diff options
Diffstat (limited to 'sound/soc/meson/gx-card.c')
| -rw-r--r-- | sound/soc/meson/gx-card.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sound/soc/meson/gx-card.c b/sound/soc/meson/gx-card.c new file mode 100644 index 000000000..5119434a8 --- /dev/null +++ b/sound/soc/meson/gx-card.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +// +// Copyright (c) 2020 BayLibre, SAS. +// Author: Jerome Brunet <jbrunet@baylibre.com> + +#include <linux/module.h> +#include <linux/of_platform.h> +#include <sound/soc.h> +#include <sound/soc-dai.h> + +#include "meson-card.h" + +struct gx_dai_link_i2s_data { + unsigned int mclk_fs; +}; + +/* + * Base params for the codec to codec links + * Those will be over-written by the CPU side of the link + */ +static const struct snd_soc_pcm_stream codec_params = { + .formats = SNDRV_PCM_FMTBIT_S24_LE, + .rate_min = 5525, + .rate_max = 192000, + .channels_min = 1, + .channels_max = 8, +}; + +static int gx_card_i2s_be_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card); + struct gx_dai_link_i2s_data *be = + (struct gx_dai_link_i2s_data *)priv->link_data[rtd->num]; + + return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs); +} + +static const struct snd_soc_ops gx_card_i2s_be_ops = { + .hw_params = gx_card_i2s_be_hw_params, +}; + +static int gx_card_parse_i2s(struct snd_soc_card *card, + struct device_node *node, + int *index) +{ + struct meson_card *priv = snd_soc_card_get_drvdata(card); + struct snd_soc_dai_link *link = &card->dai_link[*index]; + struct gx_dai_link_i2s_data *be; + + /* Allocate i2s link parameters */ + be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL); + if (!be) + return -ENOMEM; + priv->link_data[*index] = be; + + /* Setup i2s link */ + link->ops = &gx_card_i2s_be_ops; + link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node); + + of_property_read_u32(node, "mclk-fs", &be->mclk_fs); + + return 0; +} + +static int gx_card_cpu_identify(struct snd_soc_dai_link_component *c, + char *match) +{ + if (of_device_is_compatible(c->of_node, DT_PREFIX "aiu")) { + if (strstr(c->dai_name, match)) + return 1; + } + + /* dai not matched */ + return 0; +} + +static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np, + int *index) +{ + struct snd_soc_dai_link *dai_link = &card->dai_link[*index]; + struct snd_soc_dai_link_component *cpu; + int ret; + + cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL); + if (!cpu) + return -ENOMEM; + + dai_link->cpus = cpu; + dai_link->num_cpus = 1; + + ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node, + &dai_link->cpus->dai_name); + if (ret) + return ret; + + if (gx_card_cpu_identify(dai_link->cpus, "FIFO")) + return meson_card_set_fe_link(card, dai_link, np, true); + + ret = meson_card_set_be_link(card, dai_link, np); + if (ret) + return ret; + + /* Or apply codec to codec params if necessary */ + if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) { + dai_link->params = &codec_params; + } else { + dai_link->no_pcm = 1; + snd_soc_dai_link_set_capabilities(dai_link); + /* Check if the cpu is the i2s encoder and parse i2s data */ + if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder")) + ret = gx_card_parse_i2s(card, np, index); + } + + return ret; +} + +static const struct meson_card_match_data gx_card_match_data = { + .add_link = gx_card_add_link, +}; + +static const struct of_device_id gx_card_of_match[] = { + { + .compatible = "amlogic,gx-sound-card", + .data = &gx_card_match_data, + }, {} +}; +MODULE_DEVICE_TABLE(of, gx_card_of_match); + +static struct platform_driver gx_card_pdrv = { + .probe = meson_card_probe, + .remove = meson_card_remove, + .driver = { + .name = "gx-sound-card", + .of_match_table = gx_card_of_match, + }, +}; +module_platform_driver(gx_card_pdrv); + +MODULE_DESCRIPTION("Amlogic GX ALSA machine driver"); +MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); +MODULE_LICENSE("GPL v2"); |