1/*
2 * Simulate a SPI port and clients (see doc/arch/sandbox.rst for details)
3 *
4 * Copyright (c) 2011-2013 The Chromium OS Authors.
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11#ifndef __ASM_SPI_H__
12#define __ASM_SPI_H__
13
14#include <linux/types.h>
15
16/*
17 * The interface between the SPI bus and the SPI client.  The bus will
18 * instantiate a client, and that then call into it via these entry
19 * points.  These should be enough for the client to emulate the SPI
20 * device just like the real hardware.
21 */
22struct sandbox_spi_emu_ops {
23	/* The bus wants to instantiate a new client, so setup everything */
24	int (*setup)(void **priv, const char *spec);
25	/* The bus is done with us, so break things down */
26	void (*free)(void *priv);
27	/* The CS has been "activated" -- we won't worry about low/high */
28	void (*cs_activate)(void *priv);
29	/* The CS has been "deactivated" -- we won't worry about low/high */
30	void (*cs_deactivate)(void *priv);
31	/* The client is rx-ing bytes from the bus, so it should tx some */
32	int (*xfer)(void *priv, const u8 *rx, u8 *tx, uint bytes);
33};
34
35#endif
36