| /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* SPI interface for Chrome EC */ |
| |
| #ifndef __CROS_EC_SPI_H |
| #define __CROS_EC_SPI_H |
| |
| /* Enable / disable the SPI port. When the port is disabled, all its I/O lines |
| * are high-Z so the EC won't interfere with other devices on the SPI bus. */ |
| int spi_enable(int enable); |
| |
| /* Issue a SPI transaction. Assumes SPI port has already been enabled. |
| * Transmits <txlen> bytes from <txdata>, throwing away the corresponding |
| * received data, then transmits <rxlen> dummy bytes, saving the received data |
| * in <rxdata>. */ |
| int spi_transaction(const uint8_t *txdata, int txlen, |
| uint8_t *rxdata, int rxlen); |
| |
| #endif /* __CROS_EC_SPI_H */ |