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/smp_lock.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 char name[16]; 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 int retval; 407 struct mousedev_client *client = file->private_data; 408 409 retval = fasync_helper(fd, file, on, &client->fasync); 410 411 return retval < 0 ? retval : 0; 412 } 413 414 static void mousedev_free(struct device *dev) 415 { 416 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 417 418 input_put_device(mousedev->handle.dev); 419 kfree(mousedev); 420 } 421 422 static int mousedev_open_device(struct mousedev *mousedev) 423 { 424 int retval; 425 426 retval = mutex_lock_interruptible(&mousedev->mutex); 427 if (retval) 428 return retval; 429 430 if (mousedev->minor == MOUSEDEV_MIX) 431 mixdev_open_devices(); 432 else if (!mousedev->exist) 433 retval = -ENODEV; 434 else if (!mousedev->open++) { 435 retval = input_open_device(&mousedev->handle); 436 if (retval) 437 mousedev->open--; 438 } 439 440 mutex_unlock(&mousedev->mutex); 441 return retval; 442 } 443 444 static void mousedev_close_device(struct mousedev *mousedev) 445 { 446 mutex_lock(&mousedev->mutex); 447 448 if (mousedev->minor == MOUSEDEV_MIX) 449 mixdev_close_devices(); 450 else if (mousedev->exist && !--mousedev->open) 451 input_close_device(&mousedev->handle); 452 453 mutex_unlock(&mousedev->mutex); 454 } 455 456 /* 457 * Open all available devices so they can all be multiplexed in one. 458 * stream. Note that this function is called with mousedev_mix->mutex 459 * held. 460 */ 461 static void mixdev_open_devices(void) 462 { 463 struct mousedev *mousedev; 464 465 if (mousedev_mix->open++) 466 return; 467 468 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 469 if (!mousedev->mixdev_open) { 470 if (mousedev_open_device(mousedev)) 471 continue; 472 473 mousedev->mixdev_open = 1; 474 } 475 } 476 } 477 478 /* 479 * Close all devices that were opened as part of multiplexed 480 * device. Note that this function is called with mousedev_mix->mutex 481 * held. 482 */ 483 static void mixdev_close_devices(void) 484 { 485 struct mousedev *mousedev; 486 487 if (--mousedev_mix->open) 488 return; 489 490 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 491 if (mousedev->mixdev_open) { 492 mousedev->mixdev_open = 0; 493 mousedev_close_device(mousedev); 494 } 495 } 496 } 497 498 499 static void mousedev_attach_client(struct mousedev *mousedev, 500 struct mousedev_client *client) 501 { 502 spin_lock(&mousedev->client_lock); 503 list_add_tail_rcu(&client->node, &mousedev->client_list); 504 spin_unlock(&mousedev->client_lock); 505 synchronize_rcu(); 506 } 507 508 static void mousedev_detach_client(struct mousedev *mousedev, 509 struct mousedev_client *client) 510 { 511 spin_lock(&mousedev->client_lock); 512 list_del_rcu(&client->node); 513 spin_unlock(&mousedev->client_lock); 514 synchronize_rcu(); 515 } 516 517 static int mousedev_release(struct inode *inode, struct file *file) 518 { 519 struct mousedev_client *client = file->private_data; 520 struct mousedev *mousedev = client->mousedev; 521 522 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 lock_kernel(); 549 error = mutex_lock_interruptible(&mousedev_table_mutex); 550 if (error) { 551 unlock_kernel(); 552 return error; 553 } 554 mousedev = mousedev_table[i]; 555 if (mousedev) 556 get_device(&mousedev->dev); 557 mutex_unlock(&mousedev_table_mutex); 558 559 if (!mousedev) { 560 unlock_kernel(); 561 return -ENODEV; 562 } 563 564 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 565 if (!client) { 566 error = -ENOMEM; 567 goto err_put_mousedev; 568 } 569 570 spin_lock_init(&client->packet_lock); 571 client->pos_x = xres / 2; 572 client->pos_y = yres / 2; 573 client->mousedev = mousedev; 574 mousedev_attach_client(mousedev, client); 575 576 error = mousedev_open_device(mousedev); 577 if (error) 578 goto err_free_client; 579 580 file->private_data = client; 581 unlock_kernel(); 582 return 0; 583 584 err_free_client: 585 mousedev_detach_client(mousedev, client); 586 kfree(client); 587 err_put_mousedev: 588 put_device(&mousedev->dev); 589 unlock_kernel(); 590 return error; 591 } 592 593 static inline int mousedev_limit_delta(int delta, int limit) 594 { 595 return delta > limit ? limit : (delta < -limit ? -limit : delta); 596 } 597 598 static void mousedev_packet(struct mousedev_client *client, 599 signed char *ps2_data) 600 { 601 struct mousedev_motion *p = &client->packets[client->tail]; 602 603 ps2_data[0] = 0x08 | 604 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 605 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 606 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 607 p->dx -= ps2_data[1]; 608 p->dy -= ps2_data[2]; 609 610 switch (client->mode) { 611 case MOUSEDEV_EMUL_EXPS: 612 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 613 p->dz -= ps2_data[3]; 614 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 615 client->bufsiz = 4; 616 break; 617 618 case MOUSEDEV_EMUL_IMPS: 619 ps2_data[0] |= 620 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 621 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 622 p->dz -= ps2_data[3]; 623 client->bufsiz = 4; 624 break; 625 626 case MOUSEDEV_EMUL_PS2: 627 default: 628 ps2_data[0] |= 629 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 630 p->dz = 0; 631 client->bufsiz = 3; 632 break; 633 } 634 635 if (!p->dx && !p->dy && !p->dz) { 636 if (client->tail == client->head) { 637 client->ready = 0; 638 client->last_buttons = p->buttons; 639 } else 640 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 641 } 642 } 643 644 static void mousedev_generate_response(struct mousedev_client *client, 645 int command) 646 { 647 client->ps2[0] = 0xfa; /* ACK */ 648 649 switch (command) { 650 651 case 0xeb: /* Poll */ 652 mousedev_packet(client, &client->ps2[1]); 653 client->bufsiz++; /* account for leading ACK */ 654 break; 655 656 case 0xf2: /* Get ID */ 657 switch (client->mode) { 658 case MOUSEDEV_EMUL_PS2: 659 client->ps2[1] = 0; 660 break; 661 case MOUSEDEV_EMUL_IMPS: 662 client->ps2[1] = 3; 663 break; 664 case MOUSEDEV_EMUL_EXPS: 665 client->ps2[1] = 4; 666 break; 667 } 668 client->bufsiz = 2; 669 break; 670 671 case 0xe9: /* Get info */ 672 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 673 client->bufsiz = 4; 674 break; 675 676 case 0xff: /* Reset */ 677 client->impsseq = client->imexseq = 0; 678 client->mode = MOUSEDEV_EMUL_PS2; 679 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 680 client->bufsiz = 3; 681 break; 682 683 default: 684 client->bufsiz = 1; 685 break; 686 } 687 client->buffer = client->bufsiz; 688 } 689 690 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 691 size_t count, loff_t *ppos) 692 { 693 struct mousedev_client *client = file->private_data; 694 unsigned char c; 695 unsigned int i; 696 697 for (i = 0; i < count; i++) { 698 699 if (get_user(c, buffer + i)) 700 return -EFAULT; 701 702 spin_lock_irq(&client->packet_lock); 703 704 if (c == mousedev_imex_seq[client->imexseq]) { 705 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 706 client->imexseq = 0; 707 client->mode = MOUSEDEV_EMUL_EXPS; 708 } 709 } else 710 client->imexseq = 0; 711 712 if (c == mousedev_imps_seq[client->impsseq]) { 713 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 714 client->impsseq = 0; 715 client->mode = MOUSEDEV_EMUL_IMPS; 716 } 717 } else 718 client->impsseq = 0; 719 720 mousedev_generate_response(client, c); 721 722 spin_unlock_irq(&client->packet_lock); 723 } 724 725 kill_fasync(&client->fasync, SIGIO, POLL_IN); 726 wake_up_interruptible(&client->mousedev->wait); 727 728 return count; 729 } 730 731 static ssize_t mousedev_read(struct file *file, char __user *buffer, 732 size_t count, loff_t *ppos) 733 { 734 struct mousedev_client *client = file->private_data; 735 struct mousedev *mousedev = client->mousedev; 736 signed char data[sizeof(client->ps2)]; 737 int retval = 0; 738 739 if (!client->ready && !client->buffer && mousedev->exist && 740 (file->f_flags & O_NONBLOCK)) 741 return -EAGAIN; 742 743 retval = wait_event_interruptible(mousedev->wait, 744 !mousedev->exist || client->ready || client->buffer); 745 if (retval) 746 return retval; 747 748 if (!mousedev->exist) 749 return -ENODEV; 750 751 spin_lock_irq(&client->packet_lock); 752 753 if (!client->buffer && client->ready) { 754 mousedev_packet(client, client->ps2); 755 client->buffer = client->bufsiz; 756 } 757 758 if (count > client->buffer) 759 count = client->buffer; 760 761 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 762 client->buffer -= count; 763 764 spin_unlock_irq(&client->packet_lock); 765 766 if (copy_to_user(buffer, data, count)) 767 return -EFAULT; 768 769 return count; 770 } 771 772 /* No kernel lock - fine */ 773 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 774 { 775 struct mousedev_client *client = file->private_data; 776 struct mousedev *mousedev = client->mousedev; 777 778 poll_wait(file, &mousedev->wait, wait); 779 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) | 780 (mousedev->exist ? 0 : (POLLHUP | POLLERR)); 781 } 782 783 static const struct file_operations mousedev_fops = { 784 .owner = THIS_MODULE, 785 .read = mousedev_read, 786 .write = mousedev_write, 787 .poll = mousedev_poll, 788 .open = mousedev_open, 789 .release = mousedev_release, 790 .fasync = mousedev_fasync, 791 }; 792 793 static int mousedev_install_chrdev(struct mousedev *mousedev) 794 { 795 mousedev_table[mousedev->minor] = mousedev; 796 return 0; 797 } 798 799 static void mousedev_remove_chrdev(struct mousedev *mousedev) 800 { 801 mutex_lock(&mousedev_table_mutex); 802 mousedev_table[mousedev->minor] = NULL; 803 mutex_unlock(&mousedev_table_mutex); 804 } 805 806 /* 807 * Mark device non-existent. This disables writes, ioctls and 808 * prevents new users from opening the device. Already posted 809 * blocking reads will stay, however new ones will fail. 810 */ 811 static void mousedev_mark_dead(struct mousedev *mousedev) 812 { 813 mutex_lock(&mousedev->mutex); 814 mousedev->exist = 0; 815 mutex_unlock(&mousedev->mutex); 816 } 817 818 /* 819 * Wake up users waiting for IO so they can disconnect from 820 * dead device. 821 */ 822 static void mousedev_hangup(struct mousedev *mousedev) 823 { 824 struct mousedev_client *client; 825 826 spin_lock(&mousedev->client_lock); 827 list_for_each_entry(client, &mousedev->client_list, node) 828 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 829 spin_unlock(&mousedev->client_lock); 830 831 wake_up_interruptible(&mousedev->wait); 832 } 833 834 static void mousedev_cleanup(struct mousedev *mousedev) 835 { 836 struct input_handle *handle = &mousedev->handle; 837 838 mousedev_mark_dead(mousedev); 839 mousedev_hangup(mousedev); 840 mousedev_remove_chrdev(mousedev); 841 842 /* mousedev is marked dead so no one else accesses mousedev->open */ 843 if (mousedev->open) 844 input_close_device(handle); 845 } 846 847 static struct mousedev *mousedev_create(struct input_dev *dev, 848 struct input_handler *handler, 849 int minor) 850 { 851 struct mousedev *mousedev; 852 int error; 853 854 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 855 if (!mousedev) { 856 error = -ENOMEM; 857 goto err_out; 858 } 859 860 INIT_LIST_HEAD(&mousedev->client_list); 861 INIT_LIST_HEAD(&mousedev->mixdev_node); 862 spin_lock_init(&mousedev->client_lock); 863 mutex_init(&mousedev->mutex); 864 lockdep_set_subclass(&mousedev->mutex, 865 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 866 init_waitqueue_head(&mousedev->wait); 867 868 if (minor == MOUSEDEV_MIX) 869 strlcpy(mousedev->name, "mice", sizeof(mousedev->name)); 870 else 871 snprintf(mousedev->name, sizeof(mousedev->name), 872 "mouse%d", minor); 873 874 mousedev->minor = minor; 875 mousedev->exist = 1; 876 mousedev->handle.dev = input_get_device(dev); 877 mousedev->handle.name = mousedev->name; 878 mousedev->handle.handler = handler; 879 mousedev->handle.private = mousedev; 880 881 strlcpy(mousedev->dev.bus_id, mousedev->name, 882 sizeof(mousedev->dev.bus_id)); 883 mousedev->dev.class = &input_class; 884 if (dev) 885 mousedev->dev.parent = &dev->dev; 886 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 887 mousedev->dev.release = mousedev_free; 888 device_initialize(&mousedev->dev); 889 890 if (minor != MOUSEDEV_MIX) { 891 error = input_register_handle(&mousedev->handle); 892 if (error) 893 goto err_free_mousedev; 894 } 895 896 error = mousedev_install_chrdev(mousedev); 897 if (error) 898 goto err_unregister_handle; 899 900 error = device_add(&mousedev->dev); 901 if (error) 902 goto err_cleanup_mousedev; 903 904 return mousedev; 905 906 err_cleanup_mousedev: 907 mousedev_cleanup(mousedev); 908 err_unregister_handle: 909 if (minor != MOUSEDEV_MIX) 910 input_unregister_handle(&mousedev->handle); 911 err_free_mousedev: 912 put_device(&mousedev->dev); 913 err_out: 914 return ERR_PTR(error); 915 } 916 917 static void mousedev_destroy(struct mousedev *mousedev) 918 { 919 device_del(&mousedev->dev); 920 mousedev_cleanup(mousedev); 921 if (mousedev->minor != MOUSEDEV_MIX) 922 input_unregister_handle(&mousedev->handle); 923 put_device(&mousedev->dev); 924 } 925 926 static int mixdev_add_device(struct mousedev *mousedev) 927 { 928 int retval; 929 930 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 931 if (retval) 932 return retval; 933 934 if (mousedev_mix->open) { 935 retval = mousedev_open_device(mousedev); 936 if (retval) 937 goto out; 938 939 mousedev->mixdev_open = 1; 940 } 941 942 get_device(&mousedev->dev); 943 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 944 945 out: 946 mutex_unlock(&mousedev_mix->mutex); 947 return retval; 948 } 949 950 static void mixdev_remove_device(struct mousedev *mousedev) 951 { 952 mutex_lock(&mousedev_mix->mutex); 953 954 if (mousedev->mixdev_open) { 955 mousedev->mixdev_open = 0; 956 mousedev_close_device(mousedev); 957 } 958 959 list_del_init(&mousedev->mixdev_node); 960 mutex_unlock(&mousedev_mix->mutex); 961 962 put_device(&mousedev->dev); 963 } 964 965 static int mousedev_connect(struct input_handler *handler, 966 struct input_dev *dev, 967 const struct input_device_id *id) 968 { 969 struct mousedev *mousedev; 970 int minor; 971 int error; 972 973 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 974 if (!mousedev_table[minor]) 975 break; 976 977 if (minor == MOUSEDEV_MINORS) { 978 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 979 return -ENFILE; 980 } 981 982 mousedev = mousedev_create(dev, handler, minor); 983 if (IS_ERR(mousedev)) 984 return PTR_ERR(mousedev); 985 986 error = mixdev_add_device(mousedev); 987 if (error) { 988 mousedev_destroy(mousedev); 989 return error; 990 } 991 992 return 0; 993 } 994 995 static void mousedev_disconnect(struct input_handle *handle) 996 { 997 struct mousedev *mousedev = handle->private; 998 999 mixdev_remove_device(mousedev); 1000 mousedev_destroy(mousedev); 1001 } 1002 1003 static const struct input_device_id mousedev_ids[] = { 1004 { 1005 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1006 INPUT_DEVICE_ID_MATCH_KEYBIT | 1007 INPUT_DEVICE_ID_MATCH_RELBIT, 1008 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1009 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1010 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1011 }, /* A mouse like device, at least one button, 1012 two relative axes */ 1013 { 1014 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1015 INPUT_DEVICE_ID_MATCH_RELBIT, 1016 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1017 .relbit = { BIT_MASK(REL_WHEEL) }, 1018 }, /* A separate scrollwheel */ 1019 { 1020 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1021 INPUT_DEVICE_ID_MATCH_KEYBIT | 1022 INPUT_DEVICE_ID_MATCH_ABSBIT, 1023 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1024 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1025 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1026 }, /* A tablet like device, at least touch detection, 1027 two absolute axes */ 1028 { 1029 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1030 INPUT_DEVICE_ID_MATCH_KEYBIT | 1031 INPUT_DEVICE_ID_MATCH_ABSBIT, 1032 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1033 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1034 BIT_MASK(BTN_TOOL_FINGER) }, 1035 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1036 BIT_MASK(ABS_PRESSURE) | 1037 BIT_MASK(ABS_TOOL_WIDTH) }, 1038 }, /* A touchpad */ 1039 { 1040 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1041 INPUT_DEVICE_ID_MATCH_KEYBIT | 1042 INPUT_DEVICE_ID_MATCH_ABSBIT, 1043 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1044 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1045 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1046 }, /* Mouse-like device with absolute X and Y but ordinary 1047 clicks, like hp ILO2 High Performance mouse */ 1048 1049 { }, /* Terminating entry */ 1050 }; 1051 1052 MODULE_DEVICE_TABLE(input, mousedev_ids); 1053 1054 static struct input_handler mousedev_handler = { 1055 .event = mousedev_event, 1056 .connect = mousedev_connect, 1057 .disconnect = mousedev_disconnect, 1058 .fops = &mousedev_fops, 1059 .minor = MOUSEDEV_MINOR_BASE, 1060 .name = "mousedev", 1061 .id_table = mousedev_ids, 1062 }; 1063 1064 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1065 static struct miscdevice psaux_mouse = { 1066 PSMOUSE_MINOR, "psaux", &mousedev_fops 1067 }; 1068 static int psaux_registered; 1069 #endif 1070 1071 static int __init mousedev_init(void) 1072 { 1073 int error; 1074 1075 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1076 if (IS_ERR(mousedev_mix)) 1077 return PTR_ERR(mousedev_mix); 1078 1079 error = input_register_handler(&mousedev_handler); 1080 if (error) { 1081 mousedev_destroy(mousedev_mix); 1082 return error; 1083 } 1084 1085 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1086 error = misc_register(&psaux_mouse); 1087 if (error) 1088 printk(KERN_WARNING "mice: could not register psaux device, " 1089 "error: %d\n", error); 1090 else 1091 psaux_registered = 1; 1092 #endif 1093 1094 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1095 1096 return 0; 1097 } 1098 1099 static void __exit mousedev_exit(void) 1100 { 1101 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1102 if (psaux_registered) 1103 misc_deregister(&psaux_mouse); 1104 #endif 1105 input_unregister_handler(&mousedev_handler); 1106 mousedev_destroy(mousedev_mix); 1107 } 1108 1109 module_init(mousedev_init); 1110 module_exit(mousedev_exit); 1111