2 * $Id: pc110pad.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
4 * Copyright (c) 2000-2001 Vojtech Pavlik
6 * Based on the work of:
7 * Alan Cox Robin O'Leary
11 * IBM PC110 touchpad driver for Linux
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.
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.
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
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
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>
46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
47 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
48 MODULE_LICENSE("GPL");
50 #define PC110PAD_OFF 0x30
51 #define PC110PAD_ON 0x38
53 static int pc110pad_irq = 10;
54 static int pc110pad_io = 0x15e0;
56 static struct input_dev *pc110pad_dev;
57 static int pc110pad_data[3];
58 static int pc110pad_count;
60 static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
62 int value = inb_p(pc110pad_io);
63 int handshake = inb_p(pc110pad_io + 2);
65 outb_p(handshake | 1, pc110pad_io + 2);
66 outb_p(handshake & ~1, pc110pad_io + 2);
69 pc110pad_data[pc110pad_count++] = value;
71 if (pc110pad_count < 3)
74 input_report_key(pc110pad_dev, BTN_TOUCH,
75 pc110pad_data[0] & 0x01);
76 input_report_abs(pc110pad_dev, ABS_X,
77 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
78 input_report_abs(pc110pad_dev, ABS_Y,
79 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
80 input_sync(pc110pad_dev);
86 static void pc110pad_close(struct input_dev *dev)
88 outb(PC110PAD_OFF, pc110pad_io + 2);
91 static int pc110pad_open(struct input_dev *dev)
93 pc110pad_interrupt(0, NULL);
94 pc110pad_interrupt(0, NULL);
95 pc110pad_interrupt(0, NULL);
96 outb(PC110PAD_ON, pc110pad_io + 2);
103 * We try to avoid enabling the hardware if it's not
104 * there, but we don't know how to test. But we do know
105 * that the PC110 is not a PCI system. So if we find any
106 * PCI devices in the machine, we don't have a PC110.
108 static int __init pc110pad_init(void)
113 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
119 if (!request_region(pc110pad_io, 4, "pc110pad")) {
120 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
121 pc110pad_io, pc110pad_io + 4);
125 outb(PC110PAD_OFF, pc110pad_io + 2);
127 if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
128 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
130 goto err_release_region;
133 pc110pad_dev = input_allocate_device();
135 printk(KERN_ERR "pc110pad: Not enough memory.\n");
140 pc110pad_dev->name = "IBM PC110 TouchPad";
141 pc110pad_dev->phys = "isa15e0/input0";
142 pc110pad_dev->id.bustype = BUS_ISA;
143 pc110pad_dev->id.vendor = 0x0003;
144 pc110pad_dev->id.product = 0x0001;
145 pc110pad_dev->id.version = 0x0100;
147 pc110pad_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
148 pc110pad_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
149 pc110pad_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
151 pc110pad_dev->absmax[ABS_X] = 0x1ff;
152 pc110pad_dev->absmax[ABS_Y] = 0x0ff;
154 pc110pad_dev->open = pc110pad_open;
155 pc110pad_dev->close = pc110pad_close;
157 err = input_register_device(pc110pad_dev);
164 input_free_device(pc110pad_dev);
166 free_irq(pc110pad_irq, NULL);
168 release_region(pc110pad_io, 4);
173 static void __exit pc110pad_exit(void)
175 outb(PC110PAD_OFF, pc110pad_io + 2);
176 free_irq(pc110pad_irq, NULL);
177 input_unregister_device(pc110pad_dev);
178 release_region(pc110pad_io, 4);
181 module_init(pc110pad_init);
182 module_exit(pc110pad_exit);