xref: /openbmc/linux/sound/soc/codecs/es7241.c (revision f0b163b4)
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 
11 struct 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 
21 struct es7241_chip {
22 	const struct es7241_clock_mode *modes;
23 	unsigned int mode_num;
24 };
25 
26 struct 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 
es7241_set_mode(struct es7241_data * priv,int m0,int m1)36 static 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 
es7241_set_consumer_mode(struct es7241_data * priv,const struct es7241_clock_mode * mode,unsigned int mfs)49 static 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 
65 out_ok:
66 	es7241_set_mode(priv, 1, 1);
67 	return 0;
68 }
69 
es7241_set_provider_mode(struct es7241_data * priv,const struct es7241_clock_mode * mode,unsigned int mfs)70 static 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 different
76 	 * from what we provide, then error out
77 	 */
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 
es7241_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)86 static 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 		else
104 			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 
es7241_set_sysclk(struct snd_soc_dai * dai,int clk_id,unsigned int freq,int dir)112 static 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 
es7241_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)125 static 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 
155 static 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 
161 static 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 
175 static 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 
206 static const struct es7241_chip es7241_chip __maybe_unused = {
207 	.modes = es7241_modes,
208 	.mode_num = ARRAY_SIZE(es7241_modes),
209 };
210 
211 static 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 
220 static 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 
228 static 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 
es7241_parse_fmt(struct device * dev,struct es7241_data * priv)237 static 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 	else
250 		priv->fmt = SND_SOC_DAIFMT_I2S;
251 }
252 
es7241_probe(struct platform_device * pdev)253 static 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_OF
292 static const struct of_device_id es7241_ids[] = {
293 	{ .compatible = "everest,es7241", .data = &es7241_chip },
294 	{ }
295 };
296 MODULE_DEVICE_TABLE(of, es7241_ids);
297 #endif
298 
299 static 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 
307 module_platform_driver(es7241_driver);
308 
309 MODULE_DESCRIPTION("ASoC ES7241 audio codec driver");
310 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
311 MODULE_LICENSE("GPL");
312