284 lines
6.5 KiB
C
284 lines
6.5 KiB
C
/*
|
|
* soc-jack.c -- ALSA SoC jack handling
|
|
*
|
|
* Copyright 2008 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <sound/jack.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/soc-dapm.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/delay.h>
|
|
|
|
/**
|
|
* snd_soc_jack_new - Create a new jack
|
|
* @card: ASoC card
|
|
* @id: an identifying string for this jack
|
|
* @type: a bitmask of enum snd_jack_type values that can be detected by
|
|
* this jack
|
|
* @jack: structure to use for the jack
|
|
*
|
|
* Creates a new jack object.
|
|
*
|
|
* Returns zero if successful, or a negative error code on failure.
|
|
* On success jack will be initialised.
|
|
*/
|
|
int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
|
|
struct snd_soc_jack *jack)
|
|
{
|
|
jack->card = card;
|
|
INIT_LIST_HEAD(&jack->pins);
|
|
|
|
return snd_jack_new(card->codec->card, id, type, &jack->jack);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_jack_new);
|
|
|
|
/**
|
|
* 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_codec *codec;
|
|
struct snd_soc_jack_pin *pin;
|
|
int enable;
|
|
int oldstatus;
|
|
|
|
if (!jack) {
|
|
WARN_ON_ONCE(!jack);
|
|
return;
|
|
}
|
|
codec = jack->card->codec;
|
|
|
|
mutex_lock(&codec->mutex);
|
|
|
|
oldstatus = jack->status;
|
|
|
|
jack->status &= ~mask;
|
|
jack->status |= status & mask;
|
|
|
|
/* The DAPM sync is expensive enough to be worth skipping.
|
|
* However, empty mask means pin synchronization is desired. */
|
|
if (mask && (jack->status == oldstatus))
|
|
goto out;
|
|
|
|
list_for_each_entry(pin, &jack->pins, list) {
|
|
enable = pin->mask & jack->status;
|
|
|
|
if (pin->invert)
|
|
enable = !enable;
|
|
|
|
if (enable)
|
|
snd_soc_dapm_enable_pin(codec, pin->pin);
|
|
else
|
|
snd_soc_dapm_disable_pin(codec, pin->pin);
|
|
}
|
|
|
|
snd_soc_dapm_sync(codec);
|
|
|
|
snd_jack_report(jack->jack, status);
|
|
|
|
out:
|
|
mutex_unlock(&codec->mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_jack_report);
|
|
|
|
/**
|
|
* snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
|
|
*
|
|
* @jack: ASoC jack
|
|
* @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) {
|
|
printk(KERN_ERR "No name for pin %d\n", i);
|
|
return -EINVAL;
|
|
}
|
|
if (!pins[i].mask) {
|
|
printk(KERN_ERR "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);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
#ifdef CONFIG_GPIOLIB
|
|
/* 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;
|
|
|
|
if (gpio->debounce_time > 0)
|
|
mdelay(gpio->debounce_time);
|
|
|
|
enable = gpio_get_value(gpio->gpio);
|
|
if (gpio->invert)
|
|
enable = !enable;
|
|
|
|
if (enable)
|
|
report = gpio->report;
|
|
else
|
|
report = 0;
|
|
|
|
if (gpio->jack_status_check)
|
|
report = gpio->jack_status_check();
|
|
|
|
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;
|
|
|
|
schedule_work(&gpio->work);
|
|
|
|
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);
|
|
snd_soc_jack_gpio_detect(gpio);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (!gpio_is_valid(gpios[i].gpio)) {
|
|
printk(KERN_ERR "Invalid gpio %d\n",
|
|
gpios[i].gpio);
|
|
ret = -EINVAL;
|
|
goto undo;
|
|
}
|
|
if (!gpios[i].name) {
|
|
printk(KERN_ERR "No name for gpio %d\n",
|
|
gpios[i].gpio);
|
|
ret = -EINVAL;
|
|
goto undo;
|
|
}
|
|
|
|
ret = gpio_request(gpios[i].gpio, gpios[i].name);
|
|
if (ret)
|
|
goto undo;
|
|
|
|
ret = gpio_direction_input(gpios[i].gpio);
|
|
if (ret)
|
|
goto err;
|
|
|
|
INIT_WORK(&gpios[i].work, gpio_work);
|
|
gpios[i].jack = jack;
|
|
|
|
ret = request_irq(gpio_to_irq(gpios[i].gpio),
|
|
gpio_handler,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
jack->card->dev->driver->name,
|
|
&gpios[i]);
|
|
if (ret)
|
|
goto err;
|
|
|
|
#ifdef CONFIG_GPIO_SYSFS
|
|
/* Expose GPIO value over sysfs for diagnostic purposes */
|
|
gpio_export(gpios[i].gpio, false);
|
|
#endif
|
|
|
|
/* Update initial jack status */
|
|
snd_soc_jack_gpio_detect(&gpios[i]);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
gpio_free(gpios[i].gpio);
|
|
undo:
|
|
snd_soc_jack_free_gpios(jack, i, gpios);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
#ifdef CONFIG_GPIO_SYSFS
|
|
gpio_unexport(gpios[i].gpio);
|
|
#endif
|
|
free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
|
|
gpio_free(gpios[i].gpio);
|
|
gpios[i].jack = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
|
|
#endif /* CONFIG_GPIOLIB */
|