// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright (c) 2024 Hisilicon Limited.

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/seq_file.h>
#include <linux/pci.h>

#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_edid.h>

#include "hibmc_drm_drv.h"

#define MAX_BUF_SIZE 12

static ssize_t hibmc_control_write(struct file *file, const char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct hibmc_drm_private *priv = file_inode(file)->i_private;
        struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
        int ret, idx;
        u8 buf[MAX_BUF_SIZE];

        if (count >= MAX_BUF_SIZE)
                return -EINVAL;

        if (copy_from_user(buf, user_buf, count))
                return -EFAULT;

        buf[count] = '\0';

        /* Only 4 parameters is allowed, the ranger are as follow:
         * [0] enable/disable colorbar feature
               0: enable colorbar, 1: disable colorbar
         * [1] the timing source of colorbar displaying
               0: timing follows XDP, 1: internal self timing
         * [2] the movment of colorbar displaying
               0: static colorbar image,
         *     1~255: right shifting a type of color per (1~255)frames
         * [3] the color type of colorbar displaying
               0~9: color bar, white, red, orange,
         *          yellow, green, cyan, bule, pupper, black
         */
        if (sscanf(buf, "%hhu %hhu %hhu %u", &cfg->enable, &cfg->self_timing,
                   &cfg->dynamic_rate, &cfg->pattern) != 4) {
                return -EINVAL;
        }

        if (cfg->pattern > 9 || cfg->enable > 1 || cfg->self_timing > 1)
                return -EINVAL;

        ret = drm_dev_enter(&priv->dev, &idx);
        if (!ret)
                return -ENODEV;

        hibmc_dp_set_cbar(&priv->dp, cfg);

        drm_dev_exit(idx);

        return count;
}

static int hibmc_dp_dbgfs_show(struct seq_file *m, void *arg)
{
        struct hibmc_drm_private *priv = m->private;
        struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
        int idx;

        if (!drm_dev_enter(&priv->dev, &idx))
                return -ENODEV;

        seq_printf(m, "hibmc dp colorbar cfg: %u %u %u %u\n", cfg->enable, cfg->self_timing,
                   cfg->dynamic_rate, cfg->pattern);

        drm_dev_exit(idx);

        return 0;
}

static int hibmc_open(struct inode *inode, struct file *filp)
{
        return single_open(filp, hibmc_dp_dbgfs_show, inode->i_private);
}

static const struct file_operations hibmc_dbg_fops = {
        .owner   = THIS_MODULE,
        .write   = hibmc_control_write,
        .read    = seq_read,
        .open    = hibmc_open,
        .llseek  = seq_lseek,
        .release = single_release,
};

void hibmc_debugfs_init(struct drm_connector *connector, struct dentry *root)
{
        struct drm_device *dev = connector->dev;
        struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);

        /* create the file in drm directory, so we don't need to remove manually */
        debugfs_create_file("colorbar-cfg", 0200,
                            root, priv, &hibmc_dbg_fops);
}