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