[alsa-devel] [PATCH v2] ALSA: ASoC: add codec driver for TI TAS5086
Daniel Mack
zonque at gmail.com
Fri Mar 8 13:52:09 CET 2013
This patch adds a driver for TI's TA5086 6-channel PWM processor.
This chip has a very unusual register layout, specifically because the
registers are of unequal size, and multi-byte registers require bulk
writes to take effect. Regmap does not support these kind of mappings.
Currently, the driver does not touch any of the registers >= 0x20, so
it doesn't matter, because the register map is mapped to an 8-bit array.
In case more features will be added in the future that require access
to higher registers, the entire regmap H/W I/O routines have to be
open-coded.
Signed-off-by: Daniel Mack <zonque at gmail.com>
---
v2:
* define clock indices in a header
* switched to switch-case in some places
* dropped empty suspend function
* moved device id checks and gpio allocations to i2c level
* switched to mute_stream()
.../devicetree/bindings/sound/ti,tas5086.txt | 32 ++
include/sound/tas5086.h | 7 +
sound/soc/codecs/Kconfig | 4 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/tas5086.c | 601 +++++++++++++++++++++
5 files changed, 646 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/ti,tas5086.txt
create mode 100644 include/sound/tas5086.h
create mode 100644 sound/soc/codecs/tas5086.c
diff --git a/Documentation/devicetree/bindings/sound/ti,tas5086.txt b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
new file mode 100644
index 0000000..8ea4f5b
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ti,tas5086.txt
@@ -0,0 +1,32 @@
+Texas Instruments TAS5086 6-channel PWM Processor
+
+Required properties:
+
+ - compatible: Should contain "ti,tas5086".
+ - reg: The i2c address. Should contain <0x1b>.
+
+Optional properties:
+
+ - reset-gpio: A GPIO spec to define which pin is connected to the
+ chip's !RESET pin. If specified, the driver will
+ assert a hardware reset at probe time.
+
+ - ti,charge-period: This property should contain the time in microseconds
+ that closely matches the external single-ended
+ split-capacitor charge period. The hardware chip
+ waits for this period of time before starting the
+ PWM signals. This helps reduce pops and clicks.
+
+ When not specified, the hardware default of 1300ms
+ is retained.
+
+Examples:
+
+ i2c_bus {
+ tas5086 at 1b {
+ compatible = "ti,tas5086";
+ reg = <0x1b>;
+ reset-gpio = <&gpio 23 0>;
+ ti,charge-period = <156000>;
+ };
+ };
diff --git a/include/sound/tas5086.h b/include/sound/tas5086.h
new file mode 100644
index 0000000..aac481b
--- /dev/null
+++ b/include/sound/tas5086.h
@@ -0,0 +1,7 @@
+#ifndef _SND_SOC_CODEC_TAS5086_H_
+#define _SND_SOC_CODEC_TAS5086_H_
+
+#define TAS5086_CLK_IDX_MCLK 0
+#define TAS5086_CLK_IDX_SCLK 1
+
+#endif /* _SND_SOC_CODEC_TAS5086_H_ */
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 500f666..18fea10 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -64,6 +64,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_STA32X if I2C
select SND_SOC_STA529 if I2C
select SND_SOC_STAC9766 if SND_SOC_AC97_BUS
+ select SND_SOC_TAS5086 if I2C
select SND_SOC_TLV320AIC23 if I2C
select SND_SOC_TLV320AIC26 if SPI_MASTER
select SND_SOC_TLV320AIC32X4 if I2C
@@ -324,6 +325,9 @@ config SND_SOC_STA529
config SND_SOC_STAC9766
tristate
+config SND_SOC_TAS5086
+ tristate
+
config SND_SOC_TLV320AIC23
tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 3a7ec1c..b9e41c9 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -56,6 +56,7 @@ snd-soc-ssm2602-objs := ssm2602.o
snd-soc-sta32x-objs := sta32x.o
snd-soc-sta529-objs := sta529.o
snd-soc-stac9766-objs := stac9766.o
+snd-soc-tas5086-objs := tas5086.o
snd-soc-tlv320aic23-objs := tlv320aic23.o
snd-soc-tlv320aic26-objs := tlv320aic26.o
snd-soc-tlv320aic3x-objs := tlv320aic3x.o
@@ -179,6 +180,7 @@ obj-$(CONFIG_SND_SOC_SSM2602) += snd-soc-ssm2602.o
obj-$(CONFIG_SND_SOC_STA32X) += snd-soc-sta32x.o
obj-$(CONFIG_SND_SOC_STA529) += snd-soc-sta529.o
obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o
+obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o
obj-$(CONFIG_SND_SOC_TLV320AIC23) += snd-soc-tlv320aic23.o
obj-$(CONFIG_SND_SOC_TLV320AIC26) += snd-soc-tlv320aic26.o
obj-$(CONFIG_SND_SOC_TLV320AIC3X) += snd-soc-tlv320aic3x.o
diff --git a/sound/soc/codecs/tas5086.c b/sound/soc/codecs/tas5086.c
new file mode 100644
index 0000000..008bea4
--- /dev/null
+++ b/sound/soc/codecs/tas5086.c
@@ -0,0 +1,601 @@
+/*
+ * TAS5086 ASoC codec driver
+ *
+ * Copyright (c) 2013 Daniel Mack <zonque at gmail.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.
+ *
+ * TODO:
+ * - implement DAPM and input muxing
+ * - implement modulation limit
+ * - implement non-default PWM start
+ *
+ * Note that this chip has a very unusual register layout, specifically
+ * because the registers are of unequal size, and multi-byte registers
+ * require bulk writes to take effect. Regmap does not support that kind
+ * of devices.
+ *
+ * Currently, the driver does not touch any of the registers >= 0x20, so
+ * it doesn't matter because the entire map can be accessed as 8-bit
+ * array. In case more features will be added in the future
+ * that require access to higher registers, the entire regmap H/W I/O
+ * routines have to be open-coded.
+ */
+
+#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/spi/spi.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>
+#include <sound/tas5086.h>
+
+#define TAS5086_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_3LE)
+
+#define TAS5086_PCM_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
+ SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
+ SNDRV_PCM_RATE_192000)
+
+/*
+ * TAS5086 registers
+ */
+#define TAS5086_CLOCK_CONTROL 0x00 /* Clock control register */
+#define TAS5086_CLOCK_RATE(val) (val << 5)
+#define TAS5086_CLOCK_RATE_MASK (0x7 << 5)
+#define TAS5086_CLOCK_RATIO(val) (val << 2)
+#define TAS5086_CLOCK_RATIO_MASK (0x7 << 2)
+#define TAS5086_CLOCK_SCLK_RATIO_48 (1 << 1)
+#define TAS5086_CLOCK_VALID (1 << 0)
+
+#define TAS5086_DEEMPH_MASK 0x03
+#define TAS5086_SOFT_MUTE_ALL 0x3f
+
+#define TAS5086_DEV_ID 0x01 /* Device ID register */
+#define TAS5086_ERROR_STATUS 0x02 /* Error status register */
+#define TAS5086_SYS_CONTROL_1 0x03 /* System control register 1 */
+#define TAS5086_SERIAL_DATA_IF 0x04 /* Serial data interface register */
+#define TAS5086_SYS_CONTROL_2 0x05 /* System control register 2 */
+#define TAS5086_SOFT_MUTE 0x06 /* Soft mute register */
+#define TAS5086_MASTER_VOL 0x07 /* Master volume */
+#define TAS5086_CHANNEL_VOL(X) (0x08 + (X)) /* Channel 1-6 volume */
+#define TAS5086_VOLUME_CONTROL 0x09 /* Volume control register */
+#define TAS5086_MOD_LIMIT 0x10 /* Modulation limit register */
+#define TAS5086_PWM_START 0x18 /* PWM start register */
+#define TAS5086_SURROUND 0x19 /* Surround register */
+#define TAS5086_SPLIT_CAP_CHARGE 0x1a /* Split cap charge period register */
+#define TAS5086_OSC_TRIM 0x1b /* Oscillator trim register */
+#define TAS5086_BKNDERR 0x1c
+
+/*
+ * Default TAS5086 power-up configuration
+ */
+static const struct reg_default tas5086_reg_defaults[] = {
+ { 0x00, 0x6c },
+ { 0x01, 0x03 },
+ { 0x02, 0x00 },
+ { 0x03, 0xa0 },
+ { 0x04, 0x05 },
+ { 0x05, 0x60 },
+ { 0x06, 0x00 },
+ { 0x07, 0xff },
+ { 0x08, 0x30 },
+ { 0x09, 0x30 },
+ { 0x0a, 0x30 },
+ { 0x0b, 0x30 },
+ { 0x0c, 0x30 },
+ { 0x0d, 0x30 },
+ { 0x0e, 0xb1 },
+ { 0x0f, 0x00 },
+ { 0x10, 0x02 },
+ { 0x11, 0x00 },
+ { 0x12, 0x00 },
+ { 0x13, 0x00 },
+ { 0x14, 0x00 },
+ { 0x15, 0x00 },
+ { 0x16, 0x00 },
+ { 0x17, 0x00 },
+ { 0x18, 0x3f },
+ { 0x19, 0x00 },
+ { 0x1a, 0x18 },
+ { 0x1b, 0x82 },
+ { 0x1c, 0x05 },
+};
+
+static bool tas5086_accessible_reg(struct device *dev, unsigned int reg)
+{
+ return !((reg == 0x0f) || (reg >= 0x11 && reg <= 0x17));
+}
+
+static bool tas5086_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TAS5086_DEV_ID:
+ case TAS5086_ERROR_STATUS:
+ return true;
+ }
+
+ return false;
+}
+
+static bool tas5086_writeable_reg(struct device *dev, unsigned int reg)
+{
+ return tas5086_accessible_reg(dev, reg) && (reg != TAS5086_DEV_ID);
+}
+
+struct tas5086_private {
+ struct regmap *regmap;
+ unsigned int mclk, sclk;
+ unsigned int format;
+ bool deemph;
+ /* Current sample rate for de-emphasis control */
+ int rate;
+ /* GPIO driving Reset pin, if any */
+ int gpio_nreset;
+};
+
+static int tas5086_deemph[] = { 0, 32000, 44100, 48000 };
+
+static int tas5086_set_deemph(struct snd_soc_codec *codec)
+{
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+ int i, val = 0;
+
+ if (priv->deemph)
+ for (i = 0; i < ARRAY_SIZE(tas5086_deemph); i++)
+ if (tas5086_deemph[i] == priv->rate)
+ val = i;
+
+ return regmap_update_bits(priv->regmap, TAS5086_SYS_CONTROL_1,
+ TAS5086_DEEMPH_MASK, val);
+}
+
+static int tas5086_get_deemph(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ ucontrol->value.enumerated.item[0] = priv->deemph;
+
+ return 0;
+}
+
+static int tas5086_put_deemph(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ priv->deemph = ucontrol->value.enumerated.item[0];
+
+ return tas5086_set_deemph(codec);
+}
+
+
+static int tas5086_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ switch (clk_id) {
+ case TAS5086_CLK_IDX_MCLK:
+ priv->mclk = freq;
+ break;
+ case TAS5086_CLK_IDX_SCLK:
+ priv->sclk = freq;
+ break;
+ }
+
+ return 0;
+}
+
+static int tas5086_set_dai_fmt(struct snd_soc_dai *codec_dai,
+ unsigned int format)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ /* The TAS5086 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;
+ }
+
+ /* we need to refer to the data format from hw_params() */
+ priv->format = format;
+
+ return 0;
+}
+
+static const int tas5086_sample_rates[] = {
+ 32000, 38000, 44100, 48000, 88200, 96000, 176400, 192000
+};
+
+static const int tas5086_ratios[] = {
+ 64, 128, 192, 256, 384, 512
+};
+
+static int index_in_array(const int *array, int len, int needle)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (array[i] == needle)
+ return i;
+
+ return -ENOENT;
+}
+
+static int tas5086_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 tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+ unsigned int val;
+ int ret;
+
+ priv->rate = params_rate(params);
+
+ /* Look up the sample rate and refer to the offset in the list */
+ val = index_in_array(tas5086_sample_rates,
+ ARRAY_SIZE(tas5086_sample_rates), priv->rate);
+
+ if (val < 0) {
+ dev_err(codec->dev, "Invalid sample rate\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+ TAS5086_CLOCK_RATE_MASK,
+ TAS5086_CLOCK_RATE(val));
+ if (ret < 0)
+ return ret;
+
+ /* MCLK / Fs ratio */
+ val = index_in_array(tas5086_ratios, ARRAY_SIZE(tas5086_ratios),
+ priv->mclk / priv->rate);
+ if (val < 0) {
+ dev_err(codec->dev, "Inavlid MCLK / Fs ratio\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+ TAS5086_CLOCK_RATIO_MASK,
+ TAS5086_CLOCK_RATIO(val));
+ if (ret < 0)
+ return ret;
+
+
+ ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+ TAS5086_CLOCK_SCLK_RATIO_48,
+ (priv->sclk == 48 * priv->rate) ?
+ TAS5086_CLOCK_SCLK_RATIO_48 : 0);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The chip has a very unituitive register mapping and muxes information
+ * about data format and sample depth into the same register, but not on
+ * a logical bit-boundary. Hence, we have to refer to the format passed
+ * in the set_dai_fmt() callback and set up everything from here.
+ *
+ * First, determine the 'base' value, using the format ...
+ */
+ switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_RIGHT_J:
+ val = 0x00;
+ break;
+ case SND_SOC_DAIFMT_I2S:
+ val = 0x03;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ val = 0x06;
+ break;
+ default:
+ dev_err(codec->dev, "Invalid DAI format\n");
+ return -EINVAL;
+ }
+
+ /* ... then add the offset for the sample bit depth. */
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ val += 0;
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ val += 1;
+ break;
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ val += 2;
+ break;
+ default:
+ dev_err(codec->dev, "Invalid bit width\n");
+ return -EINVAL;
+ };
+
+ ret = regmap_write(priv->regmap, TAS5086_SERIAL_DATA_IF, val);
+ if (ret < 0)
+ return ret;
+
+ /* clock is considered valid now */
+ ret = regmap_update_bits(priv->regmap, TAS5086_CLOCK_CONTROL,
+ TAS5086_CLOCK_VALID, TAS5086_CLOCK_VALID);
+ if (ret < 0)
+ return ret;
+
+ return tas5086_set_deemph(codec);
+}
+
+static int tas5086_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+ unsigned int val = 0;
+
+ if (mute)
+ val = TAS5086_SOFT_MUTE_ALL;
+
+ return regmap_write(priv->regmap, TAS5086_SOFT_MUTE, val);
+}
+
+/* TAS5086 controls */
+static const DECLARE_TLV_DB_SCALE(tas5086_dac_tlv, -10350, 50, 1);
+
+static const struct snd_kcontrol_new tas5086_controls[] = {
+ SOC_SINGLE_TLV("Master Playback Volume", TAS5086_MASTER_VOL,
+ 0, 0xff, 1, tas5086_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
+ TAS5086_CHANNEL_VOL(0), TAS5086_CHANNEL_VOL(1),
+ 0, 0xff, 1, tas5086_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
+ TAS5086_CHANNEL_VOL(2), TAS5086_CHANNEL_VOL(3),
+ 0, 0xff, 1, tas5086_dac_tlv),
+ SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
+ TAS5086_CHANNEL_VOL(4), TAS5086_CHANNEL_VOL(5),
+ 0, 0xff, 1, tas5086_dac_tlv),
+ SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
+ tas5086_get_deemph, tas5086_put_deemph),
+};
+
+static const struct snd_soc_dai_ops tas5086_dai_ops = {
+ .hw_params = tas5086_hw_params,
+ .set_sysclk = tas5086_set_dai_sysclk,
+ .set_fmt = tas5086_set_dai_fmt,
+ .mute_stream = tas5086_mute_stream,
+};
+
+static struct snd_soc_dai_driver tas5086_dai = {
+ .name = "tas5086-hifi",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 6,
+ .rates = TAS5086_PCM_RATES,
+ .formats = TAS5086_PCM_FORMATS,
+ },
+ .ops = &tas5086_dai_ops,
+};
+
+#ifdef CONFIG_PM
+static int tas5086_soc_resume(struct snd_soc_codec *codec)
+{
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ /* Restore codec state */
+ return regcache_sync(priv->regmap);
+}
+#else
+#define tas5086_soc_resume NULL
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OF
+static const struct of_device_id tas5086_dt_ids[] = {
+ { .compatible = "ti,tas5086", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tas5086_dt_ids);
+#endif
+
+/* charge period values in microseconds */
+static const int tas5086_charge_period[] = {
+ 13000, 16900, 23400, 31200, 41600, 54600, 72800, 96200,
+ 130000, 156000, 234000, 312000, 416000, 546000, 728000, 962000,
+ 1300000, 169000, 2340000, 3120000, 4160000, 5460000, 7280000, 9620000,
+};
+
+static int tas5086_probe(struct snd_soc_codec *codec)
+{
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+ int charge_period = 1300000; /* hardware default is 1300 ms */
+ int i, ret;
+
+ if (of_match_device(of_match_ptr(tas5086_dt_ids), codec->dev)) {
+ struct device_node *of_node = codec->dev->of_node;
+ of_property_read_u32(of_node, "ti,charge-period", &charge_period);
+ }
+
+ /* lookup and set split-capacitor charge period */
+ if (charge_period == 0) {
+ regmap_write(priv->regmap, TAS5086_SPLIT_CAP_CHARGE, 0);
+ } else {
+ i = index_in_array(tas5086_charge_period,
+ ARRAY_SIZE(tas5086_charge_period),
+ charge_period);
+ if (i >= 0)
+ regmap_write(priv->regmap, TAS5086_SPLIT_CAP_CHARGE,
+ i + 0x08);
+ else
+ dev_warn(codec->dev,
+ "Invalid split-cap charge period of %d ns.\n",
+ charge_period);
+ }
+
+ /* enable factory trim */
+ ret = regmap_write(priv->regmap, TAS5086_OSC_TRIM, 0x00);
+ if (ret < 0)
+ return ret;
+
+ /* start all channels */
+ ret = regmap_write(priv->regmap, TAS5086_SYS_CONTROL_2, 0x20);
+ if (ret < 0)
+ return ret;
+
+ /* set master volume to 0 dB */
+ ret = regmap_write(priv->regmap, TAS5086_MASTER_VOL, 0x30);
+ if (ret < 0)
+ return ret;
+
+ /* mute all channels for now */
+ ret = regmap_write(priv->regmap, TAS5086_SOFT_MUTE,
+ TAS5086_SOFT_MUTE_ALL);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int tas5086_remove(struct snd_soc_codec *codec)
+{
+ struct tas5086_private *priv = snd_soc_codec_get_drvdata(codec);
+
+ if (gpio_is_valid(priv->gpio_nreset))
+ /* Set codec to the reset state */
+ gpio_set_value(priv->gpio_nreset, 0);
+
+ return 0;
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_tas5086 = {
+ .probe = tas5086_probe,
+ .remove = tas5086_remove,
+ .resume = tas5086_soc_resume,
+ .controls = tas5086_controls,
+ .num_controls = ARRAY_SIZE(tas5086_controls),
+};
+
+static const struct i2c_device_id tas5086_i2c_id[] = {
+ { "tas5086", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tas5086_i2c_id);
+
+static const struct regmap_config tas5086_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = ARRAY_SIZE(tas5086_reg_defaults),
+ .reg_defaults = tas5086_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(tas5086_reg_defaults),
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_reg = tas5086_volatile_reg,
+ .writeable_reg = tas5086_writeable_reg,
+ .readable_reg = tas5086_accessible_reg,
+};
+
+static int tas5086_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct tas5086_private *priv;
+ struct device *dev = &i2c->dev;
+ int gpio_nreset = -EINVAL;
+ int i, ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = devm_regmap_init_i2c(i2c, &tas5086_regmap);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
+ return ret;
+ }
+
+ i2c_set_clientdata(i2c, priv);
+
+ if (of_match_device(of_match_ptr(tas5086_dt_ids), dev)) {
+ struct device_node *of_node = dev->of_node;
+ gpio_nreset = of_get_named_gpio(of_node, "reset-gpio", 0);
+ }
+
+ if (gpio_is_valid(gpio_nreset))
+ if (devm_gpio_request(dev, gpio_nreset, "TAS5086 Reset"))
+ gpio_nreset = -EINVAL;
+
+ if (gpio_is_valid(gpio_nreset)) {
+ /* Reset codec - minimum assertion time is 400ns */
+ gpio_direction_output(gpio_nreset, 0);
+ udelay(1);
+ gpio_set_value(gpio_nreset, 1);
+
+ /* Codec needs ~15ms to wake up */
+ msleep(15);
+ }
+
+ priv->gpio_nreset = gpio_nreset;
+
+ /* The TAS5086 always returns 0x03 in its TAS5086_DEV_ID register */
+ ret = regmap_read(priv->regmap, TAS5086_DEV_ID, &i);
+ if (ret < 0)
+ return ret;
+
+ if (i != 0x3) {
+ dev_err(dev,
+ "Failed to identify TAS5086 codec (got %02x)\n", i);
+ return -ENODEV;
+ }
+
+ return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_tas5086,
+ &tas5086_dai, 1);
+}
+
+static int tas5086_i2c_remove(struct i2c_client *i2c)
+{
+ snd_soc_unregister_codec(&i2c->dev);
+ return 0;
+}
+
+static struct i2c_driver tas5086_i2c_driver = {
+ .driver = {
+ .name = "tas5086",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(tas5086_dt_ids),
+ },
+ .id_table = tas5086_i2c_id,
+ .probe = tas5086_i2c_probe,
+ .remove = tas5086_i2c_remove,
+};
+
+static int __init tas5086_modinit(void)
+{
+ return i2c_add_driver(&tas5086_i2c_driver);
+}
+module_init(tas5086_modinit);
+
+static void __exit tas5086_modexit(void)
+{
+ i2c_del_driver(&tas5086_i2c_driver);
+}
+module_exit(tas5086_modexit);
+
+MODULE_AUTHOR("Daniel Mack <zonque at gmail.com>");
+MODULE_DESCRIPTION("Texas Instruments TAS5086 ALSA SoC Codec Driver");
+MODULE_LICENSE("GPL");
--
1.8.1.4
More information about the Alsa-devel
mailing list