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454 lines
11 KiB
454 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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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 <[email protected]> |
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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 <linux/suspend.h> |
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#include <trace/events/asoc.h> |
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struct jack_gpio_tbl { |
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int count; |
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struct snd_soc_jack *jack; |
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struct snd_soc_jack_gpio *gpios; |
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}; |
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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_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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if (!jack) |
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return; |
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trace_snd_soc_jack_report(jack, mask, status); |
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dapm = &jack->card->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->card->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->card->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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snd_jack_add_new_kctl(jack->jack, pins[i].pin, pins[i].mask); |
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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->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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static int snd_soc_jack_pm_notifier(struct notifier_block *nb, |
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unsigned long action, void *data) |
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{ |
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struct snd_soc_jack_gpio *gpio = |
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container_of(nb, struct snd_soc_jack_gpio, pm_notifier); |
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switch (action) { |
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case PM_POST_SUSPEND: |
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case PM_POST_HIBERNATION: |
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case PM_POST_RESTORE: |
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/* |
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* Use workqueue so we do not have to care about running |
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* concurrently with work triggered by the interrupt handler. |
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*/ |
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queue_delayed_work(system_power_efficient_wq, &gpio->work, 0); |
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break; |
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} |
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return NOTIFY_DONE; |
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} |
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static void 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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unregister_pm_notifier(&gpios[i].pm_notifier); |
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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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static void jack_devres_free_gpios(struct device *dev, void *res) |
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{ |
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struct jack_gpio_tbl *tbl = res; |
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jack_free_gpios(tbl->jack, tbl->count, tbl->gpios); |
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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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struct jack_gpio_tbl *tbl; |
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tbl = devres_alloc(jack_devres_free_gpios, sizeof(*tbl), GFP_KERNEL); |
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if (!tbl) |
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return -ENOMEM; |
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tbl->jack = jack; |
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tbl->count = count; |
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tbl->gpios = gpios; |
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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->card->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].desc) { |
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/* Already have a GPIO descriptor. */ |
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goto got_gpio; |
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} else if (gpios[i].gpiod_dev) { |
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/* Get a 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->card->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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got_gpio: |
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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->card->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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/* |
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* Register PM notifier so we do not miss state transitions |
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* happening while system is asleep. |
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*/ |
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gpios[i].pm_notifier.notifier_call = snd_soc_jack_pm_notifier; |
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register_pm_notifier(&gpios[i].pm_notifier); |
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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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devres_add(jack->card->dev, tbl); |
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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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jack_free_gpios(jack, i, gpios); |
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devres_free(tbl); |
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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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jack_free_gpios(jack, count, gpios); |
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devres_destroy(jack->card->dev, jack_devres_free_gpios, NULL, NULL); |
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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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