From: Alexandru Ardelean <alexandru.ardelean@analog.com>
To: <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <jic23@kernel.org>, Alexandru Ardelean <alexandru.ardelean@analog.com>
Subject: [PATCH v2 3/7] iio: buffer-dmaengine: add dev-managed calls for buffer alloc
Date: Wed, 26 Feb 2020 17:08:31 +0200 [thread overview]
Message-ID: <20200226150835.19649-4-alexandru.ardelean@analog.com> (raw)
In-Reply-To: <20200226150835.19649-1-alexandru.ardelean@analog.com>
Currently, when using a 'iio_dmaengine_buffer_alloc()', an matching call to
'iio_dmaengine_buffer_free()' must be made.
With this change, this can be avoided by using
'devm_iio_dmaengine_buffer_alloc()'. The buffer will get free'd via the
device's devres handling.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
.../buffer/industrialio-buffer-dmaengine.c | 39 +++++++++++++++++++
include/linux/iio/buffer-dmaengine.h | 3 ++
2 files changed, 42 insertions(+)
diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index b129693af0fd..8f5fe2988a07 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -229,6 +229,45 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
}
EXPORT_SYMBOL_GPL(iio_dmaengine_buffer_free);
+static void __devm_iio_dmaengine_buffer_free(struct device *dev, void *res)
+{
+ iio_dmaengine_buffer_free(*(struct iio_buffer **)res);
+}
+
+/**
+ * devm_iio_dmaengine_buffer_alloc() - Resource-managed iio_dmaengine_buffer_alloc()
+ * @dev: Parent device for the buffer
+ * @channel: DMA channel name, typically "rx".
+ *
+ * This allocates a new IIO buffer which internally uses the DMAengine framework
+ * to perform its transfers. The parent device will be used to request the DMA
+ * channel.
+ *
+ * The buffer will be automatically de-allocated once the device gets destroyed.
+ */
+struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
+ const char *channel)
+{
+ struct iio_buffer **bufferp, *buffer;
+
+ bufferp = devres_alloc(__devm_iio_dmaengine_buffer_free,
+ sizeof(*bufferp), GFP_KERNEL);
+ if (!bufferp)
+ return ERR_PTR(-ENOMEM);
+
+ buffer = iio_dmaengine_buffer_alloc(dev, channel);
+ if (IS_ERR(buffer)) {
+ devres_free(bufferp);
+ return buffer;
+ }
+
+ *bufferp = buffer;
+ devres_add(dev, bufferp);
+
+ return buffer;
+}
+EXPORT_SYMBOL_GPL(devm_iio_dmaengine_buffer_alloc);
+
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("DMA buffer for the IIO framework");
MODULE_LICENSE("GPL");
diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h
index b3a57444a886..0e503db71289 100644
--- a/include/linux/iio/buffer-dmaengine.h
+++ b/include/linux/iio/buffer-dmaengine.h
@@ -14,4 +14,7 @@ struct iio_buffer *iio_dmaengine_buffer_alloc(struct device *dev,
const char *channel);
void iio_dmaengine_buffer_free(struct iio_buffer *buffer);
+struct iio_buffer *devm_iio_dmaengine_buffer_alloc(struct device *dev,
+ const char *channel);
+
#endif
--
2.20.1
next prev parent reply other threads:[~2020-02-26 15:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 15:08 [PATCH v2 0/7] iio: adi-axi-adc,ad9647: Add support for AD9467 ADC Alexandru Ardelean
2020-02-26 15:08 ` [PATCH v2 1/7] include: fpga: adi-axi-common.h: fixup whitespace tab -> space Alexandru Ardelean
2020-02-26 15:08 ` [PATCH v2 2/7] include: fpga: adi-axi-common.h: add version helper macros Alexandru Ardelean
2020-02-26 15:08 ` Alexandru Ardelean [this message]
2020-02-26 15:08 ` [PATCH v2 4/7] iio: adc: adi-axi-adc: add support for AXI ADC IP core Alexandru Ardelean
2020-02-26 23:02 ` kbuild test robot
2020-02-27 7:01 ` Ardelean, Alexandru
2020-02-26 15:08 ` [PATCH v2 5/7] dt-bindings: iio: adc: add bindings doc for AXI ADC driver Alexandru Ardelean
2020-02-27 7:06 ` Ardelean, Alexandru
2020-02-26 15:08 ` [PATCH v2 6/7] iio: adc: ad9467: add support AD9467 ADC Alexandru Ardelean
2020-02-26 15:08 ` [PATCH v2 7/7] dt-bindings: iio: adc: add bindings doc for " Alexandru Ardelean
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