I have a problem writing application using uio subsystem.
As described at http://www.kernel.org/doc/htmldocs/uio-howto.html#uio_pci_generic, I bind my device to uio. Files in /sys/class/uio/uio0/ appears, dmesg say no problems.
But when I trying to mmap regions of device file /sys/class/uio/uio0/.../mapX not created.
A mmap part of code:
uint32_t UioMap(int devnum, int map_num)
{
char *u = (char *) calloc(64, 1);
sprintf(u, "/sys/class/uio/uio%d/device/resource%d", devnum, map_num);
int fd = open(u, O_RDONLY);
if(fd < 0)
{
fprintf(stderr,"Error on open!\n");
return NULL;
}
else fprintf(stderr,"fd = %d\n", fd);
void* map_addr = mmap(NULL,
0x800000,
PROT_READ,
MAP_SHARED,
fd,
map_num * getpagesize());
if(map_addr == MAP_FAILED)
{
perror("mmap");
}
free(u);
return (uint32_t *) map_addr;
}
Is there any examples of usage uio_pci_generic in realworld?
--
Dmitriy
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