soc/codecs/pcm1789.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 // Audio driver for PCM1789
0003 // Copyright (C) 2018 Bootlin
0004 // Mylène Josserand <mylene.josserand@bootlin.com>
0005
0006 #include <linux/gpio/consumer.h>
0007 #include <linux/module.h>
0008 #include <linux/workqueue.h>
0009
0010 #include <sound/pcm_params.h>
0011 #include <sound/soc.h>
0012 #include <sound/tlv.h>
0013
0014 #include "pcm1789.h"
0015
0016 #define PCM1789_MUTE_CONTROL    0x10
0017 #define PCM1789_FMT_CONTROL 0x11
0018 #define PCM1789_SOFT_MUTE   0x14
0019 #define PCM1789_DAC_VOL_LEFT    0x18
0020 #define PCM1789_DAC_VOL_RIGHT   0x19
0021
0022 #define PCM1789_FMT_MASK    0x07
0023 #define PCM1789_MUTE_MASK   0x03
0024 #define PCM1789_MUTE_SRET   0x06
0025
0026 struct pcm1789_private {
0027     struct regmap *regmap;
0028     unsigned int format;
0029     unsigned int rate;
0030     struct gpio_desc *reset;
0031     struct work_struct work;
0032     struct device *dev;
0033 };
0034
0035 static const struct reg_default pcm1789_reg_defaults[] = {
0036     { PCM1789_FMT_CONTROL, 0x00 },
0037     { PCM1789_SOFT_MUTE, 0x00 },
0038     { PCM1789_DAC_VOL_LEFT, 0xff },
0039     { PCM1789_DAC_VOL_RIGHT, 0xff },
0040 };
0041
0042 static bool pcm1789_accessible_reg(struct device *dev, unsigned int reg)
0043 {
0044     return reg >= PCM1789_MUTE_CONTROL && reg <= PCM1789_DAC_VOL_RIGHT;
0045 }
0046
0047 static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg)
0048 {
0049     return pcm1789_accessible_reg(dev, reg);
0050 }
0051
0052 static int pcm1789_set_dai_fmt(struct snd_soc_dai *codec_dai,
0053                    unsigned int format)
0054 {
0055     struct snd_soc_component *component = codec_dai->component;
0056     struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
0057
0058     priv->format = format;
0059
0060     return 0;
0061 }
0062
0063 static int pcm1789_mute(struct snd_soc_dai *codec_dai, int mute, int direction)
0064 {
0065     struct snd_soc_component *component = codec_dai->component;
0066     struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
0067
0068     return regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
0069                   PCM1789_MUTE_MASK,
0070                   mute ? 0 : PCM1789_MUTE_MASK);
0071 }
0072
0073 static int pcm1789_hw_params(struct snd_pcm_substream *substream,
0074                  struct snd_pcm_hw_params *params,
0075                  struct snd_soc_dai *codec_dai)
0076 {
0077     struct snd_soc_component *component = codec_dai->component;
0078     struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
0079     int val = 0, ret;
0080
0081     priv->rate = params_rate(params);
0082
0083     switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
0084     case SND_SOC_DAIFMT_RIGHT_J:
0085         switch (params_width(params)) {
0086         case 24:
0087             val = 2;
0088             break;
0089         case 16:
0090             val = 3;
0091             break;
0092         default:
0093             return -EINVAL;
0094         }
0095         break;
0096     case SND_SOC_DAIFMT_I2S:
0097         switch (params_width(params)) {
0098         case 16:
0099         case 24:
0100         case 32:
0101             val = 0;
0102             break;
0103         default:
0104             return -EINVAL;
0105         }
0106         break;
0107     case SND_SOC_DAIFMT_LEFT_J:
0108         switch (params_width(params)) {
0109         case 16:
0110         case 24:
0111         case 32:
0112             val = 1;
0113             break;
0114         default:
0115             return -EINVAL;
0116         }
0117         break;
0118     default:
0119         dev_err(component->dev, "Invalid DAI format\n");
0120         return -EINVAL;
0121     }
0122
0123     ret = regmap_update_bits(priv->regmap, PCM1789_FMT_CONTROL,
0124                  PCM1789_FMT_MASK, val);
0125     if (ret < 0)
0126         return ret;
0127
0128     return 0;
0129 }
0130
0131 static void pcm1789_work_queue(struct work_struct *work)
0132 {
0133     struct pcm1789_private *priv = container_of(work,
0134                             struct pcm1789_private,
0135                             work);
0136
0137     /* Perform a software reset to remove codec from desynchronized state */
0138     if (regmap_update_bits(priv->regmap, PCM1789_MUTE_CONTROL,
0139                    0x3 << PCM1789_MUTE_SRET, 0) < 0)
0140         dev_err(priv->dev, "Error while setting SRET");
0141 }
0142
0143 static int pcm1789_trigger(struct snd_pcm_substream *substream, int cmd,
0144                struct snd_soc_dai *dai)
0145 {
0146     struct snd_soc_component *component = dai->component;
0147     struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
0148     int ret = 0;
0149
0150     switch (cmd) {
0151     case SNDRV_PCM_TRIGGER_START:
0152     case SNDRV_PCM_TRIGGER_RESUME:
0153     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
0154         schedule_work(&priv->work);
0155         break;
0156     case SNDRV_PCM_TRIGGER_STOP:
0157     case SNDRV_PCM_TRIGGER_SUSPEND:
0158     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
0159         break;
0160     default:
0161         ret = -EINVAL;
0162     }
0163
0164     return ret;
0165 }
0166
0167 static const struct snd_soc_dai_ops pcm1789_dai_ops = {
0168     .set_fmt    = pcm1789_set_dai_fmt,
0169     .hw_params  = pcm1789_hw_params,
0170     .mute_stream    = pcm1789_mute,
0171     .trigger    = pcm1789_trigger,
0172     .no_capture_mute = 1,
0173 };
0174
0175 static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1);
0176
0177 static const struct snd_kcontrol_new pcm1789_controls[] = {
0178     SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT,
0179                    PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
0180                    pcm1789_dac_tlv),
0181 };
0182
0183 static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = {
0184     SND_SOC_DAPM_OUTPUT("IOUTL+"),
0185     SND_SOC_DAPM_OUTPUT("IOUTL-"),
0186     SND_SOC_DAPM_OUTPUT("IOUTR+"),
0187     SND_SOC_DAPM_OUTPUT("IOUTR-"),
0188 };
0189
0190 static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = {
0191     { "IOUTL+", NULL, "Playback" },
0192     { "IOUTL-", NULL, "Playback" },
0193     { "IOUTR+", NULL, "Playback" },
0194     { "IOUTR-", NULL, "Playback" },
0195 };
0196
0197 static struct snd_soc_dai_driver pcm1789_dai = {
0198     .name = "pcm1789-hifi",
0199     .playback = {
0200         .stream_name = "Playback",
0201         .channels_min = 2,
0202         .channels_max = 2,
0203         .rates = SNDRV_PCM_RATE_CONTINUOUS,
0204         .rate_min = 10000,
0205         .rate_max = 200000,
0206         .formats = PCM1789_FORMATS,
0207     },
0208     .ops = &pcm1789_dai_ops,
0209 };
0210
0211 const struct regmap_config pcm1789_regmap_config = {
0212     .reg_bits       = 8,
0213     .val_bits       = 8,
0214     .max_register       = PCM1789_DAC_VOL_RIGHT,
0215     .reg_defaults       = pcm1789_reg_defaults,
0216     .num_reg_defaults   = ARRAY_SIZE(pcm1789_reg_defaults),
0217     .writeable_reg      = pcm1789_writeable_reg,
0218     .readable_reg       = pcm1789_accessible_reg,
0219 };
0220 EXPORT_SYMBOL_GPL(pcm1789_regmap_config);
0221
0222 static const struct snd_soc_component_driver soc_component_dev_pcm1789 = {
0223     .controls       = pcm1789_controls,
0224     .num_controls       = ARRAY_SIZE(pcm1789_controls),
0225     .dapm_widgets       = pcm1789_dapm_widgets,
0226     .num_dapm_widgets   = ARRAY_SIZE(pcm1789_dapm_widgets),
0227     .dapm_routes        = pcm1789_dapm_routes,
0228     .num_dapm_routes    = ARRAY_SIZE(pcm1789_dapm_routes),
0229     .idle_bias_on       = 1,
0230     .use_pmdown_time    = 1,
0231     .endianness     = 1,
0232 };
0233
0234 int pcm1789_common_init(struct device *dev, struct regmap *regmap)
0235 {
0236     struct pcm1789_private *pcm1789;
0237
0238     pcm1789 = devm_kzalloc(dev, sizeof(struct pcm1789_private),
0239                    GFP_KERNEL);
0240     if (!pcm1789)
0241         return -ENOMEM;
0242
0243     pcm1789->regmap = regmap;
0244     pcm1789->dev = dev;
0245     dev_set_drvdata(dev, pcm1789);
0246
0247     pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
0248     if (IS_ERR(pcm1789->reset))
0249         return PTR_ERR(pcm1789->reset);
0250
0251     gpiod_set_value_cansleep(pcm1789->reset, 0);
0252     msleep(300);
0253
0254     INIT_WORK(&pcm1789->work, pcm1789_work_queue);
0255
0256     return devm_snd_soc_register_component(dev, &soc_component_dev_pcm1789,
0257                            &pcm1789_dai, 1);
0258 }
0259 EXPORT_SYMBOL_GPL(pcm1789_common_init);
0260
0261 void pcm1789_common_exit(struct device *dev)
0262 {
0263     struct pcm1789_private *priv = dev_get_drvdata(dev);
0264
0265     flush_work(&priv->work);
0266 }
0267 EXPORT_SYMBOL_GPL(pcm1789_common_exit);
0268
0269 MODULE_DESCRIPTION("ASoC PCM1789 driver");
0270 MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
0271 MODULE_LICENSE("GPL");