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
  19 #include <sound/core.h>
  20 #include <sound/jack.h>
  21 #include <sound/soc.h>
  22
  23 #include "ts3a227e.h"
  24
  25 struct ts3a227e {
  26         struct regmap *regmap;
  27         struct snd_soc_jack *jack;
  28         bool plugged;
  29         bool mic_present;
  30         unsigned int buttons_held;
  31 };
  32
  33 /* Button values to be reported on the jack */
  34 static const int ts3a227e_buttons[] = {
  35         SND_JACK_BTN_0,
  36         SND_JACK_BTN_1,
  37         SND_JACK_BTN_2,
  38         SND_JACK_BTN_3,
  39 };
  40
  41 #define TS3A227E_NUM_BUTTONS 4
  42 #define TS3A227E_JACK_MASK (SND_JACK_HEADPHONE | \
  43                             SND_JACK_MICROPHONE | \
  44                             SND_JACK_BTN_0 | \
  45                             SND_JACK_BTN_1 | \
  46                             SND_JACK_BTN_2 | \
  47                             SND_JACK_BTN_3)
  48
  49 /* TS3A227E registers */
  50 #define TS3A227E_REG_DEVICE_ID          0x00
  51 #define TS3A227E_REG_INTERRUPT          0x01
  52 #define TS3A227E_REG_KP_INTERRUPT       0x02
  53 #define TS3A227E_REG_INTERRUPT_DISABLE  0x03
  54 #define TS3A227E_REG_SETTING_1          0x04
  55 #define TS3A227E_REG_SETTING_2          0x05
  56 #define TS3A227E_REG_SETTING_3          0x06
  57 #define TS3A227E_REG_SWITCH_CONTROL_1   0x07
  58 #define TS3A227E_REG_SWITCH_CONTROL_2   0x08
  59 #define TS3A227E_REG_SWITCH_STATUS_1    0x09
  60 #define TS3A227E_REG_SWITCH_STATUS_2    0x0a
  61 #define TS3A227E_REG_ACCESSORY_STATUS   0x0b
  62 #define TS3A227E_REG_ADC_OUTPUT         0x0c
  63 #define TS3A227E_REG_KP_THRESHOLD_1     0x0d
  64 #define TS3A227E_REG_KP_THRESHOLD_2     0x0e
  65 #define TS3A227E_REG_KP_THRESHOLD_3     0x0f
  66
  67 /* TS3A227E_REG_INTERRUPT 0x01 */
  68 #define INS_REM_EVENT 0x01
  69 #define DETECTION_COMPLETE_EVENT 0x02
  70
  71 /* TS3A227E_REG_KP_INTERRUPT 0x02 */
  72 #define PRESS_MASK(idx) (0x01 << (2 * (idx)))
  73 #define RELEASE_MASK(idx) (0x02 << (2 * (idx)))
  74
  75 /* TS3A227E_REG_INTERRUPT_DISABLE 0x03 */
  76 #define INS_REM_INT_DISABLE 0x01
  77 #define DETECTION_COMPLETE_INT_DISABLE 0x02
  78 #define ADC_COMPLETE_INT_DISABLE 0x04
  79 #define INTB_DISABLE 0x08
  80
  81 /* TS3A227E_REG_SETTING_2 0x05 */
  82 #define KP_ENABLE 0x04
  83
  84 /* TS3A227E_REG_SETTING_3 0x06 */
  85 #define MICBIAS_SETTING_SFT (3)
  86 #define MICBIAS_SETTING_MASK (0x7 << MICBIAS_SETTING_SFT)
  87
  88 /* TS3A227E_REG_ACCESSORY_STATUS  0x0b */
  89 #define TYPE_3_POLE 0x01
  90 #define TYPE_4_POLE_OMTP 0x02
  91 #define TYPE_4_POLE_STANDARD 0x04
  92 #define JACK_INSERTED 0x08
  93 #define EITHER_MIC_MASK (TYPE_4_POLE_OMTP | TYPE_4_POLE_STANDARD)
  94
  95 static const struct reg_default ts3a227e_reg_defaults[] = {
  96         { TS3A227E_REG_DEVICE_ID, 0x10 },
  97         { TS3A227E_REG_INTERRUPT, 0x00 },
  98         { TS3A227E_REG_KP_INTERRUPT, 0x00 },
  99         { TS3A227E_REG_INTERRUPT_DISABLE, 0x08 },
 100         { TS3A227E_REG_SETTING_1, 0x23 },
 101         { TS3A227E_REG_SETTING_2, 0x00 },
 102         { TS3A227E_REG_SETTING_3, 0x0e },
 103         { TS3A227E_REG_SWITCH_CONTROL_1, 0x00 },
 104         { TS3A227E_REG_SWITCH_CONTROL_2, 0x00 },
 105         { TS3A227E_REG_SWITCH_STATUS_1, 0x0c },
 106         { TS3A227E_REG_SWITCH_STATUS_2, 0x00 },
 107         { TS3A227E_REG_ACCESSORY_STATUS, 0x00 },
 108         { TS3A227E_REG_ADC_OUTPUT, 0x00 },
 109         { TS3A227E_REG_KP_THRESHOLD_1, 0x20 },
 110         { TS3A227E_REG_KP_THRESHOLD_2, 0x40 },
 111         { TS3A227E_REG_KP_THRESHOLD_3, 0x68 },
 112 };
 113
 114 static bool ts3a227e_readable_reg(struct device *dev, unsigned int reg)
 115 {
 116         switch (reg) {
 117         case TS3A227E_REG_DEVICE_ID ... TS3A227E_REG_KP_THRESHOLD_3:
 118                 return true;
 119         default:
 120                 return false;
 121         }
 122 }
 123
 124 static bool ts3a227e_writeable_reg(struct device *dev, unsigned int reg)
 125 {
 126         switch (reg) {
 127         case TS3A227E_REG_INTERRUPT_DISABLE ... TS3A227E_REG_SWITCH_CONTROL_2:
 128         case TS3A227E_REG_KP_THRESHOLD_1 ... TS3A227E_REG_KP_THRESHOLD_3:
 129                 return true;
 130         default:
 131                 return false;
 132         }
 133 }
 134
 135 static bool ts3a227e_volatile_reg(struct device *dev, unsigned int reg)
 136 {
 137         switch (reg) {
 138         case TS3A227E_REG_INTERRUPT ... TS3A227E_REG_INTERRUPT_DISABLE:
 139         case TS3A227E_REG_SETTING_2:
 140         case TS3A227E_REG_SWITCH_STATUS_1 ... TS3A227E_REG_ADC_OUTPUT:
 141                 return true;
 142         default:
 143                 return false;
 144         }
 145 }
 146
 147 static void ts3a227e_jack_report(struct ts3a227e *ts3a227e)
 148 {
 149         unsigned int i;
 150         int report = 0;
 151
 152         if (!ts3a227e->jack)
 153                 return;
 154
 155         if (ts3a227e->plugged)
 156                 report = SND_JACK_HEADPHONE;
 157         if (ts3a227e->mic_present)
 158                 report |= SND_JACK_MICROPHONE;
 159         for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
 160                 if (ts3a227e->buttons_held & (1 << i))
 161                         report |= ts3a227e_buttons[i];
 162         }
 163         snd_soc_jack_report(ts3a227e->jack, report, TS3A227E_JACK_MASK);
 164 }
 165
 166 static void ts3a227e_new_jack_state(struct ts3a227e *ts3a227e, unsigned acc_reg)
 167 {
 168         bool plugged, mic_present;
 169
 170         plugged = !!(acc_reg & JACK_INSERTED);
 171         mic_present = plugged && !!(acc_reg & EITHER_MIC_MASK);
 172
 173         ts3a227e->plugged = plugged;
 174
 175         if (mic_present != ts3a227e->mic_present) {
 176                 ts3a227e->mic_present = mic_present;
 177                 ts3a227e->buttons_held = 0;
 178                 if (mic_present) {
 179                         /* Enable key press detection. */
 180                         regmap_update_bits(ts3a227e->regmap,
 181                                            TS3A227E_REG_SETTING_2,
 182                                            KP_ENABLE, KP_ENABLE);
 183                 }
 184         }
 185 }
 186
 187 static irqreturn_t ts3a227e_interrupt(int irq, void *data)
 188 {
 189         struct ts3a227e *ts3a227e = (struct ts3a227e *)data;
 190         struct regmap *regmap = ts3a227e->regmap;
 191         unsigned int int_reg, kp_int_reg, acc_reg, i;
 192
 193         /* Check for plug/unplug. */
 194         regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg);
 195         if (int_reg & (DETECTION_COMPLETE_EVENT | INS_REM_EVENT)) {
 196                 regmap_read(regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
 197                 ts3a227e_new_jack_state(ts3a227e, acc_reg);
 198         }
 199
 200         /* Report any key events. */
 201         regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg);
 202         for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
 203                 if (kp_int_reg & PRESS_MASK(i))
 204                         ts3a227e->buttons_held |= (1 << i);
 205                 if (kp_int_reg & RELEASE_MASK(i))
 206                         ts3a227e->buttons_held &= ~(1 << i);
 207         }
 208
 209         ts3a227e_jack_report(ts3a227e);
 210
 211         return IRQ_HANDLED;
 212 }
 213
 214 /**
 215  * ts3a227e_enable_jack_detect - Specify a jack for event reporting
 216  *
 217  * @component:  component to register the jack with
 218  * @jack: jack to use to report headset and button events on
 219  *
 220  * After this function has been called the headset insert/remove and button
 221  * events 0-3 will be routed to the given jack.  Jack can be null to stop
 222  * reporting.
 223  */
 224 int ts3a227e_enable_jack_detect(struct snd_soc_component *component,
 225                                 struct snd_soc_jack *jack)
 226 {
 227         struct ts3a227e *ts3a227e = snd_soc_component_get_drvdata(component);
 228
 229         snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_MEDIA);
 230         snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
 231         snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
 232         snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
 233
 234         ts3a227e->jack = jack;
 235         ts3a227e_jack_report(ts3a227e);
 236
 237         return 0;
 238 }
 239 EXPORT_SYMBOL_GPL(ts3a227e_enable_jack_detect);
 240
 241 static struct snd_soc_component_driver ts3a227e_soc_driver;
 242
 243 static const struct regmap_config ts3a227e_regmap_config = {
 244         .val_bits = 8,
 245         .reg_bits = 8,
 246
 247         .max_register = TS3A227E_REG_KP_THRESHOLD_3,
 248         .readable_reg = ts3a227e_readable_reg,
 249         .writeable_reg = ts3a227e_writeable_reg,
 250         .volatile_reg = ts3a227e_volatile_reg,
 251
 252         .cache_type = REGCACHE_RBTREE,
 253         .reg_defaults = ts3a227e_reg_defaults,
 254         .num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults),
 255 };
 256
 257 static int ts3a227e_parse_dt(struct ts3a227e *ts3a227e, struct device_node *np)
 258 {
 259         u32 micbias;
 260         int err;
 261
 262         err = of_property_read_u32(np, "ti,micbias", &micbias);
 263         if (!err) {
 264                 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_3,
 265                         MICBIAS_SETTING_MASK,
 266                         (micbias & 0x07) << MICBIAS_SETTING_SFT);
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int ts3a227e_i2c_probe(struct i2c_client *i2c,
 273                               const struct i2c_device_id *id)
 274 {
 275         struct ts3a227e *ts3a227e;
 276         struct device *dev = &i2c->dev;
 277         int ret;
 278         unsigned int acc_reg;
 279
 280         ts3a227e = devm_kzalloc(&i2c->dev, sizeof(*ts3a227e), GFP_KERNEL);
 281         if (ts3a227e == NULL)
 282                 return -ENOMEM;
 283
 284         i2c_set_clientdata(i2c, ts3a227e);
 285
 286         ts3a227e->regmap = devm_regmap_init_i2c(i2c, &ts3a227e_regmap_config);
 287         if (IS_ERR(ts3a227e->regmap))
 288                 return PTR_ERR(ts3a227e->regmap);
 289
 290         if (dev->of_node) {
 291                 ret = ts3a227e_parse_dt(ts3a227e, dev->of_node);
 292                 if (ret) {
 293                         dev_err(dev, "Failed to parse device tree: %d\n", ret);
 294                         return ret;
 295                 }
 296         }
 297
 298         ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt,
 299                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 300                                         "TS3A227E", ts3a227e);
 301         if (ret) {
 302                 dev_err(dev, "Cannot request irq %d (%d)\n", i2c->irq, ret);
 303                 return ret;
 304         }
 305
 306         ret = devm_snd_soc_register_component(&i2c->dev, &ts3a227e_soc_driver,
 307                                               NULL, 0);
 308         if (ret)
 309                 return ret;
 310
 311         /* Enable interrupts except for ADC complete. */
 312         regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_INTERRUPT_DISABLE,
 313                            INTB_DISABLE | ADC_COMPLETE_INT_DISABLE,
 314                            ADC_COMPLETE_INT_DISABLE);
 315
 316         /* Read jack status because chip might not trigger interrupt at boot. */
 317         regmap_read(ts3a227e->regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
 318         ts3a227e_new_jack_state(ts3a227e, acc_reg);
 319         ts3a227e_jack_report(ts3a227e);
 320
 321         return 0;
 322 }
 323
 324 static const struct i2c_device_id ts3a227e_i2c_ids[] = {
 325         { "ts3a227e", 0 },
 326         { }
 327 };
 328 MODULE_DEVICE_TABLE(i2c, ts3a227e_i2c_ids);
 329
 330 static const struct of_device_id ts3a227e_of_match[] = {
 331         { .compatible = "ti,ts3a227e", },
 332         { }
 333 };
 334 MODULE_DEVICE_TABLE(of, ts3a227e_of_match);
 335
 336 static struct i2c_driver ts3a227e_driver = {
 337         .driver = {
 338                 .name = "ts3a227e",
 339                 .owner = THIS_MODULE,
 340                 .of_match_table = of_match_ptr(ts3a227e_of_match),
 341         },
 342         .probe = ts3a227e_i2c_probe,
 343         .id_table = ts3a227e_i2c_ids,
 344 };
 345 module_i2c_driver(ts3a227e_driver);
 346
 347 MODULE_DESCRIPTION("ASoC ts3a227e driver");
 348 MODULE_AUTHOR("Dylan Reid <dgreid@chromium.org>");
 349 MODULE_LICENSE("GPL v2");