[mirror_ubuntu-jammy-kernel.git] / drivers / hid / hid-wiimote.h

#ifndef __HID_WIIMOTE_H
#define __HID_WIIMOTE_H

/*
 * HID driver for Nintendo Wii / Wii U peripherals
 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/completion.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <linux/spinlock.h>

#define WIIMOTE_NAME "Nintendo Wii Remote"
#define WIIMOTE_BUFSIZE 32

#define WIIPROTO_FLAG_LED1		0x01
#define WIIPROTO_FLAG_LED2		0x02
#define WIIPROTO_FLAG_LED3		0x04
#define WIIPROTO_FLAG_LED4		0x08
#define WIIPROTO_FLAG_RUMBLE		0x10
#define WIIPROTO_FLAG_ACCEL		0x20
#define WIIPROTO_FLAG_IR_BASIC		0x40
#define WIIPROTO_FLAG_IR_EXT		0x80
#define WIIPROTO_FLAG_IR_FULL		0xc0 /* IR_BASIC | IR_EXT */
#define WIIPROTO_FLAG_EXT_PLUGGED	0x0100

#define WIIPROTO_FLAGS_LEDS (WIIPROTO_FLAG_LED1 | WIIPROTO_FLAG_LED2 | \
					WIIPROTO_FLAG_LED3 | WIIPROTO_FLAG_LED4)
#define WIIPROTO_FLAGS_IR (WIIPROTO_FLAG_IR_BASIC | WIIPROTO_FLAG_IR_EXT | \
							WIIPROTO_FLAG_IR_FULL)

/* return flag for led \num */
#define WIIPROTO_FLAG_LED(num) (WIIPROTO_FLAG_LED1 << (num - 1))

enum wiiproto_keys {
	WIIPROTO_KEY_LEFT,
	WIIPROTO_KEY_RIGHT,
	WIIPROTO_KEY_UP,
	WIIPROTO_KEY_DOWN,
	WIIPROTO_KEY_PLUS,
	WIIPROTO_KEY_MINUS,
	WIIPROTO_KEY_ONE,
	WIIPROTO_KEY_TWO,
	WIIPROTO_KEY_A,
	WIIPROTO_KEY_B,
	WIIPROTO_KEY_HOME,
	WIIPROTO_KEY_COUNT
};

enum wiimote_devtype {
	WIIMOTE_DEV_PENDING,
	WIIMOTE_DEV_UNKNOWN,
	WIIMOTE_DEV_GENERIC,
	WIIMOTE_DEV_GEN10,
	WIIMOTE_DEV_GEN20,
	WIIMOTE_DEV_NUM,
};

enum wiimote_exttype {
	WIIMOTE_EXT_NONE,
	WIIMOTE_EXT_UNKNOWN,
	WIIMOTE_EXT_NUM,
};

struct wiimote_buf {
	__u8 data[HID_MAX_BUFFER_SIZE];
	size_t size;
};

struct wiimote_queue {
	spinlock_t lock;
	struct work_struct worker;
	__u8 head;
	__u8 tail;
	struct wiimote_buf outq[WIIMOTE_BUFSIZE];
};

struct wiimote_state {
	spinlock_t lock;
	__u32 flags;
	__u8 accel_split[2];
	__u8 drm;
	__u8 devtype;

	/* synchronous cmd requests */
	struct mutex sync;
	struct completion ready;
	int cmd;
	__u32 opt;

	/* results of synchronous requests */
	__u8 cmd_battery;
	__u8 cmd_err;
	__u8 *cmd_read_buf;
	__u8 cmd_read_size;
};

struct wiimote_data {
	struct hid_device *hdev;
	struct input_dev *input;
	struct led_classdev *leds[4];
	struct input_dev *accel;
	struct input_dev *ir;
	struct power_supply battery;
	struct wiimote_ext *ext;
	struct wiimote_debug *debug;

	struct wiimote_queue queue;
	struct wiimote_state state;
	struct work_struct init_worker;
};

/* wiimote modules */

enum wiimod_module {
	WIIMOD_KEYS,
	WIIMOD_RUMBLE,
	WIIMOD_BATTERY,
	WIIMOD_LED1,
	WIIMOD_LED2,
	WIIMOD_LED3,
	WIIMOD_LED4,
	WIIMOD_ACCEL,
	WIIMOD_NUM,
	WIIMOD_NULL = WIIMOD_NUM,
};

#define WIIMOD_FLAG_INPUT		0x0001

struct wiimod_ops {
	__u16 flags;
	unsigned long arg;
	int (*probe) (const struct wiimod_ops *ops,
		      struct wiimote_data *wdata);
	void (*remove) (const struct wiimod_ops *ops,
			struct wiimote_data *wdata);

	void (*in_keys) (struct wiimote_data *wdata, const __u8 *keys);
	void (*in_accel) (struct wiimote_data *wdata, const __u8 *accel);
	void (*in_ir) (struct wiimote_data *wdata, const __u8 *ir, bool packed,
		       unsigned int id);
};

extern const struct wiimod_ops *wiimod_table[WIIMOD_NUM];

/* wiimote requests */

enum wiiproto_reqs {
	WIIPROTO_REQ_NULL = 0x0,
	WIIPROTO_REQ_RUMBLE = 0x10,
	WIIPROTO_REQ_LED = 0x11,
	WIIPROTO_REQ_DRM = 0x12,
	WIIPROTO_REQ_IR1 = 0x13,
	WIIPROTO_REQ_SREQ = 0x15,
	WIIPROTO_REQ_WMEM = 0x16,
	WIIPROTO_REQ_RMEM = 0x17,
	WIIPROTO_REQ_IR2 = 0x1a,
	WIIPROTO_REQ_STATUS = 0x20,
	WIIPROTO_REQ_DATA = 0x21,
	WIIPROTO_REQ_RETURN = 0x22,
	WIIPROTO_REQ_DRM_K = 0x30,
	WIIPROTO_REQ_DRM_KA = 0x31,
	WIIPROTO_REQ_DRM_KE = 0x32,
	WIIPROTO_REQ_DRM_KAI = 0x33,
	WIIPROTO_REQ_DRM_KEE = 0x34,
	WIIPROTO_REQ_DRM_KAE = 0x35,
	WIIPROTO_REQ_DRM_KIE = 0x36,
	WIIPROTO_REQ_DRM_KAIE = 0x37,
	WIIPROTO_REQ_DRM_E = 0x3d,
	WIIPROTO_REQ_DRM_SKAI1 = 0x3e,
	WIIPROTO_REQ_DRM_SKAI2 = 0x3f,
	WIIPROTO_REQ_MAX
};

#define dev_to_wii(pdev) hid_get_drvdata(container_of(pdev, struct hid_device, \
									dev))

extern void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm);
extern void wiiproto_req_rumble(struct wiimote_data *wdata, __u8 rumble);
extern void wiiproto_req_leds(struct wiimote_data *wdata, int leds);
extern void wiiproto_req_status(struct wiimote_data *wdata);
extern void wiiproto_req_accel(struct wiimote_data *wdata, __u8 accel);
extern int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
						const __u8 *wmem, __u8 size);
extern ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset,
							__u8 *rmem, __u8 size);

#define wiiproto_req_rreg(wdata, os, sz) \
				wiiproto_req_rmem((wdata), false, (os), (sz))
#define wiiproto_req_reeprom(wdata, os, sz) \
				wiiproto_req_rmem((wdata), true, (os), (sz))
extern void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom,
						__u32 offset, __u16 size);

#ifdef CONFIG_HID_WIIMOTE_EXT

extern int wiiext_init(struct wiimote_data *wdata);
extern void wiiext_deinit(struct wiimote_data *wdata);
extern void wiiext_event(struct wiimote_data *wdata, bool plugged);
extern bool wiiext_active(struct wiimote_data *wdata);
extern void wiiext_handle(struct wiimote_data *wdata, const __u8 *payload);

#else

static inline int wiiext_init(void *u) { return 0; }
static inline void wiiext_deinit(void *u) { }
static inline void wiiext_event(void *u, bool p) { }
static inline bool wiiext_active(void *u) { return false; }
static inline void wiiext_handle(void *u, const __u8 *p) { }

#endif

#ifdef CONFIG_DEBUG_FS

extern int wiidebug_init(struct wiimote_data *wdata);
extern void wiidebug_deinit(struct wiimote_data *wdata);

#else

static inline int wiidebug_init(void *u) { return 0; }
static inline void wiidebug_deinit(void *u) { }

#endif

/* requires the state.lock spinlock to be held */
static inline bool wiimote_cmd_pending(struct wiimote_data *wdata, int cmd,
								__u32 opt)
{
	return wdata->state.cmd == cmd && wdata->state.opt == opt;
}

/* requires the state.lock spinlock to be held */
static inline void wiimote_cmd_complete(struct wiimote_data *wdata)
{
	wdata->state.cmd = WIIPROTO_REQ_NULL;
	complete(&wdata->state.ready);
}

/* requires the state.lock spinlock to be held */
static inline void wiimote_cmd_abort(struct wiimote_data *wdata)
{
	/* Abort synchronous request by waking up the sleeping caller. But
	 * reset the state.cmd field to an invalid value so no further event
	 * handlers will work with it. */
	wdata->state.cmd = WIIPROTO_REQ_MAX;
	complete(&wdata->state.ready);
}

static inline int wiimote_cmd_acquire(struct wiimote_data *wdata)
{
	return mutex_lock_interruptible(&wdata->state.sync) ? -ERESTARTSYS : 0;
}

static inline void wiimote_cmd_acquire_noint(struct wiimote_data *wdata)
{
	mutex_lock(&wdata->state.sync);
}

/* requires the state.lock spinlock to be held */
static inline void wiimote_cmd_set(struct wiimote_data *wdata, int cmd,
								__u32 opt)
{
	INIT_COMPLETION(wdata->state.ready);
	wdata->state.cmd = cmd;
	wdata->state.opt = opt;
}

static inline void wiimote_cmd_release(struct wiimote_data *wdata)
{
	mutex_unlock(&wdata->state.sync);
}

static inline int wiimote_cmd_wait(struct wiimote_data *wdata)
{
	int ret;

	/* The completion acts as implicit memory barrier so we can safely
	 * assume that state.cmd is set on success/failure and isn't accessed
	 * by any other thread, anymore. */

	ret = wait_for_completion_interruptible_timeout(&wdata->state.ready, HZ);
	if (ret < 0)
		return -ERESTARTSYS;
	else if (ret == 0)
		return -EIO;
	else if (wdata->state.cmd != WIIPROTO_REQ_NULL)
		return -EIO;
	else
		return 0;
}

static inline int wiimote_cmd_wait_noint(struct wiimote_data *wdata)
{
	unsigned long ret;

	/* no locking needed; see wiimote_cmd_wait() */
	ret = wait_for_completion_timeout(&wdata->state.ready, HZ);
	if (!ret)
		return -EIO;
	else if (wdata->state.cmd != WIIPROTO_REQ_NULL)
		return -EIO;
	else
		return 0;
}

#endif
Commit	Line	Data
7e274400 DH	1	#ifndef __HID_WIIMOTE_H
	2	#define __HID_WIIMOTE_H
	3
	4	/*
92eda7e4 DH	5	* HID driver for Nintendo Wii / Wii U peripherals
92eda7e4 DH	6	* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
7e274400 DH	7	*/
	8
	9	/*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the Free
	12	* Software Foundation; either version 2 of the License, or (at your option)
	13	* any later version.
	14	*/
	15
	16	#include <linux/completion.h>
	17	#include <linux/device.h>
	18	#include <linux/hid.h>
	19	#include <linux/input.h>
	20	#include <linux/leds.h>
	21	#include <linux/module.h>
	22	#include <linux/mutex.h>
	23	#include <linux/power_supply.h>
	24	#include <linux/spinlock.h>
	25
	26	#define WIIMOTE_NAME "Nintendo Wii Remote"
	27	#define WIIMOTE_BUFSIZE 32
	28
	29	#define WIIPROTO_FLAG_LED1 0x01
	30	#define WIIPROTO_FLAG_LED2 0x02
	31	#define WIIPROTO_FLAG_LED3 0x04
	32	#define WIIPROTO_FLAG_LED4 0x08
	33	#define WIIPROTO_FLAG_RUMBLE 0x10
	34	#define WIIPROTO_FLAG_ACCEL 0x20
	35	#define WIIPROTO_FLAG_IR_BASIC 0x40
	36	#define WIIPROTO_FLAG_IR_EXT 0x80
	37	#define WIIPROTO_FLAG_IR_FULL 0xc0 /* IR_BASIC \| IR_EXT */
c57ff761 DH	38	#define WIIPROTO_FLAG_EXT_PLUGGED 0x0100
c57ff761 DH	39
7e274400 DH	40	#define WIIPROTO_FLAGS_LEDS (WIIPROTO_FLAG_LED1 \| WIIPROTO_FLAG_LED2 \| \
	41	WIIPROTO_FLAG_LED3 \| WIIPROTO_FLAG_LED4)
	42	#define WIIPROTO_FLAGS_IR (WIIPROTO_FLAG_IR_BASIC \| WIIPROTO_FLAG_IR_EXT \| \
	43	WIIPROTO_FLAG_IR_FULL)
	44
	45	/* return flag for led \num */
	46	#define WIIPROTO_FLAG_LED(num) (WIIPROTO_FLAG_LED1 << (num - 1))
	47
20cef813 DH	48	enum wiiproto_keys {
	49	WIIPROTO_KEY_LEFT,
	50	WIIPROTO_KEY_RIGHT,
	51	WIIPROTO_KEY_UP,
	52	WIIPROTO_KEY_DOWN,
	53	WIIPROTO_KEY_PLUS,
	54	WIIPROTO_KEY_MINUS,
	55	WIIPROTO_KEY_ONE,
	56	WIIPROTO_KEY_TWO,
	57	WIIPROTO_KEY_A,
	58	WIIPROTO_KEY_B,
	59	WIIPROTO_KEY_HOME,
	60	WIIPROTO_KEY_COUNT
	61	};
	62
c57ff761 DH	63	enum wiimote_devtype {
	64	WIIMOTE_DEV_PENDING,
	65	WIIMOTE_DEV_UNKNOWN,
	66	WIIMOTE_DEV_GENERIC,
	67	WIIMOTE_DEV_GEN10,
	68	WIIMOTE_DEV_GEN20,
	69	WIIMOTE_DEV_NUM,
	70	};
	71
	72	enum wiimote_exttype {
	73	WIIMOTE_EXT_NONE,
	74	WIIMOTE_EXT_UNKNOWN,
	75	WIIMOTE_EXT_NUM,
	76	};
	77
7e274400 DH	78	struct wiimote_buf {
	79	__u8 data[HID_MAX_BUFFER_SIZE];
	80	size_t size;
	81	};
	82
13938538 DH	83	struct wiimote_queue {
	84	spinlock_t lock;
	85	struct work_struct worker;
	86	__u8 head;
	87	__u8 tail;
	88	struct wiimote_buf outq[WIIMOTE_BUFSIZE];
	89	};
	90
7e274400 DH	91	struct wiimote_state {
7e274400 DH	92	spinlock_t lock;
c57ff761	93	__u32 flags;
7e274400	94	__u8 accel_split[2];
43d782ae	95	__u8 drm;
c57ff761	96	__u8 devtype;
7e274400 DH	97
	98	/* synchronous cmd requests */
	99	struct mutex sync;
	100	struct completion ready;
	101	int cmd;
	102	__u32 opt;
	103
	104	/* results of synchronous requests */
	105	__u8 cmd_battery;
	106	__u8 cmd_err;
fad8c0e3 DH	107	__u8 *cmd_read_buf;
fad8c0e3 DH	108	__u8 cmd_read_size;
7e274400 DH	109	};
	110
	111	struct wiimote_data {
	112	struct hid_device *hdev;
	113	struct input_dev *input;
	114	struct led_classdev *leds[4];
	115	struct input_dev *accel;
	116	struct input_dev *ir;
	117	struct power_supply battery;
cb99221b	118	struct wiimote_ext *ext;
43e5e7c6	119	struct wiimote_debug *debug;
7e274400	120
13938538	121	struct wiimote_queue queue;
7e274400	122	struct wiimote_state state;
c57ff761	123	struct work_struct init_worker;
7e274400 DH	124	};
7e274400 DH	125
27f06942 DH	126	/* wiimote modules */
	127
	128	enum wiimod_module {
20cef813 DH	129	WIIMOD_KEYS,
20cef813 DH	130	WIIMOD_RUMBLE,
dcf39231	131	WIIMOD_BATTERY,
6c5ae018 DH	132	WIIMOD_LED1,
	133	WIIMOD_LED2,
	134	WIIMOD_LED3,
	135	WIIMOD_LED4,
0ea16757	136	WIIMOD_ACCEL,
27f06942 DH	137	WIIMOD_NUM,
	138	WIIMOD_NULL = WIIMOD_NUM,
	139	};
	140
	141	#define WIIMOD_FLAG_INPUT 0x0001
	142
	143	struct wiimod_ops {
	144	__u16 flags;
	145	unsigned long arg;
	146	int (probe) (const struct wiimod_ops ops,
	147	struct wiimote_data *wdata);
	148	void (remove) (const struct wiimod_ops ops,
	149	struct wiimote_data *wdata);
	150
	151	void (in_keys) (struct wiimote_data wdata, const __u8 *keys);
	152	void (in_accel) (struct wiimote_data wdata, const __u8 *accel);
	153	void (in_ir) (struct wiimote_data wdata, const __u8 *ir, bool packed,
	154	unsigned int id);
	155	};
	156
	157	extern const struct wiimod_ops *wiimod_table[WIIMOD_NUM];
	158
	159	/* wiimote requests */
	160
7e274400 DH	161	enum wiiproto_reqs {
	162	WIIPROTO_REQ_NULL = 0x0,
	163	WIIPROTO_REQ_RUMBLE = 0x10,
	164	WIIPROTO_REQ_LED = 0x11,
	165	WIIPROTO_REQ_DRM = 0x12,
	166	WIIPROTO_REQ_IR1 = 0x13,
	167	WIIPROTO_REQ_SREQ = 0x15,
	168	WIIPROTO_REQ_WMEM = 0x16,
	169	WIIPROTO_REQ_RMEM = 0x17,
	170	WIIPROTO_REQ_IR2 = 0x1a,
	171	WIIPROTO_REQ_STATUS = 0x20,
	172	WIIPROTO_REQ_DATA = 0x21,
	173	WIIPROTO_REQ_RETURN = 0x22,
	174	WIIPROTO_REQ_DRM_K = 0x30,
	175	WIIPROTO_REQ_DRM_KA = 0x31,
	176	WIIPROTO_REQ_DRM_KE = 0x32,
	177	WIIPROTO_REQ_DRM_KAI = 0x33,
	178	WIIPROTO_REQ_DRM_KEE = 0x34,
	179	WIIPROTO_REQ_DRM_KAE = 0x35,
	180	WIIPROTO_REQ_DRM_KIE = 0x36,
	181	WIIPROTO_REQ_DRM_KAIE = 0x37,
	182	WIIPROTO_REQ_DRM_E = 0x3d,
	183	WIIPROTO_REQ_DRM_SKAI1 = 0x3e,
	184	WIIPROTO_REQ_DRM_SKAI2 = 0x3f,
43d782ae	185	WIIPROTO_REQ_MAX
7e274400 DH	186	};
	187
	188	#define dev_to_wii(pdev) hid_get_drvdata(container_of(pdev, struct hid_device, \
	189	dev))
	190
	191	extern void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm);
20cef813	192	extern void wiiproto_req_rumble(struct wiimote_data *wdata, __u8 rumble);
6c5ae018	193	extern void wiiproto_req_leds(struct wiimote_data *wdata, int leds);
dcf39231	194	extern void wiiproto_req_status(struct wiimote_data *wdata);
0ea16757	195	extern void wiiproto_req_accel(struct wiimote_data *wdata, __u8 accel);
7e274400 DH	196	extern int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
7e274400 DH	197	const __u8 *wmem, __u8 size);
fad8c0e3 DH	198	extern ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset,
fad8c0e3 DH	199	__u8 *rmem, __u8 size);
7e274400	200
1d3452c6 DH	201	#define wiiproto_req_rreg(wdata, os, sz) \
	202	wiiproto_req_rmem((wdata), false, (os), (sz))
	203	#define wiiproto_req_reeprom(wdata, os, sz) \
	204	wiiproto_req_rmem((wdata), true, (os), (sz))
	205	extern void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom,
	206	__u32 offset, __u16 size);
	207
cb99221b DH	208	#ifdef CONFIG_HID_WIIMOTE_EXT
	209
	210	extern int wiiext_init(struct wiimote_data *wdata);
	211	extern void wiiext_deinit(struct wiimote_data *wdata);
	212	extern void wiiext_event(struct wiimote_data *wdata, bool plugged);
	213	extern bool wiiext_active(struct wiimote_data *wdata);
0b6815d7	214	extern void wiiext_handle(struct wiimote_data wdata, const __u8 payload);
cb99221b DH	215
	216	#else
	217
	218	static inline int wiiext_init(void *u) { return 0; }
	219	static inline void wiiext_deinit(void *u) { }
	220	static inline void wiiext_event(void *u, bool p) { }
	221	static inline bool wiiext_active(void *u) { return false; }
0b6815d7	222	static inline void wiiext_handle(void u, const __u8 p) { }
cb99221b DH	223
	224	#endif
	225
43e5e7c6 DH	226	#ifdef CONFIG_DEBUG_FS
	227
	228	extern int wiidebug_init(struct wiimote_data *wdata);
	229	extern void wiidebug_deinit(struct wiimote_data *wdata);
	230
	231	#else
	232
	233	static inline int wiidebug_init(void *u) { return 0; }
	234	static inline void wiidebug_deinit(void *u) { }
	235
	236	#endif
	237
7e274400 DH	238	/* requires the state.lock spinlock to be held */
	239	static inline bool wiimote_cmd_pending(struct wiimote_data *wdata, int cmd,
	240	__u32 opt)
	241	{
	242	return wdata->state.cmd == cmd && wdata->state.opt == opt;
	243	}
	244
	245	/* requires the state.lock spinlock to be held */
	246	static inline void wiimote_cmd_complete(struct wiimote_data *wdata)
	247	{
	248	wdata->state.cmd = WIIPROTO_REQ_NULL;
	249	complete(&wdata->state.ready);
	250	}
	251
d758b1f0 DH	252	/* requires the state.lock spinlock to be held */
	253	static inline void wiimote_cmd_abort(struct wiimote_data *wdata)
	254	{
	255	/* Abort synchronous request by waking up the sleeping caller. But
	256	* reset the state.cmd field to an invalid value so no further event
	257	* handlers will work with it. */
	258	wdata->state.cmd = WIIPROTO_REQ_MAX;
	259	complete(&wdata->state.ready);
	260	}
	261
7e274400 DH	262	static inline int wiimote_cmd_acquire(struct wiimote_data *wdata)
	263	{
	264	return mutex_lock_interruptible(&wdata->state.sync) ? -ERESTARTSYS : 0;
	265	}
	266
c57ff761 DH	267	static inline void wiimote_cmd_acquire_noint(struct wiimote_data *wdata)
	268	{
	269	mutex_lock(&wdata->state.sync);
	270	}
	271
7e274400 DH	272	/* requires the state.lock spinlock to be held */
	273	static inline void wiimote_cmd_set(struct wiimote_data *wdata, int cmd,
	274	__u32 opt)
	275	{
	276	INIT_COMPLETION(wdata->state.ready);
	277	wdata->state.cmd = cmd;
	278	wdata->state.opt = opt;
	279	}
	280
	281	static inline void wiimote_cmd_release(struct wiimote_data *wdata)
	282	{
	283	mutex_unlock(&wdata->state.sync);
	284	}
	285
	286	static inline int wiimote_cmd_wait(struct wiimote_data *wdata)
	287	{
	288	int ret;
	289
d758b1f0 DH	290	/* The completion acts as implicit memory barrier so we can safely
	291	* assume that state.cmd is set on success/failure and isn't accessed
	292	* by any other thread, anymore. */
	293
7e274400 DH	294	ret = wait_for_completion_interruptible_timeout(&wdata->state.ready, HZ);
	295	if (ret < 0)
	296	return -ERESTARTSYS;
	297	else if (ret == 0)
	298	return -EIO;
d758b1f0 DH	299	else if (wdata->state.cmd != WIIPROTO_REQ_NULL)
d758b1f0 DH	300	return -EIO;
7e274400 DH	301	else
	302	return 0;
	303	}
	304
c57ff761 DH	305	static inline int wiimote_cmd_wait_noint(struct wiimote_data *wdata)
	306	{
	307	unsigned long ret;
	308
d758b1f0	309	/* no locking needed; see wiimote_cmd_wait() */
c57ff761 DH	310	ret = wait_for_completion_timeout(&wdata->state.ready, HZ);
	311	if (!ret)
	312	return -EIO;
d758b1f0 DH	313	else if (wdata->state.cmd != WIIPROTO_REQ_NULL)
d758b1f0 DH	314	return -EIO;
c57ff761 DH	315	else
	316	return 0;
	317	}
	318
7e274400	319	#endif