From: Mauro Carvalho Chehab <mchehab@infradead.org>
To: "Paweł Kuźniar" <pawel@kuzniar.com.pl>
Cc: linux-media@vger.kernel.org
Subject: Re: Videomed Videosmart VX-3001
Date: Mon, 20 Sep 2010 13:35:33 -0300 [thread overview]
Message-ID: <4C978D55.9000901@infradead.org> (raw)
In-Reply-To: <AANLkTinxtii3nA1=16RJsi6OM1AyFAbH5rEpD6jw6dR6@mail.gmail.com>
Em 20-09-2010 10:15, Paweł Kuźniar escreveu:
>> This patch should reduce the bus speed to 25 kHz, hopefully giving us more information
>> about your device.
>>
> Here are logs with patched driver:
>
> [115345.416343] usbcore: registered new interface driver em28xx
> [115345.416350] em28xx driver loaded
> [115397.552829] usb 1-3: new high speed USB device using ehci_hcd and address 21
> [115397.704422] em28xx: New device @ 480 Mbps (eb1a:2861, interface 0, class 0)
> [115397.704488] em28xx #0: chip ID is em2860
> [115397.874880] em28xx #0: i2c eeprom 00: 00 00 00 00 00 00 00 00 00
Same issue... it is returning zero for all I2C reads...
Oh well... We'll need to go to the hard way.
Please install usbsnoop and capture the data exchange for the usb device eb1a:2861.
The log will contain all init sequence used by the driver. There's probably an
gpio init sequence that is needed, in order to access the I2C bus on that device.
There are some instructions about that at:
http://linuxtv.org/wiki/index.php/Bus_snooping/sniffing
Cheers,
Mauro
prev parent reply other threads:[~2010-09-20 16:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 16:19 Videomed Videosmart VX-3001 Paweł Kuźniar
2010-09-14 22:11 ` Mauro Carvalho Chehab
2010-09-20 13:15 ` Paweł Kuźniar
2010-09-20 16:35 ` Mauro Carvalho Chehab [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4C978D55.9000901@infradead.org \
--to=mchehab@infradead.org \
--cc=linux-media@vger.kernel.org \
--cc=pawel@kuzniar.com.pl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.