drivers/input/joydev.c

   1 /*
   2  * $Id: joydev.c,v 1.19 2001/01/10 19:49:40 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2000 Vojtech Pavlik
   5  *  Copyright (c) 1999 Colin Van Dyke
   6  *
   7  *  Joystick device driver for the input driver suite.
   8  *
   9  *  Sponsored by SuSE and Intel
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
  29  * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <asm/io.h>
  33 #include <asm/system.h>
  34 #include <asm/segment.h>
  35 #include <linux/delay.h>
  36 #include <linux/errno.h>
  37 #include <linux/joystick.h>
  38 #include <linux/input.h>
  39 #include <linux/kernel.h>
  40 #include <linux/major.h>
  41 #include <linux/slab.h>
  42 #include <linux/mm.h>
  43 #include <linux/miscdevice.h>
  44 #include <linux/module.h>
  45 #include <linux/poll.h>
  46 #include <linux/init.h>
  47 #include <linux/smp_lock.h>
  48
  49 #define JOYDEV_MINOR_BASE       0
  50 #define JOYDEV_MINORS           32
  51 #define JOYDEV_BUFFER_SIZE      64
  52
  53 #define MSECS(t)        (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
  54
  55 struct joydev {
  56         int exist;
  57         int open;
  58         int minor;
  59         struct input_handle handle;
  60         wait_queue_head_t wait;
  61         devfs_handle_t devfs;
  62         struct joydev *next;
  63         struct joydev_list *list;
  64         struct js_corr corr[ABS_MAX];
  65         struct JS_DATA_SAVE_TYPE glue;
  66         int nabs;
  67         int nkey;
  68         __u16 keymap[KEY_MAX - BTN_MISC];
  69         __u16 keypam[KEY_MAX - BTN_MISC];
  70         __u8 absmap[ABS_MAX];
  71         __u8 abspam[ABS_MAX];
  72         __s16 abs[ABS_MAX];
  73 };
  74
  75 struct joydev_list {
  76         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  77         int head;
  78         int tail;
  79         int startup;
  80         struct fasync_struct *fasync;
  81         struct joydev *joydev;
  82         struct joydev_list *next;
  83 };
  84
  85 static struct joydev *joydev_table[JOYDEV_MINORS];
  86
  87 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  88 MODULE_DESCRIPTION("Joystick device driver");
  89 MODULE_LICENSE("GPL");
  90 MODULE_SUPPORTED_DEVICE("input/js");
  91
  92 static int joydev_correct(int value, struct js_corr *corr)
  93 {
  94         switch (corr->type) {
  95                 case JS_CORR_NONE:
  96                         break;
  97                 case JS_CORR_BROKEN:
  98                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  99                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
 100                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
 101                         break;
 102                 default:
 103                         return 0;
 104         }
 105
 106         if (value < -32767) return -32767;
 107         if (value >  32767) return  32767;
 108
 109         return value;
 110 }
 111
 112 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 113 {
 114         struct joydev *joydev = handle->private;
 115         struct joydev_list *list = joydev->list;
 116         struct js_event event;
 117
 118         switch (type) {
 119
 120                 case EV_KEY:
 121                         if (code < BTN_MISC || value == 2) return;
 122                         event.type = JS_EVENT_BUTTON;
 123                         event.number = joydev->keymap[code - BTN_MISC];
 124                         event.value = value;
 125                         break;
 126
 127                 case EV_ABS:
 128                         event.type = JS_EVENT_AXIS;
 129                         event.number = joydev->absmap[code];
 130                         event.value = joydev_correct(value, joydev->corr + event.number);
 131                         if (event.value == joydev->abs[event.number]) return;
 132                         joydev->abs[event.number] = event.value;
 133                         break;
 134
 135                 default:
 136                         return;
 137         }
 138
 139         event.time = MSECS(jiffies);
 140
 141         while (list) {
 142
 143                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
 144
 145                 if (list->startup == joydev->nabs + joydev->nkey)
 146                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 147                                 list->startup = 0;
 148
 149                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
 150
 151                 list = list->next;
 152         }
 153
 154         wake_up_interruptible(&joydev->wait);
 155 }
 156
 157 static int joydev_fasync(int fd, struct file *file, int on)
 158 {
 159         int retval;
 160         struct joydev_list *list = file->private_data;
 161         retval = fasync_helper(fd, file, on, &list->fasync);
 162         return retval < 0 ? retval : 0;
 163 }
 164
 165 static int joydev_release(struct inode * inode, struct file * file)
 166 {
 167         struct joydev_list *list = file->private_data;
 168         struct joydev_list **listptr;
 169
 170         lock_kernel();
 171         listptr = &list->joydev->list;
 172         joydev_fasync(-1, file, 0);
 173
 174         while (*listptr && (*listptr != list))
 175                 listptr = &((*listptr)->next);
 176         *listptr = (*listptr)->next;
 177
 178         if (!--list->joydev->open) {
 179                 if (list->joydev->exist) {
 180                         input_close_device(&list->joydev->handle);
 181                 } else {
 182                         input_unregister_minor(list->joydev->devfs);
 183                         joydev_table[list->joydev->minor] = NULL;
 184                         kfree(list->joydev);
 185                 }
 186         }
 187
 188         kfree(list);
 189         unlock_kernel();
 190
 191         return 0;
 192 }
 193
 194 static int joydev_open(struct inode *inode, struct file *file)
 195 {
 196         struct joydev_list *list;
 197         int i = MINOR(inode->i_rdev) - JOYDEV_MINOR_BASE;
 198
 199         if (i >= JOYDEV_MINORS || !joydev_table[i])
 200                 return -ENODEV;
 201
 202         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 203                 return -ENOMEM;
 204         memset(list, 0, sizeof(struct joydev_list));
 205
 206         list->joydev = joydev_table[i];
 207         list->next = joydev_table[i]->list;
 208         joydev_table[i]->list = list;
 209
 210         file->private_data = list;
 211
 212         if (!list->joydev->open++)
 213                 if (list->joydev->exist)
 214                         input_open_device(&list->joydev->handle);
 215
 216         return 0;
 217 }
 218
 219 static ssize_t joydev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
 220 {
 221         return -EINVAL;
 222 }
 223
 224 static ssize_t joydev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
 225 {
 226         DECLARE_WAITQUEUE(wait, current);
 227         struct joydev_list *list = file->private_data;
 228         struct joydev *joydev = list->joydev;
 229         struct input_dev *input = joydev->handle.dev;
 230         int retval = 0;
 231
 232         if (count < sizeof(struct js_event))
 233                 return -EINVAL;
 234
 235         if (!joydev->exist)
 236                 return -ENODEV;
 237
 238         if (count == sizeof(struct JS_DATA_TYPE)) {
 239
 240                 struct JS_DATA_TYPE data;
 241                 int i;
 242
 243                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 244                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 245                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 246                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 247
 248                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 249                         return -EFAULT;
 250
 251                 list->startup = 0;
 252                 list->tail = list->head;
 253
 254                 return sizeof(struct JS_DATA_TYPE);
 255         }
 256
 257         if (list->head == list->tail && list->startup == joydev->nabs + joydev->nkey) {
 258
 259                 add_wait_queue(&list->joydev->wait, &wait);
 260                 current->state = TASK_INTERRUPTIBLE;
 261
 262                 while (list->head == list->tail) {
 263
 264                         if (!joydev->exist) {
 265                                 retval = -ENODEV;
 266                                 break;
 267                         }
 268                         if (file->f_flags & O_NONBLOCK) {
 269                                 retval = -EAGAIN;
 270                                 break;
 271                         }
 272                         if (signal_pending(current)) {
 273                                 retval = -ERESTARTSYS;
 274                                 break;
 275                         }
 276
 277                         schedule();
 278                 }
 279
 280                 current->state = TASK_RUNNING;
 281                 remove_wait_queue(&list->joydev->wait, &wait);
 282         }
 283
 284         if (retval)
 285                 return retval;
 286
 287         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 288
 289                 struct js_event event;
 290
 291                 event.time = MSECS(jiffies);
 292
 293                 if (list->startup < joydev->nkey) {
 294                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 295                         event.number = list->startup;
 296                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 297                 } else {
 298                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 299                         event.number = list->startup - joydev->nkey;
 300                         event.value = joydev->abs[event.number];
 301                 }
 302
 303                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 304                         return -EFAULT;
 305
 306                 list->startup++;
 307                 retval += sizeof(struct js_event);
 308         }
 309
 310         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
 311
 312                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
 313                         return -EFAULT;
 314
 315                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 316                 retval += sizeof(struct js_event);
 317         }
 318
 319         return retval;
 320 }
 321
 322 /* No kernel lock - fine */
 323 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 324 {
 325         struct joydev_list *list = file->private_data;
 326         poll_wait(file, &list->joydev->wait, wait);
 327         if (list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey)
 328                 return POLLIN | POLLRDNORM;
 329         return 0;
 330 }
 331
 332 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 333 {
 334         struct joydev_list *list = file->private_data;
 335         struct joydev *joydev = list->joydev;
 336         struct input_dev *dev = joydev->handle.dev;
 337         int i;
 338
 339         if (!joydev->exist)
 340                 return -ENODEV;
 341
 342         switch (cmd) {
 343
 344                 case JS_SET_CAL:
 345                         return copy_from_user(&joydev->glue.JS_CORR, (struct JS_DATA_TYPE *) arg,
 346                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 347                 case JS_GET_CAL:
 348                         return copy_to_user((struct JS_DATA_TYPE *) arg, &joydev->glue.JS_CORR,
 349                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 350                 case JS_SET_TIMEOUT:
 351                         return get_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 352                 case JS_GET_TIMEOUT:
 353                         return put_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 354                 case JS_SET_TIMELIMIT:
 355                         return get_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 356                 case JS_GET_TIMELIMIT:
 357                         return put_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 358                 case JS_SET_ALL:
 359                         return copy_from_user(&joydev->glue, (struct JS_DATA_SAVE_TYPE *) arg,
 360                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 361                 case JS_GET_ALL:
 362                         return copy_to_user((struct JS_DATA_SAVE_TYPE *) arg, &joydev->glue,
 363                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 364
 365                 case JSIOCGVERSION:
 366                         return put_user(JS_VERSION, (__u32 *) arg);
 367                 case JSIOCGAXES:
 368                         return put_user(joydev->nabs, (__u8 *) arg);
 369                 case JSIOCGBUTTONS:
 370                         return put_user(joydev->nkey, (__u8 *) arg);
 371                 case JSIOCSCORR:
 372                         return copy_from_user(joydev->corr, (struct js_corr *) arg,
 373                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 374                 case JSIOCGCORR:
 375                         return copy_to_user((struct js_corr *) arg, joydev->corr,
 376                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 377                 case JSIOCSAXMAP:
 378                         if (copy_from_user(joydev->abspam, (__u8 *) arg, sizeof(__u8) * ABS_MAX))
 379                                 return -EFAULT;
 380                         for (i = 0; i < joydev->nabs; i++) {
 381                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
 382                                 joydev->absmap[joydev->abspam[i]] = i;
 383                         }
 384                         return 0;
 385                 case JSIOCGAXMAP:
 386                         return copy_to_user((__u8 *) arg, joydev->abspam,
 387                                                 sizeof(__u8) * ABS_MAX) ? -EFAULT : 0;
 388                 case JSIOCSBTNMAP:
 389                         if (copy_from_user(joydev->keypam, (__u16 *) arg, sizeof(__u16) * (KEY_MAX - BTN_MISC)))
 390                                 return -EFAULT;
 391                         for (i = 0; i < joydev->nkey; i++) {
 392                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
 393                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 394                         }
 395                         return 0;
 396                 case JSIOCGBTNMAP:
 397                         return copy_to_user((__u16 *) arg, joydev->keypam,
 398                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC)) ? -EFAULT : 0;
 399                 default:
 400                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 401                                 int len;
 402                                 if (!dev->name) return 0;
 403                                 len = strlen(dev->name) + 1;
 404                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 405                                 if (copy_to_user((char *) arg, dev->name, len)) return -EFAULT;
 406                                 return len;
 407                         }
 408         }
 409         return -EINVAL;
 410 }
 411
 412 static struct file_operations joydev_fops = {
 413         owner:          THIS_MODULE,
 414         read:           joydev_read,
 415         write:          joydev_write,
 416         poll:           joydev_poll,
 417         open:           joydev_open,
 418         release:        joydev_release,
 419         ioctl:          joydev_ioctl,
 420         fasync:         joydev_fasync,
 421 };
 422
 423 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev)
 424 {
 425         struct joydev *joydev;
 426         int i, j, t, minor;
 427
 428         if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
 429              (test_bit(ABS_X, dev->absbit) || test_bit(ABS_Y, dev->absbit)) &&
 430              (test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
 431                 || test_bit(BTN_1, dev->keybit)))) return NULL;
 432
 433         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 434         if (minor == JOYDEV_MINORS) {
 435                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 436                 return NULL;
 437         }
 438
 439         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
 440                 return NULL;
 441         memset(joydev, 0, sizeof(struct joydev));
 442
 443         init_waitqueue_head(&joydev->wait);
 444
 445         joydev->minor = minor;
 446         joydev_table[minor] = joydev;
 447
 448         joydev->handle.dev = dev;
 449         joydev->handle.handler = handler;
 450         joydev->handle.private = joydev;
 451
 452         joydev->exist = 1;
 453
 454         for (i = 0; i < ABS_MAX; i++)
 455                 if (test_bit(i, dev->absbit)) {
 456                         joydev->absmap[i] = joydev->nabs;
 457                         joydev->abspam[joydev->nabs] = i;
 458                         joydev->nabs++;
 459                 }
 460
 461         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC; i++)
 462                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 463                         joydev->keymap[i] = joydev->nkey;
 464                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 465                         joydev->nkey++;
 466                 }
 467
 468         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 469                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 470                         joydev->keymap[i] = joydev->nkey;
 471                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 472                         joydev->nkey++;
 473                 }
 474
 475         for (i = 0; i < joydev->nabs; i++) {
 476                 j = joydev->abspam[i];
 477                 if (dev->absmax[j] == dev->absmin[j]) {
 478                         joydev->corr[i].type = JS_CORR_NONE;
 479                         continue;
 480                 }
 481                 joydev->corr[i].type = JS_CORR_BROKEN;
 482                 joydev->corr[i].prec = dev->absfuzz[j];
 483                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 484                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 485                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 486                         continue;
 487                 joydev->corr[i].coef[2] = (1 << 29) / t;
 488                 joydev->corr[i].coef[3] = (1 << 29) / t;
 489
 490                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 491         }
 492
 493         joydev->devfs = input_register_minor("js%d", minor, JOYDEV_MINOR_BASE);
 494
 495 //      printk(KERN_INFO "js%d: Joystick device for input%d\n", minor, dev->number);
 496
 497         return &joydev->handle;
 498 }
 499
 500 static void joydev_disconnect(struct input_handle *handle)
 501 {
 502         struct joydev *joydev = handle->private;
 503
 504         joydev->exist = 0;
 505
 506         if (joydev->open) {
 507                 input_close_device(handle);
 508         } else {
 509                 input_unregister_minor(joydev->devfs);
 510                 joydev_table[joydev->minor] = NULL;
 511                 kfree(joydev);
 512         }
 513 }
 514
 515 static struct input_handler joydev_handler = {
 516         event:          joydev_event,
 517         connect:        joydev_connect,
 518         disconnect:     joydev_disconnect,
 519         fops:           &joydev_fops,
 520         minor:          JOYDEV_MINOR_BASE,
 521 };
 522
 523 static int __init joydev_init(void)
 524 {
 525         input_register_handler(&joydev_handler);
 526         return 0;
 527 }
 528
 529 static void __exit joydev_exit(void)
 530 {
 531         input_unregister_handler(&joydev_handler);
 532 }
 533
 534 module_init(joydev_init);
 535 module_exit(joydev_exit);