From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Fri, 31 Jul 2009 17:26:51 +0000 (+0100)
Subject: ASoC: Allow CODECs to flag invalid registers
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=77ee09c67e051a5ebd19a53ba3945dbdc8d21b3c;p=linux-beck.git

ASoC: Allow CODECs to flag invalid registers

This helps CODECs with sparse register maps work better with the
register cache display interface.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 756fb59772d1..55b330937260 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -385,6 +385,7 @@ struct snd_soc_codec {
 	int (*display_register)(struct snd_soc_codec *, char *,
 				size_t, unsigned int);
 	int (*volatile_register)(unsigned int);
+	int (*readable_register)(unsigned int);
 	hw_write_t hw_write;
 	hw_read_t hw_read;
 	void *reg_cache;
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 5eabb7117608..fb8d7a766155 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1156,6 +1156,9 @@ static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
 
 	count += sprintf(buf, "%s registers\n", codec->name);
 	for (i = 0; i < codec->reg_cache_size; i += step) {
+		if (codec->readable_register && !codec->readable_register(i))
+			continue;
+
 		count += sprintf(buf + count, "%2x: ", i);
 		if (count >= PAGE_SIZE - 1)
 			break;