1 files changed, 119 insertions, 0 deletions

diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
new file mode 100644
index 000000000000..a9819940a84c
--- /dev/null
+++ b/include/linux/iio/trigger.h
@@ -0,0 +1,119 @@
+/* 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>
+
+#ifndef _IIO_TRIGGER_H_
+#define _IIO_TRIGGER_H_
+
+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
+ *
+ * @id:                 [INTERN] unique id number
+ * @name:               [DRIVER] unique name
+ * @dev:                [DRIVER] associated device (if relevant)
+ * @private_data:       [DRIVER] device specific data
+ * @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;
+
+        void                            *private_data;
+        struct list_head                list;
+        struct list_head                alloc_list;
+        int 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 void iio_trigger_get(struct iio_trigger *trig)
+{
+        get_device(&trig->dev);
+        __module_get(trig->ops->owner);
+};
+
+/**
+ * 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, s64 time);
+void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time);
+
+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);
+
+#endif /* _IIO_TRIGGER_H_ */