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 45MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 46MODULE_DESCRIPTION("IBM PC110 touchpad driver"); 47MODULE_LICENSE("GPL"); 48 49#define PC110PAD_OFF 0x30 50#define PC110PAD_ON 0x38 51 52static int pc110pad_irq = 10; 53static int pc110pad_io = 0x15e0; 54 55static struct input_dev *pc110pad_dev; 56static int pc110pad_data[3]; 57static int pc110pad_count; 58 59static 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 87static void pc110pad_close(struct input_dev *dev) 88{ 89 outb(PC110PAD_OFF, pc110pad_io + 2); 90} 91 92static 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 */ 109static 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 input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff); 149 input_abs_set_max(pc110pad_dev, 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 170static 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 178module_init(pc110pad_init); 179module_exit(pc110pad_exit); 180