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
  32 #include <linux/module.h>
  33 #include <linux/delay.h>
  34 #include <linux/ioport.h>
  35 #include <linux/init.h>
  36 #include <linux/input.h>
  37 #include <linux/interrupt.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41
  42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  43 MODULE_DESCRIPTION("Logitech busmouse driver");
  44 MODULE_LICENSE("GPL");
  45
  46 #define LOGIBM_BASE             0x23c
  47 #define LOGIBM_EXTENT           4
  48
  49 #define LOGIBM_DATA_PORT        LOGIBM_BASE + 0
  50 #define LOGIBM_SIGNATURE_PORT   LOGIBM_BASE + 1
  51 #define LOGIBM_CONTROL_PORT     LOGIBM_BASE + 2
  52 #define LOGIBM_CONFIG_PORT      LOGIBM_BASE + 3
  53
  54 #define LOGIBM_ENABLE_IRQ       0x00
  55 #define LOGIBM_DISABLE_IRQ      0x10
  56 #define LOGIBM_READ_X_LOW       0x80
  57 #define LOGIBM_READ_X_HIGH      0xa0
  58 #define LOGIBM_READ_Y_LOW       0xc0
  59 #define LOGIBM_READ_Y_HIGH      0xe0
  60
  61 #define LOGIBM_DEFAULT_MODE     0x90
  62 #define LOGIBM_CONFIG_BYTE      0x91
  63 #define LOGIBM_SIGNATURE_BYTE   0xa5
  64
  65 #define LOGIBM_IRQ              5
  66
  67 static int logibm_irq = LOGIBM_IRQ;
  68 module_param_hw_named(irq, logibm_irq, uint, irq, 0);
  69 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
  70
  71 static struct input_dev *logibm_dev;
  72
  73 static irqreturn_t logibm_interrupt(int irq, void *dev_id)
  74 {
  75         char dx, dy;
  76         unsigned char buttons;
  77
  78         outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
  79         dx = (inb(LOGIBM_DATA_PORT) & 0xf);
  80         outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
  81         dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
  82         outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
  83         dy = (inb(LOGIBM_DATA_PORT) & 0xf);
  84         outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
  85         buttons = inb(LOGIBM_DATA_PORT);
  86         dy |= (buttons & 0xf) << 4;
  87         buttons = ~buttons >> 5;
  88
  89         input_report_rel(logibm_dev, REL_X, dx);
  90         input_report_rel(logibm_dev, REL_Y, dy);
  91         input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
  92         input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
  93         input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
  94         input_sync(logibm_dev);
  95
  96         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
  97         return IRQ_HANDLED;
  98 }
  99
 100 static int logibm_open(struct input_dev *dev)
 101 {
 102         if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
 103                 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
 104                 return -EBUSY;
 105         }
 106         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
 107         return 0;
 108 }
 109
 110 static void logibm_close(struct input_dev *dev)
 111 {
 112         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 113         free_irq(logibm_irq, NULL);
 114 }
 115
 116 static int __init logibm_init(void)
 117 {
 118         int err;
 119
 120         if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
 121                 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
 122                 return -EBUSY;
 123         }
 124
 125         outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
 126         outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
 127         udelay(100);
 128
 129         if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
 130                 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
 131                 err = -ENODEV;
 132                 goto err_release_region;
 133         }
 134
 135         outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
 136         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 137
 138         logibm_dev = input_allocate_device();
 139         if (!logibm_dev) {
 140                 printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
 141                 err = -ENOMEM;
 142                 goto err_release_region;
 143         }
 144
 145         logibm_dev->name = "Logitech bus mouse";
 146         logibm_dev->phys = "isa023c/input0";
 147         logibm_dev->id.bustype = BUS_ISA;
 148         logibm_dev->id.vendor  = 0x0003;
 149         logibm_dev->id.product = 0x0001;
 150         logibm_dev->id.version = 0x0100;
 151
 152         logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 153         logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 154                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 155         logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 156
 157         logibm_dev->open  = logibm_open;
 158         logibm_dev->close = logibm_close;
 159
 160         err = input_register_device(logibm_dev);
 161         if (err)
 162                 goto err_free_dev;
 163
 164         return 0;
 165
 166  err_free_dev:
 167         input_free_device(logibm_dev);
 168  err_release_region:
 169         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 170
 171         return err;
 172 }
 173
 174 static void __exit logibm_exit(void)
 175 {
 176         input_unregister_device(logibm_dev);
 177         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 178 }
 179
 180 module_init(logibm_init);
 181 module_exit(logibm_exit);