1 files changed, 149 insertions, 0 deletions

diff --git a/kernel/include/linux/iio/trigger.h b/kernel/include/linux/iio/trigger.h
new file mode 100644
index 000000000..fa76c79a5
--- /dev/null
+++ b/kernel/include/linux/iio/trigger.h
@@ -0,0 +1,149 @@
+/* The industrial I/O core, trigger handling functions
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/atomic.h>
+
+#ifndef _IIO_TRIGGER_H_
+#define _IIO_TRIGGER_H_
+
+#ifdef CONFIG_IIO_TRIGGER
+struct iio_subirq {
+	bool enabled;
+};
+
+/**
+ * struct iio_trigger_ops - operations structure for an iio_trigger.
+ * @owner:		used to monitor usage count of the trigger.
+ * @set_trigger_state:	switch on/off the trigger on demand
+ * @try_reenable:	function to reenable the trigger when the
+ *			use count is zero (may be NULL)
+ * @validate_device:	function to validate the device when the
+ *			current trigger gets changed.
+ *
+ * This is typically static const within a driver and shared by
+ * instances of a given device.
+ **/
+struct iio_trigger_ops {
+	struct module *owner;
+	int (*set_trigger_state)(struct iio_trigger *trig, bool state);
+	int (*try_reenable)(struct iio_trigger *trig);
+	int (*validate_device)(struct iio_trigger *trig,
+			       struct iio_dev *indio_dev);
+};
+
+
+/**
+ * struct iio_trigger - industrial I/O trigger device
+ * @ops:		[DRIVER] operations structure
+ * @id:			[INTERN] unique id number
+ * @name:		[DRIVER] unique name
+ * @dev:		[DRIVER] associated device (if relevant)
+ * @list:		[INTERN] used in maintenance of global trigger list
+ * @alloc_list:		[DRIVER] used for driver specific trigger list
+ * @use_count:		use count for the trigger
+ * @subirq_chip:	[INTERN] associate 'virtual' irq chip.
+ * @subirq_base:	[INTERN] base number for irqs provided by trigger.
+ * @subirqs:		[INTERN] information about the 'child' irqs.
+ * @pool:		[INTERN] bitmap of irqs currently in use.
+ * @pool_lock:		[INTERN] protection of the irq pool.
+ **/
+struct iio_trigger {
+	const struct iio_trigger_ops	*ops;
+	int				id;
+	const char			*name;
+	struct device			dev;
+
+	struct list_head		list;
+	struct list_head		alloc_list;
+	atomic_t			use_count;
+
+	struct irq_chip			subirq_chip;
+	int				subirq_base;
+
+	struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
+	unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)];
+	struct mutex			pool_lock;
+};
+
+
+static inline struct iio_trigger *to_iio_trigger(struct device *d)
+{
+	return container_of(d, struct iio_trigger, dev);
+}
+
+static inline void iio_trigger_put(struct iio_trigger *trig)
+{
+	module_put(trig->ops->owner);
+	put_device(&trig->dev);
+}
+
+static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig)
+{
+	get_device(&trig->dev);
+	__module_get(trig->ops->owner);
+
+	return trig;
+}
+
+/**
+ * iio_device_set_drvdata() - Set trigger driver data
+ * @trig: IIO trigger structure
+ * @data: Driver specific data
+ *
+ * Allows to attach an arbitrary pointer to an IIO trigger, which can later be
+ * retrieved by iio_trigger_get_drvdata().
+ */
+static inline void iio_trigger_set_drvdata(struct iio_trigger *trig, void *data)
+{
+	dev_set_drvdata(&trig->dev, data);
+}
+
+/**
+ * iio_trigger_get_drvdata() - Get trigger driver data
+ * @trig: IIO trigger structure
+ *
+ * Returns the data previously set with iio_trigger_set_drvdata()
+ */
+static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
+{
+	return dev_get_drvdata(&trig->dev);
+}
+
+/**
+ * iio_trigger_register() - register a trigger with the IIO core
+ * @trig_info:	trigger to be registered
+ **/
+int iio_trigger_register(struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_unregister() - unregister a trigger from the core
+ * @trig_info:	trigger to be unregistered
+ **/
+void iio_trigger_unregister(struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_poll() - called on a trigger occurring
+ * @trig:	trigger which occurred
+ *
+ * Typically called in relevant hardware interrupt handler.
+ **/
+void iio_trigger_poll(struct iio_trigger *trig);
+void iio_trigger_poll_chained(struct iio_trigger *trig);
+
+irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
+
+__printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
+void iio_trigger_free(struct iio_trigger *trig);
+
+#else
+struct iio_trigger;
+struct iio_trigger_ops;
+#endif
+#endif /* _IIO_TRIGGER_H_ */