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- // SPDX-License-Identifier: GPL-2.0
- //
- // ASoC machine driver for Snow boards
- #include <linux/clk.h>
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/of.h>
- #include <linux/of_device.h>
- #include <sound/pcm_params.h>
- #include <sound/soc.h>
- #include "i2s.h"
- #define FIN_PLL_RATE 24000000
- SND_SOC_DAILINK_DEFS(links,
- DAILINK_COMP_ARRAY(COMP_EMPTY()),
- DAILINK_COMP_ARRAY(COMP_EMPTY()),
- DAILINK_COMP_ARRAY(COMP_EMPTY()));
- struct snow_priv {
- struct snd_soc_dai_link dai_link;
- struct clk *clk_i2s_bus;
- };
- static int snow_card_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- static const unsigned int pll_rate[] = {
- 73728000U, 67737602U, 49152000U, 45158401U, 32768001U
- };
- struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
- struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
- int bfs, psr, rfs, bitwidth;
- unsigned long int rclk;
- long int freq = -EINVAL;
- int ret, i;
- bitwidth = snd_pcm_format_width(params_format(params));
- if (bitwidth < 0) {
- dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
- return bitwidth;
- }
- if (bitwidth != 16 && bitwidth != 24) {
- dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
- return -EINVAL;
- }
- bfs = 2 * bitwidth;
- switch (params_rate(params)) {
- case 16000:
- case 22050:
- case 24000:
- case 32000:
- case 44100:
- case 48000:
- case 88200:
- case 96000:
- rfs = 8 * bfs;
- break;
- case 64000:
- rfs = 384;
- break;
- case 8000:
- case 11025:
- case 12000:
- rfs = 16 * bfs;
- break;
- default:
- return -EINVAL;
- }
- rclk = params_rate(params) * rfs;
- for (psr = 8; psr > 0; psr /= 2) {
- for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
- if ((pll_rate[i] - rclk * psr) <= 2) {
- freq = pll_rate[i];
- break;
- }
- }
- }
- if (freq < 0) {
- dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
- return -EINVAL;
- }
- ret = clk_set_rate(priv->clk_i2s_bus, freq);
- if (ret < 0) {
- dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
- return ret;
- }
- return 0;
- }
- static const struct snd_soc_ops snow_card_ops = {
- .hw_params = snow_card_hw_params,
- };
- static int snow_late_probe(struct snd_soc_card *card)
- {
- struct snd_soc_pcm_runtime *rtd;
- struct snd_soc_dai *codec_dai;
- rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
- /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
- codec_dai = asoc_rtd_to_codec(rtd, 0);
- /* Set the MCLK rate for the codec */
- return snd_soc_dai_set_sysclk(codec_dai, 0,
- FIN_PLL_RATE, SND_SOC_CLOCK_IN);
- }
- static struct snd_soc_card snow_snd = {
- .name = "Snow-I2S",
- .owner = THIS_MODULE,
- .late_probe = snow_late_probe,
- };
- static int snow_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct snd_soc_card *card = &snow_snd;
- struct device_node *cpu, *codec;
- struct snd_soc_dai_link *link;
- struct snow_priv *priv;
- int ret;
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- link = &priv->dai_link;
- link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
- SND_SOC_DAIFMT_CBS_CFS;
- link->name = "Primary";
- link->stream_name = link->name;
- link->cpus = links_cpus;
- link->num_cpus = ARRAY_SIZE(links_cpus);
- link->codecs = links_codecs;
- link->num_codecs = ARRAY_SIZE(links_codecs);
- link->platforms = links_platforms;
- link->num_platforms = ARRAY_SIZE(links_platforms);
- card->dai_link = link;
- card->num_links = 1;
- card->dev = dev;
- /* Try new DT bindings with HDMI support first. */
- cpu = of_get_child_by_name(dev->of_node, "cpu");
- if (cpu) {
- link->ops = &snow_card_ops;
- link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
- of_node_put(cpu);
- if (!link->cpus->of_node) {
- dev_err(dev, "Failed parsing cpu/sound-dai property\n");
- return -EINVAL;
- }
- codec = of_get_child_by_name(dev->of_node, "codec");
- ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
- of_node_put(codec);
- if (ret < 0) {
- of_node_put(link->cpus->of_node);
- dev_err(dev, "Failed parsing codec node\n");
- return ret;
- }
- priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
- "i2s_opclk0");
- if (IS_ERR(priv->clk_i2s_bus)) {
- snd_soc_of_put_dai_link_codecs(link);
- of_node_put(link->cpus->of_node);
- return PTR_ERR(priv->clk_i2s_bus);
- }
- } else {
- link->codecs->dai_name = "HiFi";
- link->cpus->of_node = of_parse_phandle(dev->of_node,
- "samsung,i2s-controller", 0);
- if (!link->cpus->of_node) {
- dev_err(dev, "i2s-controller property parse error\n");
- return -EINVAL;
- }
- link->codecs->of_node = of_parse_phandle(dev->of_node,
- "samsung,audio-codec", 0);
- if (!link->codecs->of_node) {
- of_node_put(link->cpus->of_node);
- dev_err(dev, "audio-codec property parse error\n");
- return -EINVAL;
- }
- }
- link->platforms->of_node = link->cpus->of_node;
- /* Update card-name if provided through DT, else use default name */
- snd_soc_of_parse_card_name(card, "samsung,model");
- snd_soc_card_set_drvdata(card, priv);
- ret = devm_snd_soc_register_card(dev, card);
- if (ret)
- return dev_err_probe(&pdev->dev, ret,
- "snd_soc_register_card failed\n");
- return 0;
- }
- static int snow_remove(struct platform_device *pdev)
- {
- struct snow_priv *priv = platform_get_drvdata(pdev);
- struct snd_soc_dai_link *link = &priv->dai_link;
- of_node_put(link->cpus->of_node);
- of_node_put(link->codecs->of_node);
- snd_soc_of_put_dai_link_codecs(link);
- clk_put(priv->clk_i2s_bus);
- return 0;
- }
- static const struct of_device_id snow_of_match[] = {
- { .compatible = "google,snow-audio-max98090", },
- { .compatible = "google,snow-audio-max98091", },
- { .compatible = "google,snow-audio-max98095", },
- {},
- };
- MODULE_DEVICE_TABLE(of, snow_of_match);
- static struct platform_driver snow_driver = {
- .driver = {
- .name = "snow-audio",
- .pm = &snd_soc_pm_ops,
- .of_match_table = snow_of_match,
- },
- .probe = snow_probe,
- .remove = snow_remove,
- };
- module_platform_driver(snow_driver);
- MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
- MODULE_LICENSE("GPL");
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