41c4221ca6
A number of files in drivers/spi fail checkincludes.pl due to the double include of <linux/spi/spi_bitbang.h>. The first include is needed to get the struct spi_bitbang definition and the spi_bitbang_* function prototypes. The second include happens after defining EXPAND_BITBANG_TXRX to get the inlined bitbang_txrx_* utility functions. The <linux/spi/spi_bitbang.h> header is also included by a number of other spi drivers, as well as some arch/ code, in order to use struct spi_bitbang and the associated functions. To fix the double include, and remove any potential confusion about it, move the inlined bitbang_txrx_* functions to a new private header in drivers/spi and also remove the need to define EXPAND_BITBANG_TXRX. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
#ifndef __SPI_BITBANG_H
|
|
#define __SPI_BITBANG_H
|
|
|
|
#include <linux/workqueue.h>
|
|
|
|
struct spi_bitbang {
|
|
struct workqueue_struct *workqueue;
|
|
struct work_struct work;
|
|
|
|
spinlock_t lock;
|
|
struct list_head queue;
|
|
u8 busy;
|
|
u8 use_dma;
|
|
u8 flags; /* extra spi->mode support */
|
|
|
|
struct spi_master *master;
|
|
|
|
/* setup_transfer() changes clock and/or wordsize to match settings
|
|
* for this transfer; zeroes restore defaults from spi_device.
|
|
*/
|
|
int (*setup_transfer)(struct spi_device *spi,
|
|
struct spi_transfer *t);
|
|
|
|
void (*chipselect)(struct spi_device *spi, int is_on);
|
|
#define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */
|
|
#define BITBANG_CS_INACTIVE 0
|
|
|
|
/* txrx_bufs() may handle dma mapping for transfers that don't
|
|
* already have one (transfer.{tx,rx}_dma is zero), or use PIO
|
|
*/
|
|
int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t);
|
|
|
|
/* txrx_word[SPI_MODE_*]() just looks like a shift register */
|
|
u32 (*txrx_word[4])(struct spi_device *spi,
|
|
unsigned nsecs,
|
|
u32 word, u8 bits);
|
|
};
|
|
|
|
/* you can call these default bitbang->master methods from your custom
|
|
* methods, if you like.
|
|
*/
|
|
extern int spi_bitbang_setup(struct spi_device *spi);
|
|
extern void spi_bitbang_cleanup(struct spi_device *spi);
|
|
extern int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m);
|
|
extern int spi_bitbang_setup_transfer(struct spi_device *spi,
|
|
struct spi_transfer *t);
|
|
|
|
/* start or stop queue processing */
|
|
extern int spi_bitbang_start(struct spi_bitbang *spi);
|
|
extern int spi_bitbang_stop(struct spi_bitbang *spi);
|
|
|
|
#endif /* __SPI_BITBANG_H */
|