lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 17 Feb 2020 15:32:55 +0000
From:   Vitor Soares <>
To:     Boris Brezillon <>
CC:     "" <>,
        "" <>,
        Jose Abreu <>,
        Joao Pinto <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>
Subject: RE: [RFC v2 0/4] Introduce i3c device userspace interface

Hi Boris,

From: Boris Brezillon <>
Date: Mon, Feb 17, 2020 at 14:51:41

> Hello Vitor,
> Sorry for taking so long to reply, and thanks for working on that topic.
> On Wed, 29 Jan 2020 13:17:31 +0100
> Vitor Soares <> wrote:
> > For today there is no way to use i3c devices from user space and
> > the introduction of such API will help developers during the i3c device
> > or i3c host controllers development.
> > 
> > The i3cdev module is highly based on i2c-dev and yet I tried to address
> > the concerns raised in [1].
> > 
> > NOTES:
> > - The i3cdev dynamically request an unused major number.
> > 
> > - The i3c devices are dynamically exposed/removed from dev/ folder based
> >   on if they have a device driver bound to it.
> May I ask why you need to automatically bind devices to the i3cdev
> driver when they don't have a driver matching the device id
> loaded/compiled-in? If we get the i3c subsystem to generate proper
> uevents we should be able to load the i3cdev module and bind the device
> to this driver using a udev rule.

My idea was to expose every device to user-space by default so we can 
test them without a driver (more or less the i2c use case) but as we 
agreed during the i3c subsystem only expose devices that doesn't have 
device driver.
I considered to have a uevent but to expose the devices by default it 
would required something generic, what I didn't figure out and tend to 
follow the i2c-dev module.

With this current approach even if a device has a driver we can unbind it 
through the Sysfs and have access from user space which I found useful 
for debug.

> Regards,
> Boris

Powered by blists - more mailing lists