// SPDX-License-Identifier: GPL-2.0+
//
// soc-jack.c -- ALSA SoC jack handling
//
// Copyright 2008 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <[email protected]>
#include <sound/jack.h>
#include <sound/soc.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 {
dev_err(jack->card->dev, "ASoC: Invalid gpio at index %d\n", i);
ret = -EINVAL;
goto undo;
}
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 undo;
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;
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 */
Codebase Browser
linux