--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#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_slave;
+ 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_slave_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_master_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_slave)
+ return es7241_set_slave_mode(priv, mode, mfs);
+ else
+ return es7241_set_master_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_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ priv->is_slave = true;
+ break;
+ case SND_SOC_DAIFMT_CBM_CFM:
+ priv->is_slave = 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 = {
+ .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,
+ .non_legacy_dai_naming = 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;
+ int err;
+
+ 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)) {
+ err = PTR_ERR(priv->reset);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'reset' gpio: %d", err);
+ return err;
+ }
+
+ priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->m0)) {
+ err = PTR_ERR(priv->m0);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'm0' gpio: %d", err);
+ return err;
+ }
+
+ priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->m1)) {
+ err = PTR_ERR(priv->m1);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'm1' gpio: %d", err);
+ return err;
+ }
+
+ 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 <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi3.git / commitdiff