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kvm: x86: Introduce kvm_mmu_calc_root_page_role()
[linux/fpc-iii.git] / drivers / input / mousedev.c
blobe08228061bcdd2f97aaadece31d6c83eb7539ae5
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/bitops.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/poll.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/input.h>
25 #include <linux/random.h>
26 #include <linux/major.h>
27 #include <linux/device.h>
28 #include <linux/cdev.h>
29 #include <linux/kernel.h>
30
31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
32 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
33 MODULE_LICENSE("GPL");
34
35 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
36 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
37 #endif
38 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
39 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
40 #endif
41
42 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
43 module_param(xres, uint, 0644);
44 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
45
46 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
47 module_param(yres, uint, 0644);
48 MODULE_PARM_DESC(yres, "Vertical screen resolution");
49
50 static unsigned tap_time = 200;
51 module_param(tap_time, uint, 0644);
52 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
53
54 struct mousedev_hw_data {
55 int dx, dy, dz;
56 int x, y;
57 int abs_event;
58 unsigned long buttons;
59 };
60
61 struct mousedev {
62 int open;
63 struct input_handle handle;
64 wait_queue_head_t wait;
65 struct list_head client_list;
66 spinlock_t client_lock; /* protects client_list */
67 struct mutex mutex;
68 struct device dev;
69 struct cdev cdev;
70 bool exist;
71
72 struct list_head mixdev_node;
73 bool opened_by_mixdev;
74
75 struct mousedev_hw_data packet;
76 unsigned int pkt_count;
77 int old_x[4], old_y[4];
78 int frac_dx, frac_dy;
79 unsigned long touch;
80
81 int (*open_device)(struct mousedev *mousedev);
82 void (*close_device)(struct mousedev *mousedev);
83 };
84
85 enum mousedev_emul {
86 MOUSEDEV_EMUL_PS2,
87 MOUSEDEV_EMUL_IMPS,
88 MOUSEDEV_EMUL_EXPS
89 };
90
91 struct mousedev_motion {
92 int dx, dy, dz;
93 unsigned long buttons;
94 };
95
96 #define PACKET_QUEUE_LEN 16
97 struct mousedev_client {
98 struct fasync_struct *fasync;
99 struct mousedev *mousedev;
100 struct list_head node;
101
102 struct mousedev_motion packets[PACKET_QUEUE_LEN];
103 unsigned int head, tail;
104 spinlock_t packet_lock;
105 int pos_x, pos_y;
106
107 u8 ps2[6];
108 unsigned char ready, buffer, bufsiz;
109 unsigned char imexseq, impsseq;
110 enum mousedev_emul mode;
111 unsigned long last_buttons;
112 };
113
114 #define MOUSEDEV_SEQ_LEN 6
115
116 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
117 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
118
119 static struct mousedev *mousedev_mix;
120 static LIST_HEAD(mousedev_mix_list);
121
122 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
123 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
124
125 static void mousedev_touchpad_event(struct input_dev *dev,
126 struct mousedev *mousedev,
127 unsigned int code, int value)
128 {
129 int size, tmp;
130 enum { FRACTION_DENOM = 128 };
131
132 switch (code) {
133
134 case ABS_X:
135
136 fx(0) = value;
137 if (mousedev->touch && mousedev->pkt_count >= 2) {
138 size = input_abs_get_max(dev, ABS_X) -
139 input_abs_get_min(dev, ABS_X);
140 if (size == 0)
141 size = 256 * 2;
142
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 for ABS_Y to keep the same scale */
155 size = input_abs_get_max(dev, ABS_X) -
156 input_abs_get_min(dev, ABS_X);
157 if (size == 0)
158 size = 256 * 2;
159
160 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
161 tmp += mousedev->frac_dy;
162 mousedev->packet.dy = tmp / FRACTION_DENOM;
163 mousedev->frac_dy = tmp -
164 mousedev->packet.dy * FRACTION_DENOM;
165 }
166 break;
167 }
168 }
169
170 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
171 unsigned int code, int value)
172 {
173 int min, max, size;
174
175 switch (code) {
176
177 case ABS_X:
178 min = input_abs_get_min(dev, ABS_X);
179 max = input_abs_get_max(dev, ABS_X);
180
181 size = max - min;
182 if (size == 0)
183 size = xres ? : 1;
184
185 value = clamp(value, min, max);
186
187 mousedev->packet.x = ((value - min) * xres) / size;
188 mousedev->packet.abs_event = 1;
189 break;
190
191 case ABS_Y:
192 min = input_abs_get_min(dev, ABS_Y);
193 max = input_abs_get_max(dev, ABS_Y);
194
195 size = max - min;
196 if (size == 0)
197 size = yres ? : 1;
198
199 value = clamp(value, min, max);
200
201 mousedev->packet.y = yres - ((value - min) * yres) / size;
202 mousedev->packet.abs_event = 1;
203 break;
204 }
205 }
206
207 static void mousedev_rel_event(struct mousedev *mousedev,
208 unsigned int code, int value)
209 {
210 switch (code) {
211 case REL_X:
212 mousedev->packet.dx += value;
213 break;
214
215 case REL_Y:
216 mousedev->packet.dy -= value;
217 break;
218
219 case REL_WHEEL:
220 mousedev->packet.dz -= value;
221 break;
222 }
223 }
224
225 static void mousedev_key_event(struct mousedev *mousedev,
226 unsigned int code, int value)
227 {
228 int index;
229
230 switch (code) {
231
232 case BTN_TOUCH:
233 case BTN_0:
234 case BTN_LEFT: index = 0; break;
235
236 case BTN_STYLUS:
237 case BTN_1:
238 case BTN_RIGHT: index = 1; break;
239
240 case BTN_2:
241 case BTN_FORWARD:
242 case BTN_STYLUS2:
243 case BTN_MIDDLE: index = 2; break;
244
245 case BTN_3:
246 case BTN_BACK:
247 case BTN_SIDE: index = 3; break;
248
249 case BTN_4:
250 case BTN_EXTRA: index = 4; break;
251
252 default: return;
253 }
254
255 if (value) {
256 set_bit(index, &mousedev->packet.buttons);
257 set_bit(index, &mousedev_mix->packet.buttons);
258 } else {
259 clear_bit(index, &mousedev->packet.buttons);
260 clear_bit(index, &mousedev_mix->packet.buttons);
261 }
262 }
263
264 static void mousedev_notify_readers(struct mousedev *mousedev,
265 struct mousedev_hw_data *packet)
266 {
267 struct mousedev_client *client;
268 struct mousedev_motion *p;
269 unsigned int new_head;
270 int wake_readers = 0;
271
272 rcu_read_lock();
273 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
274
275 /* Just acquire the lock, interrupts already disabled */
276 spin_lock(&client->packet_lock);
277
278 p = &client->packets[client->head];
279 if (client->ready && p->buttons != mousedev->packet.buttons) {
280 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
281 if (new_head != client->tail) {
282 p = &client->packets[client->head = new_head];
283 memset(p, 0, sizeof(struct mousedev_motion));
284 }
285 }
286
287 if (packet->abs_event) {
288 p->dx += packet->x - client->pos_x;
289 p->dy += packet->y - client->pos_y;
290 client->pos_x = packet->x;
291 client->pos_y = packet->y;
292 }
293
294 client->pos_x += packet->dx;
295 client->pos_x = clamp_val(client->pos_x, 0, xres);
296
297 client->pos_y += packet->dy;
298 client->pos_y = clamp_val(client->pos_y, 0, yres);
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 void mousedev_packet(struct mousedev_client *client, u8 *ps2_data)
575 {
576 struct mousedev_motion *p = &client->packets[client->tail];
577 s8 dx, dy, dz;
578
579 dx = clamp_val(p->dx, -127, 127);
580 p->dx -= dx;
581
582 dy = clamp_val(p->dy, -127, 127);
583 p->dy -= dy;
584
585 ps2_data[0] = BIT(3);
586 ps2_data[0] |= ((dx & BIT(7)) >> 3) | ((dy & BIT(7)) >> 2);
587 ps2_data[0] |= p->buttons & 0x07;
588 ps2_data[1] = dx;
589 ps2_data[2] = dy;
590
591 switch (client->mode) {
592 case MOUSEDEV_EMUL_EXPS:
593 dz = clamp_val(p->dz, -7, 7);
594 p->dz -= dz;
595
596 ps2_data[3] = (dz & 0x0f) | ((p->buttons & 0x18) << 1);
597 client->bufsiz = 4;
598 break;
599
600 case MOUSEDEV_EMUL_IMPS:
601 dz = clamp_val(p->dz, -127, 127);
602 p->dz -= dz;
603
604 ps2_data[0] |= ((p->buttons & 0x10) >> 3) |
605 ((p->buttons & 0x08) >> 1);
606 ps2_data[3] = dz;
607
608 client->bufsiz = 4;
609 break;
610
611 case MOUSEDEV_EMUL_PS2:
612 default:
613 p->dz = 0;
614
615 ps2_data[0] |= ((p->buttons & 0x10) >> 3) |
616 ((p->buttons & 0x08) >> 1);
617
618 client->bufsiz = 3;
619 break;
620 }
621
622 if (!p->dx && !p->dy && !p->dz) {
623 if (client->tail == client->head) {
624 client->ready = 0;
625 client->last_buttons = p->buttons;
626 } else
627 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
628 }
629 }
630
631 static void mousedev_generate_response(struct mousedev_client *client,
632 int command)
633 {
634 client->ps2[0] = 0xfa; /* ACK */
635
636 switch (command) {
637
638 case 0xeb: /* Poll */
639 mousedev_packet(client, &client->ps2[1]);
640 client->bufsiz++; /* account for leading ACK */
641 break;
642
643 case 0xf2: /* Get ID */
644 switch (client->mode) {
645 case MOUSEDEV_EMUL_PS2:
646 client->ps2[1] = 0;
647 break;
648 case MOUSEDEV_EMUL_IMPS:
649 client->ps2[1] = 3;
650 break;
651 case MOUSEDEV_EMUL_EXPS:
652 client->ps2[1] = 4;
653 break;
654 }
655 client->bufsiz = 2;
656 break;
657
658 case 0xe9: /* Get info */
659 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
660 client->bufsiz = 4;
661 break;
662
663 case 0xff: /* Reset */
664 client->impsseq = client->imexseq = 0;
665 client->mode = MOUSEDEV_EMUL_PS2;
666 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
667 client->bufsiz = 3;
668 break;
669
670 default:
671 client->bufsiz = 1;
672 break;
673 }
674 client->buffer = client->bufsiz;
675 }
676
677 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
678 size_t count, loff_t *ppos)
679 {
680 struct mousedev_client *client = file->private_data;
681 unsigned char c;
682 unsigned int i;
683
684 for (i = 0; i < count; i++) {
685
686 if (get_user(c, buffer + i))
687 return -EFAULT;
688
689 spin_lock_irq(&client->packet_lock);
690
691 if (c == mousedev_imex_seq[client->imexseq]) {
692 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
693 client->imexseq = 0;
694 client->mode = MOUSEDEV_EMUL_EXPS;
695 }
696 } else
697 client->imexseq = 0;
698
699 if (c == mousedev_imps_seq[client->impsseq]) {
700 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
701 client->impsseq = 0;
702 client->mode = MOUSEDEV_EMUL_IMPS;
703 }
704 } else
705 client->impsseq = 0;
706
707 mousedev_generate_response(client, c);
708
709 spin_unlock_irq(&client->packet_lock);
710 }
711
712 kill_fasync(&client->fasync, SIGIO, POLL_IN);
713 wake_up_interruptible(&client->mousedev->wait);
714
715 return count;
716 }
717
718 static ssize_t mousedev_read(struct file *file, char __user *buffer,
719 size_t count, loff_t *ppos)
720 {
721 struct mousedev_client *client = file->private_data;
722 struct mousedev *mousedev = client->mousedev;
723 u8 data[sizeof(client->ps2)];
724 int retval = 0;
725
726 if (!client->ready && !client->buffer && mousedev->exist &&
727 (file->f_flags & O_NONBLOCK))
728 return -EAGAIN;
729
730 retval = wait_event_interruptible(mousedev->wait,
731 !mousedev->exist || client->ready || client->buffer);
732 if (retval)
733 return retval;
734
735 if (!mousedev->exist)
736 return -ENODEV;
737
738 spin_lock_irq(&client->packet_lock);
739
740 if (!client->buffer && client->ready) {
741 mousedev_packet(client, client->ps2);
742 client->buffer = client->bufsiz;
743 }
744
745 if (count > client->buffer)
746 count = client->buffer;
747
748 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
749 client->buffer -= count;
750
751 spin_unlock_irq(&client->packet_lock);
752
753 if (copy_to_user(buffer, data, count))
754 return -EFAULT;
755
756 return count;
757 }
758
759 /* No kernel lock - fine */
760 static __poll_t mousedev_poll(struct file *file, poll_table *wait)
761 {
762 struct mousedev_client *client = file->private_data;
763 struct mousedev *mousedev = client->mousedev;
764 __poll_t mask;
765
766 poll_wait(file, &mousedev->wait, wait);
767
768 mask = mousedev->exist ? EPOLLOUT | EPOLLWRNORM : EPOLLHUP | EPOLLERR;
769 if (client->ready || client->buffer)
770 mask |= EPOLLIN | EPOLLRDNORM;
771
772 return mask;
773 }
774
775 static const struct file_operations mousedev_fops = {
776 .owner = THIS_MODULE,
777 .read = mousedev_read,
778 .write = mousedev_write,
779 .poll = mousedev_poll,
780 .open = mousedev_open,
781 .release = mousedev_release,
782 .fasync = mousedev_fasync,
783 .llseek = noop_llseek,
784 };
785
786 /*
787 * Mark device non-existent. This disables writes, ioctls and
788 * prevents new users from opening the device. Already posted
789 * blocking reads will stay, however new ones will fail.
790 */
791 static void mousedev_mark_dead(struct mousedev *mousedev)
792 {
793 mutex_lock(&mousedev->mutex);
794 mousedev->exist = false;
795 mutex_unlock(&mousedev->mutex);
796 }
797
798 /*
799 * Wake up users waiting for IO so they can disconnect from
800 * dead device.
801 */
802 static void mousedev_hangup(struct mousedev *mousedev)
803 {
804 struct mousedev_client *client;
805
806 spin_lock(&mousedev->client_lock);
807 list_for_each_entry(client, &mousedev->client_list, node)
808 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
809 spin_unlock(&mousedev->client_lock);
810
811 wake_up_interruptible(&mousedev->wait);
812 }
813
814 static void mousedev_cleanup(struct mousedev *mousedev)
815 {
816 struct input_handle *handle = &mousedev->handle;
817
818 mousedev_mark_dead(mousedev);
819 mousedev_hangup(mousedev);
820
821 /* mousedev is marked dead so no one else accesses mousedev->open */
822 if (mousedev->open)
823 input_close_device(handle);
824 }
825
826 static int mousedev_reserve_minor(bool mixdev)
827 {
828 int minor;
829
830 if (mixdev) {
831 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false);
832 if (minor < 0)
833 pr_err("failed to reserve mixdev minor: %d\n", minor);
834 } else {
835 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE,
836 MOUSEDEV_MINORS, true);
837 if (minor < 0)
838 pr_err("failed to reserve new minor: %d\n", minor);
839 }
840
841 return minor;
842 }
843
844 static struct mousedev *mousedev_create(struct input_dev *dev,
845 struct input_handler *handler,
846 bool mixdev)
847 {
848 struct mousedev *mousedev;
849 int minor;
850 int error;
851
852 minor = mousedev_reserve_minor(mixdev);
853 if (minor < 0) {
854 error = minor;
855 goto err_out;
856 }
857
858 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
859 if (!mousedev) {
860 error = -ENOMEM;
861 goto err_free_minor;
862 }
863
864 INIT_LIST_HEAD(&mousedev->client_list);
865 INIT_LIST_HEAD(&mousedev->mixdev_node);
866 spin_lock_init(&mousedev->client_lock);
867 mutex_init(&mousedev->mutex);
868 lockdep_set_subclass(&mousedev->mutex,
869 mixdev ? SINGLE_DEPTH_NESTING : 0);
870 init_waitqueue_head(&mousedev->wait);
871
872 if (mixdev) {
873 dev_set_name(&mousedev->dev, "mice");
874
875 mousedev->open_device = mixdev_open_devices;
876 mousedev->close_device = mixdev_close_devices;
877 } else {
878 int dev_no = minor;
879 /* Normalize device number if it falls into legacy range */
880 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
881 dev_no -= MOUSEDEV_MINOR_BASE;
882 dev_set_name(&mousedev->dev, "mouse%d", dev_no);
883
884 mousedev->open_device = mousedev_open_device;
885 mousedev->close_device = mousedev_close_device;
886 }
887
888 mousedev->exist = true;
889 mousedev->handle.dev = input_get_device(dev);
890 mousedev->handle.name = dev_name(&mousedev->dev);
891 mousedev->handle.handler = handler;
892 mousedev->handle.private = mousedev;
893
894 mousedev->dev.class = &input_class;
895 if (dev)
896 mousedev->dev.parent = &dev->dev;
897 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor);
898 mousedev->dev.release = mousedev_free;
899 device_initialize(&mousedev->dev);
900
901 if (!mixdev) {
902 error = input_register_handle(&mousedev->handle);
903 if (error)
904 goto err_free_mousedev;
905 }
906
907 cdev_init(&mousedev->cdev, &mousedev_fops);
908
909 error = cdev_device_add(&mousedev->cdev, &mousedev->dev);
910 if (error)
911 goto err_cleanup_mousedev;
912
913 return mousedev;
914
915 err_cleanup_mousedev:
916 mousedev_cleanup(mousedev);
917 if (!mixdev)
918 input_unregister_handle(&mousedev->handle);
919 err_free_mousedev:
920 put_device(&mousedev->dev);
921 err_free_minor:
922 input_free_minor(minor);
923 err_out:
924 return ERR_PTR(error);
925 }
926
927 static void mousedev_destroy(struct mousedev *mousedev)
928 {
929 cdev_device_del(&mousedev->cdev, &mousedev->dev);
930 mousedev_cleanup(mousedev);
931 input_free_minor(MINOR(mousedev->dev.devt));
932 if (mousedev != mousedev_mix)
933 input_unregister_handle(&mousedev->handle);
934 put_device(&mousedev->dev);
935 }
936
937 static int mixdev_add_device(struct mousedev *mousedev)
938 {
939 int retval;
940
941 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
942 if (retval)
943 return retval;
944
945 if (mousedev_mix->open) {
946 retval = mousedev_open_device(mousedev);
947 if (retval)
948 goto out;
949
950 mousedev->opened_by_mixdev = true;
951 }
952
953 get_device(&mousedev->dev);
954 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
955
956 out:
957 mutex_unlock(&mousedev_mix->mutex);
958 return retval;
959 }
960
961 static void mixdev_remove_device(struct mousedev *mousedev)
962 {
963 mutex_lock(&mousedev_mix->mutex);
964
965 if (mousedev->opened_by_mixdev) {
966 mousedev->opened_by_mixdev = false;
967 mousedev_close_device(mousedev);
968 }
969
970 list_del_init(&mousedev->mixdev_node);
971 mutex_unlock(&mousedev_mix->mutex);
972
973 put_device(&mousedev->dev);
974 }
975
976 static int mousedev_connect(struct input_handler *handler,
977 struct input_dev *dev,
978 const struct input_device_id *id)
979 {
980 struct mousedev *mousedev;
981 int error;
982
983 mousedev = mousedev_create(dev, handler, false);
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 .legacy_minors = true,
1060 .minor = MOUSEDEV_MINOR_BASE,
1061 .name = "mousedev",
1062 .id_table = mousedev_ids,
1063 };
1064
1065 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1066 #include <linux/miscdevice.h>
1067
1068 static struct miscdevice psaux_mouse = {
1069 .minor = PSMOUSE_MINOR,
1070 .name = "psaux",
1071 .fops = &mousedev_fops,
1072 };
1073
1074 static bool psaux_registered;
1075
1076 static void __init mousedev_psaux_register(void)
1077 {
1078 int error;
1079
1080 error = misc_register(&psaux_mouse);
1081 if (error)
1082 pr_warn("could not register psaux device, error: %d\n",
1083 error);
1084 else
1085 psaux_registered = true;
1086 }
1087
1088 static void __exit mousedev_psaux_unregister(void)
1089 {
1090 if (psaux_registered)
1091 misc_deregister(&psaux_mouse);
1092 }
1093 #else
1094 static inline void mousedev_psaux_register(void) { }
1095 static inline void mousedev_psaux_unregister(void) { }
1096 #endif
1097
1098 static int __init mousedev_init(void)
1099 {
1100 int error;
1101
1102 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true);
1103 if (IS_ERR(mousedev_mix))
1104 return PTR_ERR(mousedev_mix);
1105
1106 error = input_register_handler(&mousedev_handler);
1107 if (error) {
1108 mousedev_destroy(mousedev_mix);
1109 return error;
1110 }
1111
1112 mousedev_psaux_register();
1113
1114 pr_info("PS/2 mouse device common for all mice\n");
1115
1116 return 0;
1117 }
1118
1119 static void __exit mousedev_exit(void)
1120 {
1121 mousedev_psaux_unregister();
1122 input_unregister_handler(&mousedev_handler);
1123 mousedev_destroy(mousedev_mix);
1124 }
1125
1126 module_init(mousedev_init);
1127 module_exit(mousedev_exit);
Linux with added FPC-III support