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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>
#ifndef _IIO_TRIGGER_H_
#define _IIO_TRIGGER_H_
struct iio_subirq {
bool enabled;
};
/**
* 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
* @owner: [DRIVER] used to monitor usage count of the trigger.
* @use_count: use count for the trigger
* @set_trigger_state: [DRIVER] 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.
* @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 {
int id;
const char *name;
struct device dev;
void *private_data;
struct list_head list;
struct list_head alloc_list;
struct module *owner;
int use_count;
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 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;
};
/**
* struct iio_poll_func - poll function pair
*
* @private_data: data specific to device (passed into poll func)
* @h: the function that is actually run on trigger
* @thread: threaded interrupt part
* @type: the type of interrupt (basically if oneshot)
* @name: name used to identify the trigger consumer.
* @irq: the corresponding irq as allocated from the
* trigger pool
* @timestamp: some devices need a timestamp grabbed as soon
* as possible after the trigger - hence handler
* passes it via here.
**/
struct iio_poll_func {
void *private_data;
irqreturn_t (*h)(int irq, void *p);
irqreturn_t (*thread)(int irq, void *p);
int type;
char *name;
int irq;
s64 timestamp;
};
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)
{
put_device(&trig->dev);
module_put(trig->owner);
};
static inline void iio_get_trigger(struct iio_trigger *trig)
{
__module_get(trig->owner);
get_device(&trig->dev);
};
/**
* 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_attach_poll_func() - add a function pair to be run on trigger
* @trig: trigger to which the function pair are being added
* @pf: poll function pair
**/
int iio_trigger_attach_poll_func(struct iio_trigger *trig,
struct iio_poll_func *pf);
/**
* iio_trigger_dettach_poll_func() - remove function pair from those to be
* run on trigger
* @trig: trigger from which the function is being removed
* @pf: poll function pair
**/
int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
struct iio_poll_func *pf);
/**
* 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);
void iio_trigger_notify_done(struct iio_trigger *trig);
irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
static inline int iio_trigger_get_irq(struct iio_trigger *trig)
{
int ret;
mutex_lock(&trig->pool_lock);
ret = bitmap_find_free_region(trig->pool,
CONFIG_IIO_CONSUMERS_PER_TRIGGER,
ilog2(1));
mutex_unlock(&trig->pool_lock);
if (ret >= 0)
ret += trig->subirq_base;
return ret;
};
static inline void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
{
mutex_lock(&trig->pool_lock);
clear_bit(irq - trig->subirq_base, trig->pool);
mutex_unlock(&trig->pool_lock);
};
struct iio_poll_func
*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
irqreturn_t (*thread)(int irq, void *p),
int type,
void *private,
const char *fmt,
...);
void iio_dealloc_pollfunc(struct iio_poll_func *pf);
irqreturn_t iio_pollfunc_store_time(int irq, void *p);
/*
* Two functions for common case where all that happens is a pollfunc
* is attached and detached from a trigger
*/
int iio_triggered_ring_postenable(struct iio_dev *indio_dev);
int iio_triggered_ring_predisable(struct iio_dev *indio_dev);
struct iio_trigger *iio_allocate_trigger(const char *fmt, ...)
__attribute__((format(printf, 1, 2)));
void iio_free_trigger(struct iio_trigger *trig);
#endif /* _IIO_TRIGGER_H_ */
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