sound/soc/soc-jack.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 //
 // soc-jack.c  --  ALSA SoC jack handling
 //
 // Copyright 2008 Wolfson Microelectronics PLC.
 //
 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

 #include <sound/jack.h>
 #include <sound/soc.h>
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/suspend.h>
 #include <trace/events/asoc.h>

 /**
  * snd_soc_jack_report - Report the current status for a jack
  *
  * @jack:   the jack
  * @status: a bitmask of enum snd_jack_type values that are currently detected.
  * @mask:   a bitmask of enum snd_jack_type values that being reported.
  *
  * If configured using snd_soc_jack_add_pins() then the associated
  * DAPM pins will be enabled or disabled as appropriate and DAPM
  * synchronised.
  *
  * Note: This function uses mutexes and should be called from a
  * context which can sleep (such as a workqueue).
  */
 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
 {
 	struct snd_soc_dapm_context *dapm;
 	struct snd_soc_jack_pin *pin;
 	unsigned int sync = 0;

 	if (!jack || !jack->jack)
 		return;
 	trace_snd_soc_jack_report(jack, mask, status);

 	dapm = &jack->card->dapm;

 	mutex_lock(&jack->mutex);

 	jack->status &= ~mask;
 	jack->status |= status & mask;

 	trace_snd_soc_jack_notify(jack, status);

 	list_for_each_entry(pin, &jack->pins, list) {
 		int enable = pin->mask & jack->status;

 		if (pin->invert)
 			enable = !enable;

 		if (enable)
 			snd_soc_dapm_enable_pin(dapm, pin->pin);
 		else
 			snd_soc_dapm_disable_pin(dapm, pin->pin);

 		/* we need to sync for this case only */
 		sync = 1;
 	}

 	/* Report before the DAPM sync to help users updating micbias status */
 	blocking_notifier_call_chain(&jack->notifier, jack->status, jack);

 	if (sync)
 		snd_soc_dapm_sync(dapm);

 	snd_jack_report(jack->jack, jack->status);

 	mutex_unlock(&jack->mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_report);

 /**
  * snd_soc_jack_add_zones - Associate voltage zones with jack
  *
  * @jack:  ASoC jack
  * @count: Number of zones
  * @zones:  Array of zones
  *
  * After this function has been called the zones specified in the
  * array will be associated with the jack.
  */
 int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
 			  struct snd_soc_jack_zone *zones)
 {
 	int i;

 	for (i = 0; i < count; i++) {
 		INIT_LIST_HEAD(&zones[i].list);
 		list_add(&(zones[i].list), &jack->jack_zones);
 	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);

 /**
  * snd_soc_jack_get_type - Based on the mic bias value, this function returns
  * the type of jack from the zones declared in the jack type
  *
  * @jack:  ASoC jack
  * @micbias_voltage:  mic bias voltage at adc channel when jack is plugged in
  *
  * Based on the mic bias value passed, this function helps identify
  * the type of jack from the already declared jack zones
  */
 int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
 {
 	struct snd_soc_jack_zone *zone;

 	list_for_each_entry(zone, &jack->jack_zones, list) {
 		if (micbias_voltage >= zone->min_mv &&
 			micbias_voltage < zone->max_mv)
 				return zone->jack_type;
 	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);

 /**
  * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
  *
  * @jack:  ASoC jack created with snd_soc_card_jack_new_pins()
  * @count: Number of pins
  * @pins:  Array of pins
  *
  * After this function has been called the DAPM pins specified in the
  * pins array will have their status updated to reflect the current
  * state of the jack whenever the jack status is updated.
  */
 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
 			  struct snd_soc_jack_pin *pins)
 {
 	int i;

 	for (i = 0; i < count; i++) {
 		if (!pins[i].pin) {
 			dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
 				i);
 			return -EINVAL;
 		}
 		if (!pins[i].mask) {
 			dev_err(jack->card->dev, "ASoC: No mask for pin %d"
 				" (%s)\n", i, pins[i].pin);
 			return -EINVAL;
 		}

 		INIT_LIST_HEAD(&pins[i].list);
 		list_add(&(pins[i].list), &jack->pins);
 		snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
 	}

 	/* Update to reflect the last reported status; canned jack
 	 * implementations are likely to set their state before the
 	 * card has an opportunity to associate pins.
 	 */
 	snd_soc_jack_report(jack, 0, 0);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);

 /**
  * snd_soc_jack_notifier_register - Register a notifier for jack status
  *
  * @jack:  ASoC jack
  * @nb:    Notifier block to register
  *
  * Register for notification of the current status of the jack.  Note
  * that it is not possible to report additional jack events in the
  * callback from the notifier, this is intended to support
  * applications such as enabling electrical detection only when a
  * mechanical detection event has occurred.
  */
 void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
 				    struct notifier_block *nb)
 {
 	blocking_notifier_chain_register(&jack->notifier, nb);
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);

 /**
  * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
  *
  * @jack:  ASoC jack
  * @nb:    Notifier block to unregister
  *
  * Stop notifying for status changes.
  */
 void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
 				      struct notifier_block *nb)
 {
 	blocking_notifier_chain_unregister(&jack->notifier, nb);
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);

 #ifdef CONFIG_GPIOLIB
 struct jack_gpio_tbl {
 	int count;
 	struct snd_soc_jack *jack;
 	struct snd_soc_jack_gpio *gpios;
 };

 /* gpio detect */
 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
 {
 	struct snd_soc_jack *jack = gpio->jack;
 	int enable;
 	int report;

 	enable = gpiod_get_value_cansleep(gpio->desc);
 	if (gpio->invert)
 		enable = !enable;

 	if (enable)
 		report = gpio->report;
 	else
 		report = 0;

 	if (gpio->jack_status_check)
 		report = gpio->jack_status_check(gpio->data);

 	snd_soc_jack_report(jack, report, gpio->report);
 }

 /* irq handler for gpio pin */
 static irqreturn_t gpio_handler(int irq, void *data)
 {
 	struct snd_soc_jack_gpio *gpio = data;
 	struct device *dev = gpio->jack->card->dev;

 	trace_snd_soc_jack_irq(gpio->name);

 	if (device_may_wakeup(dev))
 		pm_wakeup_event(dev, gpio->debounce_time + 50);

 	queue_delayed_work(system_power_efficient_wq, &gpio->work,
 			      msecs_to_jiffies(gpio->debounce_time));

 	return IRQ_HANDLED;
 }

 /* gpio work */
 static void gpio_work(struct work_struct *work)
 {
 	struct snd_soc_jack_gpio *gpio;

 	gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
 	snd_soc_jack_gpio_detect(gpio);
 }

 static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
 				    unsigned long action, void *data)
 {
 	struct snd_soc_jack_gpio *gpio =
 			container_of(nb, struct snd_soc_jack_gpio, pm_notifier);

 	switch (action) {
 	case PM_POST_SUSPEND:
 	case PM_POST_HIBERNATION:
 	case PM_POST_RESTORE:
 		/*
 		 * Use workqueue so we do not have to care about running
 		 * concurrently with work triggered by the interrupt handler.
 		 */
 		queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
 		break;
 	}

 	return NOTIFY_DONE;
 }

 static void jack_free_gpios(struct snd_soc_jack *jack, int count,
 			    struct snd_soc_jack_gpio *gpios)
 {
 	int i;

 	for (i = 0; i < count; i++) {
 		gpiod_unexport(gpios[i].desc);
 		unregister_pm_notifier(&gpios[i].pm_notifier);
 		free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
 		cancel_delayed_work_sync(&gpios[i].work);
 		gpiod_put(gpios[i].desc);
 		gpios[i].jack = NULL;
 	}
 }

 static void jack_devres_free_gpios(struct device *dev, void *res)
 {
 	struct jack_gpio_tbl *tbl = res;

 	jack_free_gpios(tbl->jack, tbl->count, tbl->gpios);
 }

 /**
  * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
  *
  * @jack:  ASoC jack
  * @count: number of pins
  * @gpios: array of gpio pins
  *
  * This function will request gpio, set data direction and request irq
  * for each gpio in the array.
  */
 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 			struct snd_soc_jack_gpio *gpios)
 {
 	int i, ret;
 	struct jack_gpio_tbl *tbl;

 	tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL);
 	if (!tbl)
 		return -ENOMEM;
 	tbl->jack = jack;
 	tbl->count = count;
 	tbl->gpios = gpios;

 	for (i = 0; i < count; i++) {
 		if (!gpios[i].name) {
 			dev_err(jack->card->dev,
 				"ASoC: No name for gpio at index %d\n", i);
 			ret = -EINVAL;
 			goto undo;
 		}

 		if (gpios[i].desc) {
 			/* Already have a GPIO descriptor. */
 			goto got_gpio;
 		} else if (gpios[i].gpiod_dev) {
 			/* Get a GPIO descriptor */
 			gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
 							gpios[i].name,
 							gpios[i].idx, GPIOD_IN);
 			if (IS_ERR(gpios[i].desc)) {
 				ret = PTR_ERR(gpios[i].desc);
 				dev_err(gpios[i].gpiod_dev,
 					"ASoC: Cannot get gpio at index %d: %d",
 					i, ret);
 				goto undo;
 			}
 		} else {
 			/* legacy GPIO number */
 			if (!gpio_is_valid(gpios[i].gpio)) {
 				dev_err(jack->card->dev,
 					"ASoC: Invalid gpio %d\n",
 					gpios[i].gpio);
 				ret = -EINVAL;
 				goto undo;
 			}

 			ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
 					       gpios[i].name);
 			if (ret)
 				goto undo;

 			gpios[i].desc = gpio_to_desc(gpios[i].gpio);
 		}
 got_gpio:
 		INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
 		gpios[i].jack = jack;

 		ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
 					      gpio_handler,
 					      IRQF_SHARED |
 					      IRQF_TRIGGER_RISING |
 					      IRQF_TRIGGER_FALLING,
 					      gpios[i].name,
 					      &gpios[i]);
 		if (ret < 0)
 			goto err;

 		if (gpios[i].wake) {
 			ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
 			if (ret != 0)
 				dev_err(jack->card->dev,
 					"ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
 					i, ret);
 		}

 		/*
 		 * Register PM notifier so we do not miss state transitions
 		 * happening while system is asleep.
 		 */
 		gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
 		register_pm_notifier(&gpios[i].pm_notifier);

 		/* Expose GPIO value over sysfs for diagnostic purposes */
 		gpiod_export(gpios[i].desc, false);

 		/* Update initial jack status */
 		schedule_delayed_work(&gpios[i].work,
 				      msecs_to_jiffies(gpios[i].debounce_time));
 	}

 	devres_add(jack->card->dev, tbl);
 	return 0;

 err:
 	gpio_free(gpios[i].gpio);
 undo:
 	jack_free_gpios(jack, i, gpios);
 	devres_free(tbl);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);

 /**
  * snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
  *
  * @gpiod_dev: GPIO consumer device
  * @jack:      ASoC jack
  * @count:     number of pins
  * @gpios:     array of gpio pins
  *
  * This function will request gpio, set data direction and request irq
  * for each gpio in the array.
  */
 int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
 			    struct snd_soc_jack *jack,
 			    int count, struct snd_soc_jack_gpio *gpios)
 {
 	int i;

 	for (i = 0; i < count; i++)
 		gpios[i].gpiod_dev = gpiod_dev;

 	return snd_soc_jack_add_gpios(jack, count, gpios);
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);

 /**
  * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
  *
  * @jack:  ASoC jack
  * @count: number of pins
  * @gpios: array of gpio pins
  *
  * Release gpio and irq resources for gpio pins associated with an ASoC jack.
  */
 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 			struct snd_soc_jack_gpio *gpios)
 {
 	jack_free_gpios(jack, count, gpios);
 	devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL);
 }
 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
 #endif	/* CONFIG_GPIOLIB */
	// SPDX-License-Identifier: GPL-2.0+
	//
	// soc-jack.c -- ALSA SoC jack handling
	//
	// Copyright 2008 Wolfson Microelectronics PLC.
	//
	// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

	#include <sound/jack.h>
	#include <sound/soc.h>
	#include <linux/gpio.h>
	#include <linux/gpio/consumer.h>
	#include <linux/interrupt.h>
	#include <linux/workqueue.h>
	#include <linux/delay.h>
	#include <linux/export.h>
	#include <linux/suspend.h>
	#include <trace/events/asoc.h>

	/**
	* snd_soc_jack_report - Report the current status for a jack
	*
	* @jack: the jack
	* @status: a bitmask of enum snd_jack_type values that are currently detected.
	* @mask: a bitmask of enum snd_jack_type values that being reported.
	*
	* If configured using snd_soc_jack_add_pins() then the associated
	* DAPM pins will be enabled or disabled as appropriate and DAPM
	* synchronised.
	*
	* Note: This function uses mutexes and should be called from a
	* context which can sleep (such as a workqueue).
	*/
	void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
	{
	struct snd_soc_dapm_context *dapm;
	struct snd_soc_jack_pin *pin;
	unsigned int sync = 0;

	if (!jack \|\| !jack->jack)
	return;
	trace_snd_soc_jack_report(jack, mask, status);

	dapm = &jack->card->dapm;

	mutex_lock(&jack->mutex);

	jack->status &= ~mask;
	jack->status \|= status & mask;

	trace_snd_soc_jack_notify(jack, status);

	list_for_each_entry(pin, &jack->pins, list) {
	int enable = pin->mask & jack->status;

	if (pin->invert)
	enable = !enable;

	if (enable)
	snd_soc_dapm_enable_pin(dapm, pin->pin);
	else
	snd_soc_dapm_disable_pin(dapm, pin->pin);

	/* we need to sync for this case only */
	sync = 1;
	}

	/* Report before the DAPM sync to help users updating micbias status */
	blocking_notifier_call_chain(&jack->notifier, jack->status, jack);

	if (sync)
	snd_soc_dapm_sync(dapm);

	snd_jack_report(jack->jack, jack->status);

	mutex_unlock(&jack->mutex);
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_report);

	/**
	* snd_soc_jack_add_zones - Associate voltage zones with jack
	*
	* @jack: ASoC jack
	* @count: Number of zones
	* @zones: Array of zones
	*
	* After this function has been called the zones specified in the
	* array will be associated with the jack.
	*/
	int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
	struct snd_soc_jack_zone *zones)
	{
	int i;

	for (i = 0; i < count; i++) {
	INIT_LIST_HEAD(&zones[i].list);
	list_add(&(zones[i].list), &jack->jack_zones);
	}
	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);

	/**
	* snd_soc_jack_get_type - Based on the mic bias value, this function returns
	* the type of jack from the zones declared in the jack type
	*
	* @jack: ASoC jack
	* @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
	*
	* Based on the mic bias value passed, this function helps identify
	* the type of jack from the already declared jack zones
	*/
	int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
	{
	struct snd_soc_jack_zone *zone;

	list_for_each_entry(zone, &jack->jack_zones, list) {
	if (micbias_voltage >= zone->min_mv &&
	micbias_voltage < zone->max_mv)
	return zone->jack_type;
	}
	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);

	/**
	* snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
	*
	* @jack: ASoC jack created with snd_soc_card_jack_new_pins()
	* @count: Number of pins
	* @pins: Array of pins
	*
	* After this function has been called the DAPM pins specified in the
	* pins array will have their status updated to reflect the current
	* state of the jack whenever the jack status is updated.
	*/
	int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
	struct snd_soc_jack_pin *pins)
	{
	int i;

	for (i = 0; i < count; i++) {
	if (!pins[i].pin) {
	dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
	i);
	return -EINVAL;
	}
	if (!pins[i].mask) {
	dev_err(jack->card->dev, "ASoC: No mask for pin %d"
	" (%s)\n", i, pins[i].pin);
	return -EINVAL;
	}

	INIT_LIST_HEAD(&pins[i].list);
	list_add(&(pins[i].list), &jack->pins);
	snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask);
	}

	/* Update to reflect the last reported status; canned jack
	* implementations are likely to set their state before the
	* card has an opportunity to associate pins.
	*/
	snd_soc_jack_report(jack, 0, 0);

	return 0;
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);

	/**
	* snd_soc_jack_notifier_register - Register a notifier for jack status
	*
	* @jack: ASoC jack
	* @nb: Notifier block to register
	*
	* Register for notification of the current status of the jack. Note
	* that it is not possible to report additional jack events in the
	* callback from the notifier, this is intended to support
	* applications such as enabling electrical detection only when a
	* mechanical detection event has occurred.
	*/
	void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
	struct notifier_block *nb)
	{
	blocking_notifier_chain_register(&jack->notifier, nb);
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);

	/**
	* snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
	*
	* @jack: ASoC jack
	* @nb: Notifier block to unregister
	*
	* Stop notifying for status changes.
	*/
	void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
	struct notifier_block *nb)
	{
	blocking_notifier_chain_unregister(&jack->notifier, nb);
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);

	#ifdef CONFIG_GPIOLIB
	struct jack_gpio_tbl {
	int count;
	struct snd_soc_jack *jack;
	struct snd_soc_jack_gpio *gpios;
	};

	/* gpio detect */
	static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
	{
	struct snd_soc_jack *jack = gpio->jack;
	int enable;
	int report;

	enable = gpiod_get_value_cansleep(gpio->desc);
	if (gpio->invert)
	enable = !enable;

	if (enable)
	report = gpio->report;
	else
	report = 0;

	if (gpio->jack_status_check)
	report = gpio->jack_status_check(gpio->data);

	snd_soc_jack_report(jack, report, gpio->report);
	}

	/* irq handler for gpio pin */
	static irqreturn_t gpio_handler(int irq, void *data)
	{
	struct snd_soc_jack_gpio *gpio = data;
	struct device *dev = gpio->jack->card->dev;

	trace_snd_soc_jack_irq(gpio->name);

	if (device_may_wakeup(dev))
	pm_wakeup_event(dev, gpio->debounce_time + 50);

	queue_delayed_work(system_power_efficient_wq, &gpio->work,
	msecs_to_jiffies(gpio->debounce_time));

	return IRQ_HANDLED;
	}

	/* gpio work */
	static void gpio_work(struct work_struct *work)
	{
	struct snd_soc_jack_gpio *gpio;

	gpio = container_of(work, struct snd_soc_jack_gpio, work.work);
	snd_soc_jack_gpio_detect(gpio);
	}

	static int snd_soc_jack_pm_notifier(struct notifier_block *nb,
	unsigned long action, void *data)
	{
	struct snd_soc_jack_gpio *gpio =
	container_of(nb, struct snd_soc_jack_gpio, pm_notifier);

	switch (action) {
	case PM_POST_SUSPEND:
	case PM_POST_HIBERNATION:
	case PM_POST_RESTORE:
	/*
	* Use workqueue so we do not have to care about running
	* concurrently with work triggered by the interrupt handler.
	*/
	queue_delayed_work(system_power_efficient_wq, &gpio->work, 0);
	break;
	}

	return NOTIFY_DONE;
	}

	static void jack_free_gpios(struct snd_soc_jack *jack, int count,
	struct snd_soc_jack_gpio *gpios)
	{
	int i;

	for (i = 0; i < count; i++) {
	gpiod_unexport(gpios[i].desc);
	unregister_pm_notifier(&gpios[i].pm_notifier);
	free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
	cancel_delayed_work_sync(&gpios[i].work);
	gpiod_put(gpios[i].desc);
	gpios[i].jack = NULL;
	}
	}

	static void jack_devres_free_gpios(struct device dev, void res)
	{
	struct jack_gpio_tbl *tbl = res;

	jack_free_gpios(tbl->jack, tbl->count, tbl->gpios);
	}

	/**
	* snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
	*
	* @jack: ASoC jack
	* @count: number of pins
	* @gpios: array of gpio pins
	*
	* This function will request gpio, set data direction and request irq
	* for each gpio in the array.
	*/
	int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
	struct snd_soc_jack_gpio *gpios)
	{
	int i, ret;
	struct jack_gpio_tbl *tbl;

	tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL);
	if (!tbl)
	return -ENOMEM;
	tbl->jack = jack;
	tbl->count = count;
	tbl->gpios = gpios;

	for (i = 0; i < count; i++) {
	if (!gpios[i].name) {
	dev_err(jack->card->dev,
	"ASoC: No name for gpio at index %d\n", i);
	ret = -EINVAL;
	goto undo;
	}

	if (gpios[i].desc) {
	/* Already have a GPIO descriptor. */
	goto got_gpio;
	} else if (gpios[i].gpiod_dev) {
	/* Get a GPIO descriptor */
	gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
	gpios[i].name,
	gpios[i].idx, GPIOD_IN);
	if (IS_ERR(gpios[i].desc)) {
	ret = PTR_ERR(gpios[i].desc);
	dev_err(gpios[i].gpiod_dev,
	"ASoC: Cannot get gpio at index %d: %d",
	i, ret);
	goto undo;
	}
	} else {
	/* legacy GPIO number */
	if (!gpio_is_valid(gpios[i].gpio)) {
	dev_err(jack->card->dev,
	"ASoC: Invalid gpio %d\n",
	gpios[i].gpio);
	ret = -EINVAL;
	goto undo;
	}

	ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
	gpios[i].name);
	if (ret)
	goto undo;

	gpios[i].desc = gpio_to_desc(gpios[i].gpio);
	}
	got_gpio:
	INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
	gpios[i].jack = jack;

	ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
	gpio_handler,
	IRQF_SHARED \|
	IRQF_TRIGGER_RISING \|
	IRQF_TRIGGER_FALLING,
	gpios[i].name,
	&gpios[i]);
	if (ret < 0)
	goto err;

	if (gpios[i].wake) {
	ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
	if (ret != 0)
	dev_err(jack->card->dev,
	"ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
	i, ret);
	}

	/*
	* Register PM notifier so we do not miss state transitions
	* happening while system is asleep.
	*/
	gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier;
	register_pm_notifier(&gpios[i].pm_notifier);

	/* Expose GPIO value over sysfs for diagnostic purposes */
	gpiod_export(gpios[i].desc, false);

	/* Update initial jack status */
	schedule_delayed_work(&gpios[i].work,
	msecs_to_jiffies(gpios[i].debounce_time));
	}

	devres_add(jack->card->dev, tbl);
	return 0;

	err:
	gpio_free(gpios[i].gpio);
	undo:
	jack_free_gpios(jack, i, gpios);
	devres_free(tbl);

	return ret;
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);

	/**
	* snd_soc_jack_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
	*
	* @gpiod_dev: GPIO consumer device
	* @jack: ASoC jack
	* @count: number of pins
	* @gpios: array of gpio pins
	*
	* This function will request gpio, set data direction and request irq
	* for each gpio in the array.
	*/
	int snd_soc_jack_add_gpiods(struct device *gpiod_dev,
	struct snd_soc_jack *jack,
	int count, struct snd_soc_jack_gpio *gpios)
	{
	int i;

	for (i = 0; i < count; i++)
	gpios[i].gpiod_dev = gpiod_dev;

	return snd_soc_jack_add_gpios(jack, count, gpios);
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);

	/**
	* snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
	*
	* @jack: ASoC jack
	* @count: number of pins
	* @gpios: array of gpio pins
	*
	* Release gpio and irq resources for gpio pins associated with an ASoC jack.
	*/
	void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
	struct snd_soc_jack_gpio *gpios)
	{
	jack_free_gpios(jack, count, gpios);
	devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL);
	}
	EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
	#endif /* CONFIG_GPIOLIB */