1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Joystick device driver for the input driver suite. 4 * 5 * Copyright (c) 1999-2002 Vojtech Pavlik 6 * Copyright (c) 1999 Colin Van Dyke 7 */ 8 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11#include <asm/io.h> 12#include <linux/delay.h> 13#include <linux/errno.h> 14#include <linux/joystick.h> 15#include <linux/input.h> 16#include <linux/kernel.h> 17#include <linux/major.h> 18#include <linux/sched.h> 19#include <linux/slab.h> 20#include <linux/mm.h> 21#include <linux/module.h> 22#include <linux/poll.h> 23#include <linux/init.h> 24#include <linux/device.h> 25#include <linux/cdev.h> 26 27MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 28MODULE_DESCRIPTION("Joystick device interfaces"); 29MODULE_LICENSE("GPL"); 30 31#define JOYDEV_MINOR_BASE 0 32#define JOYDEV_MINORS 16 33#define JOYDEV_BUFFER_SIZE 64 34 35struct joydev { 36 int open; 37 struct input_handle handle; 38 wait_queue_head_t wait; 39 struct list_head client_list; 40 spinlock_t client_lock; /* protects client_list */ 41 struct mutex mutex; 42 struct device dev; 43 struct cdev cdev; 44 bool exist; 45 46 struct js_corr corr[ABS_CNT]; 47 struct JS_DATA_SAVE_TYPE glue; 48 int nabs; 49 int nkey; 50 __u16 keymap[KEY_MAX - BTN_MISC + 1]; 51 __u16 keypam[KEY_MAX - BTN_MISC + 1]; 52 __u8 absmap[ABS_CNT]; 53 __u8 abspam[ABS_CNT]; 54 __s16 abs[ABS_CNT]; 55}; 56 57struct joydev_client { 58 struct js_event buffer[JOYDEV_BUFFER_SIZE]; 59 int head; 60 int tail; 61 int startup; 62 spinlock_t buffer_lock; /* protects access to buffer, head and tail */ 63 struct fasync_struct *fasync; 64 struct joydev *joydev; 65 struct list_head node; 66}; 67 68static int joydev_correct(int value, struct js_corr *corr) 69{ 70 switch (corr->type) { 71 72 case JS_CORR_NONE: 73 break; 74 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 81 default: 82 return 0; 83 } 84 85 return clamp(value, -32767, 32767); 86} 87 88static void joydev_pass_event(struct joydev_client *client, 89 struct js_event *event) 90{ 91 struct joydev *joydev = client->joydev; 92 93 /* 94 * IRQs already disabled, just acquire the lock 95 */ 96 spin_lock(&client->buffer_lock); 97 98 client->buffer[client->head] = *event; 99 100 if (client->startup == joydev->nabs + joydev->nkey) { 101 client->head++; 102 client->head &= JOYDEV_BUFFER_SIZE - 1; 103 if (client->tail == client->head) 104 client->startup = 0; 105 } 106 107 spin_unlock(&client->buffer_lock); 108 109 kill_fasync(&client->fasync, SIGIO, POLL_IN); 110} 111 112static void joydev_event(struct input_handle *handle, 113 unsigned int type, unsigned int code, int value) 114{ 115 struct joydev *joydev = handle->private; 116 struct joydev_client *client; 117 struct js_event event; 118 119 switch (type) { 120 121 case EV_KEY: 122 if (code < BTN_MISC || value == 2) 123 return; 124 event.type = JS_EVENT_BUTTON; 125 event.number = joydev->keymap[code - BTN_MISC]; 126 event.value = value; 127 break; 128 129 case EV_ABS: 130 event.type = JS_EVENT_AXIS; 131 event.number = joydev->absmap[code]; 132 event.value = joydev_correct(value, 133 &joydev->corr[event.number]); 134 if (event.value == joydev->abs[event.number]) 135 return; 136 joydev->abs[event.number] = event.value; 137 break; 138 139 default: 140 return; 141 } 142 143 event.time = jiffies_to_msecs(jiffies); 144 145 rcu_read_lock(); 146 list_for_each_entry_rcu(client, &joydev->client_list, node) 147 joydev_pass_event(client, &event); 148 rcu_read_unlock(); 149 150 wake_up_interruptible(&joydev->wait); 151} 152 153static int joydev_fasync(int fd, struct file *file, int on) 154{ 155 struct joydev_client *client = file->private_data; 156 157 return fasync_helper(fd, file, on, &client->fasync); 158} 159 160static void joydev_free(struct device *dev) 161{ 162 struct joydev *joydev = container_of(dev, struct joydev, dev); 163 164 input_put_device(joydev->handle.dev); 165 kfree(joydev); 166} 167 168static void joydev_attach_client(struct joydev *joydev, 169 struct joydev_client *client) 170{ 171 spin_lock(&joydev->client_lock); 172 list_add_tail_rcu(&client->node, &joydev->client_list); 173 spin_unlock(&joydev->client_lock); 174} 175 176static void joydev_detach_client(struct joydev *joydev, 177 struct joydev_client *client) 178{ 179 spin_lock(&joydev->client_lock); 180 list_del_rcu(&client->node); 181 spin_unlock(&joydev->client_lock); 182 synchronize_rcu(); 183} 184 185static void joydev_refresh_state(struct joydev *joydev) 186{ 187 struct input_dev *dev = joydev->handle.dev; 188 int i, val; 189 190 for (i = 0; i < joydev->nabs; i++) { 191 val = input_abs_get_val(dev, joydev->abspam[i]); 192 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); 193 } 194} 195 196static int joydev_open_device(struct joydev *joydev) 197{ 198 int retval; 199 200 retval = mutex_lock_interruptible(&joydev->mutex); 201 if (retval) 202 return retval; 203 204 if (!joydev->exist) 205 retval = -ENODEV; 206 else if (!joydev->open++) { 207 retval = input_open_device(&joydev->handle); 208 if (retval) 209 joydev->open--; 210 else 211 joydev_refresh_state(joydev); 212 } 213 214 mutex_unlock(&joydev->mutex); 215 return retval; 216} 217 218static void joydev_close_device(struct joydev *joydev) 219{ 220 mutex_lock(&joydev->mutex); 221 222 if (joydev->exist && !--joydev->open) 223 input_close_device(&joydev->handle); 224 225 mutex_unlock(&joydev->mutex); 226} 227 228/* 229 * Wake up users waiting for IO so they can disconnect from 230 * dead device. 231 */ 232static void joydev_hangup(struct joydev *joydev) 233{ 234 struct joydev_client *client; 235 236 spin_lock(&joydev->client_lock); 237 list_for_each_entry(client, &joydev->client_list, node) 238 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 239 spin_unlock(&joydev->client_lock); 240 241 wake_up_interruptible(&joydev->wait); 242} 243 244static int joydev_release(struct inode *inode, struct file *file) 245{ 246 struct joydev_client *client = file->private_data; 247 struct joydev *joydev = client->joydev; 248 249 joydev_detach_client(joydev, client); 250 kfree(client); 251 252 joydev_close_device(joydev); 253 254 return 0; 255} 256 257static int joydev_open(struct inode *inode, struct file *file) 258{ 259 struct joydev *joydev = 260 container_of(inode->i_cdev, struct joydev, cdev); 261 struct joydev_client *client; 262 int error; 263 264 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); 265 if (!client) 266 return -ENOMEM; 267 268 spin_lock_init(&client->buffer_lock); 269 client->joydev = joydev; 270 joydev_attach_client(joydev, client); 271 272 error = joydev_open_device(joydev); 273 if (error) 274 goto err_free_client; 275 276 file->private_data = client; 277 stream_open(inode, file); 278 279 return 0; 280 281 err_free_client: 282 joydev_detach_client(joydev, client); 283 kfree(client); 284 return error; 285} 286 287static int joydev_generate_startup_event(struct joydev_client *client, 288 struct input_dev *input, 289 struct js_event *event) 290{ 291 struct joydev *joydev = client->joydev; 292 int have_event; 293 294 spin_lock_irq(&client->buffer_lock); 295 296 have_event = client->startup < joydev->nabs + joydev->nkey; 297 298 if (have_event) { 299 300 event->time = jiffies_to_msecs(jiffies); 301 if (client->startup < joydev->nkey) { 302 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; 303 event->number = client->startup; 304 event->value = !!test_bit(joydev->keypam[event->number], 305 input->key); 306 } else { 307 event->type = JS_EVENT_AXIS | JS_EVENT_INIT; 308 event->number = client->startup - joydev->nkey; 309 event->value = joydev->abs[event->number]; 310 } 311 client->startup++; 312 } 313 314 spin_unlock_irq(&client->buffer_lock); 315 316 return have_event; 317} 318 319static int joydev_fetch_next_event(struct joydev_client *client, 320 struct js_event *event) 321{ 322 int have_event; 323 324 spin_lock_irq(&client->buffer_lock); 325 326 have_event = client->head != client->tail; 327 if (have_event) { 328 *event = client->buffer[client->tail++]; 329 client->tail &= JOYDEV_BUFFER_SIZE - 1; 330 } 331 332 spin_unlock_irq(&client->buffer_lock); 333 334 return have_event; 335} 336 337/* 338 * Old joystick interface 339 */ 340static ssize_t joydev_0x_read(struct joydev_client *client, 341 struct input_dev *input, 342 char __user *buf) 343{ 344 struct joydev *joydev = client->joydev; 345 struct JS_DATA_TYPE data; 346 int i; 347 348 spin_lock_irq(&input->event_lock); 349 350 /* 351 * Get device state 352 */ 353 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) 354 data.buttons |= 355 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; 356 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; 357 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; 358 359 /* 360 * Reset reader's event queue 361 */ 362 spin_lock(&client->buffer_lock); 363 client->startup = 0; 364 client->tail = client->head; 365 spin_unlock(&client->buffer_lock); 366 367 spin_unlock_irq(&input->event_lock); 368 369 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) 370 return -EFAULT; 371 372 return sizeof(struct JS_DATA_TYPE); 373} 374 375static inline int joydev_data_pending(struct joydev_client *client) 376{ 377 struct joydev *joydev = client->joydev; 378 379 return client->startup < joydev->nabs + joydev->nkey || 380 client->head != client->tail; 381} 382 383static ssize_t joydev_read(struct file *file, char __user *buf, 384 size_t count, loff_t *ppos) 385{ 386 struct joydev_client *client = file->private_data; 387 struct joydev *joydev = client->joydev; 388 struct input_dev *input = joydev->handle.dev; 389 struct js_event event; 390 int retval; 391 392 if (!joydev->exist) 393 return -ENODEV; 394 395 if (count < sizeof(struct js_event)) 396 return -EINVAL; 397 398 if (count == sizeof(struct JS_DATA_TYPE)) 399 return joydev_0x_read(client, input, buf); 400 401 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) 402 return -EAGAIN; 403 404 retval = wait_event_interruptible(joydev->wait, 405 !joydev->exist || joydev_data_pending(client)); 406 if (retval) 407 return retval; 408 409 if (!joydev->exist) 410 return -ENODEV; 411 412 while (retval + sizeof(struct js_event) <= count && 413 joydev_generate_startup_event(client, input, &event)) { 414 415 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 416 return -EFAULT; 417 418 retval += sizeof(struct js_event); 419 } 420 421 while (retval + sizeof(struct js_event) <= count && 422 joydev_fetch_next_event(client, &event)) { 423 424 if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) 425 return -EFAULT; 426 427 retval += sizeof(struct js_event); 428 } 429 430 return retval; 431} 432 433/* No kernel lock - fine */ 434static __poll_t joydev_poll(struct file *file, poll_table *wait) 435{ 436 struct joydev_client *client = file->private_data; 437 struct joydev *joydev = client->joydev; 438 439 poll_wait(file, &joydev->wait, wait); 440 return (joydev_data_pending(client) ? (EPOLLIN | EPOLLRDNORM) : 0) | 441 (joydev->exist ? 0 : (EPOLLHUP | EPOLLERR)); 442} 443 444static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, 445 void __user *argp, size_t len) 446{ 447 __u8 *abspam; 448 int i; 449 int retval = 0; 450 451 len = min(len, sizeof(joydev->abspam)); 452 453 /* Validate the map. */ 454 abspam = memdup_user(argp, len); 455 if (IS_ERR(abspam)) 456 return PTR_ERR(abspam); 457 458 for (i = 0; i < len && i < joydev->nabs; i++) { 459 if (abspam[i] > ABS_MAX) { 460 retval = -EINVAL; 461 goto out; 462 } 463 } 464 465 memcpy(joydev->abspam, abspam, len); 466 467 for (i = 0; i < joydev->nabs; i++) 468 joydev->absmap[joydev->abspam[i]] = i; 469 470 out: 471 kfree(abspam); 472 return retval; 473} 474 475static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, 476 void __user *argp, size_t len) 477{ 478 __u16 *keypam; 479 int i; 480 int retval = 0; 481 482 if (len % sizeof(*keypam)) 483 return -EINVAL; 484 485 len = min(len, sizeof(joydev->keypam)); 486 487 /* Validate the map. */ 488 keypam = memdup_user(argp, len); 489 if (IS_ERR(keypam)) 490 return PTR_ERR(keypam); 491 492 for (i = 0; i < (len / 2) && i < joydev->nkey; i++) { 493 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { 494 retval = -EINVAL; 495 goto out; 496 } 497 } 498 499 memcpy(joydev->keypam, keypam, len); 500 501 for (i = 0; i < joydev->nkey; i++) 502 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; 503 504 out: 505 kfree(keypam); 506 return retval; 507} 508 509 510static int joydev_ioctl_common(struct joydev *joydev, 511 unsigned int cmd, void __user *argp) 512{ 513 struct input_dev *dev = joydev->handle.dev; 514 size_t len; 515 int i; 516 const char *name; 517 518 /* Process fixed-sized commands. */ 519 switch (cmd) { 520 521 case JS_SET_CAL: 522 return copy_from_user(&joydev->glue.JS_CORR, argp, 523 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 524 525 case JS_GET_CAL: 526 return copy_to_user(argp, &joydev->glue.JS_CORR, 527 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; 528 529 case JS_SET_TIMEOUT: 530 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 531 532 case JS_GET_TIMEOUT: 533 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); 534 535 case JSIOCGVERSION: 536 return put_user(JS_VERSION, (__u32 __user *) argp); 537 538 case JSIOCGAXES: 539 return put_user(joydev->nabs, (__u8 __user *) argp); 540 541 case JSIOCGBUTTONS: 542 return put_user(joydev->nkey, (__u8 __user *) argp); 543 544 case JSIOCSCORR: 545 if (copy_from_user(joydev->corr, argp, 546 sizeof(joydev->corr[0]) * joydev->nabs)) 547 return -EFAULT; 548 549 for (i = 0; i < joydev->nabs; i++) { 550 int val = input_abs_get_val(dev, joydev->abspam[i]); 551 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); 552 } 553 return 0; 554 555 case JSIOCGCORR: 556 return copy_to_user(argp, joydev->corr, 557 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; 558 559 } 560 561 /* 562 * Process variable-sized commands (the axis and button map commands 563 * are considered variable-sized to decouple them from the values of 564 * ABS_MAX and KEY_MAX). 565 */ 566 switch (cmd & ~IOCSIZE_MASK) { 567 568 case (JSIOCSAXMAP & ~IOCSIZE_MASK): 569 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); 570 571 case (JSIOCGAXMAP & ~IOCSIZE_MASK): 572 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); 573 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; 574 575 case (JSIOCSBTNMAP & ~IOCSIZE_MASK): 576 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); 577 578 case (JSIOCGBTNMAP & ~IOCSIZE_MASK): 579 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); 580 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; 581 582 case JSIOCGNAME(0): 583 name = dev->name; 584 if (!name) 585 return 0; 586 587 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); 588 return copy_to_user(argp, name, len) ? -EFAULT : len; 589 } 590 591 return -EINVAL; 592} 593 594#ifdef CONFIG_COMPAT 595static long joydev_compat_ioctl(struct file *file, 596 unsigned int cmd, unsigned long arg) 597{ 598 struct joydev_client *client = file->private_data; 599 struct joydev *joydev = client->joydev; 600 void __user *argp = (void __user *)arg; 601 s32 tmp32; 602 struct JS_DATA_SAVE_TYPE_32 ds32; 603 int retval; 604 605 retval = mutex_lock_interruptible(&joydev->mutex); 606 if (retval) 607 return retval; 608 609 if (!joydev->exist) { 610 retval = -ENODEV; 611 goto out; 612 } 613 614 switch (cmd) { 615 616 case JS_SET_TIMELIMIT: 617 retval = get_user(tmp32, (s32 __user *) arg); 618 if (retval == 0) 619 joydev->glue.JS_TIMELIMIT = tmp32; 620 break; 621 622 case JS_GET_TIMELIMIT: 623 tmp32 = joydev->glue.JS_TIMELIMIT; 624 retval = put_user(tmp32, (s32 __user *) arg); 625 break; 626 627 case JS_SET_ALL: 628 retval = copy_from_user(&ds32, argp, 629 sizeof(ds32)) ? -EFAULT : 0; 630 if (retval == 0) { 631 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; 632 joydev->glue.BUSY = ds32.BUSY; 633 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; 634 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; 635 joydev->glue.JS_SAVE = ds32.JS_SAVE; 636 joydev->glue.JS_CORR = ds32.JS_CORR; 637 } 638 break; 639 640 case JS_GET_ALL: 641 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; 642 ds32.BUSY = joydev->glue.BUSY; 643 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; 644 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; 645 ds32.JS_SAVE = joydev->glue.JS_SAVE; 646 ds32.JS_CORR = joydev->glue.JS_CORR; 647 648 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; 649 break; 650 651 default: 652 retval = joydev_ioctl_common(joydev, cmd, argp); 653 break; 654 } 655 656 out: 657 mutex_unlock(&joydev->mutex); 658 return retval; 659} 660#endif /* CONFIG_COMPAT */ 661 662static long joydev_ioctl(struct file *file, 663 unsigned int cmd, unsigned long arg) 664{ 665 struct joydev_client *client = file->private_data; 666 struct joydev *joydev = client->joydev; 667 void __user *argp = (void __user *)arg; 668 int retval; 669 670 retval = mutex_lock_interruptible(&joydev->mutex); 671 if (retval) 672 return retval; 673 674 if (!joydev->exist) { 675 retval = -ENODEV; 676 goto out; 677 } 678 679 switch (cmd) { 680 681 case JS_SET_TIMELIMIT: 682 retval = get_user(joydev->glue.JS_TIMELIMIT, 683 (long __user *) arg); 684 break; 685 686 case JS_GET_TIMELIMIT: 687 retval = put_user(joydev->glue.JS_TIMELIMIT, 688 (long __user *) arg); 689 break; 690 691 case JS_SET_ALL: 692 retval = copy_from_user(&joydev->glue, argp, 693 sizeof(joydev->glue)) ? -EFAULT : 0; 694 break; 695 696 case JS_GET_ALL: 697 retval = copy_to_user(argp, &joydev->glue, 698 sizeof(joydev->glue)) ? -EFAULT : 0; 699 break; 700 701 default: 702 retval = joydev_ioctl_common(joydev, cmd, argp); 703 break; 704 } 705 out: 706 mutex_unlock(&joydev->mutex); 707 return retval; 708} 709 710static const struct file_operations joydev_fops = { 711 .owner = THIS_MODULE, 712 .read = joydev_read, 713 .poll = joydev_poll, 714 .open = joydev_open, 715 .release = joydev_release, 716 .unlocked_ioctl = joydev_ioctl, 717#ifdef CONFIG_COMPAT 718 .compat_ioctl = joydev_compat_ioctl, 719#endif 720 .fasync = joydev_fasync, 721 .llseek = no_llseek, 722}; 723 724/* 725 * Mark device non-existent. This disables writes, ioctls and 726 * prevents new users from opening the device. Already posted 727 * blocking reads will stay, however new ones will fail. 728 */ 729static void joydev_mark_dead(struct joydev *joydev) 730{ 731 mutex_lock(&joydev->mutex); 732 joydev->exist = false; 733 mutex_unlock(&joydev->mutex); 734} 735 736static void joydev_cleanup(struct joydev *joydev) 737{ 738 struct input_handle *handle = &joydev->handle; 739 740 joydev_mark_dead(joydev); 741 joydev_hangup(joydev); 742 743 /* joydev is marked dead so no one else accesses joydev->open */ 744 if (joydev->open) 745 input_close_device(handle); 746} 747 748/* 749 * These codes are copied from hid-ids.h, unfortunately there is no common 750 * usb_ids/bt_ids.h header. 751 */ 752#define USB_VENDOR_ID_SONY 0x054c 753#define USB_DEVICE_ID_SONY_PS3_CONTROLLER 0x0268 754#define USB_DEVICE_ID_SONY_PS4_CONTROLLER 0x05c4 755#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2 0x09cc 756#define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE 0x0ba0 757 758#define USB_VENDOR_ID_THQ 0x20d6 759#define USB_DEVICE_ID_THQ_PS3_UDRAW 0xcb17 760 761#define USB_VENDOR_ID_NINTENDO 0x057e 762#define USB_DEVICE_ID_NINTENDO_JOYCONL 0x2006 763#define USB_DEVICE_ID_NINTENDO_JOYCONR 0x2007 764#define USB_DEVICE_ID_NINTENDO_PROCON 0x2009 765#define USB_DEVICE_ID_NINTENDO_CHRGGRIP 0x200E 766 767#define ACCEL_DEV(vnd, prd) \ 768 { \ 769 .flags = INPUT_DEVICE_ID_MATCH_VENDOR | \ 770 INPUT_DEVICE_ID_MATCH_PRODUCT | \ 771 INPUT_DEVICE_ID_MATCH_PROPBIT, \ 772 .vendor = (vnd), \ 773 .product = (prd), \ 774 .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) }, \ 775 } 776 777static const struct input_device_id joydev_blacklist[] = { 778 /* Avoid touchpads and touchscreens */ 779 { 780 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 781 INPUT_DEVICE_ID_MATCH_KEYBIT, 782 .evbit = { BIT_MASK(EV_KEY) }, 783 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 784 }, 785 /* Avoid tablets, digitisers and similar devices */ 786 { 787 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 788 INPUT_DEVICE_ID_MATCH_KEYBIT, 789 .evbit = { BIT_MASK(EV_KEY) }, 790 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) }, 791 }, 792 /* Disable accelerometers on composite devices */ 793 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER), 794 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER), 795 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2), 796 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE), 797 ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW), 798 ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_PROCON), 799 ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_CHRGGRIP), 800 ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_JOYCONL), 801 ACCEL_DEV(USB_VENDOR_ID_NINTENDO, USB_DEVICE_ID_NINTENDO_JOYCONR), 802 { /* sentinel */ } 803}; 804 805static bool joydev_dev_is_blacklisted(struct input_dev *dev) 806{ 807 const struct input_device_id *id; 808 809 for (id = joydev_blacklist; id->flags; id++) { 810 if (input_match_device_id(dev, id)) { 811 dev_dbg(&dev->dev, 812 "joydev: blacklisting '%s'\n", dev->name); 813 return true; 814 } 815 } 816 817 return false; 818} 819 820static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) 821{ 822 DECLARE_BITMAP(jd_scratch, KEY_CNT); 823 bool ev_match = false; 824 825 BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); 826 827 /* 828 * Virtualization (VMware, etc) and remote management (HP 829 * ILO2) solutions use absolute coordinates for their virtual 830 * pointing devices so that there is one-to-one relationship 831 * between pointer position on the host screen and virtual 832 * guest screen, and so their mice use ABS_X, ABS_Y and 3 833 * primary button events. This clashes with what joydev 834 * considers to be joysticks (a device with at minimum ABS_X 835 * axis). 836 * 837 * Here we are trying to separate absolute mice from 838 * joysticks. A device is, for joystick detection purposes, 839 * considered to be an absolute mouse if the following is 840 * true: 841 * 842 * 1) Event types are exactly 843 * EV_ABS, EV_KEY and EV_SYN 844 * or 845 * EV_ABS, EV_KEY, EV_SYN and EV_MSC 846 * or 847 * EV_ABS, EV_KEY, EV_SYN, EV_MSC and EV_REL. 848 * 2) Absolute events are exactly ABS_X and ABS_Y. 849 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE. 850 * 4) Device is not on "Amiga" bus. 851 */ 852 853 bitmap_zero(jd_scratch, EV_CNT); 854 /* VMware VMMouse, HP ILO2 */ 855 __set_bit(EV_ABS, jd_scratch); 856 __set_bit(EV_KEY, jd_scratch); 857 __set_bit(EV_SYN, jd_scratch); 858 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) 859 ev_match = true; 860 861 /* HP ILO2, AMI BMC firmware */ 862 __set_bit(EV_MSC, jd_scratch); 863 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) 864 ev_match = true; 865 866 /* VMware Virtual USB Mouse, QEMU USB Tablet, ATEN BMC firmware */ 867 __set_bit(EV_REL, jd_scratch); 868 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) 869 ev_match = true; 870 871 if (!ev_match) 872 return false; 873 874 bitmap_zero(jd_scratch, ABS_CNT); 875 __set_bit(ABS_X, jd_scratch); 876 __set_bit(ABS_Y, jd_scratch); 877 if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) 878 return false; 879 880 bitmap_zero(jd_scratch, KEY_CNT); 881 __set_bit(BTN_LEFT, jd_scratch); 882 __set_bit(BTN_RIGHT, jd_scratch); 883 __set_bit(BTN_MIDDLE, jd_scratch); 884 885 if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) 886 return false; 887 888 /* 889 * Amiga joystick (amijoy) historically uses left/middle/right 890 * button events. 891 */ 892 if (dev->id.bustype == BUS_AMIGA) 893 return false; 894 895 return true; 896} 897 898static bool joydev_match(struct input_handler *handler, struct input_dev *dev) 899{ 900 /* Disable blacklisted devices */ 901 if (joydev_dev_is_blacklisted(dev)) 902 return false; 903 904 /* Avoid absolute mice */ 905 if (joydev_dev_is_absolute_mouse(dev)) 906 return false; 907 908 return true; 909} 910 911static int joydev_connect(struct input_handler *handler, struct input_dev *dev, 912 const struct input_device_id *id) 913{ 914 struct joydev *joydev; 915 int i, j, t, minor, dev_no; 916 int error; 917 918 minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); 919 if (minor < 0) { 920 error = minor; 921 pr_err("failed to reserve new minor: %d\n", error); 922 return error; 923 } 924 925 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); 926 if (!joydev) { 927 error = -ENOMEM; 928 goto err_free_minor; 929 } 930 931 INIT_LIST_HEAD(&joydev->client_list); 932 spin_lock_init(&joydev->client_lock); 933 mutex_init(&joydev->mutex); 934 init_waitqueue_head(&joydev->wait); 935 joydev->exist = true; 936 937 dev_no = minor; 938 /* Normalize device number if it falls into legacy range */ 939 if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) 940 dev_no -= JOYDEV_MINOR_BASE; 941 dev_set_name(&joydev->dev, "js%d", dev_no); 942 943 joydev->handle.dev = input_get_device(dev); 944 joydev->handle.name = dev_name(&joydev->dev); 945 joydev->handle.handler = handler; 946 joydev->handle.private = joydev; 947 948 for_each_set_bit(i, dev->absbit, ABS_CNT) { 949 joydev->absmap[i] = joydev->nabs; 950 joydev->abspam[joydev->nabs] = i; 951 joydev->nabs++; 952 } 953 954 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) 955 if (test_bit(i + BTN_MISC, dev->keybit)) { 956 joydev->keymap[i] = joydev->nkey; 957 joydev->keypam[joydev->nkey] = i + BTN_MISC; 958 joydev->nkey++; 959 } 960 961 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) 962 if (test_bit(i + BTN_MISC, dev->keybit)) { 963 joydev->keymap[i] = joydev->nkey; 964 joydev->keypam[joydev->nkey] = i + BTN_MISC; 965 joydev->nkey++; 966 } 967 968 for (i = 0; i < joydev->nabs; i++) { 969 j = joydev->abspam[i]; 970 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { 971 joydev->corr[i].type = JS_CORR_NONE; 972 continue; 973 } 974 joydev->corr[i].type = JS_CORR_BROKEN; 975 joydev->corr[i].prec = input_abs_get_fuzz(dev, j); 976 977 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; 978 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); 979 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); 980 981 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 982 - 2 * input_abs_get_flat(dev, j); 983 if (t) { 984 joydev->corr[i].coef[2] = (1 << 29) / t; 985 joydev->corr[i].coef[3] = (1 << 29) / t; 986 } 987 } 988 989 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor); 990 joydev->dev.class = &input_class; 991 joydev->dev.parent = &dev->dev; 992 joydev->dev.release = joydev_free; 993 device_initialize(&joydev->dev); 994 995 error = input_register_handle(&joydev->handle); 996 if (error) 997 goto err_free_joydev; 998 999 cdev_init(&joydev->cdev, &joydev_fops); 1000 1001 error = cdev_device_add(&joydev->cdev, &joydev->dev); 1002 if (error) 1003 goto err_cleanup_joydev; 1004 1005 return 0; 1006 1007 err_cleanup_joydev: 1008 joydev_cleanup(joydev); 1009 input_unregister_handle(&joydev->handle); 1010 err_free_joydev: 1011 put_device(&joydev->dev); 1012 err_free_minor: 1013 input_free_minor(minor); 1014 return error; 1015} 1016 1017static void joydev_disconnect(struct input_handle *handle) 1018{ 1019 struct joydev *joydev = handle->private; 1020 1021 cdev_device_del(&joydev->cdev, &joydev->dev); 1022 joydev_cleanup(joydev); 1023 input_free_minor(MINOR(joydev->dev.devt)); 1024 input_unregister_handle(handle); 1025 put_device(&joydev->dev); 1026} 1027 1028static const struct input_device_id joydev_ids[] = { 1029 { 1030 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1031 INPUT_DEVICE_ID_MATCH_ABSBIT, 1032 .evbit = { BIT_MASK(EV_ABS) }, 1033 .absbit = { BIT_MASK(ABS_X) }, 1034 }, 1035 { 1036 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1037 INPUT_DEVICE_ID_MATCH_ABSBIT, 1038 .evbit = { BIT_MASK(EV_ABS) }, 1039 .absbit = { BIT_MASK(ABS_Z) }, 1040 }, 1041 { 1042 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1043 INPUT_DEVICE_ID_MATCH_ABSBIT, 1044 .evbit = { BIT_MASK(EV_ABS) }, 1045 .absbit = { BIT_MASK(ABS_WHEEL) }, 1046 }, 1047 { 1048 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1049 INPUT_DEVICE_ID_MATCH_ABSBIT, 1050 .evbit = { BIT_MASK(EV_ABS) }, 1051 .absbit = { BIT_MASK(ABS_THROTTLE) }, 1052 }, 1053 { 1054 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1055 INPUT_DEVICE_ID_MATCH_KEYBIT, 1056 .evbit = { BIT_MASK(EV_KEY) }, 1057 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, 1058 }, 1059 { 1060 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1061 INPUT_DEVICE_ID_MATCH_KEYBIT, 1062 .evbit = { BIT_MASK(EV_KEY) }, 1063 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, 1064 }, 1065 { 1066 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1067 INPUT_DEVICE_ID_MATCH_KEYBIT, 1068 .evbit = { BIT_MASK(EV_KEY) }, 1069 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, 1070 }, 1071 { } /* Terminating entry */ 1072}; 1073 1074MODULE_DEVICE_TABLE(input, joydev_ids); 1075 1076static struct input_handler joydev_handler = { 1077 .event = joydev_event, 1078 .match = joydev_match, 1079 .connect = joydev_connect, 1080 .disconnect = joydev_disconnect, 1081 .legacy_minors = true, 1082 .minor = JOYDEV_MINOR_BASE, 1083 .name = "joydev", 1084 .id_table = joydev_ids, 1085}; 1086 1087static int __init joydev_init(void) 1088{ 1089 return input_register_handler(&joydev_handler); 1090} 1091 1092static void __exit joydev_exit(void) 1093{ 1094 input_unregister_handler(&joydev_handler); 1095} 1096 1097module_init(joydev_init); 1098module_exit(joydev_exit); 1099