From e36db6a06937c6fce3291f0c362d4f757b8ec703 Mon Sep 17 00:00:00 2001 From: Alexandru Ardelean Date: Mon, 15 Feb 2021 12:40:21 +0200 Subject: 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 Link: https://lore.kernel.org/r/20210215104043.91251-3-alexandru.ardelean@analog.com Signed-off-by: Jonathan Cameron --- drivers/iio/buffer/kfifo_buf.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'drivers/iio/buffer') diff --git a/drivers/iio/buffer/kfifo_buf.c b/drivers/iio/buffer/kfifo_buf.c index 1359abed3b31..6472c9fa1937 100644 --- a/drivers/iio/buffer/kfifo_buf.c +++ b/drivers/iio/buffer/kfifo_buf.c @@ -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"); -- cgit