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_slave;
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_slave_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_master_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
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_slave)
102			return es7241_set_slave_mode(priv, mode, mfs);
103		else
104			return es7241_set_master_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_MASTER_MASK) {
140	case SND_SOC_DAIFMT_CBS_CFS:
141		priv->is_slave = true;
142		break;
143	case SND_SOC_DAIFMT_CBM_CFM:
144		priv->is_slave = 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 = {
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	.non_legacy_dai_naming	= 1,
236};
237
238static void es7241_parse_fmt(struct device *dev, struct es7241_data *priv)
239{
240	bool is_leftj;
241
242	/*
243	 * The format is given by a pull resistor on the SDOUT pin:
244	 * pull-up for i2s, pull-down for left justified.
245	 */
246	is_leftj = of_property_read_bool(dev->of_node,
247					 "everest,sdout-pull-down");
248	if (is_leftj)
249		priv->fmt = SND_SOC_DAIFMT_LEFT_J;
250	else
251		priv->fmt = SND_SOC_DAIFMT_I2S;
252}
253
254static int es7241_probe(struct platform_device *pdev)
255{
256	struct device *dev = &pdev->dev;
257	struct es7241_data *priv;
258	int err;
259
260	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
261	if (!priv)
262		return -ENOMEM;
263	platform_set_drvdata(pdev, priv);
264
265	priv->chip = of_device_get_match_data(dev);
266	if (!priv->chip) {
267		dev_err(dev, "failed to match device\n");
268		return -ENODEV;
269	}
270
271	es7241_parse_fmt(dev, priv);
272
273	priv->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
274	if (IS_ERR(priv->reset)) {
275		err = PTR_ERR(priv->reset);
276		if (err != -EPROBE_DEFER)
277			dev_err(dev, "Failed to get 'reset' gpio: %d", err);
278		return err;
279	}
280
281	priv->m0 = devm_gpiod_get_optional(dev, "m0", GPIOD_OUT_LOW);
282	if (IS_ERR(priv->m0)) {
283		err = PTR_ERR(priv->m0);
284		if (err != -EPROBE_DEFER)
285			dev_err(dev, "Failed to get 'm0' gpio: %d", err);
286		return err;
287	}
288
289	priv->m1 = devm_gpiod_get_optional(dev, "m1", GPIOD_OUT_LOW);
290	if (IS_ERR(priv->m1)) {
291		err = PTR_ERR(priv->m1);
292		if (err != -EPROBE_DEFER)
293			dev_err(dev, "Failed to get 'm1' gpio: %d", err);
294		return err;
295	}
296
297	return devm_snd_soc_register_component(&pdev->dev,
298				      &es7241_component_driver,
299				      &es7241_dai, 1);
300}
301
302#ifdef CONFIG_OF
303static const struct of_device_id es7241_ids[] = {
304	{ .compatible = "everest,es7241", .data = &es7241_chip },
305	{ }
306};
307MODULE_DEVICE_TABLE(of, es7241_ids);
308#endif
309
310static struct platform_driver es7241_driver = {
311	.driver = {
312		.name = "es7241",
313		.of_match_table = of_match_ptr(es7241_ids),
314	},
315	.probe = es7241_probe,
316};
317
318module_platform_driver(es7241_driver);
319
320MODULE_DESCRIPTION("ASoC ES7241 audio codec driver");
321MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
322MODULE_LICENSE("GPL");
323