i.e. echo 6 59 >/sys/devices/platform/soc-audio.0/codec_reg
will set register 0x06 to a value of 0x59
Signed-off-by: Troy Kisky <troy.kisky@xxxxxxxxxxxxxxxxxxx>
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index ad38113..df23b23 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1002,7 +1002,33 @@ static ssize_t codec_reg_show(struct device *dev,
return count;
}
-static DEVICE_ATTR(codec_reg, 0444, codec_reg_show, NULL);
+
+static ssize_t codec_reg_write(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ char *start = (char *)buf;
+ unsigned long reg, value;
+ int step = 1;
+ struct snd_soc_device *devdata = dev_get_drvdata(dev);
+ struct snd_soc_codec *codec = devdata->codec;
+
+ if (codec->reg_cache_step)
+ step = codec->reg_cache_step;
+
+ while (*start == ' ')
+ start++;
+ reg = simple_strtoul(start, &start, 16);
+ if ((reg >= codec->reg_cache_size) || (reg % step))
+ return -EINVAL;
+ while (*start == ' ')
+ start++;
+ if (strict_strtoul(start, 16, &value))
+ return -EINVAL;
+ codec->write(codec, reg, value);
+ return start - buf;
+}
+
+static DEVICE_ATTR(codec_reg, 0644, codec_reg_show, codec_reg_write);
/**
* snd_soc_new_ac97_codec - initailise AC97 device
--
1.5.4.3
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