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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_SOFT_MUTE      PCM1792A_FMT_CONTROL
 40 
 41 #define PCM1792A_FMT_MASK       0x70
 42 #define PCM1792A_FMT_SHIFT      4
 43 #define PCM1792A_MUTE_MASK      0x01
 44 #define PCM1792A_MUTE_SHIFT     0
 45 #define PCM1792A_ATLD_ENABLE    (1 << 7)
 46 
 47 static const struct reg_default pcm1792a_reg_defaults[] = {
 48         { 0x10, 0xff },
 49         { 0x11, 0xff },
 50         { 0x12, 0x50 },
 51         { 0x13, 0x00 },
 52         { 0x14, 0x00 },
 53         { 0x15, 0x01 },
 54         { 0x16, 0x00 },
 55         { 0x17, 0x00 },
 56 };
 57 
 58 static bool pcm1792a_accessible_reg(struct device *dev, unsigned int reg)
 59 {
 60         return reg >= 0x10 && reg <= 0x17;
 61 }
 62 
 63 static bool pcm1792a_writeable_reg(struct device *dev, unsigned register reg)
 64 {
 65         bool accessible;
 66 
 67         accessible = pcm1792a_accessible_reg(dev, reg);
 68 
 69         return accessible && reg != 0x16 && reg != 0x17;
 70 }
 71 
 72 struct pcm1792a_private {
 73         struct regmap *regmap;
 74         unsigned int format;
 75         unsigned int rate;
 76 };
 77 
 78 static int pcm1792a_set_dai_fmt(struct snd_soc_dai *codec_dai,
 79                              unsigned int format)
 80 {
 81         struct snd_soc_codec *codec = codec_dai->codec;
 82         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 83 
 84         priv->format = format;
 85 
 86         return 0;
 87 }
 88 
 89 static int pcm1792a_digital_mute(struct snd_soc_dai *dai, int mute)
 90 {
 91         struct snd_soc_codec *codec = dai->codec;
 92         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 93         int ret;
 94 
 95         ret = regmap_update_bits(priv->regmap, PCM1792A_SOFT_MUTE,
 96                                  PCM1792A_MUTE_MASK, !!mute);
 97         if (ret < 0)
 98                 return ret;
 99 
100         return 0;
101 }
102 
103 static int pcm1792a_hw_params(struct snd_pcm_substream *substream,
104                              struct snd_pcm_hw_params *params,
105                              struct snd_soc_dai *dai)
106 {
107         struct snd_soc_codec *codec = dai->codec;
108         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
109         int val = 0, ret;
110         int pcm_format = params_format(params);
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                 if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
117                     pcm_format == SNDRV_PCM_FORMAT_S32_LE)
118                         val = 0x02;
119                 else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
120                         val = 0x00;
121                 break;
122         case SND_SOC_DAIFMT_I2S:
123                 if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
124                     pcm_format == SNDRV_PCM_FORMAT_S32_LE)
125                         val = 0x05;
126                 else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
127                         val = 0x04;
128                 break;
129         default:
130                 dev_err(codec->dev, "Invalid DAI format\n");
131                 return -EINVAL;
132         }
133 
134         val = val << PCM1792A_FMT_SHIFT | PCM1792A_ATLD_ENABLE;
135 
136         ret = regmap_update_bits(priv->regmap, PCM1792A_FMT_CONTROL,
137                                  PCM1792A_FMT_MASK | PCM1792A_ATLD_ENABLE, val);
138         if (ret < 0)
139                 return ret;
140 
141         return 0;
142 }
143 
144 static const struct snd_soc_dai_ops pcm1792a_dai_ops = {
145         .set_fmt        = pcm1792a_set_dai_fmt,
146         .hw_params      = pcm1792a_hw_params,
147         .digital_mute   = pcm1792a_digital_mute,
148 };
149 
150 static const DECLARE_TLV_DB_SCALE(pcm1792a_dac_tlv, -12000, 50, 1);
151 
152 static const struct snd_kcontrol_new pcm1792a_controls[] = {
153         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1792A_DAC_VOL_LEFT,
154                          PCM1792A_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
155                          pcm1792a_dac_tlv),
156 };
157 
158 static const struct snd_soc_dapm_widget pcm1792a_dapm_widgets[] = {
159 SND_SOC_DAPM_OUTPUT("IOUTL+"),
160 SND_SOC_DAPM_OUTPUT("IOUTL-"),
161 SND_SOC_DAPM_OUTPUT("IOUTR+"),
162 SND_SOC_DAPM_OUTPUT("IOUTR-"),
163 };
164 
165 static const struct snd_soc_dapm_route pcm1792a_dapm_routes[] = {
166         { "IOUTL+", NULL, "Playback" },
167         { "IOUTL-", NULL, "Playback" },
168         { "IOUTR+", NULL, "Playback" },
169         { "IOUTR-", NULL, "Playback" },
170 };
171 
172 static struct snd_soc_dai_driver pcm1792a_dai = {
173         .name = "pcm1792a-hifi",
174         .playback = {
175                 .stream_name = "Playback",
176                 .channels_min = 2,
177                 .channels_max = 2,
178                 .rates = PCM1792A_RATES,
179                 .formats = PCM1792A_FORMATS, },
180         .ops = &pcm1792a_dai_ops,
181 };
182 
183 static const struct of_device_id pcm1792a_of_match[] = {
184         { .compatible = "ti,pcm1792a", },
185         { }
186 };
187 MODULE_DEVICE_TABLE(of, pcm1792a_of_match);
188 
189 static const struct regmap_config pcm1792a_regmap = {
190         .reg_bits               = 8,
191         .val_bits               = 8,
192         .max_register           = 23,
193         .reg_defaults           = pcm1792a_reg_defaults,
194         .num_reg_defaults       = ARRAY_SIZE(pcm1792a_reg_defaults),
195         .writeable_reg          = pcm1792a_writeable_reg,
196         .readable_reg           = pcm1792a_accessible_reg,
197 };
198 
199 static struct snd_soc_codec_driver soc_codec_dev_pcm1792a = {
200         .controls               = pcm1792a_controls,
201         .num_controls           = ARRAY_SIZE(pcm1792a_controls),
202         .dapm_widgets           = pcm1792a_dapm_widgets,
203         .num_dapm_widgets       = ARRAY_SIZE(pcm1792a_dapm_widgets),
204         .dapm_routes            = pcm1792a_dapm_routes,
205         .num_dapm_routes        = ARRAY_SIZE(pcm1792a_dapm_routes),
206 };
207 
208 static int pcm1792a_spi_probe(struct spi_device *spi)
209 {
210         struct pcm1792a_private *pcm1792a;
211         int ret;
212 
213         pcm1792a = devm_kzalloc(&spi->dev, sizeof(struct pcm1792a_private),
214                                 GFP_KERNEL);
215         if (!pcm1792a)
216                 return -ENOMEM;
217 
218         spi_set_drvdata(spi, pcm1792a);
219 
220         pcm1792a->regmap = devm_regmap_init_spi(spi, &pcm1792a_regmap);
221         if (IS_ERR(pcm1792a->regmap)) {
222                 ret = PTR_ERR(pcm1792a->regmap);
223                 dev_err(&spi->dev, "Failed to register regmap: %d\n", ret);
224                 return ret;
225         }
226 
227         return snd_soc_register_codec(&spi->dev,
228                         &soc_codec_dev_pcm1792a, &pcm1792a_dai, 1);
229 }
230 
231 static int pcm1792a_spi_remove(struct spi_device *spi)
232 {
233         snd_soc_unregister_codec(&spi->dev);
234         return 0;
235 }
236 
237 static const struct spi_device_id pcm1792a_spi_ids[] = {
238         { "pcm1792a", 0 },
239         { },
240 };
241 MODULE_DEVICE_TABLE(spi, pcm1792a_spi_ids);
242 
243 static struct spi_driver pcm1792a_codec_driver = {
244         .driver = {
245                 .name = "pcm1792a",
246                 .owner = THIS_MODULE,
247                 .of_match_table = of_match_ptr(pcm1792a_of_match),
248         },
249         .id_table = pcm1792a_spi_ids,
250         .probe = pcm1792a_spi_probe,
251         .remove = pcm1792a_spi_remove,
252 };
253 
254 module_spi_driver(pcm1792a_codec_driver);
255 
256 MODULE_DESCRIPTION("ASoC PCM1792A driver");
257 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
258 MODULE_LICENSE("GPL");
259 

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