From 46336966bf0852d76f76c1292c057635b05dbb1b Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Sun, 22 Apr 2018 20:35:14 +0200 Subject: 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 Signed-off-by: Mark Brown --- drivers/spi/internals.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/spi/internals.h (limited to 'drivers/spi/internals.h') 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 + * + * 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 +#include +#include +#include + +#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 */ -- cgit v1.2.3