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1// SPDX-License-Identifier: (GPL-2.0 OR MIT)2//3// Copyright (c) 2018 BayLibre, SAS.4// Author: Jerome Brunet <jbrunet@baylibre.com>5 6#include <linux/gpio/consumer.h>7#include <linux/of_platform.h>8#include <linux/module.h>9#include <sound/soc.h>10 11struct es7241_clock_mode {12 unsigned int rate_min;13 unsigned int rate_max;14 unsigned int *slv_mfs;15 unsigned int slv_mfs_num;16 unsigned int mst_mfs;17 unsigned int mst_m0:1;18 unsigned int mst_m1:1;19};20 21struct es7241_chip {22 const struct es7241_clock_mode *modes;23 unsigned int mode_num;24};25 26struct es7241_data {27 struct gpio_desc *reset;28 struct gpio_desc *m0;29 struct gpio_desc *m1;30 unsigned int fmt;31 unsigned int mclk;32 bool is_consumer;33 const struct es7241_chip *chip;34};35 36static void es7241_set_mode(struct es7241_data *priv, int m0, int m1)37{38 /* put the device in reset */39 gpiod_set_value_cansleep(priv->reset, 0);40 41 /* set the mode */42 gpiod_set_value_cansleep(priv->m0, m0);43 gpiod_set_value_cansleep(priv->m1, m1);44 45 /* take the device out of reset - datasheet does not specify a delay */46 gpiod_set_value_cansleep(priv->reset, 1);47}48 49static int es7241_set_consumer_mode(struct es7241_data *priv,50 const struct es7241_clock_mode *mode,51 unsigned int mfs)52{53 int j;54 55 if (!mfs)56 goto out_ok;57 58 for (j = 0; j < mode->slv_mfs_num; j++) {59 if (mode->slv_mfs[j] == mfs)60 goto out_ok;61 }62 63 return -EINVAL;64 65out_ok:66 es7241_set_mode(priv, 1, 1);67 return 0;68}69 70static int es7241_set_provider_mode(struct es7241_data *priv,71 const struct es7241_clock_mode *mode,72 unsigned int mfs)73{74 /*75 * We can't really set clock ratio, if the mclk/lrclk is different76 * from what we provide, then error out77 */78 if (mfs && mfs != mode->mst_mfs)79 return -EINVAL;80 81 es7241_set_mode(priv, mode->mst_m0, mode->mst_m1);82 83 return 0;84}85 86static int es7241_hw_params(struct snd_pcm_substream *substream,87 struct snd_pcm_hw_params *params,88 struct snd_soc_dai *dai)89{90 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);91 unsigned int rate = params_rate(params);92 unsigned int mfs = priv->mclk / rate;93 int i;94 95 for (i = 0; i < priv->chip->mode_num; i++) {96 const struct es7241_clock_mode *mode = &priv->chip->modes[i];97 98 if (rate < mode->rate_min || rate >= mode->rate_max)99 continue;100 101 if (priv->is_consumer)102 return es7241_set_consumer_mode(priv, mode, mfs);103 else104 return es7241_set_provider_mode(priv, mode, mfs);105 }106 107 /* should not happen */108 dev_err(dai->dev, "unsupported rate: %u\n", rate);109 return -EINVAL;110}111 112static int es7241_set_sysclk(struct snd_soc_dai *dai, int clk_id,113 unsigned int freq, int dir)114{115 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);116 117 if (dir == SND_SOC_CLOCK_IN && clk_id == 0) {118 priv->mclk = freq;119 return 0;120 }121 122 return -ENOTSUPP;123}124 125static int es7241_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)126{127 struct es7241_data *priv = snd_soc_dai_get_drvdata(dai);128 129 if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {130 dev_err(dai->dev, "Unsupported dai clock inversion\n");131 return -EINVAL;132 }133 134 if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != priv->fmt) {135 dev_err(dai->dev, "Invalid dai format\n");136 return -EINVAL;137 }138 139 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {140 case SND_SOC_DAIFMT_CBC_CFC:141 priv->is_consumer = true;142 break;143 case SND_SOC_DAIFMT_CBP_CFP:144 priv->is_consumer = false;145 break;146 147 default:148 dev_err(dai->dev, "Unsupported clock configuration\n");149 return -EINVAL;150 }151 152 return 0;153}154 155static const struct snd_soc_dai_ops es7241_dai_ops = {156 .set_fmt = es7241_set_fmt,157 .hw_params = es7241_hw_params,158 .set_sysclk = es7241_set_sysclk,159};160 161static struct snd_soc_dai_driver es7241_dai = {162 .name = "es7241-hifi",163 .capture = {164 .stream_name = "Capture",165 .channels_min = 2,166 .channels_max = 2,167 .rates = SNDRV_PCM_RATE_8000_192000,168 .formats = (SNDRV_PCM_FMTBIT_S16_LE |169 SNDRV_PCM_FMTBIT_S24_3LE |170 SNDRV_PCM_FMTBIT_S24_LE),171 },172 .ops = &es7241_dai_ops,173};174 175static const struct es7241_clock_mode es7241_modes[] = {176 {177 /* Single speed mode */178 .rate_min = 8000,179 .rate_max = 50000,180 .slv_mfs = (unsigned int[]) { 256, 384, 512, 768, 1024 },181 .slv_mfs_num = 5,182 .mst_mfs = 256,183 .mst_m0 = 0,184 .mst_m1 = 0,185 }, {186 /* Double speed mode */187 .rate_min = 50000,188 .rate_max = 100000,189 .slv_mfs = (unsigned int[]) { 128, 192 },190 .slv_mfs_num = 2,191 .mst_mfs = 128,192 .mst_m0 = 1,193 .mst_m1 = 0,194 }, {195 /* Quad speed mode */196 .rate_min = 100000,197 .rate_max = 200000,198 .slv_mfs = (unsigned int[]) { 64 },199 .slv_mfs_num = 1,200 .mst_mfs = 64,201 .mst_m0 = 0,202 .mst_m1 = 1,203 },204};205 206static const struct es7241_chip es7241_chip __maybe_unused = {207 .modes = es7241_modes,208 .mode_num = ARRAY_SIZE(es7241_modes),209};210 211static const struct snd_soc_dapm_widget es7241_dapm_widgets[] = {212 SND_SOC_DAPM_INPUT("AINL"),213 SND_SOC_DAPM_INPUT("AINR"),214 SND_SOC_DAPM_DAC("ADC", "Capture", SND_SOC_NOPM, 0, 0),215 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDP", 0, 0),216 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDD", 0, 0),217 SND_SOC_DAPM_REGULATOR_SUPPLY("VDDA", 0, 0),218};219 220static const struct snd_soc_dapm_route es7241_dapm_routes[] = {221 { "ADC", NULL, "AINL", },222 { "ADC", NULL, "AINR", },223 { "ADC", NULL, "VDDA", },224 { "Capture", NULL, "VDDP", },225 { "Capture", NULL, "VDDD", },226};227 228static const struct snd_soc_component_driver es7241_component_driver = {229 .dapm_widgets = es7241_dapm_widgets,230 .num_dapm_widgets = ARRAY_SIZE(es7241_dapm_widgets),231 .dapm_routes = es7241_dapm_routes,232 .num_dapm_routes = ARRAY_SIZE(es7241_dapm_routes),233 .idle_bias_on = 1,234 .endianness = 1,235};236 237static void es7241_parse_fmt(struct device *dev, struct es7241_data *priv)238{239 bool is_leftj;240 241 /*242 * The format is given by a pull resistor on the SDOUT pin:243 * pull-up for i2s, pull-down for left justified.244 */245 is_leftj = of_property_read_bool(dev->of_node,246 "everest,sdout-pull-down");247 if (is_leftj)248 priv->fmt = SND_SOC_DAIFMT_LEFT_J;249 else250 priv->fmt = SND_SOC_DAIFMT_I2S;251}252 253static int es7241_probe(struct platform_device *pdev)254{255 struct device *dev = &pdev->dev;256 struct es7241_data *priv;257 258 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);259 if (!priv)260 return -ENOMEM;261 platform_set_drvdata(pdev, priv);262 263 priv->chip = of_device_get_match_data(dev);264 if (!priv->chip) {265 dev_err(dev, "failed to match device\n");266 return -ENODEV;267 }268 269 es7241_parse_fmt(dev, priv);270 271 priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);272 if (IS_ERR(priv->reset))273 return dev_err_probe(dev, PTR_ERR(priv->reset),274 "Failed to get 'reset' gpio");275 276 priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW);277 if (IS_ERR(priv->m0))278 return dev_err_probe(dev, PTR_ERR(priv->m0),279 "Failed to get 'm0' gpio");280 281 priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW);282 if (IS_ERR(priv->m1))283 return dev_err_probe(dev, PTR_ERR(priv->m1),284 "Failed to get 'm1' gpio");285 286 return devm_snd_soc_register_component(&pdev->dev,287 &es7241_component_driver,288 &es7241_dai, 1);289}290 291#ifdef CONFIG_OF292static const struct of_device_id es7241_ids[] = {293 { .compatible = "everest,es7241", .data = &es7241_chip },294 { }295};296MODULE_DEVICE_TABLE(of, es7241_ids);297#endif298 299static struct platform_driver es7241_driver = {300 .driver = {301 .name = "es7241",302 .of_match_table = of_match_ptr(es7241_ids),303 },304 .probe = es7241_probe,305};306 307module_platform_driver(es7241_driver);308 309MODULE_DESCRIPTION("ASoC ES7241 audio codec driver");310MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");311MODULE_LICENSE("GPL");312