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Linux/sound/soc/codecs/pcm179x.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * PCM179X ASoC codec driver
  4  *
  5  * Copyright (c) Amarula Solutions B.V. 2013
  6  *
  7  *     Michael Trimarchi <michael@amarulasolutions.com>
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/slab.h>
 12 #include <linux/kernel.h>
 13 #include <linux/device.h>
 14 
 15 #include <sound/core.h>
 16 #include <sound/pcm.h>
 17 #include <sound/pcm_params.h>
 18 #include <sound/initval.h>
 19 #include <sound/soc.h>
 20 #include <sound/tlv.h>
 21 #include <linux/of.h>
 22 
 23 #include "pcm179x.h"
 24 
 25 #define PCM179X_DAC_VOL_LEFT    0x10
 26 #define PCM179X_DAC_VOL_RIGHT   0x11
 27 #define PCM179X_FMT_CONTROL     0x12
 28 #define PCM179X_MODE_CONTROL    0x13
 29 #define PCM179X_SOFT_MUTE       PCM179X_FMT_CONTROL
 30 
 31 #define PCM179X_FMT_MASK        0x70
 32 #define PCM179X_FMT_SHIFT       4
 33 #define PCM179X_MUTE_MASK       0x01
 34 #define PCM179X_MUTE_SHIFT      0
 35 #define PCM179X_ATLD_ENABLE     (1 << 7)
 36 
 37 static const struct reg_default pcm179x_reg_defaults[] = {
 38         { 0x10, 0xff },
 39         { 0x11, 0xff },
 40         { 0x12, 0x50 },
 41         { 0x13, 0x00 },
 42         { 0x14, 0x00 },
 43         { 0x15, 0x01 },
 44         { 0x16, 0x00 },
 45         { 0x17, 0x00 },
 46 };
 47 
 48 static bool pcm179x_accessible_reg(struct device *dev, unsigned int reg)
 49 {
 50         return reg >= 0x10 && reg <= 0x17;
 51 }
 52 
 53 static bool pcm179x_writeable_reg(struct device *dev, unsigned int reg)
 54 {
 55         bool accessible;
 56 
 57         accessible = pcm179x_accessible_reg(dev, reg);
 58 
 59         return accessible && reg != 0x16 && reg != 0x17;
 60 }
 61 
 62 struct pcm179x_private {
 63         struct regmap *regmap;
 64         unsigned int format;
 65         unsigned int rate;
 66 };
 67 
 68 static int pcm179x_set_dai_fmt(struct snd_soc_dai *codec_dai,
 69                              unsigned int format)
 70 {
 71         struct snd_soc_component *component = codec_dai->component;
 72         struct pcm179x_private *priv = snd_soc_component_get_drvdata(component);
 73 
 74         priv->format = format;
 75 
 76         return 0;
 77 }
 78 
 79 static int pcm179x_digital_mute(struct snd_soc_dai *dai, int mute)
 80 {
 81         struct snd_soc_component *component = dai->component;
 82         struct pcm179x_private *priv = snd_soc_component_get_drvdata(component);
 83         int ret;
 84 
 85         ret = regmap_update_bits(priv->regmap, PCM179X_SOFT_MUTE,
 86                                  PCM179X_MUTE_MASK, !!mute);
 87         if (ret < 0)
 88                 return ret;
 89 
 90         return 0;
 91 }
 92 
 93 static int pcm179x_hw_params(struct snd_pcm_substream *substream,
 94                              struct snd_pcm_hw_params *params,
 95                              struct snd_soc_dai *dai)
 96 {
 97         struct snd_soc_component *component = dai->component;
 98         struct pcm179x_private *priv = snd_soc_component_get_drvdata(component);
 99         int val = 0, ret;
100 
101         priv->rate = params_rate(params);
102 
103         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
104         case SND_SOC_DAIFMT_RIGHT_J:
105                 switch (params_width(params)) {
106                 case 24:
107                 case 32:
108                         val = 2;
109                         break;
110                 case 16:
111                         val = 0;
112                         break;
113                 default:
114                         return -EINVAL;
115                 }
116                 break;
117         case SND_SOC_DAIFMT_I2S:
118                 switch (params_width(params)) {
119                 case 24:
120                 case 32:
121                         val = 5;
122                         break;
123                 case 16:
124                         val = 4;
125                         break;
126                 default:
127                         return -EINVAL;
128                 }
129                 break;
130         default:
131                 dev_err(component->dev, "Invalid DAI format\n");
132                 return -EINVAL;
133         }
134 
135         val = val << PCM179X_FMT_SHIFT | PCM179X_ATLD_ENABLE;
136 
137         ret = regmap_update_bits(priv->regmap, PCM179X_FMT_CONTROL,
138                                  PCM179X_FMT_MASK | PCM179X_ATLD_ENABLE, val);
139         if (ret < 0)
140                 return ret;
141 
142         return 0;
143 }
144 
145 static const struct snd_soc_dai_ops pcm179x_dai_ops = {
146         .set_fmt        = pcm179x_set_dai_fmt,
147         .hw_params      = pcm179x_hw_params,
148         .digital_mute   = pcm179x_digital_mute,
149 };
150 
151 static const DECLARE_TLV_DB_SCALE(pcm179x_dac_tlv, -12000, 50, 1);
152 
153 static const struct snd_kcontrol_new pcm179x_controls[] = {
154         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM179X_DAC_VOL_LEFT,
155                          PCM179X_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
156                          pcm179x_dac_tlv),
157         SOC_SINGLE("DAC Invert Output Switch", PCM179X_MODE_CONTROL, 7, 1, 0),
158         SOC_SINGLE("DAC Rolloff Filter Switch", PCM179X_MODE_CONTROL, 1, 1, 0),
159 };
160 
161 static const struct snd_soc_dapm_widget pcm179x_dapm_widgets[] = {
162 SND_SOC_DAPM_OUTPUT("IOUTL+"),
163 SND_SOC_DAPM_OUTPUT("IOUTL-"),
164 SND_SOC_DAPM_OUTPUT("IOUTR+"),
165 SND_SOC_DAPM_OUTPUT("IOUTR-"),
166 };
167 
168 static const struct snd_soc_dapm_route pcm179x_dapm_routes[] = {
169         { "IOUTL+", NULL, "Playback" },
170         { "IOUTL-", NULL, "Playback" },
171         { "IOUTR+", NULL, "Playback" },
172         { "IOUTR-", NULL, "Playback" },
173 };
174 
175 static struct snd_soc_dai_driver pcm179x_dai = {
176         .name = "pcm179x-hifi",
177         .playback = {
178                 .stream_name = "Playback",
179                 .channels_min = 2,
180                 .channels_max = 2,
181                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
182                 .rate_min = 10000,
183                 .rate_max = 200000,
184                 .formats = PCM1792A_FORMATS, },
185         .ops = &pcm179x_dai_ops,
186 };
187 
188 const struct regmap_config pcm179x_regmap_config = {
189         .reg_bits               = 8,
190         .val_bits               = 8,
191         .max_register           = 23,
192         .reg_defaults           = pcm179x_reg_defaults,
193         .num_reg_defaults       = ARRAY_SIZE(pcm179x_reg_defaults),
194         .writeable_reg          = pcm179x_writeable_reg,
195         .readable_reg           = pcm179x_accessible_reg,
196 };
197 EXPORT_SYMBOL_GPL(pcm179x_regmap_config);
198 
199 static const struct snd_soc_component_driver soc_component_dev_pcm179x = {
200         .controls               = pcm179x_controls,
201         .num_controls           = ARRAY_SIZE(pcm179x_controls),
202         .dapm_widgets           = pcm179x_dapm_widgets,
203         .num_dapm_widgets       = ARRAY_SIZE(pcm179x_dapm_widgets),
204         .dapm_routes            = pcm179x_dapm_routes,
205         .num_dapm_routes        = ARRAY_SIZE(pcm179x_dapm_routes),
206         .idle_bias_on           = 1,
207         .use_pmdown_time        = 1,
208         .endianness             = 1,
209         .non_legacy_dai_naming  = 1,
210 };
211 
212 int pcm179x_common_init(struct device *dev, struct regmap *regmap)
213 {
214         struct pcm179x_private *pcm179x;
215 
216         pcm179x = devm_kzalloc(dev, sizeof(struct pcm179x_private),
217                                 GFP_KERNEL);
218         if (!pcm179x)
219                 return -ENOMEM;
220 
221         pcm179x->regmap = regmap;
222         dev_set_drvdata(dev, pcm179x);
223 
224         return devm_snd_soc_register_component(dev,
225                         &soc_component_dev_pcm179x, &pcm179x_dai, 1);
226 }
227 EXPORT_SYMBOL_GPL(pcm179x_common_init);
228 
229 MODULE_DESCRIPTION("ASoC PCM179X driver");
230 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
231 MODULE_LICENSE("GPL");
232 

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