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 value = 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 value = 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 } 512 513 static void mousedev_detach_client(struct mousedev *mousedev, 514 struct mousedev_client *client) 515 { 516 spin_lock(&mousedev->client_lock); 517 list_del_rcu(&client->node); 518 spin_unlock(&mousedev->client_lock); 519 synchronize_rcu(); 520 } 521 522 static int mousedev_release(struct inode *inode, struct file *file) 523 { 524 struct mousedev_client *client = file->private_data; 525 struct mousedev *mousedev = client->mousedev; 526 527 mousedev_detach_client(mousedev, client); 528 kfree(client); 529 530 mousedev_close_device(mousedev); 531 put_device(&mousedev->dev); 532 533 return 0; 534 } 535 536 static int mousedev_open(struct inode *inode, struct file *file) 537 { 538 struct mousedev_client *client; 539 struct mousedev *mousedev; 540 int error; 541 int i; 542 543 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 544 if (imajor(inode) == MISC_MAJOR) 545 i = MOUSEDEV_MIX; 546 else 547 #endif 548 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 549 550 if (i >= MOUSEDEV_MINORS) 551 return -ENODEV; 552 553 error = mutex_lock_interruptible(&mousedev_table_mutex); 554 if (error) 555 return error; 556 557 mousedev = mousedev_table[i]; 558 if (mousedev) 559 get_device(&mousedev->dev); 560 mutex_unlock(&mousedev_table_mutex); 561 562 if (!mousedev) 563 return -ENODEV; 564 565 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 566 if (!client) { 567 error = -ENOMEM; 568 goto err_put_mousedev; 569 } 570 571 spin_lock_init(&client->packet_lock); 572 client->pos_x = xres / 2; 573 client->pos_y = yres / 2; 574 client->mousedev = mousedev; 575 mousedev_attach_client(mousedev, client); 576 577 error = mousedev_open_device(mousedev); 578 if (error) 579 goto err_free_client; 580 581 file->private_data = client; 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 return error; 590 } 591 592 static inline int mousedev_limit_delta(int delta, int limit) 593 { 594 return delta > limit ? limit : (delta < -limit ? -limit : delta); 595 } 596 597 static void mousedev_packet(struct mousedev_client *client, 598 signed char *ps2_data) 599 { 600 struct mousedev_motion *p = &client->packets[client->tail]; 601 602 ps2_data[0] = 0x08 | 603 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07); 604 ps2_data[1] = mousedev_limit_delta(p->dx, 127); 605 ps2_data[2] = mousedev_limit_delta(p->dy, 127); 606 p->dx -= ps2_data[1]; 607 p->dy -= ps2_data[2]; 608 609 switch (client->mode) { 610 case MOUSEDEV_EMUL_EXPS: 611 ps2_data[3] = mousedev_limit_delta(p->dz, 7); 612 p->dz -= ps2_data[3]; 613 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1); 614 client->bufsiz = 4; 615 break; 616 617 case MOUSEDEV_EMUL_IMPS: 618 ps2_data[0] |= 619 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 620 ps2_data[3] = mousedev_limit_delta(p->dz, 127); 621 p->dz -= ps2_data[3]; 622 client->bufsiz = 4; 623 break; 624 625 case MOUSEDEV_EMUL_PS2: 626 default: 627 ps2_data[0] |= 628 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1); 629 p->dz = 0; 630 client->bufsiz = 3; 631 break; 632 } 633 634 if (!p->dx && !p->dy && !p->dz) { 635 if (client->tail == client->head) { 636 client->ready = 0; 637 client->last_buttons = p->buttons; 638 } else 639 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN; 640 } 641 } 642 643 static void mousedev_generate_response(struct mousedev_client *client, 644 int command) 645 { 646 client->ps2[0] = 0xfa; /* ACK */ 647 648 switch (command) { 649 650 case 0xeb: /* Poll */ 651 mousedev_packet(client, &client->ps2[1]); 652 client->bufsiz++; /* account for leading ACK */ 653 break; 654 655 case 0xf2: /* Get ID */ 656 switch (client->mode) { 657 case MOUSEDEV_EMUL_PS2: 658 client->ps2[1] = 0; 659 break; 660 case MOUSEDEV_EMUL_IMPS: 661 client->ps2[1] = 3; 662 break; 663 case MOUSEDEV_EMUL_EXPS: 664 client->ps2[1] = 4; 665 break; 666 } 667 client->bufsiz = 2; 668 break; 669 670 case 0xe9: /* Get info */ 671 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200; 672 client->bufsiz = 4; 673 break; 674 675 case 0xff: /* Reset */ 676 client->impsseq = client->imexseq = 0; 677 client->mode = MOUSEDEV_EMUL_PS2; 678 client->ps2[1] = 0xaa; client->ps2[2] = 0x00; 679 client->bufsiz = 3; 680 break; 681 682 default: 683 client->bufsiz = 1; 684 break; 685 } 686 client->buffer = client->bufsiz; 687 } 688 689 static ssize_t mousedev_write(struct file *file, const char __user *buffer, 690 size_t count, loff_t *ppos) 691 { 692 struct mousedev_client *client = file->private_data; 693 unsigned char c; 694 unsigned int i; 695 696 for (i = 0; i < count; i++) { 697 698 if (get_user(c, buffer + i)) 699 return -EFAULT; 700 701 spin_lock_irq(&client->packet_lock); 702 703 if (c == mousedev_imex_seq[client->imexseq]) { 704 if (++client->imexseq == MOUSEDEV_SEQ_LEN) { 705 client->imexseq = 0; 706 client->mode = MOUSEDEV_EMUL_EXPS; 707 } 708 } else 709 client->imexseq = 0; 710 711 if (c == mousedev_imps_seq[client->impsseq]) { 712 if (++client->impsseq == MOUSEDEV_SEQ_LEN) { 713 client->impsseq = 0; 714 client->mode = MOUSEDEV_EMUL_IMPS; 715 } 716 } else 717 client->impsseq = 0; 718 719 mousedev_generate_response(client, c); 720 721 spin_unlock_irq(&client->packet_lock); 722 } 723 724 kill_fasync(&client->fasync, SIGIO, POLL_IN); 725 wake_up_interruptible(&client->mousedev->wait); 726 727 return count; 728 } 729 730 static ssize_t mousedev_read(struct file *file, char __user *buffer, 731 size_t count, loff_t *ppos) 732 { 733 struct mousedev_client *client = file->private_data; 734 struct mousedev *mousedev = client->mousedev; 735 signed char data[sizeof(client->ps2)]; 736 int retval = 0; 737 738 if (!client->ready && !client->buffer && mousedev->exist && 739 (file->f_flags & O_NONBLOCK)) 740 return -EAGAIN; 741 742 retval = wait_event_interruptible(mousedev->wait, 743 !mousedev->exist || client->ready || client->buffer); 744 if (retval) 745 return retval; 746 747 if (!mousedev->exist) 748 return -ENODEV; 749 750 spin_lock_irq(&client->packet_lock); 751 752 if (!client->buffer && client->ready) { 753 mousedev_packet(client, client->ps2); 754 client->buffer = client->bufsiz; 755 } 756 757 if (count > client->buffer) 758 count = client->buffer; 759 760 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count); 761 client->buffer -= count; 762 763 spin_unlock_irq(&client->packet_lock); 764 765 if (copy_to_user(buffer, data, count)) 766 return -EFAULT; 767 768 return count; 769 } 770 771 /* No kernel lock - fine */ 772 static unsigned int mousedev_poll(struct file *file, poll_table *wait) 773 { 774 struct mousedev_client *client = file->private_data; 775 struct mousedev *mousedev = client->mousedev; 776 unsigned int mask; 777 778 poll_wait(file, &mousedev->wait, wait); 779 780 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 781 if (client->ready || client->buffer) 782 mask |= POLLIN | POLLRDNORM; 783 784 return mask; 785 } 786 787 static const struct file_operations mousedev_fops = { 788 .owner = THIS_MODULE, 789 .read = mousedev_read, 790 .write = mousedev_write, 791 .poll = mousedev_poll, 792 .open = mousedev_open, 793 .release = mousedev_release, 794 .fasync = mousedev_fasync, 795 .llseek = noop_llseek, 796 }; 797 798 static int mousedev_install_chrdev(struct mousedev *mousedev) 799 { 800 mousedev_table[mousedev->minor] = mousedev; 801 return 0; 802 } 803 804 static void mousedev_remove_chrdev(struct mousedev *mousedev) 805 { 806 mutex_lock(&mousedev_table_mutex); 807 mousedev_table[mousedev->minor] = NULL; 808 mutex_unlock(&mousedev_table_mutex); 809 } 810 811 /* 812 * Mark device non-existent. This disables writes, ioctls and 813 * prevents new users from opening the device. Already posted 814 * blocking reads will stay, however new ones will fail. 815 */ 816 static void mousedev_mark_dead(struct mousedev *mousedev) 817 { 818 mutex_lock(&mousedev->mutex); 819 mousedev->exist = false; 820 mutex_unlock(&mousedev->mutex); 821 } 822 823 /* 824 * Wake up users waiting for IO so they can disconnect from 825 * dead device. 826 */ 827 static void mousedev_hangup(struct mousedev *mousedev) 828 { 829 struct mousedev_client *client; 830 831 spin_lock(&mousedev->client_lock); 832 list_for_each_entry(client, &mousedev->client_list, node) 833 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 834 spin_unlock(&mousedev->client_lock); 835 836 wake_up_interruptible(&mousedev->wait); 837 } 838 839 static void mousedev_cleanup(struct mousedev *mousedev) 840 { 841 struct input_handle *handle = &mousedev->handle; 842 843 mousedev_mark_dead(mousedev); 844 mousedev_hangup(mousedev); 845 mousedev_remove_chrdev(mousedev); 846 847 /* mousedev is marked dead so no one else accesses mousedev->open */ 848 if (mousedev->open) 849 input_close_device(handle); 850 } 851 852 static struct mousedev *mousedev_create(struct input_dev *dev, 853 struct input_handler *handler, 854 int minor) 855 { 856 struct mousedev *mousedev; 857 int error; 858 859 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 860 if (!mousedev) { 861 error = -ENOMEM; 862 goto err_out; 863 } 864 865 INIT_LIST_HEAD(&mousedev->client_list); 866 INIT_LIST_HEAD(&mousedev->mixdev_node); 867 spin_lock_init(&mousedev->client_lock); 868 mutex_init(&mousedev->mutex); 869 lockdep_set_subclass(&mousedev->mutex, 870 minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0); 871 init_waitqueue_head(&mousedev->wait); 872 873 if (minor == MOUSEDEV_MIX) 874 dev_set_name(&mousedev->dev, "mice"); 875 else 876 dev_set_name(&mousedev->dev, "mouse%d", minor); 877 878 mousedev->minor = minor; 879 mousedev->exist = true; 880 mousedev->handle.dev = input_get_device(dev); 881 mousedev->handle.name = dev_name(&mousedev->dev); 882 mousedev->handle.handler = handler; 883 mousedev->handle.private = mousedev; 884 885 mousedev->dev.class = &input_class; 886 if (dev) 887 mousedev->dev.parent = &dev->dev; 888 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 889 mousedev->dev.release = mousedev_free; 890 device_initialize(&mousedev->dev); 891 892 if (minor != MOUSEDEV_MIX) { 893 error = input_register_handle(&mousedev->handle); 894 if (error) 895 goto err_free_mousedev; 896 } 897 898 error = mousedev_install_chrdev(mousedev); 899 if (error) 900 goto err_unregister_handle; 901 902 error = device_add(&mousedev->dev); 903 if (error) 904 goto err_cleanup_mousedev; 905 906 return mousedev; 907 908 err_cleanup_mousedev: 909 mousedev_cleanup(mousedev); 910 err_unregister_handle: 911 if (minor != MOUSEDEV_MIX) 912 input_unregister_handle(&mousedev->handle); 913 err_free_mousedev: 914 put_device(&mousedev->dev); 915 err_out: 916 return ERR_PTR(error); 917 } 918 919 static void mousedev_destroy(struct mousedev *mousedev) 920 { 921 device_del(&mousedev->dev); 922 mousedev_cleanup(mousedev); 923 if (mousedev->minor != MOUSEDEV_MIX) 924 input_unregister_handle(&mousedev->handle); 925 put_device(&mousedev->dev); 926 } 927 928 static int mixdev_add_device(struct mousedev *mousedev) 929 { 930 int retval; 931 932 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 933 if (retval) 934 return retval; 935 936 if (mousedev_mix->open) { 937 retval = mousedev_open_device(mousedev); 938 if (retval) 939 goto out; 940 941 mousedev->mixdev_open = 1; 942 } 943 944 get_device(&mousedev->dev); 945 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 946 947 out: 948 mutex_unlock(&mousedev_mix->mutex); 949 return retval; 950 } 951 952 static void mixdev_remove_device(struct mousedev *mousedev) 953 { 954 mutex_lock(&mousedev_mix->mutex); 955 956 if (mousedev->mixdev_open) { 957 mousedev->mixdev_open = 0; 958 mousedev_close_device(mousedev); 959 } 960 961 list_del_init(&mousedev->mixdev_node); 962 mutex_unlock(&mousedev_mix->mutex); 963 964 put_device(&mousedev->dev); 965 } 966 967 static int mousedev_connect(struct input_handler *handler, 968 struct input_dev *dev, 969 const struct input_device_id *id) 970 { 971 struct mousedev *mousedev; 972 int minor; 973 int error; 974 975 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 976 if (!mousedev_table[minor]) 977 break; 978 979 if (minor == MOUSEDEV_MINORS) { 980 pr_err("no more free mousedev devices\n"); 981 return -ENFILE; 982 } 983 984 mousedev = mousedev_create(dev, handler, minor); 985 if (IS_ERR(mousedev)) 986 return PTR_ERR(mousedev); 987 988 error = mixdev_add_device(mousedev); 989 if (error) { 990 mousedev_destroy(mousedev); 991 return error; 992 } 993 994 return 0; 995 } 996 997 static void mousedev_disconnect(struct input_handle *handle) 998 { 999 struct mousedev *mousedev = handle->private; 1000 1001 mixdev_remove_device(mousedev); 1002 mousedev_destroy(mousedev); 1003 } 1004 1005 static const struct input_device_id mousedev_ids[] = { 1006 { 1007 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1008 INPUT_DEVICE_ID_MATCH_KEYBIT | 1009 INPUT_DEVICE_ID_MATCH_RELBIT, 1010 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1011 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1012 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1013 }, /* A mouse like device, at least one button, 1014 two relative axes */ 1015 { 1016 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1017 INPUT_DEVICE_ID_MATCH_RELBIT, 1018 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1019 .relbit = { BIT_MASK(REL_WHEEL) }, 1020 }, /* A separate scrollwheel */ 1021 { 1022 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1023 INPUT_DEVICE_ID_MATCH_KEYBIT | 1024 INPUT_DEVICE_ID_MATCH_ABSBIT, 1025 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1026 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1027 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1028 }, /* A tablet like device, at least touch detection, 1029 two absolute axes */ 1030 { 1031 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1032 INPUT_DEVICE_ID_MATCH_KEYBIT | 1033 INPUT_DEVICE_ID_MATCH_ABSBIT, 1034 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1035 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1036 BIT_MASK(BTN_TOOL_FINGER) }, 1037 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1038 BIT_MASK(ABS_PRESSURE) | 1039 BIT_MASK(ABS_TOOL_WIDTH) }, 1040 }, /* A touchpad */ 1041 { 1042 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1043 INPUT_DEVICE_ID_MATCH_KEYBIT | 1044 INPUT_DEVICE_ID_MATCH_ABSBIT, 1045 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1046 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1047 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1048 }, /* Mouse-like device with absolute X and Y but ordinary 1049 clicks, like hp ILO2 High Performance mouse */ 1050 1051 { }, /* Terminating entry */ 1052 }; 1053 1054 MODULE_DEVICE_TABLE(input, mousedev_ids); 1055 1056 static struct input_handler mousedev_handler = { 1057 .event = mousedev_event, 1058 .connect = mousedev_connect, 1059 .disconnect = mousedev_disconnect, 1060 .fops = &mousedev_fops, 1061 .minor = MOUSEDEV_MINOR_BASE, 1062 .name = "mousedev", 1063 .id_table = mousedev_ids, 1064 }; 1065 1066 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1067 static struct miscdevice psaux_mouse = { 1068 PSMOUSE_MINOR, "psaux", &mousedev_fops 1069 }; 1070 static int psaux_registered; 1071 #endif 1072 1073 static int __init mousedev_init(void) 1074 { 1075 int error; 1076 1077 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1078 if (IS_ERR(mousedev_mix)) 1079 return PTR_ERR(mousedev_mix); 1080 1081 error = input_register_handler(&mousedev_handler); 1082 if (error) { 1083 mousedev_destroy(mousedev_mix); 1084 return error; 1085 } 1086 1087 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1088 error = misc_register(&psaux_mouse); 1089 if (error) 1090 pr_warn("could not register psaux device, error: %d\n", 1091 error); 1092 else 1093 psaux_registered = 1; 1094 #endif 1095 1096 pr_info("PS/2 mouse device common for all mice\n"); 1097 1098 return 0; 1099 } 1100 1101 static void __exit mousedev_exit(void) 1102 { 1103 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1104 if (psaux_registered) 1105 misc_deregister(&psaux_mouse); 1106 #endif 1107 input_unregister_handler(&mousedev_handler); 1108 mousedev_destroy(mousedev_mix); 1109 } 1110 1111 module_init(mousedev_init); 1112 module_exit(mousedev_exit); 1113