Root/drivers/input/joydev.c

1/*
2 * Joystick device driver for the input driver suite.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 1999 Colin Van Dyke
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 as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <asm/io.h>
16#include <linux/delay.h>
17#include <linux/errno.h>
18#include <linux/joystick.h>
19#include <linux/input.h>
20#include <linux/kernel.h>
21#include <linux/major.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/mm.h>
25#include <linux/miscdevice.h>
26#include <linux/module.h>
27#include <linux/poll.h>
28#include <linux/init.h>
29#include <linux/device.h>
30
31MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
32MODULE_DESCRIPTION("Joystick device interfaces");
33MODULE_SUPPORTED_DEVICE("input/js");
34MODULE_LICENSE("GPL");
35
36#define JOYDEV_MINOR_BASE 0
37#define JOYDEV_MINORS 16
38#define JOYDEV_BUFFER_SIZE 64
39
40struct joydev {
41    int open;
42    int minor;
43    struct input_handle handle;
44    wait_queue_head_t wait;
45    struct list_head client_list;
46    spinlock_t client_lock; /* protects client_list */
47    struct mutex mutex;
48    struct device dev;
49    bool exist;
50
51    struct js_corr corr[ABS_CNT];
52    struct JS_DATA_SAVE_TYPE glue;
53    int nabs;
54    int nkey;
55    __u16 keymap[KEY_MAX - BTN_MISC + 1];
56    __u16 keypam[KEY_MAX - BTN_MISC + 1];
57    __u8 absmap[ABS_CNT];
58    __u8 abspam[ABS_CNT];
59    __s16 abs[ABS_CNT];
60};
61
62struct joydev_client {
63    struct js_event buffer[JOYDEV_BUFFER_SIZE];
64    int head;
65    int tail;
66    int startup;
67    spinlock_t buffer_lock; /* protects access to buffer, head and tail */
68    struct fasync_struct *fasync;
69    struct joydev *joydev;
70    struct list_head node;
71};
72
73static struct joydev *joydev_table[JOYDEV_MINORS];
74static DEFINE_MUTEX(joydev_table_mutex);
75
76static int joydev_correct(int value, struct js_corr *corr)
77{
78    switch (corr->type) {
79
80    case JS_CORR_NONE:
81        break;
82
83    case JS_CORR_BROKEN:
84        value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
85            ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
86            ((corr->coef[2] * (value - corr->coef[0])) >> 14);
87        break;
88
89    default:
90        return 0;
91    }
92
93    return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
94}
95
96static void joydev_pass_event(struct joydev_client *client,
97                  struct js_event *event)
98{
99    struct joydev *joydev = client->joydev;
100
101    /*
102     * IRQs already disabled, just acquire the lock
103     */
104    spin_lock(&client->buffer_lock);
105
106    client->buffer[client->head] = *event;
107
108    if (client->startup == joydev->nabs + joydev->nkey) {
109        client->head++;
110        client->head &= JOYDEV_BUFFER_SIZE - 1;
111        if (client->tail == client->head)
112            client->startup = 0;
113    }
114
115    spin_unlock(&client->buffer_lock);
116
117    kill_fasync(&client->fasync, SIGIO, POLL_IN);
118}
119
120static void joydev_event(struct input_handle *handle,
121             unsigned int type, unsigned int code, int value)
122{
123    struct joydev *joydev = handle->private;
124    struct joydev_client *client;
125    struct js_event event;
126
127    switch (type) {
128
129    case EV_KEY:
130        if (code < BTN_MISC || value == 2)
131            return;
132        event.type = JS_EVENT_BUTTON;
133        event.number = joydev->keymap[code - BTN_MISC];
134        event.value = value;
135        break;
136
137    case EV_ABS:
138        event.type = JS_EVENT_AXIS;
139        event.number = joydev->absmap[code];
140        event.value = joydev_correct(value,
141                    &joydev->corr[event.number]);
142        if (event.value == joydev->abs[event.number])
143            return;
144        joydev->abs[event.number] = event.value;
145        break;
146
147    default:
148        return;
149    }
150
151    event.time = jiffies_to_msecs(jiffies);
152
153    rcu_read_lock();
154    list_for_each_entry_rcu(client, &joydev->client_list, node)
155        joydev_pass_event(client, &event);
156    rcu_read_unlock();
157
158    wake_up_interruptible(&joydev->wait);
159}
160
161static int joydev_fasync(int fd, struct file *file, int on)
162{
163    struct joydev_client *client = file->private_data;
164
165    return fasync_helper(fd, file, on, &client->fasync);
166}
167
168static void joydev_free(struct device *dev)
169{
170    struct joydev *joydev = container_of(dev, struct joydev, dev);
171
172    input_put_device(joydev->handle.dev);
173    kfree(joydev);
174}
175
176static void joydev_attach_client(struct joydev *joydev,
177                 struct joydev_client *client)
178{
179    spin_lock(&joydev->client_lock);
180    list_add_tail_rcu(&client->node, &joydev->client_list);
181    spin_unlock(&joydev->client_lock);
182}
183
184static void joydev_detach_client(struct joydev *joydev,
185                 struct joydev_client *client)
186{
187    spin_lock(&joydev->client_lock);
188    list_del_rcu(&client->node);
189    spin_unlock(&joydev->client_lock);
190    synchronize_rcu();
191}
192
193static int joydev_open_device(struct joydev *joydev)
194{
195    int retval;
196
197    retval = mutex_lock_interruptible(&joydev->mutex);
198    if (retval)
199        return retval;
200
201    if (!joydev->exist)
202        retval = -ENODEV;
203    else if (!joydev->open++) {
204        retval = input_open_device(&joydev->handle);
205        if (retval)
206            joydev->open--;
207    }
208
209    mutex_unlock(&joydev->mutex);
210    return retval;
211}
212
213static void joydev_close_device(struct joydev *joydev)
214{
215    mutex_lock(&joydev->mutex);
216
217    if (joydev->exist && !--joydev->open)
218        input_close_device(&joydev->handle);
219
220    mutex_unlock(&joydev->mutex);
221}
222
223/*
224 * Wake up users waiting for IO so they can disconnect from
225 * dead device.
226 */
227static void joydev_hangup(struct joydev *joydev)
228{
229    struct joydev_client *client;
230
231    spin_lock(&joydev->client_lock);
232    list_for_each_entry(client, &joydev->client_list, node)
233        kill_fasync(&client->fasync, SIGIO, POLL_HUP);
234    spin_unlock(&joydev->client_lock);
235
236    wake_up_interruptible(&joydev->wait);
237}
238
239static int joydev_release(struct inode *inode, struct file *file)
240{
241    struct joydev_client *client = file->private_data;
242    struct joydev *joydev = client->joydev;
243
244    joydev_detach_client(joydev, client);
245    kfree(client);
246
247    joydev_close_device(joydev);
248    put_device(&joydev->dev);
249
250    return 0;
251}
252
253static int joydev_open(struct inode *inode, struct file *file)
254{
255    struct joydev_client *client;
256    struct joydev *joydev;
257    int i = iminor(inode) - JOYDEV_MINOR_BASE;
258    int error;
259
260    if (i >= JOYDEV_MINORS)
261        return -ENODEV;
262
263    error = mutex_lock_interruptible(&joydev_table_mutex);
264    if (error)
265        return error;
266    joydev = joydev_table[i];
267    if (joydev)
268        get_device(&joydev->dev);
269    mutex_unlock(&joydev_table_mutex);
270
271    if (!joydev)
272        return -ENODEV;
273
274    client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
275    if (!client) {
276        error = -ENOMEM;
277        goto err_put_joydev;
278    }
279
280    spin_lock_init(&client->buffer_lock);
281    client->joydev = joydev;
282    joydev_attach_client(joydev, client);
283
284    error = joydev_open_device(joydev);
285    if (error)
286        goto err_free_client;
287
288    file->private_data = client;
289    nonseekable_open(inode, file);
290
291    return 0;
292
293 err_free_client:
294    joydev_detach_client(joydev, client);
295    kfree(client);
296 err_put_joydev:
297    put_device(&joydev->dev);
298    return error;
299}
300
301static int joydev_generate_startup_event(struct joydev_client *client,
302                     struct input_dev *input,
303                     struct js_event *event)
304{
305    struct joydev *joydev = client->joydev;
306    int have_event;
307
308    spin_lock_irq(&client->buffer_lock);
309
310    have_event = client->startup < joydev->nabs + joydev->nkey;
311
312    if (have_event) {
313
314        event->time = jiffies_to_msecs(jiffies);
315        if (client->startup < joydev->nkey) {
316            event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
317            event->number = client->startup;
318            event->value = !!test_bit(joydev->keypam[event->number],
319                          input->key);
320        } else {
321            event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
322            event->number = client->startup - joydev->nkey;
323            event->value = joydev->abs[event->number];
324        }
325        client->startup++;
326    }
327
328    spin_unlock_irq(&client->buffer_lock);
329
330    return have_event;
331}
332
333static int joydev_fetch_next_event(struct joydev_client *client,
334                   struct js_event *event)
335{
336    int have_event;
337
338    spin_lock_irq(&client->buffer_lock);
339
340    have_event = client->head != client->tail;
341    if (have_event) {
342        *event = client->buffer[client->tail++];
343        client->tail &= JOYDEV_BUFFER_SIZE - 1;
344    }
345
346    spin_unlock_irq(&client->buffer_lock);
347
348    return have_event;
349}
350
351/*
352 * Old joystick interface
353 */
354static ssize_t joydev_0x_read(struct joydev_client *client,
355                  struct input_dev *input,
356                  char __user *buf)
357{
358    struct joydev *joydev = client->joydev;
359    struct JS_DATA_TYPE data;
360    int i;
361
362    spin_lock_irq(&input->event_lock);
363
364    /*
365     * Get device state
366     */
367    for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
368        data.buttons |=
369            test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
370    data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
371    data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
372
373    /*
374     * Reset reader's event queue
375     */
376    spin_lock(&client->buffer_lock);
377    client->startup = 0;
378    client->tail = client->head;
379    spin_unlock(&client->buffer_lock);
380
381    spin_unlock_irq(&input->event_lock);
382
383    if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
384        return -EFAULT;
385
386    return sizeof(struct JS_DATA_TYPE);
387}
388
389static inline int joydev_data_pending(struct joydev_client *client)
390{
391    struct joydev *joydev = client->joydev;
392
393    return client->startup < joydev->nabs + joydev->nkey ||
394        client->head != client->tail;
395}
396
397static ssize_t joydev_read(struct file *file, char __user *buf,
398               size_t count, loff_t *ppos)
399{
400    struct joydev_client *client = file->private_data;
401    struct joydev *joydev = client->joydev;
402    struct input_dev *input = joydev->handle.dev;
403    struct js_event event;
404    int retval;
405
406    if (!joydev->exist)
407        return -ENODEV;
408
409    if (count < sizeof(struct js_event))
410        return -EINVAL;
411
412    if (count == sizeof(struct JS_DATA_TYPE))
413        return joydev_0x_read(client, input, buf);
414
415    if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
416        return -EAGAIN;
417
418    retval = wait_event_interruptible(joydev->wait,
419            !joydev->exist || joydev_data_pending(client));
420    if (retval)
421        return retval;
422
423    if (!joydev->exist)
424        return -ENODEV;
425
426    while (retval + sizeof(struct js_event) <= count &&
427           joydev_generate_startup_event(client, input, &event)) {
428
429        if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
430            return -EFAULT;
431
432        retval += sizeof(struct js_event);
433    }
434
435    while (retval + sizeof(struct js_event) <= count &&
436           joydev_fetch_next_event(client, &event)) {
437
438        if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
439            return -EFAULT;
440
441        retval += sizeof(struct js_event);
442    }
443
444    return retval;
445}
446
447/* No kernel lock - fine */
448static unsigned int joydev_poll(struct file *file, poll_table *wait)
449{
450    struct joydev_client *client = file->private_data;
451    struct joydev *joydev = client->joydev;
452
453    poll_wait(file, &joydev->wait, wait);
454    return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
455        (joydev->exist ? 0 : (POLLHUP | POLLERR));
456}
457
458static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
459                     void __user *argp, size_t len)
460{
461    __u8 *abspam;
462    int i;
463    int retval = 0;
464
465    len = min(len, sizeof(joydev->abspam));
466
467    /* Validate the map. */
468    abspam = kmalloc(len, GFP_KERNEL);
469    if (!abspam)
470        return -ENOMEM;
471
472    if (copy_from_user(abspam, argp, len)) {
473        retval = -EFAULT;
474        goto out;
475    }
476
477    for (i = 0; i < joydev->nabs; i++) {
478        if (abspam[i] > ABS_MAX) {
479            retval = -EINVAL;
480            goto out;
481        }
482    }
483
484    memcpy(joydev->abspam, abspam, len);
485
486    for (i = 0; i < joydev->nabs; i++)
487        joydev->absmap[joydev->abspam[i]] = i;
488
489 out:
490    kfree(abspam);
491    return retval;
492}
493
494static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
495                      void __user *argp, size_t len)
496{
497    __u16 *keypam;
498    int i;
499    int retval = 0;
500
501    len = min(len, sizeof(joydev->keypam));
502
503    /* Validate the map. */
504    keypam = kmalloc(len, GFP_KERNEL);
505    if (!keypam)
506        return -ENOMEM;
507
508    if (copy_from_user(keypam, argp, len)) {
509        retval = -EFAULT;
510        goto out;
511    }
512
513    for (i = 0; i < joydev->nkey; i++) {
514        if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
515            retval = -EINVAL;
516            goto out;
517        }
518    }
519
520    memcpy(joydev->keypam, keypam, len);
521
522    for (i = 0; i < joydev->nkey; i++)
523        joydev->keymap[keypam[i] - BTN_MISC] = i;
524
525 out:
526    kfree(keypam);
527    return retval;
528}
529
530
531static int joydev_ioctl_common(struct joydev *joydev,
532                unsigned int cmd, void __user *argp)
533{
534    struct input_dev *dev = joydev->handle.dev;
535    size_t len;
536    int i;
537    const char *name;
538
539    /* Process fixed-sized commands. */
540    switch (cmd) {
541
542    case JS_SET_CAL:
543        return copy_from_user(&joydev->glue.JS_CORR, argp,
544                sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
545
546    case JS_GET_CAL:
547        return copy_to_user(argp, &joydev->glue.JS_CORR,
548                sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
549
550    case JS_SET_TIMEOUT:
551        return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
552
553    case JS_GET_TIMEOUT:
554        return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
555
556    case JSIOCGVERSION:
557        return put_user(JS_VERSION, (__u32 __user *) argp);
558
559    case JSIOCGAXES:
560        return put_user(joydev->nabs, (__u8 __user *) argp);
561
562    case JSIOCGBUTTONS:
563        return put_user(joydev->nkey, (__u8 __user *) argp);
564
565    case JSIOCSCORR:
566        if (copy_from_user(joydev->corr, argp,
567                  sizeof(joydev->corr[0]) * joydev->nabs))
568            return -EFAULT;
569
570        for (i = 0; i < joydev->nabs; i++) {
571            int val = input_abs_get_val(dev, joydev->abspam[i]);
572            joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
573        }
574        return 0;
575
576    case JSIOCGCORR:
577        return copy_to_user(argp, joydev->corr,
578            sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
579
580    }
581
582    /*
583     * Process variable-sized commands (the axis and button map commands
584     * are considered variable-sized to decouple them from the values of
585     * ABS_MAX and KEY_MAX).
586     */
587    switch (cmd & ~IOCSIZE_MASK) {
588
589    case (JSIOCSAXMAP & ~IOCSIZE_MASK):
590        return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
591
592    case (JSIOCGAXMAP & ~IOCSIZE_MASK):
593        len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
594        return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
595
596    case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
597        return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
598
599    case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
600        len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
601        return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
602
603    case JSIOCGNAME(0):
604        name = dev->name;
605        if (!name)
606            return 0;
607
608        len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
609        return copy_to_user(argp, name, len) ? -EFAULT : len;
610    }
611
612    return -EINVAL;
613}
614
615#ifdef CONFIG_COMPAT
616static long joydev_compat_ioctl(struct file *file,
617                unsigned int cmd, unsigned long arg)
618{
619    struct joydev_client *client = file->private_data;
620    struct joydev *joydev = client->joydev;
621    void __user *argp = (void __user *)arg;
622    s32 tmp32;
623    struct JS_DATA_SAVE_TYPE_32 ds32;
624    int retval;
625
626    retval = mutex_lock_interruptible(&joydev->mutex);
627    if (retval)
628        return retval;
629
630    if (!joydev->exist) {
631        retval = -ENODEV;
632        goto out;
633    }
634
635    switch (cmd) {
636
637    case JS_SET_TIMELIMIT:
638        retval = get_user(tmp32, (s32 __user *) arg);
639        if (retval == 0)
640            joydev->glue.JS_TIMELIMIT = tmp32;
641        break;
642
643    case JS_GET_TIMELIMIT:
644        tmp32 = joydev->glue.JS_TIMELIMIT;
645        retval = put_user(tmp32, (s32 __user *) arg);
646        break;
647
648    case JS_SET_ALL:
649        retval = copy_from_user(&ds32, argp,
650                    sizeof(ds32)) ? -EFAULT : 0;
651        if (retval == 0) {
652            joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
653            joydev->glue.BUSY = ds32.BUSY;
654            joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
655            joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
656            joydev->glue.JS_SAVE = ds32.JS_SAVE;
657            joydev->glue.JS_CORR = ds32.JS_CORR;
658        }
659        break;
660
661    case JS_GET_ALL:
662        ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
663        ds32.BUSY = joydev->glue.BUSY;
664        ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
665        ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
666        ds32.JS_SAVE = joydev->glue.JS_SAVE;
667        ds32.JS_CORR = joydev->glue.JS_CORR;
668
669        retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
670        break;
671
672    default:
673        retval = joydev_ioctl_common(joydev, cmd, argp);
674        break;
675    }
676
677 out:
678    mutex_unlock(&joydev->mutex);
679    return retval;
680}
681#endif /* CONFIG_COMPAT */
682
683static long joydev_ioctl(struct file *file,
684             unsigned int cmd, unsigned long arg)
685{
686    struct joydev_client *client = file->private_data;
687    struct joydev *joydev = client->joydev;
688    void __user *argp = (void __user *)arg;
689    int retval;
690
691    retval = mutex_lock_interruptible(&joydev->mutex);
692    if (retval)
693        return retval;
694
695    if (!joydev->exist) {
696        retval = -ENODEV;
697        goto out;
698    }
699
700    switch (cmd) {
701
702    case JS_SET_TIMELIMIT:
703        retval = get_user(joydev->glue.JS_TIMELIMIT,
704                  (long __user *) arg);
705        break;
706
707    case JS_GET_TIMELIMIT:
708        retval = put_user(joydev->glue.JS_TIMELIMIT,
709                  (long __user *) arg);
710        break;
711
712    case JS_SET_ALL:
713        retval = copy_from_user(&joydev->glue, argp,
714                    sizeof(joydev->glue)) ? -EFAULT: 0;
715        break;
716
717    case JS_GET_ALL:
718        retval = copy_to_user(argp, &joydev->glue,
719                      sizeof(joydev->glue)) ? -EFAULT : 0;
720        break;
721
722    default:
723        retval = joydev_ioctl_common(joydev, cmd, argp);
724        break;
725    }
726 out:
727    mutex_unlock(&joydev->mutex);
728    return retval;
729}
730
731static const struct file_operations joydev_fops = {
732    .owner = THIS_MODULE,
733    .read = joydev_read,
734    .poll = joydev_poll,
735    .open = joydev_open,
736    .release = joydev_release,
737    .unlocked_ioctl = joydev_ioctl,
738#ifdef CONFIG_COMPAT
739    .compat_ioctl = joydev_compat_ioctl,
740#endif
741    .fasync = joydev_fasync,
742    .llseek = no_llseek,
743};
744
745static int joydev_install_chrdev(struct joydev *joydev)
746{
747    joydev_table[joydev->minor] = joydev;
748    return 0;
749}
750
751static void joydev_remove_chrdev(struct joydev *joydev)
752{
753    mutex_lock(&joydev_table_mutex);
754    joydev_table[joydev->minor] = NULL;
755    mutex_unlock(&joydev_table_mutex);
756}
757
758/*
759 * Mark device non-existent. This disables writes, ioctls and
760 * prevents new users from opening the device. Already posted
761 * blocking reads will stay, however new ones will fail.
762 */
763static void joydev_mark_dead(struct joydev *joydev)
764{
765    mutex_lock(&joydev->mutex);
766    joydev->exist = false;
767    mutex_unlock(&joydev->mutex);
768}
769
770static void joydev_cleanup(struct joydev *joydev)
771{
772    struct input_handle *handle = &joydev->handle;
773
774    joydev_mark_dead(joydev);
775    joydev_hangup(joydev);
776    joydev_remove_chrdev(joydev);
777
778    /* joydev is marked dead so no one else accesses joydev->open */
779    if (joydev->open)
780        input_close_device(handle);
781}
782
783
784static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
785{
786    /* Avoid touchpads and touchscreens */
787    if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
788        return false;
789
790    /* Avoid tablets, digitisers and similar devices */
791    if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
792        return false;
793
794    return true;
795}
796
797static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
798              const struct input_device_id *id)
799{
800    struct joydev *joydev;
801    int i, j, t, minor;
802    int error;
803
804    for (minor = 0; minor < JOYDEV_MINORS; minor++)
805        if (!joydev_table[minor])
806            break;
807
808    if (minor == JOYDEV_MINORS) {
809        pr_err("no more free joydev devices\n");
810        return -ENFILE;
811    }
812
813    joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
814    if (!joydev)
815        return -ENOMEM;
816
817    INIT_LIST_HEAD(&joydev->client_list);
818    spin_lock_init(&joydev->client_lock);
819    mutex_init(&joydev->mutex);
820    init_waitqueue_head(&joydev->wait);
821
822    dev_set_name(&joydev->dev, "js%d", minor);
823    joydev->exist = true;
824    joydev->minor = minor;
825
826    joydev->handle.dev = input_get_device(dev);
827    joydev->handle.name = dev_name(&joydev->dev);
828    joydev->handle.handler = handler;
829    joydev->handle.private = joydev;
830
831    for (i = 0; i < ABS_CNT; i++)
832        if (test_bit(i, dev->absbit)) {
833            joydev->absmap[i] = joydev->nabs;
834            joydev->abspam[joydev->nabs] = i;
835            joydev->nabs++;
836        }
837
838    for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
839        if (test_bit(i + BTN_MISC, dev->keybit)) {
840            joydev->keymap[i] = joydev->nkey;
841            joydev->keypam[joydev->nkey] = i + BTN_MISC;
842            joydev->nkey++;
843        }
844
845    for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
846        if (test_bit(i + BTN_MISC, dev->keybit)) {
847            joydev->keymap[i] = joydev->nkey;
848            joydev->keypam[joydev->nkey] = i + BTN_MISC;
849            joydev->nkey++;
850        }
851
852    for (i = 0; i < joydev->nabs; i++) {
853        j = joydev->abspam[i];
854        if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
855            joydev->corr[i].type = JS_CORR_NONE;
856            joydev->abs[i] = input_abs_get_val(dev, j);
857            continue;
858        }
859        joydev->corr[i].type = JS_CORR_BROKEN;
860        joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
861
862        t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
863        joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
864        joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
865
866        t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
867            - 2 * input_abs_get_flat(dev, j);
868        if (t) {
869            joydev->corr[i].coef[2] = (1 << 29) / t;
870            joydev->corr[i].coef[3] = (1 << 29) / t;
871
872            joydev->abs[i] =
873                joydev_correct(input_abs_get_val(dev, j),
874                           joydev->corr + i);
875        }
876    }
877
878    joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
879    joydev->dev.class = &input_class;
880    joydev->dev.parent = &dev->dev;
881    joydev->dev.release = joydev_free;
882    device_initialize(&joydev->dev);
883
884    error = input_register_handle(&joydev->handle);
885    if (error)
886        goto err_free_joydev;
887
888    error = joydev_install_chrdev(joydev);
889    if (error)
890        goto err_unregister_handle;
891
892    error = device_add(&joydev->dev);
893    if (error)
894        goto err_cleanup_joydev;
895
896    return 0;
897
898 err_cleanup_joydev:
899    joydev_cleanup(joydev);
900 err_unregister_handle:
901    input_unregister_handle(&joydev->handle);
902 err_free_joydev:
903    put_device(&joydev->dev);
904    return error;
905}
906
907static void joydev_disconnect(struct input_handle *handle)
908{
909    struct joydev *joydev = handle->private;
910
911    device_del(&joydev->dev);
912    joydev_cleanup(joydev);
913    input_unregister_handle(handle);
914    put_device(&joydev->dev);
915}
916
917static const struct input_device_id joydev_ids[] = {
918    {
919        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
920                INPUT_DEVICE_ID_MATCH_ABSBIT,
921        .evbit = { BIT_MASK(EV_ABS) },
922        .absbit = { BIT_MASK(ABS_X) },
923    },
924    {
925        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
926                INPUT_DEVICE_ID_MATCH_ABSBIT,
927        .evbit = { BIT_MASK(EV_ABS) },
928        .absbit = { BIT_MASK(ABS_WHEEL) },
929    },
930    {
931        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
932                INPUT_DEVICE_ID_MATCH_ABSBIT,
933        .evbit = { BIT_MASK(EV_ABS) },
934        .absbit = { BIT_MASK(ABS_THROTTLE) },
935    },
936    {
937        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
938                INPUT_DEVICE_ID_MATCH_KEYBIT,
939        .evbit = { BIT_MASK(EV_KEY) },
940        .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
941    },
942    {
943        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
944                INPUT_DEVICE_ID_MATCH_KEYBIT,
945        .evbit = { BIT_MASK(EV_KEY) },
946        .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
947    },
948    {
949        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
950                INPUT_DEVICE_ID_MATCH_KEYBIT,
951        .evbit = { BIT_MASK(EV_KEY) },
952        .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
953    },
954    { } /* Terminating entry */
955};
956
957MODULE_DEVICE_TABLE(input, joydev_ids);
958
959static struct input_handler joydev_handler = {
960    .event = joydev_event,
961    .match = joydev_match,
962    .connect = joydev_connect,
963    .disconnect = joydev_disconnect,
964    .fops = &joydev_fops,
965    .minor = JOYDEV_MINOR_BASE,
966    .name = "joydev",
967    .id_table = joydev_ids,
968};
969
970static int __init joydev_init(void)
971{
972    return input_register_handler(&joydev_handler);
973}
974
975static void __exit joydev_exit(void)
976{
977    input_unregister_handler(&joydev_handler);
978}
979
980module_init(joydev_init);
981module_exit(joydev_exit);
982

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