/* Copyright (c) 2013 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.
 */

#ifndef _CROS_EC_DEV_H_
#define _CROS_EC_DEV_H_

#include <linux/ioctl.h>
#include <linux/types.h>

#define CROS_EC_DEV_NAME "cros_ec"
#define CROS_EC_DEV_VERSION "1.0.0"


/*
 * @version: Command version number (often 0)
 * @command: Command to send (EC_CMD_...)
 * @outdata: Outgoing data to EC
 * @outsize: Outgoing length in bytes
 * @indata: Where to put the incoming data from EC
 * @insize: On call, how much we can accept. On return, how much we got.
 * @result: EC's response to the command (separate from communication failure)
 * ioctl returns zero on success, negative on error
 */
struct cros_ec_command {
	uint32_t version;
	uint32_t command;
	uint8_t *outdata;
	uint32_t outsize;
	uint8_t *indata;
	uint32_t insize;
	uint32_t result;
};

/*
 * @offset: within EC_LPC_ADDR_MEMMAP region
 * @bytes: number of bytes to read. zero means "read a string" (including '\0')
 *         (at most only EC_MEMMAP_SIZE bytes can be read)
 * @buffer: where to store the result
 * ioctl returns the number of bytes read, negative on error
 */
struct cros_ec_readmem {
	uint32_t offset;
	uint32_t bytes;
	char *buffer;
};

#define CROS_EC_DEV_IOC              ':'
#define CROS_EC_DEV_IOCXCMD    _IOWR(':', 0, struct cros_ec_command)
#define CROS_EC_DEV_IOCRDMEM   _IOWR(':', 1, struct cros_ec_readmem)

#endif /* _CROS_EC_DEV_H_ */