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1 | /* |
2 | * cec-edid - HDMI Consumer Electronics Control & EDID helpers | |
3 | * | |
4 | * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved. | |
5 | * | |
6 | * This program is free software; you may redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
11 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
12 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
13 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
14 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
16 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
17 | * SOFTWARE. | |
18 | */ | |
19 | ||
20 | #ifndef _MEDIA_CEC_EDID_H | |
21 | #define _MEDIA_CEC_EDID_H | |
22 | ||
23 | #include <linux/types.h> | |
24 | ||
25 | #define CEC_PHYS_ADDR_INVALID 0xffff | |
26 | #define cec_phys_addr_exp(pa) \ | |
27 | ((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf | |
28 | ||
29 | /** | |
30 | * cec_get_edid_phys_addr() - find and return the physical address | |
31 | * | |
32 | * @edid: pointer to the EDID data | |
33 | * @size: size in bytes of the EDID data | |
34 | * @offset: If not %NULL then the location of the physical address | |
35 | * bytes in the EDID will be returned here. This is set to 0 | |
36 | * if there is no physical address found. | |
37 | * | |
38 | * Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none. | |
39 | */ | |
40 | u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size, | |
41 | unsigned int *offset); | |
42 | ||
43 | /** | |
44 | * cec_set_edid_phys_addr() - find and set the physical address | |
45 | * | |
46 | * @edid: pointer to the EDID data | |
47 | * @size: size in bytes of the EDID data | |
48 | * @phys_addr: the new physical address | |
49 | * | |
50 | * This function finds the location of the physical address in the EDID | |
51 | * and fills in the given physical address and updates the checksum | |
52 | * at the end of the EDID block. It does nothing if the EDID doesn't | |
53 | * contain a physical address. | |
54 | */ | |
55 | void cec_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr); | |
56 | ||
57 | /** | |
58 | * cec_phys_addr_for_input() - calculate the PA for an input | |
59 | * | |
60 | * @phys_addr: the physical address of the parent | |
61 | * @input: the number of the input port, must be between 1 and 15 | |
62 | * | |
63 | * This function calculates a new physical address based on the input | |
64 | * port number. For example: | |
65 | * | |
66 | * PA = 0.0.0.0 and input = 2 becomes 2.0.0.0 | |
67 | * | |
68 | * PA = 3.0.0.0 and input = 1 becomes 3.1.0.0 | |
69 | * | |
70 | * PA = 3.2.1.0 and input = 5 becomes 3.2.1.5 | |
71 | * | |
72 | * PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth. | |
73 | * | |
74 | * Return: the new physical address or CEC_PHYS_ADDR_INVALID. | |
75 | */ | |
76 | u16 cec_phys_addr_for_input(u16 phys_addr, u8 input); | |
77 | ||
78 | /** | |
79 | * cec_phys_addr_validate() - validate a physical address from an EDID | |
80 | * | |
81 | * @phys_addr: the physical address to validate | |
82 | * @parent: if not %NULL, then this is filled with the parents PA. | |
83 | * @port: if not %NULL, then this is filled with the input port. | |
84 | * | |
85 | * This validates a physical address as read from an EDID. If the | |
86 | * PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end), | |
87 | * then it will return -EINVAL. | |
88 | * | |
89 | * The parent PA is passed into %parent and the input port is passed into | |
90 | * %port. For example: | |
91 | * | |
92 | * PA = 0.0.0.0: has parent 0.0.0.0 and input port 0. | |
93 | * | |
94 | * PA = 1.0.0.0: has parent 0.0.0.0 and input port 1. | |
95 | * | |
96 | * PA = 3.2.0.0: has parent 3.0.0.0 and input port 2. | |
97 | * | |
98 | * PA = f.f.f.f: has parent f.f.f.f and input port 0. | |
99 | * | |
100 | * Return: 0 if the PA is valid, -EINVAL if not. | |
101 | */ | |
102 | int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port); | |
103 | ||
104 | #endif /* _MEDIA_CEC_EDID_H */ |