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- // SPDX-License-Identifier: (GPL-2.0 OR MIT)
- //
- // Copyright (c) 2018 BayLibre, SAS.
- // Author: Jerome Brunet <[email protected]>
- #include <linux/gpio/consumer.h>
- #include <linux/of_platform.h>
- #include <linux/module.h>
- #include <sound/soc.h>
- struct es7241_clock_mode {
- unsigned int rate_min;
- unsigned int rate_max;
- unsigned int *slv_mfs;
- unsigned int slv_mfs_num;
- unsigned int mst_mfs;
- unsigned int mst_m0:1;
- unsigned int mst_m1:1;
- };
- struct es7241_chip {
- const struct es7241_clock_mode *modes;
- unsigned int mode_num;
- };
- struct es7241_data {
- struct gpio_desc *reset;
- struct gpio_desc *m0;
- struct gpio_desc *m1;
- unsigned int fmt;
- unsigned int mclk;
- bool is_consumer;
- const struct es7241_chip *chip;
- };
- static void es7241_set_mode(struct es7241_data *priv, int m0, int m1)
- {
- /* put the device in reset */
- gpiod_set_value_cansleep(priv->reset, 0);
- /* set the mode */
- gpiod_set_value_cansleep(priv->m0, m0);
- gpiod_set_value_cansleep(priv->m1, m1);
- /* take the device out of reset - datasheet does not specify a delay */
- gpiod_set_value_cansleep(priv->reset, 1);
- }
- static int es7241_set_consumer_mode(struct es7241_data *priv,
- const struct es7241_clock_mode *mode,
- unsigned int mfs)
- {
- int j;
- if (!mfs)
- goto out_ok;
- for (j = 0; j < mode->slv_mfs_num; j++) {
- if (mode->slv_mfs[j] == mfs)
- goto out_ok;
- }
- return -EINVAL;
- out_ok:
- es7241_set_mode(priv, 1, 1);
- return 0;
- }
- static int es7241_set_provider_mode(struct es7241_data *priv,
- const struct es7241_clock_mode *mode,
- unsigned int mfs)
- {
- /*
- * We can't really set clock ratio, if the mclk/lrclk is different
- * from what we provide, then error out
- */
- if (mfs && mfs != mode->mst_mfs)
- return -EINVAL;
- es7241_set_mode(priv, mode->mst_m0, mode->mst_m1);
- return 0;
- }
- static int es7241_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params,
- struct snd_soc_dai *dai)
- {
- struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
- unsigned int rate = params_rate(params);
- unsigned int mfs = priv->mclk / rate;
- int i;
- for (i = 0; i < priv->chip->mode_num; i++) {
- const struct es7241_clock_mode *mode = &priv->chip->modes[i];
- if (rate < mode->rate_min || rate >= mode->rate_max)
- continue;
- if (priv->is_consumer)
- return es7241_set_consumer_mode(priv, mode, mfs);
- else
- return es7241_set_provider_mode(priv, mode, mfs);
- }
- /* should not happen */
- dev_err(dai->dev, "unsupported rate: %u\n", rate);
- return -EINVAL;
- }
- static int es7241_set_sysclk(struct snd_soc_dai *dai, int clk_id,
- unsigned int freq, int dir)
- {
- struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
- if (dir == SND_SOC_CLOCK_IN && clk_id == 0) {
- priv->mclk = freq;
- return 0;
- }
- return -ENOTSUPP;
- }
- static int es7241_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
- {
- struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);
- if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
- dev_err(dai->dev, "Unsupported dai clock inversion\n");
- return -EINVAL;
- }
- if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != priv->fmt) {
- dev_err(dai->dev, "Invalid dai format\n");
- return -EINVAL;
- }
- switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
- case SND_SOC_DAIFMT_CBC_CFC:
- priv->is_consumer = true;
- break;
- case SND_SOC_DAIFMT_CBP_CFP:
- priv->is_consumer = false;
- break;
- default:
- dev_err(dai->dev, "Unsupported clock configuration\n");
- return -EINVAL;
- }
- return 0;
- }
- static const struct snd_soc_dai_ops es7241_dai_ops = {
- .set_fmt = es7241_set_fmt,
- .hw_params = es7241_hw_params,
- .set_sysclk = es7241_set_sysclk,
- };
- static struct snd_soc_dai_driver es7241_dai = {
- .name = "es7241-hifi",
- .capture = {
- .stream_name = "Capture",
- .channels_min = 2,
- .channels_max = 2,
- .rates = SNDRV_PCM_RATE_8000_192000,
- .formats = (SNDRV_PCM_FMTBIT_S16_LE |
- SNDRV_PCM_FMTBIT_S24_3LE |
- SNDRV_PCM_FMTBIT_S24_LE),
- },
- .ops = &es7241_dai_ops,
- };
- static const struct es7241_clock_mode es7241_modes[] = {
- {
- /* Single speed mode */
- .rate_min = 8000,
- .rate_max = 50000,
- .slv_mfs = (unsigned int[]) { 256, 384, 512, 768, 1024 },
- .slv_mfs_num = 5,
- .mst_mfs = 256,
- .mst_m0 = 0,
- .mst_m1 = 0,
- }, {
- /* Double speed mode */
- .rate_min = 50000,
- .rate_max = 100000,
- .slv_mfs = (unsigned int[]) { 128, 192 },
- .slv_mfs_num = 2,
- .mst_mfs = 128,
- .mst_m0 = 1,
- .mst_m1 = 0,
- }, {
- /* Quad speed mode */
- .rate_min = 100000,
- .rate_max = 200000,
- .slv_mfs = (unsigned int[]) { 64 },
- .slv_mfs_num = 1,
- .mst_mfs = 64,
- .mst_m0 = 0,
- .mst_m1 = 1,
- },
- };
- static const struct es7241_chip es7241_chip __maybe_unused = {
- .modes = es7241_modes,
- .mode_num = ARRAY_SIZE(es7241_modes),
- };
- static const struct snd_soc_dapm_widget es7241_dapm_widgets[] = {
- SND_SOC_DAPM_INPUT("AINL"),
- SND_SOC_DAPM_INPUT("AINR"),
- SND_SOC_DAPM_DAC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
- SND_SOC_DAPM_REGULATOR_SUPPLY("VDDP", 0, 0),
- SND_SOC_DAPM_REGULATOR_SUPPLY("VDDD", 0, 0),
- SND_SOC_DAPM_REGULATOR_SUPPLY("VDDA", 0, 0),
- };
- static const struct snd_soc_dapm_route es7241_dapm_routes[] = {
- { "ADC", NULL, "AINL", },
- { "ADC", NULL, "AINR", },
- { "ADC", NULL, "VDDA", },
- { "Capture", NULL, "VDDP", },
- { "Capture", NULL, "VDDD", },
- };
- static const struct snd_soc_component_driver es7241_component_driver = {
- .dapm_widgets = es7241_dapm_widgets,
- .num_dapm_widgets = ARRAY_SIZE(es7241_dapm_widgets),
- .dapm_routes = es7241_dapm_routes,
- .num_dapm_routes = ARRAY_SIZE(es7241_dapm_routes),
- .idle_bias_on = 1,
- .endianness = 1,
- };
- static void es7241_parse_fmt(struct device *dev, struct es7241_data *priv)
- {
- bool is_leftj;
- /*
- * The format is given by a pull resistor on the SDOUT pin:
- * pull-up for i2s, pull-down for left justified.
- */
- is_leftj = of_property_read_bool(dev->of_node,
- "everest,sdout-pull-down");
- if (is_leftj)
- priv->fmt = SND_SOC_DAIFMT_LEFT_J;
- else
- priv->fmt = SND_SOC_DAIFMT_I2S;
- }
- static int es7241_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct es7241_data *priv;
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- platform_set_drvdata(pdev, priv);
- priv->chip = of_device_get_match_data(dev);
- if (!priv->chip) {
- dev_err(dev, "failed to match device\n");
- return -ENODEV;
- }
- es7241_parse_fmt(dev, priv);
- priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
- if (IS_ERR(priv->reset))
- return dev_err_probe(dev, PTR_ERR(priv->reset),
- "Failed to get 'reset' gpio");
- priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW);
- if (IS_ERR(priv->m0))
- return dev_err_probe(dev, PTR_ERR(priv->m0),
- "Failed to get 'm0' gpio");
- priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW);
- if (IS_ERR(priv->m1))
- return dev_err_probe(dev, PTR_ERR(priv->m1),
- "Failed to get 'm1' gpio");
- return devm_snd_soc_register_component(&pdev->dev,
- &es7241_component_driver,
- &es7241_dai, 1);
- }
- #ifdef CONFIG_OF
- static const struct of_device_id es7241_ids[] = {
- { .compatible = "everest,es7241", .data = &es7241_chip },
- { }
- };
- MODULE_DEVICE_TABLE(of, es7241_ids);
- #endif
- static struct platform_driver es7241_driver = {
- .driver = {
- .name = "es7241",
- .of_match_table = of_match_ptr(es7241_ids),
- },
- .probe = es7241_probe,
- };
- module_platform_driver(es7241_driver);
- MODULE_DESCRIPTION("ASoC ES7241 audio codec driver");
- MODULE_AUTHOR("Jerome Brunet <[email protected]>");
- MODULE_LICENSE("GPL");
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