// SPDX-License-Identifier: GPL-2.0
/*
 * UCSI debugfs interface
 *
 * Copyright (C) 2023 Intel Corporation
 *
 * Authors: Rajaram Regupathy <rajaram.regupathy@intel.com>
 *          Gopal Saranya <saranya.gopal@intel.com>
 */
#include <linux/debugfs.h>
#include <linux/hex.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/usb.h>

#include <asm/errno.h>

#include "ucsi.h"

static struct dentry *ucsi_debugfs_root;

static int ucsi_cmd(void *data, u64 val)
{
        struct ucsi *ucsi = data;
        int ret;

        memset(&ucsi->debugfs->response, 0, sizeof(ucsi->debugfs->response));
        ucsi->debugfs->status = 0;

        switch (UCSI_COMMAND(val)) {
        case UCSI_SET_CCOM:
        case UCSI_SET_UOR:
        case UCSI_SET_PDR:
        case UCSI_CONNECTOR_RESET:
        case UCSI_SET_SINK_PATH:
        case UCSI_SET_NEW_CAM:
        case UCSI_SET_USB:
        case UCSI_SET_POWER_LEVEL:
        case UCSI_READ_POWER_LEVEL:
                ret = ucsi_send_command(ucsi, val, NULL, 0);
                break;
        case UCSI_GET_CAPABILITY:
        case UCSI_GET_CONNECTOR_CAPABILITY:
        case UCSI_GET_ALTERNATE_MODES:
        case UCSI_GET_CAM_SUPPORTED:
        case UCSI_GET_CURRENT_CAM:
        case UCSI_GET_PDOS:
        case UCSI_GET_CABLE_PROPERTY:
        case UCSI_GET_CONNECTOR_STATUS:
        case UCSI_GET_ERROR_STATUS:
        case UCSI_GET_PD_MESSAGE:
        case UCSI_GET_ATTENTION_VDO:
        case UCSI_GET_CAM_CS:
        case UCSI_GET_LPM_PPM_INFO:
                ret = ucsi_send_command(ucsi, val,
                                        &ucsi->debugfs->response,
                                        sizeof(ucsi->debugfs->response));
                break;
        default:
                ret = -EOPNOTSUPP;
        }

        if (ret < 0) {
                ucsi->debugfs->status = ret;
                return ret;
        }

        return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucsi_cmd_fops, NULL, ucsi_cmd, "0x%llx\n");

static int ucsi_resp_show(struct seq_file *s, void *not_used)
{
        struct ucsi *ucsi = s->private;

        if (ucsi->debugfs->status)
                return ucsi->debugfs->status;

        seq_printf(s, "0x%016llx%016llx\n", ucsi->debugfs->response.high,
                   ucsi->debugfs->response.low);
        return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_resp);

static int ucsi_peak_curr_show(struct seq_file *m, void *v)
{
        struct ucsi *ucsi = m->private;

        seq_printf(m, "%u mA\n", ucsi->connector->peak_current);
        return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_peak_curr);

static int ucsi_avg_curr_show(struct seq_file *m, void *v)
{
        struct ucsi *ucsi = m->private;

        seq_printf(m, "%u mA\n", ucsi->connector->avg_current);
        return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_avg_curr);

static int ucsi_vbus_volt_show(struct seq_file *m, void *v)
{
        struct ucsi *ucsi = m->private;

        seq_printf(m, "%u mV\n", ucsi->connector->vbus_voltage);
        return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_vbus_volt);

void ucsi_debugfs_register(struct ucsi *ucsi)
{
        ucsi->debugfs = kzalloc_obj(*ucsi->debugfs);
        if (!ucsi->debugfs)
                return;

        ucsi->debugfs->dentry = debugfs_create_dir(dev_name(ucsi->dev), ucsi_debugfs_root);
        debugfs_create_file("command", 0200, ucsi->debugfs->dentry, ucsi, &ucsi_cmd_fops);
        debugfs_create_file("response", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_resp_fops);
        debugfs_create_file("peak_current", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_peak_curr_fops);
        debugfs_create_file("avg_current", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_avg_curr_fops);
        debugfs_create_file("vbus_voltage", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_vbus_volt_fops);
}

void ucsi_debugfs_unregister(struct ucsi *ucsi)
{
        if (IS_ERR_OR_NULL(ucsi) || !ucsi->debugfs)
                return;

        debugfs_remove_recursive(ucsi->debugfs->dentry);
        kfree(ucsi->debugfs);
}

void ucsi_debugfs_init(void)
{
        ucsi_debugfs_root = debugfs_create_dir("ucsi", usb_debug_root);
}

void ucsi_debugfs_exit(void)
{
        debugfs_remove(ucsi_debugfs_root);
}