include/media/cec.h - kernel/msm-4.19 - Gitiles

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * cec - HDMI Consumer Electronics Control support header
  *
  * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
  */

 #ifndef _MEDIA_CEC_H
 #define _MEDIA_CEC_H

 #include <linux/poll.h>
 #include <linux/fs.h>
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/cdev.h>
 #include <linux/kthread.h>
 #include <linux/timer.h>
 #include <linux/cec-funcs.h>
 #include <media/rc-core.h>
 #include <media/cec-notifier.h>

 #define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | \
 			  CEC_CAP_PASSTHROUGH | CEC_CAP_RC)

 /**
  * struct cec_devnode - cec device node
  * @dev:	cec device
  * @cdev:	cec character device
  * @minor:	device node minor number
  * @registered:	the device was correctly registered
  * @unregistered: the device was unregistered
  * @fhs_lock:	lock to control access to the filehandle list
  * @fhs:	the list of open filehandles (cec_fh)
  *
  * This structure represents a cec-related device node.
  *
  * The @parent is a physical device. It must be set by core or device drivers
  * before registering the node.
  */
 struct cec_devnode {
 	/* sysfs */
 	struct device dev;
 	struct cdev cdev;

 	/* device info */
 	int minor;
 	bool registered;
 	bool unregistered;
 	struct list_head fhs;
 	struct mutex lock;
 };

 struct cec_adapter;
 struct cec_data;
 struct cec_pin;

 struct cec_data {
 	struct list_head list;
 	struct list_head xfer_list;
 	struct cec_adapter *adap;
 	struct cec_msg msg;
 	struct cec_fh *fh;
 	struct delayed_work work;
 	struct completion c;
 	u8 attempts;
 	bool blocking;
 	bool completed;
 };

 struct cec_msg_entry {
 	struct list_head	list;
 	struct cec_msg		msg;
 };

 struct cec_event_entry {
 	struct list_head	list;
 	struct cec_event	ev;
 };

 #define CEC_NUM_CORE_EVENTS 2
 #define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH

 struct cec_fh {
 	struct list_head	list;
 	struct list_head	xfer_list;
 	struct cec_adapter	*adap;
 	u8			mode_initiator;
 	u8			mode_follower;

 	/* Events */
 	wait_queue_head_t	wait;
 	struct mutex		lock;
 	struct list_head	events[CEC_NUM_EVENTS]; /* queued events */
 	u16			queued_events[CEC_NUM_EVENTS];
 	unsigned int		total_queued_events;
 	struct cec_event_entry	core_events[CEC_NUM_CORE_EVENTS];
 	struct list_head	msgs; /* queued messages */
 	unsigned int		queued_msgs;
 };

 #define CEC_SIGNAL_FREE_TIME_RETRY		3
 #define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR	5
 #define CEC_SIGNAL_FREE_TIME_NEXT_XFER		7

 /* The nominal data bit period is 2.4 ms */
 #define CEC_FREE_TIME_TO_USEC(ft)		((ft) * 2400)

 struct cec_adap_ops {
 	/* Low-level callbacks */
 	int (*adap_enable)(struct cec_adapter *adap, bool enable);
 	int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
 	int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable);
 	int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
 	int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
 			     u32 signal_free_time, struct cec_msg *msg);
 	void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
 	void (*adap_free)(struct cec_adapter *adap);

 	/* Error injection callbacks */
 	int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
 	bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);

 	/* High-level CEC message callback */
 	int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
 };

 /*
  * The minimum message length you can receive (excepting poll messages) is 2.
  * With a transfer rate of at most 36 bytes per second this makes 18 messages
  * per second worst case.
  *
  * We queue at most 3 seconds worth of received messages. The CEC specification
  * requires that messages are replied to within a second, so 3 seconds should
  * give more than enough margin. Since most messages are actually more than 2
  * bytes, this is in practice a lot more than 3 seconds.
  */
 #define CEC_MAX_MSG_RX_QUEUE_SZ		(18 * 3)

 /*
  * The transmit queue is limited to 1 second worth of messages (worst case).
  * Messages can be transmitted by userspace and kernel space. But for both it
  * makes no sense to have a lot of messages queued up. One second seems
  * reasonable.
  */
 #define CEC_MAX_MSG_TX_QUEUE_SZ		(18 * 1)

 struct cec_adapter {
 	struct module *owner;
 	char name[32];
 	struct cec_devnode devnode;
 	struct mutex lock;
 	struct rc_dev *rc;

 	struct list_head transmit_queue;
 	unsigned int transmit_queue_sz;
 	struct list_head wait_queue;
 	struct cec_data *transmitting;
 	bool transmit_in_progress;

 	struct task_struct *kthread_config;
 	struct completion config_completion;

 	struct task_struct *kthread;
 	wait_queue_head_t kthread_waitq;
 	wait_queue_head_t waitq;

 	const struct cec_adap_ops *ops;
 	void *priv;
 	u32 capabilities;
 	u8 available_log_addrs;

 	u16 phys_addr;
 	bool needs_hpd;
 	bool is_configuring;
 	bool is_configured;
 	bool cec_pin_is_high;
 	u8 last_initiator;
 	u32 monitor_all_cnt;
 	u32 monitor_pin_cnt;
 	u32 follower_cnt;
 	struct cec_fh *cec_follower;
 	struct cec_fh *cec_initiator;
 	bool passthrough;
 	struct cec_log_addrs log_addrs;

 	u32 tx_timeouts;

 #ifdef CONFIG_CEC_NOTIFIER
 	struct cec_notifier *notifier;
 #endif
 #ifdef CONFIG_CEC_PIN
 	struct cec_pin *pin;
 #endif

 	struct dentry *cec_dir;
 	struct dentry *status_file;
 	struct dentry *error_inj_file;

 	u16 phys_addrs[15];
 	u32 sequence;

 	char device_name[32];
 	char input_phys[32];
 	char input_drv[32];
 };

 static inline void *cec_get_drvdata(const struct cec_adapter *adap)
 {
 	return adap->priv;
 }

 static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr)
 {
 	return adap->log_addrs.log_addr_mask & (1 << log_addr);
 }

 static inline bool cec_is_sink(const struct cec_adapter *adap)
 {
 	return adap->phys_addr == 0;
 }

 /**
  * cec_is_registered() - is the CEC adapter registered?
  *
  * @adap:	the CEC adapter, may be NULL.
  *
  * Return: true if the adapter is registered, false otherwise.
  */
 static inline bool cec_is_registered(const struct cec_adapter *adap)
 {
 	return adap && adap->devnode.registered;
 }

 #define cec_phys_addr_exp(pa) \
 	((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf

 struct edid;

 #if IS_REACHABLE(CONFIG_CEC_CORE)
 struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
 		void *priv, const char *name, u32 caps, u8 available_las);
 int cec_register_adapter(struct cec_adapter *adap, struct device *parent);
 void cec_unregister_adapter(struct cec_adapter *adap);
 void cec_delete_adapter(struct cec_adapter *adap);

 int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs,
 		    bool block);
 void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
 		     bool block);
 void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
 			       const struct edid *edid);
 int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
 		     bool block);

 /* Called by the adapter */
 void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
 			  u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
 			  u8 error_cnt, ktime_t ts);

 static inline void cec_transmit_done(struct cec_adapter *adap, u8 status,
 				     u8 arb_lost_cnt, u8 nack_cnt,
 				     u8 low_drive_cnt, u8 error_cnt)
 {
 	cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt,
 			     low_drive_cnt, error_cnt, ktime_get());
 }
 /*
  * Simplified version of cec_transmit_done for hardware that doesn't retry
  * failed transmits. So this is always just one attempt in which case
  * the status is sufficient.
  */
 void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
 				  u8 status, ktime_t ts);

 static inline void cec_transmit_attempt_done(struct cec_adapter *adap,
 					     u8 status)
 {
 	cec_transmit_attempt_done_ts(adap, status, ktime_get());
 }

 void cec_received_msg_ts(struct cec_adapter *adap,
 			 struct cec_msg *msg, ktime_t ts);

 static inline void cec_received_msg(struct cec_adapter *adap,
 				    struct cec_msg *msg)
 {
 	cec_received_msg_ts(adap, msg, ktime_get());
 }

 /**
  * cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp.
  *
  * @adap:	pointer to the cec adapter
  * @is_high:	when true the CEC pin is high, otherwise it is low
  * @dropped_events: when true some events were dropped
  * @ts:		the timestamp for this event
  *
  */
 void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
 			     bool dropped_events, ktime_t ts);

 /**
  * cec_queue_pin_hpd_event() - queue a pin event with a given timestamp.
  *
  * @adap:	pointer to the cec adapter
  * @is_high:	when true the HPD pin is high, otherwise it is low
  * @ts:		the timestamp for this event
  *
  */
 void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);

 /**
  * cec_queue_pin_5v_event() - queue a pin event with a given timestamp.
  *
  * @adap:	pointer to the cec adapter
  * @is_high:	when true the 5V pin is high, otherwise it is low
  * @ts:		the timestamp for this event
  *
  */
 void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts);

 /**
  * cec_get_edid_phys_addr() - find and return the physical address
  *
  * @edid:	pointer to the EDID data
  * @size:	size in bytes of the EDID data
  * @offset:	If not %NULL then the location of the physical address
  *		bytes in the EDID will be returned here. This is set to 0
  *		if there is no physical address found.
  *
  * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
  */
 u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
 			   unsigned int *offset);

 /**
  * cec_set_edid_phys_addr() - find and set the physical address
  *
  * @edid:	pointer to the EDID data
  * @size:	size in bytes of the EDID data
  * @phys_addr:	the new physical address
  *
  * This function finds the location of the physical address in the EDID
  * and fills in the given physical address and updates the checksum
  * at the end of the EDID block. It does nothing if the EDID doesn't
  * contain a physical address.
  */
 void cec_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);

 /**
  * cec_phys_addr_for_input() - calculate the PA for an input
  *
  * @phys_addr:	the physical address of the parent
  * @input:	the number of the input port, must be between 1 and 15
  *
  * This function calculates a new physical address based on the input
  * port number. For example:
  *
  * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
  *
  * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
  *
  * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
  *
  * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
  *
  * Return: the new physical address or CEC_PHYS_ADDR_INVALID.
  */
 u16 cec_phys_addr_for_input(u16 phys_addr, u8 input);

 /**
  * cec_phys_addr_validate() - validate a physical address from an EDID
  *
  * @phys_addr:	the physical address to validate
  * @parent:	if not %NULL, then this is filled with the parents PA.
  * @port:	if not %NULL, then this is filled with the input port.
  *
  * This validates a physical address as read from an EDID. If the
  * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
  * then it will return -EINVAL.
  *
  * The parent PA is passed into %parent and the input port is passed into
  * %port. For example:
  *
  * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
  *
  * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
  *
  * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
  *
  * PA = f.f.f.f: has parent f.f.f.f and input port 0.
  *
  * Return: 0 if the PA is valid, -EINVAL if not.
  */
 int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port);

 #else

 static inline int cec_register_adapter(struct cec_adapter *adap,
 				       struct device *parent)
 {
 	return 0;
 }

 static inline void cec_unregister_adapter(struct cec_adapter *adap)
 {
 }

 static inline void cec_delete_adapter(struct cec_adapter *adap)
 {
 }

 static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
 				   bool block)
 {
 }

 static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
 					     const struct edid *edid)
 {
 }

 static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
 					 unsigned int *offset)
 {
 	if (offset)
 		*offset = 0;
 	return CEC_PHYS_ADDR_INVALID;
 }

 static inline void cec_set_edid_phys_addr(u8 *edid, unsigned int size,
 					  u16 phys_addr)
 {
 }

 static inline u16 cec_phys_addr_for_input(u16 phys_addr, u8 input)
 {
 	return CEC_PHYS_ADDR_INVALID;
 }

 static inline int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
 {
 	if (parent)
 		*parent = phys_addr;
 	if (port)
 		*port = 0;
 	return 0;
 }

 #endif

 /**
  * cec_phys_addr_invalidate() - set the physical address to INVALID
  *
  * @adap:	the CEC adapter
  *
  * This is a simple helper function to invalidate the physical
  * address.
  */
 static inline void cec_phys_addr_invalidate(struct cec_adapter *adap)
 {
 	cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
 }

 /**
  * cec_get_edid_spa_location() - find location of the Source Physical Address
  *
  * @edid: the EDID
  * @size: the size of the EDID
  *
  * This EDID is expected to be a CEA-861 compliant, which means that there are
  * at least two blocks and one or more of the extensions blocks are CEA-861
  * blocks.
  *
  * The returned location is guaranteed to be <= size-2.
  *
  * This is an inline function since it is used by both CEC and V4L2.
  * Ideally this would go in a module shared by both, but it is overkill to do
  * that for just a single function.
  */
 static inline unsigned int cec_get_edid_spa_location(const u8 *edid,
 						     unsigned int size)
 {
 	unsigned int blocks = size / 128;
 	unsigned int block;
 	u8 d;

 	/* Sanity check: at least 2 blocks and a multiple of the block size */
 	if (blocks < 2 || size % 128)
 		return 0;

 	/*
 	 * If there are fewer extension blocks than the size, then update
 	 * 'blocks'. It is allowed to have more extension blocks than the size,
 	 * since some hardware can only read e.g. 256 bytes of the EDID, even
 	 * though more blocks are present. The first CEA-861 extension block
 	 * should normally be in block 1 anyway.
 	 */
 	if (edid[0x7e] + 1 < blocks)
 		blocks = edid[0x7e] + 1;

 	for (block = 1; block < blocks; block++) {
 		unsigned int offset = block * 128;

 		/* Skip any non-CEA-861 extension blocks */
 		if (edid[offset] != 0x02 || edid[offset + 1] != 0x03)
 			continue;

 		/* search Vendor Specific Data Block (tag 3) */
 		d = edid[offset + 2] & 0x7f;
 		/* Check if there are Data Blocks */
 		if (d <= 4)
 			continue;
 		if (d > 4) {
 			unsigned int i = offset + 4;
 			unsigned int end = offset + d;

 			/* Note: 'end' is always < 'size' */
 			do {
 				u8 tag = edid[i] >> 5;
 				u8 len = edid[i] & 0x1f;

 				if (tag == 3 && len >= 5 && i + len <= end &&
 				    edid[i + 1] == 0x03 &&
 				    edid[i + 2] == 0x0c &&
 				    edid[i + 3] == 0x00)
 					return i + 4;
 				i += len + 1;
 			} while (i < end);
 		}
 	}
 	return 0;
 }

 #endif /* _MEDIA_CEC_H */
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* cec - HDMI Consumer Electronics Control support header
	*
	* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
	*/

	#ifndef _MEDIA_CEC_H
	#define _MEDIA_CEC_H

	#include <linux/poll.h>
	#include <linux/fs.h>
	#include <linux/debugfs.h>
	#include <linux/device.h>
	#include <linux/cdev.h>
	#include <linux/kthread.h>
	#include <linux/timer.h>
	#include <linux/cec-funcs.h>
	#include <media/rc-core.h>
	#include <media/cec-notifier.h>

	#define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS \| CEC_CAP_TRANSMIT \| \
	CEC_CAP_PASSTHROUGH \| CEC_CAP_RC)

	/**
	* struct cec_devnode - cec device node
	* @dev: cec device
	* @cdev: cec character device
	* @minor: device node minor number
	* @registered: the device was correctly registered
	* @unregistered: the device was unregistered
	* @fhs_lock: lock to control access to the filehandle list
	* @fhs: the list of open filehandles (cec_fh)
	*
	* This structure represents a cec-related device node.
	*
	* The @parent is a physical device. It must be set by core or device drivers
	* before registering the node.
	*/
	struct cec_devnode {
	/* sysfs */
	struct device dev;
	struct cdev cdev;

	/* device info */
	int minor;
	bool registered;
	bool unregistered;
	struct list_head fhs;
	struct mutex lock;
	};

	struct cec_adapter;
	struct cec_data;
	struct cec_pin;

	struct cec_data {
	struct list_head list;
	struct list_head xfer_list;
	struct cec_adapter *adap;
	struct cec_msg msg;
	struct cec_fh *fh;
	struct delayed_work work;
	struct completion c;
	u8 attempts;
	bool blocking;
	bool completed;
	};

	struct cec_msg_entry {
	struct list_head list;
	struct cec_msg msg;
	};

	struct cec_event_entry {
	struct list_head list;
	struct cec_event ev;
	};

	#define CEC_NUM_CORE_EVENTS 2
	#define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH

	struct cec_fh {
	struct list_head list;
	struct list_head xfer_list;
	struct cec_adapter *adap;
	u8 mode_initiator;
	u8 mode_follower;

	/* Events */
	wait_queue_head_t wait;
	struct mutex lock;
	struct list_head events[CEC_NUM_EVENTS]; /* queued events */
	u16 queued_events[CEC_NUM_EVENTS];
	unsigned int total_queued_events;
	struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS];
	struct list_head msgs; /* queued messages */
	unsigned int queued_msgs;
	};

	#define CEC_SIGNAL_FREE_TIME_RETRY 3
	#define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5
	#define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7

	/* The nominal data bit period is 2.4 ms */
	#define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400)

	struct cec_adap_ops {
	/* Low-level callbacks */
	int (adap_enable)(struct cec_adapter adap, bool enable);
	int (adap_monitor_all_enable)(struct cec_adapter adap, bool enable);
	int (adap_monitor_pin_enable)(struct cec_adapter adap, bool enable);
	int (adap_log_addr)(struct cec_adapter adap, u8 logical_addr);
	int (adap_transmit)(struct cec_adapter adap, u8 attempts,
	u32 signal_free_time, struct cec_msg *msg);
	void (adap_status)(struct cec_adapter adap, struct seq_file *file);
	void (adap_free)(struct cec_adapter adap);

	/* Error injection callbacks */
	int (error_inj_show)(struct cec_adapter adap, struct seq_file *sf);
	bool (error_inj_parse_line)(struct cec_adapter adap, char *line);

	/* High-level CEC message callback */
	int (received)(struct cec_adapter adap, struct cec_msg *msg);
	};

	/*
	* The minimum message length you can receive (excepting poll messages) is 2.
	* With a transfer rate of at most 36 bytes per second this makes 18 messages
	* per second worst case.
	*
	* We queue at most 3 seconds worth of received messages. The CEC specification
	* requires that messages are replied to within a second, so 3 seconds should
	* give more than enough margin. Since most messages are actually more than 2
	* bytes, this is in practice a lot more than 3 seconds.
	*/
	#define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3)

	/*
	* The transmit queue is limited to 1 second worth of messages (worst case).
	* Messages can be transmitted by userspace and kernel space. But for both it
	* makes no sense to have a lot of messages queued up. One second seems
	* reasonable.
	*/
	#define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1)

	struct cec_adapter {
	struct module *owner;
	char name[32];
	struct cec_devnode devnode;
	struct mutex lock;
	struct rc_dev *rc;

	struct list_head transmit_queue;
	unsigned int transmit_queue_sz;
	struct list_head wait_queue;
	struct cec_data *transmitting;
	bool transmit_in_progress;

	struct task_struct *kthread_config;
	struct completion config_completion;

	struct task_struct *kthread;
	wait_queue_head_t kthread_waitq;
	wait_queue_head_t waitq;

	const struct cec_adap_ops *ops;
	void *priv;
	u32 capabilities;
	u8 available_log_addrs;

	u16 phys_addr;
	bool needs_hpd;
	bool is_configuring;
	bool is_configured;
	bool cec_pin_is_high;
	u8 last_initiator;
	u32 monitor_all_cnt;
	u32 monitor_pin_cnt;
	u32 follower_cnt;
	struct cec_fh *cec_follower;
	struct cec_fh *cec_initiator;
	bool passthrough;
	struct cec_log_addrs log_addrs;

	u32 tx_timeouts;

	#ifdef CONFIG_CEC_NOTIFIER
	struct cec_notifier *notifier;
	#endif
	#ifdef CONFIG_CEC_PIN
	struct cec_pin *pin;
	#endif

	struct dentry *cec_dir;
	struct dentry *status_file;
	struct dentry *error_inj_file;

	u16 phys_addrs[15];
	u32 sequence;

	char device_name[32];
	char input_phys[32];
	char input_drv[32];
	};

	static inline void cec_get_drvdata(const struct cec_adapter adap)
	{
	return adap->priv;
	}

	static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr)
	{
	return adap->log_addrs.log_addr_mask & (1 << log_addr);
	}

	static inline bool cec_is_sink(const struct cec_adapter *adap)
	{
	return adap->phys_addr == 0;
	}

	/**
	* cec_is_registered() - is the CEC adapter registered?
	*
	* @adap: the CEC adapter, may be NULL.
	*
	* Return: true if the adapter is registered, false otherwise.
	*/
	static inline bool cec_is_registered(const struct cec_adapter *adap)
	{
	return adap && adap->devnode.registered;
	}

	#define cec_phys_addr_exp(pa) \
	((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf

	struct edid;

	#if IS_REACHABLE(CONFIG_CEC_CORE)
	struct cec_adapter cec_allocate_adapter(const struct cec_adap_ops ops,
	void priv, const char name, u32 caps, u8 available_las);
	int cec_register_adapter(struct cec_adapter adap, struct device parent);
	void cec_unregister_adapter(struct cec_adapter *adap);
	void cec_delete_adapter(struct cec_adapter *adap);

	int cec_s_log_addrs(struct cec_adapter adap, struct cec_log_addrs log_addrs,
	bool block);
	void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
	bool block);
	void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
	const struct edid *edid);
	int cec_transmit_msg(struct cec_adapter adap, struct cec_msg msg,
	bool block);

	/* Called by the adapter */
	void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
	u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
	u8 error_cnt, ktime_t ts);

	static inline void cec_transmit_done(struct cec_adapter *adap, u8 status,
	u8 arb_lost_cnt, u8 nack_cnt,
	u8 low_drive_cnt, u8 error_cnt)
	{
	cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt,
	low_drive_cnt, error_cnt, ktime_get());
	}
	/*
	* Simplified version of cec_transmit_done for hardware that doesn't retry
	* failed transmits. So this is always just one attempt in which case
	* the status is sufficient.
	*/
	void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
	u8 status, ktime_t ts);

	static inline void cec_transmit_attempt_done(struct cec_adapter *adap,
	u8 status)
	{
	cec_transmit_attempt_done_ts(adap, status, ktime_get());
	}

	void cec_received_msg_ts(struct cec_adapter *adap,
	struct cec_msg *msg, ktime_t ts);

	static inline void cec_received_msg(struct cec_adapter *adap,
	struct cec_msg *msg)
	{
	cec_received_msg_ts(adap, msg, ktime_get());
	}

	/**
	* cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp.
	*
	* @adap: pointer to the cec adapter
	* @is_high: when true the CEC pin is high, otherwise it is low
	* @dropped_events: when true some events were dropped
	* @ts: the timestamp for this event
	*
	*/
	void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
	bool dropped_events, ktime_t ts);

	/**
	* cec_queue_pin_hpd_event() - queue a pin event with a given timestamp.
	*
	* @adap: pointer to the cec adapter
	* @is_high: when true the HPD pin is high, otherwise it is low
	* @ts: the timestamp for this event
	*
	*/
	void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);

	/**
	* cec_queue_pin_5v_event() - queue a pin event with a given timestamp.
	*
	* @adap: pointer to the cec adapter
	* @is_high: when true the 5V pin is high, otherwise it is low
	* @ts: the timestamp for this event
	*
	*/
	void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts);

	/**
	* cec_get_edid_phys_addr() - find and return the physical address
	*
	* @edid: pointer to the EDID data
	* @size: size in bytes of the EDID data
	* @offset: If not %NULL then the location of the physical address
	* bytes in the EDID will be returned here. This is set to 0
	* if there is no physical address found.
	*
	* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
	*/
	u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
	unsigned int *offset);

	/**
	* cec_set_edid_phys_addr() - find and set the physical address
	*
	* @edid: pointer to the EDID data
	* @size: size in bytes of the EDID data
	* @phys_addr: the new physical address
	*
	* This function finds the location of the physical address in the EDID
	* and fills in the given physical address and updates the checksum
	* at the end of the EDID block. It does nothing if the EDID doesn't
	* contain a physical address.
	*/
	void cec_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);

	/**
	* cec_phys_addr_for_input() - calculate the PA for an input
	*
	* @phys_addr: the physical address of the parent
	* @input: the number of the input port, must be between 1 and 15
	*
	* This function calculates a new physical address based on the input
	* port number. For example:
	*
	* PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
	*
	* PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
	*
	* PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
	*
	* PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
	*
	* Return: the new physical address or CEC_PHYS_ADDR_INVALID.
	*/
	u16 cec_phys_addr_for_input(u16 phys_addr, u8 input);

	/**
	* cec_phys_addr_validate() - validate a physical address from an EDID
	*
	* @phys_addr: the physical address to validate
	* @parent: if not %NULL, then this is filled with the parents PA.
	* @port: if not %NULL, then this is filled with the input port.
	*
	* This validates a physical address as read from an EDID. If the
	* PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
	* then it will return -EINVAL.
	*
	* The parent PA is passed into %parent and the input port is passed into
	* %port. For example:
	*
	* PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
	*
	* PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
	*
	* PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
	*
	* PA = f.f.f.f: has parent f.f.f.f and input port 0.
	*
	* Return: 0 if the PA is valid, -EINVAL if not.
	*/
	int cec_phys_addr_validate(u16 phys_addr, u16 parent, u16 port);

	#else

	static inline int cec_register_adapter(struct cec_adapter *adap,
	struct device *parent)
	{
	return 0;
	}

	static inline void cec_unregister_adapter(struct cec_adapter *adap)
	{
	}

	static inline void cec_delete_adapter(struct cec_adapter *adap)
	{
	}

	static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
	bool block)
	{
	}

	static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
	const struct edid *edid)
	{
	}

	static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
	unsigned int *offset)
	{
	if (offset)
	*offset = 0;
	return CEC_PHYS_ADDR_INVALID;
	}

	static inline void cec_set_edid_phys_addr(u8 *edid, unsigned int size,
	u16 phys_addr)
	{
	}

	static inline u16 cec_phys_addr_for_input(u16 phys_addr, u8 input)
	{
	return CEC_PHYS_ADDR_INVALID;
	}

	static inline int cec_phys_addr_validate(u16 phys_addr, u16 parent, u16 port)
	{
	if (parent)
	*parent = phys_addr;
	if (port)
	*port = 0;
	return 0;
	}

	#endif

	/**
	* cec_phys_addr_invalidate() - set the physical address to INVALID
	*
	* @adap: the CEC adapter
	*
	* This is a simple helper function to invalidate the physical
	* address.
	*/
	static inline void cec_phys_addr_invalidate(struct cec_adapter *adap)
	{
	cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
	}

	/**
	* cec_get_edid_spa_location() - find location of the Source Physical Address
	*
	* @edid: the EDID
	* @size: the size of the EDID
	*
	* This EDID is expected to be a CEA-861 compliant, which means that there are
	* at least two blocks and one or more of the extensions blocks are CEA-861
	* blocks.
	*
	* The returned location is guaranteed to be <= size-2.
	*
	* This is an inline function since it is used by both CEC and V4L2.
	* Ideally this would go in a module shared by both, but it is overkill to do
	* that for just a single function.
	*/
	static inline unsigned int cec_get_edid_spa_location(const u8 *edid,
	unsigned int size)
	{
	unsigned int blocks = size / 128;
	unsigned int block;
	u8 d;

	/* Sanity check: at least 2 blocks and a multiple of the block size */
	if (blocks < 2 \|\| size % 128)
	return 0;

	/*
	* If there are fewer extension blocks than the size, then update
	* 'blocks'. It is allowed to have more extension blocks than the size,
	* since some hardware can only read e.g. 256 bytes of the EDID, even
	* though more blocks are present. The first CEA-861 extension block
	* should normally be in block 1 anyway.
	*/
	if (edid[0x7e] + 1 < blocks)
	blocks = edid[0x7e] + 1;

	for (block = 1; block < blocks; block++) {
	unsigned int offset = block * 128;

	/* Skip any non-CEA-861 extension blocks */
	if (edid[offset] != 0x02 \|\| edid[offset + 1] != 0x03)
	continue;

	/* search Vendor Specific Data Block (tag 3) */
	d = edid[offset + 2] & 0x7f;
	/* Check if there are Data Blocks */
	if (d <= 4)
	continue;
	if (d > 4) {
	unsigned int i = offset + 4;
	unsigned int end = offset + d;

	/* Note: 'end' is always < 'size' */
	do {
	u8 tag = edid[i] >> 5;
	u8 len = edid[i] & 0x1f;

	if (tag == 3 && len >= 5 && i + len <= end &&
	edid[i + 1] == 0x03 &&
	edid[i + 2] == 0x0c &&
	edid[i + 3] == 0x00)
	return i + 4;
	i += len + 1;
	} while (i < end);
	}
	}
	return 0;
	}

	#endif /* _MEDIA_CEC_H */