drivers/input/mouse/logibm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1999-2001 Vojtech Pavlik
   4  *
   5  *  Based on the work of:
   6  *      James Banks             Matthew Dillon
   7  *      David Giller            Nathan Laredo
   8  *      Linus Torvalds          Johan Myreen
   9  *      Cliff Matthews          Philip Blundell
  10  *      Russell King
  11  */
  12
  13 /*
  14  * Logitech Bus Mouse Driver for Linux
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/delay.h>
  19 #include <linux/ioport.h>
  20 #include <linux/init.h>
  21 #include <linux/input.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/irq.h>
  26
  27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  28 MODULE_DESCRIPTION("Logitech busmouse driver");
  29 MODULE_LICENSE("GPL");
  30
  31 #define LOGIBM_BASE             0x23c
  32 #define LOGIBM_EXTENT           4
  33
  34 #define LOGIBM_DATA_PORT        LOGIBM_BASE + 0
  35 #define LOGIBM_SIGNATURE_PORT   LOGIBM_BASE + 1
  36 #define LOGIBM_CONTROL_PORT     LOGIBM_BASE + 2
  37 #define LOGIBM_CONFIG_PORT      LOGIBM_BASE + 3
  38
  39 #define LOGIBM_ENABLE_IRQ       0x00
  40 #define LOGIBM_DISABLE_IRQ      0x10
  41 #define LOGIBM_READ_X_LOW       0x80
  42 #define LOGIBM_READ_X_HIGH      0xa0
  43 #define LOGIBM_READ_Y_LOW       0xc0
  44 #define LOGIBM_READ_Y_HIGH      0xe0
  45
  46 #define LOGIBM_DEFAULT_MODE     0x90
  47 #define LOGIBM_CONFIG_BYTE      0x91
  48 #define LOGIBM_SIGNATURE_BYTE   0xa5
  49
  50 #define LOGIBM_IRQ              5
  51
  52 static int logibm_irq = LOGIBM_IRQ;
  53 module_param_hw_named(irq, logibm_irq, uint, irq, 0);
  54 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
  55
  56 static struct input_dev *logibm_dev;
  57
  58 static irqreturn_t logibm_interrupt(int irq, void *dev_id)
  59 {
  60         char dx, dy;
  61         unsigned char buttons;
  62
  63         outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
  64         dx = (inb(LOGIBM_DATA_PORT) & 0xf);
  65         outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
  66         dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
  67         outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
  68         dy = (inb(LOGIBM_DATA_PORT) & 0xf);
  69         outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
  70         buttons = inb(LOGIBM_DATA_PORT);
  71         dy |= (buttons & 0xf) << 4;
  72         buttons = ~buttons >> 5;
  73
  74         input_report_rel(logibm_dev, REL_X, dx);
  75         input_report_rel(logibm_dev, REL_Y, dy);
  76         input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
  77         input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
  78         input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
  79         input_sync(logibm_dev);
  80
  81         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
  82         return IRQ_HANDLED;
  83 }
  84
  85 static int logibm_open(struct input_dev *dev)
  86 {
  87         if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
  88                 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
  89                 return -EBUSY;
  90         }
  91         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
  92         return 0;
  93 }
  94
  95 static void logibm_close(struct input_dev *dev)
  96 {
  97         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
  98         free_irq(logibm_irq, NULL);
  99 }
 100
 101 static int __init logibm_init(void)
 102 {
 103         int err;
 104
 105         if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
 106                 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
 107                 return -EBUSY;
 108         }
 109
 110         outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
 111         outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
 112         udelay(100);
 113
 114         if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
 115                 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
 116                 err = -ENODEV;
 117                 goto err_release_region;
 118         }
 119
 120         outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
 121         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 122
 123         logibm_dev = input_allocate_device();
 124         if (!logibm_dev) {
 125                 printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
 126                 err = -ENOMEM;
 127                 goto err_release_region;
 128         }
 129
 130         logibm_dev->name = "Logitech bus mouse";
 131         logibm_dev->phys = "isa023c/input0";
 132         logibm_dev->id.bustype = BUS_ISA;
 133         logibm_dev->id.vendor  = 0x0003;
 134         logibm_dev->id.product = 0x0001;
 135         logibm_dev->id.version = 0x0100;
 136
 137         logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 138         logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
 139                 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
 140         logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 141
 142         logibm_dev->open  = logibm_open;
 143         logibm_dev->close = logibm_close;
 144
 145         err = input_register_device(logibm_dev);
 146         if (err)
 147                 goto err_free_dev;
 148
 149         return 0;
 150
 151  err_free_dev:
 152         input_free_device(logibm_dev);
 153  err_release_region:
 154         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 155
 156         return err;
 157 }
 158
 159 static void __exit logibm_exit(void)
 160 {
 161         input_unregister_device(logibm_dev);
 162         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 163 }
 164
 165 module_init(logibm_init);
 166 module_exit(logibm_exit);