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Merge remote-tracking branch 'logfs/master'
[linux-2.6/next.git] / drivers / input / mousedev.c
blob0110b5a3a1678a7a0843672b8505e6f42c664fc1
1 /*
2 * Input driver to ExplorerPS/2 device driver module.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 2004 Dmitry Torokhov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #define MOUSEDEV_MINOR_BASE 32
15 #define MOUSEDEV_MINORS 32
16 #define MOUSEDEV_MIX 31
17
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/poll.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/input.h>
24 #include <linux/random.h>
25 #include <linux/major.h>
26 #include <linux/device.h>
27 #include <linux/kernel.h>
28 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
29 #include <linux/miscdevice.h>
30 #endif
31
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
34 MODULE_LICENSE("GPL");
35
36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
38 #endif
39 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
40 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
41 #endif
42
43 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
44 module_param(xres, uint, 0644);
45 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
46
47 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
48 module_param(yres, uint, 0644);
49 MODULE_PARM_DESC(yres, "Vertical screen resolution");
50
51 static unsigned tap_time = 200;
52 module_param(tap_time, uint, 0644);
53 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
54
55 struct mousedev_hw_data {
56 int dx, dy, dz;
57 int x, y;
58 int abs_event;
59 unsigned long buttons;
60 };
61
62 struct mousedev {
63 int open;
64 int minor;
65 struct input_handle handle;
66 wait_queue_head_t wait;
67 struct list_head client_list;
68 spinlock_t client_lock; /* protects client_list */
69 struct mutex mutex;
70 struct device dev;
71 bool exist;
72
73 struct list_head mixdev_node;
74 int mixdev_open;
75
76 struct mousedev_hw_data packet;
77 unsigned int pkt_count;
78 int old_x[4], old_y[4];
79 int frac_dx, frac_dy;
80 unsigned long touch;
81 };
82
83 enum mousedev_emul {
84 MOUSEDEV_EMUL_PS2,
85 MOUSEDEV_EMUL_IMPS,
86 MOUSEDEV_EMUL_EXPS
87 };
88
89 struct mousedev_motion {
90 int dx, dy, dz;
91 unsigned long buttons;
92 };
93
94 #define PACKET_QUEUE_LEN 16
95 struct mousedev_client {
96 struct fasync_struct *fasync;
97 struct mousedev *mousedev;
98 struct list_head node;
99
100 struct mousedev_motion packets[PACKET_QUEUE_LEN];
101 unsigned int head, tail;
102 spinlock_t packet_lock;
103 int pos_x, pos_y;
104
105 signed char ps2[6];
106 unsigned char ready, buffer, bufsiz;
107 unsigned char imexseq, impsseq;
108 enum mousedev_emul mode;
109 unsigned long last_buttons;
110 };
111
112 #define MOUSEDEV_SEQ_LEN 6
113
114 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
115 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
116
117 static struct input_handler mousedev_handler;
118
119 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
120 static DEFINE_MUTEX(mousedev_table_mutex);
121 static struct mousedev *mousedev_mix;
122 static LIST_HEAD(mousedev_mix_list);
123
124 static void mixdev_open_devices(void);
125 static void mixdev_close_devices(void);
126
127 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
128 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
129
130 static void mousedev_touchpad_event(struct input_dev *dev,
131 struct mousedev *mousedev,
132 unsigned int code, int value)
133 {
134 int size, tmp;
135 enum { FRACTION_DENOM = 128 };
136
137 switch (code) {
138
139 case ABS_X:
140
141 fx(0) = value;
142 if (mousedev->touch && mousedev->pkt_count >= 2) {
143 size = input_abs_get_max(dev, ABS_X) -
144 input_abs_get_min(dev, ABS_X);
145 if (size == 0)
146 size = 256 * 2;
147
148 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
149 tmp += mousedev->frac_dx;
150 mousedev->packet.dx = tmp / FRACTION_DENOM;
151 mousedev->frac_dx =
152 tmp - mousedev->packet.dx * FRACTION_DENOM;
153 }
154 break;
155
156 case ABS_Y:
157 fy(0) = value;
158 if (mousedev->touch && mousedev->pkt_count >= 2) {
159 /* use X size for ABS_Y to keep the same scale */
160 size = input_abs_get_max(dev, ABS_X) -
161 input_abs_get_min(dev, ABS_X);
162 if (size == 0)
163 size = 256 * 2;
164
165 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
166 tmp += mousedev->frac_dy;
167 mousedev->packet.dy = tmp / FRACTION_DENOM;
168 mousedev->frac_dy = tmp -
169 mousedev->packet.dy * FRACTION_DENOM;
170 }
171 break;
172 }
173 }
174
175 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
176 unsigned int code, int value)
177 {
178 int min, max, size;
179
180 switch (code) {
181
182 case ABS_X:
183 min = input_abs_get_min(dev, ABS_X);
184 max = input_abs_get_max(dev, ABS_X);
185
186 size = max - min;
187 if (size == 0)
188 size = xres ? : 1;
189
190 value = clamp(value, min, max);
191
192 mousedev->packet.x = ((value - min) * xres) / size;
193 mousedev->packet.abs_event = 1;
194 break;
195
196 case ABS_Y:
197 min = input_abs_get_min(dev, ABS_Y);
198 max = input_abs_get_max(dev, ABS_Y);
199
200 size = max - min;
201 if (size == 0)
202 size = yres ? : 1;
203
204 value = clamp(value, min, max);
205
206 mousedev->packet.y = yres - ((value - min) * yres) / size;
207 mousedev->packet.abs_event = 1;
208 break;
209 }
210 }
211
212 static void mousedev_rel_event(struct mousedev *mousedev,
213 unsigned int code, int value)
214 {
215 switch (code) {
216 case REL_X:
217 mousedev->packet.dx += value;
218 break;
219
220 case REL_Y:
221 mousedev->packet.dy -= value;
222 break;
223
224 case REL_WHEEL:
225 mousedev->packet.dz -= value;
226 break;
227 }
228 }
229
230 static void mousedev_key_event(struct mousedev *mousedev,
231 unsigned int code, int value)
232 {
233 int index;
234
235 switch (code) {
236
237 case BTN_TOUCH:
238 case BTN_0:
239 case BTN_LEFT: index = 0; break;
240
241 case BTN_STYLUS:
242 case BTN_1:
243 case BTN_RIGHT: index = 1; break;
244
245 case BTN_2:
246 case BTN_FORWARD:
247 case BTN_STYLUS2:
248 case BTN_MIDDLE: index = 2; break;
249
250 case BTN_3:
251 case BTN_BACK:
252 case BTN_SIDE: index = 3; break;
253
254 case BTN_4:
255 case BTN_EXTRA: index = 4; break;
256
257 default: return;
258 }
259
260 if (value) {
261 set_bit(index, &mousedev->packet.buttons);
262 set_bit(index, &mousedev_mix->packet.buttons);
263 } else {
264 clear_bit(index, &mousedev->packet.buttons);
265 clear_bit(index, &mousedev_mix->packet.buttons);
266 }
267 }
268
269 static void mousedev_notify_readers(struct mousedev *mousedev,
270 struct mousedev_hw_data *packet)
271 {
272 struct mousedev_client *client;
273 struct mousedev_motion *p;
274 unsigned int new_head;
275 int wake_readers = 0;
276
277 rcu_read_lock();
278 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
279
280 /* Just acquire the lock, interrupts already disabled */
281 spin_lock(&client->packet_lock);
282
283 p = &client->packets[client->head];
284 if (client->ready && p->buttons != mousedev->packet.buttons) {
285 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
286 if (new_head != client->tail) {
287 p = &client->packets[client->head = new_head];
288 memset(p, 0, sizeof(struct mousedev_motion));
289 }
290 }
291
292 if (packet->abs_event) {
293 p->dx += packet->x - client->pos_x;
294 p->dy += packet->y - client->pos_y;
295 client->pos_x = packet->x;
296 client->pos_y = packet->y;
297 }
298
299 client->pos_x += packet->dx;
300 client->pos_x = client->pos_x < 0 ?
301 0 : (client->pos_x >= xres ? xres : client->pos_x);
302 client->pos_y += packet->dy;
303 client->pos_y = client->pos_y < 0 ?
304 0 : (client->pos_y >= yres ? yres : client->pos_y);
305
306 p->dx += packet->dx;
307 p->dy += packet->dy;
308 p->dz += packet->dz;
309 p->buttons = mousedev->packet.buttons;
310
311 if (p->dx || p->dy || p->dz ||
312 p->buttons != client->last_buttons)
313 client->ready = 1;
314
315 spin_unlock(&client->packet_lock);
316
317 if (client->ready) {
318 kill_fasync(&client->fasync, SIGIO, POLL_IN);
319 wake_readers = 1;
320 }
321 }
322 rcu_read_unlock();
323
324 if (wake_readers)
325 wake_up_interruptible(&mousedev->wait);
326 }
327
328 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
329 {
330 if (!value) {
331 if (mousedev->touch &&
332 time_before(jiffies,
333 mousedev->touch + msecs_to_jiffies(tap_time))) {
334 /*
335 * Toggle left button to emulate tap.
336 * We rely on the fact that mousedev_mix always has 0
337 * motion packet so we won't mess current position.
338 */
339 set_bit(0, &mousedev->packet.buttons);
340 set_bit(0, &mousedev_mix->packet.buttons);
341 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
342 mousedev_notify_readers(mousedev_mix,
343 &mousedev_mix->packet);
344 clear_bit(0, &mousedev->packet.buttons);
345 clear_bit(0, &mousedev_mix->packet.buttons);
346 }
347 mousedev->touch = mousedev->pkt_count = 0;
348 mousedev->frac_dx = 0;
349 mousedev->frac_dy = 0;
350
351 } else if (!mousedev->touch)
352 mousedev->touch = jiffies;
353 }
354
355 static void mousedev_event(struct input_handle *handle,
356 unsigned int type, unsigned int code, int value)
357 {
358 struct mousedev *mousedev = handle->private;
359
360 switch (type) {
361
362 case EV_ABS:
363 /* Ignore joysticks */
364 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
365 return;
366
367 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
368 mousedev_touchpad_event(handle->dev,
369 mousedev, code, value);
370 else
371 mousedev_abs_event(handle->dev, mousedev, code, value);
372
373 break;
374
375 case EV_REL:
376 mousedev_rel_event(mousedev, code, value);
377 break;
378
379 case EV_KEY:
380 if (value != 2) {
381 if (code == BTN_TOUCH &&
382 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
383 mousedev_touchpad_touch(mousedev, value);
384 else
385 mousedev_key_event(mousedev, code, value);
386 }
387 break;
388
389 case EV_SYN:
390 if (code == SYN_REPORT) {
391 if (mousedev->touch) {
392 mousedev->pkt_count++;
393 /*
394 * Input system eats duplicate events,
395 * but we need all of them to do correct
396 * averaging so apply present one forward
397 */
398 fx(0) = fx(1);
399 fy(0) = fy(1);
400 }
401
402 mousedev_notify_readers(mousedev, &mousedev->packet);
403 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
404
405 mousedev->packet.dx = mousedev->packet.dy =
406 mousedev->packet.dz = 0;
407 mousedev->packet.abs_event = 0;
408 }
409 break;
410 }
411 }
412
413 static int mousedev_fasync(int fd, struct file *file, int on)
414 {
415 struct mousedev_client *client = file->private_data;
416
417 return fasync_helper(fd, file, on, &client->fasync);
418 }
419
420 static void mousedev_free(struct device *dev)
421 {
422 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
423
424 input_put_device(mousedev->handle.dev);
425 kfree(mousedev);
426 }
427
428 static int mousedev_open_device(struct mousedev *mousedev)
429 {
430 int retval;
431
432 retval = mutex_lock_interruptible(&mousedev->mutex);
433 if (retval)
434 return retval;
435
436 if (mousedev->minor == MOUSEDEV_MIX)
437 mixdev_open_devices();
438 else if (!mousedev->exist)
439 retval = -ENODEV;
440 else if (!mousedev->open++) {
441 retval = input_open_device(&mousedev->handle);
442 if (retval)
443 mousedev->open--;
444 }
445
446 mutex_unlock(&mousedev->mutex);
447 return retval;
448 }
449
450 static void mousedev_close_device(struct mousedev *mousedev)
451 {
452 mutex_lock(&mousedev->mutex);
453
454 if (mousedev->minor == MOUSEDEV_MIX)
455 mixdev_close_devices();
456 else if (mousedev->exist && !--mousedev->open)
457 input_close_device(&mousedev->handle);
458
459 mutex_unlock(&mousedev->mutex);
460 }
461
462 /*
463 * Open all available devices so they can all be multiplexed in one.
464 * stream. Note that this function is called with mousedev_mix->mutex
465 * held.
466 */
467 static void mixdev_open_devices(void)
468 {
469 struct mousedev *mousedev;
470
471 if (mousedev_mix->open++)
472 return;
473
474 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
475 if (!mousedev->mixdev_open) {
476 if (mousedev_open_device(mousedev))
477 continue;
478
479 mousedev->mixdev_open = 1;
480 }
481 }
482 }
483
484 /*
485 * Close all devices that were opened as part of multiplexed
486 * device. Note that this function is called with mousedev_mix->mutex
487 * held.
488 */
489 static void mixdev_close_devices(void)
490 {
491 struct mousedev *mousedev;
492
493 if (--mousedev_mix->open)
494 return;
495
496 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
497 if (mousedev->mixdev_open) {
498 mousedev->mixdev_open = 0;
499 mousedev_close_device(mousedev);
500 }
501 }
502 }
503
504
505 static void mousedev_attach_client(struct mousedev *mousedev,
506 struct mousedev_client *client)
507 {
508 spin_lock(&mousedev->client_lock);
509 list_add_tail_rcu(&client->node, &mousedev->client_list);
510 spin_unlock(&mousedev->client_lock);
511 }
512
513 static void mousedev_detach_client(struct mousedev *mousedev,
514 struct mousedev_client *client)
515 {
516 spin_lock(&mousedev->client_lock);
517 list_del_rcu(&client->node);
518 spin_unlock(&mousedev->client_lock);
519 synchronize_rcu();
520 }
521
522 static int mousedev_release(struct inode *inode, struct file *file)
523 {
524 struct mousedev_client *client = file->private_data;
525 struct mousedev *mousedev = client->mousedev;
526
527 mousedev_detach_client(mousedev, client);
528 kfree(client);
529
530 mousedev_close_device(mousedev);
531 put_device(&mousedev->dev);
532
533 return 0;
534 }
535
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 int i;
542
543 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
544 if (imajor(inode) == MISC_MAJOR)
545 i = MOUSEDEV_MIX;
546 else
547 #endif
548 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
549
550 if (i >= MOUSEDEV_MINORS)
551 return -ENODEV;
552
553 error = mutex_lock_interruptible(&mousedev_table_mutex);
554 if (error) {
555 return error;
556 }
557 mousedev = mousedev_table[i];
558 if (mousedev)
559 get_device(&mousedev->dev);
560 mutex_unlock(&mousedev_table_mutex);
561
562 if (!mousedev) {
563 return -ENODEV;
564 }
565
566 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
567 if (!client) {
568 error = -ENOMEM;
569 goto err_put_mousedev;
570 }
571
572 spin_lock_init(&client->packet_lock);
573 client->pos_x = xres / 2;
574 client->pos_y = yres / 2;
575 client->mousedev = mousedev;
576 mousedev_attach_client(mousedev, client);
577
578 error = mousedev_open_device(mousedev);
579 if (error)
580 goto err_free_client;
581
582 file->private_data = client;
583 return 0;
584
585 err_free_client:
586 mousedev_detach_client(mousedev, client);
587 kfree(client);
588 err_put_mousedev:
589 put_device(&mousedev->dev);
590 return error;
591 }
592
593 static inline int mousedev_limit_delta(int delta, int limit)
594 {
595 return delta > limit ? limit : (delta < -limit ? -limit : delta);
596 }
597
598 static void mousedev_packet(struct mousedev_client *client,
599 signed char *ps2_data)
600 {
601 struct mousedev_motion *p = &client->packets[client->tail];
602
603 ps2_data[0] = 0x08 |
604 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
605 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
606 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
607 p->dx -= ps2_data[1];
608 p->dy -= ps2_data[2];
609
610 switch (client->mode) {
611 case MOUSEDEV_EMUL_EXPS:
612 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
613 p->dz -= ps2_data[3];
614 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
615 client->bufsiz = 4;
616 break;
617
618 case MOUSEDEV_EMUL_IMPS:
619 ps2_data[0] |=
620 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
621 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
622 p->dz -= ps2_data[3];
623 client->bufsiz = 4;
624 break;
625
626 case MOUSEDEV_EMUL_PS2:
627 default:
628 ps2_data[0] |=
629 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
630 p->dz = 0;
631 client->bufsiz = 3;
632 break;
633 }
634
635 if (!p->dx && !p->dy && !p->dz) {
636 if (client->tail == client->head) {
637 client->ready = 0;
638 client->last_buttons = p->buttons;
639 } else
640 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
641 }
642 }
643
644 static void mousedev_generate_response(struct mousedev_client *client,
645 int command)
646 {
647 client->ps2[0] = 0xfa; /* ACK */
648
649 switch (command) {
650
651 case 0xeb: /* Poll */
652 mousedev_packet(client, &client->ps2[1]);
653 client->bufsiz++; /* account for leading ACK */
654 break;
655
656 case 0xf2: /* Get ID */
657 switch (client->mode) {
658 case MOUSEDEV_EMUL_PS2:
659 client->ps2[1] = 0;
660 break;
661 case MOUSEDEV_EMUL_IMPS:
662 client->ps2[1] = 3;
663 break;
664 case MOUSEDEV_EMUL_EXPS:
665 client->ps2[1] = 4;
666 break;
667 }
668 client->bufsiz = 2;
669 break;
670
671 case 0xe9: /* Get info */
672 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
673 client->bufsiz = 4;
674 break;
675
676 case 0xff: /* Reset */
677 client->impsseq = client->imexseq = 0;
678 client->mode = MOUSEDEV_EMUL_PS2;
679 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
680 client->bufsiz = 3;
681 break;
682
683 default:
684 client->bufsiz = 1;
685 break;
686 }
687 client->buffer = client->bufsiz;
688 }
689
690 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
691 size_t count, loff_t *ppos)
692 {
693 struct mousedev_client *client = file->private_data;
694 unsigned char c;
695 unsigned int i;
696
697 for (i = 0; i < count; i++) {
698
699 if (get_user(c, buffer + i))
700 return -EFAULT;
701
702 spin_lock_irq(&client->packet_lock);
703
704 if (c == mousedev_imex_seq[client->imexseq]) {
705 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
706 client->imexseq = 0;
707 client->mode = MOUSEDEV_EMUL_EXPS;
708 }
709 } else
710 client->imexseq = 0;
711
712 if (c == mousedev_imps_seq[client->impsseq]) {
713 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
714 client->impsseq = 0;
715 client->mode = MOUSEDEV_EMUL_IMPS;
716 }
717 } else
718 client->impsseq = 0;
719
720 mousedev_generate_response(client, c);
721
722 spin_unlock_irq(&client->packet_lock);
723 }
724
725 kill_fasync(&client->fasync, SIGIO, POLL_IN);
726 wake_up_interruptible(&client->mousedev->wait);
727
728 return count;
729 }
730
731 static ssize_t mousedev_read(struct file *file, char __user *buffer,
732 size_t count, loff_t *ppos)
733 {
734 struct mousedev_client *client = file->private_data;
735 struct mousedev *mousedev = client->mousedev;
736 signed char data[sizeof(client->ps2)];
737 int retval = 0;
738
739 if (!client->ready && !client->buffer && mousedev->exist &&
740 (file->f_flags & O_NONBLOCK))
741 return -EAGAIN;
742
743 retval = wait_event_interruptible(mousedev->wait,
744 !mousedev->exist || client->ready || client->buffer);
745 if (retval)
746 return retval;
747
748 if (!mousedev->exist)
749 return -ENODEV;
750
751 spin_lock_irq(&client->packet_lock);
752
753 if (!client->buffer && client->ready) {
754 mousedev_packet(client, client->ps2);
755 client->buffer = client->bufsiz;
756 }
757
758 if (count > client->buffer)
759 count = client->buffer;
760
761 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
762 client->buffer -= count;
763
764 spin_unlock_irq(&client->packet_lock);
765
766 if (copy_to_user(buffer, data, count))
767 return -EFAULT;
768
769 return count;
770 }
771
772 /* No kernel lock - fine */
773 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
774 {
775 struct mousedev_client *client = file->private_data;
776 struct mousedev *mousedev = client->mousedev;
777 unsigned int mask;
778
779 poll_wait(file, &mousedev->wait, wait);
780
781 mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
782 if (client->ready || client->buffer)
783 mask |= POLLIN | POLLRDNORM;
784
785 return mask;
786 }
787
788 static const struct file_operations mousedev_fops = {
789 .owner = THIS_MODULE,
790 .read = mousedev_read,
791 .write = mousedev_write,
792 .poll = mousedev_poll,
793 .open = mousedev_open,
794 .release = mousedev_release,
795 .fasync = mousedev_fasync,
796 .llseek = noop_llseek,
797 };
798
799 static int mousedev_install_chrdev(struct mousedev *mousedev)
800 {
801 mousedev_table[mousedev->minor] = mousedev;
802 return 0;
803 }
804
805 static void mousedev_remove_chrdev(struct mousedev *mousedev)
806 {
807 mutex_lock(&mousedev_table_mutex);
808 mousedev_table[mousedev->minor] = NULL;
809 mutex_unlock(&mousedev_table_mutex);
810 }
811
812 /*
813 * Mark device non-existent. This disables writes, ioctls and
814 * prevents new users from opening the device. Already posted
815 * blocking reads will stay, however new ones will fail.
816 */
817 static void mousedev_mark_dead(struct mousedev *mousedev)
818 {
819 mutex_lock(&mousedev->mutex);
820 mousedev->exist = false;
821 mutex_unlock(&mousedev->mutex);
822 }
823
824 /*
825 * Wake up users waiting for IO so they can disconnect from
826 * dead device.
827 */
828 static void mousedev_hangup(struct mousedev *mousedev)
829 {
830 struct mousedev_client *client;
831
832 spin_lock(&mousedev->client_lock);
833 list_for_each_entry(client, &mousedev->client_list, node)
834 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
835 spin_unlock(&mousedev->client_lock);
836
837 wake_up_interruptible(&mousedev->wait);
838 }
839
840 static void mousedev_cleanup(struct mousedev *mousedev)
841 {
842 struct input_handle *handle = &mousedev->handle;
843
844 mousedev_mark_dead(mousedev);
845 mousedev_hangup(mousedev);
846 mousedev_remove_chrdev(mousedev);
847
848 /* mousedev is marked dead so no one else accesses mousedev->open */
849 if (mousedev->open)
850 input_close_device(handle);
851 }
852
853 static struct mousedev *mousedev_create(struct input_dev *dev,
854 struct input_handler *handler,
855 int minor)
856 {
857 struct mousedev *mousedev;
858 int error;
859
860 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
861 if (!mousedev) {
862 error = -ENOMEM;
863 goto err_out;
864 }
865
866 INIT_LIST_HEAD(&mousedev->client_list);
867 INIT_LIST_HEAD(&mousedev->mixdev_node);
868 spin_lock_init(&mousedev->client_lock);
869 mutex_init(&mousedev->mutex);
870 lockdep_set_subclass(&mousedev->mutex,
871 minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0);
872 init_waitqueue_head(&mousedev->wait);
873
874 if (minor == MOUSEDEV_MIX)
875 dev_set_name(&mousedev->dev, "mice");
876 else
877 dev_set_name(&mousedev->dev, "mouse%d", minor);
878
879 mousedev->minor = minor;
880 mousedev->exist = true;
881 mousedev->handle.dev = input_get_device(dev);
882 mousedev->handle.name = dev_name(&mousedev->dev);
883 mousedev->handle.handler = handler;
884 mousedev->handle.private = mousedev;
885
886 mousedev->dev.class = &input_class;
887 if (dev)
888 mousedev->dev.parent = &dev->dev;
889 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
890 mousedev->dev.release = mousedev_free;
891 device_initialize(&mousedev->dev);
892
893 if (minor != MOUSEDEV_MIX) {
894 error = input_register_handle(&mousedev->handle);
895 if (error)
896 goto err_free_mousedev;
897 }
898
899 error = mousedev_install_chrdev(mousedev);
900 if (error)
901 goto err_unregister_handle;
902
903 error = device_add(&mousedev->dev);
904 if (error)
905 goto err_cleanup_mousedev;
906
907 return mousedev;
908
909 err_cleanup_mousedev:
910 mousedev_cleanup(mousedev);
911 err_unregister_handle:
912 if (minor != MOUSEDEV_MIX)
913 input_unregister_handle(&mousedev->handle);
914 err_free_mousedev:
915 put_device(&mousedev->dev);
916 err_out:
917 return ERR_PTR(error);
918 }
919
920 static void mousedev_destroy(struct mousedev *mousedev)
921 {
922 device_del(&mousedev->dev);
923 mousedev_cleanup(mousedev);
924 if (mousedev->minor != MOUSEDEV_MIX)
925 input_unregister_handle(&mousedev->handle);
926 put_device(&mousedev->dev);
927 }
928
929 static int mixdev_add_device(struct mousedev *mousedev)
930 {
931 int retval;
932
933 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
934 if (retval)
935 return retval;
936
937 if (mousedev_mix->open) {
938 retval = mousedev_open_device(mousedev);
939 if (retval)
940 goto out;
941
942 mousedev->mixdev_open = 1;
943 }
944
945 get_device(&mousedev->dev);
946 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
947
948 out:
949 mutex_unlock(&mousedev_mix->mutex);
950 return retval;
951 }
952
953 static void mixdev_remove_device(struct mousedev *mousedev)
954 {
955 mutex_lock(&mousedev_mix->mutex);
956
957 if (mousedev->mixdev_open) {
958 mousedev->mixdev_open = 0;
959 mousedev_close_device(mousedev);
960 }
961
962 list_del_init(&mousedev->mixdev_node);
963 mutex_unlock(&mousedev_mix->mutex);
964
965 put_device(&mousedev->dev);
966 }
967
968 static int mousedev_connect(struct input_handler *handler,
969 struct input_dev *dev,
970 const struct input_device_id *id)
971 {
972 struct mousedev *mousedev;
973 int minor;
974 int error;
975
976 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
977 if (!mousedev_table[minor])
978 break;
979
980 if (minor == MOUSEDEV_MINORS) {
981 pr_err("no more free mousedev devices\n");
982 return -ENFILE;
983 }
984
985 mousedev = mousedev_create(dev, handler, minor);
986 if (IS_ERR(mousedev))
987 return PTR_ERR(mousedev);
988
989 error = mixdev_add_device(mousedev);
990 if (error) {
991 mousedev_destroy(mousedev);
992 return error;
993 }
994
995 return 0;
996 }
997
998 static void mousedev_disconnect(struct input_handle *handle)
999 {
1000 struct mousedev *mousedev = handle->private;
1001
1002 mixdev_remove_device(mousedev);
1003 mousedev_destroy(mousedev);
1004 }
1005
1006 static const struct input_device_id mousedev_ids[] = {
1007 {
1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1009 INPUT_DEVICE_ID_MATCH_KEYBIT |
1010 INPUT_DEVICE_ID_MATCH_RELBIT,
1011 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1012 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1013 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
1014 }, /* A mouse like device, at least one button,
1015 two relative axes */
1016 {
1017 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1018 INPUT_DEVICE_ID_MATCH_RELBIT,
1019 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1020 .relbit = { BIT_MASK(REL_WHEEL) },
1021 }, /* A separate scrollwheel */
1022 {
1023 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1024 INPUT_DEVICE_ID_MATCH_KEYBIT |
1025 INPUT_DEVICE_ID_MATCH_ABSBIT,
1026 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1027 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1028 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1029 }, /* A tablet like device, at least touch detection,
1030 two absolute axes */
1031 {
1032 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1033 INPUT_DEVICE_ID_MATCH_KEYBIT |
1034 INPUT_DEVICE_ID_MATCH_ABSBIT,
1035 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1036 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1037 BIT_MASK(BTN_TOOL_FINGER) },
1038 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1039 BIT_MASK(ABS_PRESSURE) |
1040 BIT_MASK(ABS_TOOL_WIDTH) },
1041 }, /* A touchpad */
1042 {
1043 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1044 INPUT_DEVICE_ID_MATCH_KEYBIT |
1045 INPUT_DEVICE_ID_MATCH_ABSBIT,
1046 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1047 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1048 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1049 }, /* Mouse-like device with absolute X and Y but ordinary
1050 clicks, like hp ILO2 High Performance mouse */
1051
1052 { }, /* Terminating entry */
1053 };
1054
1055 MODULE_DEVICE_TABLE(input, mousedev_ids);
1056
1057 static struct input_handler mousedev_handler = {
1058 .event = mousedev_event,
1059 .connect = mousedev_connect,
1060 .disconnect = mousedev_disconnect,
1061 .fops = &mousedev_fops,
1062 .minor = MOUSEDEV_MINOR_BASE,
1063 .name = "mousedev",
1064 .id_table = mousedev_ids,
1065 };
1066
1067 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1068 static struct miscdevice psaux_mouse = {
1069 PSMOUSE_MINOR, "psaux", &mousedev_fops
1070 };
1071 static int psaux_registered;
1072 #endif
1073
1074 static int __init mousedev_init(void)
1075 {
1076 int error;
1077
1078 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1079 if (IS_ERR(mousedev_mix))
1080 return PTR_ERR(mousedev_mix);
1081
1082 error = input_register_handler(&mousedev_handler);
1083 if (error) {
1084 mousedev_destroy(mousedev_mix);
1085 return error;
1086 }
1087
1088 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1089 error = misc_register(&psaux_mouse);
1090 if (error)
1091 pr_warning("could not register psaux device, error: %d\n",
1092 error);
1093 else
1094 psaux_registered = 1;
1095 #endif
1096
1097 pr_info("PS/2 mouse device common for all mice\n");
1098
1099 return 0;
1100 }
1101
1102 static void __exit mousedev_exit(void)
1103 {
1104 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1105 if (psaux_registered)
1106 misc_deregister(&psaux_mouse);
1107 #endif
1108 input_unregister_handler(&mousedev_handler);
1109 mousedev_destroy(mousedev_mix);
1110 }
1111
1112 module_init(mousedev_init);
1113 module_exit(mousedev_exit);
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