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/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 30MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 31MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 32MODULE_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 41static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 42module_param(xres, uint, 0644); 43MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 44 45static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 46module_param(yres, uint, 0644); 47MODULE_PARM_DESC(yres, "Vertical screen resolution"); 48 49static unsigned tap_time = 200; 50module_param(tap_time, uint, 0644); 51MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 52 53struct mousedev_hw_data { 54 int dx, dy, dz; 55 int x, y; 56 int abs_event; 57 unsigned long buttons; 58}; 59 60struct 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 71 struct list_head mixdev_node; 72 bool opened_by_mixdev; 73 74 struct mousedev_hw_data packet; 75 unsigned int pkt_count; 76 int old_x[4], old_y[4]; 77 int frac_dx, frac_dy; 78 unsigned long touch; 79 80 int (*open_device)(struct mousedev *mousedev); 81 void (*close_device)(struct mousedev *mousedev); 82}; 83 84enum mousedev_emul { 85 MOUSEDEV_EMUL_PS2, 86 MOUSEDEV_EMUL_IMPS, 87 MOUSEDEV_EMUL_EXPS 88}; 89 90struct mousedev_motion { 91 int dx, dy, dz; 92 unsigned long buttons; 93}; 94 95#define PACKET_QUEUE_LEN 16 96struct mousedev_client { 97 struct fasync_struct *fasync; 98 struct mousedev *mousedev; 99 struct list_head node; 100 101 struct mousedev_motion packets[PACKET_QUEUE_LEN]; 102 unsigned int head, tail; 103 spinlock_t packet_lock; 104 int pos_x, pos_y; 105 106 signed char ps2[6]; 107 unsigned char ready, buffer, bufsiz; 108 unsigned char imexseq, impsseq; 109 enum mousedev_emul mode; 110 unsigned long last_buttons; 111}; 112 113#define MOUSEDEV_SEQ_LEN 6 114 115static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 116static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 117 118static struct mousedev *mousedev_mix; 119static LIST_HEAD(mousedev_mix_list); 120 121#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) 122#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) 123 124static void mousedev_touchpad_event(struct input_dev *dev, 125 struct mousedev *mousedev, 126 unsigned int code, int value) 127{ 128 int size, tmp; 129 enum { FRACTION_DENOM = 128 }; 130 131 switch (code) { 132 133 case ABS_X: 134 135 fx(0) = value; 136 if (mousedev->touch && mousedev->pkt_count >= 2) { 137 size = input_abs_get_max(dev, ABS_X) - 138 input_abs_get_min(dev, ABS_X); 139 if (size == 0) 140 size = 256 * 2; 141 142 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; 143 tmp += mousedev->frac_dx; 144 mousedev->packet.dx = tmp / FRACTION_DENOM; 145 mousedev->frac_dx = 146 tmp - mousedev->packet.dx * FRACTION_DENOM; 147 } 148 break; 149 150 case ABS_Y: 151 fy(0) = value; 152 if (mousedev->touch && mousedev->pkt_count >= 2) { 153 /* use X size for ABS_Y to keep the same scale */ 154 size = input_abs_get_max(dev, ABS_X) - 155 input_abs_get_min(dev, ABS_X); 156 if (size == 0) 157 size = 256 * 2; 158 159 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; 160 tmp += mousedev->frac_dy; 161 mousedev->packet.dy = tmp / FRACTION_DENOM; 162 mousedev->frac_dy = tmp - 163 mousedev->packet.dy * FRACTION_DENOM; 164 } 165 break; 166 } 167} 168 169static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, 170 unsigned int code, int value) 171{ 172 int min, max, size; 173 174 switch (code) { 175 176 case ABS_X: 177 min = input_abs_get_min(dev, ABS_X); 178 max = input_abs_get_max(dev, ABS_X); 179 180 size = max - min; 181 if (size == 0) 182 size = xres ? : 1; 183 184 value = clamp(value, min, max); 185 186 mousedev->packet.x = ((value - min) * xres) / size; 187 mousedev->packet.abs_event = 1; 188 break; 189 190 case ABS_Y: 191 min = input_abs_get_min(dev, ABS_Y); 192 max = input_abs_get_max(dev, ABS_Y); 193 194 size = max - min; 195 if (size == 0) 196 size = yres ? : 1; 197 198 value = clamp(value, min, max); 199 200 mousedev->packet.y = yres - ((value - min) * yres) / size; 201 mousedev->packet.abs_event = 1; 202 break; 203 } 204} 205 206static void mousedev_rel_event(struct mousedev *mousedev, 207 unsigned int code, int value) 208{ 209 switch (code) { 210 case REL_X: 211 mousedev->packet.dx += value; 212 break; 213 214 case REL_Y: 215 mousedev->packet.dy -= value; 216 break; 217 218 case REL_WHEEL: 219 mousedev->packet.dz -= value; 220 break; 221 } 222} 223 224static void mousedev_key_event(struct mousedev *mousedev, 225 unsigned int code, int value) 226{ 227 int index; 228 229 switch (code) { 230 231 case BTN_TOUCH: 232 case BTN_0: 233 case BTN_LEFT: index = 0; break; 234 235 case BTN_STYLUS: 236 case BTN_1: 237 case BTN_RIGHT: index = 1; break; 238 239 case BTN_2: 240 case BTN_FORWARD: 241 case BTN_STYLUS2: 242 case BTN_MIDDLE: index = 2; break; 243 244 case BTN_3: 245 case BTN_BACK: 246 case BTN_SIDE: index = 3; break; 247 248 case BTN_4: 249 case BTN_EXTRA: index = 4; break; 250 251 default: return; 252 } 253 254 if (value) { 255 set_bit(index, &mousedev->packet.buttons); 256 set_bit(index, &mousedev_mix->packet.buttons); 257 } else { 258 clear_bit(index, &mousedev->packet.buttons); 259 clear_bit(index, &mousedev_mix->packet.buttons); 260 } 261} 262 263static void mousedev_notify_readers(struct mousedev *mousedev, 264 struct mousedev_hw_data *packet) 265{ 266 struct mousedev_client *client; 267 struct mousedev_motion *p; 268 unsigned int new_head; 269 int wake_readers = 0; 270 271 rcu_read_lock(); 272 list_for_each_entry_rcu(client, &mousedev->client_list, node) { 273 274 /* Just acquire the lock, interrupts already disabled */ 275 spin_lock(&client->packet_lock); 276 277 p = &client->packets[client->head]; 278 if (client->ready && p->buttons != mousedev->packet.buttons) { 279 new_head = (client->head + 1) % PACKET_QUEUE_LEN; 280 if (new_head != client->tail) { 281 p = &client->packets[client->head = new_head]; 282 memset(p, 0, sizeof(struct mousedev_motion)); 283 } 284 } 285 286 if (packet->abs_event) { 287 p->dx += packet->x - client->pos_x; 288 p->dy += packet->y - client->pos_y; 289 client->pos_x = packet->x; 290 client->pos_y = packet->y; 291 } 292 293 client->pos_x += packet->dx; 294 client->pos_x = client->pos_x < 0 ? 295 0 : (client->pos_x >= xres ? xres : client->pos_x); 296 client->pos_y += packet->dy; 297 client->pos_y = client->pos_y < 0 ? 298 0 : (client->pos_y >= yres ? yres : client->pos_y); 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 322static 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 349static 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 407static 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 414static 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 422static 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 442static 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 */ 457static 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 */ 487static 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 506static 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 514static 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 523static 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 536static 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 574static inline int mousedev_limit_delta(int delta, int limit) 575{ 576 return delta > limit ? limit : (delta < -limit ? -limit : delta); 577} 578 579static void mousedev_packet(struct mousedev_client *client, 580 signed char *ps2_data) 581{ 582 struct mousedev_motion *p = &client->packets[client->tail]; 583 584 ps2_data[0] = 0x08 | 585 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 586 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 587 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 588 p->dx -= ps2_data[1]; 589 p->dy -= ps2_data[2]; 590 591 switch (client->mode) { 592 case MOUSEDEV_EMUL_EXPS: 593 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 594 p->dz -= ps2_data[3]; 595 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 596 client->bufsiz = 4; 597 break; 598 599 case MOUSEDEV_EMUL_IMPS: 600 ps2_data[0] |= 601 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 602 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 603 p->dz -= ps2_data[3]; 604 client->bufsiz = 4; 605 break; 606 607 case MOUSEDEV_EMUL_PS2: 608 default: 609 ps2_data[0] |= 610 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 611 p->dz = 0; 612 client->bufsiz = 3; 613 break; 614 } 615 616 if (!p->dx && !p->dy && !p->dz) { 617 if (client->tail == client->head) { 618 client->ready = 0; 619 client->last_buttons = p->buttons; 620 } else 621 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 622 } 623} 624 625static void mousedev_generate_response(struct mousedev_client *client, 626 int command) 627{ 628 client->ps2[0] = 0xfa; /* ACK */ 629 630 switch (command) { 631 632 case 0xeb: /* Poll */ 633 mousedev_packet(client, &client->ps2[1]); 634 client->bufsiz++; /* account for leading ACK */ 635 break; 636 637 case 0xf2: /* Get ID */ 638 switch (client->mode) { 639 case MOUSEDEV_EMUL_PS2: 640 client->ps2[1] = 0; 641 break; 642 case MOUSEDEV_EMUL_IMPS: 643 client->ps2[1] = 3; 644 break; 645 case MOUSEDEV_EMUL_EXPS: 646 client->ps2[1] = 4; 647 break; 648 } 649 client->bufsiz = 2; 650 break; 651 652 case 0xe9: /* Get info */ 653 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 654 client->bufsiz = 4; 655 break; 656 657 case 0xff: /* Reset */ 658 client->impsseq = client->imexseq = 0; 659 client->mode = MOUSEDEV_EMUL_PS2; 660 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 661 client->bufsiz = 3; 662 break; 663 664 default: 665 client->bufsiz = 1; 666 break; 667 } 668 client->buffer = client->bufsiz; 669} 670 671static ssize_t mousedev_write(struct file *file, const char __user *buffer, 672 size_t count, loff_t *ppos) 673{ 674 struct mousedev_client *client = file->private_data; 675 unsigned char c; 676 unsigned int i; 677 678 for (i = 0; i < count; i++) { 679 680 if (get_user(c, buffer + i)) 681 return -EFAULT; 682 683 spin_lock_irq(&client->packet_lock); 684 685 if (c == mousedev_imex_seq[client->imexseq]) { 686 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 687 client->imexseq = 0; 688 client->mode = MOUSEDEV_EMUL_EXPS; 689 } 690 } else 691 client->imexseq = 0; 692 693 if (c == mousedev_imps_seq[client->impsseq]) { 694 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 695 client->impsseq = 0; 696 client->mode = MOUSEDEV_EMUL_IMPS; 697 } 698 } else 699 client->impsseq = 0; 700 701 mousedev_generate_response(client, c); 702 703 spin_unlock_irq(&client->packet_lock); 704 } 705 706 kill_fasync(&client->fasync, SIGIO, POLL_IN); 707 wake_up_interruptible(&client->mousedev->wait); 708 709 return count; 710} 711 712static ssize_t mousedev_read(struct file *file, char __user *buffer, 713 size_t count, loff_t *ppos) 714{ 715 struct mousedev_client *client = file->private_data; 716 struct mousedev *mousedev = client->mousedev; 717 signed char data[sizeof(client->ps2)]; 718 int retval = 0; 719 720 if (!client->ready && !client->buffer && mousedev->exist && 721 (file->f_flags & O_NONBLOCK)) 722 return -EAGAIN; 723 724 retval = wait_event_interruptible(mousedev->wait, 725 !mousedev->exist || client->ready || client->buffer); 726 if (retval) 727 return retval; 728 729 if (!mousedev->exist) 730 return -ENODEV; 731 732 spin_lock_irq(&client->packet_lock); 733 734 if (!client->buffer && client->ready) { 735 mousedev_packet(client, client->ps2); 736 client->buffer = client->bufsiz; 737 } 738 739 if (count > client->buffer) 740 count = client->buffer; 741 742 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 743 client->buffer -= count; 744 745 spin_unlock_irq(&client->packet_lock); 746 747 if (copy_to_user(buffer, data, count)) 748 return -EFAULT; 749 750 return count; 751} 752 753/* No kernel lock - fine */ 754static unsigned int mousedev_poll(struct file *file, poll_table *wait) 755{ 756 struct mousedev_client *client = file->private_data; 757 struct mousedev *mousedev = client->mousedev; 758 unsigned int mask; 759 760 poll_wait(file, &mousedev->wait, wait); 761 762 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 763 if (client->ready || client->buffer) 764 mask |= POLLIN | POLLRDNORM; 765 766 return mask; 767} 768 769static const struct file_operations mousedev_fops = { 770 .owner = THIS_MODULE, 771 .read = mousedev_read, 772 .write = mousedev_write, 773 .poll = mousedev_poll, 774 .open = mousedev_open, 775 .release = mousedev_release, 776 .fasync = mousedev_fasync, 777 .llseek = noop_llseek, 778}; 779 780/* 781 * Mark device non-existent. This disables writes, ioctls and 782 * prevents new users from opening the device. Already posted 783 * blocking reads will stay, however new ones will fail. 784 */ 785static void mousedev_mark_dead(struct mousedev *mousedev) 786{ 787 mutex_lock(&mousedev->mutex); 788 mousedev->exist = false; 789 mutex_unlock(&mousedev->mutex); 790} 791 792/* 793 * Wake up users waiting for IO so they can disconnect from 794 * dead device. 795 */ 796static void mousedev_hangup(struct mousedev *mousedev) 797{ 798 struct mousedev_client *client; 799 800 spin_lock(&mousedev->client_lock); 801 list_for_each_entry(client, &mousedev->client_list, node) 802 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 803 spin_unlock(&mousedev->client_lock); 804 805 wake_up_interruptible(&mousedev->wait); 806} 807 808static void mousedev_cleanup(struct mousedev *mousedev) 809{ 810 struct input_handle *handle = &mousedev->handle; 811 812 mousedev_mark_dead(mousedev); 813 mousedev_hangup(mousedev); 814 815 cdev_del(&mousedev->cdev); 816 817 /* mousedev is marked dead so no one else accesses mousedev->open */ 818 if (mousedev->open) 819 input_close_device(handle); 820} 821 822static int mousedev_reserve_minor(bool mixdev) 823{ 824 int minor; 825 826 if (mixdev) { 827 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false); 828 if (minor < 0) 829 pr_err("failed to reserve mixdev minor: %d\n", minor); 830 } else { 831 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, 832 MOUSEDEV_MINORS, true); 833 if (minor < 0) 834 pr_err("failed to reserve new minor: %d\n", minor); 835 } 836 837 return minor; 838} 839 840static struct mousedev *mousedev_create(struct input_dev *dev, 841 struct input_handler *handler, 842 bool mixdev) 843{ 844 struct mousedev *mousedev; 845 int minor; 846 int error; 847 848 minor = mousedev_reserve_minor(mixdev); 849 if (minor < 0) { 850 error = minor; 851 goto err_out; 852 } 853 854 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 855 if (!mousedev) { 856 error = -ENOMEM; 857 goto err_free_minor; 858 } 859 860 INIT_LIST_HEAD(&mousedev->client_list); 861 INIT_LIST_HEAD(&mousedev->mixdev_node); 862 spin_lock_init(&mousedev->client_lock); 863 mutex_init(&mousedev->mutex); 864 lockdep_set_subclass(&mousedev->mutex, 865 mixdev ? SINGLE_DEPTH_NESTING : 0); 866 init_waitqueue_head(&mousedev->wait); 867 868 if (mixdev) { 869 dev_set_name(&mousedev->dev, "mice"); 870 871 mousedev->open_device = mixdev_open_devices; 872 mousedev->close_device = mixdev_close_devices; 873 } else { 874 int dev_no = minor; 875 /* Normalize device number if it falls into legacy range */ 876 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) 877 dev_no -= MOUSEDEV_MINOR_BASE; 878 dev_set_name(&mousedev->dev, "mouse%d", dev_no); 879 880 mousedev->open_device = mousedev_open_device; 881 mousedev->close_device = mousedev_close_device; 882 } 883 884 mousedev->exist = true; 885 mousedev->handle.dev = input_get_device(dev); 886 mousedev->handle.name = dev_name(&mousedev->dev); 887 mousedev->handle.handler = handler; 888 mousedev->handle.private = mousedev; 889 890 mousedev->dev.class = &input_class; 891 if (dev) 892 mousedev->dev.parent = &dev->dev; 893 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); 894 mousedev->dev.release = mousedev_free; 895 device_initialize(&mousedev->dev); 896 897 if (!mixdev) { 898 error = input_register_handle(&mousedev->handle); 899 if (error) 900 goto err_free_mousedev; 901 } 902 903 cdev_init(&mousedev->cdev, &mousedev_fops); 904 mousedev->cdev.kobj.parent = &mousedev->dev.kobj; 905 error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1); 906 if (error) 907 goto err_unregister_handle; 908 909 error = device_add(&mousedev->dev); 910 if (error) 911 goto err_cleanup_mousedev; 912 913 return mousedev; 914 915 err_cleanup_mousedev: 916 mousedev_cleanup(mousedev); 917 err_unregister_handle: 918 if (!mixdev) 919 input_unregister_handle(&mousedev->handle); 920 err_free_mousedev: 921 put_device(&mousedev->dev); 922 err_free_minor: 923 input_free_minor(minor); 924 err_out: 925 return ERR_PTR(error); 926} 927 928static void mousedev_destroy(struct mousedev *mousedev) 929{ 930 device_del(&mousedev->dev); 931 mousedev_cleanup(mousedev); 932 input_free_minor(MINOR(mousedev->dev.devt)); 933 if (mousedev != mousedev_mix) 934 input_unregister_handle(&mousedev->handle); 935 put_device(&mousedev->dev); 936} 937 938static int mixdev_add_device(struct mousedev *mousedev) 939{ 940 int retval; 941 942 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 943 if (retval) 944 return retval; 945 946 if (mousedev_mix->open) { 947 retval = mousedev_open_device(mousedev); 948 if (retval) 949 goto out; 950 951 mousedev->opened_by_mixdev = true; 952 } 953 954 get_device(&mousedev->dev); 955 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 956 957 out: 958 mutex_unlock(&mousedev_mix->mutex); 959 return retval; 960} 961 962static void mixdev_remove_device(struct mousedev *mousedev) 963{ 964 mutex_lock(&mousedev_mix->mutex); 965 966 if (mousedev->opened_by_mixdev) { 967 mousedev->opened_by_mixdev = false; 968 mousedev_close_device(mousedev); 969 } 970 971 list_del_init(&mousedev->mixdev_node); 972 mutex_unlock(&mousedev_mix->mutex); 973 974 put_device(&mousedev->dev); 975} 976 977static int mousedev_connect(struct input_handler *handler, 978 struct input_dev *dev, 979 const struct input_device_id *id) 980{ 981 struct mousedev *mousedev; 982 int error; 983 984 mousedev = mousedev_create(dev, handler, false); 985 if (IS_ERR(mousedev)) 986 return PTR_ERR(mousedev); 987 988 error = mixdev_add_device(mousedev); 989 if (error) { 990 mousedev_destroy(mousedev); 991 return error; 992 } 993 994 return 0; 995} 996 997static void mousedev_disconnect(struct input_handle *handle) 998{ 999 struct mousedev *mousedev = handle->private; 1000 1001 mixdev_remove_device(mousedev); 1002 mousedev_destroy(mousedev); 1003} 1004 1005static const struct input_device_id mousedev_ids[] = { 1006 { 1007 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1008 INPUT_DEVICE_ID_MATCH_KEYBIT | 1009 INPUT_DEVICE_ID_MATCH_RELBIT, 1010 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1011 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1012 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1013 }, /* A mouse like device, at least one button, 1014 two relative axes */ 1015 { 1016 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1017 INPUT_DEVICE_ID_MATCH_RELBIT, 1018 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1019 .relbit = { BIT_MASK(REL_WHEEL) }, 1020 }, /* A separate scrollwheel */ 1021 { 1022 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1023 INPUT_DEVICE_ID_MATCH_KEYBIT | 1024 INPUT_DEVICE_ID_MATCH_ABSBIT, 1025 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1026 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1027 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1028 }, /* A tablet like device, at least touch detection, 1029 two absolute axes */ 1030 { 1031 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1032 INPUT_DEVICE_ID_MATCH_KEYBIT | 1033 INPUT_DEVICE_ID_MATCH_ABSBIT, 1034 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1035 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1036 BIT_MASK(BTN_TOOL_FINGER) }, 1037 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1038 BIT_MASK(ABS_PRESSURE) | 1039 BIT_MASK(ABS_TOOL_WIDTH) }, 1040 }, /* A touchpad */ 1041 { 1042 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1043 INPUT_DEVICE_ID_MATCH_KEYBIT | 1044 INPUT_DEVICE_ID_MATCH_ABSBIT, 1045 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1046 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1047 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1048 }, /* Mouse-like device with absolute X and Y but ordinary 1049 clicks, like hp ILO2 High Performance mouse */ 1050 1051 { }, /* Terminating entry */ 1052}; 1053 1054MODULE_DEVICE_TABLE(input, mousedev_ids); 1055 1056static struct input_handler mousedev_handler = { 1057 .event = mousedev_event, 1058 .connect = mousedev_connect, 1059 .disconnect = mousedev_disconnect, 1060 .legacy_minors = true, 1061 .minor = MOUSEDEV_MINOR_BASE, 1062 .name = "mousedev", 1063 .id_table = mousedev_ids, 1064}; 1065 1066#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1067#include <linux/miscdevice.h> 1068 1069static struct miscdevice psaux_mouse = { 1070 .minor = PSMOUSE_MINOR, 1071 .name = "psaux", 1072 .fops = &mousedev_fops, 1073}; 1074 1075static bool psaux_registered; 1076 1077static void __init mousedev_psaux_register(void) 1078{ 1079 int error; 1080 1081 error = misc_register(&psaux_mouse); 1082 if (error) 1083 pr_warn("could not register psaux device, error: %d\n", 1084 error); 1085 else 1086 psaux_registered = true; 1087} 1088 1089static void __exit mousedev_psaux_unregister(void) 1090{ 1091 if (psaux_registered) 1092 misc_deregister(&psaux_mouse); 1093} 1094#else 1095static inline void mousedev_psaux_register(void) { } 1096static inline void mousedev_psaux_unregister(void) { } 1097#endif 1098 1099static int __init mousedev_init(void) 1100{ 1101 int error; 1102 1103 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true); 1104 if (IS_ERR(mousedev_mix)) 1105 return PTR_ERR(mousedev_mix); 1106 1107 error = input_register_handler(&mousedev_handler); 1108 if (error) { 1109 mousedev_destroy(mousedev_mix); 1110 return error; 1111 } 1112 1113 mousedev_psaux_register(); 1114 1115 pr_info("PS/2 mouse device common for all mice\n"); 1116 1117 return 0; 1118} 1119 1120static void __exit mousedev_exit(void) 1121{ 1122 mousedev_psaux_unregister(); 1123 input_unregister_handler(&mousedev_handler); 1124 mousedev_destroy(mousedev_mix); 1125} 1126 1127module_init(mousedev_init); 1128module_exit(mousedev_exit); 1129