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/slab.h> 17 #include <linux/poll.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/input.h> 21 #include <linux/random.h> 22 #include <linux/major.h> 23 #include <linux/device.h> 24 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 25 #include <linux/miscdevice.h> 26 #endif 27 28 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 29 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 30 MODULE_LICENSE("GPL"); 31 32 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X 33 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 34 #endif 35 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y 36 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 37 #endif 38 39 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 40 module_param(xres, uint, 0644); 41 MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 42 43 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 44 module_param(yres, uint, 0644); 45 MODULE_PARM_DESC(yres, "Vertical screen resolution"); 46 47 static unsigned tap_time = 200; 48 module_param(tap_time, uint, 0644); 49 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 50 51 struct mousedev_hw_data { 52 int dx, dy, dz; 53 int x, y; 54 int abs_event; 55 unsigned long buttons; 56 }; 57 58 struct mousedev { 59 int exist; 60 int open; 61 int minor; 62 char name[16]; 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 int retval; 406 struct mousedev_client *client = file->private_data; 407 408 retval = fasync_helper(fd, file, on, &client->fasync); 409 410 return retval < 0 ? retval : 0; 411 } 412 413 static void mousedev_free(struct device *dev) 414 { 415 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 416 417 input_put_device(mousedev->handle.dev); 418 kfree(mousedev); 419 } 420 421 static int mousedev_open_device(struct mousedev *mousedev) 422 { 423 int retval; 424 425 retval = mutex_lock_interruptible(&mousedev->mutex); 426 if (retval) 427 return retval; 428 429 if (mousedev->minor == MOUSEDEV_MIX) 430 mixdev_open_devices(); 431 else if (!mousedev->exist) 432 retval = -ENODEV; 433 else if (!mousedev->open++) { 434 retval = input_open_device(&mousedev->handle); 435 if (retval) 436 mousedev->open--; 437 } 438 439 mutex_unlock(&mousedev->mutex); 440 return retval; 441 } 442 443 static void mousedev_close_device(struct mousedev *mousedev) 444 { 445 mutex_lock(&mousedev->mutex); 446 447 if (mousedev->minor == MOUSEDEV_MIX) 448 mixdev_close_devices(); 449 else if (mousedev->exist && !--mousedev->open) 450 input_close_device(&mousedev->handle); 451 452 mutex_unlock(&mousedev->mutex); 453 } 454 455 /* 456 * Open all available devices so they can all be multiplexed in one. 457 * stream. Note that this function is called with mousedev_mix->mutex 458 * held. 459 */ 460 static void mixdev_open_devices(void) 461 { 462 struct mousedev *mousedev; 463 464 if (mousedev_mix->open++) 465 return; 466 467 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 468 if (!mousedev->mixdev_open) { 469 if (mousedev_open_device(mousedev)) 470 continue; 471 472 mousedev->mixdev_open = 1; 473 } 474 } 475 } 476 477 /* 478 * Close all devices that were opened as part of multiplexed 479 * device. Note that this function is called with mousedev_mix->mutex 480 * held. 481 */ 482 static void mixdev_close_devices(void) 483 { 484 struct mousedev *mousedev; 485 486 if (--mousedev_mix->open) 487 return; 488 489 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 490 if (mousedev->mixdev_open) { 491 mousedev->mixdev_open = 0; 492 mousedev_close_device(mousedev); 493 } 494 } 495 } 496 497 498 static void mousedev_attach_client(struct mousedev *mousedev, 499 struct mousedev_client *client) 500 { 501 spin_lock(&mousedev->client_lock); 502 list_add_tail_rcu(&client->node, &mousedev->client_list); 503 spin_unlock(&mousedev->client_lock); 504 synchronize_rcu(); 505 } 506 507 static void mousedev_detach_client(struct mousedev *mousedev, 508 struct mousedev_client *client) 509 { 510 spin_lock(&mousedev->client_lock); 511 list_del_rcu(&client->node); 512 spin_unlock(&mousedev->client_lock); 513 synchronize_rcu(); 514 } 515 516 static int mousedev_release(struct inode *inode, struct file *file) 517 { 518 struct mousedev_client *client = file->private_data; 519 struct mousedev *mousedev = client->mousedev; 520 521 mousedev_fasync(-1, file, 0); 522 mousedev_detach_client(mousedev, client); 523 kfree(client); 524 525 mousedev_close_device(mousedev); 526 put_device(&mousedev->dev); 527 528 return 0; 529 } 530 531 static int mousedev_open(struct inode *inode, struct file *file) 532 { 533 struct mousedev_client *client; 534 struct mousedev *mousedev; 535 int error; 536 int i; 537 538 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 539 if (imajor(inode) == MISC_MAJOR) 540 i = MOUSEDEV_MIX; 541 else 542 #endif 543 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 544 545 if (i >= MOUSEDEV_MINORS) 546 return -ENODEV; 547 548 error = mutex_lock_interruptible(&mousedev_table_mutex); 549 if (error) 550 return error; 551 mousedev = mousedev_table[i]; 552 if (mousedev) 553 get_device(&mousedev->dev); 554 mutex_unlock(&mousedev_table_mutex); 555 556 if (!mousedev) 557 return -ENODEV; 558 559 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 560 if (!client) { 561 error = -ENOMEM; 562 goto err_put_mousedev; 563 } 564 565 spin_lock_init(&client->packet_lock); 566 client->pos_x = xres / 2; 567 client->pos_y = yres / 2; 568 client->mousedev = mousedev; 569 mousedev_attach_client(mousedev, client); 570 571 error = mousedev_open_device(mousedev); 572 if (error) 573 goto err_free_client; 574 575 file->private_data = client; 576 return 0; 577 578 err_free_client: 579 mousedev_detach_client(mousedev, client); 580 kfree(client); 581 err_put_mousedev: 582 put_device(&mousedev->dev); 583 return error; 584 } 585 586 static inline int mousedev_limit_delta(int delta, int limit) 587 { 588 return delta > limit ? limit : (delta < -limit ? -limit : delta); 589 } 590 591 static void mousedev_packet(struct mousedev_client *client, 592 signed char *ps2_data) 593 { 594 struct mousedev_motion *p = &client->packets[client->tail]; 595 596 ps2_data[0] = 0x08 | 597 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 598 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 599 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 600 p->dx -= ps2_data[1]; 601 p->dy -= ps2_data[2]; 602 603 switch (client->mode) { 604 case MOUSEDEV_EMUL_EXPS: 605 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 606 p->dz -= ps2_data[3]; 607 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 608 client->bufsiz = 4; 609 break; 610 611 case MOUSEDEV_EMUL_IMPS: 612 ps2_data[0] |= 613 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 614 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 615 p->dz -= ps2_data[3]; 616 client->bufsiz = 4; 617 break; 618 619 case MOUSEDEV_EMUL_PS2: 620 default: 621 ps2_data[0] |= 622 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 623 p->dz = 0; 624 client->bufsiz = 3; 625 break; 626 } 627 628 if (!p->dx && !p->dy && !p->dz) { 629 if (client->tail == client->head) { 630 client->ready = 0; 631 client->last_buttons = p->buttons; 632 } else 633 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 634 } 635 } 636 637 static void mousedev_generate_response(struct mousedev_client *client, 638 int command) 639 { 640 client->ps2[0] = 0xfa; /* ACK */ 641 642 switch (command) { 643 644 case 0xeb: /* Poll */ 645 mousedev_packet(client, &client->ps2[1]); 646 client->bufsiz++; /* account for leading ACK */ 647 break; 648 649 case 0xf2: /* Get ID */ 650 switch (client->mode) { 651 case MOUSEDEV_EMUL_PS2: 652 client->ps2[1] = 0; 653 break; 654 case MOUSEDEV_EMUL_IMPS: 655 client->ps2[1] = 3; 656 break; 657 case MOUSEDEV_EMUL_EXPS: 658 client->ps2[1] = 4; 659 break; 660 } 661 client->bufsiz = 2; 662 break; 663 664 case 0xe9: /* Get info */ 665 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 666 client->bufsiz = 4; 667 break; 668 669 case 0xff: /* Reset */ 670 client->impsseq = client->imexseq = 0; 671 client->mode = MOUSEDEV_EMUL_PS2; 672 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 673 client->bufsiz = 3; 674 break; 675 676 default: 677 client->bufsiz = 1; 678 break; 679 } 680 client->buffer = client->bufsiz; 681 } 682 683 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 684 size_t count, loff_t *ppos) 685 { 686 struct mousedev_client *client = file->private_data; 687 unsigned char c; 688 unsigned int i; 689 690 for (i = 0; i < count; i++) { 691 692 if (get_user(c, buffer + i)) 693 return -EFAULT; 694 695 spin_lock_irq(&client->packet_lock); 696 697 if (c == mousedev_imex_seq[client->imexseq]) { 698 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 699 client->imexseq = 0; 700 client->mode = MOUSEDEV_EMUL_EXPS; 701 } 702 } else 703 client->imexseq = 0; 704 705 if (c == mousedev_imps_seq[client->impsseq]) { 706 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 707 client->impsseq = 0; 708 client->mode = MOUSEDEV_EMUL_IMPS; 709 } 710 } else 711 client->impsseq = 0; 712 713 mousedev_generate_response(client, c); 714 715 spin_unlock_irq(&client->packet_lock); 716 } 717 718 kill_fasync(&client->fasync, SIGIO, POLL_IN); 719 wake_up_interruptible(&client->mousedev->wait); 720 721 return count; 722 } 723 724 static ssize_t mousedev_read(struct file *file, char __user *buffer, 725 size_t count, loff_t *ppos) 726 { 727 struct mousedev_client *client = file->private_data; 728 struct mousedev *mousedev = client->mousedev; 729 signed char data[sizeof(client->ps2)]; 730 int retval = 0; 731 732 if (!client->ready && !client->buffer && mousedev->exist && 733 (file->f_flags & O_NONBLOCK)) 734 return -EAGAIN; 735 736 retval = wait_event_interruptible(mousedev->wait, 737 !mousedev->exist || client->ready || client->buffer); 738 if (retval) 739 return retval; 740 741 if (!mousedev->exist) 742 return -ENODEV; 743 744 spin_lock_irq(&client->packet_lock); 745 746 if (!client->buffer && client->ready) { 747 mousedev_packet(client, client->ps2); 748 client->buffer = client->bufsiz; 749 } 750 751 if (count > client->buffer) 752 count = client->buffer; 753 754 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 755 client->buffer -= count; 756 757 spin_unlock_irq(&client->packet_lock); 758 759 if (copy_to_user(buffer, data, count)) 760 return -EFAULT; 761 762 return count; 763 } 764 765 /* No kernel lock - fine */ 766 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 767 { 768 struct mousedev_client *client = file->private_data; 769 struct mousedev *mousedev = client->mousedev; 770 771 poll_wait(file, &mousedev->wait, wait); 772 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) | 773 (mousedev->exist ? 0 : (POLLHUP | POLLERR)); 774 } 775 776 static const struct file_operations mousedev_fops = { 777 .owner = THIS_MODULE, 778 .read = mousedev_read, 779 .write = mousedev_write, 780 .poll = mousedev_poll, 781 .open = mousedev_open, 782 .release = mousedev_release, 783 .fasync = mousedev_fasync, 784 }; 785 786 static int mousedev_install_chrdev(struct mousedev *mousedev) 787 { 788 mousedev_table[mousedev->minor] = mousedev; 789 return 0; 790 } 791 792 static void mousedev_remove_chrdev(struct mousedev *mousedev) 793 { 794 mutex_lock(&mousedev_table_mutex); 795 mousedev_table[mousedev->minor] = NULL; 796 mutex_unlock(&mousedev_table_mutex); 797 } 798 799 /* 800 * Mark device non-existent. This disables writes, ioctls and 801 * prevents new users from opening the device. Already posted 802 * blocking reads will stay, however new ones will fail. 803 */ 804 static void mousedev_mark_dead(struct mousedev *mousedev) 805 { 806 mutex_lock(&mousedev->mutex); 807 mousedev->exist = 0; 808 mutex_unlock(&mousedev->mutex); 809 } 810 811 /* 812 * Wake up users waiting for IO so they can disconnect from 813 * dead device. 814 */ 815 static void mousedev_hangup(struct mousedev *mousedev) 816 { 817 struct mousedev_client *client; 818 819 spin_lock(&mousedev->client_lock); 820 list_for_each_entry(client, &mousedev->client_list, node) 821 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 822 spin_unlock(&mousedev->client_lock); 823 824 wake_up_interruptible(&mousedev->wait); 825 } 826 827 static void mousedev_cleanup(struct mousedev *mousedev) 828 { 829 struct input_handle *handle = &mousedev->handle; 830 831 mousedev_mark_dead(mousedev); 832 mousedev_hangup(mousedev); 833 mousedev_remove_chrdev(mousedev); 834 835 /* mousedev is marked dead so no one else accesses mousedev->open */ 836 if (mousedev->open) 837 input_close_device(handle); 838 } 839 840 static struct mousedev *mousedev_create(struct input_dev *dev, 841 struct input_handler *handler, 842 int minor) 843 { 844 struct mousedev *mousedev; 845 int error; 846 847 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 848 if (!mousedev) { 849 error = -ENOMEM; 850 goto err_out; 851 } 852 853 INIT_LIST_HEAD(&mousedev->client_list); 854 INIT_LIST_HEAD(&mousedev->mixdev_node); 855 spin_lock_init(&mousedev->client_lock); 856 mutex_init(&mousedev->mutex); 857 lockdep_set_subclass(&mousedev->mutex, 858 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 859 init_waitqueue_head(&mousedev->wait); 860 861 if (minor == MOUSEDEV_MIX) 862 strlcpy(mousedev->name, "mice", sizeof(mousedev->name)); 863 else 864 snprintf(mousedev->name, sizeof(mousedev->name), 865 "mouse%d", minor); 866 867 mousedev->minor = minor; 868 mousedev->exist = 1; 869 mousedev->handle.dev = input_get_device(dev); 870 mousedev->handle.name = mousedev->name; 871 mousedev->handle.handler = handler; 872 mousedev->handle.private = mousedev; 873 874 strlcpy(mousedev->dev.bus_id, mousedev->name, 875 sizeof(mousedev->dev.bus_id)); 876 mousedev->dev.class = &input_class; 877 if (dev) 878 mousedev->dev.parent = &dev->dev; 879 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 880 mousedev->dev.release = mousedev_free; 881 device_initialize(&mousedev->dev); 882 883 if (minor != MOUSEDEV_MIX) { 884 error = input_register_handle(&mousedev->handle); 885 if (error) 886 goto err_free_mousedev; 887 } 888 889 error = mousedev_install_chrdev(mousedev); 890 if (error) 891 goto err_unregister_handle; 892 893 error = device_add(&mousedev->dev); 894 if (error) 895 goto err_cleanup_mousedev; 896 897 return mousedev; 898 899 err_cleanup_mousedev: 900 mousedev_cleanup(mousedev); 901 err_unregister_handle: 902 if (minor != MOUSEDEV_MIX) 903 input_unregister_handle(&mousedev->handle); 904 err_free_mousedev: 905 put_device(&mousedev->dev); 906 err_out: 907 return ERR_PTR(error); 908 } 909 910 static void mousedev_destroy(struct mousedev *mousedev) 911 { 912 device_del(&mousedev->dev); 913 mousedev_cleanup(mousedev); 914 if (mousedev->minor != MOUSEDEV_MIX) 915 input_unregister_handle(&mousedev->handle); 916 put_device(&mousedev->dev); 917 } 918 919 static int mixdev_add_device(struct mousedev *mousedev) 920 { 921 int retval; 922 923 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 924 if (retval) 925 return retval; 926 927 if (mousedev_mix->open) { 928 retval = mousedev_open_device(mousedev); 929 if (retval) 930 goto out; 931 932 mousedev->mixdev_open = 1; 933 } 934 935 get_device(&mousedev->dev); 936 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 937 938 out: 939 mutex_unlock(&mousedev_mix->mutex); 940 return retval; 941 } 942 943 static void mixdev_remove_device(struct mousedev *mousedev) 944 { 945 mutex_lock(&mousedev_mix->mutex); 946 947 if (mousedev->mixdev_open) { 948 mousedev->mixdev_open = 0; 949 mousedev_close_device(mousedev); 950 } 951 952 list_del_init(&mousedev->mixdev_node); 953 mutex_unlock(&mousedev_mix->mutex); 954 955 put_device(&mousedev->dev); 956 } 957 958 static int mousedev_connect(struct input_handler *handler, 959 struct input_dev *dev, 960 const struct input_device_id *id) 961 { 962 struct mousedev *mousedev; 963 int minor; 964 int error; 965 966 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 967 if (!mousedev_table[minor]) 968 break; 969 970 if (minor == MOUSEDEV_MINORS) { 971 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 972 return -ENFILE; 973 } 974 975 mousedev = mousedev_create(dev, handler, minor); 976 if (IS_ERR(mousedev)) 977 return PTR_ERR(mousedev); 978 979 error = mixdev_add_device(mousedev); 980 if (error) { 981 mousedev_destroy(mousedev); 982 return error; 983 } 984 985 return 0; 986 } 987 988 static void mousedev_disconnect(struct input_handle *handle) 989 { 990 struct mousedev *mousedev = handle->private; 991 992 mixdev_remove_device(mousedev); 993 mousedev_destroy(mousedev); 994 } 995 996 static const struct input_device_id mousedev_ids[] = { 997 { 998 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 999 INPUT_DEVICE_ID_MATCH_KEYBIT | 1000 INPUT_DEVICE_ID_MATCH_RELBIT, 1001 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1002 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1003 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1004 }, /* A mouse like device, at least one button, 1005 two relative axes */ 1006 { 1007 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1008 INPUT_DEVICE_ID_MATCH_RELBIT, 1009 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1010 .relbit = { BIT_MASK(REL_WHEEL) }, 1011 }, /* A separate scrollwheel */ 1012 { 1013 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1014 INPUT_DEVICE_ID_MATCH_KEYBIT | 1015 INPUT_DEVICE_ID_MATCH_ABSBIT, 1016 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1017 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1018 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1019 }, /* A tablet like device, at least touch detection, 1020 two absolute axes */ 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_TOOL_FINGER)] = 1027 BIT_MASK(BTN_TOOL_FINGER) }, 1028 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1029 BIT_MASK(ABS_PRESSURE) | 1030 BIT_MASK(ABS_TOOL_WIDTH) }, 1031 }, /* A touchpad */ 1032 { 1033 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1034 INPUT_DEVICE_ID_MATCH_KEYBIT | 1035 INPUT_DEVICE_ID_MATCH_ABSBIT, 1036 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1037 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1038 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1039 }, /* Mouse-like device with absolute X and Y but ordinary 1040 clicks, like hp ILO2 High Performance mouse */ 1041 1042 { }, /* Terminating entry */ 1043 }; 1044 1045 MODULE_DEVICE_TABLE(input, mousedev_ids); 1046 1047 static struct input_handler mousedev_handler = { 1048 .event = mousedev_event, 1049 .connect = mousedev_connect, 1050 .disconnect = mousedev_disconnect, 1051 .fops = &mousedev_fops, 1052 .minor = MOUSEDEV_MINOR_BASE, 1053 .name = "mousedev", 1054 .id_table = mousedev_ids, 1055 }; 1056 1057 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1058 static struct miscdevice psaux_mouse = { 1059 PSMOUSE_MINOR, "psaux", &mousedev_fops 1060 }; 1061 static int psaux_registered; 1062 #endif 1063 1064 static int __init mousedev_init(void) 1065 { 1066 int error; 1067 1068 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1069 if (IS_ERR(mousedev_mix)) 1070 return PTR_ERR(mousedev_mix); 1071 1072 error = input_register_handler(&mousedev_handler); 1073 if (error) { 1074 mousedev_destroy(mousedev_mix); 1075 return error; 1076 } 1077 1078 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1079 error = misc_register(&psaux_mouse); 1080 if (error) 1081 printk(KERN_WARNING "mice: could not register psaux device, " 1082 "error: %d\n", error); 1083 else 1084 psaux_registered = 1; 1085 #endif 1086 1087 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1088 1089 return 0; 1090 } 1091 1092 static void __exit mousedev_exit(void) 1093 { 1094 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1095 if (psaux_registered) 1096 misc_deregister(&psaux_mouse); 1097 #endif 1098 input_unregister_handler(&mousedev_handler); 1099 mousedev_destroy(mousedev_mix); 1100 } 1101 1102 module_init(mousedev_init); 1103 module_exit(mousedev_exit); 1104