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

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