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edid: encode vendor & product information

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Signed-off-by: Simon Ser <contact@emersion.fr>
This commit is contained in:
Simon Ser 2023-04-21 12:05:02 +02:00
parent bed829366e
commit 76e836df7f
1 changed files with 60 additions and 0 deletions
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60
edid.c
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@ -1708,6 +1708,62 @@ error:
return NULL;
}
static bool
encode_vendor_product(const struct di_edid_vendor_product *vendor_product,
uint8_t data[static EDID_BLOCK_SIZE])
{
size_t i;
uint16_t man;
char ch;
int year;
for (i = 0; i < 3; i++) {
ch = vendor_product->manufacturer[i];
if (ch < '@' || ch > '@' + 0x1F) {
return false;
}
}
man = (uint16_t)((vendor_product->manufacturer[0] - '@') << 10) |
(uint16_t)((vendor_product->manufacturer[1] - '@') << 5) |
(uint16_t)((vendor_product->manufacturer[2] - '@') << 0);
data[0x08] = (uint8_t)(man >> 8);
data[0x09] = (uint8_t)man;
data[0x0A] = (uint8_t)vendor_product->product;
data[0x0B] = (uint8_t)(vendor_product->product >> 8);
data[0x0C] = (uint8_t)vendor_product->serial;
data[0x0D] = (uint8_t)(vendor_product->serial >> 8);
data[0x0E] = (uint8_t)(vendor_product->serial >> 16);
data[0x0F] = (uint8_t)(vendor_product->serial >> 24);
if (vendor_product->manufacture_year != 0 && vendor_product->model_year != 0) {
return false;
}
if (vendor_product->manufacture_week != 0) {
if (vendor_product->manufacture_week < 1 ||
vendor_product->manufacture_week > 54 ||
vendor_product->model_year != 0) {
return false;
}
data[0x10] = (uint8_t)vendor_product->manufacture_week;
} else {
if (vendor_product->model_year != 0) {
data[0x10] = 0xFF;
year = vendor_product->model_year;
} else {
year = vendor_product->manufacture_year;
}
if (year <= 1990 || year >= 1990 + 0xFF) {
return false;
}
data[0x11] = (uint8_t)(year - 1990);
}
return true;
}
ssize_t
di_edid_format(const struct di_edid *edid, void *buf, size_t buf_size)
{
@ -1728,6 +1784,10 @@ di_edid_format(const struct di_edid *edid, void *buf, size_t buf_size)
data[0x12] = (uint8_t) edid->version;
data[0x13] = (uint8_t) edid->revision;
if (!encode_vendor_product(&edid->vendor_product, data)) {
return -1;
}
/* TODO */
return (ssize_t) size;