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.
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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