From 7523a271682fc1f35355da344249ce8f8c8b8cb9 Mon Sep 17 00:00:00 2001 From: Omair Mohammed Abdullah Date: Tue, 15 Jul 2014 21:34:48 +0530 Subject: ASoC: core: add a helper for extended byte controls using TLV ALSA supports arbitrary length TLVs for each kcontrol that can be used to pass metadata about the control (e.g. volumes, enum information). The same transport mechanism is now used for arbitrary length data by defining a new helper. Signed-off-by: Omair Mohammed Abdullah Signed-off-by: Vinod Koul Signed-off-by: Mark Brown --- sound/soc/soc-core.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'sound/soc/soc-core.c') diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index b87d7d882e6d..a9ce63f634b2 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -3267,6 +3267,27 @@ int snd_soc_bytes_info_ext(struct snd_kcontrol *kcontrol, } EXPORT_SYMBOL_GPL(snd_soc_bytes_info_ext); +int snd_soc_bytes_tlv_callback(struct snd_kcontrol *kcontrol, int op_flag, + unsigned int size, unsigned int __user *tlv) +{ + struct soc_bytes_ext *params = (void *)kcontrol->private_value; + unsigned int count = size < params->max ? size : params->max; + int ret = -ENXIO; + + switch (op_flag) { + case SNDRV_CTL_TLV_OP_READ: + if (params->get) + ret = params->get(tlv, count); + break; + case SNDRV_CTL_TLV_OP_WRITE: + if (params->put) + ret = params->put(tlv, count); + break; + } + return ret; +} +EXPORT_SYMBOL_GPL(snd_soc_bytes_tlv_callback); + /** * snd_soc_info_xr_sx - signed multi register info callback * @kcontrol: mreg control -- cgit v1.2.2