---

yaml
---
r: 162476
b: refs/heads/master
c: 847ec80
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a5ca2dfc4ebd33e18f981f562833c39efdc2585c
+refs/heads/master: 847ec80bbaa76aae41062d6802cea9c1b2289f14

trunk/drivers/staging/Kconfig

@@ -137,5 +137,7 @@ source "drivers/staging/rar/Kconfig"
 
 source "drivers/staging/sep/Kconfig"
 
+source "drivers/staging/iio/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING

trunk/drivers/staging/Makefile

@@ -50,3 +50,4 @@ obj-$(CONFIG_HYPERV)		+= hv/
 obj-$(CONFIG_VME_BUS)		+= vme/
 obj-$(CONFIG_RAR_REGISTER)	+= rar/
 obj-$(CONFIG_DX_SEP)		+= sep/
+obj-$(CONFIG_IIO)		+= iio/

trunk/drivers/staging/iio/Kconfig

@@ -0,0 +1,11 @@
+#
+# Industrial I/O subsytem configuration
+#
+
+menuconfig IIO
+	tristate "Industrial I/O support"
+	---help---
+	  The industrial I/O subsystem provides a unified framework for
+	  drivers for many different types of embedded sensors using a
+	  number of different physical interfaces (i2c, spi etc). See
+	  Documentation/industrialio for more information.

trunk/drivers/staging/iio/Makefile

@@ -0,0 +1,6 @@
+#
+# Makefile for the industrial I/O core.
+#
+
+obj-$(CONFIG_IIO) += industrialio.o
+industrialio-y := industrialio-core.o

trunk/drivers/staging/iio/chrdev.h

@@ -0,0 +1,118 @@
+/* The industrial I/O core - character device related
+ *
+ * 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.
+ */
+
+#ifndef _IIO_CHRDEV_H_
+#define _IIO_CHRDEV_H_
+struct iio_dev;
+
+/**
+ * struct iio_handler - Structure used to specify file operations
+ *			for a particular chrdev
+ * @chrdev:	character device structure
+ * @id:		the location in the handler table - used for deallocation.
+ * @flags:	file operations related flags including busy flag.
+ * @private:	handler specific data used by the fileops registered with
+ *		the chrdev.
+ */
+struct iio_handler {
+	struct cdev	chrdev;
+	int		id;
+	unsigned long	flags;
+	void		*private;
+};
+
+#define iio_cdev_to_handler(cd)				\
+	container_of(cd, struct iio_handler, chrdev)
+
+/**
+ * struct iio_event_data - The actual event being pushed to userspace
+ * @id:		event identifier
+ * @timestamp:	best estimate of time of event occurance (often from
+ *		the interrupt handler)
+ */
+struct iio_event_data {
+	int	id;
+	s64	timestamp;
+};
+
+/**
+ * struct iio_detected_event_list - list element for events that have occured
+ * @list:		linked list header
+ * @ev:			the event itself
+ * @shared_pointer:	used when the event is shared - i.e. can be escallated
+ *			on demand (eg ring buffer 50%->100% full)
+ */
+struct iio_detected_event_list {
+	struct list_head		list;
+	struct iio_event_data		ev;
+	struct iio_shared_ev_pointer	*shared_pointer;
+};
+/**
+ * struct iio_shared_ev_pointer - allows shared events to identify if currently
+ *				in the detected event list
+ * @ev_p:	pointer to detected event list element (null if not in list)
+ * @lock:	protect this element to prevent simultaneous edit and remove
+ */
+struct iio_shared_ev_pointer {
+	struct iio_detected_event_list	*ev_p;
+	spinlock_t			lock;
+};
+
+/**
+ * struct iio_event_interface - chrdev interface for an event line
+ * @dev:		device assocated with event interface
+ * @handler:		fileoperations and related control for the chrdev
+ * @wait:		wait queue to allow blocking reads of events
+ * @event_list_lock:	mutex to protect the list of detected events
+ * @det_events:		list of detected events
+ * @max_events:		maximum number of events before new ones are dropped
+ * @current_events:	number of events in detected list
+ * @id:			indentifier to allow the event interface to know which
+ *			physical line it corresponds to
+ * @owner:		ensure the driver module owns the file, not iio
+ * @private:		driver specific data
+ * @_name:		used internally to store the sysfs name for minor id
+ *			attribute
+ */
+struct iio_event_interface {
+	struct device				dev;
+	struct iio_handler			handler;
+	wait_queue_head_t			wait;
+	struct mutex				event_list_lock;
+	struct iio_detected_event_list		det_events;
+	int					max_events;
+	int					current_events;
+	int					id;
+	struct iio_chrdev_minor_attr		attr;
+	struct module				*owner;
+	void					*private;
+	char					_name[20];
+	char					_attrname[20];
+};
+
+/**
+ * struct iio_event_handler_list - element in list of handlers for events
+ * @list:		list header
+ * @refcount:		as the handler may be shared between multiple device
+ *			side events, reference counting ensures clean removal
+ * @exist_lock:		prevents race conditions related to refcount useage.
+ * @handler:		event handler function - called on event if this
+ *			event_handler is enabled.
+ *
+ * Each device has one list of these per interrupt line
+ **/
+struct iio_event_handler_list {
+	struct list_head	list;
+	int			refcount;
+	struct mutex		exist_lock;
+	int (*handler)(struct iio_dev *dev_info, int index, s64 timestamp,
+		       int no_test);
+};
+
+#endif