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Linux/include/linux/iio/trigger.h

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  1 /* The industrial I/O core, trigger handling functions
  2  *
  3  * Copyright (c) 2008 Jonathan Cameron
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 as published by
  7  * the Free Software Foundation.
  8  */
  9 #include <linux/irq.h>
 10 #include <linux/module.h>
 11 #include <linux/atomic.h>
 12 
 13 #ifndef _IIO_TRIGGER_H_
 14 #define _IIO_TRIGGER_H_
 15 
 16 #ifdef CONFIG_IIO_TRIGGER
 17 struct iio_subirq {
 18         bool enabled;
 19 };
 20 
 21 struct iio_dev;
 22 struct iio_trigger;
 23 
 24 /**
 25  * struct iio_trigger_ops - operations structure for an iio_trigger.
 26  * @owner:              used to monitor usage count of the trigger.
 27  * @set_trigger_state:  switch on/off the trigger on demand
 28  * @try_reenable:       function to reenable the trigger when the
 29  *                      use count is zero (may be NULL)
 30  * @validate_device:    function to validate the device when the
 31  *                      current trigger gets changed.
 32  *
 33  * This is typically static const within a driver and shared by
 34  * instances of a given device.
 35  **/
 36 struct iio_trigger_ops {
 37         struct module *owner;
 38         int (*set_trigger_state)(struct iio_trigger *trig, bool state);
 39         int (*try_reenable)(struct iio_trigger *trig);
 40         int (*validate_device)(struct iio_trigger *trig,
 41                                struct iio_dev *indio_dev);
 42 };
 43 
 44 
 45 /**
 46  * struct iio_trigger - industrial I/O trigger device
 47  * @ops:                [DRIVER] operations structure
 48  * @id:                 [INTERN] unique id number
 49  * @name:               [DRIVER] unique name
 50  * @dev:                [DRIVER] associated device (if relevant)
 51  * @list:               [INTERN] used in maintenance of global trigger list
 52  * @alloc_list:         [DRIVER] used for driver specific trigger list
 53  * @use_count:          use count for the trigger
 54  * @subirq_chip:        [INTERN] associate 'virtual' irq chip.
 55  * @subirq_base:        [INTERN] base number for irqs provided by trigger.
 56  * @subirqs:            [INTERN] information about the 'child' irqs.
 57  * @pool:               [INTERN] bitmap of irqs currently in use.
 58  * @pool_lock:          [INTERN] protection of the irq pool.
 59  **/
 60 struct iio_trigger {
 61         const struct iio_trigger_ops    *ops;
 62         int                             id;
 63         const char                      *name;
 64         struct device                   dev;
 65 
 66         struct list_head                list;
 67         struct list_head                alloc_list;
 68         atomic_t                        use_count;
 69 
 70         struct irq_chip                 subirq_chip;
 71         int                             subirq_base;
 72 
 73         struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
 74         unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)];
 75         struct mutex                    pool_lock;
 76 };
 77 
 78 
 79 static inline struct iio_trigger *to_iio_trigger(struct device *d)
 80 {
 81         return container_of(d, struct iio_trigger, dev);
 82 }
 83 
 84 static inline void iio_trigger_put(struct iio_trigger *trig)
 85 {
 86         module_put(trig->ops->owner);
 87         put_device(&trig->dev);
 88 }
 89 
 90 static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig)
 91 {
 92         get_device(&trig->dev);
 93         __module_get(trig->ops->owner);
 94 
 95         return trig;
 96 }
 97 
 98 /**
 99  * iio_device_set_drvdata() - Set trigger driver data
100  * @trig: IIO trigger structure
101  * @data: Driver specific data
102  *
103  * Allows to attach an arbitrary pointer to an IIO trigger, which can later be
104  * retrieved by iio_trigger_get_drvdata().
105  */
106 static inline void iio_trigger_set_drvdata(struct iio_trigger *trig, void *data)
107 {
108         dev_set_drvdata(&trig->dev, data);
109 }
110 
111 /**
112  * iio_trigger_get_drvdata() - Get trigger driver data
113  * @trig: IIO trigger structure
114  *
115  * Returns the data previously set with iio_trigger_set_drvdata()
116  */
117 static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
118 {
119         return dev_get_drvdata(&trig->dev);
120 }
121 
122 /**
123  * iio_trigger_register() - register a trigger with the IIO core
124  * @trig_info:  trigger to be registered
125  **/
126 int iio_trigger_register(struct iio_trigger *trig_info);
127 
128 /**
129  * iio_trigger_unregister() - unregister a trigger from the core
130  * @trig_info:  trigger to be unregistered
131  **/
132 void iio_trigger_unregister(struct iio_trigger *trig_info);
133 
134 /**
135  * iio_trigger_poll() - called on a trigger occurring
136  * @trig:       trigger which occurred
137  *
138  * Typically called in relevant hardware interrupt handler.
139  **/
140 void iio_trigger_poll(struct iio_trigger *trig);
141 void iio_trigger_poll_chained(struct iio_trigger *trig);
142 
143 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
144 
145 __printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
146 void iio_trigger_free(struct iio_trigger *trig);
147 
148 #else
149 struct iio_trigger;
150 struct iio_trigger_ops;
151 #endif
152 #endif /* _IIO_TRIGGER_H_ */
153 

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