1 /*
2  * HID driver for Nintendo Wii / Wii U peripherals
3  * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
4  */
5 
6 /*
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  */
12 
13 #include <linux/completion.h>
14 #include <linux/device.h>
15 #include <linux/hid.h>
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/mutex.h>
19 #include <linux/spinlock.h>
20 #include "hid-ids.h"
21 #include "hid-wiimote.h"
22 
23 /* output queue handling */
24 
25 static int wiimote_hid_send(struct hid_device *hdev, __u8 *buffer,
26 			    size_t count)
27 {
28 	__u8 *buf;
29 	int ret;
30 
31 	if (!hdev->ll_driver->output_report)
32 		return -ENODEV;
33 
34 	buf = kmemdup(buffer, count, GFP_KERNEL);
35 	if (!buf)
36 		return -ENOMEM;
37 
38 	ret = hid_hw_output_report(hdev, buf, count);
39 
40 	kfree(buf);
41 	return ret;
42 }
43 
44 static void wiimote_queue_worker(struct work_struct *work)
45 {
46 	struct wiimote_queue *queue = container_of(work, struct wiimote_queue,
47 						   worker);
48 	struct wiimote_data *wdata = container_of(queue, struct wiimote_data,
49 						  queue);
50 	unsigned long flags;
51 	int ret;
52 
53 	spin_lock_irqsave(&wdata->queue.lock, flags);
54 
55 	while (wdata->queue.head != wdata->queue.tail) {
56 		spin_unlock_irqrestore(&wdata->queue.lock, flags);
57 		ret = wiimote_hid_send(wdata->hdev,
58 				 wdata->queue.outq[wdata->queue.tail].data,
59 				 wdata->queue.outq[wdata->queue.tail].size);
60 		if (ret < 0) {
61 			spin_lock_irqsave(&wdata->state.lock, flags);
62 			wiimote_cmd_abort(wdata);
63 			spin_unlock_irqrestore(&wdata->state.lock, flags);
64 		}
65 		spin_lock_irqsave(&wdata->queue.lock, flags);
66 
67 		wdata->queue.tail = (wdata->queue.tail + 1) % WIIMOTE_BUFSIZE;
68 	}
69 
70 	spin_unlock_irqrestore(&wdata->queue.lock, flags);
71 }
72 
73 static void wiimote_queue(struct wiimote_data *wdata, const __u8 *buffer,
74 								size_t count)
75 {
76 	unsigned long flags;
77 	__u8 newhead;
78 
79 	if (count > HID_MAX_BUFFER_SIZE) {
80 		hid_warn(wdata->hdev, "Sending too large output report\n");
81 
82 		spin_lock_irqsave(&wdata->queue.lock, flags);
83 		goto out_error;
84 	}
85 
86 	/*
87 	 * Copy new request into our output queue and check whether the
88 	 * queue is full. If it is full, discard this request.
89 	 * If it is empty we need to start a new worker that will
90 	 * send out the buffer to the hid device.
91 	 * If the queue is not empty, then there must be a worker
92 	 * that is currently sending out our buffer and this worker
93 	 * will reschedule itself until the queue is empty.
94 	 */
95 
96 	spin_lock_irqsave(&wdata->queue.lock, flags);
97 
98 	memcpy(wdata->queue.outq[wdata->queue.head].data, buffer, count);
99 	wdata->queue.outq[wdata->queue.head].size = count;
100 	newhead = (wdata->queue.head + 1) % WIIMOTE_BUFSIZE;
101 
102 	if (wdata->queue.head == wdata->queue.tail) {
103 		wdata->queue.head = newhead;
104 		schedule_work(&wdata->queue.worker);
105 	} else if (newhead != wdata->queue.tail) {
106 		wdata->queue.head = newhead;
107 	} else {
108 		hid_warn(wdata->hdev, "Output queue is full");
109 		goto out_error;
110 	}
111 
112 	goto out_unlock;
113 
114 out_error:
115 	wiimote_cmd_abort(wdata);
116 out_unlock:
117 	spin_unlock_irqrestore(&wdata->queue.lock, flags);
118 }
119 
120 /*
121  * This sets the rumble bit on the given output report if rumble is
122  * currently enabled.
123  * \cmd1 must point to the second byte in the output report => &cmd[1]
124  * This must be called on nearly every output report before passing it
125  * into the output queue!
126  */
127 static inline void wiiproto_keep_rumble(struct wiimote_data *wdata, __u8 *cmd1)
128 {
129 	if (wdata->state.flags & WIIPROTO_FLAG_RUMBLE)
130 		*cmd1 |= 0x01;
131 }
132 
133 void wiiproto_req_rumble(struct wiimote_data *wdata, __u8 rumble)
134 {
135 	__u8 cmd[2];
136 
137 	rumble = !!rumble;
138 	if (rumble == !!(wdata->state.flags & WIIPROTO_FLAG_RUMBLE))
139 		return;
140 
141 	if (rumble)
142 		wdata->state.flags |= WIIPROTO_FLAG_RUMBLE;
143 	else
144 		wdata->state.flags &= ~WIIPROTO_FLAG_RUMBLE;
145 
146 	cmd[0] = WIIPROTO_REQ_RUMBLE;
147 	cmd[1] = 0;
148 
149 	wiiproto_keep_rumble(wdata, &cmd[1]);
150 	wiimote_queue(wdata, cmd, sizeof(cmd));
151 }
152 
153 void wiiproto_req_leds(struct wiimote_data *wdata, int leds)
154 {
155 	__u8 cmd[2];
156 
157 	leds &= WIIPROTO_FLAGS_LEDS;
158 	if ((wdata->state.flags & WIIPROTO_FLAGS_LEDS) == leds)
159 		return;
160 	wdata->state.flags = (wdata->state.flags & ~WIIPROTO_FLAGS_LEDS) | leds;
161 
162 	cmd[0] = WIIPROTO_REQ_LED;
163 	cmd[1] = 0;
164 
165 	if (leds & WIIPROTO_FLAG_LED1)
166 		cmd[1] |= 0x10;
167 	if (leds & WIIPROTO_FLAG_LED2)
168 		cmd[1] |= 0x20;
169 	if (leds & WIIPROTO_FLAG_LED3)
170 		cmd[1] |= 0x40;
171 	if (leds & WIIPROTO_FLAG_LED4)
172 		cmd[1] |= 0x80;
173 
174 	wiiproto_keep_rumble(wdata, &cmd[1]);
175 	wiimote_queue(wdata, cmd, sizeof(cmd));
176 }
177 
178 /*
179  * Check what peripherals of the wiimote are currently
180  * active and select a proper DRM that supports all of
181  * the requested data inputs.
182  *
183  * Not all combinations are actually supported. The following
184  * combinations work only with limitations:
185  *  - IR cam in extended or full mode disables any data transmission
186  *    of extension controllers. There is no DRM mode that supports
187  *    extension bytes plus extended/full IR.
188  *  - IR cam with accelerometer and extension *_EXT8 is not supported.
189  *    However, all extensions that need *_EXT8 are devices that don't
190  *    support IR cameras. Hence, this shouldn't happen under normal
191  *    operation.
192  *  - *_EXT16 is only supported in combination with buttons and
193  *    accelerometer. No IR or similar can be active simultaneously. As
194  *    above, all modules that require it are mutually exclusive with
195  *    IR/etc. so this doesn't matter.
196  */
197 static __u8 select_drm(struct wiimote_data *wdata)
198 {
199 	__u8 ir = wdata->state.flags & WIIPROTO_FLAGS_IR;
200 	bool ext;
201 
202 	ext = (wdata->state.flags & WIIPROTO_FLAG_EXT_USED) ||
203 	      (wdata->state.flags & WIIPROTO_FLAG_MP_USED);
204 
205 	/* some 3rd-party balance-boards are hard-coded to KEE, *sigh* */
206 	if (wdata->state.devtype == WIIMOTE_DEV_BALANCE_BOARD) {
207 		if (ext)
208 			return WIIPROTO_REQ_DRM_KEE;
209 		else
210 			return WIIPROTO_REQ_DRM_K;
211 	}
212 
213 	if (ir == WIIPROTO_FLAG_IR_BASIC) {
214 		if (wdata->state.flags & WIIPROTO_FLAG_ACCEL) {
215 			/* GEN10 and ealier devices bind IR formats to DRMs.
216 			 * Hence, we cannot use DRM_KAI here as it might be
217 			 * bound to IR_EXT. Use DRM_KAIE unconditionally so we
218 			 * work with all devices and our parsers can use the
219 			 * fixed formats, too. */
220 			return WIIPROTO_REQ_DRM_KAIE;
221 		} else {
222 			return WIIPROTO_REQ_DRM_KIE;
223 		}
224 	} else if (ir == WIIPROTO_FLAG_IR_EXT) {
225 		return WIIPROTO_REQ_DRM_KAI;
226 	} else if (ir == WIIPROTO_FLAG_IR_FULL) {
227 		return WIIPROTO_REQ_DRM_SKAI1;
228 	} else {
229 		if (wdata->state.flags & WIIPROTO_FLAG_ACCEL) {
230 			if (ext)
231 				return WIIPROTO_REQ_DRM_KAE;
232 			else
233 				return WIIPROTO_REQ_DRM_KA;
234 		} else {
235 			if (ext)
236 				return WIIPROTO_REQ_DRM_KEE;
237 			else
238 				return WIIPROTO_REQ_DRM_K;
239 		}
240 	}
241 }
242 
243 void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm)
244 {
245 	__u8 cmd[3];
246 
247 	if (wdata->state.flags & WIIPROTO_FLAG_DRM_LOCKED)
248 		drm = wdata->state.drm;
249 	else if (drm == WIIPROTO_REQ_NULL)
250 		drm = select_drm(wdata);
251 
252 	cmd[0] = WIIPROTO_REQ_DRM;
253 	cmd[1] = 0;
254 	cmd[2] = drm;
255 
256 	wdata->state.drm = drm;
257 	wiiproto_keep_rumble(wdata, &cmd[1]);
258 	wiimote_queue(wdata, cmd, sizeof(cmd));
259 }
260 
261 void wiiproto_req_status(struct wiimote_data *wdata)
262 {
263 	__u8 cmd[2];
264 
265 	cmd[0] = WIIPROTO_REQ_SREQ;
266 	cmd[1] = 0;
267 
268 	wiiproto_keep_rumble(wdata, &cmd[1]);
269 	wiimote_queue(wdata, cmd, sizeof(cmd));
270 }
271 
272 void wiiproto_req_accel(struct wiimote_data *wdata, __u8 accel)
273 {
274 	accel = !!accel;
275 	if (accel == !!(wdata->state.flags & WIIPROTO_FLAG_ACCEL))
276 		return;
277 
278 	if (accel)
279 		wdata->state.flags |= WIIPROTO_FLAG_ACCEL;
280 	else
281 		wdata->state.flags &= ~WIIPROTO_FLAG_ACCEL;
282 
283 	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
284 }
285 
286 void wiiproto_req_ir1(struct wiimote_data *wdata, __u8 flags)
287 {
288 	__u8 cmd[2];
289 
290 	cmd[0] = WIIPROTO_REQ_IR1;
291 	cmd[1] = flags;
292 
293 	wiiproto_keep_rumble(wdata, &cmd[1]);
294 	wiimote_queue(wdata, cmd, sizeof(cmd));
295 }
296 
297 void wiiproto_req_ir2(struct wiimote_data *wdata, __u8 flags)
298 {
299 	__u8 cmd[2];
300 
301 	cmd[0] = WIIPROTO_REQ_IR2;
302 	cmd[1] = flags;
303 
304 	wiiproto_keep_rumble(wdata, &cmd[1]);
305 	wiimote_queue(wdata, cmd, sizeof(cmd));
306 }
307 
308 #define wiiproto_req_wreg(wdata, os, buf, sz) \
309 			wiiproto_req_wmem((wdata), false, (os), (buf), (sz))
310 
311 #define wiiproto_req_weeprom(wdata, os, buf, sz) \
312 			wiiproto_req_wmem((wdata), true, (os), (buf), (sz))
313 
314 static void wiiproto_req_wmem(struct wiimote_data *wdata, bool eeprom,
315 				__u32 offset, const __u8 *buf, __u8 size)
316 {
317 	__u8 cmd[22];
318 
319 	if (size > 16 || size == 0) {
320 		hid_warn(wdata->hdev, "Invalid length %d wmem request\n", size);
321 		return;
322 	}
323 
324 	memset(cmd, 0, sizeof(cmd));
325 	cmd[0] = WIIPROTO_REQ_WMEM;
326 	cmd[2] = (offset >> 16) & 0xff;
327 	cmd[3] = (offset >> 8) & 0xff;
328 	cmd[4] = offset & 0xff;
329 	cmd[5] = size;
330 	memcpy(&cmd[6], buf, size);
331 
332 	if (!eeprom)
333 		cmd[1] |= 0x04;
334 
335 	wiiproto_keep_rumble(wdata, &cmd[1]);
336 	wiimote_queue(wdata, cmd, sizeof(cmd));
337 }
338 
339 void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom, __u32 offset,
340 								__u16 size)
341 {
342 	__u8 cmd[7];
343 
344 	if (size == 0) {
345 		hid_warn(wdata->hdev, "Invalid length %d rmem request\n", size);
346 		return;
347 	}
348 
349 	cmd[0] = WIIPROTO_REQ_RMEM;
350 	cmd[1] = 0;
351 	cmd[2] = (offset >> 16) & 0xff;
352 	cmd[3] = (offset >> 8) & 0xff;
353 	cmd[4] = offset & 0xff;
354 	cmd[5] = (size >> 8) & 0xff;
355 	cmd[6] = size & 0xff;
356 
357 	if (!eeprom)
358 		cmd[1] |= 0x04;
359 
360 	wiiproto_keep_rumble(wdata, &cmd[1]);
361 	wiimote_queue(wdata, cmd, sizeof(cmd));
362 }
363 
364 /* requries the cmd-mutex to be held */
365 int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
366 						const __u8 *wmem, __u8 size)
367 {
368 	unsigned long flags;
369 	int ret;
370 
371 	spin_lock_irqsave(&wdata->state.lock, flags);
372 	wiimote_cmd_set(wdata, WIIPROTO_REQ_WMEM, 0);
373 	wiiproto_req_wreg(wdata, offset, wmem, size);
374 	spin_unlock_irqrestore(&wdata->state.lock, flags);
375 
376 	ret = wiimote_cmd_wait(wdata);
377 	if (!ret && wdata->state.cmd_err)
378 		ret = -EIO;
379 
380 	return ret;
381 }
382 
383 /* requries the cmd-mutex to be held */
384 ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset, __u8 *rmem,
385 								__u8 size)
386 {
387 	unsigned long flags;
388 	ssize_t ret;
389 
390 	spin_lock_irqsave(&wdata->state.lock, flags);
391 	wdata->state.cmd_read_size = size;
392 	wdata->state.cmd_read_buf = rmem;
393 	wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, offset & 0xffff);
394 	wiiproto_req_rreg(wdata, offset, size);
395 	spin_unlock_irqrestore(&wdata->state.lock, flags);
396 
397 	ret = wiimote_cmd_wait(wdata);
398 
399 	spin_lock_irqsave(&wdata->state.lock, flags);
400 	wdata->state.cmd_read_buf = NULL;
401 	spin_unlock_irqrestore(&wdata->state.lock, flags);
402 
403 	if (!ret) {
404 		if (wdata->state.cmd_read_size == 0)
405 			ret = -EIO;
406 		else
407 			ret = wdata->state.cmd_read_size;
408 	}
409 
410 	return ret;
411 }
412 
413 /* requires the cmd-mutex to be held */
414 static int wiimote_cmd_init_ext(struct wiimote_data *wdata)
415 {
416 	__u8 wmem;
417 	int ret;
418 
419 	/* initialize extension */
420 	wmem = 0x55;
421 	ret = wiimote_cmd_write(wdata, 0xa400f0, &wmem, sizeof(wmem));
422 	if (ret)
423 		return ret;
424 
425 	/* disable default encryption */
426 	wmem = 0x0;
427 	ret = wiimote_cmd_write(wdata, 0xa400fb, &wmem, sizeof(wmem));
428 	if (ret)
429 		return ret;
430 
431 	return 0;
432 }
433 
434 /* requires the cmd-mutex to be held */
435 static __u8 wiimote_cmd_read_ext(struct wiimote_data *wdata, __u8 *rmem)
436 {
437 	int ret;
438 
439 	/* read extension ID */
440 	ret = wiimote_cmd_read(wdata, 0xa400fa, rmem, 6);
441 	if (ret != 6)
442 		return WIIMOTE_EXT_NONE;
443 
444 	hid_dbg(wdata->hdev, "extension ID: %6phC\n", rmem);
445 
446 	if (rmem[0] == 0xff && rmem[1] == 0xff && rmem[2] == 0xff &&
447 	    rmem[3] == 0xff && rmem[4] == 0xff && rmem[5] == 0xff)
448 		return WIIMOTE_EXT_NONE;
449 
450 	if (rmem[4] == 0x00 && rmem[5] == 0x00)
451 		return WIIMOTE_EXT_NUNCHUK;
452 	if (rmem[4] == 0x01 && rmem[5] == 0x01)
453 		return WIIMOTE_EXT_CLASSIC_CONTROLLER;
454 	if (rmem[4] == 0x04 && rmem[5] == 0x02)
455 		return WIIMOTE_EXT_BALANCE_BOARD;
456 	if (rmem[4] == 0x01 && rmem[5] == 0x20)
457 		return WIIMOTE_EXT_PRO_CONTROLLER;
458 
459 	return WIIMOTE_EXT_UNKNOWN;
460 }
461 
462 /* requires the cmd-mutex to be held */
463 static int wiimote_cmd_init_mp(struct wiimote_data *wdata)
464 {
465 	__u8 wmem;
466 	int ret;
467 
468 	/* initialize MP */
469 	wmem = 0x55;
470 	ret = wiimote_cmd_write(wdata, 0xa600f0, &wmem, sizeof(wmem));
471 	if (ret)
472 		return ret;
473 
474 	/* disable default encryption */
475 	wmem = 0x0;
476 	ret = wiimote_cmd_write(wdata, 0xa600fb, &wmem, sizeof(wmem));
477 	if (ret)
478 		return ret;
479 
480 	return 0;
481 }
482 
483 /* requires the cmd-mutex to be held */
484 static bool wiimote_cmd_map_mp(struct wiimote_data *wdata, __u8 exttype)
485 {
486 	__u8 wmem;
487 
488 	/* map MP with correct pass-through mode */
489 	switch (exttype) {
490 	case WIIMOTE_EXT_CLASSIC_CONTROLLER:
491 		wmem = 0x07;
492 		break;
493 	case WIIMOTE_EXT_NUNCHUK:
494 		wmem = 0x05;
495 		break;
496 	default:
497 		wmem = 0x04;
498 		break;
499 	}
500 
501 	return wiimote_cmd_write(wdata, 0xa600fe, &wmem, sizeof(wmem));
502 }
503 
504 /* requires the cmd-mutex to be held */
505 static bool wiimote_cmd_read_mp(struct wiimote_data *wdata, __u8 *rmem)
506 {
507 	int ret;
508 
509 	/* read motion plus ID */
510 	ret = wiimote_cmd_read(wdata, 0xa600fa, rmem, 6);
511 	if (ret != 6)
512 		return false;
513 
514 	hid_dbg(wdata->hdev, "motion plus ID: %6phC\n", rmem);
515 
516 	if (rmem[5] == 0x05)
517 		return true;
518 
519 	hid_info(wdata->hdev, "unknown motion plus ID: %6phC\n", rmem);
520 
521 	return false;
522 }
523 
524 /* requires the cmd-mutex to be held */
525 static __u8 wiimote_cmd_read_mp_mapped(struct wiimote_data *wdata)
526 {
527 	int ret;
528 	__u8 rmem[6];
529 
530 	/* read motion plus ID */
531 	ret = wiimote_cmd_read(wdata, 0xa400fa, rmem, 6);
532 	if (ret != 6)
533 		return WIIMOTE_MP_NONE;
534 
535 	hid_dbg(wdata->hdev, "mapped motion plus ID: %6phC\n", rmem);
536 
537 	if (rmem[0] == 0xff && rmem[1] == 0xff && rmem[2] == 0xff &&
538 	    rmem[3] == 0xff && rmem[4] == 0xff && rmem[5] == 0xff)
539 		return WIIMOTE_MP_NONE;
540 
541 	if (rmem[4] == 0x04 && rmem[5] == 0x05)
542 		return WIIMOTE_MP_SINGLE;
543 	else if (rmem[4] == 0x05 && rmem[5] == 0x05)
544 		return WIIMOTE_MP_PASSTHROUGH_NUNCHUK;
545 	else if (rmem[4] == 0x07 && rmem[5] == 0x05)
546 		return WIIMOTE_MP_PASSTHROUGH_CLASSIC;
547 
548 	return WIIMOTE_MP_UNKNOWN;
549 }
550 
551 /* device module handling */
552 
553 static const __u8 * const wiimote_devtype_mods[WIIMOTE_DEV_NUM] = {
554 	[WIIMOTE_DEV_PENDING] = (const __u8[]){
555 		WIIMOD_NULL,
556 	},
557 	[WIIMOTE_DEV_UNKNOWN] = (const __u8[]){
558 		WIIMOD_NO_MP,
559 		WIIMOD_NULL,
560 	},
561 	[WIIMOTE_DEV_GENERIC] = (const __u8[]){
562 		WIIMOD_KEYS,
563 		WIIMOD_RUMBLE,
564 		WIIMOD_BATTERY,
565 		WIIMOD_LED1,
566 		WIIMOD_LED2,
567 		WIIMOD_LED3,
568 		WIIMOD_LED4,
569 		WIIMOD_ACCEL,
570 		WIIMOD_IR,
571 		WIIMOD_NULL,
572 	},
573 	[WIIMOTE_DEV_GEN10] = (const __u8[]){
574 		WIIMOD_KEYS,
575 		WIIMOD_RUMBLE,
576 		WIIMOD_BATTERY,
577 		WIIMOD_LED1,
578 		WIIMOD_LED2,
579 		WIIMOD_LED3,
580 		WIIMOD_LED4,
581 		WIIMOD_ACCEL,
582 		WIIMOD_IR,
583 		WIIMOD_NULL,
584 	},
585 	[WIIMOTE_DEV_GEN20] = (const __u8[]){
586 		WIIMOD_KEYS,
587 		WIIMOD_RUMBLE,
588 		WIIMOD_BATTERY,
589 		WIIMOD_LED1,
590 		WIIMOD_LED2,
591 		WIIMOD_LED3,
592 		WIIMOD_LED4,
593 		WIIMOD_ACCEL,
594 		WIIMOD_IR,
595 		WIIMOD_BUILTIN_MP,
596 		WIIMOD_NULL,
597 	},
598 	[WIIMOTE_DEV_BALANCE_BOARD] = (const __u8[]) {
599 		WIIMOD_BATTERY,
600 		WIIMOD_LED1,
601 		WIIMOD_NO_MP,
602 		WIIMOD_NULL,
603 	},
604 	[WIIMOTE_DEV_PRO_CONTROLLER] = (const __u8[]) {
605 		WIIMOD_BATTERY,
606 		WIIMOD_LED1,
607 		WIIMOD_LED2,
608 		WIIMOD_LED3,
609 		WIIMOD_LED4,
610 		WIIMOD_NO_MP,
611 		WIIMOD_NULL,
612 	},
613 };
614 
615 static void wiimote_modules_load(struct wiimote_data *wdata,
616 				 unsigned int devtype)
617 {
618 	bool need_input = false;
619 	const __u8 *mods, *iter;
620 	const struct wiimod_ops *ops;
621 	int ret;
622 
623 	mods = wiimote_devtype_mods[devtype];
624 
625 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
626 		if (wiimod_table[*iter]->flags & WIIMOD_FLAG_INPUT) {
627 			need_input = true;
628 			break;
629 		}
630 	}
631 
632 	if (need_input) {
633 		wdata->input = input_allocate_device();
634 		if (!wdata->input)
635 			return;
636 
637 		input_set_drvdata(wdata->input, wdata);
638 		wdata->input->dev.parent = &wdata->hdev->dev;
639 		wdata->input->id.bustype = wdata->hdev->bus;
640 		wdata->input->id.vendor = wdata->hdev->vendor;
641 		wdata->input->id.product = wdata->hdev->product;
642 		wdata->input->id.version = wdata->hdev->version;
643 		wdata->input->name = WIIMOTE_NAME;
644 	}
645 
646 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
647 		ops = wiimod_table[*iter];
648 		if (!ops->probe)
649 			continue;
650 
651 		ret = ops->probe(ops, wdata);
652 		if (ret)
653 			goto error;
654 	}
655 
656 	if (wdata->input) {
657 		ret = input_register_device(wdata->input);
658 		if (ret)
659 			goto error;
660 	}
661 
662 	spin_lock_irq(&wdata->state.lock);
663 	wdata->state.devtype = devtype;
664 	spin_unlock_irq(&wdata->state.lock);
665 	return;
666 
667 error:
668 	for ( ; iter-- != mods; ) {
669 		ops = wiimod_table[*iter];
670 		if (ops->remove)
671 			ops->remove(ops, wdata);
672 	}
673 
674 	if (wdata->input) {
675 		input_free_device(wdata->input);
676 		wdata->input = NULL;
677 	}
678 }
679 
680 static void wiimote_modules_unload(struct wiimote_data *wdata)
681 {
682 	const __u8 *mods, *iter;
683 	const struct wiimod_ops *ops;
684 	unsigned long flags;
685 
686 	mods = wiimote_devtype_mods[wdata->state.devtype];
687 
688 	spin_lock_irqsave(&wdata->state.lock, flags);
689 	wdata->state.devtype = WIIMOTE_DEV_UNKNOWN;
690 	spin_unlock_irqrestore(&wdata->state.lock, flags);
691 
692 	/* find end of list */
693 	for (iter = mods; *iter != WIIMOD_NULL; ++iter)
694 		/* empty */ ;
695 
696 	if (wdata->input) {
697 		input_get_device(wdata->input);
698 		input_unregister_device(wdata->input);
699 	}
700 
701 	for ( ; iter-- != mods; ) {
702 		ops = wiimod_table[*iter];
703 		if (ops->remove)
704 			ops->remove(ops, wdata);
705 	}
706 
707 	if (wdata->input) {
708 		input_put_device(wdata->input);
709 		wdata->input = NULL;
710 	}
711 }
712 
713 /* device extension handling */
714 
715 static void wiimote_ext_load(struct wiimote_data *wdata, unsigned int ext)
716 {
717 	unsigned long flags;
718 	const struct wiimod_ops *ops;
719 	int ret;
720 
721 	ops = wiimod_ext_table[ext];
722 
723 	if (ops->probe) {
724 		ret = ops->probe(ops, wdata);
725 		if (ret)
726 			ext = WIIMOTE_EXT_UNKNOWN;
727 	}
728 
729 	spin_lock_irqsave(&wdata->state.lock, flags);
730 	wdata->state.exttype = ext;
731 	spin_unlock_irqrestore(&wdata->state.lock, flags);
732 }
733 
734 static void wiimote_ext_unload(struct wiimote_data *wdata)
735 {
736 	unsigned long flags;
737 	const struct wiimod_ops *ops;
738 
739 	ops = wiimod_ext_table[wdata->state.exttype];
740 
741 	spin_lock_irqsave(&wdata->state.lock, flags);
742 	wdata->state.exttype = WIIMOTE_EXT_UNKNOWN;
743 	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
744 	spin_unlock_irqrestore(&wdata->state.lock, flags);
745 
746 	if (ops->remove)
747 		ops->remove(ops, wdata);
748 }
749 
750 static void wiimote_mp_load(struct wiimote_data *wdata)
751 {
752 	unsigned long flags;
753 	const struct wiimod_ops *ops;
754 	int ret;
755 	__u8 mode = 2;
756 
757 	ops = &wiimod_mp;
758 	if (ops->probe) {
759 		ret = ops->probe(ops, wdata);
760 		if (ret)
761 			mode = 1;
762 	}
763 
764 	spin_lock_irqsave(&wdata->state.lock, flags);
765 	wdata->state.mp = mode;
766 	spin_unlock_irqrestore(&wdata->state.lock, flags);
767 }
768 
769 static void wiimote_mp_unload(struct wiimote_data *wdata)
770 {
771 	unsigned long flags;
772 	const struct wiimod_ops *ops;
773 
774 	if (wdata->state.mp < 2)
775 		return;
776 
777 	ops = &wiimod_mp;
778 
779 	spin_lock_irqsave(&wdata->state.lock, flags);
780 	wdata->state.mp = 0;
781 	wdata->state.flags &= ~WIIPROTO_FLAG_MP_USED;
782 	spin_unlock_irqrestore(&wdata->state.lock, flags);
783 
784 	if (ops->remove)
785 		ops->remove(ops, wdata);
786 }
787 
788 /* device (re-)initialization and detection */
789 
790 static const char *wiimote_devtype_names[WIIMOTE_DEV_NUM] = {
791 	[WIIMOTE_DEV_PENDING] = "Pending",
792 	[WIIMOTE_DEV_UNKNOWN] = "Unknown",
793 	[WIIMOTE_DEV_GENERIC] = "Generic",
794 	[WIIMOTE_DEV_GEN10] = "Nintendo Wii Remote (Gen 1)",
795 	[WIIMOTE_DEV_GEN20] = "Nintendo Wii Remote Plus (Gen 2)",
796 	[WIIMOTE_DEV_BALANCE_BOARD] = "Nintendo Wii Balance Board",
797 	[WIIMOTE_DEV_PRO_CONTROLLER] = "Nintendo Wii U Pro Controller",
798 };
799 
800 /* Try to guess the device type based on all collected information. We
801  * first try to detect by static extension types, then VID/PID and the
802  * device name. If we cannot detect the device, we use
803  * WIIMOTE_DEV_GENERIC so all modules will get probed on the device. */
804 static void wiimote_init_set_type(struct wiimote_data *wdata,
805 				  __u8 exttype)
806 {
807 	__u8 devtype = WIIMOTE_DEV_GENERIC;
808 	__u16 vendor, product;
809 	const char *name;
810 
811 	vendor = wdata->hdev->vendor;
812 	product = wdata->hdev->product;
813 	name = wdata->hdev->name;
814 
815 	if (exttype == WIIMOTE_EXT_BALANCE_BOARD) {
816 		devtype = WIIMOTE_DEV_BALANCE_BOARD;
817 		goto done;
818 	} else if (exttype == WIIMOTE_EXT_PRO_CONTROLLER) {
819 		devtype = WIIMOTE_DEV_PRO_CONTROLLER;
820 		goto done;
821 	}
822 
823 	if (!strcmp(name, "Nintendo RVL-CNT-01")) {
824 		devtype = WIIMOTE_DEV_GEN10;
825 		goto done;
826 	} else if (!strcmp(name, "Nintendo RVL-CNT-01-TR")) {
827 		devtype = WIIMOTE_DEV_GEN20;
828 		goto done;
829 	} else if (!strcmp(name, "Nintendo RVL-WBC-01")) {
830 		devtype = WIIMOTE_DEV_BALANCE_BOARD;
831 		goto done;
832 	} else if (!strcmp(name, "Nintendo RVL-CNT-01-UC")) {
833 		devtype = WIIMOTE_DEV_PRO_CONTROLLER;
834 		goto done;
835 	}
836 
837 	if (vendor == USB_VENDOR_ID_NINTENDO) {
838 		if (product == USB_DEVICE_ID_NINTENDO_WIIMOTE) {
839 			devtype = WIIMOTE_DEV_GEN10;
840 			goto done;
841 		} else if (product == USB_DEVICE_ID_NINTENDO_WIIMOTE2) {
842 			devtype = WIIMOTE_DEV_GEN20;
843 			goto done;
844 		}
845 	}
846 
847 done:
848 	if (devtype == WIIMOTE_DEV_GENERIC)
849 		hid_info(wdata->hdev, "cannot detect device; NAME: %s VID: %04x PID: %04x EXT: %04x\n",
850 			name, vendor, product, exttype);
851 	else
852 		hid_info(wdata->hdev, "detected device: %s\n",
853 			 wiimote_devtype_names[devtype]);
854 
855 	wiimote_modules_load(wdata, devtype);
856 }
857 
858 static void wiimote_init_detect(struct wiimote_data *wdata)
859 {
860 	__u8 exttype = WIIMOTE_EXT_NONE, extdata[6];
861 	bool ext;
862 	int ret;
863 
864 	wiimote_cmd_acquire_noint(wdata);
865 
866 	spin_lock_irq(&wdata->state.lock);
867 	wdata->state.devtype = WIIMOTE_DEV_UNKNOWN;
868 	wiimote_cmd_set(wdata, WIIPROTO_REQ_SREQ, 0);
869 	wiiproto_req_status(wdata);
870 	spin_unlock_irq(&wdata->state.lock);
871 
872 	ret = wiimote_cmd_wait_noint(wdata);
873 	if (ret)
874 		goto out_release;
875 
876 	spin_lock_irq(&wdata->state.lock);
877 	ext = wdata->state.flags & WIIPROTO_FLAG_EXT_PLUGGED;
878 	spin_unlock_irq(&wdata->state.lock);
879 
880 	if (!ext)
881 		goto out_release;
882 
883 	wiimote_cmd_init_ext(wdata);
884 	exttype = wiimote_cmd_read_ext(wdata, extdata);
885 
886 out_release:
887 	wiimote_cmd_release(wdata);
888 	wiimote_init_set_type(wdata, exttype);
889 
890 	/* schedule MP timer */
891 	spin_lock_irq(&wdata->state.lock);
892 	if (!(wdata->state.flags & WIIPROTO_FLAG_BUILTIN_MP) &&
893 	    !(wdata->state.flags & WIIPROTO_FLAG_NO_MP))
894 		mod_timer(&wdata->timer, jiffies + HZ * 4);
895 	spin_unlock_irq(&wdata->state.lock);
896 }
897 
898 /*
899  * MP hotplug events are not generated by the wiimote. Therefore, we need
900  * polling to detect it. We use a 4s interval for polling MP registers. This
901  * seems reasonable considering applications can trigger it manually via
902  * sysfs requests.
903  */
904 static void wiimote_init_poll_mp(struct wiimote_data *wdata)
905 {
906 	bool mp;
907 	__u8 mpdata[6];
908 
909 	wiimote_cmd_acquire_noint(wdata);
910 	wiimote_cmd_init_mp(wdata);
911 	mp = wiimote_cmd_read_mp(wdata, mpdata);
912 	wiimote_cmd_release(wdata);
913 
914 	/* load/unload MP module if it changed */
915 	if (mp) {
916 		if (!wdata->state.mp) {
917 			hid_info(wdata->hdev, "detected extension: Nintendo Wii Motion Plus\n");
918 			wiimote_mp_load(wdata);
919 		}
920 	} else if (wdata->state.mp) {
921 		wiimote_mp_unload(wdata);
922 	}
923 
924 	mod_timer(&wdata->timer, jiffies + HZ * 4);
925 }
926 
927 /*
928  * Check whether the wiimote is in the expected state. The extension registers
929  * may change during hotplug and initialization so we might get hotplug events
930  * that we caused by remapping some memory.
931  * We use some heuristics here to check known states. If the wiimote is in the
932  * expected state, we can ignore the hotplug event.
933  *
934  * Returns "true" if the device is in expected state, "false" if we should
935  * redo hotplug handling and extension initialization.
936  */
937 static bool wiimote_init_check(struct wiimote_data *wdata)
938 {
939 	__u32 flags;
940 	__u8 type, data[6];
941 	bool ret, poll_mp;
942 
943 	spin_lock_irq(&wdata->state.lock);
944 	flags = wdata->state.flags;
945 	spin_unlock_irq(&wdata->state.lock);
946 
947 	wiimote_cmd_acquire_noint(wdata);
948 
949 	/* If MP is used and active, but the extension is not, we expect:
950 	 *   read_mp_mapped() == WIIMOTE_MP_SINGLE
951 	 *   state.flags == !EXT_ACTIVE && !MP_PLUGGED && MP_ACTIVE
952 	 * We do not check EXT_PLUGGED because it might change during
953 	 * initialization of MP without extensions.
954 	 *  - If MP is unplugged/replugged, read_mp_mapped() fails
955 	 *  - If EXT is plugged, MP_PLUGGED will get set */
956 	if (wdata->state.exttype == WIIMOTE_EXT_NONE &&
957 	    wdata->state.mp > 0 && (flags & WIIPROTO_FLAG_MP_USED)) {
958 		type = wiimote_cmd_read_mp_mapped(wdata);
959 		ret = type == WIIMOTE_MP_SINGLE;
960 
961 		spin_lock_irq(&wdata->state.lock);
962 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_EXT_ACTIVE);
963 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_MP_PLUGGED);
964 		ret = ret && (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE);
965 		spin_unlock_irq(&wdata->state.lock);
966 
967 		if (!ret)
968 			hid_dbg(wdata->hdev, "state left: !EXT && MP\n");
969 
970 		/* while MP is mapped, we get EXT_PLUGGED events */
971 		poll_mp = false;
972 
973 		goto out_release;
974 	}
975 
976 	/* If MP is unused, but the extension port is used, we expect:
977 	 *   read_ext == state.exttype
978 	 *   state.flags == !MP_ACTIVE && EXT_ACTIVE
979 	 * - If MP is plugged/unplugged, our timer detects it
980 	 * - If EXT is unplugged/replugged, EXT_ACTIVE will become unset */
981 	if (!(flags & WIIPROTO_FLAG_MP_USED) &&
982 	    wdata->state.exttype != WIIMOTE_EXT_NONE) {
983 		type = wiimote_cmd_read_ext(wdata, data);
984 		ret = type == wdata->state.exttype;
985 
986 		spin_lock_irq(&wdata->state.lock);
987 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE);
988 		ret = ret && (wdata->state.flags & WIIPROTO_FLAG_EXT_ACTIVE);
989 		spin_unlock_irq(&wdata->state.lock);
990 
991 		if (!ret)
992 			hid_dbg(wdata->hdev, "state left: EXT && !MP\n");
993 
994 		/* poll MP for hotplug events */
995 		poll_mp = true;
996 
997 		goto out_release;
998 	}
999 
1000 	/* If neither MP nor an extension are used, we expect:
1001 	 *   read_ext() == WIIMOTE_EXT_NONE
1002 	 *   state.flags == !MP_ACTIVE && !EXT_ACTIVE && !EXT_PLUGGED
1003 	 * No need to perform any action in this case as everything is
1004 	 * disabled already.
1005 	 * - If MP is plugged/unplugged, our timer detects it
1006 	 * - If EXT is plugged, EXT_PLUGGED will be set */
1007 	if (!(flags & WIIPROTO_FLAG_MP_USED) &&
1008 	    wdata->state.exttype == WIIMOTE_EXT_NONE) {
1009 		type = wiimote_cmd_read_ext(wdata, data);
1010 		ret = type == wdata->state.exttype;
1011 
1012 		spin_lock_irq(&wdata->state.lock);
1013 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_EXT_ACTIVE);
1014 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE);
1015 		ret = ret && !(wdata->state.flags & WIIPROTO_FLAG_EXT_PLUGGED);
1016 		spin_unlock_irq(&wdata->state.lock);
1017 
1018 		if (!ret)
1019 			hid_dbg(wdata->hdev, "state left: !EXT && !MP\n");
1020 
1021 		/* poll MP for hotplug events */
1022 		poll_mp = true;
1023 
1024 		goto out_release;
1025 	}
1026 
1027 	/* The trickiest part is if both EXT and MP are active. We cannot read
1028 	 * the EXT ID, anymore, because MP is mapped over it. However, we use
1029 	 * a handy trick here:
1030 	 *   - EXT_ACTIVE is unset whenever !MP_PLUGGED is sent
1031 	 * MP_PLUGGED might be re-sent again before we are scheduled, but
1032 	 * EXT_ACTIVE will stay unset.
1033 	 * So it is enough to check for mp_mapped() and MP_ACTIVE and
1034 	 * EXT_ACTIVE. EXT_PLUGGED is a sanity check. */
1035 	if (wdata->state.exttype != WIIMOTE_EXT_NONE &&
1036 	    wdata->state.mp > 0 && (flags & WIIPROTO_FLAG_MP_USED)) {
1037 		type = wiimote_cmd_read_mp_mapped(wdata);
1038 		ret = type != WIIMOTE_MP_NONE;
1039 		ret = ret && type != WIIMOTE_MP_UNKNOWN;
1040 		ret = ret && type != WIIMOTE_MP_SINGLE;
1041 
1042 		spin_lock_irq(&wdata->state.lock);
1043 		ret = ret && (wdata->state.flags & WIIPROTO_FLAG_EXT_PLUGGED);
1044 		ret = ret && (wdata->state.flags & WIIPROTO_FLAG_EXT_ACTIVE);
1045 		ret = ret && (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE);
1046 		spin_unlock_irq(&wdata->state.lock);
1047 
1048 		if (!ret)
1049 			hid_dbg(wdata->hdev, "state left: EXT && MP\n");
1050 
1051 		/* while MP is mapped, we get EXT_PLUGGED events */
1052 		poll_mp = false;
1053 
1054 		goto out_release;
1055 	}
1056 
1057 	/* unknown state */
1058 	ret = false;
1059 
1060 out_release:
1061 	wiimote_cmd_release(wdata);
1062 
1063 	/* only poll for MP if requested and if state didn't change */
1064 	if (ret && poll_mp && !(flags & WIIPROTO_FLAG_BUILTIN_MP) &&
1065 	    !(flags & WIIPROTO_FLAG_NO_MP))
1066 		wiimote_init_poll_mp(wdata);
1067 
1068 	return ret;
1069 }
1070 
1071 static const char *wiimote_exttype_names[WIIMOTE_EXT_NUM] = {
1072 	[WIIMOTE_EXT_NONE] = "None",
1073 	[WIIMOTE_EXT_UNKNOWN] = "Unknown",
1074 	[WIIMOTE_EXT_NUNCHUK] = "Nintendo Wii Nunchuk",
1075 	[WIIMOTE_EXT_CLASSIC_CONTROLLER] = "Nintendo Wii Classic Controller",
1076 	[WIIMOTE_EXT_BALANCE_BOARD] = "Nintendo Wii Balance Board",
1077 	[WIIMOTE_EXT_PRO_CONTROLLER] = "Nintendo Wii U Pro Controller",
1078 };
1079 
1080 /*
1081  * Handle hotplug events
1082  * If we receive an hotplug event and the device-check failed, we deinitialize
1083  * the extension ports, re-read all extension IDs and set the device into
1084  * the desired state. This involves mapping MP into the main extension
1085  * registers, setting up extension passthrough modes and initializing the
1086  * requested extensions.
1087  */
1088 static void wiimote_init_hotplug(struct wiimote_data *wdata)
1089 {
1090 	__u8 exttype, extdata[6], mpdata[6];
1091 	__u32 flags;
1092 	bool mp;
1093 
1094 	hid_dbg(wdata->hdev, "detect extensions..\n");
1095 
1096 	wiimote_cmd_acquire_noint(wdata);
1097 
1098 	spin_lock_irq(&wdata->state.lock);
1099 
1100 	/* get state snapshot that we will then work on */
1101 	flags = wdata->state.flags;
1102 
1103 	/* disable event forwarding temporarily */
1104 	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_ACTIVE;
1105 	wdata->state.flags &= ~WIIPROTO_FLAG_MP_ACTIVE;
1106 
1107 	spin_unlock_irq(&wdata->state.lock);
1108 
1109 	/* init extension and MP (deactivates current extension or MP) */
1110 	wiimote_cmd_init_ext(wdata);
1111 	if (flags & WIIPROTO_FLAG_NO_MP) {
1112 		mp = false;
1113 	} else {
1114 		wiimote_cmd_init_mp(wdata);
1115 		mp = wiimote_cmd_read_mp(wdata, mpdata);
1116 	}
1117 	exttype = wiimote_cmd_read_ext(wdata, extdata);
1118 
1119 	wiimote_cmd_release(wdata);
1120 
1121 	/* load/unload extension module if it changed */
1122 	if (exttype != wdata->state.exttype) {
1123 		/* unload previous extension */
1124 		wiimote_ext_unload(wdata);
1125 
1126 		if (exttype == WIIMOTE_EXT_UNKNOWN) {
1127 			hid_info(wdata->hdev, "cannot detect extension; %6phC\n",
1128 				 extdata);
1129 		} else if (exttype == WIIMOTE_EXT_NONE) {
1130 			spin_lock_irq(&wdata->state.lock);
1131 			wdata->state.exttype = WIIMOTE_EXT_NONE;
1132 			spin_unlock_irq(&wdata->state.lock);
1133 		} else {
1134 			hid_info(wdata->hdev, "detected extension: %s\n",
1135 				 wiimote_exttype_names[exttype]);
1136 			/* try loading new extension */
1137 			wiimote_ext_load(wdata, exttype);
1138 		}
1139 	}
1140 
1141 	/* load/unload MP module if it changed */
1142 	if (mp) {
1143 		if (!wdata->state.mp) {
1144 			hid_info(wdata->hdev, "detected extension: Nintendo Wii Motion Plus\n");
1145 			wiimote_mp_load(wdata);
1146 		}
1147 	} else if (wdata->state.mp) {
1148 		wiimote_mp_unload(wdata);
1149 	}
1150 
1151 	/* if MP is not used, do not map or activate it */
1152 	if (!(flags & WIIPROTO_FLAG_MP_USED))
1153 		mp = false;
1154 
1155 	/* map MP into main extension registers if used */
1156 	if (mp) {
1157 		wiimote_cmd_acquire_noint(wdata);
1158 		wiimote_cmd_map_mp(wdata, exttype);
1159 		wiimote_cmd_release(wdata);
1160 
1161 		/* delete MP hotplug timer */
1162 		del_timer_sync(&wdata->timer);
1163 	} else {
1164 		/* reschedule MP hotplug timer */
1165 		if (!(flags & WIIPROTO_FLAG_BUILTIN_MP) &&
1166 		    !(flags & WIIPROTO_FLAG_NO_MP))
1167 			mod_timer(&wdata->timer, jiffies + HZ * 4);
1168 	}
1169 
1170 	spin_lock_irq(&wdata->state.lock);
1171 
1172 	/* enable data forwarding again and set expected hotplug state */
1173 	if (mp) {
1174 		wdata->state.flags |= WIIPROTO_FLAG_MP_ACTIVE;
1175 		if (wdata->state.exttype == WIIMOTE_EXT_NONE) {
1176 			wdata->state.flags &= ~WIIPROTO_FLAG_EXT_PLUGGED;
1177 			wdata->state.flags &= ~WIIPROTO_FLAG_MP_PLUGGED;
1178 		} else {
1179 			wdata->state.flags &= ~WIIPROTO_FLAG_EXT_PLUGGED;
1180 			wdata->state.flags |= WIIPROTO_FLAG_MP_PLUGGED;
1181 			wdata->state.flags |= WIIPROTO_FLAG_EXT_ACTIVE;
1182 		}
1183 	} else if (wdata->state.exttype != WIIMOTE_EXT_NONE) {
1184 		wdata->state.flags |= WIIPROTO_FLAG_EXT_ACTIVE;
1185 	}
1186 
1187 	/* request status report for hotplug state updates */
1188 	wiiproto_req_status(wdata);
1189 
1190 	spin_unlock_irq(&wdata->state.lock);
1191 
1192 	hid_dbg(wdata->hdev, "detected extensions: MP: %d EXT: %d\n",
1193 		wdata->state.mp, wdata->state.exttype);
1194 }
1195 
1196 static void wiimote_init_worker(struct work_struct *work)
1197 {
1198 	struct wiimote_data *wdata = container_of(work, struct wiimote_data,
1199 						  init_worker);
1200 	bool changed = false;
1201 
1202 	if (wdata->state.devtype == WIIMOTE_DEV_PENDING) {
1203 		wiimote_init_detect(wdata);
1204 		changed = true;
1205 	}
1206 
1207 	if (changed || !wiimote_init_check(wdata))
1208 		wiimote_init_hotplug(wdata);
1209 
1210 	if (changed)
1211 		kobject_uevent(&wdata->hdev->dev.kobj, KOBJ_CHANGE);
1212 }
1213 
1214 void __wiimote_schedule(struct wiimote_data *wdata)
1215 {
1216 	if (!(wdata->state.flags & WIIPROTO_FLAG_EXITING))
1217 		schedule_work(&wdata->init_worker);
1218 }
1219 
1220 static void wiimote_schedule(struct wiimote_data *wdata)
1221 {
1222 	unsigned long flags;
1223 
1224 	spin_lock_irqsave(&wdata->state.lock, flags);
1225 	__wiimote_schedule(wdata);
1226 	spin_unlock_irqrestore(&wdata->state.lock, flags);
1227 }
1228 
1229 static void wiimote_init_timeout(unsigned long arg)
1230 {
1231 	struct wiimote_data *wdata = (void*)arg;
1232 
1233 	wiimote_schedule(wdata);
1234 }
1235 
1236 /* protocol handlers */
1237 
1238 static void handler_keys(struct wiimote_data *wdata, const __u8 *payload)
1239 {
1240 	const __u8 *iter, *mods;
1241 	const struct wiimod_ops *ops;
1242 
1243 	ops = wiimod_ext_table[wdata->state.exttype];
1244 	if (ops->in_keys) {
1245 		ops->in_keys(wdata, payload);
1246 		return;
1247 	}
1248 
1249 	mods = wiimote_devtype_mods[wdata->state.devtype];
1250 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
1251 		ops = wiimod_table[*iter];
1252 		if (ops->in_keys) {
1253 			ops->in_keys(wdata, payload);
1254 			break;
1255 		}
1256 	}
1257 }
1258 
1259 static void handler_accel(struct wiimote_data *wdata, const __u8 *payload)
1260 {
1261 	const __u8 *iter, *mods;
1262 	const struct wiimod_ops *ops;
1263 
1264 	ops = wiimod_ext_table[wdata->state.exttype];
1265 	if (ops->in_accel) {
1266 		ops->in_accel(wdata, payload);
1267 		return;
1268 	}
1269 
1270 	mods = wiimote_devtype_mods[wdata->state.devtype];
1271 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
1272 		ops = wiimod_table[*iter];
1273 		if (ops->in_accel) {
1274 			ops->in_accel(wdata, payload);
1275 			break;
1276 		}
1277 	}
1278 }
1279 
1280 static bool valid_ext_handler(const struct wiimod_ops *ops, size_t len)
1281 {
1282 	if (!ops->in_ext)
1283 		return false;
1284 	if ((ops->flags & WIIMOD_FLAG_EXT8) && len < 8)
1285 		return false;
1286 	if ((ops->flags & WIIMOD_FLAG_EXT16) && len < 16)
1287 		return false;
1288 
1289 	return true;
1290 }
1291 
1292 static void handler_ext(struct wiimote_data *wdata, const __u8 *payload,
1293 			size_t len)
1294 {
1295 	static const __u8 invalid[21] = { 0xff, 0xff, 0xff, 0xff,
1296 					  0xff, 0xff, 0xff, 0xff,
1297 					  0xff, 0xff, 0xff, 0xff,
1298 					  0xff, 0xff, 0xff, 0xff,
1299 					  0xff, 0xff, 0xff, 0xff,
1300 					  0xff };
1301 	const __u8 *iter, *mods;
1302 	const struct wiimod_ops *ops;
1303 	bool is_mp;
1304 
1305 	if (len > 21)
1306 		len = 21;
1307 	if (len < 6 || !memcmp(payload, invalid, len))
1308 		return;
1309 
1310 	/* if MP is active, track MP slot hotplugging */
1311 	if (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE) {
1312 		/* this bit is set for invalid events (eg. during hotplug) */
1313 		if (payload[5] & 0x01)
1314 			return;
1315 
1316 		if (payload[4] & 0x01) {
1317 			if (!(wdata->state.flags & WIIPROTO_FLAG_MP_PLUGGED)) {
1318 				hid_dbg(wdata->hdev, "MP hotplug: 1\n");
1319 				wdata->state.flags |= WIIPROTO_FLAG_MP_PLUGGED;
1320 				__wiimote_schedule(wdata);
1321 			}
1322 		} else {
1323 			if (wdata->state.flags & WIIPROTO_FLAG_MP_PLUGGED) {
1324 				hid_dbg(wdata->hdev, "MP hotplug: 0\n");
1325 				wdata->state.flags &= ~WIIPROTO_FLAG_MP_PLUGGED;
1326 				wdata->state.flags &= ~WIIPROTO_FLAG_EXT_ACTIVE;
1327 				__wiimote_schedule(wdata);
1328 			}
1329 		}
1330 
1331 		/* detect MP data that is sent interleaved with EXT data */
1332 		is_mp = payload[5] & 0x02;
1333 	} else {
1334 		is_mp = false;
1335 	}
1336 
1337 	/* ignore EXT events if no extension is active */
1338 	if (!(wdata->state.flags & WIIPROTO_FLAG_EXT_ACTIVE) && !is_mp)
1339 		return;
1340 
1341 	/* try forwarding to extension handler, first */
1342 	ops = wiimod_ext_table[wdata->state.exttype];
1343 	if (is_mp && ops->in_mp) {
1344 		ops->in_mp(wdata, payload);
1345 		return;
1346 	} else if (!is_mp && valid_ext_handler(ops, len)) {
1347 		ops->in_ext(wdata, payload);
1348 		return;
1349 	}
1350 
1351 	/* try forwarding to MP handler */
1352 	ops = &wiimod_mp;
1353 	if (is_mp && ops->in_mp) {
1354 		ops->in_mp(wdata, payload);
1355 		return;
1356 	} else if (!is_mp && valid_ext_handler(ops, len)) {
1357 		ops->in_ext(wdata, payload);
1358 		return;
1359 	}
1360 
1361 	/* try forwarding to loaded modules */
1362 	mods = wiimote_devtype_mods[wdata->state.devtype];
1363 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
1364 		ops = wiimod_table[*iter];
1365 		if (is_mp && ops->in_mp) {
1366 			ops->in_mp(wdata, payload);
1367 			return;
1368 		} else if (!is_mp && valid_ext_handler(ops, len)) {
1369 			ops->in_ext(wdata, payload);
1370 			return;
1371 		}
1372 	}
1373 }
1374 
1375 #define ir_to_input0(wdata, ir, packed) handler_ir((wdata), (ir), (packed), 0)
1376 #define ir_to_input1(wdata, ir, packed) handler_ir((wdata), (ir), (packed), 1)
1377 #define ir_to_input2(wdata, ir, packed) handler_ir((wdata), (ir), (packed), 2)
1378 #define ir_to_input3(wdata, ir, packed) handler_ir((wdata), (ir), (packed), 3)
1379 
1380 static void handler_ir(struct wiimote_data *wdata, const __u8 *payload,
1381 		       bool packed, unsigned int id)
1382 {
1383 	const __u8 *iter, *mods;
1384 	const struct wiimod_ops *ops;
1385 
1386 	ops = wiimod_ext_table[wdata->state.exttype];
1387 	if (ops->in_ir) {
1388 		ops->in_ir(wdata, payload, packed, id);
1389 		return;
1390 	}
1391 
1392 	mods = wiimote_devtype_mods[wdata->state.devtype];
1393 	for (iter = mods; *iter != WIIMOD_NULL; ++iter) {
1394 		ops = wiimod_table[*iter];
1395 		if (ops->in_ir) {
1396 			ops->in_ir(wdata, payload, packed, id);
1397 			break;
1398 		}
1399 	}
1400 }
1401 
1402 /* reduced status report with "BB BB" key data only */
1403 static void handler_status_K(struct wiimote_data *wdata,
1404 			     const __u8 *payload)
1405 {
1406 	handler_keys(wdata, payload);
1407 
1408 	/* on status reports the drm is reset so we need to resend the drm */
1409 	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
1410 }
1411 
1412 /* extended status report with "BB BB LF 00 00 VV" data */
1413 static void handler_status(struct wiimote_data *wdata, const __u8 *payload)
1414 {
1415 	handler_status_K(wdata, payload);
1416 
1417 	/* update extension status */
1418 	if (payload[2] & 0x02) {
1419 		if (!(wdata->state.flags & WIIPROTO_FLAG_EXT_PLUGGED)) {
1420 			hid_dbg(wdata->hdev, "EXT hotplug: 1\n");
1421 			wdata->state.flags |= WIIPROTO_FLAG_EXT_PLUGGED;
1422 			__wiimote_schedule(wdata);
1423 		}
1424 	} else {
1425 		if (wdata->state.flags & WIIPROTO_FLAG_EXT_PLUGGED) {
1426 			hid_dbg(wdata->hdev, "EXT hotplug: 0\n");
1427 			wdata->state.flags &= ~WIIPROTO_FLAG_EXT_PLUGGED;
1428 			wdata->state.flags &= ~WIIPROTO_FLAG_MP_PLUGGED;
1429 			wdata->state.flags &= ~WIIPROTO_FLAG_EXT_ACTIVE;
1430 			wdata->state.flags &= ~WIIPROTO_FLAG_MP_ACTIVE;
1431 			__wiimote_schedule(wdata);
1432 		}
1433 	}
1434 
1435 	wdata->state.cmd_battery = payload[5];
1436 	if (wiimote_cmd_pending(wdata, WIIPROTO_REQ_SREQ, 0))
1437 		wiimote_cmd_complete(wdata);
1438 }
1439 
1440 /* reduced generic report with "BB BB" key data only */
1441 static void handler_generic_K(struct wiimote_data *wdata, const __u8 *payload)
1442 {
1443 	handler_keys(wdata, payload);
1444 }
1445 
1446 static void handler_data(struct wiimote_data *wdata, const __u8 *payload)
1447 {
1448 	__u16 offset = payload[3] << 8 | payload[4];
1449 	__u8 size = (payload[2] >> 4) + 1;
1450 	__u8 err = payload[2] & 0x0f;
1451 
1452 	handler_keys(wdata, payload);
1453 
1454 	if (wiimote_cmd_pending(wdata, WIIPROTO_REQ_RMEM, offset)) {
1455 		if (err)
1456 			size = 0;
1457 		else if (size > wdata->state.cmd_read_size)
1458 			size = wdata->state.cmd_read_size;
1459 
1460 		wdata->state.cmd_read_size = size;
1461 		if (wdata->state.cmd_read_buf)
1462 			memcpy(wdata->state.cmd_read_buf, &payload[5], size);
1463 		wiimote_cmd_complete(wdata);
1464 	}
1465 }
1466 
1467 static void handler_return(struct wiimote_data *wdata, const __u8 *payload)
1468 {
1469 	__u8 err = payload[3];
1470 	__u8 cmd = payload[2];
1471 
1472 	handler_keys(wdata, payload);
1473 
1474 	if (wiimote_cmd_pending(wdata, cmd, 0)) {
1475 		wdata->state.cmd_err = err;
1476 		wiimote_cmd_complete(wdata);
1477 	} else if (err) {
1478 		hid_warn(wdata->hdev, "Remote error %hhu on req %hhu\n", err,
1479 									cmd);
1480 	}
1481 }
1482 
1483 static void handler_drm_KA(struct wiimote_data *wdata, const __u8 *payload)
1484 {
1485 	handler_keys(wdata, payload);
1486 	handler_accel(wdata, payload);
1487 }
1488 
1489 static void handler_drm_KE(struct wiimote_data *wdata, const __u8 *payload)
1490 {
1491 	handler_keys(wdata, payload);
1492 	handler_ext(wdata, &payload[2], 8);
1493 }
1494 
1495 static void handler_drm_KAI(struct wiimote_data *wdata, const __u8 *payload)
1496 {
1497 	handler_keys(wdata, payload);
1498 	handler_accel(wdata, payload);
1499 	ir_to_input0(wdata, &payload[5], false);
1500 	ir_to_input1(wdata, &payload[8], false);
1501 	ir_to_input2(wdata, &payload[11], false);
1502 	ir_to_input3(wdata, &payload[14], false);
1503 }
1504 
1505 static void handler_drm_KEE(struct wiimote_data *wdata, const __u8 *payload)
1506 {
1507 	handler_keys(wdata, payload);
1508 	handler_ext(wdata, &payload[2], 19);
1509 }
1510 
1511 static void handler_drm_KIE(struct wiimote_data *wdata, const __u8 *payload)
1512 {
1513 	handler_keys(wdata, payload);
1514 	ir_to_input0(wdata, &payload[2], false);
1515 	ir_to_input1(wdata, &payload[4], true);
1516 	ir_to_input2(wdata, &payload[7], false);
1517 	ir_to_input3(wdata, &payload[9], true);
1518 	handler_ext(wdata, &payload[12], 9);
1519 }
1520 
1521 static void handler_drm_KAE(struct wiimote_data *wdata, const __u8 *payload)
1522 {
1523 	handler_keys(wdata, payload);
1524 	handler_accel(wdata, payload);
1525 	handler_ext(wdata, &payload[5], 16);
1526 }
1527 
1528 static void handler_drm_KAIE(struct wiimote_data *wdata, const __u8 *payload)
1529 {
1530 	handler_keys(wdata, payload);
1531 	handler_accel(wdata, payload);
1532 	ir_to_input0(wdata, &payload[5], false);
1533 	ir_to_input1(wdata, &payload[7], true);
1534 	ir_to_input2(wdata, &payload[10], false);
1535 	ir_to_input3(wdata, &payload[12], true);
1536 	handler_ext(wdata, &payload[15], 6);
1537 }
1538 
1539 static void handler_drm_E(struct wiimote_data *wdata, const __u8 *payload)
1540 {
1541 	handler_ext(wdata, payload, 21);
1542 }
1543 
1544 static void handler_drm_SKAI1(struct wiimote_data *wdata, const __u8 *payload)
1545 {
1546 	handler_keys(wdata, payload);
1547 
1548 	wdata->state.accel_split[0] = payload[2];
1549 	wdata->state.accel_split[1] = (payload[0] >> 1) & (0x10 | 0x20);
1550 	wdata->state.accel_split[1] |= (payload[1] << 1) & (0x40 | 0x80);
1551 
1552 	ir_to_input0(wdata, &payload[3], false);
1553 	ir_to_input1(wdata, &payload[12], false);
1554 }
1555 
1556 static void handler_drm_SKAI2(struct wiimote_data *wdata, const __u8 *payload)
1557 {
1558 	__u8 buf[5];
1559 
1560 	handler_keys(wdata, payload);
1561 
1562 	wdata->state.accel_split[1] |= (payload[0] >> 5) & (0x01 | 0x02);
1563 	wdata->state.accel_split[1] |= (payload[1] >> 3) & (0x04 | 0x08);
1564 
1565 	buf[0] = 0;
1566 	buf[1] = 0;
1567 	buf[2] = wdata->state.accel_split[0];
1568 	buf[3] = payload[2];
1569 	buf[4] = wdata->state.accel_split[1];
1570 	handler_accel(wdata, buf);
1571 
1572 	ir_to_input2(wdata, &payload[3], false);
1573 	ir_to_input3(wdata, &payload[12], false);
1574 }
1575 
1576 struct wiiproto_handler {
1577 	__u8 id;
1578 	size_t size;
1579 	void (*func)(struct wiimote_data *wdata, const __u8 *payload);
1580 };
1581 
1582 static struct wiiproto_handler handlers[] = {
1583 	{ .id = WIIPROTO_REQ_STATUS, .size = 6, .func = handler_status },
1584 	{ .id = WIIPROTO_REQ_STATUS, .size = 2, .func = handler_status_K },
1585 	{ .id = WIIPROTO_REQ_DATA, .size = 21, .func = handler_data },
1586 	{ .id = WIIPROTO_REQ_DATA, .size = 2, .func = handler_generic_K },
1587 	{ .id = WIIPROTO_REQ_RETURN, .size = 4, .func = handler_return },
1588 	{ .id = WIIPROTO_REQ_RETURN, .size = 2, .func = handler_generic_K },
1589 	{ .id = WIIPROTO_REQ_DRM_K, .size = 2, .func = handler_keys },
1590 	{ .id = WIIPROTO_REQ_DRM_KA, .size = 5, .func = handler_drm_KA },
1591 	{ .id = WIIPROTO_REQ_DRM_KA, .size = 2, .func = handler_generic_K },
1592 	{ .id = WIIPROTO_REQ_DRM_KE, .size = 10, .func = handler_drm_KE },
1593 	{ .id = WIIPROTO_REQ_DRM_KE, .size = 2, .func = handler_generic_K },
1594 	{ .id = WIIPROTO_REQ_DRM_KAI, .size = 17, .func = handler_drm_KAI },
1595 	{ .id = WIIPROTO_REQ_DRM_KAI, .size = 2, .func = handler_generic_K },
1596 	{ .id = WIIPROTO_REQ_DRM_KEE, .size = 21, .func = handler_drm_KEE },
1597 	{ .id = WIIPROTO_REQ_DRM_KEE, .size = 2, .func = handler_generic_K },
1598 	{ .id = WIIPROTO_REQ_DRM_KAE, .size = 21, .func = handler_drm_KAE },
1599 	{ .id = WIIPROTO_REQ_DRM_KAE, .size = 2, .func = handler_generic_K },
1600 	{ .id = WIIPROTO_REQ_DRM_KIE, .size = 21, .func = handler_drm_KIE },
1601 	{ .id = WIIPROTO_REQ_DRM_KIE, .size = 2, .func = handler_generic_K },
1602 	{ .id = WIIPROTO_REQ_DRM_KAIE, .size = 21, .func = handler_drm_KAIE },
1603 	{ .id = WIIPROTO_REQ_DRM_KAIE, .size = 2, .func = handler_generic_K },
1604 	{ .id = WIIPROTO_REQ_DRM_E, .size = 21, .func = handler_drm_E },
1605 	{ .id = WIIPROTO_REQ_DRM_SKAI1, .size = 21, .func = handler_drm_SKAI1 },
1606 	{ .id = WIIPROTO_REQ_DRM_SKAI2, .size = 21, .func = handler_drm_SKAI2 },
1607 	{ .id = 0 }
1608 };
1609 
1610 static int wiimote_hid_event(struct hid_device *hdev, struct hid_report *report,
1611 							u8 *raw_data, int size)
1612 {
1613 	struct wiimote_data *wdata = hid_get_drvdata(hdev);
1614 	struct wiiproto_handler *h;
1615 	int i;
1616 	unsigned long flags;
1617 
1618 	if (size < 1)
1619 		return -EINVAL;
1620 
1621 	spin_lock_irqsave(&wdata->state.lock, flags);
1622 
1623 	for (i = 0; handlers[i].id; ++i) {
1624 		h = &handlers[i];
1625 		if (h->id == raw_data[0] && h->size < size) {
1626 			h->func(wdata, &raw_data[1]);
1627 			break;
1628 		}
1629 	}
1630 
1631 	if (!handlers[i].id)
1632 		hid_warn(hdev, "Unhandled report %hhu size %d\n", raw_data[0],
1633 									size);
1634 
1635 	spin_unlock_irqrestore(&wdata->state.lock, flags);
1636 
1637 	return 0;
1638 }
1639 
1640 static ssize_t wiimote_ext_show(struct device *dev,
1641 				struct device_attribute *attr,
1642 				char *buf)
1643 {
1644 	struct wiimote_data *wdata = dev_to_wii(dev);
1645 	__u8 type;
1646 	unsigned long flags;
1647 
1648 	spin_lock_irqsave(&wdata->state.lock, flags);
1649 	type = wdata->state.exttype;
1650 	spin_unlock_irqrestore(&wdata->state.lock, flags);
1651 
1652 	switch (type) {
1653 	case WIIMOTE_EXT_NONE:
1654 		return sprintf(buf, "none\n");
1655 	case WIIMOTE_EXT_NUNCHUK:
1656 		return sprintf(buf, "nunchuk\n");
1657 	case WIIMOTE_EXT_CLASSIC_CONTROLLER:
1658 		return sprintf(buf, "classic\n");
1659 	case WIIMOTE_EXT_BALANCE_BOARD:
1660 		return sprintf(buf, "balanceboard\n");
1661 	case WIIMOTE_EXT_PRO_CONTROLLER:
1662 		return sprintf(buf, "procontroller\n");
1663 	case WIIMOTE_EXT_UNKNOWN:
1664 		/* fallthrough */
1665 	default:
1666 		return sprintf(buf, "unknown\n");
1667 	}
1668 }
1669 
1670 static ssize_t wiimote_ext_store(struct device *dev,
1671 				 struct device_attribute *attr,
1672 				 const char *buf, size_t count)
1673 {
1674 	struct wiimote_data *wdata = dev_to_wii(dev);
1675 
1676 	if (!strcmp(buf, "scan")) {
1677 		wiimote_schedule(wdata);
1678 	} else {
1679 		return -EINVAL;
1680 	}
1681 
1682 	return strnlen(buf, PAGE_SIZE);
1683 }
1684 
1685 static DEVICE_ATTR(extension, S_IRUGO | S_IWUSR | S_IWGRP, wiimote_ext_show,
1686 		   wiimote_ext_store);
1687 
1688 static ssize_t wiimote_dev_show(struct device *dev,
1689 				struct device_attribute *attr,
1690 				char *buf)
1691 {
1692 	struct wiimote_data *wdata = dev_to_wii(dev);
1693 	__u8 type;
1694 	unsigned long flags;
1695 
1696 	spin_lock_irqsave(&wdata->state.lock, flags);
1697 	type = wdata->state.devtype;
1698 	spin_unlock_irqrestore(&wdata->state.lock, flags);
1699 
1700 	switch (type) {
1701 	case WIIMOTE_DEV_GENERIC:
1702 		return sprintf(buf, "generic\n");
1703 	case WIIMOTE_DEV_GEN10:
1704 		return sprintf(buf, "gen10\n");
1705 	case WIIMOTE_DEV_GEN20:
1706 		return sprintf(buf, "gen20\n");
1707 	case WIIMOTE_DEV_BALANCE_BOARD:
1708 		return sprintf(buf, "balanceboard\n");
1709 	case WIIMOTE_DEV_PRO_CONTROLLER:
1710 		return sprintf(buf, "procontroller\n");
1711 	case WIIMOTE_DEV_PENDING:
1712 		return sprintf(buf, "pending\n");
1713 	case WIIMOTE_DEV_UNKNOWN:
1714 		/* fallthrough */
1715 	default:
1716 		return sprintf(buf, "unknown\n");
1717 	}
1718 }
1719 
1720 static DEVICE_ATTR(devtype, S_IRUGO, wiimote_dev_show, NULL);
1721 
1722 static struct wiimote_data *wiimote_create(struct hid_device *hdev)
1723 {
1724 	struct wiimote_data *wdata;
1725 
1726 	wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
1727 	if (!wdata)
1728 		return NULL;
1729 
1730 	wdata->hdev = hdev;
1731 	hid_set_drvdata(hdev, wdata);
1732 
1733 	spin_lock_init(&wdata->queue.lock);
1734 	INIT_WORK(&wdata->queue.worker, wiimote_queue_worker);
1735 
1736 	spin_lock_init(&wdata->state.lock);
1737 	init_completion(&wdata->state.ready);
1738 	mutex_init(&wdata->state.sync);
1739 	wdata->state.drm = WIIPROTO_REQ_DRM_K;
1740 	wdata->state.cmd_battery = 0xff;
1741 
1742 	INIT_WORK(&wdata->init_worker, wiimote_init_worker);
1743 	setup_timer(&wdata->timer, wiimote_init_timeout, (long)wdata);
1744 
1745 	return wdata;
1746 }
1747 
1748 static void wiimote_destroy(struct wiimote_data *wdata)
1749 {
1750 	unsigned long flags;
1751 
1752 	wiidebug_deinit(wdata);
1753 
1754 	/* prevent init_worker from being scheduled again */
1755 	spin_lock_irqsave(&wdata->state.lock, flags);
1756 	wdata->state.flags |= WIIPROTO_FLAG_EXITING;
1757 	spin_unlock_irqrestore(&wdata->state.lock, flags);
1758 
1759 	cancel_work_sync(&wdata->init_worker);
1760 	del_timer_sync(&wdata->timer);
1761 
1762 	device_remove_file(&wdata->hdev->dev, &dev_attr_devtype);
1763 	device_remove_file(&wdata->hdev->dev, &dev_attr_extension);
1764 
1765 	wiimote_mp_unload(wdata);
1766 	wiimote_ext_unload(wdata);
1767 	wiimote_modules_unload(wdata);
1768 	cancel_work_sync(&wdata->queue.worker);
1769 	hid_hw_close(wdata->hdev);
1770 	hid_hw_stop(wdata->hdev);
1771 
1772 	kfree(wdata);
1773 }
1774 
1775 static int wiimote_hid_probe(struct hid_device *hdev,
1776 				const struct hid_device_id *id)
1777 {
1778 	struct wiimote_data *wdata;
1779 	int ret;
1780 
1781 	hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1782 
1783 	wdata = wiimote_create(hdev);
1784 	if (!wdata) {
1785 		hid_err(hdev, "Can't alloc device\n");
1786 		return -ENOMEM;
1787 	}
1788 
1789 	ret = hid_parse(hdev);
1790 	if (ret) {
1791 		hid_err(hdev, "HID parse failed\n");
1792 		goto err;
1793 	}
1794 
1795 	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1796 	if (ret) {
1797 		hid_err(hdev, "HW start failed\n");
1798 		goto err;
1799 	}
1800 
1801 	ret = hid_hw_open(hdev);
1802 	if (ret) {
1803 		hid_err(hdev, "cannot start hardware I/O\n");
1804 		goto err_stop;
1805 	}
1806 
1807 	ret = device_create_file(&hdev->dev, &dev_attr_extension);
1808 	if (ret) {
1809 		hid_err(hdev, "cannot create sysfs attribute\n");
1810 		goto err_close;
1811 	}
1812 
1813 	ret = device_create_file(&hdev->dev, &dev_attr_devtype);
1814 	if (ret) {
1815 		hid_err(hdev, "cannot create sysfs attribute\n");
1816 		goto err_ext;
1817 	}
1818 
1819 	ret = wiidebug_init(wdata);
1820 	if (ret)
1821 		goto err_free;
1822 
1823 	hid_info(hdev, "New device registered\n");
1824 
1825 	/* schedule device detection */
1826 	wiimote_schedule(wdata);
1827 
1828 	return 0;
1829 
1830 err_free:
1831 	wiimote_destroy(wdata);
1832 	return ret;
1833 
1834 err_ext:
1835 	device_remove_file(&wdata->hdev->dev, &dev_attr_extension);
1836 err_close:
1837 	hid_hw_close(hdev);
1838 err_stop:
1839 	hid_hw_stop(hdev);
1840 err:
1841 	input_free_device(wdata->ir);
1842 	input_free_device(wdata->accel);
1843 	kfree(wdata);
1844 	return ret;
1845 }
1846 
1847 static void wiimote_hid_remove(struct hid_device *hdev)
1848 {
1849 	struct wiimote_data *wdata = hid_get_drvdata(hdev);
1850 
1851 	hid_info(hdev, "Device removed\n");
1852 	wiimote_destroy(wdata);
1853 }
1854 
1855 static const struct hid_device_id wiimote_hid_devices[] = {
1856 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
1857 				USB_DEVICE_ID_NINTENDO_WIIMOTE) },
1858 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
1859 				USB_DEVICE_ID_NINTENDO_WIIMOTE2) },
1860 	{ }
1861 };
1862 MODULE_DEVICE_TABLE(hid, wiimote_hid_devices);
1863 
1864 static struct hid_driver wiimote_hid_driver = {
1865 	.name = "wiimote",
1866 	.id_table = wiimote_hid_devices,
1867 	.probe = wiimote_hid_probe,
1868 	.remove = wiimote_hid_remove,
1869 	.raw_event = wiimote_hid_event,
1870 };
1871 module_hid_driver(wiimote_hid_driver);
1872 
1873 MODULE_LICENSE("GPL");
1874 MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1875 MODULE_DESCRIPTION("Driver for Nintendo Wii / Wii U peripherals");
1876