/* $OpenBSD: spivar.h,v 1.3 2025/11/14 01:55:07 jcs Exp $ */
/*
 * Copyright (c) 2018 Patrick Wildt <patrick@blueri.se>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _DEV_SPI_SPIVAR_H_
#define _DEV_SPI_SPIVAR_H_

struct spi_config {
        int              sc_cs;
        int              sc_flags;
#define SPI_CONFIG_CPOL         (1 << 0)
#define SPI_CONFIG_CPHA         (1 << 1)
#define SPI_CONFIG_CS_HIGH      (1 << 2)
        int              sc_bpw;
        uint32_t         sc_freq;
        u_int            sc_cs_delay;
};

#define SPI_KEEP_CS             (1 << 0)

typedef struct spi_controller {
        void            *sc_cookie;
        void            (*sc_config)(void *, struct spi_config *);
        int             (*sc_transfer)(void *, char *, char *, int, int);
        int             (*sc_acquire_bus)(void *, int);
        void            (*sc_release_bus)(void *, int);
} *spi_tag_t;

struct spi_attach_args {
        spi_tag_t        sa_tag;
        char            *sa_name;
        void            *sa_cookie;
};

#define spi_config(sc, config)                                          \
        (*(sc)->sc_config)((sc)->sc_cookie, (config))
#define spi_read(sc, data, len)                                         \
        (*(sc)->sc_transfer)((sc)->sc_cookie, NULL, (data), (len), 0)
#define spi_write(sc, data, len)                                        \
        (*(sc)->sc_transfer)((sc)->sc_cookie, (data), NULL, (len), 0)
#define spi_transfer(sc, out, in, len, flags)                           \
        (*(sc)->sc_transfer)((sc)->sc_cookie, (out), (in), (len), (flags))
#define spi_acquire_bus(sc, flags)                                      \
        (*(sc)->sc_acquire_bus)((sc)->sc_cookie, (flags))
#define spi_release_bus(sc, flags)                                      \
        (*(sc)->sc_release_bus)((sc)->sc_cookie, (flags))

#endif /* _DEV_SPI_SPIVAR_H_ */