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Diffstat (limited to 'sound/soc/codecs/tfa989x.c')
| -rw-r--r-- | sound/soc/codecs/tfa989x.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/sound/soc/codecs/tfa989x.c b/sound/soc/codecs/tfa989x.c new file mode 100644 index 000000000000..643b45188b6f --- /dev/null +++ b/sound/soc/codecs/tfa989x.c @@ -0,0 +1,357 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021 Stephan Gerhold + * + * Register definitions/sequences taken from various tfa98xx kernel drivers: + * Copyright (C) 2014-2020 NXP Semiconductors, All Rights Reserved. + * Copyright (C) 2013 Sony Mobile Communications Inc. + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <sound/soc.h> + +#define TFA989X_STATUSREG 0x00 +#define TFA989X_BATTERYVOLTAGE 0x01 +#define TFA989X_TEMPERATURE 0x02 +#define TFA989X_REVISIONNUMBER 0x03 +#define TFA989X_REVISIONNUMBER_REV_MSK GENMASK(7, 0) /* device revision */ +#define TFA989X_I2SREG 0x04 +#define TFA989X_I2SREG_CHSA 6 /* amplifier input select */ +#define TFA989X_I2SREG_CHSA_MSK GENMASK(7, 6) +#define TFA989X_I2SREG_I2SSR 12 /* sample rate */ +#define TFA989X_I2SREG_I2SSR_MSK GENMASK(15, 12) +#define TFA989X_BAT_PROT 0x05 +#define TFA989X_AUDIO_CTR 0x06 +#define TFA989X_DCDCBOOST 0x07 +#define TFA989X_SPKR_CALIBRATION 0x08 +#define TFA989X_SYS_CTRL 0x09 +#define TFA989X_SYS_CTRL_PWDN 0 /* power down */ +#define TFA989X_SYS_CTRL_I2CR 1 /* I2C reset */ +#define TFA989X_SYS_CTRL_CFE 2 /* enable CoolFlux DSP */ +#define TFA989X_SYS_CTRL_AMPE 3 /* enable amplifier */ +#define TFA989X_SYS_CTRL_DCA 4 /* enable boost */ +#define TFA989X_SYS_CTRL_SBSL 5 /* DSP configured */ +#define TFA989X_SYS_CTRL_AMPC 6 /* amplifier enabled by DSP */ +#define TFA989X_I2S_SEL_REG 0x0a +#define TFA989X_I2S_SEL_REG_SPKR_MSK GENMASK(10, 9) /* speaker impedance */ +#define TFA989X_I2S_SEL_REG_DCFG_MSK GENMASK(14, 11) /* DCDC compensation */ +#define TFA989X_PWM_CONTROL 0x41 +#define TFA989X_CURRENTSENSE1 0x46 +#define TFA989X_CURRENTSENSE2 0x47 +#define TFA989X_CURRENTSENSE3 0x48 +#define TFA989X_CURRENTSENSE4 0x49 + +#define TFA9895_REVISION 0x12 +#define TFA9897_REVISION 0x97 + +struct tfa989x_rev { + unsigned int rev; + int (*init)(struct regmap *regmap); +}; + +struct tfa989x { + struct regulator *vddd_supply; +}; + +static bool tfa989x_writeable_reg(struct device *dev, unsigned int reg) +{ + return reg > TFA989X_REVISIONNUMBER; +} + +static bool tfa989x_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg < TFA989X_REVISIONNUMBER; +} + +static const struct regmap_config tfa989x_regmap = { + .reg_bits = 8, + .val_bits = 16, + + .writeable_reg = tfa989x_writeable_reg, + .volatile_reg = tfa989x_volatile_reg, + .cache_type = REGCACHE_RBTREE, +}; + +static const char * const chsa_text[] = { "Left", "Right", /* "DSP" */ }; +static SOC_ENUM_SINGLE_DECL(chsa_enum, TFA989X_I2SREG, TFA989X_I2SREG_CHSA, chsa_text); +static const struct snd_kcontrol_new chsa_mux = SOC_DAPM_ENUM("Amp Input", chsa_enum); + +static const struct snd_soc_dapm_widget tfa989x_dapm_widgets[] = { + SND_SOC_DAPM_OUTPUT("OUT"), + SND_SOC_DAPM_SUPPLY("POWER", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_PWDN, 1, NULL, 0), + SND_SOC_DAPM_OUT_DRV("AMPE", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_AMPE, 0, NULL, 0), + + SND_SOC_DAPM_MUX("Amp Input", SND_SOC_NOPM, 0, 0, &chsa_mux), + SND_SOC_DAPM_AIF_IN("AIFINL", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0), + SND_SOC_DAPM_AIF_IN("AIFINR", "HiFi Playback", 1, SND_SOC_NOPM, 0, 0), +}; + +static const struct snd_soc_dapm_route tfa989x_dapm_routes[] = { + {"OUT", NULL, "AMPE"}, + {"AMPE", NULL, "POWER"}, + {"AMPE", NULL, "Amp Input"}, + {"Amp Input", "Left", "AIFINL"}, + {"Amp Input", "Right", "AIFINR"}, +}; + +static const struct snd_soc_component_driver tfa989x_component = { + .dapm_widgets = tfa989x_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(tfa989x_dapm_widgets), + .dapm_routes = tfa989x_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(tfa989x_dapm_routes), + .use_pmdown_time = 1, + .endianness = 1, + .non_legacy_dai_naming = 1, +}; + +static const unsigned int tfa989x_rates[] = { + 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 +}; + +static int tfa989x_find_sample_rate(unsigned int rate) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(tfa989x_rates); ++i) + if (tfa989x_rates[i] == rate) + return i; + + return -EINVAL; +} + +static int tfa989x_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct snd_soc_component *component = dai->component; + int sr; + + sr = tfa989x_find_sample_rate(params_rate(params)); + if (sr < 0) + return sr; + + return snd_soc_component_update_bits(component, TFA989X_I2SREG, + TFA989X_I2SREG_I2SSR_MSK, + sr << TFA989X_I2SREG_I2SSR); +} + +static const struct snd_soc_dai_ops tfa989x_dai_ops = { + .hw_params = tfa989x_hw_params, +}; + +static struct snd_soc_dai_driver tfa989x_dai = { + .name = "tfa989x-hifi", + .playback = { + .stream_name = "HiFi Playback", + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rates = SNDRV_PCM_RATE_8000_48000, + .rate_min = 8000, + .rate_max = 48000, + .channels_min = 1, + .channels_max = 2, + }, + .ops = &tfa989x_dai_ops, +}; + +static const struct reg_sequence tfa9895_reg_init[] = { + /* some other registers must be set for optimal amplifier behaviour */ + { TFA989X_BAT_PROT, 0x13ab }, + { TFA989X_AUDIO_CTR, 0x001f }, + + /* peak voltage protection is always on, but may be written */ + { TFA989X_SPKR_CALIBRATION, 0x3c4e }, + + /* TFA989X_SYSCTRL_DCA = 0 */ + { TFA989X_SYS_CTRL, 0x024d }, + { TFA989X_PWM_CONTROL, 0x0308 }, + { TFA989X_CURRENTSENSE4, 0x0e82 }, +}; + +static int tfa9895_init(struct regmap *regmap) +{ + return regmap_multi_reg_write(regmap, tfa9895_reg_init, + ARRAY_SIZE(tfa9895_reg_init)); +} + +static const struct tfa989x_rev tfa9895_rev = { + .rev = TFA9895_REVISION, + .init = tfa9895_init, +}; + +static int tfa9897_init(struct regmap *regmap) +{ + int ret; + + /* Reduce slewrate by clearing iddqtestbst to avoid booster damage */ + ret = regmap_write(regmap, TFA989X_CURRENTSENSE3, 0x0300); + if (ret) + return ret; + + /* Enable clipping */ + ret = regmap_clear_bits(regmap, TFA989X_CURRENTSENSE4, 0x1); + if (ret) + return ret; + + /* Set required TDM configuration */ + return regmap_write(regmap, 0x14, 0x0); +} + +static const struct tfa989x_rev tfa9897_rev = { + .rev = TFA9897_REVISION, + .init = tfa9897_init, +}; + +/* + * Note: At the moment this driver bypasses the "CoolFlux DSP" built into the + * TFA989X amplifiers. Unfortunately, there seems to be absolutely + * no documentation for it - the public "short datasheets" do not provide + * any information about the DSP or available registers. + * + * Usually the TFA989X amplifiers are configured through proprietary userspace + * libraries. There are also some (rather complex) kernel drivers but even those + * rely on obscure firmware blobs for configuration (so-called "containers"). + * They seem to contain different "profiles" with tuned speaker settings, sample + * rates and volume steps (which would be better exposed as separate ALSA mixers). + * + * Bypassing the DSP disables volume control (and perhaps some speaker + * optimization?), but at least allows using the speaker without obscure + * kernel drivers and firmware. + * + * Ideally NXP (or now Goodix) should release proper documentation for these + * amplifiers so that support for the "CoolFlux DSP" can be implemented properly. + */ +static int tfa989x_dsp_bypass(struct regmap *regmap) +{ + int ret; + + /* Clear CHSA to bypass DSP and take input from I2S 1 left channel */ + ret = regmap_clear_bits(regmap, TFA989X_I2SREG, TFA989X_I2SREG_CHSA_MSK); + if (ret) + return ret; + + /* Set DCDC compensation to off and speaker impedance to 8 ohm */ + ret = regmap_update_bits(regmap, TFA989X_I2S_SEL_REG, + TFA989X_I2S_SEL_REG_DCFG_MSK | + TFA989X_I2S_SEL_REG_SPKR_MSK, + TFA989X_I2S_SEL_REG_SPKR_MSK); + if (ret) + return ret; + + /* Set DCDC to follower mode and disable CoolFlux DSP */ + return regmap_clear_bits(regmap, TFA989X_SYS_CTRL, + BIT(TFA989X_SYS_CTRL_DCA) | + BIT(TFA989X_SYS_CTRL_CFE) | + BIT(TFA989X_SYS_CTRL_AMPC)); +} + +static void tfa989x_regulator_disable(void *data) +{ + struct tfa989x *tfa989x = data; + + regulator_disable(tfa989x->vddd_supply); +} + +static int tfa989x_i2c_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + const struct tfa989x_rev *rev; + struct tfa989x *tfa989x; + struct regmap *regmap; + unsigned int val; + int ret; + + rev = device_get_match_data(dev); + if (!rev) { + dev_err(dev, "unknown device revision\n"); + return -ENODEV; + } + + tfa989x = devm_kzalloc(dev, sizeof(*tfa989x), GFP_KERNEL); + if (!tfa989x) + return -ENOMEM; + + i2c_set_clientdata(i2c, tfa989x); + + tfa989x->vddd_supply = devm_regulator_get(dev, "vddd"); + if (IS_ERR(tfa989x->vddd_supply)) + return dev_err_probe(dev, PTR_ERR(tfa989x->vddd_supply), + "Failed to get vddd regulator\n"); + + regmap = devm_regmap_init_i2c(i2c, &tfa989x_regmap); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + ret = regulator_enable(tfa989x->vddd_supply); + if (ret) { + dev_err(dev, "Failed to enable vddd regulator: %d\n", ret); + return ret; + } + + ret = devm_add_action_or_reset(dev, tfa989x_regulator_disable, tfa989x); + if (ret) + return ret; + + /* Bypass regcache for reset and init sequence */ + regcache_cache_bypass(regmap, true); + + /* Dummy read to generate i2c clocks, required on some devices */ + regmap_read(regmap, TFA989X_REVISIONNUMBER, &val); + + ret = regmap_read(regmap, TFA989X_REVISIONNUMBER, &val); + if (ret) { + dev_err(dev, "failed to read revision number: %d\n", ret); + return ret; + } + + val &= TFA989X_REVISIONNUMBER_REV_MSK; + if (val != rev->rev) { + dev_err(dev, "invalid revision number, expected %#x, got %#x\n", + rev->rev, val); + return -ENODEV; + } + + ret = regmap_write(regmap, TFA989X_SYS_CTRL, BIT(TFA989X_SYS_CTRL_I2CR)); + if (ret) { + dev_err(dev, "failed to reset I2C registers: %d\n", ret); + return ret; + } + + ret = rev->init(regmap); + if (ret) { + dev_err(dev, "failed to initialize registers: %d\n", ret); + return ret; + } + + ret = tfa989x_dsp_bypass(regmap); + if (ret) { + dev_err(dev, "failed to enable DSP bypass: %d\n", ret); + return ret; + } + regcache_cache_bypass(regmap, false); + + return devm_snd_soc_register_component(dev, &tfa989x_component, + &tfa989x_dai, 1); +} + +static const struct of_device_id tfa989x_of_match[] = { + { .compatible = "nxp,tfa9895", .data = &tfa9895_rev }, + { .compatible = "nxp,tfa9897", .data = &tfa9897_rev }, + { } +}; +MODULE_DEVICE_TABLE(of, tfa989x_of_match); + +static struct i2c_driver tfa989x_i2c_driver = { + .driver = { + .name = "tfa989x", + .of_match_table = tfa989x_of_match, + }, + .probe_new = tfa989x_i2c_probe, +}; +module_i2c_driver(tfa989x_i2c_driver); + +MODULE_DESCRIPTION("ASoC NXP/Goodix TFA989X (TFA1) driver"); +MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>"); +MODULE_LICENSE("GPL"); |