1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* cec-notifier.c - 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.
*/
#include <linux/export.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/of_platform.h>
#include <media/cec.h>
#include <media/cec-notifier.h>
#include <drm/drm_edid.h>
struct cec_notifier {
struct mutex lock;
struct list_head head;
struct kref kref;
struct device *hdmi_dev;
const char *conn_name;
struct cec_adapter *cec_adap;
void (*callback)(struct cec_adapter *adap, u16 pa);
u16 phys_addr;
};
static LIST_HEAD(cec_notifiers);
static DEFINE_MUTEX(cec_notifiers_lock);
struct cec_notifier *
cec_notifier_get_conn(struct device *hdmi_dev, const char *conn_name)
{
struct cec_notifier *n;
mutex_lock(&cec_notifiers_lock);
list_for_each_entry(n, &cec_notifiers, head) {
if (n->hdmi_dev == hdmi_dev &&
(!conn_name ||
(n->conn_name && !strcmp(n->conn_name, conn_name)))) {
kref_get(&n->kref);
mutex_unlock(&cec_notifiers_lock);
return n;
}
}
n = kzalloc(sizeof(*n), GFP_KERNEL);
if (!n)
goto unlock;
n->hdmi_dev = hdmi_dev;
if (conn_name) {
n->conn_name = kstrdup(conn_name, GFP_KERNEL);
if (!n->conn_name) {
kfree(n);
n = NULL;
goto unlock;
}
}
n->phys_addr = CEC_PHYS_ADDR_INVALID;
mutex_init(&n->lock);
kref_init(&n->kref);
list_add_tail(&n->head, &cec_notifiers);
unlock:
mutex_unlock(&cec_notifiers_lock);
return n;
}
EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
static void cec_notifier_release(struct kref *kref)
{
struct cec_notifier *n =
container_of(kref, struct cec_notifier, kref);
list_del(&n->head);
kfree(n->conn_name);
kfree(n);
}
void cec_notifier_put(struct cec_notifier *n)
{
mutex_lock(&cec_notifiers_lock);
kref_put(&n->kref, cec_notifier_release);
mutex_unlock(&cec_notifiers_lock);
}
EXPORT_SYMBOL_GPL(cec_notifier_put);
void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
{
if (n == NULL)
return;
mutex_lock(&n->lock);
n->phys_addr = pa;
if (n->callback)
n->callback(n->cec_adap, n->phys_addr);
mutex_unlock(&n->lock);
}
EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
const struct edid *edid)
{
u16 pa = CEC_PHYS_ADDR_INVALID;
if (n == NULL)
return;
if (edid && edid->extensions)
pa = cec_get_edid_phys_addr((const u8 *)edid,
EDID_LENGTH * (edid->extensions + 1), NULL);
cec_notifier_set_phys_addr(n, pa);
}
EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
void cec_notifier_register(struct cec_notifier *n,
struct cec_adapter *adap,
void (*callback)(struct cec_adapter *adap, u16 pa))
{
kref_get(&n->kref);
mutex_lock(&n->lock);
n->cec_adap = adap;
n->callback = callback;
n->callback(adap, n->phys_addr);
mutex_unlock(&n->lock);
}
EXPORT_SYMBOL_GPL(cec_notifier_register);
void cec_notifier_unregister(struct cec_notifier *n)
{
mutex_lock(&n->lock);
n->callback = NULL;
mutex_unlock(&n->lock);
cec_notifier_put(n);
}
EXPORT_SYMBOL_GPL(cec_notifier_unregister);
struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
{
struct platform_device *hdmi_pdev;
struct device *hdmi_dev = NULL;
struct device_node *np;
np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
if (!np) {
dev_err(dev, "Failed to find HDMI node in device tree\n");
return ERR_PTR(-ENODEV);
}
hdmi_pdev = of_find_device_by_node(np);
of_node_put(np);
if (hdmi_pdev) {
hdmi_dev = &hdmi_pdev->dev;
/*
* Note that the device struct is only used as a key into the
* cec_notifiers list, it is never actually accessed.
* So we decrement the reference here so we don't leak
* memory.
*/
put_device(hdmi_dev);
return hdmi_dev;
}
return ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);
|
