freebsd-dev/sys/dev/spibus/spi.h
Adrian Chadd d67fe28ba6 [spigen] add initial spigen driver from green@
This is a simple ioctl and mmap API to issue SPI transactions from
userland.  It's useful for simple devices (eg spi temperature sensors,
etc) for experimentation.

TODO:

* Write some documentation!

Submitted by:	green
2016-05-26 07:02:20 +00:00

43 lines
1.6 KiB
C

/*-
* Copyright (c) 2006 M. Warner Losh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
struct spi_command {
void *tx_cmd;
uint32_t tx_cmd_sz;
void *rx_cmd;
uint32_t rx_cmd_sz;
void *tx_data;
uint32_t tx_data_sz;
void *rx_data;
uint32_t rx_data_sz;
};
#define SPI_COMMAND_INITIALIZER { 0 }
#define SPI_CHIP_SELECT_HIGH 0x1 /* Chip select high (else low) */