v4.19.13 snapshot.
diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
new file mode 100644
index 0000000..b19b720
--- /dev/null
+++ b/include/linux/iio/trigger.h
@@ -0,0 +1,186 @@
+/* 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_dev;
+struct iio_trigger;
+
+/**
+ * struct iio_trigger_ops - operations structure for an iio_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 {
+ 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
+ * @owner: [INTERN] owner of this driver module
+ * @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: [INTERN] 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.
+ * @attached_own_device:[INTERN] if we are using our own device as trigger,
+ * i.e. if we registered a poll function to the same
+ * device as the one providing the trigger.
+ **/
+struct iio_trigger {
+ const struct iio_trigger_ops *ops;
+ struct module *owner;
+ 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;
+ bool attached_own_device;
+};
+
+
+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->owner);
+ put_device(&trig->dev);
+}
+
+static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig)
+{
+ get_device(&trig->dev);
+ __module_get(trig->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
+ **/
+#define iio_trigger_register(trig_info) \
+ __iio_trigger_register((trig_info), THIS_MODULE)
+int __iio_trigger_register(struct iio_trigger *trig_info,
+ struct module *this_mod);
+
+#define devm_iio_trigger_register(dev, trig_info) \
+ __devm_iio_trigger_register((dev), (trig_info), THIS_MODULE)
+int __devm_iio_trigger_register(struct device *dev,
+ struct iio_trigger *trig_info,
+ struct module *this_mod);
+
+/**
+ * iio_trigger_unregister() - unregister a trigger from the core
+ * @trig_info: trigger to be unregistered
+ **/
+void iio_trigger_unregister(struct iio_trigger *trig_info);
+
+void devm_iio_trigger_unregister(struct device *dev,
+ struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_set_immutable() - set an immutable trigger on destination
+ *
+ * @indio_dev: IIO device structure containing the device
+ * @trig: trigger to assign to device
+ *
+ **/
+int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
+
+/**
+ * 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);
+
+/**
+ * iio_trigger_using_own() - tells us if we use our own HW trigger ourselves
+ * @indio_dev: device to check
+ */
+bool iio_trigger_using_own(struct iio_dev *indio_dev);
+
+int iio_trigger_validate_own_device(struct iio_trigger *trig,
+ struct iio_dev *indio_dev);
+
+#else
+struct iio_trigger;
+struct iio_trigger_ops;
+#endif
+#endif /* _IIO_TRIGGER_H_ */