545 lines
16 KiB
C
545 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* cec - HDMI Consumer Electronics Control support header
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*
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* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#ifndef _MEDIA_CEC_H
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#define _MEDIA_CEC_H
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#include <linux/poll.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/kthread.h>
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#include <linux/timer.h>
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#include <linux/cec-funcs.h>
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#include <media/rc-core.h>
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#define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | \
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CEC_CAP_PASSTHROUGH | CEC_CAP_RC)
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/**
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* struct cec_devnode - cec device node
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* @dev: cec device
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* @cdev: cec character device
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* @minor: device node minor number
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* @lock: lock to serialize open/release and registration
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* @registered: the device was correctly registered
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* @unregistered: the device was unregistered
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* @lock_fhs: lock to control access to @fhs
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* @fhs: the list of open filehandles (cec_fh)
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*
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* This structure represents a cec-related device node.
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*
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* To add or remove filehandles from @fhs the @lock must be taken first,
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* followed by @lock_fhs. It is safe to access @fhs if either lock is held.
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*
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* The @parent is a physical device. It must be set by core or device drivers
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* before registering the node.
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*/
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struct cec_devnode {
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/* sysfs */
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struct device dev;
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struct cdev cdev;
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/* device info */
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int minor;
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/* serialize open/release and registration */
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struct mutex lock;
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bool registered;
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bool unregistered;
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/* protect access to fhs */
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struct mutex lock_fhs;
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struct list_head fhs;
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};
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struct cec_adapter;
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struct cec_data;
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struct cec_pin;
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struct cec_notifier;
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struct cec_data {
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struct list_head list;
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struct list_head xfer_list;
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struct cec_adapter *adap;
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struct cec_msg msg;
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struct cec_fh *fh;
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struct delayed_work work;
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struct completion c;
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u8 attempts;
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bool blocking;
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bool completed;
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};
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struct cec_msg_entry {
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struct list_head list;
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struct cec_msg msg;
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};
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struct cec_event_entry {
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struct list_head list;
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struct cec_event ev;
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};
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#define CEC_NUM_CORE_EVENTS 2
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#define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH
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struct cec_fh {
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struct list_head list;
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struct list_head xfer_list;
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struct cec_adapter *adap;
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u8 mode_initiator;
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u8 mode_follower;
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/* Events */
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wait_queue_head_t wait;
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struct mutex lock;
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struct list_head events[CEC_NUM_EVENTS]; /* queued events */
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u16 queued_events[CEC_NUM_EVENTS];
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unsigned int total_queued_events;
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struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS];
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struct list_head msgs; /* queued messages */
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unsigned int queued_msgs;
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};
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#define CEC_SIGNAL_FREE_TIME_RETRY 3
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#define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5
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#define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7
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/* The nominal data bit period is 2.4 ms */
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#define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400)
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struct cec_adap_ops {
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/* Low-level callbacks */
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int (*adap_enable)(struct cec_adapter *adap, bool enable);
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int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
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int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable);
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int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
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void (*adap_configured)(struct cec_adapter *adap, bool configured);
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int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
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u32 signal_free_time, struct cec_msg *msg);
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void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
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void (*adap_free)(struct cec_adapter *adap);
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/* Error injection callbacks */
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int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf);
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bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line);
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/* High-level CEC message callback */
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int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
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};
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/*
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* The minimum message length you can receive (excepting poll messages) is 2.
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* With a transfer rate of at most 36 bytes per second this makes 18 messages
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* per second worst case.
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*
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* We queue at most 3 seconds worth of received messages. The CEC specification
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* requires that messages are replied to within a second, so 3 seconds should
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* give more than enough margin. Since most messages are actually more than 2
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* bytes, this is in practice a lot more than 3 seconds.
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*/
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#define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3)
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/*
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* The transmit queue is limited to 1 second worth of messages (worst case).
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* Messages can be transmitted by userspace and kernel space. But for both it
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* makes no sense to have a lot of messages queued up. One second seems
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* reasonable.
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*/
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#define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1)
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/**
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* struct cec_adapter - cec adapter structure
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* @owner: module owner
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* @name: name of the CEC adapter
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* @devnode: device node for the /dev/cecX device
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* @lock: mutex controlling access to this structure
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* @rc: remote control device
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* @transmit_queue: queue of pending transmits
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* @transmit_queue_sz: number of pending transmits
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* @wait_queue: queue of transmits waiting for a reply
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* @transmitting: CEC messages currently being transmitted
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* @transmit_in_progress: true if a transmit is in progress
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* @transmit_in_progress_aborted: true if a transmit is in progress is to be
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* aborted. This happens if the logical address is
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* invalidated while the transmit is ongoing. In that
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* case the transmit will finish, but will not retransmit
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* and be marked as ABORTED.
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* @xfer_timeout_ms: the transfer timeout in ms.
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* If 0, then timeout after 2.1 ms.
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* @kthread_config: kthread used to configure a CEC adapter
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* @config_completion: used to signal completion of the config kthread
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* @kthread: main CEC processing thread
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* @kthread_waitq: main CEC processing wait_queue
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* @ops: cec adapter ops
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* @priv: cec driver's private data
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* @capabilities: cec adapter capabilities
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* @available_log_addrs: maximum number of available logical addresses
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* @phys_addr: the current physical address
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* @needs_hpd: if true, then the HDMI HotPlug Detect pin must be high
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* in order to transmit or receive CEC messages. This is usually a HW
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* limitation.
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* @is_enabled: the CEC adapter is enabled
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* @is_configuring: the CEC adapter is configuring (i.e. claiming LAs)
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* @must_reconfigure: while configuring, the PA changed, so reclaim LAs
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* @is_configured: the CEC adapter is configured (i.e. has claimed LAs)
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* @cec_pin_is_high: if true then the CEC pin is high. Only used with the
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* CEC pin framework.
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* @adap_controls_phys_addr: if true, then the CEC adapter controls the
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* physical address, i.e. the CEC hardware can detect HPD changes and
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* read the EDID and is not dependent on an external HDMI driver.
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* Drivers that need this can set this field to true after the
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* cec_allocate_adapter() call.
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* @last_initiator: the initiator of the last transmitted message.
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* @monitor_all_cnt: number of filehandles monitoring all msgs
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* @monitor_pin_cnt: number of filehandles monitoring pin changes
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* @follower_cnt: number of filehandles in follower mode
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* @cec_follower: filehandle of the exclusive follower
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* @cec_initiator: filehandle of the exclusive initiator
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* @passthrough: if true, then the exclusive follower is in
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* passthrough mode.
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* @log_addrs: current logical addresses
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* @conn_info: current connector info
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* @tx_timeouts: number of transmit timeouts
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* @notifier: CEC notifier
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* @pin: CEC pin status struct
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* @cec_dir: debugfs cec directory
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* @status_file: debugfs cec status file
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* @error_inj_file: debugfs cec error injection file
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* @sequence: transmit sequence counter
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* @input_phys: remote control input_phys name
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*
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* This structure represents a cec adapter.
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*/
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struct cec_adapter {
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struct module *owner;
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char name[32];
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struct cec_devnode devnode;
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struct mutex lock;
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struct rc_dev *rc;
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struct list_head transmit_queue;
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unsigned int transmit_queue_sz;
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struct list_head wait_queue;
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struct cec_data *transmitting;
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bool transmit_in_progress;
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bool transmit_in_progress_aborted;
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unsigned int xfer_timeout_ms;
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struct task_struct *kthread_config;
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struct completion config_completion;
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struct task_struct *kthread;
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wait_queue_head_t kthread_waitq;
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const struct cec_adap_ops *ops;
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void *priv;
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u32 capabilities;
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u8 available_log_addrs;
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u16 phys_addr;
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bool needs_hpd;
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bool is_enabled;
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bool is_configuring;
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bool must_reconfigure;
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bool is_configured;
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bool cec_pin_is_high;
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bool adap_controls_phys_addr;
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u8 last_initiator;
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u32 monitor_all_cnt;
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u32 monitor_pin_cnt;
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u32 follower_cnt;
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struct cec_fh *cec_follower;
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struct cec_fh *cec_initiator;
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bool passthrough;
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struct cec_log_addrs log_addrs;
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struct cec_connector_info conn_info;
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u32 tx_timeouts;
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#ifdef CONFIG_CEC_NOTIFIER
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struct cec_notifier *notifier;
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#endif
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#ifdef CONFIG_CEC_PIN
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struct cec_pin *pin;
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#endif
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struct dentry *cec_dir;
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u32 sequence;
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char input_phys[32];
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};
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static inline void *cec_get_drvdata(const struct cec_adapter *adap)
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{
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return adap->priv;
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}
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static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr)
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{
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return adap->log_addrs.log_addr_mask & (1 << log_addr);
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}
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static inline bool cec_is_sink(const struct cec_adapter *adap)
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{
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return adap->phys_addr == 0;
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}
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/**
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* cec_is_registered() - is the CEC adapter registered?
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*
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* @adap: the CEC adapter, may be NULL.
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*
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* Return: true if the adapter is registered, false otherwise.
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*/
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static inline bool cec_is_registered(const struct cec_adapter *adap)
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{
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return adap && adap->devnode.registered;
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}
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#define cec_phys_addr_exp(pa) \
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((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf
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struct edid;
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struct drm_connector;
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#if IS_REACHABLE(CONFIG_CEC_CORE)
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struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
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void *priv, const char *name, u32 caps, u8 available_las);
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int cec_register_adapter(struct cec_adapter *adap, struct device *parent);
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void cec_unregister_adapter(struct cec_adapter *adap);
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void cec_delete_adapter(struct cec_adapter *adap);
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int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs,
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bool block);
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void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
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bool block);
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void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
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const struct edid *edid);
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void cec_s_conn_info(struct cec_adapter *adap,
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const struct cec_connector_info *conn_info);
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int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
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bool block);
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/* Called by the adapter */
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void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
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u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
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u8 error_cnt, ktime_t ts);
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static inline void cec_transmit_done(struct cec_adapter *adap, u8 status,
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u8 arb_lost_cnt, u8 nack_cnt,
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u8 low_drive_cnt, u8 error_cnt)
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{
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cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt,
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low_drive_cnt, error_cnt, ktime_get());
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}
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/*
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* Simplified version of cec_transmit_done for hardware that doesn't retry
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* failed transmits. So this is always just one attempt in which case
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* the status is sufficient.
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*/
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void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
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u8 status, ktime_t ts);
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static inline void cec_transmit_attempt_done(struct cec_adapter *adap,
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u8 status)
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{
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cec_transmit_attempt_done_ts(adap, status, ktime_get());
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}
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void cec_received_msg_ts(struct cec_adapter *adap,
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struct cec_msg *msg, ktime_t ts);
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static inline void cec_received_msg(struct cec_adapter *adap,
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struct cec_msg *msg)
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{
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cec_received_msg_ts(adap, msg, ktime_get());
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}
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/**
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* cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp.
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*
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* @adap: pointer to the cec adapter
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* @is_high: when true the CEC pin is high, otherwise it is low
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* @dropped_events: when true some events were dropped
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* @ts: the timestamp for this event
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*
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*/
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void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
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bool dropped_events, ktime_t ts);
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/**
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* cec_queue_pin_hpd_event() - queue a pin event with a given timestamp.
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*
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* @adap: pointer to the cec adapter
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* @is_high: when true the HPD pin is high, otherwise it is low
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* @ts: the timestamp for this event
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*
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*/
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void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
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/**
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* cec_queue_pin_5v_event() - queue a pin event with a given timestamp.
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*
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* @adap: pointer to the cec adapter
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* @is_high: when true the 5V pin is high, otherwise it is low
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* @ts: the timestamp for this event
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*
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*/
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void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
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/**
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* cec_get_edid_phys_addr() - find and return the physical address
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*
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* @edid: pointer to the EDID data
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* @size: size in bytes of the EDID data
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* @offset: If not %NULL then the location of the physical address
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* bytes in the EDID will be returned here. This is set to 0
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* if there is no physical address found.
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*
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* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
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*/
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u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
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unsigned int *offset);
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void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
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const struct drm_connector *connector);
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#else
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static inline int cec_register_adapter(struct cec_adapter *adap,
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struct device *parent)
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{
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return 0;
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}
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static inline void cec_unregister_adapter(struct cec_adapter *adap)
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{
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}
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static inline void cec_delete_adapter(struct cec_adapter *adap)
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{
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}
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static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
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bool block)
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{
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}
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static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
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const struct edid *edid)
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{
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}
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static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
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unsigned int *offset)
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{
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if (offset)
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*offset = 0;
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return CEC_PHYS_ADDR_INVALID;
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}
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static inline void cec_s_conn_info(struct cec_adapter *adap,
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const struct cec_connector_info *conn_info)
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{
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}
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static inline void
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cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
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const struct drm_connector *connector)
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{
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memset(conn_info, 0, sizeof(*conn_info));
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}
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#endif
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/**
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* cec_phys_addr_invalidate() - set the physical address to INVALID
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*
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* @adap: the CEC adapter
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*
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* This is a simple helper function to invalidate the physical
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* address.
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*/
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static inline void cec_phys_addr_invalidate(struct cec_adapter *adap)
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{
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cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
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}
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/**
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* cec_get_edid_spa_location() - find location of the Source Physical Address
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*
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* @edid: the EDID
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* @size: the size of the EDID
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*
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* This EDID is expected to be a CEA-861 compliant, which means that there are
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* at least two blocks and one or more of the extensions blocks are CEA-861
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* blocks.
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*
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* The returned location is guaranteed to be <= size-2.
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*
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* This is an inline function since it is used by both CEC and V4L2.
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* 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 */
|