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_fasync(-1, file, 0); 523 mousedev_detach_client(mousedev, client); 524 kfree(client); 525 526 mousedev_close_device(mousedev); 527 put_device(&mousedev->dev); 528 529 return 0; 530 } 531 532 static int mousedev_open(struct inode *inode, struct file *file) 533 { 534 struct mousedev_client *client; 535 struct mousedev *mousedev; 536 int error; 537 int i; 538 539 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 540 if (imajor(inode) == MISC_MAJOR) 541 i = MOUSEDEV_MIX; 542 else 543 #endif 544 i = iminor(inode) - MOUSEDEV_MINOR_BASE; 545 546 if (i >= MOUSEDEV_MINORS) 547 return -ENODEV; 548 549 lock_kernel(); 550 error = mutex_lock_interruptible(&mousedev_table_mutex); 551 if (error) { 552 unlock_kernel(); 553 return error; 554 } 555 mousedev = mousedev_table[i]; 556 if (mousedev) 557 get_device(&mousedev->dev); 558 mutex_unlock(&mousedev_table_mutex); 559 560 if (!mousedev) { 561 unlock_kernel(); 562 return -ENODEV; 563 } 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 unlock_kernel(); 583 return 0; 584 585 err_free_client: 586 mousedev_detach_client(mousedev, client); 587 kfree(client); 588 err_put_mousedev: 589 put_device(&mousedev->dev); 590 unlock_kernel(); 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; 778 779 poll_wait(file, &mousedev->wait, wait); 780 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) | 781 (mousedev->exist ? 0 : (POLLHUP | POLLERR)); 782 } 783 784 static const struct file_operations mousedev_fops = { 785 .owner = THIS_MODULE, 786 .read = mousedev_read, 787 .write = mousedev_write, 788 .poll = mousedev_poll, 789 .open = mousedev_open, 790 .release = mousedev_release, 791 .fasync = mousedev_fasync, 792 }; 793 794 static int mousedev_install_chrdev(struct mousedev *mousedev) 795 { 796 mousedev_table[mousedev->minor] = mousedev; 797 return 0; 798 } 799 800 static void mousedev_remove_chrdev(struct mousedev *mousedev) 801 { 802 mutex_lock(&mousedev_table_mutex); 803 mousedev_table[mousedev->minor] = NULL; 804 mutex_unlock(&mousedev_table_mutex); 805 } 806 807 /* 808 * Mark device non-existent. This disables writes, ioctls and 809 * prevents new users from opening the device. Already posted 810 * blocking reads will stay, however new ones will fail. 811 */ 812 static void mousedev_mark_dead(struct mousedev *mousedev) 813 { 814 mutex_lock(&mousedev->mutex); 815 mousedev->exist = 0; 816 mutex_unlock(&mousedev->mutex); 817 } 818 819 /* 820 * Wake up users waiting for IO so they can disconnect from 821 * dead device. 822 */ 823 static void mousedev_hangup(struct mousedev *mousedev) 824 { 825 struct mousedev_client *client; 826 827 spin_lock(&mousedev->client_lock); 828 list_for_each_entry(client, &mousedev->client_list, node) 829 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 830 spin_unlock(&mousedev->client_lock); 831 832 wake_up_interruptible(&mousedev->wait); 833 } 834 835 static void mousedev_cleanup(struct mousedev *mousedev) 836 { 837 struct input_handle *handle = &mousedev->handle; 838 839 mousedev_mark_dead(mousedev); 840 mousedev_hangup(mousedev); 841 mousedev_remove_chrdev(mousedev); 842 843 /* mousedev is marked dead so no one else accesses mousedev->open */ 844 if (mousedev->open) 845 input_close_device(handle); 846 } 847 848 static struct mousedev *mousedev_create(struct input_dev *dev, 849 struct input_handler *handler, 850 int minor) 851 { 852 struct mousedev *mousedev; 853 int error; 854 855 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 856 if (!mousedev) { 857 error = -ENOMEM; 858 goto err_out; 859 } 860 861 INIT_LIST_HEAD(&mousedev->client_list); 862 INIT_LIST_HEAD(&mousedev->mixdev_node); 863 spin_lock_init(&mousedev->client_lock); 864 mutex_init(&mousedev->mutex); 865 lockdep_set_subclass(&mousedev->mutex, 866 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0); 867 init_waitqueue_head(&mousedev->wait); 868 869 if (minor == MOUSEDEV_MIX) 870 strlcpy(mousedev->name, "mice", sizeof(mousedev->name)); 871 else 872 snprintf(mousedev->name, sizeof(mousedev->name), 873 "mouse%d", minor); 874 875 mousedev->minor = minor; 876 mousedev->exist = 1; 877 mousedev->handle.dev = input_get_device(dev); 878 mousedev->handle.name = mousedev->name; 879 mousedev->handle.handler = handler; 880 mousedev->handle.private = mousedev; 881 882 strlcpy(mousedev->dev.bus_id, mousedev->name, 883 sizeof(mousedev->dev.bus_id)); 884 mousedev->dev.class = &input_class; 885 if (dev) 886 mousedev->dev.parent = &dev->dev; 887 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 888 mousedev->dev.release = mousedev_free; 889 device_initialize(&mousedev->dev); 890 891 if (minor != MOUSEDEV_MIX) { 892 error = input_register_handle(&mousedev->handle); 893 if (error) 894 goto err_free_mousedev; 895 } 896 897 error = mousedev_install_chrdev(mousedev); 898 if (error) 899 goto err_unregister_handle; 900 901 error = device_add(&mousedev->dev); 902 if (error) 903 goto err_cleanup_mousedev; 904 905 return mousedev; 906 907 err_cleanup_mousedev: 908 mousedev_cleanup(mousedev); 909 err_unregister_handle: 910 if (minor != MOUSEDEV_MIX) 911 input_unregister_handle(&mousedev->handle); 912 err_free_mousedev: 913 put_device(&mousedev->dev); 914 err_out: 915 return ERR_PTR(error); 916 } 917 918 static void mousedev_destroy(struct mousedev *mousedev) 919 { 920 device_del(&mousedev->dev); 921 mousedev_cleanup(mousedev); 922 if (mousedev->minor != MOUSEDEV_MIX) 923 input_unregister_handle(&mousedev->handle); 924 put_device(&mousedev->dev); 925 } 926 927 static int mixdev_add_device(struct mousedev *mousedev) 928 { 929 int retval; 930 931 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 932 if (retval) 933 return retval; 934 935 if (mousedev_mix->open) { 936 retval = mousedev_open_device(mousedev); 937 if (retval) 938 goto out; 939 940 mousedev->mixdev_open = 1; 941 } 942 943 get_device(&mousedev->dev); 944 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 945 946 out: 947 mutex_unlock(&mousedev_mix->mutex); 948 return retval; 949 } 950 951 static void mixdev_remove_device(struct mousedev *mousedev) 952 { 953 mutex_lock(&mousedev_mix->mutex); 954 955 if (mousedev->mixdev_open) { 956 mousedev->mixdev_open = 0; 957 mousedev_close_device(mousedev); 958 } 959 960 list_del_init(&mousedev->mixdev_node); 961 mutex_unlock(&mousedev_mix->mutex); 962 963 put_device(&mousedev->dev); 964 } 965 966 static int mousedev_connect(struct input_handler *handler, 967 struct input_dev *dev, 968 const struct input_device_id *id) 969 { 970 struct mousedev *mousedev; 971 int minor; 972 int error; 973 974 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 975 if (!mousedev_table[minor]) 976 break; 977 978 if (minor == MOUSEDEV_MINORS) { 979 printk(KERN_ERR "mousedev: no more free mousedev devices\n"); 980 return -ENFILE; 981 } 982 983 mousedev = mousedev_create(dev, handler, minor); 984 if (IS_ERR(mousedev)) 985 return PTR_ERR(mousedev); 986 987 error = mixdev_add_device(mousedev); 988 if (error) { 989 mousedev_destroy(mousedev); 990 return error; 991 } 992 993 return 0; 994 } 995 996 static void mousedev_disconnect(struct input_handle *handle) 997 { 998 struct mousedev *mousedev = handle->private; 999 1000 mixdev_remove_device(mousedev); 1001 mousedev_destroy(mousedev); 1002 } 1003 1004 static const struct input_device_id mousedev_ids[] = { 1005 { 1006 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1007 INPUT_DEVICE_ID_MATCH_KEYBIT | 1008 INPUT_DEVICE_ID_MATCH_RELBIT, 1009 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1010 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1011 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1012 }, /* A mouse like device, at least one button, 1013 two relative axes */ 1014 { 1015 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1016 INPUT_DEVICE_ID_MATCH_RELBIT, 1017 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1018 .relbit = { BIT_MASK(REL_WHEEL) }, 1019 }, /* A separate scrollwheel */ 1020 { 1021 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1022 INPUT_DEVICE_ID_MATCH_KEYBIT | 1023 INPUT_DEVICE_ID_MATCH_ABSBIT, 1024 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1025 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1026 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1027 }, /* A tablet like device, at least touch detection, 1028 two absolute axes */ 1029 { 1030 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1031 INPUT_DEVICE_ID_MATCH_KEYBIT | 1032 INPUT_DEVICE_ID_MATCH_ABSBIT, 1033 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1034 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1035 BIT_MASK(BTN_TOOL_FINGER) }, 1036 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1037 BIT_MASK(ABS_PRESSURE) | 1038 BIT_MASK(ABS_TOOL_WIDTH) }, 1039 }, /* A touchpad */ 1040 { 1041 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1042 INPUT_DEVICE_ID_MATCH_KEYBIT | 1043 INPUT_DEVICE_ID_MATCH_ABSBIT, 1044 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1045 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1046 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1047 }, /* Mouse-like device with absolute X and Y but ordinary 1048 clicks, like hp ILO2 High Performance mouse */ 1049 1050 { }, /* Terminating entry */ 1051 }; 1052 1053 MODULE_DEVICE_TABLE(input, mousedev_ids); 1054 1055 static struct input_handler mousedev_handler = { 1056 .event = mousedev_event, 1057 .connect = mousedev_connect, 1058 .disconnect = mousedev_disconnect, 1059 .fops = &mousedev_fops, 1060 .minor = MOUSEDEV_MINOR_BASE, 1061 .name = "mousedev", 1062 .id_table = mousedev_ids, 1063 }; 1064 1065 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1066 static struct miscdevice psaux_mouse = { 1067 PSMOUSE_MINOR, "psaux", &mousedev_fops 1068 }; 1069 static int psaux_registered; 1070 #endif 1071 1072 static int __init mousedev_init(void) 1073 { 1074 int error; 1075 1076 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1077 if (IS_ERR(mousedev_mix)) 1078 return PTR_ERR(mousedev_mix); 1079 1080 error = input_register_handler(&mousedev_handler); 1081 if (error) { 1082 mousedev_destroy(mousedev_mix); 1083 return error; 1084 } 1085 1086 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1087 error = misc_register(&psaux_mouse); 1088 if (error) 1089 printk(KERN_WARNING "mice: could not register psaux device, " 1090 "error: %d\n", error); 1091 else 1092 psaux_registered = 1; 1093 #endif 1094 1095 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n"); 1096 1097 return 0; 1098 } 1099 1100 static void __exit mousedev_exit(void) 1101 { 1102 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1103 if (psaux_registered) 1104 misc_deregister(&psaux_mouse); 1105 #endif 1106 input_unregister_handler(&mousedev_handler); 1107 mousedev_destroy(mousedev_mix); 1108 } 1109 1110 module_init(mousedev_init); 1111 module_exit(mousedev_exit); 1112