drm_sysfb.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2
 3#include <linux/export.h>
 4#include <linux/limits.h>
 5#include <linux/minmax.h>
 6#include <linux/module.h>
 7
 8#include <drm/drm_print.h>
 9
10#include "drm_sysfb_helper.h"
11
12int drm_sysfb_get_validated_int(struct drm_device *dev, const char *name,
13				u64 value, u32 max)
14{
15	if (value > min(max, INT_MAX)) {
16		drm_warn(dev, "%s of %llu exceeds maximum of %u\n", name, value, max);
17		return -EINVAL;
18	}
19	return value;
20}
21EXPORT_SYMBOL(drm_sysfb_get_validated_int);
22
23int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
24				 u64 value, u32 max)
25{
26	if (!value) {
27		drm_warn(dev, "%s of 0 not allowed\n", name);
28		return -EINVAL;
29	}
30	return drm_sysfb_get_validated_int(dev, name, value, max);
31}
32EXPORT_SYMBOL(drm_sysfb_get_validated_int0);
33
34MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
35MODULE_LICENSE("GPL");