sound/soc/atmel/tse850-pcm5142.c

   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 controlls 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_device.h>
  42 #include <linux/of_gpio.h>
  43 #include <linux/regulator/consumer.h>
  44
  45 #include <sound/soc.h>
  46 #include <sound/pcm_params.h>
  47
  48 struct tse850_priv {
  49         struct gpio_desc *add;
  50         struct gpio_desc *loop1;
  51         struct gpio_desc *loop2;
  52
  53         struct regulator *ana;
  54
  55         int add_cache;
  56         int loop1_cache;
  57         int loop2_cache;
  58 };
  59
  60 static int tse850_get_mux1(struct snd_kcontrol *kctrl,
  61                            struct snd_ctl_elem_value *ucontrol)
  62 {
  63         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
  64         struct snd_soc_card *card = dapm->card;
  65         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
  66
  67         ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
  68
  69         return 0;
  70 }
  71
  72 static int tse850_put_mux1(struct snd_kcontrol *kctrl,
  73                            struct snd_ctl_elem_value *ucontrol)
  74 {
  75         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
  76         struct snd_soc_card *card = dapm->card;
  77         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
  78         struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
  79         unsigned int val = ucontrol->value.enumerated.item[0];
  80
  81         if (val >= e->items)
  82                 return -EINVAL;
  83
  84         gpiod_set_value_cansleep(tse850->loop1, val);
  85         tse850->loop1_cache = val;
  86
  87         return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
  88 }
  89
  90 static int tse850_get_mux2(struct snd_kcontrol *kctrl,
  91                            struct snd_ctl_elem_value *ucontrol)
  92 {
  93         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
  94         struct snd_soc_card *card = dapm->card;
  95         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
  96
  97         ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
  98
  99         return 0;
 100 }
 101
 102 static int tse850_put_mux2(struct snd_kcontrol *kctrl,
 103                            struct snd_ctl_elem_value *ucontrol)
 104 {
 105         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 106         struct snd_soc_card *card = dapm->card;
 107         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 108         struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
 109         unsigned int val = ucontrol->value.enumerated.item[0];
 110
 111         if (val >= e->items)
 112                 return -EINVAL;
 113
 114         gpiod_set_value_cansleep(tse850->loop2, val);
 115         tse850->loop2_cache = val;
 116
 117         return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
 118 }
 119
 120 static int tse850_get_mix(struct snd_kcontrol *kctrl,
 121                           struct snd_ctl_elem_value *ucontrol)
 122 {
 123         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 124         struct snd_soc_card *card = dapm->card;
 125         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 126
 127         ucontrol->value.enumerated.item[0] = tse850->add_cache;
 128
 129         return 0;
 130 }
 131
 132 static int tse850_put_mix(struct snd_kcontrol *kctrl,
 133                           struct snd_ctl_elem_value *ucontrol)
 134 {
 135         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 136         struct snd_soc_card *card = dapm->card;
 137         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 138         int connect = !!ucontrol->value.integer.value[0];
 139
 140         if (tse850->add_cache == connect)
 141                 return 0;
 142
 143         /*
 144          * Hmmm, this gpiod_set_value_cansleep call should probably happen
 145          * inside snd_soc_dapm_mixer_update_power in the loop.
 146          */
 147         gpiod_set_value_cansleep(tse850->add, connect);
 148         tse850->add_cache = connect;
 149
 150         snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
 151         return 1;
 152 }
 153
 154 static int tse850_get_ana(struct snd_kcontrol *kctrl,
 155                           struct snd_ctl_elem_value *ucontrol)
 156 {
 157         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 158         struct snd_soc_card *card = dapm->card;
 159         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 160         int ret;
 161
 162         ret = regulator_get_voltage(tse850->ana);
 163         if (ret < 0)
 164                 return ret;
 165
 166         /*
 167          * Map regulator output values like so:
 168          *      -11.5V to "Low" (enum 0)
 169          * 11.5V-12.5V to "12V" (enum 1)
 170          * 12.5V-13.5V to "13V" (enum 2)
 171          *     ...
 172          * 18.5V-19.5V to "19V" (enum 8)
 173          * 19.5V-      to "20V" (enum 9)
 174          */
 175         if (ret < 11000000)
 176                 ret = 11000000;
 177         else if (ret > 20000000)
 178                 ret = 20000000;
 179         ret -= 11000000;
 180         ret = (ret + 500000) / 1000000;
 181
 182         ucontrol->value.enumerated.item[0] = ret;
 183
 184         return 0;
 185 }
 186
 187 static int tse850_put_ana(struct snd_kcontrol *kctrl,
 188                           struct snd_ctl_elem_value *ucontrol)
 189 {
 190         struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 191         struct snd_soc_card *card = dapm->card;
 192         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 193         struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
 194         unsigned int uV = ucontrol->value.enumerated.item[0];
 195         int ret;
 196
 197         if (uV >= e->items)
 198                 return -EINVAL;
 199
 200         /*
 201          * Map enum zero (Low) to 2 volts on the regulator, do this since
 202          * the ana regulator is supplied by the system 12V voltage and
 203          * requesting anything below the system voltage causes the system
 204          * voltage to be passed through the regulator. Also, the ana
 205          * regulator induces noise when requesting voltages near the
 206          * system voltage. So, by mapping Low to 2V, that noise is
 207          * eliminated when all that is needed is 12V (the system voltage).
 208          */
 209         if (uV)
 210                 uV = 11000000 + (1000000 * uV);
 211         else
 212                 uV = 2000000;
 213
 214         ret = regulator_set_voltage(tse850->ana, uV, uV);
 215         if (ret < 0)
 216                 return ret;
 217
 218         return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
 219 }
 220
 221 static const char * const mux_text[] = { "Mixer", "Loop" };
 222
 223 static const struct soc_enum mux_enum =
 224         SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
 225
 226 static const struct snd_kcontrol_new mux1 =
 227         SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
 228
 229 static const struct snd_kcontrol_new mux2 =
 230         SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
 231
 232 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
 233 {       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
 234         .info = snd_soc_info_volsw, \
 235         .get = xget, \
 236         .put = xput, \
 237         .private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
 238
 239 static const struct snd_kcontrol_new mix[] = {
 240         TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
 241                                tse850_get_mix, tse850_put_mix),
 242 };
 243
 244 static const char * const ana_text[] = {
 245         "Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
 246 };
 247
 248 static const struct soc_enum ana_enum =
 249         SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
 250
 251 static const struct snd_kcontrol_new out =
 252         SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);
 253
 254 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
 255         SND_SOC_DAPM_LINE("OUT1", NULL),
 256         SND_SOC_DAPM_LINE("OUT2", NULL),
 257         SND_SOC_DAPM_LINE("IN1", NULL),
 258         SND_SOC_DAPM_LINE("IN2", NULL),
 259         SND_SOC_DAPM_INPUT("DAC"),
 260         SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
 261         SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
 262         SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
 263         SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
 264         SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
 265         SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
 266 };
 267
 268 /*
 269  * These connections are not entirely correct, since both IN1 and IN2
 270  * are always fed to MIX (if the "IN switch" is set so), i.e. without
 271  * regard to the loop1 and loop2 relays that according to this only
 272  * control MUX1 and MUX2 but in fact also control how the input signals
 273  * are routed.
 274  * But, 1) I don't know how to do it right, and 2) it doesn't seem to
 275  * matter in practice since nothing is powered in those sections anyway.
 276  */
 277 static const struct snd_soc_dapm_route tse850_intercon[] = {
 278         { "OUT1", NULL, "MUX1" },
 279         { "OUT2", NULL, "MUX2" },
 280
 281         { "MUX1", "Loop",  "IN1" },
 282         { "MUX1", "Mixer", "OUT" },
 283
 284         { "MUX2", "Loop",  "IN2" },
 285         { "MUX2", "Mixer", "OUT" },
 286
 287         { "OUT", NULL, "MIX" },
 288
 289         { "MIX", NULL, "DAC" },
 290         { "MIX", "IN Switch", "IN1" },
 291         { "MIX", "IN Switch", "IN2" },
 292
 293         /* connect board input to the codec left channel output pin */
 294         { "DAC", NULL, "OUTL" },
 295 };
 296
 297 SND_SOC_DAILINK_DEFS(pcm,
 298         DAILINK_COMP_ARRAY(COMP_EMPTY()),
 299         DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
 300         DAILINK_COMP_ARRAY(COMP_EMPTY()));
 301
 302 static struct snd_soc_dai_link tse850_dailink = {
 303         .name = "TSE-850",
 304         .stream_name = "TSE-850-PCM",
 305         .dai_fmt = SND_SOC_DAIFMT_I2S
 306                  | SND_SOC_DAIFMT_NB_NF
 307                  | SND_SOC_DAIFMT_CBM_CFS,
 308         SND_SOC_DAILINK_REG(pcm),
 309 };
 310
 311 static struct snd_soc_card tse850_card = {
 312         .name = "TSE-850-ASoC",
 313         .owner = THIS_MODULE,
 314         .dai_link = &tse850_dailink,
 315         .num_links = 1,
 316         .dapm_widgets = tse850_dapm_widgets,
 317         .num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
 318         .dapm_routes = tse850_intercon,
 319         .num_dapm_routes = ARRAY_SIZE(tse850_intercon),
 320         .fully_routed = true,
 321 };
 322
 323 static int tse850_dt_init(struct platform_device *pdev)
 324 {
 325         struct device_node *np = pdev->dev.of_node;
 326         struct device_node *codec_np, *cpu_np;
 327         struct snd_soc_dai_link *dailink = &tse850_dailink;
 328
 329         if (!np) {
 330                 dev_err(&pdev->dev, "only device tree supported\n");
 331                 return -EINVAL;
 332         }
 333
 334         cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
 335         if (!cpu_np) {
 336                 dev_err(&pdev->dev, "failed to get cpu dai\n");
 337                 return -EINVAL;
 338         }
 339         dailink->cpus->of_node = cpu_np;
 340         dailink->platforms->of_node = cpu_np;
 341         of_node_put(cpu_np);
 342
 343         codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
 344         if (!codec_np) {
 345                 dev_err(&pdev->dev, "failed to get codec info\n");
 346                 return -EINVAL;
 347         }
 348         dailink->codecs->of_node = codec_np;
 349         of_node_put(codec_np);
 350
 351         return 0;
 352 }
 353
 354 static int tse850_probe(struct platform_device *pdev)
 355 {
 356         struct snd_soc_card *card = &tse850_card;
 357         struct device *dev = card->dev = &pdev->dev;
 358         struct tse850_priv *tse850;
 359         int ret;
 360
 361         tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
 362         if (!tse850)
 363                 return -ENOMEM;
 364
 365         snd_soc_card_set_drvdata(card, tse850);
 366
 367         ret = tse850_dt_init(pdev);
 368         if (ret) {
 369                 dev_err(dev, "failed to init dt info\n");
 370                 return ret;
 371         }
 372
 373         tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
 374         if (IS_ERR(tse850->add)) {
 375                 if (PTR_ERR(tse850->add) != -EPROBE_DEFER)
 376                         dev_err(dev, "failed to get 'add' gpio\n");
 377                 return PTR_ERR(tse850->add);
 378         }
 379         tse850->add_cache = 1;
 380
 381         tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
 382         if (IS_ERR(tse850->loop1)) {
 383                 if (PTR_ERR(tse850->loop1) != -EPROBE_DEFER)
 384                         dev_err(dev, "failed to get 'loop1' gpio\n");
 385                 return PTR_ERR(tse850->loop1);
 386         }
 387         tse850->loop1_cache = 1;
 388
 389         tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
 390         if (IS_ERR(tse850->loop2)) {
 391                 if (PTR_ERR(tse850->loop2) != -EPROBE_DEFER)
 392                         dev_err(dev, "failed to get 'loop2' gpio\n");
 393                 return PTR_ERR(tse850->loop2);
 394         }
 395         tse850->loop2_cache = 1;
 396
 397         tse850->ana = devm_regulator_get(dev, "axentia,ana");
 398         if (IS_ERR(tse850->ana)) {
 399                 if (PTR_ERR(tse850->ana) != -EPROBE_DEFER)
 400                         dev_err(dev, "failed to get 'ana' regulator\n");
 401                 return PTR_ERR(tse850->ana);
 402         }
 403
 404         ret = regulator_enable(tse850->ana);
 405         if (ret < 0) {
 406                 dev_err(dev, "failed to enable the 'ana' regulator\n");
 407                 return ret;
 408         }
 409
 410         ret = snd_soc_register_card(card);
 411         if (ret) {
 412                 dev_err(dev, "snd_soc_register_card failed\n");
 413                 goto err_disable_ana;
 414         }
 415
 416         return 0;
 417
 418 err_disable_ana:
 419         regulator_disable(tse850->ana);
 420         return ret;
 421 }
 422
 423 static int tse850_remove(struct platform_device *pdev)
 424 {
 425         struct snd_soc_card *card = platform_get_drvdata(pdev);
 426         struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 427
 428         snd_soc_unregister_card(card);
 429         regulator_disable(tse850->ana);
 430
 431         return 0;
 432 }
 433
 434 static const struct of_device_id tse850_dt_ids[] = {
 435         { .compatible = "axentia,tse850-pcm5142", },
 436         { /* sentinel */ }
 437 };
 438 MODULE_DEVICE_TABLE(of, tse850_dt_ids);
 439
 440 static struct platform_driver tse850_driver = {
 441         .driver = {
 442                 .name = "axentia-tse850-pcm5142",
 443                 .of_match_table = of_match_ptr(tse850_dt_ids),
 444         },
 445         .probe = tse850_probe,
 446         .remove = tse850_remove,
 447 };
 448
 449 module_platform_driver(tse850_driver);
 450
 451 /* Module information */
 452 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
 453 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
 454 MODULE_LICENSE("GPL v2");