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50 lines
1.6 KiB
50 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __SPI_BITBANG_H |
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#define __SPI_BITBANG_H |
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#include <linux/workqueue.h> |
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struct spi_bitbang { |
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struct mutex lock; |
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u8 busy; |
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u8 use_dma; |
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u16 flags; /* extra spi->mode support */ |
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struct spi_master *master; |
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/* setup_transfer() changes clock and/or wordsize to match settings |
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* for this transfer; zeroes restore defaults from spi_device. |
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*/ |
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int (*setup_transfer)(struct spi_device *spi, |
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struct spi_transfer *t); |
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void (*chipselect)(struct spi_device *spi, int is_on); |
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#define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */ |
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#define BITBANG_CS_INACTIVE 0 |
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/* txrx_bufs() may handle dma mapping for transfers that don't |
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* already have one (transfer.{tx,rx}_dma is zero), or use PIO |
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*/ |
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int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); |
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/* txrx_word[SPI_MODE_*]() just looks like a shift register */ |
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u32 (*txrx_word[4])(struct spi_device *spi, |
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unsigned nsecs, |
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u32 word, u8 bits, unsigned flags); |
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int (*set_line_direction)(struct spi_device *spi, bool output); |
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}; |
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/* you can call these default bitbang->master methods from your custom |
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* methods, if you like. |
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*/ |
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extern int spi_bitbang_setup(struct spi_device *spi); |
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extern void spi_bitbang_cleanup(struct spi_device *spi); |
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extern int spi_bitbang_setup_transfer(struct spi_device *spi, |
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struct spi_transfer *t); |
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/* start or stop queue processing */ |
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extern int spi_bitbang_start(struct spi_bitbang *spi); |
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extern int spi_bitbang_init(struct spi_bitbang *spi); |
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extern void spi_bitbang_stop(struct spi_bitbang *spi); |
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#endif /* __SPI_BITBANG_H */
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