242 lines
6.4 KiB
C
242 lines
6.4 KiB
C
/*
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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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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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-edid.h>
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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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* @parent: parent 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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struct device *parent;
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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_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 new_initiator;
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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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#define CEC_NUM_EVENTS CEC_EVENT_LOST_MSGS
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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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unsigned int pending_events;
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struct cec_event events[CEC_NUM_EVENTS];
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struct mutex lock;
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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_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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/* 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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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 is_configuring;
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bool is_configured;
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u32 monitor_all_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 dentry *cec_dir;
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struct dentry *status_file;
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u16 phys_addrs[15];
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u32 sequence;
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char input_name[32];
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char input_phys[32];
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char input_drv[32];
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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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#if IS_ENABLED(CONFIG_MEDIA_CEC)
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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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struct device *parent);
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int cec_register_adapter(struct cec_adapter *adap);
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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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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(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
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u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
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void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
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#else
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static inline int cec_register_adapter(struct cec_adapter *adap)
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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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#endif
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#endif /* _MEDIA_CEC_H */
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