cpupower: Rename package from cpupowerutils to cpupower
[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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #define MOUSEDEV_MINOR_BASE     32
15 #define MOUSEDEV_MINORS         32
16 #define MOUSEDEV_MIX            31
17
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/poll.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/input.h>
24 #include <linux/random.h>
25 #include <linux/major.h>
26 #include <linux/device.h>
27 #include <linux/kernel.h>
28 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
29 #include <linux/miscdevice.h>
30 #endif
31
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
34 MODULE_LICENSE("GPL");
35
36 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
37 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024
38 #endif
39 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
40 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768
41 #endif
42
43 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
44 module_param(xres, uint, 0644);
45 MODULE_PARM_DESC(xres, "Horizontal screen resolution");
46
47 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
48 module_param(yres, uint, 0644);
49 MODULE_PARM_DESC(yres, "Vertical screen resolution");
50
51 static unsigned tap_time = 200;
52 module_param(tap_time, uint, 0644);
53 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
54
55 struct mousedev_hw_data {
56         int dx, dy, dz;
57         int x, y;
58         int abs_event;
59         unsigned long buttons;
60 };
61
62 struct mousedev {
63         int open;
64         int minor;
65         struct input_handle handle;
66         wait_queue_head_t wait;
67         struct list_head client_list;
68         spinlock_t client_lock; /* protects client_list */
69         struct mutex mutex;
70         struct device dev;
71         bool exist;
72
73         struct list_head mixdev_node;
74         int mixdev_open;
75
76         struct mousedev_hw_data packet;
77         unsigned int pkt_count;
78         int old_x[4], old_y[4];
79         int frac_dx, frac_dy;
80         unsigned long touch;
81 };
82
83 enum mousedev_emul {
84         MOUSEDEV_EMUL_PS2,
85         MOUSEDEV_EMUL_IMPS,
86         MOUSEDEV_EMUL_EXPS
87 };
88
89 struct mousedev_motion {
90         int dx, dy, dz;
91         unsigned long buttons;
92 };
93
94 #define PACKET_QUEUE_LEN        16
95 struct mousedev_client {
96         struct fasync_struct *fasync;
97         struct mousedev *mousedev;
98         struct list_head node;
99
100         struct mousedev_motion packets[PACKET_QUEUE_LEN];
101         unsigned int head, tail;
102         spinlock_t packet_lock;
103         int pos_x, pos_y;
104
105         signed char ps2[6];
106         unsigned char ready, buffer, bufsiz;
107         unsigned char imexseq, impsseq;
108         enum mousedev_emul mode;
109         unsigned long last_buttons;
110 };
111
112 #define MOUSEDEV_SEQ_LEN        6
113
114 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
115 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
116
117 static struct input_handler mousedev_handler;
118
119 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
120 static DEFINE_MUTEX(mousedev_table_mutex);
121 static struct mousedev *mousedev_mix;
122 static LIST_HEAD(mousedev_mix_list);
123
124 static void mixdev_open_devices(void);
125 static void mixdev_close_devices(void);
126
127 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
128 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
129
130 static void mousedev_touchpad_event(struct input_dev *dev,
131                                     struct mousedev *mousedev,
132                                     unsigned int code, int value)
133 {
134         int size, tmp;
135         enum { FRACTION_DENOM = 128 };
136
137         switch (code) {
138
139         case ABS_X:
140
141                 fx(0) = value;
142                 if (mousedev->touch && mousedev->pkt_count >= 2) {
143                         size = input_abs_get_max(dev, ABS_X) -
144                                         input_abs_get_min(dev, ABS_X);
145                         if (size == 0)
146                                 size = 256 * 2;
147
148                         tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
149                         tmp += mousedev->frac_dx;
150                         mousedev->packet.dx = tmp / FRACTION_DENOM;
151                         mousedev->frac_dx =
152                                 tmp - mousedev->packet.dx * FRACTION_DENOM;
153                 }
154                 break;
155
156         case ABS_Y:
157                 fy(0) = value;
158                 if (mousedev->touch && mousedev->pkt_count >= 2) {
159                         /* use X size for ABS_Y to keep the same scale */
160                         size = input_abs_get_max(dev, ABS_X) -
161                                         input_abs_get_min(dev, ABS_X);
162                         if (size == 0)
163                                 size = 256 * 2;
164
165                         tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
166                         tmp += mousedev->frac_dy;
167                         mousedev->packet.dy = tmp / FRACTION_DENOM;
168                         mousedev->frac_dy = tmp -
169                                 mousedev->packet.dy * FRACTION_DENOM;
170                 }
171                 break;
172         }
173 }
174
175 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
176                                 unsigned int code, int value)
177 {
178         int min, max, size;
179
180         switch (code) {
181
182         case ABS_X:
183                 min = input_abs_get_min(dev, ABS_X);
184                 max = input_abs_get_max(dev, ABS_X);
185
186                 size = max - min;
187                 if (size == 0)
188                         size = xres ? : 1;
189
190                 value = clamp(value, min, max);
191
192                 mousedev->packet.x = ((value - min) * xres) / size;
193                 mousedev->packet.abs_event = 1;
194                 break;
195
196         case ABS_Y:
197                 min = input_abs_get_min(dev, ABS_Y);
198                 max = input_abs_get_max(dev, ABS_Y);
199
200                 size = max - min;
201                 if (size == 0)
202                         size = yres ? : 1;
203
204                 value = clamp(value, min, max);
205
206                 mousedev->packet.y = yres - ((value - min) * yres) / size;
207                 mousedev->packet.abs_event = 1;
208                 break;
209         }
210 }
211
212 static void mousedev_rel_event(struct mousedev *mousedev,
213                                 unsigned int code, int value)
214 {
215         switch (code) {
216         case REL_X:
217                 mousedev->packet.dx += value;
218                 break;
219
220         case REL_Y:
221                 mousedev->packet.dy -= value;
222                 break;
223
224         case REL_WHEEL:
225                 mousedev->packet.dz -= value;
226                 break;
227         }
228 }
229
230 static void mousedev_key_event(struct mousedev *mousedev,
231                                 unsigned int code, int value)
232 {
233         int index;
234
235         switch (code) {
236
237         case BTN_TOUCH:
238         case BTN_0:
239         case BTN_LEFT:          index = 0; break;
240
241         case BTN_STYLUS:
242         case BTN_1:
243         case BTN_RIGHT:         index = 1; break;
244
245         case BTN_2:
246         case BTN_FORWARD:
247         case BTN_STYLUS2:
248         case BTN_MIDDLE:        index = 2; break;
249
250         case BTN_3:
251         case BTN_BACK:
252         case BTN_SIDE:          index = 3; break;
253
254         case BTN_4:
255         case BTN_EXTRA:         index = 4; break;
256
257         default:                return;
258         }
259
260         if (value) {
261                 set_bit(index, &mousedev->packet.buttons);
262                 set_bit(index, &mousedev_mix->packet.buttons);
263         } else {
264                 clear_bit(index, &mousedev->packet.buttons);
265                 clear_bit(index, &mousedev_mix->packet.buttons);
266         }
267 }
268
269 static void mousedev_notify_readers(struct mousedev *mousedev,
270                                     struct mousedev_hw_data *packet)
271 {
272         struct mousedev_client *client;
273         struct mousedev_motion *p;
274         unsigned int new_head;
275         int wake_readers = 0;
276
277         rcu_read_lock();
278         list_for_each_entry_rcu(client, &mousedev->client_list, node) {
279
280                 /* Just acquire the lock, interrupts already disabled */
281                 spin_lock(&client->packet_lock);
282
283                 p = &client->packets[client->head];
284                 if (client->ready && p->buttons != mousedev->packet.buttons) {
285                         new_head = (client->head + 1) % PACKET_QUEUE_LEN;
286                         if (new_head != client->tail) {
287                                 p = &client->packets[client->head = new_head];
288                                 memset(p, 0, sizeof(struct mousedev_motion));
289                         }
290                 }
291
292                 if (packet->abs_event) {
293                         p->dx += packet->x - client->pos_x;
294                         p->dy += packet->y - client->pos_y;
295                         client->pos_x = packet->x;
296                         client->pos_y = packet->y;
297                 }
298
299                 client->pos_x += packet->dx;
300                 client->pos_x = client->pos_x < 0 ?
301                         0 : (client->pos_x >= xres ? xres : client->pos_x);
302                 client->pos_y += packet->dy;
303                 client->pos_y = client->pos_y < 0 ?
304                         0 : (client->pos_y >= yres ? yres : client->pos_y);
305
306                 p->dx += packet->dx;
307                 p->dy += packet->dy;
308                 p->dz += packet->dz;
309                 p->buttons = mousedev->packet.buttons;
310
311                 if (p->dx || p->dy || p->dz ||
312                     p->buttons != client->last_buttons)
313                         client->ready = 1;
314
315                 spin_unlock(&client->packet_lock);
316
317                 if (client->ready) {
318                         kill_fasync(&client->fasync, SIGIO, POLL_IN);
319                         wake_readers = 1;
320                 }
321         }
322         rcu_read_unlock();
323
324         if (wake_readers)
325                 wake_up_interruptible(&mousedev->wait);
326 }
327
328 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
329 {
330         if (!value) {
331                 if (mousedev->touch &&
332                     time_before(jiffies,
333                                 mousedev->touch + msecs_to_jiffies(tap_time))) {
334                         /*
335                          * Toggle left button to emulate tap.
336                          * We rely on the fact that mousedev_mix always has 0
337                          * motion packet so we won't mess current position.
338                          */
339                         set_bit(0, &mousedev->packet.buttons);
340                         set_bit(0, &mousedev_mix->packet.buttons);
341                         mousedev_notify_readers(mousedev, &mousedev_mix->packet);
342                         mousedev_notify_readers(mousedev_mix,
343                                                 &mousedev_mix->packet);
344                         clear_bit(0, &mousedev->packet.buttons);
345                         clear_bit(0, &mousedev_mix->packet.buttons);
346                 }
347                 mousedev->touch = mousedev->pkt_count = 0;
348                 mousedev->frac_dx = 0;
349                 mousedev->frac_dy = 0;
350
351         } else if (!mousedev->touch)
352                 mousedev->touch = jiffies;
353 }
354
355 static void mousedev_event(struct input_handle *handle,
356                            unsigned int type, unsigned int code, int value)
357 {
358         struct mousedev *mousedev = handle->private;
359
360         switch (type) {
361
362         case EV_ABS:
363                 /* Ignore joysticks */
364                 if (test_bit(BTN_TRIGGER, handle->dev->keybit))
365                         return;
366
367                 if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
368                         mousedev_touchpad_event(handle->dev,
369                                                 mousedev, code, value);
370                 else
371                         mousedev_abs_event(handle->dev, mousedev, code, value);
372
373                 break;
374
375         case EV_REL:
376                 mousedev_rel_event(mousedev, code, value);
377                 break;
378
379         case EV_KEY:
380                 if (value != 2) {
381                         if (code == BTN_TOUCH &&
382                             test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
383                                 mousedev_touchpad_touch(mousedev, value);
384                         else
385                                 mousedev_key_event(mousedev, code, value);
386                 }
387                 break;
388
389         case EV_SYN:
390                 if (code == SYN_REPORT) {
391                         if (mousedev->touch) {
392                                 mousedev->pkt_count++;
393                                 /*
394                                  * Input system eats duplicate events,
395                                  * but we need all of them to do correct
396                                  * averaging so apply present one forward
397                                  */
398                                 fx(0) = fx(1);
399                                 fy(0) = fy(1);
400                         }
401
402                         mousedev_notify_readers(mousedev, &mousedev->packet);
403                         mousedev_notify_readers(mousedev_mix, &mousedev->packet);
404
405                         mousedev->packet.dx = mousedev->packet.dy =
406                                 mousedev->packet.dz = 0;
407                         mousedev->packet.abs_event = 0;
408                 }
409                 break;
410         }
411 }
412
413 static int mousedev_fasync(int fd, struct file *file, int on)
414 {
415         struct mousedev_client *client = file->private_data;
416
417         return fasync_helper(fd, file, on, &client->fasync);
418 }
419
420 static void mousedev_free(struct device *dev)
421 {
422         struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
423
424         input_put_device(mousedev->handle.dev);
425         kfree(mousedev);
426 }
427
428 static int mousedev_open_device(struct mousedev *mousedev)
429 {
430         int retval;
431
432         retval = mutex_lock_interruptible(&mousedev->mutex);
433         if (retval)
434                 return retval;
435
436         if (mousedev->minor == MOUSEDEV_MIX)
437                 mixdev_open_devices();
438         else if (!mousedev->exist)
439                 retval = -ENODEV;
440         else if (!mousedev->open++) {
441                 retval = input_open_device(&mousedev->handle);
442                 if (retval)
443                         mousedev->open--;
444         }
445
446         mutex_unlock(&mousedev->mutex);
447         return retval;
448 }
449
450 static void mousedev_close_device(struct mousedev *mousedev)
451 {
452         mutex_lock(&mousedev->mutex);
453
454         if (mousedev->minor == MOUSEDEV_MIX)
455                 mixdev_close_devices();
456         else if (mousedev->exist && !--mousedev->open)
457                 input_close_device(&mousedev->handle);
458
459         mutex_unlock(&mousedev->mutex);
460 }
461
462 /*
463  * Open all available devices so they can all be multiplexed in one.
464  * stream. Note that this function is called with mousedev_mix->mutex
465  * held.
466  */
467 static void mixdev_open_devices(void)
468 {
469         struct mousedev *mousedev;
470
471         if (mousedev_mix->open++)
472                 return;
473
474         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
475                 if (!mousedev->mixdev_open) {
476                         if (mousedev_open_device(mousedev))
477                                 continue;
478
479                         mousedev->mixdev_open = 1;
480                 }
481         }
482 }
483
484 /*
485  * Close all devices that were opened as part of multiplexed
486  * device. Note that this function is called with mousedev_mix->mutex
487  * held.
488  */
489 static void mixdev_close_devices(void)
490 {
491         struct mousedev *mousedev;
492
493         if (--mousedev_mix->open)
494                 return;
495
496         list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
497                 if (mousedev->mixdev_open) {
498                         mousedev->mixdev_open = 0;
499                         mousedev_close_device(mousedev);
500                 }
501         }
502 }
503
504
505 static void mousedev_attach_client(struct mousedev *mousedev,
506                                    struct mousedev_client *client)
507 {
508         spin_lock(&mousedev->client_lock);
509         list_add_tail_rcu(&client->node, &mousedev->client_list);
510         spin_unlock(&mousedev->client_lock);
511 }
512
513 static void mousedev_detach_client(struct mousedev *mousedev,
514                                    struct mousedev_client *client)
515 {
516         spin_lock(&mousedev->client_lock);
517         list_del_rcu(&client->node);
518         spin_unlock(&mousedev->client_lock);
519         synchronize_rcu();
520 }
521
522 static int mousedev_release(struct inode *inode, struct file *file)
523 {
524         struct mousedev_client *client = file->private_data;
525         struct mousedev *mousedev = client->mousedev;
526
527         mousedev_detach_client(mousedev, client);
528         kfree(client);
529
530         mousedev_close_device(mousedev);
531         put_device(&mousedev->dev);
532
533         return 0;
534 }
535
536 static int mousedev_open(struct inode *inode, struct file *file)
537 {
538         struct mousedev_client *client;
539         struct mousedev *mousedev;
540         int error;
541         int i;
542
543 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
544         if (imajor(inode) == MISC_MAJOR)
545                 i = MOUSEDEV_MIX;
546         else
547 #endif
548                 i = iminor(inode) - MOUSEDEV_MINOR_BASE;
549
550         if (i >= MOUSEDEV_MINORS)
551                 return -ENODEV;
552
553         error = mutex_lock_interruptible(&mousedev_table_mutex);
554         if (error) {
555                 return error;
556         }
557         mousedev = mousedev_table[i];
558         if (mousedev)
559                 get_device(&mousedev->dev);
560         mutex_unlock(&mousedev_table_mutex);
561
562         if (!mousedev) {
563                 return -ENODEV;
564         }
565
566         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
567         if (!client) {
568                 error = -ENOMEM;
569                 goto err_put_mousedev;
570         }
571
572         spin_lock_init(&client->packet_lock);
573         client->pos_x = xres / 2;
574         client->pos_y = yres / 2;
575         client->mousedev = mousedev;
576         mousedev_attach_client(mousedev, client);
577
578         error = mousedev_open_device(mousedev);
579         if (error)
580                 goto err_free_client;
581
582         file->private_data = client;
583         return 0;
584
585  err_free_client:
586         mousedev_detach_client(mousedev, client);
587         kfree(client);
588  err_put_mousedev:
589         put_device(&mousedev->dev);
590         return error;
591 }
592
593 static inline int mousedev_limit_delta(int delta, int limit)
594 {
595         return delta > limit ? limit : (delta < -limit ? -limit : delta);
596 }
597
598 static void mousedev_packet(struct mousedev_client *client,
599                             signed char *ps2_data)
600 {
601         struct mousedev_motion *p = &client->packets[client->tail];
602
603         ps2_data[0] = 0x08 |
604                 ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
605         ps2_data[1] = mousedev_limit_delta(p->dx, 127);
606         ps2_data[2] = mousedev_limit_delta(p->dy, 127);
607         p->dx -= ps2_data[1];
608         p->dy -= ps2_data[2];
609
610         switch (client->mode) {
611         case MOUSEDEV_EMUL_EXPS:
612                 ps2_data[3] = mousedev_limit_delta(p->dz, 7);
613                 p->dz -= ps2_data[3];
614                 ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
615                 client->bufsiz = 4;
616                 break;
617
618         case MOUSEDEV_EMUL_IMPS:
619                 ps2_data[0] |=
620                         ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
621                 ps2_data[3] = mousedev_limit_delta(p->dz, 127);
622                 p->dz -= ps2_data[3];
623                 client->bufsiz = 4;
624                 break;
625
626         case MOUSEDEV_EMUL_PS2:
627         default:
628                 ps2_data[0] |=
629                         ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
630                 p->dz = 0;
631                 client->bufsiz = 3;
632                 break;
633         }
634
635         if (!p->dx && !p->dy && !p->dz) {
636                 if (client->tail == client->head) {
637                         client->ready = 0;
638                         client->last_buttons = p->buttons;
639                 } else
640                         client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
641         }
642 }
643
644 static void mousedev_generate_response(struct mousedev_client *client,
645                                         int command)
646 {
647         client->ps2[0] = 0xfa; /* ACK */
648
649         switch (command) {
650
651         case 0xeb: /* Poll */
652                 mousedev_packet(client, &client->ps2[1]);
653                 client->bufsiz++; /* account for leading ACK */
654                 break;
655
656         case 0xf2: /* Get ID */
657                 switch (client->mode) {
658                 case MOUSEDEV_EMUL_PS2:
659                         client->ps2[1] = 0;
660                         break;
661                 case MOUSEDEV_EMUL_IMPS:
662                         client->ps2[1] = 3;
663                         break;
664                 case MOUSEDEV_EMUL_EXPS:
665                         client->ps2[1] = 4;
666                         break;
667                 }
668                 client->bufsiz = 2;
669                 break;
670
671         case 0xe9: /* Get info */
672                 client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
673                 client->bufsiz = 4;
674                 break;
675
676         case 0xff: /* Reset */
677                 client->impsseq = client->imexseq = 0;
678                 client->mode = MOUSEDEV_EMUL_PS2;
679                 client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
680                 client->bufsiz = 3;
681                 break;
682
683         default:
684                 client->bufsiz = 1;
685                 break;
686         }
687         client->buffer = client->bufsiz;
688 }
689
690 static ssize_t mousedev_write(struct file *file, const char __user *buffer,
691                                 size_t count, loff_t *ppos)
692 {
693         struct mousedev_client *client = file->private_data;
694         unsigned char c;
695         unsigned int i;
696
697         for (i = 0; i < count; i++) {
698
699                 if (get_user(c, buffer + i))
700                         return -EFAULT;
701
702                 spin_lock_irq(&client->packet_lock);
703
704                 if (c == mousedev_imex_seq[client->imexseq]) {
705                         if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
706                                 client->imexseq = 0;
707                                 client->mode = MOUSEDEV_EMUL_EXPS;
708                         }
709                 } else
710                         client->imexseq = 0;
711
712                 if (c == mousedev_imps_seq[client->impsseq]) {
713                         if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
714                                 client->impsseq = 0;
715                                 client->mode = MOUSEDEV_EMUL_IMPS;
716                         }
717                 } else
718                         client->impsseq = 0;
719
720                 mousedev_generate_response(client, c);
721
722                 spin_unlock_irq(&client->packet_lock);
723         }
724
725         kill_fasync(&client->fasync, SIGIO, POLL_IN);
726         wake_up_interruptible(&client->mousedev->wait);
727
728         return count;
729 }
730
731 static ssize_t mousedev_read(struct file *file, char __user *buffer,
732                              size_t count, loff_t *ppos)
733 {
734         struct mousedev_client *client = file->private_data;
735         struct mousedev *mousedev = client->mousedev;
736         signed char data[sizeof(client->ps2)];
737         int retval = 0;
738
739         if (!client->ready && !client->buffer && mousedev->exist &&
740             (file->f_flags & O_NONBLOCK))
741                 return -EAGAIN;
742
743         retval = wait_event_interruptible(mousedev->wait,
744                         !mousedev->exist || client->ready || client->buffer);
745         if (retval)
746                 return retval;
747
748         if (!mousedev->exist)
749                 return -ENODEV;
750
751         spin_lock_irq(&client->packet_lock);
752
753         if (!client->buffer && client->ready) {
754                 mousedev_packet(client, client->ps2);
755                 client->buffer = client->bufsiz;
756         }
757
758         if (count > client->buffer)
759                 count = client->buffer;
760
761         memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
762         client->buffer -= count;
763
764         spin_unlock_irq(&client->packet_lock);
765
766         if (copy_to_user(buffer, data, count))
767                 return -EFAULT;
768
769         return count;
770 }
771
772 /* No kernel lock - fine */
773 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
774 {
775         struct mousedev_client *client = file->private_data;
776         struct mousedev *mousedev = client->mousedev;
777         unsigned int mask;
778
779         poll_wait(file, &mousedev->wait, wait);
780
781         mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
782         if (client->ready || client->buffer)
783                 mask |= POLLIN | POLLRDNORM;
784
785         return mask;
786 }
787
788 static const struct file_operations mousedev_fops = {
789         .owner =        THIS_MODULE,
790         .read =         mousedev_read,
791         .write =        mousedev_write,
792         .poll =         mousedev_poll,
793         .open =         mousedev_open,
794         .release =      mousedev_release,
795         .fasync =       mousedev_fasync,
796         .llseek = noop_llseek,
797 };
798
799 static int mousedev_install_chrdev(struct mousedev *mousedev)
800 {
801         mousedev_table[mousedev->minor] = mousedev;
802         return 0;
803 }
804
805 static void mousedev_remove_chrdev(struct mousedev *mousedev)
806 {
807         mutex_lock(&mousedev_table_mutex);
808         mousedev_table[mousedev->minor] = NULL;
809         mutex_unlock(&mousedev_table_mutex);
810 }
811
812 /*
813  * Mark device non-existent. This disables writes, ioctls and
814  * prevents new users from opening the device. Already posted
815  * blocking reads will stay, however new ones will fail.
816  */
817 static void mousedev_mark_dead(struct mousedev *mousedev)
818 {
819         mutex_lock(&mousedev->mutex);
820         mousedev->exist = false;
821         mutex_unlock(&mousedev->mutex);
822 }
823
824 /*
825  * Wake up users waiting for IO so they can disconnect from
826  * dead device.
827  */
828 static void mousedev_hangup(struct mousedev *mousedev)
829 {
830         struct mousedev_client *client;
831
832         spin_lock(&mousedev->client_lock);
833         list_for_each_entry(client, &mousedev->client_list, node)
834                 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
835         spin_unlock(&mousedev->client_lock);
836
837         wake_up_interruptible(&mousedev->wait);
838 }
839
840 static void mousedev_cleanup(struct mousedev *mousedev)
841 {
842         struct input_handle *handle = &mousedev->handle;
843
844         mousedev_mark_dead(mousedev);
845         mousedev_hangup(mousedev);
846         mousedev_remove_chrdev(mousedev);
847
848         /* mousedev is marked dead so no one else accesses mousedev->open */
849         if (mousedev->open)
850                 input_close_device(handle);
851 }
852
853 static struct mousedev *mousedev_create(struct input_dev *dev,
854                                         struct input_handler *handler,
855                                         int minor)
856 {
857         struct mousedev *mousedev;
858         int error;
859
860         mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
861         if (!mousedev) {
862                 error = -ENOMEM;
863                 goto err_out;
864         }
865
866         INIT_LIST_HEAD(&mousedev->client_list);
867         INIT_LIST_HEAD(&mousedev->mixdev_node);
868         spin_lock_init(&mousedev->client_lock);
869         mutex_init(&mousedev->mutex);
870         lockdep_set_subclass(&mousedev->mutex,
871                              minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0);
872         init_waitqueue_head(&mousedev->wait);
873
874         if (minor == MOUSEDEV_MIX)
875                 dev_set_name(&mousedev->dev, "mice");
876         else
877                 dev_set_name(&mousedev->dev, "mouse%d", minor);
878
879         mousedev->minor = minor;
880         mousedev->exist = true;
881         mousedev->handle.dev = input_get_device(dev);
882         mousedev->handle.name = dev_name(&mousedev->dev);
883         mousedev->handle.handler = handler;
884         mousedev->handle.private = mousedev;
885
886         mousedev->dev.class = &input_class;
887         if (dev)
888                 mousedev->dev.parent = &dev->dev;
889         mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
890         mousedev->dev.release = mousedev_free;
891         device_initialize(&mousedev->dev);
892
893         if (minor != MOUSEDEV_MIX) {
894                 error = input_register_handle(&mousedev->handle);
895                 if (error)
896                         goto err_free_mousedev;
897         }
898
899         error = mousedev_install_chrdev(mousedev);
900         if (error)
901                 goto err_unregister_handle;
902
903         error = device_add(&mousedev->dev);
904         if (error)
905                 goto err_cleanup_mousedev;
906
907         return mousedev;
908
909  err_cleanup_mousedev:
910         mousedev_cleanup(mousedev);
911  err_unregister_handle:
912         if (minor != MOUSEDEV_MIX)
913                 input_unregister_handle(&mousedev->handle);
914  err_free_mousedev:
915         put_device(&mousedev->dev);
916  err_out:
917         return ERR_PTR(error);
918 }
919
920 static void mousedev_destroy(struct mousedev *mousedev)
921 {
922         device_del(&mousedev->dev);
923         mousedev_cleanup(mousedev);
924         if (mousedev->minor != MOUSEDEV_MIX)
925                 input_unregister_handle(&mousedev->handle);
926         put_device(&mousedev->dev);
927 }
928
929 static int mixdev_add_device(struct mousedev *mousedev)
930 {
931         int retval;
932
933         retval = mutex_lock_interruptible(&mousedev_mix->mutex);
934         if (retval)
935                 return retval;
936
937         if (mousedev_mix->open) {
938                 retval = mousedev_open_device(mousedev);
939                 if (retval)
940                         goto out;
941
942                 mousedev->mixdev_open = 1;
943         }
944
945         get_device(&mousedev->dev);
946         list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);
947
948  out:
949         mutex_unlock(&mousedev_mix->mutex);
950         return retval;
951 }
952
953 static void mixdev_remove_device(struct mousedev *mousedev)
954 {
955         mutex_lock(&mousedev_mix->mutex);
956
957         if (mousedev->mixdev_open) {
958                 mousedev->mixdev_open = 0;
959                 mousedev_close_device(mousedev);
960         }
961
962         list_del_init(&mousedev->mixdev_node);
963         mutex_unlock(&mousedev_mix->mutex);
964
965         put_device(&mousedev->dev);
966 }
967
968 static int mousedev_connect(struct input_handler *handler,
969                             struct input_dev *dev,
970                             const struct input_device_id *id)
971 {
972         struct mousedev *mousedev;
973         int minor;
974         int error;
975
976         for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
977                 if (!mousedev_table[minor])
978                         break;
979
980         if (minor == MOUSEDEV_MINORS) {
981                 pr_err("no more free mousedev devices\n");
982                 return -ENFILE;
983         }
984
985         mousedev = mousedev_create(dev, handler, minor);
986         if (IS_ERR(mousedev))
987                 return PTR_ERR(mousedev);
988
989         error = mixdev_add_device(mousedev);
990         if (error) {
991                 mousedev_destroy(mousedev);
992                 return error;
993         }
994
995         return 0;
996 }
997
998 static void mousedev_disconnect(struct input_handle *handle)
999 {
1000         struct mousedev *mousedev = handle->private;
1001
1002         mixdev_remove_device(mousedev);
1003         mousedev_destroy(mousedev);
1004 }
1005
1006 static const struct input_device_id mousedev_ids[] = {
1007         {
1008                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1009                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
1010                                 INPUT_DEVICE_ID_MATCH_RELBIT,
1011                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1012                 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1013                 .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
1014         },      /* A mouse like device, at least one button,
1015                    two relative axes */
1016         {
1017                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1018                                 INPUT_DEVICE_ID_MATCH_RELBIT,
1019                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
1020                 .relbit = { BIT_MASK(REL_WHEEL) },
1021         },      /* A separate scrollwheel */
1022         {
1023                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1024                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
1025                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1026                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1027                 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
1028                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1029         },      /* A tablet like device, at least touch detection,
1030                    two absolute axes */
1031         {
1032                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1033                                 INPUT_DEVICE_ID_MATCH_KEYBIT |
1034                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
1035                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1036                 .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
1037                                 BIT_MASK(BTN_TOOL_FINGER) },
1038                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
1039                                 BIT_MASK(ABS_PRESSURE) |
1040                                 BIT_MASK(ABS_TOOL_WIDTH) },
1041         },      /* A touchpad */
1042         {
1043                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1044                         INPUT_DEVICE_ID_MATCH_KEYBIT |
1045                         INPUT_DEVICE_ID_MATCH_ABSBIT,
1046                 .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
1047                 .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
1048                 .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
1049         },      /* Mouse-like device with absolute X and Y but ordinary
1050                    clicks, like hp ILO2 High Performance mouse */
1051
1052         { },    /* Terminating entry */
1053 };
1054
1055 MODULE_DEVICE_TABLE(input, mousedev_ids);
1056
1057 static struct input_handler mousedev_handler = {
1058         .event =        mousedev_event,
1059         .connect =      mousedev_connect,
1060         .disconnect =   mousedev_disconnect,
1061         .fops =         &mousedev_fops,
1062         .minor =        MOUSEDEV_MINOR_BASE,
1063         .name =         "mousedev",
1064         .id_table =     mousedev_ids,
1065 };
1066
1067 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1068 static struct miscdevice psaux_mouse = {
1069         PSMOUSE_MINOR, "psaux", &mousedev_fops
1070 };
1071 static int psaux_registered;
1072 #endif
1073
1074 static int __init mousedev_init(void)
1075 {
1076         int error;
1077
1078         mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
1079         if (IS_ERR(mousedev_mix))
1080                 return PTR_ERR(mousedev_mix);
1081
1082         error = input_register_handler(&mousedev_handler);
1083         if (error) {
1084                 mousedev_destroy(mousedev_mix);
1085                 return error;
1086         }
1087
1088 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1089         error = misc_register(&psaux_mouse);
1090         if (error)
1091                 pr_warning("could not register psaux device, error: %d\n",
1092                            error);
1093         else
1094                 psaux_registered = 1;
1095 #endif
1096
1097         pr_info("PS/2 mouse device common for all mice\n");
1098
1099         return 0;
1100 }
1101
1102 static void __exit mousedev_exit(void)
1103 {
1104 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
1105         if (psaux_registered)
1106                 misc_deregister(&psaux_mouse);
1107 #endif
1108         input_unregister_handler(&mousedev_handler);
1109         mousedev_destroy(mousedev_mix);
1110 }
1111
1112 module_init(mousedev_init);
1113 module_exit(mousedev_exit);