Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __SPI_BITBANG_H
|
|
#define __SPI_BITBANG_H
|
|
|
|
#include <linux/workqueue.h>
|
|
|
|
typedef u32 (*spi_bb_txrx_word_fn)(struct spi_device *, unsigned int, u32, u8, unsigned int);
|
|
|
|
struct spi_bitbang {
|
|
struct mutex lock;
|
|
u8 busy;
|
|
u8 use_dma;
|
|
u16 flags; /* extra spi->mode support */
|
|
|
|
struct spi_controller *ctlr;
|
|
|
|
/* 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
|
|
|
|
void (*set_mosi_idle)(struct spi_device *spi);
|
|
/* 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 */
|
|
spi_bb_txrx_word_fn txrx_word[SPI_MODE_X_MASK + 1];
|
|
|
|
int (*set_line_direction)(struct spi_device *spi, bool output);
|
|
};
|
|
|
|
/* 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_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_init(struct spi_bitbang *spi);
|
|
extern void spi_bitbang_stop(struct spi_bitbang *spi);
|
|
|
|
#endif /* __SPI_BITBANG_H */
|