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[media] cec: add cec_s_phys_addr_from_edid helper function

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This function simplifies the integration of CEC in DRM drivers.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2017-06-07 11:46:08 -03:00 committed by Mauro Carvalho Chehab
parent acec363015
commit 23111ec304
3 changed files with 31 additions and 0 deletions
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8
Documentation/media/kapi/cec-core.rst
View File

@ -306,6 +306,14 @@ then the CEC adapter will be disabled. If you change a valid physical address
to another valid physical address, then this function will first set the
address to CEC_PHYS_ADDR_INVALID before enabling the new physical address.
.. c:function::
void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
const struct edid *edid);
A helper function that extracts the physical address from the edid struct
and calls cec_s_phys_addr() with that address, or CEC_PHYS_ADDR_INVALID
if the EDID did not contain a physical address or edid was a NULL pointer.
.. c:function::
int cec_s_log_addrs(struct cec_adapter *adap,
struct cec_log_addrs *log_addrs, bool block);

14
drivers/media/cec/cec-adap.c
View File

@ -28,6 +28,8 @@
#include <linux/string.h>
#include <linux/types.h>
#include <drm/drm_edid.h>
#include "cec-priv.h"
static void cec_fill_msg_report_features(struct cec_adapter *adap,
@ -1408,6 +1410,18 @@ void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
}
EXPORT_SYMBOL_GPL(cec_s_phys_addr);
void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
const struct edid *edid)
{
u16 pa = CEC_PHYS_ADDR_INVALID;
if (edid && edid->extensions)
pa = cec_get_edid_phys_addr((const u8 *)edid,
EDID_LENGTH * (edid->extensions + 1), NULL);
cec_s_phys_addr(adap, pa, false);
}
EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
/*
* Called from either the ioctl or a driver to set the logical addresses.
*

9
include/media/cec.h
View File

@ -206,6 +206,8 @@ static inline bool cec_is_sink(const struct cec_adapter *adap)
#define cec_phys_addr_exp(pa) \
((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf
struct edid;
#if IS_ENABLED(CONFIG_CEC_CORE)
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
void *priv, const char *name, u32 caps, u8 available_las);
@ -217,6 +219,8 @@ int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs,
bool block);
void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
bool block);
void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
const struct edid *edid);
int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
bool block);
@ -326,6 +330,11 @@ static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
{
}
static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
const struct edid *edid)
{
}
static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
unsigned int *offset)
{