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All rights reserved. */ #ifndef _MEDIA_CEC_H #define _MEDIA_CEC_H #include #include #include #include #include #include #include #include #include /* CEC_ADAP_G_CONNECTOR_INFO is available */ #define CEC_CAP_CONNECTOR_INFO (1 << 8) #define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | \ CEC_CAP_PASSTHROUGH | CEC_CAP_RC) /** * struct cec_devnode - cec device node * @dev: cec device * @cdev: cec character device * @minor: device node minor number * @registered: the device was correctly registered * @unregistered: the device was unregistered * @fhs_lock: lock to control access to the filehandle list * @fhs: the list of open filehandles (cec_fh) * * This structure represents a cec-related device node. * * The @parent is a physical device. It must be set by core or device drivers * before registering the node. */ struct cec_devnode { /* sysfs */ struct device dev; struct cdev cdev; /* device info */ int minor; bool registered; bool unregistered; struct list_head fhs; struct mutex lock; }; struct cec_adapter; struct cec_data; struct cec_pin; struct cec_notifier; struct cec_data { struct list_head list; struct list_head xfer_list; struct cec_adapter *adap; struct cec_msg msg; struct cec_fh *fh; struct delayed_work work; struct completion c; u8 attempts; bool blocking; bool completed; }; struct cec_msg_entry { struct list_head list; struct cec_msg msg; }; struct cec_event_entry { struct list_head list; struct cec_event ev; }; #define CEC_NUM_CORE_EVENTS 2 #define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH struct cec_fh { struct list_head list; struct list_head xfer_list; struct cec_adapter *adap; u8 mode_initiator; u8 mode_follower; /* Events */ wait_queue_head_t wait; struct mutex lock; struct list_head events[CEC_NUM_EVENTS]; /* queued events */ u16 queued_events[CEC_NUM_EVENTS]; unsigned int total_queued_events; struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS]; struct list_head msgs; /* queued messages */ unsigned int queued_msgs; }; #define CEC_SIGNAL_FREE_TIME_RETRY 3 #define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5 #define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7 /* The nominal data bit period is 2.4 ms */ #define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400) struct cec_adap_ops { /* Low-level callbacks */ int (*adap_enable)(struct cec_adapter *adap, bool enable); int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable); int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable); int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr); int (*adap_transmit)(struct cec_adapter *adap, u8 attempts, u32 signal_free_time, struct cec_msg *msg); void (*adap_status)(struct cec_adapter *adap, struct seq_file *file); void (*adap_free)(struct cec_adapter *adap); /* Error injection callbacks */ int (*error_inj_show)(struct cec_adapter *adap, struct seq_file *sf); bool (*error_inj_parse_line)(struct cec_adapter *adap, char *line); /* High-level CEC message callback */ int (*received)(struct cec_adapter *adap, struct cec_msg *msg); }; /* * The minimum message length you can receive (excepting poll messages) is 2. * With a transfer rate of at most 36 bytes per second this makes 18 messages * per second worst case. * * We queue at most 3 seconds worth of received messages. The CEC specification * requires that messages are replied to within a second, so 3 seconds should * give more than enough margin. Since most messages are actually more than 2 * bytes, this is in practice a lot more than 3 seconds. */ #define CEC_MAX_MSG_RX_QUEUE_SZ (18 * 3) /* * The transmit queue is limited to 1 second worth of messages (worst case). * Messages can be transmitted by userspace and kernel space. But for both it * makes no sense to have a lot of messages queued up. One second seems * reasonable. */ #define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1) /** * struct cec_drm_connector_info - tells which drm connector is * associated with the CEC adapter. * @card_no: drm card number * @connector_id: drm connector ID */ struct cec_drm_connector_info { __u32 card_no; __u32 connector_id; }; #define CEC_CONNECTOR_TYPE_NO_CONNECTOR 0 #define CEC_CONNECTOR_TYPE_DRM 1 /** * struct cec_connector_info - tells if and which connector is * associated with the CEC adapter. * @type: connector type (if any) * @drm: drm connector info */ struct cec_connector_info { __u32 type; union { struct cec_drm_connector_info drm; __u32 raw[16]; }; }; struct cec_adapter { struct module *owner; char name[32]; struct cec_devnode devnode; struct mutex lock; struct rc_dev *rc; struct list_head transmit_queue; unsigned int transmit_queue_sz; struct list_head wait_queue; struct cec_data *transmitting; bool transmit_in_progress; struct task_struct *kthread_config; struct completion config_completion; struct task_struct *kthread; wait_queue_head_t kthread_waitq; wait_queue_head_t waitq; const struct cec_adap_ops *ops; void *priv; u32 capabilities; u8 available_log_addrs; u16 phys_addr; bool needs_hpd; bool is_configuring; bool is_configured; bool cec_pin_is_high; u8 last_initiator; u32 monitor_all_cnt; u32 monitor_pin_cnt; u32 follower_cnt; struct cec_fh *cec_follower; struct cec_fh *cec_initiator; bool passthrough; struct cec_log_addrs log_addrs; struct cec_connector_info conn_info; u32 tx_timeouts; #ifdef CONFIG_CEC_NOTIFIER struct cec_notifier *notifier; #endif #ifdef CONFIG_CEC_PIN struct cec_pin *pin; #endif struct dentry *cec_dir; struct dentry *status_file; struct dentry *error_inj_file; u16 phys_addrs[15]; u32 sequence; char input_phys[32]; }; static inline void *cec_get_drvdata(const struct cec_adapter *adap) { return adap->priv; } static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr) { return adap->log_addrs.log_addr_mask & (1 << log_addr); } static inline bool cec_is_sink(const struct cec_adapter *adap) { return adap->phys_addr == 0; } /** * cec_is_registered() - is the CEC adapter registered? * * @adap: the CEC adapter, may be NULL. * * Return: true if the adapter is registered, false otherwise. */ static inline bool cec_is_registered(const struct cec_adapter *adap) { return adap && adap->devnode.registered; } #define cec_phys_addr_exp(pa) \ ((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf struct edid; struct drm_connector; #if IS_REACHABLE(CONFIG_CEC_CORE) struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, void *priv, const char *name, u32 caps, u8 available_las); int cec_register_adapter(struct cec_adapter *adap, struct device *parent); void cec_unregister_adapter(struct cec_adapter *adap); void cec_delete_adapter(struct cec_adapter *adap); int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs, bool block); void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block); void cec_s_phys_addr_from_edid(struct cec_adapter *adap, const struct edid *edid); void cec_s_conn_info(struct cec_adapter *adap, const struct cec_connector_info *conn_info); int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg, bool block); /* Called by the adapter */ void cec_transmit_done_ts(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt, ktime_t ts); static inline void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt) { cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt, low_drive_cnt, error_cnt, ktime_get()); } /* * Simplified version of cec_transmit_done for hardware that doesn't retry * failed transmits. So this is always just one attempt in which case * the status is sufficient. */ void cec_transmit_attempt_done_ts(struct cec_adapter *adap, u8 status, ktime_t ts); static inline void cec_transmit_attempt_done(struct cec_adapter *adap, u8 status) { cec_transmit_attempt_done_ts(adap, status, ktime_get()); } void cec_received_msg_ts(struct cec_adapter *adap, struct cec_msg *msg, ktime_t ts); static inline void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg) { cec_received_msg_ts(adap, msg, ktime_get()); } /** * cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp. * * @adap: pointer to the cec adapter * @is_high: when true the CEC pin is high, otherwise it is low * @dropped_events: when true some events were dropped * @ts: the timestamp for this event * */ void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high, bool dropped_events, ktime_t ts); /** * cec_queue_pin_hpd_event() - queue a pin event with a given timestamp. * * @adap: pointer to the cec adapter * @is_high: when true the HPD pin is high, otherwise it is low * @ts: the timestamp for this event * */ void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts); /** * cec_queue_pin_5v_event() - queue a pin event with a given timestamp. * * @adap: pointer to the cec adapter * @is_high: when true the 5V pin is high, otherwise it is low * @ts: the timestamp for this event * */ void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts); /** * cec_get_edid_phys_addr() - find and return the physical address * * @edid: pointer to the EDID data * @size: size in bytes of the EDID data * @offset: If not %NULL then the location of the physical address * bytes in the EDID will be returned here. This is set to 0 * if there is no physical address found. * * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none. */ u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, unsigned int *offset); void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info, const struct drm_connector *connector); #else static inline int cec_register_adapter(struct cec_adapter *adap, struct device *parent) { return 0; } static inline void cec_unregister_adapter(struct cec_adapter *adap) { } static inline void cec_delete_adapter(struct cec_adapter *adap) { } static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block) { } static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap, const struct edid *edid) { } static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, unsigned int *offset) { if (offset) *offset = 0; return CEC_PHYS_ADDR_INVALID; } static inline void cec_s_conn_info(struct cec_adapter *adap, const struct cec_connector_info *conn_info) { } static inline void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info, const struct drm_connector *connector) { memset(conn_info, 0, sizeof(*conn_info)); } #endif #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER) /** * cec_notifier_register - register a callback with the notifier * @n: the CEC notifier * @adap: the CEC adapter, passed as argument to the callback function * @callback: the callback function */ void cec_notifier_register(struct cec_notifier *n, struct cec_adapter *adap, void (*callback)(struct cec_adapter *adap, u16 pa)); /** * cec_notifier_unregister - unregister the callback from the notifier. * @n: the CEC notifier */ void cec_notifier_unregister(struct cec_notifier *n); /** * cec_register_cec_notifier - register the notifier with the cec adapter. * @adap: the CEC adapter * @notifier: the CEC notifier */ void cec_register_cec_notifier(struct cec_adapter *adap, struct cec_notifier *notifier); #else static inline void cec_notifier_register(struct cec_notifier *n, struct cec_adapter *adap, void (*callback)(struct cec_adapter *adap, u16 pa)) { } static inline void cec_notifier_unregister(struct cec_notifier *n) { } static inline void cec_register_cec_notifier(struct cec_adapter *adap, struct cec_notifier *notifier) { } #endif /** * cec_phys_addr_invalidate() - set the physical address to INVALID * * @adap: the CEC adapter * * This is a simple helper function to invalidate the physical * address. */ static inline void cec_phys_addr_invalidate(struct cec_adapter *adap) { cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false); } /** * cec_get_edid_spa_location() - find location of the Source Physical Address * * @edid: the EDID * @size: the size of the EDID * * This EDID is expected to be a CEA-861 compliant, which means that there are * at least two blocks and one or more of the extensions blocks are CEA-861 * blocks. * * The returned location is guaranteed to be <= size-2. * * This is an inline function since it is used by both CEC and V4L2. * Ideally this would go in a module shared by both, but it is overkill to do * that for just a single function. */ static inline unsigned int cec_get_edid_spa_location(const u8 *edid, unsigned int size) { unsigned int blocks = size / 128; unsigned int block; u8 d; /* Sanity check: at least 2 blocks and a multiple of the block size */ if (blocks < 2 || size % 128) return 0; /* * If there are fewer extension blocks than the size, then update * 'blocks'. It is allowed to have more extension blocks than the size, * since some hardware can only read e.g. 256 bytes of the EDID, even * though more blocks are present. The first CEA-861 extension block * should normally be in block 1 anyway. */ if (edid[0x7e] + 1 < blocks) blocks = edid[0x7e] + 1; for (block = 1; block < blocks; block++) { unsigned int offset = block * 128; /* Skip any non-CEA-861 extension blocks */ if (edid[offset] != 0x02 || edid[offset + 1] != 0x03) continue; /* search Vendor Specific Data Block (tag 3) */ d = edid[offset + 2] & 0x7f; /* Check if there are Data Blocks */ if (d <= 4) continue; if (d > 4) { unsigned int i = offset + 4; unsigned int end = offset + d; /* Note: 'end' is always < 'size' */ do { u8 tag = edid[i] >> 5; u8 len = edid[i] & 0x1f; if (tag == 3 && len >= 5 && i + len <= end && edid[i + 1] == 0x03 && edid[i + 2] == 0x0c && edid[i + 3] == 0x00) return i + 4; i += len + 1; } while (i < end); } } return 0; } #endif /* _MEDIA_CEC_H */