425 lines
11 KiB
C
425 lines
11 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 <linux/gpio.h>
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#include <linux/gpio/consumer.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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#include <linux/export.h>
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#include <trace/events/asoc.h>
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/**
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* snd_soc_jack_new - Create a new jack
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* @codec: ASoC codec
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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_codec *codec, const char *id, int type,
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struct snd_soc_jack *jack)
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{
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mutex_init(&jack->mutex);
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jack->codec = codec;
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INIT_LIST_HEAD(&jack->pins);
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INIT_LIST_HEAD(&jack->jack_zones);
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BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
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return snd_jack_new(codec->component.card->snd_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;
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struct snd_soc_dapm_context *dapm;
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struct snd_soc_jack_pin *pin;
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unsigned int sync = 0;
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int enable;
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trace_snd_soc_jack_report(jack, mask, status);
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if (!jack)
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return;
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codec = jack->codec;
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dapm = &codec->dapm;
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mutex_lock(&jack->mutex);
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jack->status &= ~mask;
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jack->status |= status & mask;
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trace_snd_soc_jack_notify(jack, status);
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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(dapm, pin->pin);
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else
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snd_soc_dapm_disable_pin(dapm, pin->pin);
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/* we need to sync for this case only */
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sync = 1;
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}
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/* Report before the DAPM sync to help users updating micbias status */
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blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
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if (sync)
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snd_soc_dapm_sync(dapm);
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snd_jack_report(jack->jack, jack->status);
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mutex_unlock(&jack->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_zones - Associate voltage zones with jack
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*
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* @jack: ASoC jack
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* @count: Number of zones
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* @zones: Array of zones
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*
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* After this function has been called the zones specified in the
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* array will be associated with the jack.
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*/
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int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
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struct snd_soc_jack_zone *zones)
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{
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int i;
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for (i = 0; i < count; i++) {
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INIT_LIST_HEAD(&zones[i].list);
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list_add(&(zones[i].list), &jack->jack_zones);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
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/**
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* snd_soc_jack_get_type - Based on the mic bias value, this function returns
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* the type of jack from the zones declared in the jack type
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*
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* @jack: ASoC jack
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* @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
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*
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* Based on the mic bias value passed, this function helps identify
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* the type of jack from the already declared jack zones
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*/
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int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
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{
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struct snd_soc_jack_zone *zone;
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list_for_each_entry(zone, &jack->jack_zones, list) {
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if (micbias_voltage >= zone->min_mv &&
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micbias_voltage < zone->max_mv)
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return zone->jack_type;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
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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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dev_err(jack->codec->dev, "ASoC: No name for pin %d\n",
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i);
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return -EINVAL;
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}
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if (!pins[i].mask) {
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dev_err(jack->codec->dev, "ASoC: No mask for pin %d"
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" (%s)\n", i, 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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/**
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* snd_soc_jack_notifier_register - Register a notifier for jack status
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*
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* @jack: ASoC jack
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* @nb: Notifier block to register
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*
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* Register for notification of the current status of the jack. Note
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* that it is not possible to report additional jack events in the
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* callback from the notifier, this is intended to support
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* applications such as enabling electrical detection only when a
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* mechanical detection event has occurred.
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*/
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void snd_soc_jack_notifier_register(struct snd_soc_jack *jack,
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struct notifier_block *nb)
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{
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blocking_notifier_chain_register(&jack->notifier, nb);
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register);
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/**
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* snd_soc_jack_notifier_unregister - Unregister a notifier for jack status
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*
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* @jack: ASoC jack
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* @nb: Notifier block to unregister
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*
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* Stop notifying for status changes.
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*/
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void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack,
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struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&jack->notifier, nb);
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister);
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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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enable = gpiod_get_value_cansleep(gpio->desc);
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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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if (gpio->jack_status_check)
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report = gpio->jack_status_check(gpio->data);
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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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struct device *dev = gpio->jack->codec->component.card->dev;
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trace_snd_soc_jack_irq(gpio->name);
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if (device_may_wakeup(dev))
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pm_wakeup_event(dev, gpio->debounce_time + 50);
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queue_delayed_work(system_power_efficient_wq, &gpio->work,
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msecs_to_jiffies(gpio->debounce_time));
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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.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 (!gpios[i].name) {
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dev_err(jack->codec->dev,
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"ASoC: No name for gpio at index %d\n", i);
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ret = -EINVAL;
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goto undo;
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}
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if (gpios[i].gpiod_dev) {
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/* GPIO descriptor */
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gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
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gpios[i].name,
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gpios[i].idx, GPIOD_IN);
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if (IS_ERR(gpios[i].desc)) {
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ret = PTR_ERR(gpios[i].desc);
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dev_err(gpios[i].gpiod_dev,
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"ASoC: Cannot get gpio at index %d: %d",
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i, ret);
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goto undo;
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}
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} else {
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/* legacy GPIO number */
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if (!gpio_is_valid(gpios[i].gpio)) {
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dev_err(jack->codec->dev,
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"ASoC: 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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ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
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gpios[i].name);
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if (ret)
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goto undo;
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gpios[i].desc = gpio_to_desc(gpios[i].gpio);
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}
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INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
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gpios[i].jack = jack;
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ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
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gpio_handler,
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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gpios[i].name,
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&gpios[i]);
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if (ret < 0)
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goto err;
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if (gpios[i].wake) {
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ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
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if (ret != 0)
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dev_err(jack->codec->dev,
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"ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
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i, ret);
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}
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/* Expose GPIO value over sysfs for diagnostic purposes */
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gpiod_export(gpios[i].desc, false);
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/* Update initial jack status */
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schedule_delayed_work(&gpios[i].work,
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msecs_to_jiffies(gpios[i].debounce_time));
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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_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
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*
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* @gpiod_dev: GPIO consumer device
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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_gpiods(struct device *gpiod_dev,
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struct snd_soc_jack *jack,
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int count, 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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gpios[i].gpiod_dev = gpiod_dev;
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return snd_soc_jack_add_gpios(jack, count, gpios);
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}
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EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
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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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gpiod_unexport(gpios[i].desc);
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free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
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cancel_delayed_work_sync(&gpios[i].work);
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gpiod_put(gpios[i].desc);
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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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