linux/sound/soc/codecs/tfa989x.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2021 Stephan Gerhold
   4 *
   5 * Register definitions/sequences taken from various tfa98xx kernel drivers:
   6 * Copyright (C) 2014-2020 NXP Semiconductors, All Rights Reserved.
   7 * Copyright (C) 2013 Sony Mobile Communications Inc.
   8 */
   9
  10#include <linux/i2c.h>
  11#include <linux/module.h>
  12#include <linux/regmap.h>
  13#include <linux/regulator/consumer.h>
  14#include <sound/soc.h>
  15
  16#define TFA989X_STATUSREG               0x00
  17#define TFA989X_BATTERYVOLTAGE          0x01
  18#define TFA989X_TEMPERATURE             0x02
  19#define TFA989X_REVISIONNUMBER          0x03
  20#define TFA989X_REVISIONNUMBER_REV_MSK  GENMASK(7, 0)   /* device revision */
  21#define TFA989X_I2SREG                  0x04
  22#define TFA989X_I2SREG_CHSA             6       /* amplifier input select */
  23#define TFA989X_I2SREG_CHSA_MSK         GENMASK(7, 6)
  24#define TFA989X_I2SREG_I2SSR            12      /* sample rate */
  25#define TFA989X_I2SREG_I2SSR_MSK        GENMASK(15, 12)
  26#define TFA989X_BAT_PROT                0x05
  27#define TFA989X_AUDIO_CTR               0x06
  28#define TFA989X_DCDCBOOST               0x07
  29#define TFA989X_SPKR_CALIBRATION        0x08
  30#define TFA989X_SYS_CTRL                0x09
  31#define TFA989X_SYS_CTRL_PWDN           0       /* power down */
  32#define TFA989X_SYS_CTRL_I2CR           1       /* I2C reset */
  33#define TFA989X_SYS_CTRL_CFE            2       /* enable CoolFlux DSP */
  34#define TFA989X_SYS_CTRL_AMPE           3       /* enable amplifier */
  35#define TFA989X_SYS_CTRL_DCA            4       /* enable boost */
  36#define TFA989X_SYS_CTRL_SBSL           5       /* DSP configured */
  37#define TFA989X_SYS_CTRL_AMPC           6       /* amplifier enabled by DSP */
  38#define TFA989X_I2S_SEL_REG             0x0a
  39#define TFA989X_I2S_SEL_REG_SPKR_MSK    GENMASK(10, 9)  /* speaker impedance */
  40#define TFA989X_I2S_SEL_REG_DCFG_MSK    GENMASK(14, 11) /* DCDC compensation */
  41#define TFA989X_PWM_CONTROL             0x41
  42#define TFA989X_CURRENTSENSE1           0x46
  43#define TFA989X_CURRENTSENSE2           0x47
  44#define TFA989X_CURRENTSENSE3           0x48
  45#define TFA989X_CURRENTSENSE4           0x49
  46
  47#define TFA9895_REVISION                0x12
  48#define TFA9897_REVISION                0x97
  49
  50struct tfa989x_rev {
  51        unsigned int rev;
  52        int (*init)(struct regmap *regmap);
  53};
  54
  55struct tfa989x {
  56        struct regulator *vddd_supply;
  57};
  58
  59static bool tfa989x_writeable_reg(struct device *dev, unsigned int reg)
  60{
  61        return reg > TFA989X_REVISIONNUMBER;
  62}
  63
  64static bool tfa989x_volatile_reg(struct device *dev, unsigned int reg)
  65{
  66        return reg < TFA989X_REVISIONNUMBER;
  67}
  68
  69static const struct regmap_config tfa989x_regmap = {
  70        .reg_bits = 8,
  71        .val_bits = 16,
  72
  73        .writeable_reg  = tfa989x_writeable_reg,
  74        .volatile_reg   = tfa989x_volatile_reg,
  75        .cache_type     = REGCACHE_RBTREE,
  76};
  77
  78static const char * const chsa_text[] = { "Left", "Right", /* "DSP" */ };
  79static SOC_ENUM_SINGLE_DECL(chsa_enum, TFA989X_I2SREG, TFA989X_I2SREG_CHSA, chsa_text);
  80static const struct snd_kcontrol_new chsa_mux = SOC_DAPM_ENUM("Amp Input", chsa_enum);
  81
  82static const struct snd_soc_dapm_widget tfa989x_dapm_widgets[] = {
  83        SND_SOC_DAPM_OUTPUT("OUT"),
  84        SND_SOC_DAPM_SUPPLY("POWER", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_PWDN, 1, NULL, 0),
  85        SND_SOC_DAPM_OUT_DRV("AMPE", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_AMPE, 0, NULL, 0),
  86
  87        SND_SOC_DAPM_MUX("Amp Input", SND_SOC_NOPM, 0, 0, &chsa_mux),
  88        SND_SOC_DAPM_AIF_IN("AIFINL", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
  89        SND_SOC_DAPM_AIF_IN("AIFINR", "HiFi Playback", 1, SND_SOC_NOPM, 0, 0),
  90};
  91
  92static const struct snd_soc_dapm_route tfa989x_dapm_routes[] = {
  93        {"OUT", NULL, "AMPE"},
  94        {"AMPE", NULL, "POWER"},
  95        {"AMPE", NULL, "Amp Input"},
  96        {"Amp Input", "Left", "AIFINL"},
  97        {"Amp Input", "Right", "AIFINR"},
  98};
  99
 100static const struct snd_soc_component_driver tfa989x_component = {
 101        .dapm_widgets           = tfa989x_dapm_widgets,
 102        .num_dapm_widgets       = ARRAY_SIZE(tfa989x_dapm_widgets),
 103        .dapm_routes            = tfa989x_dapm_routes,
 104        .num_dapm_routes        = ARRAY_SIZE(tfa989x_dapm_routes),
 105        .use_pmdown_time        = 1,
 106        .endianness             = 1,
 107        .non_legacy_dai_naming  = 1,
 108};
 109
 110static const unsigned int tfa989x_rates[] = {
 111        8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000
 112};
 113
 114static int tfa989x_find_sample_rate(unsigned int rate)
 115{
 116        int i;
 117
 118        for (i = 0; i < ARRAY_SIZE(tfa989x_rates); ++i)
 119                if (tfa989x_rates[i] == rate)
 120                        return i;
 121
 122        return -EINVAL;
 123}
 124
 125static int tfa989x_hw_params(struct snd_pcm_substream *substream,
 126                             struct snd_pcm_hw_params *params,
 127                             struct snd_soc_dai *dai)
 128{
 129        struct snd_soc_component *component = dai->component;
 130        int sr;
 131
 132        sr = tfa989x_find_sample_rate(params_rate(params));
 133        if (sr < 0)
 134                return sr;
 135
 136        return snd_soc_component_update_bits(component, TFA989X_I2SREG,
 137                                             TFA989X_I2SREG_I2SSR_MSK,
 138                                             sr << TFA989X_I2SREG_I2SSR);
 139}
 140
 141static const struct snd_soc_dai_ops tfa989x_dai_ops = {
 142        .hw_params = tfa989x_hw_params,
 143};
 144
 145static struct snd_soc_dai_driver tfa989x_dai = {
 146        .name = "tfa989x-hifi",
 147        .playback = {
 148                .stream_name    = "HiFi Playback",
 149                .formats        = SNDRV_PCM_FMTBIT_S16_LE,
 150                .rates          = SNDRV_PCM_RATE_8000_48000,
 151                .rate_min       = 8000,
 152                .rate_max       = 48000,
 153                .channels_min   = 1,
 154                .channels_max   = 2,
 155        },
 156        .ops = &tfa989x_dai_ops,
 157};
 158
 159static const struct reg_sequence tfa9895_reg_init[] = {
 160        /* some other registers must be set for optimal amplifier behaviour */
 161        { TFA989X_BAT_PROT, 0x13ab },
 162        { TFA989X_AUDIO_CTR, 0x001f },
 163
 164        /* peak voltage protection is always on, but may be written */
 165        { TFA989X_SPKR_CALIBRATION, 0x3c4e },
 166
 167        /* TFA989X_SYSCTRL_DCA = 0 */
 168        { TFA989X_SYS_CTRL, 0x024d },
 169        { TFA989X_PWM_CONTROL, 0x0308 },
 170        { TFA989X_CURRENTSENSE4, 0x0e82 },
 171};
 172
 173static int tfa9895_init(struct regmap *regmap)
 174{
 175        return regmap_multi_reg_write(regmap, tfa9895_reg_init,
 176                                      ARRAY_SIZE(tfa9895_reg_init));
 177}
 178
 179static const struct tfa989x_rev tfa9895_rev = {
 180        .rev    = TFA9895_REVISION,
 181        .init   = tfa9895_init,
 182};
 183
 184static int tfa9897_init(struct regmap *regmap)
 185{
 186        int ret;
 187
 188        /* Reduce slewrate by clearing iddqtestbst to avoid booster damage */
 189        ret = regmap_write(regmap, TFA989X_CURRENTSENSE3, 0x0300);
 190        if (ret)
 191                return ret;
 192
 193        /* Enable clipping */
 194        ret = regmap_clear_bits(regmap, TFA989X_CURRENTSENSE4, 0x1);
 195        if (ret)
 196                return ret;
 197
 198        /* Set required TDM configuration */
 199        return regmap_write(regmap, 0x14, 0x0);
 200}
 201
 202static const struct tfa989x_rev tfa9897_rev = {
 203        .rev    = TFA9897_REVISION,
 204        .init   = tfa9897_init,
 205};
 206
 207/*
 208 * Note: At the moment this driver bypasses the "CoolFlux DSP" built into the
 209 * TFA989X amplifiers. Unfortunately, there seems to be absolutely
 210 * no documentation for it - the public "short datasheets" do not provide
 211 * any information about the DSP or available registers.
 212 *
 213 * Usually the TFA989X amplifiers are configured through proprietary userspace
 214 * libraries. There are also some (rather complex) kernel drivers but even those
 215 * rely on obscure firmware blobs for configuration (so-called "containers").
 216 * They seem to contain different "profiles" with tuned speaker settings, sample
 217 * rates and volume steps (which would be better exposed as separate ALSA mixers).
 218 *
 219 * Bypassing the DSP disables volume control (and perhaps some speaker
 220 * optimization?), but at least allows using the speaker without obscure
 221 * kernel drivers and firmware.
 222 *
 223 * Ideally NXP (or now Goodix) should release proper documentation for these
 224 * amplifiers so that support for the "CoolFlux DSP" can be implemented properly.
 225 */
 226static int tfa989x_dsp_bypass(struct regmap *regmap)
 227{
 228        int ret;
 229
 230        /* Clear CHSA to bypass DSP and take input from I2S 1 left channel */
 231        ret = regmap_clear_bits(regmap, TFA989X_I2SREG, TFA989X_I2SREG_CHSA_MSK);
 232        if (ret)
 233                return ret;
 234
 235        /* Set DCDC compensation to off and speaker impedance to 8 ohm */
 236        ret = regmap_update_bits(regmap, TFA989X_I2S_SEL_REG,
 237                                 TFA989X_I2S_SEL_REG_DCFG_MSK |
 238                                 TFA989X_I2S_SEL_REG_SPKR_MSK,
 239                                 TFA989X_I2S_SEL_REG_SPKR_MSK);
 240        if (ret)
 241                return ret;
 242
 243        /* Set DCDC to follower mode and disable CoolFlux DSP */
 244        return regmap_clear_bits(regmap, TFA989X_SYS_CTRL,
 245                                 BIT(TFA989X_SYS_CTRL_DCA) |
 246                                 BIT(TFA989X_SYS_CTRL_CFE) |
 247                                 BIT(TFA989X_SYS_CTRL_AMPC));
 248}
 249
 250static void tfa989x_regulator_disable(void *data)
 251{
 252        struct tfa989x *tfa989x = data;
 253
 254        regulator_disable(tfa989x->vddd_supply);
 255}
 256
 257static int tfa989x_i2c_probe(struct i2c_client *i2c)
 258{
 259        struct device *dev = &i2c->dev;
 260        const struct tfa989x_rev *rev;
 261        struct tfa989x *tfa989x;
 262        struct regmap *regmap;
 263        unsigned int val;
 264        int ret;
 265
 266        rev = device_get_match_data(dev);
 267        if (!rev) {
 268                dev_err(dev, "unknown device revision\n");
 269                return -ENODEV;
 270        }
 271
 272        tfa989x = devm_kzalloc(dev, sizeof(*tfa989x), GFP_KERNEL);
 273        if (!tfa989x)
 274                return -ENOMEM;
 275
 276        i2c_set_clientdata(i2c, tfa989x);
 277
 278        tfa989x->vddd_supply = devm_regulator_get(dev, "vddd");
 279        if (IS_ERR(tfa989x->vddd_supply))
 280                return dev_err_probe(dev, PTR_ERR(tfa989x->vddd_supply),
 281                                     "Failed to get vddd regulator\n");
 282
 283        regmap = devm_regmap_init_i2c(i2c, &tfa989x_regmap);
 284        if (IS_ERR(regmap))
 285                return PTR_ERR(regmap);
 286
 287        ret = regulator_enable(tfa989x->vddd_supply);
 288        if (ret) {
 289                dev_err(dev, "Failed to enable vddd regulator: %d\n", ret);
 290                return ret;
 291        }
 292
 293        ret = devm_add_action_or_reset(dev, tfa989x_regulator_disable, tfa989x);
 294        if (ret)
 295                return ret;
 296
 297        /* Bypass regcache for reset and init sequence */
 298        regcache_cache_bypass(regmap, true);
 299
 300        /* Dummy read to generate i2c clocks, required on some devices */
 301        regmap_read(regmap, TFA989X_REVISIONNUMBER, &val);
 302
 303        ret = regmap_read(regmap, TFA989X_REVISIONNUMBER, &val);
 304        if (ret) {
 305                dev_err(dev, "failed to read revision number: %d\n", ret);
 306                return ret;
 307        }
 308
 309        val &= TFA989X_REVISIONNUMBER_REV_MSK;
 310        if (val != rev->rev) {
 311                dev_err(dev, "invalid revision number, expected %#x, got %#x\n",
 312                        rev->rev, val);
 313                return -ENODEV;
 314        }
 315
 316        ret = regmap_write(regmap, TFA989X_SYS_CTRL, BIT(TFA989X_SYS_CTRL_I2CR));
 317        if (ret) {
 318                dev_err(dev, "failed to reset I2C registers: %d\n", ret);
 319                return ret;
 320        }
 321
 322        ret = rev->init(regmap);
 323        if (ret) {
 324                dev_err(dev, "failed to initialize registers: %d\n", ret);
 325                return ret;
 326        }
 327
 328        ret = tfa989x_dsp_bypass(regmap);
 329        if (ret) {
 330                dev_err(dev, "failed to enable DSP bypass: %d\n", ret);
 331                return ret;
 332        }
 333        regcache_cache_bypass(regmap, false);
 334
 335        return devm_snd_soc_register_component(dev, &tfa989x_component,
 336                                               &tfa989x_dai, 1);
 337}
 338
 339static const struct of_device_id tfa989x_of_match[] = {
 340        { .compatible = "nxp,tfa9895", .data = &tfa9895_rev },
 341        { .compatible = "nxp,tfa9897", .data = &tfa9897_rev },
 342        { }
 343};
 344MODULE_DEVICE_TABLE(of, tfa989x_of_match);
 345
 346static struct i2c_driver tfa989x_i2c_driver = {
 347        .driver = {
 348                .name = "tfa989x",
 349                .of_match_table = tfa989x_of_match,
 350        },
 351        .probe_new = tfa989x_i2c_probe,
 352};
 353module_i2c_driver(tfa989x_i2c_driver);
 354
 355MODULE_DESCRIPTION("ASoC NXP/Goodix TFA989X (TFA1) driver");
 356MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>");
 357MODULE_LICENSE("GPL");
 358
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