diff options
Diffstat (limited to 'drivers/spi/internals.h')
| -rw-r--r-- | drivers/spi/internals.h | 41 |
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 */ |