5f39231888
MediaTek sound card drivers are checking whether a DAI link is present
and used on a board to assign the correct parameters and this is done
by checking the codec DAI names at probe time.
If no real codec is present, assign the dummy codec to the DAI link
to avoid NULL pointer during string comparison.
Fixes: 4302187d95 ("ASoC: mediatek: common: add soundcard driver common code")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://msgid.link/r/20240313110147.1267793-5-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* mtk-soundcard-driver.c -- MediaTek soundcard driver common
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*
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* Copyright (c) 2022 MediaTek Inc.
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* Author: Trevor Wu <trevor.wu@mediatek.com>
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <sound/soc.h>
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#include "mtk-soundcard-driver.h"
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static int set_card_codec_info(struct snd_soc_card *card,
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struct device_node *sub_node,
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struct snd_soc_dai_link *dai_link)
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{
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struct device *dev = card->dev;
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struct device_node *codec_node;
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int ret;
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codec_node = of_get_child_by_name(sub_node, "codec");
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if (!codec_node) {
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dev_dbg(dev, "%s no specified codec: setting dummy.\n", dai_link->name);
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dai_link->codecs = &snd_soc_dummy_dlc;
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dai_link->num_codecs = 1;
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dai_link->dynamic = 1;
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return 0;
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}
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/* set card codec info */
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ret = snd_soc_of_get_dai_link_codecs(dev, codec_node, dai_link);
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of_node_put(codec_node);
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if (ret < 0)
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return dev_err_probe(dev, ret, "%s: codec dai not found\n",
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dai_link->name);
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return 0;
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}
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static int set_dailink_daifmt(struct snd_soc_card *card,
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struct device_node *sub_node,
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struct snd_soc_dai_link *dai_link)
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{
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unsigned int daifmt;
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const char *str;
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int ret;
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struct {
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char *name;
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unsigned int val;
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} of_clk_table[] = {
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{ "cpu", SND_SOC_DAIFMT_CBC_CFC },
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{ "codec", SND_SOC_DAIFMT_CBP_CFP },
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};
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daifmt = snd_soc_daifmt_parse_format(sub_node, NULL);
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if (daifmt) {
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dai_link->dai_fmt &= SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
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dai_link->dai_fmt |= daifmt;
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}
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/*
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* check "mediatek,clk-provider = xxx"
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* SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK area
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*/
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ret = of_property_read_string(sub_node, "mediatek,clk-provider", &str);
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if (ret == 0) {
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int i;
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for (i = 0; i < ARRAY_SIZE(of_clk_table); i++) {
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if (strcmp(str, of_clk_table[i].name) == 0) {
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dai_link->dai_fmt &= ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
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dai_link->dai_fmt |= of_clk_table[i].val;
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break;
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}
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}
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}
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return 0;
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}
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int parse_dai_link_info(struct snd_soc_card *card)
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{
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struct device *dev = card->dev;
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struct device_node *sub_node;
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struct snd_soc_dai_link *dai_link;
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const char *dai_link_name;
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int ret, i;
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/* Loop over all the dai link sub nodes */
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for_each_available_child_of_node(dev->of_node, sub_node) {
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if (of_property_read_string(sub_node, "link-name",
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&dai_link_name)) {
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of_node_put(sub_node);
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return -EINVAL;
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}
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for_each_card_prelinks(card, i, dai_link) {
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if (!strcmp(dai_link_name, dai_link->name))
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break;
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}
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if (i >= card->num_links) {
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of_node_put(sub_node);
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return -EINVAL;
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}
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ret = set_card_codec_info(card, sub_node, dai_link);
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if (ret < 0) {
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of_node_put(sub_node);
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return ret;
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}
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ret = set_dailink_daifmt(card, sub_node, dai_link);
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if (ret < 0) {
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of_node_put(sub_node);
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return ret;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(parse_dai_link_info);
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void clean_card_reference(struct snd_soc_card *card)
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{
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struct snd_soc_dai_link *dai_link;
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int i;
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/* release codec reference gotten by set_card_codec_info */
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for_each_card_prelinks(card, i, dai_link)
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snd_soc_of_put_dai_link_codecs(dai_link);
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}
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EXPORT_SYMBOL_GPL(clean_card_reference);
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