linux-imx

// SPDX-License-Identifier: GPL-2.0

// ChromeOS Embedded Controller extcon

//

// Copyright (C) 2017 Google, Inc.

// Author: Benson Leung <bleung@chromium.org>

​

#include <linux/extcon-provider.h>

#include <linux/kernel.h>

#include <linux/mfd/cros_ec.h>

#include <linux/module.h>

#include <linux/notifier.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/sched.h>

​

struct cros_ec_extcon_info {

    struct device *dev;

    struct extcon_dev *edev;

​

    int port_id;

​

    struct cros_ec_device *ec;

​

    struct notifier_block notifier;

​

    unsigned int dr; /* data role */

    bool pr; /* power role (true if VBUS enabled) */

    bool dp; /* DisplayPort enabled */

    bool mux; /* SuperSpeed (usb3) enabled */

    unsigned int power_type;

};

​

static const unsigned int usb_type_c_cable[] = {

    EXTCON_USB,

    EXTCON_USB_HOST,

    EXTCON_DISP_DP,

    EXTCON_NONE,

};

​

enum usb_data_roles {

    DR_NONE,

    DR_HOST,

    DR_DEVICE,

};

​

/**

 * cros_ec_pd_command() - Send a command to the EC.

 * @info: pointer to struct cros_ec_extcon_info

 * @command: EC command

 * @version: EC command version

 * @outdata: EC command output data

 * @outsize: Size of outdata

 * @indata: EC command input data

 * @insize: Size of indata

 *

 * Return: 0 on success, <0 on failure.

 */

static int cros_ec_pd_command(struct cros_ec_extcon_info *info,

                  unsigned int command,

                  unsigned int version,

                  void *outdata,

                  unsigned int outsize,

                  void *indata,

                  unsigned int insize)

{

    struct cros_ec_command *msg;

    int ret;

​

    msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);

    if (!msg)

        return -ENOMEM;

​

    msg->version = version;

    msg->command = command;

    msg->outsize = outsize;

    msg->insize = insize;

​

    if (outsize)

        memcpy(msg->data, outdata, outsize);

​

    ret = cros_ec_cmd_xfer_status(info->ec, msg);

    if (ret >= 0 && insize)

        memcpy(indata, msg->data, insize);

​

    kfree(msg);

    return ret;

}

​

/**

 * cros_ec_usb_get_power_type() - Get power type info about PD device attached

 * to given port.