kernel/linux.git/drivers/iio/buffer, branch v6.12.80

iio: buffer-dmaengine: enable .get_dma_dev()

2025-12-06T21:24:57+00:00

commit 3db847df994d475db7812dde90376f2848bcd30a upstream. Wire up the .get_dma_dev() callback to use the DMA buffer infrastructure's implementation. This ensures that DMABUF operations use the correct DMA device for mapping, which is essential for proper operation on systems where memory is mapped above the 32-bit range. Without this callback, the core would fall back to using the IIO device's parent, which may not have the appropriate DMA mask configuration for high memory access. Fixes: 7a86d469983a ("iio: buffer-dmaengine: Support new DMABUF based userspace API") Reviewed-by: David Lechner Signed-off-by: Nuno Sá Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman

iio: buffer-dma: support getting the DMA channel

2025-12-06T21:24:57+00:00

commit f9c198c3ccaf90a1a265fb2ffa8d4b093c3b0784 upstream. Implement the .get_dma_dev() callback for DMA buffers by returning the device that owns the DMA channel. This allows the core DMABUF infrastructure to properly map DMA buffers using the correct device, avoiding the need for bounce buffers on systems where memory is mapped above the 32-bit range. The function returns the DMA queue's device, which is the actual device responsible for DMA operations in buffer-dma implementations. Cc: stable@vger.kernel.org Reviewed-by: David Lechner Signed-off-by: Nuno Sá Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman

Merge 6.11-rc7 into char-misc-next

2024-09-09T06:36:23+00:00

We need the char-misc fixes in here as well. Signed-off-by: Greg Kroah-Hartman

iio: buffer-dma: Move exports into IIO_DMA_BUFFER namespace

2024-08-03T09:13:43+00:00

Avoid unnecessary pollution of the global symbol namespace and move global APIs into a specific namespace. Import that into the places that use them Signed-off-by: Nuno Sa Link: https://patch.msgid.link/20240726-dev-iio-dma-buf-mod-namespace-v1-1-8877cfe7f68e@analog.com Signed-off-by: Jonathan Cameron

iio: buffer-dmaengine: fix releasing dma channel on error

2024-07-29T19:31:23+00:00

If dma_get_slave_caps() fails, we need to release the dma channel before returning an error to avoid leaking the channel. Fixes: 2d6ca60f3284 ("iio: Add a DMAengine framework based buffer") Signed-off-by: David Lechner Link: https://patch.msgid.link/20240723-iio-fix-dmaengine-free-on-error-v1-1-2c7cbc9b92ff@baylibre.com Cc: Signed-off-by: Jonathan Cameron

iio: buffer: make use of iio_get_masklength()

2024-07-29T19:31:07+00:00

Use iio_get_masklength() to access '.masklength' so it can be annotated as __private when there are no more direct users of it. While at it, remove some unneeded line breaks. Signed-off-by: Nuno Sa Reviewed-by: Alexandru Ardelean Link: https://patch.msgid.link/20240702-dev-iio-masklength-private-v1-3-98193bf536a6@analog.com Signed-off-by: Jonathan Cameron

iio: buffer-dmaengine: Support new DMABUF based userspace API

2024-06-30T10:29:28+00:00

Use the functions provided by the buffer-dma core to implement the DMABUF userspace API in the buffer-dmaengine IIO buffer implementation. Since we want to be able to transfer an arbitrary number of bytes and not necesarily the full DMABUF, the associated scatterlist is converted to an array of DMA addresses + lengths, which is then passed to dmaengine_prep_slave_dma_array(). Signed-off-by: Paul Cercueil Co-developed-by: Nuno Sa Signed-off-by: Nuno Sa Link: https://patch.msgid.link/20240620122726.41232-6-paul@crapouillou.net Signed-off-by: Jonathan Cameron

iio: buffer-dma: Enable support for DMABUFs

2024-06-30T10:29:24+00:00

Implement iio_dma_buffer_attach_dmabuf(), iio_dma_buffer_detach_dmabuf() and iio_dma_buffer_transfer_dmabuf(), which can then be used by the IIO DMA buffer implementations. Signed-off-by: Paul Cercueil Co-developed-by: Nuno Sa Signed-off-by: Nuno Sa Link: https://patch.msgid.link/20240620122726.41232-5-paul@crapouillou.net Signed-off-by: Jonathan Cameron

iio: add missing MODULE_DESCRIPTION() macros

2024-06-13T18:19:23+00:00

make allmodconfig && make W=1 C=1 reports: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/iio/adc/ingenic-adc.o WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/iio/adc/xilinx-ams.o WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/iio/buffer/kfifo_buf.o Add the missing invocations of the MODULE_DESCRIPTION() macro. Signed-off-by: Jeff Johnson Link: https://lore.kernel.org/r/20240607-md-drivers-iic-v1-1-9f9db6246083@quicinc.com Signed-off-by: Jonathan Cameron

iio: buffer-dmaengine: Enable write support

2024-04-20T14:41:32+00:00

Use the iio_dma_buffer_write() and iio_dma_buffer_space_available() functions provided by the buffer-dma core, to enable write support in the buffer-dmaengine code. Signed-off-by: Paul Cercueil Reviewed-by: Alexandru Ardelean Signed-off-by: Nuno Sa Link: https://lore.kernel.org/r/20240419-iio-backend-axi-dac-v4-5-5ca45b4de294@analog.com Signed-off-by: Jonathan Cameron