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