On Thu, May 16, 2019 at 02:49:45PM +0100, Ernest Esene wrote: > On Wed, May 15, 2019 at 03:17:12PM +0100, Stefan Hajnoczi wrote: > > On Fri, May 10, 2019 at 07:04:10PM +0100, Ernest Esene wrote: > > > Add support for Linux I2C character device for I2C device passthrough > > > For example: > > > -chardev i2c,address=0x46,path=/dev/i2c-N,id=i2c-chardev > > > > > > QEMU supports emulation of I2C devices in software but currently can't > > > passthrough to real I2C devices. This feature is needed by developers > > > using QEMU for writing and testing software for I2C devices. > > > > > > Signed-off-by: Ernest Esene <erok...@gmail.com> > > > > How is -chardev i2c meant to be used? Do you have code to connect this > > new chardev type to an emulated I2C bus? > It is meant to be connected to emulated I2C bus as you've stated, but I > don't have the code yet.
I'd like to see that code first, especially if it uses the chardev ioctl to perform operations other than just read/write. That could influence the design of chardev-i2c. Please keep this patch out-of-tree unless someone has an immediate use for it. If it gets merged too early (especially if a QEMU release is made), then it's difficult to change the command-line interface if changes are required to make it work with the I2C emulation. Stefan
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