1 files changed, 105 insertions, 0 deletions

diff --git a/include/linux/iio/events.h b/include/linux/iio/events.h
new file mode 100644
index 000000000000..b5acbf93c5da
--- /dev/null
+++ b/include/linux/iio/events.h
@@ -0,0 +1,105 @@
+/* The industrial I/O - event passing to userspace
+ *
+ * Copyright (c) 2008-2011 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.
+ */
+#ifndef _IIO_EVENTS_H_
+#define _IIO_EVENTS_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#include <linux/iio/types.h>
+
+/**
+ * struct iio_event_data - The actual event being pushed to userspace
+ * @id:         event identifier
+ * @timestamp:  best estimate of time of event occurrence (often from
+ *              the interrupt handler)
+ */
+struct iio_event_data {
+        __u64   id;
+        __s64   timestamp;
+};
+
+#define IIO_GET_EVENT_FD_IOCTL _IOR('i', 0x90, int)
+
+enum iio_event_type {
+        IIO_EV_TYPE_THRESH,
+        IIO_EV_TYPE_MAG,
+        IIO_EV_TYPE_ROC,
+        IIO_EV_TYPE_THRESH_ADAPTIVE,
+        IIO_EV_TYPE_MAG_ADAPTIVE,
+};
+
+enum iio_event_direction {
+        IIO_EV_DIR_EITHER,
+        IIO_EV_DIR_RISING,
+        IIO_EV_DIR_FALLING,
+};
+
+/**
+ * IIO_EVENT_CODE() - create event identifier
+ * @chan_type:  Type of the channel. Should be one of enum iio_chan_type.
+ * @diff:       Whether the event is for an differential channel or not.
+ * @modifier:   Modifier for the channel. Should be one of enum iio_modifier.
+ * @direction:  Direction of the event. One of enum iio_event_direction.
+ * @type:       Type of the event. Should be one enum iio_event_type.
+ * @chan:       Channel number for non-differential channels.
+ * @chan1:      First channel number for differential channels.
+ * @chan2:      Second channel number for differential channels.
+ */
+
+#define IIO_EVENT_CODE(chan_type, diff, modifier, direction,            \
+                       type, chan, chan1, chan2)                        \
+        (((u64)type << 56) | ((u64)diff << 55) |                        \
+         ((u64)direction << 48) | ((u64)modifier << 40) |               \
+         ((u64)chan_type << 32) | (((u16)chan2) << 16) | ((u16)chan1) | \
+         ((u16)chan))
+
+
+#define IIO_EV_DIR_MAX 4
+#define IIO_EV_BIT(type, direction)                     \
+        (1 << (type*IIO_EV_DIR_MAX + direction))
+
+/**
+ * IIO_MOD_EVENT_CODE() - create event identifier for modified channels
+ * @chan_type:  Type of the channel. Should be one of enum iio_chan_type.
+ * @number:     Channel number.
+ * @modifier:   Modifier for the channel. Should be one of enum iio_modifier.
+ * @type:       Type of the event. Should be one enum iio_event_type.
+ * @direction:  Direction of the event. One of enum iio_event_direction.
+ */
+
+#define IIO_MOD_EVENT_CODE(chan_type, number, modifier,         \
+                           type, direction)                             \
+        IIO_EVENT_CODE(chan_type, 0, modifier, direction, type, number, 0, 0)
+
+/**
+ * IIO_UNMOD_EVENT_CODE() - create event identifier for unmodified channels
+ * @chan_type:  Type of the channel. Should be one of enum iio_chan_type.
+ * @number:     Channel number.
+ * @type:       Type of the event. Should be one enum iio_event_type.
+ * @direction:  Direction of the event. One of enum iio_event_direction.
+ */
+
+#define IIO_UNMOD_EVENT_CODE(chan_type, number, type, direction)        \
+        IIO_EVENT_CODE(chan_type, 0, 0, direction, type, number, 0, 0)
+
+#define IIO_EVENT_CODE_EXTRACT_TYPE(mask) ((mask >> 56) & 0xFF)
+
+#define IIO_EVENT_CODE_EXTRACT_DIR(mask) ((mask >> 48) & 0xCF)
+
+#define IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(mask) ((mask >> 32) & 0xFF)
+
+/* Event code number extraction depends on which type of event we have.
+ * Perhaps review this function in the future*/
+#define IIO_EVENT_CODE_EXTRACT_CHAN(mask) ((__s16)(mask & 0xFFFF))
+#define IIO_EVENT_CODE_EXTRACT_CHAN2(mask) ((__s16)(((mask) >> 16) & 0xFFFF))
+
+#define IIO_EVENT_CODE_EXTRACT_MODIFIER(mask) ((mask >> 40) & 0xFF)
+#define IIO_EVENT_CODE_EXTRACT_DIFF(mask) (((mask) >> 55) & 0x1)
+
+#endif