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Staging: IIO: core support for device registration and management

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Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron 2009-08-18 18:06:19 +01:00 committed by Greg Kroah-Hartman
parent a5ca2dfc4e
commit 847ec80bba
9 changed files with 1719 additions and 0 deletions
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2
drivers/staging/Kconfig
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@ -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

1
drivers/staging/Makefile
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@ -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/

11
drivers/staging/iio/Kconfig Normal file
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@ -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.

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

118
drivers/staging/iio/chrdev.h Normal file
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@ -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

411
drivers/staging/iio/iio.h Normal file
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@ -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_ */

851
drivers/staging/iio/industrialio-core.c Normal file
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@ -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");

293
drivers/staging/iio/sysfs.h Normal file
View File

@ -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_ */

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drivers/staging/iio/trigger_consumer.h Normal file
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/* 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;
};