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First Support on Ginger and OMAP TI
[linux-ginger.git] / drivers / input / mousedev.c
bloba13d80f7da17481772cc4e00f260b2f564919e13
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/smp_lock.h>
19 #include <linux/poll.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/input.h>
23 #include <linux/random.h>
24 #include <linux/major.h>
25 #include <linux/device.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 exist;
62 int open;
63 int minor;
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 struct mousedev_client *client = file->private_data;
407
408 return fasync_helper(fd, file, on, &client->fasync);
409 }
410
411 static void mousedev_free(struct device *dev)
412 {
413 struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
414
415 input_put_device(mousedev->handle.dev);
416 kfree(mousedev);
417 }
418
419 static int mousedev_open_device(struct mousedev *mousedev)
420 {
421 int retval;
422
423 retval = mutex_lock_interruptible(&mousedev->mutex);
424 if (retval)
425 return retval;
426
427 if (mousedev->minor == MOUSEDEV_MIX)
428 mixdev_open_devices();
429 else if (!mousedev->exist)
430 retval = -ENODEV;
431 else if (!mousedev->open++) {
432 retval = input_open_device(&mousedev->handle);
433 if (retval)
434 mousedev->open--;
435 }
436
437 mutex_unlock(&mousedev->mutex);
438 return retval;
439 }
440
441 static void mousedev_close_device(struct mousedev *mousedev)
442 {
443 mutex_lock(&mousedev->mutex);
444
445 if (mousedev->minor == MOUSEDEV_MIX)
446 mixdev_close_devices();
447 else if (mousedev->exist && !--mousedev->open)
448 input_close_device(&mousedev->handle);
449
450 mutex_unlock(&mousedev->mutex);
451 }
452
453 /*
454 * Open all available devices so they can all be multiplexed in one.
455 * stream. Note that this function is called with mousedev_mix->mutex
456 * held.
457 */
458 static void mixdev_open_devices(void)
459 {
460 struct mousedev *mousedev;
461
462 if (mousedev_mix->open++)
463 return;
464
465 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
466 if (!mousedev->mixdev_open) {
467 if (mousedev_open_device(mousedev))
468 continue;
469
470 mousedev->mixdev_open = 1;
471 }
472 }
473 }
474
475 /*
476 * Close all devices that were opened as part of multiplexed
477 * device. Note that this function is called with mousedev_mix->mutex
478 * held.
479 */
480 static void mixdev_close_devices(void)
481 {
482 struct mousedev *mousedev;
483
484 if (--mousedev_mix->open)
485 return;
486
487 list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
488 if (mousedev->mixdev_open) {
489 mousedev->mixdev_open = 0;
490 mousedev_close_device(mousedev);
491 }
492 }
493 }
494
495
496 static void mousedev_attach_client(struct mousedev *mousedev,
497 struct mousedev_client *client)
498 {
499 spin_lock(&mousedev->client_lock);
500 list_add_tail_rcu(&client->node, &mousedev->client_list);
501 spin_unlock(&mousedev->client_lock);
502 synchronize_rcu();
503 }
504
505 static void mousedev_detach_client(struct mousedev *mousedev,
506 struct mousedev_client *client)
507 {
508 spin_lock(&mousedev->client_lock);
509 list_del_rcu(&client->node);
510 spin_unlock(&mousedev->client_lock);
511 synchronize_rcu();
512 }
513
514 static int mousedev_release(struct inode *inode, struct file *file)
515 {
516 struct mousedev_client *client = file->private_data;
517 struct mousedev *mousedev = client->mousedev;
518
519 mousedev_detach_client(mousedev, client);
520 kfree(client);
521
522 mousedev_close_device(mousedev);
523 put_device(&mousedev->dev);
524
525 return 0;
526 }
527
528 static int mousedev_open(struct inode *inode, struct file *file)
529 {
530 struct mousedev_client *client;
531 struct mousedev *mousedev;
532 int error;
533 int i;
534
535 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
536 if (imajor(inode) == MISC_MAJOR)
537 i = MOUSEDEV_MIX;
538 else
539 #endif
540 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
541
542 if (i >= MOUSEDEV_MINORS)
543 return -ENODEV;
544
545 lock_kernel();
546 error = mutex_lock_interruptible(&mousedev_table_mutex);
547 if (error) {
548 unlock_kernel();
549 return error;
550 }
551 mousedev = mousedev_table[i];
552 if (mousedev)
553 get_device(&mousedev->dev);
554 mutex_unlock(&mousedev_table_mutex);
555
556 if (!mousedev) {
557 unlock_kernel();
558 return -ENODEV;
559 }
560
561 client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
562 if (!client) {
563 error = -ENOMEM;
564 goto err_put_mousedev;
565 }
566
567 spin_lock_init(&client->packet_lock);
568 client->pos_x = xres / 2;
569 client->pos_y = yres / 2;
570 client->mousedev = mousedev;
571 mousedev_attach_client(mousedev, client);
572
573 error = mousedev_open_device(mousedev);
574 if (error)
575 goto err_free_client;
576
577 file->private_data = client;
578 unlock_kernel();
579 return 0;
580
581 err_free_client:
582 mousedev_detach_client(mousedev, client);
583 kfree(client);
584 err_put_mousedev:
585 put_device(&mousedev->dev);
586 unlock_kernel();
587 return error;
588 }
589
590 static inline int mousedev_limit_delta(int delta, int limit)
591 {
592 return delta > limit ? limit : (delta < -limit ? -limit : delta);
593 }
594
595 static void mousedev_packet(struct mousedev_client *client,
596 signed char *ps2_data)
597 {
598 struct mousedev_motion *p = &client->packets[client->tail];
599
600 ps2_data[0] = 0x08 |
601 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
602 ps2_data[1] = mousedev_limit_delta(p->dx, 127);
603 ps2_data[2] = mousedev_limit_delta(p->dy, 127);
604 p->dx -= ps2_data[1];
605 p->dy -= ps2_data[2];
606
607 switch (client->mode) {
608 case MOUSEDEV_EMUL_EXPS:
609 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
610 p->dz -= ps2_data[3];
611 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
612 client->bufsiz = 4;
613 break;
614
615 case MOUSEDEV_EMUL_IMPS:
616 ps2_data[0] |=
617 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
618 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
619 p->dz -= ps2_data[3];
620 client->bufsiz = 4;
621 break;
622
623 case MOUSEDEV_EMUL_PS2:
624 default:
625 ps2_data[0] |=
626 ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
627 p->dz = 0;
628 client->bufsiz = 3;
629 break;
630 }
631
632 if (!p->dx && !p->dy && !p->dz) {
633 if (client->tail == client->head) {
634 client->ready = 0;
635 client->last_buttons = p->buttons;
636 } else
637 client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
638 }
639 }
640
641 static void mousedev_generate_response(struct mousedev_client *client,
642 int command)
643 {
644 client->ps2[0] = 0xfa; /* ACK */
645
646 switch (command) {
647
648 case 0xeb: /* Poll */
649 mousedev_packet(client, &client->ps2[1]);
650 client->bufsiz++; /* account for leading ACK */
651 break;
652
653 case 0xf2: /* Get ID */
654 switch (client->mode) {
655 case MOUSEDEV_EMUL_PS2:
656 client->ps2[1] = 0;
657 break;
658 case MOUSEDEV_EMUL_IMPS:
659 client->ps2[1] = 3;
660 break;
661 case MOUSEDEV_EMUL_EXPS:
662 client->ps2[1] = 4;
663 break;
664 }
665 client->bufsiz = 2;
666 break;
667
668 case 0xe9: /* Get info */
669 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
670 client->bufsiz = 4;
671 break;
672
673 case 0xff: /* Reset */
674 client->impsseq = client->imexseq = 0;
675 client->mode = MOUSEDEV_EMUL_PS2;
676 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
677 client->bufsiz = 3;
678 break;
679
680 default:
681 client->bufsiz = 1;
682 break;
683 }
684 client->buffer = client->bufsiz;
685 }
686
687 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
688 size_t count, loff_t *ppos)
689 {
690 struct mousedev_client *client = file->private_data;
691 unsigned char c;
692 unsigned int i;
693
694 for (i = 0; i < count; i++) {
695
696 if (get_user(c, buffer + i))
697 return -EFAULT;
698
699 spin_lock_irq(&client->packet_lock);
700
701 if (c == mousedev_imex_seq[client->imexseq]) {
702 if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
703 client->imexseq = 0;
704 client->mode = MOUSEDEV_EMUL_EXPS;
705 }
706 } else
707 client->imexseq = 0;
708
709 if (c == mousedev_imps_seq[client->impsseq]) {
710 if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
711 client->impsseq = 0;
712 client->mode = MOUSEDEV_EMUL_IMPS;
713 }
714 } else
715 client->impsseq = 0;
716
717 mousedev_generate_response(client, c);
718
719 spin_unlock_irq(&client->packet_lock);
720 }
721
722 kill_fasync(&client->fasync, SIGIO, POLL_IN);
723 wake_up_interruptible(&client->mousedev->wait);
724
725 return count;
726 }
727
728 static ssize_t mousedev_read(struct file *file, char __user *buffer,
729 size_t count, loff_t *ppos)
730 {
731 struct mousedev_client *client = file->private_data;
732 struct mousedev *mousedev = client->mousedev;
733 signed char data[sizeof(client->ps2)];
734 int retval = 0;
735
736 if (!client->ready && !client->buffer && mousedev->exist &&
737 (file->f_flags & O_NONBLOCK))
738 return -EAGAIN;
739
740 retval = wait_event_interruptible(mousedev->wait,
741 !mousedev->exist || client->ready || client->buffer);
742 if (retval)
743 return retval;
744
745 if (!mousedev->exist)
746 return -ENODEV;
747
748 spin_lock_irq(&client->packet_lock);
749
750 if (!client->buffer && client->ready) {
751 mousedev_packet(client, client->ps2);
752 client->buffer = client->bufsiz;
753 }
754
755 if (count > client->buffer)
756 count = client->buffer;
757
758 memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
759 client->buffer -= count;
760
761 spin_unlock_irq(&client->packet_lock);
762
763 if (copy_to_user(buffer, data, count))
764 return -EFAULT;
765
766 return count;
767 }
768
769 /* No kernel lock - fine */
770 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
771 {
772 struct mousedev_client *client = file->private_data;
773 struct mousedev *mousedev = client->mousedev;
774
775 poll_wait(file, &mousedev->wait, wait);
776 return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
777 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
778 }
779
780 static const struct file_operations mousedev_fops = {
781 .owner = THIS_MODULE,
782 .read = mousedev_read,
783 .write = mousedev_write,
784 .poll = mousedev_poll,
785 .open = mousedev_open,
786 .release = mousedev_release,
787 .fasync = mousedev_fasync,
788 };
789
790 static int mousedev_install_chrdev(struct mousedev *mousedev)
791 {
792 mousedev_table[mousedev->minor] = mousedev;
793 return 0;
794 }
795
796 static void mousedev_remove_chrdev(struct mousedev *mousedev)
797 {
798 mutex_lock(&mousedev_table_mutex);
799 mousedev_table[mousedev->minor] = NULL;
800 mutex_unlock(&mousedev_table_mutex);
801 }
802
803 /*
804 * Mark device non-existent. This disables writes, ioctls and
805 * prevents new users from opening the device. Already posted
806 * blocking reads will stay, however new ones will fail.
807 */
808 static void mousedev_mark_dead(struct mousedev *mousedev)
809 {
810 mutex_lock(&mousedev->mutex);
811 mousedev->exist = 0;
812 mutex_unlock(&mousedev->mutex);
813 }
814
815 /*
816 * Wake up users waiting for IO so they can disconnect from
817 * dead device.
818 */
819 static void mousedev_hangup(struct mousedev *mousedev)
820 {
821 struct mousedev_client *client;
822
823 spin_lock(&mousedev->client_lock);
824 list_for_each_entry(client, &mousedev->client_list, node)
825 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
826 spin_unlock(&mousedev->client_lock);
827
828 wake_up_interruptible(&mousedev->wait);
829 }
830
831 static void mousedev_cleanup(struct mousedev *mousedev)
832 {
833 struct input_handle *handle = &mousedev->handle;
834
835 mousedev_mark_dead(mousedev);
836 mousedev_hangup(mousedev);
837 mousedev_remove_chrdev(mousedev);
838
839 /* mousedev is marked dead so no one else accesses mousedev->open */
840 if (mousedev->open)
841 input_close_device(handle);
842 }
843
844 static struct mousedev *mousedev_create(struct input_dev *dev,
845 struct input_handler *handler,
846 int minor)
847 {
848 struct mousedev *mousedev;
849 int error;
850
851 mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
852 if (!mousedev) {
853 error = -ENOMEM;
854 goto err_out;
855 }
856
857 INIT_LIST_HEAD(&mousedev->client_list);
858 INIT_LIST_HEAD(&mousedev->mixdev_node);
859 spin_lock_init(&mousedev->client_lock);
860 mutex_init(&mousedev->mutex);
861 lockdep_set_subclass(&mousedev->mutex,
862 minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
863 init_waitqueue_head(&mousedev->wait);
864
865 if (minor == MOUSEDEV_MIX)
866 dev_set_name(&mousedev->dev, "mice");
867 else
868 dev_set_name(&mousedev->dev, "mouse%d", minor);
869
870 mousedev->minor = minor;
871 mousedev->exist = 1;
872 mousedev->handle.dev = input_get_device(dev);
873 mousedev->handle.name = dev_name(&mousedev->dev);
874 mousedev->handle.handler = handler;
875 mousedev->handle.private = mousedev;
876
877 mousedev->dev.class = &input_class;
878 if (dev)
879 mousedev->dev.parent = &dev->dev;
880 mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
881 mousedev->dev.release = mousedev_free;
882 device_initialize(&mousedev->dev);
883
884 if (minor != MOUSEDEV_MIX) {
885 error = input_register_handle(&mousedev->handle);
886 if (error)
887 goto err_free_mousedev;
888 }
889
890 error = mousedev_install_chrdev(mousedev);
891 if (error)
892 goto err_unregister_handle;
893
894 error = device_add(&mousedev->dev);
895 if (error)
896 goto err_cleanup_mousedev;
897
898 return mousedev;
899
900 err_cleanup_mousedev:
901 mousedev_cleanup(mousedev);
902 err_unregister_handle:
903 if (minor != MOUSEDEV_MIX)
904 input_unregister_handle(&mousedev->handle);
905 err_free_mousedev:
906 put_device(&mousedev->dev);
907 err_out:
908 return ERR_PTR(error);
909 }
910
911 static void mousedev_destroy(struct mousedev *mousedev)
912 {
913 device_del(&mousedev->dev);
914 mousedev_cleanup(mousedev);
915 if (mousedev->minor != MOUSEDEV_MIX)
916 input_unregister_handle(&mousedev->handle);
917 put_device(&mousedev->dev);
918 }
919
920 static int mixdev_add_device(struct mousedev *mousedev)
921 {
922 int retval;
923
924 retval = mutex_lock_interruptible(&mousedev_mix->mutex);
925 if (retval)
926 return retval;
927
928 if (mousedev_mix->open) {
929 retval = mousedev_open_device(mousedev);
930 if (retval)
931 goto out;
932
933 mousedev->mixdev_open = 1;
934 }
935
936 get_device(&mousedev->dev);
937 list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
938
939 out:
940 mutex_unlock(&mousedev_mix->mutex);
941 return retval;
942 }
943
944 static void mixdev_remove_device(struct mousedev *mousedev)
945 {
946 mutex_lock(&mousedev_mix->mutex);
947
948 if (mousedev->mixdev_open) {
949 mousedev->mixdev_open = 0;
950 mousedev_close_device(mousedev);
951 }
952
953 list_del_init(&mousedev->mixdev_node);
954 mutex_unlock(&mousedev_mix->mutex);
955
956 put_device(&mousedev->dev);
957 }
958
959 static int mousedev_connect(struct input_handler *handler,
960 struct input_dev *dev,
961 const struct input_device_id *id)
962 {
963 struct mousedev *mousedev;
964 int minor;
965 int error;
966
967 for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
968 if (!mousedev_table[minor])
969 break;
970
971 if (minor == MOUSEDEV_MINORS) {
972 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
973 return -ENFILE;
974 }
975
976 mousedev = mousedev_create(dev, handler, minor);
977 if (IS_ERR(mousedev))
978 return PTR_ERR(mousedev);
979
980 error = mixdev_add_device(mousedev);
981 if (error) {
982 mousedev_destroy(mousedev);
983 return error;
984 }
985
986 return 0;
987 }
988
989 static void mousedev_disconnect(struct input_handle *handle)
990 {
991 struct mousedev *mousedev = handle->private;
992
993 mixdev_remove_device(mousedev);
994 mousedev_destroy(mousedev);
995 }
996
997 static const struct input_device_id mousedev_ids[] = {
998 {
999 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1000 INPUT_DEVICE_ID_MATCH_KEYBIT |
1001 INPUT_DEVICE_ID_MATCH_RELBIT,
1002 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1003 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1004 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
1005 }, /* A mouse like device, at least one button,
1006 two relative axes */
1007 {
1008 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1009 INPUT_DEVICE_ID_MATCH_RELBIT,
1010 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1011 .relbit = { BIT_MASK(REL_WHEEL) },
1012 }, /* A separate scrollwheel */
1013 {
1014 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1015 INPUT_DEVICE_ID_MATCH_KEYBIT |
1016 INPUT_DEVICE_ID_MATCH_ABSBIT,
1017 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1018 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1019 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1020 }, /* A tablet like device, at least touch detection,
1021 two absolute axes */
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_TOOL_FINGER)] =
1028 BIT_MASK(BTN_TOOL_FINGER) },
1029 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1030 BIT_MASK(ABS_PRESSURE) |
1031 BIT_MASK(ABS_TOOL_WIDTH) },
1032 }, /* A touchpad */
1033 {
1034 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1035 INPUT_DEVICE_ID_MATCH_KEYBIT |
1036 INPUT_DEVICE_ID_MATCH_ABSBIT,
1037 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1038 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1039 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1040 }, /* Mouse-like device with absolute X and Y but ordinary
1041 clicks, like hp ILO2 High Performance mouse */
1042
1043 { }, /* Terminating entry */
1044 };
1045
1046 MODULE_DEVICE_TABLE(input, mousedev_ids);
1047
1048 static struct input_handler mousedev_handler = {
1049 .event = mousedev_event,
1050 .connect = mousedev_connect,
1051 .disconnect = mousedev_disconnect,
1052 .fops = &mousedev_fops,
1053 .minor = MOUSEDEV_MINOR_BASE,
1054 .name = "mousedev",
1055 .id_table = mousedev_ids,
1056 };
1057
1058 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1059 static struct miscdevice psaux_mouse = {
1060 PSMOUSE_MINOR, "psaux", &mousedev_fops
1061 };
1062 static int psaux_registered;
1063 #endif
1064
1065 static int __init mousedev_init(void)
1066 {
1067 int error;
1068
1069 mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1070 if (IS_ERR(mousedev_mix))
1071 return PTR_ERR(mousedev_mix);
1072
1073 error = input_register_handler(&mousedev_handler);
1074 if (error) {
1075 mousedev_destroy(mousedev_mix);
1076 return error;
1077 }
1078
1079 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1080 error = misc_register(&psaux_mouse);
1081 if (error)
1082 printk(KERN_WARNING "mice: could not register psaux device, "
1083 "error: %d\n", error);
1084 else
1085 psaux_registered = 1;
1086 #endif
1087
1088 printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
1089
1090 return 0;
1091 }
1092
1093 static void __exit mousedev_exit(void)
1094 {
1095 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1096 if (psaux_registered)
1097 misc_deregister(&psaux_mouse);
1098 #endif
1099 input_unregister_handler(&mousedev_handler);
1100 mousedev_destroy(mousedev_mix);
1101 }
1102
1103 module_init(mousedev_init);
1104 module_exit(mousedev_exit);
Linux for Ginger Game Console