Root/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
32MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
34MODULE_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
43static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
44module_param(xres, uint, 0644);
45MODULE_PARM_DESC(xres, "Horizontal screen resolution");
46
47static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
48module_param(yres, uint, 0644);
49MODULE_PARM_DESC(yres, "Vertical screen resolution");
50
51static unsigned tap_time = 200;
52module_param(tap_time, uint, 0644);
53MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
54
55struct mousedev_hw_data {
56    int dx, dy, dz;
57    int x, y;
58    int abs_event;
59    unsigned long buttons;
60};
61
62struct 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
83enum mousedev_emul {
84    MOUSEDEV_EMUL_PS2,
85    MOUSEDEV_EMUL_IMPS,
86    MOUSEDEV_EMUL_EXPS
87};
88
89struct mousedev_motion {
90    int dx, dy, dz;
91    unsigned long buttons;
92};
93
94#define PACKET_QUEUE_LEN 16
95struct 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
114static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
115static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
116
117static struct input_handler mousedev_handler;
118
119static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
120static DEFINE_MUTEX(mousedev_table_mutex);
121static struct mousedev *mousedev_mix;
122static LIST_HEAD(mousedev_mix_list);
123
124static void mixdev_open_devices(void);
125static 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
130static 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
175static 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
212static 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
230static 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
269static 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
328static 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
355static 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
413static 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
420static 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
428static 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
450static 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 */
467static 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 */
489static 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
505static 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
513static 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
522static 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
536static 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
593static inline int mousedev_limit_delta(int delta, int limit)
594{
595    return delta > limit ? limit : (delta < -limit ? -limit : delta);
596}
597
598static 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
644static 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
690static 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
731static 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 */
773static 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
788static 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
799static int mousedev_install_chrdev(struct mousedev *mousedev)
800{
801    mousedev_table[mousedev->minor] = mousedev;
802    return 0;
803}
804
805static 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 */
817static 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 */
828static 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
840static 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
853static 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
920static 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
929static 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
953static 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
968static 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
998static 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
1006static 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
1055MODULE_DEVICE_TABLE(input, mousedev_ids);
1056
1057static 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
1068static struct miscdevice psaux_mouse = {
1069    PSMOUSE_MINOR, "psaux", &mousedev_fops
1070};
1071static int psaux_registered;
1072#endif
1073
1074static 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
1102static 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
1112module_init(mousedev_init);
1113module_exit(mousedev_exit);
1114

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