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/* 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>
/* CEC_ADAP_G_CONNECTOR_INFO is available */
#define CEC_CAP_CONNECTOR_INFO (1 << 8)
#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_notifier;
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_drm_connector_info - tells which drm connector is
* associated with the CEC adapter.
* @card_no: drm card number
* @connector_id: drm connector ID
*/
struct cec_drm_connector_info {
__u32 card_no;
__u32 connector_id;
};
#define CEC_CONNECTOR_TYPE_NO_CONNECTOR 0
#define CEC_CONNECTOR_TYPE_DRM 1
/**
* struct cec_connector_info - tells if and which connector is
* associated with the CEC adapter.
* @type: connector type (if any)
* @drm: drm connector info
*/
struct cec_connector_info {
__u32 type;
union {
struct cec_drm_connector_info drm;
__u32 raw[16];
};
};
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;
bool transmit_in_progress_aborted;
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_claiming_log_addrs;
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;
struct cec_connector_info conn_info;
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;
struct drm_connector;
#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);
void cec_s_conn_info(struct cec_adapter *adap,
const struct cec_connector_info *conn_info);
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);
void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
const struct drm_connector *connector);
#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_s_conn_info(struct cec_adapter *adap,
const struct cec_connector_info *conn_info)
{
}
static inline void
cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
const struct drm_connector *connector)
{
memset(conn_info, 0, sizeof(*conn_info));
}
#endif
#if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
/**
* cec_notifier_register - register a callback with the notifier
* @n: the CEC notifier
* @adap: the CEC adapter, passed as argument to the callback function
* @callback: the callback function
*/
void cec_notifier_register(struct cec_notifier *n,
struct cec_adapter *adap,
void (*callback)(struct cec_adapter *adap, u16 pa));
/**
* cec_notifier_unregister - unregister the callback from the notifier.
* @n: the CEC notifier
*/
void cec_notifier_unregister(struct cec_notifier *n);
/**
* cec_register_cec_notifier - register the notifier with the cec adapter.
* @adap: the CEC adapter
* @notifier: the CEC notifier
*/
void cec_register_cec_notifier(struct cec_adapter *adap,
struct cec_notifier *notifier);
#else
static inline void
cec_notifier_register(struct cec_notifier *n,
struct cec_adapter *adap,
void (*callback)(struct cec_adapter *adap, u16 pa))
{
}
static inline void cec_notifier_unregister(struct cec_notifier *n)
{
}
static inline void cec_register_cec_notifier(struct cec_adapter *adap,
struct cec_notifier *notifier)
{
}
#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 */
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