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iio: locking: introduce __cleanup() based direct mode claiming infrastructure

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Allows use of:

       iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
       }

to automatically call iio_device_release_direct_mode() based on scope.
Typically seen in combination with local device specific locks which
are already have automated cleanup options via guard(mutex)(&st->lock)
and scoped_guard(). Using both together allows most error handling to
be automated.

Reviewed-by: Nuno Sa <nuno.a@analog.com>
Link: https://lore.kernel.org/r/20240128150537.44592-2-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jonathan Cameron 2024-01-28 15:05:28 +00:00
parent f7b6443f34
commit 1dae0cb79c
1 changed files with 28 additions and 0 deletions
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28
include/linux/iio/iio.h
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@ -9,6 +9,7 @@
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/cleanup.h>
#include <linux/slab.h>
#include <linux/iio/types.h>
/* IIO TODO LIST */
@ -638,6 +639,33 @@ int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev,
int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp);
int iio_device_claim_direct_mode(struct iio_dev *indio_dev);
void iio_device_release_direct_mode(struct iio_dev *indio_dev);
/*
* This autocleanup logic is normally used via
* iio_device_claim_direct_scoped().
*/
DEFINE_GUARD(iio_claim_direct, struct iio_dev *, iio_device_claim_direct_mode(_T),
iio_device_release_direct_mode(_T))
DEFINE_GUARD_COND(iio_claim_direct, _try, ({
struct iio_dev *dev;
int d = iio_device_claim_direct_mode(_T);
if (d < 0)
dev = NULL;
else
dev = _T;
dev;
}))
/**
* iio_device_claim_direct_scoped() - Scoped call to iio_device_claim_direct.
* @fail: What to do on failure to claim device.
* @iio_dev: Pointer to the IIO devices structure
*/
#define iio_device_claim_direct_scoped(fail, iio_dev) \
scoped_cond_guard(iio_claim_direct_try, fail, iio_dev)
int iio_device_claim_buffer_mode(struct iio_dev *indio_dev);
void iio_device_release_buffer_mode(struct iio_dev *indio_dev);