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Linux/sound/soc/codecs/pcm1792a.c

  1 /*
  2  * PCM1792A ASoC codec driver
  3  *
  4  * Copyright (c) Amarula Solutions B.V. 2013
  5  *
  6  *     Michael Trimarchi <michael@amarulasolutions.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License
 10  * as published by the Free Software Foundation; either version 2
 11  * of the License, or (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  */
 18 
 19 #include <linux/module.h>
 20 #include <linux/slab.h>
 21 #include <linux/kernel.h>
 22 #include <linux/device.h>
 23 #include <linux/spi/spi.h>
 24 
 25 #include <sound/core.h>
 26 #include <sound/pcm.h>
 27 #include <sound/pcm_params.h>
 28 #include <sound/initval.h>
 29 #include <sound/soc.h>
 30 #include <sound/tlv.h>
 31 #include <linux/of.h>
 32 #include <linux/of_device.h>
 33 
 34 #include "pcm1792a.h"
 35 
 36 #define PCM1792A_DAC_VOL_LEFT   0x10
 37 #define PCM1792A_DAC_VOL_RIGHT  0x11
 38 #define PCM1792A_FMT_CONTROL    0x12
 39 #define PCM1792A_MODE_CONTROL   0x13
 40 #define PCM1792A_SOFT_MUTE      PCM1792A_FMT_CONTROL
 41 
 42 #define PCM1792A_FMT_MASK       0x70
 43 #define PCM1792A_FMT_SHIFT      4
 44 #define PCM1792A_MUTE_MASK      0x01
 45 #define PCM1792A_MUTE_SHIFT     0
 46 #define PCM1792A_ATLD_ENABLE    (1 << 7)
 47 
 48 static const struct reg_default pcm1792a_reg_defaults[] = {
 49         { 0x10, 0xff },
 50         { 0x11, 0xff },
 51         { 0x12, 0x50 },
 52         { 0x13, 0x00 },
 53         { 0x14, 0x00 },
 54         { 0x15, 0x01 },
 55         { 0x16, 0x00 },
 56         { 0x17, 0x00 },
 57 };
 58 
 59 static bool pcm1792a_accessible_reg(struct device *dev, unsigned int reg)
 60 {
 61         return reg >= 0x10 && reg <= 0x17;
 62 }
 63 
 64 static bool pcm1792a_writeable_reg(struct device *dev, unsigned register reg)
 65 {
 66         bool accessible;
 67 
 68         accessible = pcm1792a_accessible_reg(dev, reg);
 69 
 70         return accessible && reg != 0x16 && reg != 0x17;
 71 }
 72 
 73 struct pcm1792a_private {
 74         struct regmap *regmap;
 75         unsigned int format;
 76         unsigned int rate;
 77 };
 78 
 79 static int pcm1792a_set_dai_fmt(struct snd_soc_dai *codec_dai,
 80                              unsigned int format)
 81 {
 82         struct snd_soc_codec *codec = codec_dai->codec;
 83         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 84 
 85         priv->format = format;
 86 
 87         return 0;
 88 }
 89 
 90 static int pcm1792a_digital_mute(struct snd_soc_dai *dai, int mute)
 91 {
 92         struct snd_soc_codec *codec = dai->codec;
 93         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 94         int ret;
 95 
 96         ret = regmap_update_bits(priv->regmap, PCM1792A_SOFT_MUTE,
 97                                  PCM1792A_MUTE_MASK, !!mute);
 98         if (ret < 0)
 99                 return ret;
100 
101         return 0;
102 }
103 
104 static int pcm1792a_hw_params(struct snd_pcm_substream *substream,
105                              struct snd_pcm_hw_params *params,
106                              struct snd_soc_dai *dai)
107 {
108         struct snd_soc_codec *codec = dai->codec;
109         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
110         int val = 0, ret;
111 
112         priv->rate = params_rate(params);
113 
114         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
115         case SND_SOC_DAIFMT_RIGHT_J:
116                 switch (params_width(params)) {
117                 case 24:
118                 case 32:
119                         val = 2;
120                         break;
121                 case 16:
122                         val = 0;
123                         break;
124                 default:
125                         return -EINVAL;
126                 }
127                 break;
128         case SND_SOC_DAIFMT_I2S:
129                 switch (params_width(params)) {
130                 case 24:
131                 case 32:
132                         val = 5;
133                         break;
134                 case 16:
135                         val = 4;
136                         break;
137                 default:
138                         return -EINVAL;
139                 }
140                 break;
141         default:
142                 dev_err(codec->dev, "Invalid DAI format\n");
143                 return -EINVAL;
144         }
145 
146         val = val << PCM1792A_FMT_SHIFT | PCM1792A_ATLD_ENABLE;
147 
148         ret = regmap_update_bits(priv->regmap, PCM1792A_FMT_CONTROL,
149                                  PCM1792A_FMT_MASK | PCM1792A_ATLD_ENABLE, val);
150         if (ret < 0)
151                 return ret;
152 
153         return 0;
154 }
155 
156 static const struct snd_soc_dai_ops pcm1792a_dai_ops = {
157         .set_fmt        = pcm1792a_set_dai_fmt,
158         .hw_params      = pcm1792a_hw_params,
159         .digital_mute   = pcm1792a_digital_mute,
160 };
161 
162 static const DECLARE_TLV_DB_SCALE(pcm1792a_dac_tlv, -12000, 50, 1);
163 
164 static const struct snd_kcontrol_new pcm1792a_controls[] = {
165         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1792A_DAC_VOL_LEFT,
166                          PCM1792A_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
167                          pcm1792a_dac_tlv),
168         SOC_SINGLE("DAC Invert Output Switch", PCM1792A_MODE_CONTROL, 7, 1, 0),
169         SOC_SINGLE("DAC Rolloff Filter Switch", PCM1792A_MODE_CONTROL, 1, 1, 0),
170 };
171 
172 static const struct snd_soc_dapm_widget pcm1792a_dapm_widgets[] = {
173 SND_SOC_DAPM_OUTPUT("IOUTL+"),
174 SND_SOC_DAPM_OUTPUT("IOUTL-"),
175 SND_SOC_DAPM_OUTPUT("IOUTR+"),
176 SND_SOC_DAPM_OUTPUT("IOUTR-"),
177 };
178 
179 static const struct snd_soc_dapm_route pcm1792a_dapm_routes[] = {
180         { "IOUTL+", NULL, "Playback" },
181         { "IOUTL-", NULL, "Playback" },
182         { "IOUTR+", NULL, "Playback" },
183         { "IOUTR-", NULL, "Playback" },
184 };
185 
186 static struct snd_soc_dai_driver pcm1792a_dai = {
187         .name = "pcm1792a-hifi",
188         .playback = {
189                 .stream_name = "Playback",
190                 .channels_min = 2,
191                 .channels_max = 2,
192                 .rates = PCM1792A_RATES,
193                 .formats = PCM1792A_FORMATS, },
194         .ops = &pcm1792a_dai_ops,
195 };
196 
197 static const struct of_device_id pcm1792a_of_match[] = {
198         { .compatible = "ti,pcm1792a", },
199         { }
200 };
201 MODULE_DEVICE_TABLE(of, pcm1792a_of_match);
202 
203 static const struct regmap_config pcm1792a_regmap = {
204         .reg_bits               = 8,
205         .val_bits               = 8,
206         .max_register           = 23,
207         .reg_defaults           = pcm1792a_reg_defaults,
208         .num_reg_defaults       = ARRAY_SIZE(pcm1792a_reg_defaults),
209         .writeable_reg          = pcm1792a_writeable_reg,
210         .readable_reg           = pcm1792a_accessible_reg,
211 };
212 
213 static struct snd_soc_codec_driver soc_codec_dev_pcm1792a = {
214         .controls               = pcm1792a_controls,
215         .num_controls           = ARRAY_SIZE(pcm1792a_controls),
216         .dapm_widgets           = pcm1792a_dapm_widgets,
217         .num_dapm_widgets       = ARRAY_SIZE(pcm1792a_dapm_widgets),
218         .dapm_routes            = pcm1792a_dapm_routes,
219         .num_dapm_routes        = ARRAY_SIZE(pcm1792a_dapm_routes),
220 };
221 
222 static int pcm1792a_spi_probe(struct spi_device *spi)
223 {
224         struct pcm1792a_private *pcm1792a;
225         int ret;
226 
227         pcm1792a = devm_kzalloc(&spi->dev, sizeof(struct pcm1792a_private),
228                                 GFP_KERNEL);
229         if (!pcm1792a)
230                 return -ENOMEM;
231 
232         spi_set_drvdata(spi, pcm1792a);
233 
234         pcm1792a->regmap = devm_regmap_init_spi(spi, &pcm1792a_regmap);
235         if (IS_ERR(pcm1792a->regmap)) {
236                 ret = PTR_ERR(pcm1792a->regmap);
237                 dev_err(&spi->dev, "Failed to register regmap: %d\n", ret);
238                 return ret;
239         }
240 
241         return snd_soc_register_codec(&spi->dev,
242                         &soc_codec_dev_pcm1792a, &pcm1792a_dai, 1);
243 }
244 
245 static int pcm1792a_spi_remove(struct spi_device *spi)
246 {
247         snd_soc_unregister_codec(&spi->dev);
248         return 0;
249 }
250 
251 static const struct spi_device_id pcm1792a_spi_ids[] = {
252         { "pcm1792a", 0 },
253         { },
254 };
255 MODULE_DEVICE_TABLE(spi, pcm1792a_spi_ids);
256 
257 static struct spi_driver pcm1792a_codec_driver = {
258         .driver = {
259                 .name = "pcm1792a",
260                 .owner = THIS_MODULE,
261                 .of_match_table = of_match_ptr(pcm1792a_of_match),
262         },
263         .id_table = pcm1792a_spi_ids,
264         .probe = pcm1792a_spi_probe,
265         .remove = pcm1792a_spi_remove,
266 };
267 
268 module_spi_driver(pcm1792a_codec_driver);
269 
270 MODULE_DESCRIPTION("ASoC PCM1792A driver");
271 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
272 MODULE_LICENSE("GPL");
273 

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