vesadrm.c (683058df13c7de4cf29fb4a929d431ca12313966) vesadrm.c (6046b49bafff47726a377ef05dc55ef7dec01cbd)
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/aperture.h>
4#include <linux/ioport.h>
5#include <linux/limits.h>
6#include <linux/platform_device.h>
7#include <linux/screen_info.h>
8

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31
32#define DRIVER_NAME "vesadrm"
33#define DRIVER_DESC "DRM driver for VESA platform devices"
34#define DRIVER_MAJOR 1
35#define DRIVER_MINOR 0
36
37#define VESADRM_GAMMA_LUT_SIZE 256
38
1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/aperture.h>
4#include <linux/ioport.h>
5#include <linux/limits.h>
6#include <linux/platform_device.h>
7#include <linux/screen_info.h>
8

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31
32#define DRIVER_NAME "vesadrm"
33#define DRIVER_DESC "DRM driver for VESA platform devices"
34#define DRIVER_MAJOR 1
35#define DRIVER_MINOR 0
36
37#define VESADRM_GAMMA_LUT_SIZE 256
38
39static int vesadrm_get_validated_int(struct drm_device *dev, const char *name,
40 u64 value, u32 max)
41{
42 if (max > INT_MAX)
43 max = INT_MAX;
44 if (value > max) {
45 drm_err(dev, "%s of %llu exceeds maximum of %u\n", name, value, max);
46 return -EINVAL;
47 }
48 return value;
49}
50
51static int vesadrm_get_validated_int0(struct drm_device *dev, const char *name,
52 u64 value, u32 max)
53{
54 if (!value) {
55 drm_err(dev, "%s of 0 not allowed\n", name);
56 return -EINVAL;
57 }
58 return vesadrm_get_validated_int(dev, name, value, max);
59}
60
61static s64 vesadrm_get_validated_size0(struct drm_device *dev, const char *name,
62 u64 value, u64 max)
63{
64 if (!value) {
65 drm_err(dev, "vesadrm: %s of 0 not allowed\n", name);
66 return -EINVAL;
67 } else if (value > max) {
68 drm_err(dev, "vesadrm: %s of %llu exceeds maximum of %llu\n", name, value, max);
69 return -EINVAL;
70 }
71 return value;
72}
73
74static int vesadrm_get_width_si(struct drm_device *dev, const struct screen_info *si)
75{
39static s64 vesadrm_get_validated_size0(struct drm_device *dev, const char *name,
40 u64 value, u64 max)
41{
42 if (!value) {
43 drm_err(dev, "vesadrm: %s of 0 not allowed\n", name);
44 return -EINVAL;
45 } else if (value > max) {
46 drm_err(dev, "vesadrm: %s of %llu exceeds maximum of %llu\n", name, value, max);
47 return -EINVAL;
48 }
49 return value;
50}
51
52static int vesadrm_get_width_si(struct drm_device *dev, const struct screen_info *si)
53{
76 return vesadrm_get_validated_int0(dev, "width", si->lfb_width, U16_MAX);
54 return drm_sysfb_get_validated_int0(dev, "width", si->lfb_width, U16_MAX);
77}
78
79static int vesadrm_get_height_si(struct drm_device *dev, const struct screen_info *si)
80{
55}
56
57static int vesadrm_get_height_si(struct drm_device *dev, const struct screen_info *si)
58{
81 return vesadrm_get_validated_int0(dev, "height", si->lfb_height, U16_MAX);
59 return drm_sysfb_get_validated_int0(dev, "height", si->lfb_height, U16_MAX);
82}
83
84static struct resource *vesadrm_get_memory_si(struct drm_device *dev,
85 const struct screen_info *si,
86 struct resource *res)
87{
88 ssize_t num;
89

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100 const struct drm_format_info *format,
101 unsigned int width, unsigned int height, u64 size)
102{
103 u64 lfb_linelength = si->lfb_linelength;
104
105 if (!lfb_linelength)
106 lfb_linelength = drm_format_info_min_pitch(format, 0, width);
107
60}
61
62static struct resource *vesadrm_get_memory_si(struct drm_device *dev,
63 const struct screen_info *si,
64 struct resource *res)
65{
66 ssize_t num;
67

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78 const struct drm_format_info *format,
79 unsigned int width, unsigned int height, u64 size)
80{
81 u64 lfb_linelength = si->lfb_linelength;
82
83 if (!lfb_linelength)
84 lfb_linelength = drm_format_info_min_pitch(format, 0, width);
85
108 return vesadrm_get_validated_int0(dev, "stride", lfb_linelength, div64_u64(size, height));
86 return drm_sysfb_get_validated_int0(dev, "stride", lfb_linelength,
87 div64_u64(size, height));
109}
110
111static u64 vesadrm_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
112 unsigned int height, unsigned int stride, u64 size)
113{
114 u64 vsize = PAGE_ALIGN(height * stride);
115
116 return vesadrm_get_validated_size0(dev, "visible size", vsize, size);

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89
90static u64 vesadrm_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
91 unsigned int height, unsigned int stride, u64 size)
92{
93 u64 vsize = PAGE_ALIGN(height * stride);
94
95 return vesadrm_get_validated_size0(dev, "visible size", vsize, size);

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