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
|
/* SPDX-License-Identifier: BSD-2-Clause */
/* Iterate over device tree topology, breadth or depth-first
*
* COPYRIGHT (c) 2009 Cobham Gaisler AB.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <drvmgr/drvmgr.h>
#include <drvmgr/drvmgr_list.h>
#include "drvmgr_internal.h"
/* Traverse device tree breadth-first. Supports up to 31 buses */
static intptr_t drvmgr_for_each_dev_breadth(
intptr_t (*func)(struct drvmgr_dev *dev, void *arg),
void *arg
)
{
int ret = 0, i, pos;
struct drvmgr_bus *bus, *buses[32];
struct drvmgr_dev *dev;
pos = 0;
memset(&buses[0], 0, sizeof(buses));
buses[pos++] = drvmgr.root_dev.bus; /* Get root bus */
for (i = 0, bus = buses[0]; buses[i]; i++, bus = buses[i]) {
dev = bus->children;
while (dev) {
ret = func(dev, arg);
if (ret != 0)
break;
if (dev->bus && pos < 31)
buses[pos++] = dev->bus;
dev = dev->next_in_bus;
}
}
return ret;
}
/* Traverse device tree depth-first. */
static intptr_t drvmgr_for_each_dev_depth(
intptr_t (*func)(struct drvmgr_dev *dev, void *arg),
void *arg
)
{
int ret = 0;
struct drvmgr_dev *dev;
/* Get first device */
dev = drvmgr.root_dev.bus->children;
while (dev) {
ret = func(dev, arg);
if (ret != 0)
break;
if (dev->bus && dev->bus->children) {
dev = dev->bus->children;
} else {
next_dev:
if (dev->next_in_bus == NULL) {
/* Step up one level... back to parent bus */
dev = dev->parent->dev;
if (dev == &drvmgr.root_dev)
break;
goto next_dev;
} else {
dev = dev->next_in_bus;
}
}
}
return ret;
}
/* Traverse device tree depth-first or breadth-first */
intptr_t drvmgr_for_each_dev(
intptr_t (*func)(struct drvmgr_dev *dev, void *arg),
void *arg,
int options
)
{
intptr_t ret;
DRVMGR_LOCK_READ();
/* Get Root Device */
if (drvmgr.root_dev.bus->children != NULL) {
if (options & DRVMGR_FED_BF)
ret = drvmgr_for_each_dev_breadth(func, arg);
else
ret = drvmgr_for_each_dev_depth(func, arg);
} else
ret = 0;
DRVMGR_UNLOCK();
return ret;
}
|
