/*
* Copyright 2012 Red Hat Inc .
*
* Permission is hereby granted , free of charge , to any person obtaining a
* copy of this software and associated documentation files ( the " Software " ) ,
* to deal in the Software without restriction , including without limitation
* the rights to use , copy , modify , merge , publish , distribute , sublicense ,
* and / or sell copies of the Software , and to permit persons to whom the
* Software is furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software .
*
* THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL
* THE COPYRIGHT HOLDER ( S ) OR AUTHOR ( S ) BE LIABLE FOR ANY CLAIM , DAMAGES OR
* OTHER LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE ,
* ARISING FROM , OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE .
*
* Authors : Ben Skeggs
*/
#include "mxms.h"
#define ROM16(x) get_unaligned_le16(&(x))
#define ROM32(x) get_unaligned_le32(&(x))
static u8 *
mxms_data(struct nvkm_mxm *mxm)
{
return mxm->mxms;
}
u16
mxms_version(struct nvkm_mxm *mxm)
{
u8 *mxms = mxms_data(mxm);
u16 version = (mxms[4 ] << 8 ) | mxms[5 ];
switch (version ) {
case 0 x0200:
case 0 x0201:
case 0 x0300:
return version;
default :
break ;
}
nvkm_debug(&mxm->subdev, "unknown version %d.%d\n" , mxms[4 ], mxms[5 ]);
return 0 x0000;
}
u16
mxms_headerlen(struct nvkm_mxm *mxm)
{
return 8 ;
}
u16
mxms_structlen(struct nvkm_mxm *mxm)
{
return *(u16 *)&mxms_data(mxm)[6 ];
}
bool
mxms_checksum(struct nvkm_mxm *mxm)
{
u16 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
u8 *mxms = mxms_data(mxm), sum = 0 ;
while (size--)
sum += *mxms++;
if (sum) {
nvkm_debug(&mxm->subdev, "checksum invalid\n" );
return false ;
}
return true ;
}
bool
mxms_valid(struct nvkm_mxm *mxm)
{
u8 *mxms = mxms_data(mxm);
if (*(u32 *)mxms != 0 x5f4d584d) {
nvkm_debug(&mxm->subdev, "signature invalid\n" );
return false ;
}
if (!mxms_version(mxm) || !mxms_checksum(mxm))
return false ;
return true ;
}
bool
mxms_foreach(struct nvkm_mxm *mxm, u8 types,
bool (*exec)(struct nvkm_mxm *, u8 *, void *), void *info)
{
struct nvkm_subdev *subdev = &mxm->subdev;
u8 *mxms = mxms_data(mxm);
u8 *desc = mxms + mxms_headerlen(mxm);
u8 *fini = desc + mxms_structlen(mxm) - 1 ;
while (desc < fini) {
u8 type = desc[0 ] & 0 x0f;
u8 headerlen = 0 ;
u8 recordlen = 0 ;
u8 entries = 0 ;
switch (type) {
case 0 : /* Output Device Structure */
if (mxms_version(mxm) >= 0 x0300)
headerlen = 8 ;
else
headerlen = 6 ;
break ;
case 1 : /* System Cooling Capability Structure */
case 2 : /* Thermal Structure */
case 3 : /* Input Power Structure */
headerlen = 4 ;
break ;
case 4 : /* GPIO Device Structure */
headerlen = 4 ;
recordlen = 2 ;
entries = (ROM32(desc[0 ]) & 0 x01f00000) >> 20 ;
break ;
case 5 : /* Vendor Specific Structure */
headerlen = 8 ;
break ;
case 6 : /* Backlight Control Structure */
if (mxms_version(mxm) >= 0 x0300) {
headerlen = 4 ;
recordlen = 8 ;
entries = (desc[1 ] & 0 xf0) >> 4 ;
} else {
headerlen = 8 ;
}
break ;
case 7 : /* Fan Control Structure */
headerlen = 8 ;
recordlen = 4 ;
entries = desc[1 ] & 0 x07;
break ;
default :
nvkm_debug(subdev, "unknown descriptor type %d\n" , type);
return false ;
}
if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
static const char * mxms_desc[] = {
"ODS" , "SCCS" , "TS" , "IPS" ,
"GSD" , "VSS" , "BCS" , "FCS" ,
};
u8 *dump = desc;
char data[32 ], *ptr;
int i, j;
for (j = headerlen - 1 , ptr = data; j >= 0 ; j--)
ptr += sprintf(ptr, "%02x" , dump[j]);
dump += headerlen;
nvkm_debug(subdev, "%4s: %s\n" , mxms_desc[type], data);
for (i = 0 ; i < entries; i++, dump += recordlen) {
for (j = recordlen - 1 , ptr = data; j >= 0 ; j--)
ptr += sprintf(ptr, "%02x" , dump[j]);
nvkm_debug(subdev, " %s\n" , data);
}
}
if (types & (1 << type)) {
if (!exec(mxm, desc, info))
return false ;
}
desc += headerlen + (entries * recordlen);
}
return true ;
}
void
mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
{
u64 data = ROM32(pdata[0 ]);
if (mxms_version(mxm) >= 0 x0300)
data |= (u64)ROM16(pdata[4 ]) << 32 ;
desc->outp_type = (data & 0 x00000000000000f0ULL) >> 4 ;
desc->ddc_port = (data & 0 x0000000000000f00ULL) >> 8 ;
desc->conn_type = (data & 0 x000000000001f000ULL) >> 12 ;
desc->dig_conn = (data & 0 x0000000000780000ULL) >> 19 ;
}
Messung V0.5 in Prozent C=96 H=88 G=91
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-06)
¤
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