--- /dev/null
+/*
+ * wm8728.c -- WM8728 ALSA SoC Audio driver
+ *
+ * Copyright 2008 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+
+#include "wm8728.h"
+
+/*
+ * We can't read the WM8728 register space so we cache them instead.
+ * Note that the defaults here aren't the physical defaults, we latch
+ * the volume update bits, mute the output and enable infinite zero
+ * detect.
+ */
+static const struct reg_default wm8728_reg_defaults[] = {
+ { 0, 0x1ff },
+ { 1, 0x1ff },
+ { 2, 0x001 },
+ { 3, 0x100 },
+};
+
+/* codec private data */
+struct wm8728_priv {
+ struct regmap *regmap;
+};
+
+static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
+
+static const struct snd_kcontrol_new wm8728_snd_controls[] = {
+
+SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
+ 0, 255, 0, wm8728_tlv),
+
+SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
+};
+
+/*
+ * DAPM controls.
+ */
+static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
+SND_SOC_DAPM_OUTPUT("VOUTL"),
+SND_SOC_DAPM_OUTPUT("VOUTR"),
+};
+
+static const struct snd_soc_dapm_route wm8728_intercon[] = {
+ {"VOUTL", NULL, "DAC"},
+ {"VOUTR", NULL, "DAC"},
+};
+
+static int wm8728_mute(struct snd_soc_dai *dai, int mute)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
+
+ if (mute)
+ snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
+ else
+ snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
+
+ return 0;
+}
+
+static int wm8728_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;
+ u16 dac = snd_soc_read(codec, WM8728_DACCTL);
+
+ dac &= ~0x18;
+
+ switch (params_width(params)) {
+ case 16:
+ break;
+ case 20:
+ dac |= 0x10;
+ break;
+ case 24:
+ dac |= 0x08;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ snd_soc_write(codec, WM8728_DACCTL, dac);
+
+ return 0;
+}
+
+static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
+ unsigned int fmt)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ u16 iface = snd_soc_read(codec, WM8728_IFCTL);
+
+ /* Currently only I2S is supported by the driver, though the
+ * hardware is more flexible.
+ */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ iface |= 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* The hardware only support full slave mode */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ iface &= ~0x22;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ iface |= 0x20;
+ iface &= ~0x02;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ iface |= 0x02;
+ iface &= ~0x20;
+ break;
+ case SND_SOC_DAIFMT_IB_IF:
+ iface |= 0x22;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ snd_soc_write(codec, WM8728_IFCTL, iface);
+ return 0;
+}
+
+static int wm8728_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
+ u16 reg;
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ case SND_SOC_BIAS_PREPARE:
+ case SND_SOC_BIAS_STANDBY:
+ if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+ /* Power everything up... */
+ reg = snd_soc_read(codec, WM8728_DACCTL);
+ snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
+
+ /* ..then sync in the register cache. */
+ regcache_sync(wm8728->regmap);
+ }
+ break;
+
+ case SND_SOC_BIAS_OFF:
+ reg = snd_soc_read(codec, WM8728_DACCTL);
+ snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
+ break;
+ }
+ codec->dapm.bias_level = level;
+ return 0;
+}
+
+#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
+
+#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+ SNDRV_PCM_FMTBIT_S24_LE)
+
+static const struct snd_soc_dai_ops wm8728_dai_ops = {
+ .hw_params = wm8728_hw_params,
+ .digital_mute = wm8728_mute,
+ .set_fmt = wm8728_set_dai_fmt,
+};
+
+static struct snd_soc_dai_driver wm8728_dai = {
+ .name = "wm8728-hifi",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = WM8728_RATES,
+ .formats = WM8728_FORMATS,
+ },
+ .ops = &wm8728_dai_ops,
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
+ .set_bias_level = wm8728_set_bias_level,
+ .suspend_bias_off = true,
+
+ .controls = wm8728_snd_controls,
+ .num_controls = ARRAY_SIZE(wm8728_snd_controls),
+ .dapm_widgets = wm8728_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
+ .dapm_routes = wm8728_intercon,
+ .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
+};
+
+static const struct of_device_id wm8728_of_match[] = {
+ { .compatible = "wlf,wm8728", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, wm8728_of_match);
+
+static const struct regmap_config wm8728_regmap = {
+ .reg_bits = 7,
+ .val_bits = 9,
+ .max_register = WM8728_IFCTL,
+
+ .reg_defaults = wm8728_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
+ .cache_type = REGCACHE_RBTREE,
+};
+
+#if defined(CONFIG_SPI_MASTER)
+static int wm8728_spi_probe(struct spi_device *spi)
+{
+ struct wm8728_priv *wm8728;
+ int ret;
+
+ wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
+ GFP_KERNEL);
+ if (wm8728 == NULL)
+ return -ENOMEM;
+
+ wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
+ if (IS_ERR(wm8728->regmap))
+ return PTR_ERR(wm8728->regmap);
+
+ spi_set_drvdata(spi, wm8728);
+
+ ret = snd_soc_register_codec(&spi->dev,
+ &soc_codec_dev_wm8728, &wm8728_dai, 1);
+
+ return ret;
+}
+
+static int wm8728_spi_remove(struct spi_device *spi)
+{
+ snd_soc_unregister_codec(&spi->dev);
+
+ return 0;
+}
+
+static struct spi_driver wm8728_spi_driver = {
+ .driver = {
+ .name = "wm8728",
+ .owner = THIS_MODULE,
+ .of_match_table = wm8728_of_match,
+ },
+ .probe = wm8728_spi_probe,
+ .remove = wm8728_spi_remove,
+};
+#endif /* CONFIG_SPI_MASTER */
+
+#if IS_ENABLED(CONFIG_I2C)
+static int wm8728_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct wm8728_priv *wm8728;
+ int ret;
+
+ wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
+ GFP_KERNEL);
+ if (wm8728 == NULL)
+ return -ENOMEM;
+
+ wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
+ if (IS_ERR(wm8728->regmap))
+ return PTR_ERR(wm8728->regmap);
+
+ i2c_set_clientdata(i2c, wm8728);
+
+ ret = snd_soc_register_codec(&i2c->dev,
+ &soc_codec_dev_wm8728, &wm8728_dai, 1);
+
+ return ret;
+}
+
+static int wm8728_i2c_remove(struct i2c_client *client)
+{
+ snd_soc_unregister_codec(&client->dev);
+ return 0;
+}
+
+static const struct i2c_device_id wm8728_i2c_id[] = {
+ { "wm8728", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
+
+static struct i2c_driver wm8728_i2c_driver = {
+ .driver = {
+ .name = "wm8728",
+ .owner = THIS_MODULE,
+ .of_match_table = wm8728_of_match,
+ },
+ .probe = wm8728_i2c_probe,
+ .remove = wm8728_i2c_remove,
+ .id_table = wm8728_i2c_id,
+};
+#endif
+
+static int __init wm8728_modinit(void)
+{
+ int ret = 0;
+#if IS_ENABLED(CONFIG_I2C)
+ ret = i2c_add_driver(&wm8728_i2c_driver);
+ if (ret != 0) {
+ printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
+ ret);
+ }
+#endif
+#if defined(CONFIG_SPI_MASTER)
+ ret = spi_register_driver(&wm8728_spi_driver);
+ if (ret != 0) {
+ printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
+ ret);
+ }
+#endif
+ return ret;
+}
+module_init(wm8728_modinit);
+
+static void __exit wm8728_exit(void)
+{
+#if IS_ENABLED(CONFIG_I2C)
+ i2c_del_driver(&wm8728_i2c_driver);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+ spi_unregister_driver(&wm8728_spi_driver);
+#endif
+}
+module_exit(wm8728_exit);
+
+MODULE_DESCRIPTION("ASoC WM8728 driver");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff