105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/*
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* cec-edid - HDMI Consumer Electronics Control & EDID helpers
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*
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* Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _MEDIA_CEC_EDID_H
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#define _MEDIA_CEC_EDID_H
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#include <linux/types.h>
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#define CEC_PHYS_ADDR_INVALID 0xffff
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#define cec_phys_addr_exp(pa) \
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((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf
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/**
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* cec_get_edid_phys_addr() - find and return the physical address
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*
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* @edid: pointer to the EDID data
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* @size: size in bytes of the EDID data
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* @offset: If not %NULL then the location of the physical address
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* bytes in the EDID will be returned here. This is set to 0
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* if there is no physical address found.
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*
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* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
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*/
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u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
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unsigned int *offset);
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/**
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* cec_set_edid_phys_addr() - find and set the physical address
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*
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* @edid: pointer to the EDID data
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* @size: size in bytes of the EDID data
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* @phys_addr: the new physical address
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*
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* This function finds the location of the physical address in the EDID
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* and fills in the given physical address and updates the checksum
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* at the end of the EDID block. It does nothing if the EDID doesn't
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* contain a physical address.
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*/
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void cec_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);
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/**
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* cec_phys_addr_for_input() - calculate the PA for an input
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*
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* @phys_addr: the physical address of the parent
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* @input: the number of the input port, must be between 1 and 15
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*
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* This function calculates a new physical address based on the input
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* port number. For example:
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*
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* PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
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*
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* PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
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*
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* PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
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*
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* PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
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*
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* Return: the new physical address or CEC_PHYS_ADDR_INVALID.
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*/
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u16 cec_phys_addr_for_input(u16 phys_addr, u8 input);
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/**
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* cec_phys_addr_validate() - validate a physical address from an EDID
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*
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* @phys_addr: the physical address to validate
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* @parent: if not %NULL, then this is filled with the parents PA.
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* @port: if not %NULL, then this is filled with the input port.
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*
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* This validates a physical address as read from an EDID. If the
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* PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
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* then it will return -EINVAL.
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*
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* The parent PA is passed into %parent and the input port is passed into
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* %port. For example:
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*
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* PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
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*
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* PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
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*
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* PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
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*
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* PA = f.f.f.f: has parent f.f.f.f and input port 0.
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*
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* Return: 0 if the PA is valid, -EINVAL if not.
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*/
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int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port);
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#endif /* _MEDIA_CEC_EDID_H */
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