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 30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 31 MODULE_DESCRIPTION("Joystick device interfaces"); 32 MODULE_SUPPORTED_DEVICE("input/js"); 33 MODULE_LICENSE("GPL"); 34 35 #define JOYDEV_MINOR_BASE 0 36 #define JOYDEV_MINORS 16 37 #define JOYDEV_BUFFER_SIZE 64 38 39 struct joydev { 40 int exist; 41 int open; 42 int minor; 43 char name[16]; 44 struct input_handle handle; 45 wait_queue_head_t wait; 46 struct list_head list; 47 struct js_corr corr[ABS_MAX + 1]; 48 struct JS_DATA_SAVE_TYPE glue; 49 int nabs; 50 int nkey; 51 __u16 keymap[KEY_MAX - BTN_MISC + 1]; 52 __u16 keypam[KEY_MAX - BTN_MISC + 1]; 53 __u8 absmap[ABS_MAX + 1]; 54 __u8 abspam[ABS_MAX + 1]; 55 __s16 abs[ABS_MAX + 1]; 56 }; 57 58 struct joydev_list { 59 struct js_event buffer[JOYDEV_BUFFER_SIZE]; 60 int head; 61 int tail; 62 int startup; 63 struct fasync_struct *fasync; 64 struct joydev *joydev; 65 struct list_head node; 66 }; 67 68 static struct joydev *joydev_table[JOYDEV_MINORS]; 69 70 static int joydev_correct(int value, struct js_corr *corr) 71 { 72 switch (corr->type) { 73 case JS_CORR_NONE: 74 break; 75 case JS_CORR_BROKEN: 76 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : 77 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : 78 ((corr->coef[2] * (value - corr->coef[0])) >> 14); 79 break; 80 default: 81 return 0; 82 } 83 84 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); 85 } 86 87 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 88 { 89 struct joydev *joydev = handle->private; 90 struct joydev_list *list; 91 struct js_event event; 92 93 switch (type) { 94 95 case EV_KEY: 96 if (code < BTN_MISC || value == 2) 97 return; 98 event.type = JS_EVENT_BUTTON; 99 event.number = joydev->keymap[code - BTN_MISC]; 100 event.value = value; 101 break; 102 103 case EV_ABS: 104 event.type = JS_EVENT_AXIS; 105 event.number = joydev->absmap[code]; 106 event.value = joydev_correct(value, joydev->corr + event.number); 107 if (event.value == joydev->abs[event.number]) 108 return; 109 joydev->abs[event.number] = event.value; 110 break; 111 112 default: 113 return; 114 } 115 116 event.time = jiffies_to_msecs(jiffies); 117 118 list_for_each_entry(list, &joydev->list, node) { 119 120 memcpy(list->buffer + list->head, &event, sizeof(struct js_event)); 121 122 if (list->startup == joydev->nabs + joydev->nkey) 123 if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1))) 124 list->startup = 0; 125 126 kill_fasync(&list->fasync, SIGIO, POLL_IN); 127 } 128 129 wake_up_interruptible(&joydev->wait); 130 } 131 132 static int joydev_fasync(int fd, struct file *file, int on) 133 { 134 int retval; 135 struct joydev_list *list = file->private_data; 136 137 retval = fasync_helper(fd, file, on, &list->fasync); 138 139 return retval < 0 ? retval : 0; 140 } 141 142 static void joydev_free(struct joydev *joydev) 143 { 144 joydev_table[joydev->minor] = NULL; 145 kfree(joydev); 146 } 147 148 static int joydev_release(struct inode * inode, struct file * file) 149 { 150 struct joydev_list *list = file->private_data; 151 152 joydev_fasync(-1, file, 0); 153 154 list_del(&list->node); 155 156 if (!--list->joydev->open) { 157 if (list->joydev->exist) 158 input_close_device(&list->joydev->handle); 159 else 160 joydev_free(list->joydev); 161 } 162 163 kfree(list); 164 return 0; 165 } 166 167 static int joydev_open(struct inode *inode, struct file *file) 168 { 169 struct joydev_list *list; 170 int i = iminor(inode) - JOYDEV_MINOR_BASE; 171 172 if (i >= JOYDEV_MINORS || !joydev_table[i]) 173 return -ENODEV; 174 175 if (!(list = kzalloc(sizeof(struct joydev_list), GFP_KERNEL))) 176 return -ENOMEM; 177 178 list->joydev = joydev_table[i]; 179 list_add_tail(&list->node, &joydev_table[i]->list); 180 file->private_data = list; 181 182 if (!list->joydev->open++) 183 if (list->joydev->exist) 184 input_open_device(&list->joydev->handle); 185 186 return 0; 187 } 188 189 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 190 { 191 return -EINVAL; 192 } 193 194 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 195 { 196 struct joydev_list *list = file->private_data; 197 struct joydev *joydev = list->joydev; 198 struct input_dev *input = joydev->handle.dev; 199 int retval = 0; 200 201 if (!list->joydev->exist) 202 return -ENODEV; 203 204 if (count < sizeof(struct js_event)) 205 return -EINVAL; 206 207 if (count == sizeof(struct JS_DATA_TYPE)) { 208 209 struct JS_DATA_TYPE data; 210 int i; 211 212 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) 213 data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; 214 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; 215 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; 216 217 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) 218 return -EFAULT; 219 220 list->startup = 0; 221 list->tail = list->head; 222 223 return sizeof(struct JS_DATA_TYPE); 224 } 225 226 if (list->startup == joydev->nabs + joydev->nkey && 227 list->head == list->tail && (file->f_flags & O_NONBLOCK)) 228 return -EAGAIN; 229 230 retval = wait_event_interruptible(list->joydev->wait, 231 !list->joydev->exist || 232 list->startup < joydev->nabs + joydev->nkey || 233 list->head != list->tail); 234 235 if (retval) 236 return retval; 237 238 if (!list->joydev->exist) 239 return -ENODEV; 240 241 while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) { 242 243 struct js_event event; 244 245 event.time = jiffies_to_msecs(jiffies); 246 247 if (list->startup < joydev->nkey) { 248 event.type = JS_EVENT_BUTTON | JS_EVENT_INIT; 249 event.number = list->startup; 250 event.value = !!test_bit(joydev->keypam[event.number], input->key); 251 } else { 252 event.type = JS_EVENT_AXIS | JS_EVENT_INIT; 253 event.number = list->startup - joydev->nkey; 254 event.value = joydev->abs[event.number]; 255 } 256 257 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 258 return -EFAULT; 259 260 list->startup++; 261 retval += sizeof(struct js_event); 262 } 263 264 while (list->head != list->tail && retval + sizeof(struct js_event) <= count) { 265 266 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event))) 267 return -EFAULT; 268 269 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1); 270 retval += sizeof(struct js_event); 271 } 272 273 return retval; 274 } 275 276 /* No kernel lock - fine */ 277 static unsigned int joydev_poll(struct file *file, poll_table *wait) 278 { 279 struct joydev_list *list = file->private_data; 280 281 poll_wait(file, &list->joydev->wait, wait); 282 return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? 283 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR)); 284 } 285 286 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp) 287 { 288 struct input_dev *dev = joydev->handle.dev; 289 int i, j; 290 291 switch (cmd) { 292 293 case JS_SET_CAL: 294 return copy_from_user(&joydev->glue.JS_CORR, argp, 295 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 296 297 case JS_GET_CAL: 298 return copy_to_user(argp, &joydev->glue.JS_CORR, 299 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 300 301 case JS_SET_TIMEOUT: 302 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 303 304 case JS_GET_TIMEOUT: 305 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 306 307 case JSIOCGVERSION: 308 return put_user(JS_VERSION, (__u32 __user *) argp); 309 310 case JSIOCGAXES: 311 return put_user(joydev->nabs, (__u8 __user *) argp); 312 313 case JSIOCGBUTTONS: 314 return put_user(joydev->nkey, (__u8 __user *) argp); 315 316 case JSIOCSCORR: 317 if (copy_from_user(joydev->corr, argp, 318 sizeof(joydev->corr[0]) * joydev->nabs)) 319 return -EFAULT; 320 for (i = 0; i < joydev->nabs; i++) { 321 j = joydev->abspam[i]; 322 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); 323 } 324 return 0; 325 326 case JSIOCGCORR: 327 return copy_to_user(argp, joydev->corr, 328 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 329 330 case JSIOCSAXMAP: 331 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1))) 332 return -EFAULT; 333 for (i = 0; i < joydev->nabs; i++) { 334 if (joydev->abspam[i] > ABS_MAX) 335 return -EINVAL; 336 joydev->absmap[joydev->abspam[i]] = i; 337 } 338 return 0; 339 340 case JSIOCGAXMAP: 341 return copy_to_user(argp, joydev->abspam, 342 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0; 343 344 case JSIOCSBTNMAP: 345 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1))) 346 return -EFAULT; 347 for (i = 0; i < joydev->nkey; i++) { 348 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) 349 return -EINVAL; 350 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; 351 } 352 return 0; 353 354 case JSIOCGBTNMAP: 355 return copy_to_user(argp, joydev->keypam, 356 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0; 357 358 default: 359 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) { 360 int len; 361 if (!dev->name) 362 return 0; 363 len = strlen(dev->name) + 1; 364 if (len > _IOC_SIZE(cmd)) 365 len = _IOC_SIZE(cmd); 366 if (copy_to_user(argp, dev->name, len)) 367 return -EFAULT; 368 return len; 369 } 370 } 371 return -EINVAL; 372 } 373 374 #ifdef CONFIG_COMPAT 375 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 376 { 377 struct joydev_list *list = file->private_data; 378 struct joydev *joydev = list->joydev; 379 void __user *argp = (void __user *)arg; 380 s32 tmp32; 381 struct JS_DATA_SAVE_TYPE_32 ds32; 382 int err; 383 384 if (!joydev->exist) 385 return -ENODEV; 386 387 switch(cmd) { 388 case JS_SET_TIMELIMIT: 389 err = get_user(tmp32, (s32 __user *) arg); 390 if (err == 0) 391 joydev->glue.JS_TIMELIMIT = tmp32; 392 break; 393 case JS_GET_TIMELIMIT: 394 tmp32 = joydev->glue.JS_TIMELIMIT; 395 err = put_user(tmp32, (s32 __user *) arg); 396 break; 397 398 case JS_SET_ALL: 399 err = copy_from_user(&ds32, argp, 400 sizeof(ds32)) ? -EFAULT : 0; 401 if (err == 0) { 402 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 403 joydev->glue.BUSY = ds32.BUSY; 404 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 405 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 406 joydev->glue.JS_SAVE = ds32.JS_SAVE; 407 joydev->glue.JS_CORR = ds32.JS_CORR; 408 } 409 break; 410 411 case JS_GET_ALL: 412 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 413 ds32.BUSY = joydev->glue.BUSY; 414 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 415 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 416 ds32.JS_SAVE = joydev->glue.JS_SAVE; 417 ds32.JS_CORR = joydev->glue.JS_CORR; 418 419 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; 420 break; 421 422 default: 423 err = joydev_ioctl_common(joydev, cmd, argp); 424 } 425 return err; 426 } 427 #endif /* CONFIG_COMPAT */ 428 429 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 430 { 431 struct joydev_list *list = file->private_data; 432 struct joydev *joydev = list->joydev; 433 void __user *argp = (void __user *)arg; 434 435 if (!joydev->exist) 436 return -ENODEV; 437 438 switch(cmd) { 439 case JS_SET_TIMELIMIT: 440 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); 441 case JS_GET_TIMELIMIT: 442 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); 443 case JS_SET_ALL: 444 return copy_from_user(&joydev->glue, argp, 445 sizeof(joydev->glue)) ? -EFAULT : 0; 446 case JS_GET_ALL: 447 return copy_to_user(argp, &joydev->glue, 448 sizeof(joydev->glue)) ? -EFAULT : 0; 449 default: 450 return joydev_ioctl_common(joydev, cmd, argp); 451 } 452 } 453 454 static struct file_operations joydev_fops = { 455 .owner = THIS_MODULE, 456 .read = joydev_read, 457 .write = joydev_write, 458 .poll = joydev_poll, 459 .open = joydev_open, 460 .release = joydev_release, 461 .ioctl = joydev_ioctl, 462 #ifdef CONFIG_COMPAT 463 .compat_ioctl = joydev_compat_ioctl, 464 #endif 465 .fasync = joydev_fasync, 466 }; 467 468 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) 469 { 470 struct joydev *joydev; 471 struct class_device *cdev; 472 int i, j, t, minor; 473 474 for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++); 475 if (minor == JOYDEV_MINORS) { 476 printk(KERN_ERR "joydev: no more free joydev devices\n"); 477 return NULL; 478 } 479 480 if (!(joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL))) 481 return NULL; 482 483 INIT_LIST_HEAD(&joydev->list); 484 init_waitqueue_head(&joydev->wait); 485 486 joydev->minor = minor; 487 joydev->exist = 1; 488 joydev->handle.dev = dev; 489 joydev->handle.name = joydev->name; 490 joydev->handle.handler = handler; 491 joydev->handle.private = joydev; 492 sprintf(joydev->name, "js%d", minor); 493 494 for (i = 0; i < ABS_MAX + 1; i++) 495 if (test_bit(i, dev->absbit)) { 496 joydev->absmap[i] = joydev->nabs; 497 joydev->abspam[joydev->nabs] = i; 498 joydev->nabs++; 499 } 500 501 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 502 if (test_bit(i + BTN_MISC, dev->keybit)) { 503 joydev->keymap[i] = joydev->nkey; 504 joydev->keypam[joydev->nkey] = i + BTN_MISC; 505 joydev->nkey++; 506 } 507 508 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 509 if (test_bit(i + BTN_MISC, dev->keybit)) { 510 joydev->keymap[i] = joydev->nkey; 511 joydev->keypam[joydev->nkey] = i + BTN_MISC; 512 joydev->nkey++; 513 } 514 515 for (i = 0; i < joydev->nabs; i++) { 516 j = joydev->abspam[i]; 517 if (dev->absmax[j] == dev->absmin[j]) { 518 joydev->corr[i].type = JS_CORR_NONE; 519 joydev->abs[i] = dev->abs[j]; 520 continue; 521 } 522 joydev->corr[i].type = JS_CORR_BROKEN; 523 joydev->corr[i].prec = dev->absfuzz[j]; 524 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; 525 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; 526 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]))) 527 continue; 528 joydev->corr[i].coef[2] = (1 << 29) / t; 529 joydev->corr[i].coef[3] = (1 << 29) / t; 530 531 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); 532 } 533 534 joydev_table[minor] = joydev; 535 536 cdev = class_device_create(&input_class, &dev->cdev, 537 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), 538 dev->cdev.dev, joydev->name); 539 540 /* temporary symlink to keep userspace happy */ 541 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, 542 joydev->name); 543 544 return &joydev->handle; 545 } 546 547 static void joydev_disconnect(struct input_handle *handle) 548 { 549 struct joydev *joydev = handle->private; 550 struct joydev_list *list; 551 552 sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name); 553 class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor)); 554 joydev->exist = 0; 555 556 if (joydev->open) { 557 input_close_device(handle); 558 wake_up_interruptible(&joydev->wait); 559 list_for_each_entry(list, &joydev->list, node) 560 kill_fasync(&list->fasync, SIGIO, POLL_HUP); 561 } else 562 joydev_free(joydev); 563 } 564 565 static struct input_device_id joydev_blacklist[] = { 566 { 567 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, 568 .evbit = { BIT(EV_KEY) }, 569 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, 570 }, /* Avoid itouchpads, touchscreens and tablets */ 571 { } /* Terminating entry */ 572 }; 573 574 static struct input_device_id joydev_ids[] = { 575 { 576 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 577 .evbit = { BIT(EV_ABS) }, 578 .absbit = { BIT(ABS_X) }, 579 }, 580 { 581 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 582 .evbit = { BIT(EV_ABS) }, 583 .absbit = { BIT(ABS_WHEEL) }, 584 }, 585 { 586 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 587 .evbit = { BIT(EV_ABS) }, 588 .absbit = { BIT(ABS_THROTTLE) }, 589 }, 590 { } /* Terminating entry */ 591 }; 592 593 MODULE_DEVICE_TABLE(input, joydev_ids); 594 595 static struct input_handler joydev_handler = { 596 .event = joydev_event, 597 .connect = joydev_connect, 598 .disconnect = joydev_disconnect, 599 .fops = &joydev_fops, 600 .minor = JOYDEV_MINOR_BASE, 601 .name = "joydev", 602 .id_table = joydev_ids, 603 .blacklist = joydev_blacklist, 604 }; 605 606 static int __init joydev_init(void) 607 { 608 input_register_handler(&joydev_handler); 609 return 0; 610 } 611 612 static void __exit joydev_exit(void) 613 { 614 input_unregister_handler(&joydev_handler); 615 } 616 617 module_init(joydev_init); 618 module_exit(joydev_exit); 619