--- /dev/null
+/*
+ * PCM1681 ASoC codec driver
+ *
+ * Copyright (c) StreamUnlimited GmbH 2013
+ * Marek Belisko <marek.belisko@streamunlimited.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#define PCM1681_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE)
+
+#define PCM1681_PCM_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
+ SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
+
+#define PCM1681_SOFT_MUTE_ALL 0xff
+#define PCM1681_DEEMPH_RATE_MASK 0x18
+#define PCM1681_DEEMPH_MASK 0x01
+
+#define PCM1681_ATT_CONTROL(X) (X <= 6 ? X : X + 9) /* Attenuation level */
+#define PCM1681_SOFT_MUTE 0x07 /* Soft mute control register */
+#define PCM1681_DAC_CONTROL 0x08 /* DAC operation control */
+#define PCM1681_FMT_CONTROL 0x09 /* Audio interface data format */
+#define PCM1681_DEEMPH_CONTROL 0x0a /* De-emphasis control */
+#define PCM1681_ZERO_DETECT_STATUS 0x0e /* Zero detect status reg */
+
+static const struct reg_default pcm1681_reg_defaults[] = {
+ { 0x01, 0xff },
+ { 0x02, 0xff },
+ { 0x03, 0xff },
+ { 0x04, 0xff },
+ { 0x05, 0xff },
+ { 0x06, 0xff },
+ { 0x07, 0x00 },
+ { 0x08, 0x00 },
+ { 0x09, 0x06 },
+ { 0x0A, 0x00 },
+ { 0x0B, 0xff },
+ { 0x0C, 0x0f },
+ { 0x0D, 0x00 },
+ { 0x10, 0xff },
+ { 0x11, 0xff },
+ { 0x12, 0x00 },
+ { 0x13, 0x00 },
+};
+
+static bool pcm1681_accessible_reg(struct device *dev, unsigned int reg)
+{
+ return !((reg == 0x00) || (reg == 0x0f));
+}
+
+static bool pcm1681_writeable_reg(struct device *dev, unsigned register reg)
+{
+ return pcm1681_accessible_reg(dev, reg) &&
+ (reg != PCM1681_ZERO_DETECT_STATUS);
+}
+
+struct pcm1681_private {
+ struct regmap *regmap;
+ unsigned int format;
+ /* Current deemphasis status */
+ unsigned int deemph;
+ /* Current rate for deemphasis control */
+ unsigned int rate;
+};
+
+static const int pcm1681_deemph[] = { 44100, 48000, 32000 };
+
+static int pcm1681_set_deemph(struct snd_soc_codec *codec)
+{
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+ int i = 0, val = -1, enable = 0;
+
+ if (priv->deemph)
+ for (i = 0; i < ARRAY_SIZE(pcm1681_deemph); i++)
+ if (pcm1681_deemph[i] == priv->rate)
+ val = i;
+
+ if (val != -1) {
+ regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
+ PCM1681_DEEMPH_RATE_MASK, val);
+ enable = 1;
+ } else
+ enable = 0;
+
+ /* enable/disable deemphasis functionality */
+ return regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
+ PCM1681_DEEMPH_MASK, enable);
+}
+
+static int pcm1681_get_deemph(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ ucontrol->value.enumerated.item[0] = priv->deemph;
+
+ return 0;
+}
+
+static int pcm1681_put_deemph(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ priv->deemph = ucontrol->value.enumerated.item[0];
+
+ return pcm1681_set_deemph(codec);
+}
+
+static int pcm1681_set_dai_fmt(struct snd_soc_dai *codec_dai,
+ unsigned int format)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ /* The PCM1681 can only be slave to all clocks */
+ if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+ dev_err(codec->dev, "Invalid clocking mode\n");
+ return -EINVAL;
+ }
+
+ priv->format = format;
+
+ return 0;
+}
+
+static int pcm1681_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+ int val;
+
+ if (mute)
+ val = PCM1681_SOFT_MUTE_ALL;
+ else
+ val = 0;
+
+ return regmap_write(priv->regmap, PCM1681_SOFT_MUTE, val);
+}
+
+static int pcm1681_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
+ int val = 0, ret;
+ int pcm_format = params_format(params);
+
+ priv->rate = params_rate(params);
+
+ switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_RIGHT_J:
+ if (pcm_format == SNDRV_PCM_FORMAT_S24_LE)
+ val = 0x00;
+ else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
+ val = 0x03;
+ break;
+ case SND_SOC_DAIFMT_I2S:
+ val = 0x04;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ val = 0x05;
+ break;
+ default:
+ dev_err(codec->dev, "Invalid DAI format\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(priv->regmap, PCM1681_FMT_CONTROL, 0x0f, val);
+ if (ret < 0)
+ return ret;
+
+ return pcm1681_set_deemph(codec);
+}
+
+static const struct snd_soc_dai_ops pcm1681_dai_ops = {
+ .set_fmt = pcm1681_set_dai_fmt,
+ .hw_params = pcm1681_hw_params,
+ .digital_mute = pcm1681_digital_mute,
+};
+
+static const DECLARE_TLV_DB_SCALE(pcm1681_dac_tlv, -6350, 50, 1);
+
+static const struct snd_kcontrol_new pcm1681_controls[] = {
+ SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
+ PCM1681_ATT_CONTROL(1), PCM1681_ATT_CONTROL(2), 0,
+ 0x7f, 0, pcm1681_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
+ PCM1681_ATT_CONTROL(3), PCM1681_ATT_CONTROL(4), 0,
+ 0x7f, 0, pcm1681_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
+ PCM1681_ATT_CONTROL(5), PCM1681_ATT_CONTROL(6), 0,
+ 0x7f, 0, pcm1681_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 7/8 Playback Volume",
+ PCM1681_ATT_CONTROL(7), PCM1681_ATT_CONTROL(8), 0,
+ 0x7f, 0, pcm1681_dac_tlv),
+ SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
+ pcm1681_get_deemph, pcm1681_put_deemph),
+};
+
+struct snd_soc_dai_driver pcm1681_dai = {
+ .name = "pcm1681-hifi",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 8,
+ .rates = PCM1681_PCM_RATES,
+ .formats = PCM1681_PCM_FORMATS,
+ },
+ .ops = &pcm1681_dai_ops,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id pcm1681_dt_ids[] = {
+ { .compatible = "ti,pcm1681", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pcm1681_dt_ids);
+#endif
+
+static const struct regmap_config pcm1681_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = ARRAY_SIZE(pcm1681_reg_defaults) + 1,
+ .reg_defaults = pcm1681_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(pcm1681_reg_defaults),
+ .writeable_reg = pcm1681_writeable_reg,
+ .readable_reg = pcm1681_accessible_reg,
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_pcm1681 = {
+ .controls = pcm1681_controls,
+ .num_controls = ARRAY_SIZE(pcm1681_controls),
+};
+
+static const struct i2c_device_id pcm1681_i2c_id[] = {
+ {"pcm1681", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, pcm1681_i2c_id);
+
+static int pcm1681_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct pcm1681_private *priv;
+
+ priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = devm_regmap_init_i2c(client, &pcm1681_regmap);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&client->dev, "Failed to create regmap: %d\n", ret);
+ return ret;
+ }
+
+ i2c_set_clientdata(client, priv);
+
+ return snd_soc_register_codec(&client->dev, &soc_codec_dev_pcm1681,
+ &pcm1681_dai, 1);
+}
+
+static int pcm1681_i2c_remove(struct i2c_client *client)
+{
+ snd_soc_unregister_codec(&client->dev);
+ return 0;
+}
+
+static struct i2c_driver pcm1681_i2c_driver = {
+ .driver = {
+ .name = "pcm1681",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pcm1681_dt_ids),
+ },
+ .id_table = pcm1681_i2c_id,
+ .probe = pcm1681_i2c_probe,
+ .remove = pcm1681_i2c_remove,
+};
+
+module_i2c_driver(pcm1681_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments PCM1681 ALSA SoC Codec Driver");
+MODULE_AUTHOR("Marek Belisko <marek.belisko@streamunlimited.com>");
+MODULE_LICENSE("GPL");
projects / ~andy / linux / commitdiff