drivers/input/joydev.c

   1 /*
   2  * Joystick device driver for the input driver suite.
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 1999 Colin Van Dyke
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <asm/io.h>
  14 #include <asm/system.h>
  15 #include <linux/delay.h>
  16 #include <linux/errno.h>
  17 #include <linux/joystick.h>
  18 #include <linux/input.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/module.h>
  25 #include <linux/poll.h>
  26 #include <linux/init.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/device.h>
  29 #include <linux/devfs_fs_kernel.h>
  30
  31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  32 MODULE_DESCRIPTION("Joystick device interfaces");
  33 MODULE_SUPPORTED_DEVICE("input/js");
  34 MODULE_LICENSE("GPL");
  35
  36 #define JOYDEV_MINOR_BASE       0
  37 #define JOYDEV_MINORS           16
  38 #define JOYDEV_BUFFER_SIZE      64
  39
  40 #define MSECS(t)        (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
  41
  42 struct joydev {
  43         int exist;
  44         int open;
  45         int minor;
  46         char name[16];
  47         struct input_handle handle;
  48         wait_queue_head_t wait;
  49         struct list_head list;
  50         struct js_corr corr[ABS_MAX];
  51         struct JS_DATA_SAVE_TYPE glue;
  52         int nabs;
  53         int nkey;
  54         __u16 keymap[KEY_MAX - BTN_MISC];
  55         __u16 keypam[KEY_MAX - BTN_MISC];
  56         __u8 absmap[ABS_MAX];
  57         __u8 abspam[ABS_MAX];
  58         __s16 abs[ABS_MAX];
  59 };
  60
  61 struct joydev_list {
  62         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  63         int head;
  64         int tail;
  65         int startup;
  66         struct fasync_struct *fasync;
  67         struct joydev *joydev;
  68         struct list_head node;
  69 };
  70
  71 static struct joydev *joydev_table[JOYDEV_MINORS];
  72
  73 static int joydev_correct(int value, struct js_corr *corr)
  74 {
  75         switch (corr->type) {
  76                 case JS_CORR_NONE:
  77                         break;
  78                 case JS_CORR_BROKEN:
  79                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  80                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  81                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  82                         break;
  83                 default:
  84                         return 0;
  85         }
  86
  87         if (value < -32767) return -32767;
  88         if (value >  32767) return  32767;
  89
  90         return value;
  91 }
  92
  93 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  94 {
  95         struct joydev *joydev = handle->private;
  96         struct joydev_list *list;
  97         struct js_event event;
  98
  99         switch (type) {
 100
 101                 case EV_KEY:
 102                         if (code < BTN_MISC || value == 2) return;
 103                         event.type = JS_EVENT_BUTTON;
 104                         event.number = joydev->keymap[code - BTN_MISC];
 105                         event.value = value;
 106                         break;
 107
 108                 case EV_ABS:
 109                         event.type = JS_EVENT_AXIS;
 110                         event.number = joydev->absmap[code];
 111                         event.value = joydev_correct(value, joydev->corr + event.number);
 112                         if (event.value == joydev->abs[event.number]) return;
 113                         joydev->abs[event.number] = event.value;
 114                         break;
 115
 116                 default:
 117                         return;
 118         }
 119
 120         event.time = MSECS(jiffies);
 121
 122         list_for_each_entry(list, &joydev->list, node) {
 123
 124                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
 125
 126                 if (list->startup == joydev->nabs + joydev->nkey)
 127                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 128                                 list->startup = 0;
 129
 130                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
 131         }
 132
 133         wake_up_interruptible(&joydev->wait);
 134 }
 135
 136 static int joydev_fasync(int fd, struct file *file, int on)
 137 {
 138         int retval;
 139         struct joydev_list *list = file->private_data;
 140         retval = fasync_helper(fd, file, on, &list->fasync);
 141         return retval < 0 ? retval : 0;
 142 }
 143
 144 static void joydev_free(struct joydev *joydev)
 145 {
 146         devfs_remove("input/js%d", joydev->minor);
 147         joydev_table[joydev->minor] = NULL;
 148         class_simple_device_remove(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 149         kfree(joydev);
 150 }
 151
 152 static int joydev_release(struct inode * inode, struct file * file)
 153 {
 154         struct joydev_list *list = file->private_data;
 155
 156         joydev_fasync(-1, file, 0);
 157
 158         list_del(&list->node);
 159
 160         if (!--list->joydev->open) {
 161                 if (list->joydev->exist)
 162                         input_close_device(&list->joydev->handle);
 163                 else
 164                         joydev_free(list->joydev);
 165         }
 166
 167         kfree(list);
 168         return 0;
 169 }
 170
 171 static int joydev_open(struct inode *inode, struct file *file)
 172 {
 173         struct joydev_list *list;
 174         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 175
 176         if (i >= JOYDEV_MINORS || !joydev_table[i])
 177                 return -ENODEV;
 178
 179         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 180                 return -ENOMEM;
 181         memset(list, 0, sizeof(struct joydev_list));
 182
 183         list->joydev = joydev_table[i];
 184         list_add_tail(&list->node, &joydev_table[i]->list);
 185         file->private_data = list;
 186
 187         if (!list->joydev->open++)
 188                 if (list->joydev->exist)
 189                         input_open_device(&list->joydev->handle);
 190
 191         return 0;
 192 }
 193
 194 static ssize_t joydev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
 195 {
 196         return -EINVAL;
 197 }
 198
 199 static ssize_t joydev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
 200 {
 201         struct joydev_list *list = file->private_data;
 202         struct joydev *joydev = list->joydev;
 203         struct input_dev *input = joydev->handle.dev;
 204         int retval = 0;
 205
 206         if (!list->joydev->exist)
 207                 return -ENODEV;
 208
 209         if (count < sizeof(struct js_event))
 210                 return -EINVAL;
 211
 212         if (count == sizeof(struct JS_DATA_TYPE)) {
 213
 214                 struct JS_DATA_TYPE data;
 215                 int i;
 216
 217                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 218                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 219                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 220                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 221
 222                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 223                         return -EFAULT;
 224
 225                 list->startup = 0;
 226                 list->tail = list->head;
 227
 228                 return sizeof(struct JS_DATA_TYPE);
 229         }
 230
 231         if (list->startup == joydev->nabs + joydev->nkey
 232                 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
 233                         return -EAGAIN;
 234
 235         retval = wait_event_interruptible(list->joydev->wait, list->joydev->exist
 236                 && (list->startup < joydev->nabs + joydev->nkey || list->head != list->tail));
 237
 238         if (retval)
 239                 return retval;
 240
 241         if (!list->joydev->exist)
 242                 return -ENODEV;
 243
 244         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 245
 246                 struct js_event event;
 247
 248                 event.time = MSECS(jiffies);
 249
 250                 if (list->startup < joydev->nkey) {
 251                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 252                         event.number = list->startup;
 253                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 254                 } else {
 255                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 256                         event.number = list->startup - joydev->nkey;
 257                         event.value = joydev->abs[event.number];
 258                 }
 259
 260                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 261                         return -EFAULT;
 262
 263                 list->startup++;
 264                 retval += sizeof(struct js_event);
 265         }
 266
 267         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
 268
 269                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
 270                         return -EFAULT;
 271
 272                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 273                 retval += sizeof(struct js_event);
 274         }
 275
 276         return retval;
 277 }
 278
 279 /* No kernel lock - fine */
 280 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 281 {
 282         struct joydev_list *list = file->private_data;
 283         poll_wait(file, &list->joydev->wait, wait);
 284         if (list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey)
 285                 return POLLIN | POLLRDNORM;
 286         return 0;
 287 }
 288
 289 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 290 {
 291         struct joydev_list *list = file->private_data;
 292         struct joydev *joydev = list->joydev;
 293         struct input_dev *dev = joydev->handle.dev;
 294         int i, j;
 295
 296         if (!joydev->exist) return -ENODEV;
 297
 298         switch (cmd) {
 299
 300                 case JS_SET_CAL:
 301                         return copy_from_user(&joydev->glue.JS_CORR, (struct JS_DATA_TYPE *) arg,
 302                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 303                 case JS_GET_CAL:
 304                         return copy_to_user((struct JS_DATA_TYPE *) arg, &joydev->glue.JS_CORR,
 305                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 306                 case JS_SET_TIMEOUT:
 307                         return get_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 308                 case JS_GET_TIMEOUT:
 309                         return put_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 310                 case JS_SET_TIMELIMIT:
 311                         return get_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 312                 case JS_GET_TIMELIMIT:
 313                         return put_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 314                 case JS_SET_ALL:
 315                         return copy_from_user(&joydev->glue, (struct JS_DATA_SAVE_TYPE *) arg,
 316                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 317                 case JS_GET_ALL:
 318                         return copy_to_user((struct JS_DATA_SAVE_TYPE *) arg, &joydev->glue,
 319                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 320
 321                 case JSIOCGVERSION:
 322                         return put_user(JS_VERSION, (__u32 *) arg);
 323                 case JSIOCGAXES:
 324                         return put_user(joydev->nabs, (__u8 *) arg);
 325                 case JSIOCGBUTTONS:
 326                         return put_user(joydev->nkey, (__u8 *) arg);
 327                 case JSIOCSCORR:
 328                         if (copy_from_user(joydev->corr, (struct js_corr *)arg,
 329                                       sizeof(struct js_corr) * joydev->nabs))
 330                             return -EFAULT;
 331                         for (i = 0; i < joydev->nabs; i++) {
 332                                 j = joydev->abspam[i];
 333                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 334                         }
 335                         return 0;
 336                 case JSIOCGCORR:
 337                         return copy_to_user((struct js_corr *) arg, joydev->corr,
 338                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 339                 case JSIOCSAXMAP:
 340                         if (copy_from_user(joydev->abspam, (__u8 *) arg, sizeof(__u8) * ABS_MAX))
 341                                 return -EFAULT;
 342                         for (i = 0; i < joydev->nabs; i++) {
 343                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
 344                                 joydev->absmap[joydev->abspam[i]] = i;
 345                         }
 346                         return 0;
 347                 case JSIOCGAXMAP:
 348                         return copy_to_user((__u8 *) arg, joydev->abspam,
 349                                                 sizeof(__u8) * ABS_MAX) ? -EFAULT : 0;
 350                 case JSIOCSBTNMAP:
 351                         if (copy_from_user(joydev->keypam, (__u16 *) arg, sizeof(__u16) * (KEY_MAX - BTN_MISC)))
 352                                 return -EFAULT;
 353                         for (i = 0; i < joydev->nkey; i++) {
 354                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
 355                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 356                         }
 357                         return 0;
 358                 case JSIOCGBTNMAP:
 359                         return copy_to_user((__u16 *) arg, joydev->keypam,
 360                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC)) ? -EFAULT : 0;
 361                 default:
 362                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 363                                 int len;
 364                                 if (!dev->name) return 0;
 365                                 len = strlen(dev->name) + 1;
 366                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 367                                 if (copy_to_user((char *) arg, dev->name, len)) return -EFAULT;
 368                                 return len;
 369                         }
 370         }
 371         return -EINVAL;
 372 }
 373
 374 static struct file_operations joydev_fops = {
 375         .owner =        THIS_MODULE,
 376         .read =         joydev_read,
 377         .write =        joydev_write,
 378         .poll =         joydev_poll,
 379         .open =         joydev_open,
 380         .release =      joydev_release,
 381         .ioctl =        joydev_ioctl,
 382         .fasync =       joydev_fasync,
 383 };
 384
 385 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 386 {
 387         struct joydev *joydev;
 388         int i, j, t, minor;
 389
 390         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 391         if (minor == JOYDEV_MINORS) {
 392                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 393                 return NULL;
 394         }
 395
 396         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
 397                 return NULL;
 398         memset(joydev, 0, sizeof(struct joydev));
 399
 400         INIT_LIST_HEAD(&joydev->list);
 401         init_waitqueue_head(&joydev->wait);
 402
 403         joydev->minor = minor;
 404         joydev->exist = 1;
 405         joydev->handle.dev = dev;
 406         joydev->handle.name = joydev->name;
 407         joydev->handle.handler = handler;
 408         joydev->handle.private = joydev;
 409         sprintf(joydev->name, "js%d", minor);
 410
 411         for (i = 0; i < ABS_MAX; i++)
 412                 if (test_bit(i, dev->absbit)) {
 413                         joydev->absmap[i] = joydev->nabs;
 414                         joydev->abspam[joydev->nabs] = i;
 415                         joydev->nabs++;
 416                 }
 417
 418         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC; i++)
 419                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 420                         joydev->keymap[i] = joydev->nkey;
 421                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 422                         joydev->nkey++;
 423                 }
 424
 425         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 426                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 427                         joydev->keymap[i] = joydev->nkey;
 428                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 429                         joydev->nkey++;
 430                 }
 431
 432         for (i = 0; i < joydev->nabs; i++) {
 433                 j = joydev->abspam[i];
 434                 if (dev->absmax[j] == dev->absmin[j]) {
 435                         joydev->corr[i].type = JS_CORR_NONE;
 436                         joydev->abs[i] = dev->abs[j];
 437                         continue;
 438                 }
 439                 joydev->corr[i].type = JS_CORR_BROKEN;
 440                 joydev->corr[i].prec = dev->absfuzz[j];
 441                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 442                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 443                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 444                         continue;
 445                 joydev->corr[i].coef[2] = (1 << 29) / t;
 446                 joydev->corr[i].coef[3] = (1 << 29) / t;
 447
 448                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 449         }
 450
 451         joydev_table[minor] = joydev;
 452
 453         devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 454                         S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
 455         class_simple_device_add(input_class,
 456                                 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 457                                 dev->dev, "js%d", minor);
 458
 459         return &joydev->handle;
 460 }
 461
 462 static void joydev_disconnect(struct input_handle *handle)
 463 {
 464         struct joydev *joydev = handle->private;
 465
 466         joydev->exist = 0;
 467
 468         if (joydev->open)
 469                 input_close_device(handle);
 470         else
 471                 joydev_free(joydev);
 472 }
 473
 474 static struct input_device_id joydev_blacklist[] = {
 475         {
 476                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 477                 .evbit = { BIT(EV_KEY) },
 478                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 479         },      /* Avoid itouchpads, touchscreens and tablets */
 480         { },    /* Terminating entry */
 481 };
 482
 483 static struct input_device_id joydev_ids[] = {
 484         {
 485                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 486                 .evbit = { BIT(EV_ABS) },
 487                 .absbit = { BIT(ABS_X) },
 488         },
 489         {
 490                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 491                 .evbit = { BIT(EV_ABS) },
 492                 .absbit = { BIT(ABS_WHEEL) },
 493         },
 494         {
 495                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 496                 .evbit = { BIT(EV_ABS) },
 497                 .absbit = { BIT(ABS_THROTTLE) },
 498         },
 499         { },    /* Terminating entry */
 500 };
 501
 502 MODULE_DEVICE_TABLE(input, joydev_ids);
 503
 504 static struct input_handler joydev_handler = {
 505         .event =        joydev_event,
 506         .connect =      joydev_connect,
 507         .disconnect =   joydev_disconnect,
 508         .fops =         &joydev_fops,
 509         .minor =        JOYDEV_MINOR_BASE,
 510         .name =         "joydev",
 511         .id_table =     joydev_ids,
 512         .blacklist =    joydev_blacklist,
 513 };
 514
 515 static int __init joydev_init(void)
 516 {
 517         input_register_handler(&joydev_handler);
 518         return 0;
 519 }
 520
 521 static void __exit joydev_exit(void)
 522 {
 523         input_unregister_handler(&joydev_handler);
 524 }
 525
 526 module_init(joydev_init);
 527 module_exit(joydev_exit);