drivers/usb/joydev.c

   1 /*
   2  *  joydev.c  Version 0.1
   3  *
   4  *  Copyright (c) 1999 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/malloc.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
  48 #define JOYDEV_MAJOR            15
  49 #define JOYDEV_BUFFER_SIZE      64
  50
  51 struct joydev {
  52         char name[32];
  53         int used;
  54         struct input_handle handle;
  55         int minor;
  56         wait_queue_head_t wait;
  57         struct joydev *next;
  58         struct joydev_list *list;
  59         struct js_corr corr[ABS_MAX];
  60         struct JS_DATA_SAVE_TYPE glue;
  61         int nabs;
  62         int nkey;
  63         __u16 keymap[KEY_MAX - BTN_MISC];
  64         __u16 keypam[KEY_MAX - BTN_MISC];
  65         __u8 absmap[ABS_MAX];
  66         __u8 abspam[ABS_MAX];
  67 };
  68
  69 struct joydev_list {
  70         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  71         int head;
  72         int tail;
  73         int startup;
  74         struct fasync_struct *fasync;
  75         struct joydev *joydev;
  76         struct joydev_list *next;
  77 };
  78
  79 static unsigned long joydev_minors = 0;
  80 static struct joydev *joydev_base[BITS_PER_LONG];
  81
  82 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
  83 MODULE_SUPPORTED_DEVICE("js");
  84
  85 static int joydev_correct(int value, struct js_corr *corr)
  86 {
  87         switch (corr->type) {
  88                 case JS_CORR_NONE:
  89                         break;
  90                 case JS_CORR_BROKEN:
  91                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  92                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  93                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  94                         break;
  95                 default:
  96                         return 0;
  97         }
  98
  99         if (value < -32767) return -32767;
 100         if (value >  32767) return  32767;
 101
 102         return value;
 103 }
 104
 105 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 106 {
 107         struct joydev *joydev = handle->private;
 108         struct joydev_list *list = joydev->list;
 109         struct js_event event;
 110
 111         switch (type) {
 112
 113                 case EV_KEY:
 114                         if (code < BTN_MISC || value == 2) return;
 115                         event.type = JS_EVENT_BUTTON;
 116                         event.number = joydev->keymap[code - BTN_MISC];
 117                         event.value = value;
 118                         break;
 119
 120                 case EV_ABS:
 121                         event.type = JS_EVENT_AXIS;
 122                         event.number = joydev->absmap[code];
 123                         event.value = joydev_correct(value, &joydev->corr[event.number]);
 124                         break;
 125
 126                 default:
 127                         return;
 128         }
 129
 130         event.time = jiffies * (1000 / HZ);
 131
 132         while (list) {
 133
 134                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
 135
 136                 if (list->startup == joydev->nabs + joydev->nkey)
 137                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 138                                 list->startup = 0;
 139
 140                 if (list->fasync)
 141                         kill_fasync(list->fasync, SIGIO, POLL_IN);
 142
 143                 list = list->next;
 144         }
 145
 146         wake_up_interruptible(&joydev->wait);
 147 }
 148
 149 static int joydev_fasync(int fd, struct file *file, int on)
 150 {
 151         int retval;
 152         struct joydev_list *list = file->private_data;
 153         retval = fasync_helper(fd, file, on, &list->fasync);
 154         return retval < 0 ? retval : 0;
 155 }
 156
 157 static int joydev_release(struct inode * inode, struct file * file)
 158 {
 159         struct joydev_list *list = file->private_data;
 160         struct joydev_list **listptr = &list->joydev->list;
 161
 162         joydev_fasync(-1, file, 0);
 163
 164         while (*listptr && (*listptr != list))
 165                 listptr = &((*listptr)->next);
 166         *listptr = (*listptr)->next;
 167
 168         if (!--list->joydev->used) {
 169                 clear_bit(list->joydev->minor, &joydev_minors);
 170                 kfree(list->joydev);
 171         }
 172
 173         kfree(list);
 174
 175         MOD_DEC_USE_COUNT;
 176         return 0;
 177 }
 178
 179 static int joydev_open(struct inode *inode, struct file *file)
 180 {
 181         struct joydev_list *list;
 182         int i = MINOR(inode->i_rdev);
 183
 184         if (MAJOR(inode->i_rdev) != JOYSTICK_MAJOR)
 185                 return -EINVAL;
 186
 187         if (i > BITS_PER_LONG || !test_bit(i, &joydev_minors))
 188                 return -ENODEV;
 189
 190         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 191                 return -ENOMEM;
 192
 193         memset(list, 0, sizeof(struct joydev_list));
 194
 195         list->joydev = joydev_base[i];
 196         list->next = joydev_base[i]->list;
 197         joydev_base[i]->list = list;
 198
 199         file->private_data = list;
 200
 201         list->joydev->used++;
 202
 203         MOD_INC_USE_COUNT;
 204         return 0;
 205 }
 206
 207 static ssize_t joydev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
 208 {
 209         return -EINVAL;
 210 }
 211
 212 static ssize_t joydev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
 213 {
 214         DECLARE_WAITQUEUE(wait, current);
 215         struct joydev_list *list = file->private_data;
 216         struct joydev *joydev = list->joydev;
 217         struct input_dev *input = joydev->handle.dev;
 218         int retval = 0;
 219
 220         if (count < sizeof(struct js_event))
 221                 return -EINVAL;
 222
 223         if (count == sizeof(struct JS_DATA_TYPE)) {
 224
 225                 struct JS_DATA_TYPE data;
 226
 227                 data.buttons =  (joydev->nkey > 0 && test_bit(joydev->keypam[0], input->key)) ? 1 : 0 |
 228                                 (joydev->nkey > 1 && test_bit(joydev->keypam[1], input->key)) ? 2 : 0;
 229                 data.x = ((joydev_correct(input->abs[ABS_X], &joydev->corr[0]) / 256) + 128) >> joydev->glue.JS_CORR.x;
 230                 data.y = ((joydev_correct(input->abs[ABS_Y], &joydev->corr[1]) / 256) + 128) >> joydev->glue.JS_CORR.y;
 231
 232                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 233                         return -EFAULT;
 234
 235                 list->startup = 0;
 236                 list->tail = list->head;
 237
 238                 return sizeof(struct JS_DATA_TYPE);
 239         }
 240
 241         if (list->head == list->tail && list->startup == joydev->nabs + joydev->nkey) {
 242
 243                 add_wait_queue(&list->joydev->wait, &wait);
 244                 current->state = TASK_INTERRUPTIBLE;
 245
 246                 while (list->head == list->tail) {
 247
 248                         if (file->f_flags & O_NONBLOCK) {
 249                                 retval = -EAGAIN;
 250                                 break;
 251                         }
 252                         if (signal_pending(current)) {
 253                                 retval = -ERESTARTSYS;
 254                                 break;
 255                         }
 256
 257                         schedule();
 258                 }
 259
 260                 current->state = TASK_RUNNING;
 261                 remove_wait_queue(&list->joydev->wait, &wait);
 262         }
 263
 264         if (retval)
 265                 return retval;
 266
 267         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 268
 269                 struct js_event event;
 270
 271                 event.time = jiffies * (1000/HZ);
 272
 273                 if (list->startup < joydev->nkey) {
 274                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 275                         event.value = !!test_bit(joydev->keypam[list->startup], input->key);
 276                         event.number = list->startup;
 277                 } else {
 278                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 279                         event.value = joydev_correct(input->abs[joydev->abspam[list->startup - joydev->nkey]],
 280                                                         &joydev->corr[list->startup - joydev->nkey]);
 281                         event.number = list->startup - joydev->nkey;
 282                 }
 283
 284                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 285                         return -EFAULT;
 286
 287                 list->startup++;
 288                 retval += sizeof(struct js_event);
 289         }
 290
 291         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
 292
 293                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
 294                         return -EFAULT;
 295
 296                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 297                 retval += sizeof(struct js_event);
 298         }
 299
 300         return retval;
 301 }
 302
 303 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 304 {
 305         struct joydev_list *list = file->private_data;
 306         poll_wait(file, &list->joydev->wait, wait);
 307         if (list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey)
 308                 return POLLIN | POLLRDNORM;
 309         return 0;
 310 }
 311
 312 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 313 {
 314         struct joydev_list *list = file->private_data;
 315         struct joydev *joydev = list->joydev;
 316
 317         switch (cmd) {
 318
 319                 case JS_SET_CAL:
 320                         return copy_from_user(&joydev->glue.JS_CORR, (struct JS_DATA_TYPE *) arg,
 321                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 322                 case JS_GET_CAL:
 323                         return copy_to_user((struct JS_DATA_TYPE *) arg, &joydev->glue.JS_CORR,
 324                                 sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
 325                 case JS_SET_TIMEOUT:
 326                         return get_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 327                 case JS_GET_TIMEOUT:
 328                         return put_user(joydev->glue.JS_TIMEOUT, (int *) arg);
 329                 case JS_SET_TIMELIMIT:
 330                         return get_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 331                 case JS_GET_TIMELIMIT:
 332                         return put_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
 333                 case JS_SET_ALL:
 334                         return copy_from_user(&joydev->glue, (struct JS_DATA_SAVE_TYPE *) arg,
 335                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 336                 case JS_GET_ALL:
 337                         return copy_to_user((struct JS_DATA_SAVE_TYPE *) arg, &joydev->glue,
 338                                                 sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
 339
 340                 case JSIOCGVERSION:
 341                         return put_user(JS_VERSION, (__u32 *) arg);
 342                 case JSIOCGAXES:
 343                         return put_user(joydev->nabs, (__u8 *) arg);
 344                 case JSIOCGBUTTONS:
 345                         return put_user(joydev->nkey, (__u8 *) arg);
 346                 case JSIOCSCORR:
 347                         return copy_from_user(joydev->corr, (struct js_corr *) arg,
 348                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 349                 case JSIOCGCORR:
 350                         return copy_to_user((struct js_corr *) arg, joydev->corr,
 351                                                 sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
 352                 default:
 353                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 354                                 int len = strlen(joydev->name) + 1;
 355                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 356                                 if (copy_to_user((char *) arg, joydev->name, len)) return -EFAULT;
 357                                 return len;
 358                         }
 359         }
 360         return -EINVAL;
 361 }
 362
 363 static struct file_operations joydev_fops = {
 364         read:           joydev_read,
 365         write:          joydev_write,
 366         poll:           joydev_poll,
 367         open:           joydev_open,
 368         release:        joydev_release,
 369         ioctl:          joydev_ioctl,
 370         fasync:         joydev_fasync,
 371 };
 372
 373 static int joydev_connect(struct input_handler *handler, struct input_dev *dev)
 374 {
 375         struct joydev *joydev;
 376         int i, j;
 377
 378         if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
 379               test_bit(ABS_X, dev->absbit) && test_bit(ABS_Y, dev->absbit) &&
 380              (test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
 381                 || test_bit(BTN_1, dev->keybit)))) return -1;
 382
 383         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
 384                 return -1;
 385
 386         memset(joydev, 0, sizeof(struct joydev));
 387
 388         init_waitqueue_head(&joydev->wait);
 389
 390         if (joydev_minors == -1) {
 391                 printk("Can't register new joystick - 32 devices already taken.\n");
 392                 return -1;
 393         }
 394
 395         sprintf(joydev->name, "joydev%d", joydev->minor);
 396
 397         joydev->handle.dev = dev;
 398         joydev->handle.handler = handler;
 399         joydev->handle.private = joydev;
 400
 401         joydev->used = 1;
 402
 403         for (i = 0; i < ABS_MAX; i++)
 404                 if (test_bit(i, dev->absbit)) {
 405                         joydev->absmap[i] = joydev->nabs;
 406                         joydev->abspam[joydev->nabs] = i;
 407                         joydev->nabs++;
 408                 }
 409
 410         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC; i++)
 411                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 412                         joydev->keymap[i] = joydev->nkey;
 413                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 414                         joydev->nkey++;
 415                 }
 416
 417         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 418                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 419                         joydev->keymap[i] = joydev->nkey;
 420                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 421                         joydev->nkey++;
 422                 }
 423
 424         joydev->minor = ffz(joydev_minors);
 425         set_bit(joydev->minor, &joydev_minors);
 426         joydev_base[joydev->minor] = joydev;
 427
 428         for (i = 0; i < joydev->nabs; i++) {
 429                 j = joydev->abspam[i];
 430                 if (dev->absmax[j] == dev->absmin[j]) {
 431                         joydev->corr[i].type = JS_CORR_NONE;
 432                         continue;
 433                 }
 434                 joydev->corr[i].type = JS_CORR_BROKEN;
 435                 joydev->corr[i].prec = dev->absfuzz[j];
 436                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 437                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 438                 joydev->corr[i].coef[2] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
 439                 joydev->corr[i].coef[3] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
 440         }
 441
 442         input_open_device(&joydev->handle);
 443
 444         printk("%s: Joystick device for input%d on /dev/js%d\n", joydev->name, dev->number, joydev->minor);
 445
 446         return 0;
 447 }
 448
 449 static void joydev_disconnect(struct input_handle *handle)
 450 {
 451         struct joydev *joydev = handle->private;
 452
 453         input_close_device(handle);
 454
 455         if (!--joydev->used) {
 456                 clear_bit(joydev->minor, &joydev_minors);
 457                 kfree(joydev);
 458         }
 459 }
 460
 461 static struct input_handler joydev_handler = {
 462         event:          joydev_event,
 463         connect:        joydev_connect,
 464         disconnect:     joydev_disconnect,
 465 };
 466
 467 static int __init joydev_init(void)
 468 {
 469         if (register_chrdev(JOYDEV_MAJOR, "js", &joydev_fops)) {
 470                 printk(KERN_ERR "joydev: unable to get major %d for joystick\n", JOYDEV_MAJOR);
 471                 return -EBUSY;
 472         }
 473         input_register_handler(&joydev_handler);
 474         return 0;
 475 }
 476
 477 static void __exit joydev_exit(void)
 478 {
 479         input_unregister_handler(&joydev_handler);
 480         if (unregister_chrdev(JOYSTICK_MAJOR, "js"))
 481                 printk(KERN_ERR "js: can't unregister device\n");
 482 }
 483
 484 module_init(joydev_init);
 485 module_exit(joydev_exit);