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iio: buffer-dma,adi-axi-adc: introduce devm_iio_dmaengine_buffer_setup() 

This change does a conversion of the devm_iio_dmaengine_buffer_alloc() to
devm_iio_dmaengine_buffer_setup(). This will allocate an IIO DMA buffer and
attach it to the IIO device, similar to devm_iio_triggered_buffer_setup()
(though the underlying code is different, the final logic is the same).

Since the only user of the devm_iio_dmaengine_buffer_alloc() was the
adi-axi-adc driver, this change does the replacement in a single go in the
driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-7-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2021-02-15 12:40:25 +02:00 committed by Jonathan Cameron
parent 99f6e8215b
commit a02c09e42b
4 changed files with 38 additions and 15 deletions
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1
Documentation/driver-api/driver-model/devres.rst
View File

@ -285,6 +285,7 @@ I2C
IIO
devm_iio_device_alloc()
devm_iio_device_register()
devm_iio_dmaengine_buffer_setup()
devm_iio_kfifo_buffer_setup()
devm_iio_triggered_buffer_setup()
devm_iio_trigger_alloc()

12
drivers/iio/adc/adi-axi-adc.c
View File

@ -104,7 +104,6 @@ static unsigned int adi_axi_adc_read(struct adi_axi_adc_state *st,
static int adi_axi_adc_config_dma_buffer(struct device *dev,
struct iio_dev *indio_dev)
{
struct iio_buffer *buffer;
const char *dma_name;
if (!device_property_present(dev, "dmas"))
@ -113,15 +112,8 @@ static int adi_axi_adc_config_dma_buffer(struct device *dev,
if (device_property_read_string(dev, "dma-names", &dma_name))
dma_name = "rx";
buffer = devm_iio_dmaengine_buffer_alloc(indio_dev->dev.parent,
dma_name);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
indio_dev->modes |= INDIO_BUFFER_HARDWARE;
iio_device_attach_buffer(indio_dev, buffer);
return 0;
return devm_iio_dmaengine_buffer_setup(indio_dev->dev.parent,
indio_dev, dma_name);
}
static int adi_axi_adc_read_raw(struct iio_dev *indio_dev,

33
drivers/iio/buffer/industrialio-buffer-dmaengine.c
View File

@ -244,7 +244,7 @@ static void __devm_iio_dmaengine_buffer_free(struct device *dev, void *res)
*
* The buffer will be automatically de-allocated once the device gets destroyed.
*/
struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
static struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel)
{
struct iio_buffer **bufferp, *buffer;
@ -265,7 +265,36 @@ struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
return buffer;
}
EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_alloc);
/**
* devm_iio_dmaengine_buffer_setup() - Setup a DMA buffer for an IIO device
* @dev: Parent device for the buffer
* @indio_dev: IIO device to which to attach this buffer.
* @channel: DMA channel name, typically "rx".
*
* This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
* and attaches it to an IIO device with iio_device_attach_buffer().
* It also appends the INDIO_BUFFER_HARDWARE mode to the supported modes of the
* IIO device.
*/
int devm_iio_dmaengine_buffer_setup(struct device *dev,
struct iio_dev *indio_dev,
const char *channel)
{
struct iio_buffer *buffer;
buffer = devm_iio_dmaengine_buffer_alloc(indio_dev->dev.parent,
channel);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
indio_dev->modes |= INDIO_BUFFER_HARDWARE;
iio_device_attach_buffer(indio_dev, buffer);
return 0;
}
EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_setup);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");

7
include/linux/iio/buffer-dmaengine.h
View File

@ -7,10 +7,11 @@
#ifndef __IIO_DMAENGINE_H__
#define __IIO_DMAENGINE_H__
struct iio_buffer;
struct iio_dev;
struct device;
struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel);
int devm_iio_dmaengine_buffer_setup(struct device *dev,
struct iio_dev *indio_dev,
const char *channel);
#endif