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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-07-29 11:42:25 +0100
committerJaroslav Kysela <perex@perex.cz>2008-07-29 21:32:15 +0200
commit58cd33c0f375578cfda25a52ed280caa888b6254 (patch)
treec670df251546d8affa258e0720d94d0a6aabcd4f /sound
parent8a33de9e51673dbdadb552d888a4544aefe0c31d (diff)
downloadlinaro-lsk-58cd33c0f375578cfda25a52ed280caa888b6254.tar.gz
ALSA: ASoC: Allow codecs to override register display
Some codecs have unusual features in their register maps such as very large registers representing arrays of coefficients. Support these codecs in the register cache sysfs file by allowing them to provide a function register_display() overriding the default output for register contents. Also ensure that we don't overflow PAGE_SIZE while writing out the register dump. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/soc-core.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 83f1190293a..5d3bf731a4b 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -970,9 +970,29 @@ static ssize_t codec_reg_show(struct device *dev,
step = codec->reg_cache_step;
count += sprintf(buf, "%s registers\n", codec->name);
- for (i = 0; i < codec->reg_cache_size; i += step)
- count += sprintf(buf + count, "%2x: %4x\n", i,
- codec->read(codec, i));
+ for (i = 0; i < codec->reg_cache_size; i += step) {
+ count += sprintf(buf + count, "%2x: ", i);
+ if (count >= PAGE_SIZE - 1)
+ break;
+
+ if (codec->display_register)
+ count += codec->display_register(codec, buf + count,
+ PAGE_SIZE - count, i);
+ else
+ count += snprintf(buf + count, PAGE_SIZE - count,
+ "%4x", codec->read(codec, i));
+
+ if (count >= PAGE_SIZE - 1)
+ break;
+
+ count += snprintf(buf + count, PAGE_SIZE - count, "\n");
+ if (count >= PAGE_SIZE - 1)
+ break;
+ }
+
+ /* Truncate count; min() would cause a warning */
+ if (count >= PAGE_SIZE)
+ count = PAGE_SIZE - 1;
return count;
}