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