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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>
This commit is contained in:
Boris Brezillon 2018-04-22 20:35:14 +02:00 committed by Mark Brown
parent e1f16b0493
commit 46336966bf
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GPG Key ID: 24D68B725D5487D0
2 changed files with 48 additions and 18 deletions
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41
drivers/spi/internals.h Normal file
View File

@ -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 */

25
drivers/spi/spi.c
View File

@ -46,6 +46,8 @@
#define CREATE_TRACE_POINTS
#include <trace/events/spi.h>
#include "internals.h"
static DEFINE_IDR(spi_master_idr);
static void spidev_release(struct device *dev)
@ -740,9 +742,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
}
#ifdef CONFIG_HAS_DMA
static 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)
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)
{
const bool vmalloced_buf = is_vmalloc_addr(buf);
unsigned int max_seg_size = dma_get_max_seg_size(dev);
@ -821,8 +823,8 @@ static int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
return 0;
}
static void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
struct sg_table *sgt, 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)
{
if (sgt->orig_nents) {
dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
@ -907,19 +909,6 @@ static int __spi_unmap_msg(struct spi_controller *ctlr, struct spi_message *msg)
return 0;
}
#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)
{
}
static inline int __spi_map_msg(struct spi_controller *ctlr,
struct spi_message *msg)
{