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         joydev_table[joydev->minor] = NULL;
 147         kfree(joydev);
 148 }
 149
 150 static int joydev_release(struct inode * inode, struct file * file)
 151 {
 152         struct joydev_list *list = file->private_data;
 153
 154         joydev_fasync(-1, file, 0);
 155
 156         list_del(&list->node);
 157
 158         if (!--list->joydev->open) {
 159                 if (list->joydev->exist)
 160                         input_close_device(&list->joydev->handle);
 161                 else
 162                         joydev_free(list->joydev);
 163         }
 164
 165         kfree(list);
 166         return 0;
 167 }
 168
 169 static int joydev_open(struct inode *inode, struct file *file)
 170 {
 171         struct joydev_list *list;
 172         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 173
 174         if (i >= JOYDEV_MINORS || !joydev_table[i])
 175                 return -ENODEV;
 176
 177         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 178                 return -ENOMEM;
 179         memset(list, 0, sizeof(struct joydev_list));
 180
 181         list->joydev = joydev_table[i];
 182         list_add_tail(&list->node, &joydev_table[i]->list);
 183         file->private_data = list;
 184
 185         if (!list->joydev->open++)
 186                 if (list->joydev->exist)
 187                         input_open_device(&list->joydev->handle);
 188
 189         return 0;
 190 }
 191
 192 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 193 {
 194         return -EINVAL;
 195 }
 196
 197 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 198 {
 199         struct joydev_list *list = file->private_data;
 200         struct joydev *joydev = list->joydev;
 201         struct input_dev *input = joydev->handle.dev;
 202         int retval = 0;
 203
 204         if (!list->joydev->exist)
 205                 return -ENODEV;
 206
 207         if (count < sizeof(struct js_event))
 208                 return -EINVAL;
 209
 210         if (count == sizeof(struct JS_DATA_TYPE)) {
 211
 212                 struct JS_DATA_TYPE data;
 213                 int i;
 214
 215                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 216                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 217                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 218                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 219
 220                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 221                         return -EFAULT;
 222
 223                 list->startup = 0;
 224                 list->tail = list->head;
 225
 226                 return sizeof(struct JS_DATA_TYPE);
 227         }
 228
 229         if (list->startup == joydev->nabs + joydev->nkey
 230                 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
 231                         return -EAGAIN;
 232
 233         retval = wait_event_interruptible(list->joydev->wait,
 234                                           !list->joydev->exist ||
 235                                           list->startup < joydev->nabs + joydev->nkey ||
 236                                           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         void __user *argp = (void __user *)arg;
 295         int i, j;
 296
 297         if (!joydev->exist) return -ENODEV;
 298
 299         switch (cmd) {
 300
 301                 case JS_SET_CAL:
 302                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 303                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 304                 case JS_GET_CAL:
 305                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 306                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 307                 case JS_SET_TIMEOUT:
 308                         return get_user(joydev->glue.JS_TIMEOUT, (int __user *) arg);
 309                 case JS_GET_TIMEOUT:
 310                         return put_user(joydev->glue.JS_TIMEOUT, (int __user *) arg);
 311                 case JS_SET_TIMELIMIT:
 312                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 313                 case JS_GET_TIMELIMIT:
 314                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 315                 case JS_SET_ALL:
 316                         return copy_from_user(&joydev->glue, argp,
 317                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 318                 case JS_GET_ALL:
 319                         return copy_to_user(argp, &joydev->glue,
 320                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 321
 322                 case JSIOCGVERSION:
 323                         return put_user(JS_VERSION, (__u32 __user *) arg);
 324                 case JSIOCGAXES:
 325                         return put_user(joydev->nabs, (__u8 __user *) arg);
 326                 case JSIOCGBUTTONS:
 327                         return put_user(joydev->nkey, (__u8 __user *) arg);
 328                 case JSIOCSCORR:
 329                         if (copy_from_user(joydev->corr, argp,
 330                                       sizeof(struct js_corr) * joydev->nabs))
 331                             return -EFAULT;
 332                         for (i = 0; i < joydev->nabs; i++) {
 333                                 j = joydev->abspam[i];
 334                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 335                         }
 336                         return 0;
 337                 case JSIOCGCORR:
 338                         return copy_to_user(argp, joydev->corr,
 339                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 340                 case JSIOCSAXMAP:
 341                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * ABS_MAX))
 342                                 return -EFAULT;
 343                         for (i = 0; i < joydev->nabs; i++) {
 344                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
 345                                 joydev->absmap[joydev->abspam[i]] = i;
 346                         }
 347                         return 0;
 348                 case JSIOCGAXMAP:
 349                         return copy_to_user(argp, joydev->abspam,
 350                                                 sizeof(__u8) * ABS_MAX) ? -EFAULT : 0;
 351                 case JSIOCSBTNMAP:
 352                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC)))
 353                                 return -EFAULT;
 354                         for (i = 0; i < joydev->nkey; i++) {
 355                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
 356                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 357                         }
 358                         return 0;
 359                 case JSIOCGBTNMAP:
 360                         return copy_to_user(argp, joydev->keypam,
 361                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC)) ? -EFAULT : 0;
 362                 default:
 363                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 364                                 int len;
 365                                 if (!dev->name) return 0;
 366                                 len = strlen(dev->name) + 1;
 367                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 368                                 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
 369                                 return len;
 370                         }
 371         }
 372         return -EINVAL;
 373 }
 374
 375 static struct file_operations joydev_fops = {
 376         .owner =        THIS_MODULE,
 377         .read =         joydev_read,
 378         .write =        joydev_write,
 379         .poll =         joydev_poll,
 380         .open =         joydev_open,
 381         .release =      joydev_release,
 382         .ioctl =        joydev_ioctl,
 383         .fasync =       joydev_fasync,
 384 };
 385
 386 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 387 {
 388         struct joydev *joydev;
 389         int i, j, t, minor;
 390
 391         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 392         if (minor == JOYDEV_MINORS) {
 393                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 394                 return NULL;
 395         }
 396
 397         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
 398                 return NULL;
 399         memset(joydev, 0, sizeof(struct joydev));
 400
 401         INIT_LIST_HEAD(&joydev->list);
 402         init_waitqueue_head(&joydev->wait);
 403
 404         joydev->minor = minor;
 405         joydev->exist = 1;
 406         joydev->handle.dev = dev;
 407         joydev->handle.name = joydev->name;
 408         joydev->handle.handler = handler;
 409         joydev->handle.private = joydev;
 410         sprintf(joydev->name, "js%d", minor);
 411
 412         for (i = 0; i < ABS_MAX; i++)
 413                 if (test_bit(i, dev->absbit)) {
 414                         joydev->absmap[i] = joydev->nabs;
 415                         joydev->abspam[joydev->nabs] = i;
 416                         joydev->nabs++;
 417                 }
 418
 419         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC; i++)
 420                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 421                         joydev->keymap[i] = joydev->nkey;
 422                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 423                         joydev->nkey++;
 424                 }
 425
 426         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 427                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 428                         joydev->keymap[i] = joydev->nkey;
 429                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 430                         joydev->nkey++;
 431                 }
 432
 433         for (i = 0; i < joydev->nabs; i++) {
 434                 j = joydev->abspam[i];
 435                 if (dev->absmax[j] == dev->absmin[j]) {
 436                         joydev->corr[i].type = JS_CORR_NONE;
 437                         joydev->abs[i] = dev->abs[j];
 438                         continue;
 439                 }
 440                 joydev->corr[i].type = JS_CORR_BROKEN;
 441                 joydev->corr[i].prec = dev->absfuzz[j];
 442                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 443                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 444                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 445                         continue;
 446                 joydev->corr[i].coef[2] = (1 << 29) / t;
 447                 joydev->corr[i].coef[3] = (1 << 29) / t;
 448
 449                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 450         }
 451
 452         joydev_table[minor] = joydev;
 453
 454         devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 455                         S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
 456         class_simple_device_add(input_class,
 457                                 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 458                                 dev->dev, "js%d", minor);
 459
 460         return &joydev->handle;
 461 }
 462
 463 static void joydev_disconnect(struct input_handle *handle)
 464 {
 465         struct joydev *joydev = handle->private;
 466
 467         class_simple_device_remove(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 468         devfs_remove("input/js%d", joydev->minor);
 469         joydev->exist = 0;
 470
 471         if (joydev->open)
 472                 input_close_device(handle);
 473         else
 474                 joydev_free(joydev);
 475 }
 476
 477 static struct input_device_id joydev_blacklist[] = {
 478         {
 479                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 480                 .evbit = { BIT(EV_KEY) },
 481                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 482         },      /* Avoid itouchpads, touchscreens and tablets */
 483         { },    /* Terminating entry */
 484 };
 485
 486 static struct input_device_id joydev_ids[] = {
 487         {
 488                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 489                 .evbit = { BIT(EV_ABS) },
 490                 .absbit = { BIT(ABS_X) },
 491         },
 492         {
 493                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 494                 .evbit = { BIT(EV_ABS) },
 495                 .absbit = { BIT(ABS_WHEEL) },
 496         },
 497         {
 498                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 499                 .evbit = { BIT(EV_ABS) },
 500                 .absbit = { BIT(ABS_THROTTLE) },
 501         },
 502         { },    /* Terminating entry */
 503 };
 504
 505 MODULE_DEVICE_TABLE(input, joydev_ids);
 506
 507 static struct input_handler joydev_handler = {
 508         .event =        joydev_event,
 509         .connect =      joydev_connect,
 510         .disconnect =   joydev_disconnect,
 511         .fops =         &joydev_fops,
 512         .minor =        JOYDEV_MINOR_BASE,
 513         .name =         "joydev",
 514         .id_table =     joydev_ids,
 515         .blacklist =    joydev_blacklist,
 516 };
 517
 518 static int __init joydev_init(void)
 519 {
 520         input_register_handler(&joydev_handler);
 521         return 0;
 522 }
 523
 524 static void __exit joydev_exit(void)
 525 {
 526         input_unregister_handler(&joydev_handler);
 527 }
 528
 529 module_init(joydev_init);
 530 module_exit(joydev_exit);