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