projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9904f22a DB |
1 | #ifndef __SPI_BITBANG_H |
| 2 | #define __SPI_BITBANG_H | |
| 3 | ||
| effdb949 FLVC |
4 | #include <linux/workqueue.h> |
| 5 | ||
| 9904f22a | 6 | struct spi_bitbang { |
| 9904f22a | 7 | spinlock_t lock; |
| 9904f22a | 8 | u8 busy; |
| 9904f22a | 9 | u8 use_dma; |
| dccd573b | 10 | u8 flags; /* extra spi->mode support */ |
| 9904f22a DB |
11 | |
| 12 | struct spi_master *master; | |
| 13 | ||
| 4cff33f9 ID |
14 | /* setup_transfer() changes clock and/or wordsize to match settings |
| 15 | * for this transfer; zeroes restore defaults from spi_device. | |
| 16 | */ | |
| 17 | int (*setup_transfer)(struct spi_device *spi, | |
| 18 | struct spi_transfer *t); | |
| 19 | ||
| 9904f22a | 20 | void (*chipselect)(struct spi_device *spi, int is_on); |
| 8275c642 VW |
21 | #define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */ |
| 22 | #define BITBANG_CS_INACTIVE 0 | |
| 9904f22a | 23 | |
| 8275c642 VW |
24 | /* txrx_bufs() may handle dma mapping for transfers that don't |
| 25 | * already have one (transfer.{tx,rx}_dma is zero), or use PIO | |
| 26 | */ | |
| 9904f22a | 27 | int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); |
| 8275c642 VW |
28 | |
| 29 | /* txrx_word[SPI_MODE_*]() just looks like a shift register */ | |
| 9904f22a DB |
30 | u32 (*txrx_word[4])(struct spi_device *spi, |
| 31 | unsigned nsecs, | |
| 32 | u32 word, u8 bits); | |
| 33 | }; | |
| 34 | ||
| 35 | /* you can call these default bitbang->master methods from your custom | |
| 36 | * methods, if you like. | |
| 37 | */ | |
| 38 | extern int spi_bitbang_setup(struct spi_device *spi); | |
| 0ffa0285 | 39 | extern void spi_bitbang_cleanup(struct spi_device *spi); |
| ff9f4771 KG |
40 | extern int spi_bitbang_setup_transfer(struct spi_device *spi, |
| 41 | struct spi_transfer *t); | |
| 9904f22a DB |
42 | |
| 43 | /* start or stop queue processing */ | |
| 44 | extern int spi_bitbang_start(struct spi_bitbang *spi); | |
| d9721ae1 | 45 | extern void spi_bitbang_stop(struct spi_bitbang *spi); |
| 9904f22a DB |
46 | |
| 47 | #endif /* __SPI_BITBANG_H */ |