ua1zbe
/
rpitx
mirror of https://github.com/F5OEO/rpitx
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Mailbox kernel compatible

This commit is contained in:
F5OEO 2015-12-18 08:43:06 +00:00
parent f06cd74efa
commit 1dd236753c
2 changed files with 28 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
src/mailbox.c
View File

@ -34,6 +34,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdint.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include "mailbox.h"
@ -246,18 +247,28 @@ unsigned execute_qpu(int file_desc, unsigned num_qpus, unsigned control, unsigne
int mbox_open() {
int file_desc;
// open a char device file used for communicating with kernel mbox driver
file_desc = open(VCIO_DEVICE_FILE_NAME, 0);
if (file_desc < 0) {
printf("Can't open device file: %s\n", CUSTOM_DEVICE_FILE_NAME);
printf("Try %s\n", CUSTOM_DEVICE_FILE_NAME);
file_desc = open(CUSTOM_DEVICE_FILE_NAME, 0);
if (file_desc < 0) {
printf("Can't open device file: %s\n", CUSTOM_DEVICE_FILE_NAME);
printf("Try creating a device file with: sudo mknod %s c %d 0\n", CUSTOM_DEVICE_FILE_NAME, MAJOR_NUM);
exit(-1);
}
}
// Open a char device file used for communicating with kernel mbox driver.
file_desc = open(VCIO_DEVICE_FILE_NAME, 0);
if(file_desc >= 0) {
printf("Using mbox device " VCIO_DEVICE_FILE_NAME ".\n");
return file_desc;
}
// Try to create one
unlink(LOCAL_DEVICE_FILE_NAME);
if(mknod(LOCAL_DEVICE_FILE_NAME, S_IFCHR|0600, makedev(MAJOR_NUM_A, 0)) >= 0 &&
(file_desc = open(LOCAL_DEVICE_FILE_NAME, 0)) >= 0) {
printf("Using local mbox device file with major %d.\n", MAJOR_NUM_A);
return file_desc;
}
unlink(LOCAL_DEVICE_FILE_NAME);
if(mknod(LOCAL_DEVICE_FILE_NAME, S_IFCHR|0600, makedev(MAJOR_NUM_B, 0)) >= 0 &&
(file_desc = open(LOCAL_DEVICE_FILE_NAME, 0)) >= 0) {
printf("Using local mbox device file with major %d.\n", MAJOR_NUM_B);
return file_desc;
}
return file_desc;
}

8
src/mailbox.h
View File

@ -26,10 +26,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/ioctl.h>
// Newer kernels (>= 4.1) use major 249, older ones major 100.
#define MAJOR_NUM_A 249
#define MAJOR_NUM_B 100
#define IOCTL_MBOX_PROPERTY _IOWR(MAJOR_NUM_B, 0, char *)
#define MAJOR_NUM 100
#define IOCTL_MBOX_PROPERTY _IOWR(MAJOR_NUM, 0, char *)
#define CUSTOM_DEVICE_FILE_NAME "/dev/rpidatv-mb"
#define LOCAL_DEVICE_FILE_NAME "/dev/rpidatv-mb"
#define VCIO_DEVICE_FILE_NAME "/dev/vcio"
int mbox_open();