Re: How can I use two command bytes for a block read?

[Wayne Tams <wayne.tams@xxxxxxxxx>]

Oops apologies, though your advice helped, problem solved.

Thanks

Wayne

On Fri, Aug 12, 2011 at 3:29 PM, Guenter Roeck <guenter.roeck@xxxxxxxxxxxx> wrote:

On Fri, Aug 12, 2011 at 05:21:15AM -0400, Wayne Tams wrote:
> Hi,
>
> I am having a little bother interfacing with a device that requires two command
> bytes for both reads and writes. I can perform a successful write using I2C
> writes but I would rather use the user-space i2c_smbus_ functions from
> i2c-dev.h. In the i2c-dev documentation (http://lxr.free-electrons.com/source/
> Documentation/i2c/smbus-protocol?v=2.6.35;a=arm#L225) there is a mention of a
> two byte command block read but there does not appear to be any supporting
> function in i2c-dev.h. Is there a patch available to add this functionality or
> could there be another approach?
>
> Just to clarify I need my smbus read transaction to look like this:
>
>
>
>  S Addr Wr [A] Comm1 [A] Comm2 [A] S Addr Rd [A] [Data] A [Data] A ... A [Data] NA P
>
> Thanks
>
> Wayne

Wrong mailing list. Try linux-i2c@xxxxxxxxxxxxxxx (copied).

As a general hint, eeprom drivers such as drivers/misc/eeprom/at24.c do this;
you might want to have a look.

Guenter

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