PRODUCT=19/0/1/0
NAME="Power Button"
PHYS="LNXPWRBN/button/input0"
PROP=0
EV=3
KEY=8000 10000000000000 0
MODALIAS=input:b0019v0000p0001e0000-e0,1,k74,8F,ramlsfw
  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÁƒqÇœ_†I|¥+ÁÀ     /* SPDX-License-Identifier: GPL-2.0 */
/*
 * Greybus operations
 *
 * Copyright 2014 Google Inc.
 * Copyright 2014 Linaro Ltd.
 */

#ifndef __OPERATION_H
#define __OPERATION_H

#include <linux/completion.h>
#include <linux/kref.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/workqueue.h>

struct gb_host_device;
struct gb_operation;

/* The default amount of time a request is given to complete */
#define GB_OPERATION_TIMEOUT_DEFAULT	1000	/* milliseconds */

/*
 * The top bit of the type in an operation message header indicates
 * whether the message is a request (bit clear) or response (bit set)
 */
#define GB_MESSAGE_TYPE_RESPONSE	((u8)0x80)

enum gb_operation_result {
	GB_OP_SUCCESS		= 0x00,
	GB_OP_INTERRUPTED	= 0x01,
	GB_OP_TIMEOUT		= 0x02,
	GB_OP_NO_MEMORY		= 0x03,
	GB_OP_PROTOCOL_BAD	= 0x04,
	GB_OP_OVERFLOW		= 0x05,
	GB_OP_INVALID		= 0x06,
	GB_OP_RETRY		= 0x07,
	GB_OP_NONEXISTENT	= 0x08,
	GB_OP_UNKNOWN_ERROR	= 0xfe,
	GB_OP_MALFUNCTION	= 0xff,
};

#define GB_OPERATION_MESSAGE_SIZE_MIN	sizeof(struct gb_operation_msg_hdr)
#define GB_OPERATION_MESSAGE_SIZE_MAX	U16_MAX

/*
 * Protocol code should only examine the payload and payload_size fields, and
 * host-controller drivers may use the hcpriv field. All other fields are
 * intended to be private to the operations core code.
 */
struct gb_message {
	struct gb_operation		*operation;
	struct gb_operation_msg_hdr	*header;

	void				*payload;
	size_t				payload_size;

	void				*buffer;

	void				*hcpriv;
};

#define GB_OPERATION_FLAG_INCOMING		BIT(0)
#define GB_OPERATION_FLAG_UNIDIRECTIONAL	BIT(1)
#define GB_OPERATION_FLAG_SHORT_RESPONSE	BIT(2)
#define GB_OPERATION_FLAG_CORE			BIT(3)

#define GB_OPERATION_FLAG_USER_MASK	(GB_OPERATION_FLAG_SHORT_RESPONSE | \
					 GB_OPERATION_FLAG_UNIDIRECTIONAL)

/*
 * A Greybus operation is a remote procedure call performed over a
 * connection between two UniPro interfaces.
 *
 * Every operation consists of a request message sent to the other
 * end of the connection coupled with a reply message returned to
 * the sender.  Every operation has a type, whose interpretation is
 * dependent on the protocol associated with the connection.
 *
 * Only four things in an operation structure are intended to be
 * directly usable by protocol handlers:  the operation's connection
 * pointer; the operation type; the request message payload (and
 * size); and the response message payload (and size).  Note that a
 * message with a 0-byte payload has a null message payload pointer.
 *
 * In addition, every operation has a result, which is an errno
 * value.  Protocol handlers access the operation result using
 * gb_operation_result().
 */
typedef void (*gb_operation_callback)(struct gb_operation *);
struct gb_operation {
	struct gb_connection	*connection;
	struct gb_message	*request;
	struct gb_message	*response;

	unsigned long		flags;
	u8			type;
	u16			id;
	int			errno;		/* Operation result */

	struct work_struct	work;
	gb_operation_callback	callback;
	struct completion	completion;
	struct timer_list	timer;

	struct kref		kref;
	atomic_t		waiters;

	int			active;
	struct list_head	links;		/* connection->operations */

	void			*private;
};

static inline bool
gb_operation_is_incoming(struct gb_operation *operation)
{
	return operation->flags & GB_OPERATION_FLAG_INCOMING;
}

static inline bool
gb_operation_is_unidirectional(struct gb_operation *operation)
{
	return operation->flags & GB_OPERATION_FLAG_UNIDIRECTIONAL;
}

static inline bool
gb_operation_short_response_allowed(struct gb_operation *operation)
{
	return operation->flags & GB_OPERATION_FLAG_SHORT_RESPONSE;
}

static inline bool gb_operation_is_core(struct gb_operation *operation)
{
	return operation->flags & GB_OPERATION_FLAG_CORE;
}

void gb_connection_recv(struct gb_connection *connection,
					void *data, size_t size);

int gb_operation_result(struct