/* * cec - HDMI Consumer Electronics Control support header * * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. * * This program is free software; you may redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef _MEDIA_CEC_H #define _MEDIA_CEC_H #include #include #include #include #include #include #include #include #include #include /** * struct cec_devnode - cec device node * @dev: cec device * @cdev: cec character device * @parent: parent 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; struct device *parent; /* device info */ int minor; bool registered; bool unregistered; struct list_head fhs; struct mutex lock; }; struct cec_adapter; struct cec_data; 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 new_initiator; bool blocking; bool completed; }; struct cec_msg_entry { struct list_head list; struct cec_msg msg; }; #define CEC_NUM_EVENTS CEC_EVENT_LOST_MSGS 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; unsigned int pending_events; struct cec_event events[CEC_NUM_EVENTS]; struct mutex lock; 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_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); /* High-level CEC message callback */ int (*received)(struct cec_adapter *adap, struct cec_msg *msg); }; /* * The minimum message length you can receive (excepting poll messages) is 2. * With a transfer rate of at most 36 bytes per second this makes 18 messages * per second worst case. * * We queue at most 3 seconds worth of received messages. The CEC specification * requires that messages are replied to within a second, so 3 seconds should * give more than enough margin. Since most messages are actually more than 2 * bytes, this is in practice a lot more than 3 seconds. */ #define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3) /* * The transmit queue is limited to 1 second worth of messages (worst case). * Messages can be transmitted by userspace and kernel space. But for both it * makes no sense to have a lot of messages queued up. One second seems * reasonable. */ #define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1) struct cec_adapter { struct module *owner; char name[32]; struct cec_devnode devnode; struct mutex lock; struct rc_dev *rc; struct list_head transmit_queue; unsigned int transmit_queue_sz; struct list_head wait_queue; struct cec_data *transmitting; struct task_struct *kthread_config; struct completion config_completion; struct task_struct *kthread; wait_queue_head_t kthread_waitq; wait_queue_head_t waitq; const struct cec_adap_ops *ops; void *priv; u32 capabilities; u8 available_log_addrs; u16 phys_addr; bool is_configuring; bool is_configured; u32 monitor_all_cnt; u32 follower_cnt; struct cec_fh *cec_follower; struct cec_fh *cec_initiator; bool passthrough; struct cec_log_addrs log_addrs; struct dentry *cec_dir; struct dentry *status_file; u16 phys_addrs[15]; u32 sequence; char input_name[32]; char input_phys[32]; char input_drv[32]; }; 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; } #if IS_ENABLED(CONFIG_MEDIA_CEC) struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, void *priv, const char *name, u32 caps, u8 available_las, struct device *parent); int cec_register_adapter(struct cec_adapter *adap); 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); int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, bool block); /* Called by the adapter */ void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt); void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg); #else static inline int cec_register_adapter(struct cec_adapter *adap) { 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) { } #endif #endif /* _MEDIA_CEC_H */