1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec 4 // 5 // Copyright (C) 2016 Axentia Technologies AB 6 // 7 // Author: Peter Rosin <peda@axentia.se> 8 // 9 // loop1 relays 10 // IN1 +---o +------------+ o---+ OUT1 11 // \ / 12 // + + 13 // | / | 14 // +--o +--. | 15 // | add | | 16 // | V | 17 // | .---. | 18 // DAC +----------->|Sum|---+ 19 // | '---' | 20 // | | 21 // + + 22 // 23 // IN2 +---o--+------------+--o---+ OUT2 24 // loop2 relays 25 // 26 // The 'loop1' gpio pin controls two relays, which are either in loop 27 // position, meaning that input and output are directly connected, or 28 // they are in mixer position, meaning that the signal is passed through 29 // the 'Sum' mixer. Similarly for 'loop2'. 30 // 31 // In the above, the 'loop1' relays are inactive, thus feeding IN1 to the 32 // mixer (if 'add' is active) and feeding the mixer output to OUT1. The 33 // 'loop2' relays are active, short-cutting the TSE-850 from channel 2. 34 // IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name 35 // of the (filtered) output from the PCM5142 codec. 36 37 #include <linux/clk.h> 38 #include <linux/gpio.h> 39 #include <linux/module.h> 40 #include <linux/of.h> 41 #include <linux/of_gpio.h> 42 #include <linux/regulator/consumer.h> 43 44 #include <sound/soc.h> 45 #include <sound/pcm_params.h> 46 47 struct tse850_priv { 48 struct gpio_desc *add; 49 struct gpio_desc *loop1; 50 struct gpio_desc *loop2; 51 52 struct regulator *ana; 53 54 int add_cache; 55 int loop1_cache; 56 int loop2_cache; 57 }; 58 59 static int tse850_get_mux1(struct snd_kcontrol *kctrl, 60 struct snd_ctl_elem_value *ucontrol) 61 { 62 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 63 struct snd_soc_card *card = dapm->card; 64 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 65 66 ucontrol->value.enumerated.item[0] = tse850->loop1_cache; 67 68 return 0; 69 } 70 71 static int tse850_put_mux1(struct snd_kcontrol *kctrl, 72 struct snd_ctl_elem_value *ucontrol) 73 { 74 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 75 struct snd_soc_card *card = dapm->card; 76 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 77 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 78 unsigned int val = ucontrol->value.enumerated.item[0]; 79 80 if (val >= e->items) 81 return -EINVAL; 82 83 gpiod_set_value_cansleep(tse850->loop1, val); 84 tse850->loop1_cache = val; 85 86 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 87 } 88 89 static int tse850_get_mux2(struct snd_kcontrol *kctrl, 90 struct snd_ctl_elem_value *ucontrol) 91 { 92 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 93 struct snd_soc_card *card = dapm->card; 94 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 95 96 ucontrol->value.enumerated.item[0] = tse850->loop2_cache; 97 98 return 0; 99 } 100 101 static int tse850_put_mux2(struct snd_kcontrol *kctrl, 102 struct snd_ctl_elem_value *ucontrol) 103 { 104 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 105 struct snd_soc_card *card = dapm->card; 106 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 107 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 108 unsigned int val = ucontrol->value.enumerated.item[0]; 109 110 if (val >= e->items) 111 return -EINVAL; 112 113 gpiod_set_value_cansleep(tse850->loop2, val); 114 tse850->loop2_cache = val; 115 116 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 117 } 118 119 static int tse850_get_mix(struct snd_kcontrol *kctrl, 120 struct snd_ctl_elem_value *ucontrol) 121 { 122 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 123 struct snd_soc_card *card = dapm->card; 124 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 125 126 ucontrol->value.enumerated.item[0] = tse850->add_cache; 127 128 return 0; 129 } 130 131 static int tse850_put_mix(struct snd_kcontrol *kctrl, 132 struct snd_ctl_elem_value *ucontrol) 133 { 134 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 135 struct snd_soc_card *card = dapm->card; 136 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 137 int connect = !!ucontrol->value.integer.value[0]; 138 139 if (tse850->add_cache == connect) 140 return 0; 141 142 /* 143 * Hmmm, this gpiod_set_value_cansleep call should probably happen 144 * inside snd_soc_dapm_mixer_update_power in the loop. 145 */ 146 gpiod_set_value_cansleep(tse850->add, connect); 147 tse850->add_cache = connect; 148 149 snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL); 150 return 1; 151 } 152 153 static int tse850_get_ana(struct snd_kcontrol *kctrl, 154 struct snd_ctl_elem_value *ucontrol) 155 { 156 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 157 struct snd_soc_card *card = dapm->card; 158 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 159 int ret; 160 161 ret = regulator_get_voltage(tse850->ana); 162 if (ret < 0) 163 return ret; 164 165 /* 166 * Map regulator output values like so: 167 * -11.5V to "Low" (enum 0) 168 * 11.5V-12.5V to "12V" (enum 1) 169 * 12.5V-13.5V to "13V" (enum 2) 170 * ... 171 * 18.5V-19.5V to "19V" (enum 8) 172 * 19.5V- to "20V" (enum 9) 173 */ 174 if (ret < 11000000) 175 ret = 11000000; 176 else if (ret > 20000000) 177 ret = 20000000; 178 ret -= 11000000; 179 ret = (ret + 500000) / 1000000; 180 181 ucontrol->value.enumerated.item[0] = ret; 182 183 return 0; 184 } 185 186 static int tse850_put_ana(struct snd_kcontrol *kctrl, 187 struct snd_ctl_elem_value *ucontrol) 188 { 189 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 190 struct snd_soc_card *card = dapm->card; 191 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 192 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 193 unsigned int uV = ucontrol->value.enumerated.item[0]; 194 int ret; 195 196 if (uV >= e->items) 197 return -EINVAL; 198 199 /* 200 * Map enum zero (Low) to 2 volts on the regulator, do this since 201 * the ana regulator is supplied by the system 12V voltage and 202 * requesting anything below the system voltage causes the system 203 * voltage to be passed through the regulator. Also, the ana 204 * regulator induces noise when requesting voltages near the 205 * system voltage. So, by mapping Low to 2V, that noise is 206 * eliminated when all that is needed is 12V (the system voltage). 207 */ 208 if (uV) 209 uV = 11000000 + (1000000 * uV); 210 else 211 uV = 2000000; 212 213 ret = regulator_set_voltage(tse850->ana, uV, uV); 214 if (ret < 0) 215 return ret; 216 217 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 218 } 219 220 static const char * const mux_text[] = { "Mixer", "Loop" }; 221 222 static const struct soc_enum mux_enum = 223 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text); 224 225 static const struct snd_kcontrol_new mux1 = 226 SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1); 227 228 static const struct snd_kcontrol_new mux2 = 229 SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2); 230 231 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \ 232 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \ 233 .info = snd_soc_info_volsw, \ 234 .get = xget, \ 235 .put = xput, \ 236 .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) } 237 238 static const struct snd_kcontrol_new mix[] = { 239 TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0, 240 tse850_get_mix, tse850_put_mix), 241 }; 242 243 static const char * const ana_text[] = { 244 "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V" 245 }; 246 247 static const struct soc_enum ana_enum = 248 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text); 249 250 static const struct snd_kcontrol_new out = 251 SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana); 252 253 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = { 254 SND_SOC_DAPM_LINE("OUT1", NULL), 255 SND_SOC_DAPM_LINE("OUT2", NULL), 256 SND_SOC_DAPM_LINE("IN1", NULL), 257 SND_SOC_DAPM_LINE("IN2", NULL), 258 SND_SOC_DAPM_INPUT("DAC"), 259 SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0), 260 SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0), 261 SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix), 262 SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1), 263 SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2), 264 SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1), 265 }; 266 267 /* 268 * These connections are not entirely correct, since both IN1 and IN2 269 * are always fed to MIX (if the "IN switch" is set so), i.e. without 270 * regard to the loop1 and loop2 relays that according to this only 271 * control MUX1 and MUX2 but in fact also control how the input signals 272 * are routed. 273 * But, 1) I don't know how to do it right, and 2) it doesn't seem to 274 * matter in practice since nothing is powered in those sections anyway. 275 */ 276 static const struct snd_soc_dapm_route tse850_intercon[] = { 277 { "OUT1", NULL, "MUX1" }, 278 { "OUT2", NULL, "MUX2" }, 279 280 { "MUX1", "Loop", "IN1" }, 281 { "MUX1", "Mixer", "OUT" }, 282 283 { "MUX2", "Loop", "IN2" }, 284 { "MUX2", "Mixer", "OUT" }, 285 286 { "OUT", NULL, "MIX" }, 287 288 { "MIX", NULL, "DAC" }, 289 { "MIX", "IN Switch", "IN1" }, 290 { "MIX", "IN Switch", "IN2" }, 291 292 /* connect board input to the codec left channel output pin */ 293 { "DAC", NULL, "OUTL" }, 294 }; 295 296 SND_SOC_DAILINK_DEFS(pcm, 297 DAILINK_COMP_ARRAY(COMP_EMPTY()), 298 DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")), 299 DAILINK_COMP_ARRAY(COMP_EMPTY())); 300 301 static struct snd_soc_dai_link tse850_dailink = { 302 .name = "TSE-850", 303 .stream_name = "TSE-850-PCM", 304 .dai_fmt = SND_SOC_DAIFMT_I2S 305 | SND_SOC_DAIFMT_NB_NF 306 | SND_SOC_DAIFMT_CBP_CFC, 307 SND_SOC_DAILINK_REG(pcm), 308 }; 309 310 static struct snd_soc_card tse850_card = { 311 .name = "TSE-850-ASoC", 312 .owner = THIS_MODULE, 313 .dai_link = &tse850_dailink, 314 .num_links = 1, 315 .dapm_widgets = tse850_dapm_widgets, 316 .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets), 317 .dapm_routes = tse850_intercon, 318 .num_dapm_routes = ARRAY_SIZE(tse850_intercon), 319 .fully_routed = true, 320 }; 321 322 static int tse850_dt_init(struct platform_device *pdev) 323 { 324 struct device_node *np = pdev->dev.of_node; 325 struct device_node *codec_np, *cpu_np; 326 struct snd_soc_dai_link *dailink = &tse850_dailink; 327 328 if (!np) { 329 dev_err(&pdev->dev, "only device tree supported\n"); 330 return -EINVAL; 331 } 332 333 cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0); 334 if (!cpu_np) { 335 dev_err(&pdev->dev, "failed to get cpu dai\n"); 336 return -EINVAL; 337 } 338 dailink->cpus->of_node = cpu_np; 339 dailink->platforms->of_node = cpu_np; 340 of_node_put(cpu_np); 341 342 codec_np = of_parse_phandle(np, "axentia,audio-codec", 0); 343 if (!codec_np) { 344 dev_err(&pdev->dev, "failed to get codec info\n"); 345 return -EINVAL; 346 } 347 dailink->codecs->of_node = codec_np; 348 of_node_put(codec_np); 349 350 return 0; 351 } 352 353 static int tse850_probe(struct platform_device *pdev) 354 { 355 struct snd_soc_card *card = &tse850_card; 356 struct device *dev = card->dev = &pdev->dev; 357 struct tse850_priv *tse850; 358 int ret; 359 360 tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL); 361 if (!tse850) 362 return -ENOMEM; 363 364 snd_soc_card_set_drvdata(card, tse850); 365 366 ret = tse850_dt_init(pdev); 367 if (ret) { 368 dev_err(dev, "failed to init dt info\n"); 369 return ret; 370 } 371 372 tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH); 373 if (IS_ERR(tse850->add)) 374 return dev_err_probe(dev, PTR_ERR(tse850->add), 375 "failed to get 'add' gpio\n"); 376 tse850->add_cache = 1; 377 378 tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH); 379 if (IS_ERR(tse850->loop1)) 380 return dev_err_probe(dev, PTR_ERR(tse850->loop1), 381 "failed to get 'loop1' gpio\n"); 382 tse850->loop1_cache = 1; 383 384 tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH); 385 if (IS_ERR(tse850->loop2)) 386 return dev_err_probe(dev, PTR_ERR(tse850->loop2), 387 "failed to get 'loop2' gpio\n"); 388 tse850->loop2_cache = 1; 389 390 tse850->ana = devm_regulator_get(dev, "axentia,ana"); 391 if (IS_ERR(tse850->ana)) 392 return dev_err_probe(dev, PTR_ERR(tse850->ana), 393 "failed to get 'ana' regulator\n"); 394 395 ret = regulator_enable(tse850->ana); 396 if (ret < 0) { 397 dev_err(dev, "failed to enable the 'ana' regulator\n"); 398 return ret; 399 } 400 401 ret = snd_soc_register_card(card); 402 if (ret) { 403 dev_err(dev, "snd_soc_register_card failed\n"); 404 goto err_disable_ana; 405 } 406 407 return 0; 408 409 err_disable_ana: 410 regulator_disable(tse850->ana); 411 return ret; 412 } 413 414 static void tse850_remove(struct platform_device *pdev) 415 { 416 struct snd_soc_card *card = platform_get_drvdata(pdev); 417 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 418 419 snd_soc_unregister_card(card); 420 regulator_disable(tse850->ana); 421 } 422 423 static const struct of_device_id tse850_dt_ids[] = { 424 { .compatible = "axentia,tse850-pcm5142", }, 425 { /* sentinel */ } 426 }; 427 MODULE_DEVICE_TABLE(of, tse850_dt_ids); 428 429 static struct platform_driver tse850_driver = { 430 .driver = { 431 .name = "axentia-tse850-pcm5142", 432 .of_match_table = tse850_dt_ids, 433 }, 434 .probe = tse850_probe, 435 .remove_new = tse850_remove, 436 }; 437 438 module_platform_driver(tse850_driver); 439 440 /* Module information */ 441 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>"); 442 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec"); 443 MODULE_LICENSE("GPL v2"); 444