sound/soc/codecs/ts3a227e.c

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