?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / input / mousedev.c
blob79146d6ed2ab2d392988d196d64d4f9d6c0e92bf
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/slab.h>
17 #include <linux/poll.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.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 char name[16];
64 struct input_handle handle;
65 wait_queue_head_t wait;
66 struct list_head client_list;
67 spinlock_t client_lock; /* protects client_list */
68 struct mutex mutex;
69 struct device dev;
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 fx(0) = value;
139 if (mousedev->touch && mousedev->pkt_count >= 2) {
140 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
141 if (size == 0)
142 size = 256 * 2;
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 to keep the same scale */
155 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
156 if (size == 0)
157 size = 256 * 2;
158 tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
159 tmp += mousedev->frac_dy;
160 mousedev->packet.dy = tmp / FRACTION_DENOM;
161 mousedev->frac_dy = tmp -
162 mousedev->packet.dy * FRACTION_DENOM;
163 }
164 break;
165 }
166 }
167
168 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
169 unsigned int code, int value)
170 {
171 int size;
172
173 switch (code) {
174
175 case ABS_X:
176 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
177 if (size == 0)
178 size = xres ? : 1;
179 if (value > dev->absmax[ABS_X])
180 value = dev->absmax[ABS_X];
181 if (value < dev->absmin[ABS_X])
182 value = dev->absmin[ABS_X];
183 mousedev->packet.x =
184 ((value - dev->absmin[ABS_X]) * xres) / size;
185 mousedev->packet.abs_event = 1;
186 break;
187
188 case ABS_Y:
189 size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
190 if (size == 0)
191 size = yres ? : 1;
192 if (value > dev->absmax[ABS_Y])
193 value = dev->absmax[ABS_Y];
194 if (value < dev->absmin[ABS_Y])
195 value = dev->absmin[ABS_Y];
196 mousedev->packet.y = yres -
197 ((value - dev->absmin[ABS_Y]) * yres) / size;
198 mousedev->packet.abs_event = 1;
199 break;
200 }
201 }
202
203 static void mousedev_rel_event(struct mousedev *mousedev,
204 unsigned int code, int value)
205 {
206 switch (code) {
207 case REL_X:
208 mousedev->packet.dx += value;
209 break;
210
211 case REL_Y:
212 mousedev->packet.dy -= value;
213 break;
214
215 case REL_WHEEL:
216 mousedev->packet.dz -= value;
217 break;
218 }
219 }
220
221 static void mousedev_key_event(struct mousedev *mousedev,
222 unsigned int code, int value)
223 {
224 int index;
225
226 switch (code) {
227
228 case BTN_TOUCH:
229 case BTN_0:
230 case BTN_LEFT: index = 0; break;
231
232 case BTN_STYLUS:
233 case BTN_1:
234 case BTN_RIGHT: index = 1; break;
235
236 case BTN_2:
237 case BTN_FORWARD:
238 case BTN_STYLUS2:
239 case BTN_MIDDLE: index = 2; break;
240
241 case BTN_3:
242 case BTN_BACK:
243 case BTN_SIDE: index = 3; break;
244
245 case BTN_4:
246 case BTN_EXTRA: index = 4; break;
247
248 default: return;
249 }
250
251 if (value) {
252 set_bit(index, &mousedev->packet.buttons);
253 set_bit(index, &mousedev_mix->packet.buttons);
254 } else {
255 clear_bit(index, &mousedev->packet.buttons);
256 clear_bit(index, &mousedev_mix->packet.buttons);
257 }
258 }
259
260 static void mousedev_notify_readers(struct mousedev *mousedev,
261 struct mousedev_hw_data *packet)
262 {
263 struct mousedev_client *client;
264 struct mousedev_motion *p;
265 unsigned int new_head;
266 int wake_readers = 0;
267
268 rcu_read_lock();
269 list_for_each_entry_rcu(client, &mousedev->client_list, node) {
270
271 /* Just acquire the lock, interrupts already disabled */
272 spin_lock(&client->packet_lock);
273
274 p = &client->packets[client->head];
275 if (client->ready && p->buttons != mousedev->packet.buttons) {
276 new_head = (client->head + 1) % PACKET_QUEUE_LEN;
277 if (new_head != client->tail) {
278 p = &client->packets[client->head = new_head];
279 memset(p, 0, sizeof(struct mousedev_motion));
280 }
281 }
282
283 if (packet->abs_event) {
284 p->dx += packet->x - client->pos_x;
285 p->dy += packet->y - client->pos_y;
286 client->pos_x = packet->x;
287 client->pos_y = packet->y;
288 }
289
290 client->pos_x += packet->dx;
291 client->pos_x = client->pos_x < 0 ?
292 0 : (client->pos_x >= xres ? xres : client->pos_x);
293 client->pos_y += packet->dy;
294 client->pos_y = client->pos_y < 0 ?
295 0 : (client->pos_y >= yres ? yres : client->pos_y);
296
297 p->dx += packet->dx;
298 p->dy += packet->dy;
299 p->dz += packet->dz;
300 p->buttons = mousedev->packet.buttons;
301
302 if (p->dx || p->dy || p->dz ||
303 p->buttons != client->last_buttons)
304 client->ready = 1;
305
306 spin_unlock(&client->packet_lock);
307
308 if (client->ready) {
309 kill_fasync(&client->fasync, SIGIO, POLL_IN);
310 wake_readers = 1;
311 }
312 }
313 rcu_read_unlock();
314
315 if (wake_readers)
316 wake_up_interruptible(&mousedev->wait);
317 }
318
319 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
320 {
321 if (!value) {
322 if (mousedev->touch &&
323 time_before(jiffies,
324 mousedev->touch + msecs_to_jiffies(tap_time))) {
325 /*
326 * Toggle left button to emulate tap.
327 * We rely on the fact that mousedev_mix always has 0
328 * motion packet so we won't mess current position.
329 */
330 set_bit(0, &mousedev->packet.buttons);
331 set_bit(0, &mousedev_mix->packet.buttons);
332 mousedev_notify_readers(mousedev, &mousedev_mix->packet);
333 mousedev_notify_readers(mousedev_mix,
334 &mousedev_mix->packet);
335 clear_bit(0, &mousedev->packet.buttons);
336 clear_bit(0, &mousedev_mix->packet.buttons);
337 }
338 mousedev->touch = mousedev->pkt_count = 0;
339 mousedev->frac_dx = 0;
340 mousedev->frac_dy = 0;
341
342 } else if (!mousedev->touch)
343 mousedev->touch = jiffies;
344 }
345
346 static void mousedev_event(struct input_handle *handle,
347 unsigned int type, unsigned int code, int value)
348 {
349 struct mousedev *mousedev = handle->private;
350
351 switch (type) {
352
353 case EV_ABS:
354 /* Ignore joysticks */
355 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
356 return;
357
358 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
359 mousedev_touchpad_event(handle->dev,
360 mousedev, code, value);
361 else
362 mousedev_abs_event(handle->dev, mousedev, code, value);
363
364 break;
365
366 case EV_REL:
367 mousedev_rel_event(mousedev, code, value);
368 break;
369
370 case EV_KEY:
371 if (value != 2) {
372 if (code == BTN_TOUCH &&
373 test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
374 mousedev_touchpad_touch(mousedev, value);
375 else
376 mousedev_key_event(mousedev, code, value);
377 }
378 break;
379
380 case EV_SYN:
381 if (code == SYN_REPORT) {
382 if (mousedev->touch) {
383 mousedev->pkt_count++;
384 /*
385 * Input system eats duplicate events,
386 * but we need all of them to do correct
387 * averaging so apply present one forward
388 */
389 fx(0) = fx(1);
390 fy(0) = fy(1);
391 }
392
393 mousedev_notify_readers(mousedev, &mousedev->packet);
394 mousedev_notify_readers(mousedev_mix, &mousedev->packet);
395
396 mousedev->packet.dx = mousedev->packet.dy =
397 mousedev->packet.dz = 0;
398 mousedev->packet.abs_event = 0;
399 }
400 break;
401 }
402 }
403
404 static int mousedev_fasync(int fd, struct file *file, int on)
405 {
406 int retval;
407 struct mousedev_client *client = file->private_data;
408
409 retval = fasync_helper(fd, file, on, &client->fasync);
410
411 return retval < 0 ? retval : 0;
412 }
413
414 static void mousedev_free(struct device *dev)
415 {
416 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
417
418 kfree(mousedev);
419 }
420
421 static int mousedev_open_device(struct mousedev *mousedev)
422 {
423 int retval;
424
425 retval = mutex_lock_interruptible(&mousedev->mutex);
426 if (retval)
427 return retval;
428
429 if (mousedev->minor == MOUSEDEV_MIX)
430 mixdev_open_devices();
431 else if (!mousedev->exist)
432 retval = -ENODEV;
433 else if (!mousedev->open++) {
434 retval = input_open_device(&mousedev->handle);
435 if (retval)
436 mousedev->open--;
437 }
438
439 mutex_unlock(&mousedev->mutex);
440 return retval;
441 }
442
443 static void mousedev_close_device(struct mousedev *mousedev)
444 {
445 mutex_lock(&mousedev->mutex);
446
447 if (mousedev->minor == MOUSEDEV_MIX)
448 mixdev_close_devices();
449 else if (mousedev->exist && !--mousedev->open)
450 input_close_device(&mousedev->handle);
451
452 mutex_unlock(&mousedev->mutex);
453 }
454
455 /*
456 * Open all available devices so they can all be multiplexed in one.
457 * stream. Note that this function is called with mousedev_mix->mutex
458 * held.
459 */
460 static void mixdev_open_devices(void)
461 {
462 struct mousedev *mousedev;
463
464 if (mousedev_mix->open++)
465 return;
466
467 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
468 if (!mousedev->mixdev_open) {
469 if (mousedev_open_device(mousedev))
470 continue;
471
472 mousedev->mixdev_open = 1;
473 }
474 }
475 }
476
477 /*
478 * Close all devices that were opened as part of multiplexed
479 * device. Note that this function is called with mousedev_mix->mutex
480 * held.
481 */
482 static void mixdev_close_devices(void)
483 {
484 struct mousedev *mousedev;
485
486 if (--mousedev_mix->open)
487 return;
488
489 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
490 if (mousedev->mixdev_open) {
491 mousedev->mixdev_open = 0;
492 mousedev_close_device(mousedev);
493 }
494 }
495 }
496
497
498 static void mousedev_attach_client(struct mousedev *mousedev,
499 struct mousedev_client *client)
500 {
501 spin_lock(&mousedev->client_lock);
502 list_add_tail_rcu(&client->node, &mousedev->client_list);
503 spin_unlock(&mousedev->client_lock);
504 synchronize_rcu();
505 }
506
507 static void mousedev_detach_client(struct mousedev *mousedev,
508 struct mousedev_client *client)
509 {
510 spin_lock(&mousedev->client_lock);
511 list_del_rcu(&client->node);
512 spin_unlock(&mousedev->client_lock);
513 synchronize_rcu();
514 }
515
516 static int mousedev_release(struct inode *inode, struct file *file)
517 {
518 struct mousedev_client *client = file->private_data;
519 struct mousedev *mousedev = client->mousedev;
520
521 mousedev_fasync(-1, file, 0);
522 mousedev_detach_client(mousedev, client);
523 kfree(client);
524
525 mousedev_close_device(mousedev);
526 put_device(&mousedev->dev);
527
528 return 0;
529 }
530
531 static int mousedev_open(struct inode *inode, struct file *file)
532 {
533 struct mousedev_client *client;
534 struct mousedev *mousedev;
535 int error;
536 int i;
537
538 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
539 if (imajor(inode) == MISC_MAJOR)
540 i = MOUSEDEV_MIX;
541 else
542 #endif
543 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
544
545 if (i >= MOUSEDEV_MINORS)
546 return -ENODEV;
547
548 error = mutex_lock_interruptible(&mousedev_table_mutex);
549 if (error)
550 return error;
551 mousedev = mousedev_table[i];
552 if (mousedev)
553 get_device(&mousedev->dev);
554 mutex_unlock(&mousedev_table_mutex);
555
556 if (!mousedev)
557 return -ENODEV;
558
559 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
560 if (!client) {
561 error = -ENOMEM;
562 goto err_put_mousedev;
563 }
564
565 spin_lock_init(&client->packet_lock);
566 client->pos_x = xres / 2;
567 client->pos_y = yres / 2;
568 client->mousedev = mousedev;
569 mousedev_attach_client(mousedev, client);
570
571 error = mousedev_open_device(mousedev);
572 if (error)
573 goto err_free_client;
574
575 file->private_data = client;
576 return 0;
577
578 err_free_client:
579 mousedev_detach_client(mousedev, client);
580 kfree(client);
581 err_put_mousedev:
582 put_device(&mousedev->dev);
583 return error;
584 }
585
586 static inline int mousedev_limit_delta(int delta, int limit)
587 {
588 return delta > limit ? limit : (delta < -limit ? -limit : delta);
589 }
590
591 static void mousedev_packet(struct mousedev_client *client,
592 signed char *ps2_data)
593 {
594 struct mousedev_motion *p = &client->packets[client->tail];
595
596 ps2_data[0] = 0x08 |
597 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
598 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
599 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
600 p->dx -= ps2_data[1];
601 p->dy -= ps2_data[2];
602
603 switch (client->mode) {
604 case MOUSEDEV_EMUL_EXPS:
605 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
606 p->dz -= ps2_data[3];
607 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
608 client->bufsiz = 4;
609 break;
610
611 case MOUSEDEV_EMUL_IMPS:
612 ps2_data[0] |=
613 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
614 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
615 p->dz -= ps2_data[3];
616 client->bufsiz = 4;
617 break;
618
619 case MOUSEDEV_EMUL_PS2:
620 default:
621 ps2_data[0] |=
622 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
623 p->dz = 0;
624 client->bufsiz = 3;
625 break;
626 }
627
628 if (!p->dx && !p->dy && !p->dz) {
629 if (client->tail == client->head) {
630 client->ready = 0;
631 client->last_buttons = p->buttons;
632 } else
633 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
634 }
635 }
636
637 static void mousedev_generate_response(struct mousedev_client *client,
638 int command)
639 {
640 client->ps2[0] = 0xfa; /* ACK */
641
642 switch (command) {
643
644 case 0xeb: /* Poll */
645 mousedev_packet(client, &client->ps2[1]);
646 client->bufsiz++; /* account for leading ACK */
647 break;
648
649 case 0xf2: /* Get ID */
650 switch (client->mode) {
651 case MOUSEDEV_EMUL_PS2:
652 client->ps2[1] = 0;
653 break;
654 case MOUSEDEV_EMUL_IMPS:
655 client->ps2[1] = 3;
656 break;
657 case MOUSEDEV_EMUL_EXPS:
658 client->ps2[1] = 4;
659 break;
660 }
661 client->bufsiz = 2;
662 break;
663
664 case 0xe9: /* Get info */
665 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
666 client->bufsiz = 4;
667 break;
668
669 case 0xff: /* Reset */
670 client->impsseq = client->imexseq = 0;
671 client->mode = MOUSEDEV_EMUL_PS2;
672 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
673 client->bufsiz = 3;
674 break;
675
676 default:
677 client->bufsiz = 1;
678 break;
679 }
680 client->buffer = client->bufsiz;
681 }
682
683 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
684 size_t count, loff_t *ppos)
685 {
686 struct mousedev_client *client = file->private_data;
687 unsigned char c;
688 unsigned int i;
689
690 for (i = 0; i < count; i++) {
691
692 if (get_user(c, buffer + i))
693 return -EFAULT;
694
695 spin_lock_irq(&client->packet_lock);
696
697 if (c == mousedev_imex_seq[client->imexseq]) {
698 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
699 client->imexseq = 0;
700 client->mode = MOUSEDEV_EMUL_EXPS;
701 }
702 } else
703 client->imexseq = 0;
704
705 if (c == mousedev_imps_seq[client->impsseq]) {
706 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
707 client->impsseq = 0;
708 client->mode = MOUSEDEV_EMUL_IMPS;
709 }
710 } else
711 client->impsseq = 0;
712
713 mousedev_generate_response(client, c);
714
715 spin_unlock_irq(&client->packet_lock);
716 }
717
718 kill_fasync(&client->fasync, SIGIO, POLL_IN);
719 wake_up_interruptible(&client->mousedev->wait);
720
721 return count;
722 }
723
724 static ssize_t mousedev_read(struct file *file, char __user *buffer,
725 size_t count, loff_t *ppos)
726 {
727 struct mousedev_client *client = file->private_data;
728 struct mousedev *mousedev = client->mousedev;
729 signed char data[sizeof(client->ps2)];
730 int retval = 0;
731
732 if (!client->ready && !client->buffer && mousedev->exist &&
733 (file->f_flags & O_NONBLOCK))
734 return -EAGAIN;
735
736 retval = wait_event_interruptible(mousedev->wait,
737 !mousedev->exist || client->ready || client->buffer);
738 if (retval)
739 return retval;
740
741 if (!mousedev->exist)
742 return -ENODEV;
743
744 spin_lock_irq(&client->packet_lock);
745
746 if (!client->buffer && client->ready) {
747 mousedev_packet(client, client->ps2);
748 client->buffer = client->bufsiz;
749 }
750
751 if (count > client->buffer)
752 count = client->buffer;
753
754 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
755 client->buffer -= count;
756
757 spin_unlock_irq(&client->packet_lock);
758
759 if (copy_to_user(buffer, data, count))
760 return -EFAULT;
761
762 return count;
763 }
764
765 /* No kernel lock - fine */
766 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
767 {
768 struct mousedev_client *client = file->private_data;
769 struct mousedev *mousedev = client->mousedev;
770
771 poll_wait(file, &mousedev->wait, wait);
772 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
773 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
774 }
775
776 static const struct file_operations mousedev_fops = {
777 .owner = THIS_MODULE,
778 .read = mousedev_read,
779 .write = mousedev_write,
780 .poll = mousedev_poll,
781 .open = mousedev_open,
782 .release = mousedev_release,
783 .fasync = mousedev_fasync,
784 };
785
786 static int mousedev_install_chrdev(struct mousedev *mousedev)
787 {
788 mousedev_table[mousedev->minor] = mousedev;
789 return 0;
790 }
791
792 static void mousedev_remove_chrdev(struct mousedev *mousedev)
793 {
794 mutex_lock(&mousedev_table_mutex);
795 mousedev_table[mousedev->minor] = NULL;
796 mutex_unlock(&mousedev_table_mutex);
797 }
798
799 /*
800 * Mark device non-existent. This disables writes, ioctls and
801 * prevents new users from opening the device. Already posted
802 * blocking reads will stay, however new ones will fail.
803 */
804 static void mousedev_mark_dead(struct mousedev *mousedev)
805 {
806 mutex_lock(&mousedev->mutex);
807 mousedev->exist = 0;
808 mutex_unlock(&mousedev->mutex);
809 }
810
811 /*
812 * Wake up users waiting for IO so they can disconnect from
813 * dead device.
814 */
815 static void mousedev_hangup(struct mousedev *mousedev)
816 {
817 struct mousedev_client *client;
818
819 spin_lock(&mousedev->client_lock);
820 list_for_each_entry(client, &mousedev->client_list, node)
821 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
822 spin_unlock(&mousedev->client_lock);
823
824 wake_up_interruptible(&mousedev->wait);
825 }
826
827 static void mousedev_cleanup(struct mousedev *mousedev)
828 {
829 struct input_handle *handle = &mousedev->handle;
830
831 mousedev_mark_dead(mousedev);
832 mousedev_hangup(mousedev);
833 mousedev_remove_chrdev(mousedev);
834
835 /* mousedev is marked dead so no one else accesses mousedev->open */
836 if (mousedev->open)
837 input_close_device(handle);
838 }
839
840 static struct mousedev *mousedev_create(struct input_dev *dev,
841 struct input_handler *handler,
842 int minor)
843 {
844 struct mousedev *mousedev;
845 int error;
846
847 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
848 if (!mousedev) {
849 error = -ENOMEM;
850 goto err_out;
851 }
852
853 INIT_LIST_HEAD(&mousedev->client_list);
854 INIT_LIST_HEAD(&mousedev->mixdev_node);
855 spin_lock_init(&mousedev->client_lock);
856 mutex_init(&mousedev->mutex);
857 lockdep_set_subclass(&mousedev->mutex,
858 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
859 init_waitqueue_head(&mousedev->wait);
860
861 if (minor == MOUSEDEV_MIX)
862 strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
863 else
864 snprintf(mousedev->name, sizeof(mousedev->name),
865 "mouse%d", minor);
866
867 mousedev->minor = minor;
868 mousedev->exist = 1;
869 mousedev->handle.dev = dev;
870 mousedev->handle.name = mousedev->name;
871 mousedev->handle.handler = handler;
872 mousedev->handle.private = mousedev;
873
874 strlcpy(mousedev->dev.bus_id, mousedev->name,
875 sizeof(mousedev->dev.bus_id));
876 mousedev->dev.class = &input_class;
877 if (dev)
878 mousedev->dev.parent = &dev->dev;
879 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
880 mousedev->dev.release = mousedev_free;
881 device_initialize(&mousedev->dev);
882
883 if (minor != MOUSEDEV_MIX) {
884 error = input_register_handle(&mousedev->handle);
885 if (error)
886 goto err_free_mousedev;
887 }
888
889 error = mousedev_install_chrdev(mousedev);
890 if (error)
891 goto err_unregister_handle;
892
893 error = device_add(&mousedev->dev);
894 if (error)
895 goto err_cleanup_mousedev;
896
897 return mousedev;
898
899 err_cleanup_mousedev:
900 mousedev_cleanup(mousedev);
901 err_unregister_handle:
902 if (minor != MOUSEDEV_MIX)
903 input_unregister_handle(&mousedev->handle);
904 err_free_mousedev:
905 put_device(&mousedev->dev);
906 err_out:
907 return ERR_PTR(error);
908 }
909
910 static void mousedev_destroy(struct mousedev *mousedev)
911 {
912 device_del(&mousedev->dev);
913 mousedev_cleanup(mousedev);
914 if (mousedev->minor != MOUSEDEV_MIX)
915 input_unregister_handle(&mousedev->handle);
916 put_device(&mousedev->dev);
917 }
918
919 static int mixdev_add_device(struct mousedev *mousedev)
920 {
921 int retval;
922
923 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
924 if (retval)
925 return retval;
926
927 if (mousedev_mix->open) {
928 retval = mousedev_open_device(mousedev);
929 if (retval)
930 goto out;
931
932 mousedev->mixdev_open = 1;
933 }
934
935 get_device(&mousedev->dev);
936 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
937
938 out:
939 mutex_unlock(&mousedev_mix->mutex);
940 return retval;
941 }
942
943 static void mixdev_remove_device(struct mousedev *mousedev)
944 {
945 mutex_lock(&mousedev_mix->mutex);
946
947 if (mousedev->mixdev_open) {
948 mousedev->mixdev_open = 0;
949 mousedev_close_device(mousedev);
950 }
951
952 list_del_init(&mousedev->mixdev_node);
953 mutex_unlock(&mousedev_mix->mutex);
954
955 put_device(&mousedev->dev);
956 }
957
958 static int mousedev_connect(struct input_handler *handler,
959 struct input_dev *dev,
960 const struct input_device_id *id)
961 {
962 struct mousedev *mousedev;
963 int minor;
964 int error;
965
966 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
967 if (!mousedev_table[minor])
968 break;
969
970 if (minor == MOUSEDEV_MINORS) {
971 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
972 return -ENFILE;
973 }
974
975 mousedev = mousedev_create(dev, handler, minor);
976 if (IS_ERR(mousedev))
977 return PTR_ERR(mousedev);
978
979 error = mixdev_add_device(mousedev);
980 if (error) {
981 mousedev_destroy(mousedev);
982 return error;
983 }
984
985 return 0;
986 }
987
988 static void mousedev_disconnect(struct input_handle *handle)
989 {
990 struct mousedev *mousedev = handle->private;
991
992 mixdev_remove_device(mousedev);
993 mousedev_destroy(mousedev);
994 }
995
996 static const struct input_device_id mousedev_ids[] = {
997 {
998 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
999 INPUT_DEVICE_ID_MATCH_KEYBIT |
1000 INPUT_DEVICE_ID_MATCH_RELBIT,
1001 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
1002 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
1003 .relbit = { BIT(REL_X) | BIT(REL_Y) },
1004 }, /* A mouse like device, at least one button,
1005 two relative axes */
1006 {
1007 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1008 INPUT_DEVICE_ID_MATCH_RELBIT,
1009 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
1010 .relbit = { BIT(REL_WHEEL) },
1011 }, /* A separate scrollwheel */
1012 {
1013 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1014 INPUT_DEVICE_ID_MATCH_KEYBIT |
1015 INPUT_DEVICE_ID_MATCH_ABSBIT,
1016 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
1017 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
1018 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
1019 }, /* A tablet like device, at least touch detection,
1020 two absolute axes */
1021 {
1022 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1023 INPUT_DEVICE_ID_MATCH_KEYBIT |
1024 INPUT_DEVICE_ID_MATCH_ABSBIT,
1025 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
1026 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
1027 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) |
1028 BIT(ABS_TOOL_WIDTH) },
1029 }, /* A touchpad */
1030
1031 { }, /* Terminating entry */
1032 };
1033
1034 MODULE_DEVICE_TABLE(input, mousedev_ids);
1035
1036 static struct input_handler mousedev_handler = {
1037 .event = mousedev_event,
1038 .connect = mousedev_connect,
1039 .disconnect = mousedev_disconnect,
1040 .fops = &mousedev_fops,
1041 .minor = MOUSEDEV_MINOR_BASE,
1042 .name = "mousedev",
1043 .id_table = mousedev_ids,
1044 };
1045
1046 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1047 static struct miscdevice psaux_mouse = {
1048 PSMOUSE_MINOR, "psaux", &mousedev_fops
1049 };
1050 static int psaux_registered;
1051 #endif
1052
1053 static int __init mousedev_init(void)
1054 {
1055 int error;
1056
1057 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1058 if (IS_ERR(mousedev_mix))
1059 return PTR_ERR(mousedev_mix);
1060
1061 error = input_register_handler(&mousedev_handler);
1062 if (error) {
1063 mousedev_destroy(mousedev_mix);
1064 return error;
1065 }
1066
1067 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1068 error = misc_register(&psaux_mouse);
1069 if (error)
1070 printk(KERN_WARNING "mice: could not register psaux device, "
1071 "error: %d\n", error);
1072 else
1073 psaux_registered = 1;
1074 #endif
1075
1076 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1077
1078 return 0;
1079 }
1080
1081 static void __exit mousedev_exit(void)
1082 {
1083 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1084 if (psaux_registered)
1085 misc_deregister(&psaux_mouse);
1086 #endif
1087 input_unregister_handler(&mousedev_handler);
1088 mousedev_destroy(mousedev_mix);
1089 }
1090
1091 module_init(mousedev_init);
1092 module_exit(mousedev_exit);
Mirror for ia64_pv_ops.git