sound/soc/soc-jack.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // soc-jack.c  --  ALSA SoC jack handling
   4 //
   5 // Copyright 2008 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <sound/jack.h>
  10 #include <sound/soc.h>
  11 #include <linux/gpio.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/delay.h>
  16 #include <linux/export.h>
  17 #include <linux/suspend.h>
  18 #include <trace/events/asoc.h>
  19
  20 /**
  21  * snd_soc_jack_report - Report the current status for a jack
  22  *
  23  * @jack:   the jack
  24  * @status: a bitmask of enum snd_jack_type values that are currently detected.
  25  * @mask:   a bitmask of enum snd_jack_type values that being reported.
  26  *
  27  * If configured using snd_soc_jack_add_pins() then the associated
  28  * DAPM pins will be enabled or disabled as appropriate and DAPM
  29  * synchronised.
  30  *
  31  * Note: This function uses mutexes and should be called from a
  32  * context which can sleep (such as a workqueue).
  33  */
  34 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
  35 {
  36         struct snd_soc_dapm_context *dapm;
  37         struct snd_soc_jack_pin *pin;
  38         unsigned int sync = 0;
  39
  40         if (!jack)
  41                 return;
  42         trace_snd_soc_jack_report(jack, mask, status);
  43
  44         dapm = &jack->card->dapm;
  45
  46         mutex_lock(&jack->mutex);
  47
  48         jack->status &= ~mask;
  49         jack->status |= status & mask;
  50
  51         trace_snd_soc_jack_notify(jack, status);
  52
  53         list_for_each_entry(pin, &jack->pins, list) {
  54                 int enable = pin->mask & jack->status;
  55
  56                 if (pin->invert)
  57                         enable = !enable;
  58
  59                 if (enable)
  60                         snd_soc_dapm_enable_pin(dapm, pin->pin);
  61                 else
  62                         snd_soc_dapm_disable_pin(dapm, pin->pin);
  63
  64                 /* we need to sync for this case only */
  65                 sync = 1;
  66         }
  67
  68         /* Report before the DAPM sync to help users updating micbias status */
  69         blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
  70
  71         if (sync)
  72                 snd_soc_dapm_sync(dapm);
  73
  74         snd_jack_report(jack->jack, jack->status);
  75
  76         mutex_unlock(&jack->mutex);
  77 }
  78 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
  79
  80 /**
  81  * snd_soc_jack_add_zones - Associate voltage zones with jack
  82  *
  83  * @jack:  ASoC jack
  84  * @count: Number of zones
  85  * @zones:  Array of zones
  86  *
  87  * After this function has been called the zones specified in the
  88  * array will be associated with the jack.
  89  */
  90 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
  91                           struct snd_soc_jack_zone *zones)
  92 {
  93         int i;
  94
  95         for (i = 0; i < count; i++) {
  96                 INIT_LIST_HEAD(&zones[i].list);
  97                 list_add(&(zones[i].list), &jack->jack_zones);
  98         }
  99         return 0;
 100 }
 101 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
 102
 103 /**
 104  * snd_soc_jack_get_type - Based on the mic bias value, this function returns
 105  * the type of jack from the zones declared in the jack type
 106  *
 107  * @jack:  ASoC jack
 108  * @micbias_voltage:  mic bias voltage at adc channel when jack is plugged in
 109  *
 110  * Based on the mic bias value passed, this function helps identify
 111  * the type of jack from the already declared jack zones
 112  */
 113 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
 114 {
 115         struct snd_soc_jack_zone *zone;
 116
 117         list_for_each_entry(zone, &jack->jack_zones, list) {
 118                 if (micbias_voltage >= zone->min_mv &&
 119                         micbias_voltage < zone->max_mv)
 120                                 return zone->jack_type;
 121         }
 122         return 0;
 123 }
 124 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
 125
 126 /**
 127  * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
 128  *
 129  * @jack:  ASoC jack created with snd_soc_card_jack_new_pins()
 130  * @count: Number of pins
 131  * @pins:  Array of pins
 132  *
 133  * After this function has been called the DAPM pins specified in the
 134  * pins array will have their status updated to reflect the current
 135  * state of the jack whenever the jack status is updated.
 136  */
 137 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
 138                           struct snd_soc_jack_pin *pins)
 139 {
 140         int i;
 141
 142         for (i = 0; i < count; i++) {
 143                 if (!pins[i].pin) {
 144                         dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
 145                                 i);
 146                         return -EINVAL;
 147                 }
 148                 if (!pins[i].mask) {
 149                         dev_err(jack->card->dev, "ASoC: No mask for pin %d"
 150                                 " (%s)\n", i, pins[i].pin);
 151                         return -EINVAL;
 152                 }
 153
 154                 INIT_LIST_HEAD(&pins[i].list);
 155                 list_add(&(pins[i].list), &jack->pins);
 156                 snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
 157         }
 158
 159         /* Update to reflect the last reported status; canned jack
 160          * implementations are likely to set their state before the
 161          * card has an opportunity to associate pins.
 162          */
 163         snd_soc_jack_report(jack, 0, 0);
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
 168
 169 /**
 170  * snd_soc_jack_notifier_register - Register a notifier for jack status
 171  *
 172  * @jack:  ASoC jack
 173  * @nb:    Notifier block to register
 174  *
 175  * Register for notification of the current status of the jack.  Note
 176  * that it is not possible to report additional jack events in the
 177  * callback from the notifier, this is intended to support
 178  * applications such as enabling electrical detection only when a
 179  * mechanical detection event has occurred.
 180  */
 181 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
 182                                     struct notifier_block *nb)
 183 {
 184         blocking_notifier_chain_register(&jack->notifier, nb);
 185 }
 186 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
 187
 188 /**
 189  * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
 190  *
 191  * @jack:  ASoC jack
 192  * @nb:    Notifier block to unregister
 193  *
 194  * Stop notifying for status changes.
 195  */
 196 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
 197                                       struct notifier_block *nb)
 198 {
 199         blocking_notifier_chain_unregister(&jack->notifier, nb);
 200 }
 201 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
 202
 203 #ifdef CONFIG_GPIOLIB
 204 struct jack_gpio_tbl {
 205         int count;
 206         struct snd_soc_jack *jack;
 207         struct snd_soc_jack_gpio *gpios;
 208 };
 209
 210 /* gpio detect */
 211 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
 212 {
 213         struct snd_soc_jack *jack = gpio->jack;
 214         int enable;
 215         int report;
 216
 217         enable = gpiod_get_value_cansleep(gpio->desc);
 218         if (gpio->invert)
 219                 enable = !enable;
 220
 221         if (enable)
 222                 report = gpio->report;
 223         else
 224                 report = 0;
 225
 226         if (gpio->jack_status_check)
 227                 report = gpio->jack_status_check(gpio->data);
 228
 229         snd_soc_jack_report(jack, report, gpio->report);
 230 }
 231
 232 /* irq handler for gpio pin */
 233 static irqreturn_t gpio_handler(int irq, void *data)
 234 {
 235         struct snd_soc_jack_gpio *gpio = data;
 236         struct device *dev = gpio->jack->card->dev;
 237
 238         trace_snd_soc_jack_irq(gpio->name);
 239
 240         if (device_may_wakeup(dev))
 241                 pm_wakeup_event(dev, gpio->debounce_time + 50);
 242
 243         queue_delayed_work(system_power_efficient_wq, &gpio->work,
 244                               msecs_to_jiffies(gpio->debounce_time));
 245
 246         return IRQ_HANDLED;
 247 }
 248
 249 /* gpio work */
 250 static void gpio_work(struct work_struct *work)
 251 {
 252         struct snd_soc_jack_gpio *gpio;
 253
 254         gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
 255         snd_soc_jack_gpio_detect(gpio);
 256 }
 257
 258 static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
 259                                     unsigned long action, void *data)
 260 {
 261         struct snd_soc_jack_gpio *gpio =
 262                         container_of(nb, struct snd_soc_jack_gpio, pm_notifier);
 263
 264         switch (action) {
 265         case PM_POST_SUSPEND:
 266         case PM_POST_HIBERNATION:
 267         case PM_POST_RESTORE:
 268                 /*
 269                  * Use workqueue so we do not have to care about running
 270                  * concurrently with work triggered by the interrupt handler.
 271                  */
 272                 queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
 273                 break;
 274         }
 275
 276         return NOTIFY_DONE;
 277 }
 278
 279 static void jack_free_gpios(struct snd_soc_jack *jack, int count,
 280                             struct snd_soc_jack_gpio *gpios)
 281 {
 282         int i;
 283
 284         for (i = 0; i < count; i++) {
 285                 gpiod_unexport(gpios[i].desc);
 286                 unregister_pm_notifier(&gpios[i].pm_notifier);
 287                 free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
 288                 cancel_delayed_work_sync(&gpios[i].work);
 289                 gpiod_put(gpios[i].desc);
 290                 gpios[i].jack = NULL;
 291         }
 292 }
 293
 294 static void jack_devres_free_gpios(struct device *dev, void *res)
 295 {
 296         struct jack_gpio_tbl *tbl = res;
 297
 298         jack_free_gpios(tbl->jack, tbl->count, tbl->gpios);
 299 }
 300
 301 /**
 302  * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
 303  *
 304  * @jack:  ASoC jack
 305  * @count: number of pins
 306  * @gpios: array of gpio pins
 307  *
 308  * This function will request gpio, set data direction and request irq
 309  * for each gpio in the array.
 310  */
 311 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 312                         struct snd_soc_jack_gpio *gpios)
 313 {
 314         int i, ret;
 315         struct jack_gpio_tbl *tbl;
 316
 317         tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL);
 318         if (!tbl)
 319                 return -ENOMEM;
 320         tbl->jack = jack;
 321         tbl->count = count;
 322         tbl->gpios = gpios;
 323
 324         for (i = 0; i < count; i++) {
 325                 if (!gpios[i].name) {
 326                         dev_err(jack->card->dev,
 327                                 "ASoC: No name for gpio at index %d\n", i);
 328                         ret = -EINVAL;
 329                         goto undo;
 330                 }
 331
 332                 if (gpios[i].desc) {
 333                         /* Already have a GPIO descriptor. */
 334                         goto got_gpio;
 335                 } else if (gpios[i].gpiod_dev) {
 336                         /* Get a GPIO descriptor */
 337                         gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
 338                                                         gpios[i].name,
 339                                                         gpios[i].idx, GPIOD_IN);
 340                         if (IS_ERR(gpios[i].desc)) {
 341                                 ret = PTR_ERR(gpios[i].desc);
 342                                 dev_err(gpios[i].gpiod_dev,
 343                                         "ASoC: Cannot get gpio at index %d: %d",
 344                                         i, ret);
 345                                 goto undo;
 346                         }
 347                 } else {
 348                         /* legacy GPIO number */
 349                         if (!gpio_is_valid(gpios[i].gpio)) {
 350                                 dev_err(jack->card->dev,
 351                                         "ASoC: Invalid gpio %d\n",
 352                                         gpios[i].gpio);
 353                                 ret = -EINVAL;
 354                                 goto undo;
 355                         }
 356
 357                         ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
 358                                                gpios[i].name);
 359                         if (ret)
 360                                 goto undo;
 361
 362                         gpios[i].desc = gpio_to_desc(gpios[i].gpio);
 363                 }
 364 got_gpio:
 365                 INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
 366                 gpios[i].jack = jack;
 367
 368                 ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
 369                                               gpio_handler,
 370                                               IRQF_TRIGGER_RISING |
 371                                               IRQF_TRIGGER_FALLING,
 372                                               gpios[i].name,
 373                                               &gpios[i]);
 374                 if (ret < 0)
 375                         goto err;
 376
 377                 if (gpios[i].wake) {
 378                         ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
 379                         if (ret != 0)
 380                                 dev_err(jack->card->dev,
 381                                         "ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
 382                                         i, ret);
 383                 }
 384
 385                 /*
 386                  * Register PM notifier so we do not miss state transitions
 387                  * happening while system is asleep.
 388                  */
 389                 gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
 390                 register_pm_notifier(&gpios[i].pm_notifier);
 391
 392                 /* Expose GPIO value over sysfs for diagnostic purposes */
 393                 gpiod_export(gpios[i].desc, false);
 394
 395                 /* Update initial jack status */
 396                 schedule_delayed_work(&gpios[i].work,
 397                                       msecs_to_jiffies(gpios[i].debounce_time));
 398         }
 399
 400         devres_add(jack->card->dev, tbl);
 401         return 0;
 402
 403 err:
 404         gpio_free(gpios[i].gpio);
 405 undo:
 406         jack_free_gpios(jack, i, gpios);
 407         devres_free(tbl);
 408
 409         return ret;
 410 }
 411 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
 412
 413 /**
 414  * snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
 415  *
 416  * @gpiod_dev: GPIO consumer device
 417  * @jack:      ASoC jack
 418  * @count:     number of pins
 419  * @gpios:     array of gpio pins
 420  *
 421  * This function will request gpio, set data direction and request irq
 422  * for each gpio in the array.
 423  */
 424 int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
 425                             struct snd_soc_jack *jack,
 426                             int count, struct snd_soc_jack_gpio *gpios)
 427 {
 428         int i;
 429
 430         for (i = 0; i < count; i++)
 431                 gpios[i].gpiod_dev = gpiod_dev;
 432
 433         return snd_soc_jack_add_gpios(jack, count, gpios);
 434 }
 435 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
 436
 437 /**
 438  * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
 439  *
 440  * @jack:  ASoC jack
 441  * @count: number of pins
 442  * @gpios: array of gpio pins
 443  *
 444  * Release gpio and irq resources for gpio pins associated with an ASoC jack.
 445  */
 446 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 447                         struct snd_soc_jack_gpio *gpios)
 448 {
 449         jack_free_gpios(jack, count, gpios);
 450         devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL);
 451 }
 452 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
 453 #endif  /* CONFIG_GPIOLIB */