Hi, On Wed, 19 Apr 2023 at 20:33, skyo...@126.com <skyo...@126.com> wrote: > > hi, > For i2c interface keyboard, how should we implement u-boot driver? > > Do you have any suggestions
Please try to avoid top posting. See below. > > > ________________________________ > skyo...@126.com > > > From: Simon Glass > Date: 2023-04-19 09:45 > To: skyo...@126.com > CC: u-boot > Subject: Re: The u-boot supports i2c-over-hid? > Hi, > > +Heinrich Schuchardt +Heiko Schocher > > On Thu, 13 Apr 2023 at 08:58, skyo...@126.com <skyo...@126.com> wrote: > > > > Hello, > > I would like to ask whether i2c-over-hid is not supported under u-boot > > at present. At present, we have this development need. I would like to ask > > whether it is feasible to transplant i2c-over-hid from kernel. If not, is > > there any other way? > > > > I don't see any support for it. Yes, bringing things in from Linux is > a common approach. Some changes are needed for driver model and some > differing APIs. Do you mean HID over I2C? I cannot see anything for the other way around. But for i2c over hid, see cros_ec_i2c.c which implements I2C over a Chromium OS EC interface. For HID over I2C, you could start with a simple driver which uses I2C to communicate with the device. It would need a new uclass, so it can be a proper driver. For plumbing it into U-Boot, keyboard-uclass.c shows how this is done today. Regards, Simon