On Sun, Mar 22, 2020 at 03:40:33PM -0400, Ryan Lovelett wrote: > I have been trying to find a way to get my Adafruit FT232H breakout > board [1] to appear as a user space GPIO device so I can use it with > libgpiod. As far as I can tell from reading table 3.5 from the > datasheet [2] ACBUS5, ACBUS6, ACBUS8 and ACBUS9 should all be usable > for this. > > I found a patch that was submitted by Karoly Pados in 2018 [3] that > seemes to add support for that (though maybe only for a specific chip). > > Through a little bit of ftrace and printk I realized that the switch > statement in ftdi_gpio_init was falling through to the default case for > the FT232H [4]. So it sounds like you have the wrong device type. Can you make sure you use the latest kernel release (5.5) and if you have problems with this, email the linux-usb mailing list as the driver maintainers for that driver are there. thanks, greg k-h
