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  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/kernel.h>
  34 #include <linux/errno.h>
  35 #include <linux/ioport.h>
  36 #include <linux/input.h>
  37 #include <linux/init.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/pci.h>
  40 #include <linux/delay.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
  59 static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
  60 {
  61         int value     = inb_p(pc110pad_io);
  62         int handshake = inb_p(pc110pad_io + 2);
  63
  64         outb(handshake |  1, pc110pad_io + 2);
  65         udelay(2);
  66         outb(handshake & ~1, pc110pad_io + 2);
  67         udelay(2);
  68         inb_p(0x64);
  69
  70         pc110pad_data[pc110pad_count++] = value;
  71
  72         if (pc110pad_count < 3)
  73                 return IRQ_HANDLED;
  74
  75         input_report_key(pc110pad_dev, BTN_TOUCH,
  76                 pc110pad_data[0] & 0x01);
  77         input_report_abs(pc110pad_dev, ABS_X,
  78                 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
  79         input_report_abs(pc110pad_dev, ABS_Y,
  80                 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
  81         input_sync(pc110pad_dev);
  82
  83         pc110pad_count = 0;
  84         return IRQ_HANDLED;
  85 }
  86
  87 static void pc110pad_close(struct input_dev *dev)
  88 {
  89         outb(PC110PAD_OFF, pc110pad_io + 2);
  90 }
  91
  92 static int pc110pad_open(struct input_dev *dev)
  93 {
  94         pc110pad_interrupt(0, NULL);
  95         pc110pad_interrupt(0, NULL);
  96         pc110pad_interrupt(0, NULL);
  97         outb(PC110PAD_ON, pc110pad_io + 2);
  98         pc110pad_count = 0;
  99
 100         return 0;
 101 }
 102
 103 /*
 104  * We try to avoid enabling the hardware if it's not
 105  * there, but we don't know how to test. But we do know
 106  * that the PC110 is not a PCI system. So if we find any
 107  * PCI devices in the machine, we don't have a PC110.
 108  */
 109 static int __init pc110pad_init(void)
 110 {
 111         int err;
 112
 113         if (!no_pci_devices())
 114                 return -ENODEV;
 115
 116         if (!request_region(pc110pad_io, 4, "pc110pad")) {
 117                 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
 118                                 pc110pad_io, pc110pad_io + 4);
 119                 return -EBUSY;
 120         }
 121
 122         outb(PC110PAD_OFF, pc110pad_io + 2);
 123
 124         if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
 125                 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
 126                 err = -EBUSY;
 127                 goto err_release_region;
 128         }
 129
 130         pc110pad_dev = input_allocate_device();
 131         if (!pc110pad_dev) {
 132                 printk(KERN_ERR "pc110pad: Not enough memory.\n");
 133                 err = -ENOMEM;
 134                 goto err_free_irq;
 135         }
 136
 137         pc110pad_dev->name = "IBM PC110 TouchPad";
 138         pc110pad_dev->phys = "isa15e0/input0";
 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         pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 145         pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
 146         pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 147
 148         pc110pad_dev->absmax[ABS_X] = 0x1ff;
 149         pc110pad_dev->absmax[ABS_Y] = 0x0ff;
 150
 151         pc110pad_dev->open = pc110pad_open;
 152         pc110pad_dev->close = pc110pad_close;
 153
 154         err = input_register_device(pc110pad_dev);
 155         if (err)
 156                 goto err_free_dev;
 157
 158         return 0;
 159
 160  err_free_dev:
 161         input_free_device(pc110pad_dev);
 162  err_free_irq:
 163         free_irq(pc110pad_irq, NULL);
 164  err_release_region:
 165         release_region(pc110pad_io, 4);
 166
 167         return err;
 168 }
 169
 170 static void __exit pc110pad_exit(void)
 171 {
 172         outb(PC110PAD_OFF, pc110pad_io + 2);
 173         free_irq(pc110pad_irq, NULL);
 174         input_unregister_device(pc110pad_dev);
 175         release_region(pc110pad_io, 4);
 176 }
 177
 178 module_init(pc110pad_init);
 179 module_exit(pc110pad_exit);