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Linux/include/linux/iio/trigger.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /* The industrial I/O core, trigger handling functions
  3  *
  4  * Copyright (c) 2008 Jonathan Cameron
  5  */
  6 #include <linux/irq.h>
  7 #include <linux/module.h>
  8 #include <linux/atomic.h>
  9 
 10 #ifndef _IIO_TRIGGER_H_
 11 #define _IIO_TRIGGER_H_
 12 
 13 #ifdef CONFIG_IIO_TRIGGER
 14 struct iio_subirq {
 15         bool enabled;
 16 };
 17 
 18 struct iio_dev;
 19 struct iio_trigger;
 20 
 21 /**
 22  * struct iio_trigger_ops - operations structure for an iio_trigger.
 23  * @set_trigger_state:  switch on/off the trigger on demand
 24  * @try_reenable:       function to reenable the trigger when the
 25  *                      use count is zero (may be NULL)
 26  * @validate_device:    function to validate the device when the
 27  *                      current trigger gets changed.
 28  *
 29  * This is typically static const within a driver and shared by
 30  * instances of a given device.
 31  **/
 32 struct iio_trigger_ops {
 33         int (*set_trigger_state)(struct iio_trigger *trig, bool state);
 34         int (*try_reenable)(struct iio_trigger *trig);
 35         int (*validate_device)(struct iio_trigger *trig,
 36                                struct iio_dev *indio_dev);
 37 };
 38 
 39 
 40 /**
 41  * struct iio_trigger - industrial I/O trigger device
 42  * @ops:                [DRIVER] operations structure
 43  * @owner:              [INTERN] owner of this driver module
 44  * @id:                 [INTERN] unique id number
 45  * @name:               [DRIVER] unique name
 46  * @dev:                [DRIVER] associated device (if relevant)
 47  * @list:               [INTERN] used in maintenance of global trigger list
 48  * @alloc_list:         [DRIVER] used for driver specific trigger list
 49  * @use_count:          [INTERN] use count for the trigger.
 50  * @subirq_chip:        [INTERN] associate 'virtual' irq chip.
 51  * @subirq_base:        [INTERN] base number for irqs provided by trigger.
 52  * @subirqs:            [INTERN] information about the 'child' irqs.
 53  * @pool:               [INTERN] bitmap of irqs currently in use.
 54  * @pool_lock:          [INTERN] protection of the irq pool.
 55  * @attached_own_device:[INTERN] if we are using our own device as trigger,
 56  *                      i.e. if we registered a poll function to the same
 57  *                      device as the one providing the trigger.
 58  **/
 59 struct iio_trigger {
 60         const struct iio_trigger_ops    *ops;
 61         struct module                   *owner;
 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         bool                            attached_own_device;
 77 };
 78 
 79 
 80 static inline struct iio_trigger *to_iio_trigger(struct device *d)
 81 {
 82         return container_of(d, struct iio_trigger, dev);
 83 }
 84 
 85 static inline void iio_trigger_put(struct iio_trigger *trig)
 86 {
 87         module_put(trig->owner);
 88         put_device(&trig->dev);
 89 }
 90 
 91 static inline struct iio_trigger *iio_trigger_get(struct iio_trigger *trig)
 92 {
 93         get_device(&trig->dev);
 94         __module_get(trig->owner);
 95 
 96         return trig;
 97 }
 98 
 99 /**
100  * iio_device_set_drvdata() - Set trigger driver data
101  * @trig: IIO trigger structure
102  * @data: Driver specific data
103  *
104  * Allows to attach an arbitrary pointer to an IIO trigger, which can later be
105  * retrieved by iio_trigger_get_drvdata().
106  */
107 static inline void iio_trigger_set_drvdata(struct iio_trigger *trig, void *data)
108 {
109         dev_set_drvdata(&trig->dev, data);
110 }
111 
112 /**
113  * iio_trigger_get_drvdata() - Get trigger driver data
114  * @trig: IIO trigger structure
115  *
116  * Returns the data previously set with iio_trigger_set_drvdata()
117  */
118 static inline void *iio_trigger_get_drvdata(struct iio_trigger *trig)
119 {
120         return dev_get_drvdata(&trig->dev);
121 }
122 
123 /**
124  * iio_trigger_register() - register a trigger with the IIO core
125  * @trig_info:  trigger to be registered
126  **/
127 #define iio_trigger_register(trig_info) \
128         __iio_trigger_register((trig_info), THIS_MODULE)
129 int __iio_trigger_register(struct iio_trigger *trig_info,
130                            struct module *this_mod);
131 
132 #define devm_iio_trigger_register(dev, trig_info) \
133         __devm_iio_trigger_register((dev), (trig_info), THIS_MODULE)
134 int __devm_iio_trigger_register(struct device *dev,
135                                 struct iio_trigger *trig_info,
136                                 struct module *this_mod);
137 
138 /**
139  * iio_trigger_unregister() - unregister a trigger from the core
140  * @trig_info:  trigger to be unregistered
141  **/
142 void iio_trigger_unregister(struct iio_trigger *trig_info);
143 
144 void devm_iio_trigger_unregister(struct device *dev,
145                                  struct iio_trigger *trig_info);
146 
147 /**
148  * iio_trigger_set_immutable() - set an immutable trigger on destination
149  *
150  * @indio_dev: IIO device structure containing the device
151  * @trig: trigger to assign to device
152  *
153  **/
154 int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig);
155 
156 /**
157  * iio_trigger_poll() - called on a trigger occurring
158  * @trig:       trigger which occurred
159  *
160  * Typically called in relevant hardware interrupt handler.
161  **/
162 void iio_trigger_poll(struct iio_trigger *trig);
163 void iio_trigger_poll_chained(struct iio_trigger *trig);
164 
165 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
166 
167 __printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
168 void iio_trigger_free(struct iio_trigger *trig);
169 
170 /**
171  * iio_trigger_using_own() - tells us if we use our own HW trigger ourselves
172  * @indio_dev:  device to check
173  */
174 bool iio_trigger_using_own(struct iio_dev *indio_dev);
175 
176 int iio_trigger_validate_own_device(struct iio_trigger *trig,
177                                      struct iio_dev *indio_dev);
178 
179 #else
180 struct iio_trigger;
181 struct iio_trigger_ops;
182 #endif
183 #endif /* _IIO_TRIGGER_H_ */
184 

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