[SOLVED] USB device 'reset' trouble

[jerson]

Greetings

I have now been using mint for almost 3 years. As an embedded systems coder, I have to use various USB devices as IC flashing tools. Now, I have run into a peculiar problem that I have managed to narrow down to the Linux system.

There is a device programmer that is detected well and shows up in 'lsusb'. It can be connected to a VM guest and used correctly. However, upgrading the firmware of the same device programmer to its newer version causes a USB device error in the VM guest. Investigating further, I decided to check if I could perform a USBreset of the device from the mint command line.

I use this attached code

Code: Select all

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>


int main(int argc, char **argv)
{
    const char *filename;
    int fd;
    int rc;

    if (argc != 2) {
        fprintf(stderr, "Usage: usbreset device-filename\n");
        return 1;
    }
    filename = argv[1];

    fd = open(filename, O_WRONLY);
    if (fd < 0) {
        perror("Error opening output file");
        return 1;
    }

    printf("Resetting USB device %s\n", filename);
    rc = ioctl(fd, USBDEVFS_RESET, 0);
    if (rc < 0) {
        perror("Error in ioctl");
        return 1;
    }
    printf("Reset successful\n");

    close(fd);
    return 0;
}

What I found is that when the usb reset command is run, the program returns with a message

Resetting USB device /dev/bus/usb/003/012
Error in ioctl: No such device

There are other devices that fall in the same category. These fail when the reset command goes out to the device.

I need help to find out how this can be fixed. It is definitely an issue with the underlying USB sources of mint

[jerson]

Sorry, forgot to add that the same devices work well natively under Windows without any errors.

[jerson]

Greetings all

Realized that the specific device support under linux itself is suspect. If I command a reset to the device, it comes back with a IOCTL failure.

Question is - where do I ask this question so as to find a resolution to the problem?

Is this issue generic to all linux or only to LMint?

[jerson]

Just to be sure, it is not the OS which is creating the issue, perhaps the underlying hardware which is not supported, I tried Lubuntu 18.04 LiveCD running kernel 4.15.0-20 generic. The same device can be reset using the usbreset executable without any errors.

This problem seems specific to LM versions using kernel 4.4, 4.9. Will changing the kernel help?

[jerson]

Update. I've been able to fix the trouble by updating to the 4.15.20 kernel which worked in Lubuntu.