mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-18 16:08:53 +09:00
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
![]() |
/*
|
||
|
* Simulate a SPI port and clients (see README.sandbox for details)
|
||
|
*
|
||
|
* Copyright (c) 2011-2013 The Chromium OS Authors.
|
||
|
* See file CREDITS for list of people who contributed to this
|
||
|
* project.
|
||
|
*
|
||
|
* Licensed under the GPL-2 or later.
|
||
|
*/
|
||
|
|
||
|
#ifndef __ASM_SPI_H__
|
||
|
#define __ASM_SPI_H__
|
||
|
|
||
|
#include <linux/types.h>
|
||
|
|
||
|
/*
|
||
|
* The interface between the SPI bus and the SPI client. The bus will
|
||
|
* instantiate a client, and that then call into it via these entry
|
||
|
* points. These should be enough for the client to emulate the SPI
|
||
|
* device just like the real hardware.
|
||
|
*/
|
||
|
struct sandbox_spi_emu_ops {
|
||
|
/* The bus wants to instantiate a new client, so setup everything */
|
||
|
int (*setup)(void **priv, const char *spec);
|
||
|
/* The bus is done with us, so break things down */
|
||
|
void (*free)(void *priv);
|
||
|
/* The CS has been "activated" -- we won't worry about low/high */
|
||
|
void (*cs_activate)(void *priv);
|
||
|
/* The CS has been "deactivated" -- we won't worry about low/high */
|
||
|
void (*cs_deactivate)(void *priv);
|
||
|
/* The client is rx-ing bytes from the bus, so it should tx some */
|
||
|
int (*xfer)(void *priv, const u8 *rx, u8 *tx, uint bytes);
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Extract the bus/cs from the spi spec and return the start of the spi
|
||
|
* client spec. If the bus/cs are invalid for the current config, then
|
||
|
* it returns NULL.
|
||
|
*
|
||
|
* Example: arg="0:1:foo" will set bus to 0, cs to 1, and return "foo"
|
||
|
*/
|
||
|
const char *sandbox_spi_parse_spec(const char *arg, unsigned long *bus,
|
||
|
unsigned long *cs);
|
||
|
|
||
|
#endif
|