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/* $OpenBSD: spivar.h,v 1.1 2018/07/26 10:59:07 patrick 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.
*/
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;
};
typedef struct spi_controller {
void *sc_cookie;
void (*sc_config)(void *, struct spi_config *);
int (*sc_transfer)(void *, char *, char *, 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))
#define spi_write(sc, data, len) \
(*(sc)->sc_transfer)((sc)->sc_cookie, (data), NULL, (len))
#define spi_transfer(sc, out, in, len) \
(*(sc)->sc_transfer)((sc)->sc_cookie, (out), (in), (len))
#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))
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