68 lines
2.1 KiB
C

/*
* cros_ec_dev - expose the Chrome OS Embedded Controller to userspace
*
* Copyright (C) 2013 The Chromium OS Authors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#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: Max number of bytes to accept from EC
* @result: EC's response to the command (separate from communication failure)
* ioctl returns the number of bytes returned from the EC, 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_ */