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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>
#include <linux/atomic.h>

#ifndef _IIO_TRIGGER_H_
#define _IIO_TRIGGER_H_

#ifdef CONFIG_IIO_TRIGGER
struct iio_subirq {
	bool enabled;
};

struct iio_dev;
struct iio_trigger;

/**
 * struct iio_trigger_ops - operations structure for an iio_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 {
	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
 * @ops:		[DRIVER] operations structure
 * @id:			[INTERN] unique id number
 * @name:		[DRIVER] unique name
 * @dev:		[DRIVER] associated device (if relevant)
 * @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.
 * @attached_own_device:[INTERN] if we are using our own device as trigger,
 *			i.e. if we registered a poll function to the same
 *			device as the one providing the trigger.
 **/
struct iio_trigger {
	const struct iio_trigger_ops	*ops;
	struct module			*owner;
	int				id;
	const char			*name;
	struct device			dev;

	struct list_head		list;
	struct list_head		alloc_list;
	atomic_t			use_count;

	struct irq_chip			subirq_chip;
	int				subirq_base;

	struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
	unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)];
	struct mutex			pool_lock;
	bool				attached_own_device;
};


static inline struct iio_trigger *to_iio_trigger(struct device *d)
{
	return container_of(d, struct iio_trigger, dev);
}

static inline void iio_trigger_put(struct iio_trigger *trig)
{
	module_put(trig->owner);
	put_device(&trig->dev);
}

static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig)
{
	get_device(&trig->dev);
	__module_get(trig->owner);

	return trig;
}

/**
 * iio_device_set_drvdata() - Set trigger driver data
 * @trig: IIO trigger structure
 * @data: Driver specific data
 *
 * Allows to attach an arbitrary pointer to an IIO trigger, which can later be
 * retrieved by iio_trigger_get_drvdata().
 */
static inline void iio_trigger_set_drvdata(struct iio_trigger *trig, void *data)
{
	dev_set_drvdata(&trig->dev, data);
}

/**
 * iio_trigger_get_drvdata() - Get trigger driver data
 * @trig: IIO trigger structure
 *
 * Returns the data previously set with iio_trigger_set_drvdata()
 */
static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
{
	return dev_get_drvdata(&trig->dev);
}

/**
 * iio_trigger_register() - register a trigger with the IIO core
 * @trig_info:	trigger to be registered
 **/
#define iio_trigger_register(trig_info) \
	__iio_trigger_register((trig_info), THIS_MODULE)
int __iio_trigger_register(struct iio_trigger *trig_info,
			   struct module *this_mod);

#define devm_iio_trigger_register(dev, trig_info) \
	__devm_iio_trigger_register((dev), (trig_info), THIS_MODULE)
int __devm_iio_trigger_register(struct device *dev,
				struct iio_trigger *trig_info,
				struct module *this_mod);

/**
 * iio_trigger_unregister() - unregister a trigger from the core
 * @trig_info:	trigger to be unregistered
 **/
void iio_trigger_unregister(struct iio_trigger *trig_info);

void devm_iio_trigger_unregister(struct device *dev,
				 struct iio_trigger *trig_info);

/**
 * iio_trigger_set_immutable() - set an immutable trigger on destination
 *
 * @indio_dev: IIO device structure containing the device
 * @trig: trigger to assign to device
 *
 **/
int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);

/**
 * 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);
void iio_trigger_poll_chained(struct iio_trigger *trig);

irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);

__printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
void iio_trigger_free(struct iio_trigger *trig);

/**
 * iio_trigger_using_own() - tells us if we use our own HW trigger ourselves
 * @indio_dev:  device to check
 */
bool iio_trigger_using_own(struct iio_dev *indio_dev);

int iio_trigger_validate_own_device(struct iio_trigger *trig,
				     struct iio_dev *indio_dev);

#else
struct iio_trigger;
struct iio_trigger_ops;
#endif
#endif /* _IIO_TRIGGER_H_ */

Filemanager

Name Type Size Permission Actions
accel Folder 0755
adc Folder 0755
common Folder 0755
dac Folder 0755
frequency Folder 0755
gyro Folder 0755
imu Folder 0755
magnetometer Folder 0755
timer Folder 0755
buffer-dma.h File 4.56 KB 0644
buffer-dmaengine.h File 389 B 0644
buffer.h File 1.73 KB 0644
buffer_impl.h File 5.18 KB 0644
configfs.h File 405 B 0644
consumer.h File 12.08 KB 0644
driver.h File 832 B 0644
events.h File 2.24 KB 0644
iio.h File 27.09 KB 0644
kfifo_buf.h File 372 B 0644
machine.h File 998 B 0644
sw_device.h File 1.84 KB 0644
sw_trigger.h File 1.88 KB 0644
sysfs.h File 4.73 KB 0644
trigger.h File 5.3 KB 0644
trigger_consumer.h File 1.79 KB 0644
triggered_buffer.h File 781 B 0644
triggered_event.h File 352 B 0644
types.h File 873 B 0644