drivers/input/joystick/spaceball.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  *      David Thompson
   7  *      Joseph Krahn
   8  */
   9
  10 /*
  11  * SpaceTec SpaceBall 2003/3003/4000 FLX driver for Linux
  12  */
  13
  14 /*
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <linux/input.h>
  21 #include <linux/serio.h>
  22
  23 #define DRIVER_DESC     "SpaceTec SpaceBall 2003/3003/4000 FLX driver"
  24
  25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  26 MODULE_DESCRIPTION(DRIVER_DESC);
  27 MODULE_LICENSE("GPL");
  28
  29 /*
  30  * Constants.
  31  */
  32
  33 #define SPACEBALL_MAX_LENGTH    128
  34 #define SPACEBALL_MAX_ID        9
  35
  36 #define SPACEBALL_1003      1
  37 #define SPACEBALL_2003B     3
  38 #define SPACEBALL_2003C     4
  39 #define SPACEBALL_3003C     7
  40 #define SPACEBALL_4000FLX   8
  41 #define SPACEBALL_4000FLX_L 9
  42
  43 static int spaceball_axes[] = { ABS_X, ABS_Z, ABS_Y, ABS_RX, ABS_RZ, ABS_RY };
  44 static char *spaceball_names[] = {
  45         "?", "SpaceTec SpaceBall 1003", "SpaceTec SpaceBall 2003", "SpaceTec SpaceBall 2003B",
  46         "SpaceTec SpaceBall 2003C", "SpaceTec SpaceBall 3003", "SpaceTec SpaceBall SpaceController",
  47         "SpaceTec SpaceBall 3003C", "SpaceTec SpaceBall 4000FLX", "SpaceTec SpaceBall 4000FLX Lefty" };
  48
  49 /*
  50  * Per-Ball data.
  51  */
  52
  53 struct spaceball {
  54         struct input_dev *dev;
  55         int idx;
  56         int escape;
  57         unsigned char data[SPACEBALL_MAX_LENGTH];
  58         char phys[32];
  59 };
  60
  61 /*
  62  * spaceball_process_packet() decodes packets the driver receives from the
  63  * SpaceBall.
  64  */
  65
  66 static void spaceball_process_packet(struct spaceball* spaceball)
  67 {
  68         struct input_dev *dev = spaceball->dev;
  69         unsigned char *data = spaceball->data;
  70         int i;
  71
  72         if (spaceball->idx < 2) return;
  73
  74         switch (spaceball->data[0]) {
  75
  76                 case 'D':                                       /* Ball data */
  77                         if (spaceball->idx != 15) return;
  78                         for (i = 0; i < 6; i++)
  79                                 input_report_abs(dev, spaceball_axes[i],
  80                                         (__s16)((data[2 * i + 3] << 8) | data[2 * i + 2]));
  81                         break;
  82
  83                 case 'K':                                       /* Button data */
  84                         if (spaceball->idx != 3) return;
  85                         input_report_key(dev, BTN_1, (data[2] & 0x01) || (data[2] & 0x20));
  86                         input_report_key(dev, BTN_2, data[2] & 0x02);
  87                         input_report_key(dev, BTN_3, data[2] & 0x04);
  88                         input_report_key(dev, BTN_4, data[2] & 0x08);
  89                         input_report_key(dev, BTN_5, data[1] & 0x01);
  90                         input_report_key(dev, BTN_6, data[1] & 0x02);
  91                         input_report_key(dev, BTN_7, data[1] & 0x04);
  92                         input_report_key(dev, BTN_8, data[1] & 0x10);
  93                         break;
  94
  95                 case '.':                                       /* Advanced button data */
  96                         if (spaceball->idx != 3) return;
  97                         input_report_key(dev, BTN_1, data[2] & 0x01);
  98                         input_report_key(dev, BTN_2, data[2] & 0x02);
  99                         input_report_key(dev, BTN_3, data[2] & 0x04);
 100                         input_report_key(dev, BTN_4, data[2] & 0x08);
 101                         input_report_key(dev, BTN_5, data[2] & 0x10);
 102                         input_report_key(dev, BTN_6, data[2] & 0x20);
 103                         input_report_key(dev, BTN_7, data[2] & 0x80);
 104                         input_report_key(dev, BTN_8, data[1] & 0x01);
 105                         input_report_key(dev, BTN_9, data[1] & 0x02);
 106                         input_report_key(dev, BTN_A, data[1] & 0x04);
 107                         input_report_key(dev, BTN_B, data[1] & 0x08);
 108                         input_report_key(dev, BTN_C, data[1] & 0x10);
 109                         input_report_key(dev, BTN_MODE, data[1] & 0x20);
 110                         break;
 111
 112                 case 'E':                                       /* Device error */
 113                         spaceball->data[spaceball->idx - 1] = 0;
 114                         printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1);
 115                         break;
 116
 117                 case '?':                                       /* Bad command packet */
 118                         spaceball->data[spaceball->idx - 1] = 0;
 119                         printk(KERN_ERR "spaceball: Bad command. [%s]\n", spaceball->data + 1);
 120                         break;
 121         }
 122
 123         input_sync(dev);
 124 }
 125
 126 /*
 127  * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor,
 128  * and end in 0x0d. It uses '^' as an escape for CR, XOFF and XON characters which
 129  * can occur in the axis values.
 130  */
 131
 132 static irqreturn_t spaceball_interrupt(struct serio *serio,
 133                 unsigned char data, unsigned int flags)
 134 {
 135         struct spaceball *spaceball = serio_get_drvdata(serio);
 136
 137         switch (data) {
 138                 case 0xd:
 139                         spaceball_process_packet(spaceball);
 140                         spaceball->idx = 0;
 141                         spaceball->escape = 0;
 142                         break;
 143                 case '^':
 144                         if (!spaceball->escape) {
 145                                 spaceball->escape = 1;
 146                                 break;
 147                         }
 148                         spaceball->escape = 0;
 149                         fallthrough;
 150                 case 'M':
 151                 case 'Q':
 152                 case 'S':
 153                         if (spaceball->escape) {
 154                                 spaceball->escape = 0;
 155                                 data &= 0x1f;
 156                         }
 157                         fallthrough;
 158                 default:
 159                         if (spaceball->escape)
 160                                 spaceball->escape = 0;
 161                         if (spaceball->idx < SPACEBALL_MAX_LENGTH)
 162                                 spaceball->data[spaceball->idx++] = data;
 163                         break;
 164         }
 165         return IRQ_HANDLED;
 166 }
 167
 168 /*
 169  * spaceball_disconnect() is the opposite of spaceball_connect()
 170  */
 171
 172 static void spaceball_disconnect(struct serio *serio)
 173 {
 174         struct spaceball* spaceball = serio_get_drvdata(serio);
 175
 176         serio_close(serio);
 177         serio_set_drvdata(serio, NULL);
 178         input_unregister_device(spaceball->dev);
 179         kfree(spaceball);
 180 }
 181
 182 /*
 183  * spaceball_connect() is the routine that is called when someone adds a
 184  * new serio device that supports Spaceball protocol and registers it as
 185  * an input device.
 186  */
 187
 188 static int spaceball_connect(struct serio *serio, struct serio_driver *drv)
 189 {
 190         struct spaceball *spaceball;
 191         struct input_dev *input_dev;
 192         int err = -ENOMEM;
 193         int i, id;
 194
 195         if ((id = serio->id.id) > SPACEBALL_MAX_ID)
 196                 return -ENODEV;
 197
 198         spaceball = kmalloc(sizeof(struct spaceball), GFP_KERNEL);
 199         input_dev = input_allocate_device();
 200         if (!spaceball || !input_dev)
 201                 goto fail1;
 202
 203         spaceball->dev = input_dev;
 204         snprintf(spaceball->phys, sizeof(spaceball->phys), "%s/input0", serio->phys);
 205
 206         input_dev->name = spaceball_names[id];
 207         input_dev->phys = spaceball->phys;
 208         input_dev->id.bustype = BUS_RS232;
 209         input_dev->id.vendor = SERIO_SPACEBALL;
 210         input_dev->id.product = id;
 211         input_dev->id.version = 0x0100;
 212         input_dev->dev.parent = &serio->dev;
 213
 214         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 215
 216         switch (id) {
 217                 case SPACEBALL_4000FLX:
 218                 case SPACEBALL_4000FLX_L:
 219                         input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_9);
 220                         input_dev->keybit[BIT_WORD(BTN_A)] |= BIT_MASK(BTN_A) |
 221                                 BIT_MASK(BTN_B) | BIT_MASK(BTN_C) |
 222                                 BIT_MASK(BTN_MODE);
 223                         fallthrough;
 224                 default:
 225                         input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_2) |
 226                                 BIT_MASK(BTN_3) | BIT_MASK(BTN_4) |
 227                                 BIT_MASK(BTN_5) | BIT_MASK(BTN_6) |
 228                                 BIT_MASK(BTN_7) | BIT_MASK(BTN_8);
 229                         fallthrough;
 230                 case SPACEBALL_3003C:
 231                         input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1) |
 232                                 BIT_MASK(BTN_8);
 233         }
 234
 235         for (i = 0; i < 3; i++) {
 236                 input_set_abs_params(input_dev, ABS_X + i, -8000, 8000, 8, 40);
 237                 input_set_abs_params(input_dev, ABS_RX + i, -1600, 1600, 2, 8);
 238         }
 239
 240         serio_set_drvdata(serio, spaceball);
 241
 242         err = serio_open(serio, drv);
 243         if (err)
 244                 goto fail2;
 245
 246         err = input_register_device(spaceball->dev);
 247         if (err)
 248                 goto fail3;
 249
 250         return 0;
 251
 252  fail3: serio_close(serio);
 253  fail2: serio_set_drvdata(serio, NULL);
 254  fail1: input_free_device(input_dev);
 255         kfree(spaceball);
 256         return err;
 257 }
 258
 259 /*
 260  * The serio driver structure.
 261  */
 262
 263 static const struct serio_device_id spaceball_serio_ids[] = {
 264         {
 265                 .type   = SERIO_RS232,
 266                 .proto  = SERIO_SPACEBALL,
 267                 .id     = SERIO_ANY,
 268                 .extra  = SERIO_ANY,
 269         },
 270         { 0 }
 271 };
 272
 273 MODULE_DEVICE_TABLE(serio, spaceball_serio_ids);
 274
 275 static struct serio_driver spaceball_drv = {
 276         .driver         = {
 277                 .name   = "spaceball",
 278         },
 279         .description    = DRIVER_DESC,
 280         .id_table       = spaceball_serio_ids,
 281         .interrupt      = spaceball_interrupt,
 282         .connect        = spaceball_connect,
 283         .disconnect     = spaceball_disconnect,
 284 };
 285
 286 module_serio_driver(spaceball_drv);