include/linux/iio/trigger.h

Source file repositories/reference/linux-study-clean/include/linux/iio/trigger.h

File Facts

System
Linux kernel
Corpus path
include/linux/iio/trigger.h
Extension
.h
Size
5295 bytes
Lines
183
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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;

Annotation

Implementation Notes