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/sched.h> 22 #include <linux/slab.h> 23 #include <linux/mm.h> 24 #include <linux/miscdevice.h> 25 #include <linux/module.h> 26 #include <linux/poll.h> 27 #include <linux/init.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 struct input_handle handle; 44 wait_queue_head_t wait; 45 struct list_head client_list; 46 spinlock_t client_lock; /* protects client_list */ 47 struct mutex mutex; 48 struct device dev; 49 50 struct js_corr corr[ABS_CNT]; 51 struct JS_DATA_SAVE_TYPE glue; 52 int nabs; 53 int nkey; 54 __u16 keymap[KEY_MAX - BTN_MISC + 1]; 55 __u16 keypam[KEY_MAX - BTN_MISC + 1]; 56 __u8 absmap[ABS_CNT]; 57 __u8 abspam[ABS_CNT]; 58 __s16 abs[ABS_CNT]; 59 }; 60 61 struct joydev_client { 62 struct js_event buffer[JOYDEV_BUFFER_SIZE]; 63 int head; 64 int tail; 65 int startup; 66 spinlock_t buffer_lock; /* protects access to buffer, head and tail */ 67 struct fasync_struct *fasync; 68 struct joydev *joydev; 69 struct list_head node; 70 }; 71 72 static struct joydev *joydev_table[JOYDEV_MINORS]; 73 static DEFINE_MUTEX(joydev_table_mutex); 74 75 static int joydev_correct(int value, struct js_corr *corr) 76 { 77 switch (corr->type) { 78 79 case JS_CORR_NONE: 80 break; 81 82 case JS_CORR_BROKEN: 83 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : 84 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : 85 ((corr->coef[2] * (value - corr->coef[0])) >> 14); 86 break; 87 88 default: 89 return 0; 90 } 91 92 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); 93 } 94 95 static void joydev_pass_event(struct joydev_client *client, 96 struct js_event *event) 97 { 98 struct joydev *joydev = client->joydev; 99 100 /* 101 * IRQs already disabled, just acquire the lock 102 */ 103 spin_lock(&client->buffer_lock); 104 105 client->buffer[client->head] = *event; 106 107 if (client->startup == joydev->nabs + joydev->nkey) { 108 client->head++; 109 client->head &= JOYDEV_BUFFER_SIZE - 1; 110 if (client->tail == client->head) 111 client->startup = 0; 112 } 113 114 spin_unlock(&client->buffer_lock); 115 116 kill_fasync(&client->fasync, SIGIO, POLL_IN); 117 } 118 119 static void joydev_event(struct input_handle *handle, 120 unsigned int type, unsigned int code, int value) 121 { 122 struct joydev *joydev = handle->private; 123 struct joydev_client *client; 124 struct js_event event; 125 126 switch (type) { 127 128 case EV_KEY: 129 if (code < BTN_MISC || value == 2) 130 return; 131 event.type = JS_EVENT_BUTTON; 132 event.number = joydev->keymap[code - BTN_MISC]; 133 event.value = value; 134 break; 135 136 case EV_ABS: 137 event.type = JS_EVENT_AXIS; 138 event.number = joydev->absmap[code]; 139 event.value = joydev_correct(value, 140 &joydev->corr[event.number]); 141 if (event.value == joydev->abs[event.number]) 142 return; 143 joydev->abs[event.number] = event.value; 144 break; 145 146 default: 147 return; 148 } 149 150 event.time = jiffies_to_msecs(jiffies); 151 152 rcu_read_lock(); 153 list_for_each_entry_rcu(client, &joydev->client_list, node) 154 joydev_pass_event(client, &event); 155 rcu_read_unlock(); 156 157 wake_up_interruptible(&joydev->wait); 158 } 159 160 static int joydev_fasync(int fd, struct file *file, int on) 161 { 162 struct joydev_client *client = file->private_data; 163 164 return fasync_helper(fd, file, on, &client->fasync); 165 } 166 167 static void joydev_free(struct device *dev) 168 { 169 struct joydev *joydev = container_of(dev, struct joydev, dev); 170 171 input_put_device(joydev->handle.dev); 172 kfree(joydev); 173 } 174 175 static void joydev_attach_client(struct joydev *joydev, 176 struct joydev_client *client) 177 { 178 spin_lock(&joydev->client_lock); 179 list_add_tail_rcu(&client->node, &joydev->client_list); 180 spin_unlock(&joydev->client_lock); 181 synchronize_rcu(); 182 } 183 184 static void joydev_detach_client(struct joydev *joydev, 185 struct joydev_client *client) 186 { 187 spin_lock(&joydev->client_lock); 188 list_del_rcu(&client->node); 189 spin_unlock(&joydev->client_lock); 190 synchronize_rcu(); 191 } 192 193 static int joydev_open_device(struct joydev *joydev) 194 { 195 int retval; 196 197 retval = mutex_lock_interruptible(&joydev->mutex); 198 if (retval) 199 return retval; 200 201 if (!joydev->exist) 202 retval = -ENODEV; 203 else if (!joydev->open++) { 204 retval = input_open_device(&joydev->handle); 205 if (retval) 206 joydev->open--; 207 } 208 209 mutex_unlock(&joydev->mutex); 210 return retval; 211 } 212 213 static void joydev_close_device(struct joydev *joydev) 214 { 215 mutex_lock(&joydev->mutex); 216 217 if (joydev->exist && !--joydev->open) 218 input_close_device(&joydev->handle); 219 220 mutex_unlock(&joydev->mutex); 221 } 222 223 /* 224 * Wake up users waiting for IO so they can disconnect from 225 * dead device. 226 */ 227 static void joydev_hangup(struct joydev *joydev) 228 { 229 struct joydev_client *client; 230 231 spin_lock(&joydev->client_lock); 232 list_for_each_entry(client, &joydev->client_list, node) 233 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 234 spin_unlock(&joydev->client_lock); 235 236 wake_up_interruptible(&joydev->wait); 237 } 238 239 static int joydev_release(struct inode *inode, struct file *file) 240 { 241 struct joydev_client *client = file->private_data; 242 struct joydev *joydev = client->joydev; 243 244 joydev_detach_client(joydev, client); 245 kfree(client); 246 247 joydev_close_device(joydev); 248 put_device(&joydev->dev); 249 250 return 0; 251 } 252 253 static int joydev_open(struct inode *inode, struct file *file) 254 { 255 struct joydev_client *client; 256 struct joydev *joydev; 257 int i = iminor(inode) - JOYDEV_MINOR_BASE; 258 int error; 259 260 if (i >= JOYDEV_MINORS) 261 return -ENODEV; 262 263 error = mutex_lock_interruptible(&joydev_table_mutex); 264 if (error) 265 return error; 266 joydev = joydev_table[i]; 267 if (joydev) 268 get_device(&joydev->dev); 269 mutex_unlock(&joydev_table_mutex); 270 271 if (!joydev) 272 return -ENODEV; 273 274 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); 275 if (!client) { 276 error = -ENOMEM; 277 goto err_put_joydev; 278 } 279 280 spin_lock_init(&client->buffer_lock); 281 client->joydev = joydev; 282 joydev_attach_client(joydev, client); 283 284 error = joydev_open_device(joydev); 285 if (error) 286 goto err_free_client; 287 288 file->private_data = client; 289 nonseekable_open(inode, file); 290 291 return 0; 292 293 err_free_client: 294 joydev_detach_client(joydev, client); 295 kfree(client); 296 err_put_joydev: 297 put_device(&joydev->dev); 298 return error; 299 } 300 301 static int joydev_generate_startup_event(struct joydev_client *client, 302 struct input_dev *input, 303 struct js_event *event) 304 { 305 struct joydev *joydev = client->joydev; 306 int have_event; 307 308 spin_lock_irq(&client->buffer_lock); 309 310 have_event = client->startup < joydev->nabs + joydev->nkey; 311 312 if (have_event) { 313 314 event->time = jiffies_to_msecs(jiffies); 315 if (client->startup < joydev->nkey) { 316 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; 317 event->number = client->startup; 318 event->value = !!test_bit(joydev->keypam[event->number], 319 input->key); 320 } else { 321 event->type = JS_EVENT_AXIS | JS_EVENT_INIT; 322 event->number = client->startup - joydev->nkey; 323 event->value = joydev->abs[event->number]; 324 } 325 client->startup++; 326 } 327 328 spin_unlock_irq(&client->buffer_lock); 329 330 return have_event; 331 } 332 333 static int joydev_fetch_next_event(struct joydev_client *client, 334 struct js_event *event) 335 { 336 int have_event; 337 338 spin_lock_irq(&client->buffer_lock); 339 340 have_event = client->head != client->tail; 341 if (have_event) { 342 *event = client->buffer[client->tail++]; 343 client->tail &= JOYDEV_BUFFER_SIZE - 1; 344 } 345 346 spin_unlock_irq(&client->buffer_lock); 347 348 return have_event; 349 } 350 351 /* 352 * Old joystick interface 353 */ 354 static ssize_t joydev_0x_read(struct joydev_client *client, 355 struct input_dev *input, 356 char __user *buf) 357 { 358 struct joydev *joydev = client->joydev; 359 struct JS_DATA_TYPE data; 360 int i; 361 362 spin_lock_irq(&input->event_lock); 363 364 /* 365 * Get device state 366 */ 367 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) 368 data.buttons |= 369 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; 370 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; 371 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; 372 373 /* 374 * Reset reader's event queue 375 */ 376 spin_lock(&client->buffer_lock); 377 client->startup = 0; 378 client->tail = client->head; 379 spin_unlock(&client->buffer_lock); 380 381 spin_unlock_irq(&input->event_lock); 382 383 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) 384 return -EFAULT; 385 386 return sizeof(struct JS_DATA_TYPE); 387 } 388 389 static inline int joydev_data_pending(struct joydev_client *client) 390 { 391 struct joydev *joydev = client->joydev; 392 393 return client->startup < joydev->nabs + joydev->nkey || 394 client->head != client->tail; 395 } 396 397 static ssize_t joydev_read(struct file *file, char __user *buf, 398 size_t count, loff_t *ppos) 399 { 400 struct joydev_client *client = file->private_data; 401 struct joydev *joydev = client->joydev; 402 struct input_dev *input = joydev->handle.dev; 403 struct js_event event; 404 int retval; 405 406 if (!joydev->exist) 407 return -ENODEV; 408 409 if (count < sizeof(struct js_event)) 410 return -EINVAL; 411 412 if (count == sizeof(struct JS_DATA_TYPE)) 413 return joydev_0x_read(client, input, buf); 414 415 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) 416 return -EAGAIN; 417 418 retval = wait_event_interruptible(joydev->wait, 419 !joydev->exist || joydev_data_pending(client)); 420 if (retval) 421 return retval; 422 423 if (!joydev->exist) 424 return -ENODEV; 425 426 while (retval + sizeof(struct js_event) <= count && 427 joydev_generate_startup_event(client, input, &event)) { 428 429 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 430 return -EFAULT; 431 432 retval += sizeof(struct js_event); 433 } 434 435 while (retval + sizeof(struct js_event) <= count && 436 joydev_fetch_next_event(client, &event)) { 437 438 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 439 return -EFAULT; 440 441 retval += sizeof(struct js_event); 442 } 443 444 return retval; 445 } 446 447 /* No kernel lock - fine */ 448 static unsigned int joydev_poll(struct file *file, poll_table *wait) 449 { 450 struct joydev_client *client = file->private_data; 451 struct joydev *joydev = client->joydev; 452 453 poll_wait(file, &joydev->wait, wait); 454 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | 455 (joydev->exist ? 0 : (POLLHUP | POLLERR)); 456 } 457 458 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, 459 void __user *argp, size_t len) 460 { 461 __u8 *abspam; 462 int i; 463 int retval = 0; 464 465 len = min(len, sizeof(joydev->abspam)); 466 467 /* Validate the map. */ 468 abspam = kmalloc(len, GFP_KERNEL); 469 if (!abspam) 470 return -ENOMEM; 471 472 if (copy_from_user(abspam, argp, len)) { 473 retval = -EFAULT; 474 goto out; 475 } 476 477 for (i = 0; i < joydev->nabs; i++) { 478 if (abspam[i] > ABS_MAX) { 479 retval = -EINVAL; 480 goto out; 481 } 482 } 483 484 memcpy(joydev->abspam, abspam, len); 485 486 out: 487 kfree(abspam); 488 return retval; 489 } 490 491 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, 492 void __user *argp, size_t len) 493 { 494 __u16 *keypam; 495 int i; 496 int retval = 0; 497 498 len = min(len, sizeof(joydev->keypam)); 499 500 /* Validate the map. */ 501 keypam = kmalloc(len, GFP_KERNEL); 502 if (!keypam) 503 return -ENOMEM; 504 505 if (copy_from_user(keypam, argp, len)) { 506 retval = -EFAULT; 507 goto out; 508 } 509 510 for (i = 0; i < joydev->nkey; i++) { 511 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { 512 retval = -EINVAL; 513 goto out; 514 } 515 } 516 517 memcpy(joydev->keypam, keypam, len); 518 519 for (i = 0; i < joydev->nkey; i++) 520 joydev->keymap[keypam[i] - BTN_MISC] = i; 521 522 out: 523 kfree(keypam); 524 return retval; 525 } 526 527 528 static int joydev_ioctl_common(struct joydev *joydev, 529 unsigned int cmd, void __user *argp) 530 { 531 struct input_dev *dev = joydev->handle.dev; 532 size_t len; 533 int i, j; 534 const char *name; 535 536 /* Process fixed-sized commands. */ 537 switch (cmd) { 538 539 case JS_SET_CAL: 540 return copy_from_user(&joydev->glue.JS_CORR, argp, 541 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 542 543 case JS_GET_CAL: 544 return copy_to_user(argp, &joydev->glue.JS_CORR, 545 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 546 547 case JS_SET_TIMEOUT: 548 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 549 550 case JS_GET_TIMEOUT: 551 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 552 553 case JSIOCGVERSION: 554 return put_user(JS_VERSION, (__u32 __user *) argp); 555 556 case JSIOCGAXES: 557 return put_user(joydev->nabs, (__u8 __user *) argp); 558 559 case JSIOCGBUTTONS: 560 return put_user(joydev->nkey, (__u8 __user *) argp); 561 562 case JSIOCSCORR: 563 if (copy_from_user(joydev->corr, argp, 564 sizeof(joydev->corr[0]) * joydev->nabs)) 565 return -EFAULT; 566 567 for (i = 0; i < joydev->nabs; i++) { 568 j = joydev->abspam[i]; 569 joydev->abs[i] = joydev_correct(dev->abs[j], 570 &joydev->corr[i]); 571 } 572 return 0; 573 574 case JSIOCGCORR: 575 return copy_to_user(argp, joydev->corr, 576 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 577 578 } 579 580 /* 581 * Process variable-sized commands (the axis and button map commands 582 * are considered variable-sized to decouple them from the values of 583 * ABS_MAX and KEY_MAX). 584 */ 585 switch (cmd & ~IOCSIZE_MASK) { 586 587 case (JSIOCSAXMAP & ~IOCSIZE_MASK): 588 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); 589 590 case (JSIOCGAXMAP & ~IOCSIZE_MASK): 591 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); 592 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; 593 594 case (JSIOCSBTNMAP & ~IOCSIZE_MASK): 595 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); 596 597 case (JSIOCGBTNMAP & ~IOCSIZE_MASK): 598 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); 599 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; 600 601 case JSIOCGNAME(0): 602 name = dev->name; 603 if (!name) 604 return 0; 605 606 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); 607 return copy_to_user(argp, name, len) ? -EFAULT : len; 608 } 609 610 return -EINVAL; 611 } 612 613 #ifdef CONFIG_COMPAT 614 static long joydev_compat_ioctl(struct file *file, 615 unsigned int cmd, unsigned long arg) 616 { 617 struct joydev_client *client = file->private_data; 618 struct joydev *joydev = client->joydev; 619 void __user *argp = (void __user *)arg; 620 s32 tmp32; 621 struct JS_DATA_SAVE_TYPE_32 ds32; 622 int retval; 623 624 retval = mutex_lock_interruptible(&joydev->mutex); 625 if (retval) 626 return retval; 627 628 if (!joydev->exist) { 629 retval = -ENODEV; 630 goto out; 631 } 632 633 switch (cmd) { 634 635 case JS_SET_TIMELIMIT: 636 retval = get_user(tmp32, (s32 __user *) arg); 637 if (retval == 0) 638 joydev->glue.JS_TIMELIMIT = tmp32; 639 break; 640 641 case JS_GET_TIMELIMIT: 642 tmp32 = joydev->glue.JS_TIMELIMIT; 643 retval = put_user(tmp32, (s32 __user *) arg); 644 break; 645 646 case JS_SET_ALL: 647 retval = copy_from_user(&ds32, argp, 648 sizeof(ds32)) ? -EFAULT : 0; 649 if (retval == 0) { 650 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 651 joydev->glue.BUSY = ds32.BUSY; 652 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 653 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 654 joydev->glue.JS_SAVE = ds32.JS_SAVE; 655 joydev->glue.JS_CORR = ds32.JS_CORR; 656 } 657 break; 658 659 case JS_GET_ALL: 660 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 661 ds32.BUSY = joydev->glue.BUSY; 662 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 663 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 664 ds32.JS_SAVE = joydev->glue.JS_SAVE; 665 ds32.JS_CORR = joydev->glue.JS_CORR; 666 667 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; 668 break; 669 670 default: 671 retval = joydev_ioctl_common(joydev, cmd, argp); 672 break; 673 } 674 675 out: 676 mutex_unlock(&joydev->mutex); 677 return retval; 678 } 679 #endif /* CONFIG_COMPAT */ 680 681 static long joydev_ioctl(struct file *file, 682 unsigned int cmd, unsigned long arg) 683 { 684 struct joydev_client *client = file->private_data; 685 struct joydev *joydev = client->joydev; 686 void __user *argp = (void __user *)arg; 687 int retval; 688 689 retval = mutex_lock_interruptible(&joydev->mutex); 690 if (retval) 691 return retval; 692 693 if (!joydev->exist) { 694 retval = -ENODEV; 695 goto out; 696 } 697 698 switch (cmd) { 699 700 case JS_SET_TIMELIMIT: 701 retval = get_user(joydev->glue.JS_TIMELIMIT, 702 (long __user *) arg); 703 break; 704 705 case JS_GET_TIMELIMIT: 706 retval = put_user(joydev->glue.JS_TIMELIMIT, 707 (long __user *) arg); 708 break; 709 710 case JS_SET_ALL: 711 retval = copy_from_user(&joydev->glue, argp, 712 sizeof(joydev->glue)) ? -EFAULT: 0; 713 break; 714 715 case JS_GET_ALL: 716 retval = copy_to_user(argp, &joydev->glue, 717 sizeof(joydev->glue)) ? -EFAULT : 0; 718 break; 719 720 default: 721 retval = joydev_ioctl_common(joydev, cmd, argp); 722 break; 723 } 724 out: 725 mutex_unlock(&joydev->mutex); 726 return retval; 727 } 728 729 static const struct file_operations joydev_fops = { 730 .owner = THIS_MODULE, 731 .read = joydev_read, 732 .poll = joydev_poll, 733 .open = joydev_open, 734 .release = joydev_release, 735 .unlocked_ioctl = joydev_ioctl, 736 #ifdef CONFIG_COMPAT 737 .compat_ioctl = joydev_compat_ioctl, 738 #endif 739 .fasync = joydev_fasync, 740 }; 741 742 static int joydev_install_chrdev(struct joydev *joydev) 743 { 744 joydev_table[joydev->minor] = joydev; 745 return 0; 746 } 747 748 static void joydev_remove_chrdev(struct joydev *joydev) 749 { 750 mutex_lock(&joydev_table_mutex); 751 joydev_table[joydev->minor] = NULL; 752 mutex_unlock(&joydev_table_mutex); 753 } 754 755 /* 756 * Mark device non-existant. This disables writes, ioctls and 757 * prevents new users from opening the device. Already posted 758 * blocking reads will stay, however new ones will fail. 759 */ 760 static void joydev_mark_dead(struct joydev *joydev) 761 { 762 mutex_lock(&joydev->mutex); 763 joydev->exist = 0; 764 mutex_unlock(&joydev->mutex); 765 } 766 767 static void joydev_cleanup(struct joydev *joydev) 768 { 769 struct input_handle *handle = &joydev->handle; 770 771 joydev_mark_dead(joydev); 772 joydev_hangup(joydev); 773 joydev_remove_chrdev(joydev); 774 775 /* joydev is marked dead so noone else accesses joydev->open */ 776 if (joydev->open) 777 input_close_device(handle); 778 } 779 780 781 static bool joydev_match(struct input_handler *handler, struct input_dev *dev) 782 { 783 /* Avoid touchpads and touchscreens */ 784 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit)) 785 return false; 786 787 /* Avoid tablets, digitisers and similar devices */ 788 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit)) 789 return false; 790 791 return true; 792 } 793 794 static int joydev_connect(struct input_handler *handler, struct input_dev *dev, 795 const struct input_device_id *id) 796 { 797 struct joydev *joydev; 798 int i, j, t, minor; 799 int error; 800 801 for (minor = 0; minor < JOYDEV_MINORS; minor++) 802 if (!joydev_table[minor]) 803 break; 804 805 if (minor == JOYDEV_MINORS) { 806 printk(KERN_ERR "joydev: no more free joydev devices\n"); 807 return -ENFILE; 808 } 809 810 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); 811 if (!joydev) 812 return -ENOMEM; 813 814 INIT_LIST_HEAD(&joydev->client_list); 815 spin_lock_init(&joydev->client_lock); 816 mutex_init(&joydev->mutex); 817 init_waitqueue_head(&joydev->wait); 818 819 dev_set_name(&joydev->dev, "js%d", minor); 820 joydev->exist = 1; 821 joydev->minor = minor; 822 823 joydev->exist = 1; 824 joydev->handle.dev = input_get_device(dev); 825 joydev->handle.name = dev_name(&joydev->dev); 826 joydev->handle.handler = handler; 827 joydev->handle.private = joydev; 828 829 for (i = 0; i < ABS_CNT; i++) 830 if (test_bit(i, dev->absbit)) { 831 joydev->absmap[i] = joydev->nabs; 832 joydev->abspam[joydev->nabs] = i; 833 joydev->nabs++; 834 } 835 836 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 837 if (test_bit(i + BTN_MISC, dev->keybit)) { 838 joydev->keymap[i] = joydev->nkey; 839 joydev->keypam[joydev->nkey] = i + BTN_MISC; 840 joydev->nkey++; 841 } 842 843 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 844 if (test_bit(i + BTN_MISC, dev->keybit)) { 845 joydev->keymap[i] = joydev->nkey; 846 joydev->keypam[joydev->nkey] = i + BTN_MISC; 847 joydev->nkey++; 848 } 849 850 for (i = 0; i < joydev->nabs; i++) { 851 j = joydev->abspam[i]; 852 if (dev->absmax[j] == dev->absmin[j]) { 853 joydev->corr[i].type = JS_CORR_NONE; 854 joydev->abs[i] = dev->abs[j]; 855 continue; 856 } 857 joydev->corr[i].type = JS_CORR_BROKEN; 858 joydev->corr[i].prec = dev->absfuzz[j]; 859 joydev->corr[i].coef[0] = 860 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; 861 joydev->corr[i].coef[1] = 862 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; 863 864 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]; 865 if (t) { 866 joydev->corr[i].coef[2] = (1 << 29) / t; 867 joydev->corr[i].coef[3] = (1 << 29) / t; 868 869 joydev->abs[i] = joydev_correct(dev->abs[j], 870 joydev->corr + i); 871 } 872 } 873 874 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor); 875 joydev->dev.class = &input_class; 876 joydev->dev.parent = &dev->dev; 877 joydev->dev.release = joydev_free; 878 device_initialize(&joydev->dev); 879 880 error = input_register_handle(&joydev->handle); 881 if (error) 882 goto err_free_joydev; 883 884 error = joydev_install_chrdev(joydev); 885 if (error) 886 goto err_unregister_handle; 887 888 error = device_add(&joydev->dev); 889 if (error) 890 goto err_cleanup_joydev; 891 892 return 0; 893 894 err_cleanup_joydev: 895 joydev_cleanup(joydev); 896 err_unregister_handle: 897 input_unregister_handle(&joydev->handle); 898 err_free_joydev: 899 put_device(&joydev->dev); 900 return error; 901 } 902 903 static void joydev_disconnect(struct input_handle *handle) 904 { 905 struct joydev *joydev = handle->private; 906 907 device_del(&joydev->dev); 908 joydev_cleanup(joydev); 909 input_unregister_handle(handle); 910 put_device(&joydev->dev); 911 } 912 913 static const struct input_device_id joydev_ids[] = { 914 { 915 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 916 INPUT_DEVICE_ID_MATCH_ABSBIT, 917 .evbit = { BIT_MASK(EV_ABS) }, 918 .absbit = { BIT_MASK(ABS_X) }, 919 }, 920 { 921 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 922 INPUT_DEVICE_ID_MATCH_ABSBIT, 923 .evbit = { BIT_MASK(EV_ABS) }, 924 .absbit = { BIT_MASK(ABS_WHEEL) }, 925 }, 926 { 927 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 928 INPUT_DEVICE_ID_MATCH_ABSBIT, 929 .evbit = { BIT_MASK(EV_ABS) }, 930 .absbit = { BIT_MASK(ABS_THROTTLE) }, 931 }, 932 { 933 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 934 INPUT_DEVICE_ID_MATCH_KEYBIT, 935 .evbit = { BIT_MASK(EV_KEY) }, 936 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, 937 }, 938 { 939 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 940 INPUT_DEVICE_ID_MATCH_KEYBIT, 941 .evbit = { BIT_MASK(EV_KEY) }, 942 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, 943 }, 944 { 945 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 946 INPUT_DEVICE_ID_MATCH_KEYBIT, 947 .evbit = { BIT_MASK(EV_KEY) }, 948 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, 949 }, 950 { } /* Terminating entry */ 951 }; 952 953 MODULE_DEVICE_TABLE(input, joydev_ids); 954 955 static struct input_handler joydev_handler = { 956 .event = joydev_event, 957 .match = joydev_match, 958 .connect = joydev_connect, 959 .disconnect = joydev_disconnect, 960 .fops = &joydev_fops, 961 .minor = JOYDEV_MINOR_BASE, 962 .name = "joydev", 963 .id_table = joydev_ids, 964 }; 965 966 static int __init joydev_init(void) 967 { 968 return input_register_handler(&joydev_handler); 969 } 970 971 static void __exit joydev_exit(void) 972 { 973 input_unregister_handler(&joydev_handler); 974 } 975 976 module_init(joydev_init); 977 module_exit(joydev_exit); 978