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iio: kfifo: add devm_iio_kfifo_buffer_setup() helper 

This change adds the devm_iio_kfifo_buffer_setup() helper/short-hand,
which groups the simple routine of allocating a kfifo buffers via
devm_iio_kfifo_allocate() and calling iio_device_attach_buffer().

The mode_flags parameter is required, as the IIO kfifo supports 2 modes:
INDIO_BUFFER_SOFTWARE & INDIO_BUFFER_TRIGGERED.
The setup_ops parameter is optional.

This function will be a bit more useful when needing to define multiple
buffers per IIO device.

The naming for this function has been inspired from
iio_triggered_buffer_setup() since that one does a kfifo alloc + a pollfunc
alloc. So, this should have a more familiar ring to what it is.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-3-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2021-02-15 12:40:21 +02:00 committed by Jonathan Cameron
parent 0bf49ffbfe
commit e36db6a069
3 changed files with 47 additions and 0 deletions
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1
Documentation/driver-api/driver-model/devres.rst
View File

@ -286,6 +286,7 @@ IIO
devm_iio_device_alloc()
devm_iio_device_register()
devm_iio_kfifo_allocate()
devm_iio_kfifo_buffer_setup()
devm_iio_triggered_buffer_setup()
devm_iio_trigger_alloc()
devm_iio_trigger_register()

39
drivers/iio/buffer/kfifo_buf.c
View File

@ -206,4 +206,43 @@ struct iio_buffer *devm_iio_kfifo_allocate(struct device *dev)
}
EXPORT_SYMBOL(devm_iio_kfifo_allocate);
/**
* devm_iio_kfifo_buffer_setup - Allocate a kfifo buffer & attach it to an IIO device
* @dev: Device object to which to attach the life-time of this kfifo buffer
* @indio_dev: The device the buffer should be attached to
* @mode_flags: The mode flags for this buffer (INDIO_BUFFER_SOFTWARE and/or
* INDIO_BUFFER_TRIGGERED).
* @setup_ops: The setup_ops required to configure the HW part of the buffer (optional)
*
* This function allocates a kfifo buffer via devm_iio_kfifo_allocate() and
* attaches it to the IIO device via iio_device_attach_buffer().
* This is meant to be a bit of a short-hand/helper function as there are a few
* drivers that seem to do this.
*/
int devm_iio_kfifo_buffer_setup(struct device *dev,
struct iio_dev *indio_dev,
int mode_flags,
const struct iio_buffer_setup_ops *setup_ops)
{
struct iio_buffer *buffer;
if (mode_flags)
mode_flags &= kfifo_access_funcs.modes;
if (!mode_flags)
return -EINVAL;
buffer = devm_iio_kfifo_allocate(dev);
if (!buffer)
return -ENOMEM;
iio_device_attach_buffer(indio_dev, buffer);
indio_dev->modes |= mode_flags;
indio_dev->setup_ops = setup_ops;
return 0;
}
EXPORT_SYMBOL_GPL(devm_iio_kfifo_buffer_setup);
MODULE_LICENSE("GPL");

7
include/linux/iio/kfifo_buf.h
View File

@ -3,6 +3,8 @@
#define __LINUX_IIO_KFIFO_BUF_H__
struct iio_buffer;
struct iio_buffer_setup_ops;
struct iio_dev;
struct device;
struct iio_buffer *iio_kfifo_allocate(void);
@ -10,4 +12,9 @@ void iio_kfifo_free(struct iio_buffer *r);
struct iio_buffer *devm_iio_kfifo_allocate(struct device *dev);
int devm_iio_kfifo_buffer_setup(struct device *dev,
struct iio_dev *indio_dev,
int mode_flags,
const struct iio_buffer_setup_ops *setup_ops);
#endif