sound/soc/codecs/ts3a227e.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TS3A227E Autonomous Audio Accessory Detection and Configuration Switch
   4  *
   5  * Copyright (C) 2014 Google, Inc.
   6  */
   7
   8 #include <linux/gpio.h>
   9 #include <linux/i2c.h>
  10 #include <linux/init.h>
  11 #include <linux/input.h>
  12 #include <linux/module.h>
  13 #include <linux/regmap.h>
  14 #include <linux/acpi.h>
  15
  16 #include <sound/core.h>
  17 #include <sound/jack.h>
  18 #include <sound/soc.h>
  19
  20 #include "ts3a227e.h"
  21
  22 struct ts3a227e {
  23         struct device *dev;
  24         struct regmap *regmap;
  25         struct snd_soc_jack *jack;
  26         bool plugged;
  27         bool mic_present;
  28         unsigned int buttons_held;
  29         int irq;
  30 };
  31
  32 /* Button values to be reported on the jack */
  33 static const int ts3a227e_buttons[] = {
  34         SND_JACK_BTN_0,
  35         SND_JACK_BTN_1,
  36         SND_JACK_BTN_2,
  37         SND_JACK_BTN_3,
  38 };
  39
  40 #define TS3A227E_NUM_BUTTONS 4
  41 #define TS3A227E_JACK_MASK (SND_JACK_HEADPHONE | \
  42                             SND_JACK_MICROPHONE | \
  43                             SND_JACK_BTN_0 | \
  44                             SND_JACK_BTN_1 | \
  45                             SND_JACK_BTN_2 | \
  46                             SND_JACK_BTN_3)
  47
  48 /* TS3A227E registers */
  49 #define TS3A227E_REG_DEVICE_ID          0x00
  50 #define TS3A227E_REG_INTERRUPT          0x01
  51 #define TS3A227E_REG_KP_INTERRUPT       0x02
  52 #define TS3A227E_REG_INTERRUPT_DISABLE  0x03
  53 #define TS3A227E_REG_SETTING_1          0x04
  54 #define TS3A227E_REG_SETTING_2          0x05
  55 #define TS3A227E_REG_SETTING_3          0x06
  56 #define TS3A227E_REG_SWITCH_CONTROL_1   0x07
  57 #define TS3A227E_REG_SWITCH_CONTROL_2   0x08
  58 #define TS3A227E_REG_SWITCH_STATUS_1    0x09
  59 #define TS3A227E_REG_SWITCH_STATUS_2    0x0a
  60 #define TS3A227E_REG_ACCESSORY_STATUS   0x0b
  61 #define TS3A227E_REG_ADC_OUTPUT         0x0c
  62 #define TS3A227E_REG_KP_THRESHOLD_1     0x0d
  63 #define TS3A227E_REG_KP_THRESHOLD_2     0x0e
  64 #define TS3A227E_REG_KP_THRESHOLD_3     0x0f
  65
  66 /* TS3A227E_REG_INTERRUPT 0x01 */
  67 #define INS_REM_EVENT 0x01
  68 #define DETECTION_COMPLETE_EVENT 0x02
  69
  70 /* TS3A227E_REG_KP_INTERRUPT 0x02 */
  71 #define PRESS_MASK(idx) (0x01 << (2 * (idx)))
  72 #define RELEASE_MASK(idx) (0x02 << (2 * (idx)))
  73
  74 /* TS3A227E_REG_INTERRUPT_DISABLE 0x03 */
  75 #define INS_REM_INT_DISABLE 0x01
  76 #define DETECTION_COMPLETE_INT_DISABLE 0x02
  77 #define ADC_COMPLETE_INT_DISABLE 0x04
  78 #define INTB_DISABLE 0x08
  79
  80 /* TS3A227E_REG_SETTING_1 0x4 */
  81 #define DEBOUNCE_INSERTION_SETTING_SFT (0)
  82 #define DEBOUNCE_INSERTION_SETTING_MASK (0x7 << DEBOUNCE_PRESS_SETTING_SFT)
  83
  84 /* TS3A227E_REG_SETTING_2 0x05 */
  85 #define KP_ENABLE 0x04
  86
  87 /* TS3A227E_REG_SETTING_3 0x06 */
  88 #define MICBIAS_SETTING_SFT 3
  89 #define MICBIAS_SETTING_MASK (0x7 << MICBIAS_SETTING_SFT)
  90 #define DEBOUNCE_RELEASE_SETTING_SFT 2
  91 #define DEBOUNCE_RELEASE_SETTING_MASK (0x1 << DEBOUNCE_RELEASE_SETTING_SFT)
  92 #define DEBOUNCE_PRESS_SETTING_SFT 0
  93 #define DEBOUNCE_PRESS_SETTING_MASK (0x3 << DEBOUNCE_PRESS_SETTING_SFT)
  94
  95 /* TS3A227E_REG_ACCESSORY_STATUS  0x0b */
  96 #define TYPE_3_POLE 0x01
  97 #define TYPE_4_POLE_OMTP 0x02
  98 #define TYPE_4_POLE_STANDARD 0x04
  99 #define JACK_INSERTED 0x08
 100 #define EITHER_MIC_MASK (TYPE_4_POLE_OMTP | TYPE_4_POLE_STANDARD)
 101
 102 static const struct reg_default ts3a227e_reg_defaults[] = {
 103         { TS3A227E_REG_DEVICE_ID, 0x10 },
 104         { TS3A227E_REG_INTERRUPT, 0x00 },
 105         { TS3A227E_REG_KP_INTERRUPT, 0x00 },
 106         { TS3A227E_REG_INTERRUPT_DISABLE, 0x08 },
 107         { TS3A227E_REG_SETTING_1, 0x23 },
 108         { TS3A227E_REG_SETTING_2, 0x00 },
 109         { TS3A227E_REG_SETTING_3, 0x0e },
 110         { TS3A227E_REG_SWITCH_CONTROL_1, 0x00 },
 111         { TS3A227E_REG_SWITCH_CONTROL_2, 0x00 },
 112         { TS3A227E_REG_SWITCH_STATUS_1, 0x0c },
 113         { TS3A227E_REG_SWITCH_STATUS_2, 0x00 },
 114         { TS3A227E_REG_ACCESSORY_STATUS, 0x00 },
 115         { TS3A227E_REG_ADC_OUTPUT, 0x00 },
 116         { TS3A227E_REG_KP_THRESHOLD_1, 0x20 },
 117         { TS3A227E_REG_KP_THRESHOLD_2, 0x40 },
 118         { TS3A227E_REG_KP_THRESHOLD_3, 0x68 },
 119 };
 120
 121 static bool ts3a227e_readable_reg(struct device *dev, unsigned int reg)
 122 {
 123         switch (reg) {
 124         case TS3A227E_REG_DEVICE_ID ... TS3A227E_REG_KP_THRESHOLD_3:
 125                 return true;
 126         default:
 127                 return false;
 128         }
 129 }
 130
 131 static bool ts3a227e_writeable_reg(struct device *dev, unsigned int reg)
 132 {
 133         switch (reg) {
 134         case TS3A227E_REG_INTERRUPT_DISABLE ... TS3A227E_REG_SWITCH_CONTROL_2:
 135         case TS3A227E_REG_KP_THRESHOLD_1 ... TS3A227E_REG_KP_THRESHOLD_3:
 136                 return true;
 137         default:
 138                 return false;
 139         }
 140 }
 141
 142 static bool ts3a227e_volatile_reg(struct device *dev, unsigned int reg)
 143 {
 144         switch (reg) {
 145         case TS3A227E_REG_INTERRUPT ... TS3A227E_REG_INTERRUPT_DISABLE:
 146         case TS3A227E_REG_SETTING_1 ... TS3A227E_REG_SETTING_2:
 147         case TS3A227E_REG_SWITCH_STATUS_1 ... TS3A227E_REG_ADC_OUTPUT:
 148                 return true;
 149         default:
 150                 return false;
 151         }
 152 }
 153
 154 static void ts3a227e_jack_report(struct ts3a227e *ts3a227e)
 155 {
 156         unsigned int i;
 157         int report = 0;
 158
 159         if (!ts3a227e->jack)
 160                 return;
 161
 162         if (ts3a227e->plugged)
 163                 report = SND_JACK_HEADPHONE;
 164         if (ts3a227e->mic_present)
 165                 report |= SND_JACK_MICROPHONE;
 166         for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
 167                 if (ts3a227e->buttons_held & (1 << i))
 168                         report |= ts3a227e_buttons[i];
 169         }
 170         snd_soc_jack_report(ts3a227e->jack, report, TS3A227E_JACK_MASK);
 171 }
 172
 173 static void ts3a227e_new_jack_state(struct ts3a227e *ts3a227e, unsigned acc_reg)
 174 {
 175         bool plugged, mic_present;
 176
 177         plugged = !!(acc_reg & JACK_INSERTED);
 178         mic_present = plugged && !!(acc_reg & EITHER_MIC_MASK);
 179
 180         ts3a227e->plugged = plugged;
 181
 182         if (mic_present != ts3a227e->mic_present) {
 183                 ts3a227e->mic_present = mic_present;
 184                 ts3a227e->buttons_held = 0;
 185                 if (mic_present) {
 186                         /* Enable key press detection. */
 187                         regmap_update_bits(ts3a227e->regmap,
 188                                            TS3A227E_REG_SETTING_2,
 189                                            KP_ENABLE, KP_ENABLE);
 190                 }
 191         }
 192 }
 193
 194 static irqreturn_t ts3a227e_interrupt(int irq, void *data)
 195 {
 196         struct ts3a227e *ts3a227e = (struct ts3a227e *)data;
 197         struct regmap *regmap = ts3a227e->regmap;
 198         unsigned int int_reg, kp_int_reg, acc_reg, i;
 199         struct device *dev = ts3a227e->dev;
 200         int ret;
 201
 202         /* Check for plug/unplug. */
 203         ret = regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg);
 204         if (ret) {
 205                 dev_err(dev, "failed to clear interrupt ret=%d\n", ret);
 206                 return IRQ_NONE;
 207         }
 208
 209         if (int_reg & (DETECTION_COMPLETE_EVENT | INS_REM_EVENT)) {
 210                 regmap_read(regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
 211                 ts3a227e_new_jack_state(ts3a227e, acc_reg);
 212         }
 213
 214         /* Report any key events. */
 215         ret = regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg);
 216         if (ret) {
 217                 dev_err(dev, "failed to clear key interrupt ret=%d\n", ret);
 218                 return IRQ_NONE;
 219         }
 220
 221         for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
 222                 if (kp_int_reg & PRESS_MASK(i))
 223                         ts3a227e->buttons_held |= (1 << i);
 224                 if (kp_int_reg & RELEASE_MASK(i))
 225                         ts3a227e->buttons_held &= ~(1 << i);
 226         }
 227
 228         ts3a227e_jack_report(ts3a227e);
 229
 230         return IRQ_HANDLED;
 231 }
 232
 233 /**
 234  * ts3a227e_enable_jack_detect - Specify a jack for event reporting
 235  *
 236  * @component:  component to register the jack with
 237  * @jack: jack to use to report headset and button events on
 238  *
 239  * After this function has been called the headset insert/remove and button
 240  * events 0-3 will be routed to the given jack.  Jack can be null to stop
 241  * reporting.
 242  */
 243 int ts3a227e_enable_jack_detect(struct snd_soc_component *component,
 244                                 struct snd_soc_jack *jack)
 245 {
 246         struct ts3a227e *ts3a227e = snd_soc_component_get_drvdata(component);
 247
 248         snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
 249         snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
 250         snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
 251         snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
 252
 253         ts3a227e->jack = jack;
 254         ts3a227e_jack_report(ts3a227e);
 255
 256         return 0;
 257 }
 258 EXPORT_SYMBOL_GPL(ts3a227e_enable_jack_detect);
 259
 260 static int ts3a227e_set_jack(struct snd_soc_component *component,
 261                              struct snd_soc_jack *jack, void *data)
 262 {
 263         if (jack == NULL)
 264                 return -EINVAL;
 265
 266         return ts3a227e_enable_jack_detect(component, jack);
 267 }
 268
 269 static int ts3a227e_get_jack_type(struct snd_soc_component *component)
 270 {
 271         return SND_JACK_HEADSET;
 272 }
 273
 274 static const struct snd_soc_component_driver ts3a227e_soc_driver = {
 275         .name = "ti,ts3a227e",
 276         .set_jack = ts3a227e_set_jack,
 277         .get_jack_type = ts3a227e_get_jack_type,
 278 };
 279
 280 static const struct regmap_config ts3a227e_regmap_config = {
 281         .val_bits = 8,
 282         .reg_bits = 8,
 283
 284         .max_register = TS3A227E_REG_KP_THRESHOLD_3,
 285         .readable_reg = ts3a227e_readable_reg,
 286         .writeable_reg = ts3a227e_writeable_reg,
 287         .volatile_reg = ts3a227e_volatile_reg,
 288
 289         .cache_type = REGCACHE_RBTREE,
 290         .reg_defaults = ts3a227e_reg_defaults,
 291         .num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults),
 292 };
 293
 294 static int ts3a227e_parse_device_property(struct ts3a227e *ts3a227e,
 295                                 struct device *dev)
 296 {
 297         u32 value;
 298         u32 value_ms;
 299         u32 setting3_value = 0;
 300         u32 setting3_mask = 0;
 301         int err;
 302
 303         err = device_property_read_u32(dev, "ti,micbias", &value);
 304         if (!err) {
 305                 setting3_mask = MICBIAS_SETTING_MASK;
 306                 setting3_value = (value << MICBIAS_SETTING_SFT) &
 307                                  MICBIAS_SETTING_MASK;
 308         }
 309
 310         err = device_property_read_u32(dev, "ti,debounce-release-ms",
 311                                        &value_ms);
 312         if (!err) {
 313                 value = (value_ms > 10);
 314                 setting3_mask |= DEBOUNCE_RELEASE_SETTING_MASK;
 315                 setting3_value |= (value << DEBOUNCE_RELEASE_SETTING_SFT) &
 316                                   DEBOUNCE_RELEASE_SETTING_MASK;
 317         }
 318
 319         err = device_property_read_u32(dev, "ti,debounce-press-ms", &value_ms);
 320         if (!err) {
 321                 value = (value_ms + 20) / 40;
 322                 if (value > 3)
 323                         value = 3;
 324                 setting3_mask |= DEBOUNCE_PRESS_SETTING_MASK;
 325                 setting3_value |= (value << DEBOUNCE_PRESS_SETTING_SFT) &
 326                                   DEBOUNCE_PRESS_SETTING_MASK;
 327         }
 328
 329         if (setting3_mask)
 330                 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_3,
 331                                    setting3_mask, setting3_value);
 332
 333         err = device_property_read_u32(dev, "ti,debounce-insertion-ms",
 334                                        &value_ms);
 335         if (!err) {
 336                 if (value_ms < 165)
 337                         value = (value_ms + 15) / 30;
 338                 else if (value_ms < 1500)
 339                         value = 6;
 340                 else
 341                         value = 7;
 342                 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_1,
 343                                    DEBOUNCE_INSERTION_SETTING_MASK,
 344                                    (value << DEBOUNCE_INSERTION_SETTING_SFT) &
 345                                            DEBOUNCE_INSERTION_SETTING_MASK);
 346         }
 347
 348         return 0;
 349 }
 350
 351 static int ts3a227e_i2c_probe(struct i2c_client *i2c)
 352 {
 353         struct ts3a227e *ts3a227e;
 354         struct device *dev = &i2c->dev;
 355         int ret;
 356         unsigned int acc_reg;
 357
 358         ts3a227e = devm_kzalloc(&i2c->dev, sizeof(*ts3a227e), GFP_KERNEL);
 359         if (ts3a227e == NULL)
 360                 return -ENOMEM;
 361
 362         i2c_set_clientdata(i2c, ts3a227e);
 363         ts3a227e->dev = dev;
 364         ts3a227e->irq = i2c->irq;
 365
 366         ts3a227e->regmap = devm_regmap_init_i2c(i2c, &ts3a227e_regmap_config);
 367         if (IS_ERR(ts3a227e->regmap))
 368                 return PTR_ERR(ts3a227e->regmap);
 369
 370         ret = ts3a227e_parse_device_property(ts3a227e, dev);
 371         if (ret) {
 372                 dev_err(dev, "Failed to parse device property: %d\n", ret);
 373                 return ret;
 374         }
 375
 376         ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt,
 377                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 378                                         "TS3A227E", ts3a227e);
 379         if (ret) {
 380                 dev_err(dev, "Cannot request irq %d (%d)\n", i2c->irq, ret);
 381                 return ret;
 382         }
 383
 384         ret = devm_snd_soc_register_component(&i2c->dev, &ts3a227e_soc_driver,
 385                                               NULL, 0);
 386         if (ret)
 387                 return ret;
 388
 389         /* Enable interrupts except for ADC complete. */
 390         regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_INTERRUPT_DISABLE,
 391                            INTB_DISABLE | ADC_COMPLETE_INT_DISABLE,
 392                            ADC_COMPLETE_INT_DISABLE);
 393
 394         /* Read jack status because chip might not trigger interrupt at boot. */
 395         regmap_read(ts3a227e->regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
 396         ts3a227e_new_jack_state(ts3a227e, acc_reg);
 397         ts3a227e_jack_report(ts3a227e);
 398
 399         return 0;
 400 }
 401
 402 #ifdef CONFIG_PM_SLEEP
 403 static int ts3a227e_suspend(struct device *dev)
 404 {
 405         struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
 406
 407         dev_dbg(ts3a227e->dev, "suspend disable irq\n");
 408         disable_irq(ts3a227e->irq);
 409
 410         return 0;
 411 }
 412
 413 static int ts3a227e_resume(struct device *dev)
 414 {
 415         struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
 416
 417         dev_dbg(ts3a227e->dev, "resume enable irq\n");
 418         enable_irq(ts3a227e->irq);
 419
 420         return 0;
 421 }
 422 #endif
 423
 424 static const struct dev_pm_ops ts3a227e_pm = {
 425         SET_SYSTEM_SLEEP_PM_OPS(ts3a227e_suspend, ts3a227e_resume)
 426 };
 427
 428 static const struct i2c_device_id ts3a227e_i2c_ids[] = {
 429         { "ts3a227e" },
 430         { }
 431 };
 432 MODULE_DEVICE_TABLE(i2c, ts3a227e_i2c_ids);
 433
 434 #ifdef CONFIG_OF
 435 static const struct of_device_id ts3a227e_of_match[] = {
 436         { .compatible = "ti,ts3a227e", },
 437         { }
 438 };
 439 MODULE_DEVICE_TABLE(of, ts3a227e_of_match);
 440 #endif
 441
 442 #ifdef CONFIG_ACPI
 443 static struct acpi_device_id ts3a227e_acpi_match[] = {
 444         { "104C227E", 0 },
 445         {},
 446 };
 447 MODULE_DEVICE_TABLE(acpi, ts3a227e_acpi_match);
 448 #endif
 449
 450 static struct i2c_driver ts3a227e_driver = {
 451         .driver = {
 452                 .name = "ts3a227e",
 453                 .pm = &ts3a227e_pm,
 454                 .of_match_table = of_match_ptr(ts3a227e_of_match),
 455                 .acpi_match_table = ACPI_PTR(ts3a227e_acpi_match),
 456         },
 457         .probe = ts3a227e_i2c_probe,
 458         .id_table = ts3a227e_i2c_ids,
 459 };
 460 module_i2c_driver(ts3a227e_driver);
 461
 462 MODULE_DESCRIPTION("ASoC ts3a227e driver");
 463 MODULE_AUTHOR("Dylan Reid <dgreid@chromium.org>");
 464 MODULE_LICENSE("GPL v2");