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_MAX + 1]; 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_MAX + 1]; 57 __u8 abspam[ABS_MAX + 1]; 58 __s16 abs[ABS_MAX + 1]; 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 return 0; 290 291 err_free_client: 292 joydev_detach_client(joydev, client); 293 kfree(client); 294 err_put_joydev: 295 put_device(&joydev->dev); 296 return error; 297 } 298 299 static int joydev_generate_startup_event(struct joydev_client *client, 300 struct input_dev *input, 301 struct js_event *event) 302 { 303 struct joydev *joydev = client->joydev; 304 int have_event; 305 306 spin_lock_irq(&client->buffer_lock); 307 308 have_event = client->startup < joydev->nabs + joydev->nkey; 309 310 if (have_event) { 311 312 event->time = jiffies_to_msecs(jiffies); 313 if (client->startup < joydev->nkey) { 314 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; 315 event->number = client->startup; 316 event->value = !!test_bit(joydev->keypam[event->number], 317 input->key); 318 } else { 319 event->type = JS_EVENT_AXIS | JS_EVENT_INIT; 320 event->number = client->startup - joydev->nkey; 321 event->value = joydev->abs[event->number]; 322 } 323 client->startup++; 324 } 325 326 spin_unlock_irq(&client->buffer_lock); 327 328 return have_event; 329 } 330 331 static int joydev_fetch_next_event(struct joydev_client *client, 332 struct js_event *event) 333 { 334 int have_event; 335 336 spin_lock_irq(&client->buffer_lock); 337 338 have_event = client->head != client->tail; 339 if (have_event) { 340 *event = client->buffer[client->tail++]; 341 client->tail &= JOYDEV_BUFFER_SIZE - 1; 342 } 343 344 spin_unlock_irq(&client->buffer_lock); 345 346 return have_event; 347 } 348 349 /* 350 * Old joystick interface 351 */ 352 static ssize_t joydev_0x_read(struct joydev_client *client, 353 struct input_dev *input, 354 char __user *buf) 355 { 356 struct joydev *joydev = client->joydev; 357 struct JS_DATA_TYPE data; 358 int i; 359 360 spin_lock_irq(&input->event_lock); 361 362 /* 363 * Get device state 364 */ 365 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) 366 data.buttons |= 367 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; 368 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; 369 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; 370 371 /* 372 * Reset reader's event queue 373 */ 374 spin_lock(&client->buffer_lock); 375 client->startup = 0; 376 client->tail = client->head; 377 spin_unlock(&client->buffer_lock); 378 379 spin_unlock_irq(&input->event_lock); 380 381 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) 382 return -EFAULT; 383 384 return sizeof(struct JS_DATA_TYPE); 385 } 386 387 static inline int joydev_data_pending(struct joydev_client *client) 388 { 389 struct joydev *joydev = client->joydev; 390 391 return client->startup < joydev->nabs + joydev->nkey || 392 client->head != client->tail; 393 } 394 395 static ssize_t joydev_read(struct file *file, char __user *buf, 396 size_t count, loff_t *ppos) 397 { 398 struct joydev_client *client = file->private_data; 399 struct joydev *joydev = client->joydev; 400 struct input_dev *input = joydev->handle.dev; 401 struct js_event event; 402 int retval; 403 404 if (!joydev->exist) 405 return -ENODEV; 406 407 if (count < sizeof(struct js_event)) 408 return -EINVAL; 409 410 if (count == sizeof(struct JS_DATA_TYPE)) 411 return joydev_0x_read(client, input, buf); 412 413 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) 414 return -EAGAIN; 415 416 retval = wait_event_interruptible(joydev->wait, 417 !joydev->exist || joydev_data_pending(client)); 418 if (retval) 419 return retval; 420 421 if (!joydev->exist) 422 return -ENODEV; 423 424 while (retval + sizeof(struct js_event) <= count && 425 joydev_generate_startup_event(client, input, &event)) { 426 427 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 428 return -EFAULT; 429 430 retval += sizeof(struct js_event); 431 } 432 433 while (retval + sizeof(struct js_event) <= count && 434 joydev_fetch_next_event(client, &event)) { 435 436 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 437 return -EFAULT; 438 439 retval += sizeof(struct js_event); 440 } 441 442 return retval; 443 } 444 445 /* No kernel lock - fine */ 446 static unsigned int joydev_poll(struct file *file, poll_table *wait) 447 { 448 struct joydev_client *client = file->private_data; 449 struct joydev *joydev = client->joydev; 450 451 poll_wait(file, &joydev->wait, wait); 452 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | 453 (joydev->exist ? 0 : (POLLHUP | POLLERR)); 454 } 455 456 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, 457 void __user *argp, size_t len) 458 { 459 __u8 *abspam; 460 int i; 461 int retval = 0; 462 463 len = min(len, sizeof(joydev->abspam)); 464 465 /* Validate the map. */ 466 abspam = kmalloc(len, GFP_KERNEL); 467 if (!abspam) 468 return -ENOMEM; 469 470 if (copy_from_user(abspam, argp, len)) { 471 retval = -EFAULT; 472 goto out; 473 } 474 475 for (i = 0; i < joydev->nabs; i++) { 476 if (abspam[i] > ABS_MAX) { 477 retval = -EINVAL; 478 goto out; 479 } 480 } 481 482 memcpy(joydev->abspam, abspam, len); 483 484 out: 485 kfree(abspam); 486 return retval; 487 } 488 489 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, 490 void __user *argp, size_t len) 491 { 492 __u16 *keypam; 493 int i; 494 int retval = 0; 495 496 len = min(len, sizeof(joydev->keypam)); 497 498 /* Validate the map. */ 499 keypam = kmalloc(len, GFP_KERNEL); 500 if (!keypam) 501 return -ENOMEM; 502 503 if (copy_from_user(keypam, argp, len)) { 504 retval = -EFAULT; 505 goto out; 506 } 507 508 for (i = 0; i < joydev->nkey; i++) { 509 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { 510 retval = -EINVAL; 511 goto out; 512 } 513 } 514 515 memcpy(joydev->keypam, keypam, len); 516 517 for (i = 0; i < joydev->nkey; i++) 518 joydev->keymap[keypam[i] - BTN_MISC] = i; 519 520 out: 521 kfree(keypam); 522 return retval; 523 } 524 525 526 static int joydev_ioctl_common(struct joydev *joydev, 527 unsigned int cmd, void __user *argp) 528 { 529 struct input_dev *dev = joydev->handle.dev; 530 size_t len; 531 int i, j; 532 const char *name; 533 534 /* Process fixed-sized commands. */ 535 switch (cmd) { 536 537 case JS_SET_CAL: 538 return copy_from_user(&joydev->glue.JS_CORR, argp, 539 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 540 541 case JS_GET_CAL: 542 return copy_to_user(argp, &joydev->glue.JS_CORR, 543 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 544 545 case JS_SET_TIMEOUT: 546 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 547 548 case JS_GET_TIMEOUT: 549 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 550 551 case JSIOCGVERSION: 552 return put_user(JS_VERSION, (__u32 __user *) argp); 553 554 case JSIOCGAXES: 555 return put_user(joydev->nabs, (__u8 __user *) argp); 556 557 case JSIOCGBUTTONS: 558 return put_user(joydev->nkey, (__u8 __user *) argp); 559 560 case JSIOCSCORR: 561 if (copy_from_user(joydev->corr, argp, 562 sizeof(joydev->corr[0]) * joydev->nabs)) 563 return -EFAULT; 564 565 for (i = 0; i < joydev->nabs; i++) { 566 j = joydev->abspam[i]; 567 joydev->abs[i] = joydev_correct(dev->abs[j], 568 &joydev->corr[i]); 569 } 570 return 0; 571 572 case JSIOCGCORR: 573 return copy_to_user(argp, joydev->corr, 574 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 575 576 } 577 578 /* 579 * Process variable-sized commands (the axis and button map commands 580 * are considered variable-sized to decouple them from the values of 581 * ABS_MAX and KEY_MAX). 582 */ 583 switch (cmd & ~IOCSIZE_MASK) { 584 585 case (JSIOCSAXMAP & ~IOCSIZE_MASK): 586 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); 587 588 case (JSIOCGAXMAP & ~IOCSIZE_MASK): 589 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); 590 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; 591 592 case (JSIOCSBTNMAP & ~IOCSIZE_MASK): 593 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); 594 595 case (JSIOCGBTNMAP & ~IOCSIZE_MASK): 596 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); 597 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; 598 599 case JSIOCGNAME(0): 600 name = dev->name; 601 if (!name) 602 return 0; 603 604 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); 605 return copy_to_user(argp, name, len) ? -EFAULT : len; 606 } 607 608 return -EINVAL; 609 } 610 611 #ifdef CONFIG_COMPAT 612 static long joydev_compat_ioctl(struct file *file, 613 unsigned int cmd, unsigned long arg) 614 { 615 struct joydev_client *client = file->private_data; 616 struct joydev *joydev = client->joydev; 617 void __user *argp = (void __user *)arg; 618 s32 tmp32; 619 struct JS_DATA_SAVE_TYPE_32 ds32; 620 int retval; 621 622 retval = mutex_lock_interruptible(&joydev->mutex); 623 if (retval) 624 return retval; 625 626 if (!joydev->exist) { 627 retval = -ENODEV; 628 goto out; 629 } 630 631 switch (cmd) { 632 633 case JS_SET_TIMELIMIT: 634 retval = get_user(tmp32, (s32 __user *) arg); 635 if (retval == 0) 636 joydev->glue.JS_TIMELIMIT = tmp32; 637 break; 638 639 case JS_GET_TIMELIMIT: 640 tmp32 = joydev->glue.JS_TIMELIMIT; 641 retval = put_user(tmp32, (s32 __user *) arg); 642 break; 643 644 case JS_SET_ALL: 645 retval = copy_from_user(&ds32, argp, 646 sizeof(ds32)) ? -EFAULT : 0; 647 if (retval == 0) { 648 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 649 joydev->glue.BUSY = ds32.BUSY; 650 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 651 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 652 joydev->glue.JS_SAVE = ds32.JS_SAVE; 653 joydev->glue.JS_CORR = ds32.JS_CORR; 654 } 655 break; 656 657 case JS_GET_ALL: 658 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 659 ds32.BUSY = joydev->glue.BUSY; 660 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 661 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 662 ds32.JS_SAVE = joydev->glue.JS_SAVE; 663 ds32.JS_CORR = joydev->glue.JS_CORR; 664 665 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; 666 break; 667 668 default: 669 retval = joydev_ioctl_common(joydev, cmd, argp); 670 break; 671 } 672 673 out: 674 mutex_unlock(&joydev->mutex); 675 return retval; 676 } 677 #endif /* CONFIG_COMPAT */ 678 679 static long joydev_ioctl(struct file *file, 680 unsigned int cmd, unsigned long arg) 681 { 682 struct joydev_client *client = file->private_data; 683 struct joydev *joydev = client->joydev; 684 void __user *argp = (void __user *)arg; 685 int retval; 686 687 retval = mutex_lock_interruptible(&joydev->mutex); 688 if (retval) 689 return retval; 690 691 if (!joydev->exist) { 692 retval = -ENODEV; 693 goto out; 694 } 695 696 switch (cmd) { 697 698 case JS_SET_TIMELIMIT: 699 retval = get_user(joydev->glue.JS_TIMELIMIT, 700 (long __user *) arg); 701 break; 702 703 case JS_GET_TIMELIMIT: 704 retval = put_user(joydev->glue.JS_TIMELIMIT, 705 (long __user *) arg); 706 break; 707 708 case JS_SET_ALL: 709 retval = copy_from_user(&joydev->glue, argp, 710 sizeof(joydev->glue)) ? -EFAULT: 0; 711 break; 712 713 case JS_GET_ALL: 714 retval = copy_to_user(argp, &joydev->glue, 715 sizeof(joydev->glue)) ? -EFAULT : 0; 716 break; 717 718 default: 719 retval = joydev_ioctl_common(joydev, cmd, argp); 720 break; 721 } 722 out: 723 mutex_unlock(&joydev->mutex); 724 return retval; 725 } 726 727 static const struct file_operations joydev_fops = { 728 .owner = THIS_MODULE, 729 .read = joydev_read, 730 .poll = joydev_poll, 731 .open = joydev_open, 732 .release = joydev_release, 733 .unlocked_ioctl = joydev_ioctl, 734 #ifdef CONFIG_COMPAT 735 .compat_ioctl = joydev_compat_ioctl, 736 #endif 737 .fasync = joydev_fasync, 738 }; 739 740 static int joydev_install_chrdev(struct joydev *joydev) 741 { 742 joydev_table[joydev->minor] = joydev; 743 return 0; 744 } 745 746 static void joydev_remove_chrdev(struct joydev *joydev) 747 { 748 mutex_lock(&joydev_table_mutex); 749 joydev_table[joydev->minor] = NULL; 750 mutex_unlock(&joydev_table_mutex); 751 } 752 753 /* 754 * Mark device non-existant. This disables writes, ioctls and 755 * prevents new users from opening the device. Already posted 756 * blocking reads will stay, however new ones will fail. 757 */ 758 static void joydev_mark_dead(struct joydev *joydev) 759 { 760 mutex_lock(&joydev->mutex); 761 joydev->exist = 0; 762 mutex_unlock(&joydev->mutex); 763 } 764 765 static void joydev_cleanup(struct joydev *joydev) 766 { 767 struct input_handle *handle = &joydev->handle; 768 769 joydev_mark_dead(joydev); 770 joydev_hangup(joydev); 771 joydev_remove_chrdev(joydev); 772 773 /* joydev is marked dead so noone else accesses joydev->open */ 774 if (joydev->open) 775 input_close_device(handle); 776 } 777 778 static int joydev_connect(struct input_handler *handler, struct input_dev *dev, 779 const struct input_device_id *id) 780 { 781 struct joydev *joydev; 782 int i, j, t, minor; 783 int error; 784 785 for (minor = 0; minor < JOYDEV_MINORS; minor++) 786 if (!joydev_table[minor]) 787 break; 788 789 if (minor == JOYDEV_MINORS) { 790 printk(KERN_ERR "joydev: no more free joydev devices\n"); 791 return -ENFILE; 792 } 793 794 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); 795 if (!joydev) 796 return -ENOMEM; 797 798 INIT_LIST_HEAD(&joydev->client_list); 799 spin_lock_init(&joydev->client_lock); 800 mutex_init(&joydev->mutex); 801 init_waitqueue_head(&joydev->wait); 802 803 dev_set_name(&joydev->dev, "js%d", minor); 804 joydev->exist = 1; 805 joydev->minor = minor; 806 807 joydev->exist = 1; 808 joydev->handle.dev = input_get_device(dev); 809 joydev->handle.name = dev_name(&joydev->dev); 810 joydev->handle.handler = handler; 811 joydev->handle.private = joydev; 812 813 for (i = 0; i < ABS_MAX + 1; i++) 814 if (test_bit(i, dev->absbit)) { 815 joydev->absmap[i] = joydev->nabs; 816 joydev->abspam[joydev->nabs] = i; 817 joydev->nabs++; 818 } 819 820 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 821 if (test_bit(i + BTN_MISC, dev->keybit)) { 822 joydev->keymap[i] = joydev->nkey; 823 joydev->keypam[joydev->nkey] = i + BTN_MISC; 824 joydev->nkey++; 825 } 826 827 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 828 if (test_bit(i + BTN_MISC, dev->keybit)) { 829 joydev->keymap[i] = joydev->nkey; 830 joydev->keypam[joydev->nkey] = i + BTN_MISC; 831 joydev->nkey++; 832 } 833 834 for (i = 0; i < joydev->nabs; i++) { 835 j = joydev->abspam[i]; 836 if (dev->absmax[j] == dev->absmin[j]) { 837 joydev->corr[i].type = JS_CORR_NONE; 838 joydev->abs[i] = dev->abs[j]; 839 continue; 840 } 841 joydev->corr[i].type = JS_CORR_BROKEN; 842 joydev->corr[i].prec = dev->absfuzz[j]; 843 joydev->corr[i].coef[0] = 844 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; 845 joydev->corr[i].coef[1] = 846 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; 847 848 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]; 849 if (t) { 850 joydev->corr[i].coef[2] = (1 << 29) / t; 851 joydev->corr[i].coef[3] = (1 << 29) / t; 852 853 joydev->abs[i] = joydev_correct(dev->abs[j], 854 joydev->corr + i); 855 } 856 } 857 858 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor); 859 joydev->dev.class = &input_class; 860 joydev->dev.parent = &dev->dev; 861 joydev->dev.release = joydev_free; 862 device_initialize(&joydev->dev); 863 864 error = input_register_handle(&joydev->handle); 865 if (error) 866 goto err_free_joydev; 867 868 error = joydev_install_chrdev(joydev); 869 if (error) 870 goto err_unregister_handle; 871 872 error = device_add(&joydev->dev); 873 if (error) 874 goto err_cleanup_joydev; 875 876 return 0; 877 878 err_cleanup_joydev: 879 joydev_cleanup(joydev); 880 err_unregister_handle: 881 input_unregister_handle(&joydev->handle); 882 err_free_joydev: 883 put_device(&joydev->dev); 884 return error; 885 } 886 887 static void joydev_disconnect(struct input_handle *handle) 888 { 889 struct joydev *joydev = handle->private; 890 891 device_del(&joydev->dev); 892 joydev_cleanup(joydev); 893 input_unregister_handle(handle); 894 put_device(&joydev->dev); 895 } 896 897 static const struct input_device_id joydev_blacklist[] = { 898 { 899 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 900 INPUT_DEVICE_ID_MATCH_KEYBIT, 901 .evbit = { BIT_MASK(EV_KEY) }, 902 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 903 }, /* Avoid itouchpads and touchscreens */ 904 { 905 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 906 INPUT_DEVICE_ID_MATCH_KEYBIT, 907 .evbit = { BIT_MASK(EV_KEY) }, 908 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) }, 909 }, /* Avoid tablets, digitisers and similar devices */ 910 { } /* Terminating entry */ 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 { } /* Terminating entry */ 933 }; 934 935 MODULE_DEVICE_TABLE(input, joydev_ids); 936 937 static struct input_handler joydev_handler = { 938 .event = joydev_event, 939 .connect = joydev_connect, 940 .disconnect = joydev_disconnect, 941 .fops = &joydev_fops, 942 .minor = JOYDEV_MINOR_BASE, 943 .name = "joydev", 944 .id_table = joydev_ids, 945 .blacklist = joydev_blacklist, 946 }; 947 948 static int __init joydev_init(void) 949 { 950 return input_register_handler(&joydev_handler); 951 } 952 953 static void __exit joydev_exit(void) 954 { 955 input_unregister_handler(&joydev_handler); 956 } 957 958 module_init(joydev_init); 959 module_exit(joydev_exit); 960