drivers/input/joystick/magellan.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * Magellan and Space Mouse 6dof controller driver for Linux
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/input.h>
  29 #include <linux/serio.h>
  30
  31 #define DRIVER_DESC     "Magellan and SpaceMouse 6dof controller driver"
  32
  33 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  34 MODULE_DESCRIPTION(DRIVER_DESC);
  35 MODULE_LICENSE("GPL");
  36
  37 /*
  38  * Definitions & global arrays.
  39  */
  40
  41 #define MAGELLAN_MAX_LENGTH     32
  42
  43 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
  44 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
  45
  46 /*
  47  * Per-Magellan data.
  48  */
  49
  50 struct magellan {
  51         struct input_dev *dev;
  52         int idx;
  53         unsigned char data[MAGELLAN_MAX_LENGTH];
  54         char phys[32];
  55 };
  56
  57 /*
  58  * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
  59  * have correct upper nibbles for the lower ones, if not, the packet will
  60  * be thrown away. It also strips these upper halves to simplify further
  61  * processing.
  62  */
  63
  64 static int magellan_crunch_nibbles(unsigned char *data, int count)
  65 {
  66         static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
  67
  68         do {
  69                 if (data[count] == nibbles[data[count] & 0xf])
  70                         data[count] = data[count] & 0xf;
  71                 else
  72                         return -1;
  73         } while (--count);
  74
  75         return 0;
  76 }
  77
  78 static void magellan_process_packet(struct magellan* magellan)
  79 {
  80         struct input_dev *dev = magellan->dev;
  81         unsigned char *data = magellan->data;
  82         int i, t;
  83
  84         if (!magellan->idx) return;
  85
  86         switch (magellan->data[0]) {
  87
  88                 case 'd':                               /* Axis data */
  89                         if (magellan->idx != 25) return;
  90                         if (magellan_crunch_nibbles(data, 24)) return;
  91                         for (i = 0; i < 6; i++)
  92                                 input_report_abs(dev, magellan_axes[i],
  93                                         (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
  94                                          data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
  95                         break;
  96
  97                 case 'k':                               /* Button data */
  98                         if (magellan->idx != 4) return;
  99                         if (magellan_crunch_nibbles(data, 3)) return;
 100                         t = (data[1] << 1) | (data[2] << 5) | data[3];
 101                         for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
 102                         break;
 103         }
 104
 105         input_sync(dev);
 106 }
 107
 108 static irqreturn_t magellan_interrupt(struct serio *serio,
 109                 unsigned char data, unsigned int flags)
 110 {
 111         struct magellan* magellan = serio_get_drvdata(serio);
 112
 113         if (data == '\r') {
 114                 magellan_process_packet(magellan);
 115                 magellan->idx = 0;
 116         } else {
 117                 if (magellan->idx < MAGELLAN_MAX_LENGTH)
 118                         magellan->data[magellan->idx++] = data;
 119         }
 120         return IRQ_HANDLED;
 121 }
 122
 123 /*
 124  * magellan_disconnect() is the opposite of magellan_connect()
 125  */
 126
 127 static void magellan_disconnect(struct serio *serio)
 128 {
 129         struct magellan* magellan = serio_get_drvdata(serio);
 130
 131         serio_close(serio);
 132         serio_set_drvdata(serio, NULL);
 133         input_unregister_device(magellan->dev);
 134         kfree(magellan);
 135 }
 136
 137 /*
 138  * magellan_connect() is the routine that is called when someone adds a
 139  * new serio device that supports Magellan protocol and registers it as
 140  * an input device.
 141  */
 142
 143 static int magellan_connect(struct serio *serio, struct serio_driver *drv)
 144 {
 145         struct magellan *magellan;
 146         struct input_dev *input_dev;
 147         int err = -ENOMEM;
 148         int i;
 149
 150         magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
 151         input_dev = input_allocate_device();
 152         if (!magellan || !input_dev)
 153                 goto fail1;
 154
 155         magellan->dev = input_dev;
 156         snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
 157
 158         input_dev->name = "LogiCad3D Magellan / SpaceMouse";
 159         input_dev->phys = magellan->phys;
 160         input_dev->id.bustype = BUS_RS232;
 161         input_dev->id.vendor = SERIO_MAGELLAN;
 162         input_dev->id.product = 0x0001;
 163         input_dev->id.version = 0x0100;
 164         input_dev->dev.parent = &serio->dev;
 165
 166         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 167
 168         for (i = 0; i < 9; i++)
 169                 set_bit(magellan_buttons[i], input_dev->keybit);
 170
 171         for (i = 0; i < 6; i++)
 172                 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
 173
 174         serio_set_drvdata(serio, magellan);
 175
 176         err = serio_open(serio, drv);
 177         if (err)
 178                 goto fail2;
 179
 180         err = input_register_device(magellan->dev);
 181         if (err)
 182                 goto fail3;
 183
 184         return 0;
 185
 186  fail3: serio_close(serio);
 187  fail2: serio_set_drvdata(serio, NULL);
 188  fail1: input_free_device(input_dev);
 189         kfree(magellan);
 190         return err;
 191 }
 192
 193 /*
 194  * The serio driver structure.
 195  */
 196
 197 static const struct serio_device_id magellan_serio_ids[] = {
 198         {
 199                 .type   = SERIO_RS232,
 200                 .proto  = SERIO_MAGELLAN,
 201                 .id     = SERIO_ANY,
 202                 .extra  = SERIO_ANY,
 203         },
 204         { 0 }
 205 };
 206
 207 MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
 208
 209 static struct serio_driver magellan_drv = {
 210         .driver         = {
 211                 .name   = "magellan",
 212         },
 213         .description    = DRIVER_DESC,
 214         .id_table       = magellan_serio_ids,
 215         .interrupt      = magellan_interrupt,
 216         .connect        = magellan_connect,
 217         .disconnect     = magellan_disconnect,
 218 };
 219
 220 module_serio_driver(magellan_drv);