/*
 * 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 <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <trace/events/asoc.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_codec *codec, const char *id, int type,
                     struct snd_soc_jack *jack)
{
        jack->codec = codec;
        INIT_LIST_HEAD(&jack->pins);
        BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);

        return snd_jack_new(codec->card->snd_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_dapm_context *dapm;
        struct snd_soc_jack_pin *pin;
        int enable;
        int oldstatus;

        trace_snd_soc_jack_report(jack, mask, status);

        if (!jack)
                return;

        codec = jack->codec;
        dapm =  &codec->dapm;

        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;

        trace_snd_soc_jack_notify(jack, status);

        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(dapm, pin->pin);
                else
                        snd_soc_dapm_disable_pin(dapm, pin->pin);
        }

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

        snd_soc_dapm_sync(dapm);

        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);

/**
 * 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
/* 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 = 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;
        struct device *dev = gpio->jack->codec->card->dev;

        trace_snd_soc_jack_irq(gpio->name);

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

        schedule_delayed_work(&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);
}

/**
 * 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_DELAYED_WORK(&gpios[i].work, gpio_work);
                gpios[i].jack = jack;

                ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
                                              gpio_handler,
                                              IRQF_TRIGGER_RISING |
                                              IRQF_TRIGGER_FALLING,
                                              jack->codec->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]);
                cancel_delayed_work_sync(&gpios[i].work);
                gpio_free(gpios[i].gpio);
                gpios[i].jack = NULL;
        }
}
EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
#endif  /* CONFIG_GPIOLIB */