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authorBoris Brezillon <boris.brezillon@bootlin.com>2018-04-22 20:35:14 +0200
committerMark Brown <broonie@kernel.org>2018-04-23 15:48:06 +0100
commit46336966bf0852d76f76c1292c057635b05dbb1b (patch)
treee5bfdfe55d71e6d5aab874f760f6916211fb35c7 /drivers/spi/internals.h
parente1f16b0493a01820a137ebbdd96bf695e427fabe (diff)
downloadlinux-46336966bf0852d76f76c1292c057635b05dbb1b.tar.bz2
spi: Expose spi_{map,unmap}_buf() for internal use
spi_{map,unmap}_buf() are needed by the spi-mem logic that is about to be introduced to prepare data buffer for DMA operations. Remove the static specifier on these functions and add their prototypes to drivers/spi/internals.h. We do not export the symbols here because both SPI_MEM and SPI can't be enabled as modules and we'd like to prevent controller/device drivers from using these functions. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/internals.h')
-rw-r--r--drivers/spi/internals.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/spi/internals.h b/drivers/spi/internals.h
new file mode 100644
index 000000000000..dbe56c77b464
--- /dev/null
+++ b/drivers/spi/internals.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Exceet Electronics GmbH
+ * Copyright (C) 2018 Bootlin
+ *
+ * Author: Boris Brezillon <boris.brezillon@bootlin.com>
+ *
+ * Helpers needed by the spi or spi-mem logic. Should not be used outside of
+ * spi-mem.c and spi.c.
+ */
+
+#ifndef __LINUX_SPI_INTERNALS_H
+#define __LINUX_SPI_INTERNALS_H
+
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/scatterlist.h>
+#include <linux/spi/spi.h>
+
+#ifdef CONFIG_HAS_DMA
+int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
+ struct sg_table *sgt, void *buf, size_t len,
+ enum dma_data_direction dir);
+void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
+ struct sg_table *sgt, enum dma_data_direction dir);
+#else /* !CONFIG_HAS_DMA */
+static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
+ struct sg_table *sgt, void *buf, size_t len,
+ enum dma_data_direction dir)
+{
+ return -EINVAL;
+}
+
+static inline void spi_unmap_buf(struct spi_controller *ctlr,
+ struct device *dev, struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+}
+#endif /* CONFIG_HAS_DMA */
+
+#endif /* __LINUX_SPI_INTERNALS_H */