drivers/input/mouse/logibm.c

   1 /*
   2  * $Id: logibm.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2001 Vojtech Pavlik
   5  *
   6  *  Based on the work of:
   7  *      James Banks             Matthew Dillon
   8  *      David Giller            Nathan Laredo
   9  *      Linus Torvalds          Johan Myreen
  10  *      Cliff Matthews          Philip Blundell
  11  *      Russell King
  12  */
  13
  14 /*
  15  * Logitech Bus Mouse Driver for Linux
  16  */
  17
  18 /*
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  32  *
  33  * Should you need to contact me, the author, you can do so either by
  34  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  35  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/delay.h>
  41 #include <linux/ioport.h>
  42 #include <linux/init.h>
  43 #include <linux/input.h>
  44 #include <linux/interrupt.h>
  45
  46 #include <asm/io.h>
  47 #include <asm/irq.h>
  48
  49 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  50 MODULE_DESCRIPTION("Logitech busmouse driver");
  51 MODULE_LICENSE("GPL");
  52
  53 #define LOGIBM_BASE             0x23c
  54 #define LOGIBM_EXTENT           4
  55
  56 #define LOGIBM_DATA_PORT        LOGIBM_BASE + 0
  57 #define LOGIBM_SIGNATURE_PORT   LOGIBM_BASE + 1
  58 #define LOGIBM_CONTROL_PORT     LOGIBM_BASE + 2
  59 #define LOGIBM_CONFIG_PORT      LOGIBM_BASE + 3
  60
  61 #define LOGIBM_ENABLE_IRQ       0x00
  62 #define LOGIBM_DISABLE_IRQ      0x10
  63 #define LOGIBM_READ_X_LOW       0x80
  64 #define LOGIBM_READ_X_HIGH      0xa0
  65 #define LOGIBM_READ_Y_LOW       0xc0
  66 #define LOGIBM_READ_Y_HIGH      0xe0
  67
  68 #define LOGIBM_DEFAULT_MODE     0x90
  69 #define LOGIBM_CONFIG_BYTE      0x91
  70 #define LOGIBM_SIGNATURE_BYTE   0xa5
  71
  72 #define LOGIBM_IRQ              5
  73
  74 static int logibm_irq = LOGIBM_IRQ;
  75 module_param_named(irq, logibm_irq, uint, 0);
  76 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
  77
  78 __obsolete_setup("logibm_irq=");
  79
  80 static int logibm_used = 0;
  81
  82 static irqreturn_t logibm_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  83
  84 static int logibm_open(struct input_dev *dev)
  85 {
  86         if (logibm_used++)
  87                 return 0;
  88         if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
  89                 logibm_used--;
  90                 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
  91                 return -EBUSY;
  92         }
  93         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
  94         return 0;
  95 }
  96
  97 static void logibm_close(struct input_dev *dev)
  98 {
  99         if (--logibm_used)
 100                 return;
 101         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 102         free_irq(logibm_irq, NULL);
 103 }
 104
 105 static struct input_dev logibm_dev = {
 106         .evbit  = { BIT(EV_KEY) | BIT(EV_REL) },
 107         .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT) },
 108         .relbit = { BIT(REL_X) | BIT(REL_Y) },
 109         .open   = logibm_open,
 110         .close  = logibm_close,
 111         .name   = "Logitech bus mouse",
 112         .phys   = "isa023c/input0",
 113         .id     = {
 114                 .bustype = BUS_ISA,
 115                 .vendor  = 0x0003,
 116                 .product = 0x0001,
 117                 .version = 0x0100,
 118         },
 119 };
 120
 121 static irqreturn_t logibm_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 122 {
 123         char dx, dy;
 124         unsigned char buttons;
 125
 126         outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
 127         dx = (inb(LOGIBM_DATA_PORT) & 0xf);
 128         outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
 129         dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
 130         outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
 131         dy = (inb(LOGIBM_DATA_PORT) & 0xf);
 132         outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
 133         buttons = inb(LOGIBM_DATA_PORT);
 134         dy |= (buttons & 0xf) << 4;
 135         buttons = ~buttons >> 5;
 136
 137         input_regs(&logibm_dev, regs);
 138         input_report_rel(&logibm_dev, REL_X, dx);
 139         input_report_rel(&logibm_dev, REL_Y, dy);
 140         input_report_key(&logibm_dev, BTN_RIGHT,  buttons & 1);
 141         input_report_key(&logibm_dev, BTN_MIDDLE, buttons & 2);
 142         input_report_key(&logibm_dev, BTN_LEFT,   buttons & 4);
 143         input_sync(&logibm_dev);
 144
 145         outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
 146         return IRQ_HANDLED;
 147 }
 148
 149 static int __init logibm_init(void)
 150 {
 151         if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
 152                 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
 153                 return -EBUSY;
 154         }
 155
 156         outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
 157         outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
 158         udelay(100);
 159
 160         if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
 161                 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 162                 printk(KERN_ERR "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
 163                 return -ENODEV;
 164         }
 165
 166         outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
 167         outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
 168
 169         input_register_device(&logibm_dev);
 170
 171         printk(KERN_INFO "input: Logitech bus mouse at %#x irq %d\n", LOGIBM_BASE, logibm_irq);
 172
 173         return 0;
 174 }
 175
 176 static void __exit logibm_exit(void)
 177 {
 178         input_unregister_device(&logibm_dev);
 179         release_region(LOGIBM_BASE, LOGIBM_EXTENT);
 180 }
 181
 182 module_init(logibm_init);
 183 module_exit(logibm_exit);