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/smp_lock.h> 19 #include <linux/poll.h> 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/input.h> 23 #include <linux/random.h> 24 #include <linux/major.h> 25 #include <linux/device.h> 26 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 27 #include <linux/miscdevice.h> 28 #endif 29 30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 31 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 32 MODULE_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 41 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 42 module_param(xres, uint, 0644); 43 MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 44 45 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 46 module_param(yres, uint, 0644); 47 MODULE_PARM_DESC(yres, "Vertical screen resolution"); 48 49 static unsigned tap_time = 200; 50 module_param(tap_time, uint, 0644); 51 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 52 53 struct mousedev_hw_data { 54 int dx, dy, dz; 55 int x, y; 56 int abs_event; 57 unsigned long buttons; 58 }; 59 60 struct mousedev { 61 int exist; 62 int open; 63 int minor; 64 struct input_handle handle; 65 wait_queue_head_t wait; 66 struct list_head client_list; 67 spinlock_t client_lock; /* protects client_list */ 68 struct mutex mutex; 69 struct device dev; 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 81 enum mousedev_emul { 82 MOUSEDEV_EMUL_PS2, 83 MOUSEDEV_EMUL_IMPS, 84 MOUSEDEV_EMUL_EXPS 85 }; 86 87 struct mousedev_motion { 88 int dx, dy, dz; 89 unsigned long buttons; 90 }; 91 92 #define PACKET_QUEUE_LEN 16 93 struct 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 6 111 112 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 113 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 114 115 static struct input_handler mousedev_handler; 116 117 static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; 118 static DEFINE_MUTEX(mousedev_table_mutex); 119 static struct mousedev *mousedev_mix; 120 static LIST_HEAD(mousedev_mix_list); 121 122 static void mixdev_open_devices(void); 123 static 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]) 127 128 static 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 fx(0) = value; 139 if (mousedev->touch && mousedev->pkt_count >= 2) { 140 size = dev->absmax[ABS_X] - dev->absmin[ABS_X]; 141 if (size == 0) 142 size = 256 * 2; 143 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; 144 tmp += mousedev->frac_dx; 145 mousedev->packet.dx = tmp / FRACTION_DENOM; 146 mousedev->frac_dx = 147 tmp - mousedev->packet.dx * FRACTION_DENOM; 148 } 149 break; 150 151 case ABS_Y: 152 fy(0) = value; 153 if (mousedev->touch && mousedev->pkt_count >= 2) { 154 /* use X size to keep the same scale */ 155 size = dev->absmax[ABS_X] - dev->absmin[ABS_X]; 156 if (size == 0) 157 size = 256 * 2; 158 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; 159 tmp += mousedev->frac_dy; 160 mousedev->packet.dy = tmp / FRACTION_DENOM; 161 mousedev->frac_dy = tmp - 162 mousedev->packet.dy * FRACTION_DENOM; 163 } 164 break; 165 } 166 } 167 168 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, 169 unsigned int code, int value) 170 { 171 int size; 172 173 switch (code) { 174 175 case ABS_X: 176 size = dev->absmax[ABS_X] - dev->absmin[ABS_X]; 177 if (size == 0) 178 size = xres ? : 1; 179 if (value > dev->absmax[ABS_X]) 180 value = dev->absmax[ABS_X]; 181 if (value < dev->absmin[ABS_X]) 182 value = dev->absmin[ABS_X]; 183 mousedev->packet.x = 184 ((value - dev->absmin[ABS_X]) * xres) / size; 185 mousedev->packet.abs_event = 1; 186 break; 187 188 case ABS_Y: 189 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y]; 190 if (size == 0) 191 size = yres ? : 1; 192 if (value > dev->absmax[ABS_Y]) 193 value = dev->absmax[ABS_Y]; 194 if (value < dev->absmin[ABS_Y]) 195 value = dev->absmin[ABS_Y]; 196 mousedev->packet.y = yres - 197 ((value - dev->absmin[ABS_Y]) * yres) / size; 198 mousedev->packet.abs_event = 1; 199 break; 200 } 201 } 202 203 static void mousedev_rel_event(struct mousedev *mousedev, 204 unsigned int code, int value) 205 { 206 switch (code) { 207 case REL_X: 208 mousedev->packet.dx += value; 209 break; 210 211 case REL_Y: 212 mousedev->packet.dy -= value; 213 break; 214 215 case REL_WHEEL: 216 mousedev->packet.dz -= value; 217 break; 218 } 219 } 220 221 static void mousedev_key_event(struct mousedev *mousedev, 222 unsigned int code, int value) 223 { 224 int index; 225 226 switch (code) { 227 228 case BTN_TOUCH: 229 case BTN_0: 230 case BTN_LEFT: index = 0; break; 231 232 case BTN_STYLUS: 233 case BTN_1: 234 case BTN_RIGHT: index = 1; break; 235 236 case BTN_2: 237 case BTN_FORWARD: 238 case BTN_STYLUS2: 239 case BTN_MIDDLE: index = 2; break; 240 241 case BTN_3: 242 case BTN_BACK: 243 case BTN_SIDE: index = 3; break; 244 245 case BTN_4: 246 case BTN_EXTRA: index = 4; break; 247 248 default: return; 249 } 250 251 if (value) { 252 set_bit(index, &mousedev->packet.buttons); 253 set_bit(index, &mousedev_mix->packet.buttons); 254 } else { 255 clear_bit(index, &mousedev->packet.buttons); 256 clear_bit(index, &mousedev_mix->packet.buttons); 257 } 258 } 259 260 static void mousedev_notify_readers(struct mousedev *mousedev, 261 struct mousedev_hw_data *packet) 262 { 263 struct mousedev_client *client; 264 struct mousedev_motion *p; 265 unsigned int new_head; 266 int wake_readers = 0; 267 268 rcu_read_lock(); 269 list_for_each_entry_rcu(client, &mousedev->client_list, node) { 270 271 /* Just acquire the lock, interrupts already disabled */ 272 spin_lock(&client->packet_lock); 273 274 p = &client->packets[client->head]; 275 if (client->ready && p->buttons != mousedev->packet.buttons) { 276 new_head = (client->head + 1) % PACKET_QUEUE_LEN; 277 if (new_head != client->tail) { 278 p = &client->packets[client->head = new_head]; 279 memset(p, 0, sizeof(struct mousedev_motion)); 280 } 281 } 282 283 if (packet->abs_event) { 284 p->dx += packet->x - client->pos_x; 285 p->dy += packet->y - client->pos_y; 286 client->pos_x = packet->x; 287 client->pos_y = packet->y; 288 } 289 290 client->pos_x += packet->dx; 291 client->pos_x = client->pos_x < 0 ? 292 0 : (client->pos_x >= xres ? xres : client->pos_x); 293 client->pos_y += packet->dy; 294 client->pos_y = client->pos_y < 0 ? 295 0 : (client->pos_y >= yres ? yres : client->pos_y); 296 297 p->dx += packet->dx; 298 p->dy += packet->dy; 299 p->dz += packet->dz; 300 p->buttons = mousedev->packet.buttons; 301 302 if (p->dx || p->dy || p->dz || 303 p->buttons != client->last_buttons) 304 client->ready = 1; 305 306 spin_unlock(&client->packet_lock); 307 308 if (client->ready) { 309 kill_fasync(&client->fasync, SIGIO, POLL_IN); 310 wake_readers = 1; 311 } 312 } 313 rcu_read_unlock(); 314 315 if (wake_readers) 316 wake_up_interruptible(&mousedev->wait); 317 } 318 319 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) 320 { 321 if (!value) { 322 if (mousedev->touch && 323 time_before(jiffies, 324 mousedev->touch + msecs_to_jiffies(tap_time))) { 325 /* 326 * Toggle left button to emulate tap. 327 * We rely on the fact that mousedev_mix always has 0 328 * motion packet so we won't mess current position. 329 */ 330 set_bit(0, &mousedev->packet.buttons); 331 set_bit(0, &mousedev_mix->packet.buttons); 332 mousedev_notify_readers(mousedev, &mousedev_mix->packet); 333 mousedev_notify_readers(mousedev_mix, 334 &mousedev_mix->packet); 335 clear_bit(0, &mousedev->packet.buttons); 336 clear_bit(0, &mousedev_mix->packet.buttons); 337 } 338 mousedev->touch = mousedev->pkt_count = 0; 339 mousedev->frac_dx = 0; 340 mousedev->frac_dy = 0; 341 342 } else if (!mousedev->touch) 343 mousedev->touch = jiffies; 344 } 345 346 static void mousedev_event(struct input_handle *handle, 347 unsigned int type, unsigned int code, int value) 348 { 349 struct mousedev *mousedev = handle->private; 350 351 switch (type) { 352 353 case EV_ABS: 354 /* Ignore joysticks */ 355 if (test_bit(BTN_TRIGGER, handle->dev->keybit)) 356 return; 357 358 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 359 mousedev_touchpad_event(handle->dev, 360 mousedev, code, value); 361 else 362 mousedev_abs_event(handle->dev, mousedev, code, value); 363 364 break; 365 366 case EV_REL: 367 mousedev_rel_event(mousedev, code, value); 368 break; 369 370 case EV_KEY: 371 if (value != 2) { 372 if (code == BTN_TOUCH && 373 test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 374 mousedev_touchpad_touch(mousedev, value); 375 else 376 mousedev_key_event(mousedev, code, value); 377 } 378 break; 379 380 case EV_SYN: 381 if (code == SYN_REPORT) { 382 if (mousedev->touch) { 383 mousedev->pkt_count++; 384 /* 385 * Input system eats duplicate events, 386 * but we need all of them to do correct 387 * averaging so apply present one forward 388 */ 389 fx(0) = fx(1); 390 fy(0) = fy(1); 391 } 392 393 mousedev_notify_readers(mousedev, &mousedev->packet); 394 mousedev_notify_readers(mousedev_mix, &mousedev->packet); 395 396 mousedev->packet.dx = mousedev->packet.dy = 397 mousedev->packet.dz = 0; 398 mousedev->packet.abs_event = 0; 399 } 400 break; 401 } 402 } 403 404 static int mousedev_fasync(int fd, struct file *file, int on) 405 { 406 struct mousedev_client *client = file->private_data; 407 408 return fasync_helper(fd, file, on, &client->fasync); 409 } 410 411 static void mousedev_free(struct device *dev) 412 { 413 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 414 415 input_put_device(mousedev->handle.dev); 416 kfree(mousedev); 417 } 418 419 static int mousedev_open_device(struct mousedev *mousedev) 420 { 421 int retval; 422 423 retval = mutex_lock_interruptible(&mousedev->mutex); 424 if (retval) 425 return retval; 426 427 if (mousedev->minor == MOUSEDEV_MIX) 428 mixdev_open_devices(); 429 else if (!mousedev->exist) 430 retval = -ENODEV; 431 else if (!mousedev->open++) { 432 retval = input_open_device(&mousedev->handle); 433 if (retval) 434 mousedev->open--; 435 } 436 437 mutex_unlock(&mousedev->mutex); 438 return retval; 439 } 440 441 static void mousedev_close_device(struct mousedev *mousedev) 442 { 443 mutex_lock(&mousedev->mutex); 444 445 if (mousedev->minor == MOUSEDEV_MIX) 446 mixdev_close_devices(); 447 else if (mousedev->exist && !--mousedev->open) 448 input_close_device(&mousedev->handle); 449 450 mutex_unlock(&mousedev->mutex); 451 } 452 453 /* 454 * Open all available devices so they can all be multiplexed in one. 455 * stream. Note that this function is called with mousedev_mix->mutex 456 * held. 457 */ 458 static void mixdev_open_devices(void) 459 { 460 struct mousedev *mousedev; 461 462 if (mousedev_mix->open++) 463 return; 464 465 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 466 if (!mousedev->mixdev_open) { 467 if (mousedev_open_device(mousedev)) 468 continue; 469 470 mousedev->mixdev_open = 1; 471 } 472 } 473 } 474 475 /* 476 * Close all devices that were opened as part of multiplexed 477 * device. Note that this function is called with mousedev_mix->mutex 478 * held. 479 */ 480 static void mixdev_close_devices(void) 481 { 482 struct mousedev *mousedev; 483 484 if (--mousedev_mix->open) 485 return; 486 487 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 488 if (mousedev->mixdev_open) { 489 mousedev->mixdev_open = 0; 490 mousedev_close_device(mousedev); 491 } 492 } 493 } 494 495 496 static void mousedev_attach_client(struct mousedev *mousedev, 497 struct mousedev_client *client) 498 { 499 spin_lock(&mousedev->client_lock); 500 list_add_tail_rcu(&client->node, &mousedev->client_list); 501 spin_unlock(&mousedev->client_lock); 502 synchronize_rcu(); 503 } 504 505 static void mousedev_detach_client(struct mousedev *mousedev, 506 struct mousedev_client *client) 507 { 508 spin_lock(&mousedev->client_lock); 509 list_del_rcu(&client->node); 510 spin_unlock(&mousedev->client_lock); 511 synchronize_rcu(); 512 } 513 514 static int mousedev_release(struct inode *inode, struct file *file) 515 { 516 struct mousedev_client *client = file->private_data; 517 struct mousedev *mousedev = client->mousedev; 518 519 mousedev_detach_client(mousedev, client); 520 kfree(client); 521 522 mousedev_close_device(mousedev); 523 put_device(&mousedev->dev); 524 525 return 0; 526 } 527 528 static int mousedev_open(struct inode *inode, struct file *file) 529 { 530 struct mousedev_client *client; 531 struct mousedev *mousedev; 532 int error; 533 int i; 534 535 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 536 if (imajor(inode) == MISC_MAJOR) 537 i = MOUSEDEV_MIX; 538 else 539 #endif 540 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 541 542 if (i >= MOUSEDEV_MINORS) 543 return -ENODEV; 544 545 lock_kernel(); 546 error = mutex_lock_interruptible(&mousedev_table_mutex); 547 if (error) { 548 unlock_kernel(); 549 return error; 550 } 551 mousedev = mousedev_table[i]; 552 if (mousedev) 553 get_device(&mousedev->dev); 554 mutex_unlock(&mousedev_table_mutex); 555 556 if (!mousedev) { 557 unlock_kernel(); 558 return -ENODEV; 559 } 560 561 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 562 if (!client) { 563 error = -ENOMEM; 564 goto err_put_mousedev; 565 } 566 567 spin_lock_init(&client->packet_lock); 568 client->pos_x = xres / 2; 569 client->pos_y = yres / 2; 570 client->mousedev = mousedev; 571 mousedev_attach_client(mousedev, client); 572 573 error = mousedev_open_device(mousedev); 574 if (error) 575 goto err_free_client; 576 577 file->private_data = client; 578 unlock_kernel(); 579 return 0; 580 581 err_free_client: 582 mousedev_detach_client(mousedev, client); 583 kfree(client); 584 err_put_mousedev: 585 put_device(&mousedev->dev); 586 unlock_kernel(); 587 return error; 588 } 589 590 static inline int mousedev_limit_delta(int delta, int limit) 591 { 592 return delta > limit ? limit : (delta < -limit ? -limit : delta); 593 } 594 595 static void mousedev_packet(struct mousedev_client *client, 596 signed char *ps2_data) 597 { 598 struct mousedev_motion *p = &client->packets[client->tail]; 599 600 ps2_data[0] = 0x08 | 601 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 602 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 603 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 604 p->dx -= ps2_data[1]; 605 p->dy -= ps2_data[2]; 606 607 switch (client->mode) { 608 case MOUSEDEV_EMUL_EXPS: 609 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 610 p->dz -= ps2_data[3]; 611 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 612 client->bufsiz = 4; 613 break; 614 615 case MOUSEDEV_EMUL_IMPS: 616 ps2_data[0] |= 617 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 618 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 619 p->dz -= ps2_data[3]; 620 client->bufsiz = 4; 621 break; 622 623 case MOUSEDEV_EMUL_PS2: 624 default: 625 ps2_data[0] |= 626 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 627 p->dz = 0; 628 client->bufsiz = 3; 629 break; 630 } 631 632 if (!p->dx && !p->dy && !p->dz) { 633 if (client->tail == client->head) { 634 client->ready = 0; 635 client->last_buttons = p->buttons; 636 } else 637 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 638 } 639 } 640 641 static void mousedev_generate_response(struct mousedev_client *client, 642 int command) 643 { 644 client->ps2[0] = 0xfa; /* ACK */ 645 646 switch (command) { 647 648 case 0xeb: /* Poll */ 649 mousedev_packet(client, &client->ps2[1]); 650 client->bufsiz++; /* account for leading ACK */ 651 break; 652 653 case 0xf2: /* Get ID */ 654 switch (client->mode) { 655 case MOUSEDEV_EMUL_PS2: 656 client->ps2[1] = 0; 657 break; 658 case MOUSEDEV_EMUL_IMPS: 659 client->ps2[1] = 3; 660 break; 661 case MOUSEDEV_EMUL_EXPS: 662 client->ps2[1] = 4; 663 break; 664 } 665 client->bufsiz = 2; 666 break; 667 668 case 0xe9: /* Get info */ 669 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 670 client->bufsiz = 4; 671 break; 672 673 case 0xff: /* Reset */ 674 client->impsseq = client->imexseq = 0; 675 client->mode = MOUSEDEV_EMUL_PS2; 676 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 677 client->bufsiz = 3; 678 break; 679 680 default: 681 client->bufsiz = 1; 682 break; 683 } 684 client->buffer = client->bufsiz; 685 } 686 687 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 688 size_t count, loff_t *ppos) 689 { 690 struct mousedev_client *client = file->private_data; 691 unsigned char c; 692 unsigned int i; 693 694 for (i = 0; i < count; i++) { 695 696 if (get_user(c, buffer + i)) 697 return -EFAULT; 698 699 spin_lock_irq(&client->packet_lock); 700 701 if (c == mousedev_imex_seq[client->imexseq]) { 702 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 703 client->imexseq = 0; 704 client->mode = MOUSEDEV_EMUL_EXPS; 705 } 706 } else 707 client->imexseq = 0; 708 709 if (c == mousedev_imps_seq[client->impsseq]) { 710 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 711 client->impsseq = 0; 712 client->mode = MOUSEDEV_EMUL_IMPS; 713 } 714 } else 715 client->impsseq = 0; 716 717 mousedev_generate_response(client, c); 718 719 spin_unlock_irq(&client->packet_lock); 720 } 721 722 kill_fasync(&client->fasync, SIGIO, POLL_IN); 723 wake_up_interruptible(&client->mousedev->wait); 724 725 return count; 726 } 727 728 static ssize_t mousedev_read(struct file *file, char __user *buffer, 729 size_t count, loff_t *ppos) 730 { 731 struct mousedev_client *client = file->private_data; 732 struct mousedev *mousedev = client->mousedev; 733 signed char data[sizeof(client->ps2)]; 734 int retval = 0; 735 736 if (!client->ready && !client->buffer && mousedev->exist && 737 (file->f_flags & O_NONBLOCK)) 738 return -EAGAIN; 739 740 retval = wait_event_interruptible(mousedev->wait, 741 !mousedev->exist || client->ready || client->buffer); 742 if (retval) 743 return retval; 744 745 if (!mousedev->exist) 746 return -ENODEV; 747 748 spin_lock_irq(&client->packet_lock); 749 750 if (!client->buffer && client->ready) { 751 mousedev_packet(client, client->ps2); 752 client->buffer = client->bufsiz; 753 } 754 755 if (count > client->buffer) 756 count = client->buffer; 757 758 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 759 client->buffer -= count; 760 761 spin_unlock_irq(&client->packet_lock); 762 763 if (copy_to_user(buffer, data, count)) 764 return -EFAULT; 765 766 return count; 767 } 768 769 /* No kernel lock - fine */ 770 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 771 { 772 struct mousedev_client *client = file->private_data; 773 struct mousedev *mousedev = client->mousedev; 774 775 poll_wait(file, &mousedev->wait, wait); 776 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) | 777 (mousedev->exist ? 0 : (POLLHUP | POLLERR)); 778 } 779 780 static const struct file_operations mousedev_fops = { 781 .owner = THIS_MODULE, 782 .read = mousedev_read, 783 .write = mousedev_write, 784 .poll = mousedev_poll, 785 .open = mousedev_open, 786 .release = mousedev_release, 787 .fasync = mousedev_fasync, 788 }; 789 790 static int mousedev_install_chrdev(struct mousedev *mousedev) 791 { 792 mousedev_table[mousedev->minor] = mousedev; 793 return 0; 794 } 795 796 static void mousedev_remove_chrdev(struct mousedev *mousedev) 797 { 798 mutex_lock(&mousedev_table_mutex); 799 mousedev_table[mousedev->minor] = NULL; 800 mutex_unlock(&mousedev_table_mutex); 801 } 802 803 /* 804 * Mark device non-existent. This disables writes, ioctls and 805 * prevents new users from opening the device. Already posted 806 * blocking reads will stay, however new ones will fail. 807 */ 808 static void mousedev_mark_dead(struct mousedev *mousedev) 809 { 810 mutex_lock(&mousedev->mutex); 811 mousedev->exist = 0; 812 mutex_unlock(&mousedev->mutex); 813 } 814 815 /* 816 * Wake up users waiting for IO so they can disconnect from 817 * dead device. 818 */ 819 static void mousedev_hangup(struct mousedev *mousedev) 820 { 821 struct mousedev_client *client; 822 823 spin_lock(&mousedev->client_lock); 824 list_for_each_entry(client, &mousedev->client_list, node) 825 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 826 spin_unlock(&mousedev->client_lock); 827 828 wake_up_interruptible(&mousedev->wait); 829 } 830 831 static void mousedev_cleanup(struct mousedev *mousedev) 832 { 833 struct input_handle *handle = &mousedev->handle; 834 835 mousedev_mark_dead(mousedev); 836 mousedev_hangup(mousedev); 837 mousedev_remove_chrdev(mousedev); 838 839 /* mousedev is marked dead so no one else accesses mousedev->open */ 840 if (mousedev->open) 841 input_close_device(handle); 842 } 843 844 static struct mousedev *mousedev_create(struct input_dev *dev, 845 struct input_handler *handler, 846 int minor) 847 { 848 struct mousedev *mousedev; 849 int error; 850 851 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 852 if (!mousedev) { 853 error = -ENOMEM; 854 goto err_out; 855 } 856 857 INIT_LIST_HEAD(&mousedev->client_list); 858 INIT_LIST_HEAD(&mousedev->mixdev_node); 859 spin_lock_init(&mousedev->client_lock); 860 mutex_init(&mousedev->mutex); 861 lockdep_set_subclass(&mousedev->mutex, 862 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 863 init_waitqueue_head(&mousedev->wait); 864 865 if (minor == MOUSEDEV_MIX) 866 dev_set_name(&mousedev->dev, "mice"); 867 else 868 dev_set_name(&mousedev->dev, "mouse%d", minor); 869 870 mousedev->minor = minor; 871 mousedev->exist = 1; 872 mousedev->handle.dev = input_get_device(dev); 873 mousedev->handle.name = dev_name(&mousedev->dev); 874 mousedev->handle.handler = handler; 875 mousedev->handle.private = mousedev; 876 877 mousedev->dev.class = &input_class; 878 if (dev) 879 mousedev->dev.parent = &dev->dev; 880 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 881 mousedev->dev.release = mousedev_free; 882 device_initialize(&mousedev->dev); 883 884 if (minor != MOUSEDEV_MIX) { 885 error = input_register_handle(&mousedev->handle); 886 if (error) 887 goto err_free_mousedev; 888 } 889 890 error = mousedev_install_chrdev(mousedev); 891 if (error) 892 goto err_unregister_handle; 893 894 error = device_add(&mousedev->dev); 895 if (error) 896 goto err_cleanup_mousedev; 897 898 return mousedev; 899 900 err_cleanup_mousedev: 901 mousedev_cleanup(mousedev); 902 err_unregister_handle: 903 if (minor != MOUSEDEV_MIX) 904 input_unregister_handle(&mousedev->handle); 905 err_free_mousedev: 906 put_device(&mousedev->dev); 907 err_out: 908 return ERR_PTR(error); 909 } 910 911 static void mousedev_destroy(struct mousedev *mousedev) 912 { 913 device_del(&mousedev->dev); 914 mousedev_cleanup(mousedev); 915 if (mousedev->minor != MOUSEDEV_MIX) 916 input_unregister_handle(&mousedev->handle); 917 put_device(&mousedev->dev); 918 } 919 920 static int mixdev_add_device(struct mousedev *mousedev) 921 { 922 int retval; 923 924 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 925 if (retval) 926 return retval; 927 928 if (mousedev_mix->open) { 929 retval = mousedev_open_device(mousedev); 930 if (retval) 931 goto out; 932 933 mousedev->mixdev_open = 1; 934 } 935 936 get_device(&mousedev->dev); 937 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 938 939 out: 940 mutex_unlock(&mousedev_mix->mutex); 941 return retval; 942 } 943 944 static void mixdev_remove_device(struct mousedev *mousedev) 945 { 946 mutex_lock(&mousedev_mix->mutex); 947 948 if (mousedev->mixdev_open) { 949 mousedev->mixdev_open = 0; 950 mousedev_close_device(mousedev); 951 } 952 953 list_del_init(&mousedev->mixdev_node); 954 mutex_unlock(&mousedev_mix->mutex); 955 956 put_device(&mousedev->dev); 957 } 958 959 static int mousedev_connect(struct input_handler *handler, 960 struct input_dev *dev, 961 const struct input_device_id *id) 962 { 963 struct mousedev *mousedev; 964 int minor; 965 int error; 966 967 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 968 if (!mousedev_table[minor]) 969 break; 970 971 if (minor == MOUSEDEV_MINORS) { 972 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 973 return -ENFILE; 974 } 975 976 mousedev = mousedev_create(dev, handler, minor); 977 if (IS_ERR(mousedev)) 978 return PTR_ERR(mousedev); 979 980 error = mixdev_add_device(mousedev); 981 if (error) { 982 mousedev_destroy(mousedev); 983 return error; 984 } 985 986 return 0; 987 } 988 989 static void mousedev_disconnect(struct input_handle *handle) 990 { 991 struct mousedev *mousedev = handle->private; 992 993 mixdev_remove_device(mousedev); 994 mousedev_destroy(mousedev); 995 } 996 997 static const struct input_device_id mousedev_ids[] = { 998 { 999 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1000 INPUT_DEVICE_ID_MATCH_KEYBIT | 1001 INPUT_DEVICE_ID_MATCH_RELBIT, 1002 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1003 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1004 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1005 }, /* A mouse like device, at least one button, 1006 two relative axes */ 1007 { 1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1009 INPUT_DEVICE_ID_MATCH_RELBIT, 1010 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1011 .relbit = { BIT_MASK(REL_WHEEL) }, 1012 }, /* A separate scrollwheel */ 1013 { 1014 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1015 INPUT_DEVICE_ID_MATCH_KEYBIT | 1016 INPUT_DEVICE_ID_MATCH_ABSBIT, 1017 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1018 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1019 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1020 }, /* A tablet like device, at least touch detection, 1021 two absolute axes */ 1022 { 1023 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1024 INPUT_DEVICE_ID_MATCH_KEYBIT | 1025 INPUT_DEVICE_ID_MATCH_ABSBIT, 1026 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1027 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1028 BIT_MASK(BTN_TOOL_FINGER) }, 1029 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1030 BIT_MASK(ABS_PRESSURE) | 1031 BIT_MASK(ABS_TOOL_WIDTH) }, 1032 }, /* A touchpad */ 1033 { 1034 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1035 INPUT_DEVICE_ID_MATCH_KEYBIT | 1036 INPUT_DEVICE_ID_MATCH_ABSBIT, 1037 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1038 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1039 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1040 }, /* Mouse-like device with absolute X and Y but ordinary 1041 clicks, like hp ILO2 High Performance mouse */ 1042 1043 { }, /* Terminating entry */ 1044 }; 1045 1046 MODULE_DEVICE_TABLE(input, mousedev_ids); 1047 1048 static struct input_handler mousedev_handler = { 1049 .event = mousedev_event, 1050 .connect = mousedev_connect, 1051 .disconnect = mousedev_disconnect, 1052 .fops = &mousedev_fops, 1053 .minor = MOUSEDEV_MINOR_BASE, 1054 .name = "mousedev", 1055 .id_table = mousedev_ids, 1056 }; 1057 1058 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1059 static struct miscdevice psaux_mouse = { 1060 PSMOUSE_MINOR, "psaux", &mousedev_fops 1061 }; 1062 static int psaux_registered; 1063 #endif 1064 1065 static int __init mousedev_init(void) 1066 { 1067 int error; 1068 1069 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1070 if (IS_ERR(mousedev_mix)) 1071 return PTR_ERR(mousedev_mix); 1072 1073 error = input_register_handler(&mousedev_handler); 1074 if (error) { 1075 mousedev_destroy(mousedev_mix); 1076 return error; 1077 } 1078 1079 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1080 error = misc_register(&psaux_mouse); 1081 if (error) 1082 printk(KERN_WARNING "mice: could not register psaux device, " 1083 "error: %d\n", error); 1084 else 1085 psaux_registered = 1; 1086 #endif 1087 1088 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1089 1090 return 0; 1091 } 1092 1093 static void __exit mousedev_exit(void) 1094 { 1095 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1096 if (psaux_registered) 1097 misc_deregister(&psaux_mouse); 1098 #endif 1099 input_unregister_handler(&mousedev_handler); 1100 mousedev_destroy(mousedev_mix); 1101 } 1102 1103 module_init(mousedev_init); 1104 module_exit(mousedev_exit); 1105