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143 lines
3.6 KiB
143 lines
3.6 KiB
// SPDX-License-Identifier: (GPL-2.0 OR MIT) |
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// |
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// Copyright (c) 2020 BayLibre, SAS. |
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// Author: Jerome Brunet <[email protected]> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <sound/soc.h> |
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#include <sound/soc-dai.h> |
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#include "meson-card.h" |
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struct gx_dai_link_i2s_data { |
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unsigned int mclk_fs; |
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}; |
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/* |
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* Base params for the codec to codec links |
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* Those will be over-written by the CPU side of the link |
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*/ |
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static const struct snd_soc_pcm_stream codec_params = { |
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.formats = SNDRV_PCM_FMTBIT_S24_LE, |
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.rate_min = 5525, |
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.rate_max = 192000, |
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.channels_min = 1, |
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.channels_max = 8, |
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}; |
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static int gx_card_i2s_be_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card); |
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struct gx_dai_link_i2s_data *be = |
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(struct gx_dai_link_i2s_data *)priv->link_data[rtd->num]; |
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return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs); |
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} |
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static const struct snd_soc_ops gx_card_i2s_be_ops = { |
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.hw_params = gx_card_i2s_be_hw_params, |
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}; |
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static int gx_card_parse_i2s(struct snd_soc_card *card, |
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struct device_node *node, |
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int *index) |
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{ |
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struct meson_card *priv = snd_soc_card_get_drvdata(card); |
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struct snd_soc_dai_link *link = &card->dai_link[*index]; |
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struct gx_dai_link_i2s_data *be; |
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/* Allocate i2s link parameters */ |
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be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL); |
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if (!be) |
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return -ENOMEM; |
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priv->link_data[*index] = be; |
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/* Setup i2s link */ |
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link->ops = &gx_card_i2s_be_ops; |
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link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node); |
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of_property_read_u32(node, "mclk-fs", &be->mclk_fs); |
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return 0; |
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} |
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static int gx_card_cpu_identify(struct snd_soc_dai_link_component *c, |
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char *match) |
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{ |
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if (of_device_is_compatible(c->of_node, DT_PREFIX "aiu")) { |
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if (strstr(c->dai_name, match)) |
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return 1; |
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} |
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/* dai not matched */ |
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return 0; |
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} |
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static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np, |
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int *index) |
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{ |
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struct snd_soc_dai_link *dai_link = &card->dai_link[*index]; |
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struct snd_soc_dai_link_component *cpu; |
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int ret; |
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cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL); |
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if (!cpu) |
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return -ENOMEM; |
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dai_link->cpus = cpu; |
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dai_link->num_cpus = 1; |
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ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node, |
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&dai_link->cpus->dai_name); |
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if (ret) |
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return ret; |
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if (gx_card_cpu_identify(dai_link->cpus, "FIFO")) |
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return meson_card_set_fe_link(card, dai_link, np, true); |
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ret = meson_card_set_be_link(card, dai_link, np); |
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if (ret) |
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return ret; |
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/* Or apply codec to codec params if necessary */ |
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if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) { |
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dai_link->params = &codec_params; |
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} else { |
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dai_link->no_pcm = 1; |
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snd_soc_dai_link_set_capabilities(dai_link); |
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/* Check if the cpu is the i2s encoder and parse i2s data */ |
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if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder")) |
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ret = gx_card_parse_i2s(card, np, index); |
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} |
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return ret; |
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} |
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static const struct meson_card_match_data gx_card_match_data = { |
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.add_link = gx_card_add_link, |
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}; |
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static const struct of_device_id gx_card_of_match[] = { |
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{ |
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.compatible = "amlogic,gx-sound-card", |
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.data = &gx_card_match_data, |
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}, {} |
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}; |
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MODULE_DEVICE_TABLE(of, gx_card_of_match); |
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static struct platform_driver gx_card_pdrv = { |
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.probe = meson_card_probe, |
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.remove = meson_card_remove, |
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.driver = { |
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.name = "gx-sound-card", |
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.of_match_table = gx_card_of_match, |
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}, |
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}; |
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module_platform_driver(gx_card_pdrv); |
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MODULE_DESCRIPTION("Amlogic GX ALSA machine driver"); |
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MODULE_AUTHOR("Jerome Brunet <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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