Staging: IIO: core support for device registration and management
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d08cd8d..4d836a0 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -137,5 +137,7 @@
source "drivers/staging/sep/Kconfig"
+source "drivers/staging/iio/Kconfig"
+
endif # !STAGING_EXCLUDE_BUILD
endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 9a23438..f0c33ee 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -50,3 +50,4 @@
obj-$(CONFIG_VME_BUS) += vme/
obj-$(CONFIG_RAR_REGISTER) += rar/
obj-$(CONFIG_DX_SEP) += sep/
+obj-$(CONFIG_IIO) += iio/
diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig
new file mode 100644
index 0000000..09e4101
--- /dev/null
+++ b/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.
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
new file mode 100644
index 0000000..92b462a
--- /dev/null
+++ b/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
diff --git a/drivers/staging/iio/chrdev.h b/drivers/staging/iio/chrdev.h
new file mode 100644
index 0000000..8bc64bf
--- /dev/null
+++ b/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
diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
new file mode 100644
index 0000000..25ccb80
--- /dev/null
+++ b/drivers/staging/iio/iio.h
@@ -0,0 +1,411 @@
+/* The industrial I/O core
+ *
+ * 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 _INDUSTRIAL_IO_H_
+#define _INDUSTRIAL_IO_H_
+
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include "sysfs.h"
+#include "chrdev.h"
+
+/* IIO TODO LIST */
+/* Static device specific elements (conversion factors etc)
+ * should be exported via sysfs
+ *
+ * Provide means of adjusting timer accuracy.
+ * Currently assumes nano seconds.
+ */
+
+/* Event interface flags */
+#define IIO_BUSY_BIT_POS 1
+
+struct iio_dev;
+
+/**
+ * iio_get_time_ns() - utility function to get a time stamp for events etc
+ **/
+static inline s64 iio_get_time_ns(void)
+{
+ struct timespec ts;
+ /*
+ * calls getnstimeofday.
+ * If hrtimers then up to ns accurate, if not microsecond.
+ */
+ ktime_get_real_ts(&ts);
+
+ return timespec_to_ns(&ts);
+}
+
+/**
+ * iio_add_event_to_list() - Wraps adding to event lists
+ * @el: the list element of the event to be handled.
+ * @head: the list associated with the event handler being used.
+ *
+ * Does reference counting to allow shared handlers.
+ **/
+void iio_add_event_to_list(struct iio_event_handler_list *el,
+ struct list_head *head);
+
+/**
+ * iio_remove_event_from_list() - Wraps removing from event list
+ * @el: element to be removed
+ * @head: associate list head for the interrupt handler.
+ *
+ * Does reference counting to allow shared handlers.
+ **/
+void iio_remove_event_from_list(struct iio_event_handler_list *el,
+ struct list_head *head);
+
+/* Device operating modes */
+#define INDIO_DIRECT_MODE 0x01
+#define INDIO_RING_TRIGGERED 0x02
+#define INDIO_RING_HARDWARE_BUFFER 0x08
+
+#define INDIO_ALL_RING_MODES (INDIO_RING_TRIGGERED | INDIO_RING_HARDWARE_BUFFER)
+
+/* Vast majority of this is set by the industrialio subsystem on a
+ * call to iio_device_register. */
+
+/**
+ * struct iio_dev - industrial I/O device
+ * @id: [INTERN] used to identify device internally
+ * @dev_data: [DRIVER] device specific data
+ * @modes: [DRIVER] operating modes supported by device
+ * @currentmode: [DRIVER] current operating mode
+ * @dev: [DRIVER] device structure, should be assigned a parent
+ * and owner
+ * @attrs: [DRIVER] general purpose device attributes
+ * @driver_module: [DRIVER] module structure used to ensure correct
+ * ownership of chrdevs etc
+ * @num_interrupt_lines:[DRIVER] number of physical interrupt lines from device
+ * @interrupts: [INTERN] interrupt line specific event lists etc
+ * @event_attrs: [DRIVER] event control attributes
+ * @event_conf_attrs: [DRIVER] event configuration attributes
+ * @event_interfaces: [INTERN] event chrdevs associated with interrupt lines
+ * @ring: [DRIVER] any ring buffer present
+ * @mlock: [INTERN] lock used to prevent simultaneous device state
+ * changes
+ * @scan_el_attrs: [DRIVER] control of scan elements if that scan mode
+ * control method is used
+ * @scan_count: [INTERN] the number of elements in the current scan mode
+ * @scan_mask: [INTERN] bitmask used in masking scan mode elements
+ * @scan_timestamp: [INTERN] does the scan mode include a timestamp
+ * @trig: [INTERN] current device trigger (ring buffer modes)
+ * @pollfunc: [DRIVER] function run on trigger being recieved
+ **/
+struct iio_dev {
+ int id;
+ void *dev_data;
+ int modes;
+ int currentmode;
+ struct device dev;
+ const struct attribute_group *attrs;
+ struct module *driver_module;
+
+ int num_interrupt_lines;
+ struct iio_interrupt **interrupts;
+ struct attribute_group *event_attrs;
+ struct attribute_group *event_conf_attrs;
+
+ struct iio_event_interface *event_interfaces;
+
+ struct iio_ring_buffer *ring;
+ struct mutex mlock;
+
+ struct attribute_group *scan_el_attrs;
+ int scan_count;
+
+ u16 scan_mask;
+ bool scan_timestamp;
+ struct iio_trigger *trig;
+ struct iio_poll_func *pollfunc;
+};
+
+/*
+ * These are mainly provided to allow for a change of implementation if a device
+ * has a large number of scan elements
+ */
+#define IIO_MAX_SCAN_LENGTH 15
+
+static inline int iio_scan_mask_query(struct iio_dev *dev_info, int bit)
+{
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ else
+ return !!(dev_info->scan_mask & (1 << bit));
+};
+
+static inline int iio_scan_mask_set(struct iio_dev *dev_info, int bit)
+{
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ dev_info->scan_mask |= (1 << bit);
+ dev_info->scan_count++;
+ return 0;
+};
+
+static inline int iio_scan_mask_clear(struct iio_dev *dev_info, int bit)
+{
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ dev_info->scan_mask &= ~(1 << bit);
+ dev_info->scan_count--;
+ return 0;
+};
+
+/**
+ * iio_scan_mask_count_to_right() - how many scan elements occur before here
+ * @dev_info: the iio_device whose scan mode we are querying
+ * @bit: which number scan element is this
+ **/
+static inline int iio_scan_mask_count_to_right(struct iio_dev *dev_info,
+int bit)
+{
+ int count = 0;
+ int mask = (1 << bit);
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ while (mask) {
+ mask >>= 1;
+ if (mask & dev_info->scan_mask)
+ count++;
+ }
+
+ return count;
+}
+
+/**
+ * iio_device_register() - register a device with the IIO subsystem
+ * @dev_info: Device structure filled by the device driver
+ **/
+int iio_device_register(struct iio_dev *dev_info);
+
+/**
+ * iio_device_unregister() - unregister a device from the IIO subsystem
+ * @dev_info: Device structure representing the device.
+ **/
+void iio_device_unregister(struct iio_dev *dev_info);
+
+/**
+ * struct iio_interrupt - wrapper used to allow easy handling of multiple
+ * physical interrupt lines
+ * @dev_info: the iio device for which the is an interrupt line
+ * @line_number: associated line number
+ * @id: idr allocated unique id number
+ * @irq: associate interrupt number
+ * @ev_list: event handler list for associated events
+ * @ev_list_lock: ensure only one access to list at a time
+ **/
+struct iio_interrupt {
+ struct iio_dev *dev_info;
+ int line_number;
+ int id;
+ int irq;
+ struct list_head ev_list;
+ spinlock_t ev_list_lock;
+};
+
+#define to_iio_interrupt(i) container_of(i, struct iio_interrupt, ev_list)
+
+/**
+ * iio_register_interrupt_line() - Tell IIO about interrupt lines
+ *
+ * @irq: Typically provided via platform data
+ * @dev_info: IIO device info structure for device
+ * @line_number: Which interrupt line of the device is this?
+ * @type: Interrupt type (e.g. edge triggered etc)
+ * @name: Identifying name.
+ **/
+int iio_register_interrupt_line(unsigned int irq,
+ struct iio_dev *dev_info,
+ int line_number,
+ unsigned long type,
+ const char *name);
+
+void iio_unregister_interrupt_line(struct iio_dev *dev_info,
+ int line_number);
+
+
+
+/**
+ * iio_push_event() - try to add event to the list for userspace reading
+ * @dev_info: IIO device structure
+ * @ev_line: Which event line (hardware interrupt)
+ * @ev_code: What event
+ * @timestamp: When the event occured
+ **/
+int iio_push_event(struct iio_dev *dev_info,
+ int ev_line,
+ int ev_code,
+ s64 timestamp);
+
+/**
+ * struct iio_work_cont - container for when singleton handler case matters
+ * @ws: [DEVICE]work_struct when not only possible event
+ * @ws_nocheck: [DEVICE]work_struct when only possible event
+ * @address: [DEVICE]associated register address
+ * @mask: [DEVICE]associated mask for identifying event source
+ * @st: [DEVICE]device specific state information
+ **/
+struct iio_work_cont {
+ struct work_struct ws;
+ struct work_struct ws_nocheck;
+ int address;
+ int mask;
+ void *st;
+};
+
+#define to_iio_work_cont_check(_ws) \
+ container_of(_ws, struct iio_work_cont, ws)
+
+#define to_iio_work_cont_no_check(_ws) \
+ container_of(_ws, struct iio_work_cont, ws_nocheck)
+
+/**
+ * iio_init_work_cont() - intiialize the elements of a work container
+ * @cont: the work container
+ * @_checkfunc: function called when there are multiple possible int sources
+ * @_nocheckfunc: function for when there is only one int source
+ * @_add: driver dependant, typically a register address
+ * @_mask: driver dependant, typically a bit mask for a register
+ * @_st: driver dependant, typically pointer to a device state structure
+ **/
+static inline void
+iio_init_work_cont(struct iio_work_cont *cont,
+ void (*_checkfunc)(struct work_struct *),
+ void (*_nocheckfunc)(struct work_struct *),
+ int _add, int _mask, void *_st)
+{
+ INIT_WORK(&(cont)->ws, _checkfunc);
+ INIT_WORK(&(cont)->ws_nocheck, _nocheckfunc);
+ cont->address = _add;
+ cont->mask = _mask;
+ cont->st = _st;
+}
+/**
+ * __iio_push_event() tries to add an event to the list associated with a chrdev
+ * @ev_int: the event interface to which we are pushing the event
+ * @ev_code: the outgoing event code
+ * @timestamp: timestamp of the event
+ * @shared_pointer_p: the shared event pointer
+ **/
+int __iio_push_event(struct iio_event_interface *ev_int,
+ int ev_code,
+ s64 timestamp,
+ struct iio_shared_ev_pointer*
+ shared_pointer_p);
+/**
+ * __iio_change_event() change an event code in case of event escallation
+ * @ev: the evnet to be changed
+ * @ev_code: new event code
+ * @timestamp: new timestamp
+ **/
+void __iio_change_event(struct iio_detected_event_list *ev,
+ int ev_code,
+ s64 timestamp);
+
+/**
+ * iio_setup_ev_int() Configure an event interface (chrdev)
+ * @name: name used for resulting sysfs directory etc.
+ * @ev_int: interface we are configuring
+ * @owner: module that is responsible for registering this ev_int
+ * @dev: device whose ev_int this is
+ **/
+int iio_setup_ev_int(struct iio_event_interface *ev_int,
+ const char *name,
+ struct module *owner,
+ struct device *dev);
+
+void iio_free_ev_int(struct iio_event_interface *ev_int);
+
+/**
+ * iio_allocate_chrdev() - Allocate a chrdev
+ * @handler: struct that contains relevant file handling for chrdev
+ * @dev_info: iio_dev for which chrdev is being created
+ **/
+int iio_allocate_chrdev(struct iio_handler *handler, struct iio_dev *dev_info);
+void iio_deallocate_chrdev(struct iio_handler *handler);
+
+/* Used to distinguish between bipolar and unipolar scan elemenents.
+ * Whilst this may seem obvious, we may well want to change the representation
+ * in the future!*/
+#define IIO_SIGNED(a) -(a)
+#define IIO_UNSIGNED(a) (a)
+
+extern dev_t iio_devt;
+extern struct class iio_class;
+
+/**
+ * iio_put_device() - reference counted deallocated of struct device
+ * @dev: the iio_device containing the device
+ **/
+static inline void iio_put_device(struct iio_dev *dev)
+{
+ if (dev)
+ put_device(&dev->dev);
+};
+
+/**
+ * to_iio_dev() - get iio_dev for which we have have the struct device
+ * @d: the struct device
+ **/
+static inline struct iio_dev *to_iio_dev(struct device *d)
+{
+ return container_of(d, struct iio_dev, dev);
+};
+
+/**
+ * iio_dev_get_devdata() - helper function gets device specific data
+ * @d: the iio_dev associated with the device
+ **/
+static inline void *iio_dev_get_devdata(struct iio_dev *d)
+{
+ return d->dev_data;
+}
+
+/**
+ * iio_allocate_device() - allocate an iio_dev from a driver
+ **/
+struct iio_dev *iio_allocate_device(void);
+
+/**
+ * iio_free_device() - free an iio_dev from a driver
+ **/
+void iio_free_device(struct iio_dev *dev);
+
+/**
+ * iio_put() - internal module reference count reduce
+ **/
+void iio_put(void);
+
+/**
+ * iio_get() - internal module reference count increase
+ **/
+void iio_get(void);
+
+/* Ring buffer related */
+int iio_device_get_chrdev_minor(void);
+void iio_device_free_chrdev_minor(int val);
+
+/**
+ * iio_ring_enabled() helper function to test if any form of ring enabled
+ **/
+static inline bool iio_ring_enabled(struct iio_dev *dev_info)
+{
+ return dev_info->currentmode
+ & (INDIO_RING_TRIGGERED
+ | INDIO_RING_HARDWARE_BUFFER);
+};
+
+struct idr;
+
+int iio_get_new_idr_val(struct idr *this_idr);
+void iio_free_idr_val(struct idr *this_idr, int id);
+#endif /* _INDUSTRIAL_IO_H_ */
diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
new file mode 100644
index 0000000..660a9c1
--- /dev/null
+++ b/drivers/staging/iio/industrialio-core.c
@@ -0,0 +1,851 @@
+/* The industrial I/O core
+ *
+ * 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.
+ *
+ * Based on elements of hwmon and input subsystems.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/idr.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/cdev.h>
+#include "iio.h"
+#include "trigger_consumer.h"
+
+#define IIO_ID_PREFIX "device"
+#define IIO_ID_FORMAT IIO_ID_PREFIX "%d"
+
+/* IDR to assign each registered device a unique id*/
+static DEFINE_IDR(iio_idr);
+
+/* IDR for general event identifiers */
+static DEFINE_IDR(iio_event_idr);
+/* IDR to allocate character device minor numbers */
+static DEFINE_IDR(iio_chrdev_idr);
+/* Lock used to protect both of the above */
+static DEFINE_SPINLOCK(iio_idr_lock);
+
+dev_t iio_devt;
+EXPORT_SYMBOL(iio_devt);
+
+#define IIO_DEV_MAX 256
+static char *iio_nodename(struct device *dev)
+{
+ return kasprintf(GFP_KERNEL, "iio/%s", dev_name(dev));
+}
+
+struct class iio_class = {
+ .name = "iio",
+ .nodename = iio_nodename,
+};
+EXPORT_SYMBOL(iio_class);
+
+void __iio_change_event(struct iio_detected_event_list *ev,
+ int ev_code,
+ s64 timestamp)
+{
+ ev->ev.id = ev_code;
+ ev->ev.timestamp = timestamp;
+}
+EXPORT_SYMBOL(__iio_change_event);
+
+/* Used both in the interrupt line put events and the ring buffer ones */
+
+/* Note that in it's current form someone has to be listening before events
+ * are queued. Hence a client MUST open the chrdev before the ring buffer is
+ * switched on.
+ */
+ int __iio_push_event(struct iio_event_interface *ev_int,
+ int ev_code,
+ s64 timestamp,
+ struct iio_shared_ev_pointer *
+ shared_pointer_p)
+{
+ struct iio_detected_event_list *ev;
+ int ret = 0;
+
+ /* Does anyone care? */
+ mutex_lock(&ev_int->event_list_lock);
+ if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) {
+ if (ev_int->current_events == ev_int->max_events)
+ return 0;
+ ev = kmalloc(sizeof(*ev), GFP_KERNEL);
+ if (ev == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ev->ev.id = ev_code;
+ ev->ev.timestamp = timestamp;
+ ev->shared_pointer = shared_pointer_p;
+ if (ev->shared_pointer)
+ shared_pointer_p->ev_p = ev;
+
+ list_add_tail(&ev->list, &ev_int->det_events.list);
+ ev_int->current_events++;
+ mutex_unlock(&ev_int->event_list_lock);
+ wake_up_interruptible(&ev_int->wait);
+ } else
+ mutex_unlock(&ev_int->event_list_lock);
+
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(__iio_push_event);
+
+int iio_push_event(struct iio_dev *dev_info,
+ int ev_line,
+ int ev_code,
+ s64 timestamp)
+{
+ return __iio_push_event(&dev_info->event_interfaces[ev_line],
+ ev_code, timestamp, NULL);
+}
+EXPORT_SYMBOL(iio_push_event);
+
+/* Generic interrupt line interrupt handler */
+irqreturn_t iio_interrupt_handler(int irq, void *_int_info)
+{
+ struct iio_interrupt *int_info = _int_info;
+ struct iio_dev *dev_info = int_info->dev_info;
+ struct iio_event_handler_list *p;
+ s64 time_ns;
+ unsigned long flags;
+
+ spin_lock_irqsave(&int_info->ev_list_lock, flags);
+ if (list_empty(&int_info->ev_list)) {
+ spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
+ return IRQ_NONE;
+ }
+
+ time_ns = iio_get_time_ns();
+ /* detect single element list*/
+ if (list_is_singular(&int_info->ev_list)) {
+ disable_irq_nosync(irq);
+ p = list_first_entry(&int_info->ev_list,
+ struct iio_event_handler_list,
+ list);
+ /* single event handler - maybe shared */
+ p->handler(dev_info, 1, time_ns, !(p->refcount > 1));
+ } else
+ list_for_each_entry(p, &int_info->ev_list, list) {
+ disable_irq_nosync(irq);
+ p->handler(dev_info, 1, time_ns, 0);
+ }
+ spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static struct iio_interrupt *iio_allocate_interrupt(void)
+{
+ struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL);
+ if (i) {
+ spin_lock_init(&i->ev_list_lock);
+ INIT_LIST_HEAD(&i->ev_list);
+ }
+ return i;
+}
+
+/* Confirming the validity of supplied irq is left to drivers.*/
+int iio_register_interrupt_line(unsigned int irq,
+ struct iio_dev *dev_info,
+ int line_number,
+ unsigned long type,
+ const char *name)
+{
+ int ret;
+
+ dev_info->interrupts[line_number] = iio_allocate_interrupt();
+ if (dev_info->interrupts[line_number] == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ dev_info->interrupts[line_number]->line_number = line_number;
+ dev_info->interrupts[line_number]->irq = irq;
+ dev_info->interrupts[line_number]->dev_info = dev_info;
+
+ /* Possibly only request on demand?
+ * Can see this may complicate the handling of interrupts.
+ * However, with this approach we might end up handling lots of
+ * events no-one cares about.*/
+ ret = request_irq(irq,
+ &iio_interrupt_handler,
+ type,
+ name,
+ dev_info->interrupts[line_number]);
+
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(iio_register_interrupt_line);
+
+/* This turns up an awful lot */
+ssize_t iio_read_const_attr(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
+}
+EXPORT_SYMBOL(iio_read_const_attr);
+
+/* Before this runs the interrupt generator must have been disabled */
+void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number)
+{
+ /* make sure the interrupt handlers are all done */
+ flush_scheduled_work();
+ free_irq(dev_info->interrupts[line_number]->irq,
+ dev_info->interrupts[line_number]);
+ kfree(dev_info->interrupts[line_number]);
+}
+EXPORT_SYMBOL(iio_unregister_interrupt_line);
+
+/* Reference counted add and remove */
+void iio_add_event_to_list(struct iio_event_handler_list *el,
+ struct list_head *head)
+{
+ unsigned long flags;
+ struct iio_interrupt *inter = to_iio_interrupt(head);
+
+ /* take mutex to protect this element */
+ mutex_lock(&el->exist_lock);
+ if (el->refcount == 0) {
+ /* Take the event list spin lock */
+ spin_lock_irqsave(&inter->ev_list_lock, flags);
+ list_add(&el->list, head);
+ spin_unlock_irqrestore(&inter->ev_list_lock, flags);
+ }
+ el->refcount++;
+ mutex_unlock(&el->exist_lock);
+}
+EXPORT_SYMBOL(iio_add_event_to_list);
+
+void iio_remove_event_from_list(struct iio_event_handler_list *el,
+ struct list_head *head)
+{
+ unsigned long flags;
+ struct iio_interrupt *inter = to_iio_interrupt(head);
+
+ mutex_lock(&el->exist_lock);
+ el->refcount--;
+ if (el->refcount == 0) {
+ /* Take the event list spin lock */
+ spin_lock_irqsave(&inter->ev_list_lock, flags);
+ list_del_init(&el->list);
+ spin_unlock_irqrestore(&inter->ev_list_lock, flags);
+ }
+ mutex_unlock(&el->exist_lock);
+}
+EXPORT_SYMBOL(iio_remove_event_from_list);
+
+ssize_t iio_event_chrdev_read(struct file *filep,
+ char *buf,
+ size_t count,
+ loff_t *f_ps)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+ struct iio_detected_event_list *el;
+ int ret;
+ size_t len;
+
+ mutex_lock(&ev_int->event_list_lock);
+ if (list_empty(&ev_int->det_events.list)) {
+ if (filep->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto error_mutex_unlock;
+ }
+ mutex_unlock(&ev_int->event_list_lock);
+ /* Blocking on device; waiting for something to be there */
+ ret = wait_event_interruptible(ev_int->wait,
+ !list_empty(&ev_int
+ ->det_events.list));
+ if (ret)
+ goto error_ret;
+ /* Single access device so noone else can get the data */
+ mutex_lock(&ev_int->event_list_lock);
+ }
+
+ el = list_first_entry(&ev_int->det_events.list,
+ struct iio_detected_event_list,
+ list);
+ len = sizeof el->ev;
+ if (copy_to_user(buf, &(el->ev), len)) {
+ ret = -EFAULT;
+ goto error_mutex_unlock;
+ }
+ list_del(&el->list);
+ ev_int->current_events--;
+ mutex_unlock(&ev_int->event_list_lock);
+ /*
+ * Possible concurency issue if an update of this event is on its way
+ * through. May lead to new even being removed whilst the reported event
+ * was the unescalated event. In typical use case this is not a problem
+ * as userspace will say read half the buffer due to a 50% full event
+ * which would make the correct 100% full incorrect anyway.
+ */
+ spin_lock(&el->shared_pointer->lock);
+ if (el->shared_pointer)
+ (el->shared_pointer->ev_p) = NULL;
+ spin_unlock(&el->shared_pointer->lock);
+
+ kfree(el);
+
+ return len;
+
+error_mutex_unlock:
+ mutex_unlock(&ev_int->event_list_lock);
+error_ret:
+
+ return ret;
+}
+
+int iio_event_chrdev_release(struct inode *inode, struct file *filep)
+{
+ struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
+ struct iio_event_interface *ev_int = hand->private;
+ struct iio_detected_event_list *el, *t;
+
+ mutex_lock(&ev_int->event_list_lock);
+ clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags);
+ /*
+ * In order to maintain a clean state for reopening,
+ * clear out any awaiting events. The mask will prevent
+ * any new __iio_push_event calls running.
+ */
+ list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) {
+ list_del(&el->list);
+ kfree(el);
+ }
+ mutex_unlock(&ev_int->event_list_lock);
+
+ return 0;
+}
+
+int iio_event_chrdev_open(struct inode *inode, struct file *filep)
+{
+ struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
+ struct iio_event_interface *ev_int = hand->private;
+
+ mutex_lock(&ev_int->event_list_lock);
+ if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) {
+ fops_put(filep->f_op);
+ mutex_unlock(&ev_int->event_list_lock);
+ return -EBUSY;
+ }
+ filep->private_data = hand->private;
+ mutex_unlock(&ev_int->event_list_lock);
+
+ return 0;
+}
+
+static const struct file_operations iio_event_chrdev_fileops = {
+ .read = iio_event_chrdev_read,
+ .release = iio_event_chrdev_release,
+ .open = iio_event_chrdev_open,
+ .owner = THIS_MODULE,
+};
+
+static void iio_event_dev_release(struct device *dev)
+{
+ struct iio_event_interface *ev_int
+ = container_of(dev, struct iio_event_interface, dev);
+ cdev_del(&ev_int->handler.chrdev);
+ iio_device_free_chrdev_minor(MINOR(dev->devt));
+};
+
+static struct device_type iio_event_type = {
+ .release = iio_event_dev_release,
+};
+
+int iio_device_get_chrdev_minor(void)
+{
+ int ret, val;
+
+idr_again:
+ if (unlikely(idr_pre_get(&iio_chrdev_idr, GFP_KERNEL) == 0))
+ return -ENOMEM;
+ spin_lock(&iio_idr_lock);
+ ret = idr_get_new(&iio_chrdev_idr, NULL, &val);
+ spin_unlock(&iio_idr_lock);
+ if (unlikely(ret == -EAGAIN))
+ goto idr_again;
+ else if (unlikely(ret))
+ return ret;
+ if (val > IIO_DEV_MAX)
+ return -ENOMEM;
+ return val;
+}
+
+void iio_device_free_chrdev_minor(int val)
+{
+ spin_lock(&iio_idr_lock);
+ idr_remove(&iio_chrdev_idr, val);
+ spin_unlock(&iio_idr_lock);
+}
+
+int iio_setup_ev_int(struct iio_event_interface *ev_int,
+ const char *name,
+ struct module *owner,
+ struct device *dev)
+{
+ int ret, minor;
+
+ ev_int->dev.class = &iio_class;
+ ev_int->dev.parent = dev;
+ ev_int->dev.type = &iio_event_type;
+ device_initialize(&ev_int->dev);
+
+ minor = iio_device_get_chrdev_minor();
+ if (minor < 0) {
+ ret = minor;
+ goto error_device_put;
+ }
+ ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor);
+ dev_set_name(&ev_int->dev, "%s", name);
+
+ ret = device_add(&ev_int->dev);
+ if (ret)
+ goto error_free_minor;
+
+ cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops);
+ ev_int->handler.chrdev.owner = owner;
+
+ mutex_init(&ev_int->event_list_lock);
+ /* discussion point - make this variable? */
+ ev_int->max_events = 10;
+ ev_int->current_events = 0;
+ INIT_LIST_HEAD(&ev_int->det_events.list);
+ init_waitqueue_head(&ev_int->wait);
+ ev_int->handler.private = ev_int;
+ ev_int->handler.flags = 0;
+
+ ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1);
+ if (ret)
+ goto error_unreg_device;
+
+ return 0;
+
+error_unreg_device:
+ device_unregister(&ev_int->dev);
+error_free_minor:
+ iio_device_free_chrdev_minor(minor);
+error_device_put:
+ put_device(&ev_int->dev);
+
+ return ret;
+}
+
+void iio_free_ev_int(struct iio_event_interface *ev_int)
+{
+ device_unregister(&ev_int->dev);
+ put_device(&ev_int->dev);
+}
+
+static int __init iio_dev_init(void)
+{
+ int err;
+
+ err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
+ if (err < 0)
+ printk(KERN_ERR "%s: failed to allocate char dev region\n",
+ __FILE__);
+
+ return err;
+}
+
+static void __exit iio_dev_exit(void)
+{
+ if (iio_devt)
+ unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
+}
+
+static int __init iio_init(void)
+{
+ int ret;
+
+ /* Create sysfs class */
+ ret = class_register(&iio_class);
+ if (ret < 0) {
+ printk(KERN_ERR
+ "%s could not create sysfs class\n",
+ __FILE__);
+ goto error_nothing;
+ }
+
+ ret = iio_dev_init();
+ if (ret < 0)
+ goto error_unregister_class;
+
+ return 0;
+
+error_unregister_class:
+ class_unregister(&iio_class);
+error_nothing:
+ return ret;
+}
+
+static void __exit iio_exit(void)
+{
+ iio_dev_exit();
+ class_unregister(&iio_class);
+}
+
+static int iio_device_register_sysfs(struct iio_dev *dev_info)
+{
+ int ret = 0;
+
+ ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs);
+ if (ret) {
+ dev_err(dev_info->dev.parent,
+ "Failed to register sysfs hooks\n");
+ goto error_ret;
+ }
+
+ if (dev_info->scan_el_attrs) {
+ ret = sysfs_create_group(&dev_info->dev.kobj,
+ dev_info->scan_el_attrs);
+ if (ret)
+ dev_err(&dev_info->dev,
+ "Failed to add sysfs scan els\n");
+ }
+
+error_ret:
+ return ret;
+}
+
+static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
+{
+ if (dev_info->scan_el_attrs)
+ sysfs_remove_group(&dev_info->dev.kobj,
+ dev_info->scan_el_attrs);
+
+ sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
+}
+
+int iio_get_new_idr_val(struct idr *this_idr)
+{
+ int ret;
+ int val;
+
+idr_again:
+ if (unlikely(idr_pre_get(this_idr, GFP_KERNEL) == 0))
+ return -ENOMEM;
+
+ spin_lock(&iio_idr_lock);
+ ret = idr_get_new(this_idr, NULL, &val);
+ spin_unlock(&iio_idr_lock);
+ if (unlikely(ret == -EAGAIN))
+ goto idr_again;
+ else if (unlikely(ret))
+ return ret;
+
+ return val;
+}
+EXPORT_SYMBOL(iio_get_new_idr_val);
+
+void iio_free_idr_val(struct idr *this_idr, int id)
+{
+ spin_lock(&iio_idr_lock);
+ idr_remove(this_idr, id);
+ spin_unlock(&iio_idr_lock);
+}
+EXPORT_SYMBOL(iio_free_idr_val);
+
+static int iio_device_register_id(struct iio_dev *dev_info,
+ struct idr *this_idr)
+{
+
+ dev_info->id = iio_get_new_idr_val(&iio_idr);
+ if (dev_info->id < 0)
+ return dev_info->id;
+ return 0;
+}
+
+static void iio_device_unregister_id(struct iio_dev *dev_info)
+{
+ iio_free_idr_val(&iio_idr, dev_info->id);
+}
+
+static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i)
+{
+ int ret;
+ /*p for adding, q for removing */
+ struct attribute **attrp, **attrq;
+
+ if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) {
+ attrp = dev_info->event_conf_attrs[i].attrs;
+ while (*attrp) {
+ ret = sysfs_add_file_to_group(&dev_info->dev.kobj,
+ *attrp,
+ dev_info
+ ->event_attrs[i].name);
+ if (ret)
+ goto error_ret;
+ attrp++;
+ }
+ }
+ return 0;
+
+error_ret:
+ attrq = dev_info->event_conf_attrs[i].attrs;
+ while (attrq != attrp) {
+ sysfs_remove_file_from_group(&dev_info->dev.kobj,
+ *attrq,
+ dev_info->event_attrs[i].name);
+ attrq++;
+ }
+
+ return ret;
+}
+
+static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info,
+ int i)
+{
+ struct attribute **attrq;
+
+ if (dev_info->event_conf_attrs
+ && dev_info->event_conf_attrs[i].attrs) {
+ attrq = dev_info->event_conf_attrs[i].attrs;
+ while (*attrq) {
+ sysfs_remove_file_from_group(&dev_info->dev.kobj,
+ *attrq,
+ dev_info
+ ->event_attrs[i].name);
+ attrq++;
+ }
+ }
+
+ return 0;
+}
+
+static int iio_device_register_eventset(struct iio_dev *dev_info)
+{
+ int ret = 0, i, j;
+
+ if (dev_info->num_interrupt_lines == 0)
+ return 0;
+
+ dev_info->event_interfaces =
+ kzalloc(sizeof(struct iio_event_interface)
+ *dev_info->num_interrupt_lines,
+ GFP_KERNEL);
+ if (dev_info->event_interfaces == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ dev_info->interrupts = kzalloc(sizeof(struct iio_interrupt *)
+ *dev_info->num_interrupt_lines,
+ GFP_KERNEL);
+ if (dev_info->interrupts == NULL) {
+ ret = -ENOMEM;
+ goto error_free_event_interfaces;
+ }
+
+ for (i = 0; i < dev_info->num_interrupt_lines; i++) {
+ dev_info->event_interfaces[i].owner = dev_info->driver_module;
+ ret = iio_get_new_idr_val(&iio_event_idr);
+ if (ret)
+ goto error_free_setup_ev_ints;
+ else
+ dev_info->event_interfaces[i].id = ret;
+
+ snprintf(dev_info->event_interfaces[i]._name, 20,
+ "event_line%d",
+ dev_info->event_interfaces[i].id);
+
+ ret = iio_setup_ev_int(&dev_info->event_interfaces[i],
+ (const char *)(dev_info
+ ->event_interfaces[i]
+ ._name),
+ dev_info->driver_module,
+ &dev_info->dev);
+ if (ret) {
+ dev_err(&dev_info->dev,
+ "Could not get chrdev interface\n");
+ iio_free_idr_val(&iio_event_idr,
+ dev_info->event_interfaces[i].id);
+ goto error_free_setup_ev_ints;
+ }
+ }
+
+ for (i = 0; i < dev_info->num_interrupt_lines; i++) {
+ snprintf(dev_info->event_interfaces[i]._attrname, 20,
+ "event_line%d_sources", i);
+ dev_info->event_attrs[i].name
+ = (const char *)
+ (dev_info->event_interfaces[i]._attrname);
+ ret = sysfs_create_group(&dev_info->dev.kobj,
+ &dev_info->event_attrs[i]);
+ if (ret) {
+ dev_err(&dev_info->dev,
+ "Failed to register sysfs for event attrs");
+ goto error_remove_sysfs_interfaces;
+ }
+ }
+
+ for (i = 0; i < dev_info->num_interrupt_lines; i++) {
+ ret = __iio_add_event_config_attrs(dev_info, i);
+ if (ret)
+ goto error_unregister_config_attrs;
+ }
+
+ return 0;
+
+error_unregister_config_attrs:
+ for (j = 0; j < i; j++)
+ __iio_remove_event_config_attrs(dev_info, i);
+ i = dev_info->num_interrupt_lines - 1;
+error_remove_sysfs_interfaces:
+ for (j = 0; j < i; j++)
+ sysfs_remove_group(&dev_info->dev.kobj,
+ &dev_info->event_attrs[j]);
+ i = dev_info->num_interrupt_lines - 1;
+error_free_setup_ev_ints:
+ for (j = 0; j < i; j++) {
+ iio_free_idr_val(&iio_event_idr,
+ dev_info->event_interfaces[i].id);
+ iio_free_ev_int(&dev_info->event_interfaces[j]);
+ }
+ kfree(dev_info->interrupts);
+error_free_event_interfaces:
+ kfree(dev_info->event_interfaces);
+error_ret:
+
+ return ret;
+}
+
+static void iio_device_unregister_eventset(struct iio_dev *dev_info)
+{
+ int i;
+
+ if (dev_info->num_interrupt_lines == 0)
+ return;
+ for (i = 0; i < dev_info->num_interrupt_lines; i++)
+ sysfs_remove_group(&dev_info->dev.kobj,
+ &dev_info->event_attrs[i]);
+
+ for (i = 0; i < dev_info->num_interrupt_lines; i++) {
+ iio_free_idr_val(&iio_event_idr,
+ dev_info->event_interfaces[i].id);
+ iio_free_ev_int(&dev_info->event_interfaces[i]);
+ }
+ kfree(dev_info->interrupts);
+ kfree(dev_info->event_interfaces);
+}
+
+static void iio_dev_release(struct device *device)
+{
+ struct iio_dev *dev = to_iio_dev(device);
+
+ iio_put();
+ kfree(dev);
+}
+
+static struct device_type iio_dev_type = {
+ .name = "iio_device",
+ .release = iio_dev_release,
+};
+
+struct iio_dev *iio_allocate_device(void)
+{
+ struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL);
+
+ if (dev) {
+ dev->dev.type = &iio_dev_type;
+ dev->dev.class = &iio_class;
+ device_initialize(&dev->dev);
+ dev_set_drvdata(&dev->dev, (void *)dev);
+ mutex_init(&dev->mlock);
+ iio_get();
+ }
+
+ return dev;
+}
+EXPORT_SYMBOL(iio_allocate_device);
+
+void iio_free_device(struct iio_dev *dev)
+{
+ if (dev)
+ iio_put_device(dev);
+}
+EXPORT_SYMBOL(iio_free_device);
+
+int iio_device_register(struct iio_dev *dev_info)
+{
+ int ret;
+
+ ret = iio_device_register_id(dev_info, &iio_idr);
+ if (ret) {
+ dev_err(&dev_info->dev, "Failed to get id\n");
+ goto error_ret;
+ }
+ dev_set_name(&dev_info->dev, "device%d", dev_info->id);
+
+ ret = device_add(&dev_info->dev);
+ if (ret)
+ goto error_free_idr;
+ ret = iio_device_register_sysfs(dev_info);
+ if (ret) {
+ dev_err(dev_info->dev.parent,
+ "Failed to register sysfs interfaces\n");
+ goto error_del_device;
+ }
+ ret = iio_device_register_eventset(dev_info);
+ if (ret) {
+ dev_err(dev_info->dev.parent,
+ "Failed to register event set \n");
+ goto error_free_sysfs;
+ }
+ if (dev_info->modes & INDIO_RING_TRIGGERED)
+ iio_device_register_trigger_consumer(dev_info);
+
+ return 0;
+
+error_free_sysfs:
+ iio_device_unregister_sysfs(dev_info);
+error_del_device:
+ device_del(&dev_info->dev);
+error_free_idr:
+ iio_device_unregister_id(dev_info);
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(iio_device_register);
+
+void iio_device_unregister(struct iio_dev *dev_info)
+{
+ if (dev_info->modes & INDIO_RING_TRIGGERED)
+ iio_device_unregister_trigger_consumer(dev_info);
+ iio_device_unregister_eventset(dev_info);
+ iio_device_unregister_sysfs(dev_info);
+ iio_device_unregister_id(dev_info);
+ device_unregister(&dev_info->dev);
+}
+EXPORT_SYMBOL(iio_device_unregister);
+
+void iio_put(void)
+{
+ module_put(THIS_MODULE);
+}
+
+void iio_get(void)
+{
+ __module_get(THIS_MODULE);
+}
+
+subsys_initcall(iio_init);
+module_exit(iio_exit);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
+MODULE_DESCRIPTION("Industrial I/O core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/staging/iio/sysfs.h b/drivers/staging/iio/sysfs.h
new file mode 100644
index 0000000..bfe4055
--- /dev/null
+++ b/drivers/staging/iio/sysfs.h
@@ -0,0 +1,293 @@
+/* The industrial I/O core
+ *
+ *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.
+ *
+ * General attributes
+ */
+
+#ifndef _INDUSTRIAL_IO_SYSFS_H_
+#define _INDUSTRIAL_IO_SYSFS_H_
+
+#include "iio.h"
+
+/**
+ * struct iio_event_attribute - event control attribute
+ * @dev_attr: underlying device attribute
+ * @mask: mask for the event when detecting
+ * @listel: list header to allow addition to list of event handlers
+*/
+struct iio_event_attr {
+ struct device_attribute dev_attr;
+ int mask;
+ struct iio_event_handler_list *listel;
+};
+
+#define to_iio_event_attr(_dev_attr) \
+ container_of(_dev_attr, struct iio_event_attr, dev_attr)
+
+/**
+ * struct iio_chrdev_minor_attr - simple attribute to allow reading of chrdev
+ * minor number
+ * @dev_attr: underlying device attribute
+ * @minor: the minor number
+ */
+struct iio_chrdev_minor_attr {
+ struct device_attribute dev_attr;
+ int minor;
+};
+
+void
+__init_iio_chrdev_minor_attr(struct iio_chrdev_minor_attr *minor_attr,
+ const char *name,
+ struct module *owner,
+ int id);
+
+
+#define to_iio_chrdev_minor_attr(_dev_attr) \
+ container_of(_dev_attr, struct iio_chrdev_minor_attr, dev_attr);
+
+/**
+ * struct iio_dev_attr - iio specific device attribute
+ * @dev_attr: underlying device attribute
+ * @address: associated register address
+ */
+struct iio_dev_attr {
+ struct device_attribute dev_attr;
+ int address;
+ int val2;
+};
+
+#define to_iio_dev_attr(_dev_attr) \
+ container_of(_dev_attr, struct iio_dev_attr, dev_attr)
+
+ssize_t iio_read_const_attr(struct device *dev,
+ struct device_attribute *attr,
+ char *len);
+
+/**
+ * struct iio_const_attr - constant device specific attribute
+ * often used for things like available modes
+ */
+struct iio_const_attr {
+ const char *string;
+ struct device_attribute dev_attr;
+};
+
+#define to_iio_const_attr(_dev_attr) \
+ container_of(_dev_attr, struct iio_const_attr, dev_attr)
+
+/* Some attributes will be hard coded (device dependant) and not require an
+ address, in these cases pass a negative */
+#define IIO_ATTR(_name, _mode, _show, _store, _addr) \
+ { .dev_attr = __ATTR(_name, _mode, _show, _store), \
+ .address = _addr }
+
+#define IIO_ATTR_2(_name, _mode, _show, _store, _addr, _val2) \
+ { .dev_attr = __ATTR(_name, _mode, _show, _store), \
+ .address = _addr, \
+ .val2 = _val2 }
+
+#define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr) \
+ struct iio_dev_attr iio_dev_attr_##_name \
+ = IIO_ATTR(_name, _mode, _show, _store, _addr)
+
+
+#define IIO_DEVICE_ATTR_2(_name, _mode, _show, _store, _addr, _val2) \
+ struct iio_dev_attr iio_dev_attr_##_name \
+ = IIO_ATTR_2(_name, _mode, _show, _store, _addr, _val2)
+
+#define IIO_CONST_ATTR(_name, _string) \
+ struct iio_const_attr iio_const_attr_##_name \
+ = { .string = _string, \
+ .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)}
+
+/* Generic attributes of onetype or another */
+
+/**
+ * IIO_DEV_ATTR_REG: revision number for the device
+ *
+ * Very much device dependent.
+ **/
+#define IIO_DEV_ATTR_REV(_show) \
+ IIO_DEVICE_ATTR(revision, S_IRUGO, _show, NULL, 0)
+/**
+ * IIO_DEV_ATTR_NAME: chip type dependant identifier
+ **/
+#define IIO_DEV_ATTR_NAME(_show) \
+ IIO_DEVICE_ATTR(name, S_IRUGO, _show, NULL, 0)
+
+/**
+ * IIO_DEV_ATTR_SAMP_FREQ: sets any internal clock frequency
+ **/
+#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_AVAIL_SAMP_FREQ: list available sampling frequencies.
+ *
+ * May be mode dependant on some devices
+ **/
+#define IIO_DEV_ATTR_AVAIL_SAMP_FREQ(_show) \
+ IIO_DEVICE_ATTR(available_sampling_frequency, S_IRUGO, _show, NULL, 0)
+
+/**
+ * IIO_DEV_ATTR_CONST_AVAIL_SAMP_FREQ: list available sampling frequencies.
+ *
+ * Constant version
+ **/
+#define IIO_CONST_ATTR_AVAIL_SAMP_FREQ(_string) \
+ IIO_CONST_ATTR(available_sampling_frequency, _string)
+/**
+ * IIO_DEV_ATTR_SCAN_MODE: select a scan mode
+ *
+ * This is used when only certain combinations of inputs may be read in one
+ * scan.
+ **/
+#define IIO_DEV_ATTR_SCAN_MODE(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(scan_mode, _mode, _show, _store, 0)
+/**
+ * IIO_DEV_ATTR_AVAIL_SCAN_MODES: list available scan modes
+ **/
+#define IIO_DEV_ATTR_AVAIL_SCAN_MODES(_show) \
+ IIO_DEVICE_ATTR(available_scan_modes, S_IRUGO, _show, NULL, 0)
+
+/**
+ * IIO_DEV_ATTR_SCAN: result of scan of multiple channels
+ **/
+#define IIO_DEV_ATTR_SCAN(_show) \
+ IIO_DEVICE_ATTR(scan, S_IRUGO, _show, NULL, 0);
+
+/**
+ * IIO_DEV_ATTR_INPUT: direct read of a single input channel
+ **/
+#define IIO_DEV_ATTR_INPUT(_number, _show) \
+ IIO_DEVICE_ATTR(in##_number, S_IRUGO, _show, NULL, _number)
+
+
+/**
+ * IIO_DEV_ATTR_SW_RING_ENABLE: enable software ring buffer
+ *
+ * Success may be dependant on attachment of trigger previously
+ **/
+#define IIO_DEV_ATTR_SW_RING_ENABLE(_show, _store) \
+ IIO_DEVICE_ATTR(sw_ring_enable, S_IRUGO | S_IWUSR, _show, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_HW_RING_ENABLE: enable hardware ring buffer
+ *
+ * This is a different attribute from the software one as one can invision
+ * schemes where a combination of the two may be used.
+ **/
+#define IIO_DEV_ATTR_HW_RING_ENABLE(_show, _store) \
+ IIO_DEVICE_ATTR(hw_ring_enable, S_IRUGO | S_IWUSR, _show, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_BPSE: set number of bits per scan element
+ **/
+#define IIO_DEV_ATTR_BPSE(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(bpse, _mode, _show, _store, 0)
+
+/**
+ * IIO_DEV_ATTR_BPSE_AVAILABLE: no of bits per scan element supported
+ **/
+#define IIO_DEV_ATTR_BPSE_AVAILABLE(_show) \
+ IIO_DEVICE_ATTR(bpse_available, S_IRUGO, _show, NULL, 0)
+
+/**
+ * IIO_DEV_ATTR_TEMP: many sensors have auxiliary temperature sensors
+ **/
+#define IIO_DEV_ATTR_TEMP(_show) \
+ IIO_DEVICE_ATTR(temp, S_IRUGO, _show, NULL, 0)
+/**
+ * IIO_EVENT_SH: generic shared event handler
+ *
+ * This is used in cases where more than one event may result from a single
+ * handler. Often the case that some alarm register must be read and multiple
+ * alarms may have been triggered.
+ **/
+#define IIO_EVENT_SH(_name, _handler) \
+ static struct iio_event_handler_list \
+ iio_event_##_name = { \
+ .handler = _handler, \
+ .refcount = 0, \
+ .exist_lock = __MUTEX_INITIALIZER(iio_event_##_name \
+ .exist_lock), \
+ .list = { \
+ .next = &iio_event_##_name.list, \
+ .prev = &iio_event_##_name.list, \
+ }, \
+ };
+/**
+ * IIO_EVENT_ATTR_SH: generic shared event attribute
+ *
+ * An attribute with an associated IIO_EVENT_SH
+ **/
+#define IIO_EVENT_ATTR_SH(_name, _ev_list, _show, _store, _mask) \
+ static struct iio_event_attr \
+ iio_event_attr_##_name \
+ = { .dev_attr = __ATTR(_name, S_IRUGO | S_IWUSR, \
+ _show, _store), \
+ .mask = _mask, \
+ .listel = &_ev_list };
+
+/**
+ * IIO_EVENT_ATTR: non shared event attribute
+ **/
+#define IIO_EVENT_ATTR(_name, _show, _store, _mask, _handler) \
+ static struct iio_event_handler_list \
+ iio_event_##_name = { \
+ .handler = _handler, \
+ }; \
+ static struct \
+ iio_event_attr \
+ iio_event_attr_##_name \
+ = { .dev_attr = __ATTR(_name, S_IRUGO | S_IWUSR, \
+ _show, _store), \
+ .mask = _mask, \
+ .listel = &iio_event_##_name }; \
+
+/**
+ * IIO_EVENT_ATTR_DATA_RDY: event driven by data ready signal
+ *
+ * Not typically implemented in devices where full triggering support
+ * has been implemented
+ **/
+#define IIO_EVENT_ATTR_DATA_RDY(_show, _store, _mask, _handler) \
+ IIO_EVENT_ATTR(data_rdy, _show, _store, _mask, _handler)
+
+#define IIO_EVENT_CODE_DATA_RDY 100
+#define IIO_EVENT_CODE_RING_BASE 200
+#define IIO_EVENT_CODE_ACCEL_BASE 300
+#define IIO_EVENT_CODE_GYRO_BASE 400
+#define IIO_EVENT_CODE_ADC_BASE 500
+#define IIO_EVENT_CODE_MISC_BASE 600
+
+#define IIO_EVENT_CODE_DEVICE_SPECIFIC 1000
+
+/**
+ * IIO_EVENT_ATTR_RING_50_FULL: ring buffer event to indicate 50% full
+ **/
+#define IIO_EVENT_ATTR_RING_50_FULL(_show, _store, _mask, _handler) \
+ IIO_EVENT_ATTR(ring_50_full, _show, _store, _mask, _handler)
+
+/**
+ * IIO_EVENT_ATTR_RING_50_FULL_SH: shared ring event to indicate 50% full
+ **/
+#define IIO_EVENT_ATTR_RING_50_FULL_SH(_evlist, _show, _store, _mask) \
+ IIO_EVENT_ATTR_SH(ring_50_full, _evlist, _show, _store, _mask)
+
+/**
+ * IIO_EVENT_ATTR_RING_75_FULL_SH: shared ring event to indicate 75% full
+ **/
+#define IIO_EVENT_ATTR_RING_75_FULL_SH(_evlist, _show, _store, _mask) \
+ IIO_EVENT_ATTR_SH(ring_75_full, _evlist, _show, _store, _mask)
+
+#define IIO_EVENT_CODE_RING_50_FULL IIO_EVENT_CODE_RING_BASE
+#define IIO_EVENT_CODE_RING_75_FULL (IIO_EVENT_CODE_RING_BASE + 1)
+#define IIO_EVENT_CODE_RING_100_FULL (IIO_EVENT_CODE_RING_BASE + 2)
+
+#endif /* _INDUSTRIAL_IO_SYSFS_H_ */
diff --git a/drivers/staging/iio/trigger_consumer.h b/drivers/staging/iio/trigger_consumer.h
new file mode 100644
index 0000000..a605389
--- /dev/null
+++ b/drivers/staging/iio/trigger_consumer.h
@@ -0,0 +1,26 @@
+
+/* The industrial I/O core, trigger consumer 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.
+ */
+
+/**
+ * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers.
+ * @dev_info: iio_dev associated with the device that will consume the trigger
+ **/
+int iio_device_register_trigger_consumer(struct iio_dev *dev_info)
+{
+ return 0;
+};
+/**
+ * iio_device_unregister_trigger_consumer() - reverse the registration process
+. * @dev_info: iio_dev associated with the device that consumed the trigger
+ **/
+int iio_device_unregister_trigger_consumer(struct iio_dev *dev_info)
+{
+ return 0;
+};
