280 lines
6.5 KiB
C
280 lines
6.5 KiB
C
/*
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* soc-jack.c -- ALSA SoC jack handling
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <sound/jack.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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/**
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* snd_soc_jack_new - Create a new jack
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* @card: ASoC card
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* @id: an identifying string for this jack
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* @type: a bitmask of enum snd_jack_type values that can be detected by
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* this jack
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* @jack: structure to use for the jack
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*
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* Creates a new jack object.
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*
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* Returns zero if successful, or a negative error code on failure.
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* On success jack will be initialised.
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*/
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int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
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struct snd_soc_jack *jack)
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{
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jack->card = card;
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INIT_LIST_HEAD(&jack->pins);
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return snd_jack_new(card->codec->card, id, type, &jack->jack);
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_new);
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/**
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* snd_soc_jack_report - Report the current status for a jack
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*
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* @jack: the jack
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* @status: a bitmask of enum snd_jack_type values that are currently detected.
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* @mask: a bitmask of enum snd_jack_type values that being reported.
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*
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* If configured using snd_soc_jack_add_pins() then the associated
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* DAPM pins will be enabled or disabled as appropriate and DAPM
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* synchronised.
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*
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* Note: This function uses mutexes and should be called from a
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* context which can sleep (such as a workqueue).
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*/
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void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
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{
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struct snd_soc_codec *codec = jack->card->codec;
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struct snd_soc_jack_pin *pin;
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int enable;
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int oldstatus;
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if (!jack) {
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WARN_ON_ONCE(!jack);
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return;
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}
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mutex_lock(&codec->mutex);
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oldstatus = jack->status;
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jack->status &= ~mask;
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jack->status |= status & mask;
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/* The DAPM sync is expensive enough to be worth skipping.
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* However, empty mask means pin synchronization is desired. */
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if (mask && (jack->status == oldstatus))
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goto out;
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list_for_each_entry(pin, &jack->pins, list) {
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enable = pin->mask & jack->status;
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if (pin->invert)
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enable = !enable;
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if (enable)
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snd_soc_dapm_enable_pin(codec, pin->pin);
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else
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snd_soc_dapm_disable_pin(codec, pin->pin);
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}
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snd_soc_dapm_sync(codec);
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snd_jack_report(jack->jack, status);
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out:
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mutex_unlock(&codec->mutex);
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_report);
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/**
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* snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
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*
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* @jack: ASoC jack
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* @count: Number of pins
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* @pins: Array of pins
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*
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* After this function has been called the DAPM pins specified in the
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* pins array will have their status updated to reflect the current
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* state of the jack whenever the jack status is updated.
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*/
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int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
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struct snd_soc_jack_pin *pins)
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{
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int i;
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for (i = 0; i < count; i++) {
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if (!pins[i].pin) {
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printk(KERN_ERR "No name for pin %d\n", i);
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return -EINVAL;
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}
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if (!pins[i].mask) {
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printk(KERN_ERR "No mask for pin %d (%s)\n", i,
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pins[i].pin);
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return -EINVAL;
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}
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INIT_LIST_HEAD(&pins[i].list);
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list_add(&(pins[i].list), &jack->pins);
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}
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/* Update to reflect the last reported status; canned jack
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* implementations are likely to set their state before the
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* card has an opportunity to associate pins.
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*/
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snd_soc_jack_report(jack, 0, 0);
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
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#ifdef CONFIG_GPIOLIB
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/* gpio detect */
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static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
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{
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struct snd_soc_jack *jack = gpio->jack;
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int enable;
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int report;
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if (gpio->debounce_time > 0)
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mdelay(gpio->debounce_time);
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enable = gpio_get_value(gpio->gpio);
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if (gpio->invert)
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enable = !enable;
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if (enable)
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report = gpio->report;
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else
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report = 0;
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snd_soc_jack_report(jack, report, gpio->report);
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}
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/* irq handler for gpio pin */
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static irqreturn_t gpio_handler(int irq, void *data)
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{
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struct snd_soc_jack_gpio *gpio = data;
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schedule_work(&gpio->work);
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return IRQ_HANDLED;
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}
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/* gpio work */
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static void gpio_work(struct work_struct *work)
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{
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struct snd_soc_jack_gpio *gpio;
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gpio = container_of(work, struct snd_soc_jack_gpio, work);
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snd_soc_jack_gpio_detect(gpio);
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}
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/**
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* snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
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*
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* @jack: ASoC jack
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* @count: number of pins
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* @gpios: array of gpio pins
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*
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* This function will request gpio, set data direction and request irq
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* for each gpio in the array.
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*/
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int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
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struct snd_soc_jack_gpio *gpios)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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if (!gpio_is_valid(gpios[i].gpio)) {
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printk(KERN_ERR "Invalid gpio %d\n",
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gpios[i].gpio);
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ret = -EINVAL;
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goto undo;
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}
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if (!gpios[i].name) {
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printk(KERN_ERR "No name for gpio %d\n",
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gpios[i].gpio);
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ret = -EINVAL;
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goto undo;
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}
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ret = gpio_request(gpios[i].gpio, gpios[i].name);
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if (ret)
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goto undo;
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ret = gpio_direction_input(gpios[i].gpio);
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if (ret)
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goto err;
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INIT_WORK(&gpios[i].work, gpio_work);
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gpios[i].jack = jack;
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ret = request_irq(gpio_to_irq(gpios[i].gpio),
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gpio_handler,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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jack->card->dev->driver->name,
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&gpios[i]);
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if (ret)
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goto err;
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#ifdef CONFIG_GPIO_SYSFS
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/* Expose GPIO value over sysfs for diagnostic purposes */
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gpio_export(gpios[i].gpio, false);
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#endif
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/* Update initial jack status */
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snd_soc_jack_gpio_detect(&gpios[i]);
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}
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return 0;
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err:
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gpio_free(gpios[i].gpio);
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undo:
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snd_soc_jack_free_gpios(jack, i, gpios);
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
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/**
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* snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
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*
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* @jack: ASoC jack
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* @count: number of pins
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* @gpios: array of gpio pins
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*
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* Release gpio and irq resources for gpio pins associated with an ASoC jack.
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*/
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void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
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struct snd_soc_jack_gpio *gpios)
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{
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int i;
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for (i = 0; i < count; i++) {
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#ifdef CONFIG_GPIO_SYSFS
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gpio_unexport(gpios[i].gpio);
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#endif
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free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
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gpio_free(gpios[i].gpio);
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gpios[i].jack = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
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#endif /* CONFIG_GPIOLIB */
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