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snd: iec958: split status creation and fill

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In some situations, like a codec probe, we need to provide an IEC status
default but don't have access to the sampling rate and width yet since
no stream has been configured yet.

Each and every driver has its own default, whereas the core iec958 code
also has some buried in the snd_pcm_create_iec958_consumer functions.

Let's split these functions in two to provide a default that doesn't
rely on the sampling rate and width, and another function to fill them
when available.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Maxime Ripard
2021-04-28 15:29:13 +02:00
committed by Phil Elwell
parent ab8462008b
commit 523d3b895b
2 changed files with 96 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/sound/pcm_iec958.h
View File

@@ -4,6 +4,14 @@
#include <linux/types.h>
int snd_pcm_create_iec958_consumer_default(u8 *cs, size_t len);
int snd_pcm_fill_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
size_t len);
int snd_pcm_fill_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
u8 *cs, size_t len);
int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
size_t len);

85
sound/core/pcm_iec958.c
View File

@@ -9,14 +9,34 @@
#include <sound/pcm_params.h>
#include <sound/pcm_iec958.h>
static int create_iec958_consumer(uint rate, uint sample_width,
u8 *cs, size_t len)
int snd_pcm_create_iec958_consumer_default(u8 *cs, size_t len)
{
unsigned int fs, ws;
if (len < 4)
return -EINVAL;
memset(cs, 0, len);
cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
cs[1] = IEC958_AES1_CON_GENERAL;
cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID;
if (len > 4)
cs[4] = IEC958_AES4_CON_WORDLEN_NOTID;
return len;
}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_default);
static int fill_iec958_consumer(uint rate, uint sample_width,
u8 *cs, size_t len)
{
if (len < 4)
return -EINVAL;
if ((cs[3] & IEC958_AES3_CON_FS) == IEC958_AES3_CON_FS_NOTID) {
unsigned int fs;
switch (rate) {
case 32000:
fs = IEC958_AES3_CON_FS_32000;
@@ -43,7 +63,14 @@ static int create_iec958_consumer(uint rate, uint sample_width,
return -EINVAL;
}
if (len > 4) {
cs[3] &= ~IEC958_AES3_CON_FS;
cs[3] |= fs;
}
if (len > 4 &&
(cs[4] & IEC958_AES4_CON_WORDLEN) == IEC958_AES4_CON_WORDLEN_NOTID) {
unsigned int ws;
switch (sample_width) {
case 16:
ws = IEC958_AES4_CON_WORDLEN_20_16;
@@ -64,21 +91,30 @@ static int create_iec958_consumer(uint rate, uint sample_width,
default:
return -EINVAL;
}
cs[4] &= ~IEC958_AES4_CON_WORDLEN;
cs[4] |= ws;
}
memset(cs, 0, len);
cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
cs[1] = IEC958_AES1_CON_GENERAL;
cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs;
if (len > 4)
cs[4] = ws;
return len;
}
int snd_pcm_fill_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
u8 *cs, size_t len)
{
return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
}
EXPORT_SYMBOL(snd_pcm_fill_iec958_consumer_hw_params);
int snd_pcm_fill_iec958_consumer(struct snd_pcm_runtime *runtime,
u8 *cs, size_t len)
{
return fill_iec958_consumer(runtime->rate,
snd_pcm_format_width(runtime->format),
cs, len);
}
EXPORT_SYMBOL(snd_pcm_fill_iec958_consumer);
/**
* snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
* @runtime: pcm runtime structure with ->rate filled in
@@ -95,9 +131,13 @@ static int create_iec958_consumer(uint rate, uint sample_width,
int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
size_t len)
{
return create_iec958_consumer(runtime->rate,
snd_pcm_format_width(runtime->format),
cs, len);
int ret;
ret = snd_pcm_create_iec958_consumer_default(cs, len);
if (ret < 0)
return ret;
return snd_pcm_fill_iec958_consumer(runtime, cs, len);
}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
@@ -117,7 +157,12 @@ EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
u8 *cs, size_t len)
{
return create_iec958_consumer(params_rate(params), params_width(params),
cs, len);
int ret;
ret = snd_pcm_create_iec958_consumer_default(cs, len);
if (ret < 0)
return ret;
return fill_iec958_consumer(params_rate(params), params_width(params), cs, len);
}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);