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/*
* Copyright © 2018 IBM Corporation
* This file is part of FbTerm.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "fbconfig.h"
#include "fbshm.h"
int FbShm::parse_shm_desc(const char *desc, char **file,
int *rows, int *cols, int *bpp)
{
char *str, *sep, *endp;
unsigned long tmp;
str = strdup(desc);
/* <file>:<cols>x<rows>@<bpp> */
/* file */
sep = strchr(str, ':');
if (!sep)
goto err_free;
*file = str;
*sep = '\0';
/* cols */
str = sep + 1;
sep = strchr(str, 'x');
if (!sep) {
fprintf(stderr, "can't parse shm descriptor %s: no geom\n",
desc);
goto err_free;
}
*sep = '\0';
tmp = strtoul(str, &endp, 10);
if (endp != sep) {
fprintf(stderr,
"can't parse shm descriptor %s: invalid cols %s\n",
desc, str);
goto err_free;
}
*cols = (int)(tmp & 0xffffffff);
/* rows */
str = sep + 1;
sep = strchr(str, '@');
if (!sep) {
fprintf(stderr, "can't parse shm descriptor %s: no geom\n",
desc);
goto err_free;
}
*sep = '\0';
tmp = strtoul(str, &endp, 10);
if (endp != sep) {
fprintf(stderr,
"can't parse shm descriptor %s: invalid rows %s\n",
desc, str);
goto err_free;
}
*rows = (int)(tmp & 0xffffffff);
/* bpp */
tmp = strtoul(sep + 1, &endp, 10);
if (*endp != '\0' || endp == str) {
fprintf(stderr,
"can't parse shm descriptor %s: invalid bpp\n",
desc);
goto err_free;
}
*bpp = (int)(tmp & 0xff);
printf("%s: rows %d, cols %d, bpp %d\n", *file, *rows, *cols, *bpp);
return 0;
err_free:
free(str);
return -1;
}
FbShm *FbShm::initFbShm()
{
int rows, cols, bpp;
s8 *file, desc[4096];
int fd;
Config::instance()->getOption("shared-mem", desc, sizeof(desc));
if (!strlen(desc))
return 0;
if (parse_shm_desc(desc, &file, &rows, &cols, &bpp))
return 0;
fd = open(file, O_RDWR);
if (fd < 0) {
fprintf(stderr, "can't open frame buffer shm %s: %m\n", file);
free(file);
return 0;
}
free(file);
return new FbShm(fd, rows, cols, bpp);
}
FbShm::FbShm(int fd, int rows, int cols, int bpp)
{
mWidth = cols;
mHeight = rows;
mBitsPerPixel = bpp;
mBytesPerLine = cols * (bpp >> 3);
mFD = fd;
mVMemBase = (u8 *)mmap(0, mHeight * mBytesPerLine,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
}
FbShm::~FbShm()
{
munmap(mVMemBase, mHeight * mBytesPerLine);
close(mFD);
}
const s8 *FbShm::drvId()
{
return "shm";
}
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