i.MX Processorsのトピックaccess error i2c device file

access error i2c device file

janmennen — Wed, 11 Sep 2019 12:02:50 GMT

I get EACCESS error when opening i2c-2 device file when using Android-NDK build and called via JNI

When using i2c tools i don't have this problem.

int i2cbus = 2;
sprintf(fileName, "/dev/i2c-%d", i2cbus);

if ((file = open(fileName,O_RDWR)) < 0) {
    LOGE("Error opening %s file=%d error=%d", fileName, file, errno);
    if (errno == EACCES) LOGE("Run as root?\n");
    return -1;
}

Seems i have to change the access rights of the device file. How to do this permanently. When i do chmod 666 setting is changed but after reboot it is getting its old value.

Does someone knows how to solve this issue

Thanks Jan

Re: access error i2c device file

jimmychan — Thu, 12 Sep 2019 08:28:04 GMT

This may help you android - AOSP device node access permissions - Stack Overflow

Re: access error i2c device file

janmennen — Mon, 16 Sep 2019 13:47:08 GMT

Problem is related to security mode avc: denied kernel error

When i enable permissive mode the problem is solved see:

https://source.android.com/security/selinux

androidboot.selinux=permissive