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linux/sound/soc/codecs/ssm4567.c
Lars-Peter Clausen 5ad72152b6 ASoC: ssm4567: Add support for disabling the boost stage 
This patch adds a switch to enable/disable boost stage of the output
amplifier. Applications that know that they do not need the output
amplifier boost stage can disable it to conserve a bit of power.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
2014-11-06 16:05:10 +00:00

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/*
* 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
/* SAI_CTRL_1 */
#define SSM4567_SAI_CTRL_1_BCLK BIT(6)
#define SSM4567_SAI_CTRL_1_TDM_BLCKS_MASK (0x3 << 4)
#define SSM4567_SAI_CTRL_1_TDM_BLCKS_32 (0x0 << 4)
#define SSM4567_SAI_CTRL_1_TDM_BLCKS_48 (0x1 << 4)
#define SSM4567_SAI_CTRL_1_TDM_BLCKS_64 (0x2 << 4)
#define SSM4567_SAI_CTRL_1_FSYNC BIT(3)
#define SSM4567_SAI_CTRL_1_LJ BIT(2)
#define SSM4567_SAI_CTRL_1_TDM BIT(1)
#define SSM4567_SAI_CTRL_1_PDM BIT(0)
/* SAI_CTRL_2 */
#define SSM4567_SAI_CTRL_2_AUTO_SLOT BIT(3)
#define SSM4567_SAI_CTRL_2_TDM_SLOT_MASK 0x7
#define SSM4567_SAI_CTRL_2_TDM_SLOT(x) (x)
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),
SOC_SINGLE("DAC High Pass Filter Switch", SSM4567_REG_DAC_CTRL,
5, 1, 0),
};
static const struct snd_kcontrol_new ssm4567_amplifier_boost_control =
SOC_DAPM_SINGLE("Switch", SSM4567_REG_POWER_CTRL, 1, 1, 1);
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_SWITCH("Amplifier Boost", SSM4567_REG_POWER_CTRL, 3, 1,
&ssm4567_amplifier_boost_control),
SND_SOC_DAPM_OUTPUT("OUT"),
};
static const struct snd_soc_dapm_route ssm4567_routes[] = {
{ "OUT", NULL, "Amplifier Boost" },
{ "Amplifier Boost", "Switch", "DAC" },
{ "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 >= 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_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
unsigned int rx_mask, int slots, int width)
{
struct ssm4567 *ssm4567 = snd_soc_dai_get_drvdata(dai);
unsigned int blcks;
int slot;
int ret;
if (tx_mask == 0)
return -EINVAL;
if (rx_mask && rx_mask != tx_mask)
return -EINVAL;
slot = __ffs(tx_mask);
if (tx_mask != BIT(slot))
return -EINVAL;
switch (width) {
case 32:
blcks = SSM4567_SAI_CTRL_1_TDM_BLCKS_32;
break;
case 48:
blcks = SSM4567_SAI_CTRL_1_TDM_BLCKS_48;
break;
case 64:
blcks = SSM4567_SAI_CTRL_1_TDM_BLCKS_64;
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(ssm4567->regmap, SSM4567_REG_SAI_CTRL_2,
SSM4567_SAI_CTRL_2_AUTO_SLOT | SSM4567_SAI_CTRL_2_TDM_SLOT_MASK,
SSM4567_SAI_CTRL_2_TDM_SLOT(slot));
if (ret)
return ret;
return regmap_update_bits(ssm4567->regmap, SSM4567_REG_SAI_CTRL_1,
SSM4567_SAI_CTRL_1_TDM_BLCKS_MASK, blcks);
}
static int ssm4567_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct ssm4567 *ssm4567 = snd_soc_dai_get_drvdata(dai);
unsigned int ctrl1 = 0;
bool invert_fclk;
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:
invert_fclk = false;
break;
case SND_SOC_DAIFMT_IB_NF:
ctrl1 |= SSM4567_SAI_CTRL_1_BCLK;
invert_fclk = false;
break;
case SND_SOC_DAIFMT_NB_IF:
ctrl1 |= SSM4567_SAI_CTRL_1_FSYNC;
invert_fclk = true;
break;
case SND_SOC_DAIFMT_IB_IF:
ctrl1 |= SSM4567_SAI_CTRL_1_BCLK;
invert_fclk = true;
break;
default:
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
break;
case SND_SOC_DAIFMT_LEFT_J:
ctrl1 |= SSM4567_SAI_CTRL_1_LJ;
invert_fclk = !invert_fclk;
break;
case SND_SOC_DAIFMT_DSP_A:
ctrl1 |= SSM4567_SAI_CTRL_1_TDM;
break;
case SND_SOC_DAIFMT_DSP_B:
ctrl1 |= SSM4567_SAI_CTRL_1_TDM | SSM4567_SAI_CTRL_1_LJ;
break;
case SND_SOC_DAIFMT_PDM:
ctrl1 |= SSM4567_SAI_CTRL_1_PDM;
break;
default:
return -EINVAL;
}
if (invert_fclk)
ctrl1 |= SSM4567_SAI_CTRL_1_FSYNC;
return regmap_write(ssm4567->regmap, SSM4567_REG_SAI_CTRL_1, ctrl1);
}
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,
.set_fmt = ssm4567_set_dai_fmt,
.set_tdm_slot = ssm4567_set_tdm_slot,
};
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");
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