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