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From: Oliver Neukum <>
To: Greg KH <>, Patong Yang <>
Subject: Driver for MaxLinear/Exar USB (UART) Serial adapters.
Date: Thu, 05 Apr 2018 09:38:34 +0200	[thread overview]
Message-ID: <> (raw)

Am Donnerstag, den 05.04.2018, 08:26 +0200 schrieb Greg KH:
> > The USB device can describe itself properly.  The SMBIOS function is a
> > requirement from our customer who designed a board using our device where
> > their CPU reads from a specific BIOS location and initializes GPIOs based
> > on the settings.  These GPIOs set the mode of the transceiver (LOOPBACK,
> > RS232, RS485, or RS422).  Therefore, the driver also reads the same
> > settings from the BIOS, so that it can enable the appropriate mode.
> That logic can be done in userspace, no need to do that within the
> kernel, right?

No, not if you want to do full RS485 and similar stuff.

Yet ACM is not a full serial interface. It is for modems.
That raises two questions

a) why not add this to cdc-acm?
b) why custom ioctls? The kernel can do those serial protocols at upper

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             reply	other threads:[~2018-04-05  7:38 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-05  7:38 Oliver Neukum [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-08-16 10:05 Driver for MaxLinear/Exar USB (UART) Serial Adapters Greg Kroah-Hartman
2018-08-16  8:28 Patong Yang
2018-08-16  8:26 Oliver Neukum
2018-08-16  6:34 Greg Kroah-Hartman
2018-08-16  5:56 Patong Yang
2018-07-26 10:57 Greg Kroah-Hartman
2018-07-25  7:38 Oliver Neukum
2018-07-24 22:36 Patong Yang
2018-04-06 14:45 Driver for MaxLinear/Exar USB (UART) Serial adapters Greg Kroah-Hartman
2018-04-05  6:26 Greg Kroah-Hartman
2018-04-04  8:00 Greg Kroah-Hartman
2018-04-04  7:59 Greg Kroah-Hartman
2018-04-04  7:38 Oliver Neukum
2018-04-04  7:06 Patong Yang

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