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 = kmalloc(sizeof(struct joydev_list), GFP_KERNEL))) 175 return -ENOMEM; 176 memset(list, 0, sizeof(struct joydev_list)); 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 poll_wait(file, &list->joydev->wait, wait); 281 return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? 282 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR)); 283 } 284 285 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp) 286 { 287 struct input_dev *dev = joydev->handle.dev; 288 int i, j; 289 290 switch (cmd) { 291 292 case JS_SET_CAL: 293 return copy_from_user(&joydev->glue.JS_CORR, argp, 294 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 295 case JS_GET_CAL: 296 return copy_to_user(argp, &joydev->glue.JS_CORR, 297 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 298 case JS_SET_TIMEOUT: 299 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 300 case JS_GET_TIMEOUT: 301 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 302 303 case JSIOCGVERSION: 304 return put_user(JS_VERSION, (__u32 __user *) argp); 305 case JSIOCGAXES: 306 return put_user(joydev->nabs, (__u8 __user *) argp); 307 case JSIOCGBUTTONS: 308 return put_user(joydev->nkey, (__u8 __user *) argp); 309 case JSIOCSCORR: 310 if (copy_from_user(joydev->corr, argp, 311 sizeof(joydev->corr[0]) * joydev->nabs)) 312 return -EFAULT; 313 for (i = 0; i < joydev->nabs; i++) { 314 j = joydev->abspam[i]; 315 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); 316 } 317 return 0; 318 case JSIOCGCORR: 319 return copy_to_user(argp, joydev->corr, 320 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 321 case JSIOCSAXMAP: 322 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1))) 323 return -EFAULT; 324 for (i = 0; i < joydev->nabs; i++) { 325 if (joydev->abspam[i] > ABS_MAX) return -EINVAL; 326 joydev->absmap[joydev->abspam[i]] = i; 327 } 328 return 0; 329 case JSIOCGAXMAP: 330 return copy_to_user(argp, joydev->abspam, 331 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0; 332 case JSIOCSBTNMAP: 333 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1))) 334 return -EFAULT; 335 for (i = 0; i < joydev->nkey; i++) { 336 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL; 337 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; 338 } 339 return 0; 340 case JSIOCGBTNMAP: 341 return copy_to_user(argp, joydev->keypam, 342 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0; 343 default: 344 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) { 345 int len; 346 if (!dev->name) return 0; 347 len = strlen(dev->name) + 1; 348 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 349 if (copy_to_user(argp, dev->name, len)) return -EFAULT; 350 return len; 351 } 352 } 353 return -EINVAL; 354 } 355 356 #ifdef CONFIG_COMPAT 357 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 358 { 359 struct joydev_list *list = file->private_data; 360 struct joydev *joydev = list->joydev; 361 void __user *argp = (void __user *)arg; 362 s32 tmp32; 363 struct JS_DATA_SAVE_TYPE_32 ds32; 364 int err; 365 366 if (!joydev->exist) return -ENODEV; 367 switch(cmd) { 368 case JS_SET_TIMELIMIT: 369 err = get_user(tmp32, (s32 __user *) arg); 370 if (err == 0) 371 joydev->glue.JS_TIMELIMIT = tmp32; 372 break; 373 case JS_GET_TIMELIMIT: 374 tmp32 = joydev->glue.JS_TIMELIMIT; 375 err = put_user(tmp32, (s32 __user *) arg); 376 break; 377 378 case JS_SET_ALL: 379 err = copy_from_user(&ds32, argp, 380 sizeof(ds32)) ? -EFAULT : 0; 381 if (err == 0) { 382 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 383 joydev->glue.BUSY = ds32.BUSY; 384 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 385 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 386 joydev->glue.JS_SAVE = ds32.JS_SAVE; 387 joydev->glue.JS_CORR = ds32.JS_CORR; 388 } 389 break; 390 391 case JS_GET_ALL: 392 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 393 ds32.BUSY = joydev->glue.BUSY; 394 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 395 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 396 ds32.JS_SAVE = joydev->glue.JS_SAVE; 397 ds32.JS_CORR = joydev->glue.JS_CORR; 398 399 err = copy_to_user(argp, &ds32, 400 sizeof(ds32)) ? -EFAULT : 0; 401 break; 402 403 default: 404 err = joydev_ioctl_common(joydev, cmd, argp); 405 } 406 return err; 407 } 408 #endif /* CONFIG_COMPAT */ 409 410 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 411 { 412 struct joydev_list *list = file->private_data; 413 struct joydev *joydev = list->joydev; 414 void __user *argp = (void __user *)arg; 415 416 if (!joydev->exist) return -ENODEV; 417 418 switch(cmd) { 419 case JS_SET_TIMELIMIT: 420 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); 421 case JS_GET_TIMELIMIT: 422 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); 423 case JS_SET_ALL: 424 return copy_from_user(&joydev->glue, argp, 425 sizeof(joydev->glue)) ? -EFAULT : 0; 426 case JS_GET_ALL: 427 return copy_to_user(argp, &joydev->glue, 428 sizeof(joydev->glue)) ? -EFAULT : 0; 429 default: 430 return joydev_ioctl_common(joydev, cmd, argp); 431 } 432 } 433 434 static struct file_operations joydev_fops = { 435 .owner = THIS_MODULE, 436 .read = joydev_read, 437 .write = joydev_write, 438 .poll = joydev_poll, 439 .open = joydev_open, 440 .release = joydev_release, 441 .ioctl = joydev_ioctl, 442 #ifdef CONFIG_COMPAT 443 .compat_ioctl = joydev_compat_ioctl, 444 #endif 445 .fasync = joydev_fasync, 446 }; 447 448 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) 449 { 450 struct joydev *joydev; 451 struct class_device *cdev; 452 int i, j, t, minor; 453 454 for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++); 455 if (minor == JOYDEV_MINORS) { 456 printk(KERN_ERR "joydev: no more free joydev devices\n"); 457 return NULL; 458 } 459 460 if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL))) 461 return NULL; 462 memset(joydev, 0, sizeof(struct joydev)); 463 464 INIT_LIST_HEAD(&joydev->list); 465 init_waitqueue_head(&joydev->wait); 466 467 joydev->minor = minor; 468 joydev->exist = 1; 469 joydev->handle.dev = dev; 470 joydev->handle.name = joydev->name; 471 joydev->handle.handler = handler; 472 joydev->handle.private = joydev; 473 sprintf(joydev->name, "js%d", minor); 474 475 for (i = 0; i < ABS_MAX + 1; i++) 476 if (test_bit(i, dev->absbit)) { 477 joydev->absmap[i] = joydev->nabs; 478 joydev->abspam[joydev->nabs] = i; 479 joydev->nabs++; 480 } 481 482 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 483 if (test_bit(i + BTN_MISC, dev->keybit)) { 484 joydev->keymap[i] = joydev->nkey; 485 joydev->keypam[joydev->nkey] = i + BTN_MISC; 486 joydev->nkey++; 487 } 488 489 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 490 if (test_bit(i + BTN_MISC, dev->keybit)) { 491 joydev->keymap[i] = joydev->nkey; 492 joydev->keypam[joydev->nkey] = i + BTN_MISC; 493 joydev->nkey++; 494 } 495 496 for (i = 0; i < joydev->nabs; i++) { 497 j = joydev->abspam[i]; 498 if (dev->absmax[j] == dev->absmin[j]) { 499 joydev->corr[i].type = JS_CORR_NONE; 500 joydev->abs[i] = dev->abs[j]; 501 continue; 502 } 503 joydev->corr[i].type = JS_CORR_BROKEN; 504 joydev->corr[i].prec = dev->absfuzz[j]; 505 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; 506 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; 507 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]))) 508 continue; 509 joydev->corr[i].coef[2] = (1 << 29) / t; 510 joydev->corr[i].coef[3] = (1 << 29) / t; 511 512 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); 513 } 514 515 joydev_table[minor] = joydev; 516 517 cdev = class_device_create(&input_class, &dev->cdev, 518 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), 519 dev->cdev.dev, joydev->name); 520 521 /* temporary symlink to keep userspace happy */ 522 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, 523 joydev->name); 524 525 return &joydev->handle; 526 } 527 528 static void joydev_disconnect(struct input_handle *handle) 529 { 530 struct joydev *joydev = handle->private; 531 struct joydev_list *list; 532 533 sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name); 534 class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor)); 535 joydev->exist = 0; 536 537 if (joydev->open) { 538 input_close_device(handle); 539 wake_up_interruptible(&joydev->wait); 540 list_for_each_entry(list, &joydev->list, node) 541 kill_fasync(&list->fasync, SIGIO, POLL_HUP); 542 } else 543 joydev_free(joydev); 544 } 545 546 static struct input_device_id joydev_blacklist[] = { 547 { 548 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, 549 .evbit = { BIT(EV_KEY) }, 550 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, 551 }, /* Avoid itouchpads, touchscreens and tablets */ 552 { }, /* Terminating entry */ 553 }; 554 555 static struct input_device_id joydev_ids[] = { 556 { 557 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 558 .evbit = { BIT(EV_ABS) }, 559 .absbit = { BIT(ABS_X) }, 560 }, 561 { 562 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 563 .evbit = { BIT(EV_ABS) }, 564 .absbit = { BIT(ABS_WHEEL) }, 565 }, 566 { 567 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, 568 .evbit = { BIT(EV_ABS) }, 569 .absbit = { BIT(ABS_THROTTLE) }, 570 }, 571 { }, /* Terminating entry */ 572 }; 573 574 MODULE_DEVICE_TABLE(input, joydev_ids); 575 576 static struct input_handler joydev_handler = { 577 .event = joydev_event, 578 .connect = joydev_connect, 579 .disconnect = joydev_disconnect, 580 .fops = &joydev_fops, 581 .minor = JOYDEV_MINOR_BASE, 582 .name = "joydev", 583 .id_table = joydev_ids, 584 .blacklist = joydev_blacklist, 585 }; 586 587 static int __init joydev_init(void) 588 { 589 input_register_handler(&joydev_handler); 590 return 0; 591 } 592 593 static void __exit joydev_exit(void) 594 { 595 input_unregister_handler(&joydev_handler); 596 } 597 598 module_init(joydev_init); 599 module_exit(joydev_exit); 600