1 /* 2 * Input driver to ExplorerPS/2 device driver module. 3 * 4 * Copyright (c) 1999-2002 Vojtech Pavlik 5 * Copyright (c) 2004 Dmitry Torokhov 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 version 2 as published by 9 * the Free Software Foundation. 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #define MOUSEDEV_MINOR_BASE 32 15 #define MOUSEDEV_MINORS 31 16 #define MOUSEDEV_MIX 63 17 18 #include <linux/bitops.h> 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/poll.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/input.h> 25 #include <linux/random.h> 26 #include <linux/major.h> 27 #include <linux/device.h> 28 #include <linux/cdev.h> 29 #include <linux/kernel.h> 30 31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 32 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 33 MODULE_LICENSE("GPL"); 34 35 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X 36 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 37 #endif 38 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y 39 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 40 #endif 41 42 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 43 module_param(xres, uint, 0644); 44 MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 45 46 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 47 module_param(yres, uint, 0644); 48 MODULE_PARM_DESC(yres, "Vertical screen resolution"); 49 50 static unsigned tap_time = 200; 51 module_param(tap_time, uint, 0644); 52 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 53 54 struct mousedev_hw_data { 55 int dx, dy, dz; 56 int x, y; 57 int abs_event; 58 unsigned long buttons; 59 }; 60 61 struct mousedev { 62 int open; 63 struct input_handle handle; 64 wait_queue_head_t wait; 65 struct list_head client_list; 66 spinlock_t client_lock; /* protects client_list */ 67 struct mutex mutex; 68 struct device dev; 69 struct cdev cdev; 70 bool exist; 71 72 struct list_head mixdev_node; 73 bool opened_by_mixdev; 74 75 struct mousedev_hw_data packet; 76 unsigned int pkt_count; 77 int old_x[4], old_y[4]; 78 int frac_dx, frac_dy; 79 unsigned long touch; 80 81 int (*open_device)(struct mousedev *mousedev); 82 void (*close_device)(struct mousedev *mousedev); 83 }; 84 85 enum mousedev_emul { 86 MOUSEDEV_EMUL_PS2, 87 MOUSEDEV_EMUL_IMPS, 88 MOUSEDEV_EMUL_EXPS 89 }; 90 91 struct mousedev_motion { 92 int dx, dy, dz; 93 unsigned long buttons; 94 }; 95 96 #define PACKET_QUEUE_LEN 16 97 struct mousedev_client { 98 struct fasync_struct *fasync; 99 struct mousedev *mousedev; 100 struct list_head node; 101 102 struct mousedev_motion packets[PACKET_QUEUE_LEN]; 103 unsigned int head, tail; 104 spinlock_t packet_lock; 105 int pos_x, pos_y; 106 107 u8 ps2[6]; 108 unsigned char ready, buffer, bufsiz; 109 unsigned char imexseq, impsseq; 110 enum mousedev_emul mode; 111 unsigned long last_buttons; 112 }; 113 114 #define MOUSEDEV_SEQ_LEN 6 115 116 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 117 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 118 119 static struct mousedev *mousedev_mix; 120 static LIST_HEAD(mousedev_mix_list); 121 122 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) 123 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) 124 125 static void mousedev_touchpad_event(struct input_dev *dev, 126 struct mousedev *mousedev, 127 unsigned int code, int value) 128 { 129 int size, tmp; 130 enum { FRACTION_DENOM = 128 }; 131 132 switch (code) { 133 134 case ABS_X: 135 136 fx(0) = value; 137 if (mousedev->touch && mousedev->pkt_count >= 2) { 138 size = input_abs_get_max(dev, ABS_X) - 139 input_abs_get_min(dev, ABS_X); 140 if (size == 0) 141 size = 256 * 2; 142 143 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; 144 tmp += mousedev->frac_dx; 145 mousedev->packet.dx = tmp / FRACTION_DENOM; 146 mousedev->frac_dx = 147 tmp - mousedev->packet.dx * FRACTION_DENOM; 148 } 149 break; 150 151 case ABS_Y: 152 fy(0) = value; 153 if (mousedev->touch && mousedev->pkt_count >= 2) { 154 /* use X size for ABS_Y to keep the same scale */ 155 size = input_abs_get_max(dev, ABS_X) - 156 input_abs_get_min(dev, ABS_X); 157 if (size == 0) 158 size = 256 * 2; 159 160 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; 161 tmp += mousedev->frac_dy; 162 mousedev->packet.dy = tmp / FRACTION_DENOM; 163 mousedev->frac_dy = tmp - 164 mousedev->packet.dy * FRACTION_DENOM; 165 } 166 break; 167 } 168 } 169 170 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, 171 unsigned int code, int value) 172 { 173 int min, max, size; 174 175 switch (code) { 176 177 case ABS_X: 178 min = input_abs_get_min(dev, ABS_X); 179 max = input_abs_get_max(dev, ABS_X); 180 181 size = max - min; 182 if (size == 0) 183 size = xres ? : 1; 184 185 value = clamp(value, min, max); 186 187 mousedev->packet.x = ((value - min) * xres) / size; 188 mousedev->packet.abs_event = 1; 189 break; 190 191 case ABS_Y: 192 min = input_abs_get_min(dev, ABS_Y); 193 max = input_abs_get_max(dev, ABS_Y); 194 195 size = max - min; 196 if (size == 0) 197 size = yres ? : 1; 198 199 value = clamp(value, min, max); 200 201 mousedev->packet.y = yres - ((value - min) * yres) / size; 202 mousedev->packet.abs_event = 1; 203 break; 204 } 205 } 206 207 static void mousedev_rel_event(struct mousedev *mousedev, 208 unsigned int code, int value) 209 { 210 switch (code) { 211 case REL_X: 212 mousedev->packet.dx += value; 213 break; 214 215 case REL_Y: 216 mousedev->packet.dy -= value; 217 break; 218 219 case REL_WHEEL: 220 mousedev->packet.dz -= value; 221 break; 222 } 223 } 224 225 static void mousedev_key_event(struct mousedev *mousedev, 226 unsigned int code, int value) 227 { 228 int index; 229 230 switch (code) { 231 232 case BTN_TOUCH: 233 case BTN_0: 234 case BTN_LEFT: index = 0; break; 235 236 case BTN_STYLUS: 237 case BTN_1: 238 case BTN_RIGHT: index = 1; break; 239 240 case BTN_2: 241 case BTN_FORWARD: 242 case BTN_STYLUS2: 243 case BTN_MIDDLE: index = 2; break; 244 245 case BTN_3: 246 case BTN_BACK: 247 case BTN_SIDE: index = 3; break; 248 249 case BTN_4: 250 case BTN_EXTRA: index = 4; break; 251 252 default: return; 253 } 254 255 if (value) { 256 set_bit(index, &mousedev->packet.buttons); 257 set_bit(index, &mousedev_mix->packet.buttons); 258 } else { 259 clear_bit(index, &mousedev->packet.buttons); 260 clear_bit(index, &mousedev_mix->packet.buttons); 261 } 262 } 263 264 static void mousedev_notify_readers(struct mousedev *mousedev, 265 struct mousedev_hw_data *packet) 266 { 267 struct mousedev_client *client; 268 struct mousedev_motion *p; 269 unsigned int new_head; 270 int wake_readers = 0; 271 272 rcu_read_lock(); 273 list_for_each_entry_rcu(client, &mousedev->client_list, node) { 274 275 /* Just acquire the lock, interrupts already disabled */ 276 spin_lock(&client->packet_lock); 277 278 p = &client->packets[client->head]; 279 if (client->ready && p->buttons != mousedev->packet.buttons) { 280 new_head = (client->head + 1) % PACKET_QUEUE_LEN; 281 if (new_head != client->tail) { 282 p = &client->packets[client->head = new_head]; 283 memset(p, 0, sizeof(struct mousedev_motion)); 284 } 285 } 286 287 if (packet->abs_event) { 288 p->dx += packet->x - client->pos_x; 289 p->dy += packet->y - client->pos_y; 290 client->pos_x = packet->x; 291 client->pos_y = packet->y; 292 } 293 294 client->pos_x += packet->dx; 295 client->pos_x = clamp_val(client->pos_x, 0, xres); 296 297 client->pos_y += packet->dy; 298 client->pos_y = clamp_val(client->pos_y, 0, yres); 299 300 p->dx += packet->dx; 301 p->dy += packet->dy; 302 p->dz += packet->dz; 303 p->buttons = mousedev->packet.buttons; 304 305 if (p->dx || p->dy || p->dz || 306 p->buttons != client->last_buttons) 307 client->ready = 1; 308 309 spin_unlock(&client->packet_lock); 310 311 if (client->ready) { 312 kill_fasync(&client->fasync, SIGIO, POLL_IN); 313 wake_readers = 1; 314 } 315 } 316 rcu_read_unlock(); 317 318 if (wake_readers) 319 wake_up_interruptible(&mousedev->wait); 320 } 321 322 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) 323 { 324 if (!value) { 325 if (mousedev->touch && 326 time_before(jiffies, 327 mousedev->touch + msecs_to_jiffies(tap_time))) { 328 /* 329 * Toggle left button to emulate tap. 330 * We rely on the fact that mousedev_mix always has 0 331 * motion packet so we won't mess current position. 332 */ 333 set_bit(0, &mousedev->packet.buttons); 334 set_bit(0, &mousedev_mix->packet.buttons); 335 mousedev_notify_readers(mousedev, &mousedev_mix->packet); 336 mousedev_notify_readers(mousedev_mix, 337 &mousedev_mix->packet); 338 clear_bit(0, &mousedev->packet.buttons); 339 clear_bit(0, &mousedev_mix->packet.buttons); 340 } 341 mousedev->touch = mousedev->pkt_count = 0; 342 mousedev->frac_dx = 0; 343 mousedev->frac_dy = 0; 344 345 } else if (!mousedev->touch) 346 mousedev->touch = jiffies; 347 } 348 349 static void mousedev_event(struct input_handle *handle, 350 unsigned int type, unsigned int code, int value) 351 { 352 struct mousedev *mousedev = handle->private; 353 354 switch (type) { 355 356 case EV_ABS: 357 /* Ignore joysticks */ 358 if (test_bit(BTN_TRIGGER, handle->dev->keybit)) 359 return; 360 361 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 362 mousedev_touchpad_event(handle->dev, 363 mousedev, code, value); 364 else 365 mousedev_abs_event(handle->dev, mousedev, code, value); 366 367 break; 368 369 case EV_REL: 370 mousedev_rel_event(mousedev, code, value); 371 break; 372 373 case EV_KEY: 374 if (value != 2) { 375 if (code == BTN_TOUCH && 376 test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 377 mousedev_touchpad_touch(mousedev, value); 378 else 379 mousedev_key_event(mousedev, code, value); 380 } 381 break; 382 383 case EV_SYN: 384 if (code == SYN_REPORT) { 385 if (mousedev->touch) { 386 mousedev->pkt_count++; 387 /* 388 * Input system eats duplicate events, 389 * but we need all of them to do correct 390 * averaging so apply present one forward 391 */ 392 fx(0) = fx(1); 393 fy(0) = fy(1); 394 } 395 396 mousedev_notify_readers(mousedev, &mousedev->packet); 397 mousedev_notify_readers(mousedev_mix, &mousedev->packet); 398 399 mousedev->packet.dx = mousedev->packet.dy = 400 mousedev->packet.dz = 0; 401 mousedev->packet.abs_event = 0; 402 } 403 break; 404 } 405 } 406 407 static int mousedev_fasync(int fd, struct file *file, int on) 408 { 409 struct mousedev_client *client = file->private_data; 410 411 return fasync_helper(fd, file, on, &client->fasync); 412 } 413 414 static void mousedev_free(struct device *dev) 415 { 416 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 417 418 input_put_device(mousedev->handle.dev); 419 kfree(mousedev); 420 } 421 422 static int mousedev_open_device(struct mousedev *mousedev) 423 { 424 int retval; 425 426 retval = mutex_lock_interruptible(&mousedev->mutex); 427 if (retval) 428 return retval; 429 430 if (!mousedev->exist) 431 retval = -ENODEV; 432 else if (!mousedev->open++) { 433 retval = input_open_device(&mousedev->handle); 434 if (retval) 435 mousedev->open--; 436 } 437 438 mutex_unlock(&mousedev->mutex); 439 return retval; 440 } 441 442 static void mousedev_close_device(struct mousedev *mousedev) 443 { 444 mutex_lock(&mousedev->mutex); 445 446 if (mousedev->exist && !--mousedev->open) 447 input_close_device(&mousedev->handle); 448 449 mutex_unlock(&mousedev->mutex); 450 } 451 452 /* 453 * Open all available devices so they can all be multiplexed in one. 454 * stream. Note that this function is called with mousedev_mix->mutex 455 * held. 456 */ 457 static int mixdev_open_devices(struct mousedev *mixdev) 458 { 459 int error; 460 461 error = mutex_lock_interruptible(&mixdev->mutex); 462 if (error) 463 return error; 464 465 if (!mixdev->open++) { 466 struct mousedev *mousedev; 467 468 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 469 if (!mousedev->opened_by_mixdev) { 470 if (mousedev_open_device(mousedev)) 471 continue; 472 473 mousedev->opened_by_mixdev = true; 474 } 475 } 476 } 477 478 mutex_unlock(&mixdev->mutex); 479 return 0; 480 } 481 482 /* 483 * Close all devices that were opened as part of multiplexed 484 * device. Note that this function is called with mousedev_mix->mutex 485 * held. 486 */ 487 static void mixdev_close_devices(struct mousedev *mixdev) 488 { 489 mutex_lock(&mixdev->mutex); 490 491 if (!--mixdev->open) { 492 struct mousedev *mousedev; 493 494 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 495 if (mousedev->opened_by_mixdev) { 496 mousedev->opened_by_mixdev = false; 497 mousedev_close_device(mousedev); 498 } 499 } 500 } 501 502 mutex_unlock(&mixdev->mutex); 503 } 504 505 506 static void mousedev_attach_client(struct mousedev *mousedev, 507 struct mousedev_client *client) 508 { 509 spin_lock(&mousedev->client_lock); 510 list_add_tail_rcu(&client->node, &mousedev->client_list); 511 spin_unlock(&mousedev->client_lock); 512 } 513 514 static void mousedev_detach_client(struct mousedev *mousedev, 515 struct mousedev_client *client) 516 { 517 spin_lock(&mousedev->client_lock); 518 list_del_rcu(&client->node); 519 spin_unlock(&mousedev->client_lock); 520 synchronize_rcu(); 521 } 522 523 static int mousedev_release(struct inode *inode, struct file *file) 524 { 525 struct mousedev_client *client = file->private_data; 526 struct mousedev *mousedev = client->mousedev; 527 528 mousedev_detach_client(mousedev, client); 529 kfree(client); 530 531 mousedev->close_device(mousedev); 532 533 return 0; 534 } 535 536 static int mousedev_open(struct inode *inode, struct file *file) 537 { 538 struct mousedev_client *client; 539 struct mousedev *mousedev; 540 int error; 541 542 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 543 if (imajor(inode) == MISC_MAJOR) 544 mousedev = mousedev_mix; 545 else 546 #endif 547 mousedev = container_of(inode->i_cdev, struct mousedev, cdev); 548 549 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 550 if (!client) 551 return -ENOMEM; 552 553 spin_lock_init(&client->packet_lock); 554 client->pos_x = xres / 2; 555 client->pos_y = yres / 2; 556 client->mousedev = mousedev; 557 mousedev_attach_client(mousedev, client); 558 559 error = mousedev->open_device(mousedev); 560 if (error) 561 goto err_free_client; 562 563 file->private_data = client; 564 nonseekable_open(inode, file); 565 566 return 0; 567 568 err_free_client: 569 mousedev_detach_client(mousedev, client); 570 kfree(client); 571 return error; 572 } 573 574 static void mousedev_packet(struct mousedev_client *client, u8 *ps2_data) 575 { 576 struct mousedev_motion *p = &client->packets[client->tail]; 577 s8 dx, dy, dz; 578 579 dx = clamp_val(p->dx, -127, 127); 580 p->dx -= dx; 581 582 dy = clamp_val(p->dy, -127, 127); 583 p->dy -= dy; 584 585 ps2_data[0] = BIT(3); 586 ps2_data[0] |= ((dx & BIT(7)) >> 3) | ((dy & BIT(7)) >> 2); 587 ps2_data[0] |= p->buttons & 0x07; 588 ps2_data[1] = dx; 589 ps2_data[2] = dy; 590 591 switch (client->mode) { 592 case MOUSEDEV_EMUL_EXPS: 593 dz = clamp_val(p->dz, -7, 7); 594 p->dz -= dz; 595 596 ps2_data[3] = (dz & 0x0f) | ((p->buttons & 0x18) << 1); 597 client->bufsiz = 4; 598 break; 599 600 case MOUSEDEV_EMUL_IMPS: 601 dz = clamp_val(p->dz, -127, 127); 602 p->dz -= dz; 603 604 ps2_data[0] |= ((p->buttons & 0x10) >> 3) | 605 ((p->buttons & 0x08) >> 1); 606 ps2_data[3] = dz; 607 608 client->bufsiz = 4; 609 break; 610 611 case MOUSEDEV_EMUL_PS2: 612 default: 613 p->dz = 0; 614 615 ps2_data[0] |= ((p->buttons & 0x10) >> 3) | 616 ((p->buttons & 0x08) >> 1); 617 618 client->bufsiz = 3; 619 break; 620 } 621 622 if (!p->dx && !p->dy && !p->dz) { 623 if (client->tail == client->head) { 624 client->ready = 0; 625 client->last_buttons = p->buttons; 626 } else 627 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 628 } 629 } 630 631 static void mousedev_generate_response(struct mousedev_client *client, 632 int command) 633 { 634 client->ps2[0] = 0xfa; /* ACK */ 635 636 switch (command) { 637 638 case 0xeb: /* Poll */ 639 mousedev_packet(client, &client->ps2[1]); 640 client->bufsiz++; /* account for leading ACK */ 641 break; 642 643 case 0xf2: /* Get ID */ 644 switch (client->mode) { 645 case MOUSEDEV_EMUL_PS2: 646 client->ps2[1] = 0; 647 break; 648 case MOUSEDEV_EMUL_IMPS: 649 client->ps2[1] = 3; 650 break; 651 case MOUSEDEV_EMUL_EXPS: 652 client->ps2[1] = 4; 653 break; 654 } 655 client->bufsiz = 2; 656 break; 657 658 case 0xe9: /* Get info */ 659 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 660 client->bufsiz = 4; 661 break; 662 663 case 0xff: /* Reset */ 664 client->impsseq = client->imexseq = 0; 665 client->mode = MOUSEDEV_EMUL_PS2; 666 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 667 client->bufsiz = 3; 668 break; 669 670 default: 671 client->bufsiz = 1; 672 break; 673 } 674 client->buffer = client->bufsiz; 675 } 676 677 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 678 size_t count, loff_t *ppos) 679 { 680 struct mousedev_client *client = file->private_data; 681 unsigned char c; 682 unsigned int i; 683 684 for (i = 0; i < count; i++) { 685 686 if (get_user(c, buffer + i)) 687 return -EFAULT; 688 689 spin_lock_irq(&client->packet_lock); 690 691 if (c == mousedev_imex_seq[client->imexseq]) { 692 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 693 client->imexseq = 0; 694 client->mode = MOUSEDEV_EMUL_EXPS; 695 } 696 } else 697 client->imexseq = 0; 698 699 if (c == mousedev_imps_seq[client->impsseq]) { 700 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 701 client->impsseq = 0; 702 client->mode = MOUSEDEV_EMUL_IMPS; 703 } 704 } else 705 client->impsseq = 0; 706 707 mousedev_generate_response(client, c); 708 709 spin_unlock_irq(&client->packet_lock); 710 } 711 712 kill_fasync(&client->fasync, SIGIO, POLL_IN); 713 wake_up_interruptible(&client->mousedev->wait); 714 715 return count; 716 } 717 718 static ssize_t mousedev_read(struct file *file, char __user *buffer, 719 size_t count, loff_t *ppos) 720 { 721 struct mousedev_client *client = file->private_data; 722 struct mousedev *mousedev = client->mousedev; 723 u8 data[sizeof(client->ps2)]; 724 int retval = 0; 725 726 if (!client->ready && !client->buffer && mousedev->exist && 727 (file->f_flags & O_NONBLOCK)) 728 return -EAGAIN; 729 730 retval = wait_event_interruptible(mousedev->wait, 731 !mousedev->exist || client->ready || client->buffer); 732 if (retval) 733 return retval; 734 735 if (!mousedev->exist) 736 return -ENODEV; 737 738 spin_lock_irq(&client->packet_lock); 739 740 if (!client->buffer && client->ready) { 741 mousedev_packet(client, client->ps2); 742 client->buffer = client->bufsiz; 743 } 744 745 if (count > client->buffer) 746 count = client->buffer; 747 748 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 749 client->buffer -= count; 750 751 spin_unlock_irq(&client->packet_lock); 752 753 if (copy_to_user(buffer, data, count)) 754 return -EFAULT; 755 756 return count; 757 } 758 759 /* No kernel lock - fine */ 760 static __poll_t mousedev_poll(struct file *file, poll_table *wait) 761 { 762 struct mousedev_client *client = file->private_data; 763 struct mousedev *mousedev = client->mousedev; 764 __poll_t mask; 765 766 poll_wait(file, &mousedev->wait, wait); 767 768 mask = mousedev->exist ? EPOLLOUT | EPOLLWRNORM : EPOLLHUP | EPOLLERR; 769 if (client->ready || client->buffer) 770 mask |= EPOLLIN | EPOLLRDNORM; 771 772 return mask; 773 } 774 775 static const struct file_operations mousedev_fops = { 776 .owner = THIS_MODULE, 777 .read = mousedev_read, 778 .write = mousedev_write, 779 .poll = mousedev_poll, 780 .open = mousedev_open, 781 .release = mousedev_release, 782 .fasync = mousedev_fasync, 783 .llseek = noop_llseek, 784 }; 785 786 /* 787 * Mark device non-existent. This disables writes, ioctls and 788 * prevents new users from opening the device. Already posted 789 * blocking reads will stay, however new ones will fail. 790 */ 791 static void mousedev_mark_dead(struct mousedev *mousedev) 792 { 793 mutex_lock(&mousedev->mutex); 794 mousedev->exist = false; 795 mutex_unlock(&mousedev->mutex); 796 } 797 798 /* 799 * Wake up users waiting for IO so they can disconnect from 800 * dead device. 801 */ 802 static void mousedev_hangup(struct mousedev *mousedev) 803 { 804 struct mousedev_client *client; 805 806 spin_lock(&mousedev->client_lock); 807 list_for_each_entry(client, &mousedev->client_list, node) 808 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 809 spin_unlock(&mousedev->client_lock); 810 811 wake_up_interruptible(&mousedev->wait); 812 } 813 814 static void mousedev_cleanup(struct mousedev *mousedev) 815 { 816 struct input_handle *handle = &mousedev->handle; 817 818 mousedev_mark_dead(mousedev); 819 mousedev_hangup(mousedev); 820 821 /* mousedev is marked dead so no one else accesses mousedev->open */ 822 if (mousedev->open) 823 input_close_device(handle); 824 } 825 826 static int mousedev_reserve_minor(bool mixdev) 827 { 828 int minor; 829 830 if (mixdev) { 831 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false); 832 if (minor < 0) 833 pr_err("failed to reserve mixdev minor: %d\n", minor); 834 } else { 835 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, 836 MOUSEDEV_MINORS, true); 837 if (minor < 0) 838 pr_err("failed to reserve new minor: %d\n", minor); 839 } 840 841 return minor; 842 } 843 844 static struct mousedev *mousedev_create(struct input_dev *dev, 845 struct input_handler *handler, 846 bool mixdev) 847 { 848 struct mousedev *mousedev; 849 int minor; 850 int error; 851 852 minor = mousedev_reserve_minor(mixdev); 853 if (minor < 0) { 854 error = minor; 855 goto err_out; 856 } 857 858 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 859 if (!mousedev) { 860 error = -ENOMEM; 861 goto err_free_minor; 862 } 863 864 INIT_LIST_HEAD(&mousedev->client_list); 865 INIT_LIST_HEAD(&mousedev->mixdev_node); 866 spin_lock_init(&mousedev->client_lock); 867 mutex_init(&mousedev->mutex); 868 lockdep_set_subclass(&mousedev->mutex, 869 mixdev ? SINGLE_DEPTH_NESTING : 0); 870 init_waitqueue_head(&mousedev->wait); 871 872 if (mixdev) { 873 dev_set_name(&mousedev->dev, "mice"); 874 875 mousedev->open_device = mixdev_open_devices; 876 mousedev->close_device = mixdev_close_devices; 877 } else { 878 int dev_no = minor; 879 /* Normalize device number if it falls into legacy range */ 880 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) 881 dev_no -= MOUSEDEV_MINOR_BASE; 882 dev_set_name(&mousedev->dev, "mouse%d", dev_no); 883 884 mousedev->open_device = mousedev_open_device; 885 mousedev->close_device = mousedev_close_device; 886 } 887 888 mousedev->exist = true; 889 mousedev->handle.dev = input_get_device(dev); 890 mousedev->handle.name = dev_name(&mousedev->dev); 891 mousedev->handle.handler = handler; 892 mousedev->handle.private = mousedev; 893 894 mousedev->dev.class = &input_class; 895 if (dev) 896 mousedev->dev.parent = &dev->dev; 897 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); 898 mousedev->dev.release = mousedev_free; 899 device_initialize(&mousedev->dev); 900 901 if (!mixdev) { 902 error = input_register_handle(&mousedev->handle); 903 if (error) 904 goto err_free_mousedev; 905 } 906 907 cdev_init(&mousedev->cdev, &mousedev_fops); 908 909 error = cdev_device_add(&mousedev->cdev, &mousedev->dev); 910 if (error) 911 goto err_cleanup_mousedev; 912 913 return mousedev; 914 915 err_cleanup_mousedev: 916 mousedev_cleanup(mousedev); 917 if (!mixdev) 918 input_unregister_handle(&mousedev->handle); 919 err_free_mousedev: 920 put_device(&mousedev->dev); 921 err_free_minor: 922 input_free_minor(minor); 923 err_out: 924 return ERR_PTR(error); 925 } 926 927 static void mousedev_destroy(struct mousedev *mousedev) 928 { 929 cdev_device_del(&mousedev->cdev, &mousedev->dev); 930 mousedev_cleanup(mousedev); 931 input_free_minor(MINOR(mousedev->dev.devt)); 932 if (mousedev != mousedev_mix) 933 input_unregister_handle(&mousedev->handle); 934 put_device(&mousedev->dev); 935 } 936 937 static int mixdev_add_device(struct mousedev *mousedev) 938 { 939 int retval; 940 941 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 942 if (retval) 943 return retval; 944 945 if (mousedev_mix->open) { 946 retval = mousedev_open_device(mousedev); 947 if (retval) 948 goto out; 949 950 mousedev->opened_by_mixdev = true; 951 } 952 953 get_device(&mousedev->dev); 954 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 955 956 out: 957 mutex_unlock(&mousedev_mix->mutex); 958 return retval; 959 } 960 961 static void mixdev_remove_device(struct mousedev *mousedev) 962 { 963 mutex_lock(&mousedev_mix->mutex); 964 965 if (mousedev->opened_by_mixdev) { 966 mousedev->opened_by_mixdev = false; 967 mousedev_close_device(mousedev); 968 } 969 970 list_del_init(&mousedev->mixdev_node); 971 mutex_unlock(&mousedev_mix->mutex); 972 973 put_device(&mousedev->dev); 974 } 975 976 static int mousedev_connect(struct input_handler *handler, 977 struct input_dev *dev, 978 const struct input_device_id *id) 979 { 980 struct mousedev *mousedev; 981 int error; 982 983 mousedev = mousedev_create(dev, handler, false); 984 if (IS_ERR(mousedev)) 985 return PTR_ERR(mousedev); 986 987 error = mixdev_add_device(mousedev); 988 if (error) { 989 mousedev_destroy(mousedev); 990 return error; 991 } 992 993 return 0; 994 } 995 996 static void mousedev_disconnect(struct input_handle *handle) 997 { 998 struct mousedev *mousedev = handle->private; 999 1000 mixdev_remove_device(mousedev); 1001 mousedev_destroy(mousedev); 1002 } 1003 1004 static const struct input_device_id mousedev_ids[] = { 1005 { 1006 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1007 INPUT_DEVICE_ID_MATCH_KEYBIT | 1008 INPUT_DEVICE_ID_MATCH_RELBIT, 1009 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1010 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1011 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1012 }, /* A mouse like device, at least one button, 1013 two relative axes */ 1014 { 1015 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1016 INPUT_DEVICE_ID_MATCH_RELBIT, 1017 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1018 .relbit = { BIT_MASK(REL_WHEEL) }, 1019 }, /* A separate scrollwheel */ 1020 { 1021 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1022 INPUT_DEVICE_ID_MATCH_KEYBIT | 1023 INPUT_DEVICE_ID_MATCH_ABSBIT, 1024 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1025 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1026 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1027 }, /* A tablet like device, at least touch detection, 1028 two absolute axes */ 1029 { 1030 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1031 INPUT_DEVICE_ID_MATCH_KEYBIT | 1032 INPUT_DEVICE_ID_MATCH_ABSBIT, 1033 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1034 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1035 BIT_MASK(BTN_TOOL_FINGER) }, 1036 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1037 BIT_MASK(ABS_PRESSURE) | 1038 BIT_MASK(ABS_TOOL_WIDTH) }, 1039 }, /* A touchpad */ 1040 { 1041 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1042 INPUT_DEVICE_ID_MATCH_KEYBIT | 1043 INPUT_DEVICE_ID_MATCH_ABSBIT, 1044 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1045 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1046 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1047 }, /* Mouse-like device with absolute X and Y but ordinary 1048 clicks, like hp ILO2 High Performance mouse */ 1049 1050 { }, /* Terminating entry */ 1051 }; 1052 1053 MODULE_DEVICE_TABLE(input, mousedev_ids); 1054 1055 static struct input_handler mousedev_handler = { 1056 .event = mousedev_event, 1057 .connect = mousedev_connect, 1058 .disconnect = mousedev_disconnect, 1059 .legacy_minors = true, 1060 .minor = MOUSEDEV_MINOR_BASE, 1061 .name = "mousedev", 1062 .id_table = mousedev_ids, 1063 }; 1064 1065 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1066 #include <linux/miscdevice.h> 1067 1068 static struct miscdevice psaux_mouse = { 1069 .minor = PSMOUSE_MINOR, 1070 .name = "psaux", 1071 .fops = &mousedev_fops, 1072 }; 1073 1074 static bool psaux_registered; 1075 1076 static void __init mousedev_psaux_register(void) 1077 { 1078 int error; 1079 1080 error = misc_register(&psaux_mouse); 1081 if (error) 1082 pr_warn("could not register psaux device, error: %d\n", 1083 error); 1084 else 1085 psaux_registered = true; 1086 } 1087 1088 static void __exit mousedev_psaux_unregister(void) 1089 { 1090 if (psaux_registered) 1091 misc_deregister(&psaux_mouse); 1092 } 1093 #else 1094 static inline void mousedev_psaux_register(void) { } 1095 static inline void mousedev_psaux_unregister(void) { } 1096 #endif 1097 1098 static int __init mousedev_init(void) 1099 { 1100 int error; 1101 1102 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true); 1103 if (IS_ERR(mousedev_mix)) 1104 return PTR_ERR(mousedev_mix); 1105 1106 error = input_register_handler(&mousedev_handler); 1107 if (error) { 1108 mousedev_destroy(mousedev_mix); 1109 return error; 1110 } 1111 1112 mousedev_psaux_register(); 1113 1114 pr_info("PS/2 mouse device common for all mice\n"); 1115 1116 return 0; 1117 } 1118 1119 static void __exit mousedev_exit(void) 1120 { 1121 mousedev_psaux_unregister(); 1122 input_unregister_handler(&mousedev_handler); 1123 mousedev_destroy(mousedev_mix); 1124 } 1125 1126 module_init(mousedev_init); 1127 module_exit(mousedev_exit); 1128