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/* SPDX-License-Identifier: GPL-2.0-only */
/* The industrial I/O core, trigger handling functions
*
* Copyright (c) 2008 Jonathan Cameron
*/
#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
* @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);
void (*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
* @owner: [INTERN] owner of this driver module
* @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: [INTERN] 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.
* @reenable_work: [INTERN] work item used to ensure reenable can sleep.
**/
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;
struct work_struct reenable_work;
};
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);
WARN_ONCE(list_empty(&trig->list),
"Getting non-registered iio trigger %s is prohibited\n",
trig->name);
__module_get(trig->owner);
return trig;
}
/**
* iio_trigger_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
**/
int iio_trigger_register(struct iio_trigger *trig_info);
int devm_iio_trigger_register(struct device *dev,
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_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);
#define iio_trigger_alloc(parent, fmt, ...) \
__iio_trigger_alloc((parent), THIS_MODULE, (fmt), ##__VA_ARGS__)
__printf(3, 4)
struct iio_trigger *__iio_trigger_alloc(struct device *parent,
struct module *this_mod,
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_ */
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