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Linux/include/media/cec-notifier.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * cec-notifier.h - notify CEC drivers of physical address changes
  4  *
  5  * Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
  6  * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
  7  */
  8 
  9 #ifndef LINUX_CEC_NOTIFIER_H
 10 #define LINUX_CEC_NOTIFIER_H
 11 
 12 #include <linux/err.h>
 13 #include <media/cec.h>
 14 
 15 struct device;
 16 struct edid;
 17 struct cec_adapter;
 18 struct cec_notifier;
 19 
 20 #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
 21 
 22 /**
 23  * cec_notifier_conn_register - find or create a new cec_notifier for the given
 24  * HDMI device and connector tuple.
 25  * @hdmi_dev: HDMI device that sends the events.
 26  * @port_name: the connector name from which the event occurs. May be NULL
 27  * if there is always only one HDMI connector created by the HDMI device.
 28  * @conn_info: the connector info from which the event occurs (may be NULL)
 29  *
 30  * If a notifier for device @dev and connector @port_name already exists, then
 31  * increase the refcount and return that notifier.
 32  *
 33  * If it doesn't exist, then allocate a new notifier struct and return a
 34  * pointer to that new struct.
 35  *
 36  * Return NULL if the memory could not be allocated.
 37  */
 38 struct cec_notifier *
 39 cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
 40                            const struct cec_connector_info *conn_info);
 41 
 42 /**
 43  * cec_notifier_conn_unregister - decrease refcount and delete when the
 44  * refcount reaches 0.
 45  * @n: notifier. If NULL, then this function does nothing.
 46  */
 47 void cec_notifier_conn_unregister(struct cec_notifier *n);
 48 
 49 /**
 50  * cec_notifier_cec_adap_register - find or create a new cec_notifier for the
 51  * given device.
 52  * @hdmi_dev: HDMI device that sends the events.
 53  * @port_name: the connector name from which the event occurs. May be NULL
 54  * if there is always only one HDMI connector created by the HDMI device.
 55  * @adap: the cec adapter that registered this notifier.
 56  *
 57  * If a notifier for device @dev and connector @port_name already exists, then
 58  * increase the refcount and return that notifier.
 59  *
 60  * If it doesn't exist, then allocate a new notifier struct and return a
 61  * pointer to that new struct.
 62  *
 63  * Return NULL if the memory could not be allocated.
 64  */
 65 struct cec_notifier *
 66 cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
 67                                struct cec_adapter *adap);
 68 
 69 /**
 70  * cec_notifier_cec_adap_unregister - decrease refcount and delete when the
 71  * refcount reaches 0.
 72  * @n: notifier. If NULL, then this function does nothing.
 73  * @adap: the cec adapter that registered this notifier.
 74  */
 75 void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
 76                                       struct cec_adapter *adap);
 77 
 78 /**
 79  * cec_notifier_set_phys_addr - set a new physical address.
 80  * @n: the CEC notifier
 81  * @pa: the CEC physical address
 82  *
 83  * Set a new CEC physical address.
 84  * Does nothing if @n == NULL.
 85  */
 86 void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa);
 87 
 88 /**
 89  * cec_notifier_set_phys_addr_from_edid - set parse the PA from the EDID.
 90  * @n: the CEC notifier
 91  * @edid: the struct edid pointer
 92  *
 93  * Parses the EDID to obtain the new CEC physical address and set it.
 94  * Does nothing if @n == NULL.
 95  */
 96 void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
 97                                           const struct edid *edid);
 98 
 99 /**
100  * cec_notifier_parse_hdmi_phandle - find the hdmi device from "hdmi-phandle"
101  * @dev: the device with the "hdmi-phandle" device tree property
102  *
103  * Returns the device pointer referenced by the "hdmi-phandle" property.
104  * Note that the refcount of the returned device is not incremented.
105  * This device pointer is only used as a key value in the notifier
106  * list, but it is never accessed by the CEC driver.
107  */
108 struct device *cec_notifier_parse_hdmi_phandle(struct device *dev);
109 
110 #else
111 
112 static inline struct cec_notifier *
113 cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
114                            const struct cec_connector_info *conn_info)
115 {
116         /* A non-NULL pointer is expected on success */
117         return (struct cec_notifier *)0xdeadfeed;
118 }
119 
120 static inline void cec_notifier_conn_unregister(struct cec_notifier *n)
121 {
122 }
123 
124 static inline struct cec_notifier *
125 cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
126                                struct cec_adapter *adap)
127 {
128         /* A non-NULL pointer is expected on success */
129         return (struct cec_notifier *)0xdeadfeed;
130 }
131 
132 static inline void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
133                                                     struct cec_adapter *adap)
134 {
135 }
136 
137 static inline void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
138 {
139 }
140 
141 static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
142                                                         const struct edid *edid)
143 {
144 }
145 
146 static inline struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
147 {
148         return ERR_PTR(-ENODEV);
149 }
150 
151 #endif
152 
153 /**
154  * cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
155  *
156  * @n: the CEC notifier
157  *
158  * This is a simple helper function to invalidate the physical
159  * address. Does nothing if @n == NULL.
160  */
161 static inline void cec_notifier_phys_addr_invalidate(struct cec_notifier *n)
162 {
163         cec_notifier_set_phys_addr(n, CEC_PHYS_ADDR_INVALID);
164 }
165 
166 #endif
167 

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