| /* 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_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); |
| |
| __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); |
| |
| |
| #else |
| struct iio_trigger; |
| struct iio_trigger_ops; |
| #endif |
| #endif /* _IIO_TRIGGER_H_ */ |