drivers/input/mouse/logibm.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  *
   4  *  Based on the work of:
   5  *      James Banks             Matthew Dillon
   6  *      David Giller            Nathan Laredo
   7  *      Linus Torvalds          Johan Myreen
   8  *      Cliff Matthews          Philip Blundell
   9  *      Russell King
  10  */
  11
  12 /*
  13  * Logitech Bus Mouse Driver for Linux
  14  */
  15
  16 /*
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  30  *
  31  * Should you need to contact me, the author, you can do so either by
  32  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  33  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/delay.h>
  38 #include <linux/ioport.h>
  39 #include <linux/init.h>
  40 #include <linux/input.h>
  41 #include <linux/interrupt.h>
  42
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45
  46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  47 MODULE_DESCRIPTION("Logitech busmouse driver");
  48 MODULE_LICENSE("GPL");
  49
  50 #define LOGIBM_BASE             0x23c
  51 #define LOGIBM_EXTENT           4
  52
  53 #define LOGIBM_DATA_PORT        LOGIBM_BASE + 0
  54 #define LOGIBM_SIGNATURE_PORT   LOGIBM_BASE + 1
  55 #define LOGIBM_CONTROL_PORT     LOGIBM_BASE + 2
  56 #define LOGIBM_CONFIG_PORT      LOGIBM_BASE + 3
  57
  58 #define LOGIBM_ENABLE_IRQ       0x00
  59 #define LOGIBM_DISABLE_IRQ      0x10
  60 #define LOGIBM_READ_X_LOW       0x80
  61 #define LOGIBM_READ_X_HIGH      0xa0
  62 #define LOGIBM_READ_Y_LOW       0xc0
  63 #define LOGIBM_READ_Y_HIGH      0xe0
  64
  65 #define LOGIBM_DEFAULT_MODE     0x90
  66 #define LOGIBM_CONFIG_BYTE      0x91
  67 #define LOGIBM_SIGNATURE_BYTE   0xa5
  68
  69 #define LOGIBM_IRQ              5
  70
  71 static int logibm_irq = LOGIBM_IRQ;
  72 module_param_named(irq, logibm_irq, uint, 0);
  73 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
  74
  75 static struct input_dev *logibm_dev;
  76
  77 static irqreturn_t logibm_interrupt(int irq, void *dev_id)
  78 {
  79         char dx, dy;
  80         unsigned char buttons;
  81
  82         outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
  83         dx = (inb(LOGIBM_DATA_PORT) & 0xf);
  84         outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
  85         dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
  86         outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
  87         dy = (inb(LOGIBM_DATA_PORT) & 0xf);
  88         outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
  89         buttons = inb(LOGIBM_DATA_PORT);
  90         dy |= (buttons & 0xf) << 4;
  91         buttons = ~buttons >> 5;
  92
  93         input_report_rel(logibm_dev, REL_X, dx);
  94         input_report_rel(logibm_dev, REL_Y, dy);
  95         input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
  96         input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
  97         input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
  98         input_sync(logibm_dev);
  99
 100         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
 101         return IRQ_HANDLED;
 102 }
 103
 104 static int logibm_open(struct input_dev *dev)
 105 {
 106         if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
 107                 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
 108                 return -EBUSY;
 109         }
 110         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
 111         return 0;
 112 }
 113
 114 static void logibm_close(struct input_dev *dev)
 115 {
 116         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 117         free_irq(logibm_irq, NULL);
 118 }
 119
 120 static int __init logibm_init(void)
 121 {
 122         int err;
 123
 124         if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
 125                 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
 126                 return -EBUSY;
 127         }
 128
 129         outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
 130         outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
 131         udelay(100);
 132
 133         if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
 134                 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
 135                 err = -ENODEV;
 136                 goto err_release_region;
 137         }
 138
 139         outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
 140         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 141
 142         logibm_dev = input_allocate_device();
 143         if (!logibm_dev) {
 144                 printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
 145                 err = -ENOMEM;
 146                 goto err_release_region;
 147         }
 148
 149         logibm_dev->name = "Logitech bus mouse";
 150         logibm_dev->phys = "isa023c/input0";
 151         logibm_dev->id.bustype = BUS_ISA;
 152         logibm_dev->id.vendor  = 0x0003;
 153         logibm_dev->id.product = 0x0001;
 154         logibm_dev->id.version = 0x0100;
 155
 156         logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 157         logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 158                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 159         logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 160
 161         logibm_dev->open  = logibm_open;
 162         logibm_dev->close = logibm_close;
 163
 164         err = input_register_device(logibm_dev);
 165         if (err)
 166                 goto err_free_dev;
 167
 168         return 0;
 169
 170  err_free_dev:
 171         input_free_device(logibm_dev);
 172  err_release_region:
 173         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 174
 175         return err;
 176 }
 177
 178 static void __exit logibm_exit(void)
 179 {
 180         input_unregister_device(logibm_dev);
 181         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 182 }
 183
 184 module_init(logibm_init);
 185 module_exit(logibm_exit);