_dev.name = pc110pad_name;
 148         pc110pad_dev.phys = pc110pad_phys;
 149         pc110pad_dev.id.bustype = BUS_ISA;
 150         pc110pad_dev.id.vendor = 0x0003;
 151         pc110pad_dev.id.product = 0x0001;
 152         pc110pad_dev.id.version = 0x0100;
 153
 154         input_register_device(&pc110pad_dev);
 155
 156         printk(KERN_INFO "input: %s at %#x irq %d\n",
 157                 pc110pad_name, pc110pad_io, pc110pad_irq);
 158
 159         return 0;
 160 }
 161
 162 static void __exit pc110pad_exit(void)
 163 {
 164         input_unregister_device(&pc110pad_dev);
 165
 166         outb(PC110PAD_OFF, pc110pad_io + 2);
 167
 168         free_irq(pc110pad_irq, NULL);
 169         release_region(pc110pad_io, 4);
 170 }
 171
 172 module_init(pc110pad_init);
 173 module_exit(pc110pad_exit);