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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #define MOUSEDEV_MINOR_BASE 32 15 #define MOUSEDEV_MINORS 32 16 #define MOUSEDEV_MIX 31 17 18 #include <linux/sched.h> 19 #include <linux/slab.h> 20 #include <linux/poll.h> 21 #include <linux/module.h> 22 #include <linux/init.h> 23 #include <linux/input.h> 24 #include <linux/random.h> 25 #include <linux/major.h> 26 #include <linux/device.h> 27 #include <linux/kernel.h> 28 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 29 #include <linux/miscdevice.h> 30 #endif 31 32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 33 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 34 MODULE_LICENSE("GPL"); 35 36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X 37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024 38 #endif 39 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y 40 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768 41 #endif 42 43 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 44 module_param(xres, uint, 0644); 45 MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 46 47 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 48 module_param(yres, uint, 0644); 49 MODULE_PARM_DESC(yres, "Vertical screen resolution"); 50 51 static unsigned tap_time = 200; 52 module_param(tap_time, uint, 0644); 53 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 54 55 struct mousedev_hw_data { 56 int dx, dy, dz; 57 int x, y; 58 int abs_event; 59 unsigned long buttons; 60 }; 61 62 struct mousedev { 63 int open; 64 int minor; 65 struct input_handle handle; 66 wait_queue_head_t wait; 67 struct list_head client_list; 68 spinlock_t client_lock; /* protects client_list */ 69 struct mutex mutex; 70 struct device dev; 71 bool exist; 72 73 struct list_head mixdev_node; 74 int mixdev_open; 75 76 struct mousedev_hw_data packet; 77 unsigned int pkt_count; 78 int old_x[4], old_y[4]; 79 int frac_dx, frac_dy; 80 unsigned long touch; 81 }; 82 83 enum mousedev_emul { 84 MOUSEDEV_EMUL_PS2, 85 MOUSEDEV_EMUL_IMPS, 86 MOUSEDEV_EMUL_EXPS 87 }; 88 89 struct mousedev_motion { 90 int dx, dy, dz; 91 unsigned long buttons; 92 }; 93 94 #define PACKET_QUEUE_LEN 16 95 struct mousedev_client { 96 struct fasync_struct *fasync; 97 struct mousedev *mousedev; 98 struct list_head node; 99 100 struct mousedev_motion packets[PACKET_QUEUE_LEN]; 101 unsigned int head, tail; 102 spinlock_t packet_lock; 103 int pos_x, pos_y; 104 105 signed char ps2[6]; 106 unsigned char ready, buffer, bufsiz; 107 unsigned char imexseq, impsseq; 108 enum mousedev_emul mode; 109 unsigned long last_buttons; 110 }; 111 112 #define MOUSEDEV_SEQ_LEN 6 113 114 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 115 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 116 117 static struct input_handler mousedev_handler; 118 119 static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; 120 static DEFINE_MUTEX(mousedev_table_mutex); 121 static struct mousedev *mousedev_mix; 122 static LIST_HEAD(mousedev_mix_list); 123 124 static void mixdev_open_devices(void); 125 static void mixdev_close_devices(void); 126 127 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03]) 128 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03]) 129 130 static void mousedev_touchpad_event(struct input_dev *dev, 131 struct mousedev *mousedev, 132 unsigned int code, int value) 133 { 134 int size, tmp; 135 enum { FRACTION_DENOM = 128 }; 136 137 switch (code) { 138 139 case ABS_X: 140 141 fx(0) = value; 142 if (mousedev->touch && mousedev->pkt_count >= 2) { 143 size = input_abs_get_max(dev, ABS_X) - 144 input_abs_get_min(dev, ABS_X); 145 if (size == 0) 146 size = 256 * 2; 147 148 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size; 149 tmp += mousedev->frac_dx; 150 mousedev->packet.dx = tmp / FRACTION_DENOM; 151 mousedev->frac_dx = 152 tmp - mousedev->packet.dx * FRACTION_DENOM; 153 } 154 break; 155 156 case ABS_Y: 157 fy(0) = value; 158 if (mousedev->touch && mousedev->pkt_count >= 2) { 159 /* use X size for ABS_Y to keep the same scale */ 160 size = input_abs_get_max(dev, ABS_X) - 161 input_abs_get_min(dev, ABS_X); 162 if (size == 0) 163 size = 256 * 2; 164 165 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size; 166 tmp += mousedev->frac_dy; 167 mousedev->packet.dy = tmp / FRACTION_DENOM; 168 mousedev->frac_dy = tmp - 169 mousedev->packet.dy * FRACTION_DENOM; 170 } 171 break; 172 } 173 } 174 175 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, 176 unsigned int code, int value) 177 { 178 int min, max, size; 179 180 switch (code) { 181 182 case ABS_X: 183 min = input_abs_get_min(dev, ABS_X); 184 max = input_abs_get_max(dev, ABS_X); 185 186 size = max - min; 187 if (size == 0) 188 size = xres ? : 1; 189 190 clamp(value, min, max); 191 192 mousedev->packet.x = ((value - min) * xres) / size; 193 mousedev->packet.abs_event = 1; 194 break; 195 196 case ABS_Y: 197 min = input_abs_get_min(dev, ABS_Y); 198 max = input_abs_get_max(dev, ABS_Y); 199 200 size = max - min; 201 if (size == 0) 202 size = yres ? : 1; 203 204 clamp(value, min, max); 205 206 mousedev->packet.y = yres - ((value - min) * yres) / size; 207 mousedev->packet.abs_event = 1; 208 break; 209 } 210 } 211 212 static void mousedev_rel_event(struct mousedev *mousedev, 213 unsigned int code, int value) 214 { 215 switch (code) { 216 case REL_X: 217 mousedev->packet.dx += value; 218 break; 219 220 case REL_Y: 221 mousedev->packet.dy -= value; 222 break; 223 224 case REL_WHEEL: 225 mousedev->packet.dz -= value; 226 break; 227 } 228 } 229 230 static void mousedev_key_event(struct mousedev *mousedev, 231 unsigned int code, int value) 232 { 233 int index; 234 235 switch (code) { 236 237 case BTN_TOUCH: 238 case BTN_0: 239 case BTN_LEFT: index = 0; break; 240 241 case BTN_STYLUS: 242 case BTN_1: 243 case BTN_RIGHT: index = 1; break; 244 245 case BTN_2: 246 case BTN_FORWARD: 247 case BTN_STYLUS2: 248 case BTN_MIDDLE: index = 2; break; 249 250 case BTN_3: 251 case BTN_BACK: 252 case BTN_SIDE: index = 3; break; 253 254 case BTN_4: 255 case BTN_EXTRA: index = 4; break; 256 257 default: return; 258 } 259 260 if (value) { 261 set_bit(index, &mousedev->packet.buttons); 262 set_bit(index, &mousedev_mix->packet.buttons); 263 } else { 264 clear_bit(index, &mousedev->packet.buttons); 265 clear_bit(index, &mousedev_mix->packet.buttons); 266 } 267 } 268 269 static void mousedev_notify_readers(struct mousedev *mousedev, 270 struct mousedev_hw_data *packet) 271 { 272 struct mousedev_client *client; 273 struct mousedev_motion *p; 274 unsigned int new_head; 275 int wake_readers = 0; 276 277 rcu_read_lock(); 278 list_for_each_entry_rcu(client, &mousedev->client_list, node) { 279 280 /* Just acquire the lock, interrupts already disabled */ 281 spin_lock(&client->packet_lock); 282 283 p = &client->packets[client->head]; 284 if (client->ready && p->buttons != mousedev->packet.buttons) { 285 new_head = (client->head + 1) % PACKET_QUEUE_LEN; 286 if (new_head != client->tail) { 287 p = &client->packets[client->head = new_head]; 288 memset(p, 0, sizeof(struct mousedev_motion)); 289 } 290 } 291 292 if (packet->abs_event) { 293 p->dx += packet->x - client->pos_x; 294 p->dy += packet->y - client->pos_y; 295 client->pos_x = packet->x; 296 client->pos_y = packet->y; 297 } 298 299 client->pos_x += packet->dx; 300 client->pos_x = client->pos_x < 0 ? 301 0 : (client->pos_x >= xres ? xres : client->pos_x); 302 client->pos_y += packet->dy; 303 client->pos_y = client->pos_y < 0 ? 304 0 : (client->pos_y >= yres ? yres : client->pos_y); 305 306 p->dx += packet->dx; 307 p->dy += packet->dy; 308 p->dz += packet->dz; 309 p->buttons = mousedev->packet.buttons; 310 311 if (p->dx || p->dy || p->dz || 312 p->buttons != client->last_buttons) 313 client->ready = 1; 314 315 spin_unlock(&client->packet_lock); 316 317 if (client->ready) { 318 kill_fasync(&client->fasync, SIGIO, POLL_IN); 319 wake_readers = 1; 320 } 321 } 322 rcu_read_unlock(); 323 324 if (wake_readers) 325 wake_up_interruptible(&mousedev->wait); 326 } 327 328 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value) 329 { 330 if (!value) { 331 if (mousedev->touch && 332 time_before(jiffies, 333 mousedev->touch + msecs_to_jiffies(tap_time))) { 334 /* 335 * Toggle left button to emulate tap. 336 * We rely on the fact that mousedev_mix always has 0 337 * motion packet so we won't mess current position. 338 */ 339 set_bit(0, &mousedev->packet.buttons); 340 set_bit(0, &mousedev_mix->packet.buttons); 341 mousedev_notify_readers(mousedev, &mousedev_mix->packet); 342 mousedev_notify_readers(mousedev_mix, 343 &mousedev_mix->packet); 344 clear_bit(0, &mousedev->packet.buttons); 345 clear_bit(0, &mousedev_mix->packet.buttons); 346 } 347 mousedev->touch = mousedev->pkt_count = 0; 348 mousedev->frac_dx = 0; 349 mousedev->frac_dy = 0; 350 351 } else if (!mousedev->touch) 352 mousedev->touch = jiffies; 353 } 354 355 static void mousedev_event(struct input_handle *handle, 356 unsigned int type, unsigned int code, int value) 357 { 358 struct mousedev *mousedev = handle->private; 359 360 switch (type) { 361 362 case EV_ABS: 363 /* Ignore joysticks */ 364 if (test_bit(BTN_TRIGGER, handle->dev->keybit)) 365 return; 366 367 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 368 mousedev_touchpad_event(handle->dev, 369 mousedev, code, value); 370 else 371 mousedev_abs_event(handle->dev, mousedev, code, value); 372 373 break; 374 375 case EV_REL: 376 mousedev_rel_event(mousedev, code, value); 377 break; 378 379 case EV_KEY: 380 if (value != 2) { 381 if (code == BTN_TOUCH && 382 test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) 383 mousedev_touchpad_touch(mousedev, value); 384 else 385 mousedev_key_event(mousedev, code, value); 386 } 387 break; 388 389 case EV_SYN: 390 if (code == SYN_REPORT) { 391 if (mousedev->touch) { 392 mousedev->pkt_count++; 393 /* 394 * Input system eats duplicate events, 395 * but we need all of them to do correct 396 * averaging so apply present one forward 397 */ 398 fx(0) = fx(1); 399 fy(0) = fy(1); 400 } 401 402 mousedev_notify_readers(mousedev, &mousedev->packet); 403 mousedev_notify_readers(mousedev_mix, &mousedev->packet); 404 405 mousedev->packet.dx = mousedev->packet.dy = 406 mousedev->packet.dz = 0; 407 mousedev->packet.abs_event = 0; 408 } 409 break; 410 } 411 } 412 413 static int mousedev_fasync(int fd, struct file *file, int on) 414 { 415 struct mousedev_client *client = file->private_data; 416 417 return fasync_helper(fd, file, on, &client->fasync); 418 } 419 420 static void mousedev_free(struct device *dev) 421 { 422 struct mousedev *mousedev = container_of(dev, struct mousedev, dev); 423 424 input_put_device(mousedev->handle.dev); 425 kfree(mousedev); 426 } 427 428 static int mousedev_open_device(struct mousedev *mousedev) 429 { 430 int retval; 431 432 retval = mutex_lock_interruptible(&mousedev->mutex); 433 if (retval) 434 return retval; 435 436 if (mousedev->minor == MOUSEDEV_MIX) 437 mixdev_open_devices(); 438 else if (!mousedev->exist) 439 retval = -ENODEV; 440 else if (!mousedev->open++) { 441 retval = input_open_device(&mousedev->handle); 442 if (retval) 443 mousedev->open--; 444 } 445 446 mutex_unlock(&mousedev->mutex); 447 return retval; 448 } 449 450 static void mousedev_close_device(struct mousedev *mousedev) 451 { 452 mutex_lock(&mousedev->mutex); 453 454 if (mousedev->minor == MOUSEDEV_MIX) 455 mixdev_close_devices(); 456 else if (mousedev->exist && !--mousedev->open) 457 input_close_device(&mousedev->handle); 458 459 mutex_unlock(&mousedev->mutex); 460 } 461 462 /* 463 * Open all available devices so they can all be multiplexed in one. 464 * stream. Note that this function is called with mousedev_mix->mutex 465 * held. 466 */ 467 static void mixdev_open_devices(void) 468 { 469 struct mousedev *mousedev; 470 471 if (mousedev_mix->open++) 472 return; 473 474 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 475 if (!mousedev->mixdev_open) { 476 if (mousedev_open_device(mousedev)) 477 continue; 478 479 mousedev->mixdev_open = 1; 480 } 481 } 482 } 483 484 /* 485 * Close all devices that were opened as part of multiplexed 486 * device. Note that this function is called with mousedev_mix->mutex 487 * held. 488 */ 489 static void mixdev_close_devices(void) 490 { 491 struct mousedev *mousedev; 492 493 if (--mousedev_mix->open) 494 return; 495 496 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) { 497 if (mousedev->mixdev_open) { 498 mousedev->mixdev_open = 0; 499 mousedev_close_device(mousedev); 500 } 501 } 502 } 503 504 505 static void mousedev_attach_client(struct mousedev *mousedev, 506 struct mousedev_client *client) 507 { 508 spin_lock(&mousedev->client_lock); 509 list_add_tail_rcu(&client->node, &mousedev->client_list); 510 spin_unlock(&mousedev->client_lock); 511 synchronize_rcu(); 512 } 513 514 static void mousedev_detach_client(struct mousedev *mousedev, 515 struct mousedev_client *client) 516 { 517 spin_lock(&mousedev->client_lock); 518 list_del_rcu(&client->node); 519 spin_unlock(&mousedev->client_lock); 520 synchronize_rcu(); 521 } 522 523 static int mousedev_release(struct inode *inode, struct file *file) 524 { 525 struct mousedev_client *client = file->private_data; 526 struct mousedev *mousedev = client->mousedev; 527 528 mousedev_detach_client(mousedev, client); 529 kfree(client); 530 531 mousedev_close_device(mousedev); 532 put_device(&mousedev->dev); 533 534 return 0; 535 } 536 537 static int mousedev_open(struct inode *inode, struct file *file) 538 { 539 struct mousedev_client *client; 540 struct mousedev *mousedev; 541 int error; 542 int i; 543 544 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 545 if (imajor(inode) == MISC_MAJOR) 546 i = MOUSEDEV_MIX; 547 else 548 #endif 549 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 550 551 if (i >= MOUSEDEV_MINORS) 552 return -ENODEV; 553 554 error = mutex_lock_interruptible(&mousedev_table_mutex); 555 if (error) { 556 return error; 557 } 558 mousedev = mousedev_table[i]; 559 if (mousedev) 560 get_device(&mousedev->dev); 561 mutex_unlock(&mousedev_table_mutex); 562 563 if (!mousedev) { 564 return -ENODEV; 565 } 566 567 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 568 if (!client) { 569 error = -ENOMEM; 570 goto err_put_mousedev; 571 } 572 573 spin_lock_init(&client->packet_lock); 574 client->pos_x = xres / 2; 575 client->pos_y = yres / 2; 576 client->mousedev = mousedev; 577 mousedev_attach_client(mousedev, client); 578 579 error = mousedev_open_device(mousedev); 580 if (error) 581 goto err_free_client; 582 583 file->private_data = client; 584 return 0; 585 586 err_free_client: 587 mousedev_detach_client(mousedev, client); 588 kfree(client); 589 err_put_mousedev: 590 put_device(&mousedev->dev); 591 return error; 592 } 593 594 static inline int mousedev_limit_delta(int delta, int limit) 595 { 596 return delta > limit ? limit : (delta < -limit ? -limit : delta); 597 } 598 599 static void mousedev_packet(struct mousedev_client *client, 600 signed char *ps2_data) 601 { 602 struct mousedev_motion *p = &client->packets[client->tail]; 603 604 ps2_data[0] = 0x08 | 605 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 606 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 607 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 608 p->dx -= ps2_data[1]; 609 p->dy -= ps2_data[2]; 610 611 switch (client->mode) { 612 case MOUSEDEV_EMUL_EXPS: 613 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 614 p->dz -= ps2_data[3]; 615 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 616 client->bufsiz = 4; 617 break; 618 619 case MOUSEDEV_EMUL_IMPS: 620 ps2_data[0] |= 621 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 622 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 623 p->dz -= ps2_data[3]; 624 client->bufsiz = 4; 625 break; 626 627 case MOUSEDEV_EMUL_PS2: 628 default: 629 ps2_data[0] |= 630 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 631 p->dz = 0; 632 client->bufsiz = 3; 633 break; 634 } 635 636 if (!p->dx && !p->dy && !p->dz) { 637 if (client->tail == client->head) { 638 client->ready = 0; 639 client->last_buttons = p->buttons; 640 } else 641 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 642 } 643 } 644 645 static void mousedev_generate_response(struct mousedev_client *client, 646 int command) 647 { 648 client->ps2[0] = 0xfa; /* ACK */ 649 650 switch (command) { 651 652 case 0xeb: /* Poll */ 653 mousedev_packet(client, &client->ps2[1]); 654 client->bufsiz++; /* account for leading ACK */ 655 break; 656 657 case 0xf2: /* Get ID */ 658 switch (client->mode) { 659 case MOUSEDEV_EMUL_PS2: 660 client->ps2[1] = 0; 661 break; 662 case MOUSEDEV_EMUL_IMPS: 663 client->ps2[1] = 3; 664 break; 665 case MOUSEDEV_EMUL_EXPS: 666 client->ps2[1] = 4; 667 break; 668 } 669 client->bufsiz = 2; 670 break; 671 672 case 0xe9: /* Get info */ 673 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 674 client->bufsiz = 4; 675 break; 676 677 case 0xff: /* Reset */ 678 client->impsseq = client->imexseq = 0; 679 client->mode = MOUSEDEV_EMUL_PS2; 680 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 681 client->bufsiz = 3; 682 break; 683 684 default: 685 client->bufsiz = 1; 686 break; 687 } 688 client->buffer = client->bufsiz; 689 } 690 691 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 692 size_t count, loff_t *ppos) 693 { 694 struct mousedev_client *client = file->private_data; 695 unsigned char c; 696 unsigned int i; 697 698 for (i = 0; i < count; i++) { 699 700 if (get_user(c, buffer + i)) 701 return -EFAULT; 702 703 spin_lock_irq(&client->packet_lock); 704 705 if (c == mousedev_imex_seq[client->imexseq]) { 706 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 707 client->imexseq = 0; 708 client->mode = MOUSEDEV_EMUL_EXPS; 709 } 710 } else 711 client->imexseq = 0; 712 713 if (c == mousedev_imps_seq[client->impsseq]) { 714 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 715 client->impsseq = 0; 716 client->mode = MOUSEDEV_EMUL_IMPS; 717 } 718 } else 719 client->impsseq = 0; 720 721 mousedev_generate_response(client, c); 722 723 spin_unlock_irq(&client->packet_lock); 724 } 725 726 kill_fasync(&client->fasync, SIGIO, POLL_IN); 727 wake_up_interruptible(&client->mousedev->wait); 728 729 return count; 730 } 731 732 static ssize_t mousedev_read(struct file *file, char __user *buffer, 733 size_t count, loff_t *ppos) 734 { 735 struct mousedev_client *client = file->private_data; 736 struct mousedev *mousedev = client->mousedev; 737 signed char data[sizeof(client->ps2)]; 738 int retval = 0; 739 740 if (!client->ready && !client->buffer && mousedev->exist && 741 (file->f_flags & O_NONBLOCK)) 742 return -EAGAIN; 743 744 retval = wait_event_interruptible(mousedev->wait, 745 !mousedev->exist || client->ready || client->buffer); 746 if (retval) 747 return retval; 748 749 if (!mousedev->exist) 750 return -ENODEV; 751 752 spin_lock_irq(&client->packet_lock); 753 754 if (!client->buffer && client->ready) { 755 mousedev_packet(client, client->ps2); 756 client->buffer = client->bufsiz; 757 } 758 759 if (count > client->buffer) 760 count = client->buffer; 761 762 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 763 client->buffer -= count; 764 765 spin_unlock_irq(&client->packet_lock); 766 767 if (copy_to_user(buffer, data, count)) 768 return -EFAULT; 769 770 return count; 771 } 772 773 /* No kernel lock - fine */ 774 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 775 { 776 struct mousedev_client *client = file->private_data; 777 struct mousedev *mousedev = client->mousedev; 778 unsigned int mask; 779 780 poll_wait(file, &mousedev->wait, wait); 781 782 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 783 if (client->ready || client->buffer) 784 mask |= POLLIN | POLLRDNORM; 785 786 return mask; 787 } 788 789 static const struct file_operations mousedev_fops = { 790 .owner = THIS_MODULE, 791 .read = mousedev_read, 792 .write = mousedev_write, 793 .poll = mousedev_poll, 794 .open = mousedev_open, 795 .release = mousedev_release, 796 .fasync = mousedev_fasync, 797 .llseek = noop_llseek, 798 }; 799 800 static int mousedev_install_chrdev(struct mousedev *mousedev) 801 { 802 mousedev_table[mousedev->minor] = mousedev; 803 return 0; 804 } 805 806 static void mousedev_remove_chrdev(struct mousedev *mousedev) 807 { 808 mutex_lock(&mousedev_table_mutex); 809 mousedev_table[mousedev->minor] = NULL; 810 mutex_unlock(&mousedev_table_mutex); 811 } 812 813 /* 814 * Mark device non-existent. This disables writes, ioctls and 815 * prevents new users from opening the device. Already posted 816 * blocking reads will stay, however new ones will fail. 817 */ 818 static void mousedev_mark_dead(struct mousedev *mousedev) 819 { 820 mutex_lock(&mousedev->mutex); 821 mousedev->exist = false; 822 mutex_unlock(&mousedev->mutex); 823 } 824 825 /* 826 * Wake up users waiting for IO so they can disconnect from 827 * dead device. 828 */ 829 static void mousedev_hangup(struct mousedev *mousedev) 830 { 831 struct mousedev_client *client; 832 833 spin_lock(&mousedev->client_lock); 834 list_for_each_entry(client, &mousedev->client_list, node) 835 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 836 spin_unlock(&mousedev->client_lock); 837 838 wake_up_interruptible(&mousedev->wait); 839 } 840 841 static void mousedev_cleanup(struct mousedev *mousedev) 842 { 843 struct input_handle *handle = &mousedev->handle; 844 845 mousedev_mark_dead(mousedev); 846 mousedev_hangup(mousedev); 847 mousedev_remove_chrdev(mousedev); 848 849 /* mousedev is marked dead so no one else accesses mousedev->open */ 850 if (mousedev->open) 851 input_close_device(handle); 852 } 853 854 static struct mousedev *mousedev_create(struct input_dev *dev, 855 struct input_handler *handler, 856 int minor) 857 { 858 struct mousedev *mousedev; 859 int error; 860 861 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 862 if (!mousedev) { 863 error = -ENOMEM; 864 goto err_out; 865 } 866 867 INIT_LIST_HEAD(&mousedev->client_list); 868 INIT_LIST_HEAD(&mousedev->mixdev_node); 869 spin_lock_init(&mousedev->client_lock); 870 mutex_init(&mousedev->mutex); 871 lockdep_set_subclass(&mousedev->mutex, 872 minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0); 873 init_waitqueue_head(&mousedev->wait); 874 875 if (minor == MOUSEDEV_MIX) 876 dev_set_name(&mousedev->dev, "mice"); 877 else 878 dev_set_name(&mousedev->dev, "mouse%d", minor); 879 880 mousedev->minor = minor; 881 mousedev->exist = true; 882 mousedev->handle.dev = input_get_device(dev); 883 mousedev->handle.name = dev_name(&mousedev->dev); 884 mousedev->handle.handler = handler; 885 mousedev->handle.private = mousedev; 886 887 mousedev->dev.class = &input_class; 888 if (dev) 889 mousedev->dev.parent = &dev->dev; 890 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 891 mousedev->dev.release = mousedev_free; 892 device_initialize(&mousedev->dev); 893 894 if (minor != MOUSEDEV_MIX) { 895 error = input_register_handle(&mousedev->handle); 896 if (error) 897 goto err_free_mousedev; 898 } 899 900 error = mousedev_install_chrdev(mousedev); 901 if (error) 902 goto err_unregister_handle; 903 904 error = device_add(&mousedev->dev); 905 if (error) 906 goto err_cleanup_mousedev; 907 908 return mousedev; 909 910 err_cleanup_mousedev: 911 mousedev_cleanup(mousedev); 912 err_unregister_handle: 913 if (minor != MOUSEDEV_MIX) 914 input_unregister_handle(&mousedev->handle); 915 err_free_mousedev: 916 put_device(&mousedev->dev); 917 err_out: 918 return ERR_PTR(error); 919 } 920 921 static void mousedev_destroy(struct mousedev *mousedev) 922 { 923 device_del(&mousedev->dev); 924 mousedev_cleanup(mousedev); 925 if (mousedev->minor != MOUSEDEV_MIX) 926 input_unregister_handle(&mousedev->handle); 927 put_device(&mousedev->dev); 928 } 929 930 static int mixdev_add_device(struct mousedev *mousedev) 931 { 932 int retval; 933 934 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 935 if (retval) 936 return retval; 937 938 if (mousedev_mix->open) { 939 retval = mousedev_open_device(mousedev); 940 if (retval) 941 goto out; 942 943 mousedev->mixdev_open = 1; 944 } 945 946 get_device(&mousedev->dev); 947 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 948 949 out: 950 mutex_unlock(&mousedev_mix->mutex); 951 return retval; 952 } 953 954 static void mixdev_remove_device(struct mousedev *mousedev) 955 { 956 mutex_lock(&mousedev_mix->mutex); 957 958 if (mousedev->mixdev_open) { 959 mousedev->mixdev_open = 0; 960 mousedev_close_device(mousedev); 961 } 962 963 list_del_init(&mousedev->mixdev_node); 964 mutex_unlock(&mousedev_mix->mutex); 965 966 put_device(&mousedev->dev); 967 } 968 969 static int mousedev_connect(struct input_handler *handler, 970 struct input_dev *dev, 971 const struct input_device_id *id) 972 { 973 struct mousedev *mousedev; 974 int minor; 975 int error; 976 977 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 978 if (!mousedev_table[minor]) 979 break; 980 981 if (minor == MOUSEDEV_MINORS) { 982 pr_err("no more free mousedev devices\n"); 983 return -ENFILE; 984 } 985 986 mousedev = mousedev_create(dev, handler, minor); 987 if (IS_ERR(mousedev)) 988 return PTR_ERR(mousedev); 989 990 error = mixdev_add_device(mousedev); 991 if (error) { 992 mousedev_destroy(mousedev); 993 return error; 994 } 995 996 return 0; 997 } 998 999 static void mousedev_disconnect(struct input_handle *handle) 1000 { 1001 struct mousedev *mousedev = handle->private; 1002 1003 mixdev_remove_device(mousedev); 1004 mousedev_destroy(mousedev); 1005 } 1006 1007 static const struct input_device_id mousedev_ids[] = { 1008 { 1009 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1010 INPUT_DEVICE_ID_MATCH_KEYBIT | 1011 INPUT_DEVICE_ID_MATCH_RELBIT, 1012 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1013 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1014 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1015 }, /* A mouse like device, at least one button, 1016 two relative axes */ 1017 { 1018 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1019 INPUT_DEVICE_ID_MATCH_RELBIT, 1020 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1021 .relbit = { BIT_MASK(REL_WHEEL) }, 1022 }, /* A separate scrollwheel */ 1023 { 1024 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1025 INPUT_DEVICE_ID_MATCH_KEYBIT | 1026 INPUT_DEVICE_ID_MATCH_ABSBIT, 1027 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1028 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1029 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1030 }, /* A tablet like device, at least touch detection, 1031 two absolute axes */ 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_TOOL_FINGER)] = 1038 BIT_MASK(BTN_TOOL_FINGER) }, 1039 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1040 BIT_MASK(ABS_PRESSURE) | 1041 BIT_MASK(ABS_TOOL_WIDTH) }, 1042 }, /* A touchpad */ 1043 { 1044 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1045 INPUT_DEVICE_ID_MATCH_KEYBIT | 1046 INPUT_DEVICE_ID_MATCH_ABSBIT, 1047 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1048 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1049 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1050 }, /* Mouse-like device with absolute X and Y but ordinary 1051 clicks, like hp ILO2 High Performance mouse */ 1052 1053 { }, /* Terminating entry */ 1054 }; 1055 1056 MODULE_DEVICE_TABLE(input, mousedev_ids); 1057 1058 static struct input_handler mousedev_handler = { 1059 .event = mousedev_event, 1060 .connect = mousedev_connect, 1061 .disconnect = mousedev_disconnect, 1062 .fops = &mousedev_fops, 1063 .minor = MOUSEDEV_MINOR_BASE, 1064 .name = "mousedev", 1065 .id_table = mousedev_ids, 1066 }; 1067 1068 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1069 static struct miscdevice psaux_mouse = { 1070 PSMOUSE_MINOR, "psaux", &mousedev_fops 1071 }; 1072 static int psaux_registered; 1073 #endif 1074 1075 static int __init mousedev_init(void) 1076 { 1077 int error; 1078 1079 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1080 if (IS_ERR(mousedev_mix)) 1081 return PTR_ERR(mousedev_mix); 1082 1083 error = input_register_handler(&mousedev_handler); 1084 if (error) { 1085 mousedev_destroy(mousedev_mix); 1086 return error; 1087 } 1088 1089 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1090 error = misc_register(&psaux_mouse); 1091 if (error) 1092 pr_warning("could not register psaux device, error: %d\n", 1093 error); 1094 else 1095 psaux_registered = 1; 1096 #endif 1097 1098 pr_info("PS/2 mouse device common for all mice\n"); 1099 1100 return 0; 1101 } 1102 1103 static void __exit mousedev_exit(void) 1104 { 1105 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1106 if (psaux_registered) 1107 misc_deregister(&psaux_mouse); 1108 #endif 1109 input_unregister_handler(&mousedev_handler); 1110 mousedev_destroy(mousedev_mix); 1111 } 1112 1113 module_init(mousedev_init); 1114 module_exit(mousedev_exit); 1115