diff options
Diffstat (limited to 'drivers/staging/iio/trigger.h')
| -rw-r--r-- | drivers/staging/iio/trigger.h | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/drivers/staging/iio/trigger.h b/drivers/staging/iio/trigger.h index c6ab32f..0c44c5e 100644 --- a/drivers/staging/iio/trigger.h +++ b/drivers/staging/iio/trigger.h @@ -6,9 +6,15 @@ * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ +#include <linux/irq.h> + #ifndef _IIO_TRIGGER_H_ #define _IIO_TRIGGER_H_ +struct iio_subirq { + bool enabled; +}; + /** * struct iio_trigger - industrial I/O trigger device * @@ -43,6 +49,13 @@ struct iio_trigger { int (*set_trigger_state)(struct iio_trigger *trig, bool state); int (*try_reenable)(struct iio_trigger *trig); + + 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; }; static inline struct iio_trigger *to_iio_trigger(struct device *d) @@ -114,6 +127,27 @@ int iio_trigger_dettach_poll_func(struct iio_trigger *trig, void iio_trigger_poll(struct iio_trigger *trig, s64 time); void iio_trigger_notify_done(struct iio_trigger *trig); +static inline int iio_trigger_get_irq(struct iio_trigger *trig) +{ + int ret; + mutex_lock(&trig->pool_lock); + ret = bitmap_find_free_region(trig->pool, + CONFIG_IIO_CONSUMERS_PER_TRIGGER, + ilog2(1)); + mutex_unlock(&trig->pool_lock); + if (ret >= 0) + ret += trig->subirq_base; + + return ret; +}; + +static inline void iio_trigger_put_irq(struct iio_trigger *trig, int irq) +{ + mutex_lock(&trig->pool_lock); + clear_bit(irq - trig->subirq_base, trig->pool); + mutex_unlock(&trig->pool_lock); +}; + /** * struct iio_poll_func - poll function pair * @@ -125,11 +159,14 @@ void iio_trigger_notify_done(struct iio_trigger *trig); * @poll_func_main: function in here is run after all immediates. * Reading from sensor etc typically involves * scheduling from here. - * - * The two stage approach used here is only important when multiple sensors are - * being triggered by a single trigger. This really comes into its own with - * simultaneous sampling devices where a simple latch command can be used to - * make the device store the values on all inputs. + * @h: the function that is actually run on trigger + * @thread: threaded interrupt part + * @type: the type of interrupt (basically if oneshot) + * @irq: the corresponding irq as allocated from the + * trigger pool + * @timestamp: some devices need a timestamp grabbed as soon + * as possible after the trigger - hence handler + * passes it via here. **/ struct iio_poll_func { struct list_head list; @@ -137,12 +174,20 @@ struct iio_poll_func { void (*poll_func_immediate)(struct iio_dev *indio_dev); void (*poll_func_main)(struct iio_dev *private_data, s64 time); + irqreturn_t (*h)(int irq, void *p); + irqreturn_t (*thread)(int irq, void *p); + int type; + char *name; + int irq; + s64 timestamp; }; int iio_alloc_pollfunc(struct iio_dev *indio_dev, void (*immediate)(struct iio_dev *indio_dev), void (*main)(struct iio_dev *private_data, s64 time)); +irqreturn_t iio_pollfunc_store_time(int irq, void *p); + /* * Two functions for common case where all that happens is a pollfunc * is attached and detached from a trigger @@ -151,7 +196,7 @@ int iio_triggered_ring_postenable(struct iio_dev *indio_dev); int iio_triggered_ring_predisable(struct iio_dev *indio_dev); struct iio_trigger *iio_allocate_trigger(void); - +struct iio_trigger *iio_allocate_trigger_named(const char *name); void iio_free_trigger(struct iio_trigger *trig); #endif /* _IIO_TRIGGER_H_ */ |