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187 lines
5.3 KiB
187 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* 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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#include <linux/irq.h> |
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#include <linux/module.h> |
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#include <linux/atomic.h> |
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#ifndef _IIO_TRIGGER_H_ |
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#define _IIO_TRIGGER_H_ |
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#ifdef CONFIG_IIO_TRIGGER |
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struct iio_subirq { |
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bool enabled; |
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}; |
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struct iio_dev; |
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struct iio_trigger; |
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/** |
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* struct iio_trigger_ops - operations structure for an iio_trigger. |
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* @set_trigger_state: switch on/off the trigger on demand |
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* @reenable: function to reenable the trigger when the |
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* use count is zero (may be NULL) |
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* @validate_device: function to validate the device when the |
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* current trigger gets changed. |
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* |
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* This is typically static const within a driver and shared by |
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* instances of a given device. |
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**/ |
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struct iio_trigger_ops { |
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int (*set_trigger_state)(struct iio_trigger *trig, bool state); |
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void (*reenable)(struct iio_trigger *trig); |
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int (*validate_device)(struct iio_trigger *trig, |
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struct iio_dev *indio_dev); |
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}; |
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/** |
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* struct iio_trigger - industrial I/O trigger device |
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* @ops: [DRIVER] operations structure |
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* @owner: [INTERN] owner of this driver module |
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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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* @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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* @use_count: [INTERN] use count for the trigger. |
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* @subirq_chip: [INTERN] associate 'virtual' irq chip. |
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* @subirq_base: [INTERN] base number for irqs provided by trigger. |
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* @subirqs: [INTERN] information about the 'child' irqs. |
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* @pool: [INTERN] bitmap of irqs currently in use. |
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* @pool_lock: [INTERN] protection of the irq pool. |
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* @attached_own_device:[INTERN] if we are using our own device as trigger, |
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* i.e. if we registered a poll function to the same |
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* device as the one providing the trigger. |
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* @reenable_work: [INTERN] work item used to ensure reenable can sleep. |
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**/ |
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struct iio_trigger { |
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const struct iio_trigger_ops *ops; |
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struct module *owner; |
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int id; |
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const char *name; |
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struct device dev; |
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struct list_head list; |
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struct list_head alloc_list; |
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atomic_t use_count; |
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struct irq_chip subirq_chip; |
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int subirq_base; |
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struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER]; |
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unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)]; |
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struct mutex pool_lock; |
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bool attached_own_device; |
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struct work_struct reenable_work; |
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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_trigger_put(struct iio_trigger *trig) |
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{ |
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module_put(trig->owner); |
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put_device(&trig->dev); |
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} |
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static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig) |
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{ |
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get_device(&trig->dev); |
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WARN_ONCE(list_empty(&trig->list), |
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"Getting non-registered iio trigger %s is prohibited\n", |
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trig->name); |
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__module_get(trig->owner); |
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return trig; |
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} |
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/** |
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* iio_trigger_set_drvdata() - Set trigger driver data |
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* @trig: IIO trigger structure |
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* @data: Driver specific data |
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* |
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* Allows to attach an arbitrary pointer to an IIO trigger, which can later be |
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* retrieved by iio_trigger_get_drvdata(). |
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*/ |
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static inline void iio_trigger_set_drvdata(struct iio_trigger *trig, void *data) |
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{ |
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dev_set_drvdata(&trig->dev, data); |
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} |
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/** |
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* iio_trigger_get_drvdata() - Get trigger driver data |
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* @trig: IIO trigger structure |
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* |
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* Returns the data previously set with iio_trigger_set_drvdata() |
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*/ |
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static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig) |
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{ |
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return dev_get_drvdata(&trig->dev); |
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} |
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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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int devm_iio_trigger_register(struct device *dev, |
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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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* @trig_info: trigger to be unregistered |
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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_set_immutable() - set an immutable trigger on destination |
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* |
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* @indio_dev: IIO device structure containing the device |
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* @trig: trigger to assign to device |
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* |
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**/ |
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int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig); |
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/** |
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* iio_trigger_poll() - called on a trigger occurring |
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* @trig: trigger which occurred |
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* |
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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 *trig); |
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void iio_trigger_poll_chained(struct iio_trigger *trig); |
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irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private); |
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#define iio_trigger_alloc(parent, fmt, ...) \ |
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__iio_trigger_alloc((parent), THIS_MODULE, (fmt), ##__VA_ARGS__) |
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__printf(3, 4) |
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struct iio_trigger *__iio_trigger_alloc(struct device *parent, |
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struct module *this_mod, |
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const char *fmt, ...); |
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void iio_trigger_free(struct iio_trigger *trig); |
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/** |
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* iio_trigger_using_own() - tells us if we use our own HW trigger ourselves |
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* @indio_dev: device to check |
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*/ |
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bool iio_trigger_using_own(struct iio_dev *indio_dev); |
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int iio_trigger_validate_own_device(struct iio_trigger *trig, |
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struct iio_dev *indio_dev); |
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#else |
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struct iio_trigger; |
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struct iio_trigger_ops; |
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#endif |
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#endif /* _IIO_TRIGGER_H_ */
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