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iw_cxgb4: Support ib_alloc_mr verb
[linux-2.6/btrfs-unstable.git] / drivers / input / mousedev.c
blobb604564dec5c9a5d8d154ac18a61c02341f77e5d
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 31
16 #define MOUSEDEV_MIX 63
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/cdev.h>
28 #include <linux/kernel.h>
29
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
31 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
32 MODULE_LICENSE("GPL");
33
34 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
35 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
36 #endif
37 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
38 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
39 #endif
40
41 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
42 module_param(xres, uint, 0644);
43 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
44
45 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
46 module_param(yres, uint, 0644);
47 MODULE_PARM_DESC(yres, "Vertical screen resolution");
48
49 static unsigned tap_time = 200;
50 module_param(tap_time, uint, 0644);
51 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
52
53 struct mousedev_hw_data {
54 int dx, dy, dz;
55 int x, y;
56 int abs_event;
57 unsigned long buttons;
58 };
59
60 struct mousedev {
61 int open;
62 struct input_handle handle;
63 wait_queue_head_t wait;
64 struct list_head client_list;
65 spinlock_t client_lock; /* protects client_list */
66 struct mutex mutex;
67 struct device dev;
68 struct cdev cdev;
69 bool exist;
70
71 struct list_head mixdev_node;
72 bool opened_by_mixdev;
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 int (*open_device)(struct mousedev *mousedev);
81 void (*close_device)(struct mousedev *mousedev);
82 };
83
84 enum mousedev_emul {
85 MOUSEDEV_EMUL_PS2,
86 MOUSEDEV_EMUL_IMPS,
87 MOUSEDEV_EMUL_EXPS
88 };
89
90 struct mousedev_motion {
91 int dx, dy, dz;
92 unsigned long buttons;
93 };
94
95 #define PACKET_QUEUE_LEN 16
96 struct mousedev_client {
97 struct fasync_struct *fasync;
98 struct mousedev *mousedev;
99 struct list_head node;
100
101 struct mousedev_motion packets[PACKET_QUEUE_LEN];
102 unsigned int head, tail;
103 spinlock_t packet_lock;
104 int pos_x, pos_y;
105
106 signed char ps2[6];
107 unsigned char ready, buffer, bufsiz;
108 unsigned char imexseq, impsseq;
109 enum mousedev_emul mode;
110 unsigned long last_buttons;
111 };
112
113 #define MOUSEDEV_SEQ_LEN 6
114
115 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
116 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
117
118 static struct mousedev *mousedev_mix;
119 static LIST_HEAD(mousedev_mix_list);
120
121 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
122 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
123
124 static void mousedev_touchpad_event(struct input_dev *dev,
125 struct mousedev *mousedev,
126 unsigned int code, int value)
127 {
128 int size, tmp;
129 enum { FRACTION_DENOM = 128 };
130
131 switch (code) {
132
133 case ABS_X:
134
135 fx(0) = value;
136 if (mousedev->touch && mousedev->pkt_count >= 2) {
137 size = input_abs_get_max(dev, ABS_X) -
138 input_abs_get_min(dev, ABS_X);
139 if (size == 0)
140 size = 256 * 2;
141
142 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
143 tmp += mousedev->frac_dx;
144 mousedev->packet.dx = tmp / FRACTION_DENOM;
145 mousedev->frac_dx =
146 tmp - mousedev->packet.dx * FRACTION_DENOM;
147 }
148 break;
149
150 case ABS_Y:
151 fy(0) = value;
152 if (mousedev->touch && mousedev->pkt_count >= 2) {
153 /* use X size for ABS_Y to keep the same scale */
154 size = input_abs_get_max(dev, ABS_X) -
155 input_abs_get_min(dev, ABS_X);
156 if (size == 0)
157 size = 256 * 2;
158
159 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
160 tmp += mousedev->frac_dy;
161 mousedev->packet.dy = tmp / FRACTION_DENOM;
162 mousedev->frac_dy = tmp -
163 mousedev->packet.dy * FRACTION_DENOM;
164 }
165 break;
166 }
167 }
168
169 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
170 unsigned int code, int value)
171 {
172 int min, max, size;
173
174 switch (code) {
175
176 case ABS_X:
177 min = input_abs_get_min(dev, ABS_X);
178 max = input_abs_get_max(dev, ABS_X);
179
180 size = max - min;
181 if (size == 0)
182 size = xres ? : 1;
183
184 value = clamp(value, min, max);
185
186 mousedev->packet.x = ((value - min) * xres) / size;
187 mousedev->packet.abs_event = 1;
188 break;
189
190 case ABS_Y:
191 min = input_abs_get_min(dev, ABS_Y);
192 max = input_abs_get_max(dev, ABS_Y);
193
194 size = max - min;
195 if (size == 0)
196 size = yres ? : 1;
197
198 value = clamp(value, min, max);
199
200 mousedev->packet.y = yres - ((value - min) * yres) / size;
201 mousedev->packet.abs_event = 1;
202 break;
203 }
204 }
205
206 static void mousedev_rel_event(struct mousedev *mousedev,
207 unsigned int code, int value)
208 {
209 switch (code) {
210 case REL_X:
211 mousedev->packet.dx += value;
212 break;
213
214 case REL_Y:
215 mousedev->packet.dy -= value;
216 break;
217
218 case REL_WHEEL:
219 mousedev->packet.dz -= value;
220 break;
221 }
222 }
223
224 static void mousedev_key_event(struct mousedev *mousedev,
225 unsigned int code, int value)
226 {
227 int index;
228
229 switch (code) {
230
231 case BTN_TOUCH:
232 case BTN_0:
233 case BTN_LEFT: index = 0; break;
234
235 case BTN_STYLUS:
236 case BTN_1:
237 case BTN_RIGHT: index = 1; break;
238
239 case BTN_2:
240 case BTN_FORWARD:
241 case BTN_STYLUS2:
242 case BTN_MIDDLE: index = 2; break;
243
244 case BTN_3:
245 case BTN_BACK:
246 case BTN_SIDE: index = 3; break;
247
248 case BTN_4:
249 case BTN_EXTRA: index = 4; break;
250
251 default: return;
252 }
253
254 if (value) {
255 set_bit(index, &mousedev->packet.buttons);
256 set_bit(index, &mousedev_mix->packet.buttons);
257 } else {
258 clear_bit(index, &mousedev->packet.buttons);
259 clear_bit(index, &mousedev_mix->packet.buttons);
260 }
261 }
262
263 static void mousedev_notify_readers(struct mousedev *mousedev,
264 struct mousedev_hw_data *packet)
265 {
266 struct mousedev_client *client;
267 struct mousedev_motion *p;
268 unsigned int new_head;
269 int wake_readers = 0;
270
271 rcu_read_lock();
272 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
273
274 /* Just acquire the lock, interrupts already disabled */
275 spin_lock(&client->packet_lock);
276
277 p = &client->packets[client->head];
278 if (client->ready && p->buttons != mousedev->packet.buttons) {
279 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
280 if (new_head != client->tail) {
281 p = &client->packets[client->head = new_head];
282 memset(p, 0, sizeof(struct mousedev_motion));
283 }
284 }
285
286 if (packet->abs_event) {
287 p->dx += packet->x - client->pos_x;
288 p->dy += packet->y - client->pos_y;
289 client->pos_x = packet->x;
290 client->pos_y = packet->y;
291 }
292
293 client->pos_x += packet->dx;
294 client->pos_x = client->pos_x < 0 ?
295 0 : (client->pos_x >= xres ? xres : client->pos_x);
296 client->pos_y += packet->dy;
297 client->pos_y = client->pos_y < 0 ?
298 0 : (client->pos_y >= yres ? yres : client->pos_y);
299
300 p->dx += packet->dx;
301 p->dy += packet->dy;
302 p->dz += packet->dz;
303 p->buttons = mousedev->packet.buttons;
304
305 if (p->dx || p->dy || p->dz ||
306 p->buttons != client->last_buttons)
307 client->ready = 1;
308
309 spin_unlock(&client->packet_lock);
310
311 if (client->ready) {
312 kill_fasync(&client->fasync, SIGIO, POLL_IN);
313 wake_readers = 1;
314 }
315 }
316 rcu_read_unlock();
317
318 if (wake_readers)
319 wake_up_interruptible(&mousedev->wait);
320 }
321
322 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
323 {
324 if (!value) {
325 if (mousedev->touch &&
326 time_before(jiffies,
327 mousedev->touch + msecs_to_jiffies(tap_time))) {
328 /*
329 * Toggle left button to emulate tap.
330 * We rely on the fact that mousedev_mix always has 0
331 * motion packet so we won't mess current position.
332 */
333 set_bit(0, &mousedev->packet.buttons);
334 set_bit(0, &mousedev_mix->packet.buttons);
335 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
336 mousedev_notify_readers(mousedev_mix,
337 &mousedev_mix->packet);
338 clear_bit(0, &mousedev->packet.buttons);
339 clear_bit(0, &mousedev_mix->packet.buttons);
340 }
341 mousedev->touch = mousedev->pkt_count = 0;
342 mousedev->frac_dx = 0;
343 mousedev->frac_dy = 0;
344
345 } else if (!mousedev->touch)
346 mousedev->touch = jiffies;
347 }
348
349 static void mousedev_event(struct input_handle *handle,
350 unsigned int type, unsigned int code, int value)
351 {
352 struct mousedev *mousedev = handle->private;
353
354 switch (type) {
355
356 case EV_ABS:
357 /* Ignore joysticks */
358 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
359 return;
360
361 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
362 mousedev_touchpad_event(handle->dev,
363 mousedev, code, value);
364 else
365 mousedev_abs_event(handle->dev, mousedev, code, value);
366
367 break;
368
369 case EV_REL:
370 mousedev_rel_event(mousedev, code, value);
371 break;
372
373 case EV_KEY:
374 if (value != 2) {
375 if (code == BTN_TOUCH &&
376 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
377 mousedev_touchpad_touch(mousedev, value);
378 else
379 mousedev_key_event(mousedev, code, value);
380 }
381 break;
382
383 case EV_SYN:
384 if (code == SYN_REPORT) {
385 if (mousedev->touch) {
386 mousedev->pkt_count++;
387 /*
388 * Input system eats duplicate events,
389 * but we need all of them to do correct
390 * averaging so apply present one forward
391 */
392 fx(0) = fx(1);
393 fy(0) = fy(1);
394 }
395
396 mousedev_notify_readers(mousedev, &mousedev->packet);
397 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
398
399 mousedev->packet.dx = mousedev->packet.dy =
400 mousedev->packet.dz = 0;
401 mousedev->packet.abs_event = 0;
402 }
403 break;
404 }
405 }
406
407 static int mousedev_fasync(int fd, struct file *file, int on)
408 {
409 struct mousedev_client *client = file->private_data;
410
411 return fasync_helper(fd, file, on, &client->fasync);
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->exist)
431 retval = -ENODEV;
432 else if (!mousedev->open++) {
433 retval = input_open_device(&mousedev->handle);
434 if (retval)
435 mousedev->open--;
436 }
437
438 mutex_unlock(&mousedev->mutex);
439 return retval;
440 }
441
442 static void mousedev_close_device(struct mousedev *mousedev)
443 {
444 mutex_lock(&mousedev->mutex);
445
446 if (mousedev->exist && !--mousedev->open)
447 input_close_device(&mousedev->handle);
448
449 mutex_unlock(&mousedev->mutex);
450 }
451
452 /*
453 * Open all available devices so they can all be multiplexed in one.
454 * stream. Note that this function is called with mousedev_mix->mutex
455 * held.
456 */
457 static int mixdev_open_devices(struct mousedev *mixdev)
458 {
459 int error;
460
461 error = mutex_lock_interruptible(&mixdev->mutex);
462 if (error)
463 return error;
464
465 if (!mixdev->open++) {
466 struct mousedev *mousedev;
467
468 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
469 if (!mousedev->opened_by_mixdev) {
470 if (mousedev_open_device(mousedev))
471 continue;
472
473 mousedev->opened_by_mixdev = true;
474 }
475 }
476 }
477
478 mutex_unlock(&mixdev->mutex);
479 return 0;
480 }
481
482 /*
483 * Close all devices that were opened as part of multiplexed
484 * device. Note that this function is called with mousedev_mix->mutex
485 * held.
486 */
487 static void mixdev_close_devices(struct mousedev *mixdev)
488 {
489 mutex_lock(&mixdev->mutex);
490
491 if (!--mixdev->open) {
492 struct mousedev *mousedev;
493
494 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
495 if (mousedev->opened_by_mixdev) {
496 mousedev->opened_by_mixdev = false;
497 mousedev_close_device(mousedev);
498 }
499 }
500 }
501
502 mutex_unlock(&mixdev->mutex);
503 }
504
505
506 static void mousedev_attach_client(struct mousedev *mousedev,
507 struct mousedev_client *client)
508 {
509 spin_lock(&mousedev->client_lock);
510 list_add_tail_rcu(&client->node, &mousedev->client_list);
511 spin_unlock(&mousedev->client_lock);
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
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
542 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
543 if (imajor(inode) == MISC_MAJOR)
544 mousedev = mousedev_mix;
545 else
546 #endif
547 mousedev = container_of(inode->i_cdev, struct mousedev, cdev);
548
549 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
550 if (!client)
551 return -ENOMEM;
552
553 spin_lock_init(&client->packet_lock);
554 client->pos_x = xres / 2;
555 client->pos_y = yres / 2;
556 client->mousedev = mousedev;
557 mousedev_attach_client(mousedev, client);
558
559 error = mousedev->open_device(mousedev);
560 if (error)
561 goto err_free_client;
562
563 file->private_data = client;
564 nonseekable_open(inode, file);
565
566 return 0;
567
568 err_free_client:
569 mousedev_detach_client(mousedev, client);
570 kfree(client);
571 return error;
572 }
573
574 static inline int mousedev_limit_delta(int delta, int limit)
575 {
576 return delta > limit ? limit : (delta < -limit ? -limit : delta);
577 }
578
579 static void mousedev_packet(struct mousedev_client *client,
580 signed char *ps2_data)
581 {
582 struct mousedev_motion *p = &client->packets[client->tail];
583
584 ps2_data[0] = 0x08 |
585 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
586 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
587 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
588 p->dx -= ps2_data[1];
589 p->dy -= ps2_data[2];
590
591 switch (client->mode) {
592 case MOUSEDEV_EMUL_EXPS:
593 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
594 p->dz -= ps2_data[3];
595 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
596 client->bufsiz = 4;
597 break;
598
599 case MOUSEDEV_EMUL_IMPS:
600 ps2_data[0] |=
601 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
602 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
603 p->dz -= ps2_data[3];
604 client->bufsiz = 4;
605 break;
606
607 case MOUSEDEV_EMUL_PS2:
608 default:
609 ps2_data[0] |=
610 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
611 p->dz = 0;
612 client->bufsiz = 3;
613 break;
614 }
615
616 if (!p->dx && !p->dy && !p->dz) {
617 if (client->tail == client->head) {
618 client->ready = 0;
619 client->last_buttons = p->buttons;
620 } else
621 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
622 }
623 }
624
625 static void mousedev_generate_response(struct mousedev_client *client,
626 int command)
627 {
628 client->ps2[0] = 0xfa; /* ACK */
629
630 switch (command) {
631
632 case 0xeb: /* Poll */
633 mousedev_packet(client, &client->ps2[1]);
634 client->bufsiz++; /* account for leading ACK */
635 break;
636
637 case 0xf2: /* Get ID */
638 switch (client->mode) {
639 case MOUSEDEV_EMUL_PS2:
640 client->ps2[1] = 0;
641 break;
642 case MOUSEDEV_EMUL_IMPS:
643 client->ps2[1] = 3;
644 break;
645 case MOUSEDEV_EMUL_EXPS:
646 client->ps2[1] = 4;
647 break;
648 }
649 client->bufsiz = 2;
650 break;
651
652 case 0xe9: /* Get info */
653 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
654 client->bufsiz = 4;
655 break;
656
657 case 0xff: /* Reset */
658 client->impsseq = client->imexseq = 0;
659 client->mode = MOUSEDEV_EMUL_PS2;
660 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
661 client->bufsiz = 3;
662 break;
663
664 default:
665 client->bufsiz = 1;
666 break;
667 }
668 client->buffer = client->bufsiz;
669 }
670
671 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
672 size_t count, loff_t *ppos)
673 {
674 struct mousedev_client *client = file->private_data;
675 unsigned char c;
676 unsigned int i;
677
678 for (i = 0; i < count; i++) {
679
680 if (get_user(c, buffer + i))
681 return -EFAULT;
682
683 spin_lock_irq(&client->packet_lock);
684
685 if (c == mousedev_imex_seq[client->imexseq]) {
686 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
687 client->imexseq = 0;
688 client->mode = MOUSEDEV_EMUL_EXPS;
689 }
690 } else
691 client->imexseq = 0;
692
693 if (c == mousedev_imps_seq[client->impsseq]) {
694 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
695 client->impsseq = 0;
696 client->mode = MOUSEDEV_EMUL_IMPS;
697 }
698 } else
699 client->impsseq = 0;
700
701 mousedev_generate_response(client, c);
702
703 spin_unlock_irq(&client->packet_lock);
704 }
705
706 kill_fasync(&client->fasync, SIGIO, POLL_IN);
707 wake_up_interruptible(&client->mousedev->wait);
708
709 return count;
710 }
711
712 static ssize_t mousedev_read(struct file *file, char __user *buffer,
713 size_t count, loff_t *ppos)
714 {
715 struct mousedev_client *client = file->private_data;
716 struct mousedev *mousedev = client->mousedev;
717 signed char data[sizeof(client->ps2)];
718 int retval = 0;
719
720 if (!client->ready && !client->buffer && mousedev->exist &&
721 (file->f_flags & O_NONBLOCK))
722 return -EAGAIN;
723
724 retval = wait_event_interruptible(mousedev->wait,
725 !mousedev->exist || client->ready || client->buffer);
726 if (retval)
727 return retval;
728
729 if (!mousedev->exist)
730 return -ENODEV;
731
732 spin_lock_irq(&client->packet_lock);
733
734 if (!client->buffer && client->ready) {
735 mousedev_packet(client, client->ps2);
736 client->buffer = client->bufsiz;
737 }
738
739 if (count > client->buffer)
740 count = client->buffer;
741
742 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
743 client->buffer -= count;
744
745 spin_unlock_irq(&client->packet_lock);
746
747 if (copy_to_user(buffer, data, count))
748 return -EFAULT;
749
750 return count;
751 }
752
753 /* No kernel lock - fine */
754 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
755 {
756 struct mousedev_client *client = file->private_data;
757 struct mousedev *mousedev = client->mousedev;
758 unsigned int mask;
759
760 poll_wait(file, &mousedev->wait, wait);
761
762 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
763 if (client->ready || client->buffer)
764 mask |= POLLIN | POLLRDNORM;
765
766 return mask;
767 }
768
769 static const struct file_operations mousedev_fops = {
770 .owner = THIS_MODULE,
771 .read = mousedev_read,
772 .write = mousedev_write,
773 .poll = mousedev_poll,
774 .open = mousedev_open,
775 .release = mousedev_release,
776 .fasync = mousedev_fasync,
777 .llseek = noop_llseek,
778 };
779
780 /*
781 * Mark device non-existent. This disables writes, ioctls and
782 * prevents new users from opening the device. Already posted
783 * blocking reads will stay, however new ones will fail.
784 */
785 static void mousedev_mark_dead(struct mousedev *mousedev)
786 {
787 mutex_lock(&mousedev->mutex);
788 mousedev->exist = false;
789 mutex_unlock(&mousedev->mutex);
790 }
791
792 /*
793 * Wake up users waiting for IO so they can disconnect from
794 * dead device.
795 */
796 static void mousedev_hangup(struct mousedev *mousedev)
797 {
798 struct mousedev_client *client;
799
800 spin_lock(&mousedev->client_lock);
801 list_for_each_entry(client, &mousedev->client_list, node)
802 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
803 spin_unlock(&mousedev->client_lock);
804
805 wake_up_interruptible(&mousedev->wait);
806 }
807
808 static void mousedev_cleanup(struct mousedev *mousedev)
809 {
810 struct input_handle *handle = &mousedev->handle;
811
812 mousedev_mark_dead(mousedev);
813 mousedev_hangup(mousedev);
814
815 cdev_del(&mousedev->cdev);
816
817 /* mousedev is marked dead so no one else accesses mousedev->open */
818 if (mousedev->open)
819 input_close_device(handle);
820 }
821
822 static int mousedev_reserve_minor(bool mixdev)
823 {
824 int minor;
825
826 if (mixdev) {
827 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false);
828 if (minor < 0)
829 pr_err("failed to reserve mixdev minor: %d\n", minor);
830 } else {
831 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE,
832 MOUSEDEV_MINORS, true);
833 if (minor < 0)
834 pr_err("failed to reserve new minor: %d\n", minor);
835 }
836
837 return minor;
838 }
839
840 static struct mousedev *mousedev_create(struct input_dev *dev,
841 struct input_handler *handler,
842 bool mixdev)
843 {
844 struct mousedev *mousedev;
845 int minor;
846 int error;
847
848 minor = mousedev_reserve_minor(mixdev);
849 if (minor < 0) {
850 error = minor;
851 goto err_out;
852 }
853
854 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
855 if (!mousedev) {
856 error = -ENOMEM;
857 goto err_free_minor;
858 }
859
860 INIT_LIST_HEAD(&mousedev->client_list);
861 INIT_LIST_HEAD(&mousedev->mixdev_node);
862 spin_lock_init(&mousedev->client_lock);
863 mutex_init(&mousedev->mutex);
864 lockdep_set_subclass(&mousedev->mutex,
865 mixdev ? SINGLE_DEPTH_NESTING : 0);
866 init_waitqueue_head(&mousedev->wait);
867
868 if (mixdev) {
869 dev_set_name(&mousedev->dev, "mice");
870
871 mousedev->open_device = mixdev_open_devices;
872 mousedev->close_device = mixdev_close_devices;
873 } else {
874 int dev_no = minor;
875 /* Normalize device number if it falls into legacy range */
876 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
877 dev_no -= MOUSEDEV_MINOR_BASE;
878 dev_set_name(&mousedev->dev, "mouse%d", dev_no);
879
880 mousedev->open_device = mousedev_open_device;
881 mousedev->close_device = mousedev_close_device;
882 }
883
884 mousedev->exist = true;
885 mousedev->handle.dev = input_get_device(dev);
886 mousedev->handle.name = dev_name(&mousedev->dev);
887 mousedev->handle.handler = handler;
888 mousedev->handle.private = mousedev;
889
890 mousedev->dev.class = &input_class;
891 if (dev)
892 mousedev->dev.parent = &dev->dev;
893 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor);
894 mousedev->dev.release = mousedev_free;
895 device_initialize(&mousedev->dev);
896
897 if (!mixdev) {
898 error = input_register_handle(&mousedev->handle);
899 if (error)
900 goto err_free_mousedev;
901 }
902
903 cdev_init(&mousedev->cdev, &mousedev_fops);
904 mousedev->cdev.kobj.parent = &mousedev->dev.kobj;
905 error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1);
906 if (error)
907 goto err_unregister_handle;
908
909 error = device_add(&mousedev->dev);
910 if (error)
911 goto err_cleanup_mousedev;
912
913 return mousedev;
914
915 err_cleanup_mousedev:
916 mousedev_cleanup(mousedev);
917 err_unregister_handle:
918 if (!mixdev)
919 input_unregister_handle(&mousedev->handle);
920 err_free_mousedev:
921 put_device(&mousedev->dev);
922 err_free_minor:
923 input_free_minor(minor);
924 err_out:
925 return ERR_PTR(error);
926 }
927
928 static void mousedev_destroy(struct mousedev *mousedev)
929 {
930 device_del(&mousedev->dev);
931 mousedev_cleanup(mousedev);
932 input_free_minor(MINOR(mousedev->dev.devt));
933 if (mousedev != mousedev_mix)
934 input_unregister_handle(&mousedev->handle);
935 put_device(&mousedev->dev);
936 }
937
938 static int mixdev_add_device(struct mousedev *mousedev)
939 {
940 int retval;
941
942 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
943 if (retval)
944 return retval;
945
946 if (mousedev_mix->open) {
947 retval = mousedev_open_device(mousedev);
948 if (retval)
949 goto out;
950
951 mousedev->opened_by_mixdev = true;
952 }
953
954 get_device(&mousedev->dev);
955 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
956
957 out:
958 mutex_unlock(&mousedev_mix->mutex);
959 return retval;
960 }
961
962 static void mixdev_remove_device(struct mousedev *mousedev)
963 {
964 mutex_lock(&mousedev_mix->mutex);
965
966 if (mousedev->opened_by_mixdev) {
967 mousedev->opened_by_mixdev = false;
968 mousedev_close_device(mousedev);
969 }
970
971 list_del_init(&mousedev->mixdev_node);
972 mutex_unlock(&mousedev_mix->mutex);
973
974 put_device(&mousedev->dev);
975 }
976
977 static int mousedev_connect(struct input_handler *handler,
978 struct input_dev *dev,
979 const struct input_device_id *id)
980 {
981 struct mousedev *mousedev;
982 int error;
983
984 mousedev = mousedev_create(dev, handler, false);
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 .legacy_minors = true,
1061 .minor = MOUSEDEV_MINOR_BASE,
1062 .name = "mousedev",
1063 .id_table = mousedev_ids,
1064 };
1065
1066 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1067 #include <linux/miscdevice.h>
1068
1069 static struct miscdevice psaux_mouse = {
1070 .minor = PSMOUSE_MINOR,
1071 .name = "psaux",
1072 .fops = &mousedev_fops,
1073 };
1074
1075 static bool psaux_registered;
1076
1077 static void __init mousedev_psaux_register(void)
1078 {
1079 int error;
1080
1081 error = misc_register(&psaux_mouse);
1082 if (error)
1083 pr_warn("could not register psaux device, error: %d\n",
1084 error);
1085 else
1086 psaux_registered = true;
1087 }
1088
1089 static void __exit mousedev_psaux_unregister(void)
1090 {
1091 if (psaux_registered)
1092 misc_deregister(&psaux_mouse);
1093 }
1094 #else
1095 static inline void mousedev_psaux_register(void) { }
1096 static inline void mousedev_psaux_unregister(void) { }
1097 #endif
1098
1099 static int __init mousedev_init(void)
1100 {
1101 int error;
1102
1103 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true);
1104 if (IS_ERR(mousedev_mix))
1105 return PTR_ERR(mousedev_mix);
1106
1107 error = input_register_handler(&mousedev_handler);
1108 if (error) {
1109 mousedev_destroy(mousedev_mix);
1110 return error;
1111 }
1112
1113 mousedev_psaux_register();
1114
1115 pr_info("PS/2 mouse device common for all mice\n");
1116
1117 return 0;
1118 }
1119
1120 static void __exit mousedev_exit(void)
1121 {
1122 mousedev_psaux_unregister();
1123 input_unregister_handler(&mousedev_handler);
1124 mousedev_destroy(mousedev_mix);
1125 }
1126
1127 module_init(mousedev_init);
1128 module_exit(mousedev_exit);
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