Hi all, In my userspace driver for a temp sensor on a i2c bus, i am using the /dev interface. When i use plain read/write syscalls , they seem to work just fine. But when i use a combined read/write using the IOCTL "I2C_RDWR", i get a return of invalid argument i.e EINVAL from the kernel space i2c dev/bus driver. int rest = ioctl(_fd, I2C_RDWR, trans ); So basically res gets a value<1 on execution. I am putting in the correct slave address. i have double checked on it. What could be the other obvious reasons? Could endian ness be an issue as well although the userspace is really invisible and if that had been the case i would not have got acks from the slave for a i2c scan on the bus. i checked the kernel bus driver code for the reason, but cannot figure out just by reading the code at this point as i have a broken h/w. iam using the freescale mxc i2c bus driver on the kernel side. Any clues? Thanks in advance. -Alfred. -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
