linux-imx

/*

 * cros_ec_dev - expose the Chrome OS Embedded Controller to user-space

 *

 * Copyright (C) 2014 Google, Inc.

 *

 * 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/>.

 */

​

#include <linux/fs.h>

#include <linux/mfd/core.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

​

#include "cros_ec_dev.h"

​

#define DRV_NAME "cros-ec-dev"

​

/* Device variables */

#define CROS_MAX_DEV 128

static int ec_major;

​

static struct class cros_class = {

    .owner          = THIS_MODULE,

    .name           = "chromeos",

};

​

/* Basic communication */

static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)

{

    struct ec_response_get_version *resp;

    static const char * const current_image_name[] = {

        "unknown", "read-only", "read-write", "invalid",

    };

    struct cros_ec_command *msg;

    int ret;

​

    msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);

    if (!msg)

        return -ENOMEM;

​

    msg->version = 0;

    msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;

    msg->insize = sizeof(*resp);

    msg->outsize = 0;

​

    ret = cros_ec_cmd_xfer(ec->ec_dev, msg);

    if (ret < 0)