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soc-jack.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 = jack->card->codec;
      struct snd_soc_jack_pin *pin;
      int enable;
      int oldstatus;

      if (!jack) {
            WARN_ON_ONCE(!jack);
            return;
      }

      mutex_lock(&codec->mutex);

      oldstatus = jack->status;

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

      /* The DAPM sync is expensive enough to be worth skipping */
      if (jack->status == oldstatus)
            goto out;

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

      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;

            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;

            INIT_WORK(&gpios[i].work, gpio_work);
            gpios[i].jack = jack;
      }

      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++) {
            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 */

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