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

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