From 93b0f3eeebdce6f32417187b5d24ea218a3e7fb4 Mon Sep 17 00:00:00 2001 From: Jean-Francois Moine Date: Tue, 25 Nov 2014 13:16:12 +0100 Subject: [PATCH] ASoC: core: add multi-codec support in DT This patch exports a core function which handles the DT description of multi-codec links (as: "sound-dai = <&hdmi 0>, <&spdif_codec>;") and creates a CODEC component array in the DAI link. Signed-off-by: Jean-Francois Moine Signed-off-by: Mark Brown --- include/sound/soc.h | 3 ++ sound/soc/soc-core.c | 110 +++++++++++++++++++++++++++++++++++++------ 2 files changed, 98 insertions(+), 15 deletions(-) diff --git a/include/sound/soc.h b/include/sound/soc.h index 7ba7130037a0..2750e6ad0128 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -1451,6 +1451,9 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np, struct device_node **framemaster); int snd_soc_of_get_dai_name(struct device_node *of_node, const char **dai_name); +int snd_soc_of_get_dai_link_codecs(struct device *dev, + struct device_node *of_node, + struct snd_soc_dai_link *dai_link); #include diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 4c8f8a23a0e9..72a3ad047048 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -4750,36 +4750,30 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np, } EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt); -int snd_soc_of_get_dai_name(struct device_node *of_node, - const char **dai_name) +static int snd_soc_get_dai_name(struct of_phandle_args *args, + const char **dai_name) { struct snd_soc_component *pos; - struct of_phandle_args args; - int ret; - - ret = of_parse_phandle_with_args(of_node, "sound-dai", - "#sound-dai-cells", 0, &args); - if (ret) - return ret; - - ret = -EPROBE_DEFER; + int ret = -EPROBE_DEFER; mutex_lock(&client_mutex); list_for_each_entry(pos, &component_list, list) { - if (pos->dev->of_node != args.np) + if (pos->dev->of_node != args->np) continue; if (pos->driver->of_xlate_dai_name) { - ret = pos->driver->of_xlate_dai_name(pos, &args, dai_name); + ret = pos->driver->of_xlate_dai_name(pos, + args, + dai_name); } else { int id = -1; - switch (args.args_count) { + switch (args->args_count) { case 0: id = 0; /* same as dai_drv[0] */ break; case 1: - id = args.args[0]; + id = args->args[0]; break; default: /* not supported */ @@ -4801,6 +4795,21 @@ int snd_soc_of_get_dai_name(struct device_node *of_node, break; } mutex_unlock(&client_mutex); + return ret; +} + +int snd_soc_of_get_dai_name(struct device_node *of_node, + const char **dai_name) +{ + struct of_phandle_args args; + int ret; + + ret = of_parse_phandle_with_args(of_node, "sound-dai", + "#sound-dai-cells", 0, &args); + if (ret) + return ret; + + ret = snd_soc_get_dai_name(&args, dai_name); of_node_put(args.np); @@ -4808,6 +4817,77 @@ int snd_soc_of_get_dai_name(struct device_node *of_node, } EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_name); +/* + * snd_soc_of_get_dai_link_codecs - Parse a list of CODECs in the devicetree + * @dev: Card device + * @of_node: Device node + * @dai_link: DAI link + * + * Builds an array of CODEC DAI components from the DAI link property + * 'sound-dai'. + * The array is set in the DAI link and the number of DAIs is set accordingly. + * The device nodes in the array (of_node) must be dereferenced by the caller. + * + * Returns 0 for success + */ +int snd_soc_of_get_dai_link_codecs(struct device *dev, + struct device_node *of_node, + struct snd_soc_dai_link *dai_link) +{ + struct of_phandle_args args; + struct snd_soc_dai_link_component *component; + char *name; + int index, num_codecs, ret; + + /* Count the number of CODECs */ + name = "sound-dai"; + num_codecs = of_count_phandle_with_args(of_node, name, + "#sound-dai-cells"); + if (num_codecs <= 0) { + if (num_codecs == -ENOENT) + dev_err(dev, "No 'sound-dai' property\n"); + else + dev_err(dev, "Bad phandle in 'sound-dai'\n"); + return num_codecs; + } + component = devm_kzalloc(dev, + sizeof *component * num_codecs, + GFP_KERNEL); + if (!component) + return -ENOMEM; + dai_link->codecs = component; + dai_link->num_codecs = num_codecs; + + /* Parse the list */ + for (index = 0, component = dai_link->codecs; + index < dai_link->num_codecs; + index++, component++) { + ret = of_parse_phandle_with_args(of_node, name, + "#sound-dai-cells", + index, &args); + if (ret) + goto err; + component->of_node = args.np; + ret = snd_soc_get_dai_name(&args, &component->dai_name); + if (ret < 0) + goto err; + } + return 0; +err: + for (index = 0, component = dai_link->codecs; + index < dai_link->num_codecs; + index++, component++) { + if (!component->of_node) + break; + of_node_put(component->of_node); + component->of_node = NULL; + } + dai_link->codecs = NULL; + dai_link->num_codecs = 0; + return ret; +} +EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs); + static int __init snd_soc_init(void) { #ifdef CONFIG_DEBUG_FS -- 2.20.1