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Commit | Line | Data |
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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/module.h> | |
26 | #include <linux/poll.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/cdev.h> | |
30 | ||
31 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
32 | MODULE_DESCRIPTION("Joystick device interfaces"); | |
33 | MODULE_SUPPORTED_DEVICE("input/js"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
36 | #define JOYDEV_MINOR_BASE 0 | |
37 | #define JOYDEV_MINORS 16 | |
38 | #define JOYDEV_BUFFER_SIZE 64 | |
39 | ||
40 | struct joydev { | |
41 | int open; | |
42 | struct input_handle handle; | |
43 | wait_queue_head_t wait; | |
44 | struct list_head client_list; | |
45 | spinlock_t client_lock; /* protects client_list */ | |
46 | struct mutex mutex; | |
47 | struct device dev; | |
48 | struct cdev cdev; | |
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 | ||
62 | struct 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 | ||
73 | static int joydev_correct(int value, struct js_corr *corr) | |
74 | { | |
75 | switch (corr->type) { | |
76 | ||
77 | case JS_CORR_NONE: | |
78 | break; | |
79 | ||
80 | case JS_CORR_BROKEN: | |
81 | value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : | |
82 | ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : | |
83 | ((corr->coef[2] * (value - corr->coef[0])) >> 14); | |
84 | break; | |
85 | ||
86 | default: | |
87 | return 0; | |
88 | } | |
89 | ||
90 | return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); | |
91 | } | |
92 | ||
93 | static void joydev_pass_event(struct joydev_client *client, | |
94 | struct js_event *event) | |
95 | { | |
96 | struct joydev *joydev = client->joydev; | |
97 | ||
98 | /* | |
99 | * IRQs already disabled, just acquire the lock | |
100 | */ | |
101 | spin_lock(&client->buffer_lock); | |
102 | ||
103 | client->buffer[client->head] = *event; | |
104 | ||
105 | if (client->startup == joydev->nabs + joydev->nkey) { | |
106 | client->head++; | |
107 | client->head &= JOYDEV_BUFFER_SIZE - 1; | |
108 | if (client->tail == client->head) | |
109 | client->startup = 0; | |
110 | } | |
111 | ||
112 | spin_unlock(&client->buffer_lock); | |
113 | ||
114 | kill_fasync(&client->fasync, SIGIO, POLL_IN); | |
115 | } | |
116 | ||
117 | static void joydev_event(struct input_handle *handle, | |
118 | unsigned int type, unsigned int code, int value) | |
119 | { | |
120 | struct joydev *joydev = handle->private; | |
121 | struct joydev_client *client; | |
122 | struct js_event event; | |
123 | ||
124 | switch (type) { | |
125 | ||
126 | case EV_KEY: | |
127 | if (code < BTN_MISC || value == 2) | |
128 | return; | |
129 | event.type = JS_EVENT_BUTTON; | |
130 | event.number = joydev->keymap[code - BTN_MISC]; | |
131 | event.value = value; | |
132 | break; | |
133 | ||
134 | case EV_ABS: | |
135 | event.type = JS_EVENT_AXIS; | |
136 | event.number = joydev->absmap[code]; | |
137 | event.value = joydev_correct(value, | |
138 | &joydev->corr[event.number]); | |
139 | if (event.value == joydev->abs[event.number]) | |
140 | return; | |
141 | joydev->abs[event.number] = event.value; | |
142 | break; | |
143 | ||
144 | default: | |
145 | return; | |
146 | } | |
147 | ||
148 | event.time = jiffies_to_msecs(jiffies); | |
149 | ||
150 | rcu_read_lock(); | |
151 | list_for_each_entry_rcu(client, &joydev->client_list, node) | |
152 | joydev_pass_event(client, &event); | |
153 | rcu_read_unlock(); | |
154 | ||
155 | wake_up_interruptible(&joydev->wait); | |
156 | } | |
157 | ||
158 | static int joydev_fasync(int fd, struct file *file, int on) | |
159 | { | |
160 | struct joydev_client *client = file->private_data; | |
161 | ||
162 | return fasync_helper(fd, file, on, &client->fasync); | |
163 | } | |
164 | ||
165 | static void joydev_free(struct device *dev) | |
166 | { | |
167 | struct joydev *joydev = container_of(dev, struct joydev, dev); | |
168 | ||
169 | input_put_device(joydev->handle.dev); | |
170 | kfree(joydev); | |
171 | } | |
172 | ||
173 | static void joydev_attach_client(struct joydev *joydev, | |
174 | struct joydev_client *client) | |
175 | { | |
176 | spin_lock(&joydev->client_lock); | |
177 | list_add_tail_rcu(&client->node, &joydev->client_list); | |
178 | spin_unlock(&joydev->client_lock); | |
179 | } | |
180 | ||
181 | static void joydev_detach_client(struct joydev *joydev, | |
182 | struct joydev_client *client) | |
183 | { | |
184 | spin_lock(&joydev->client_lock); | |
185 | list_del_rcu(&client->node); | |
186 | spin_unlock(&joydev->client_lock); | |
187 | synchronize_rcu(); | |
188 | } | |
189 | ||
190 | static int joydev_open_device(struct joydev *joydev) | |
191 | { | |
192 | int retval; | |
193 | ||
194 | retval = mutex_lock_interruptible(&joydev->mutex); | |
195 | if (retval) | |
196 | return retval; | |
197 | ||
198 | if (!joydev->exist) | |
199 | retval = -ENODEV; | |
200 | else if (!joydev->open++) { | |
201 | retval = input_open_device(&joydev->handle); | |
202 | if (retval) | |
203 | joydev->open--; | |
204 | } | |
205 | ||
206 | mutex_unlock(&joydev->mutex); | |
207 | return retval; | |
208 | } | |
209 | ||
210 | static void joydev_close_device(struct joydev *joydev) | |
211 | { | |
212 | mutex_lock(&joydev->mutex); | |
213 | ||
214 | if (joydev->exist && !--joydev->open) | |
215 | input_close_device(&joydev->handle); | |
216 | ||
217 | mutex_unlock(&joydev->mutex); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Wake up users waiting for IO so they can disconnect from | |
222 | * dead device. | |
223 | */ | |
224 | static void joydev_hangup(struct joydev *joydev) | |
225 | { | |
226 | struct joydev_client *client; | |
227 | ||
228 | spin_lock(&joydev->client_lock); | |
229 | list_for_each_entry(client, &joydev->client_list, node) | |
230 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); | |
231 | spin_unlock(&joydev->client_lock); | |
232 | ||
233 | wake_up_interruptible(&joydev->wait); | |
234 | } | |
235 | ||
236 | static int joydev_release(struct inode *inode, struct file *file) | |
237 | { | |
238 | struct joydev_client *client = file->private_data; | |
239 | struct joydev *joydev = client->joydev; | |
240 | ||
241 | joydev_detach_client(joydev, client); | |
242 | kfree(client); | |
243 | ||
244 | joydev_close_device(joydev); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static int joydev_open(struct inode *inode, struct file *file) | |
250 | { | |
251 | struct joydev *joydev = | |
252 | container_of(inode->i_cdev, struct joydev, cdev); | |
253 | struct joydev_client *client; | |
254 | int error; | |
255 | ||
256 | client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); | |
257 | if (!client) | |
258 | return -ENOMEM; | |
259 | ||
260 | spin_lock_init(&client->buffer_lock); | |
261 | client->joydev = joydev; | |
262 | joydev_attach_client(joydev, client); | |
263 | ||
264 | error = joydev_open_device(joydev); | |
265 | if (error) | |
266 | goto err_free_client; | |
267 | ||
268 | file->private_data = client; | |
269 | nonseekable_open(inode, file); | |
270 | ||
271 | return 0; | |
272 | ||
273 | err_free_client: | |
274 | joydev_detach_client(joydev, client); | |
275 | kfree(client); | |
276 | return error; | |
277 | } | |
278 | ||
279 | static int joydev_generate_startup_event(struct joydev_client *client, | |
280 | struct input_dev *input, | |
281 | struct js_event *event) | |
282 | { | |
283 | struct joydev *joydev = client->joydev; | |
284 | int have_event; | |
285 | ||
286 | spin_lock_irq(&client->buffer_lock); | |
287 | ||
288 | have_event = client->startup < joydev->nabs + joydev->nkey; | |
289 | ||
290 | if (have_event) { | |
291 | ||
292 | event->time = jiffies_to_msecs(jiffies); | |
293 | if (client->startup < joydev->nkey) { | |
294 | event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; | |
295 | event->number = client->startup; | |
296 | event->value = !!test_bit(joydev->keypam[event->number], | |
297 | input->key); | |
298 | } else { | |
299 | event->type = JS_EVENT_AXIS | JS_EVENT_INIT; | |
300 | event->number = client->startup - joydev->nkey; | |
301 | event->value = joydev->abs[event->number]; | |
302 | } | |
303 | client->startup++; | |
304 | } | |
305 | ||
306 | spin_unlock_irq(&client->buffer_lock); | |
307 | ||
308 | return have_event; | |
309 | } | |
310 | ||
311 | static int joydev_fetch_next_event(struct joydev_client *client, | |
312 | struct js_event *event) | |
313 | { | |
314 | int have_event; | |
315 | ||
316 | spin_lock_irq(&client->buffer_lock); | |
317 | ||
318 | have_event = client->head != client->tail; | |
319 | if (have_event) { | |
320 | *event = client->buffer[client->tail++]; | |
321 | client->tail &= JOYDEV_BUFFER_SIZE - 1; | |
322 | } | |
323 | ||
324 | spin_unlock_irq(&client->buffer_lock); | |
325 | ||
326 | return have_event; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Old joystick interface | |
331 | */ | |
332 | static ssize_t joydev_0x_read(struct joydev_client *client, | |
333 | struct input_dev *input, | |
334 | char __user *buf) | |
335 | { | |
336 | struct joydev *joydev = client->joydev; | |
337 | struct JS_DATA_TYPE data; | |
338 | int i; | |
339 | ||
340 | spin_lock_irq(&input->event_lock); | |
341 | ||
342 | /* | |
343 | * Get device state | |
344 | */ | |
345 | for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) | |
346 | data.buttons |= | |
347 | test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; | |
348 | data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; | |
349 | data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; | |
350 | ||
351 | /* | |
352 | * Reset reader's event queue | |
353 | */ | |
354 | spin_lock(&client->buffer_lock); | |
355 | client->startup = 0; | |
356 | client->tail = client->head; | |
357 | spin_unlock(&client->buffer_lock); | |
358 | ||
359 | spin_unlock_irq(&input->event_lock); | |
360 | ||
361 | if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) | |
362 | return -EFAULT; | |
363 | ||
364 | return sizeof(struct JS_DATA_TYPE); | |
365 | } | |
366 | ||
367 | static inline int joydev_data_pending(struct joydev_client *client) | |
368 | { | |
369 | struct joydev *joydev = client->joydev; | |
370 | ||
371 | return client->startup < joydev->nabs + joydev->nkey || | |
372 | client->head != client->tail; | |
373 | } | |
374 | ||
375 | static ssize_t joydev_read(struct file *file, char __user *buf, | |
376 | size_t count, loff_t *ppos) | |
377 | { | |
378 | struct joydev_client *client = file->private_data; | |
379 | struct joydev *joydev = client->joydev; | |
380 | struct input_dev *input = joydev->handle.dev; | |
381 | struct js_event event; | |
382 | int retval; | |
383 | ||
384 | if (!joydev->exist) | |
385 | return -ENODEV; | |
386 | ||
387 | if (count < sizeof(struct js_event)) | |
388 | return -EINVAL; | |
389 | ||
390 | if (count == sizeof(struct JS_DATA_TYPE)) | |
391 | return joydev_0x_read(client, input, buf); | |
392 | ||
393 | if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) | |
394 | return -EAGAIN; | |
395 | ||
396 | retval = wait_event_interruptible(joydev->wait, | |
397 | !joydev->exist || joydev_data_pending(client)); | |
398 | if (retval) | |
399 | return retval; | |
400 | ||
401 | if (!joydev->exist) | |
402 | return -ENODEV; | |
403 | ||
404 | while (retval + sizeof(struct js_event) <= count && | |
405 | joydev_generate_startup_event(client, input, &event)) { | |
406 | ||
407 | if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) | |
408 | return -EFAULT; | |
409 | ||
410 | retval += sizeof(struct js_event); | |
411 | } | |
412 | ||
413 | while (retval + sizeof(struct js_event) <= count && | |
414 | joydev_fetch_next_event(client, &event)) { | |
415 | ||
416 | if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) | |
417 | return -EFAULT; | |
418 | ||
419 | retval += sizeof(struct js_event); | |
420 | } | |
421 | ||
422 | return retval; | |
423 | } | |
424 | ||
425 | /* No kernel lock - fine */ | |
426 | static unsigned int joydev_poll(struct file *file, poll_table *wait) | |
427 | { | |
428 | struct joydev_client *client = file->private_data; | |
429 | struct joydev *joydev = client->joydev; | |
430 | ||
431 | poll_wait(file, &joydev->wait, wait); | |
432 | return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | | |
433 | (joydev->exist ? 0 : (POLLHUP | POLLERR)); | |
434 | } | |
435 | ||
436 | static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, | |
437 | void __user *argp, size_t len) | |
438 | { | |
439 | __u8 *abspam; | |
440 | int i; | |
441 | int retval = 0; | |
442 | ||
443 | len = min(len, sizeof(joydev->abspam)); | |
444 | ||
445 | /* Validate the map. */ | |
446 | abspam = memdup_user(argp, len); | |
447 | if (IS_ERR(abspam)) | |
448 | return PTR_ERR(abspam); | |
449 | ||
450 | for (i = 0; i < joydev->nabs; i++) { | |
451 | if (abspam[i] > ABS_MAX) { | |
452 | retval = -EINVAL; | |
453 | goto out; | |
454 | } | |
455 | } | |
456 | ||
457 | memcpy(joydev->abspam, abspam, len); | |
458 | ||
459 | for (i = 0; i < joydev->nabs; i++) | |
460 | joydev->absmap[joydev->abspam[i]] = i; | |
461 | ||
462 | out: | |
463 | kfree(abspam); | |
464 | return retval; | |
465 | } | |
466 | ||
467 | static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, | |
468 | void __user *argp, size_t len) | |
469 | { | |
470 | __u16 *keypam; | |
471 | int i; | |
472 | int retval = 0; | |
473 | ||
474 | len = min(len, sizeof(joydev->keypam)); | |
475 | ||
476 | /* Validate the map. */ | |
477 | keypam = memdup_user(argp, len); | |
478 | if (IS_ERR(keypam)) | |
479 | return PTR_ERR(keypam); | |
480 | ||
481 | for (i = 0; i < joydev->nkey; i++) { | |
482 | if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { | |
483 | retval = -EINVAL; | |
484 | goto out; | |
485 | } | |
486 | } | |
487 | ||
488 | memcpy(joydev->keypam, keypam, len); | |
489 | ||
490 | for (i = 0; i < joydev->nkey; i++) | |
491 | joydev->keymap[keypam[i] - BTN_MISC] = i; | |
492 | ||
493 | out: | |
494 | kfree(keypam); | |
495 | return retval; | |
496 | } | |
497 | ||
498 | ||
499 | static int joydev_ioctl_common(struct joydev *joydev, | |
500 | unsigned int cmd, void __user *argp) | |
501 | { | |
502 | struct input_dev *dev = joydev->handle.dev; | |
503 | size_t len; | |
504 | int i; | |
505 | const char *name; | |
506 | ||
507 | /* Process fixed-sized commands. */ | |
508 | switch (cmd) { | |
509 | ||
510 | case JS_SET_CAL: | |
511 | return copy_from_user(&joydev->glue.JS_CORR, argp, | |
512 | sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; | |
513 | ||
514 | case JS_GET_CAL: | |
515 | return copy_to_user(argp, &joydev->glue.JS_CORR, | |
516 | sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; | |
517 | ||
518 | case JS_SET_TIMEOUT: | |
519 | return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); | |
520 | ||
521 | case JS_GET_TIMEOUT: | |
522 | return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); | |
523 | ||
524 | case JSIOCGVERSION: | |
525 | return put_user(JS_VERSION, (__u32 __user *) argp); | |
526 | ||
527 | case JSIOCGAXES: | |
528 | return put_user(joydev->nabs, (__u8 __user *) argp); | |
529 | ||
530 | case JSIOCGBUTTONS: | |
531 | return put_user(joydev->nkey, (__u8 __user *) argp); | |
532 | ||
533 | case JSIOCSCORR: | |
534 | if (copy_from_user(joydev->corr, argp, | |
535 | sizeof(joydev->corr[0]) * joydev->nabs)) | |
536 | return -EFAULT; | |
537 | ||
538 | for (i = 0; i < joydev->nabs; i++) { | |
539 | int val = input_abs_get_val(dev, joydev->abspam[i]); | |
540 | joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); | |
541 | } | |
542 | return 0; | |
543 | ||
544 | case JSIOCGCORR: | |
545 | return copy_to_user(argp, joydev->corr, | |
546 | sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; | |
547 | ||
548 | } | |
549 | ||
550 | /* | |
551 | * Process variable-sized commands (the axis and button map commands | |
552 | * are considered variable-sized to decouple them from the values of | |
553 | * ABS_MAX and KEY_MAX). | |
554 | */ | |
555 | switch (cmd & ~IOCSIZE_MASK) { | |
556 | ||
557 | case (JSIOCSAXMAP & ~IOCSIZE_MASK): | |
558 | return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); | |
559 | ||
560 | case (JSIOCGAXMAP & ~IOCSIZE_MASK): | |
561 | len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); | |
562 | return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; | |
563 | ||
564 | case (JSIOCSBTNMAP & ~IOCSIZE_MASK): | |
565 | return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); | |
566 | ||
567 | case (JSIOCGBTNMAP & ~IOCSIZE_MASK): | |
568 | len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); | |
569 | return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; | |
570 | ||
571 | case JSIOCGNAME(0): | |
572 | name = dev->name; | |
573 | if (!name) | |
574 | return 0; | |
575 | ||
576 | len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); | |
577 | return copy_to_user(argp, name, len) ? -EFAULT : len; | |
578 | } | |
579 | ||
580 | return -EINVAL; | |
581 | } | |
582 | ||
583 | #ifdef CONFIG_COMPAT | |
584 | static long joydev_compat_ioctl(struct file *file, | |
585 | unsigned int cmd, unsigned long arg) | |
586 | { | |
587 | struct joydev_client *client = file->private_data; | |
588 | struct joydev *joydev = client->joydev; | |
589 | void __user *argp = (void __user *)arg; | |
590 | s32 tmp32; | |
591 | struct JS_DATA_SAVE_TYPE_32 ds32; | |
592 | int retval; | |
593 | ||
594 | retval = mutex_lock_interruptible(&joydev->mutex); | |
595 | if (retval) | |
596 | return retval; | |
597 | ||
598 | if (!joydev->exist) { | |
599 | retval = -ENODEV; | |
600 | goto out; | |
601 | } | |
602 | ||
603 | switch (cmd) { | |
604 | ||
605 | case JS_SET_TIMELIMIT: | |
606 | retval = get_user(tmp32, (s32 __user *) arg); | |
607 | if (retval == 0) | |
608 | joydev->glue.JS_TIMELIMIT = tmp32; | |
609 | break; | |
610 | ||
611 | case JS_GET_TIMELIMIT: | |
612 | tmp32 = joydev->glue.JS_TIMELIMIT; | |
613 | retval = put_user(tmp32, (s32 __user *) arg); | |
614 | break; | |
615 | ||
616 | case JS_SET_ALL: | |
617 | retval = copy_from_user(&ds32, argp, | |
618 | sizeof(ds32)) ? -EFAULT : 0; | |
619 | if (retval == 0) { | |
620 | joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; | |
621 | joydev->glue.BUSY = ds32.BUSY; | |
622 | joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; | |
623 | joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; | |
624 | joydev->glue.JS_SAVE = ds32.JS_SAVE; | |
625 | joydev->glue.JS_CORR = ds32.JS_CORR; | |
626 | } | |
627 | break; | |
628 | ||
629 | case JS_GET_ALL: | |
630 | ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; | |
631 | ds32.BUSY = joydev->glue.BUSY; | |
632 | ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; | |
633 | ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; | |
634 | ds32.JS_SAVE = joydev->glue.JS_SAVE; | |
635 | ds32.JS_CORR = joydev->glue.JS_CORR; | |
636 | ||
637 | retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; | |
638 | break; | |
639 | ||
640 | default: | |
641 | retval = joydev_ioctl_common(joydev, cmd, argp); | |
642 | break; | |
643 | } | |
644 | ||
645 | out: | |
646 | mutex_unlock(&joydev->mutex); | |
647 | return retval; | |
648 | } | |
649 | #endif /* CONFIG_COMPAT */ | |
650 | ||
651 | static long joydev_ioctl(struct file *file, | |
652 | unsigned int cmd, unsigned long arg) | |
653 | { | |
654 | struct joydev_client *client = file->private_data; | |
655 | struct joydev *joydev = client->joydev; | |
656 | void __user *argp = (void __user *)arg; | |
657 | int retval; | |
658 | ||
659 | retval = mutex_lock_interruptible(&joydev->mutex); | |
660 | if (retval) | |
661 | return retval; | |
662 | ||
663 | if (!joydev->exist) { | |
664 | retval = -ENODEV; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | switch (cmd) { | |
669 | ||
670 | case JS_SET_TIMELIMIT: | |
671 | retval = get_user(joydev->glue.JS_TIMELIMIT, | |
672 | (long __user *) arg); | |
673 | break; | |
674 | ||
675 | case JS_GET_TIMELIMIT: | |
676 | retval = put_user(joydev->glue.JS_TIMELIMIT, | |
677 | (long __user *) arg); | |
678 | break; | |
679 | ||
680 | case JS_SET_ALL: | |
681 | retval = copy_from_user(&joydev->glue, argp, | |
682 | sizeof(joydev->glue)) ? -EFAULT : 0; | |
683 | break; | |
684 | ||
685 | case JS_GET_ALL: | |
686 | retval = copy_to_user(argp, &joydev->glue, | |
687 | sizeof(joydev->glue)) ? -EFAULT : 0; | |
688 | break; | |
689 | ||
690 | default: | |
691 | retval = joydev_ioctl_common(joydev, cmd, argp); | |
692 | break; | |
693 | } | |
694 | out: | |
695 | mutex_unlock(&joydev->mutex); | |
696 | return retval; | |
697 | } | |
698 | ||
699 | static const struct file_operations joydev_fops = { | |
700 | .owner = THIS_MODULE, | |
701 | .read = joydev_read, | |
702 | .poll = joydev_poll, | |
703 | .open = joydev_open, | |
704 | .release = joydev_release, | |
705 | .unlocked_ioctl = joydev_ioctl, | |
706 | #ifdef CONFIG_COMPAT | |
707 | .compat_ioctl = joydev_compat_ioctl, | |
708 | #endif | |
709 | .fasync = joydev_fasync, | |
710 | .llseek = no_llseek, | |
711 | }; | |
712 | ||
713 | /* | |
714 | * Mark device non-existent. This disables writes, ioctls and | |
715 | * prevents new users from opening the device. Already posted | |
716 | * blocking reads will stay, however new ones will fail. | |
717 | */ | |
718 | static void joydev_mark_dead(struct joydev *joydev) | |
719 | { | |
720 | mutex_lock(&joydev->mutex); | |
721 | joydev->exist = false; | |
722 | mutex_unlock(&joydev->mutex); | |
723 | } | |
724 | ||
725 | static void joydev_cleanup(struct joydev *joydev) | |
726 | { | |
727 | struct input_handle *handle = &joydev->handle; | |
728 | ||
729 | joydev_mark_dead(joydev); | |
730 | joydev_hangup(joydev); | |
731 | ||
732 | cdev_del(&joydev->cdev); | |
733 | ||
734 | /* joydev is marked dead so no one else accesses joydev->open */ | |
735 | if (joydev->open) | |
736 | input_close_device(handle); | |
737 | } | |
738 | ||
739 | static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) | |
740 | { | |
741 | DECLARE_BITMAP(jd_scratch, KEY_CNT); | |
742 | ||
743 | BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); | |
744 | ||
745 | /* | |
746 | * Virtualization (VMware, etc) and remote management (HP | |
747 | * ILO2) solutions use absolute coordinates for their virtual | |
748 | * pointing devices so that there is one-to-one relationship | |
749 | * between pointer position on the host screen and virtual | |
750 | * guest screen, and so their mice use ABS_X, ABS_Y and 3 | |
751 | * primary button events. This clashes with what joydev | |
752 | * considers to be joysticks (a device with at minimum ABS_X | |
753 | * axis). | |
754 | * | |
755 | * Here we are trying to separate absolute mice from | |
756 | * joysticks. A device is, for joystick detection purposes, | |
757 | * considered to be an absolute mouse if the following is | |
758 | * true: | |
759 | * | |
760 | * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN. | |
761 | * 2) Absolute events are exactly ABS_X and ABS_Y. | |
762 | * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE. | |
763 | * 4) Device is not on "Amiga" bus. | |
764 | */ | |
765 | ||
766 | bitmap_zero(jd_scratch, EV_CNT); | |
767 | __set_bit(EV_ABS, jd_scratch); | |
768 | __set_bit(EV_KEY, jd_scratch); | |
769 | __set_bit(EV_SYN, jd_scratch); | |
770 | if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) | |
771 | return false; | |
772 | ||
773 | bitmap_zero(jd_scratch, ABS_CNT); | |
774 | __set_bit(ABS_X, jd_scratch); | |
775 | __set_bit(ABS_Y, jd_scratch); | |
776 | if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) | |
777 | return false; | |
778 | ||
779 | bitmap_zero(jd_scratch, KEY_CNT); | |
780 | __set_bit(BTN_LEFT, jd_scratch); | |
781 | __set_bit(BTN_RIGHT, jd_scratch); | |
782 | __set_bit(BTN_MIDDLE, jd_scratch); | |
783 | ||
784 | if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) | |
785 | return false; | |
786 | ||
787 | /* | |
788 | * Amiga joystick (amijoy) historically uses left/middle/right | |
789 | * button events. | |
790 | */ | |
791 | if (dev->id.bustype == BUS_AMIGA) | |
792 | return false; | |
793 | ||
794 | return true; | |
795 | } | |
796 | ||
797 | static bool joydev_match(struct input_handler *handler, struct input_dev *dev) | |
798 | { | |
799 | /* Avoid touchpads and touchscreens */ | |
800 | if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit)) | |
801 | return false; | |
802 | ||
803 | /* Avoid tablets, digitisers and similar devices */ | |
804 | if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit)) | |
805 | return false; | |
806 | ||
807 | /* Avoid absolute mice */ | |
808 | if (joydev_dev_is_absolute_mouse(dev)) | |
809 | return false; | |
810 | ||
811 | return true; | |
812 | } | |
813 | ||
814 | static int joydev_connect(struct input_handler *handler, struct input_dev *dev, | |
815 | const struct input_device_id *id) | |
816 | { | |
817 | struct joydev *joydev; | |
818 | int i, j, t, minor, dev_no; | |
819 | int error; | |
820 | ||
821 | minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); | |
822 | if (minor < 0) { | |
823 | error = minor; | |
824 | pr_err("failed to reserve new minor: %d\n", error); | |
825 | return error; | |
826 | } | |
827 | ||
828 | joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); | |
829 | if (!joydev) { | |
830 | error = -ENOMEM; | |
831 | goto err_free_minor; | |
832 | } | |
833 | ||
834 | INIT_LIST_HEAD(&joydev->client_list); | |
835 | spin_lock_init(&joydev->client_lock); | |
836 | mutex_init(&joydev->mutex); | |
837 | init_waitqueue_head(&joydev->wait); | |
838 | joydev->exist = true; | |
839 | ||
840 | dev_no = minor; | |
841 | /* Normalize device number if it falls into legacy range */ | |
842 | if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) | |
843 | dev_no -= JOYDEV_MINOR_BASE; | |
844 | dev_set_name(&joydev->dev, "js%d", dev_no); | |
845 | ||
846 | joydev->handle.dev = input_get_device(dev); | |
847 | joydev->handle.name = dev_name(&joydev->dev); | |
848 | joydev->handle.handler = handler; | |
849 | joydev->handle.private = joydev; | |
850 | ||
851 | for_each_set_bit(i, dev->absbit, ABS_CNT) { | |
852 | joydev->absmap[i] = joydev->nabs; | |
853 | joydev->abspam[joydev->nabs] = i; | |
854 | joydev->nabs++; | |
855 | } | |
856 | ||
857 | for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) | |
858 | if (test_bit(i + BTN_MISC, dev->keybit)) { | |
859 | joydev->keymap[i] = joydev->nkey; | |
860 | joydev->keypam[joydev->nkey] = i + BTN_MISC; | |
861 | joydev->nkey++; | |
862 | } | |
863 | ||
864 | for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) | |
865 | if (test_bit(i + BTN_MISC, dev->keybit)) { | |
866 | joydev->keymap[i] = joydev->nkey; | |
867 | joydev->keypam[joydev->nkey] = i + BTN_MISC; | |
868 | joydev->nkey++; | |
869 | } | |
870 | ||
871 | for (i = 0; i < joydev->nabs; i++) { | |
872 | j = joydev->abspam[i]; | |
873 | if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { | |
874 | joydev->corr[i].type = JS_CORR_NONE; | |
875 | joydev->abs[i] = input_abs_get_val(dev, j); | |
876 | continue; | |
877 | } | |
878 | joydev->corr[i].type = JS_CORR_BROKEN; | |
879 | joydev->corr[i].prec = input_abs_get_fuzz(dev, j); | |
880 | ||
881 | t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; | |
882 | joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); | |
883 | joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); | |
884 | ||
885 | t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 | |
886 | - 2 * input_abs_get_flat(dev, j); | |
887 | if (t) { | |
888 | joydev->corr[i].coef[2] = (1 << 29) / t; | |
889 | joydev->corr[i].coef[3] = (1 << 29) / t; | |
890 | ||
891 | joydev->abs[i] = | |
892 | joydev_correct(input_abs_get_val(dev, j), | |
893 | joydev->corr + i); | |
894 | } | |
895 | } | |
896 | ||
897 | joydev->dev.devt = MKDEV(INPUT_MAJOR, minor); | |
898 | joydev->dev.class = &input_class; | |
899 | joydev->dev.parent = &dev->dev; | |
900 | joydev->dev.release = joydev_free; | |
901 | device_initialize(&joydev->dev); | |
902 | ||
903 | error = input_register_handle(&joydev->handle); | |
904 | if (error) | |
905 | goto err_free_joydev; | |
906 | ||
907 | cdev_init(&joydev->cdev, &joydev_fops); | |
908 | joydev->cdev.kobj.parent = &joydev->dev.kobj; | |
909 | error = cdev_add(&joydev->cdev, joydev->dev.devt, 1); | |
910 | if (error) | |
911 | goto err_unregister_handle; | |
912 | ||
913 | error = device_add(&joydev->dev); | |
914 | if (error) | |
915 | goto err_cleanup_joydev; | |
916 | ||
917 | return 0; | |
918 | ||
919 | err_cleanup_joydev: | |
920 | joydev_cleanup(joydev); | |
921 | err_unregister_handle: | |
922 | input_unregister_handle(&joydev->handle); | |
923 | err_free_joydev: | |
924 | put_device(&joydev->dev); | |
925 | err_free_minor: | |
926 | input_free_minor(minor); | |
927 | return error; | |
928 | } | |
929 | ||
930 | static void joydev_disconnect(struct input_handle *handle) | |
931 | { | |
932 | struct joydev *joydev = handle->private; | |
933 | ||
934 | device_del(&joydev->dev); | |
935 | joydev_cleanup(joydev); | |
936 | input_free_minor(MINOR(joydev->dev.devt)); | |
937 | input_unregister_handle(handle); | |
938 | put_device(&joydev->dev); | |
939 | } | |
940 | ||
941 | static const struct input_device_id joydev_ids[] = { | |
942 | { | |
943 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
944 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
945 | .evbit = { BIT_MASK(EV_ABS) }, | |
946 | .absbit = { BIT_MASK(ABS_X) }, | |
947 | }, | |
948 | { | |
949 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
950 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
951 | .evbit = { BIT_MASK(EV_ABS) }, | |
952 | .absbit = { BIT_MASK(ABS_Z) }, | |
953 | }, | |
954 | { | |
955 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
956 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
957 | .evbit = { BIT_MASK(EV_ABS) }, | |
958 | .absbit = { BIT_MASK(ABS_WHEEL) }, | |
959 | }, | |
960 | { | |
961 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
962 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
963 | .evbit = { BIT_MASK(EV_ABS) }, | |
964 | .absbit = { BIT_MASK(ABS_THROTTLE) }, | |
965 | }, | |
966 | { | |
967 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
968 | INPUT_DEVICE_ID_MATCH_KEYBIT, | |
969 | .evbit = { BIT_MASK(EV_KEY) }, | |
970 | .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, | |
971 | }, | |
972 | { | |
973 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
974 | INPUT_DEVICE_ID_MATCH_KEYBIT, | |
975 | .evbit = { BIT_MASK(EV_KEY) }, | |
976 | .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, | |
977 | }, | |
978 | { | |
979 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
980 | INPUT_DEVICE_ID_MATCH_KEYBIT, | |
981 | .evbit = { BIT_MASK(EV_KEY) }, | |
982 | .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, | |
983 | }, | |
984 | { } /* Terminating entry */ | |
985 | }; | |
986 | ||
987 | MODULE_DEVICE_TABLE(input, joydev_ids); | |
988 | ||
989 | static struct input_handler joydev_handler = { | |
990 | .event = joydev_event, | |
991 | .match = joydev_match, | |
992 | .connect = joydev_connect, | |
993 | .disconnect = joydev_disconnect, | |
994 | .legacy_minors = true, | |
995 | .minor = JOYDEV_MINOR_BASE, | |
996 | .name = "joydev", | |
997 | .id_table = joydev_ids, | |
998 | }; | |
999 | ||
1000 | static int __init joydev_init(void) | |
1001 | { | |
1002 | return input_register_handler(&joydev_handler); | |
1003 | } | |
1004 | ||
1005 | static void __exit joydev_exit(void) | |
1006 | { | |
1007 | input_unregister_handler(&joydev_handler); | |
1008 | } | |
1009 | ||
1010 | module_init(joydev_init); | |
1011 | module_exit(joydev_exit); |