mousedev.c revision 4a215aade0baa0487d4644d7aef6f166c84c516e
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 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 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 82enum mousedev_emul { 83 MOUSEDEV_EMUL_PS2, 84 MOUSEDEV_EMUL_IMPS, 85 MOUSEDEV_EMUL_EXPS 86}; 87 88struct mousedev_motion { 89 int dx, dy, dz; 90 unsigned long buttons; 91}; 92 93#define PACKET_QUEUE_LEN 16 94struct 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 113static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 114static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 115 116static struct mousedev *mousedev_mix; 117static LIST_HEAD(mousedev_mix_list); 118 119static void mixdev_open_devices(void); 120static 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 125static 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 170static 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 207static 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 225static 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 264static 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 323static 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 350static 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 408static 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 415static 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 423static 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 445static 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 */ 462static 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 */ 484static 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 500static 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 508static 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 517static 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); 526 527 return 0; 528} 529 530static int mousedev_open(struct inode *inode, struct file *file) 531{ 532 struct mousedev_client *client; 533 struct mousedev *mousedev; 534 int error; 535 536#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 537 if (imajor(inode) == MISC_MAJOR) 538 mousedev = mousedev_mix; 539 else 540#endif 541 mousedev = container_of(inode->i_cdev, struct mousedev, cdev); 542 543 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 544 if (!client) 545 return -ENOMEM; 546 547 spin_lock_init(&client->packet_lock); 548 client->pos_x = xres / 2; 549 client->pos_y = yres / 2; 550 client->mousedev = mousedev; 551 mousedev_attach_client(mousedev, client); 552 553 error = mousedev_open_device(mousedev); 554 if (error) 555 goto err_free_client; 556 557 file->private_data = client; 558 nonseekable_open(inode, file); 559 560 return 0; 561 562 err_free_client: 563 mousedev_detach_client(mousedev, client); 564 kfree(client); 565 return error; 566} 567 568static inline int mousedev_limit_delta(int delta, int limit) 569{ 570 return delta > limit ? limit : (delta < -limit ? -limit : delta); 571} 572 573static void mousedev_packet(struct mousedev_client *client, 574 signed char *ps2_data) 575{ 576 struct mousedev_motion *p = &client->packets[client->tail]; 577 578 ps2_data[0] = 0x08 | 579 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 580 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 581 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 582 p->dx -= ps2_data[1]; 583 p->dy -= ps2_data[2]; 584 585 switch (client->mode) { 586 case MOUSEDEV_EMUL_EXPS: 587 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 588 p->dz -= ps2_data[3]; 589 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 590 client->bufsiz = 4; 591 break; 592 593 case MOUSEDEV_EMUL_IMPS: 594 ps2_data[0] |= 595 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 596 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 597 p->dz -= ps2_data[3]; 598 client->bufsiz = 4; 599 break; 600 601 case MOUSEDEV_EMUL_PS2: 602 default: 603 ps2_data[0] |= 604 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 605 p->dz = 0; 606 client->bufsiz = 3; 607 break; 608 } 609 610 if (!p->dx && !p->dy && !p->dz) { 611 if (client->tail == client->head) { 612 client->ready = 0; 613 client->last_buttons = p->buttons; 614 } else 615 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 616 } 617} 618 619static void mousedev_generate_response(struct mousedev_client *client, 620 int command) 621{ 622 client->ps2[0] = 0xfa; /* ACK */ 623 624 switch (command) { 625 626 case 0xeb: /* Poll */ 627 mousedev_packet(client, &client->ps2[1]); 628 client->bufsiz++; /* account for leading ACK */ 629 break; 630 631 case 0xf2: /* Get ID */ 632 switch (client->mode) { 633 case MOUSEDEV_EMUL_PS2: 634 client->ps2[1] = 0; 635 break; 636 case MOUSEDEV_EMUL_IMPS: 637 client->ps2[1] = 3; 638 break; 639 case MOUSEDEV_EMUL_EXPS: 640 client->ps2[1] = 4; 641 break; 642 } 643 client->bufsiz = 2; 644 break; 645 646 case 0xe9: /* Get info */ 647 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 648 client->bufsiz = 4; 649 break; 650 651 case 0xff: /* Reset */ 652 client->impsseq = client->imexseq = 0; 653 client->mode = MOUSEDEV_EMUL_PS2; 654 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 655 client->bufsiz = 3; 656 break; 657 658 default: 659 client->bufsiz = 1; 660 break; 661 } 662 client->buffer = client->bufsiz; 663} 664 665static ssize_t mousedev_write(struct file *file, const char __user *buffer, 666 size_t count, loff_t *ppos) 667{ 668 struct mousedev_client *client = file->private_data; 669 unsigned char c; 670 unsigned int i; 671 672 for (i = 0; i < count; i++) { 673 674 if (get_user(c, buffer + i)) 675 return -EFAULT; 676 677 spin_lock_irq(&client->packet_lock); 678 679 if (c == mousedev_imex_seq[client->imexseq]) { 680 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 681 client->imexseq = 0; 682 client->mode = MOUSEDEV_EMUL_EXPS; 683 } 684 } else 685 client->imexseq = 0; 686 687 if (c == mousedev_imps_seq[client->impsseq]) { 688 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 689 client->impsseq = 0; 690 client->mode = MOUSEDEV_EMUL_IMPS; 691 } 692 } else 693 client->impsseq = 0; 694 695 mousedev_generate_response(client, c); 696 697 spin_unlock_irq(&client->packet_lock); 698 } 699 700 kill_fasync(&client->fasync, SIGIO, POLL_IN); 701 wake_up_interruptible(&client->mousedev->wait); 702 703 return count; 704} 705 706static ssize_t mousedev_read(struct file *file, char __user *buffer, 707 size_t count, loff_t *ppos) 708{ 709 struct mousedev_client *client = file->private_data; 710 struct mousedev *mousedev = client->mousedev; 711 signed char data[sizeof(client->ps2)]; 712 int retval = 0; 713 714 if (!client->ready && !client->buffer && mousedev->exist && 715 (file->f_flags & O_NONBLOCK)) 716 return -EAGAIN; 717 718 retval = wait_event_interruptible(mousedev->wait, 719 !mousedev->exist || client->ready || client->buffer); 720 if (retval) 721 return retval; 722 723 if (!mousedev->exist) 724 return -ENODEV; 725 726 spin_lock_irq(&client->packet_lock); 727 728 if (!client->buffer && client->ready) { 729 mousedev_packet(client, client->ps2); 730 client->buffer = client->bufsiz; 731 } 732 733 if (count > client->buffer) 734 count = client->buffer; 735 736 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 737 client->buffer -= count; 738 739 spin_unlock_irq(&client->packet_lock); 740 741 if (copy_to_user(buffer, data, count)) 742 return -EFAULT; 743 744 return count; 745} 746 747/* No kernel lock - fine */ 748static unsigned int mousedev_poll(struct file *file, poll_table *wait) 749{ 750 struct mousedev_client *client = file->private_data; 751 struct mousedev *mousedev = client->mousedev; 752 unsigned int mask; 753 754 poll_wait(file, &mousedev->wait, wait); 755 756 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 757 if (client->ready || client->buffer) 758 mask |= POLLIN | POLLRDNORM; 759 760 return mask; 761} 762 763static const struct file_operations mousedev_fops = { 764 .owner = THIS_MODULE, 765 .read = mousedev_read, 766 .write = mousedev_write, 767 .poll = mousedev_poll, 768 .open = mousedev_open, 769 .release = mousedev_release, 770 .fasync = mousedev_fasync, 771 .llseek = noop_llseek, 772}; 773 774/* 775 * Mark device non-existent. This disables writes, ioctls and 776 * prevents new users from opening the device. Already posted 777 * blocking reads will stay, however new ones will fail. 778 */ 779static void mousedev_mark_dead(struct mousedev *mousedev) 780{ 781 mutex_lock(&mousedev->mutex); 782 mousedev->exist = false; 783 mutex_unlock(&mousedev->mutex); 784} 785 786/* 787 * Wake up users waiting for IO so they can disconnect from 788 * dead device. 789 */ 790static void mousedev_hangup(struct mousedev *mousedev) 791{ 792 struct mousedev_client *client; 793 794 spin_lock(&mousedev->client_lock); 795 list_for_each_entry(client, &mousedev->client_list, node) 796 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 797 spin_unlock(&mousedev->client_lock); 798 799 wake_up_interruptible(&mousedev->wait); 800} 801 802static void mousedev_cleanup(struct mousedev *mousedev) 803{ 804 struct input_handle *handle = &mousedev->handle; 805 806 mousedev_mark_dead(mousedev); 807 mousedev_hangup(mousedev); 808 809 cdev_del(&mousedev->cdev); 810 811 /* mousedev is marked dead so no one else accesses mousedev->open */ 812 if (mousedev->open) 813 input_close_device(handle); 814} 815 816static int mousedev_reserve_minor(bool mixdev) 817{ 818 int minor; 819 820 if (mixdev) { 821 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false); 822 if (minor < 0) 823 pr_err("failed to reserve mixdev minor: %d\n", minor); 824 } else { 825 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE, 826 MOUSEDEV_MINORS, true); 827 if (minor < 0) 828 pr_err("failed to reserve new minor: %d\n", minor); 829 } 830 831 return minor; 832} 833 834static struct mousedev *mousedev_create(struct input_dev *dev, 835 struct input_handler *handler, 836 bool mixdev) 837{ 838 struct mousedev *mousedev; 839 int minor; 840 int error; 841 842 minor = mousedev_reserve_minor(mixdev); 843 if (minor < 0) { 844 error = minor; 845 goto err_out; 846 } 847 848 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 849 if (!mousedev) { 850 error = -ENOMEM; 851 goto err_free_minor; 852 } 853 854 INIT_LIST_HEAD(&mousedev->client_list); 855 INIT_LIST_HEAD(&mousedev->mixdev_node); 856 spin_lock_init(&mousedev->client_lock); 857 mutex_init(&mousedev->mutex); 858 lockdep_set_subclass(&mousedev->mutex, 859 mixdev ? SINGLE_DEPTH_NESTING : 0); 860 init_waitqueue_head(&mousedev->wait); 861 862 if (mixdev) { 863 dev_set_name(&mousedev->dev, "mice"); 864 } else { 865 int dev_no = minor; 866 /* Normalize device number if it falls into legacy range */ 867 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS) 868 dev_no -= MOUSEDEV_MINOR_BASE; 869 dev_set_name(&mousedev->dev, "mouse%d", dev_no); 870 } 871 872 mousedev->exist = true; 873 mousedev->is_mixdev = mixdev; 874 mousedev->handle.dev = input_get_device(dev); 875 mousedev->handle.name = dev_name(&mousedev->dev); 876 mousedev->handle.handler = handler; 877 mousedev->handle.private = mousedev; 878 879 mousedev->dev.class = &input_class; 880 if (dev) 881 mousedev->dev.parent = &dev->dev; 882 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor); 883 mousedev->dev.release = mousedev_free; 884 device_initialize(&mousedev->dev); 885 886 if (!mixdev) { 887 error = input_register_handle(&mousedev->handle); 888 if (error) 889 goto err_free_mousedev; 890 } 891 892 cdev_init(&mousedev->cdev, &mousedev_fops); 893 mousedev->cdev.kobj.parent = &mousedev->dev.kobj; 894 error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1); 895 if (error) 896 goto err_unregister_handle; 897 898 error = device_add(&mousedev->dev); 899 if (error) 900 goto err_cleanup_mousedev; 901 902 return mousedev; 903 904 err_cleanup_mousedev: 905 mousedev_cleanup(mousedev); 906 err_unregister_handle: 907 if (!mixdev) 908 input_unregister_handle(&mousedev->handle); 909 err_free_mousedev: 910 put_device(&mousedev->dev); 911 err_free_minor: 912 input_free_minor(minor); 913 err_out: 914 return ERR_PTR(error); 915} 916 917static void mousedev_destroy(struct mousedev *mousedev) 918{ 919 device_del(&mousedev->dev); 920 mousedev_cleanup(mousedev); 921 input_free_minor(MINOR(mousedev->dev.devt)); 922 if (!mousedev->is_mixdev) 923 input_unregister_handle(&mousedev->handle); 924 put_device(&mousedev->dev); 925} 926 927static int mixdev_add_device(struct mousedev *mousedev) 928{ 929 int retval; 930 931 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 932 if (retval) 933 return retval; 934 935 if (mousedev_mix->open) { 936 retval = mousedev_open_device(mousedev); 937 if (retval) 938 goto out; 939 940 mousedev->opened_by_mixdev = true; 941 } 942 943 get_device(&mousedev->dev); 944 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 945 946 out: 947 mutex_unlock(&mousedev_mix->mutex); 948 return retval; 949} 950 951static void mixdev_remove_device(struct mousedev *mousedev) 952{ 953 mutex_lock(&mousedev_mix->mutex); 954 955 if (mousedev->opened_by_mixdev) { 956 mousedev->opened_by_mixdev = false; 957 mousedev_close_device(mousedev); 958 } 959 960 list_del_init(&mousedev->mixdev_node); 961 mutex_unlock(&mousedev_mix->mutex); 962 963 put_device(&mousedev->dev); 964} 965 966static int mousedev_connect(struct input_handler *handler, 967 struct input_dev *dev, 968 const struct input_device_id *id) 969{ 970 struct mousedev *mousedev; 971 int error; 972 973 mousedev = mousedev_create(dev, handler, false); 974 if (IS_ERR(mousedev)) 975 return PTR_ERR(mousedev); 976 977 error = mixdev_add_device(mousedev); 978 if (error) { 979 mousedev_destroy(mousedev); 980 return error; 981 } 982 983 return 0; 984} 985 986static void mousedev_disconnect(struct input_handle *handle) 987{ 988 struct mousedev *mousedev = handle->private; 989 990 mixdev_remove_device(mousedev); 991 mousedev_destroy(mousedev); 992} 993 994static const struct input_device_id mousedev_ids[] = { 995 { 996 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 997 INPUT_DEVICE_ID_MATCH_KEYBIT | 998 INPUT_DEVICE_ID_MATCH_RELBIT, 999 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1000 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1001 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1002 }, /* A mouse like device, at least one button, 1003 two relative axes */ 1004 { 1005 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1006 INPUT_DEVICE_ID_MATCH_RELBIT, 1007 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1008 .relbit = { BIT_MASK(REL_WHEEL) }, 1009 }, /* A separate scrollwheel */ 1010 { 1011 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1012 INPUT_DEVICE_ID_MATCH_KEYBIT | 1013 INPUT_DEVICE_ID_MATCH_ABSBIT, 1014 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1015 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1016 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1017 }, /* A tablet like device, at least touch detection, 1018 two absolute axes */ 1019 { 1020 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1021 INPUT_DEVICE_ID_MATCH_KEYBIT | 1022 INPUT_DEVICE_ID_MATCH_ABSBIT, 1023 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1024 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1025 BIT_MASK(BTN_TOOL_FINGER) }, 1026 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1027 BIT_MASK(ABS_PRESSURE) | 1028 BIT_MASK(ABS_TOOL_WIDTH) }, 1029 }, /* A touchpad */ 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_LEFT)] = BIT_MASK(BTN_LEFT) }, 1036 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1037 }, /* Mouse-like device with absolute X and Y but ordinary 1038 clicks, like hp ILO2 High Performance mouse */ 1039 1040 { }, /* Terminating entry */ 1041}; 1042 1043MODULE_DEVICE_TABLE(input, mousedev_ids); 1044 1045static struct input_handler mousedev_handler = { 1046 .event = mousedev_event, 1047 .connect = mousedev_connect, 1048 .disconnect = mousedev_disconnect, 1049 .legacy_minors = true, 1050 .minor = MOUSEDEV_MINOR_BASE, 1051 .name = "mousedev", 1052 .id_table = mousedev_ids, 1053}; 1054 1055#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1056#include <linux/miscdevice.h> 1057 1058static struct miscdevice psaux_mouse = { 1059 .minor = PSMOUSE_MINOR, 1060 .name = "psaux", 1061 .fops = &mousedev_fops, 1062}; 1063 1064static bool psaux_registered; 1065 1066static void __init mousedev_psaux_register(void) 1067{ 1068 int error; 1069 1070 error = misc_register(&psaux_mouse); 1071 if (error) 1072 pr_warn("could not register psaux device, error: %d\n", 1073 error); 1074 else 1075 psaux_registered = true; 1076} 1077 1078static void __exit mousedev_psaux_unregister(void) 1079{ 1080 if (psaux_registered) 1081 misc_deregister(&psaux_mouse); 1082} 1083#else 1084static inline void mousedev_psaux_register(void) { } 1085static inline void mousedev_psaux_unregister(void) { } 1086#endif 1087 1088static int __init mousedev_init(void) 1089{ 1090 int error; 1091 1092 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true); 1093 if (IS_ERR(mousedev_mix)) 1094 return PTR_ERR(mousedev_mix); 1095 1096 error = input_register_handler(&mousedev_handler); 1097 if (error) { 1098 mousedev_destroy(mousedev_mix); 1099 return error; 1100 } 1101 1102 mousedev_psaux_register(); 1103 1104 pr_info("PS/2 mouse device common for all mice\n"); 1105 1106 return 0; 1107} 1108 1109static void __exit mousedev_exit(void) 1110{ 1111 mousedev_psaux_unregister(); 1112 input_unregister_handler(&mousedev_handler); 1113 mousedev_destroy(mousedev_mix); 1114} 1115 1116module_init(mousedev_init); 1117module_exit(mousedev_exit); 1118