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Linux/sound/soc/intel/boards/bytcht_es8316.c

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  1 /*
  2  *  bytcht_es8316.c - ASoc Machine driver for Intel Baytrail/Cherrytrail
  3  *                    platforms with Everest ES8316 SoC
  4  *
  5  *  Copyright (C) 2017 Endless Mobile, Inc.
  6  *  Authors: David Yang <yangxiaohua@everest-semi.com>,
  7  *           Daniel Drake <drake@endlessm.com>
  8  *
  9  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 10  *
 11  *  This program is free software; you can redistribute it and/or modify
 12  *  it under the terms of the GNU General Public License as published by
 13  *  the Free Software Foundation; version 2 of the License.
 14  *
 15  *  This program is distributed in the hope that it will be useful, but
 16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  *  General Public License for more details.
 19  *
 20  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 21  */
 22 #include <linux/init.h>
 23 #include <linux/module.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/device.h>
 26 #include <linux/slab.h>
 27 #include <asm/platform_sst_audio.h>
 28 #include <linux/clk.h>
 29 #include <sound/pcm.h>
 30 #include <sound/pcm_params.h>
 31 #include <sound/soc.h>
 32 #include <sound/soc-acpi.h>
 33 #include "../atom/sst-atom-controls.h"
 34 #include "../common/sst-dsp.h"
 35 
 36 struct byt_cht_es8316_private {
 37         struct clk *mclk;
 38 };
 39 
 40 static const struct snd_soc_dapm_widget byt_cht_es8316_widgets[] = {
 41         SND_SOC_DAPM_HP("Headphone", NULL),
 42 
 43         /*
 44          * The codec supports two analog microphone inputs. I have only
 45          * tested MIC1. A DMIC route could also potentially be added
 46          * if such functionality is found on another platform.
 47          */
 48         SND_SOC_DAPM_MIC("Microphone 1", NULL),
 49         SND_SOC_DAPM_MIC("Microphone 2", NULL),
 50 };
 51 
 52 static const struct snd_soc_dapm_route byt_cht_es8316_audio_map[] = {
 53         {"MIC1", NULL, "Microphone 1"},
 54         {"MIC2", NULL, "Microphone 2"},
 55 
 56         {"Headphone", NULL, "HPOL"},
 57         {"Headphone", NULL, "HPOR"},
 58 
 59         {"Playback", NULL, "ssp2 Tx"},
 60         {"ssp2 Tx", NULL, "codec_out0"},
 61         {"ssp2 Tx", NULL, "codec_out1"},
 62         {"codec_in0", NULL, "ssp2 Rx" },
 63         {"codec_in1", NULL, "ssp2 Rx" },
 64         {"ssp2 Rx", NULL, "Capture"},
 65 };
 66 
 67 static const struct snd_kcontrol_new byt_cht_es8316_controls[] = {
 68         SOC_DAPM_PIN_SWITCH("Headphone"),
 69         SOC_DAPM_PIN_SWITCH("Microphone 1"),
 70         SOC_DAPM_PIN_SWITCH("Microphone 2"),
 71 };
 72 
 73 static int byt_cht_es8316_init(struct snd_soc_pcm_runtime *runtime)
 74 {
 75         struct snd_soc_card *card = runtime->card;
 76         struct byt_cht_es8316_private *priv = snd_soc_card_get_drvdata(card);
 77         int ret;
 78 
 79         card->dapm.idle_bias_off = true;
 80 
 81         /*
 82          * The firmware might enable the clock at boot (this information
 83          * may or may not be reflected in the enable clock register).
 84          * To change the rate we must disable the clock first to cover these
 85          * cases. Due to common clock framework restrictions that do not allow
 86          * to disable a clock that has not been enabled, we need to enable
 87          * the clock first.
 88          */
 89         ret = clk_prepare_enable(priv->mclk);
 90         if (!ret)
 91                 clk_disable_unprepare(priv->mclk);
 92 
 93         ret = clk_set_rate(priv->mclk, 19200000);
 94         if (ret)
 95                 dev_err(card->dev, "unable to set MCLK rate\n");
 96 
 97         ret = clk_prepare_enable(priv->mclk);
 98         if (ret)
 99                 dev_err(card->dev, "unable to enable MCLK\n");
100 
101         ret = snd_soc_dai_set_sysclk(runtime->codec_dai, 0, 19200000,
102                                      SND_SOC_CLOCK_IN);
103         if (ret < 0) {
104                 dev_err(card->dev, "can't set codec clock %d\n", ret);
105                 return ret;
106         }
107 
108         return 0;
109 }
110 
111 static const struct snd_soc_pcm_stream byt_cht_es8316_dai_params = {
112         .formats = SNDRV_PCM_FMTBIT_S24_LE,
113         .rate_min = 48000,
114         .rate_max = 48000,
115         .channels_min = 2,
116         .channels_max = 2,
117 };
118 
119 static int byt_cht_es8316_codec_fixup(struct snd_soc_pcm_runtime *rtd,
120                             struct snd_pcm_hw_params *params)
121 {
122         struct snd_interval *rate = hw_param_interval(params,
123                         SNDRV_PCM_HW_PARAM_RATE);
124         struct snd_interval *channels = hw_param_interval(params,
125                                                 SNDRV_PCM_HW_PARAM_CHANNELS);
126         int ret;
127 
128         /* The DSP will covert the FE rate to 48k, stereo */
129         rate->min = rate->max = 48000;
130         channels->min = channels->max = 2;
131 
132         /* set SSP2 to 24-bit */
133         params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
134 
135         /*
136          * Default mode for SSP configuration is TDM 4 slot, override config
137          * with explicit setting to I2S 2ch 24-bit. The word length is set with
138          * dai_set_tdm_slot() since there is no other API exposed
139          */
140         ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
141                                 SND_SOC_DAIFMT_I2S     |
142                                 SND_SOC_DAIFMT_NB_NF   |
143                                 SND_SOC_DAIFMT_CBS_CFS
144                 );
145         if (ret < 0) {
146                 dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
147                 return ret;
148         }
149 
150         ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 24);
151         if (ret < 0) {
152                 dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
153                 return ret;
154         }
155 
156         return 0;
157 }
158 
159 static int byt_cht_es8316_aif1_startup(struct snd_pcm_substream *substream)
160 {
161         return snd_pcm_hw_constraint_single(substream->runtime,
162                         SNDRV_PCM_HW_PARAM_RATE, 48000);
163 }
164 
165 static const struct snd_soc_ops byt_cht_es8316_aif1_ops = {
166         .startup = byt_cht_es8316_aif1_startup,
167 };
168 
169 static struct snd_soc_dai_link byt_cht_es8316_dais[] = {
170         [MERR_DPCM_AUDIO] = {
171                 .name = "Audio Port",
172                 .stream_name = "Audio",
173                 .cpu_dai_name = "media-cpu-dai",
174                 .codec_dai_name = "snd-soc-dummy-dai",
175                 .codec_name = "snd-soc-dummy",
176                 .platform_name = "sst-mfld-platform",
177                 .nonatomic = true,
178                 .dynamic = 1,
179                 .dpcm_playback = 1,
180                 .dpcm_capture = 1,
181                 .ops = &byt_cht_es8316_aif1_ops,
182         },
183 
184         [MERR_DPCM_DEEP_BUFFER] = {
185                 .name = "Deep-Buffer Audio Port",
186                 .stream_name = "Deep-Buffer Audio",
187                 .cpu_dai_name = "deepbuffer-cpu-dai",
188                 .codec_dai_name = "snd-soc-dummy-dai",
189                 .codec_name = "snd-soc-dummy",
190                 .platform_name = "sst-mfld-platform",
191                 .nonatomic = true,
192                 .dynamic = 1,
193                 .dpcm_playback = 1,
194                 .ops = &byt_cht_es8316_aif1_ops,
195         },
196 
197                 /* back ends */
198         {
199                 /* Only SSP2 has been tested here, so BYT-CR platforms that
200                  * require SSP0 will not work.
201                  */
202                 .name = "SSP2-Codec",
203                 .id = 0,
204                 .cpu_dai_name = "ssp2-port",
205                 .platform_name = "sst-mfld-platform",
206                 .no_pcm = 1,
207                 .codec_dai_name = "ES8316 HiFi",
208                 .codec_name = "i2c-ESSX8316:00",
209                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
210                                                 | SND_SOC_DAIFMT_CBS_CFS,
211                 .be_hw_params_fixup = byt_cht_es8316_codec_fixup,
212                 .nonatomic = true,
213                 .dpcm_playback = 1,
214                 .dpcm_capture = 1,
215                 .init = byt_cht_es8316_init,
216         },
217 };
218 
219 
220 /* SoC card */
221 static struct snd_soc_card byt_cht_es8316_card = {
222         .name = "bytcht-es8316",
223         .owner = THIS_MODULE,
224         .dai_link = byt_cht_es8316_dais,
225         .num_links = ARRAY_SIZE(byt_cht_es8316_dais),
226         .dapm_widgets = byt_cht_es8316_widgets,
227         .num_dapm_widgets = ARRAY_SIZE(byt_cht_es8316_widgets),
228         .dapm_routes = byt_cht_es8316_audio_map,
229         .num_dapm_routes = ARRAY_SIZE(byt_cht_es8316_audio_map),
230         .controls = byt_cht_es8316_controls,
231         .num_controls = ARRAY_SIZE(byt_cht_es8316_controls),
232         .fully_routed = true,
233 };
234 
235 static char codec_name[SND_ACPI_I2C_ID_LEN];
236 
237 static int snd_byt_cht_es8316_mc_probe(struct platform_device *pdev)
238 {
239         struct byt_cht_es8316_private *priv;
240         struct snd_soc_acpi_mach *mach;
241         const char *i2c_name = NULL;
242         int dai_index = 0;
243         int i;
244         int ret = 0;
245 
246         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
247         if (!priv)
248                 return -ENOMEM;
249 
250         mach = (&pdev->dev)->platform_data;
251         /* fix index of codec dai */
252         for (i = 0; i < ARRAY_SIZE(byt_cht_es8316_dais); i++) {
253                 if (!strcmp(byt_cht_es8316_dais[i].codec_name,
254                             "i2c-ESSX8316:00")) {
255                         dai_index = i;
256                         break;
257                 }
258         }
259 
260         /* fixup codec name based on HID */
261         i2c_name = acpi_dev_get_first_match_name(mach->id, NULL, -1);
262         if (i2c_name) {
263                 snprintf(codec_name, sizeof(codec_name),
264                         "%s%s", "i2c-", i2c_name);
265                 byt_cht_es8316_dais[dai_index].codec_name = codec_name;
266         }
267 
268         /* register the soc card */
269         byt_cht_es8316_card.dev = &pdev->dev;
270         snd_soc_card_set_drvdata(&byt_cht_es8316_card, priv);
271 
272         priv->mclk = devm_clk_get(&pdev->dev, "pmc_plt_clk_3");
273         if (IS_ERR(priv->mclk)) {
274                 ret = PTR_ERR(priv->mclk);
275                 dev_err(&pdev->dev,
276                         "Failed to get MCLK from pmc_plt_clk_3: %d\n",
277                         ret);
278                 return ret;
279         }
280 
281         ret = devm_snd_soc_register_card(&pdev->dev, &byt_cht_es8316_card);
282         if (ret) {
283                 dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
284                 return ret;
285         }
286         platform_set_drvdata(pdev, &byt_cht_es8316_card);
287         return ret;
288 }
289 
290 static struct platform_driver snd_byt_cht_es8316_mc_driver = {
291         .driver = {
292                 .name = "bytcht_es8316",
293         },
294         .probe = snd_byt_cht_es8316_mc_probe,
295 };
296 
297 module_platform_driver(snd_byt_cht_es8316_mc_driver);
298 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail Machine driver");
299 MODULE_AUTHOR("David Yang <yangxiaohua@everest-semi.com>");
300 MODULE_LICENSE("GPL v2");
301 MODULE_ALIAS("platform:bytcht_es8316");
302 

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