1637db4441
Add general registration support for IIO triggers. These are currently only used to initialize a 'poll' of a given device. Examples include the lis3l02dq's data ready signal being used to initialize a read and gpio triggers being used to allow externally synchronized sensor reading. Each trigger can cause any number of 'consumer' devices to be polled with each storing data into a related ring buffer. Two stage triggering is supported with 'fast' and 'slow' paths. The first is used for things like pulling a data hold line high and the second for actual read which may take far longer. Changes since V2: * As with IIO triggers now use a registration approach much closer to that of input leading to cleaner code. Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/* The industrial I/O core, trigger handling functions
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef _IIO_TRIGGER_H_
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#define _IIO_TRIGGER_H_
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#define IIO_TRIGGER_NAME_LENGTH 20
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#define IIO_TRIGGER_ID_PREFIX "iio:trigger"
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#define IIO_TRIGGER_ID_FORMAT IIO_TRIGGER_ID_PREFIX "%d"
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/**
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* struct iio_trigger - industrial I/O trigger device
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*
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* @id: [INTERN] unique id number
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* @name: [DRIVER] unique name
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* @dev: [DRIVER] associated device (if relevant)
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* @sysfs_dev: [INTERN] sysfs relevant device
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* @private_data: [DRIVER] device specific data
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* @list: [INTERN] used in maintenance of global trigger list
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* @alloc_list: [DRIVER] used for driver specific trigger list
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* @poll_func_list_lock:[INTERN] protection of the polling function list
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* @pollfunc_list: [INTERN] list of functions to run on trigger.
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* @control_attrs: [DRIVER] sysfs attributes relevant to trigger type
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* @set_trigger_state: [DRIVER] switch on/off the trigger on demand
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* @timestamp: [INTERN] timestamp usesd by some trigs (e.g. datardy)
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* @owner: [DRIVER] used to monitor usage count of the trigger.
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**/
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struct iio_trigger {
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int id;
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const char *name;
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struct device dev;
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void *private_data;
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struct list_head list;
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struct list_head alloc_list;
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spinlock_t pollfunc_list_lock;
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struct list_head pollfunc_list;
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const struct attribute_group *control_attrs;
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s64 timestamp;
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struct module *owner;
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int use_count;
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int (*set_trigger_state)(struct iio_trigger *trig, bool state);
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int (*try_reenable)(struct iio_trigger *trig);
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};
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static inline struct iio_trigger *to_iio_trigger(struct device *d)
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{
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return container_of(d, struct iio_trigger, dev);
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};
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static inline void iio_put_trigger(struct iio_trigger *trig)
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{
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put_device(&trig->dev);
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module_put(trig->owner);
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};
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static inline void iio_get_trigger(struct iio_trigger *trig)
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{
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__module_get(trig->owner);
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get_device(&trig->dev);
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};
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/**
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* iio_trigger_read_name() - sysfs access function to get the trigger name
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**/
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ssize_t iio_trigger_read_name(struct device *dev,
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struct device_attribute *attr,
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char *buf);
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#define IIO_TRIGGER_NAME_ATTR DEVICE_ATTR(name, S_IRUGO, \
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iio_trigger_read_name, \
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NULL);
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/**
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* iio_trigger_find_by_name() - search global trigger list
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**/
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struct iio_trigger *iio_trigger_find_by_name(const char *name, size_t len);
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/**
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* iio_trigger_register() - register a trigger with the IIO core
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* @trig_info: trigger to be registered
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**/
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int iio_trigger_register(struct iio_trigger *trig_info);
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/**
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* iio_trigger_unregister() - unregister a trigger from the core
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**/
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void iio_trigger_unregister(struct iio_trigger *trig_info);
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/**
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* iio_trigger_attach_poll_func() - add a function pair to be run on trigger
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* @trig: trigger to which the function pair are being added
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* @pf: poll function pair
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**/
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int iio_trigger_attach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf);
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/**
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* iio_trigger_dettach_poll_func() - remove function pair from those to be
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* run on trigger.
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* @trig: trigger from which the function is being removed.
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* @pf: poll function pair
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**/
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int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf);
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/**
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* iio_trigger_poll() - called on a trigger occuring
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* Typically called in relevant hardware interrupt handler.
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**/
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void iio_trigger_poll(struct iio_trigger *);
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void iio_trigger_notify_done(struct iio_trigger *);
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/**
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* struct iio_poll_func - poll function pair
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*
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* @list: associate this with a triggers pollfunc_list
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* @private_data: data specific to device (passed into poll func)
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* @poll_func_immediate: function in here is run first. They should be
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* extremely lightweight. Typically used for latch
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* control on sensor supporting it.
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* @poll_func_main: function in here is run after all immediates.
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* Reading from sensor etc typically involves
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* scheduling
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* from here.
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*
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* The two stage approach used here only important when multiple sensors are
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* being triggered by a single trigger. This really comes into it's own with
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* simultaneous sampling devices where a simple latch command can be used to
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* make the device store the values on all inputs.
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**/
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struct iio_poll_func {
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struct list_head list;
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void *private_data;
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void (*poll_func_immediate)(struct iio_dev *indio_dev);
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void (*poll_func_main)(struct iio_dev *private_data);
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};
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struct iio_trigger *iio_allocate_trigger(void);
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void iio_free_trigger(struct iio_trigger *trig);
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#endif /* _IIO_TRIGGER_H_ */
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