drivers/input/joystick/magellan.c

   1 /*
   2  * $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2001 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * Magellan and Space Mouse 6dof controller driver for Linux
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  *  Should you need to contact me, the author, you can do so either by
  27  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  28  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <linux/input.h>
  35 #include <linux/serio.h>
  36 #include <linux/init.h>
  37
  38 #define DRIVER_DESC     "Magellan and SpaceMouse 6dof controller driver"
  39
  40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41 MODULE_DESCRIPTION(DRIVER_DESC);
  42 MODULE_LICENSE("GPL");
  43
  44 /*
  45  * Definitions & global arrays.
  46  */
  47
  48 #define MAGELLAN_MAX_LENGTH     32
  49
  50 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
  51 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
  52
  53 /*
  54  * Per-Magellan data.
  55  */
  56
  57 struct magellan {
  58         struct input_dev *dev;
  59         int idx;
  60         unsigned char data[MAGELLAN_MAX_LENGTH];
  61         char phys[32];
  62 };
  63
  64 /*
  65  * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
  66  * have correct upper nibbles for the lower ones, if not, the packet will
  67  * be thrown away. It also strips these upper halves to simplify further
  68  * processing.
  69  */
  70
  71 static int magellan_crunch_nibbles(unsigned char *data, int count)
  72 {
  73         static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
  74
  75         do {
  76                 if (data[count] == nibbles[data[count] & 0xf])
  77                         data[count] = data[count] & 0xf;
  78                 else
  79                         return -1;
  80         } while (--count);
  81
  82         return 0;
  83 }
  84
  85 static void magellan_process_packet(struct magellan* magellan, struct pt_regs *regs)
  86 {
  87         struct input_dev *dev = magellan->dev;
  88         unsigned char *data = magellan->data;
  89         int i, t;
  90
  91         if (!magellan->idx) return;
  92
  93         input_regs(dev, regs);
  94
  95         switch (magellan->data[0]) {
  96
  97                 case 'd':                               /* Axis data */
  98                         if (magellan->idx != 25) return;
  99                         if (magellan_crunch_nibbles(data, 24)) return;
 100                         for (i = 0; i < 6; i++)
 101                                 input_report_abs(dev, magellan_axes[i],
 102                                         (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
 103                                          data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
 104                         break;
 105
 106                 case 'k':                               /* Button data */
 107                         if (magellan->idx != 4) return;
 108                         if (magellan_crunch_nibbles(data, 3)) return;
 109                         t = (data[1] << 1) | (data[2] << 5) | data[3];
 110                         for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
 111                         break;
 112         }
 113
 114         input_sync(dev);
 115 }
 116
 117 static irqreturn_t magellan_interrupt(struct serio *serio,
 118                 unsigned char data, unsigned int flags, struct pt_regs *regs)
 119 {
 120         struct magellan* magellan = serio_get_drvdata(serio);
 121
 122         if (data == '\r') {
 123                 magellan_process_packet(magellan, regs);
 124                 magellan->idx = 0;
 125         } else {
 126                 if (magellan->idx < MAGELLAN_MAX_LENGTH)
 127                         magellan->data[magellan->idx++] = data;
 128         }
 129         return IRQ_HANDLED;
 130 }
 131
 132 /*
 133  * magellan_disconnect() is the opposite of magellan_connect()
 134  */
 135
 136 static void magellan_disconnect(struct serio *serio)
 137 {
 138         struct magellan* magellan = serio_get_drvdata(serio);
 139
 140         serio_close(serio);
 141         serio_set_drvdata(serio, NULL);
 142         input_unregister_device(magellan->dev);
 143         kfree(magellan);
 144 }
 145
 146 /*
 147  * magellan_connect() is the routine that is called when someone adds a
 148  * new serio device that supports Magellan protocol and registers it as
 149  * an input device.
 150  */
 151
 152 static int magellan_connect(struct serio *serio, struct serio_driver *drv)
 153 {
 154         struct magellan *magellan;
 155         struct input_dev *input_dev;
 156         int err = -ENOMEM;
 157         int i;
 158
 159         magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
 160         input_dev = input_allocate_device();
 161         if (!magellan || !input_dev)
 162                 goto fail;
 163
 164         magellan->dev = input_dev;
 165         snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
 166
 167         input_dev->name = "LogiCad3D Magellan / SpaceMouse";
 168         input_dev->phys = magellan->phys;
 169         input_dev->id.bustype = BUS_RS232;
 170         input_dev->id.vendor = SERIO_MAGELLAN;
 171         input_dev->id.product = 0x0001;
 172         input_dev->id.version = 0x0100;
 173         input_dev->cdev.dev = &serio->dev;
 174         input_dev->private = magellan;
 175
 176         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 177
 178         for (i = 0; i < 9; i++)
 179                 set_bit(magellan_buttons[i], input_dev->keybit);
 180
 181         for (i = 0; i < 6; i++)
 182                 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
 183
 184         serio_set_drvdata(serio, magellan);
 185
 186         err = serio_open(serio, drv);
 187         if (err)
 188                 goto fail;
 189
 190         input_register_device(magellan->dev);
 191         return 0;
 192
 193  fail:  serio_set_drvdata(serio, NULL);
 194         input_free_device(input_dev);
 195         kfree(magellan);
 196         return err;
 197 }
 198
 199 /*
 200  * The serio driver structure.
 201  */
 202
 203 static struct serio_device_id magellan_serio_ids[] = {
 204         {
 205                 .type   = SERIO_RS232,
 206                 .proto  = SERIO_MAGELLAN,
 207                 .id     = SERIO_ANY,
 208                 .extra  = SERIO_ANY,
 209         },
 210         { 0 }
 211 };
 212
 213 MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
 214
 215 static struct serio_driver magellan_drv = {
 216         .driver         = {
 217                 .name   = "magellan",
 218         },
 219         .description    = DRIVER_DESC,
 220         .id_table       = magellan_serio_ids,
 221         .interrupt      = magellan_interrupt,
 222         .connect        = magellan_connect,
 223         .disconnect     = magellan_disconnect,
 224 };
 225
 226 /*
 227  * The functions for inserting/removing us as a module.
 228  */
 229
 230 static int __init magellan_init(void)
 231 {
 232         serio_register_driver(&magellan_drv);
 233         return 0;
 234 }
 235
 236 static void __exit magellan_exit(void)
 237 {
 238         serio_unregister_driver(&magellan_drv);
 239 }
 240
 241 module_init(magellan_init);
 242 module_exit(magellan_exit);