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ASoC: soc-core: Ensure codec_reg has fixed length fields 

Make the format of the codec_reg file more easily parsable.  Remove
the header field which gives the codec name.  These changes are important
when it comes to extend the debugfs codec_reg file to dump more than
PAGE_SIZE bytes to make it easier to calculate offsets within the
file.

We still need to handle the case when the snd_soc_read() call fails
and <no data: %d> is outputted.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Dimitris Papastamos 2011-02-01 12:24:08 +00:00 committed by Mark Brown
parent 2cfec93fec
commit 2bc9a81e2a
1 changed files with 24 additions and 3 deletions
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27
sound/soc/soc-core.c
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@ -69,10 +69,32 @@ static int pmdown_time = 5000;
module_param(pmdown_time, int, 0);
MODULE_PARM_DESC(pmdown_time, "DAPM stream powerdown time (msecs)");
/* returns the minimum number of bytes needed to represent
* a particular given value */
static int min_bytes_needed(unsigned long val)
{
int c = 0;
int i;
for (i = (sizeof val * 8) - 1; i >= 0; --i, ++c)
if (val & (1UL << i))
break;
c = (sizeof val * 8) - c;
if (!c || (c % 8))
c = (c + 8) / 8;
else
c /= 8;
return c;
}
/* codec register dump */
static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
{
int ret, i, step = 1, count = 0;
int wordsize, regsize;
wordsize = codec->driver->reg_word_size * 2;
regsize = min_bytes_needed(codec->driver->reg_cache_size) * 2;
if (!codec->driver->reg_cache_size)
return 0;
@ -80,12 +102,11 @@ static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
if (codec->driver->reg_cache_step)
step = codec->driver->reg_cache_step;
count += sprintf(buf, "%s registers\n", codec->name);
for (i = 0; i < codec->driver->reg_cache_size; i += step) {
if (codec->readable_register && !codec->readable_register(codec, i))
continue;
count += sprintf(buf + count, "%2x: ", i);
count += sprintf(buf + count, "%.*x: ", regsize, i);
if (count >= PAGE_SIZE - 1)
break;
@ -101,7 +122,7 @@ static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
if (ret >= 0)
count += snprintf(buf + count,
PAGE_SIZE - count,
"%4x", ret);
"%.*x", wordsize, ret);
else
count += snprintf(buf + count,
PAGE_SIZE - count,