Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| David Brownell |
129 |
65.48% |
2 |
16.67% |
| Imre Deak |
18 |
9.14% |
1 |
8.33% |
| Lorenzo Bianconi |
18 |
9.14% |
2 |
16.67% |
| Kumar Gala |
13 |
6.60% |
1 |
8.33% |
| Vitaly Wool |
11 |
5.58% |
1 |
8.33% |
| Fernando Luis Vázquez Cao |
3 |
1.52% |
1 |
8.33% |
| Nicolas Boichat |
2 |
1.02% |
1 |
8.33% |
| Axel Lin |
1 |
0.51% |
1 |
8.33% |
| Greg Kroah-Hartman |
1 |
0.51% |
1 |
8.33% |
| David Lechner |
1 |
0.51% |
1 |
8.33% |
| Total |
197 |
|
12 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __SPI_BITBANG_H
#define __SPI_BITBANG_H
#include <linux/workqueue.h>
struct spi_bitbang {
struct mutex lock;
u8 busy;
u8 use_dma;
u16 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, unsigned flags);
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 void spi_bitbang_stop(struct spi_bitbang *spi);
#endif /* __SPI_BITBANG_H */