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/* The industrial I/O core, trigger handling functions
* Copyright (c) 2008 Jonathan Cameron
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
#include <linux/irq.h>
#include <linux/module.h>
#ifndef _IIO_TRIGGER_H_
#define _IIO_TRIGGER_H_
struct iio_subirq {
bool enabled;
* struct iio_trigger_ops - operations structure for an iio_trigger.
* @owner: used to monitor usage count of the trigger.
* @set_trigger_state: switch on/off the trigger on demand
* @try_reenable: function to reenable the trigger when the
* use count is zero (may be NULL)
* @validate_device: function to validate the device when the
* current trigger gets changed.
* This is typically static const within a driver and shared by
* instances of a given device.
struct iio_trigger_ops {
struct module *owner;
int (*set_trigger_state)(struct iio_trigger *trig, bool state);
int (*try_reenable)(struct iio_trigger *trig);
int (*validate_device)(struct iio_trigger *trig,
struct iio_dev *indio_dev);
* struct iio_trigger - industrial I/O trigger device
* @id: [INTERN] unique id number
* @name: [DRIVER] unique name
* @dev: [DRIVER] associated device (if relevant)
* @private_data: [DRIVER] device specific data
* @list: [INTERN] used in maintenance of global trigger list
* @alloc_list: [DRIVER] used for driver specific trigger list
* @use_count: use count for the trigger
* @subirq_chip: [INTERN] associate 'virtual' irq chip.
* @subirq_base: [INTERN] base number for irqs provided by trigger.
* @subirqs: [INTERN] information about the 'child' irqs.
* @pool: [INTERN] bitmap of irqs currently in use.
* @pool_lock: [INTERN] protection of the irq pool.
struct iio_trigger {
const struct iio_trigger_ops *ops;
int id;
const char *name;
struct device dev;
void *private_data;
struct list_head list;
struct list_head alloc_list;
int use_count;
struct irq_chip subirq_chip;
int subirq_base;
struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
struct mutex pool_lock;
static inline struct iio_trigger *to_iio_trigger(struct device *d)
return container_of(d, struct iio_trigger, dev);
static inline void iio_put_trigger(struct iio_trigger *trig)
static inline void iio_get_trigger(struct iio_trigger *trig)
* iio_trigger_register() - register a trigger with the IIO core
* @trig_info: trigger to be registered
int iio_trigger_register(struct iio_trigger *trig_info);
* iio_trigger_unregister() - unregister a trigger from the core
* @trig_info: trigger to be unregistered
void iio_trigger_unregister(struct iio_trigger *trig_info);
* iio_trigger_poll() - called on a trigger occurring
* @trig: trigger which occurred
* Typically called in relevant hardware interrupt handler.
void iio_trigger_poll(struct iio_trigger *trig, s64 time);
void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time);
irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
__printf(1, 2) struct iio_trigger *iio_allocate_trigger(const char *fmt, ...);
void iio_free_trigger(struct iio_trigger *trig);
#endif /* _IIO_TRIGGER_H_ */