454 lines
12 KiB
C
454 lines
12 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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#include <media/cec-notifier.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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* @registered: the device was correctly registered
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* @unregistered: the device was unregistered
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* @fhs_lock: lock to control access to the filehandle list
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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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* 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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bool registered;
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bool unregistered;
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struct list_head fhs;
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struct mutex lock;
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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_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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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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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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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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wait_queue_head_t 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_configuring;
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bool is_configured;
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bool cec_pin_is_high;
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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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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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struct dentry *status_file;
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struct dentry *error_inj_file;
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u16 phys_addrs[15];
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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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#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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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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#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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#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
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* that for just a single function.
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*/
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static inline unsigned int cec_get_edid_spa_location(const u8 *edid,
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unsigned int size)
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{
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unsigned int blocks = size / 128;
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unsigned int block;
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u8 d;
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/* Sanity check: at least 2 blocks and a multiple of the block size */
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if (blocks < 2 || size % 128)
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return 0;
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/*
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* If there are fewer extension blocks than the size, then update
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* 'blocks'. It is allowed to have more extension blocks than the size,
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* since some hardware can only read e.g. 256 bytes of the EDID, even
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* though more blocks are present. The first CEA-861 extension block
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* should normally be in block 1 anyway.
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*/
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if (edid[0x7e] + 1 < blocks)
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blocks = edid[0x7e] + 1;
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for (block = 1; block < blocks; block++) {
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unsigned int offset = block * 128;
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/* Skip any non-CEA-861 extension blocks */
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if (edid[offset] != 0x02 || edid[offset + 1] != 0x03)
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continue;
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/* search Vendor Specific Data Block (tag 3) */
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d = edid[offset + 2] & 0x7f;
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/* Check if there are Data Blocks */
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if (d <= 4)
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continue;
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if (d > 4) {
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unsigned int i = offset + 4;
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unsigned int end = offset + d;
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/* Note: 'end' is always < 'size' */
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do {
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u8 tag = edid[i] >> 5;
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u8 len = edid[i] & 0x1f;
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if (tag == 3 && len >= 5 && i + len <= end &&
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edid[i + 1] == 0x03 &&
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edid[i + 2] == 0x0c &&
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edid[i + 3] == 0x00)
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return i + 4;
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i += len + 1;
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} while (i < end);
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}
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}
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return 0;
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}
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#endif /* _MEDIA_CEC_H */
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