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
tfa989x_writeable_reg(struct device * dev,unsigned int reg)65 static bool tfa989x_writeable_reg(struct device *dev, unsigned int reg)
66 {
67 return reg > TFA989X_REVISIONNUMBER;
68 }
69
tfa989x_volatile_reg(struct device * dev,unsigned int reg)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
tfa989x_put_mode(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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
tfa989x_probe(struct snd_soc_component * component)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
tfa989x_find_sample_rate(unsigned int rate)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
tfa989x_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)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
tfa9890_init(struct regmap * regmap)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
tfa9895_init(struct regmap * regmap)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
tfa9897_init(struct regmap * regmap)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 */
tfa989x_dsp_bypass(struct regmap * regmap)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
tfa989x_regulator_disable(void * data)310 static void tfa989x_regulator_disable(void *data)
311 {
312 struct tfa989x *tfa989x = data;
313
314 regulator_disable(tfa989x->vddd_supply);
315 }
316
tfa989x_i2c_probe(struct i2c_client * i2c)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 = 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
