linux-kernel - Re: [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga

lists.openwall.net		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 linux-cve-announce 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]

Message-ID: <4661d2f3-13e1-ff62-22e1-e4391ccc38b2@enpas.org>
Date:   Thu, 15 Aug 2019 14:10:56 +0200
From:   Max Staudt <max@...as.org>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, linux-m68k@...r.kernel.org,
        linux-kernel@...r.kernel.org, glaubitz@...sik.fu-berlin.de
Subject: Re: [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga

On 08/15/2019 02:04 PM, Wolfram Sang wrote:
>>   When the PCF8584 is addressed as slave, this register
>>   must be loaded with the 7-bit I 2 C-bus address to which the
>>   PCF8584 is to respond. During initialization, the own
>>   address register S0' must be written to, regardless
>>   whether it is later used.
> 
> I see. It must be written a non-zero value to leave the monitor mode.
> But this really needs no callback, we can hardcode any non-zero value.
> If slave support is (ever) to be implemented, the own address will come
> from the I2C core.
The callback, just like getclock(), is from the existing i2c-algo-pcf, which I don't want to touch right now. So I'm afraid it has to stay, even if it returns a fixed number.

Touching or forking i2c-algo-pcf will be necessary in order to implement IRQ support, if I ever get around to it. I've wasted too much time on debugging IRQ support, and would rather do it another time, if ever ;)
I've left a comment block at the start of i2c-icy.c for anyone interested in the gory details.


If this is okay with you, I'll send another round of patches. :)


Thanks!

Max