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 kfree(mousedev); 418 } 419 420 static int mousedev_open_device(struct mousedev *mousedev) 421 { 422 int retval; 423 424 retval = mutex_lock_interruptible(&mousedev->mutex); 425 if (retval) 426 return retval; 427 428 if (mousedev->minor == MOUSEDEV_MIX) 429 mixdev_open_devices(); 430 else if (!mousedev->exist) 431 retval = -ENODEV; 432 else if (!mousedev->open++) { 433 retval = input_open_device(&mousedev->handle); 434 if (retval) 435 mousedev->open--; 436 } 437 438 mutex_unlock(&mousedev->mutex); 439 return retval; 440 } 441 442 static void mousedev_close_device(struct mousedev *mousedev) 443 { 444 mutex_lock(&mousedev->mutex); 445 446 if (mousedev->minor == MOUSEDEV_MIX) 447 mixdev_close_devices(); 448 else if (mousedev->exist && !--mousedev->open) 449 input_close_device(&mousedev->handle); 450 451 mutex_unlock(&mousedev->mutex); 452 } 453 454 /* 455 * Open all available devices so they can all be multiplexed in one. 456 * stream. Note that this function is called with mousedev_mix->mutex 457 * held. 458 */ 459 static void mixdev_open_devices(void) 460 { 461 struct mousedev *mousedev; 462 463 if (mousedev_mix->open++) 464 return; 465 466 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 467 if (!mousedev->mixdev_open) { 468 if (mousedev_open_device(mousedev)) 469 continue; 470 471 mousedev->mixdev_open = 1; 472 } 473 } 474 } 475 476 /* 477 * Close all devices that were opened as part of multiplexed 478 * device. Note that this function is called with mousedev_mix->mutex 479 * held. 480 */ 481 static void mixdev_close_devices(void) 482 { 483 struct mousedev *mousedev; 484 485 if (--mousedev_mix->open) 486 return; 487 488 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 489 if (mousedev->mixdev_open) { 490 mousedev->mixdev_open = 0; 491 mousedev_close_device(mousedev); 492 } 493 } 494 } 495 496 497 static void mousedev_attach_client(struct mousedev *mousedev, 498 struct mousedev_client *client) 499 { 500 spin_lock(&mousedev->client_lock); 501 list_add_tail_rcu(&client->node, &mousedev->client_list); 502 spin_unlock(&mousedev->client_lock); 503 synchronize_rcu(); 504 } 505 506 static void mousedev_detach_client(struct mousedev *mousedev, 507 struct mousedev_client *client) 508 { 509 spin_lock(&mousedev->client_lock); 510 list_del_rcu(&client->node); 511 spin_unlock(&mousedev->client_lock); 512 synchronize_rcu(); 513 } 514 515 static int mousedev_release(struct inode *inode, struct file *file) 516 { 517 struct mousedev_client *client = file->private_data; 518 struct mousedev *mousedev = client->mousedev; 519 520 mousedev_fasync(-1, file, 0); 521 mousedev_detach_client(mousedev, client); 522 kfree(client); 523 524 mousedev_close_device(mousedev); 525 put_device(&mousedev->dev); 526 527 return 0; 528 } 529 530 static int mousedev_open(struct inode *inode, struct file *file) 531 { 532 struct mousedev_client *client; 533 struct mousedev *mousedev; 534 int error; 535 int i; 536 537 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 538 if (imajor(inode) == MISC_MAJOR) 539 i = MOUSEDEV_MIX; 540 else 541 #endif 542 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 543 544 if (i >= MOUSEDEV_MINORS) 545 return -ENODEV; 546 547 error = mutex_lock_interruptible(&mousedev_table_mutex); 548 if (error) 549 return error; 550 mousedev = mousedev_table[i]; 551 if (mousedev) 552 get_device(&mousedev->dev); 553 mutex_unlock(&mousedev_table_mutex); 554 555 if (!mousedev) 556 return -ENODEV; 557 558 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 559 if (!client) { 560 error = -ENOMEM; 561 goto err_put_mousedev; 562 } 563 564 spin_lock_init(&client->packet_lock); 565 client->pos_x = xres / 2; 566 client->pos_y = yres / 2; 567 client->mousedev = mousedev; 568 mousedev_attach_client(mousedev, client); 569 570 error = mousedev_open_device(mousedev); 571 if (error) 572 goto err_free_client; 573 574 file->private_data = client; 575 return 0; 576 577 err_free_client: 578 mousedev_detach_client(mousedev, client); 579 kfree(client); 580 err_put_mousedev: 581 put_device(&mousedev->dev); 582 return error; 583 } 584 585 static inline int mousedev_limit_delta(int delta, int limit) 586 { 587 return delta > limit ? limit : (delta < -limit ? -limit : delta); 588 } 589 590 static void mousedev_packet(struct mousedev_client *client, 591 signed char *ps2_data) 592 { 593 struct mousedev_motion *p = &client->packets[client->tail]; 594 595 ps2_data[0] = 0x08 | 596 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 597 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 598 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 599 p->dx -= ps2_data[1]; 600 p->dy -= ps2_data[2]; 601 602 switch (client->mode) { 603 case MOUSEDEV_EMUL_EXPS: 604 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 605 p->dz -= ps2_data[3]; 606 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 607 client->bufsiz = 4; 608 break; 609 610 case MOUSEDEV_EMUL_IMPS: 611 ps2_data[0] |= 612 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 613 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 614 p->dz -= ps2_data[3]; 615 client->bufsiz = 4; 616 break; 617 618 case MOUSEDEV_EMUL_PS2: 619 default: 620 ps2_data[0] |= 621 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 622 p->dz = 0; 623 client->bufsiz = 3; 624 break; 625 } 626 627 if (!p->dx && !p->dy && !p->dz) { 628 if (client->tail == client->head) { 629 client->ready = 0; 630 client->last_buttons = p->buttons; 631 } else 632 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 633 } 634 } 635 636 static void mousedev_generate_response(struct mousedev_client *client, 637 int command) 638 { 639 client->ps2[0] = 0xfa; /* ACK */ 640 641 switch (command) { 642 643 case 0xeb: /* Poll */ 644 mousedev_packet(client, &client->ps2[1]); 645 client->bufsiz++; /* account for leading ACK */ 646 break; 647 648 case 0xf2: /* Get ID */ 649 switch (client->mode) { 650 case MOUSEDEV_EMUL_PS2: 651 client->ps2[1] = 0; 652 break; 653 case MOUSEDEV_EMUL_IMPS: 654 client->ps2[1] = 3; 655 break; 656 case MOUSEDEV_EMUL_EXPS: 657 client->ps2[1] = 4; 658 break; 659 } 660 client->bufsiz = 2; 661 break; 662 663 case 0xe9: /* Get info */ 664 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 665 client->bufsiz = 4; 666 break; 667 668 case 0xff: /* Reset */ 669 client->impsseq = client->imexseq = 0; 670 client->mode = MOUSEDEV_EMUL_PS2; 671 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 672 client->bufsiz = 3; 673 break; 674 675 default: 676 client->bufsiz = 1; 677 break; 678 } 679 client->buffer = client->bufsiz; 680 } 681 682 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 683 size_t count, loff_t *ppos) 684 { 685 struct mousedev_client *client = file->private_data; 686 unsigned char c; 687 unsigned int i; 688 689 for (i = 0; i < count; i++) { 690 691 if (get_user(c, buffer + i)) 692 return -EFAULT; 693 694 spin_lock_irq(&client->packet_lock); 695 696 if (c == mousedev_imex_seq[client->imexseq]) { 697 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 698 client->imexseq = 0; 699 client->mode = MOUSEDEV_EMUL_EXPS; 700 } 701 } else 702 client->imexseq = 0; 703 704 if (c == mousedev_imps_seq[client->impsseq]) { 705 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 706 client->impsseq = 0; 707 client->mode = MOUSEDEV_EMUL_IMPS; 708 } 709 } else 710 client->impsseq = 0; 711 712 mousedev_generate_response(client, c); 713 714 spin_unlock_irq(&client->packet_lock); 715 } 716 717 kill_fasync(&client->fasync, SIGIO, POLL_IN); 718 wake_up_interruptible(&client->mousedev->wait); 719 720 return count; 721 } 722 723 static ssize_t mousedev_read(struct file *file, char __user *buffer, 724 size_t count, loff_t *ppos) 725 { 726 struct mousedev_client *client = file->private_data; 727 struct mousedev *mousedev = client->mousedev; 728 signed char data[sizeof(client->ps2)]; 729 int retval = 0; 730 731 if (!client->ready && !client->buffer && mousedev->exist && 732 (file->f_flags & O_NONBLOCK)) 733 return -EAGAIN; 734 735 retval = wait_event_interruptible(mousedev->wait, 736 !mousedev->exist || client->ready || client->buffer); 737 if (retval) 738 return retval; 739 740 if (!mousedev->exist) 741 return -ENODEV; 742 743 spin_lock_irq(&client->packet_lock); 744 745 if (!client->buffer && client->ready) { 746 mousedev_packet(client, client->ps2); 747 client->buffer = client->bufsiz; 748 } 749 750 if (count > client->buffer) 751 count = client->buffer; 752 753 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 754 client->buffer -= count; 755 756 spin_unlock_irq(&client->packet_lock); 757 758 if (copy_to_user(buffer, data, count)) 759 return -EFAULT; 760 761 return count; 762 } 763 764 /* No kernel lock - fine */ 765 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 766 { 767 struct mousedev_client *client = file->private_data; 768 struct mousedev *mousedev = client->mousedev; 769 770 poll_wait(file, &mousedev->wait, wait); 771 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) | 772 (mousedev->exist ? 0 : (POLLHUP | POLLERR)); 773 } 774 775 static const struct file_operations mousedev_fops = { 776 .owner = THIS_MODULE, 777 .read = mousedev_read, 778 .write = mousedev_write, 779 .poll = mousedev_poll, 780 .open = mousedev_open, 781 .release = mousedev_release, 782 .fasync = mousedev_fasync, 783 }; 784 785 static int mousedev_install_chrdev(struct mousedev *mousedev) 786 { 787 mousedev_table[mousedev->minor] = mousedev; 788 return 0; 789 } 790 791 static void mousedev_remove_chrdev(struct mousedev *mousedev) 792 { 793 mutex_lock(&mousedev_table_mutex); 794 mousedev_table[mousedev->minor] = NULL; 795 mutex_unlock(&mousedev_table_mutex); 796 } 797 798 /* 799 * Mark device non-existent. This disables writes, ioctls and 800 * prevents new users from opening the device. Already posted 801 * blocking reads will stay, however new ones will fail. 802 */ 803 static void mousedev_mark_dead(struct mousedev *mousedev) 804 { 805 mutex_lock(&mousedev->mutex); 806 mousedev->exist = 0; 807 mutex_unlock(&mousedev->mutex); 808 } 809 810 /* 811 * Wake up users waiting for IO so they can disconnect from 812 * dead device. 813 */ 814 static void mousedev_hangup(struct mousedev *mousedev) 815 { 816 struct mousedev_client *client; 817 818 spin_lock(&mousedev->client_lock); 819 list_for_each_entry(client, &mousedev->client_list, node) 820 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 821 spin_unlock(&mousedev->client_lock); 822 823 wake_up_interruptible(&mousedev->wait); 824 } 825 826 static void mousedev_cleanup(struct mousedev *mousedev) 827 { 828 struct input_handle *handle = &mousedev->handle; 829 830 mousedev_mark_dead(mousedev); 831 mousedev_hangup(mousedev); 832 mousedev_remove_chrdev(mousedev); 833 834 /* mousedev is marked dead so no one else accesses mousedev->open */ 835 if (mousedev->open) 836 input_close_device(handle); 837 } 838 839 static struct mousedev *mousedev_create(struct input_dev *dev, 840 struct input_handler *handler, 841 int minor) 842 { 843 struct mousedev *mousedev; 844 int error; 845 846 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 847 if (!mousedev) { 848 error = -ENOMEM; 849 goto err_out; 850 } 851 852 INIT_LIST_HEAD(&mousedev->client_list); 853 INIT_LIST_HEAD(&mousedev->mixdev_node); 854 spin_lock_init(&mousedev->client_lock); 855 mutex_init(&mousedev->mutex); 856 lockdep_set_subclass(&mousedev->mutex, 857 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 858 init_waitqueue_head(&mousedev->wait); 859 860 if (minor == MOUSEDEV_MIX) 861 strlcpy(mousedev->name, "mice", sizeof(mousedev->name)); 862 else 863 snprintf(mousedev->name, sizeof(mousedev->name), 864 "mouse%d", minor); 865 866 mousedev->minor = minor; 867 mousedev->exist = 1; 868 mousedev->handle.dev = dev; 869 mousedev->handle.name = mousedev->name; 870 mousedev->handle.handler = handler; 871 mousedev->handle.private = mousedev; 872 873 strlcpy(mousedev->dev.bus_id, mousedev->name, 874 sizeof(mousedev->dev.bus_id)); 875 mousedev->dev.class = &input_class; 876 if (dev) 877 mousedev->dev.parent = &dev->dev; 878 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 879 mousedev->dev.release = mousedev_free; 880 device_initialize(&mousedev->dev); 881 882 if (minor != MOUSEDEV_MIX) { 883 error = input_register_handle(&mousedev->handle); 884 if (error) 885 goto err_free_mousedev; 886 } 887 888 error = mousedev_install_chrdev(mousedev); 889 if (error) 890 goto err_unregister_handle; 891 892 error = device_add(&mousedev->dev); 893 if (error) 894 goto err_cleanup_mousedev; 895 896 return mousedev; 897 898 err_cleanup_mousedev: 899 mousedev_cleanup(mousedev); 900 err_unregister_handle: 901 if (minor != MOUSEDEV_MIX) 902 input_unregister_handle(&mousedev->handle); 903 err_free_mousedev: 904 put_device(&mousedev->dev); 905 err_out: 906 return ERR_PTR(error); 907 } 908 909 static void mousedev_destroy(struct mousedev *mousedev) 910 { 911 device_del(&mousedev->dev); 912 mousedev_cleanup(mousedev); 913 if (mousedev->minor != MOUSEDEV_MIX) 914 input_unregister_handle(&mousedev->handle); 915 put_device(&mousedev->dev); 916 } 917 918 static int mixdev_add_device(struct mousedev *mousedev) 919 { 920 int retval; 921 922 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 923 if (retval) 924 return retval; 925 926 if (mousedev_mix->open) { 927 retval = mousedev_open_device(mousedev); 928 if (retval) 929 goto out; 930 931 mousedev->mixdev_open = 1; 932 } 933 934 get_device(&mousedev->dev); 935 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 936 937 out: 938 mutex_unlock(&mousedev_mix->mutex); 939 return retval; 940 } 941 942 static void mixdev_remove_device(struct mousedev *mousedev) 943 { 944 mutex_lock(&mousedev_mix->mutex); 945 946 if (mousedev->mixdev_open) { 947 mousedev->mixdev_open = 0; 948 mousedev_close_device(mousedev); 949 } 950 951 list_del_init(&mousedev->mixdev_node); 952 mutex_unlock(&mousedev_mix->mutex); 953 954 put_device(&mousedev->dev); 955 } 956 957 static int mousedev_connect(struct input_handler *handler, 958 struct input_dev *dev, 959 const struct input_device_id *id) 960 { 961 struct mousedev *mousedev; 962 int minor; 963 int error; 964 965 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 966 if (!mousedev_table[minor]) 967 break; 968 969 if (minor == MOUSEDEV_MINORS) { 970 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 971 return -ENFILE; 972 } 973 974 mousedev = mousedev_create(dev, handler, minor); 975 if (IS_ERR(mousedev)) 976 return PTR_ERR(mousedev); 977 978 error = mixdev_add_device(mousedev); 979 if (error) { 980 mousedev_destroy(mousedev); 981 return error; 982 } 983 984 return 0; 985 } 986 987 static void mousedev_disconnect(struct input_handle *handle) 988 { 989 struct mousedev *mousedev = handle->private; 990 991 mixdev_remove_device(mousedev); 992 mousedev_destroy(mousedev); 993 } 994 995 static const struct input_device_id mousedev_ids[] = { 996 { 997 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 998 INPUT_DEVICE_ID_MATCH_KEYBIT | 999 INPUT_DEVICE_ID_MATCH_RELBIT, 1000 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1001 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1002 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1003 }, /* A mouse like device, at least one button, 1004 two relative axes */ 1005 { 1006 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1007 INPUT_DEVICE_ID_MATCH_RELBIT, 1008 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1009 .relbit = { BIT_MASK(REL_WHEEL) }, 1010 }, /* A separate scrollwheel */ 1011 { 1012 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1013 INPUT_DEVICE_ID_MATCH_KEYBIT | 1014 INPUT_DEVICE_ID_MATCH_ABSBIT, 1015 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1016 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1017 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1018 }, /* A tablet like device, at least touch detection, 1019 two absolute axes */ 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_TOOL_FINGER)] = 1026 BIT_MASK(BTN_TOOL_FINGER) }, 1027 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1028 BIT_MASK(ABS_PRESSURE) | 1029 BIT_MASK(ABS_TOOL_WIDTH) }, 1030 }, /* A touchpad */ 1031 { 1032 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1033 INPUT_DEVICE_ID_MATCH_KEYBIT | 1034 INPUT_DEVICE_ID_MATCH_ABSBIT, 1035 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1036 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1037 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1038 }, /* Mouse-like device with absolute X and Y but ordinary 1039 clicks, like hp ILO2 High Performance mouse */ 1040 1041 { }, /* Terminating entry */ 1042 }; 1043 1044 MODULE_DEVICE_TABLE(input, mousedev_ids); 1045 1046 static struct input_handler mousedev_handler = { 1047 .event = mousedev_event, 1048 .connect = mousedev_connect, 1049 .disconnect = mousedev_disconnect, 1050 .fops = &mousedev_fops, 1051 .minor = MOUSEDEV_MINOR_BASE, 1052 .name = "mousedev", 1053 .id_table = mousedev_ids, 1054 }; 1055 1056 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1057 static struct miscdevice psaux_mouse = { 1058 PSMOUSE_MINOR, "psaux", &mousedev_fops 1059 }; 1060 static int psaux_registered; 1061 #endif 1062 1063 static int __init mousedev_init(void) 1064 { 1065 int error; 1066 1067 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1068 if (IS_ERR(mousedev_mix)) 1069 return PTR_ERR(mousedev_mix); 1070 1071 error = input_register_handler(&mousedev_handler); 1072 if (error) { 1073 mousedev_destroy(mousedev_mix); 1074 return error; 1075 } 1076 1077 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1078 error = misc_register(&psaux_mouse); 1079 if (error) 1080 printk(KERN_WARNING "mice: could not register psaux device, " 1081 "error: %d\n", error); 1082 else 1083 psaux_registered = 1; 1084 #endif 1085 1086 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1087 1088 return 0; 1089 } 1090 1091 static void __exit mousedev_exit(void) 1092 { 1093 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1094 if (psaux_registered) 1095 misc_deregister(&psaux_mouse); 1096 #endif 1097 input_unregister_handler(&mousedev_handler); 1098 mousedev_destroy(mousedev_mix); 1099 } 1100 1101 module_init(mousedev_init); 1102 module_exit(mousedev_exit); 1103