1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __SPI_BITBANG_H 2 #ifndef __SPI_BITBANG_H
3 #define __SPI_BITBANG_H 3 #define __SPI_BITBANG_H
4 4
5 #include <linux/workqueue.h> 5 #include <linux/workqueue.h>
6 6
7 typedef u32 (*spi_bb_txrx_word_fn)(struct spi_ 7 typedef u32 (*spi_bb_txrx_word_fn)(struct spi_device *, unsigned int, u32, u8, unsigned int);
8 8
9 struct spi_bitbang { 9 struct spi_bitbang {
10 struct mutex lock; 10 struct mutex lock;
11 u8 busy; 11 u8 busy;
12 u8 use_dma; 12 u8 use_dma;
13 u16 flags; 13 u16 flags; /* extra spi->mode support */
14 14
15 struct spi_controller *ctlr; 15 struct spi_controller *ctlr;
16 16
17 /* setup_transfer() changes clock and/ 17 /* setup_transfer() changes clock and/or wordsize to match settings
18 * for this transfer; zeroes restore d 18 * for this transfer; zeroes restore defaults from spi_device.
19 */ 19 */
20 int (*setup_transfer)(struct spi_d 20 int (*setup_transfer)(struct spi_device *spi,
21 struct spi_transfer *t 21 struct spi_transfer *t);
22 22
23 void (*chipselect)(struct spi_devic 23 void (*chipselect)(struct spi_device *spi, int is_on);
24 #define BITBANG_CS_ACTIVE 1 /* nor 24 #define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */
25 #define BITBANG_CS_INACTIVE 0 25 #define BITBANG_CS_INACTIVE 0
26 26
27 void (*set_mosi_idle)(struct spi_de 27 void (*set_mosi_idle)(struct spi_device *spi);
28 /* txrx_bufs() may handle dma mapping 28 /* txrx_bufs() may handle dma mapping for transfers that don't
29 * already have one (transfer.{tx,rx}_ 29 * already have one (transfer.{tx,rx}_dma is zero), or use PIO
30 */ 30 */
31 int (*txrx_bufs)(struct spi_device 31 int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t);
32 32
33 /* txrx_word[SPI_MODE_*]() just looks 33 /* txrx_word[SPI_MODE_*]() just looks like a shift register */
34 spi_bb_txrx_word_fn txrx_word[SPI_MODE 34 spi_bb_txrx_word_fn txrx_word[SPI_MODE_X_MASK + 1];
35 35
36 int (*set_line_direction)(struct s 36 int (*set_line_direction)(struct spi_device *spi, bool output);
37 }; 37 };
38 38
39 /* you can call these default bitbang->master 39 /* you can call these default bitbang->master methods from your custom
40 * methods, if you like. 40 * methods, if you like.
41 */ 41 */
42 extern int spi_bitbang_setup(struct spi_device 42 extern int spi_bitbang_setup(struct spi_device *spi);
43 extern void spi_bitbang_cleanup(struct spi_dev 43 extern void spi_bitbang_cleanup(struct spi_device *spi);
44 extern int spi_bitbang_setup_transfer(struct s 44 extern int spi_bitbang_setup_transfer(struct spi_device *spi,
45 struct s 45 struct spi_transfer *t);
46 46
47 /* start or stop queue processing */ 47 /* start or stop queue processing */
48 extern int spi_bitbang_start(struct spi_bitban 48 extern int spi_bitbang_start(struct spi_bitbang *spi);
49 extern int spi_bitbang_init(struct spi_bitbang 49 extern int spi_bitbang_init(struct spi_bitbang *spi);
50 extern void spi_bitbang_stop(struct spi_bitban 50 extern void spi_bitbang_stop(struct spi_bitbang *spi);
51 51
52 #endif /* __SPI_BITBANG_H */ 52 #endif /* __SPI_BITBANG_H */
53 53
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