1 files changed, 386 insertions, 0 deletions

diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c
new file mode 100644
index 00000000..fa31d9c2
--- /dev/null
+++ b/sound/soc/soc-jack.c
@@ -0,0 +1,386 @@
+/*
+ * 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/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <trace/events/asoc.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_codec *codec, const char *id, int type,
+		     struct snd_soc_jack *jack)
+{
+	jack->codec = codec;
+	INIT_LIST_HEAD(&jack->pins);
+	INIT_LIST_HEAD(&jack->jack_zones);
+	BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier);
+
+	return snd_jack_new(codec->card->snd_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;
+	struct snd_soc_dapm_context *dapm;
+	struct snd_soc_jack_pin *pin;
+	int enable;
+	int oldstatus;
+
+	trace_snd_soc_jack_report(jack, mask, status);
+
+	if (!jack)
+		return;
+
+	codec = jack->codec;
+	dapm =  &codec->dapm;
+
+	mutex_lock(&codec->mutex);
+
+	oldstatus = jack->status;
+
+	jack->status &= ~mask;
+	jack->status |= status & mask;
+
+	/* The DAPM sync is expensive enough to be worth skipping.
+	 * However, empty mask means pin synchronization is desired. */
+	if (mask && (jack->status == oldstatus))
+		goto out;
+
+	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);
+	}
+
+	/* Report before the DAPM sync to help users updating micbias status */
+	blocking_notifier_call_chain(&jack->notifier, status, jack);
+
+	snd_soc_dapm_sync(dapm);
+
+	snd_jack_report(jack->jack, jack->status);
+
+out:
+	mutex_unlock(&codec->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
+ * @zone:  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 delcared in the jack type
+ *
+ * @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 delcared 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) {
+			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);
+
+/**
+ * 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 = gpio_get_value_cansleep(gpio->gpio);
+	if (gpio->invert)
+		enable = !enable;
+
+	if (enable)
+		report = gpio->report;
+	else
+		report = 0;
+
+	if (gpio->jack_status_check)
+		report = gpio->jack_status_check();
+
+	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->codec->card->dev;
+
+	trace_snd_soc_jack_irq(gpio->name);
+
+	if (device_may_wakeup(dev))
+		pm_wakeup_event(dev, gpio->debounce_time + 50);
+
+	schedule_delayed_work(&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 (!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;
+
+		INIT_DELAYED_WORK(&gpios[i].work, gpio_work);
+		gpios[i].jack = jack;
+
+		ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio),
+					      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(gpio_to_irq(gpios[i].gpio), 1);
+			if (ret != 0)
+				printk(KERN_ERR
+				  "Failed to mark GPIO %d as wake source: %d\n",
+					gpios[i].gpio, ret);
+		}
+
+#ifdef CONFIG_GPIO_SYSFS
+		/* Expose GPIO value over sysfs for diagnostic purposes */
+		gpio_export(gpios[i].gpio, false);
+#endif
+
+		/* Update initial jack status */
+		snd_soc_jack_gpio_detect(&gpios[i]);
+	}
+
+	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++) {
+#ifdef CONFIG_GPIO_SYSFS
+		gpio_unexport(gpios[i].gpio);
+#endif
+		free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
+		cancel_delayed_work_sync(&gpios[i].work);
+		gpio_free(gpios[i].gpio);
+		gpios[i].jack = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
+#endif	/* CONFIG_GPIOLIB */