--- /dev/null
+/*
+ * 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/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <trace/events/asoc.h>
+
+/**
+ * snd_soc_card_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
+ * @pins: Array of jack pins to be added to the jack or NULL
+ * @num_pins: Number of elements in the @pins array
+ *
+ * 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_card_jack_new(struct snd_soc_card *card, const char *id, int type,
+ struct snd_soc_jack *jack, struct snd_soc_jack_pin *pins,
+ unsigned int num_pins)
+{
+ int ret;
+
+ mutex_init(&jack->mutex);
+ jack->card = card;
+ INIT_LIST_HEAD(&jack->pins);
+ INIT_LIST_HEAD(&jack->jack_zones);
+ BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
+
+ ret = snd_jack_new(card->snd_card, id, type, &jack->jack);
+ if (ret)
+ return ret;
+
+ if (num_pins)
+ return snd_soc_jack_add_pins(jack, num_pins, pins);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_card_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_dapm_context *dapm;
+ struct snd_soc_jack_pin *pin;
+ unsigned int sync = 0;
+ int enable;
+
+ trace_snd_soc_jack_report(jack, mask, status);
+
+ if (!jack)
+ return;
+
+ dapm = &jack->card->dapm;
+
+ mutex_lock(&jack->mutex);
+
+ jack->status &= ~mask;
+ jack->status |= status & mask;
+
+ 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);
+
+ /* we need to sync for this case only */
+ sync = 1;
+ }
+
+ /* Report before the DAPM sync to help users updating micbias status */
+ blocking_notifier_call_chain(&jack->notifier, jack->status, jack);
+
+ if (sync)
+ snd_soc_dapm_sync(dapm);
+
+ snd_jack_report(jack->jack, jack->status);
+
+ mutex_unlock(&jack->mutex);
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_report);
+
+/**
+ * snd_soc_jack_add_zones - Associate voltage zones with jack
+ *
+ * @jack: ASoC jack
+ * @count: Number of zones
+ * @zones: Array of zones
+ *
+ * After this function has been called the zones specified in the
+ * array will be associated with the jack.
+ */
+int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count,
+ struct snd_soc_jack_zone *zones)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ INIT_LIST_HEAD(&zones[i].list);
+ list_add(&(zones[i].list), &jack->jack_zones);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones);
+
+/**
+ * snd_soc_jack_get_type - Based on the mic bias value, this function returns
+ * the type of jack from the zones declared in the jack type
+ *
+ * @jack: ASoC jack
+ * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in
+ *
+ * Based on the mic bias value passed, this function helps identify
+ * the type of jack from the already declared jack zones
+ */
+int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage)
+{
+ struct snd_soc_jack_zone *zone;
+
+ list_for_each_entry(zone, &jack->jack_zones, list) {
+ if (micbias_voltage >= zone->min_mv &&
+ micbias_voltage < zone->max_mv)
+ return zone->jack_type;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_get_type);
+
+/**
+ * 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) {
+ dev_err(jack->card->dev, "ASoC: No name for pin %d\n",
+ i);
+ return -EINVAL;
+ }
+ if (!pins[i].mask) {
+ dev_err(jack->card->dev, "ASoC: 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 = gpiod_get_value_cansleep(gpio->desc);
+ if (gpio->invert)
+ enable = !enable;
+
+ if (enable)
+ report = gpio->report;
+ else
+ report = 0;
+
+ if (gpio->jack_status_check)
+ report = gpio->jack_status_check(gpio->data);
+
+ 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->card->dev;
+
+ trace_snd_soc_jack_irq(gpio->name);
+
+ if (device_may_wakeup(dev))
+ pm_wakeup_event(dev, gpio->debounce_time + 50);
+
+ queue_delayed_work(system_power_efficient_wq, &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 (!gpios[i].name) {
+ dev_err(jack->card->dev,
+ "ASoC: No name for gpio at index %d\n", i);
+ ret = -EINVAL;
+ goto undo;
+ }
+
+ if (gpios[i].gpiod_dev) {
+ /* GPIO descriptor */
+ gpios[i].desc = gpiod_get_index(gpios[i].gpiod_dev,
+ gpios[i].name,
+ gpios[i].idx, GPIOD_IN);
+ if (IS_ERR(gpios[i].desc)) {
+ ret = PTR_ERR(gpios[i].desc);
+ dev_err(gpios[i].gpiod_dev,
+ "ASoC: Cannot get gpio at index %d: %d",
+ i, ret);
+ goto undo;
+ }
+ } else {
+ /* legacy GPIO number */
+ if (!gpio_is_valid(gpios[i].gpio)) {
+ dev_err(jack->card->dev,
+ "ASoC: Invalid gpio %d\n",
+ gpios[i].gpio);
+ ret = -EINVAL;
+ goto undo;
+ }
+
+ ret = gpio_request_one(gpios[i].gpio, GPIOF_IN,
+ gpios[i].name);
+ if (ret)
+ goto undo;
+
+ gpios[i].desc = gpio_to_desc(gpios[i].gpio);
+ }
+
+ INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
+ gpios[i].jack = jack;
+
+ ret = request_any_context_irq(gpiod_to_irq(gpios[i].desc),
+ gpio_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ gpios[i].name,
+ &gpios[i]);
+ if (ret < 0)
+ goto err;
+
+ if (gpios[i].wake) {
+ ret = irq_set_irq_wake(gpiod_to_irq(gpios[i].desc), 1);
+ if (ret != 0)
+ dev_err(jack->card->dev,
+ "ASoC: Failed to mark GPIO at index %d as wake source: %d\n",
+ i, ret);
+ }
+
+ /* Expose GPIO value over sysfs for diagnostic purposes */
+ gpiod_export(gpios[i].desc, false);
+
+ /* Update initial jack status */
+ schedule_delayed_work(&gpios[i].work,
+ msecs_to_jiffies(gpios[i].debounce_time));
+ }
+
+ 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_add_gpiods - Associate GPIO descriptor pins with an ASoC jack
+ *
+ * @gpiod_dev: GPIO consumer device
+ * @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_gpiods(struct device *gpiod_dev,
+ struct snd_soc_jack *jack,
+ int count, struct snd_soc_jack_gpio *gpios)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ gpios[i].gpiod_dev = gpiod_dev;
+
+ return snd_soc_jack_add_gpios(jack, count, gpios);
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpiods);
+
+/**
+ * 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++) {
+ gpiod_unexport(gpios[i].desc);
+ free_irq(gpiod_to_irq(gpios[i].desc), &gpios[i]);
+ cancel_delayed_work_sync(&gpios[i].work);
+ gpiod_put(gpios[i].desc);
+ gpios[i].jack = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
+#endif /* CONFIG_GPIOLIB */
Code Review / kvmfornfv.git / blobdiff