1 /* $OpenBSD: spivar.h,v 1.1 2018/07/26 10:59:07 patrick Exp $ */ 2 /* 3 * Copyright (c) 2018 Patrick Wildt <patrick@blueri.se> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 struct spi_config { 19 int sc_cs; 20 int sc_flags; 21 #define SPI_CONFIG_CPOL (1 << 0) 22 #define SPI_CONFIG_CPHA (1 << 1) 23 #define SPI_CONFIG_CS_HIGH (1 << 2) 24 int sc_bpw; 25 uint32_t sc_freq; 26 }; 27 28 typedef struct spi_controller { 29 void *sc_cookie; 30 void (*sc_config)(void *, struct spi_config *); 31 int (*sc_transfer)(void *, char *, char *, int); 32 int (*sc_acquire_bus)(void *, int); 33 void (*sc_release_bus)(void *, int); 34 } *spi_tag_t; 35 36 struct spi_attach_args { 37 spi_tag_t sa_tag; 38 char *sa_name; 39 void *sa_cookie; 40 }; 41 42 #define spi_config(sc, config) \ 43 (*(sc)->sc_config)((sc)->sc_cookie, (config)) 44 #define spi_read(sc, data, len) \ 45 (*(sc)->sc_transfer)((sc)->sc_cookie, NULL, (data), (len)) 46 #define spi_write(sc, data, len) \ 47 (*(sc)->sc_transfer)((sc)->sc_cookie, (data), NULL, (len)) 48 #define spi_transfer(sc, out, in, len) \ 49 (*(sc)->sc_transfer)((sc)->sc_cookie, (out), (in), (len)) 50 #define spi_acquire_bus(sc, flags) \ 51 (*(sc)->sc_acquire_bus)((sc)->sc_cookie, (flags)) 52 #define spi_release_bus(sc, flags) \ 53 (*(sc)->sc_release_bus)((sc)->sc_cookie, (flags)) 54