Add a helper function that will retrieve a trigger by index from a device. This is intended to be used in trigger consumer drivers.
Signed-off-by: Eugen Hristev <[email protected]> --- drivers/iio/iio_core_trigger.h | 21 +++++++++++++++++++++ drivers/iio/industrialio-trigger.c | 23 +++++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/iio/iio_core_trigger.h b/drivers/iio/iio_core_trigger.h index 1fdb1e4..14c4253 100644 --- a/drivers/iio/iio_core_trigger.h +++ b/drivers/iio/iio_core_trigger.h @@ -21,6 +21,15 @@ void iio_device_register_trigger_consumer(struct iio_dev *indio_dev); **/ void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev); +/** + * iio_trigger_find_from_device() - get the trigger from the device having the + * index given. + * @indio_dev: iio_dev where to get the trigger from + * @index: the index of the trigger to retrieve + **/ +__maybe_unused struct iio_trigger * +iio_trigger_find_from_device(struct iio_dev *indio_dev, u32 index); + #else /** @@ -40,4 +49,16 @@ static void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) { } +/** + * iio_trigger_find_from_device() - get the trigger from the device having the + * index given. + * @indio_dev: iio_dev where to get the trigger from + * @index: the index of the trigger to retrieve + **/ +static __maybe_unused struct iio_trigger * +iio_trigger_find_from_device(struct iio_dev *indio_dev, u32 index) +{ + return NULL; +} + #endif /* CONFIG_TRIGGER_CONSUMER */ diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c index ce66699..cbaa079 100644 --- a/drivers/iio/industrialio-trigger.c +++ b/drivers/iio/industrialio-trigger.c @@ -134,6 +134,29 @@ int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *tri } EXPORT_SYMBOL(iio_trigger_set_immutable); +/* Find the trigger from the given device corresponding to given index */ +struct __maybe_unused iio_trigger * +iio_trigger_find_from_device(struct iio_dev *indio_dev, u32 index) +{ + struct iio_trigger *iter, *trig = NULL; + u32 i = 0; + + mutex_lock(&iio_trigger_list_lock); + + list_for_each_entry(iter, &iio_trigger_list, list) { + if (!iio_trigger_validate_own_device(iter, indio_dev)) { + if (i == index) { + trig = iter; + break; + } + i++; + } + } + mutex_unlock(&iio_trigger_list_lock); + + return trig; +} + /* Search for trigger by name, assuming iio_trigger_list_lock held */ static struct iio_trigger *__iio_trigger_find_by_name(const char *name) { -- 2.7.4
