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  *  Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32 #include <linux/input.h>
  33 #include <linux/serio.h>
  34 #include <linux/init.h>
  35
  36 #define DRIVER_DESC     "Magellan and SpaceMouse 6dof controller driver"
  37
  38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39 MODULE_DESCRIPTION(DRIVER_DESC);
  40 MODULE_LICENSE("GPL");
  41
  42 /*
  43  * Definitions & global arrays.
  44  */
  45
  46 #define MAGELLAN_MAX_LENGTH     32
  47
  48 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
  49 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
  50
  51 /*
  52  * Per-Magellan data.
  53  */
  54
  55 struct magellan {
  56         struct input_dev *dev;
  57         int idx;
  58         unsigned char data[MAGELLAN_MAX_LENGTH];
  59         char phys[32];
  60 };
  61
  62 /*
  63  * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
  64  * have correct upper nibbles for the lower ones, if not, the packet will
  65  * be thrown away. It also strips these upper halves to simplify further
  66  * processing.
  67  */
  68
  69 static int magellan_crunch_nibbles(unsigned char *data, int count)
  70 {
  71         static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
  72
  73         do {
  74                 if (data[count] == nibbles[data[count] & 0xf])
  75                         data[count] = data[count] & 0xf;
  76                 else
  77                         return -1;
  78         } while (--count);
  79
  80         return 0;
  81 }
  82
  83 static void magellan_process_packet(struct magellan* magellan)
  84 {
  85         struct input_dev *dev = magellan->dev;
  86         unsigned char *data = magellan->data;
  87         int i, t;
  88
  89         if (!magellan->idx) return;
  90
  91         switch (magellan->data[0]) {
  92
  93                 case 'd':                               /* Axis data */
  94                         if (magellan->idx != 25) return;
  95                         if (magellan_crunch_nibbles(data, 24)) return;
  96                         for (i = 0; i < 6; i++)
  97                                 input_report_abs(dev, magellan_axes[i],
  98                                         (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
  99                                          data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
 100                         break;
 101
 102                 case 'k':                               /* Button data */
 103                         if (magellan->idx != 4) return;
 104                         if (magellan_crunch_nibbles(data, 3)) return;
 105                         t = (data[1] << 1) | (data[2] << 5) | data[3];
 106                         for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
 107                         break;
 108         }
 109
 110         input_sync(dev);
 111 }
 112
 113 static irqreturn_t magellan_interrupt(struct serio *serio,
 114                 unsigned char data, unsigned int flags)
 115 {
 116         struct magellan* magellan = serio_get_drvdata(serio);
 117
 118         if (data == '\r') {
 119                 magellan_process_packet(magellan);
 120                 magellan->idx = 0;
 121         } else {
 122                 if (magellan->idx < MAGELLAN_MAX_LENGTH)
 123                         magellan->data[magellan->idx++] = data;
 124         }
 125         return IRQ_HANDLED;
 126 }
 127
 128 /*
 129  * magellan_disconnect() is the opposite of magellan_connect()
 130  */
 131
 132 static void magellan_disconnect(struct serio *serio)
 133 {
 134         struct magellan* magellan = serio_get_drvdata(serio);
 135
 136         serio_close(serio);
 137         serio_set_drvdata(serio, NULL);
 138         input_unregister_device(magellan->dev);
 139         kfree(magellan);
 140 }
 141
 142 /*
 143  * magellan_connect() is the routine that is called when someone adds a
 144  * new serio device that supports Magellan protocol and registers it as
 145  * an input device.
 146  */
 147
 148 static int magellan_connect(struct serio *serio, struct serio_driver *drv)
 149 {
 150         struct magellan *magellan;
 151         struct input_dev *input_dev;
 152         int err = -ENOMEM;
 153         int i;
 154
 155         magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
 156         input_dev = input_allocate_device();
 157         if (!magellan || !input_dev)
 158                 goto fail1;
 159
 160         magellan->dev = input_dev;
 161         snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
 162
 163         input_dev->name = "LogiCad3D Magellan / SpaceMouse";
 164         input_dev->phys = magellan->phys;
 165         input_dev->id.bustype = BUS_RS232;
 166         input_dev->id.vendor = SERIO_MAGELLAN;
 167         input_dev->id.product = 0x0001;
 168         input_dev->id.version = 0x0100;
 169         input_dev->dev.parent = &serio->dev;
 170
 171         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 172
 173         for (i = 0; i < 9; i++)
 174                 set_bit(magellan_buttons[i], input_dev->keybit);
 175
 176         for (i = 0; i < 6; i++)
 177                 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
 178
 179         serio_set_drvdata(serio, magellan);
 180
 181         err = serio_open(serio, drv);
 182         if (err)
 183                 goto fail2;
 184
 185         err = input_register_device(magellan->dev);
 186         if (err)
 187                 goto fail3;
 188
 189         return 0;
 190
 191  fail3: serio_close(serio);
 192  fail2: serio_set_drvdata(serio, NULL);
 193  fail1: input_free_device(input_dev);
 194         kfree(magellan);
 195         return err;
 196 }
 197
 198 /*
 199  * The serio driver structure.
 200  */
 201
 202 static struct serio_device_id magellan_serio_ids[] = {
 203         {
 204                 .type   = SERIO_RS232,
 205                 .proto  = SERIO_MAGELLAN,
 206                 .id     = SERIO_ANY,
 207                 .extra  = SERIO_ANY,
 208         },
 209         { 0 }
 210 };
 211
 212 MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
 213
 214 static struct serio_driver magellan_drv = {
 215         .driver         = {
 216                 .name   = "magellan",
 217         },
 218         .description    = DRIVER_DESC,
 219         .id_table       = magellan_serio_ids,
 220         .interrupt      = magellan_interrupt,
 221         .connect        = magellan_connect,
 222         .disconnect     = magellan_disconnect,
 223 };
 224
 225 /*
 226  * The functions for inserting/removing us as a module.
 227  */
 228
 229 static int __init magellan_init(void)
 230 {
 231         return serio_register_driver(&magellan_drv);
 232 }
 233
 234 static void __exit magellan_exit(void)
 235 {
 236         serio_unregister_driver(&magellan_drv);
 237 }
 238
 239 module_init(magellan_init);
 240 module_exit(magellan_exit);