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- /*
- * 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
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