ASoC: ssm4567: Add driver for Analog Devices SSM4567 amplifier

Analog Devices SSM4567 is a boost class-D audio amplifier.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 352 insertions, 0 deletions

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 8838838e25ed..bc1fe4e9f8ea 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -90,6 +90,7 @@ config SND_SOC_ALL_CODECS
         select SND_SOC_SSM2518 if I2C
         select SND_SOC_SSM2602_SPI if SPI_MASTER
         select SND_SOC_SSM2602_I2C if I2C
+        select SND_SOC_SSM4567 if I2C
         select SND_SOC_STA32X if I2C
         select SND_SOC_STA350 if I2C
         select SND_SOC_STA529 if I2C
@@ -527,6 +528,10 @@ config SND_SOC_SSM2602_I2C
         select SND_SOC_SSM2602
         tristate
 
+config SND_SOC_SSM4567
+        tristate "Analog Devices ssm4567 amplifier driver support"
+        depends on I2C
+
 config SND_SOC_STA32X
         tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 20afe0f0c5be..bebad36fa719 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -91,6 +91,7 @@ snd-soc-ssm2518-objs := ssm2518.o
 snd-soc-ssm2602-objs := ssm2602.o
 snd-soc-ssm2602-spi-objs := ssm2602-spi.o
 snd-soc-ssm2602-i2c-objs := ssm2602-i2c.o
+snd-soc-ssm4567-objs := ssm4567.o
 snd-soc-sta32x-objs := sta32x.o
 snd-soc-sta350-objs := sta350.o
 snd-soc-sta529-objs := sta529.o
@@ -258,6 +259,7 @@ obj-$(CONFIG_SND_SOC_SSM2518)	+= snd-soc-ssm2518.o
 obj-$(CONFIG_SND_SOC_SSM2602)   += snd-soc-ssm2602.o
 obj-$(CONFIG_SND_SOC_SSM2602_SPI)       += snd-soc-ssm2602-spi.o
 obj-$(CONFIG_SND_SOC_SSM2602_I2C)       += snd-soc-ssm2602-i2c.o
+obj-$(CONFIG_SND_SOC_SSM4567)   += snd-soc-ssm4567.o
 obj-$(CONFIG_SND_SOC_STA32X)   += snd-soc-sta32x.o
 obj-$(CONFIG_SND_SOC_STA350)   += snd-soc-sta350.o
 obj-$(CONFIG_SND_SOC_STA529)   += snd-soc-sta529.o
diff --git a/sound/soc/codecs/ssm4567.c b/sound/soc/codecs/ssm4567.c
new file mode 100644
index 000000000000..1dadacb94efc
--- /dev/null
+++ b/sound/soc/codecs/ssm4567.c
@@ -0,0 +1,345 @@
+/*
+ * SSM4567 amplifier audio driver
+ *
+ * Copyright 2014 Google Chromium project.
+ *  Author: Anatol Pomozov <anatol@chromium.org>
+ *
+ * Based on code copyright/by:
+ *   Copyright 2013 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/slab.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>
+
+#define SSM4567_REG_POWER_CTRL          0x00
+#define SSM4567_REG_AMP_SNS_CTRL                0x01
+#define SSM4567_REG_DAC_CTRL            0x02
+#define SSM4567_REG_DAC_VOLUME          0x03
+#define SSM4567_REG_SAI_CTRL_1          0x04
+#define SSM4567_REG_SAI_CTRL_2          0x05
+#define SSM4567_REG_SAI_PLACEMENT_1             0x06
+#define SSM4567_REG_SAI_PLACEMENT_2             0x07
+#define SSM4567_REG_SAI_PLACEMENT_3             0x08
+#define SSM4567_REG_SAI_PLACEMENT_4             0x09
+#define SSM4567_REG_SAI_PLACEMENT_5             0x0a
+#define SSM4567_REG_SAI_PLACEMENT_6             0x0b
+#define SSM4567_REG_BATTERY_V_OUT               0x0c
+#define SSM4567_REG_LIMITER_CTRL_1              0x0d
+#define SSM4567_REG_LIMITER_CTRL_2              0x0e
+#define SSM4567_REG_LIMITER_CTRL_3              0x0f
+#define SSM4567_REG_STATUS_1            0x10
+#define SSM4567_REG_STATUS_2            0x11
+#define SSM4567_REG_FAULT_CTRL          0x12
+#define SSM4567_REG_PDM_CTRL            0x13
+#define SSM4567_REG_MCLK_RATIO          0x14
+#define SSM4567_REG_BOOST_CTRL_1                0x15
+#define SSM4567_REG_BOOST_CTRL_2                0x16
+#define SSM4567_REG_SOFT_RESET          0xff
+
+/* POWER_CTRL */
+#define SSM4567_POWER_APWDN_EN          BIT(7)
+#define SSM4567_POWER_BSNS_PWDN         BIT(6)
+#define SSM4567_POWER_VSNS_PWDN         BIT(5)
+#define SSM4567_POWER_ISNS_PWDN         BIT(4)
+#define SSM4567_POWER_BOOST_PWDN                BIT(3)
+#define SSM4567_POWER_AMP_PWDN          BIT(2)
+#define SSM4567_POWER_VBAT_ONLY         BIT(1)
+#define SSM4567_POWER_SPWDN                     BIT(0)
+
+/* DAC_CTRL */
+#define SSM4567_DAC_HV                  BIT(7)
+#define SSM4567_DAC_MUTE                BIT(6)
+#define SSM4567_DAC_HPF                 BIT(5)
+#define SSM4567_DAC_LPM                 BIT(4)
+#define SSM4567_DAC_FS_MASK     0x7
+#define SSM4567_DAC_FS_8000_12000       0x0
+#define SSM4567_DAC_FS_16000_24000      0x1
+#define SSM4567_DAC_FS_32000_48000      0x2
+#define SSM4567_DAC_FS_64000_96000      0x3
+#define SSM4567_DAC_FS_128000_192000    0x4
+
+struct ssm4567 {
+        struct regmap *regmap;
+};
+
+static const struct reg_default ssm4567_reg_defaults[] = {
+        { SSM4567_REG_POWER_CTRL,       0x81 },
+        { SSM4567_REG_AMP_SNS_CTRL, 0x09 },
+        { SSM4567_REG_DAC_CTRL, 0x32 },
+        { SSM4567_REG_DAC_VOLUME, 0x40 },
+        { SSM4567_REG_SAI_CTRL_1, 0x00 },
+        { SSM4567_REG_SAI_CTRL_2, 0x08 },
+        { SSM4567_REG_SAI_PLACEMENT_1, 0x01 },
+        { SSM4567_REG_SAI_PLACEMENT_2, 0x20 },
+        { SSM4567_REG_SAI_PLACEMENT_3, 0x32 },
+        { SSM4567_REG_SAI_PLACEMENT_4, 0x07 },
+        { SSM4567_REG_SAI_PLACEMENT_5, 0x07 },
+        { SSM4567_REG_SAI_PLACEMENT_6, 0x07 },
+        { SSM4567_REG_BATTERY_V_OUT, 0x00 },
+        { SSM4567_REG_LIMITER_CTRL_1, 0xa4 },
+        { SSM4567_REG_LIMITER_CTRL_2, 0x73 },
+        { SSM4567_REG_LIMITER_CTRL_3, 0x00 },
+        { SSM4567_REG_STATUS_1, 0x00 },
+        { SSM4567_REG_STATUS_2, 0x00 },
+        { SSM4567_REG_FAULT_CTRL, 0x30 },
+        { SSM4567_REG_PDM_CTRL, 0x40 },
+        { SSM4567_REG_MCLK_RATIO, 0x11 },
+        { SSM4567_REG_BOOST_CTRL_1, 0x03 },
+        { SSM4567_REG_BOOST_CTRL_2, 0x00 },
+        { SSM4567_REG_SOFT_RESET, 0x00 },
+};
+
+
+static bool ssm4567_readable_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SSM4567_REG_POWER_CTRL ... SSM4567_REG_BOOST_CTRL_2:
+                return true;
+        default:
+                return false;
+        }
+
+}
+
+static bool ssm4567_writeable_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SSM4567_REG_POWER_CTRL ... SSM4567_REG_SAI_PLACEMENT_6:
+        case SSM4567_REG_LIMITER_CTRL_1 ... SSM4567_REG_LIMITER_CTRL_3:
+        case SSM4567_REG_FAULT_CTRL ... SSM4567_REG_BOOST_CTRL_2:
+        /* The datasheet states that soft reset register is read-only,
+         * but logically it is write-only. */
+        case SSM4567_REG_SOFT_RESET:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool ssm4567_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SSM4567_REG_BATTERY_V_OUT:
+        case SSM4567_REG_STATUS_1 ... SSM4567_REG_STATUS_2:
+        case SSM4567_REG_SOFT_RESET:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static const DECLARE_TLV_DB_MINMAX_MUTE(ssm4567_vol_tlv, -7125, 2400);
+
+static const struct snd_kcontrol_new ssm4567_snd_controls[] = {
+        SOC_SINGLE_TLV("Master Playback Volume", SSM4567_REG_DAC_VOLUME, 0,
+                0xff, 1, ssm4567_vol_tlv),
+        SOC_SINGLE("DAC Low Power Mode Switch", SSM4567_REG_DAC_CTRL, 4, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget ssm4567_dapm_widgets[] = {
+        SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM4567_REG_POWER_CTRL, 2, 1),
+
+        SND_SOC_DAPM_OUTPUT("OUT"),
+};
+
+static const struct snd_soc_dapm_route ssm4567_routes[] = {
+        { "OUT", NULL, "DAC" },
+};
+
+static int ssm4567_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 ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
+        unsigned int rate = params_rate(params);
+        unsigned int dacfs;
+
+        if (rate >= 8000 && rate <= 12000)
+                dacfs = SSM4567_DAC_FS_8000_12000;
+        else if (rate >= 16000 && rate <= 24000)
+                dacfs = SSM4567_DAC_FS_16000_24000;
+        else if (rate >= 32000 && rate <= 48000)
+                dacfs = SSM4567_DAC_FS_32000_48000;
+        else if (rate >= 64000 && rate <= 96000)
+                dacfs = SSM4567_DAC_FS_64000_96000;
+        else if (rate >= 64000 && rate <= 96000)
+                dacfs = SSM4567_DAC_FS_64000_96000;
+        else if (rate >= 128000 && rate <= 192000)
+                dacfs = SSM4567_DAC_FS_128000_192000;
+        else
+                return -EINVAL;
+
+        return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
+                                SSM4567_DAC_FS_MASK, dacfs);
+}
+
+static int ssm4567_mute(struct snd_soc_dai *dai, int mute)
+{
+        struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(dai->codec);
+        unsigned int val;
+
+        val = mute ? SSM4567_DAC_MUTE : 0;
+        return regmap_update_bits(ssm4567->regmap, SSM4567_REG_DAC_CTRL,
+                        SSM4567_DAC_MUTE, val);
+}
+
+static int ssm4567_set_power(struct ssm4567 *ssm4567, bool enable)
+{
+        int ret = 0;
+
+        if (!enable) {
+                ret = regmap_update_bits(ssm4567->regmap,
+                        SSM4567_REG_POWER_CTRL,
+                        SSM4567_POWER_SPWDN, SSM4567_POWER_SPWDN);
+                regcache_mark_dirty(ssm4567->regmap);
+        }
+
+        regcache_cache_only(ssm4567->regmap, !enable);
+
+        if (enable) {
+                ret = regmap_update_bits(ssm4567->regmap,
+                        SSM4567_REG_POWER_CTRL,
+                        SSM4567_POWER_SPWDN, 0x00);
+                regcache_sync(ssm4567->regmap);
+        }
+
+        return ret;
+}
+
+static int ssm4567_set_bias_level(struct snd_soc_codec *codec,
+        enum snd_soc_bias_level level)
+{
+        struct ssm4567 *ssm4567 = snd_soc_codec_get_drvdata(codec);
+        int ret = 0;
+
+        switch (level) {
+        case SND_SOC_BIAS_ON:
+                break;
+        case SND_SOC_BIAS_PREPARE:
+                break;
+        case SND_SOC_BIAS_STANDBY:
+                if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
+                        ret = ssm4567_set_power(ssm4567, true);
+                break;
+        case SND_SOC_BIAS_OFF:
+                ret = ssm4567_set_power(ssm4567, false);
+                break;
+        }
+
+        if (ret)
+                return ret;
+
+        codec->dapm.bias_level = level;
+
+        return 0;
+}
+
+static const struct snd_soc_dai_ops ssm4567_dai_ops = {
+        .hw_params      = ssm4567_hw_params,
+        .digital_mute   = ssm4567_mute,
+};
+
+static struct snd_soc_dai_driver ssm4567_dai = {
+        .name = "ssm4567-hifi",
+        .playback = {
+                .stream_name = "Playback",
+                .channels_min = 1,
+                .channels_max = 1,
+                .rates = SNDRV_PCM_RATE_8000_192000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |
+                        SNDRV_PCM_FMTBIT_S32,
+        },
+        .ops = &ssm4567_dai_ops,
+};
+
+static struct snd_soc_codec_driver ssm4567_codec_driver = {
+        .set_bias_level = ssm4567_set_bias_level,
+        .idle_bias_off = true,
+
+        .controls = ssm4567_snd_controls,
+        .num_controls = ARRAY_SIZE(ssm4567_snd_controls),
+        .dapm_widgets = ssm4567_dapm_widgets,
+        .num_dapm_widgets = ARRAY_SIZE(ssm4567_dapm_widgets),
+        .dapm_routes = ssm4567_routes,
+        .num_dapm_routes = ARRAY_SIZE(ssm4567_routes),
+};
+
+static const struct regmap_config ssm4567_regmap_config = {
+        .val_bits = 8,
+        .reg_bits = 8,
+
+        .max_register = SSM4567_REG_SOFT_RESET,
+        .readable_reg = ssm4567_readable_reg,
+        .writeable_reg = ssm4567_writeable_reg,
+        .volatile_reg = ssm4567_volatile_reg,
+
+        .cache_type = REGCACHE_RBTREE,
+        .reg_defaults = ssm4567_reg_defaults,
+        .num_reg_defaults = ARRAY_SIZE(ssm4567_reg_defaults),
+};
+
+static int ssm4567_i2c_probe(struct i2c_client *i2c,
+        const struct i2c_device_id *id)
+{
+        struct ssm4567 *ssm4567;
+        int ret;
+
+        ssm4567 = devm_kzalloc(&i2c->dev, sizeof(*ssm4567), GFP_KERNEL);
+        if (ssm4567 == NULL)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, ssm4567);
+
+        ssm4567->regmap = devm_regmap_init_i2c(i2c, &ssm4567_regmap_config);
+        if (IS_ERR(ssm4567->regmap))
+                return PTR_ERR(ssm4567->regmap);
+
+        ret = regmap_write(ssm4567->regmap, SSM4567_REG_SOFT_RESET, 0x00);
+        if (ret)
+                return ret;
+
+        ret = ssm4567_set_power(ssm4567, false);
+        if (ret)
+                return ret;
+
+        return snd_soc_register_codec(&i2c->dev, &ssm4567_codec_driver,
+                        &ssm4567_dai, 1);
+}
+
+static int ssm4567_i2c_remove(struct i2c_client *client)
+{
+        snd_soc_unregister_codec(&client->dev);
+        return 0;
+}
+
+static const struct i2c_device_id ssm4567_i2c_ids[] = {
+        { "ssm4567", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, ssm4567_i2c_ids);
+
+static struct i2c_driver ssm4567_driver = {
+        .driver = {
+                .name = "ssm4567",
+                .owner = THIS_MODULE,
+        },
+        .probe = ssm4567_i2c_probe,
+        .remove = ssm4567_i2c_remove,
+        .id_table = ssm4567_i2c_ids,
+};
+module_i2c_driver(ssm4567_driver);
+
+MODULE_DESCRIPTION("ASoC SSM4567 driver");
+MODULE_AUTHOR("Anatol Pomozov <anatol@chromium.org>");
+MODULE_LICENSE("GPL");