Edit File: trigger.h
/* 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. * @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 * @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; 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->ops->owner); put_device(&trig->dev); } static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig) { get_device(&trig->dev); __module_get(trig->ops->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 **/ 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); void devm_iio_trigger_unregister(struct device *dev, 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); 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_ */