sound/soc/soc-jack.c

   1 /*
   2  * soc-jack.c  --  ALSA SoC jack handling
   3  *
   4  * Copyright 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <sound/jack.h>
  15 #include <sound/soc.h>
  16 #include <linux/gpio.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/delay.h>
  21 #include <linux/export.h>
  22 #include <linux/suspend.h>
  23 #include <trace/events/asoc.h>
  24
  25 /**
  26  * snd_soc_codec_set_jack - configure codec jack.
  27  * @codec: CODEC
  28  * @jack: structure to use for the jack
  29  * @data: can be used if codec driver need extra data for configuring jack
  30  *
  31  * Configures and enables jack detection function.
  32  */
  33 int snd_soc_codec_set_jack(struct snd_soc_codec *codec,
  34         struct snd_soc_jack *jack, void *data)
  35 {
  36         if (codec->driver->set_jack)
  37                 return codec->driver->set_jack(codec, jack, data);
  38         else
  39                 return -EINVAL;
  40 }
  41 EXPORT_SYMBOL_GPL(snd_soc_codec_set_jack);
  42
  43 /**
  44  * snd_soc_card_jack_new - Create a new jack
  45  * @card:  ASoC card
  46  * @id:    an identifying string for this jack
  47  * @type:  a bitmask of enum snd_jack_type values that can be detected by
  48  *         this jack
  49  * @jack:  structure to use for the jack
  50  * @pins:  Array of jack pins to be added to the jack or NULL
  51  * @num_pins: Number of elements in the @pins array
  52  *
  53  * Creates a new jack object.
  54  *
  55  * Returns zero if successful, or a negative error code on failure.
  56  * On success jack will be initialised.
  57  */
  58 int snd_soc_card_jack_new(struct snd_soc_card *card, const char *id, int type,
  59         struct snd_soc_jack *jack, struct snd_soc_jack_pin *pins,
  60         unsigned int num_pins)
  61 {
  62         int ret;
  63
  64         mutex_init(&jack->mutex);
  65         jack->card = card;
  66         INIT_LIST_HEAD(&jack->pins);
  67         INIT_LIST_HEAD(&jack->jack_zones);
  68         BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
  69
  70         ret = snd_jack_new(card->snd_card, id, type, &jack->jack, false, false);
  71         if (ret)
  72                 return ret;
  73
  74         if (num_pins)
  75                 return snd_soc_jack_add_pins(jack, num_pins, pins);
  76
  77         return 0;
  78 }
  79 EXPORT_SYMBOL_GPL(snd_soc_card_jack_new);
  80
  81 /**
  82  * snd_soc_jack_report - Report the current status for a jack
  83  *
  84  * @jack:   the jack
  85  * @status: a bitmask of enum snd_jack_type values that are currently detected.
  86  * @mask:   a bitmask of enum snd_jack_type values that being reported.
  87  *
  88  * If configured using snd_soc_jack_add_pins() then the associated
  89  * DAPM pins will be enabled or disabled as appropriate and DAPM
  90  * synchronised.
  91  *
  92  * Note: This function uses mutexes and should be called from a
  93  * context which can sleep (such as a workqueue).
  94  */
  95 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
  96 {
  97         struct snd_soc_dapm_context *dapm;
  98         struct snd_soc_jack_pin *pin;
  99         unsigned int sync = 0;
 100         int enable;
 101
 102         trace_snd_soc_jack_report(jack, mask, status);
 103
 104         if (!jack)
 105                 return;
 106
 107         dapm = &jack->card->dapm;
 108
 109         mutex_lock(&jack->mutex);
 110
 111         jack->status &= ~mask;
 112         jack->status |= status & mask;
 113
 114         trace_snd_soc_jack_notify(jack, status);
 115
 116         list_for_each_entry(pin, &jack->pins, list) {
 117                 enable = pin->mask & jack->status;
 118
 119                 if (pin->invert)
 120                         enable = !enable;
 121
 122                 if (enable)
 123                         snd_soc_dapm_enable_pin(dapm, pin->pin);
 124                 else
 125                         snd_soc_dapm_disable_pin(dapm, pin->pin);
 126
 127                 /* we need to sync for this case only */
 128                 sync = 1;
 129         }
 130
 131         /* Report before the DAPM sync to help users updating micbias status */
 132         blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
 133
 134         if (sync)
 135                 snd_soc_dapm_sync(dapm);
 136
 137         snd_jack_report(jack->jack, jack->status);
 138
 139         mutex_unlock(&jack->mutex);
 140 }
 141 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
 142
 143 /**
 144  * snd_soc_jack_add_zones - Associate voltage zones with jack
 145  *
 146  * @jack:  ASoC jack
 147  * @count: Number of zones
 148  * @zones:  Array of zones
 149  *
 150  * After this function has been called the zones specified in the
 151  * array will be associated with the jack.
 152  */
 153 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
 154                           struct snd_soc_jack_zone *zones)
 155 {
 156         int i;
 157
 158         for (i = 0; i < count; i++) {
 159                 INIT_LIST_HEAD(&zones[i].list);
 160                 list_add(&(zones[i].list), &jack->jack_zones);
 161         }
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
 165
 166 /**
 167  * snd_soc_jack_get_type - Based on the mic bias value, this function returns
 168  * the type of jack from the zones declared in the jack type
 169  *
 170  * @jack:  ASoC jack
 171  * @micbias_voltage:  mic bias voltage at adc channel when jack is plugged in
 172  *
 173  * Based on the mic bias value passed, this function helps identify
 174  * the type of jack from the already declared jack zones
 175  */
 176 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
 177 {
 178         struct snd_soc_jack_zone *zone;
 179
 180         list_for_each_entry(zone, &jack->jack_zones, list) {
 181                 if (micbias_voltage >= zone->min_mv &&
 182                         micbias_voltage < zone->max_mv)
 183                                 return zone->jack_type;
 184         }
 185         return 0;
 186 }
 187 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
 188
 189 /**
 190  * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
 191  *
 192  * @jack:  ASoC jack
 193  * @count: Number of pins
 194  * @pins:  Array of pins
 195  *
 196  * After this function has been called the DAPM pins specified in the
 197  * pins array will have their status updated to reflect the current
 198  * state of the jack whenever the jack status is updated.
 199  */
 200 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
 201                           struct snd_soc_jack_pin *pins)
 202 {
 203         int i;
 204
 205         for (i = 0; i < count; i++) {
 206                 if (!pins[i].pin) {
 207                         dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
 208                                 i);
 209                         return -EINVAL;
 210                 }
 211                 if (!pins[i].mask) {
 212                         dev_err(jack->card->dev, "ASoC: No mask for pin %d"
 213                                 " (%s)\n", i, pins[i].pin);
 214                         return -EINVAL;
 215                 }
 216
 217                 INIT_LIST_HEAD(&pins[i].list);
 218                 list_add(&(pins[i].list), &jack->pins);
 219                 snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
 220         }
 221
 222         /* Update to reflect the last reported status; canned jack
 223          * implementations are likely to set their state before the
 224          * card has an opportunity to associate pins.
 225          */
 226         snd_soc_jack_report(jack, 0, 0);
 227
 228         return 0;
 229 }
 230 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
 231
 232 /**
 233  * snd_soc_jack_notifier_register - Register a notifier for jack status
 234  *
 235  * @jack:  ASoC jack
 236  * @nb:    Notifier block to register
 237  *
 238  * Register for notification of the current status of the jack.  Note
 239  * that it is not possible to report additional jack events in the
 240  * callback from the notifier, this is intended to support
 241  * applications such as enabling electrical detection only when a
 242  * mechanical detection event has occurred.
 243  */
 244 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
 245                                     struct notifier_block *nb)
 246 {
 247         blocking_notifier_chain_register(&jack->notifier, nb);
 248 }
 249 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
 250
 251 /**
 252  * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
 253  *
 254  * @jack:  ASoC jack
 255  * @nb:    Notifier block to unregister
 256  *
 257  * Stop notifying for status changes.
 258  */
 259 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
 260                                       struct notifier_block *nb)
 261 {
 262         blocking_notifier_chain_unregister(&jack->notifier, nb);
 263 }
 264 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
 265
 266 #ifdef CONFIG_GPIOLIB
 267 /* gpio detect */
 268 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
 269 {
 270         struct snd_soc_jack *jack = gpio->jack;
 271         int enable;
 272         int report;
 273
 274         enable = gpiod_get_value_cansleep(gpio->desc);
 275         if (gpio->invert)
 276                 enable = !enable;
 277
 278         if (enable)
 279                 report = gpio->report;
 280         else
 281                 report = 0;
 282
 283         if (gpio->jack_status_check)
 284                 report = gpio->jack_status_check(gpio->data);
 285
 286         snd_soc_jack_report(jack, report, gpio->report);
 287 }
 288
 289 /* irq handler for gpio pin */
 290 static irqreturn_t gpio_handler(int irq, void *data)
 291 {
 292         struct snd_soc_jack_gpio *gpio = data;
 293         struct device *dev = gpio->jack->card->dev;
 294
 295         trace_snd_soc_jack_irq(gpio->name);
 296
 297         if (device_may_wakeup(dev))
 298                 pm_wakeup_event(dev, gpio->debounce_time + 50);
 299
 300         queue_delayed_work(system_power_efficient_wq, &gpio->work,
 301                               msecs_to_jiffies(gpio->debounce_time));
 302
 303         return IRQ_HANDLED;
 304 }
 305
 306 /* gpio work */
 307 static void gpio_work(struct work_struct *work)
 308 {
 309         struct snd_soc_jack_gpio *gpio;
 310
 311         gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
 312         snd_soc_jack_gpio_detect(gpio);
 313 }
 314
 315 static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
 316                                     unsigned long action, void *data)
 317 {
 318         struct snd_soc_jack_gpio *gpio =
 319                         container_of(nb, struct snd_soc_jack_gpio, pm_notifier);
 320
 321         switch (action) {
 322         case PM_POST_SUSPEND:
 323         case PM_POST_HIBERNATION:
 324         case PM_POST_RESTORE:
 325                 /*
 326                  * Use workqueue so we do not have to care about running
 327                  * concurrently with work triggered by the interrupt handler.
 328                  */
 329                 queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
 330                 break;
 331         }
 332
 333         return NOTIFY_DONE;
 334 }
 335
 336 /**
 337  * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
 338  *
 339  * @jack:  ASoC jack
 340  * @count: number of pins
 341  * @gpios: array of gpio pins
 342  *
 343  * This function will request gpio, set data direction and request irq
 344  * for each gpio in the array.
 345  */
 346 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 347                         struct snd_soc_jack_gpio *gpios)
 348 {
 349         int i, ret;
 350
 351         for (i = 0; i < count; i++) {
 352                 if (!gpios[i].name) {
 353                         dev_err(jack->card->dev,
 354                                 "ASoC: No name for gpio at index %d\n", i);
 355                         ret = -EINVAL;
 356                         goto undo;
 357                 }
 358
 359                 if (gpios[i].desc) {
 360                         /* Already have a GPIO descriptor. */
 361                         goto got_gpio;
 362                 } else if (gpios[i].gpiod_dev) {
 363                         /* Get a GPIO descriptor */
 364                         gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
 365                                                         gpios[i].name,
 366                                                         gpios[i].idx, GPIOD_IN);
 367                         if (IS_ERR(gpios[i].desc)) {
 368                                 ret = PTR_ERR(gpios[i].desc);
 369                                 dev_err(gpios[i].gpiod_dev,
 370                                         "ASoC: Cannot get gpio at index %d: %d",
 371                                         i, ret);
 372                                 goto undo;
 373                         }
 374                 } else {
 375                         /* legacy GPIO number */
 376                         if (!gpio_is_valid(gpios[i].gpio)) {
 377                                 dev_err(jack->card->dev,
 378                                         "ASoC: Invalid gpio %d\n",
 379                                         gpios[i].gpio);
 380                                 ret = -EINVAL;
 381                                 goto undo;
 382                         }
 383
 384                         ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
 385                                                gpios[i].name);
 386                         if (ret)
 387                                 goto undo;
 388
 389                         gpios[i].desc = gpio_to_desc(gpios[i].gpio);
 390                 }
 391 got_gpio:
 392                 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
 393                 gpios[i].jack = jack;
 394
 395                 ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
 396                                               gpio_handler,
 397                                               IRQF_TRIGGER_RISING |
 398                                               IRQF_TRIGGER_FALLING,
 399                                               gpios[i].name,
 400                                               &gpios[i]);
 401                 if (ret < 0)
 402                         goto err;
 403
 404                 if (gpios[i].wake) {
 405                         ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
 406                         if (ret != 0)
 407                                 dev_err(jack->card->dev,
 408                                         "ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
 409                                         i, ret);
 410                 }
 411
 412                 /*
 413                  * Register PM notifier so we do not miss state transitions
 414                  * happening while system is asleep.
 415                  */
 416                 gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
 417                 register_pm_notifier(&gpios[i].pm_notifier);
 418
 419                 /* Expose GPIO value over sysfs for diagnostic purposes */
 420                 gpiod_export(gpios[i].desc, false);
 421
 422                 /* Update initial jack status */
 423                 schedule_delayed_work(&gpios[i].work,
 424                                       msecs_to_jiffies(gpios[i].debounce_time));
 425         }
 426
 427         return 0;
 428
 429 err:
 430         gpio_free(gpios[i].gpio);
 431 undo:
 432         snd_soc_jack_free_gpios(jack, i, gpios);
 433
 434         return ret;
 435 }
 436 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
 437
 438 /**
 439  * snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
 440  *
 441  * @gpiod_dev: GPIO consumer device
 442  * @jack:      ASoC jack
 443  * @count:     number of pins
 444  * @gpios:     array of gpio pins
 445  *
 446  * This function will request gpio, set data direction and request irq
 447  * for each gpio in the array.
 448  */
 449 int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
 450                             struct snd_soc_jack *jack,
 451                             int count, struct snd_soc_jack_gpio *gpios)
 452 {
 453         int i;
 454
 455         for (i = 0; i < count; i++)
 456                 gpios[i].gpiod_dev = gpiod_dev;
 457
 458         return snd_soc_jack_add_gpios(jack, count, gpios);
 459 }
 460 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
 461
 462 /**
 463  * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
 464  *
 465  * @jack:  ASoC jack
 466  * @count: number of pins
 467  * @gpios: array of gpio pins
 468  *
 469  * Release gpio and irq resources for gpio pins associated with an ASoC jack.
 470  */
 471 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 472                         struct snd_soc_jack_gpio *gpios)
 473 {
 474         int i;
 475
 476         for (i = 0; i < count; i++) {
 477                 gpiod_unexport(gpios[i].desc);
 478                 unregister_pm_notifier(&gpios[i].pm_notifier);
 479                 free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
 480                 cancel_delayed_work_sync(&gpios[i].work);
 481                 gpiod_put(gpios[i].desc);
 482                 gpios[i].jack = NULL;
 483         }
 484 }
 485 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
 486 #endif  /* CONFIG_GPIOLIB */