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Linux/sound/soc/codecs/si476x.c

  1 /*
  2  * sound/soc/codecs/si476x.c -- Codec driver for SI476X chips
  3  *
  4  * Copyright (C) 2012 Innovative Converged Devices(ICD)
  5  * Copyright (C) 2013 Andrey Smirnov
  6  *
  7  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; version 2 of the License.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16  * General Public License for more details.
 17  *
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/slab.h>
 22 #include <sound/pcm.h>
 23 #include <sound/pcm_params.h>
 24 #include <linux/regmap.h>
 25 #include <sound/soc.h>
 26 #include <sound/initval.h>
 27 
 28 #include <linux/i2c.h>
 29 
 30 #include <linux/mfd/si476x-core.h>
 31 
 32 enum si476x_audio_registers {
 33         SI476X_DIGITAL_IO_OUTPUT_FORMAT         = 0x0203,
 34         SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE    = 0x0202,
 35 };
 36 
 37 enum si476x_digital_io_output_format {
 38         SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT       = 11,
 39         SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT     = 8,
 40 };
 41 
 42 #define SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK     ((0x7 << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) | \
 43                                                   (0x7 << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT))
 44 #define SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK    (0x7e)
 45 
 46 enum si476x_daudio_formats {
 47         SI476X_DAUDIO_MODE_I2S          = (0x0 << 1),
 48         SI476X_DAUDIO_MODE_DSP_A        = (0x6 << 1),
 49         SI476X_DAUDIO_MODE_DSP_B        = (0x7 << 1),
 50         SI476X_DAUDIO_MODE_LEFT_J       = (0x8 << 1),
 51         SI476X_DAUDIO_MODE_RIGHT_J      = (0x9 << 1),
 52 
 53         SI476X_DAUDIO_MODE_IB           = (1 << 5),
 54         SI476X_DAUDIO_MODE_IF           = (1 << 6),
 55 };
 56 
 57 enum si476x_pcm_format {
 58         SI476X_PCM_FORMAT_S8            = 2,
 59         SI476X_PCM_FORMAT_S16_LE        = 4,
 60         SI476X_PCM_FORMAT_S20_3LE       = 5,
 61         SI476X_PCM_FORMAT_S24_LE        = 6,
 62 };
 63 
 64 static const struct snd_soc_dapm_widget si476x_dapm_widgets[] = {
 65 SND_SOC_DAPM_OUTPUT("LOUT"),
 66 SND_SOC_DAPM_OUTPUT("ROUT"),
 67 };
 68 
 69 static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
 70         { "Capture", NULL, "LOUT" },
 71         { "Capture", NULL, "ROUT" },
 72 };
 73 
 74 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
 75                                     unsigned int fmt)
 76 {
 77         struct si476x_core *core = i2c_mfd_cell_to_core(codec_dai->dev);
 78         int err;
 79         u16 format = 0;
 80 
 81         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 82                 return -EINVAL;
 83 
 84         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 85         case SND_SOC_DAIFMT_DSP_A:
 86                 format |= SI476X_DAUDIO_MODE_DSP_A;
 87                 break;
 88         case SND_SOC_DAIFMT_DSP_B:
 89                 format |= SI476X_DAUDIO_MODE_DSP_B;
 90                 break;
 91         case SND_SOC_DAIFMT_I2S:
 92                 format |= SI476X_DAUDIO_MODE_I2S;
 93                 break;
 94         case SND_SOC_DAIFMT_RIGHT_J:
 95                 format |= SI476X_DAUDIO_MODE_RIGHT_J;
 96                 break;
 97         case SND_SOC_DAIFMT_LEFT_J:
 98                 format |= SI476X_DAUDIO_MODE_LEFT_J;
 99                 break;
100         default:
101                 return -EINVAL;
102         }
103 
104         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
105         case SND_SOC_DAIFMT_DSP_A:
106         case SND_SOC_DAIFMT_DSP_B:
107                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
108                 case SND_SOC_DAIFMT_NB_NF:
109                         break;
110                 case SND_SOC_DAIFMT_IB_NF:
111                         format |= SI476X_DAUDIO_MODE_IB;
112                         break;
113                 default:
114                         return -EINVAL;
115                 }
116                 break;
117         case SND_SOC_DAIFMT_I2S:
118         case SND_SOC_DAIFMT_RIGHT_J:
119         case SND_SOC_DAIFMT_LEFT_J:
120                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
121                 case SND_SOC_DAIFMT_NB_NF:
122                         break;
123                 case SND_SOC_DAIFMT_IB_IF:
124                         format |= SI476X_DAUDIO_MODE_IB |
125                                 SI476X_DAUDIO_MODE_IF;
126                         break;
127                 case SND_SOC_DAIFMT_IB_NF:
128                         format |= SI476X_DAUDIO_MODE_IB;
129                         break;
130                 case SND_SOC_DAIFMT_NB_IF:
131                         format |= SI476X_DAUDIO_MODE_IF;
132                         break;
133                 default:
134                         return -EINVAL;
135                 }
136                 break;
137         default:
138                 return -EINVAL;
139         }
140 
141         si476x_core_lock(core);
142 
143         err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
144                                   SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
145                                   format);
146 
147         si476x_core_unlock(core);
148 
149         if (err < 0) {
150                 dev_err(codec_dai->codec->dev, "Failed to set output format\n");
151                 return err;
152         }
153 
154         return 0;
155 }
156 
157 static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
158                                   struct snd_pcm_hw_params *params,
159                                   struct snd_soc_dai *dai)
160 {
161         struct si476x_core *core = i2c_mfd_cell_to_core(dai->dev);
162         int rate, width, err;
163 
164         rate = params_rate(params);
165         if (rate < 32000 || rate > 48000) {
166                 dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
167                 return -EINVAL;
168         }
169 
170         switch (params_format(params)) {
171         case SNDRV_PCM_FORMAT_S8:
172                 width = SI476X_PCM_FORMAT_S8;
173                 break;
174         case SNDRV_PCM_FORMAT_S16_LE:
175                 width = SI476X_PCM_FORMAT_S16_LE;
176                 break;
177         case SNDRV_PCM_FORMAT_S20_3LE:
178                 width = SI476X_PCM_FORMAT_S20_3LE;
179                 break;
180         case SNDRV_PCM_FORMAT_S24_LE:
181                 width = SI476X_PCM_FORMAT_S24_LE;
182                 break;
183         default:
184                 return -EINVAL;
185         }
186 
187         si476x_core_lock(core);
188 
189         err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
190                             rate);
191         if (err < 0) {
192                 dev_err(dai->codec->dev, "Failed to set sample rate\n");
193                 goto out;
194         }
195 
196         err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
197                                   SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
198                                   (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
199                                   (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
200         if (err < 0) {
201                 dev_err(dai->codec->dev, "Failed to set output width\n");
202                 goto out;
203         }
204 
205 out:
206         si476x_core_unlock(core);
207 
208         return err;
209 }
210 
211 static struct snd_soc_dai_ops si476x_dai_ops = {
212         .hw_params      = si476x_codec_hw_params,
213         .set_fmt        = si476x_codec_set_dai_fmt,
214 };
215 
216 static struct snd_soc_dai_driver si476x_dai = {
217         .name           = "si476x-codec",
218         .capture        = {
219                 .stream_name    = "Capture",
220                 .channels_min   = 2,
221                 .channels_max   = 2,
222 
223                 .rates = SNDRV_PCM_RATE_32000 |
224                 SNDRV_PCM_RATE_44100 |
225                 SNDRV_PCM_RATE_48000,
226                 .formats = SNDRV_PCM_FMTBIT_S8 |
227                 SNDRV_PCM_FMTBIT_S16_LE |
228                 SNDRV_PCM_FMTBIT_S20_3LE |
229                 SNDRV_PCM_FMTBIT_S24_LE
230         },
231         .ops            = &si476x_dai_ops,
232 };
233 
234 static struct regmap *si476x_get_regmap(struct device *dev)
235 {
236         return dev_get_regmap(dev->parent, NULL);
237 }
238 
239 static struct snd_soc_codec_driver soc_codec_dev_si476x = {
240         .get_regmap = si476x_get_regmap,
241         .dapm_widgets = si476x_dapm_widgets,
242         .num_dapm_widgets = ARRAY_SIZE(si476x_dapm_widgets),
243         .dapm_routes = si476x_dapm_routes,
244         .num_dapm_routes = ARRAY_SIZE(si476x_dapm_routes),
245 };
246 
247 static int si476x_platform_probe(struct platform_device *pdev)
248 {
249         return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
250                                       &si476x_dai, 1);
251 }
252 
253 static int si476x_platform_remove(struct platform_device *pdev)
254 {
255         snd_soc_unregister_codec(&pdev->dev);
256         return 0;
257 }
258 
259 MODULE_ALIAS("platform:si476x-codec");
260 
261 static struct platform_driver si476x_platform_driver = {
262         .driver         = {
263                 .name   = "si476x-codec",
264                 .owner  = THIS_MODULE,
265         },
266         .probe          = si476x_platform_probe,
267         .remove         = si476x_platform_remove,
268 };
269 module_platform_driver(si476x_platform_driver);
270 
271 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
272 MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
273 MODULE_LICENSE("GPL");
274 

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