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ARM: mach-shmobile: g3evm: Add IrDA support
[zen-stable.git] / drivers / input / mousedev.c
blobf34b22bce4ffb9ba9b2d5af62a237eda03f6241c
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 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
26 #include <linux/miscdevice.h>
27 #endif
28
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
31 MODULE_LICENSE("GPL");
32
33 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
34 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
35 #endif
36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
38 #endif
39
40 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
41 module_param(xres, uint, 0644);
42 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
43
44 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
45 module_param(yres, uint, 0644);
46 MODULE_PARM_DESC(yres, "Vertical screen resolution");
47
48 static unsigned tap_time = 200;
49 module_param(tap_time, uint, 0644);
50 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
51
52 struct mousedev_hw_data {
53 int dx, dy, dz;
54 int x, y;
55 int abs_event;
56 unsigned long buttons;
57 };
58
59 struct mousedev {
60 int exist;
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
70 struct list_head mixdev_node;
71 int mixdev_open;
72
73 struct mousedev_hw_data packet;
74 unsigned int pkt_count;
75 int old_x[4], old_y[4];
76 int frac_dx, frac_dy;
77 unsigned long touch;
78 };
79
80 enum mousedev_emul {
81 MOUSEDEV_EMUL_PS2,
82 MOUSEDEV_EMUL_IMPS,
83 MOUSEDEV_EMUL_EXPS
84 };
85
86 struct mousedev_motion {
87 int dx, dy, dz;
88 unsigned long buttons;
89 };
90
91 #define PACKET_QUEUE_LEN 16
92 struct mousedev_client {
93 struct fasync_struct *fasync;
94 struct mousedev *mousedev;
95 struct list_head node;
96
97 struct mousedev_motion packets[PACKET_QUEUE_LEN];
98 unsigned int head, tail;
99 spinlock_t packet_lock;
100 int pos_x, pos_y;
101
102 signed char ps2[6];
103 unsigned char ready, buffer, bufsiz;
104 unsigned char imexseq, impsseq;
105 enum mousedev_emul mode;
106 unsigned long last_buttons;
107 };
108
109 #define MOUSEDEV_SEQ_LEN 6
110
111 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
112 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
113
114 static struct input_handler mousedev_handler;
115
116 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
117 static DEFINE_MUTEX(mousedev_table_mutex);
118 static struct mousedev *mousedev_mix;
119 static LIST_HEAD(mousedev_mix_list);
120
121 static void mixdev_open_devices(void);
122 static void mixdev_close_devices(void);
123
124 #define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
125 #define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
126
127 static void mousedev_touchpad_event(struct input_dev *dev,
128 struct mousedev *mousedev,
129 unsigned int code, int value)
130 {
131 int size, tmp;
132 enum { FRACTION_DENOM = 128 };
133
134 switch (code) {
135
136 case ABS_X:
137 fx(0) = value;
138 if (mousedev->touch && mousedev->pkt_count >= 2) {
139 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
140 if (size == 0)
141 size = 256 * 2;
142 tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
143 tmp += mousedev->frac_dx;
144 mousedev->packet.dx = tmp / FRACTION_DENOM;
145 mousedev->frac_dx =
146 tmp - mousedev->packet.dx * FRACTION_DENOM;
147 }
148 break;
149
150 case ABS_Y:
151 fy(0) = value;
152 if (mousedev->touch && mousedev->pkt_count >= 2) {
153 /* use X size to keep the same scale */
154 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
155 if (size == 0)
156 size = 256 * 2;
157 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
158 tmp += mousedev->frac_dy;
159 mousedev->packet.dy = tmp / FRACTION_DENOM;
160 mousedev->frac_dy = tmp -
161 mousedev->packet.dy * FRACTION_DENOM;
162 }
163 break;
164 }
165 }
166
167 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
168 unsigned int code, int value)
169 {
170 int size;
171
172 switch (code) {
173
174 case ABS_X:
175 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
176 if (size == 0)
177 size = xres ? : 1;
178 if (value > dev->absmax[ABS_X])
179 value = dev->absmax[ABS_X];
180 if (value < dev->absmin[ABS_X])
181 value = dev->absmin[ABS_X];
182 mousedev->packet.x =
183 ((value - dev->absmin[ABS_X]) * xres) / size;
184 mousedev->packet.abs_event = 1;
185 break;
186
187 case ABS_Y:
188 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
189 if (size == 0)
190 size = yres ? : 1;
191 if (value > dev->absmax[ABS_Y])
192 value = dev->absmax[ABS_Y];
193 if (value < dev->absmin[ABS_Y])
194 value = dev->absmin[ABS_Y];
195 mousedev->packet.y = yres -
196 ((value - dev->absmin[ABS_Y]) * yres) / size;
197 mousedev->packet.abs_event = 1;
198 break;
199 }
200 }
201
202 static void mousedev_rel_event(struct mousedev *mousedev,
203 unsigned int code, int value)
204 {
205 switch (code) {
206 case REL_X:
207 mousedev->packet.dx += value;
208 break;
209
210 case REL_Y:
211 mousedev->packet.dy -= value;
212 break;
213
214 case REL_WHEEL:
215 mousedev->packet.dz -= value;
216 break;
217 }
218 }
219
220 static void mousedev_key_event(struct mousedev *mousedev,
221 unsigned int code, int value)
222 {
223 int index;
224
225 switch (code) {
226
227 case BTN_TOUCH:
228 case BTN_0:
229 case BTN_LEFT: index = 0; break;
230
231 case BTN_STYLUS:
232 case BTN_1:
233 case BTN_RIGHT: index = 1; break;
234
235 case BTN_2:
236 case BTN_FORWARD:
237 case BTN_STYLUS2:
238 case BTN_MIDDLE: index = 2; break;
239
240 case BTN_3:
241 case BTN_BACK:
242 case BTN_SIDE: index = 3; break;
243
244 case BTN_4:
245 case BTN_EXTRA: index = 4; break;
246
247 default: return;
248 }
249
250 if (value) {
251 set_bit(index, &mousedev->packet.buttons);
252 set_bit(index, &mousedev_mix->packet.buttons);
253 } else {
254 clear_bit(index, &mousedev->packet.buttons);
255 clear_bit(index, &mousedev_mix->packet.buttons);
256 }
257 }
258
259 static void mousedev_notify_readers(struct mousedev *mousedev,
260 struct mousedev_hw_data *packet)
261 {
262 struct mousedev_client *client;
263 struct mousedev_motion *p;
264 unsigned int new_head;
265 int wake_readers = 0;
266
267 rcu_read_lock();
268 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
269
270 /* Just acquire the lock, interrupts already disabled */
271 spin_lock(&client->packet_lock);
272
273 p = &client->packets[client->head];
274 if (client->ready && p->buttons != mousedev->packet.buttons) {
275 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
276 if (new_head != client->tail) {
277 p = &client->packets[client->head = new_head];
278 memset(p, 0, sizeof(struct mousedev_motion));
279 }
280 }
281
282 if (packet->abs_event) {
283 p->dx += packet->x - client->pos_x;
284 p->dy += packet->y - client->pos_y;
285 client->pos_x = packet->x;
286 client->pos_y = packet->y;
287 }
288
289 client->pos_x += packet->dx;
290 client->pos_x = client->pos_x < 0 ?
291 0 : (client->pos_x >= xres ? xres : client->pos_x);
292 client->pos_y += packet->dy;
293 client->pos_y = client->pos_y < 0 ?
294 0 : (client->pos_y >= yres ? yres : client->pos_y);
295
296 p->dx += packet->dx;
297 p->dy += packet->dy;
298 p->dz += packet->dz;
299 p->buttons = mousedev->packet.buttons;
300
301 if (p->dx || p->dy || p->dz ||
302 p->buttons != client->last_buttons)
303 client->ready = 1;
304
305 spin_unlock(&client->packet_lock);
306
307 if (client->ready) {
308 kill_fasync(&client->fasync, SIGIO, POLL_IN);
309 wake_readers = 1;
310 }
311 }
312 rcu_read_unlock();
313
314 if (wake_readers)
315 wake_up_interruptible(&mousedev->wait);
316 }
317
318 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
319 {
320 if (!value) {
321 if (mousedev->touch &&
322 time_before(jiffies,
323 mousedev->touch + msecs_to_jiffies(tap_time))) {
324 /*
325 * Toggle left button to emulate tap.
326 * We rely on the fact that mousedev_mix always has 0
327 * motion packet so we won't mess current position.
328 */
329 set_bit(0, &mousedev->packet.buttons);
330 set_bit(0, &mousedev_mix->packet.buttons);
331 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
332 mousedev_notify_readers(mousedev_mix,
333 &mousedev_mix->packet);
334 clear_bit(0, &mousedev->packet.buttons);
335 clear_bit(0, &mousedev_mix->packet.buttons);
336 }
337 mousedev->touch = mousedev->pkt_count = 0;
338 mousedev->frac_dx = 0;
339 mousedev->frac_dy = 0;
340
341 } else if (!mousedev->touch)
342 mousedev->touch = jiffies;
343 }
344
345 static void mousedev_event(struct input_handle *handle,
346 unsigned int type, unsigned int code, int value)
347 {
348 struct mousedev *mousedev = handle->private;
349
350 switch (type) {
351
352 case EV_ABS:
353 /* Ignore joysticks */
354 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
355 return;
356
357 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
358 mousedev_touchpad_event(handle->dev,
359 mousedev, code, value);
360 else
361 mousedev_abs_event(handle->dev, mousedev, code, value);
362
363 break;
364
365 case EV_REL:
366 mousedev_rel_event(mousedev, code, value);
367 break;
368
369 case EV_KEY:
370 if (value != 2) {
371 if (code == BTN_TOUCH &&
372 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
373 mousedev_touchpad_touch(mousedev, value);
374 else
375 mousedev_key_event(mousedev, code, value);
376 }
377 break;
378
379 case EV_SYN:
380 if (code == SYN_REPORT) {
381 if (mousedev->touch) {
382 mousedev->pkt_count++;
383 /*
384 * Input system eats duplicate events,
385 * but we need all of them to do correct
386 * averaging so apply present one forward
387 */
388 fx(0) = fx(1);
389 fy(0) = fy(1);
390 }
391
392 mousedev_notify_readers(mousedev, &mousedev->packet);
393 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
394
395 mousedev->packet.dx = mousedev->packet.dy =
396 mousedev->packet.dz = 0;
397 mousedev->packet.abs_event = 0;
398 }
399 break;
400 }
401 }
402
403 static int mousedev_fasync(int fd, struct file *file, int on)
404 {
405 struct mousedev_client *client = file->private_data;
406
407 return fasync_helper(fd, file, on, &client->fasync);
408 }
409
410 static void mousedev_free(struct device *dev)
411 {
412 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
413
414 input_put_device(mousedev->handle.dev);
415 kfree(mousedev);
416 }
417
418 static int mousedev_open_device(struct mousedev *mousedev)
419 {
420 int retval;
421
422 retval = mutex_lock_interruptible(&mousedev->mutex);
423 if (retval)
424 return retval;
425
426 if (mousedev->minor == MOUSEDEV_MIX)
427 mixdev_open_devices();
428 else if (!mousedev->exist)
429 retval = -ENODEV;
430 else if (!mousedev->open++) {
431 retval = input_open_device(&mousedev->handle);
432 if (retval)
433 mousedev->open--;
434 }
435
436 mutex_unlock(&mousedev->mutex);
437 return retval;
438 }
439
440 static void mousedev_close_device(struct mousedev *mousedev)
441 {
442 mutex_lock(&mousedev->mutex);
443
444 if (mousedev->minor == MOUSEDEV_MIX)
445 mixdev_close_devices();
446 else 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 void mixdev_open_devices(void)
458 {
459 struct mousedev *mousedev;
460
461 if (mousedev_mix->open++)
462 return;
463
464 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
465 if (!mousedev->mixdev_open) {
466 if (mousedev_open_device(mousedev))
467 continue;
468
469 mousedev->mixdev_open = 1;
470 }
471 }
472 }
473
474 /*
475 * Close all devices that were opened as part of multiplexed
476 * device. Note that this function is called with mousedev_mix->mutex
477 * held.
478 */
479 static void mixdev_close_devices(void)
480 {
481 struct mousedev *mousedev;
482
483 if (--mousedev_mix->open)
484 return;
485
486 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
487 if (mousedev->mixdev_open) {
488 mousedev->mixdev_open = 0;
489 mousedev_close_device(mousedev);
490 }
491 }
492 }
493
494
495 static void mousedev_attach_client(struct mousedev *mousedev,
496 struct mousedev_client *client)
497 {
498 spin_lock(&mousedev->client_lock);
499 list_add_tail_rcu(&client->node, &mousedev->client_list);
500 spin_unlock(&mousedev->client_lock);
501 synchronize_rcu();
502 }
503
504 static void mousedev_detach_client(struct mousedev *mousedev,
505 struct mousedev_client *client)
506 {
507 spin_lock(&mousedev->client_lock);
508 list_del_rcu(&client->node);
509 spin_unlock(&mousedev->client_lock);
510 synchronize_rcu();
511 }
512
513 static int mousedev_release(struct inode *inode, struct file *file)
514 {
515 struct mousedev_client *client = file->private_data;
516 struct mousedev *mousedev = client->mousedev;
517
518 mousedev_detach_client(mousedev, client);
519 kfree(client);
520
521 mousedev_close_device(mousedev);
522 put_device(&mousedev->dev);
523
524 return 0;
525 }
526
527 static int mousedev_open(struct inode *inode, struct file *file)
528 {
529 struct mousedev_client *client;
530 struct mousedev *mousedev;
531 int error;
532 int i;
533
534 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
535 if (imajor(inode) == MISC_MAJOR)
536 i = MOUSEDEV_MIX;
537 else
538 #endif
539 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
540
541 if (i >= MOUSEDEV_MINORS)
542 return -ENODEV;
543
544 error = mutex_lock_interruptible(&mousedev_table_mutex);
545 if (error) {
546 return error;
547 }
548 mousedev = mousedev_table[i];
549 if (mousedev)
550 get_device(&mousedev->dev);
551 mutex_unlock(&mousedev_table_mutex);
552
553 if (!mousedev) {
554 return -ENODEV;
555 }
556
557 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
558 if (!client) {
559 error = -ENOMEM;
560 goto err_put_mousedev;
561 }
562
563 spin_lock_init(&client->packet_lock);
564 client->pos_x = xres / 2;
565 client->pos_y = yres / 2;
566 client->mousedev = mousedev;
567 mousedev_attach_client(mousedev, client);
568
569 error = mousedev_open_device(mousedev);
570 if (error)
571 goto err_free_client;
572
573 file->private_data = client;
574 return 0;
575
576 err_free_client:
577 mousedev_detach_client(mousedev, client);
578 kfree(client);
579 err_put_mousedev:
580 put_device(&mousedev->dev);
581 return error;
582 }
583
584 static inline int mousedev_limit_delta(int delta, int limit)
585 {
586 return delta > limit ? limit : (delta < -limit ? -limit : delta);
587 }
588
589 static void mousedev_packet(struct mousedev_client *client,
590 signed char *ps2_data)
591 {
592 struct mousedev_motion *p = &client->packets[client->tail];
593
594 ps2_data[0] = 0x08 |
595 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
596 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
597 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
598 p->dx -= ps2_data[1];
599 p->dy -= ps2_data[2];
600
601 switch (client->mode) {
602 case MOUSEDEV_EMUL_EXPS:
603 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
604 p->dz -= ps2_data[3];
605 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
606 client->bufsiz = 4;
607 break;
608
609 case MOUSEDEV_EMUL_IMPS:
610 ps2_data[0] |=
611 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
612 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
613 p->dz -= ps2_data[3];
614 client->bufsiz = 4;
615 break;
616
617 case MOUSEDEV_EMUL_PS2:
618 default:
619 ps2_data[0] |=
620 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
621 p->dz = 0;
622 client->bufsiz = 3;
623 break;
624 }
625
626 if (!p->dx && !p->dy && !p->dz) {
627 if (client->tail == client->head) {
628 client->ready = 0;
629 client->last_buttons = p->buttons;
630 } else
631 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
632 }
633 }
634
635 static void mousedev_generate_response(struct mousedev_client *client,
636 int command)
637 {
638 client->ps2[0] = 0xfa; /* ACK */
639
640 switch (command) {
641
642 case 0xeb: /* Poll */
643 mousedev_packet(client, &client->ps2[1]);
644 client->bufsiz++; /* account for leading ACK */
645 break;
646
647 case 0xf2: /* Get ID */
648 switch (client->mode) {
649 case MOUSEDEV_EMUL_PS2:
650 client->ps2[1] = 0;
651 break;
652 case MOUSEDEV_EMUL_IMPS:
653 client->ps2[1] = 3;
654 break;
655 case MOUSEDEV_EMUL_EXPS:
656 client->ps2[1] = 4;
657 break;
658 }
659 client->bufsiz = 2;
660 break;
661
662 case 0xe9: /* Get info */
663 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
664 client->bufsiz = 4;
665 break;
666
667 case 0xff: /* Reset */
668 client->impsseq = client->imexseq = 0;
669 client->mode = MOUSEDEV_EMUL_PS2;
670 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
671 client->bufsiz = 3;
672 break;
673
674 default:
675 client->bufsiz = 1;
676 break;
677 }
678 client->buffer = client->bufsiz;
679 }
680
681 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
682 size_t count, loff_t *ppos)
683 {
684 struct mousedev_client *client = file->private_data;
685 unsigned char c;
686 unsigned int i;
687
688 for (i = 0; i < count; i++) {
689
690 if (get_user(c, buffer + i))
691 return -EFAULT;
692
693 spin_lock_irq(&client->packet_lock);
694
695 if (c == mousedev_imex_seq[client->imexseq]) {
696 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
697 client->imexseq = 0;
698 client->mode = MOUSEDEV_EMUL_EXPS;
699 }
700 } else
701 client->imexseq = 0;
702
703 if (c == mousedev_imps_seq[client->impsseq]) {
704 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
705 client->impsseq = 0;
706 client->mode = MOUSEDEV_EMUL_IMPS;
707 }
708 } else
709 client->impsseq = 0;
710
711 mousedev_generate_response(client, c);
712
713 spin_unlock_irq(&client->packet_lock);
714 }
715
716 kill_fasync(&client->fasync, SIGIO, POLL_IN);
717 wake_up_interruptible(&client->mousedev->wait);
718
719 return count;
720 }
721
722 static ssize_t mousedev_read(struct file *file, char __user *buffer,
723 size_t count, loff_t *ppos)
724 {
725 struct mousedev_client *client = file->private_data;
726 struct mousedev *mousedev = client->mousedev;
727 signed char data[sizeof(client->ps2)];
728 int retval = 0;
729
730 if (!client->ready && !client->buffer && mousedev->exist &&
731 (file->f_flags & O_NONBLOCK))
732 return -EAGAIN;
733
734 retval = wait_event_interruptible(mousedev->wait,
735 !mousedev->exist || client->ready || client->buffer);
736 if (retval)
737 return retval;
738
739 if (!mousedev->exist)
740 return -ENODEV;
741
742 spin_lock_irq(&client->packet_lock);
743
744 if (!client->buffer && client->ready) {
745 mousedev_packet(client, client->ps2);
746 client->buffer = client->bufsiz;
747 }
748
749 if (count > client->buffer)
750 count = client->buffer;
751
752 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
753 client->buffer -= count;
754
755 spin_unlock_irq(&client->packet_lock);
756
757 if (copy_to_user(buffer, data, count))
758 return -EFAULT;
759
760 return count;
761 }
762
763 /* No kernel lock - fine */
764 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
765 {
766 struct mousedev_client *client = file->private_data;
767 struct mousedev *mousedev = client->mousedev;
768
769 poll_wait(file, &mousedev->wait, wait);
770 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
771 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
772 }
773
774 static const struct file_operations mousedev_fops = {
775 .owner = THIS_MODULE,
776 .read = mousedev_read,
777 .write = mousedev_write,
778 .poll = mousedev_poll,
779 .open = mousedev_open,
780 .release = mousedev_release,
781 .fasync = mousedev_fasync,
782 };
783
784 static int mousedev_install_chrdev(struct mousedev *mousedev)
785 {
786 mousedev_table[mousedev->minor] = mousedev;
787 return 0;
788 }
789
790 static void mousedev_remove_chrdev(struct mousedev *mousedev)
791 {
792 mutex_lock(&mousedev_table_mutex);
793 mousedev_table[mousedev->minor] = NULL;
794 mutex_unlock(&mousedev_table_mutex);
795 }
796
797 /*
798 * Mark device non-existent. This disables writes, ioctls and
799 * prevents new users from opening the device. Already posted
800 * blocking reads will stay, however new ones will fail.
801 */
802 static void mousedev_mark_dead(struct mousedev *mousedev)
803 {
804 mutex_lock(&mousedev->mutex);
805 mousedev->exist = 0;
806 mutex_unlock(&mousedev->mutex);
807 }
808
809 /*
810 * Wake up users waiting for IO so they can disconnect from
811 * dead device.
812 */
813 static void mousedev_hangup(struct mousedev *mousedev)
814 {
815 struct mousedev_client *client;
816
817 spin_lock(&mousedev->client_lock);
818 list_for_each_entry(client, &mousedev->client_list, node)
819 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
820 spin_unlock(&mousedev->client_lock);
821
822 wake_up_interruptible(&mousedev->wait);
823 }
824
825 static void mousedev_cleanup(struct mousedev *mousedev)
826 {
827 struct input_handle *handle = &mousedev->handle;
828
829 mousedev_mark_dead(mousedev);
830 mousedev_hangup(mousedev);
831 mousedev_remove_chrdev(mousedev);
832
833 /* mousedev is marked dead so no one else accesses mousedev->open */
834 if (mousedev->open)
835 input_close_device(handle);
836 }
837
838 static struct mousedev *mousedev_create(struct input_dev *dev,
839 struct input_handler *handler,
840 int minor)
841 {
842 struct mousedev *mousedev;
843 int error;
844
845 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
846 if (!mousedev) {
847 error = -ENOMEM;
848 goto err_out;
849 }
850
851 INIT_LIST_HEAD(&mousedev->client_list);
852 INIT_LIST_HEAD(&mousedev->mixdev_node);
853 spin_lock_init(&mousedev->client_lock);
854 mutex_init(&mousedev->mutex);
855 lockdep_set_subclass(&mousedev->mutex,
856 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
857 init_waitqueue_head(&mousedev->wait);
858
859 if (minor == MOUSEDEV_MIX)
860 dev_set_name(&mousedev->dev, "mice");
861 else
862 dev_set_name(&mousedev->dev, "mouse%d", minor);
863
864 mousedev->minor = minor;
865 mousedev->exist = 1;
866 mousedev->handle.dev = input_get_device(dev);
867 mousedev->handle.name = dev_name(&mousedev->dev);
868 mousedev->handle.handler = handler;
869 mousedev->handle.private = mousedev;
870
871 mousedev->dev.class = &input_class;
872 if (dev)
873 mousedev->dev.parent = &dev->dev;
874 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
875 mousedev->dev.release = mousedev_free;
876 device_initialize(&mousedev->dev);
877
878 if (minor != MOUSEDEV_MIX) {
879 error = input_register_handle(&mousedev->handle);
880 if (error)
881 goto err_free_mousedev;
882 }
883
884 error = mousedev_install_chrdev(mousedev);
885 if (error)
886 goto err_unregister_handle;
887
888 error = device_add(&mousedev->dev);
889 if (error)
890 goto err_cleanup_mousedev;
891
892 return mousedev;
893
894 err_cleanup_mousedev:
895 mousedev_cleanup(mousedev);
896 err_unregister_handle:
897 if (minor != MOUSEDEV_MIX)
898 input_unregister_handle(&mousedev->handle);
899 err_free_mousedev:
900 put_device(&mousedev->dev);
901 err_out:
902 return ERR_PTR(error);
903 }
904
905 static void mousedev_destroy(struct mousedev *mousedev)
906 {
907 device_del(&mousedev->dev);
908 mousedev_cleanup(mousedev);
909 if (mousedev->minor != MOUSEDEV_MIX)
910 input_unregister_handle(&mousedev->handle);
911 put_device(&mousedev->dev);
912 }
913
914 static int mixdev_add_device(struct mousedev *mousedev)
915 {
916 int retval;
917
918 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
919 if (retval)
920 return retval;
921
922 if (mousedev_mix->open) {
923 retval = mousedev_open_device(mousedev);
924 if (retval)
925 goto out;
926
927 mousedev->mixdev_open = 1;
928 }
929
930 get_device(&mousedev->dev);
931 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
932
933 out:
934 mutex_unlock(&mousedev_mix->mutex);
935 return retval;
936 }
937
938 static void mixdev_remove_device(struct mousedev *mousedev)
939 {
940 mutex_lock(&mousedev_mix->mutex);
941
942 if (mousedev->mixdev_open) {
943 mousedev->mixdev_open = 0;
944 mousedev_close_device(mousedev);
945 }
946
947 list_del_init(&mousedev->mixdev_node);
948 mutex_unlock(&mousedev_mix->mutex);
949
950 put_device(&mousedev->dev);
951 }
952
953 static int mousedev_connect(struct input_handler *handler,
954 struct input_dev *dev,
955 const struct input_device_id *id)
956 {
957 struct mousedev *mousedev;
958 int minor;
959 int error;
960
961 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
962 if (!mousedev_table[minor])
963 break;
964
965 if (minor == MOUSEDEV_MINORS) {
966 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
967 return -ENFILE;
968 }
969
970 mousedev = mousedev_create(dev, handler, minor);
971 if (IS_ERR(mousedev))
972 return PTR_ERR(mousedev);
973
974 error = mixdev_add_device(mousedev);
975 if (error) {
976 mousedev_destroy(mousedev);
977 return error;
978 }
979
980 return 0;
981 }
982
983 static void mousedev_disconnect(struct input_handle *handle)
984 {
985 struct mousedev *mousedev = handle->private;
986
987 mixdev_remove_device(mousedev);
988 mousedev_destroy(mousedev);
989 }
990
991 static const struct input_device_id mousedev_ids[] = {
992 {
993 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
994 INPUT_DEVICE_ID_MATCH_KEYBIT |
995 INPUT_DEVICE_ID_MATCH_RELBIT,
996 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
997 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
998 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
999 }, /* A mouse like device, at least one button,
1000 two relative axes */
1001 {
1002 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1003 INPUT_DEVICE_ID_MATCH_RELBIT,
1004 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1005 .relbit = { BIT_MASK(REL_WHEEL) },
1006 }, /* A separate scrollwheel */
1007 {
1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1009 INPUT_DEVICE_ID_MATCH_KEYBIT |
1010 INPUT_DEVICE_ID_MATCH_ABSBIT,
1011 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1012 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1013 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1014 }, /* A tablet like device, at least touch detection,
1015 two absolute axes */
1016 {
1017 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1018 INPUT_DEVICE_ID_MATCH_KEYBIT |
1019 INPUT_DEVICE_ID_MATCH_ABSBIT,
1020 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1021 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1022 BIT_MASK(BTN_TOOL_FINGER) },
1023 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1024 BIT_MASK(ABS_PRESSURE) |
1025 BIT_MASK(ABS_TOOL_WIDTH) },
1026 }, /* A touchpad */
1027 {
1028 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1029 INPUT_DEVICE_ID_MATCH_KEYBIT |
1030 INPUT_DEVICE_ID_MATCH_ABSBIT,
1031 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1032 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1033 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1034 }, /* Mouse-like device with absolute X and Y but ordinary
1035 clicks, like hp ILO2 High Performance mouse */
1036
1037 { }, /* Terminating entry */
1038 };
1039
1040 MODULE_DEVICE_TABLE(input, mousedev_ids);
1041
1042 static struct input_handler mousedev_handler = {
1043 .event = mousedev_event,
1044 .connect = mousedev_connect,
1045 .disconnect = mousedev_disconnect,
1046 .fops = &mousedev_fops,
1047 .minor = MOUSEDEV_MINOR_BASE,
1048 .name = "mousedev",
1049 .id_table = mousedev_ids,
1050 };
1051
1052 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1053 static struct miscdevice psaux_mouse = {
1054 PSMOUSE_MINOR, "psaux", &mousedev_fops
1055 };
1056 static int psaux_registered;
1057 #endif
1058
1059 static int __init mousedev_init(void)
1060 {
1061 int error;
1062
1063 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1064 if (IS_ERR(mousedev_mix))
1065 return PTR_ERR(mousedev_mix);
1066
1067 error = input_register_handler(&mousedev_handler);
1068 if (error) {
1069 mousedev_destroy(mousedev_mix);
1070 return error;
1071 }
1072
1073 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1074 error = misc_register(&psaux_mouse);
1075 if (error)
1076 printk(KERN_WARNING "mice: could not register psaux device, "
1077 "error: %d\n", error);
1078 else
1079 psaux_registered = 1;
1080 #endif
1081
1082 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1083
1084 return 0;
1085 }
1086
1087 static void __exit mousedev_exit(void)
1088 {
1089 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1090 if (psaux_registered)
1091 misc_deregister(&psaux_mouse);
1092 #endif
1093 input_unregister_handler(&mousedev_handler);
1094 mousedev_destroy(mousedev_mix);
1095 }
1096
1097 module_init(mousedev_init);
1098 module_exit(mousedev_exit);