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/gpio/consumer.h> 11 #include <linux/i2c.h> 12 #include <linux/module.h> 13 #include <linux/regmap.h> 14 #include <linux/regulator/consumer.h> 15 #include <sound/soc.h> 16 17 #define TFA989X_STATUSREG 0x00 18 #define TFA989X_BATTERYVOLTAGE 0x01 19 #define TFA989X_TEMPERATURE 0x02 20 #define TFA989X_REVISIONNUMBER 0x03 21 #define TFA989X_REVISIONNUMBER_REV_MSK GENMASK(7, 0) /* device revision */ 22 #define TFA989X_I2SREG 0x04 23 #define TFA989X_I2SREG_RCV 2 /* receiver mode */ 24 #define TFA989X_I2SREG_CHSA 6 /* amplifier input select */ 25 #define TFA989X_I2SREG_CHSA_MSK GENMASK(7, 6) 26 #define TFA989X_I2SREG_I2SSR 12 /* sample rate */ 27 #define TFA989X_I2SREG_I2SSR_MSK GENMASK(15, 12) 28 #define TFA989X_BAT_PROT 0x05 29 #define TFA989X_AUDIO_CTR 0x06 30 #define TFA989X_DCDCBOOST 0x07 31 #define TFA989X_SPKR_CALIBRATION 0x08 32 #define TFA989X_SYS_CTRL 0x09 33 #define TFA989X_SYS_CTRL_PWDN 0 /* power down */ 34 #define TFA989X_SYS_CTRL_I2CR 1 /* I2C reset */ 35 #define TFA989X_SYS_CTRL_CFE 2 /* enable CoolFlux DSP */ 36 #define TFA989X_SYS_CTRL_AMPE 3 /* enable amplifier */ 37 #define TFA989X_SYS_CTRL_DCA 4 /* enable boost */ 38 #define TFA989X_SYS_CTRL_SBSL 5 /* DSP configured */ 39 #define TFA989X_SYS_CTRL_AMPC 6 /* amplifier enabled by DSP */ 40 #define TFA989X_I2S_SEL_REG 0x0a 41 #define TFA989X_I2S_SEL_REG_SPKR_MSK GENMASK(10, 9) /* speaker impedance */ 42 #define TFA989X_I2S_SEL_REG_DCFG_MSK GENMASK(14, 11) /* DCDC compensation */ 43 #define TFA989X_HIDE_UNHIDE_KEY 0x40 44 #define TFA989X_PWM_CONTROL 0x41 45 #define TFA989X_CURRENTSENSE1 0x46 46 #define TFA989X_CURRENTSENSE2 0x47 47 #define TFA989X_CURRENTSENSE3 0x48 48 #define TFA989X_CURRENTSENSE4 0x49 49 50 #define TFA9890_REVISION 0x80 51 #define TFA9895_REVISION 0x12 52 #define TFA9897_REVISION 0x97 53 54 struct tfa989x_rev { 55 unsigned int rev; 56 int (*init)(struct regmap *regmap); 57 }; 58 59 struct tfa989x { 60 const struct tfa989x_rev *rev; 61 struct regulator *vddd_supply; 62 struct gpio_desc *rcv_gpiod; 63 }; 64 65 static bool tfa989x_writeable_reg(struct device *dev, unsigned int reg) 66 { 67 return reg > TFA989X_REVISIONNUMBER; 68 } 69 70 static bool tfa989x_volatile_reg(struct device *dev, unsigned int reg) 71 { 72 return reg < TFA989X_REVISIONNUMBER; 73 } 74 75 static const struct regmap_config tfa989x_regmap = { 76 .reg_bits = 8, 77 .val_bits = 16, 78 79 .writeable_reg = tfa989x_writeable_reg, 80 .volatile_reg = tfa989x_volatile_reg, 81 .cache_type = REGCACHE_RBTREE, 82 }; 83 84 static const char * const chsa_text[] = { "Left", "Right", /* "DSP" */ }; 85 static SOC_ENUM_SINGLE_DECL(chsa_enum, TFA989X_I2SREG, TFA989X_I2SREG_CHSA, chsa_text); 86 static const struct snd_kcontrol_new chsa_mux = SOC_DAPM_ENUM("Amp Input", chsa_enum); 87 88 static const struct snd_soc_dapm_widget tfa989x_dapm_widgets[] = { 89 SND_SOC_DAPM_OUTPUT("OUT"), 90 SND_SOC_DAPM_SUPPLY("POWER", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_PWDN, 1, NULL, 0), 91 SND_SOC_DAPM_OUT_DRV("AMPE", TFA989X_SYS_CTRL, TFA989X_SYS_CTRL_AMPE, 0, NULL, 0), 92 93 SND_SOC_DAPM_MUX("Amp Input", SND_SOC_NOPM, 0, 0, &chsa_mux), 94 SND_SOC_DAPM_AIF_IN("AIFINL", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0), 95 SND_SOC_DAPM_AIF_IN("AIFINR", "HiFi Playback", 1, SND_SOC_NOPM, 0, 0), 96 }; 97 98 static const struct snd_soc_dapm_route tfa989x_dapm_routes[] = { 99 {"OUT", NULL, "AMPE"}, 100 {"AMPE", NULL, "POWER"}, 101 {"AMPE", NULL, "Amp Input"}, 102 {"Amp Input", "Left", "AIFINL"}, 103 {"Amp Input", "Right", "AIFINR"}, 104 }; 105 106 static int tfa989x_put_mode(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 107 { 108 struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); 109 struct tfa989x *tfa989x = snd_soc_component_get_drvdata(component); 110 111 gpiod_set_value_cansleep(tfa989x->rcv_gpiod, ucontrol->value.enumerated.item[0]); 112 113 return snd_soc_put_enum_double(kcontrol, ucontrol); 114 } 115 116 static const char * const mode_text[] = { "Speaker", "Receiver" }; 117 static SOC_ENUM_SINGLE_DECL(mode_enum, TFA989X_I2SREG, TFA989X_I2SREG_RCV, mode_text); 118 static const struct snd_kcontrol_new tfa989x_mode_controls[] = { 119 SOC_ENUM_EXT("Mode", mode_enum, snd_soc_get_enum_double, tfa989x_put_mode), 120 }; 121 122 static int tfa989x_probe(struct snd_soc_component *component) 123 { 124 struct tfa989x *tfa989x = snd_soc_component_get_drvdata(component); 125 126 if (tfa989x->rev->rev == TFA9897_REVISION) 127 return snd_soc_add_component_controls(component, tfa989x_mode_controls, 128 ARRAY_SIZE(tfa989x_mode_controls)); 129 130 return 0; 131 } 132 133 static const struct snd_soc_component_driver tfa989x_component = { 134 .probe = tfa989x_probe, 135 .dapm_widgets = tfa989x_dapm_widgets, 136 .num_dapm_widgets = ARRAY_SIZE(tfa989x_dapm_widgets), 137 .dapm_routes = tfa989x_dapm_routes, 138 .num_dapm_routes = ARRAY_SIZE(tfa989x_dapm_routes), 139 .use_pmdown_time = 1, 140 .endianness = 1, 141 }; 142 143 static const unsigned int tfa989x_rates[] = { 144 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 145 }; 146 147 static int tfa989x_find_sample_rate(unsigned int rate) 148 { 149 int i; 150 151 for (i = 0; i < ARRAY_SIZE(tfa989x_rates); ++i) 152 if (tfa989x_rates[i] == rate) 153 return i; 154 155 return -EINVAL; 156 } 157 158 static int tfa989x_hw_params(struct snd_pcm_substream *substream, 159 struct snd_pcm_hw_params *params, 160 struct snd_soc_dai *dai) 161 { 162 struct snd_soc_component *component = dai->component; 163 int sr; 164 165 sr = tfa989x_find_sample_rate(params_rate(params)); 166 if (sr < 0) 167 return sr; 168 169 return snd_soc_component_update_bits(component, TFA989X_I2SREG, 170 TFA989X_I2SREG_I2SSR_MSK, 171 sr << TFA989X_I2SREG_I2SSR); 172 } 173 174 static const struct snd_soc_dai_ops tfa989x_dai_ops = { 175 .hw_params = tfa989x_hw_params, 176 }; 177 178 static struct snd_soc_dai_driver tfa989x_dai = { 179 .name = "tfa989x-hifi", 180 .playback = { 181 .stream_name = "HiFi Playback", 182 .formats = SNDRV_PCM_FMTBIT_S16_LE, 183 .rates = SNDRV_PCM_RATE_8000_48000, 184 .rate_min = 8000, 185 .rate_max = 48000, 186 .channels_min = 1, 187 .channels_max = 2, 188 }, 189 .ops = &tfa989x_dai_ops, 190 }; 191 192 static int tfa9890_init(struct regmap *regmap) 193 { 194 int ret; 195 196 /* temporarily allow access to hidden registers */ 197 ret = regmap_write(regmap, TFA989X_HIDE_UNHIDE_KEY, 0x5a6b); 198 if (ret) 199 return ret; 200 201 /* update PLL registers */ 202 ret = regmap_set_bits(regmap, 0x59, 0x3); 203 if (ret) 204 return ret; 205 206 /* hide registers again */ 207 ret = regmap_write(regmap, TFA989X_HIDE_UNHIDE_KEY, 0x0000); 208 if (ret) 209 return ret; 210 211 return regmap_write(regmap, TFA989X_CURRENTSENSE2, 0x7BE1); 212 } 213 214 static const struct tfa989x_rev tfa9890_rev = { 215 .rev = TFA9890_REVISION, 216 .init = tfa9890_init, 217 }; 218 219 static const struct reg_sequence tfa9895_reg_init[] = { 220 /* some other registers must be set for optimal amplifier behaviour */ 221 { TFA989X_BAT_PROT, 0x13ab }, 222 { TFA989X_AUDIO_CTR, 0x001f }, 223 224 /* peak voltage protection is always on, but may be written */ 225 { TFA989X_SPKR_CALIBRATION, 0x3c4e }, 226 227 /* TFA989X_SYSCTRL_DCA = 0 */ 228 { TFA989X_SYS_CTRL, 0x024d }, 229 { TFA989X_PWM_CONTROL, 0x0308 }, 230 { TFA989X_CURRENTSENSE4, 0x0e82 }, 231 }; 232 233 static int tfa9895_init(struct regmap *regmap) 234 { 235 return regmap_multi_reg_write(regmap, tfa9895_reg_init, 236 ARRAY_SIZE(tfa9895_reg_init)); 237 } 238 239 static const struct tfa989x_rev tfa9895_rev = { 240 .rev = TFA9895_REVISION, 241 .init = tfa9895_init, 242 }; 243 244 static int tfa9897_init(struct regmap *regmap) 245 { 246 int ret; 247 248 /* Reduce slewrate by clearing iddqtestbst to avoid booster damage */ 249 ret = regmap_write(regmap, TFA989X_CURRENTSENSE3, 0x0300); 250 if (ret) 251 return ret; 252 253 /* Enable clipping */ 254 ret = regmap_clear_bits(regmap, TFA989X_CURRENTSENSE4, 0x1); 255 if (ret) 256 return ret; 257 258 /* Set required TDM configuration */ 259 return regmap_write(regmap, 0x14, 0x0); 260 } 261 262 static const struct tfa989x_rev tfa9897_rev = { 263 .rev = TFA9897_REVISION, 264 .init = tfa9897_init, 265 }; 266 267 /* 268 * Note: At the moment this driver bypasses the "CoolFlux DSP" built into the 269 * TFA989X amplifiers. Unfortunately, there seems to be absolutely 270 * no documentation for it - the public "short datasheets" do not provide 271 * any information about the DSP or available registers. 272 * 273 * Usually the TFA989X amplifiers are configured through proprietary userspace 274 * libraries. There are also some (rather complex) kernel drivers but even those 275 * rely on obscure firmware blobs for configuration (so-called "containers"). 276 * They seem to contain different "profiles" with tuned speaker settings, sample 277 * rates and volume steps (which would be better exposed as separate ALSA mixers). 278 * 279 * Bypassing the DSP disables volume control (and perhaps some speaker 280 * optimization?), but at least allows using the speaker without obscure 281 * kernel drivers and firmware. 282 * 283 * Ideally NXP (or now Goodix) should release proper documentation for these 284 * amplifiers so that support for the "CoolFlux DSP" can be implemented properly. 285 */ 286 static int tfa989x_dsp_bypass(struct regmap *regmap) 287 { 288 int ret; 289 290 /* Clear CHSA to bypass DSP and take input from I2S 1 left channel */ 291 ret = regmap_clear_bits(regmap, TFA989X_I2SREG, TFA989X_I2SREG_CHSA_MSK); 292 if (ret) 293 return ret; 294 295 /* Set DCDC compensation to off and speaker impedance to 8 ohm */ 296 ret = regmap_update_bits(regmap, TFA989X_I2S_SEL_REG, 297 TFA989X_I2S_SEL_REG_DCFG_MSK | 298 TFA989X_I2S_SEL_REG_SPKR_MSK, 299 TFA989X_I2S_SEL_REG_SPKR_MSK); 300 if (ret) 301 return ret; 302 303 /* Set DCDC to follower mode and disable CoolFlux DSP */ 304 return regmap_clear_bits(regmap, TFA989X_SYS_CTRL, 305 BIT(TFA989X_SYS_CTRL_DCA) | 306 BIT(TFA989X_SYS_CTRL_CFE) | 307 BIT(TFA989X_SYS_CTRL_AMPC)); 308 } 309 310 static void tfa989x_regulator_disable(void *data) 311 { 312 struct tfa989x *tfa989x = data; 313 314 regulator_disable(tfa989x->vddd_supply); 315 } 316 317 static int tfa989x_i2c_probe(struct i2c_client *i2c) 318 { 319 struct device *dev = &i2c->dev; 320 const struct tfa989x_rev *rev; 321 struct tfa989x *tfa989x; 322 struct regmap *regmap; 323 unsigned int val; 324 int ret; 325 326 rev = device_get_match_data(dev); 327 if (!rev) { 328 dev_err(dev, "unknown device revision\n"); 329 return -ENODEV; 330 } 331 332 tfa989x = devm_kzalloc(dev, sizeof(*tfa989x), GFP_KERNEL); 333 if (!tfa989x) 334 return -ENOMEM; 335 336 tfa989x->rev = rev; 337 i2c_set_clientdata(i2c, tfa989x); 338 339 tfa989x->vddd_supply = devm_regulator_get(dev, "vddd"); 340 if (IS_ERR(tfa989x->vddd_supply)) 341 return dev_err_probe(dev, PTR_ERR(tfa989x->vddd_supply), 342 "Failed to get vddd regulator\n"); 343 344 if (tfa989x->rev->rev == TFA9897_REVISION) { 345 tfa989x->rcv_gpiod = devm_gpiod_get_optional(dev, "rcv", GPIOD_OUT_LOW); 346 if (IS_ERR(tfa989x->rcv_gpiod)) 347 return PTR_ERR(tfa989x->rcv_gpiod); 348 } 349 350 regmap = devm_regmap_init_i2c(i2c, &tfa989x_regmap); 351 if (IS_ERR(regmap)) 352 return PTR_ERR(regmap); 353 354 ret = regulator_enable(tfa989x->vddd_supply); 355 if (ret) { 356 dev_err(dev, "Failed to enable vddd regulator: %d\n", ret); 357 return ret; 358 } 359 360 ret = devm_add_action_or_reset(dev, tfa989x_regulator_disable, tfa989x); 361 if (ret) 362 return ret; 363 364 /* Bypass regcache for reset and init sequence */ 365 regcache_cache_bypass(regmap, true); 366 367 /* Dummy read to generate i2c clocks, required on some devices */ 368 regmap_read(regmap, TFA989X_REVISIONNUMBER, &val); 369 370 ret = regmap_read(regmap, TFA989X_REVISIONNUMBER, &val); 371 if (ret) { 372 dev_err(dev, "failed to read revision number: %d\n", ret); 373 return ret; 374 } 375 376 val &= TFA989X_REVISIONNUMBER_REV_MSK; 377 if (val != rev->rev) { 378 dev_err(dev, "invalid revision number, expected %#x, got %#x\n", 379 rev->rev, val); 380 return -ENODEV; 381 } 382 383 ret = regmap_write(regmap, TFA989X_SYS_CTRL, BIT(TFA989X_SYS_CTRL_I2CR)); 384 if (ret) { 385 dev_err(dev, "failed to reset I2C registers: %d\n", ret); 386 return ret; 387 } 388 389 ret = rev->init(regmap); 390 if (ret) { 391 dev_err(dev, "failed to initialize registers: %d\n", ret); 392 return ret; 393 } 394 395 ret = tfa989x_dsp_bypass(regmap); 396 if (ret) { 397 dev_err(dev, "failed to enable DSP bypass: %d\n", ret); 398 return ret; 399 } 400 regcache_cache_bypass(regmap, false); 401 402 return devm_snd_soc_register_component(dev, &tfa989x_component, 403 &tfa989x_dai, 1); 404 } 405 406 static const struct of_device_id tfa989x_of_match[] = { 407 { .compatible = "nxp,tfa9890", .data = &tfa9890_rev }, 408 { .compatible = "nxp,tfa9895", .data = &tfa9895_rev }, 409 { .compatible = "nxp,tfa9897", .data = &tfa9897_rev }, 410 { } 411 }; 412 MODULE_DEVICE_TABLE(of, tfa989x_of_match); 413 414 static struct i2c_driver tfa989x_i2c_driver = { 415 .driver = { 416 .name = "tfa989x", 417 .of_match_table = tfa989x_of_match, 418 }, 419 .probe_new = tfa989x_i2c_probe, 420 }; 421 module_i2c_driver(tfa989x_i2c_driver); 422 423 MODULE_DESCRIPTION("ASoC NXP/Goodix TFA989X (TFA1) driver"); 424 MODULE_AUTHOR("Stephan Gerhold <stephan@gerhold.net>"); 425 MODULE_LICENSE("GPL"); 426