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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / input / mousedev.c
blobd528a2dba06418eb5e80097552463e9abec5db05
1 /*
2 * Input driver to ExplorerPS/2 device driver module.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
12 #define MOUSEDEV_MINOR_BASE 32
13 #define MOUSEDEV_MINORS 32
14 #define MOUSEDEV_MIX 31
15
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/poll.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/input.h>
22 #include <linux/random.h>
23 #include <linux/major.h>
24 #include <linux/device.h>
25 #include <linux/kernel.h>
26 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
27 #include <linux/miscdevice.h>
28 #endif
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 int minor;
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 bool exist;
70
71 struct list_head mixdev_node;
72 int mixdev_open;
73
74 struct mousedev_hw_data packet;
75 unsigned int pkt_count;
76 int old_x[4], old_y[4];
77 int frac_dx, frac_dy;
78 unsigned long touch;
79 };
80
81 enum mousedev_emul {
82 MOUSEDEV_EMUL_PS2,
83 MOUSEDEV_EMUL_IMPS,
84 MOUSEDEV_EMUL_EXPS
85 };
86
87 struct mousedev_motion {
88 int dx, dy, dz;
89 unsigned long buttons;
90 };
91
92 #define PACKET_QUEUE_LEN 16
93 struct mousedev_client {
94 struct fasync_struct *fasync;
95 struct mousedev *mousedev;
96 struct list_head node;
97
98 struct mousedev_motion packets[PACKET_QUEUE_LEN];
99 unsigned int head, tail;
100 spinlock_t packet_lock;
101 int pos_x, pos_y;
102
103 signed char ps2[6];
104 unsigned char ready, buffer, bufsiz;
105 unsigned char imexseq, impsseq;
106 enum mousedev_emul mode;
107 unsigned long last_buttons;
108 };
109
110 #define MOUSEDEV_SEQ_LEN 6
111
112 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
113 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
114
115 static struct input_handler mousedev_handler;
116
117 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
118 static DEFINE_MUTEX(mousedev_table_mutex);
119 static struct mousedev *mousedev_mix;
120 static LIST_HEAD(mousedev_mix_list);
121
122 static void mixdev_open_devices(void);
123 static void mixdev_close_devices(void);
124
125 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
126 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
127
128 static void mousedev_touchpad_event(struct input_dev *dev,
129 struct mousedev *mousedev,
130 unsigned int code, int value)
131 {
132 int size, tmp;
133 enum { FRACTION_DENOM = 128 };
134
135 switch (code) {
136
137 case ABS_X:
138
139 fx(0) = value;
140 if (mousedev->touch && mousedev->pkt_count >= 2) {
141 size = input_abs_get_max(dev, ABS_X) -
142 input_abs_get_min(dev, ABS_X);
143 if (size == 0)
144 size = 256 * 2;
145
146 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
147 tmp += mousedev->frac_dx;
148 mousedev->packet.dx = tmp / FRACTION_DENOM;
149 mousedev->frac_dx =
150 tmp - mousedev->packet.dx * FRACTION_DENOM;
151 }
152 break;
153
154 case ABS_Y:
155 fy(0) = value;
156 if (mousedev->touch && mousedev->pkt_count >= 2) {
157 /* use X size for ABS_Y to keep the same scale */
158 size = input_abs_get_max(dev, ABS_X) -
159 input_abs_get_min(dev, ABS_X);
160 if (size == 0)
161 size = 256 * 2;
162
163 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
164 tmp += mousedev->frac_dy;
165 mousedev->packet.dy = tmp / FRACTION_DENOM;
166 mousedev->frac_dy = tmp -
167 mousedev->packet.dy * FRACTION_DENOM;
168 }
169 break;
170 }
171 }
172
173 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
174 unsigned int code, int value)
175 {
176 int min, max, size;
177
178 switch (code) {
179
180 case ABS_X:
181 min = input_abs_get_min(dev, ABS_X);
182 max = input_abs_get_max(dev, ABS_X);
183
184 size = max - min;
185 if (size == 0)
186 size = xres ? : 1;
187
188 clamp(value, min, max);
189
190 mousedev->packet.x = ((value - min) * xres) / size;
191 mousedev->packet.abs_event = 1;
192 break;
193
194 case ABS_Y:
195 min = input_abs_get_min(dev, ABS_Y);
196 max = input_abs_get_max(dev, ABS_Y);
197
198 size = max - min;
199 if (size == 0)
200 size = yres ? : 1;
201
202 clamp(value, min, max);
203
204 mousedev->packet.y = yres - ((value - min) * yres) / size;
205 mousedev->packet.abs_event = 1;
206 break;
207 }
208 }
209
210 static void mousedev_rel_event(struct mousedev *mousedev,
211 unsigned int code, int value)
212 {
213 switch (code) {
214 case REL_X:
215 mousedev->packet.dx += value;
216 break;
217
218 case REL_Y:
219 mousedev->packet.dy -= value;
220 break;
221
222 case REL_WHEEL:
223 mousedev->packet.dz -= value;
224 break;
225 }
226 }
227
228 static void mousedev_key_event(struct mousedev *mousedev,
229 unsigned int code, int value)
230 {
231 int index;
232
233 switch (code) {
234
235 case BTN_TOUCH:
236 case BTN_0:
237 case BTN_LEFT: index = 0; break;
238
239 case BTN_STYLUS:
240 case BTN_1:
241 case BTN_RIGHT: index = 1; break;
242
243 case BTN_2:
244 case BTN_FORWARD:
245 case BTN_STYLUS2:
246 case BTN_MIDDLE: index = 2; break;
247
248 case BTN_3:
249 case BTN_BACK:
250 case BTN_SIDE: index = 3; break;
251
252 case BTN_4:
253 case BTN_EXTRA: index = 4; break;
254
255 default: return;
256 }
257
258 if (value) {
259 set_bit(index, &mousedev->packet.buttons);
260 set_bit(index, &mousedev_mix->packet.buttons);
261 } else {
262 clear_bit(index, &mousedev->packet.buttons);
263 clear_bit(index, &mousedev_mix->packet.buttons);
264 }
265 }
266
267 static void mousedev_notify_readers(struct mousedev *mousedev,
268 struct mousedev_hw_data *packet)
269 {
270 struct mousedev_client *client;
271 struct mousedev_motion *p;
272 unsigned int new_head;
273 int wake_readers = 0;
274
275 rcu_read_lock();
276 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
277
278 /* Just acquire the lock, interrupts already disabled */
279 spin_lock(&client->packet_lock);
280
281 p = &client->packets[client->head];
282 if (client->ready && p->buttons != mousedev->packet.buttons) {
283 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
284 if (new_head != client->tail) {
285 p = &client->packets[client->head = new_head];
286 memset(p, 0, sizeof(struct mousedev_motion));
287 }
288 }
289
290 if (packet->abs_event) {
291 p->dx += packet->x - client->pos_x;
292 p->dy += packet->y - client->pos_y;
293 client->pos_x = packet->x;
294 client->pos_y = packet->y;
295 }
296
297 client->pos_x += packet->dx;
298 client->pos_x = client->pos_x < 0 ?
299 0 : (client->pos_x >= xres ? xres : client->pos_x);
300 client->pos_y += packet->dy;
301 client->pos_y = client->pos_y < 0 ?
302 0 : (client->pos_y >= yres ? yres : client->pos_y);
303
304 p->dx += packet->dx;
305 p->dy += packet->dy;
306 p->dz += packet->dz;
307 p->buttons = mousedev->packet.buttons;
308
309 if (p->dx || p->dy || p->dz ||
310 p->buttons != client->last_buttons)
311 client->ready = 1;
312
313 spin_unlock(&client->packet_lock);
314
315 if (client->ready) {
316 kill_fasync(&client->fasync, SIGIO, POLL_IN);
317 wake_readers = 1;
318 }
319 }
320 rcu_read_unlock();
321
322 if (wake_readers)
323 wake_up_interruptible(&mousedev->wait);
324 }
325
326 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
327 {
328 if (!value) {
329 if (mousedev->touch &&
330 time_before(jiffies,
331 mousedev->touch + msecs_to_jiffies(tap_time))) {
332 /*
333 * Toggle left button to emulate tap.
334 * We rely on the fact that mousedev_mix always has 0
335 * motion packet so we won't mess current position.
336 */
337 set_bit(0, &mousedev->packet.buttons);
338 set_bit(0, &mousedev_mix->packet.buttons);
339 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
340 mousedev_notify_readers(mousedev_mix,
341 &mousedev_mix->packet);
342 clear_bit(0, &mousedev->packet.buttons);
343 clear_bit(0, &mousedev_mix->packet.buttons);
344 }
345 mousedev->touch = mousedev->pkt_count = 0;
346 mousedev->frac_dx = 0;
347 mousedev->frac_dy = 0;
348
349 } else if (!mousedev->touch)
350 mousedev->touch = jiffies;
351 }
352
353 static void mousedev_event(struct input_handle *handle,
354 unsigned int type, unsigned int code, int value)
355 {
356 struct mousedev *mousedev = handle->private;
357
358 switch (type) {
359
360 case EV_ABS:
361 /* Ignore joysticks */
362 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
363 return;
364
365 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
366 mousedev_touchpad_event(handle->dev,
367 mousedev, code, value);
368 else
369 mousedev_abs_event(handle->dev, mousedev, code, value);
370
371 break;
372
373 case EV_REL:
374 mousedev_rel_event(mousedev, code, value);
375 break;
376
377 case EV_KEY:
378 if (value != 2) {
379 if (code == BTN_TOUCH &&
380 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
381 mousedev_touchpad_touch(mousedev, value);
382 else
383 mousedev_key_event(mousedev, code, value);
384 }
385 break;
386
387 case EV_SYN:
388 if (code == SYN_REPORT) {
389 if (mousedev->touch) {
390 mousedev->pkt_count++;
391 /*
392 * Input system eats duplicate events,
393 * but we need all of them to do correct
394 * averaging so apply present one forward
395 */
396 fx(0) = fx(1);
397 fy(0) = fy(1);
398 }
399
400 mousedev_notify_readers(mousedev, &mousedev->packet);
401 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
402
403 mousedev->packet.dx = mousedev->packet.dy =
404 mousedev->packet.dz = 0;
405 mousedev->packet.abs_event = 0;
406 }
407 break;
408 }
409 }
410
411 static int mousedev_fasync(int fd, struct file *file, int on)
412 {
413 struct mousedev_client *client = file->private_data;
414
415 return fasync_helper(fd, file, on, &client->fasync);
416 }
417
418 static void mousedev_free(struct device *dev)
419 {
420 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
421
422 input_put_device(mousedev->handle.dev);
423 kfree(mousedev);
424 }
425
426 static int mousedev_open_device(struct mousedev *mousedev)
427 {
428 int retval;
429
430 retval = mutex_lock_interruptible(&mousedev->mutex);
431 if (retval)
432 return retval;
433
434 if (mousedev->minor == MOUSEDEV_MIX)
435 mixdev_open_devices();
436 else if (!mousedev->exist)
437 retval = -ENODEV;
438 else if (!mousedev->open++) {
439 retval = input_open_device(&mousedev->handle);
440 if (retval)
441 mousedev->open--;
442 }
443
444 mutex_unlock(&mousedev->mutex);
445 return retval;
446 }
447
448 static void mousedev_close_device(struct mousedev *mousedev)
449 {
450 mutex_lock(&mousedev->mutex);
451
452 if (mousedev->minor == MOUSEDEV_MIX)
453 mixdev_close_devices();
454 else if (mousedev->exist && !--mousedev->open)
455 input_close_device(&mousedev->handle);
456
457 mutex_unlock(&mousedev->mutex);
458 }
459
460 /*
461 * Open all available devices so they can all be multiplexed in one.
462 * stream. Note that this function is called with mousedev_mix->mutex
463 * held.
464 */
465 static void mixdev_open_devices(void)
466 {
467 struct mousedev *mousedev;
468
469 if (mousedev_mix->open++)
470 return;
471
472 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
473 if (!mousedev->mixdev_open) {
474 if (mousedev_open_device(mousedev))
475 continue;
476
477 mousedev->mixdev_open = 1;
478 }
479 }
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(void)
488 {
489 struct mousedev *mousedev;
490
491 if (--mousedev_mix->open)
492 return;
493
494 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
495 if (mousedev->mixdev_open) {
496 mousedev->mixdev_open = 0;
497 mousedev_close_device(mousedev);
498 }
499 }
500 }
501
502
503 static void mousedev_attach_client(struct mousedev *mousedev,
504 struct mousedev_client *client)
505 {
506 spin_lock(&mousedev->client_lock);
507 list_add_tail_rcu(&client->node, &mousedev->client_list);
508 spin_unlock(&mousedev->client_lock);
509 synchronize_rcu();
510 }
511
512 static void mousedev_detach_client(struct mousedev *mousedev,
513 struct mousedev_client *client)
514 {
515 spin_lock(&mousedev->client_lock);
516 list_del_rcu(&client->node);
517 spin_unlock(&mousedev->client_lock);
518 synchronize_rcu();
519 }
520
521 static int mousedev_release(struct inode *inode, struct file *file)
522 {
523 struct mousedev_client *client = file->private_data;
524 struct mousedev *mousedev = client->mousedev;
525
526 mousedev_detach_client(mousedev, client);
527 kfree(client);
528
529 mousedev_close_device(mousedev);
530 put_device(&mousedev->dev);
531
532 return 0;
533 }
534
535 static int mousedev_open(struct inode *inode, struct file *file)
536 {
537 struct mousedev_client *client;
538 struct mousedev *mousedev;
539 int error;
540 int i;
541
542 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
543 if (imajor(inode) == MISC_MAJOR)
544 i = MOUSEDEV_MIX;
545 else
546 #endif
547 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
548
549 if (i >= MOUSEDEV_MINORS)
550 return -ENODEV;
551
552 error = mutex_lock_interruptible(&mousedev_table_mutex);
553 if (error) {
554 return error;
555 }
556 mousedev = mousedev_table[i];
557 if (mousedev)
558 get_device(&mousedev->dev);
559 mutex_unlock(&mousedev_table_mutex);
560
561 if (!mousedev) {
562 return -ENODEV;
563 }
564
565 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
566 if (!client) {
567 error = -ENOMEM;
568 goto err_put_mousedev;
569 }
570
571 spin_lock_init(&client->packet_lock);
572 client->pos_x = xres / 2;
573 client->pos_y = yres / 2;
574 client->mousedev = mousedev;
575 mousedev_attach_client(mousedev, client);
576
577 error = mousedev_open_device(mousedev);
578 if (error)
579 goto err_free_client;
580
581 file->private_data = client;
582 return 0;
583
584 err_free_client:
585 mousedev_detach_client(mousedev, client);
586 kfree(client);
587 err_put_mousedev:
588 put_device(&mousedev->dev);
589 return error;
590 }
591
592 static inline int mousedev_limit_delta(int delta, int limit)
593 {
594 return delta > limit ? limit : (delta < -limit ? -limit : delta);
595 }
596
597 static void mousedev_packet(struct mousedev_client *client,
598 signed char *ps2_data)
599 {
600 struct mousedev_motion *p = &client->packets[client->tail];
601
602 ps2_data[0] = 0x08 |
603 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
604 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
605 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
606 p->dx -= ps2_data[1];
607 p->dy -= ps2_data[2];
608
609 switch (client->mode) {
610 case MOUSEDEV_EMUL_EXPS:
611 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
612 p->dz -= ps2_data[3];
613 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
614 client->bufsiz = 4;
615 break;
616
617 case MOUSEDEV_EMUL_IMPS:
618 ps2_data[0] |=
619 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
620 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
621 p->dz -= ps2_data[3];
622 client->bufsiz = 4;
623 break;
624
625 case MOUSEDEV_EMUL_PS2:
626 default:
627 ps2_data[0] |=
628 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
629 p->dz = 0;
630 client->bufsiz = 3;
631 break;
632 }
633
634 if (!p->dx && !p->dy && !p->dz) {
635 if (client->tail == client->head) {
636 client->ready = 0;
637 client->last_buttons = p->buttons;
638 } else
639 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
640 }
641 }
642
643 static void mousedev_generate_response(struct mousedev_client *client,
644 int command)
645 {
646 client->ps2[0] = 0xfa; /* ACK */
647
648 switch (command) {
649
650 case 0xeb: /* Poll */
651 mousedev_packet(client, &client->ps2[1]);
652 client->bufsiz++; /* account for leading ACK */
653 break;
654
655 case 0xf2: /* Get ID */
656 switch (client->mode) {
657 case MOUSEDEV_EMUL_PS2:
658 client->ps2[1] = 0;
659 break;
660 case MOUSEDEV_EMUL_IMPS:
661 client->ps2[1] = 3;
662 break;
663 case MOUSEDEV_EMUL_EXPS:
664 client->ps2[1] = 4;
665 break;
666 }
667 client->bufsiz = 2;
668 break;
669
670 case 0xe9: /* Get info */
671 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
672 client->bufsiz = 4;
673 break;
674
675 case 0xff: /* Reset */
676 client->impsseq = client->imexseq = 0;
677 client->mode = MOUSEDEV_EMUL_PS2;
678 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
679 client->bufsiz = 3;
680 break;
681
682 default:
683 client->bufsiz = 1;
684 break;
685 }
686 client->buffer = client->bufsiz;
687 }
688
689 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
690 size_t count, loff_t *ppos)
691 {
692 struct mousedev_client *client = file->private_data;
693 unsigned char c;
694 unsigned int i;
695
696 for (i = 0; i < count; i++) {
697
698 if (get_user(c, buffer + i))
699 return -EFAULT;
700
701 spin_lock_irq(&client->packet_lock);
702
703 if (c == mousedev_imex_seq[client->imexseq]) {
704 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
705 client->imexseq = 0;
706 client->mode = MOUSEDEV_EMUL_EXPS;
707 }
708 } else
709 client->imexseq = 0;
710
711 if (c == mousedev_imps_seq[client->impsseq]) {
712 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
713 client->impsseq = 0;
714 client->mode = MOUSEDEV_EMUL_IMPS;
715 }
716 } else
717 client->impsseq = 0;
718
719 mousedev_generate_response(client, c);
720
721 spin_unlock_irq(&client->packet_lock);
722 }
723
724 kill_fasync(&client->fasync, SIGIO, POLL_IN);
725 wake_up_interruptible(&client->mousedev->wait);
726
727 return count;
728 }
729
730 static ssize_t mousedev_read(struct file *file, char __user *buffer,
731 size_t count, loff_t *ppos)
732 {
733 struct mousedev_client *client = file->private_data;
734 struct mousedev *mousedev = client->mousedev;
735 signed char data[sizeof(client->ps2)];
736 int retval = 0;
737
738 if (!client->ready && !client->buffer && mousedev->exist &&
739 (file->f_flags & O_NONBLOCK))
740 return -EAGAIN;
741
742 retval = wait_event_interruptible(mousedev->wait,
743 !mousedev->exist || client->ready || client->buffer);
744 if (retval)
745 return retval;
746
747 if (!mousedev->exist)
748 return -ENODEV;
749
750 spin_lock_irq(&client->packet_lock);
751
752 if (!client->buffer && client->ready) {
753 mousedev_packet(client, client->ps2);
754 client->buffer = client->bufsiz;
755 }
756
757 if (count > client->buffer)
758 count = client->buffer;
759
760 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
761 client->buffer -= count;
762
763 spin_unlock_irq(&client->packet_lock);
764
765 if (copy_to_user(buffer, data, count))
766 return -EFAULT;
767
768 return count;
769 }
770
771 /* No kernel lock - fine */
772 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
773 {
774 struct mousedev_client *client = file->private_data;
775 struct mousedev *mousedev = client->mousedev;
776 unsigned int mask;
777
778 poll_wait(file, &mousedev->wait, wait);
779
780 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
781 if (client->ready || client->buffer)
782 mask |= POLLIN | POLLRDNORM;
783
784 return mask;
785 }
786
787 static const struct file_operations mousedev_fops = {
788 .owner = THIS_MODULE,
789 .read = mousedev_read,
790 .write = mousedev_write,
791 .poll = mousedev_poll,
792 .open = mousedev_open,
793 .release = mousedev_release,
794 .fasync = mousedev_fasync,
795 };
796
797 static int mousedev_install_chrdev(struct mousedev *mousedev)
798 {
799 mousedev_table[mousedev->minor] = mousedev;
800 return 0;
801 }
802
803 static void mousedev_remove_chrdev(struct mousedev *mousedev)
804 {
805 mutex_lock(&mousedev_table_mutex);
806 mousedev_table[mousedev->minor] = NULL;
807 mutex_unlock(&mousedev_table_mutex);
808 }
809
810 /*
811 * Mark device non-existent. This disables writes, ioctls and
812 * prevents new users from opening the device. Already posted
813 * blocking reads will stay, however new ones will fail.
814 */
815 static void mousedev_mark_dead(struct mousedev *mousedev)
816 {
817 mutex_lock(&mousedev->mutex);
818 mousedev->exist = false;
819 mutex_unlock(&mousedev->mutex);
820 }
821
822 /*
823 * Wake up users waiting for IO so they can disconnect from
824 * dead device.
825 */
826 static void mousedev_hangup(struct mousedev *mousedev)
827 {
828 struct mousedev_client *client;
829
830 spin_lock(&mousedev->client_lock);
831 list_for_each_entry(client, &mousedev->client_list, node)
832 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
833 spin_unlock(&mousedev->client_lock);
834
835 wake_up_interruptible(&mousedev->wait);
836 }
837
838 static void mousedev_cleanup(struct mousedev *mousedev)
839 {
840 struct input_handle *handle = &mousedev->handle;
841
842 mousedev_mark_dead(mousedev);
843 mousedev_hangup(mousedev);
844 mousedev_remove_chrdev(mousedev);
845
846 /* mousedev is marked dead so no one else accesses mousedev->open */
847 if (mousedev->open)
848 input_close_device(handle);
849 }
850
851 static struct mousedev *mousedev_create(struct input_dev *dev,
852 struct input_handler *handler,
853 int minor)
854 {
855 struct mousedev *mousedev;
856 int error;
857
858 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
859 if (!mousedev) {
860 error = -ENOMEM;
861 goto err_out;
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 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
870 init_waitqueue_head(&mousedev->wait);
871
872 if (minor == MOUSEDEV_MIX)
873 dev_set_name(&mousedev->dev, "mice");
874 else
875 dev_set_name(&mousedev->dev, "mouse%d", minor);
876
877 mousedev->minor = minor;
878 mousedev->exist = true;
879 mousedev->handle.dev = input_get_device(dev);
880 mousedev->handle.name = dev_name(&mousedev->dev);
881 mousedev->handle.handler = handler;
882 mousedev->handle.private = mousedev;
883
884 mousedev->dev.class = &input_class;
885 if (dev)
886 mousedev->dev.parent = &dev->dev;
887 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
888 mousedev->dev.release = mousedev_free;
889 device_initialize(&mousedev->dev);
890
891 if (minor != MOUSEDEV_MIX) {
892 error = input_register_handle(&mousedev->handle);
893 if (error)
894 goto err_free_mousedev;
895 }
896
897 error = mousedev_install_chrdev(mousedev);
898 if (error)
899 goto err_unregister_handle;
900
901 error = device_add(&mousedev->dev);
902 if (error)
903 goto err_cleanup_mousedev;
904
905 return mousedev;
906
907 err_cleanup_mousedev:
908 mousedev_cleanup(mousedev);
909 err_unregister_handle:
910 if (minor != MOUSEDEV_MIX)
911 input_unregister_handle(&mousedev->handle);
912 err_free_mousedev:
913 put_device(&mousedev->dev);
914 err_out:
915 return ERR_PTR(error);
916 }
917
918 static void mousedev_destroy(struct mousedev *mousedev)
919 {
920 device_del(&mousedev->dev);
921 mousedev_cleanup(mousedev);
922 if (mousedev->minor != MOUSEDEV_MIX)
923 input_unregister_handle(&mousedev->handle);
924 put_device(&mousedev->dev);
925 }
926
927 static int mixdev_add_device(struct mousedev *mousedev)
928 {
929 int retval;
930
931 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
932 if (retval)
933 return retval;
934
935 if (mousedev_mix->open) {
936 retval = mousedev_open_device(mousedev);
937 if (retval)
938 goto out;
939
940 mousedev->mixdev_open = 1;
941 }
942
943 get_device(&mousedev->dev);
944 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
945
946 out:
947 mutex_unlock(&mousedev_mix->mutex);
948 return retval;
949 }
950
951 static void mixdev_remove_device(struct mousedev *mousedev)
952 {
953 mutex_lock(&mousedev_mix->mutex);
954
955 if (mousedev->mixdev_open) {
956 mousedev->mixdev_open = 0;
957 mousedev_close_device(mousedev);
958 }
959
960 list_del_init(&mousedev->mixdev_node);
961 mutex_unlock(&mousedev_mix->mutex);
962
963 put_device(&mousedev->dev);
964 }
965
966 static int mousedev_connect(struct input_handler *handler,
967 struct input_dev *dev,
968 const struct input_device_id *id)
969 {
970 struct mousedev *mousedev;
971 int minor;
972 int error;
973
974 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
975 if (!mousedev_table[minor])
976 break;
977
978 if (minor == MOUSEDEV_MINORS) {
979 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
980 return -ENFILE;
981 }
982
983 mousedev = mousedev_create(dev, handler, minor);
984 if (IS_ERR(mousedev))
985 return PTR_ERR(mousedev);
986
987 error = mixdev_add_device(mousedev);
988 if (error) {
989 mousedev_destroy(mousedev);
990 return error;
991 }
992
993 return 0;
994 }
995
996 static void mousedev_disconnect(struct input_handle *handle)
997 {
998 struct mousedev *mousedev = handle->private;
999
1000 mixdev_remove_device(mousedev);
1001 mousedev_destroy(mousedev);
1002 }
1003
1004 static const struct input_device_id mousedev_ids[] = {
1005 {
1006 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1007 INPUT_DEVICE_ID_MATCH_KEYBIT |
1008 INPUT_DEVICE_ID_MATCH_RELBIT,
1009 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1010 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1011 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
1012 }, /* A mouse like device, at least one button,
1013 two relative axes */
1014 {
1015 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1016 INPUT_DEVICE_ID_MATCH_RELBIT,
1017 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1018 .relbit = { BIT_MASK(REL_WHEEL) },
1019 }, /* A separate scrollwheel */
1020 {
1021 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1022 INPUT_DEVICE_ID_MATCH_KEYBIT |
1023 INPUT_DEVICE_ID_MATCH_ABSBIT,
1024 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1025 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1026 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1027 }, /* A tablet like device, at least touch detection,
1028 two absolute axes */
1029 {
1030 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1031 INPUT_DEVICE_ID_MATCH_KEYBIT |
1032 INPUT_DEVICE_ID_MATCH_ABSBIT,
1033 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1034 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1035 BIT_MASK(BTN_TOOL_FINGER) },
1036 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1037 BIT_MASK(ABS_PRESSURE) |
1038 BIT_MASK(ABS_TOOL_WIDTH) },
1039 }, /* A touchpad */
1040 {
1041 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1042 INPUT_DEVICE_ID_MATCH_KEYBIT |
1043 INPUT_DEVICE_ID_MATCH_ABSBIT,
1044 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1045 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1046 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1047 }, /* Mouse-like device with absolute X and Y but ordinary
1048 clicks, like hp ILO2 High Performance mouse */
1049
1050 { }, /* Terminating entry */
1051 };
1052
1053 MODULE_DEVICE_TABLE(input, mousedev_ids);
1054
1055 static struct input_handler mousedev_handler = {
1056 .event = mousedev_event,
1057 .connect = mousedev_connect,
1058 .disconnect = mousedev_disconnect,
1059 .fops = &mousedev_fops,
1060 .minor = MOUSEDEV_MINOR_BASE,
1061 .name = "mousedev",
1062 .id_table = mousedev_ids,
1063 };
1064
1065 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1066 static struct miscdevice psaux_mouse = {
1067 PSMOUSE_MINOR, "psaux", &mousedev_fops
1068 };
1069 static int psaux_registered;
1070 #endif
1071
1072 static int __init mousedev_init(void)
1073 {
1074 int error;
1075
1076 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1077 if (IS_ERR(mousedev_mix))
1078 return PTR_ERR(mousedev_mix);
1079
1080 error = input_register_handler(&mousedev_handler);
1081 if (error) {
1082 mousedev_destroy(mousedev_mix);
1083 return error;
1084 }
1085
1086 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1087 error = misc_register(&psaux_mouse);
1088 if (error)
1089 printk(KERN_WARNING "mice: could not register psaux device, "
1090 "error: %d\n", error);
1091 else
1092 psaux_registered = 1;
1093 #endif
1094
1095 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1096
1097 return 0;
1098 }
1099
1100 static void __exit mousedev_exit(void)
1101 {
1102 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1103 if (psaux_registered)
1104 misc_deregister(&psaux_mouse);
1105 #endif
1106 input_unregister_handler(&mousedev_handler);
1107 mousedev_destroy(mousedev_mix);
1108 }
1109
1110 module_init(mousedev_init);
1111 module_exit(mousedev_exit);
Tomato firmware and modifications.