mousedev.c revision 8c127f0717b438e6abc3d92d4ae248c4224b9dcb
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 32MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 33MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces"); 34MODULE_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 43static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X; 44module_param(xres, uint, 0644); 45MODULE_PARM_DESC(xres, "Horizontal screen resolution"); 46 47static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y; 48module_param(yres, uint, 0644); 49MODULE_PARM_DESC(yres, "Vertical screen resolution"); 50 51static unsigned tap_time = 200; 52module_param(tap_time, uint, 0644); 53MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)"); 54 55struct mousedev_hw_data { 56 int dx, dy, dz; 57 int x, y; 58 int abs_event; 59 unsigned long buttons; 60}; 61 62struct 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 83enum mousedev_emul { 84 MOUSEDEV_EMUL_PS2, 85 MOUSEDEV_EMUL_IMPS, 86 MOUSEDEV_EMUL_EXPS 87}; 88 89struct mousedev_motion { 90 int dx, dy, dz; 91 unsigned long buttons; 92}; 93 94#define PACKET_QUEUE_LEN 16 95struct 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 114static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 }; 115static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 }; 116 117static struct input_handler mousedev_handler; 118 119static struct mousedev *mousedev_table[MOUSEDEV_MINORS]; 120static DEFINE_MUTEX(mousedev_table_mutex); 121static struct mousedev *mousedev_mix; 122static LIST_HEAD(mousedev_mix_list); 123 124static void mixdev_open_devices(void); 125static 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 130static 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 175static 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 212static 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 230static 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 269static 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 328static 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 355static 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 413static 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 420static 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 428static 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 450static 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 */ 467static 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 */ 489static 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 505static 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 513static 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 522static 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 536static 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 } 565 566 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL); 567 if (!client) { 568 error = -ENOMEM; 569 goto err_put_mousedev; 570 } 571 572 spin_lock_init(&client->packet_lock); 573 client->pos_x = xres / 2; 574 client->pos_y = yres / 2; 575 client->mousedev = mousedev; 576 mousedev_attach_client(mousedev, client); 577 578 error = mousedev_open_device(mousedev); 579 if (error) 580 goto err_free_client; 581 582 file->private_data = client; 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 return error; 591} 592 593static inline int mousedev_limit_delta(int delta, int limit) 594{ 595 return delta > limit ? limit : (delta < -limit ? -limit : delta); 596} 597 598static 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 644static 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 690static 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 731static 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 */ 773static 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 unsigned int mask; 778 779 poll_wait(file, &mousedev->wait, wait); 780 781 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; 782 if (client->ready || client->buffer) 783 mask |= POLLIN | POLLRDNORM; 784 785 return mask; 786} 787 788static const struct file_operations mousedev_fops = { 789 .owner = THIS_MODULE, 790 .read = mousedev_read, 791 .write = mousedev_write, 792 .poll = mousedev_poll, 793 .open = mousedev_open, 794 .release = mousedev_release, 795 .fasync = mousedev_fasync, 796 .llseek = noop_llseek, 797}; 798 799static int mousedev_install_chrdev(struct mousedev *mousedev) 800{ 801 mousedev_table[mousedev->minor] = mousedev; 802 return 0; 803} 804 805static void mousedev_remove_chrdev(struct mousedev *mousedev) 806{ 807 mutex_lock(&mousedev_table_mutex); 808 mousedev_table[mousedev->minor] = NULL; 809 mutex_unlock(&mousedev_table_mutex); 810} 811 812/* 813 * Mark device non-existent. This disables writes, ioctls and 814 * prevents new users from opening the device. Already posted 815 * blocking reads will stay, however new ones will fail. 816 */ 817static void mousedev_mark_dead(struct mousedev *mousedev) 818{ 819 mutex_lock(&mousedev->mutex); 820 mousedev->exist = false; 821 mutex_unlock(&mousedev->mutex); 822} 823 824/* 825 * Wake up users waiting for IO so they can disconnect from 826 * dead device. 827 */ 828static void mousedev_hangup(struct mousedev *mousedev) 829{ 830 struct mousedev_client *client; 831 832 spin_lock(&mousedev->client_lock); 833 list_for_each_entry(client, &mousedev->client_list, node) 834 kill_fasync(&client->fasync, SIGIO, POLL_HUP); 835 spin_unlock(&mousedev->client_lock); 836 837 wake_up_interruptible(&mousedev->wait); 838} 839 840static void mousedev_cleanup(struct mousedev *mousedev) 841{ 842 struct input_handle *handle = &mousedev->handle; 843 844 mousedev_mark_dead(mousedev); 845 mousedev_hangup(mousedev); 846 mousedev_remove_chrdev(mousedev); 847 848 /* mousedev is marked dead so no one else accesses mousedev->open */ 849 if (mousedev->open) 850 input_close_device(handle); 851} 852 853static struct mousedev *mousedev_create(struct input_dev *dev, 854 struct input_handler *handler, 855 int minor) 856{ 857 struct mousedev *mousedev; 858 int error; 859 860 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL); 861 if (!mousedev) { 862 error = -ENOMEM; 863 goto err_out; 864 } 865 866 INIT_LIST_HEAD(&mousedev->client_list); 867 INIT_LIST_HEAD(&mousedev->mixdev_node); 868 spin_lock_init(&mousedev->client_lock); 869 mutex_init(&mousedev->mutex); 870 lockdep_set_subclass(&mousedev->mutex, 871 minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0); 872 init_waitqueue_head(&mousedev->wait); 873 874 if (minor == MOUSEDEV_MIX) 875 dev_set_name(&mousedev->dev, "mice"); 876 else 877 dev_set_name(&mousedev->dev, "mouse%d", minor); 878 879 mousedev->minor = minor; 880 mousedev->exist = true; 881 mousedev->handle.dev = input_get_device(dev); 882 mousedev->handle.name = dev_name(&mousedev->dev); 883 mousedev->handle.handler = handler; 884 mousedev->handle.private = mousedev; 885 886 mousedev->dev.class = &input_class; 887 if (dev) 888 mousedev->dev.parent = &dev->dev; 889 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor); 890 mousedev->dev.release = mousedev_free; 891 device_initialize(&mousedev->dev); 892 893 if (minor != MOUSEDEV_MIX) { 894 error = input_register_handle(&mousedev->handle); 895 if (error) 896 goto err_free_mousedev; 897 } 898 899 error = mousedev_install_chrdev(mousedev); 900 if (error) 901 goto err_unregister_handle; 902 903 error = device_add(&mousedev->dev); 904 if (error) 905 goto err_cleanup_mousedev; 906 907 return mousedev; 908 909 err_cleanup_mousedev: 910 mousedev_cleanup(mousedev); 911 err_unregister_handle: 912 if (minor != MOUSEDEV_MIX) 913 input_unregister_handle(&mousedev->handle); 914 err_free_mousedev: 915 put_device(&mousedev->dev); 916 err_out: 917 return ERR_PTR(error); 918} 919 920static void mousedev_destroy(struct mousedev *mousedev) 921{ 922 device_del(&mousedev->dev); 923 mousedev_cleanup(mousedev); 924 if (mousedev->minor != MOUSEDEV_MIX) 925 input_unregister_handle(&mousedev->handle); 926 put_device(&mousedev->dev); 927} 928 929static int mixdev_add_device(struct mousedev *mousedev) 930{ 931 int retval; 932 933 retval = mutex_lock_interruptible(&mousedev_mix->mutex); 934 if (retval) 935 return retval; 936 937 if (mousedev_mix->open) { 938 retval = mousedev_open_device(mousedev); 939 if (retval) 940 goto out; 941 942 mousedev->mixdev_open = 1; 943 } 944 945 get_device(&mousedev->dev); 946 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list); 947 948 out: 949 mutex_unlock(&mousedev_mix->mutex); 950 return retval; 951} 952 953static void mixdev_remove_device(struct mousedev *mousedev) 954{ 955 mutex_lock(&mousedev_mix->mutex); 956 957 if (mousedev->mixdev_open) { 958 mousedev->mixdev_open = 0; 959 mousedev_close_device(mousedev); 960 } 961 962 list_del_init(&mousedev->mixdev_node); 963 mutex_unlock(&mousedev_mix->mutex); 964 965 put_device(&mousedev->dev); 966} 967 968static int mousedev_connect(struct input_handler *handler, 969 struct input_dev *dev, 970 const struct input_device_id *id) 971{ 972 struct mousedev *mousedev; 973 int minor; 974 int error; 975 976 for (minor = 0; minor < MOUSEDEV_MINORS; minor++) 977 if (!mousedev_table[minor]) 978 break; 979 980 if (minor == MOUSEDEV_MINORS) { 981 pr_err("no more free mousedev devices\n"); 982 return -ENFILE; 983 } 984 985 mousedev = mousedev_create(dev, handler, minor); 986 if (IS_ERR(mousedev)) 987 return PTR_ERR(mousedev); 988 989 error = mixdev_add_device(mousedev); 990 if (error) { 991 mousedev_destroy(mousedev); 992 return error; 993 } 994 995 return 0; 996} 997 998static void mousedev_disconnect(struct input_handle *handle) 999{ 1000 struct mousedev *mousedev = handle->private; 1001 1002 mixdev_remove_device(mousedev); 1003 mousedev_destroy(mousedev); 1004} 1005 1006static const struct input_device_id mousedev_ids[] = { 1007 { 1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1009 INPUT_DEVICE_ID_MATCH_KEYBIT | 1010 INPUT_DEVICE_ID_MATCH_RELBIT, 1011 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1012 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1013 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) }, 1014 }, /* A mouse like device, at least one button, 1015 two relative axes */ 1016 { 1017 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1018 INPUT_DEVICE_ID_MATCH_RELBIT, 1019 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) }, 1020 .relbit = { BIT_MASK(REL_WHEEL) }, 1021 }, /* A separate scrollwheel */ 1022 { 1023 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1024 INPUT_DEVICE_ID_MATCH_KEYBIT | 1025 INPUT_DEVICE_ID_MATCH_ABSBIT, 1026 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1027 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, 1028 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1029 }, /* A tablet like device, at least touch detection, 1030 two absolute axes */ 1031 { 1032 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1033 INPUT_DEVICE_ID_MATCH_KEYBIT | 1034 INPUT_DEVICE_ID_MATCH_ABSBIT, 1035 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1036 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] = 1037 BIT_MASK(BTN_TOOL_FINGER) }, 1038 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | 1039 BIT_MASK(ABS_PRESSURE) | 1040 BIT_MASK(ABS_TOOL_WIDTH) }, 1041 }, /* A touchpad */ 1042 { 1043 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | 1044 INPUT_DEVICE_ID_MATCH_KEYBIT | 1045 INPUT_DEVICE_ID_MATCH_ABSBIT, 1046 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) }, 1047 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) }, 1048 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, 1049 }, /* Mouse-like device with absolute X and Y but ordinary 1050 clicks, like hp ILO2 High Performance mouse */ 1051 1052 { }, /* Terminating entry */ 1053}; 1054 1055MODULE_DEVICE_TABLE(input, mousedev_ids); 1056 1057static struct input_handler mousedev_handler = { 1058 .event = mousedev_event, 1059 .connect = mousedev_connect, 1060 .disconnect = mousedev_disconnect, 1061 .fops = &mousedev_fops, 1062 .minor = MOUSEDEV_MINOR_BASE, 1063 .name = "mousedev", 1064 .id_table = mousedev_ids, 1065}; 1066 1067#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1068static struct miscdevice psaux_mouse = { 1069 PSMOUSE_MINOR, "psaux", &mousedev_fops 1070}; 1071static int psaux_registered; 1072#endif 1073 1074static int __init mousedev_init(void) 1075{ 1076 int error; 1077 1078 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX); 1079 if (IS_ERR(mousedev_mix)) 1080 return PTR_ERR(mousedev_mix); 1081 1082 error = input_register_handler(&mousedev_handler); 1083 if (error) { 1084 mousedev_destroy(mousedev_mix); 1085 return error; 1086 } 1087 1088#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1089 error = misc_register(&psaux_mouse); 1090 if (error) 1091 pr_warning("could not register psaux device, error: %d\n", 1092 error); 1093 else 1094 psaux_registered = 1; 1095#endif 1096 1097 pr_info("PS/2 mouse device common for all mice\n"); 1098 1099 return 0; 1100} 1101 1102static void __exit mousedev_exit(void) 1103{ 1104#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX 1105 if (psaux_registered) 1106 misc_deregister(&psaux_mouse); 1107#endif 1108 input_unregister_handler(&mousedev_handler); 1109 mousedev_destroy(mousedev_mix); 1110} 1111 1112module_init(mousedev_init); 1113module_exit(mousedev_exit); 1114