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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <asm/io.h> 16 #include <linux/delay.h> 17 #include <linux/errno.h> 18 #include <linux/joystick.h> 19 #include <linux/input.h> 20 #include <linux/kernel.h> 21 #include <linux/major.h> 22 #include <linux/sched.h> 23 #include <linux/slab.h> 24 #include <linux/mm.h> 25 #include <linux/module.h> 26 #include <linux/poll.h> 27 #include <linux/init.h> 28 #include <linux/device.h> 29 #include <linux/cdev.h> 30 31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 32 MODULE_DESCRIPTION("Joystick device interfaces"); 33 MODULE_SUPPORTED_DEVICE("input/js"); 34 MODULE_LICENSE("GPL"); 35 36 #define JOYDEV_MINOR_BASE 0 37 #define JOYDEV_MINORS 16 38 #define JOYDEV_BUFFER_SIZE 64 39 40 struct joydev { 41 int open; 42 struct input_handle handle; 43 wait_queue_head_t wait; 44 struct list_head client_list; 45 spinlock_t client_lock; /* protects client_list */ 46 struct mutex mutex; 47 struct device dev; 48 struct cdev cdev; 49 bool exist; 50 51 struct js_corr corr[ABS_CNT]; 52 struct JS_DATA_SAVE_TYPE glue; 53 int nabs; 54 int nkey; 55 __u16 keymap[KEY_MAX - BTN_MISC + 1]; 56 __u16 keypam[KEY_MAX - BTN_MISC + 1]; 57 __u8 absmap[ABS_CNT]; 58 __u8 abspam[ABS_CNT]; 59 __s16 abs[ABS_CNT]; 60 }; 61 62 struct joydev_client { 63 struct js_event buffer[JOYDEV_BUFFER_SIZE]; 64 int head; 65 int tail; 66 int startup; 67 spinlock_t buffer_lock; /* protects access to buffer, head and tail */ 68 struct fasync_struct *fasync; 69 struct joydev *joydev; 70 struct list_head node; 71 }; 72 73 static int joydev_correct(int value, struct js_corr *corr) 74 { 75 switch (corr->type) { 76 77 case JS_CORR_NONE: 78 break; 79 80 case JS_CORR_BROKEN: 81 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : 82 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : 83 ((corr->coef[2] * (value - corr->coef[0])) >> 14); 84 break; 85 86 default: 87 return 0; 88 } 89 90 return clamp(value, -32767, 32767); 91 } 92 93 static void joydev_pass_event(struct joydev_client *client, 94 struct js_event *event) 95 { 96 struct joydev *joydev = client->joydev; 97 98 /* 99 * IRQs already disabled, just acquire the lock 100 */ 101 spin_lock(&client->buffer_lock); 102 103 client->buffer[client->head] = *event; 104 105 if (client->startup == joydev->nabs + joydev->nkey) { 106 client->head++; 107 client->head &= JOYDEV_BUFFER_SIZE - 1; 108 if (client->tail == client->head) 109 client->startup = 0; 110 } 111 112 spin_unlock(&client->buffer_lock); 113 114 kill_fasync(&client->fasync, SIGIO, POLL_IN); 115 } 116 117 static void joydev_event(struct input_handle *handle, 118 unsigned int type, unsigned int code, int value) 119 { 120 struct joydev *joydev = handle->private; 121 struct joydev_client *client; 122 struct js_event event; 123 124 switch (type) { 125 126 case EV_KEY: 127 if (code < BTN_MISC || value == 2) 128 return; 129 event.type = JS_EVENT_BUTTON; 130 event.number = joydev->keymap[code - BTN_MISC]; 131 event.value = value; 132 break; 133 134 case EV_ABS: 135 event.type = JS_EVENT_AXIS; 136 event.number = joydev->absmap[code]; 137 event.value = joydev_correct(value, 138 &joydev->corr[event.number]); 139 if (event.value == joydev->abs[event.number]) 140 return; 141 joydev->abs[event.number] = event.value; 142 break; 143 144 default: 145 return; 146 } 147 148 event.time = jiffies_to_msecs(jiffies); 149 150 rcu_read_lock(); 151 list_for_each_entry_rcu(client, &joydev->client_list, node) 152 joydev_pass_event(client, &event); 153 rcu_read_unlock(); 154 155 wake_up_interruptible(&joydev->wait); 156 } 157 158 static int joydev_fasync(int fd, struct file *file, int on) 159 { 160 struct joydev_client *client = file->private_data; 161 162 return fasync_helper(fd, file, on, &client->fasync); 163 } 164 165 static void joydev_free(struct device *dev) 166 { 167 struct joydev *joydev = container_of(dev, struct joydev, dev); 168 169 input_put_device(joydev->handle.dev); 170 kfree(joydev); 171 } 172 173 static void joydev_attach_client(struct joydev *joydev, 174 struct joydev_client *client) 175 { 176 spin_lock(&joydev->client_lock); 177 list_add_tail_rcu(&client->node, &joydev->client_list); 178 spin_unlock(&joydev->client_lock); 179 } 180 181 static void joydev_detach_client(struct joydev *joydev, 182 struct joydev_client *client) 183 { 184 spin_lock(&joydev->client_lock); 185 list_del_rcu(&client->node); 186 spin_unlock(&joydev->client_lock); 187 synchronize_rcu(); 188 } 189 190 static void joydev_refresh_state(struct joydev *joydev) 191 { 192 struct input_dev *dev = joydev->handle.dev; 193 int i, val; 194 195 for (i = 0; i < joydev->nabs; i++) { 196 val = input_abs_get_val(dev, joydev->abspam[i]); 197 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); 198 } 199 } 200 201 static int joydev_open_device(struct joydev *joydev) 202 { 203 int retval; 204 205 retval = mutex_lock_interruptible(&joydev->mutex); 206 if (retval) 207 return retval; 208 209 if (!joydev->exist) 210 retval = -ENODEV; 211 else if (!joydev->open++) { 212 retval = input_open_device(&joydev->handle); 213 if (retval) 214 joydev->open--; 215 else 216 joydev_refresh_state(joydev); 217 } 218 219 mutex_unlock(&joydev->mutex); 220 return retval; 221 } 222 223 static void joydev_close_device(struct joydev *joydev) 224 { 225 mutex_lock(&joydev->mutex); 226 227 if (joydev->exist && !--joydev->open) 228 input_close_device(&joydev->handle); 229 230 mutex_unlock(&joydev->mutex); 231 } 232 233 /* 234 * Wake up users waiting for IO so they can disconnect from 235 * dead device. 236 */ 237 static void joydev_hangup(struct joydev *joydev) 238 { 239 struct joydev_client *client; 240 241 spin_lock(&joydev->client_lock); 242 list_for_each_entry(client, &joydev->client_list, node) 243 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 244 spin_unlock(&joydev->client_lock); 245 246 wake_up_interruptible(&joydev->wait); 247 } 248 249 static int joydev_release(struct inode *inode, struct file *file) 250 { 251 struct joydev_client *client = file->private_data; 252 struct joydev *joydev = client->joydev; 253 254 joydev_detach_client(joydev, client); 255 kfree(client); 256 257 joydev_close_device(joydev); 258 259 return 0; 260 } 261 262 static int joydev_open(struct inode *inode, struct file *file) 263 { 264 struct joydev *joydev = 265 container_of(inode->i_cdev, struct joydev, cdev); 266 struct joydev_client *client; 267 int error; 268 269 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); 270 if (!client) 271 return -ENOMEM; 272 273 spin_lock_init(&client->buffer_lock); 274 client->joydev = joydev; 275 joydev_attach_client(joydev, client); 276 277 error = joydev_open_device(joydev); 278 if (error) 279 goto err_free_client; 280 281 file->private_data = client; 282 nonseekable_open(inode, file); 283 284 return 0; 285 286 err_free_client: 287 joydev_detach_client(joydev, client); 288 kfree(client); 289 return error; 290 } 291 292 static int joydev_generate_startup_event(struct joydev_client *client, 293 struct input_dev *input, 294 struct js_event *event) 295 { 296 struct joydev *joydev = client->joydev; 297 int have_event; 298 299 spin_lock_irq(&client->buffer_lock); 300 301 have_event = client->startup < joydev->nabs + joydev->nkey; 302 303 if (have_event) { 304 305 event->time = jiffies_to_msecs(jiffies); 306 if (client->startup < joydev->nkey) { 307 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; 308 event->number = client->startup; 309 event->value = !!test_bit(joydev->keypam[event->number], 310 input->key); 311 } else { 312 event->type = JS_EVENT_AXIS | JS_EVENT_INIT; 313 event->number = client->startup - joydev->nkey; 314 event->value = joydev->abs[event->number]; 315 } 316 client->startup++; 317 } 318 319 spin_unlock_irq(&client->buffer_lock); 320 321 return have_event; 322 } 323 324 static int joydev_fetch_next_event(struct joydev_client *client, 325 struct js_event *event) 326 { 327 int have_event; 328 329 spin_lock_irq(&client->buffer_lock); 330 331 have_event = client->head != client->tail; 332 if (have_event) { 333 *event = client->buffer[client->tail++]; 334 client->tail &= JOYDEV_BUFFER_SIZE - 1; 335 } 336 337 spin_unlock_irq(&client->buffer_lock); 338 339 return have_event; 340 } 341 342 /* 343 * Old joystick interface 344 */ 345 static ssize_t joydev_0x_read(struct joydev_client *client, 346 struct input_dev *input, 347 char __user *buf) 348 { 349 struct joydev *joydev = client->joydev; 350 struct JS_DATA_TYPE data; 351 int i; 352 353 spin_lock_irq(&input->event_lock); 354 355 /* 356 * Get device state 357 */ 358 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) 359 data.buttons |= 360 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; 361 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; 362 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; 363 364 /* 365 * Reset reader's event queue 366 */ 367 spin_lock(&client->buffer_lock); 368 client->startup = 0; 369 client->tail = client->head; 370 spin_unlock(&client->buffer_lock); 371 372 spin_unlock_irq(&input->event_lock); 373 374 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) 375 return -EFAULT; 376 377 return sizeof(struct JS_DATA_TYPE); 378 } 379 380 static inline int joydev_data_pending(struct joydev_client *client) 381 { 382 struct joydev *joydev = client->joydev; 383 384 return client->startup < joydev->nabs + joydev->nkey || 385 client->head != client->tail; 386 } 387 388 static ssize_t joydev_read(struct file *file, char __user *buf, 389 size_t count, loff_t *ppos) 390 { 391 struct joydev_client *client = file->private_data; 392 struct joydev *joydev = client->joydev; 393 struct input_dev *input = joydev->handle.dev; 394 struct js_event event; 395 int retval; 396 397 if (!joydev->exist) 398 return -ENODEV; 399 400 if (count < sizeof(struct js_event)) 401 return -EINVAL; 402 403 if (count == sizeof(struct JS_DATA_TYPE)) 404 return joydev_0x_read(client, input, buf); 405 406 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) 407 return -EAGAIN; 408 409 retval = wait_event_interruptible(joydev->wait, 410 !joydev->exist || joydev_data_pending(client)); 411 if (retval) 412 return retval; 413 414 if (!joydev->exist) 415 return -ENODEV; 416 417 while (retval + sizeof(struct js_event) <= count && 418 joydev_generate_startup_event(client, input, &event)) { 419 420 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 421 return -EFAULT; 422 423 retval += sizeof(struct js_event); 424 } 425 426 while (retval + sizeof(struct js_event) <= count && 427 joydev_fetch_next_event(client, &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 return retval; 436 } 437 438 /* No kernel lock - fine */ 439 static __poll_t joydev_poll(struct file *file, poll_table *wait) 440 { 441 struct joydev_client *client = file->private_data; 442 struct joydev *joydev = client->joydev; 443 444 poll_wait(file, &joydev->wait, wait); 445 return (joydev_data_pending(client) ? (EPOLLIN | EPOLLRDNORM) : 0) | 446 (joydev->exist ? 0 : (EPOLLHUP | EPOLLERR)); 447 } 448 449 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, 450 void __user *argp, size_t len) 451 { 452 __u8 *abspam; 453 int i; 454 int retval = 0; 455 456 len = min(len, sizeof(joydev->abspam)); 457 458 /* Validate the map. */ 459 abspam = memdup_user(argp, len); 460 if (IS_ERR(abspam)) 461 return PTR_ERR(abspam); 462 463 for (i = 0; i < joydev->nabs; i++) { 464 if (abspam[i] > ABS_MAX) { 465 retval = -EINVAL; 466 goto out; 467 } 468 } 469 470 memcpy(joydev->abspam, abspam, len); 471 472 for (i = 0; i < joydev->nabs; i++) 473 joydev->absmap[joydev->abspam[i]] = i; 474 475 out: 476 kfree(abspam); 477 return retval; 478 } 479 480 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, 481 void __user *argp, size_t len) 482 { 483 __u16 *keypam; 484 int i; 485 int retval = 0; 486 487 len = min(len, sizeof(joydev->keypam)); 488 489 /* Validate the map. */ 490 keypam = memdup_user(argp, len); 491 if (IS_ERR(keypam)) 492 return PTR_ERR(keypam); 493 494 for (i = 0; i < joydev->nkey; i++) { 495 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { 496 retval = -EINVAL; 497 goto out; 498 } 499 } 500 501 memcpy(joydev->keypam, keypam, len); 502 503 for (i = 0; i < joydev->nkey; i++) 504 joydev->keymap[keypam[i] - BTN_MISC] = i; 505 506 out: 507 kfree(keypam); 508 return retval; 509 } 510 511 512 static int joydev_ioctl_common(struct joydev *joydev, 513 unsigned int cmd, void __user *argp) 514 { 515 struct input_dev *dev = joydev->handle.dev; 516 size_t len; 517 int i; 518 const char *name; 519 520 /* Process fixed-sized commands. */ 521 switch (cmd) { 522 523 case JS_SET_CAL: 524 return copy_from_user(&joydev->glue.JS_CORR, argp, 525 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 526 527 case JS_GET_CAL: 528 return copy_to_user(argp, &joydev->glue.JS_CORR, 529 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 530 531 case JS_SET_TIMEOUT: 532 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 533 534 case JS_GET_TIMEOUT: 535 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 536 537 case JSIOCGVERSION: 538 return put_user(JS_VERSION, (__u32 __user *) argp); 539 540 case JSIOCGAXES: 541 return put_user(joydev->nabs, (__u8 __user *) argp); 542 543 case JSIOCGBUTTONS: 544 return put_user(joydev->nkey, (__u8 __user *) argp); 545 546 case JSIOCSCORR: 547 if (copy_from_user(joydev->corr, argp, 548 sizeof(joydev->corr[0]) * joydev->nabs)) 549 return -EFAULT; 550 551 for (i = 0; i < joydev->nabs; i++) { 552 int val = input_abs_get_val(dev, joydev->abspam[i]); 553 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); 554 } 555 return 0; 556 557 case JSIOCGCORR: 558 return copy_to_user(argp, joydev->corr, 559 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 560 561 } 562 563 /* 564 * Process variable-sized commands (the axis and button map commands 565 * are considered variable-sized to decouple them from the values of 566 * ABS_MAX and KEY_MAX). 567 */ 568 switch (cmd & ~IOCSIZE_MASK) { 569 570 case (JSIOCSAXMAP & ~IOCSIZE_MASK): 571 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); 572 573 case (JSIOCGAXMAP & ~IOCSIZE_MASK): 574 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); 575 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; 576 577 case (JSIOCSBTNMAP & ~IOCSIZE_MASK): 578 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); 579 580 case (JSIOCGBTNMAP & ~IOCSIZE_MASK): 581 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); 582 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; 583 584 case JSIOCGNAME(0): 585 name = dev->name; 586 if (!name) 587 return 0; 588 589 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); 590 return copy_to_user(argp, name, len) ? -EFAULT : len; 591 } 592 593 return -EINVAL; 594 } 595 596 #ifdef CONFIG_COMPAT 597 static long joydev_compat_ioctl(struct file *file, 598 unsigned int cmd, unsigned long arg) 599 { 600 struct joydev_client *client = file->private_data; 601 struct joydev *joydev = client->joydev; 602 void __user *argp = (void __user *)arg; 603 s32 tmp32; 604 struct JS_DATA_SAVE_TYPE_32 ds32; 605 int retval; 606 607 retval = mutex_lock_interruptible(&joydev->mutex); 608 if (retval) 609 return retval; 610 611 if (!joydev->exist) { 612 retval = -ENODEV; 613 goto out; 614 } 615 616 switch (cmd) { 617 618 case JS_SET_TIMELIMIT: 619 retval = get_user(tmp32, (s32 __user *) arg); 620 if (retval == 0) 621 joydev->glue.JS_TIMELIMIT = tmp32; 622 break; 623 624 case JS_GET_TIMELIMIT: 625 tmp32 = joydev->glue.JS_TIMELIMIT; 626 retval = put_user(tmp32, (s32 __user *) arg); 627 break; 628 629 case JS_SET_ALL: 630 retval = copy_from_user(&ds32, argp, 631 sizeof(ds32)) ? -EFAULT : 0; 632 if (retval == 0) { 633 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 634 joydev->glue.BUSY = ds32.BUSY; 635 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 636 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 637 joydev->glue.JS_SAVE = ds32.JS_SAVE; 638 joydev->glue.JS_CORR = ds32.JS_CORR; 639 } 640 break; 641 642 case JS_GET_ALL: 643 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 644 ds32.BUSY = joydev->glue.BUSY; 645 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 646 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 647 ds32.JS_SAVE = joydev->glue.JS_SAVE; 648 ds32.JS_CORR = joydev->glue.JS_CORR; 649 650 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; 651 break; 652 653 default: 654 retval = joydev_ioctl_common(joydev, cmd, argp); 655 break; 656 } 657 658 out: 659 mutex_unlock(&joydev->mutex); 660 return retval; 661 } 662 #endif /* CONFIG_COMPAT */ 663 664 static long joydev_ioctl(struct file *file, 665 unsigned int cmd, unsigned long arg) 666 { 667 struct joydev_client *client = file->private_data; 668 struct joydev *joydev = client->joydev; 669 void __user *argp = (void __user *)arg; 670 int retval; 671 672 retval = mutex_lock_interruptible(&joydev->mutex); 673 if (retval) 674 return retval; 675 676 if (!joydev->exist) { 677 retval = -ENODEV; 678 goto out; 679 } 680 681 switch (cmd) { 682 683 case JS_SET_TIMELIMIT: 684 retval = get_user(joydev->glue.JS_TIMELIMIT, 685 (long __user *) arg); 686 break; 687 688 case JS_GET_TIMELIMIT: 689 retval = put_user(joydev->glue.JS_TIMELIMIT, 690 (long __user *) arg); 691 break; 692 693 case JS_SET_ALL: 694 retval = copy_from_user(&joydev->glue, argp, 695 sizeof(joydev->glue)) ? -EFAULT : 0; 696 break; 697 698 case JS_GET_ALL: 699 retval = copy_to_user(argp, &joydev->glue, 700 sizeof(joydev->glue)) ? -EFAULT : 0; 701 break; 702 703 default: 704 retval = joydev_ioctl_common(joydev, cmd, argp); 705 break; 706 } 707 out: 708 mutex_unlock(&joydev->mutex); 709 return retval; 710 } 711 712 static const struct file_operations joydev_fops = { 713 .owner = THIS_MODULE, 714 .read = joydev_read, 715 .poll = joydev_poll, 716 .open = joydev_open, 717 .release = joydev_release, 718 .unlocked_ioctl = joydev_ioctl, 719 #ifdef CONFIG_COMPAT 720 .compat_ioctl = joydev_compat_ioctl, 721 #endif 722 .fasync = joydev_fasync, 723 .llseek = no_llseek, 724 }; 725 726 /* 727 * Mark device non-existent. This disables writes, ioctls and 728 * prevents new users from opening the device. Already posted 729 * blocking reads will stay, however new ones will fail. 730 */ 731 static void joydev_mark_dead(struct joydev *joydev) 732 { 733 mutex_lock(&joydev->mutex); 734 joydev->exist = false; 735 mutex_unlock(&joydev->mutex); 736 } 737 738 static void joydev_cleanup(struct joydev *joydev) 739 { 740 struct input_handle *handle = &joydev->handle; 741 742 joydev_mark_dead(joydev); 743 joydev_hangup(joydev); 744 745 /* joydev is marked dead so no one else accesses joydev->open */ 746 if (joydev->open) 747 input_close_device(handle); 748 } 749 750 /* 751 * These codes are copied from from hid-ids.h, unfortunately there is no common 752 * usb_ids/bt_ids.h header. 753 */ 754 #define USB_VENDOR_ID_SONY 0x054c 755 #define USB_DEVICE_ID_SONY_PS3_CONTROLLER 0x0268 756 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER 0x05c4 757 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2 0x09cc 758 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE 0x0ba0 759 760 #define USB_VENDOR_ID_THQ 0x20d6 761 #define USB_DEVICE_ID_THQ_PS3_UDRAW 0xcb17 762 763 #define ACCEL_DEV(vnd, prd) \ 764 { \ 765 .flags = INPUT_DEVICE_ID_MATCH_VENDOR | \ 766 INPUT_DEVICE_ID_MATCH_PRODUCT | \ 767 INPUT_DEVICE_ID_MATCH_PROPBIT, \ 768 .vendor = (vnd), \ 769 .product = (prd), \ 770 .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) }, \ 771 } 772 773 static const struct input_device_id joydev_blacklist[] = { 774 /* Avoid touchpads and touchscreens */ 775 { 776 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 777 INPUT_DEVICE_ID_MATCH_KEYBIT, 778 .evbit = { BIT_MASK(EV_KEY) }, 779 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 780 }, 781 /* Avoid tablets, digitisers and similar devices */ 782 { 783 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 784 INPUT_DEVICE_ID_MATCH_KEYBIT, 785 .evbit = { BIT_MASK(EV_KEY) }, 786 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) }, 787 }, 788 /* Disable accelerometers on composite devices */ 789 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER), 790 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER), 791 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2), 792 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE), 793 ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW), 794 { /* sentinel */ } 795 }; 796 797 static bool joydev_dev_is_blacklisted(struct input_dev *dev) 798 { 799 const struct input_device_id *id; 800 801 for (id = joydev_blacklist; id->flags; id++) { 802 if (input_match_device_id(dev, id)) { 803 dev_dbg(&dev->dev, 804 "joydev: blacklisting '%s'\n", dev->name); 805 return true; 806 } 807 } 808 809 return false; 810 } 811 812 static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) 813 { 814 DECLARE_BITMAP(jd_scratch, KEY_CNT); 815 816 BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); 817 818 /* 819 * Virtualization (VMware, etc) and remote management (HP 820 * ILO2) solutions use absolute coordinates for their virtual 821 * pointing devices so that there is one-to-one relationship 822 * between pointer position on the host screen and virtual 823 * guest screen, and so their mice use ABS_X, ABS_Y and 3 824 * primary button events. This clashes with what joydev 825 * considers to be joysticks (a device with at minimum ABS_X 826 * axis). 827 * 828 * Here we are trying to separate absolute mice from 829 * joysticks. A device is, for joystick detection purposes, 830 * considered to be an absolute mouse if the following is 831 * true: 832 * 833 * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN. 834 * 2) Absolute events are exactly ABS_X and ABS_Y. 835 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE. 836 * 4) Device is not on "Amiga" bus. 837 */ 838 839 bitmap_zero(jd_scratch, EV_CNT); 840 __set_bit(EV_ABS, jd_scratch); 841 __set_bit(EV_KEY, jd_scratch); 842 __set_bit(EV_SYN, jd_scratch); 843 if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) 844 return false; 845 846 bitmap_zero(jd_scratch, ABS_CNT); 847 __set_bit(ABS_X, jd_scratch); 848 __set_bit(ABS_Y, jd_scratch); 849 if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) 850 return false; 851 852 bitmap_zero(jd_scratch, KEY_CNT); 853 __set_bit(BTN_LEFT, jd_scratch); 854 __set_bit(BTN_RIGHT, jd_scratch); 855 __set_bit(BTN_MIDDLE, jd_scratch); 856 857 if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) 858 return false; 859 860 /* 861 * Amiga joystick (amijoy) historically uses left/middle/right 862 * button events. 863 */ 864 if (dev->id.bustype == BUS_AMIGA) 865 return false; 866 867 return true; 868 } 869 870 static bool joydev_match(struct input_handler *handler, struct input_dev *dev) 871 { 872 /* Disable blacklisted devices */ 873 if (joydev_dev_is_blacklisted(dev)) 874 return false; 875 876 /* Avoid absolute mice */ 877 if (joydev_dev_is_absolute_mouse(dev)) 878 return false; 879 880 return true; 881 } 882 883 static int joydev_connect(struct input_handler *handler, struct input_dev *dev, 884 const struct input_device_id *id) 885 { 886 struct joydev *joydev; 887 int i, j, t, minor, dev_no; 888 int error; 889 890 minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); 891 if (minor < 0) { 892 error = minor; 893 pr_err("failed to reserve new minor: %d\n", error); 894 return error; 895 } 896 897 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); 898 if (!joydev) { 899 error = -ENOMEM; 900 goto err_free_minor; 901 } 902 903 INIT_LIST_HEAD(&joydev->client_list); 904 spin_lock_init(&joydev->client_lock); 905 mutex_init(&joydev->mutex); 906 init_waitqueue_head(&joydev->wait); 907 joydev->exist = true; 908 909 dev_no = minor; 910 /* Normalize device number if it falls into legacy range */ 911 if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) 912 dev_no -= JOYDEV_MINOR_BASE; 913 dev_set_name(&joydev->dev, "js%d", dev_no); 914 915 joydev->handle.dev = input_get_device(dev); 916 joydev->handle.name = dev_name(&joydev->dev); 917 joydev->handle.handler = handler; 918 joydev->handle.private = joydev; 919 920 for_each_set_bit(i, dev->absbit, ABS_CNT) { 921 joydev->absmap[i] = joydev->nabs; 922 joydev->abspam[joydev->nabs] = i; 923 joydev->nabs++; 924 } 925 926 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 927 if (test_bit(i + BTN_MISC, dev->keybit)) { 928 joydev->keymap[i] = joydev->nkey; 929 joydev->keypam[joydev->nkey] = i + BTN_MISC; 930 joydev->nkey++; 931 } 932 933 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 934 if (test_bit(i + BTN_MISC, dev->keybit)) { 935 joydev->keymap[i] = joydev->nkey; 936 joydev->keypam[joydev->nkey] = i + BTN_MISC; 937 joydev->nkey++; 938 } 939 940 for (i = 0; i < joydev->nabs; i++) { 941 j = joydev->abspam[i]; 942 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { 943 joydev->corr[i].type = JS_CORR_NONE; 944 continue; 945 } 946 joydev->corr[i].type = JS_CORR_BROKEN; 947 joydev->corr[i].prec = input_abs_get_fuzz(dev, j); 948 949 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; 950 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); 951 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); 952 953 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 954 - 2 * input_abs_get_flat(dev, j); 955 if (t) { 956 joydev->corr[i].coef[2] = (1 << 29) / t; 957 joydev->corr[i].coef[3] = (1 << 29) / t; 958 } 959 } 960 961 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor); 962 joydev->dev.class = &input_class; 963 joydev->dev.parent = &dev->dev; 964 joydev->dev.release = joydev_free; 965 device_initialize(&joydev->dev); 966 967 error = input_register_handle(&joydev->handle); 968 if (error) 969 goto err_free_joydev; 970 971 cdev_init(&joydev->cdev, &joydev_fops); 972 973 error = cdev_device_add(&joydev->cdev, &joydev->dev); 974 if (error) 975 goto err_cleanup_joydev; 976 977 return 0; 978 979 err_cleanup_joydev: 980 joydev_cleanup(joydev); 981 input_unregister_handle(&joydev->handle); 982 err_free_joydev: 983 put_device(&joydev->dev); 984 err_free_minor: 985 input_free_minor(minor); 986 return error; 987 } 988 989 static void joydev_disconnect(struct input_handle *handle) 990 { 991 struct joydev *joydev = handle->private; 992 993 cdev_device_del(&joydev->cdev, &joydev->dev); 994 joydev_cleanup(joydev); 995 input_free_minor(MINOR(joydev->dev.devt)); 996 input_unregister_handle(handle); 997 put_device(&joydev->dev); 998 } 999 1000 static const struct input_device_id joydev_ids[] = { 1001 { 1002 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1003 INPUT_DEVICE_ID_MATCH_ABSBIT, 1004 .evbit = { BIT_MASK(EV_ABS) }, 1005 .absbit = { BIT_MASK(ABS_X) }, 1006 }, 1007 { 1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1009 INPUT_DEVICE_ID_MATCH_ABSBIT, 1010 .evbit = { BIT_MASK(EV_ABS) }, 1011 .absbit = { BIT_MASK(ABS_Z) }, 1012 }, 1013 { 1014 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1015 INPUT_DEVICE_ID_MATCH_ABSBIT, 1016 .evbit = { BIT_MASK(EV_ABS) }, 1017 .absbit = { BIT_MASK(ABS_WHEEL) }, 1018 }, 1019 { 1020 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1021 INPUT_DEVICE_ID_MATCH_ABSBIT, 1022 .evbit = { BIT_MASK(EV_ABS) }, 1023 .absbit = { BIT_MASK(ABS_THROTTLE) }, 1024 }, 1025 { 1026 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1027 INPUT_DEVICE_ID_MATCH_KEYBIT, 1028 .evbit = { BIT_MASK(EV_KEY) }, 1029 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, 1030 }, 1031 { 1032 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1033 INPUT_DEVICE_ID_MATCH_KEYBIT, 1034 .evbit = { BIT_MASK(EV_KEY) }, 1035 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, 1036 }, 1037 { 1038 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1039 INPUT_DEVICE_ID_MATCH_KEYBIT, 1040 .evbit = { BIT_MASK(EV_KEY) }, 1041 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, 1042 }, 1043 { } /* Terminating entry */ 1044 }; 1045 1046 MODULE_DEVICE_TABLE(input, joydev_ids); 1047 1048 static struct input_handler joydev_handler = { 1049 .event = joydev_event, 1050 .match = joydev_match, 1051 .connect = joydev_connect, 1052 .disconnect = joydev_disconnect, 1053 .legacy_minors = true, 1054 .minor = JOYDEV_MINOR_BASE, 1055 .name = "joydev", 1056 .id_table = joydev_ids, 1057 }; 1058 1059 static int __init joydev_init(void) 1060 { 1061 return input_register_handler(&joydev_handler); 1062 } 1063 1064 static void __exit joydev_exit(void) 1065 { 1066 input_unregister_handler(&joydev_handler); 1067 } 1068 1069 module_init(joydev_init); 1070 module_exit(joydev_exit); 1071