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 MOUSEDEV_MINOR_BASE 32 13#define MOUSEDEV_MINORS 32 14#define MOUSEDEV_MIX 31 15 16#include <linux/sched.h> 17#include <linux/slab.h> 18#include <linux/poll.h> 19#include <linux/module.h> 20#include <linux/init.h> 21#include <linux/input.h> 22#include <linux/random.h> 23#include <linux/major.h> 24#include <linux/device.h> 25#include <linux/kernel.h> 26#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 27#include <linux/miscdevice.h> 28#endif 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 int minor; 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 bool exist; 70 71 struct list_head mixdev_node; 72 int mixdev_open; 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 81enum mousedev_emul { 82 MOUSEDEV_EMUL_PS2, 83 MOUSEDEV_EMUL_IMPS, 84 MOUSEDEV_EMUL_EXPS 85}; 86 87struct mousedev_motion { 88 int dx, dy, dz; 89 unsigned long buttons; 90}; 91 92#define PACKET_QUEUE_LEN 16 93struct mousedev_client { 94 struct fasync_struct *fasync; 95 struct mousedev *mousedev; 96 struct list_head node; 97 98 struct mousedev_motion packets[PACKET_QUEUE_LEN]; 99 unsigned int head, tail; 100 spinlock_t packet_lock; 101 int pos_x, pos_y; 102 103 signed char ps2[6]; 104 unsigned char ready, buffer, bufsiz; 105 unsigned char imexseq, impsseq; 106 enum mousedev_emul mode; 107 unsigned long last_buttons; 108}; 109 110#define MOUSEDEV_SEQ_LEN 6 111 112static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 113static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 114 115static struct input_handler mousedev_handler; 116 117static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; 118static DEFINE_MUTEX(mousedev_table_mutex); 119static struct mousedev *mousedev_mix; 120static LIST_HEAD(mousedev_mix_list); 121 122static void mixdev_open_devices(void); 123static void mixdev_close_devices(void); 124 125#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) 126#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) 127 128static void mousedev_touchpad_event(struct input_dev *dev, 129 struct mousedev *mousedev, 130 unsigned int code, int value) 131{ 132 int size, tmp; 133 enum { FRACTION_DENOM = 128 }; 134 135 switch (code) { 136 137 case ABS_X: 138 139 fx(0) = value; 140 if (mousedev->touch && mousedev->pkt_count >= 2) { 141 size = input_abs_get_max(dev, ABS_X) - 142 input_abs_get_min(dev, ABS_X); 143 if (size == 0) 144 size = 256 * 2; 145 146 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; 147 tmp += mousedev->frac_dx; 148 mousedev->packet.dx = tmp / FRACTION_DENOM; 149 mousedev->frac_dx = 150 tmp - mousedev->packet.dx * FRACTION_DENOM; 151 } 152 break; 153 154 case ABS_Y: 155 fy(0) = value; 156 if (mousedev->touch && mousedev->pkt_count >= 2) { 157 /* use X size for ABS_Y to keep the same scale */ 158 size = input_abs_get_max(dev, ABS_X) - 159 input_abs_get_min(dev, ABS_X); 160 if (size == 0) 161 size = 256 * 2; 162 163 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; 164 tmp += mousedev->frac_dy; 165 mousedev->packet.dy = tmp / FRACTION_DENOM; 166 mousedev->frac_dy = tmp - 167 mousedev->packet.dy * FRACTION_DENOM; 168 } 169 break; 170 } 171} 172 173static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, 174 unsigned int code, int value) 175{ 176 int min, max, size; 177 178 switch (code) { 179 180 case ABS_X: 181 min = input_abs_get_min(dev, ABS_X); 182 max = input_abs_get_max(dev, ABS_X); 183 184 size = max - min; 185 if (size == 0) 186 size = xres ? : 1; 187 188 clamp(value, min, max); 189 190 mousedev->packet.x = ((value - min) * xres) / size; 191 mousedev->packet.abs_event = 1; 192 break; 193 194 case ABS_Y: 195 min = input_abs_get_min(dev, ABS_Y); 196 max = input_abs_get_max(dev, ABS_Y); 197 198 size = max - min; 199 if (size == 0) 200 size = yres ? : 1; 201 202 clamp(value, min, max); 203 204 mousedev->packet.y = yres - ((value - min) * yres) / size; 205 mousedev->packet.abs_event = 1; 206 break; 207 } 208} 209 210static void mousedev_rel_event(struct mousedev *mousedev, 211 unsigned int code, int value) 212{ 213 switch (code) { 214 case REL_X: 215 mousedev->packet.dx += value; 216 break; 217 218 case REL_Y: 219 mousedev->packet.dy -= value; 220 break; 221 222 case REL_WHEEL: 223 mousedev->packet.dz -= value; 224 break; 225 } 226} 227 228static void mousedev_key_event(struct mousedev *mousedev, 229 unsigned int code, int value) 230{ 231 int index; 232 233 switch (code) { 234 235 case BTN_TOUCH: 236 case BTN_0: 237 case BTN_LEFT: index = 0; break; 238 239 case BTN_STYLUS: 240 case BTN_1: 241 case BTN_RIGHT: index = 1; break; 242 243 case BTN_2: 244 case BTN_FORWARD: 245 case BTN_STYLUS2: 246 case BTN_MIDDLE: index = 2; break; 247 248 case BTN_3: 249 case BTN_BACK: 250 case BTN_SIDE: index = 3; break; 251 252 case BTN_4: 253 case BTN_EXTRA: index = 4; break; 254 255 default: return; 256 } 257 258 if (value) { 259 set_bit(index, &mousedev->packet.buttons); 260 set_bit(index, &mousedev_mix->packet.buttons); 261 } else { 262 clear_bit(index, &mousedev->packet.buttons); 263 clear_bit(index, &mousedev_mix->packet.buttons); 264 } 265} 266 267static void mousedev_notify_readers(struct mousedev *mousedev, 268 struct mousedev_hw_data *packet) 269{ 270 struct mousedev_client *client; 271 struct mousedev_motion *p; 272 unsigned int new_head; 273 int wake_readers = 0; 274 275 rcu_read_lock(); 276 list_for_each_entry_rcu(client, &mousedev->client_list, node) { 277 278 /* Just acquire the lock, interrupts already disabled */ 279 spin_lock(&client->packet_lock); 280 281 p = &client->packets[client->head]; 282 if (client->ready && p->buttons != mousedev->packet.buttons) { 283 new_head = (client->head + 1) % PACKET_QUEUE_LEN; 284 if (new_head != client->tail) { 285 p = &client->packets[client->head = new_head]; 286 memset(p, 0, sizeof(struct mousedev_motion)); 287 } 288 } 289 290 if (packet->abs_event) { 291 p->dx += packet->x - client->pos_x; 292 p->dy += packet->y - client->pos_y; 293 client->pos_x = packet->x; 294 client->pos_y = packet->y; 295 } 296 297 client->pos_x += packet->dx; 298 client->pos_x = client->pos_x < 0 ? 299 0 : (client->pos_x >= xres ? xres : client->pos_x); 300 client->pos_y += packet->dy; 301 client->pos_y = client->pos_y < 0 ? 302 0 : (client->pos_y >= yres ? yres : client->pos_y); 303 304 p->dx += packet->dx; 305 p->dy += packet->dy; 306 p->dz += packet->dz; 307 p->buttons = mousedev->packet.buttons; 308 309 if (p->dx || p->dy || p->dz || 310 p->buttons != client->last_buttons) 311 client->ready = 1; 312 313 spin_unlock(&client->packet_lock); 314 315 if (client->ready) { 316 kill_fasync(&client->fasync, SIGIO, POLL_IN); 317 wake_readers = 1; 318 } 319 } 320 rcu_read_unlock(); 321 322 if (wake_readers) 323 wake_up_interruptible(&mousedev->wait); 324} 325 326static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) 327{ 328 if (!value) { 329 if (mousedev->touch && 330 time_before(jiffies, 331 mousedev->touch + msecs_to_jiffies(tap_time))) { 332 /* 333 * Toggle left button to emulate tap. 334 * We rely on the fact that mousedev_mix always has 0 335 * motion packet so we won't mess current position. 336 */ 337 set_bit(0, &mousedev->packet.buttons); 338 set_bit(0, &mousedev_mix->packet.buttons); 339 mousedev_notify_readers(mousedev, &mousedev_mix->packet); 340 mousedev_notify_readers(mousedev_mix, 341 &mousedev_mix->packet); 342 clear_bit(0, &mousedev->packet.buttons); 343 clear_bit(0, &mousedev_mix->packet.buttons); 344 } 345 mousedev->touch = mousedev->pkt_count = 0; 346 mousedev->frac_dx = 0; 347 mousedev->frac_dy = 0; 348 349 } else if (!mousedev->touch) 350 mousedev->touch = jiffies; 351} 352 353static void mousedev_event(struct input_handle *handle, 354 unsigned int type, unsigned int code, int value) 355{ 356 struct mousedev *mousedev = handle->private; 357 358 switch (type) { 359 360 case EV_ABS: 361 /* Ignore joysticks */ 362 if (test_bit(BTN_TRIGGER, handle->dev->keybit)) 363 return; 364 365 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 366 mousedev_touchpad_event(handle->dev, 367 mousedev, code, value); 368 else 369 mousedev_abs_event(handle->dev, mousedev, code, value); 370 371 break; 372 373 case EV_REL: 374 mousedev_rel_event(mousedev, code, value); 375 break; 376 377 case EV_KEY: 378 if (value != 2) { 379 if (code == BTN_TOUCH && 380 test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 381 mousedev_touchpad_touch(mousedev, value); 382 else 383 mousedev_key_event(mousedev, code, value); 384 } 385 break; 386 387 case EV_SYN: 388 if (code == SYN_REPORT) { 389 if (mousedev->touch) { 390 mousedev->pkt_count++; 391 /* 392 * Input system eats duplicate events, 393 * but we need all of them to do correct 394 * averaging so apply present one forward 395 */ 396 fx(0) = fx(1); 397 fy(0) = fy(1); 398 } 399 400 mousedev_notify_readers(mousedev, &mousedev->packet); 401 mousedev_notify_readers(mousedev_mix, &mousedev->packet); 402 403 mousedev->packet.dx = mousedev->packet.dy = 404 mousedev->packet.dz = 0; 405 mousedev->packet.abs_event = 0; 406 } 407 break; 408 } 409} 410 411static int mousedev_fasync(int fd, struct file *file, int on) 412{ 413 struct mousedev_client *client = file->private_data; 414 415 return fasync_helper(fd, file, on, &client->fasync); 416} 417 418static void mousedev_free(struct device *dev) 419{ 420 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 421 422 input_put_device(mousedev->handle.dev); 423 kfree(mousedev); 424} 425 426static int mousedev_open_device(struct mousedev *mousedev) 427{ 428 int retval; 429 430 retval = mutex_lock_interruptible(&mousedev->mutex); 431 if (retval) 432 return retval; 433 434 if (mousedev->minor == MOUSEDEV_MIX) 435 mixdev_open_devices(); 436 else if (!mousedev->exist) 437 retval = -ENODEV; 438 else if (!mousedev->open++) { 439 retval = input_open_device(&mousedev->handle); 440 if (retval) 441 mousedev->open--; 442 } 443 444 mutex_unlock(&mousedev->mutex); 445 return retval; 446} 447 448static void mousedev_close_device(struct mousedev *mousedev) 449{ 450 mutex_lock(&mousedev->mutex); 451 452 if (mousedev->minor == MOUSEDEV_MIX) 453 mixdev_close_devices(); 454 else if (mousedev->exist && !--mousedev->open) 455 input_close_device(&mousedev->handle); 456 457 mutex_unlock(&mousedev->mutex); 458} 459 460/* 461 * Open all available devices so they can all be multiplexed in one. 462 * stream. Note that this function is called with mousedev_mix->mutex 463 * held. 464 */ 465static void mixdev_open_devices(void) 466{ 467 struct mousedev *mousedev; 468 469 if (mousedev_mix->open++) 470 return; 471 472 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 473 if (!mousedev->mixdev_open) { 474 if (mousedev_open_device(mousedev)) 475 continue; 476 477 mousedev->mixdev_open = 1; 478 } 479 } 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(void) 488{ 489 struct mousedev *mousedev; 490 491 if (--mousedev_mix->open) 492 return; 493 494 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 495 if (mousedev->mixdev_open) { 496 mousedev->mixdev_open = 0; 497 mousedev_close_device(mousedev); 498 } 499 } 500} 501 502 503static void mousedev_attach_client(struct mousedev *mousedev, 504 struct mousedev_client *client) 505{ 506 spin_lock(&mousedev->client_lock); 507 list_add_tail_rcu(&client->node, &mousedev->client_list); 508 spin_unlock(&mousedev->client_lock); 509 synchronize_rcu(); 510} 511 512static void mousedev_detach_client(struct mousedev *mousedev, 513 struct mousedev_client *client) 514{ 515 spin_lock(&mousedev->client_lock); 516 list_del_rcu(&client->node); 517 spin_unlock(&mousedev->client_lock); 518 synchronize_rcu(); 519} 520 521static int mousedev_release(struct inode *inode, struct file *file) 522{ 523 struct mousedev_client *client = file->private_data; 524 struct mousedev *mousedev = client->mousedev; 525 526 mousedev_detach_client(mousedev, client); 527 kfree(client); 528 529 mousedev_close_device(mousedev); 530 put_device(&mousedev->dev); 531 532 return 0; 533} 534 535static int mousedev_open(struct inode *inode, struct file *file) 536{ 537 struct mousedev_client *client; 538 struct mousedev *mousedev; 539 int error; 540 int i; 541 542#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 543 if (imajor(inode) == MISC_MAJOR) 544 i = MOUSEDEV_MIX; 545 else 546#endif 547 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 548 549 if (i >= MOUSEDEV_MINORS) 550 return -ENODEV; 551 552 error = mutex_lock_interruptible(&mousedev_table_mutex); 553 if (error) { 554 return error; 555 } 556 mousedev = mousedev_table[i]; 557 if (mousedev) 558 get_device(&mousedev->dev); 559 mutex_unlock(&mousedev_table_mutex); 560 561 if (!mousedev) { 562 return -ENODEV; 563 } 564 565 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 566 if (!client) { 567 error = -ENOMEM; 568 goto err_put_mousedev; 569 } 570 571 spin_lock_init(&client->packet_lock); 572 client->pos_x = xres / 2; 573 client->pos_y = yres / 2; 574 client->mousedev = mousedev; 575 mousedev_attach_client(mousedev, client); 576 577 error = mousedev_open_device(mousedev); 578 if (error) 579 goto err_free_client; 580 581 file->private_data = client; 582 return 0; 583 584 err_free_client: 585 mousedev_detach_client(mousedev, client); 586 kfree(client); 587 err_put_mousedev: 588 put_device(&mousedev->dev); 589 return error; 590} 591 592static inline int mousedev_limit_delta(int delta, int limit) 593{ 594 return delta > limit ? limit : (delta < -limit ? -limit : delta); 595} 596 597static void mousedev_packet(struct mousedev_client *client, 598 signed char *ps2_data) 599{ 600 struct mousedev_motion *p = &client->packets[client->tail]; 601 602 ps2_data[0] = 0x08 | 603 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 604 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 605 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 606 p->dx -= ps2_data[1]; 607 p->dy -= ps2_data[2]; 608 609 switch (client->mode) { 610 case MOUSEDEV_EMUL_EXPS: 611 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 612 p->dz -= ps2_data[3]; 613 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 614 client->bufsiz = 4; 615 break; 616 617 case MOUSEDEV_EMUL_IMPS: 618 ps2_data[0] |= 619 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 620 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 621 p->dz -= ps2_data[3]; 622 client->bufsiz = 4; 623 break; 624 625 case MOUSEDEV_EMUL_PS2: 626 default: 627 ps2_data[0] |= 628 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 629 p->dz = 0; 630 client->bufsiz = 3; 631 break; 632 } 633 634 if (!p->dx && !p->dy && !p->dz) { 635 if (client->tail == client->head) { 636 client->ready = 0; 637 client->last_buttons = p->buttons; 638 } else 639 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 640 } 641} 642 643static void mousedev_generate_response(struct mousedev_client *client, 644 int command) 645{ 646 client->ps2[0] = 0xfa; /* ACK */ 647 648 switch (command) { 649 650 case 0xeb: /* Poll */ 651 mousedev_packet(client, &client->ps2[1]); 652 client->bufsiz++; /* account for leading ACK */ 653 break; 654 655 case 0xf2: /* Get ID */ 656 switch (client->mode) { 657 case MOUSEDEV_EMUL_PS2: 658 client->ps2[1] = 0; 659 break; 660 case MOUSEDEV_EMUL_IMPS: 661 client->ps2[1] = 3; 662 break; 663 case MOUSEDEV_EMUL_EXPS: 664 client->ps2[1] = 4; 665 break; 666 } 667 client->bufsiz = 2; 668 break; 669 670 case 0xe9: /* Get info */ 671 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 672 client->bufsiz = 4; 673 break; 674 675 case 0xff: /* Reset */ 676 client->impsseq = client->imexseq = 0; 677 client->mode = MOUSEDEV_EMUL_PS2; 678 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 679 client->bufsiz = 3; 680 break; 681 682 default: 683 client->bufsiz = 1; 684 break; 685 } 686 client->buffer = client->bufsiz; 687} 688 689static ssize_t mousedev_write(struct file *file, const char __user *buffer, 690 size_t count, loff_t *ppos) 691{ 692 struct mousedev_client *client = file->private_data; 693 unsigned char c; 694 unsigned int i; 695 696 for (i = 0; i < count; i++) { 697 698 if (get_user(c, buffer + i)) 699 return -EFAULT; 700 701 spin_lock_irq(&client->packet_lock); 702 703 if (c == mousedev_imex_seq[client->imexseq]) { 704 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 705 client->imexseq = 0; 706 client->mode = MOUSEDEV_EMUL_EXPS; 707 } 708 } else 709 client->imexseq = 0; 710 711 if (c == mousedev_imps_seq[client->impsseq]) { 712 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 713 client->impsseq = 0; 714 client->mode = MOUSEDEV_EMUL_IMPS; 715 } 716 } else 717 client->impsseq = 0; 718 719 mousedev_generate_response(client, c); 720 721 spin_unlock_irq(&client->packet_lock); 722 } 723 724 kill_fasync(&client->fasync, SIGIO, POLL_IN); 725 wake_up_interruptible(&client->mousedev->wait); 726 727 return count; 728} 729 730static ssize_t mousedev_read(struct file *file, char __user *buffer, 731 size_t count, loff_t *ppos) 732{ 733 struct mousedev_client *client = file->private_data; 734 struct mousedev *mousedev = client->mousedev; 735 signed char data[sizeof(client->ps2)]; 736 int retval = 0; 737 738 if (!client->ready && !client->buffer && mousedev->exist && 739 (file->f_flags & O_NONBLOCK)) 740 return -EAGAIN; 741 742 retval = wait_event_interruptible(mousedev->wait, 743 !mousedev->exist || client->ready || client->buffer); 744 if (retval) 745 return retval; 746 747 if (!mousedev->exist) 748 return -ENODEV; 749 750 spin_lock_irq(&client->packet_lock); 751 752 if (!client->buffer && client->ready) { 753 mousedev_packet(client, client->ps2); 754 client->buffer = client->bufsiz; 755 } 756 757 if (count > client->buffer) 758 count = client->buffer; 759 760 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 761 client->buffer -= count; 762 763 spin_unlock_irq(&client->packet_lock); 764 765 if (copy_to_user(buffer, data, count)) 766 return -EFAULT; 767 768 return count; 769} 770 771/* No kernel lock - fine */ 772static unsigned int mousedev_poll(struct file *file, poll_table *wait) 773{ 774 struct mousedev_client *client = file->private_data; 775 struct mousedev *mousedev = client->mousedev; 776 unsigned int mask; 777 778 poll_wait(file, &mousedev->wait, wait); 779 780 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 781 if (client->ready || client->buffer) 782 mask |= POLLIN | POLLRDNORM; 783 784 return mask; 785} 786 787static const struct file_operations mousedev_fops = { 788 .owner = THIS_MODULE, 789 .read = mousedev_read, 790 .write = mousedev_write, 791 .poll = mousedev_poll, 792 .open = mousedev_open, 793 .release = mousedev_release, 794 .fasync = mousedev_fasync, 795}; 796 797static int mousedev_install_chrdev(struct mousedev *mousedev) 798{ 799 mousedev_table[mousedev->minor] = mousedev; 800 return 0; 801} 802 803static void mousedev_remove_chrdev(struct mousedev *mousedev) 804{ 805 mutex_lock(&mousedev_table_mutex); 806 mousedev_table[mousedev->minor] = NULL; 807 mutex_unlock(&mousedev_table_mutex); 808} 809 810/* 811 * Mark device non-existent. This disables writes, ioctls and 812 * prevents new users from opening the device. Already posted 813 * blocking reads will stay, however new ones will fail. 814 */ 815static void mousedev_mark_dead(struct mousedev *mousedev) 816{ 817 mutex_lock(&mousedev->mutex); 818 mousedev->exist = false; 819 mutex_unlock(&mousedev->mutex); 820} 821 822/* 823 * Wake up users waiting for IO so they can disconnect from 824 * dead device. 825 */ 826static void mousedev_hangup(struct mousedev *mousedev) 827{ 828 struct mousedev_client *client; 829 830 spin_lock(&mousedev->client_lock); 831 list_for_each_entry(client, &mousedev->client_list, node) 832 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 833 spin_unlock(&mousedev->client_lock); 834 835 wake_up_interruptible(&mousedev->wait); 836} 837 838static void mousedev_cleanup(struct mousedev *mousedev) 839{ 840 struct input_handle *handle = &mousedev->handle; 841 842 mousedev_mark_dead(mousedev); 843 mousedev_hangup(mousedev); 844 mousedev_remove_chrdev(mousedev); 845 846 /* mousedev is marked dead so no one else accesses mousedev->open */ 847 if (mousedev->open) 848 input_close_device(handle); 849} 850 851static struct mousedev *mousedev_create(struct input_dev *dev, 852 struct input_handler *handler, 853 int minor) 854{ 855 struct mousedev *mousedev; 856 int error; 857 858 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 859 if (!mousedev) { 860 error = -ENOMEM; 861 goto err_out; 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 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 870 init_waitqueue_head(&mousedev->wait); 871 872 if (minor == MOUSEDEV_MIX) 873 dev_set_name(&mousedev->dev, "mice"); 874 else 875 dev_set_name(&mousedev->dev, "mouse%d", minor); 876 877 mousedev->minor = minor; 878 mousedev->exist = true; 879 mousedev->handle.dev = input_get_device(dev); 880 mousedev->handle.name = dev_name(&mousedev->dev); 881 mousedev->handle.handler = handler; 882 mousedev->handle.private = mousedev; 883 884 mousedev->dev.class = &input_class; 885 if (dev) 886 mousedev->dev.parent = &dev->dev; 887 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 888 mousedev->dev.release = mousedev_free; 889 device_initialize(&mousedev->dev); 890 891 if (minor != MOUSEDEV_MIX) { 892 error = input_register_handle(&mousedev->handle); 893 if (error) 894 goto err_free_mousedev; 895 } 896 897 error = mousedev_install_chrdev(mousedev); 898 if (error) 899 goto err_unregister_handle; 900 901 error = device_add(&mousedev->dev); 902 if (error) 903 goto err_cleanup_mousedev; 904 905 return mousedev; 906 907 err_cleanup_mousedev: 908 mousedev_cleanup(mousedev); 909 err_unregister_handle: 910 if (minor != MOUSEDEV_MIX) 911 input_unregister_handle(&mousedev->handle); 912 err_free_mousedev: 913 put_device(&mousedev->dev); 914 err_out: 915 return ERR_PTR(error); 916} 917 918static void mousedev_destroy(struct mousedev *mousedev) 919{ 920 device_del(&mousedev->dev); 921 mousedev_cleanup(mousedev); 922 if (mousedev->minor != MOUSEDEV_MIX) 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->mixdev_open = 1; 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->mixdev_open) { 956 mousedev->mixdev_open = 0; 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 minor; 972 int error; 973 974 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 975 if (!mousedev_table[minor]) 976 break; 977 978 if (minor == MOUSEDEV_MINORS) { 979 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 980 return -ENFILE; 981 } 982 983 mousedev = mousedev_create(dev, handler, minor); 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 996static 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 1004static 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 1053MODULE_DEVICE_TABLE(input, mousedev_ids); 1054 1055static struct input_handler mousedev_handler = { 1056 .event = mousedev_event, 1057 .connect = mousedev_connect, 1058 .disconnect = mousedev_disconnect, 1059 .fops = &mousedev_fops, 1060 .minor = MOUSEDEV_MINOR_BASE, 1061 .name = "mousedev", 1062 .id_table = mousedev_ids, 1063}; 1064 1065#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1066static struct miscdevice psaux_mouse = { 1067 PSMOUSE_MINOR, "psaux", &mousedev_fops 1068}; 1069static int psaux_registered; 1070#endif 1071 1072static int __init mousedev_init(void) 1073{ 1074 int error; 1075 1076 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1077 if (IS_ERR(mousedev_mix)) 1078 return PTR_ERR(mousedev_mix); 1079 1080 error = input_register_handler(&mousedev_handler); 1081 if (error) { 1082 mousedev_destroy(mousedev_mix); 1083 return error; 1084 } 1085 1086#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1087 error = misc_register(&psaux_mouse); 1088 if (error) 1089 printk(KERN_WARNING "mice: could not register psaux device, " 1090 "error: %d\n", error); 1091 else 1092 psaux_registered = 1; 1093#endif 1094 1095 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1096 1097 return 0; 1098} 1099 1100static void __exit mousedev_exit(void) 1101{ 1102#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1103 if (psaux_registered) 1104 misc_deregister(&psaux_mouse); 1105#endif 1106 input_unregister_handler(&mousedev_handler); 1107 mousedev_destroy(mousedev_mix); 1108} 1109 1110module_init(mousedev_init); 1111module_exit(mousedev_exit); 1112