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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183/* 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_TRIGGERstruct 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);
void iio_trigger_poll(struct iio_trigger *trig);void iio_trigger_poll_nested(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_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig);int iio_trigger_validate_own_device(struct iio_trigger *trig, struct iio_dev *indio_dev);
#elsestruct iio_trigger;struct iio_trigger_ops;#endif#endif /* _IIO_TRIGGER_H_ */