drivers/spi/internals.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (C) 2018 Exceet Electronics GmbH
   4  * Copyright (C) 2018 Bootlin
   5  *
   6  * Author: Boris Brezillon <boris.brezillon@bootlin.com>
   7  *
   8  * Helpers needed by the spi or spi-mem logic. Should not be used outside of
   9  * spi-mem.c and spi.c.
  10  */
  11
  12 #ifndef __LINUX_SPI_INTERNALS_H
  13 #define __LINUX_SPI_INTERNALS_H
  14
  15 #include <linux/device.h>
  16 #include <linux/dma-direction.h>
  17 #include <linux/scatterlist.h>
  18 #include <linux/spi/spi.h>
  19
  20 void spi_flush_queue(struct spi_controller *ctrl);
  21
  22 #ifdef CONFIG_HAS_DMA
  23 int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
  24                 struct sg_table *sgt, void *buf, size_t len,
  25                 enum dma_data_direction dir);
  26 void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
  27                    struct sg_table *sgt, enum dma_data_direction dir);
  28 #else /* !CONFIG_HAS_DMA */
  29 static inline int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
  30                               struct sg_table *sgt, void *buf, size_t len,
  31                               enum dma_data_direction dir)
  32 {
  33         return -EINVAL;
  34 }
  35
  36 static inline void spi_unmap_buf(struct spi_controller *ctlr,
  37                                  struct device *dev, struct sg_table *sgt,
  38                                  enum dma_data_direction dir)
  39 {
  40 }
  41 #endif /* CONFIG_HAS_DMA */
  42
  43 #endif /* __LINUX_SPI_INTERNALS_H */