Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / input / mousedev.c
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         wait_queue_head_t wait;
65         struct list_head client_list;
66         struct input_handle handle;
67
68         struct list_head mixdev_node;
69         int mixdev_open;
70
71         struct mousedev_hw_data packet;
72         unsigned int pkt_count;
73         int old_x[4], old_y[4];
74         int frac_dx, frac_dy;
75         unsigned long touch;
76 };
77
78 enum mousedev_emul {
79         MOUSEDEV_EMUL_PS2,
80         MOUSEDEV_EMUL_IMPS,
81         MOUSEDEV_EMUL_EXPS
82 };
83
84 struct mousedev_motion {
85         int dx, dy, dz;
86         unsigned long buttons;
87 };
88
89 #define PACKET_QUEUE_LEN        16
90 struct mousedev_client {
91         struct fasync_struct *fasync;
92         struct mousedev *mousedev;
93         struct list_head node;
94
95         struct mousedev_motion packets[PACKET_QUEUE_LEN];
96         unsigned int head, tail;
97         spinlock_t packet_lock;
98         int pos_x, pos_y;
99
100         signed char ps2[6];
101         unsigned char ready, buffer, bufsiz;
102         unsigned char imexseq, impsseq;
103         enum mousedev_emul mode;
104         unsigned long last_buttons;
105 };
106
107 #define MOUSEDEV_SEQ_LEN        6
108
109 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
110 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
111
112 static struct input_handler mousedev_handler;
113
114 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
115 static struct mousedev mousedev_mix;
116 static LIST_HEAD(mousedev_mix_list);
117
118 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
119 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
120
121 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
122 {
123         int size, tmp;
124         enum { FRACTION_DENOM = 128 };
125
126         switch (code) {
127                 case ABS_X:
128                         fx(0) = value;
129                         if (mousedev->touch && mousedev->pkt_count >= 2) {
130                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
131                                 if (size == 0)
132                                         size = 256 * 2;
133                                 tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
134                                 tmp += mousedev->frac_dx;
135                                 mousedev->packet.dx = tmp / FRACTION_DENOM;
136                                 mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
137                         }
138                         break;
139
140                 case ABS_Y:
141                         fy(0) = value;
142                         if (mousedev->touch && mousedev->pkt_count >= 2) {
143                                 /* use X size to keep the same scale */
144                                 size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
145                                 if (size == 0)
146                                         size = 256 * 2;
147                                 tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
148                                 tmp += mousedev->frac_dy;
149                                 mousedev->packet.dy = tmp / FRACTION_DENOM;
150                                 mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
151                         }
152                         break;
153         }
154 }
155
156 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
157 {
158         int size;
159
160         switch (code) {
161                 case ABS_X:
162                         size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
163                         if (size == 0)
164                                 size = xres ? : 1;
165                         if (value > dev->absmax[ABS_X])
166                                 value = dev->absmax[ABS_X];
167                         if (value < dev->absmin[ABS_X])
168                                 value = dev->absmin[ABS_X];
169                         mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
170                         mousedev->packet.abs_event = 1;
171                         break;
172
173                 case ABS_Y:
174                         size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
175                         if (size == 0)
176                                 size = yres ? : 1;
177                         if (value > dev->absmax[ABS_Y])
178                                 value = dev->absmax[ABS_Y];
179                         if (value < dev->absmin[ABS_Y])
180                                 value = dev->absmin[ABS_Y];
181                         mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
182                         mousedev->packet.abs_event = 1;
183                         break;
184         }
185 }
186
187 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
188 {
189         switch (code) {
190                 case REL_X:     mousedev->packet.dx += value; break;
191                 case REL_Y:     mousedev->packet.dy -= value; break;
192                 case REL_WHEEL: mousedev->packet.dz -= value; break;
193         }
194 }
195
196 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
197 {
198         int index;
199
200         switch (code) {
201                 case BTN_TOUCH:
202                 case BTN_0:
203                 case BTN_LEFT:          index = 0; break;
204                 case BTN_STYLUS:
205                 case BTN_1:
206                 case BTN_RIGHT:         index = 1; break;
207                 case BTN_2:
208                 case BTN_FORWARD:
209                 case BTN_STYLUS2:
210                 case BTN_MIDDLE:        index = 2; break;
211                 case BTN_3:
212                 case BTN_BACK:
213                 case BTN_SIDE:          index = 3; break;
214                 case BTN_4:
215                 case BTN_EXTRA:         index = 4; break;
216                 default:                return;
217         }
218
219         if (value) {
220                 set_bit(index, &mousedev->packet.buttons);
221                 set_bit(index, &mousedev_mix.packet.buttons);
222         } else {
223                 clear_bit(index, &mousedev->packet.buttons);
224                 clear_bit(index, &mousedev_mix.packet.buttons);
225         }
226 }
227
228 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
229 {
230         struct mousedev_client *client;
231         struct mousedev_motion *p;
232         unsigned long flags;
233         int wake_readers = 0;
234
235         list_for_each_entry(client, &mousedev->client_list, node) {
236                 spin_lock_irqsave(&client->packet_lock, flags);
237
238                 p = &client->packets[client->head];
239                 if (client->ready && p->buttons != mousedev->packet.buttons) {
240                         unsigned int new_head = (client->head + 1) % PACKET_QUEUE_LEN;
241                         if (new_head != client->tail) {
242                                 p = &client->packets[client->head = new_head];
243                                 memset(p, 0, sizeof(struct mousedev_motion));
244                         }
245                 }
246
247                 if (packet->abs_event) {
248                         p->dx += packet->x - client->pos_x;
249                         p->dy += packet->y - client->pos_y;
250                         client->pos_x = packet->x;
251                         client->pos_y = packet->y;
252                 }
253
254                 client->pos_x += packet->dx;
255                 client->pos_x = client->pos_x < 0 ? 0 : (client->pos_x >= xres ? xres : client->pos_x);
256                 client->pos_y += packet->dy;
257                 client->pos_y = client->pos_y < 0 ? 0 : (client->pos_y >= yres ? yres : client->pos_y);
258
259                 p->dx += packet->dx;
260                 p->dy += packet->dy;
261                 p->dz += packet->dz;
262                 p->buttons = mousedev->packet.buttons;
263
264                 if (p->dx || p->dy || p->dz || p->buttons != client->last_buttons)
265                         client->ready = 1;
266
267                 spin_unlock_irqrestore(&client->packet_lock, flags);
268
269                 if (client->ready) {
270                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
271                         wake_readers = 1;
272                 }
273         }
274
275         if (wake_readers)
276                 wake_up_interruptible(&mousedev->wait);
277 }
278
279 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
280 {
281         if (!value) {
282                 if (mousedev->touch &&
283                     time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
284                         /*
285                          * Toggle left button to emulate tap.
286                          * We rely on the fact that mousedev_mix always has 0
287                          * motion packet so we won't mess current position.
288                          */
289                         set_bit(0, &mousedev->packet.buttons);
290                         set_bit(0, &mousedev_mix.packet.buttons);
291                         mousedev_notify_readers(mousedev, &mousedev_mix.packet);
292                         mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
293                         clear_bit(0, &mousedev->packet.buttons);
294                         clear_bit(0, &mousedev_mix.packet.buttons);
295                 }
296                 mousedev->touch = mousedev->pkt_count = 0;
297                 mousedev->frac_dx = 0;
298                 mousedev->frac_dy = 0;
299
300         } else if (!mousedev->touch)
301                 mousedev->touch = jiffies;
302 }
303
304 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
305 {
306         struct mousedev *mousedev = handle->private;
307
308         switch (type) {
309                 case EV_ABS:
310                         /* Ignore joysticks */
311                         if (test_bit(BTN_TRIGGER, handle->dev->keybit))
312                                 return;
313
314                         if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
315                                 mousedev_touchpad_event(handle->dev, mousedev, code, value);
316                         else
317                                 mousedev_abs_event(handle->dev, mousedev, code, value);
318
319                         break;
320
321                 case EV_REL:
322                         mousedev_rel_event(mousedev, code, value);
323                         break;
324
325                 case EV_KEY:
326                         if (value != 2) {
327                                 if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
328                                         mousedev_touchpad_touch(mousedev, value);
329                                 else
330                                         mousedev_key_event(mousedev, code, value);
331                         }
332                         break;
333
334                 case EV_SYN:
335                         if (code == SYN_REPORT) {
336                                 if (mousedev->touch) {
337                                         mousedev->pkt_count++;
338                                         /* Input system eats duplicate events, but we need all of them
339                                          * to do correct averaging so apply present one forward
340                                          */
341                                         fx(0) = fx(1);
342                                         fy(0) = fy(1);
343                                 }
344
345                                 mousedev_notify_readers(mousedev, &mousedev->packet);
346                                 mousedev_notify_readers(&mousedev_mix, &mousedev->packet);
347
348                                 mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
349                                 mousedev->packet.abs_event = 0;
350                         }
351                         break;
352         }
353 }
354
355 static int mousedev_fasync(int fd, struct file *file, int on)
356 {
357         int retval;
358         struct mousedev_client *client = file->private_data;
359
360         retval = fasync_helper(fd, file, on, &client->fasync);
361
362         return retval < 0 ? retval : 0;
363 }
364
365 static void mousedev_free(struct mousedev *mousedev)
366 {
367         mousedev_table[mousedev->minor] = NULL;
368         kfree(mousedev);
369 }
370
371 static int mixdev_add_device(struct mousedev *mousedev)
372 {
373         int error;
374
375         if (mousedev_mix.open) {
376                 error = input_open_device(&mousedev->handle);
377                 if (error)
378                         return error;
379
380                 mousedev->open++;
381                 mousedev->mixdev_open++;
382         }
383
384         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
385
386         return 0;
387 }
388
389 static void mixdev_remove_device(struct mousedev *mousedev)
390 {
391         if (mousedev->mixdev_open) {
392                 mousedev->mixdev_open = 0;
393                 if (!--mousedev->open && mousedev->exist)
394                         input_close_device(&mousedev->handle);
395         }
396
397         list_del_init(&mousedev->mixdev_node);
398 }
399
400 static void mixdev_open_devices(void)
401 {
402         struct mousedev *mousedev;
403
404         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
405                 if (mousedev->exist && !mousedev->open) {
406                         if (input_open_device(&mousedev->handle))
407                                 continue;
408
409                         mousedev->open++;
410                         mousedev->mixdev_open++;
411                 }
412         }
413 }
414
415 static void mixdev_close_devices(void)
416 {
417         struct mousedev *mousedev, *next;
418
419         list_for_each_entry_safe(mousedev, next, &mousedev_mix_list, mixdev_node) {
420                 if (mousedev->mixdev_open) {
421                         mousedev->mixdev_open = 0;
422                         if (!--mousedev->open) {
423                                 if (mousedev->exist)
424                                         input_close_device(&mousedev->handle);
425                                 else
426                                         mousedev_free(mousedev);
427                         }
428                 }
429         }
430 }
431
432 static int mousedev_release(struct inode *inode, struct file *file)
433 {
434         struct mousedev_client *client = file->private_data;
435         struct mousedev *mousedev = client->mousedev;
436
437         mousedev_fasync(-1, file, 0);
438
439         list_del(&client->node);
440         kfree(client);
441
442         if (!--mousedev->open) {
443                 if (mousedev->minor == MOUSEDEV_MIX)
444                         mixdev_close_devices();
445                 else if (mousedev->exist)
446                         input_close_device(&mousedev->handle);
447                 else
448                         mousedev_free(mousedev);
449         }
450
451         return 0;
452 }
453
454
455 static int mousedev_open(struct inode *inode, struct file *file)
456 {
457         struct mousedev_client *client;
458         struct mousedev *mousedev;
459         int error;
460         int i;
461
462 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
463         if (imajor(inode) == MISC_MAJOR)
464                 i = MOUSEDEV_MIX;
465         else
466 #endif
467                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
468
469         if (i >= MOUSEDEV_MINORS)
470                 return -ENODEV;
471
472         mousedev = mousedev_table[i];
473         if (!mousedev)
474                 return -ENODEV;
475
476         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
477         if (!client)
478                 return -ENOMEM;
479
480         spin_lock_init(&client->packet_lock);
481         client->pos_x = xres / 2;
482         client->pos_y = yres / 2;
483         client->mousedev = mousedev;
484         list_add_tail(&client->node, &mousedev->client_list);
485
486         if (!mousedev->open++) {
487                 if (mousedev->minor == MOUSEDEV_MIX)
488                         mixdev_open_devices();
489                 else if (mousedev->exist) {
490                         error = input_open_device(&mousedev->handle);
491                         if (error) {
492                                 list_del(&client->node);
493                                 kfree(client);
494                                 return error;
495                         }
496                 }
497         }
498
499         file->private_data = client;
500         return 0;
501 }
502
503 static inline int mousedev_limit_delta(int delta, int limit)
504 {
505         return delta > limit ? limit : (delta < -limit ? -limit : delta);
506 }
507
508 static void mousedev_packet(struct mousedev_client *client, signed char *ps2_data)
509 {
510         struct mousedev_motion *p;
511         unsigned long flags;
512
513         spin_lock_irqsave(&client->packet_lock, flags);
514         p = &client->packets[client->tail];
515
516         ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
517         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
518         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
519         p->dx -= ps2_data[1];
520         p->dy -= ps2_data[2];
521
522         switch (client->mode) {
523                 case MOUSEDEV_EMUL_EXPS:
524                         ps2_data[3] = mousedev_limit_delta(p->dz, 7);
525                         p->dz -= ps2_data[3];
526                         ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
527                         client->bufsiz = 4;
528                         break;
529
530                 case MOUSEDEV_EMUL_IMPS:
531                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
532                         ps2_data[3] = mousedev_limit_delta(p->dz, 127);
533                         p->dz -= ps2_data[3];
534                         client->bufsiz = 4;
535                         break;
536
537                 case MOUSEDEV_EMUL_PS2:
538                 default:
539                         ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
540                         p->dz = 0;
541                         client->bufsiz = 3;
542                         break;
543         }
544
545         if (!p->dx && !p->dy && !p->dz) {
546                 if (client->tail == client->head) {
547                         client->ready = 0;
548                         client->last_buttons = p->buttons;
549                 } else
550                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
551         }
552
553         spin_unlock_irqrestore(&client->packet_lock, flags);
554 }
555
556
557 static ssize_t mousedev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
558 {
559         struct mousedev_client *client = file->private_data;
560         unsigned char c;
561         unsigned int i;
562
563         for (i = 0; i < count; i++) {
564
565                 if (get_user(c, buffer + i))
566                         return -EFAULT;
567
568                 if (c == mousedev_imex_seq[client->imexseq]) {
569                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
570                                 client->imexseq = 0;
571                                 client->mode = MOUSEDEV_EMUL_EXPS;
572                         }
573                 } else
574                         client->imexseq = 0;
575
576                 if (c == mousedev_imps_seq[client->impsseq]) {
577                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
578                                 client->impsseq = 0;
579                                 client->mode = MOUSEDEV_EMUL_IMPS;
580                         }
581                 } else
582                         client->impsseq = 0;
583
584                 client->ps2[0] = 0xfa;
585
586                 switch (c) {
587
588                         case 0xeb: /* Poll */
589                                 mousedev_packet(client, &client->ps2[1]);
590                                 client->bufsiz++; /* account for leading ACK */
591                                 break;
592
593                         case 0xf2: /* Get ID */
594                                 switch (client->mode) {
595                                         case MOUSEDEV_EMUL_PS2:  client->ps2[1] = 0; break;
596                                         case MOUSEDEV_EMUL_IMPS: client->ps2[1] = 3; break;
597                                         case MOUSEDEV_EMUL_EXPS: client->ps2[1] = 4; break;
598                                 }
599                                 client->bufsiz = 2;
600                                 break;
601
602                         case 0xe9: /* Get info */
603                                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
604                                 client->bufsiz = 4;
605                                 break;
606
607                         case 0xff: /* Reset */
608                                 client->impsseq = client->imexseq = 0;
609                                 client->mode = MOUSEDEV_EMUL_PS2;
610                                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
611                                 client->bufsiz = 3;
612                                 break;
613
614                         default:
615                                 client->bufsiz = 1;
616                                 break;
617                 }
618
619                 client->buffer = client->bufsiz;
620         }
621
622         kill_fasync(&client->fasync, SIGIO, POLL_IN);
623
624         wake_up_interruptible(&client->mousedev->wait);
625
626         return count;
627 }
628
629 static ssize_t mousedev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
630 {
631         struct mousedev_client *client = file->private_data;
632         int retval = 0;
633
634         if (!client->ready && !client->buffer && (file->f_flags & O_NONBLOCK))
635                 return -EAGAIN;
636
637         retval = wait_event_interruptible(client->mousedev->wait,
638                                           !client->mousedev->exist || client->ready || client->buffer);
639
640         if (retval)
641                 return retval;
642
643         if (!client->mousedev->exist)
644                 return -ENODEV;
645
646         if (!client->buffer && client->ready) {
647                 mousedev_packet(client, client->ps2);
648                 client->buffer = client->bufsiz;
649         }
650
651         if (count > client->buffer)
652                 count = client->buffer;
653
654         client->buffer -= count;
655
656         if (copy_to_user(buffer, client->ps2 + client->bufsiz - client->buffer - count, count))
657                 return -EFAULT;
658
659         return count;
660 }
661
662 /* No kernel lock - fine */
663 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
664 {
665         struct mousedev_client *client = file->private_data;
666         struct mousedev *mousedev = client->mousedev;
667
668         poll_wait(file, &mousedev->wait, wait);
669         return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
670                 (mousedev->exist ? 0 : (POLLHUP | POLLERR));
671 }
672
673 static const struct file_operations mousedev_fops = {
674         .owner =        THIS_MODULE,
675         .read =         mousedev_read,
676         .write =        mousedev_write,
677         .poll =         mousedev_poll,
678         .open =         mousedev_open,
679         .release =      mousedev_release,
680         .fasync =       mousedev_fasync,
681 };
682
683 static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
684                             const struct input_device_id *id)
685 {
686         struct mousedev *mousedev;
687         struct class_device *cdev;
688         dev_t devt;
689         int minor;
690         int error;
691
692         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
693         if (minor == MOUSEDEV_MINORS) {
694                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
695                 return -ENFILE;
696         }
697
698         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
699         if (!mousedev)
700                 return -ENOMEM;
701
702         INIT_LIST_HEAD(&mousedev->client_list);
703         INIT_LIST_HEAD(&mousedev->mixdev_node);
704         init_waitqueue_head(&mousedev->wait);
705
706         mousedev->minor = minor;
707         mousedev->exist = 1;
708         mousedev->handle.dev = dev;
709         mousedev->handle.name = mousedev->name;
710         mousedev->handle.handler = handler;
711         mousedev->handle.private = mousedev;
712         sprintf(mousedev->name, "mouse%d", minor);
713
714         mousedev_table[minor] = mousedev;
715
716         devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
717
718         cdev = class_device_create(&input_class, &dev->cdev, devt,
719                                    dev->cdev.dev, mousedev->name);
720         if (IS_ERR(cdev)) {
721                 error = PTR_ERR(cdev);
722                 goto err_free_mousedev;
723         }
724
725         /* temporary symlink to keep userspace happy */
726         error = sysfs_create_link(&input_class.subsys.kobj,
727                                   &cdev->kobj, mousedev->name);
728         if (error)
729                 goto err_cdev_destroy;
730
731         error = input_register_handle(&mousedev->handle);
732         if (error)
733                 goto err_remove_link;
734
735         error = mixdev_add_device(mousedev);
736         if (error)
737                 goto err_unregister_handle;
738
739         return 0;
740
741  err_unregister_handle:
742         input_unregister_handle(&mousedev->handle);
743  err_remove_link:
744         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
745  err_cdev_destroy:
746         class_device_destroy(&input_class, devt);
747  err_free_mousedev:
748         mousedev_table[minor] = NULL;
749         kfree(mousedev);
750         return error;
751 }
752
753 static void mousedev_disconnect(struct input_handle *handle)
754 {
755         struct mousedev *mousedev = handle->private;
756         struct mousedev_client *client;
757
758         input_unregister_handle(handle);
759
760         sysfs_remove_link(&input_class.subsys.kobj, mousedev->name);
761         class_device_destroy(&input_class,
762                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
763         mousedev->exist = 0;
764
765         mixdev_remove_device(mousedev);
766
767         if (mousedev->open) {
768                 input_close_device(handle);
769                 wake_up_interruptible(&mousedev->wait);
770                 list_for_each_entry(client, &mousedev->client_list, node)
771                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
772         } else
773                 mousedev_free(mousedev);
774 }
775
776 static const struct input_device_id mousedev_ids[] = {
777         {
778                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
779                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
780                 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
781                 .relbit = { BIT(REL_X) | BIT(REL_Y) },
782         },      /* A mouse like device, at least one button, two relative axes */
783         {
784                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
785                 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
786                 .relbit = { BIT(REL_WHEEL) },
787         },      /* A separate scrollwheel */
788         {
789                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
790                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
791                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
792                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
793         },      /* A tablet like device, at least touch detection, two absolute axes */
794         {
795                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
796                 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
797                 .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
798                 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
799         },      /* A touchpad */
800
801         { },    /* Terminating entry */
802 };
803
804 MODULE_DEVICE_TABLE(input, mousedev_ids);
805
806 static struct input_handler mousedev_handler = {
807         .event =        mousedev_event,
808         .connect =      mousedev_connect,
809         .disconnect =   mousedev_disconnect,
810         .fops =         &mousedev_fops,
811         .minor =        MOUSEDEV_MINOR_BASE,
812         .name =         "mousedev",
813         .id_table =     mousedev_ids,
814 };
815
816 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
817 static struct miscdevice psaux_mouse = {
818         PSMOUSE_MINOR, "psaux", &mousedev_fops
819 };
820 static int psaux_registered;
821 #endif
822
823 static int __init mousedev_init(void)
824 {
825         struct class_device *cdev;
826         int error;
827
828         error = input_register_handler(&mousedev_handler);
829         if (error)
830                 return error;
831
832         memset(&mousedev_mix, 0, sizeof(struct mousedev));
833         INIT_LIST_HEAD(&mousedev_mix.client_list);
834         init_waitqueue_head(&mousedev_mix.wait);
835         mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
836         mousedev_mix.exist = 1;
837         mousedev_mix.minor = MOUSEDEV_MIX;
838
839         cdev = class_device_create(&input_class, NULL,
840                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");
841         if (IS_ERR(cdev)) {
842                 input_unregister_handler(&mousedev_handler);
843                 return PTR_ERR(cdev);
844         }
845
846 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
847         error = misc_register(&psaux_mouse);
848         if (error)
849                 printk(KERN_WARNING "mice: could not register psaux device, "
850                         "error: %d\n", error);
851         else
852                 psaux_registered = 1;
853 #endif
854
855         printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
856
857         return 0;
858 }
859
860 static void __exit mousedev_exit(void)
861 {
862 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
863         if (psaux_registered)
864                 misc_deregister(&psaux_mouse);
865 #endif
866         class_device_destroy(&input_class,
867                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
868         input_unregister_handler(&mousedev_handler);
869 }
870
871 module_init(mousedev_init);
872 module_exit(mousedev_exit);