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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / input / mousedev.c
blob4c842c320c2ede9f2bf42d507ee5c91f00eef7e3
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 bool is_mixdev;
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
82 enum mousedev_emul {
83 MOUSEDEV_EMUL_PS2,
84 MOUSEDEV_EMUL_IMPS,
85 MOUSEDEV_EMUL_EXPS
86 };
87
88 struct mousedev_motion {
89 int dx, dy, dz;
90 unsigned long buttons;
91 };
92
93 #define PACKET_QUEUE_LEN 16
94 struct mousedev_client {
95 struct fasync_struct *fasync;
96 struct mousedev *mousedev;
97 struct list_head node;
98
99 struct mousedev_motion packets[PACKET_QUEUE_LEN];
100 unsigned int head, tail;
101 spinlock_t packet_lock;
102 int pos_x, pos_y;
103
104 signed char ps2[6];
105 unsigned char ready, buffer, bufsiz;
106 unsigned char imexseq, impsseq;
107 enum mousedev_emul mode;
108 unsigned long last_buttons;
109 };
110
111 #define MOUSEDEV_SEQ_LEN 6
112
113 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
114 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
115
116 static struct mousedev *mousedev_mix;
117 static LIST_HEAD(mousedev_mix_list);
118
119 static void mixdev_open_devices(void);
120 static void mixdev_close_devices(void);
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 = client->pos_x < 0 ?
296 0 : (client->pos_x >= xres ? xres : client->pos_x);
297 client->pos_y += packet->dy;
298 client->pos_y = client->pos_y < 0 ?
299 0 : (client->pos_y >= yres ? yres : client->pos_y);
300
301 p->dx += packet->dx;
302 p->dy += packet->dy;
303 p->dz += packet->dz;
304 p->buttons = mousedev->packet.buttons;
305
306 if (p->dx || p->dy || p->dz ||
307 p->buttons != client->last_buttons)
308 client->ready = 1;
309
310 spin_unlock(&client->packet_lock);
311
312 if (client->ready) {
313 kill_fasync(&client->fasync, SIGIO, POLL_IN);
314 wake_readers = 1;
315 }
316 }
317 rcu_read_unlock();
318
319 if (wake_readers)
320 wake_up_interruptible(&mousedev->wait);
321 }
322
323 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
324 {
325 if (!value) {
326 if (mousedev->touch &&
327 time_before(jiffies,
328 mousedev->touch + msecs_to_jiffies(tap_time))) {
329 /*
330 * Toggle left button to emulate tap.
331 * We rely on the fact that mousedev_mix always has 0
332 * motion packet so we won't mess current position.
333 */
334 set_bit(0, &mousedev->packet.buttons);
335 set_bit(0, &mousedev_mix->packet.buttons);
336 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
337 mousedev_notify_readers(mousedev_mix,
338 &mousedev_mix->packet);
339 clear_bit(0, &mousedev->packet.buttons);
340 clear_bit(0, &mousedev_mix->packet.buttons);
341 }
342 mousedev->touch = mousedev->pkt_count = 0;
343 mousedev->frac_dx = 0;
344 mousedev->frac_dy = 0;
345
346 } else if (!mousedev->touch)
347 mousedev->touch = jiffies;
348 }
349
350 static void mousedev_event(struct input_handle *handle,
351 unsigned int type, unsigned int code, int value)
352 {
353 struct mousedev *mousedev = handle->private;
354
355 switch (type) {
356
357 case EV_ABS:
358 /* Ignore joysticks */
359 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
360 return;
361
362 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
363 mousedev_touchpad_event(handle->dev,
364 mousedev, code, value);
365 else
366 mousedev_abs_event(handle->dev, mousedev, code, value);
367
368 break;
369
370 case EV_REL:
371 mousedev_rel_event(mousedev, code, value);
372 break;
373
374 case EV_KEY:
375 if (value != 2) {
376 if (code == BTN_TOUCH &&
377 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
378 mousedev_touchpad_touch(mousedev, value);
379 else
380 mousedev_key_event(mousedev, code, value);
381 }
382 break;
383
384 case EV_SYN:
385 if (code == SYN_REPORT) {
386 if (mousedev->touch) {
387 mousedev->pkt_count++;
388 /*
389 * Input system eats duplicate events,
390 * but we need all of them to do correct
391 * averaging so apply present one forward
392 */
393 fx(0) = fx(1);
394 fy(0) = fy(1);
395 }
396
397 mousedev_notify_readers(mousedev, &mousedev->packet);
398 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
399
400 mousedev->packet.dx = mousedev->packet.dy =
401 mousedev->packet.dz = 0;
402 mousedev->packet.abs_event = 0;
403 }
404 break;
405 }
406 }
407
408 static int mousedev_fasync(int fd, struct file *file, int on)
409 {
410 struct mousedev_client *client = file->private_data;
411
412 return fasync_helper(fd, file, on, &client->fasync);
413 }
414
415 static void mousedev_free(struct device *dev)
416 {
417 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
418
419 input_put_device(mousedev->handle.dev);
420 kfree(mousedev);
421 }
422
423 static int mousedev_open_device(struct mousedev *mousedev)
424 {
425 int retval;
426
427 retval = mutex_lock_interruptible(&mousedev->mutex);
428 if (retval)
429 return retval;
430
431 if (mousedev->is_mixdev)
432 mixdev_open_devices();
433 else if (!mousedev->exist)
434 retval = -ENODEV;
435 else if (!mousedev->open++) {
436 retval = input_open_device(&mousedev->handle);
437 if (retval)
438 mousedev->open--;
439 }
440
441 mutex_unlock(&mousedev->mutex);
442 return retval;
443 }
444
445 static void mousedev_close_device(struct mousedev *mousedev)
446 {
447 mutex_lock(&mousedev->mutex);
448
449 if (mousedev->is_mixdev)
450 mixdev_close_devices();
451 else if (mousedev->exist && !--mousedev->open)
452 input_close_device(&mousedev->handle);
453
454 mutex_unlock(&mousedev->mutex);
455 }
456
457 /*
458 * Open all available devices so they can all be multiplexed in one.
459 * stream. Note that this function is called with mousedev_mix->mutex
460 * held.
461 */
462 static void mixdev_open_devices(void)
463 {
464 struct mousedev *mousedev;
465
466 if (mousedev_mix->open++)
467 return;
468
469 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
470 if (!mousedev->opened_by_mixdev) {
471 if (mousedev_open_device(mousedev))
472 continue;
473
474 mousedev->opened_by_mixdev = true;
475 }
476 }
477 }
478
479 /*
480 * Close all devices that were opened as part of multiplexed
481 * device. Note that this function is called with mousedev_mix->mutex
482 * held.
483 */
484 static void mixdev_close_devices(void)
485 {
486 struct mousedev *mousedev;
487
488 if (--mousedev_mix->open)
489 return;
490
491 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
492 if (mousedev->opened_by_mixdev) {
493 mousedev->opened_by_mixdev = false;
494 mousedev_close_device(mousedev);
495 }
496 }
497 }
498
499
500 static void mousedev_attach_client(struct mousedev *mousedev,
501 struct mousedev_client *client)
502 {
503 spin_lock(&mousedev->client_lock);
504 list_add_tail_rcu(&client->node, &mousedev->client_list);
505 spin_unlock(&mousedev->client_lock);
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_detach_client(mousedev, client);
523 kfree(client);
524
525 mousedev_close_device(mousedev);
526
527 return 0;
528 }
529
530 static int mousedev_open(struct inode *inode, struct file *file)
531 {
532 struct mousedev_client *client;
533 struct mousedev *mousedev;
534 int error;
535
536 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
537 if (imajor(inode) == MISC_MAJOR)
538 mousedev = mousedev_mix;
539 else
540 #endif
541 mousedev = container_of(inode->i_cdev, struct mousedev, cdev);
542
543 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
544 if (!client)
545 return -ENOMEM;
546
547 spin_lock_init(&client->packet_lock);
548 client->pos_x = xres / 2;
549 client->pos_y = yres / 2;
550 client->mousedev = mousedev;
551 mousedev_attach_client(mousedev, client);
552
553 error = mousedev_open_device(mousedev);
554 if (error)
555 goto err_free_client;
556
557 file->private_data = client;
558 nonseekable_open(inode, file);
559
560 return 0;
561
562 err_free_client:
563 mousedev_detach_client(mousedev, client);
564 kfree(client);
565 return error;
566 }
567
568 static inline int mousedev_limit_delta(int delta, int limit)
569 {
570 return delta > limit ? limit : (delta < -limit ? -limit : delta);
571 }
572
573 static void mousedev_packet(struct mousedev_client *client,
574 signed char *ps2_data)
575 {
576 struct mousedev_motion *p = &client->packets[client->tail];
577
578 ps2_data[0] = 0x08 |
579 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
580 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
581 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
582 p->dx -= ps2_data[1];
583 p->dy -= ps2_data[2];
584
585 switch (client->mode) {
586 case MOUSEDEV_EMUL_EXPS:
587 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
588 p->dz -= ps2_data[3];
589 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
590 client->bufsiz = 4;
591 break;
592
593 case MOUSEDEV_EMUL_IMPS:
594 ps2_data[0] |=
595 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
596 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
597 p->dz -= ps2_data[3];
598 client->bufsiz = 4;
599 break;
600
601 case MOUSEDEV_EMUL_PS2:
602 default:
603 ps2_data[0] |=
604 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
605 p->dz = 0;
606 client->bufsiz = 3;
607 break;
608 }
609
610 if (!p->dx && !p->dy && !p->dz) {
611 if (client->tail == client->head) {
612 client->ready = 0;
613 client->last_buttons = p->buttons;
614 } else
615 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
616 }
617 }
618
619 static void mousedev_generate_response(struct mousedev_client *client,
620 int command)
621 {
622 client->ps2[0] = 0xfa; /* ACK */
623
624 switch (command) {
625
626 case 0xeb: /* Poll */
627 mousedev_packet(client, &client->ps2[1]);
628 client->bufsiz++; /* account for leading ACK */
629 break;
630
631 case 0xf2: /* Get ID */
632 switch (client->mode) {
633 case MOUSEDEV_EMUL_PS2:
634 client->ps2[1] = 0;
635 break;
636 case MOUSEDEV_EMUL_IMPS:
637 client->ps2[1] = 3;
638 break;
639 case MOUSEDEV_EMUL_EXPS:
640 client->ps2[1] = 4;
641 break;
642 }
643 client->bufsiz = 2;
644 break;
645
646 case 0xe9: /* Get info */
647 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
648 client->bufsiz = 4;
649 break;
650
651 case 0xff: /* Reset */
652 client->impsseq = client->imexseq = 0;
653 client->mode = MOUSEDEV_EMUL_PS2;
654 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
655 client->bufsiz = 3;
656 break;
657
658 default:
659 client->bufsiz = 1;
660 break;
661 }
662 client->buffer = client->bufsiz;
663 }
664
665 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
666 size_t count, loff_t *ppos)
667 {
668 struct mousedev_client *client = file->private_data;
669 unsigned char c;
670 unsigned int i;
671
672 for (i = 0; i < count; i++) {
673
674 if (get_user(c, buffer + i))
675 return -EFAULT;
676
677 spin_lock_irq(&client->packet_lock);
678
679 if (c == mousedev_imex_seq[client->imexseq]) {
680 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
681 client->imexseq = 0;
682 client->mode = MOUSEDEV_EMUL_EXPS;
683 }
684 } else
685 client->imexseq = 0;
686
687 if (c == mousedev_imps_seq[client->impsseq]) {
688 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
689 client->impsseq = 0;
690 client->mode = MOUSEDEV_EMUL_IMPS;
691 }
692 } else
693 client->impsseq = 0;
694
695 mousedev_generate_response(client, c);
696
697 spin_unlock_irq(&client->packet_lock);
698 }
699
700 kill_fasync(&client->fasync, SIGIO, POLL_IN);
701 wake_up_interruptible(&client->mousedev->wait);
702
703 return count;
704 }
705
706 static ssize_t mousedev_read(struct file *file, char __user *buffer,
707 size_t count, loff_t *ppos)
708 {
709 struct mousedev_client *client = file->private_data;
710 struct mousedev *mousedev = client->mousedev;
711 signed char data[sizeof(client->ps2)];
712 int retval = 0;
713
714 if (!client->ready && !client->buffer && mousedev->exist &&
715 (file->f_flags & O_NONBLOCK))
716 return -EAGAIN;
717
718 retval = wait_event_interruptible(mousedev->wait,
719 !mousedev->exist || client->ready || client->buffer);
720 if (retval)
721 return retval;
722
723 if (!mousedev->exist)
724 return -ENODEV;
725
726 spin_lock_irq(&client->packet_lock);
727
728 if (!client->buffer && client->ready) {
729 mousedev_packet(client, client->ps2);
730 client->buffer = client->bufsiz;
731 }
732
733 if (count > client->buffer)
734 count = client->buffer;
735
736 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
737 client->buffer -= count;
738
739 spin_unlock_irq(&client->packet_lock);
740
741 if (copy_to_user(buffer, data, count))
742 return -EFAULT;
743
744 return count;
745 }
746
747 /* No kernel lock - fine */
748 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
749 {
750 struct mousedev_client *client = file->private_data;
751 struct mousedev *mousedev = client->mousedev;
752 unsigned int mask;
753
754 poll_wait(file, &mousedev->wait, wait);
755
756 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
757 if (client->ready || client->buffer)
758 mask |= POLLIN | POLLRDNORM;
759
760 return mask;
761 }
762
763 static const struct file_operations mousedev_fops = {
764 .owner = THIS_MODULE,
765 .read = mousedev_read,
766 .write = mousedev_write,
767 .poll = mousedev_poll,
768 .open = mousedev_open,
769 .release = mousedev_release,
770 .fasync = mousedev_fasync,
771 .llseek = noop_llseek,
772 };
773
774 /*
775 * Mark device non-existent. This disables writes, ioctls and
776 * prevents new users from opening the device. Already posted
777 * blocking reads will stay, however new ones will fail.
778 */
779 static void mousedev_mark_dead(struct mousedev *mousedev)
780 {
781 mutex_lock(&mousedev->mutex);
782 mousedev->exist = false;
783 mutex_unlock(&mousedev->mutex);
784 }
785
786 /*
787 * Wake up users waiting for IO so they can disconnect from
788 * dead device.
789 */
790 static void mousedev_hangup(struct mousedev *mousedev)
791 {
792 struct mousedev_client *client;
793
794 spin_lock(&mousedev->client_lock);
795 list_for_each_entry(client, &mousedev->client_list, node)
796 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
797 spin_unlock(&mousedev->client_lock);
798
799 wake_up_interruptible(&mousedev->wait);
800 }
801
802 static void mousedev_cleanup(struct mousedev *mousedev)
803 {
804 struct input_handle *handle = &mousedev->handle;
805
806 mousedev_mark_dead(mousedev);
807 mousedev_hangup(mousedev);
808
809 cdev_del(&mousedev->cdev);
810
811 /* mousedev is marked dead so no one else accesses mousedev->open */
812 if (mousedev->open)
813 input_close_device(handle);
814 }
815
816 static int mousedev_reserve_minor(bool mixdev)
817 {
818 int minor;
819
820 if (mixdev) {
821 minor = input_get_new_minor(MOUSEDEV_MIX, 1, false);
822 if (minor < 0)
823 pr_err("failed to reserve mixdev minor: %d\n", minor);
824 } else {
825 minor = input_get_new_minor(MOUSEDEV_MINOR_BASE,
826 MOUSEDEV_MINORS, true);
827 if (minor < 0)
828 pr_err("failed to reserve new minor: %d\n", minor);
829 }
830
831 return minor;
832 }
833
834 static struct mousedev *mousedev_create(struct input_dev *dev,
835 struct input_handler *handler,
836 bool mixdev)
837 {
838 struct mousedev *mousedev;
839 int minor;
840 int error;
841
842 minor = mousedev_reserve_minor(mixdev);
843 if (minor < 0) {
844 error = minor;
845 goto err_out;
846 }
847
848 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
849 if (!mousedev) {
850 error = -ENOMEM;
851 goto err_free_minor;
852 }
853
854 INIT_LIST_HEAD(&mousedev->client_list);
855 INIT_LIST_HEAD(&mousedev->mixdev_node);
856 spin_lock_init(&mousedev->client_lock);
857 mutex_init(&mousedev->mutex);
858 lockdep_set_subclass(&mousedev->mutex,
859 mixdev ? SINGLE_DEPTH_NESTING : 0);
860 init_waitqueue_head(&mousedev->wait);
861
862 if (mixdev) {
863 dev_set_name(&mousedev->dev, "mice");
864 } else {
865 int dev_no = minor;
866 /* Normalize device number if it falls into legacy range */
867 if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
868 dev_no -= MOUSEDEV_MINOR_BASE;
869 dev_set_name(&mousedev->dev, "mouse%d", dev_no);
870 }
871
872 mousedev->exist = true;
873 mousedev->is_mixdev = mixdev;
874 mousedev->handle.dev = input_get_device(dev);
875 mousedev->handle.name = dev_name(&mousedev->dev);
876 mousedev->handle.handler = handler;
877 mousedev->handle.private = mousedev;
878
879 mousedev->dev.class = &input_class;
880 if (dev)
881 mousedev->dev.parent = &dev->dev;
882 mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor);
883 mousedev->dev.release = mousedev_free;
884 device_initialize(&mousedev->dev);
885
886 if (!mixdev) {
887 error = input_register_handle(&mousedev->handle);
888 if (error)
889 goto err_free_mousedev;
890 }
891
892 cdev_init(&mousedev->cdev, &mousedev_fops);
893 mousedev->cdev.kobj.parent = &mousedev->dev.kobj;
894 error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1);
895 if (error)
896 goto err_unregister_handle;
897
898 error = device_add(&mousedev->dev);
899 if (error)
900 goto err_cleanup_mousedev;
901
902 return mousedev;
903
904 err_cleanup_mousedev:
905 mousedev_cleanup(mousedev);
906 err_unregister_handle:
907 if (!mixdev)
908 input_unregister_handle(&mousedev->handle);
909 err_free_mousedev:
910 put_device(&mousedev->dev);
911 err_free_minor:
912 input_free_minor(minor);
913 err_out:
914 return ERR_PTR(error);
915 }
916
917 static void mousedev_destroy(struct mousedev *mousedev)
918 {
919 device_del(&mousedev->dev);
920 mousedev_cleanup(mousedev);
921 input_free_minor(MINOR(mousedev->dev.devt));
922 if (!mousedev->is_mixdev)
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->opened_by_mixdev = true;
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->opened_by_mixdev) {
956 mousedev->opened_by_mixdev = false;
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 error;
972
973 mousedev = mousedev_create(dev, handler, false);
974 if (IS_ERR(mousedev))
975 return PTR_ERR(mousedev);
976
977 error = mixdev_add_device(mousedev);
978 if (error) {
979 mousedev_destroy(mousedev);
980 return error;
981 }
982
983 return 0;
984 }
985
986 static void mousedev_disconnect(struct input_handle *handle)
987 {
988 struct mousedev *mousedev = handle->private;
989
990 mixdev_remove_device(mousedev);
991 mousedev_destroy(mousedev);
992 }
993
994 static const struct input_device_id mousedev_ids[] = {
995 {
996 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
997 INPUT_DEVICE_ID_MATCH_KEYBIT |
998 INPUT_DEVICE_ID_MATCH_RELBIT,
999 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1000 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1001 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
1002 }, /* A mouse like device, at least one button,
1003 two relative axes */
1004 {
1005 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1006 INPUT_DEVICE_ID_MATCH_RELBIT,
1007 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1008 .relbit = { BIT_MASK(REL_WHEEL) },
1009 }, /* A separate scrollwheel */
1010 {
1011 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1012 INPUT_DEVICE_ID_MATCH_KEYBIT |
1013 INPUT_DEVICE_ID_MATCH_ABSBIT,
1014 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1015 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1016 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1017 }, /* A tablet like device, at least touch detection,
1018 two absolute axes */
1019 {
1020 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1021 INPUT_DEVICE_ID_MATCH_KEYBIT |
1022 INPUT_DEVICE_ID_MATCH_ABSBIT,
1023 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1024 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1025 BIT_MASK(BTN_TOOL_FINGER) },
1026 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1027 BIT_MASK(ABS_PRESSURE) |
1028 BIT_MASK(ABS_TOOL_WIDTH) },
1029 }, /* A touchpad */
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_LEFT)] = BIT_MASK(BTN_LEFT) },
1036 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1037 }, /* Mouse-like device with absolute X and Y but ordinary
1038 clicks, like hp ILO2 High Performance mouse */
1039
1040 { }, /* Terminating entry */
1041 };
1042
1043 MODULE_DEVICE_TABLE(input, mousedev_ids);
1044
1045 static struct input_handler mousedev_handler = {
1046 .event = mousedev_event,
1047 .connect = mousedev_connect,
1048 .disconnect = mousedev_disconnect,
1049 .legacy_minors = true,
1050 .minor = MOUSEDEV_MINOR_BASE,
1051 .name = "mousedev",
1052 .id_table = mousedev_ids,
1053 };
1054
1055 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1056 #include <linux/miscdevice.h>
1057
1058 static struct miscdevice psaux_mouse = {
1059 .minor = PSMOUSE_MINOR,
1060 .name = "psaux",
1061 .fops = &mousedev_fops,
1062 };
1063
1064 static bool psaux_registered;
1065
1066 static void __init mousedev_psaux_register(void)
1067 {
1068 int error;
1069
1070 error = misc_register(&psaux_mouse);
1071 if (error)
1072 pr_warn("could not register psaux device, error: %d\n",
1073 error);
1074 else
1075 psaux_registered = true;
1076 }
1077
1078 static void __exit mousedev_psaux_unregister(void)
1079 {
1080 if (psaux_registered)
1081 misc_deregister(&psaux_mouse);
1082 }
1083 #else
1084 static inline void mousedev_psaux_register(void) { }
1085 static inline void mousedev_psaux_unregister(void) { }
1086 #endif
1087
1088 static int __init mousedev_init(void)
1089 {
1090 int error;
1091
1092 mousedev_mix = mousedev_create(NULL, &mousedev_handler, true);
1093 if (IS_ERR(mousedev_mix))
1094 return PTR_ERR(mousedev_mix);
1095
1096 error = input_register_handler(&mousedev_handler);
1097 if (error) {
1098 mousedev_destroy(mousedev_mix);
1099 return error;
1100 }
1101
1102 mousedev_psaux_register();
1103
1104 pr_info("PS/2 mouse device common for all mice\n");
1105
1106 return 0;
1107 }
1108
1109 static void __exit mousedev_exit(void)
1110 {
1111 mousedev_psaux_unregister();
1112 input_unregister_handler(&mousedev_handler);
1113 mousedev_destroy(mousedev_mix);
1114 }
1115
1116 module_init(mousedev_init);
1117 module_exit(mousedev_exit);
Linux with added FPC-III support