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b90cc232e2
Instead of using hard coded number of modes, replace it with SPI_MODE_X_MASK + 1 to show relation to the SPI modes. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://msgid.link/r/20240517194104.747328-4-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* 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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typedef u32 (*spi_bb_txrx_word_fn)(struct spi_device *, unsigned int, u32, u8, unsigned int);
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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_controller *ctlr;
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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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spi_bb_txrx_word_fn txrx_word[SPI_MODE_X_MASK + 1];
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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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