Commit 2bc9a81e authored by Dimitris Papastamos's avatar Dimitris Papastamos Committed by Mark Brown
Browse files

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: default avatarDimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 2cfec93f

sound/soc/soc-core.c

+24 −3
Original line number Diff line number Diff line
@@ -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,

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