Date: Sun, 24 Jul 2016 13:12:35 -0600 From: Ian Lepore <ian@freebsd.org> To: Warner Losh <imp@bsdimp.com>, Kevin Oberman <rkoberman@gmail.com> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org>, "O. Hartmann" <ohartman@zedat.fu-berlin.de>, "freebsd-usb@FreeBSD.org" <freebsd-usb@freebsd.org> Subject: Re: Digi Watchport/T temperature sensor as /dev/ttyU Message-ID: <1469387555.84197.48.camel@freebsd.org> In-Reply-To: <CANCZdfoVnZHmmvNcrJgaZ2k8o6e150LGFa0svufgodn6jeJu0Q@mail.gmail.com> References: <20160722183556.2fc39fd7.ohartman@zedat.fu-berlin.de> <1469206374.84197.14.camel@freebsd.org> <20160723220430.34ce02fe.ohartman@zedat.fu-berlin.de> <1469306951.84197.31.camel@freebsd.org> <20160724080330.3a27e875.ohartman@zedat.fu-berlin.de> <20160724083859.4c0dd392@ernst.home> <20160724105134.184f0b7f.ohartman@zedat.fu-berlin.de> <1469379334.84197.40.camel@freebsd.org> <CAN6yY1tUg0GeNn6hkO9NPKyKO2z58erzOYT3PkYSQ1yiX0t0Gg@mail.gmail.com> <CANCZdfoVnZHmmvNcrJgaZ2k8o6e150LGFa0svufgodn6jeJu0Q@mail.gmail.com>
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On Sun, 2016-07-24 at 12:52 -0600, Warner Losh wrote: > On Sun, Jul 24, 2016 at 12:42 PM, Kevin Oberman <rkoberman@gmail.com> > wrote: > > There are several different USB serial drivers. Off-hand I see > > ubser, ubsa, > > uchcom, ucom, ucycom, uftdi, ubgensa, umcs, umct, umoscom, uplcom, > > usb_serial, uslcom, and uvscom. Whether any of these will support > > the TI > > chip, I can't say. Most have man pages, but a few, as has been > > noted, are > > lacking one. > > I tried to automate discovery of these things. However, the only way > you can really know for sure about the TI chip is to read it's > datasheet > and compare that with extant drivers. It's actually easier than it > sounds. > > I've often thought of unification of the TTY USB drivers, since they > are > most (but not all) based on the standard plus extra bits. > > Warner To reiterate: we do not have a driver for TI 5052 chips. It's not much like other usb-serial chips. In fact it's not strictly a usb-serial chip, it's a multifunction chip that includes a software -controllable usb hub, 2 serial ports, gpio, an i2c bus master, an MCU interface, a multichannel DMA controller, and apparently even has the ability to download your own 8052-compatible microcontroller code into the 5052 and have it take over from the built-in rom code. It would be reasonable enough to write a driver that initially supported only the uart part of the chip. -- Ian
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