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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /include/linux/spi/spi_bitbang.h | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'include/linux/spi/spi_bitbang.h')
-rw-r--r-- | include/linux/spi/spi_bitbang.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h new file mode 100644 index 00000000..f987a2be --- /dev/null +++ b/include/linux/spi/spi_bitbang.h @@ -0,0 +1,52 @@ +#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 */ |