/* * $Id: pc110pad.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $ * * Copyright (c) 2000-2001 Vojtech Pavlik * * Based on the work of: * Alan Cox Robin O'Leary */ /* * IBM PC110 touchpad driver for Linux */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/input.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/pci.h> #include <asm/io.h> #include <asm/irq.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("IBM PC110 touchpad driver"); MODULE_LICENSE("GPL"); #define PC110PAD_OFF 0x30 #define PC110PAD_ON 0x38 static int pc110pad_irq = 10; static int pc110pad_io = 0x15e0; static struct input_dev *pc110pad_dev; static int pc110pad_data[3]; static int pc110pad_count; static irqreturn_t pc110pad_interrupt(int irq, void *ptr, struct pt_regs *regs) { int value = inb_p(pc110pad_io); int handshake = inb_p(pc110pad_io + 2); outb_p(handshake | 1, pc110pad_io + 2); outb_p(handshake & ~1, pc110pad_io + 2); inb_p(0x64); pc110pad_data[pc110pad_count++] = value; if (pc110pad_count < 3) return IRQ_HANDLED; input_regs(pc110pad_dev, regs); input_report_key(pc110pad_dev, BTN_TOUCH, pc110pad_data[0] & 0x01); input_report_abs(pc110pad_dev, ABS_X, pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100)); input_report_abs(pc110pad_dev, ABS_Y, pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80)); input_sync(pc110pad_dev); pc110pad_count = 0; return IRQ_HANDLED; } static void pc110pad_close(struct input_dev *dev) { outb(PC110PAD_OFF, pc110pad_io + 2); } static int pc110pad_open(struct input_dev *dev) { pc110pad_interrupt(0, NULL, NULL); pc110pad_interrupt(0, NULL, NULL); pc110pad_interrupt(0, NULL, NULL); outb(PC110PAD_ON, pc110pad_io + 2); pc110pad_count = 0; return 0; } /* * We try to avoid enabling the hardware if it's not * there, but we don't know how to test. But we do know * that the PC110 is not a PCI system. So if we find any * PCI devices in the machine, we don't have a PC110. */ static int __init pc110pad_init(void) { struct pci_dev *dev; dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL); if (dev) { pci_dev_put(dev); return -ENOENT; } if (!request_region(pc110pad_io, 4, "pc110pad")) { printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n", pc110pad_io, pc110pad_io + 4); return -EBUSY; } outb(PC110PAD_OFF, pc110pad_io + 2); if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) { release_region(pc110pad_io, 4); printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq); return -EBUSY; } if (!(pc110pad_dev = input_allocate_device())) { free_irq(pc110pad_irq, NULL); release_region(pc110pad_io, 4); printk(KERN_ERR "pc110pad: Not enough memory.\n"); return -ENOMEM; } pc110pad_dev->name = "IBM PC110 TouchPad"; pc110pad_dev->phys = "isa15e0/input0"; pc110pad_dev->id.bustype = BUS_ISA; pc110pad_dev->id.vendor = 0x0003; pc110pad_dev->id.product = 0x0001; pc110pad_dev->id.version = 0x0100; pc110pad_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); pc110pad_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y); pc110pad_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); pc110pad_dev->absmax[ABS_X] = 0x1ff; pc110pad_dev->absmax[ABS_Y] = 0x0ff; pc110pad_dev->open = pc110pad_open; pc110pad_dev->close = pc110pad_close; input_register_device(pc110pad_dev); return 0; } static void __exit pc110pad_exit(void) { outb(PC110PAD_OFF, pc110pad_io + 2); free_irq(pc110pad_irq, NULL); input_unregister_device(pc110pad_dev); release_region(pc110pad_io, 4); } module_init(pc110pad_init); module_exit(pc110pad_exit);