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166 lines
5.0 KiB
166 lines
5.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* cec-notifier.h - notify CEC drivers of physical address changes |
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* |
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* Copyright 2016 Russell King. |
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* Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
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*/ |
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#ifndef LINUX_CEC_NOTIFIER_H |
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#define LINUX_CEC_NOTIFIER_H |
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#include <linux/err.h> |
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#include <media/cec.h> |
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struct device; |
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struct edid; |
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struct cec_adapter; |
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struct cec_notifier; |
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#if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER) |
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/** |
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* cec_notifier_conn_register - find or create a new cec_notifier for the given |
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* HDMI device and connector tuple. |
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* @hdmi_dev: HDMI device that sends the events. |
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* @port_name: the connector name from which the event occurs. May be NULL |
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* if there is always only one HDMI connector created by the HDMI device. |
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* @conn_info: the connector info from which the event occurs (may be NULL) |
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* |
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* If a notifier for device @dev and connector @port_name already exists, then |
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* increase the refcount and return that notifier. |
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* |
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* If it doesn't exist, then allocate a new notifier struct and return a |
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* pointer to that new struct. |
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* |
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* Return NULL if the memory could not be allocated. |
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*/ |
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struct cec_notifier * |
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cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name, |
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const struct cec_connector_info *conn_info); |
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/** |
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* cec_notifier_conn_unregister - decrease refcount and delete when the |
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* refcount reaches 0. |
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* @n: notifier. If NULL, then this function does nothing. |
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*/ |
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void cec_notifier_conn_unregister(struct cec_notifier *n); |
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/** |
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* cec_notifier_cec_adap_register - find or create a new cec_notifier for the |
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* given device. |
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* @hdmi_dev: HDMI device that sends the events. |
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* @port_name: the connector name from which the event occurs. May be NULL |
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* if there is always only one HDMI connector created by the HDMI device. |
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* @adap: the cec adapter that registered this notifier. |
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* |
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* If a notifier for device @dev and connector @port_name already exists, then |
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* increase the refcount and return that notifier. |
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* |
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* If it doesn't exist, then allocate a new notifier struct and return a |
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* pointer to that new struct. |
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* |
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* Return NULL if the memory could not be allocated. |
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*/ |
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struct cec_notifier * |
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cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name, |
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struct cec_adapter *adap); |
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/** |
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* cec_notifier_cec_adap_unregister - decrease refcount and delete when the |
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* refcount reaches 0. |
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* @n: notifier. If NULL, then this function does nothing. |
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* @adap: the cec adapter that registered this notifier. |
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*/ |
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void cec_notifier_cec_adap_unregister(struct cec_notifier *n, |
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struct cec_adapter *adap); |
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/** |
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* cec_notifier_set_phys_addr - set a new physical address. |
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* @n: the CEC notifier |
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* @pa: the CEC physical address |
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* |
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* Set a new CEC physical address. |
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* Does nothing if @n == NULL. |
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*/ |
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void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa); |
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/** |
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* cec_notifier_set_phys_addr_from_edid - set parse the PA from the EDID. |
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* @n: the CEC notifier |
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* @edid: the struct edid pointer |
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* |
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* Parses the EDID to obtain the new CEC physical address and set it. |
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* Does nothing if @n == NULL. |
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*/ |
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void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n, |
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const struct edid *edid); |
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/** |
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* cec_notifier_parse_hdmi_phandle - find the hdmi device from "hdmi-phandle" |
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* @dev: the device with the "hdmi-phandle" device tree property |
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* |
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* Returns the device pointer referenced by the "hdmi-phandle" property. |
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* Note that the refcount of the returned device is not incremented. |
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* This device pointer is only used as a key value in the notifier |
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* list, but it is never accessed by the CEC driver. |
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*/ |
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struct device *cec_notifier_parse_hdmi_phandle(struct device *dev); |
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#else |
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static inline struct cec_notifier * |
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cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name, |
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const struct cec_connector_info *conn_info) |
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{ |
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/* A non-NULL pointer is expected on success */ |
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return (struct cec_notifier *)0xdeadfeed; |
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} |
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static inline void cec_notifier_conn_unregister(struct cec_notifier *n) |
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{ |
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} |
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static inline struct cec_notifier * |
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cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name, |
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struct cec_adapter *adap) |
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{ |
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/* A non-NULL pointer is expected on success */ |
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return (struct cec_notifier *)0xdeadfeed; |
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} |
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static inline void cec_notifier_cec_adap_unregister(struct cec_notifier *n, |
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struct cec_adapter *adap) |
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{ |
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} |
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static inline void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa) |
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{ |
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} |
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static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n, |
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const struct edid *edid) |
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{ |
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} |
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static inline struct device *cec_notifier_parse_hdmi_phandle(struct device *dev) |
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{ |
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return ERR_PTR(-ENODEV); |
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} |
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#endif |
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/** |
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* cec_notifier_phys_addr_invalidate() - set the physical address to INVALID |
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* |
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* @n: the CEC notifier |
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* |
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* This is a simple helper function to invalidate the physical |
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* address. Does nothing if @n == NULL. |
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*/ |
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static inline void cec_notifier_phys_addr_invalidate(struct cec_notifier *n) |
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{ |
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cec_notifier_set_phys_addr(n, CEC_PHYS_ADDR_INVALID); |
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} |
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#endif
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