1 /* 2 * TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec 3 * 4 * Copyright (C) 2016 Axentia Technologies AB 5 * 6 * Author: Peter Rosin <peda@axentia.se> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 /* 14 * loop1 relays 15 * IN1 +---o +------------+ o---+ OUT1 16 * \ / 17 * + + 18 * | / | 19 * +--o +--. | 20 * | add | | 21 * | V | 22 * | .---. | 23 * DAC +----------->|Sum|---+ 24 * | '---' | 25 * | | 26 * + + 27 * 28 * IN2 +---o--+------------+--o---+ OUT2 29 * loop2 relays 30 * 31 * The 'loop1' gpio pin controlls two relays, which are either in loop 32 * position, meaning that input and output are directly connected, or 33 * they are in mixer position, meaning that the signal is passed through 34 * the 'Sum' mixer. Similarly for 'loop2'. 35 * 36 * In the above, the 'loop1' relays are inactive, thus feeding IN1 to the 37 * mixer (if 'add' is active) and feeding the mixer output to OUT1. The 38 * 'loop2' relays are active, short-cutting the TSE-850 from channel 2. 39 * IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name 40 * of the (filtered) output from the PCM5142 codec. 41 */ 42 43 #include <linux/clk.h> 44 #include <linux/gpio.h> 45 #include <linux/module.h> 46 #include <linux/of.h> 47 #include <linux/of_device.h> 48 #include <linux/of_gpio.h> 49 #include <linux/regulator/consumer.h> 50 51 #include <sound/soc.h> 52 #include <sound/pcm_params.h> 53 54 struct tse850_priv { 55 struct gpio_desc *add; 56 struct gpio_desc *loop1; 57 struct gpio_desc *loop2; 58 59 struct regulator *ana; 60 61 int add_cache; 62 int loop1_cache; 63 int loop2_cache; 64 }; 65 66 static int tse850_get_mux1(struct snd_kcontrol *kctrl, 67 struct snd_ctl_elem_value *ucontrol) 68 { 69 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 70 struct snd_soc_card *card = dapm->card; 71 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 72 73 ucontrol->value.enumerated.item[0] = tse850->loop1_cache; 74 75 return 0; 76 } 77 78 static int tse850_put_mux1(struct snd_kcontrol *kctrl, 79 struct snd_ctl_elem_value *ucontrol) 80 { 81 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 82 struct snd_soc_card *card = dapm->card; 83 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 84 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 85 unsigned int val = ucontrol->value.enumerated.item[0]; 86 87 if (val >= e->items) 88 return -EINVAL; 89 90 gpiod_set_value_cansleep(tse850->loop1, val); 91 tse850->loop1_cache = val; 92 93 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 94 } 95 96 static int tse850_get_mux2(struct snd_kcontrol *kctrl, 97 struct snd_ctl_elem_value *ucontrol) 98 { 99 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 100 struct snd_soc_card *card = dapm->card; 101 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 102 103 ucontrol->value.enumerated.item[0] = tse850->loop2_cache; 104 105 return 0; 106 } 107 108 static int tse850_put_mux2(struct snd_kcontrol *kctrl, 109 struct snd_ctl_elem_value *ucontrol) 110 { 111 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 112 struct snd_soc_card *card = dapm->card; 113 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 114 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 115 unsigned int val = ucontrol->value.enumerated.item[0]; 116 117 if (val >= e->items) 118 return -EINVAL; 119 120 gpiod_set_value_cansleep(tse850->loop2, val); 121 tse850->loop2_cache = val; 122 123 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 124 } 125 126 int tse850_get_mix(struct snd_kcontrol *kctrl, 127 struct snd_ctl_elem_value *ucontrol) 128 { 129 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 130 struct snd_soc_card *card = dapm->card; 131 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 132 133 ucontrol->value.enumerated.item[0] = tse850->add_cache; 134 135 return 0; 136 } 137 138 int tse850_put_mix(struct snd_kcontrol *kctrl, 139 struct snd_ctl_elem_value *ucontrol) 140 { 141 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 142 struct snd_soc_card *card = dapm->card; 143 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 144 int connect = !!ucontrol->value.integer.value[0]; 145 146 if (tse850->add_cache == connect) 147 return 0; 148 149 /* 150 * Hmmm, this gpiod_set_value_cansleep call should probably happen 151 * inside snd_soc_dapm_mixer_update_power in the loop. 152 */ 153 gpiod_set_value_cansleep(tse850->add, connect); 154 tse850->add_cache = connect; 155 156 snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL); 157 return 1; 158 } 159 160 int tse850_get_ana(struct snd_kcontrol *kctrl, 161 struct snd_ctl_elem_value *ucontrol) 162 { 163 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 164 struct snd_soc_card *card = dapm->card; 165 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 166 int ret; 167 168 ret = regulator_get_voltage(tse850->ana); 169 if (ret < 0) 170 return ret; 171 172 /* 173 * Map regulator output values like so: 174 * -11.5V to "Low" (enum 0) 175 * 11.5V-12.5V to "12V" (enum 1) 176 * 12.5V-13.5V to "13V" (enum 2) 177 * ... 178 * 18.5V-19.5V to "19V" (enum 8) 179 * 19.5V- to "20V" (enum 9) 180 */ 181 if (ret < 11000000) 182 ret = 11000000; 183 else if (ret > 20000000) 184 ret = 20000000; 185 ret -= 11000000; 186 ret = (ret + 500000) / 1000000; 187 188 ucontrol->value.enumerated.item[0] = ret; 189 190 return 0; 191 } 192 193 int tse850_put_ana(struct snd_kcontrol *kctrl, 194 struct snd_ctl_elem_value *ucontrol) 195 { 196 struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl); 197 struct snd_soc_card *card = dapm->card; 198 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 199 struct soc_enum *e = (struct soc_enum *)kctrl->private_value; 200 unsigned int uV = ucontrol->value.enumerated.item[0]; 201 int ret; 202 203 if (uV >= e->items) 204 return -EINVAL; 205 206 /* 207 * Map enum zero (Low) to 2 volts on the regulator, do this since 208 * the ana regulator is supplied by the system 12V voltage and 209 * requesting anything below the system voltage causes the system 210 * voltage to be passed through the regulator. Also, the ana 211 * regulator induces noise when requesting voltages near the 212 * system voltage. So, by mapping Low to 2V, that noise is 213 * eliminated when all that is needed is 12V (the system voltage). 214 */ 215 if (uV) 216 uV = 11000000 + (1000000 * uV); 217 else 218 uV = 2000000; 219 220 ret = regulator_set_voltage(tse850->ana, uV, uV); 221 if (ret < 0) 222 return ret; 223 224 return snd_soc_dapm_put_enum_double(kctrl, ucontrol); 225 } 226 227 static const char * const mux_text[] = { "Mixer", "Loop" }; 228 229 static const struct soc_enum mux_enum = 230 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text); 231 232 static const struct snd_kcontrol_new mux1 = 233 SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1); 234 235 static const struct snd_kcontrol_new mux2 = 236 SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2); 237 238 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \ 239 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \ 240 .info = snd_soc_info_volsw, \ 241 .get = xget, \ 242 .put = xput, \ 243 .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) } 244 245 static const struct snd_kcontrol_new mix[] = { 246 TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0, 247 tse850_get_mix, tse850_put_mix), 248 }; 249 250 static const char * const ana_text[] = { 251 "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V" 252 }; 253 254 static const struct soc_enum ana_enum = 255 SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text); 256 257 static const struct snd_kcontrol_new out = 258 SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana); 259 260 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = { 261 SND_SOC_DAPM_LINE("OUT1", NULL), 262 SND_SOC_DAPM_LINE("OUT2", NULL), 263 SND_SOC_DAPM_LINE("IN1", NULL), 264 SND_SOC_DAPM_LINE("IN2", NULL), 265 SND_SOC_DAPM_INPUT("DAC"), 266 SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0), 267 SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0), 268 SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix), 269 SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1), 270 SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2), 271 SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1), 272 }; 273 274 /* 275 * These connections are not entirely correct, since both IN1 and IN2 276 * are always fed to MIX (if the "IN switch" is set so), i.e. without 277 * regard to the loop1 and loop2 relays that according to this only 278 * control MUX1 and MUX2 but in fact also control how the input signals 279 * are routed. 280 * But, 1) I don't know how to do it right, and 2) it doesn't seem to 281 * matter in practice since nothing is powered in those sections anyway. 282 */ 283 static const struct snd_soc_dapm_route tse850_intercon[] = { 284 { "OUT1", NULL, "MUX1" }, 285 { "OUT2", NULL, "MUX2" }, 286 287 { "MUX1", "Loop", "IN1" }, 288 { "MUX1", "Mixer", "OUT" }, 289 290 { "MUX2", "Loop", "IN2" }, 291 { "MUX2", "Mixer", "OUT" }, 292 293 { "OUT", NULL, "MIX" }, 294 295 { "MIX", NULL, "DAC" }, 296 { "MIX", "IN Switch", "IN1" }, 297 { "MIX", "IN Switch", "IN2" }, 298 299 /* connect board input to the codec left channel output pin */ 300 { "DAC", NULL, "OUTL" }, 301 }; 302 303 static struct snd_soc_dai_link tse850_dailink = { 304 .name = "TSE-850", 305 .stream_name = "TSE-850-PCM", 306 .codec_dai_name = "pcm512x-hifi", 307 .dai_fmt = SND_SOC_DAIFMT_I2S 308 | SND_SOC_DAIFMT_NB_NF 309 | SND_SOC_DAIFMT_CBM_CFS, 310 }; 311 312 static struct snd_soc_card tse850_card = { 313 .name = "TSE-850-ASoC", 314 .owner = THIS_MODULE, 315 .dai_link = &tse850_dailink, 316 .num_links = 1, 317 .dapm_widgets = tse850_dapm_widgets, 318 .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets), 319 .dapm_routes = tse850_intercon, 320 .num_dapm_routes = ARRAY_SIZE(tse850_intercon), 321 .fully_routed = true, 322 }; 323 324 static int tse850_dt_init(struct platform_device *pdev) 325 { 326 struct device_node *np = pdev->dev.of_node; 327 struct device_node *codec_np, *cpu_np; 328 struct snd_soc_dai_link *dailink = &tse850_dailink; 329 330 if (!np) { 331 dev_err(&pdev->dev, "only device tree supported\n"); 332 return -EINVAL; 333 } 334 335 cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0); 336 if (!cpu_np) { 337 dev_err(&pdev->dev, "failed to get cpu dai\n"); 338 return -EINVAL; 339 } 340 dailink->cpu_of_node = cpu_np; 341 dailink->platform_of_node = cpu_np; 342 of_node_put(cpu_np); 343 344 codec_np = of_parse_phandle(np, "axentia,audio-codec", 0); 345 if (!codec_np) { 346 dev_err(&pdev->dev, "failed to get codec info\n"); 347 return -EINVAL; 348 } 349 dailink->codec_of_node = codec_np; 350 of_node_put(codec_np); 351 352 return 0; 353 } 354 355 static int tse850_probe(struct platform_device *pdev) 356 { 357 struct snd_soc_card *card = &tse850_card; 358 struct device *dev = card->dev = &pdev->dev; 359 struct tse850_priv *tse850; 360 int ret; 361 362 tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL); 363 if (!tse850) 364 return -ENOMEM; 365 366 snd_soc_card_set_drvdata(card, tse850); 367 368 ret = tse850_dt_init(pdev); 369 if (ret) { 370 dev_err(dev, "failed to init dt info\n"); 371 return ret; 372 } 373 374 tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH); 375 if (IS_ERR(tse850->add)) { 376 if (PTR_ERR(tse850->add) != -EPROBE_DEFER) 377 dev_err(dev, "failed to get 'add' gpio\n"); 378 return PTR_ERR(tse850->add); 379 } 380 tse850->add_cache = 1; 381 382 tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH); 383 if (IS_ERR(tse850->loop1)) { 384 if (PTR_ERR(tse850->loop1) != -EPROBE_DEFER) 385 dev_err(dev, "failed to get 'loop1' gpio\n"); 386 return PTR_ERR(tse850->loop1); 387 } 388 tse850->loop1_cache = 1; 389 390 tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH); 391 if (IS_ERR(tse850->loop2)) { 392 if (PTR_ERR(tse850->loop2) != -EPROBE_DEFER) 393 dev_err(dev, "failed to get 'loop2' gpio\n"); 394 return PTR_ERR(tse850->loop2); 395 } 396 tse850->loop2_cache = 1; 397 398 tse850->ana = devm_regulator_get(dev, "axentia,ana"); 399 if (IS_ERR(tse850->ana)) { 400 if (PTR_ERR(tse850->ana) != -EPROBE_DEFER) 401 dev_err(dev, "failed to get 'ana' regulator\n"); 402 return PTR_ERR(tse850->ana); 403 } 404 405 ret = regulator_enable(tse850->ana); 406 if (ret < 0) { 407 dev_err(dev, "failed to enable the 'ana' regulator\n"); 408 return ret; 409 } 410 411 ret = snd_soc_register_card(card); 412 if (ret) { 413 dev_err(dev, "snd_soc_register_card failed\n"); 414 goto err_disable_ana; 415 } 416 417 return 0; 418 419 err_disable_ana: 420 regulator_disable(tse850->ana); 421 return ret; 422 } 423 424 static int tse850_remove(struct platform_device *pdev) 425 { 426 struct snd_soc_card *card = platform_get_drvdata(pdev); 427 struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card); 428 429 snd_soc_unregister_card(card); 430 regulator_disable(tse850->ana); 431 432 return 0; 433 } 434 435 static const struct of_device_id tse850_dt_ids[] = { 436 { .compatible = "axentia,tse850-pcm5142", }, 437 { /* sentinel */ } 438 }; 439 MODULE_DEVICE_TABLE(of, tse850_dt_ids); 440 441 static struct platform_driver tse850_driver = { 442 .driver = { 443 .name = "axentia-tse850-pcm5142", 444 .of_match_table = of_match_ptr(tse850_dt_ids), 445 }, 446 .probe = tse850_probe, 447 .remove = tse850_remove, 448 }; 449 450 module_platform_driver(tse850_driver); 451 452 /* Module information */ 453 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>"); 454 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec"); 455 MODULE_LICENSE("GPL"); 456