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dm: mei: add sysfs read functions

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mei requires reading of u8, u32 and uuid
sysfs files.

Tracked-On: #1536
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Tomas Winkler 2018-10-15 23:41:09 +03:00 committed by wenlingz
parent b8d53d17d5
commit 0dc7adfbac
1 changed files with 75 additions and 0 deletions
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75
devicemodel/hw/pci/virtio/virtio_mei.c
View File

@ -41,6 +41,12 @@
#include "mei.h"
#ifndef BIT
#define BIT(x) (1 << (x))
#endif
#define DEV_NAME_SIZE sizeof(((struct dirent *)0)->d_name)
#ifndef UUID_STR_LEN
#define UUID_STR_LEN 37
#endif
@ -146,3 +152,72 @@ refcnt_put(const struct refcnt *ref)
if (__sync_sub_and_fetch((int *)&ref->count, 1) == 0)
ref->destroy(ref);
}
static int mei_sysfs_read_property_file(const char *fname, char *buf, size_t sz)
{
int fd;
int rc;
if (!buf)
return -EINVAL;
if (!sz)
return 0;
fd = open(fname, O_RDONLY);
if (fd < 0) {
DPRINTF("open failed %s %d\n", fname, errno);
return -1;
}
rc = read(fd, buf, sz);
close(fd);
return rc;
}
static int mei_sysfs_read_property_u8(const char *fname, uint8_t *u8_property)
{
char buf[4] = {0};
unsigned long int res;
if (mei_sysfs_read_property_file(fname, buf, sizeof(buf) - 1) < 0)
return -1;
res = strtoul(buf, NULL, 10);
if (res >= 256)
return -1;
*u8_property = (uint8_t)res;
return 0;
}
static int mei_sysfs_read_property_u32(const char *fname,
uint32_t *u32_property)
{
char buf[32] = {0};
unsigned long int res;
if (mei_sysfs_read_property_file(fname, buf, sizeof(buf) - 1) < 0)
return -1;
res = strtoul(buf, NULL, 10);
if (res == ULONG_MAX)
return -1;
*u32_property = res;
return 0;
}
static int mei_sysfs_read_property_uuid(char *fname, guid_t *uuid)
{
char buf[UUID_STR_LEN] = {0};
if (mei_sysfs_read_property_file(fname, buf, sizeof(buf) - 1) < 0)
return -1;
return guid_parse(buf, sizeof(buf), uuid);
}