[mirror_ubuntu-eoan-kernel.git] / include / 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;

	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 input_phys[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);

#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;
}

#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 */
Commit	Line	Data
ab15d248	1	/* SPDX-License-Identifier: GPL-2.0-only */
a56960e8 HV	2	/*
	3	* cec - HDMI Consumer Electronics Control support header
	4	*
	5	* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
a56960e8 HV	6	*/
	7
	8	#ifndef _MEDIA_CEC_H
	9	#define _MEDIA_CEC_H
	10
	11	#include <linux/poll.h>
	12	#include <linux/fs.h>
	13	#include <linux/debugfs.h>
	14	#include <linux/device.h>
	15	#include <linux/cdev.h>
	16	#include <linux/kthread.h>
	17	#include <linux/timer.h>
	18	#include <linux/cec-funcs.h>
	19	#include <media/rc-core.h>
e3a93adc	20	#include <media/cec-notifier.h>
a56960e8	21
ee0c503e HV	22	#define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS \| CEC_CAP_TRANSMIT \| \
	23	CEC_CAP_PASSTHROUGH \| CEC_CAP_RC)
	24
a56960e8 HV	25	/**
	26	* struct cec_devnode - cec device node
	27	* @dev: cec device
	28	* @cdev: cec character device
a56960e8 HV	29	* @minor: device node minor number
	30	* @registered: the device was correctly registered
	31	* @unregistered: the device was unregistered
	32	* @fhs_lock: lock to control access to the filehandle list
	33	* @fhs: the list of open filehandles (cec_fh)
	34	*
	35	* This structure represents a cec-related device node.
	36	*
	37	* The @parent is a physical device. It must be set by core or device drivers
	38	* before registering the node.
	39	*/
	40	struct cec_devnode {
	41	/* sysfs */
	42	struct device dev;
	43	struct cdev cdev;
a56960e8 HV	44
	45	/* device info */
	46	int minor;
	47	bool registered;
	48	bool unregistered;
a56960e8	49	struct list_head fhs;
62148f09	50	struct mutex lock;
a56960e8 HV	51	};
	52
	53	struct cec_adapter;
	54	struct cec_data;
ea5c8ef2	55	struct cec_pin;
a56960e8 HV	56
	57	struct cec_data {
	58	struct list_head list;
	59	struct list_head xfer_list;
	60	struct cec_adapter *adap;
	61	struct cec_msg msg;
	62	struct cec_fh *fh;
	63	struct delayed_work work;
	64	struct completion c;
	65	u8 attempts;
a56960e8 HV	66	bool blocking;
	67	bool completed;
	68	};
	69
	70	struct cec_msg_entry {
	71	struct list_head list;
	72	struct cec_msg msg;
	73	};
	74
6b2bbb08 HV	75	struct cec_event_entry {
	76	struct list_head list;
	77	struct cec_event ev;
	78	};
	79
	80	#define CEC_NUM_CORE_EVENTS 2
4786b0d6	81	#define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH
a56960e8 HV	82
	83	struct cec_fh {
	84	struct list_head list;
	85	struct list_head xfer_list;
	86	struct cec_adapter *adap;
	87	u8 mode_initiator;
	88	u8 mode_follower;
	89
	90	/* Events */
	91	wait_queue_head_t wait;
a56960e8	92	struct mutex lock;
6b2bbb08	93	struct list_head events[CEC_NUM_EVENTS]; /* queued events */
6ec1cbf6	94	u16 queued_events[CEC_NUM_EVENTS];
6b2bbb08 HV	95	unsigned int total_queued_events;
6b2bbb08 HV	96	struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS];
a56960e8 HV	97	struct list_head msgs; /* queued messages */
	98	unsigned int queued_msgs;
	99	};
	100
	101	#define CEC_SIGNAL_FREE_TIME_RETRY 3
	102	#define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5
	103	#define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7
	104
	105	/* The nominal data bit period is 2.4 ms */
	106	#define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400)
	107
	108	struct cec_adap_ops {
	109	/* Low-level callbacks */
	110	int (adap_enable)(struct cec_adapter adap, bool enable);
	111	int (adap_monitor_all_enable)(struct cec_adapter adap, bool enable);
48ea2e92	112	int (adap_monitor_pin_enable)(struct cec_adapter adap, bool enable);
a56960e8 HV	113	int (adap_log_addr)(struct cec_adapter adap, u8 logical_addr);
	114	int (adap_transmit)(struct cec_adapter adap, u8 attempts,
	115	u32 signal_free_time, struct cec_msg *msg);
	116	void (adap_status)(struct cec_adapter adap, struct seq_file *file);
e6259b5f	117	void (adap_free)(struct cec_adapter adap);
a56960e8	118
9ca400c1 HV	119	/* Error injection callbacks */
	120	int (error_inj_show)(struct cec_adapter adap, struct seq_file *sf);
	121	bool (error_inj_parse_line)(struct cec_adapter adap, char *line);
	122
a56960e8 HV	123	/* High-level CEC message callback */
	124	int (received)(struct cec_adapter adap, struct cec_msg *msg);
	125	};
	126
	127	/*
	128	* The minimum message length you can receive (excepting poll messages) is 2.
	129	* With a transfer rate of at most 36 bytes per second this makes 18 messages
	130	* per second worst case.
	131	*
11065f85 HV	132	* We queue at most 3 seconds worth of received messages. The CEC specification
	133	* requires that messages are replied to within a second, so 3 seconds should
	134	* give more than enough margin. Since most messages are actually more than 2
	135	* bytes, this is in practice a lot more than 3 seconds.
a56960e8	136	*/
11065f85 HV	137	#define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3)
	138
	139	/*
	140	* The transmit queue is limited to 1 second worth of messages (worst case).
	141	* Messages can be transmitted by userspace and kernel space. But for both it
	142	* makes no sense to have a lot of messages queued up. One second seems
	143	* reasonable.
	144	*/
	145	#define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1)
a56960e8 HV	146
	147	struct cec_adapter {
	148	struct module *owner;
	149	char name[32];
	150	struct cec_devnode devnode;
	151	struct mutex lock;
	152	struct rc_dev *rc;
	153
	154	struct list_head transmit_queue;
11065f85	155	unsigned int transmit_queue_sz;
a56960e8 HV	156	struct list_head wait_queue;
	157	struct cec_data *transmitting;
	158
	159	struct task_struct *kthread_config;
	160	struct completion config_completion;
	161
	162	struct task_struct *kthread;
	163	wait_queue_head_t kthread_waitq;
	164	wait_queue_head_t waitq;
	165
	166	const struct cec_adap_ops *ops;
	167	void *priv;
	168	u32 capabilities;
	169	u8 available_log_addrs;
	170
	171	u16 phys_addr;
f902c1e9	172	bool needs_hpd;
a56960e8 HV	173	bool is_configuring;
a56960e8 HV	174	bool is_configured;
28e11b15	175	bool cec_pin_is_high;
7d867a1b	176	u8 last_initiator;
a56960e8	177	u32 monitor_all_cnt;
b8d62f50	178	u32 monitor_pin_cnt;
a56960e8 HV	179	u32 follower_cnt;
	180	struct cec_fh *cec_follower;
	181	struct cec_fh *cec_initiator;
	182	bool passthrough;
	183	struct cec_log_addrs log_addrs;
	184
bb789e03 HV	185	u32 tx_timeouts;
bb789e03 HV	186
e94c3281	187	#ifdef CONFIG_CEC_NOTIFIER
e3a93adc HV	188	struct cec_notifier *notifier;
e3a93adc HV	189	#endif
ea5c8ef2 HV	190	#ifdef CONFIG_CEC_PIN
	191	struct cec_pin *pin;
	192	#endif
e3a93adc	193
a56960e8 HV	194	struct dentry *cec_dir;
a56960e8 HV	195	struct dentry *status_file;
9ca400c1	196	struct dentry *error_inj_file;
a56960e8 HV	197
	198	u16 phys_addrs[15];
	199	u32 sequence;
	200
a56960e8	201	char input_phys[32];
a56960e8 HV	202	};
a56960e8 HV	203
0b0b97dc JA	204	static inline void cec_get_drvdata(const struct cec_adapter adap)
	205	{
	206	return adap->priv;
	207	}
	208
a56960e8 HV	209	static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr)
	210	{
	211	return adap->log_addrs.log_addr_mask & (1 << log_addr);
	212	}
	213
	214	static inline bool cec_is_sink(const struct cec_adapter *adap)
	215	{
	216	return adap->phys_addr == 0;
	217	}
	218
c8959a39 HV	219	/**
	220	* cec_is_registered() - is the CEC adapter registered?
	221	*
	222	* @adap: the CEC adapter, may be NULL.
	223	*
	224	* Return: true if the adapter is registered, false otherwise.
	225	*/
	226	static inline bool cec_is_registered(const struct cec_adapter *adap)
	227	{
	228	return adap && adap->devnode.registered;
	229	}
	230
ee7e9871 HV	231	#define cec_phys_addr_exp(pa) \
	232	((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf
	233
23111ec3 HV	234	struct edid;
23111ec3 HV	235
f9f314f3	236	#if IS_REACHABLE(CONFIG_CEC_CORE)
a56960e8	237	struct cec_adapter cec_allocate_adapter(const struct cec_adap_ops ops,
f51e8080 HV	238	void priv, const char name, u32 caps, u8 available_las);
f51e8080 HV	239	int cec_register_adapter(struct cec_adapter adap, struct device parent);
a56960e8 HV	240	void cec_unregister_adapter(struct cec_adapter *adap);
	241	void cec_delete_adapter(struct cec_adapter *adap);
	242
	243	int cec_s_log_addrs(struct cec_adapter adap, struct cec_log_addrs log_addrs,
	244	bool block);
	245	void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
	246	bool block);
23111ec3 HV	247	void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
23111ec3 HV	248	const struct edid *edid);
a56960e8 HV	249	int cec_transmit_msg(struct cec_adapter adap, struct cec_msg msg,
	250	bool block);
	251
	252	/* Called by the adapter */
0861ad14 HV	253	void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
	254	u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
	255	u8 error_cnt, ktime_t ts);
	256
	257	static inline void cec_transmit_done(struct cec_adapter *adap, u8 status,
	258	u8 arb_lost_cnt, u8 nack_cnt,
	259	u8 low_drive_cnt, u8 error_cnt)
	260	{
	261	cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt,
	262	low_drive_cnt, error_cnt, ktime_get());
	263	}
c94cdc1e HV	264	/*
	265	* Simplified version of cec_transmit_done for hardware that doesn't retry
	266	* failed transmits. So this is always just one attempt in which case
	267	* the status is sufficient.
	268	*/
0861ad14 HV	269	void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
	270	u8 status, ktime_t ts);
	271
	272	static inline void cec_transmit_attempt_done(struct cec_adapter *adap,
	273	u8 status)
	274	{
	275	cec_transmit_attempt_done_ts(adap, status, ktime_get());
	276	}
	277
	278	void cec_received_msg_ts(struct cec_adapter *adap,
	279	struct cec_msg *msg, ktime_t ts);
	280
	281	static inline void cec_received_msg(struct cec_adapter *adap,
	282	struct cec_msg *msg)
	283	{
	284	cec_received_msg_ts(adap, msg, ktime_get());
	285	}
a56960e8	286
b8d62f50	287	/**
9a6b2a87	288	* cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp.
b8d62f50 HV	289	*
b8d62f50 HV	290	* @adap: pointer to the cec adapter
9a6b2a87	291	* @is_high: when true the CEC pin is high, otherwise it is low
6ec1cbf6	292	* @dropped_events: when true some events were dropped
b8d62f50 HV	293	* @ts: the timestamp for this event
	294	*
	295	*/
6ec1cbf6 HV	296	void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
6ec1cbf6 HV	297	bool dropped_events, ktime_t ts);
b8d62f50	298
333ef6bd HV	299	/**
	300	* cec_queue_pin_hpd_event() - queue a pin event with a given timestamp.
	301	*
	302	* @adap: pointer to the cec adapter
	303	* @is_high: when true the HPD pin is high, otherwise it is low
	304	* @ts: the timestamp for this event
	305	*
	306	*/
	307	void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
	308
4786b0d6 HV	309	/**
	310	* cec_queue_pin_5v_event() - queue a pin event with a given timestamp.
	311	*
	312	* @adap: pointer to the cec adapter
	313	* @is_high: when true the 5V pin is high, otherwise it is low
	314	* @ts: the timestamp for this event
	315	*
	316	*/
	317	void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
	318
ee7e9871 HV	319	/**
	320	* cec_get_edid_phys_addr() - find and return the physical address
	321	*
	322	* @edid: pointer to the EDID data
	323	* @size: size in bytes of the EDID data
	324	* @offset: If not %NULL then the location of the physical address
	325	* bytes in the EDID will be returned here. This is set to 0
	326	* if there is no physical address found.
	327	*
	328	* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
	329	*/
	330	u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
	331	unsigned int *offset);
	332
a56960e8 HV	333	#else
a56960e8 HV	334
f51e8080 HV	335	static inline int cec_register_adapter(struct cec_adapter *adap,
f51e8080 HV	336	struct device *parent)
a56960e8 HV	337	{
	338	return 0;
	339	}
	340
	341	static inline void cec_unregister_adapter(struct cec_adapter *adap)
	342	{
	343	}
	344
	345	static inline void cec_delete_adapter(struct cec_adapter *adap)
	346	{
	347	}
	348
	349	static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
	350	bool block)
	351	{
	352	}
	353
23111ec3 HV	354	static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
	355	const struct edid *edid)
	356	{
	357	}
	358
ee7e9871 HV	359	static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
	360	unsigned int *offset)
	361	{
	362	if (offset)
	363	*offset = 0;
	364	return CEC_PHYS_ADDR_INVALID;
	365	}
	366
a56960e8 HV	367	#endif
a56960e8 HV	368
13532789 HV	369	/**
	370	* cec_phys_addr_invalidate() - set the physical address to INVALID
	371	*
	372	* @adap: the CEC adapter
	373	*
	374	* This is a simple helper function to invalidate the physical
	375	* address.
	376	*/
	377	static inline void cec_phys_addr_invalidate(struct cec_adapter *adap)
	378	{
	379	cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
	380	}
	381
b915bf57 HV	382	/**
	383	* cec_get_edid_spa_location() - find location of the Source Physical Address
	384	*
	385	* @edid: the EDID
	386	* @size: the size of the EDID
	387	*
	388	* This EDID is expected to be a CEA-861 compliant, which means that there are
	389	* at least two blocks and one or more of the extensions blocks are CEA-861
	390	* blocks.
	391	*
	392	* The returned location is guaranteed to be <= size-2.
	393	*
	394	* This is an inline function since it is used by both CEC and V4L2.
	395	* Ideally this would go in a module shared by both, but it is overkill to do
	396	* that for just a single function.
	397	*/
	398	static inline unsigned int cec_get_edid_spa_location(const u8 *edid,
	399	unsigned int size)
	400	{
	401	unsigned int blocks = size / 128;
	402	unsigned int block;
	403	u8 d;
	404
	405	/* Sanity check: at least 2 blocks and a multiple of the block size */
	406	if (blocks < 2 \|\| size % 128)
	407	return 0;
	408
	409	/*
	410	* If there are fewer extension blocks than the size, then update
	411	* 'blocks'. It is allowed to have more extension blocks than the size,
	412	* since some hardware can only read e.g. 256 bytes of the EDID, even
	413	* though more blocks are present. The first CEA-861 extension block
	414	* should normally be in block 1 anyway.
	415	*/
	416	if (edid[0x7e] + 1 < blocks)
	417	blocks = edid[0x7e] + 1;
	418
	419	for (block = 1; block < blocks; block++) {
	420	unsigned int offset = block * 128;
	421
	422	/* Skip any non-CEA-861 extension blocks */
	423	if (edid[offset] != 0x02 \|\| edid[offset + 1] != 0x03)
	424	continue;
	425
	426	/* search Vendor Specific Data Block (tag 3) */
	427	d = edid[offset + 2] & 0x7f;
	428	/* Check if there are Data Blocks */
	429	if (d <= 4)
	430	continue;
	431	if (d > 4) {
	432	unsigned int i = offset + 4;
	433	unsigned int end = offset + d;
	434
	435	/* Note: 'end' is always < 'size' */
	436	do {
	437	u8 tag = edid[i] >> 5;
	438	u8 len = edid[i] & 0x1f;
	439
	440	if (tag == 3 && len >= 5 && i + len <= end &&
	441	edid[i + 1] == 0x03 &&
	442	edid[i + 2] == 0x0c &&
	443	edid[i + 3] == 0x00)
	444	return i + 4;
	445	i += len + 1;
446	} while (i < end);
447	}
448	}
449	return 0;
450	}
451
a56960e8	452	#endif /* _MEDIA_CEC_H */