// SPDX-License-Identifier: GPL-2.0-only

#include <linux/export.h>
#include <linux/limits.h>
#include <linux/minmax.h>
#include <linux/module.h>

#include <drm/drm_print.h>

#include "drm_sysfb_helper.h"

int drm_sysfb_get_validated_int(struct drm_device *dev, const char *name,
                                u64 value, u32 max)
{
        if (value > min(max, INT_MAX)) {
                drm_warn(dev, "%s of %llu exceeds maximum of %u\n", name, value, max);
                return -EINVAL;
        }
        return value;
}
EXPORT_SYMBOL(drm_sysfb_get_validated_int);

int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
                                 u64 value, u32 max)
{
        if (!value) {
                drm_warn(dev, "%s of 0 not allowed\n", name);
                return -EINVAL;
        }
        return drm_sysfb_get_validated_int(dev, name, value, max);
}
EXPORT_SYMBOL(drm_sysfb_get_validated_int0);

const struct drm_format_info *drm_sysfb_get_format(struct drm_device *dev,
                                                   const struct drm_sysfb_format *formats,
                                                   size_t nformats,
                                                   const struct pixel_format *pixel)
{
        const struct drm_format_info *format = NULL;
        size_t i;

        for (i = 0; i < nformats; ++i) {
                const struct drm_sysfb_format *f = &formats[i];

                if (pixel_format_equal(pixel, &f->pixel)) {
                        format = drm_format_info(f->fourcc);
                        break;
                }
        }

        if (!format)
                drm_warn(dev, "No compatible color format found\n");

        return format;
}
EXPORT_SYMBOL(drm_sysfb_get_format);

MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
MODULE_LICENSE("GPL");